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Injection Mold

Injection Mold

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In modern industrial production, mold is an important technology used in shaping products (including metal products and nonmetal products) for all of the industries. Meanwhile, it is the ‘magnifying glass of efficiency and profit’ to the raw material and equipment, because the value of the final product made in the mold is often tens of, even hundreds of times as valuable as that of the mold itself.

The mold industry is the basic industry of the national economy, and it is called ‘the mother of industry’. Every aspect of human life such as clothes, food, housing, and transportation is closely connected with the mold industry. Therefore, the level of injection mold technology has been a significant symbol to measure a country’s developing level of mechanical industry.

And mold can be divided into two kinds of them: mold for metal products and nonmetal products.
The metal products mold include cold-press mold, pressing mold, forging mold, press casting mold, precise casting mold, stamping tool, punch tool, and dust metallurgy mold, etc. These kinds of mold have extensive apply-cation in electrode-cranial products, automobiles, aviation instruments, and other metal products.
The nonmetal products include plastic injection mold, ceramic mold, rubber mold, glass mold, food mold, and ornament mold. These kinds of molds have extensive apply cation in our lives, at this page we are talking about injection mold. this is the most papular modern technology which used in our life everywhere.

An injection mold used to form a plastic product using the injection molding process. A standard injection mould is made of a stationary or injection side containing one or more cavities and a moving or ejection side.

The resin, or raw material for injection moulding, is usually in pellet form and is melted by heat and shearing forces shortly before being injected into the mould. The channels through which the plastic flows toward the chamber will also solidify, forming an attached frame. This frame is composed of the sprue, which is the main channel from the reservoir of molten resin, parallel with the direction of the nozzle, and runners, which are perpendicular to the direction of the nozzle and are used to convey molten resin to the gate(s), or point(s) of the gate and feeding the molten material into the mold cavity. The sprue and runner system can be cut off and recycled after molding. Some moulds are designed such that it is automatically stripped from the part through the action of the mould. For example, the submarine gate or banana gate, if using hot runner systems then there will be no runners.

The quality of the injection molded part depends on the quality of the mould, the care taken during the moulding process, and upon details of the design of the part itself. It is essential that the molten resin is at just the right pressure and temperature so that it flows easily to all parts of the mold. The parts of the injection mold must also come together extremely precisely, otherwise small leakages of molten plastic can form, a phenomenon known as flash. When filling a new or unfamiliar mould for the first time, where shot size for that particular mould is unknown, a technician should reduce the nozzle pressure so that the mold fills, but does not flash. Then, using that now-known shot volume, pressure can be raised without fear of damaging the mould. Sometimes factors such as venting, temperature, and resin moisture content, can affect the formation of flash as well.

Injection Mold Material

Traditionally, molds have been very expensive to manufacture therefore they were usually only used in mass production where thousands of parts are being produced. Injection Molds are typically constructed from hardened steel or aluminum. The choice of material to build a mold is primarily one of economics. Steel molds generally cost more to construct, but their longer lifespan will offset the higher initial cost over a higher number of parts made in the mold before wearing out. Aluminum molds can cost substantially less, and when designed and machined with modern computerized equipment, can be economical for moulding hundreds or even tens of parts.

Requirements for the injection mold

ejection system

An ejection system is needed to eject the molded part from the cavity at the end of the molding cycle. Ejector pins built into the moving half of the mold usually accomplish this function. The cavity is divided between the two mold halves in such a way that the natural shrinkage of the molding causes the part to stick to the moving half. When the mold opens, the ejector pins push the part out of the mold cavity.

cooling system

A cooling system is required for the mold. This consists of an external pump connected to passageways in the mold, through which water is circulated to remove heat from the hot plastic. Air must be evacuated from the mold cavity as the polymer rushes in. Much of the air passes through the small ejector pin clearances in the mold. In addition, narrow air vents are often machined into the parting surface; only about 0.03 mm (0.001 in.) deep and 12 to 25 mm (0.5 to 1.0 in.) wide, these channels permit air to escape to the outside but are too small for the viscous polymer melt to flow through.

All of the information we referred from Wikipedia, but we sort out together for easy to read, if you want to know more, please go to injection mold Wikipedia.

 

Insulated Runner Mold

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Flexible Gating Advantages, Dependable Reproduction, Economical Process, Easy to Maintain, Fast Molding Cycle, Decreased Tool Wear

SINCERE TECH is mold manufacturer china company that provides plastic mold making and plastic injection molding solutions to industries of the world, started since 2005 we specially make plastic molds for the customer, after 2016 we have bought a plastic injection molding company to mold the molded part for our world customers.

Our advanced manufacturing facilities include a wide range of thermoplastic injection molding solutions for many types of plastic parts, including processes for Hot Runner mold Systems and Cold Runner mold Systems.

Insulated Runner Molds: Hot Runner System With A Twist

Insulated runner systems are inexpensive alternatives to traditional hot runners, where the mold is not heated, but the runner channels are extremely thick and stay molten during continuous cycling.

This feature provides the flexible gating advantages of hot runner switch out the added cost of the manifold and drops of a heated hot runner system.

Properly designed insulated runners, with thermally controlled gate, offer several advantages over hot runner mold systems, including:

  • Dependable reproduction – no “dead spots” in mold
  • Uniform temperature distribution – thermal insulation forms through melt deposited at the wall
  • Economical process for continuous operation of uniform cycles without extended interruptions
  • Easy to maintain – quick to clean
  • Fast production color changes
  • Molds are less expensive to build and to maintain than hot runners
  • Minimal heat loss – thermal equilibrium reached quickly
  • Low energy input on startup – reduces energy cost
  • More consistent volume of polymer per part
  • Faster molding cycles
  • Elimination of runner scrap — less regrind

    Mold manufacturer China

    Mold manufacturer China

  • Improved part finish
  • Decreased tool wear

However, as with hot runners, the insulated runner system also has disadvantages when compared to cold runner systems. The increased level of technology required to manufacture and operate the mold results in:

  • More complicated mold design
  • Higher mold costs
  • More difficult start-up procedures
  • Possible thermal degradation of the polymer melt
  • More difficult color changes than with cold runners

For a quote or more information about how we can help your project, please call us or send us an email, we will quote you in 24 hours.

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Molding Flash or burrs

Cold Runner Mold

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Cold Runner Mold: Plastic Injection Molding, Simple Part Design, Limited Production Runs, Low Maintenance, Change Production Color, Low-Cost Mold

What is cold runner mold

A cold runner mold is a type of injection molding tool where the plastic material is cooled in a separate channel or “runner” before it reaches the individual cavities of the mold. The plastic resin is injected into the cold runner system, where it solidifies before being directed into the cavities to form the final parts. The term “cold” refers to the fact that the runner system is not heated, unlike a “hot runner” mold. Cold runner molds are often used for producing large numbers of small, simple parts and are relatively low-cost to produce.

SINCERE TECH (plasticmold.net) provides plastic injection mold solutions to industries of all types and sizes.

Our state-of-the-art mold building facilities include high-speed CNC Milling and mirror EDM Machining for many types of complex specialty injection molds, including insert molds, gas-assist injection molding, 2K mold, multiple cavities mold and unscrewing molds. We can build molds from small to big (25 ton) for both hot runner mold systems and cold runner mold systems.

Cold Runner Molds: Efficient and Economical

Here are some key characteristics and considerations of cold runner molds:

  1. Runner System: In a cold runner mold, the plastic material is injected into a runner system that distributes the molten plastic to multiple mold cavities. The runner system is typically designed to be easily removed from the finished part, but it generates waste material (the runners) that needs to be recycled or disposed of.
  2. Simplicity: Cold runner molds are simpler and less expensive than hot runner molds because they do not require the complex heating and control systems associated with hot runners.
  3. Material Waste: The main drawback of cold runner molds is the generation of material waste. The runners are typically discarded or recycled, which can add to material costs.
  4. Cycle Time: Cold runner molds may have slightly longer cycle times compared to hot runner molds because the plastic in the runners must cool and solidify before the parts can be ejected.
  5. Part Quality: The simplicity of cold runner molds can make them a good choice for parts with relatively simple geometries. However, in some cases, cold runners can cause aesthetic defects like visible weld lines on the finished parts.
  6. Heat-sensitive Materials: Cold runner molds are suitable for a wide range of plastics but may be less suitable for heat-sensitive materials that can degrade during the cooling process.
  7. Maintenance: Maintenance and cleaning of cold runner systems are generally easier compared to hot runners because there are no heated components to deal with.

Ultimately, the choice between cold runner and hot runner molds depends on the specific requirements of the molding project, such as part complexity, material selection, production volume, and cost considerations. Cold runner molds are commonly used in many applications, particularly when cost and simplicity are important factors.

Choosing the correct system depends on the requirements of the part to be produced. A few of the considerations include:Cold runner mold

  • Part complexity
  • Color requirements
  • Physical characteristics of the material
  • Type of material – virgin or “regrind”
  • Color changes during the production run

Cold runner systems are best used:

  • When the parts produced are of simple design,
  • For limited production runs, or
  • When a rapid change in production colour is needed

In a cold runner mold, the runner (excess material retained in the feed channels) is cooled and ejected with the part. Every cycle, apart, and a runner is produced.

There are two major types of cold runner molds:

  • A two-plate cold runner mold is the easiest and least expensive type of mold to produce. Two plate molds have a single parting plane, and the mold splits into two halves at the plane. Because the runner system must be in line with the parting plane, the part can only be gated on its perimeter.
  • A three-plate cold runner mold differs from a two plate in that it has two parting planes, and the mold splits into three sections every time the part is ejected. This feature provides greater flexibility of design, allowing gating to be placed in the most efficient locations. Since the mold has two parting planes, the runner system can be located on one, and the part on the other, for easier separation.

Cold Runner Mold Systems: The advantages & disadvantages

There are many significant advantages to using a cold runner mold system:

  • Simple, lower-cost mold design and construction
  • Considerably less expensive than a hot runner system
  • Moulds require less maintenance
  • Easier to set up and operate
  • Colour changes are easy – all plastic in the mould is ejected with each cycle

While it is a less expensive process that hot runner systems, there are a few disadvantages to cold runner systems that need to be considered, including:

  • Waste plastic generated
  • Runner material must be either disposed of or
    reground and reprocessed
  • Additional steps in the manufacturing process
  • Regrind will increase variations in the injection 
    molding process
  • Regrinding could decrease the plastic’s strength characteristics and mechanical properties

At Sincere Tech China mold maker, our unwavering commitment to staying at the forefront of the plastic mold industry drives us to embrace advancements and anticipate future trends. We continuously explore innovative materials and composites that offer enhanced performance and promote sustainability. By investing in ongoing research and development, we consistently deliver cutting-edge solutions that meet the evolving needs of our valued customers. As a trusted injection mold supplier in China, we take pride in our unwavering dedication to excellence.

Aligned with our sustainability goals, we place a high priority on environmentally friendly practices. We actively seek out sustainable alternatives, such as biodegradable polymers, and implement recycling initiatives to minimize the environmental impact of our manufacturing processes. By choosing our custom injection molding services, you can align your brand with sustainable manufacturing practices and contribute to a greener future.

Ensuring quality is our topmost priority, and we maintain rigorous quality control measures throughout the entire manufacturing process. Equipped with state-of-the-art facilities and staffed by skilled technicians, we subject each product to thorough inspection and testing. This guarantees exceptional performance, reliability, and customer satisfaction.

When you choose Sincere Tech as your preferred plastic mold maker in China, you can expect the highest level of professionalism, expertise, and innovation. Our dedicated team is committed to helping you bring your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Partner with Sincere Tech today and experience our relentless pursuit of excellence, as we work together to bring your vision to reality.

Our expanded capabilities include:

  1. Rapid Prototyping: We offer rapid prototyping services to quickly transform your concepts into tangible prototypes, allowing for iterative design improvements and accelerated product development.
  2. Precision Tooling: Our advanced tooling capabilities enable us to create high-quality molds with tight tolerances, ensuring consistency and precision in your injection-molded products.
  3. Overmolding: We specialize in overmolding, which allows for the combination of multiple materials or components, resulting in enhanced functionality, aesthetics, and durability.
  4. Insert Molding: Our expertise in insert molding enables us to securely encapsulate inserts within the molded parts, facilitating efficient assembly and enhancing product performance.
  5. Two-Shot Molding: With two-shot molding, we can produce complex, multi-material components in a single operation, reducing assembly requirements and enhancing design possibilities.
  6. Value-Added Services: In addition to injection molding, we offer a range of value-added services, including product assembly, packaging, and logistics support, streamlining your supply chain and reducing costs.

Partner with Sincere Tech Mould suppliers for your custom injection molding needs, and benefit from our comprehensive capabilities, unwavering commitment to quality and sustainability, and our drive to exceed your expectations at every step of the process. Together, let’s bring your innovative ideas to life.

hot runner with manifold

Hot Runner Molding

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What is hot runner mold

A hot runner mold is a type of injection molding system that uses heated material feed channels, or “hot runners,” to maintain the temperature of the plastics as it flows through the injection mold. This allows for a more consistent and efficient molding process, as the plastic does not have to be reheated between shots so the cycle time will be reduced and will save the waste runner materials ( sometimes has no any runner with hot runner systems). Hot runner systems are commonly used in the production of large quantities of plastic parts, such as in the automotive and consumer goods industries, or used in the stack mold.

DONGGUAN SINCERE TECH CO.LTD(SINCERE TECH) provides plastic injection mould solutions to industries of all types and sizes. For almost 20 years DST has designed, built, and worked on almost every type of mold existing in the plastic industry.

We are experienced in building custom plastic molds for a variety of hot runner mold systems, from hot runner manufacturers like:

  • Husky hot runner systems
  • Synventive hot runner systems
  • Kona hot runner systems
  • DME hot runner systems
  • Mold-Masters hot runner systems
  • INCOE hot runner systems
  • HOSCO hot runner systems

Our state-of-the-art mold building facilities include High precision CNC machines, automatic CMM measurement machine, and Two heads of EDM Machines to create many types of custom molds, including complex specialty injection molds, insert molds, unscrewing molds, overmolding, hot runner mold, cold runner mold, stack mold, gas-assisted injection molds, double injection molds (2k molding), etc. We can build molds for both cold runner systems and hot runner systems.

Hot Runner Molding: Efficient High Production

Here are some key characteristics and advantages of hot runner molds:

  1. Runner System: In a hot runner mold, the runner channels are heated, allowing the molten plastic to flow freely from the injection unit to the mold cavities without solidifying. This eliminates the need for a separate runner system, which is typically discarded or recycled in cold runner systems.
  2. Material Efficiency: Hot runner molds are more material-efficient because there is no waste generated from runners. This can result in cost savings for materials, especially for high-volume production.
  3. Reduced Cycle Time: Hot runner molds often have shorter cycle times compared to cold runner molds because there is no need for the plastic to cool and solidify in the runner channels.
  4. Improved Part Quality: Hot runner systems can help produce high-quality plastic parts with minimal defects, such as weld lines, since the plastic enters the cavities in a fully molten state.
  5. Complex Geometries: Hot runner molds are well-suited for parts with complex and intricate geometries, as they allow precise control over the flow of molten plastic to different areas of the mold.
  6. Material Compatibility: Hot runner systems are compatible with a wide range of plastic materials, including heat-sensitive polymers that may not be suitable for cold runner molds.
  7. Temperature Control: Hot runner systems require more sophisticated temperature control systems to maintain the desired temperature in the runner channels and nozzles, which can add complexity and cost to the mold design.
  8. Maintenance: Maintenance of hot runner systems can be more complex than that of cold runners due to the presence of heated components.

Hot runner molds are commonly used in industries where high precision, minimal material waste, and fast production are critical, such as automotive, medical, and consumer goods manufacturing. The choice between hot runner and cold runner molds depends on the specific requirements of the molding project, production volume, part complexity, and material selection.

Choosing the system to employ depends on the requirements of the part to be produced. A few of the considerations include:

Hot runner mold structure

Hot runner mold structure

  • Type of material to use – virgin or “regrind”
  • Colour changes during the production run
  • Single or multiple design production
  • Part complexity
  • Colour requirements
  • Physical characteristics of the material

The primary difference between the two systems is that the hot runner eliminates the excess material retained in the feed channels of a cold runner mold. This feature reduces the number of production steps required and saves in material and energy costs.

Furthermore, mostly hot runners use 100% virgin resins; no reprocessed or “re-grind” material is added. This is an important feature for specific applications where regrinding can cause the material to yellow, or detracts from the material properties, such as clarity in light pipe or lens production, where long-lasting transparency is a specific requirement.

Hot runner molding systems normally inject melted material directly into the individual mold cavity. Hot runner is almost always used for large volume production of thermoplastic injection molded parts, or multiple part production using multi-cavity molds and stack-molding technology.

Hot runner molds are two plate molds with a heated runner system inside one half of the mold. A hot runner system is divided into two parts:

  • The manifold has channels that convey the plastic on a single plane, parallel to the parting line, to a point above the cavity
  • The drops, situated perpendicular to the manifold, convey the plastic from the manifold to the part

Hot-Runner Systems: The advantages and disadvantages

Primary advantages of hot runner systems include:

  • Shorter, faster cycle times – most of them have no runners to cool
  • Smaller machines – reduced shot volume into runners
  • Automated processing – runners do not need to be separated from the parts
  • Gates at the best position for economical design
  • Elimination of runners means
  • Materials cost savings – no runner to regrind or reprocess
  • Least expensive cost/piece
  • Reduction of energy costs
  • No runners to remove or regrind
  • Reduces the possibility of contamination
  • Lower injection pressures
  • Lower clamping pressure
  • Consistent heat within the cavity
  • Shorter cooling time
  • Shot size reduced
  • Cleaner molding process
  • Eliminates nozzle freeze

There are, however, a few disadvantages to hot runner mold systems that need to be considered:

  • Hot runner molds are more complex and expensive to build than cold runner molds
  • Higher initial start-up costs than for cold runner systems
  • Complex initial setup prior to running the mold
  • Higher maintenance costs – more susceptible to:
    • Breakdowns
    • Leakage
    • Heating element failure
    • Wear caused by filled materials
  • Risk of thermal damage to sensitive materials
  • Elaborate temperature control required
  • The colors change is more complex than the cold runner, sometime you will spend lots of time and cost to clean up the hot runner systems, especially for transparency and white color parts.

Hot Runner Molds: Applications & Possibilities

Hot-runner systems are almost always used when large runs have to be manufactured in highly automated production. Additionally, technological advances enable us to build molds with gates positioned to yield the best quality molded parts.

Hot runner molds are sometimes connected to needle valve nozzles, which are activated with precise computer-controlled timing. This allows for a number of advanced processes, including:

  • In-Mold Decoration – lamination with a colored film coating
  • Multi-Cavity Molds – cavities with different geometries and/or volumes
    • Parts that belong together produced in one mold
    • Injection valve opening and closing can be adjusted to the conditions of each individual cavity
    • Injection pressure and holding pressure may be adjusted  independently of each other
  • Controlled Volume Balancing – a weld line can be shifted into a non-critical area of the molded part
  • Stack Molding – two or more mold bases in production simultaneously creating multiple parting lines

At Sincere Tech China mold maker, our unwavering commitment to staying at the forefront of the plastic mold industry drives us to embrace advancements and anticipate future trends. We continuously explore innovative materials and composites that offer enhanced performance and promote sustainability. By investing in ongoing research and development, we consistently deliver cutting-edge solutions that meet the evolving needs of our valued customers. As a trusted injection mold supplier in China, we take pride in our unwavering dedication to excellence.

Aligned with our sustainability goals, we place a high priority on environmentally friendly practices. We actively seek out sustainable alternatives, such as biodegradable polymers, and implement recycling initiatives to minimize the environmental impact of our manufacturing processes. By choosing our custom injection molding services, you can align your brand with sustainable manufacturing practices and contribute to a greener future.

Ensuring quality is our topmost priority, and we maintain rigorous quality control measures throughout the entire manufacturing process. Equipped with state-of-the-art facilities and staffed by skilled technicians, we subject each product to thorough inspection and testing. This guarantees exceptional performance, reliability, and customer satisfaction.

When you choose Sincere Tech as your preferred plastic mold maker in China, you can expect the highest level of professionalism, expertise, and innovation. Our dedicated team is committed to helping you bring your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Partner with Sincere Tech today and experience our relentless pursuit of excellence, as we work together to bring your vision to reality.

Our expanded capabilities include:

  1. Rapid Prototyping: We offer rapid prototyping services to quickly transform your concepts into tangible prototypes, allowing for iterative design improvements and accelerated product development.
  2. Precision Tooling: Our advanced tooling capabilities enable us to create high-quality molds with tight tolerances, ensuring consistency and precision in your injection-molded products.
  3. Overmolding: We specialize in overmolding, which allows for the combination of multiple materials or components, resulting in enhanced functionality, aesthetics, and durability.
  4. Insert Molding: Our expertise in insert molding enables us to securely encapsulate inserts within the molded parts, facilitating efficient assembly and enhancing product performance.
  5. Two-Shot Molding: With two-shot molding, we can produce complex, multi-material components in a single operation, reducing assembly requirements and enhancing design possibilities.
  6. Value-Added Services: In addition to injection molding, we offer a range of value-added services, including product assembly, packaging, and logistics support, streamlining your supply chain and reducing costs.

Partner with Sincere Tech Mould suppliers for your custom injection molding needs, and benefit from our comprehensive capabilities, unwavering commitment to quality and sustainability, and our drive to exceed your expectations at every step of the process. Together, let’s bring your innovative ideas to life.

Plastic Mold and Mold Maintenance

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You need to know how to fix the mold issue, plastic Mold Maintenance, repair the plastic mold, if you are working in plastic injection mould, mold Maintenance in important.

Mould, indispensable in modern industry development and technological level improvement, is one kind of widely-used process equipment during mid-period of industrial production. According to statistics, moulding accounts for 75% of rough machining of industrial parts and 50% of precision machining. Mould can be classified as cold-punching mold, injection mold (or plastic injection mold), die casting mold, rubber mold and so on.plastic mold

1. Introduction of Injection Mould

1.1 Range of Application:

Injection mould is suitable for thermoplastic like ABS, PP, PC, POM, etc. while rubber mould is fit for thermosetting plastic, such as phenolic plastic, epoxy plastic and so on.

1.1.1 Classification of Injection Mould:

By structure: two-plate mould, three-plate mould

By gate type: edge gate mould, pin gate mould, hot runner mold

1.1.2 Structure of Injection Mould

A. Molding parts/components: normally called as cavity and core, which are the closest part with plastic products.

B. Feeding/casting system: Runner for molten plastic to flow from nozzle to cavity. It is classified as the main runner, sub-runner, runner gate, cold slag well, etc.

C. Leading/Guiding system: The system, determining the relative position of cavity and core during clamping/mold closing, is normally made up by guide pin and guide bushing. the ejector plates also need positioning by guide pin and guide bushing.

D. Demoulding structure: It is the structure ejecting the plastic part from the mold. Commonly, it consists of ejector pin, ejector plate/stripper plate, ejector sleeve, etc.

E. Temperature conditioning system: Cooling water must installed at both cavity and core site to meet the requirement of mold temperature during the injection molding process.

F. Side parting line and side action: Slide should be adopted when there is under-cut structure on the product design, i.e. the structure inconsonant with demoulding direction. It is usually made up by slide, lifter, loose core, etc.

G. Venting system: It consists of two forms: the venting groove and gap between mould components. In order to discharge air in cavity and gas caused in moulding process, venting groove is usually set at parting line, with the principle of designing venting groove as big as possible in compliance with smooth overflow and flashing. Meanwhile, insert pin, ejector pin and mould insert discharge air through gaps between mold components.

2. Plastic Mould Repair

Mould repair is needed during occasions of normal or abnormal abrasion and various abnormal phenomena occurred during plastic molding production.

2.1 Preparations for moldmaster (moldmaker)

A. Make it clear the mould is damaged to what extent;

B. Develop a repair plan according to the damaged molding sample.

C. Precise understanding for repair work needed to be done: Mould repair is usually carried out without drawing with the principle of no change of the plastic parts structure and dimension. Therefore, it is prerequisite for our technician to understand precisely where and to what size should the part be repaired.

2.2 The Dos and Donts during assembly and Disassembly Mould

A. Sign mark: The corresponding sign mark in mould base must be remembered clearly when removing guide pin, ejector sleeve, ejector pin, mould insert, holder block, etc, to assure the right re-installation for the mould, especially for those with direction requirements. The following two items should be paid attention to in this process:

  • The signed mark is the exclusive one without duplication;
  • Sign mark should be made on each mould insert accordingly

B. Anti-Damage proofing: Anti-Damage proofing should be carried out for parts easy to install. In other words, parts cannot be installed back with Incorrect installation;

C. Placement: Parts removed should be placed in order while screws, springs, O-ring should be stored in the plastic box.

D. Protection: Protection measures should be made for precision parts such as mould core, cavity and so on, to avoid careless damage by people.

2.3 The Dos and Donts when Repairing Mould texture surface

A. Polishing: Protection measures for texture surface component should be made prior to repair work when polishing is needed for plastic parts with mould sticking and scrapes. It is forbidden to polish texture surface area. Mould shutoff repair should be done if it is unsure for the repair result.

B. Welding line: The following items should be paid attention to during welding on texture surface:

  • Welding rod material should be consistent with that of mould core;
  • Tempering should be done after welding;

C. Re-texture: When mould repair is finished and ready to take it out for re-texture, moldmaker should make good protection of texture area covered with paper, mark position to make texture area and attach texture template with the mould. After mould texturing, moldmaker should examine textured surface carefully to guarantee good quality and then install mould back.

If it is not sure about the repairing result, mold test should be made first. If it is OK, then take mould out to make the textureplastic mold maintenance

3. Plastic Mold Maintenance

Plastic Mold maintenance is more important than mould repair. The more frequently repaired, the shorter the molds life would last. And vice versa.

3.1 The necessity for Mould Maintenance

  • Keep normal movement of the mould and avoid unnecessary abrasion of moving parts;
  • Maintain the mould to normal service lifetime;
  • Reduce oil contamination during production.

3.2 Classification of Mould Maintenance

  • Routine maintenance for the mould;
  • Scheduled maintenance for the mould;
  • Appearance maintenance for the mould.

3.3 Items for Plastic Mould Maintenance

a. Routine maintenance:

  • Oil filling on moving parts like ejector pin, slide, leader pin and ejector sleeve;
  • Mould surface cleaning;
  • Cooling channel dredging;

b. Scheduled maintenance, following the above items;

  • Venting slot cleaning. Add venting slot at air trapping places and position burnt mark area;
  • Repair of damaged and wearing places;

c. Appearance maintenance:

  • Make painting for outside of mould base to avoid rusting;
  • The cavity should be coated with anti-rusting oil/grease after mould dropping/shutoff.
  • Mould should be closed tightly for storage to avoid dust coming into mould core.

3.4 The Dos and Donts for Mould Maintenance

a. For moving parts, oil filling during routine maintenance is necessary;

b. Mould surface must be clean enough: Tag paper cannot be stuck on P/L side. Do not close the mold when molding part is sticking to the cavity or core side, clean the plastic residues at P/L position.

c. Abnormal condition identification, Prompt repair should be made if there is ejection abnormity, great noise during mold-opening and mold-closing.

4. Safety Issues during Mould Repair and Maintenance

Safety should be put in the first place whenever and wherever. Mould repair and maintenance, with close contact with mold machine and steel equipment, is no exception. It is necessary to pay high attention to safety issues during this process.

  • Examine carefully before use to make the sure hanging ring in perfect condition.
  • The worker must wear safety goggle when operating mold machine to avoid flying chip into eyes
  • The worker must wear protective clothing and safety goggle during the welding process.
  • It is forbidden to operate at the bottom of the mould.
  • Injection moulding machine must be in stopped state and nameplate should be hung on it before operating machine.
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How To Save Injection Molding Cost By Multiple Cavity Mold

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How To Save Injection Molding Cost By Multiple Cavity Mold

When you have a project then you may need plastic injection molded parts, the first thing you need to do is finding a plastic mold company to make mold & molded parts, but before start this I think you need to check injection molding cost and mold cost in advance for investment budget, multi cavity injection molding will be one of the best way to save unit production cost.

Like other things, there is no one solution that suitable for all of projects, below are some suggestions on how to save injection molding cost, there have both advantages and disadvantages, by reading this you could choose the one base on your project requirement.

What is multi cavity injection molding

Multi-cavity injection molding is typically used when high volume production of identical parts is needed. It allows for the efficient production of multiple parts in a single cycle, which can significantly increase production rates and reduce the cost per part. Additionally, using a multi-cavity mold can also help to reduce the overall cost of the mold itself.

Multiple cavity mold means the number of cavities greater than one, which means that has more than one part in an injection mold, It is usually professional to say cavity, One cavity or two cavities, for examples 8 cavities mold means one molding cycle to mold 8 parts with the 99% same part feature, dimension, shape, size, etc.

Some examples of products that may be produced using multi-cavity injection molding include automotive parts, electronic components, toys, and household items. It is also commonly used in the production of medical devices, personal care products and packaging.

24 multiple cavity mold

24 multiple cavity mold

When do we need Multiple Cavity Mold?

There are some factors to make decisions before starting to make your plastic mould.
1, the size of the product,
2, the number of the product requirement
3, the size of the machine, if you only buy plastic molded parts then you do not need to care about this point, you plastic molding supplier we check this.

If the size of the product is small, such as the computer keyboard button, usually make 24 or 48 Multiple Cavity Mold, you must say why not make 30 or 40, this is because for the balance mold layout and material filling balance, especially when you use cold runner mold. so normally multi-cavity mold is 4, 8, 16, 24, 48, 96 cavities are better options.

When we make multiple cavity mold and the cavities are more than 24, we normally suggest making hot runner mold, one part per hot-drop, at least to use 6 hot runners to the cold runner, which means four cavities per hot drop. this could save the cycle time and keeping the best quality of injection molding parts.

The advantages of Multiple Cavity Mold

The reason we make multi-cavity mold, the question is simple, we need to save production unit cost for each plastic molded parts, multi-cavity molds have several advantages over single-cavity molds in injection molding:

  1. Increased production efficiency: By producing multiple identical parts in a single cycle, Multiple Cavity Mold can significantly increase production rates and reduce the overall production time.
  2. Reduced cost per part: Multiple Cavity Mold can produce multiple identical parts at a lower cost per part than single-cavity molds.
  3. Reduced tooling costs: Since multi-cavity molds require only one tool, the overall cost of the mold is typically lower than that of multiple single-cavity molds.
  4. Better consistency: By producing multiple identical parts in a single cycle, multi-cavity molds can improve the consistency of the final product, reducing the need for rework or scrap.
  5. Reduced labor costs: Multi-cavity molds require less labor to operate than multiple single-cavity molds, as the operator only needs to monitor one machine.
  6. Reduced material consumption: By producing multiple parts in a single cycle, multi-cavity molds can also reduce the amount of raw material required to produce the final product.
  7. Improve part quality: Due to the consistency in the process and the precision of the machinery, multi-cavity molds can produce parts with tighter tolerances and better surface finish.

The disadvantages of multi cavity mold

We all know that all of the customers prefer the multiple cavity mould since this can save lots of production cost, but there are other factors you need to think about before making decision, because make plastic mold is not cheaper, make multi-cavity mould is more expensive than single cavity mold, some times double or even 3 times expensive than single cavity or two-cavity mold.

For example if you make 24 cavity mold, then you at least us 6 hot runner drops for the mold, the pure hot runner cost is around USD 5400 ( YUDO brand), if use China local brand of hot runner still need USD 3000, and this cost some times is enough to make 2 cavities cold runner mold, since there are many cavities in one mold, the mold manufacturing cost is high than the less cavity mold as well, this is another cost, so total cost is two or three times more is not surprised, below listed some disadvantages while use multi cavity mold:

  1. Higher initial cost: The initial cost of a multi-cavity mold can be higher than that of a single-cavity mold, especially for complex designs.
  2. Greater complexity: Multi-cavity molds are more complex than single-cavity molds and require more precise machining and design. This can lead to longer lead times for tooling and increased risk of defects.
  3. Higher maintenance costs: Due to the complexity of the mold and the increased number of moving parts, multi-cavity molds may require more maintenance and repairs than single-cavity molds.
  4. Greater risk of defects: With multiple cavities, the risk of defects is greater, as a problem in one cavity can affect multiple parts.
  5. Increased cycle time: Multi-cavity molds have longer cycle times than single-cavity molds as the machine has to fill multiple cavities at once.
  6. Greater potential for warpage: Multi-cavity molds have to be designed to account for the potential warpage that can occur during the cooling phase of the injection molding process.
  7. Increased risk of sink marks: As the material cools it will shrink, if the mold design is not optimized for multi-cavity, sink marks may appear on the surface of the parts.
  8. Increased risk of flash: Flash is the excess material that is extruded from the mold. Multi-cavity molds can be more prone to flash than single-cavity molds as the pressure and flow rate of the material is increased to fill multiple cavities.

When do you need multiple cavity mold

There is some simple suggestion when do you need to single cavity mold (may 2cavities at fist), when you should make the multi-cavity mold, like 8 cavity mold, 16 cavity mold or more. When you are sure that you will need the plastic parts more than one million or at least 0.5 million, then go to 8 or more mold cavities will surely save cost for you.

You may need to pay more cost on plastic mold manufacturing, but compare the production cost you are going to save, this injection mold cost is insignificant, because you will save 10 times more than this injection mold cost.

If you are not sure how many plastic moulding parts needed at the first, or this is depending on your business market sell, then we suggest use the 2 cavity mold at first, because this can save the plastic mold cost for you in advance, after you open your market, and the requirement of injection molded parts increased, you still can save injection molding cost by making new multiple cavity mold.

You use the existing mold to produce the parts at the same time and  make new multi-cavity mold, this will not have a delay as well, after the multiple cavity mold finished then you only need to run this multi-cavity mould, but if the quantity requirements are not so high, then you use the currently molds to produce, so you still have good profits with less investment (compare to make multi-cavity mold at first beginning).

When do you need single cavity mold

A single cavity mold is a type of mold used in the injection molding process. It consists of a single cavity or impression that forms the desired shape of the plastic part. This type of mold is used when the production volume is low or when the part design is complex and requires more attention to detail.

Advantages of using a single cavity mold include:

  1. Flexibility: Single cavity molds allow for more flexibility in terms of part design and material selection. Each cavity can be customized to meet specific requirements.
  2. Precision: With only one cavity to focus on, manufacturers can pay more attention to detail and ensure higher precision in the molding process. This is particularly important for intricate or complex part designs.
  3. Cost-effective for low volume production: Single cavity molds are cost-effective for low volume production runs. They have lower initial tooling costs compared to multi-cavity molds and are more suitable when the production quantity is small.
  4. Material compatibility: Single cavity molds are ideal when different materials or processes are required for each part. This allows for the production of diverse parts with varying material properties.

A single cavity mold is typically needed when you require a small quantity of parts or when the part design is complex and requires more time and precision to manufacture. It is also used when the part size is large and cannot be accommodated in a multi-cavity mold. Additionally, a single cavity mold may be preferred when the cost of manufacturing multiple cavities is not justifiable or when the part design requires different materials or processes for each cavity.

What do you think? by reading above I assume you have the idea on how to save injection molding cost for your project.

If you have any project in hands that need to make injection mold for your business, you are welcome to contact us, we will give you some good suggestions and ideas, to help you spend min investment on plastic mold cost and open your market rapidly.

At Sincere Tech, we are dedicated to maintaining our position as a leading plastic mold company by embracing industry advancements and anticipating future trends. We actively explore innovative materials and composites that offer improved performance and sustainability. Through ongoing investments in research and development, we deliver cutting-edge solutions that address the evolving needs of our customers. As one of the best injection mold suppliers in China, we pride ourselves on our commitment to excellence.

In line with our commitment to sustainability, we prioritize environmentally friendly practices. We proactively seek sustainable alternatives, such as biodegradable polymers, and implement recycling initiatives to minimize the environmental impact of our manufacturing processes. By choosing our custom injection molding services, you can align your brand with sustainable manufacturing practices and contribute to a greener future.

Quality is of the utmost importance to us, and we maintain stringent quality control measures throughout the entire manufacturing process. Our state-of-the-art facilities and skilled technicians ensure that each product undergoes rigorous inspection and testing, guaranteeing exceptional performance, reliability, and customer satisfaction.

When you partner with Sincere Tech as your preferred China mold maker, you can expect the highest level of professionalism, expertise, and innovation. We are dedicated to helping you bring your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Our expanded capabilities include:

  1. Rapid Prototyping: We offer rapid prototyping services to quickly transform your concepts into tangible prototypes, allowing for iterative design improvements and accelerated product development.
  2. Precision Tooling: Our advanced tooling capabilities enable us to create high-quality molds with tight tolerances, ensuring consistency and precision in your injection-molded products.
  3. Overmolding: We specialize in overmolding, which allows for the combination of multiple materials or components, resulting in enhanced functionality, aesthetics, and durability.
  4. Insert Molding: Our expertise in insert molding enables us to securely encapsulate inserts within the molded parts, facilitating efficient assembly and enhancing product performance.
  5. Two-Shot Molding: With two-shot molding, we can produce complex, multi-material components in a single operation, reducing assembly requirements and enhancing design possibilities.
  6. Value-Added Services: In addition to injection molding, we offer a range of value-added services, including product assembly, packaging, and logistics support, streamlining your supply chain and reducing costs.

Partner with Sincere Tech Mould suppliers for your custom injection molding needs (no matter Multiple Cavity Mold or single cavity mold), and benefit from our comprehensive capabilities, unwavering commitment to quality and sustainability, and our drive to exceed your expectations at every step of the process. Together, let’s bring your innovative ideas to life.

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