Injection Molding Machine

Basic Parts of a Plastic Injection Molding Machine

A Plastic injection molding machine or the injection press is used by most plastic manufacturers to produce plastic through the process of injection molding. Through this machine, the process of molding plastic products can be quickly done, which can either be in vertical or horizontal position. There are two major parts that make up the plastic injection molding machine, and these are the injection unit and the clamping.

The injection unit is part of the machine where plastic is being melted. The parts that work during the injection process are the hopper, reciprocating screw, barrel, heater and the nozzle. When the plastic granules have been added to the hopper, it will slowly go down into the barrel. It will then be pushed by the reciprocating screw through the heater. Using the appropriate temperature the plastic will then be melted and through the nozzles it will be passed to the clamping unit.

injection molding machinery
injection molding machinery

This is the part of the plastic injection molding machine where the molding process will take place. The clamping unit consists of mold cavity, mold, and the moveable platter. From the nozzles, the melted plastic will be pushed to the mold cavity where the plastic is going to be cooled down and hardened. After it has hardened, it will be transferred into the mold and to the moveable platter. The plastic will be removed from the plastic injection molding machine to clean its surface. It must be free from any excess plastic and once it is already clean it can now be stored for finished product.

The plastic injection molding machine is very useful especially to those who are involved in the plastic business. More plastic manufacturers use this machine because it will speed up the process that will result for increase in the productivity and profit.

Injection Molding

Do you know the name of the process by which most plastic solid materials are produced? It is called Injection molding. It is a simple process. However, the process may require practice for efficiency.

What is the process of Injection molding

During the process of plastic injection molding, the plastic is heated till it melts and is introduced, under pressure (injected), into a mold. The mold may be made up of any metal such as steel or aluminum. The molten form is then allowed to cool down and set into a solid form. The plastic material thus formed is then retrieved out of the mold.

The actual process of plastic molding is just an expansion of this basic mechanism. The plastic is let into a barrel or chamber under gravity or force-fed. As it moves down, the increasing temperature melts the plastic. Then, the molten plastic is forcibly injected into the mold under the barrel with an appropriate shape. As it cools, it solidifies. The plastic molded like this has a reverse shape than that of the mold. A variety of shapes both 2D and 3D, can be produced by the process. The process of plastic molding is cheap due to the simplicity involved and the quality of the plastic material is modifiable by changing the factors involved in the custom injection molding process:

– The pressure of injection can be changed to change the hardness of the final product.

– The thickness of the mold also governs the quality of the article produced.

– The temperature for melting and cooling determine the quality of the plastic formed.


The major advantage of injection molding is that it is very cost effective and fast. Apart from this, unlike the cutting processes, this process rules out any undesired sharp edges. Also, this process produces smooth and finished products that require no further finishing.

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Hot Runner Plastic Injection Mold

Hot Runner Plastic Injection Mold

Hot runner mold can keep the plastic material melting in runner and gate by durative heating. Hot runner system includes  nozzle, hot manifold, temperature controller box, spare parts and so on.

  • What are some advantages of hot runner mold in plastic injection molding process?

1, Shorten the molding cycle time.

Because there is no limit of runner cooling time, the products can be ejector promptly after forming. The cycle time of many thin wall parts which manufactured by hot runner is under 5 seconds.

2, Save the plastic raw material. There is no cool runner in the hot runner system mold, so wasting material will not appear. If the plastic material you use is very expensive, pls choose hot runner for it can reduce the cost of material fee.

3, Expand the application of injection molding process .Hot runner plastic injection mold

Many advanced technology in plastic injection molding developed on the basis of hot runner technology. Such as PET perform, stack mold and so on.

  • What about the maintenance of hot runner mold?

Hot Runner Systems requires a new level of expertise on the part of the mold maker. However, this does not mean that it is too complicated or highly specialized. A well designed system is relatively maintenance-free if it is installed correctly.It can and should happen that tool makers frustrated with these systems and I swear I have too much trouble. This is usually due to the fact that the system is not installed correctly or incorrectly used in the mold.L ‘leading system manufacturers are in support of a well-trained team of specialists to support the proper installation and operation of systems. The time required to listen to these specialists is a good investment!

  • There are several types of hot runner systems?

There are almost as many species are the suppliers! Most have some common characteristics, however. There Sprue gating systems, valve gates, doors peak (most common) and gate edge. Each of the major suppliers candescribe in detail why their system is best suited for your application. Hot runner systems are some of the key components of the form

As a long-term performance

Although an initial investment with hot runner systems, it is easy to justify the long-term benefits. Without increasing the complexity of the design of form, a hot runner plastic injection mold equipped to reduce costs significantly. Because the hot runner is designed and produced independently but at the same time,The times are not affected.Toolmakers should always advise their clients on ways to reduce costs and forms to improve the performance of the mold. His in-depth systems with various runner is a line of common sense shows an active role in supporting the processor down. This in turn increases the likelihood of even more business for mold.