Plastic Mold Company

Many people assume that Chinese plastic injection molds are going to be poor quality.

However, a huge number of companies- including multinational corporations- still choose to buy such plastic molds.

Does that mean these companies are naive or making a mistake?

Of course not.

In fact, Topworks plastic mold company ,as one of China plastic mold manufacturers, is capable of making some of the best molds on the market- for a much lower price(35% COST LOWER,15 BUILDING DAYS LESS) than European and American companies can possibly offer.

China has seen a steady increase in the number of manufacturers of plastic injection molds as the industry has grown to be globally competitive.

Not only do we have the skills required to make superior injection molds, but we also possess excellent English skills for technology and business.

That extends into the Topworks marketing departments, too- most of our sale stuff have a strong grasp of CAD drawing, and the technology capability to choose the right mold building project for you.

This allows them to speed up the communication process between Topworks and the customer.

When making a new plastic injection mold, not only in China, but all over the world, the process usually starts with a rendering of the final product drawing.

After reading the drawing, engineers can then adjust how to build the mold based on things like the size and structure of the intended parts, the choice of material and how to keep the cost as low as possible – all while considering everything the customer asks for.

plastic mold

plastic mold

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Our factory has worked with multiple European and American companies for many years now, so all you need to do is send us your drawings- we’ll be happy to carry out a test to show you what we have to offer.

Mold manufacturing has been around in China for over 30 years, meaning there are plenty of high-quality manufacturers operating today.

Many possess the same skills and experience as their western counterparts.

While they may only be paid around 65% of what they could make doing the same job in the US, they will still produce top quality molds that you can really rely on.

How should I go about choosing a Chinese injection mold supplier?

To clarify, the reason why a lot of US and European clients are declining to get their plastic injection mold from China is mainly because they are often more affordable (up to 35% cheaper than in their country).

It should not, however, be the only factor you evaluate when weighing your options- you should also consider the following as a second factor to make sure that the company you choose is likely to provide you with a comprehensive task when it comes to developing the mold.

  1. Can they afford to serve customers worldwide?
  2. Consumers who used the service earlier and gave us their recommendations
  3. Tool steel quality
  4. The manufacturing plant and the gear of their gear is of an industry-standard.
  5. Measures for quality control and validation
  6. If you opted for a service provider who understands what they are dealing with, then you may not have to waste your time.
  7. Ability– will they be able to carry out the entire task themselves, or will they have to employ a third party to help them with it?
plastic mold structure

plastic mold structure

The process of plastic mold making

A design engineer is generally responsible for drawing a component pattern of the new part before the tool maker can start the actual production of the mold. This blueprint gives the tool maker an idea of what the new component will look like, so he can start designing the mold before proceeding with the work.

In order to design a mold in a way to replicate the finished part very precisely, the specifications of the final part must be carefully reviewed. By performing the initial design on the computer, the mold designer can get accurate results.

The designer of a mold has to consider not only the gate on the part, but also the flow of water in the mold, to decide where the parting line will be on the part, and also to determine how the parts will be pushed out of the mold.

Once these decisions have been made, the actual machining steps then begin. There are a variety of operations that need to be carried out in order to make a mold, the raw metal blocks need to be cut into rough dimensions.

To obtain exact dimensions, precision machining is required, with this precision machining, this machining generally entails milling operations, grinding, drilling, and the use of electrical discharge machining or EDM.

The process of using the lathe to polish the surface of the mold once it has been completed.

There have been several trials done to determine how well the mold is able to produce good parts in an appropriate cycle time.

Plastic mold making tips

It is a prevalent understanding that the injection molds are as varied in profile, complexity and size as are the parts they are used to produce.

The most simple form of injection molding involves two pieces of steel plates (core and cavity plate) that can be easily installed in a small injection machine and which can also be molded using directly cutting the impression of the article to be molded into the steel.

More complex injection mold will have more cooling channels for controlling the temperature and means for ejecting the moldings.

A sliding block may be provided for undercut sections of the part,unscrewing devices for moldings that have a screw thread, and plastic in runner of the mold may be kept hot to provide a good fluid path.

For the purpose of ejecting the moldings after injection molding, there are sometimes hydraulic devices installed, and sometimes compressed air is applied.

The process of the production of an injection mold generally begins with the design and construction of the mould. Care must be taken to optimize the design of the components so that they can be molded, and then it must be ejected in the construction of the mold itself.

Then, if necessary, it will be tested and if necessary, modified before the mold production department is entrusted from producing the mold.

Steel is traditionally used to manufacture molds, and it is still the most common material that is used.

Cavities and core inserts are crafted from high quality tool steel that can be hardened as needed.

ejector pins and other ejectors are made with hard tool steel when it comes to ejection system, so the same goes for the guide pins and bushes as well.

The molding housing, or bolster, is made of the mild steel that is softer than the hard steel.

In fact, in the production of the mold, it is best to use this grade of steel for all the parts that do not have to endure frictional wear and tear, as it results in minimizing the mold builder’s costs.

Also, the steel grade must be selected carefully so that the surface finish required matches what the demand is.

In the past, molders have been unwilling to accept other materials, such as POM,PVC, on the basis of the assumption that the abrasive action of the plastic passing through the mold will gradually wear away the surface polish.

Thermosetting materials and compression are what happen in this process, and the process of making transfer molds is nearly always hardened and chromium plated.

plastic mold

In retrospect, thermoplastics have little abrasive action and therefore most of the time even when runs have run as high as one million or more, soft materials have been used after hardening, especially for householdware plastic mold

These materials include aluminium, brass, zinc, aluminum-zinc alloys (Kirksite).

The two last materials are ideal for prototype work since they can be cast easily from them using machines.

You need to always look for the best possible mold when it comes to long-run products. Such molds are very costly, however, their cost per unit item is calculated out of ten and one hundred thousand items per mold, which is very small.

Over a long period of time the value of a well-made mold will grow and in its turn, the cost of the mold will rise. This is because a well-made mold will not require frequent repairs while the value per unit of finished product will be very high.

plastic mold plant


Nowadays, more and more customers want custom molders to make prototypes so they can evaluate the market, and then ask them to make several thousand pieces of the mold design with hardened steel.

A prototype mold is exactly what its title suggests, a mold that is being created to serve as a prototype for a product.

On rare instances, from a product mold, one could find a way to make a long production run, but this is never a matter of course in a business world.

The good thing about a prototype mold is that it teaches us a lot about how molds should be manufactured and makes us a lot more confident that we will produce a good mold, but that is probably the extent to which a prototype mold can be helpful.

Comparable Standard    Delivered Hardness (Surface) 
LKM P20MP20Modified1.2311 Modified260-35026-38
LKM738 MH ESRP20Modified ESR1.2738 Modified ESR718H341-40036-43
LKM838HSP20Modified1.2738 Modified330-38035-42
LKM 808 ESRP21Modified ESR360-41538-44
LKM2083420SUS420J21.2083S136Annealed to HB 240 (max)
LKM2083 ESR420Modified ESRSUS420J2 Modified ESR1.2083 Modified ESRS136 SUPAnnealed to HB 250 (max)
LKM23161.2316Annealed to HB 250 (max)
LKM2316H丨 265-34027-36
LKM2343HllSKD61.2343Annealed to HB 229 (max)
LKM2343 ESRHllESRSKD6ESR1.2343 ESRAnnealed to HB 229 (max)
LKM2344M HHH13 ModifiedSKD61 Modified1.2344 Modified8407Prehardened to HRC 37-43
LKM2344H13SKD611.2344Annealed to HB 229 (max)
LKM2344 ESRH13ESRSKD61ESR1.2344 ESRAnnealed to HB 229 (max)
LKM S7MS7Modified1.2357 ModifiedAnnealed to HB 229 (max)

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