The Process Of Plastic Injection Molding

There might be a number of plastic products that you usually see or use every day. Mostly these products are not only useful, but also have an aesthetic appeal. But, have you ever wondered how these products are made or how every other product has a unique shape or finish? Well, the answer for this question is Injection Molding. This process is used to mold and fabricate plastic parts and thereby a variety of plastic products are produced for immediate uses as well as industrial applications. Continue reading to know more about Injection Molding Of Plastic.

The Process Of Plastic Injection Molding:

Injection molding process is very short and requires approximately two seconds to two minutes. The stages are as follows:

Clamping

Before injecting the material into the mold, the two halves of the mold are first closed securely using a clamping unit. The two halves of the mold are attached to the injection molding machine. Then, one half of the mold is allowed to slide. After this, the clamping unit that is hydraulically powered pushes the mold halves together and exerts force so as to keep the mold close together while the material is injected inside. Machines with greater clamping forces will require more time.

Injection

After this, raw plastic which is usually in the form of pellets is fed into the injection molding machine. The material gets melted by heat and pressure within. Thereafter, the molten plastic is injected into the mold very fast and the high pressure within the mold packs the molten plastic inside. The quantity of material that is injected into the mold is referred to as a shot.

Cooling

After injection in the mold, the molten plastic has to be cooled in the next stage. Thereupon, the solidification of the molten plastic starts and it gets solidified into the desired shape. Shrinkage of some part of molten plastic is obvious to take place during the cooling process. Mold cannot be opened till the cooling time has elapsed.

Ejection

After cooling, the cooled part is ejected from the mold using the ejection system. This ejection system is attached to the rear part of the mold. Force has to be applied to eject the part from the mold since the part shrinks and adheres to the mold during the cooling process. A mold release agent can also be sprayed onto the mold cavity prior to injecting the molten plastic to facilitate the ease of ejection. After the material has been ejected, the mold is clamped shut for the next shot.

RSP Inc. is a China-based company that can be approached for Plastic Injection molded products. It is ranked amongst the topmost Plastic Molding Manufacturers in China. It offers High Quality Low Cost Custom Plastic Tooling, Injection Molded Plastic and Custom Plastic Injection Molding. The company has over fifty years of experience. For more information, log on to http://www.rspinc.mobi.

Author is representing this article on behalf of RSP Inc., RSP Inc. is a manufacturer & supplier of products like custom membrane switch.