Plastic injection molding process involves using plastic, or polymer. The granular polymer is fed right into a heated barrel. Additionally it is further melted and mixed inside the barrel from the rotation procedure of a screw type plunger, as heat is generated from the friction between polymer granules when the screw is rotating.
The Auto plastic mold will then be forced in to a mold cavity with all the required final shape by way of a nozzle from the screw rotation action. The mold is pretty cold which might have cooling channels run through it. This will cause the molten polymer solidifies almost right after the mold cavity is filled. The solidified part together with the final required shape is going to be ejected out if the mold open again. It will probably be further cooled down through the ambient air.
Plastic injection machine is used to keep the mold set up as well as melt the plastic and inject it to the mold cavity.
Injection machine is classified by it tonnage. Tonnage is definitely the clamping force that the machine use to clamp the mold during injection molding process. It could be ranged from less than 10ton to 5000 tons, rely on part size and materials.
Another assortment of injection machine is be it single injection machine or double injection machine. For double injection machine, it is going to have 2 set of screw plunger, hoppers and nozzles.
In Electronic plastic mold, there injetion many common defect due to the process constraint and material properties.
Sink mark, short mold, wrap, silver streak, flow mark, flashes, weld line etc..
With better injection machine, material, skill and better parts design, such defect may be overcome with ease nowadays.