What is Plastic Injection Molding

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Injection molding is a molding procedure whereby a heat-softened plastic material is forced from a cylinder into a relatively cool cavity giving the article the desired shape. Injection molding is a manufacturing technique for making parts from the plastic material. Molten plastic is injected at high pressure into a mold, which is the inverse of the desired shape. The mold is made by a Mold Manufacturer China Company from metal, usually either steel or aluminum, and precision-machined to form the features of the desired part. Injection molding is very widely used for manufacturing a variety of parts, from the smallest component to entire body panels of cars.

The process of plastic injection molding



An injection molding machine consists of three basic parts, the mold plus the clamping and injection units. The clamping unit is what holds the mold under pressure during the injection and cooling. Basically, it holds the two halves of the injection mold together.

During the injection phase, plastic material, usually in the form of pellets, are loaded into a hopper on top of the injection unit. The pellets feed into the cylinder where they are heated until they reach molten form (think of how a hot glue gun works here). Within the heating cylinder there is a motorized screw that mixes the molten pellets and forces them to end of the cylinder. Once enough material has accumulated in front of the screw, the injection process begins. The molten plastic is inserted into the mold through a sprue, while the screw controls the pressure and speed.

The dwelling phase consists of a pause in the injection process. The molten plastic has been injected into the mold and the pressure is applied to make sure all of the mold cavities are filled.

Then the plastic is allowed to cool to its solid form within the mold. The clamping unit is then opened, which separates the two halves of the mold. An ejecting rod and plate eject the finished piece from the mold.

Extrusion

A machine used to extrude materials is very similar to the injection-moulding machine explained above. A motor turns a thread, which feeds granules of plastic through a heater. The granules melt into a liquid, which is forced through a die, forming a long ‘tube-like’ shape. The extrusion is then cooled and forms a solid shape. The shape of the die determines the shape of the tube.

Advantages of Injection Molding 



– High tolerances are repeatable 

– Wide range of materials can be used 

– Low labour costs

– Minimal scrap losses 

– Little need to finish parts after molding

Plastic Injection molding
Plastic Injection molding

Disadvantages of Injection Molding



– Expensive equipment investment 

– Running costs may be high 

– Parts must be designed with specific molding consideration.

Overview

Injection molding is a relatively new way to manufacture parts. It is a fast process and is used to produce large numbers of identical items from high precision engineering components to disposable consumer goods. Injection molding is often used in mass-production and prototyping. It produces such small products as bottle tops, sinks plugs, children’s toys, containers, model kits, disposable razors and parts of cameras. The process can even mould such large items as dingy hulls and kit car body shell parts.

What to know more about injection molding? Please go to
https://en.wikipedia.org/wiki/Injection_molding to take a look.

Plastic Mold Technology

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Plastic mold technology​

Plastic injection mold develops day after day. Each time, on exhibition, we can see that all manufacturers will exhibitor their newest and most advanced mould technology to attract customers. K fair in German is one of the most famous plastic industry exhibitions, there are many famous plastic injection moulds manufacturer will attend the fair and display their newest and most advanced plastic injection moulds. Besides K fair, NPE in America, Italy Milano PLAST, Plastic Magen in Mexico, Brazil last, Canton fair and Chinaplast, they are all world famous plastic injection moulds industry exhibition where can learn a lot of advanced plastic mold technology​.

In recent years, gas assistant molding system and RHCM (Rapid Heat Cycle Molding) are the top two advanced plastic injection moulds technology.

Plastic Mold

plastic mold

The gas assistant molding system

Gas assistant molding is a kind of new technology which brings the high-pressure air into plastic molding parts to let the plastic product with hollow section. Compare to traditional plastic molds​, it can reduce the weight of the product; realize thick wall and thin wall at the same time. The product surface will be more beautiful than traditional mould, without shrink mark, deformation and other molding defects. This kind of molding technology is more and more widely used in commodity products plastic injection moulds, household appliances product plastic injection moulds.

ST after some years’ research and development, it succeeds on gas assistance molding technology on various kinds product, such as for plastic chair, plastic handle and so on. Below is the picture of our design of a gas assistant chair for your reference.

Besides, injection machine and plastic injection mould, gas assistance equipment including Nitrogen Generator, pressure controller unit and air inlet parts.

RHCM (Rapid Heat Cycle Molding)

It is a kind of high speed and high-temperature molding technology. Put some Glass Fiber into plastic raw material to get the plastic product with high hardness and reflective surface. RHCM can remove the molding defects like melt line and flow mark which will appear in traditional plastic molding.

RHCM use high steam to make the mould cavity surface to reach the plastic raw material distortion temperature. Mould with high temperature ensures the good flow of plastic raw material; it makes the material fast flow and filled. It can avoid material to become more solid. This kind technology realizes no cooling molding and product with high glossy appearance without molding defects like deformation, melt line, flow mark, silver line. This kind of mould with short cycle time, reduce around 70% compared to traditional molding.

Plastic molds

plastic molds

RHCM mould have its advantage, it also have some disadvantages

  •  Mould steel will be easy crack
  •  Oil stain – As the mould temperature will be exceeding 130 ℃
  •  Gate area will appear white mark

Even though, RHCM technology is not widely used on market, but it will be a main technology in future as more and more customer require for high quality product, especially for outer parts. Nowadays, RHCM mould is mainly used in outer part product, like TV case and some automotive parts.​

If you want to know more information about plastic mold​​ and plastic mold technology, welcome to go to our mold blog http://mold.world.edu/, there are lots of plastic mold information to help you

Plastic Injectioin Molds

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The field of the industry has become very advanced and each time we can observe some new inventions over there. In this wide field of industry, we have to use various necessary technologies. You may have seen various products are made of plastic or rubber. Is this not a surprising thing to notice how these plastic products are made? Yes, this is surprising as well as interesting too. As the technology for producing such plastic products is used is known as injecting pr prototype molding. There are lots of expert and advanced service providers which have a team of professionals who look after the matter of Injection molding molds

Another important tool of molding is prototype mold. In this advanced technology, some host material is injected to produce such plastic products. The prototype mold is made of 7075 T6 aluminum. You must be interested to know what for these molds are built. These are mainly made for producing tooling frames. The components for molds are fitted into the frame and thereafter the frame is positioned on the machine. This technique is quite different and easy than that of regular mold. In this technique, the experts never use spruce plates. Also in regular molds we often can see the use of clamping plates but in this prototype molding technique, we can never see the use of such plates.plastic injection molds

There are different types of companies which have noticeable stock of equipment of prototype mold makers. One can easily place an order for the required item and these expert teams will select the accurate item from the huge stock. If you are interested regarding how to get in touch with such companies then you just need to go through the website of these companies to have knowledge about the details. So, do not waste your time more and get in touch with the expert today itself.

If you are willing to understand the processes which are followed in these companies dealing in Plastic mold business then, in that case, you can search on the web to get better ideas in this regard. In the other way round you can meet the experts of any reputed company in this field to understand the process and once you are satisfied with it then you can decide on the point whether to hire the services of the company or to find a new one for this task.