What is Plastic Injectiong Moudling Process?

Injection moulding is a manufacturing process for producing parts by injecting molten material into a mould or mold. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called die-casting), glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers. Material for the part is fed into a heated barrel, mixed (using a helical screw), and injected into a mould cavity, where it cools and hardens to the configuration of the cavity, After a product is designed, usually by an industrial designer or an engineer, moulds are made by a mould-maker (or toolmaker) from metal, usually either steel or aluminium, and precision-machined to form the features of the desired part. Injection moulding is widely used for manufacturing a variety of parts, from the smallest components to entire body panels of cars. Advances in 3D printing technology, using photopolymers that do not melt during the injection moulding of some lower-temperature thermoplastics, can be used for some simple injection moulds.

Surface Finish Options

Draft angle requirements will vary by requested finish. Industry standard Mold-Tech finishes are also available.            

 What's main  defect of injection molding?

The complexity of the injection molding process, and the interdependence of the many variables involved, means that any molding defect may have several different causes, of which more than one may be present at any given time

Problem	Possible Causes	Picture
Sink Marks	Melt temperature too high Insufficient material injected Insufficient dwell time Premature gate freezing Sharp variations in wall thickness Wrong gate location Part ejected too hot Cavity pressure too low
Voids	Volatiles from overheated material Condensation on granules Premature freezing of flow path to thick section
Flow marks	Melt temperature too low
Weld lines	Incorrect gate location mold temperature too low
Burn marks	Incorrect filling pattern
Warping	Melt temperature too low Incorrect part design Overpacking near gate Sharp variations in wall thickness Flow length too great Unbalanced multiple gates Part ejected too hot Inadequate or badly located ejectors Temperature variations between the mold halves

Some Case From Xiamen wiesel Technology co.,Ltd