What is injection  molding? 
Plastic injection molding is refers to the plastic particles melt into liquid, and then to squeeze the liquid into the metal cavity.Injected into the shape of the plastic will keep the mold cavity and cavity wall surface texture.After setting the optimization of injection molding and cooling stage, the curing ejection molding plastic products, mass products manufactured in this cycle the processing steps.Molding cycle according to different part complexity and size can be from a few seconds to a few minutes.

The advantage of plastic injection molding

• For mass production, unit price is more competitive
• The production cycle of injection molded products is very fast
• Suitable for many different kinds of substrates
• Surface quality of the products have many kinds of polishing and texture effect to choose from
• Selection of thousands of kinds of plastic injection molding materials with all kinds of engineering properties and appearance
• Fast turnaround

Step 1: Clamping
Prior to the injection of the material into the mold, the two halves of the mold must first be securely closed by the clamping unit. Each half of the mold is attached to the injection molding machine and one half is allowed to slide. The hydraulically powered clamping unit pushes the mold halves together and exerts sufficient force to keep the mold securely closed while the material is injected.

Step 2: Injection
The raw plastic material, usually in the form of pellets, is fed into the injection molding machine, and advanced towards the mold by the injection unit. During this process, the material is melted by heat and pressure. The molten plastic is then injected into the mold very quickly and the buildup of pressure packs and holds the material.

Step 3: Cooling
The molten plastic that is inside the mold begins to cool as soon as it makes contact with the interior mold surfaces. As the plastic cools, it will solidify into the shape of the desired part.

Step 4: Ejection
After sufficient time has passed, the cooled part may be ejected from the mold by the ejection system, which is attached to the rear half of the mold. When the mold is opened, a mechanism is used to push the part out of the mold. Force must be applied to eject the part because during cooling the part shrinks and adheres to the mold. In order to facilitate the ejection of the part, a mold release agent can be sprayed onto the surfaces of the mold cavity prior to injection of the material.