Tag Archive for: high volume custom injection molding

high volume plastic injection molding

High volume injection molding is a critical process in manufacturing large volumes of plastic parts in a short time. It’s a straightforward process involving two key steps: acquiring the mold and then using it to make parts. This systematic approach helps cut down the cycle time and ensures that the output is standardized and, hence, is cost-effective for large projects due to economies of scale. Also, it has versatility in the choice of material since it can work with almost all types of plastics.

Quality control is also given a high priority at Sincere Tech when it comes to high-volume injection molding. The emphasis is made on the quality and accuracy of each part made of plastic. First of all, we focus on cooperation with clients to identify their requirements for the design, materials, and production. Our expert team then uses CAD models to design custom injection molds, and then we test them to ensure that they meet the required standards before the actual production process is initiated.

In this case, we use modern machines and fully automated production lines to ensure that we produce high-quality products with efficiency and accuracy. There are several quality control checks that are done at the various stages of production; this includes checking the raw materials before they are used and checking the final product before it is sold. The performance is also monitored through the use of continuous data analysis to achieve the best results at every stage of production.

High Volume Injection Molding Materials & Technologies at Sincere Tech

Our high volume plastic injection molding services at Sincere Tech involve a variety of materials, including thermoplastics like PE, PP, PS, and PVC, and thermosets like epoxy, phenolics, and melamine.

Accuracy in molds is very important when it comes to manufacturing high quality, identical injection molded parts in large quantities. We employ state-of-the-art CAD/CAM technologies to design and develop molds specific to each component’s specifications. Automation is very important in our high production injection molding process to reduce cycle time, increase productivity, and reduce manual handling for quality production.

High volume injection molding


Custom High Volume Injection molding at Sincere Tech

Sincere Tech is a company that deals with high volume custom injection molding of plastic products. Our services range from prototype to production quantity levels. We pay close attention to the management of our high-volume molds regardless of the number of shots, cavities, or the number of shots required. Such attention to detail ensures that every aspect of mold design and manufacturing is in harmony with the project objectives and schedule.

The approach that we have adopted with our clients is to design and engineer the products and, at the same time, create high volume cost effective molds. Sincere Tech provides services such as low volume molding, insert molding, and pad printing for different industries such as medical, electrical, hand tools, communications, and automotive.

We employ hi-tech computerized systems and mechanical gadgets to facilitate production and quality control. Our services range from designing to delivering the end product, thus offering a complete plastic injection molding solution for every project.

High volume injection molding at Sincere Tech also ensures that the manufacturing process of the plastic parts is fast and cheap, and the quality of the products is always high since they are all alike. This commitment to quality improvement means that no matter if an order is for a few prototypes or a million production parts, the quality is the same. For high-quality and fast, high-volume molding services, please contact our specialists at Sincere Tech.

Three Volumes of Injection Molding

Different plastic injection molding providers often focus on specific volume categories:

Small-Volume Plastic Injection Molding: These providers are most suitable for projects with less than 10,000 parts. They usually employ aluminum tooling for short time production runs. Small-volume specialists are great for; Small-volume specialists are great for:

Prototyping injection molding: Cheap and fast for determining the feasibility of designs, form, fit, and function, and for prototyping before production.

Low-volume injection molding production: It is a very efficient and economical process for applications such as specific medical devices that are not required to produce hundreds of thousands of parts.

Market testing and pilot production: Perfect for making a transition from short-run production to volume manufacturing.

Medium-Volume Plastic Injection Molding: These companies specialize in medium to high volume production of between 10,000 and 750,000 parts. They use aluminum or pre-hardened steel tooling, depending on the order size.

Large-Volume Plastic Injection Molding: These providers focus on orders over 750,000 parts and can manufacture hundreds of thousands of parts with precision and quality. They employ only the best hardened steel molds and incorporate modern technology, and they usually do not take orders below 750,000 parts. This category includes:

  • High tolerance precision, low scrap loss, and low cost.
  • Little post-production work is required because of the technology used and the quality of molds.

Considerations for Choosing Between Low and High-Volume Injection Molding

Choosing between low and high-volume injection molding depends on several factors that should be considered carefully:

Production Needs: If the production requirement is less than 75,000, then low-volume injection moulding is often the most suitable because of the cost advantage.

Design Complexity: In the case of special or prototype designs, low-cycle injection molding is useful in the economical testing and development of the tool.

Production Cost: When costs increase during production, prototyping, and automation can be advantageous to a business. High volume injection molding becomes more possible in such cases as it greatly cuts the cost of per unit production.

Set-Up Budget: It is possible to begin with low volume injection molding, especially if there is a limitation on the amount of capital to be invested in the molding process since high-volume molding calls for a huge investment at the initial stage. Also, high-volume processes using steel tools will result in long cycle times and high material costs.

Advantages of High-Volume Injection Molding:

  • Cost-Effective Production: Flexible and fast, which reduces labor and material expenses.
  • High-Production Output: Can manufacture many parts at once to address the variations in demand.
  • Consistent Quality: This guarantees that the parts are accurate and similar, with very small variations and complex features.
  • Versatility in Part Design: It can produce various designs and shapes and work with different geometries.
  • Reduced Waste: Reduces the amount of scrap and waste since injection parameters are well controlled and the molds used are of high quality.
  • Increased Production Efficiency: Very low level of manual intervention and is mostly operated through computer systems.

Disadvantages of High-Volume Injection Molding:

  • High Initial Investment: This involves a high initial cost for mold design and construction.
  • Long Lead Times: The creation of molds can take a long time since the design and production of molds require time.
  • Limited Material Choices: Some plastic resins may not be ideal for high-volume manufacturing.
  • Limited Design Flexibility: Accurate process that restricts the geometry of the part, especially for intricate shapes.
  • High Maintenance and Repair Costs: Maintenance and repairs of molds are often costly and may require frequent replacements.

Material Types Used In High Volume Injection Molding

High volume injection molding requires careful consideration of the type of material to be used to get the best results. Polypropylene (PP) is the most popular type due to its low cost, high strength-to-weight ratio, and high impact resistance. It is used in the automotive, packaging, and consumer goods industries. On the other hand, Acrylonitrile Butadiene Styrene (ABS) has the properties of being tough, impact resistant and smooth finish used in toys, automotive parts and electronic devices.

Polycarbonate (PC) is highly valued for its ability to withstand impact, transparency, and heat stability, which makes it suitable for the automotive, aerospace, and electronics industries. Polyethylene (PE), which is flexible, hard, and chemically resistant, is used in packaging, plastic bags, and agricultural films because it is light and can be molded in many ways.

Polyethylene Terephthalate (PET) excels with its strength, transparency and barrier properties, making it suitable for use in beverage bottles, food packaging and protective packaging. Finally, Polystyrene (PS) is cheap, lightweight and insulating, which makes it ideal for use in disposable cups, packaging and insulation. Each of them meets certain requirements, which guarantees the quality of the final product in large-scale injection molding.hdpe injection molding

Machine Types Used for High volume Injection Molding

Injection molding machines are used in high-production processes, where the plastic material is injected into a mold to produce different parts.

Hydraulic Injection Molding Machines are machines that use hydraulic pressure to operate and are characterized by high production rates but slow cycle rates, thus appropriate for high production volume but low cycle time applications. Electric Injection Molding Machines, which are driven by electric servo motors are very accurate and fast and are suitable for applications in areas such as the production of medical equipment and electronics.

Hybrid injection molding machines are a combination of hydraulic and electric machines, which are efficient, fast and offer high production rates, thus suitable for high production requirements.

Two-Shot Injection Molding Machines are used to make parts of two different materials or two different colours and are suitable for making parts with high complexity.

Multi-Material Injection Molding Machines have multiple injection units for the processing of different materials at once to meet the requirements of parts with different properties such as strength, durability, and flexibility. Liquid Injection Molding Machines are specifically designed for producing LSR parts, and the parts are very accurate and strong, making them ideal for applications such as medical equipment and automotive parts. These machines are used to meet particular production needs and help achieve high-quality and fast high-volume molding.

Design Considerations For High Volume Injection Molding

Several factors need to be taken into account when designing a plastic part for high-volume injection molding.

First, the wall thickness should be uniform so that the cooling process will not be a problem and the part will not warp. Thin walls are suitable for mass production as they use less material and time as compared to thick-walled parts that provide extra strength where required.

This is also true in the size and shape of the part, as it determines the time taken in production. Shapes that are large or complex may take longer cycles or specialized equipment which increases the cost. The more complex the design, the more difficult it is to produce many items; therefore, geometric patterns are preferred. Draft angles should also be incorporated into the design to enable easy removal of the parts and to prevent problems such as cracking or deformation during production.

The location and size of gates are very important. Gates should be positioned so that they will not compromise the structure of the building and be of the right size so that they do not interfere with the flow of materials that are to be transported. Material selection should take into account the requirement of the part to be manufactured in terms of strength, durability, and flexibility.

Surface finish matters too. The surfaces of parts should be polished and should not contain any imperfections such as warping or sink marks. Some of the factors that help in attaining a smooth surface include proper gate placement, mold design, and the choice of material. Lastly, tolerance, which is the permissible deviation in the dimensions of the parts, should be given due consideration right from the design stage so that the parts can be manufactured accurately and with a high degree of precision.

Shrinkage rate

Common defects In High Volume Injection molding

In high volume injection molding, there are several types of defects that may affect the quality of the end product. Sink marks are those marks which are formed due to the uneven distribution of material during the cooling process and can be avoided by redesigning the part and ensuring that the wall thickness is uniform. Distortion, which results in part distortion, can be prevented by regulating the temperature of the mold and by including features that reduce stress.

Flash excess material that protrudes from mold joints is caused by misalignment or lack of clamping force and can be avoided by correct alignment of the mold and sufficient clamping pressure. Short shots and incomplete filling of the mold cavity due to problems such as low injection pressure or blocked gates can be solved by adjusting the injection parameters and gate design.

Finally, weld lines, which are apparent signs of meeting flow fronts, can be avoided with proper design of the mold and injection parameters to ensure equal material distribution. These strategies assist in ensuring that the quality of the products produced by the high volume injection molding is high.

Tips To Maximize the Productivity of High-Volume Injection Molding

Problem-solving in high volume injection molding is crucial to ensure the quality of the end products. Here are some practical tips for addressing common issues:

Check Machine Settings: Start the problem-solving process by checking the injection molding machine parameters. Ensure that the temperature, pressure, and cycle time are correctly set depending on the material to be processed.

Address Material Flow Problems: Pay particular attention to any problems that may arise in the field of material flow. Defective settings of the machines or the presence of barriers in the flow of materials can also be a hindrance. Make sure that the material does not jam in the machine during the process.

Combat Warping and Shrinkage: Distortion and shrinkage are typical issues in large-volume injection molding because of non-uniform cooling. Reduce the cooling time depending on the material properties to prevent warping and shrinking of the part.

Prevent Air Traps: Air locks are formed when air is locked in the mold cavity, and this results to the formation of voids or bubbles. Make sure that there are no trapped air pockets in the mold so that they do not influence the final product.

Monitor the Process: Ensure that you monitor the whole injection molding process very closely. The following are some of the best practices that can be followed to ensure that the problems are detected early: This proactive approach enables one to prevent possible issues that may affect the quality of the products.


If you are still unsure of which molding process to use, you should consider seeking the help of a professional.  However, to get the best results, it is imperative that the selected injection molding process is in sync with the production requirements.  Any difference can lead to an interruption of the production process, and this, on its own, increases the cost greatly.

They may cause disruptions that hinder production, and this, in turn, has an impact on your ability to produce quality products at reasonable prices.  This can, in the long run, affect your customer relations and their satisfaction levels.

Sincere Tech is one of the leading China high volume injection molding companies in the Plastic Injection Molding industry, and it has always been appreciated for its good communication with customers and clients from all over the world.  They can advise you on what you need to do and how to do it to lead you to the right decision concerning your production needs.