Blog about buying plastic mold, plastic injection molding parts from China Plastic Injection mold and molding companies, advantages and disadvantages buying plastic molds and plastic molding parts from China.

Prototype Part & Proto Mold

Getting the Perfect Prototype Part & Proto Mold

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If you are a manufacturing company that is developing a new product that requires injection molding, then obviously looking for an injection molded plastics shop is your first step in getting the part created. However, if you are hung up on the fact that you aren’t sure exactly what you want, don’t let it stop you from contacting an plastic molding company.

The process in and of itself always involves custom molds, and most companies, therefore, have the capability to help create prototyping parts or proto mold that will suit your needs perfectly.

Plastic injection mould is machines created to follow through with the prototype design with perfection, and the process is very reliable. Mass production is what these machines are built for, and those that run them have years of experience behind their belts.Prototype Part & Proto Mold

Plastic Injection mold is all designed in fairly similar fashions, with a hopper to melt the chosen plastic or rubber materials and then the injection section to transfer the molten material into the mold.

The time needed for each mold to set is not long, and each plastic injection mold is then able to remove the dried and sturdy part from its mold before moving it along to another section of production.

Although the above description is very general, and the details of how each plastic injection moulder works vary depending on its size and style, most of the above still apply. The process is so dependable and accurate it doesn’t require much fine-tuning.

So once you have worked with a plastic injection molding company to achieve your dream prototype parts or verified the project by proto mold, making the plastic injection mold to massive produce the part is a walk in the park. Most of these places also offer short runs for smaller batches of the product, in case your company wants to test the success of the new part you have created.

Sincere Tech offers prototyping parts, proto mold fast in two weeks, as well as production plastic mold for all of the customers, if you have a new project that needs to make prototyping parts or proto mold in advance, send us an email

5 Axis CNC Machine

5 Axis CNC Machine

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5 Axis CNC Machine for high precision plastic mold manufacturing

5 axis CNC machine is used in modern industry for not only reducing the production cost, but also it saves time and increase the profit and accuracy of the job. Actually, 5 axis CNC is most useful for complex machining. We will explain it later.5 Axis CNC Machine

The most number of CNC machine is operated under 3 axis movement which is X, Y, and Z. Those movements are mainly up-down, right-left side and front-back movement. Maximum simple machining operation is performed quite completely under these three movements.

But for some special type of machining (turbine impeller) or machining, a critical surface needed some more attention. Sometimes we face the problem that With the help of all the three-axis movement that critical side cannot be faced to the spindle or cutter.

So we have to need an extra man-hour and an extra machining hour to machine that critical surface. To overcome that problem two extra axes are introduced in 5 axis CNC machine. That two axis is for tilting and rotating the job. Simultaneous movement of all the 5 axis secures the positioning of all the critical surface towards the spindle. Thus the machine becomes 3+2 axis CNC machine.

In such way, the 5 axis machine cuts the labor cost and man-hour. But the programming of such a machine is a critical one and it needs a vast knowledge of CAD/CAM. Also, work holding is a critical issue in 5 axis machining.

The work holding should be firm, rigid and there should be clear. Hass UMC 750 is a 5 axis CNC machine. In that machine, the work table provides any angle to the workpiece for machining purpose.

To make the high-quality plastic mold CNC machine is the most useful machine, 5 axis CNC machine can make plastic mold fast, high precision, contact us if you need plastic mold service for your project.

How To Convert machined parts to molded parts

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How To Convert machined parts to molded parts

Millions of plastic parts are machined.  If the annual volume is high enough, converting it to a molded part could be of advantage. With machining, you pay for the full rod or sheet and then machine a fair amount of the plastic onto the floor as waste. Extruded sheet and rod is usually more expensive per pound than injection molded pellets.  For example, if molded pellets are $5.00/lb. extruded rod of the same material will cost around $10.00/lb.  Then, you have the cost of machining on top.

Machined parts don’t just have to be plastic to become an injection molded part.  Many parts International Plastics produces were originally machined metal parts.  Be it brass bushings, aluminum, zinc castings, machined brass, many of these components can become molded parts, saving you money.

Polymers such as PEEK, Torlon, Radel, Ultem, and the special filler systems that can go into polymers these days can give your components better properties, lower cost, and longer useful life.

If you have a machined parts made before, but now you want to make high volume of those parts, molding process will be the best option, no matter it is plastic machining parts of metal machining parts, can be molded as well, contact us to talk about your project.

Plastic Moulding

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plastic mouldingPlastic molding is the plastic working through the Injection moulding machine, The melted plastic will automatically molten by the molding machine after erupting out in all of the plastic moulding methods, injection moulding technology has been the most widely used on the word today.
The method comprises the following steps: getting the thermoplastic plastic or the thermosetting plastic imported into the heating cylinder of the injection moulding machine, and when it is completely melted, it will produce heat and frictional heat by the pressure of the plunger or the screw, and is injected into the mould cavity of the closed mould, after curing, and then open the mould and take out the finished product.

If you are looking for plastic moulding service, you are welcome to contact us, we are a professional plastic moulding company in China that offer custom plastic moulding service to the wordwide.


Plastic Moulding Knowledge Guidance

1 The basic knowledge of plastic molding.
1.1 The characteristics and composition of plastic injection moulding.
Plastic Injection moulding is to fill the molten moulding material in a closed mould with high pressure. The pressure that the plastic molding cavity needs to be subjected to about 400 KGF /CM2, approximately 400 atmospheres.
With such a high pressure to make a product is its characteristic which is not the only an advantage but also disadvantages. In other words, the mold always has to be made stable, therefore its’ price is always high. So must be mass-produced in order to buckle with high-priced mould costs.
For example, the production of each batch must be more than 10000PCS to be reasonable. In other words, plastic molding work surely has to be a mass-production.

A few steps of the plastic molding process :
1.1.1 Closing
Close the door of injection molding machine and then start moulding
1.1.2 Clamping mold
Moving forward the moving half in order to get the mould closed. When the mould is closed which means is also locked.

1.1.3 Injecting (including holding press)
The barrel screw is quickly pushing forward, injecting the molten formed plastic material into the mould cavity to full fill it.
Keeping the press at the same time after full filling it, this action is particularly named “holding press.” The pressing that the mold has to bear when it just gets full filled, generally called ‘Injection Press’ or ‘one press’.

1.1.4 Cooling off (and the next step of the plasticization project)
The process of waiting for the material getting cool formed in the mould cavity is called “cooling off”, At this time the injection device is also ready for the next step, this process is called “plasticization process.
The moulded material is placed in the hopper, inflow into the heated tube to heat, it is based on the rotation of the screw turning the raw material into the molten status.
1.1.5 Opening the mould
Move the moving board to the backward and the mould will be opened.
1.1.6 Opening the security door
Opening the security door, then the machine will be in the standby status.
1.1.7 Picking up
Taking out the product, checking carefully if there is anything left in the mould cavity, and this whole forming operation is called moulding cycle time. The finished product is shaped by the shape of the mould.
The mold is composed of the left mould and the right mould, These two sides of moulds are left with voids, and the material would flow into the voids and get compressed to finish the product.
There are three main lines of the path of the molding material before it flows into the left side and right side, sprue, runner, gate, and so on.
1.2 Injection molding machine
Injection moulding machine is distinguished from two large projects, they are divided into two, clamping device and injection device.
1.2.2 clamping device
Closing the mould, the molding material would be cooled off and solidified in the mould cavity. Opening the mould cavity and take out the finished product is the action of the clamping device
1.2.3 Injection Device
Injecting the plastic material into the mould cavity called ‘Injection device’

 

The following describes the ability of the injection moulding machine, there are three provisions to distinguish the ability of it.

A. Clamping force
When the injection is made, the mould won’t be opened by the maximum clamping force, expressed as the number of TON.
B. Injection volume
The weight of a shot is generally expressed in terms of grams.
C. Plasticizing capacity
A certain amount of time able to melt the amount of resin, this is generally expressed in terms of grams.
The most important part is the clamping force, the area of the moulded article is referring the mould perpendicular to the shadow of the opening and closing direction (basically the moud’s area). The average pressure within the mold added to the projection area is called the clamping force. If the mold “projection area × average pressure” is greater than the “clamping force” then the left and the right side moulds will be pushed out.
Clamping force = projection area x average pressure within the mold In general, the mold can withstand the pressure of 400KGF /Cm2, so base on this figure to calculate the clamping force, but the clamping force often based on the shape of forming materials and the shape of the product’s vary.
The difference between the larger parameters such as PE, PP, PS, ABS materials, these raw materials are used to make the shallow box, the parameter is 300KGF /CM2.
If the depth of the box is deeper then the parameter is 400 KGF / CM2, If it is the small but high precision products. The projection area is about 10CM2 or less, its parameters are 600KGF / CM2.
The smaller parameters such as PVC, PC, POM, AS materials, these materials are also used to make a shallow box, the parameters of 400KGF / CM2, if it is a deep box of its parameters is 500KGF / CM2, if it is a small and high precision products, projection area of about 10CM2 below, its parameter is 800KGF / CM2.Chinese molding company

To working with Plastic Moulding is not easy, if you have a project that needs plastic molding service you need to find a professional plastic molding company to support you, to reduce your plastic mold and Injection moulding cost.

Find a Chinese molding company to support you will be one of the best options, plastic mould and moulding parts from China mold company has inexpensive price and short lead time, this is no reason that you do not choose your plastic molding supplier from China.
On the world, over 80% or overseas companies that buy products from China, China is the biggest manufacturer country on the world, this is no doubt about this,

Sincere Tech is an injection mold company in China, offer injection mould, plastic moulding service to the world, 90% of our mold and parts are export to American, Europe, and the world.

If you want to know more information about service, you are welcome to send us an email, if you need price for your project, please send us your requirement for quotation, we will offer you the best price and service. Hope to work together in the near future.

 

Silicone Rubber O Ring

Custom Silicone Rubber Products

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We are Custom Silicone Rubber Products manufacturing company in China. Our company produces all kinds of specifications of different grades of vulcanized pressed and liquid silicone injection molding rubber products, such as silicone gel covers, infant pacifiers, silicon rubber key-presses, slip-preventing pads, quakeproof pads, sealing ring and other series products as well as silicone rubber molds.

Custom Silicone Rubber ProductsVulcanized silicone rubber products have the following characteristics:

(1) the property resistant to high and low temperature: with long-term use at 200 ℃and flexibility at -60 ℃;
(2) Electrical insulation property: silicone rubber affords excellent dielectric property which is much higher than the general organic especially under high temperature with dielectric strength almost independent of temperature in the range of 20-200 ℃.
(3) Excellent performances of weather resistance, ozone resistance and resistance to ultraviolet radiation without crack even after long-term outdoor use. It’s generally believed that the silicone rubber can be used outdoors for more than 20 years.
(4) Excellent property of permanent deformation under high-temperature compression.
(5) Excellences include good processing performance, easy to shape, etc.; a variety of products can be made by squeezing out hot air with methods of vulcanization molding, pattern molding, extending molding and so on.Silicone Rubber O Ring

With excellent performance and good technical and economic effect, custom silicone rubber products have a wide range of applications in various areas of aviation, aerospace, atomic energy, electrical implements, electronics, instrumentation, automobile, machinery, metallurgy, chemical industry, medical health, and daily life.

The application and characteristics of injection molded liquid silicone products:
They have excellent transparency, excellent tear strength, good elasticity, excellent thermal stability and weather resistance, yellowing resistance, heat aging resistance and is mainly used in the cake mold, infant pacifiers, medical catheters, injection molding craft and so on.

If you have any project that needs Custom Silicone Rubber Products, you are welcome to contact us.

2K plastic molding

What is overmolding and 2k injection molding

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Silicone Molding Parts

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We have also gained the trust and confidence by providing our customers  Rubber Molding Parts & Silicone Molding Parts at competitive prices. Our skilled professionals manufacture this product using advanced technology and quality material to ensure durability and high tensile strength. Moreover, with its superior stability, it is a naturally preferred elastomer for diverse applications, as much as in diverse environments.Silicone molding parts & Rubber Molding Parts

We use advanced technology and assure our clients about the optimum performance. Further, we put great emphasis on continuous improvement of the product to ensure it has superior performance to save more labor costs for customers. We are involved in manufacturing and supplying a quality range of Silicone & Rubber Molding Parts which is produced using high-grade raw material that is sourced from our respected vendor base, having years of experience in the market. In addition, these are extruded to manufacture products that can be obtained in both solid and sponge characteristics on multiple extrusion lines. We provide these products with different gradations in size and specifications customizable as per the clients’ exact needs. Our range is in high demand by our client spread across the international market and can be availed at industry leading prices.

Molding can be done using two different materials. It can be rubber or silicone which are both unique. To mold the products, you need a number of items for each of them. Rubber molding and silicone molding have the same end result. However, there are distinct differences between the two. Read on to know what they actually are and their uses

What is Rubber Molding

It is the process that shapes rubber into diverse designs. Usable products are created from elastomers or uncured rubber. This means that rubber is subjected to a process that changes the way it looks. It is a project that can be done at home. The method is also used by big industries to make rubber products. Pressure and heat are used to mold the rubber. The processes can be compression molding, rubber transfer molding, and injection moulding.
Uses
Rubber molding is used to make a number of products. For instance, if you have a toy, you can make another one that resembles it. This makes two toys that last longer. You only need to know the design or style to mold it. Therefore, it is used to make duplicate items.
It is also used to harden rubber items. During the process, rubber can be mixed with materials that make them resistant. It can also get flexible to suit the clients’ needs. Rubber molding is a part of making rubber durable.

What is Silicone Molding?

It is the use of silicone to shape products that can be used. Silicone molding uses diverse methods to get a final product. They include using the block method which is the simplest. It is mixed with other products like liquid soap to get a finer design.
Uses
Silicone molding creates flexible materials. It casts a number of items such as polyester, polyurethane wax, plaster, and concrete. Other materials include epoxy resins and polyurethane foam. It makes the materials stronger and chemical resistant. This gives the materials a longer life span.

Differences between Rubber and Silicone Molding

Rubber molding is subjected to high temperatures and pressure. On the other hand, when molding silicone products, room temperature is needed. There is a difference in temperature levels in the two processes.
A release agent needs to be applied when molding all forms of rubber. As for the silicone Injection molding products, most of them don’t require a release agent.
Rubber molding is complicated and might not produce the exact shapes. The shapes might be a little bit distorted from the original one. Silicone molding is much easier to do. The shapes also take the form of the block or the casting material.
The main aim of rubber molding is to get hard material. In contrast, silicone is majorly used to create chemical resistance.
The products used for rubber molding do not shrink easily. You can store and use them for a long time. However, silicone products have a high shrinkage rate. Storing them is quite hard due to the shrinking.
Bottom Line
Rubber molding and silicone molding produce designs and shapes. The two differ completely in the end products. The materials used to make the products are also diverse. They also employ various temperatures to get the work done. Rubber molding is suitable for creating strong materials. Silicone shields the materials from chemicals. They both serve unique purposes which are important.
Do you have any project that requires rubber molding or Silicone molding parts? Contact us to get a competitive price, below are some of the rubber and silicone molding parts for your reference.

China Plastic Injection Molding Companies

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China plastic injection molding companies now are facing the heavy pressure, it is because of the currency exchange rate, inflation and heavy competitive of domestic China injection molding company. Below is the detail reason for the heavy pressure of China plastic injection molding company

  • The currency exchange rate of RMB: USD from 10 years ago 9.5 to now 6.3-6.5, this reduced Mold manufacturer China Companies profit become less & less.
  • The inflation caused the Mold manufacturer China Companies to need to pay more material cost such as mould steel and other material. Also need to pay a much higher salary, from 2009 to 2011, the general salary has been 40% increased, and not increase more every year
  • There are more than 10000 big or small china plastic injection molding companies, most of them the tooling ranges are the same. For this reason, when need any purchase order, they competed with each other by the mould price, seldom of china plastic injection molding companies are competitive by quality. This is caused the price goes down and down. Also because the international economic situation is not so good, most of the mould investors, they cut the mould price until the red line price.

Mold Manufacturer China

Mold Manufacturer China

Due to the above points, we are thinking that how could mold manufacturer China companies survival for a longer time while not like most of the European mould makers. As we know 30 years ago, many people went to German, Italy, or Portugal to order moulds, 20 years ago, people visit China Taiwan area to order the moulds, from 10 years ago, people come to Chinese mainland mould makers to custom molds. Now China plastic injection molding companies are thinking how long time it will last for people ordering moulds from China?  It is a serious question, really, we are facing some pressure.

  • Are there any new ways for China injection molding companies?
  • Is there any new technologies for mould making can be innovated by Mold Manufacturer China Company?
  • Is there will be any revolutionary for plastic molding technologies?

I think nothing is impossible, for example, if we can use new technology to melt the good quality steel, then use the + pole for core and – pole for the cavity to make the cavities and cores by the very fast and precise way. By these technologies plus some high tech steel treatment way, Chinese mould maker can make a mould within 2 or 3 days. That is really a funny thing.

Right now if you have new products that need help from Chinese mould maker, welcome to contact us.

Stack Mold

Stack Mold

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Plastic Injection Molding Companies

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Plastic Injection molding is what people call the process of filling a plastic mold with liquid plastic and waiting for it to take shape. An injection mold maker is the machine that makes the mold for injection molding. An injection mold maker makes molds from metals, usually steel or aluminum. The process calls for precision because a mistake means a repeat of the process or the part made will not be ale to function well enough and may be substandard.

The process of plastic injection molding relies solely on the accuracy of the injection mold. If the plastic injection mold maker makes a mistake in making the necessary molds needed to produce plastic product, the over all effect will be defective. The mold maker must have the precise measurements of the mold it will make in order to fully meet the standards of the manufacturer and client.

Materials Used in the Process of Plastic Injection Molding:

The usual materials used by plastic injection molding are plastic materials like polystyrene, acrylonitrile butadiene styrene, nylon, polypropylene, polyethylene and PVC. These are the liquid plastics that are usually used by injection molds to produce the plastics that they will then sell. The polystyrene material is lower in cost and in material grade. ABS is a plastic that is hardier than the previous one but not flexible. Nylon can resist mot chemical and is more flexible the previous two. Polypropylene is the plastic usually used to manufacture containers because they are tough and flexible. Plastic Injection molding is also utilized for metal works.

Plastic Mold

Plastic Mold

A Plastic injection mold maker will have to make more molds if the molds are used for metal molding. Metal molding wears out the molds more than plastic molding because the melting temperature of metals is higher than plastics. Despite this additional cost, manufacturers still utilize injection molds for metal molding because the prices of metals that are molded this way are still profitable.

Uses of Plastic Injection Mold:

Plastic Injection molding is a manufacturing technique that is used for making parts from thermoplastic materials in production. After a product is designed by an industrial designer or engineer, the models are then made by a mold maker or toolmaker from metal, usually steel or aluminum.

Plastic Injection Mold is a method of molding in which the molding material is first placed in an open, heated mold cavity. The mold is then closed with a strong top force or plug member, and pressure is put on to force the material into contact with all of the mold areas, and then proper heat and pressure are maintained until the molding material has completely cured.