Three-way bracket injection molding

Material:PVC

What is injection molding?
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. 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.

Typical application range of PVC (polyvinyl chloride):
Water supply pipes, household pipes, house wall panels, commercial machine housings, electronic product packaging, medical equipment, food packaging, etc.

PVC (polyvinyl chloride) injection molding process conditions:
Drying treatment: usually no drying treatment is required.
Melting temperature: 185~205℃
Mold temperature: 20~50℃
Injection pressure: up to 1500bar
Holding pressure: up to 1000bar
Injection speed: In order to avoid material degradation, a considerable injection speed is generally used.
Runners and gates: all conventional gates can be used. If processing smaller parts, it is best to use needle-point gates or submerged gates; for thicker parts, it is best to use fan gates. The minimum diameter of needle-point gates or submerged gates should be 1mm; the thickness of sector gates should not be less than 1mm.

The chemical and physical properties of PVC (polyvinyl chloride):
Rigid PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material. In actual use, PVC materials often add stabilizers, lubricants, auxiliary processing agents, pigments, impact resistance agents and other additives. PVC material has non-flammability, high strength, weather resistance and excellent geometric stability. PVC has strong resistance to oxidants, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid and is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons. The melting temperature of PVC during processing is a very important process parameter. If this parameter is not appropriate, it will cause the problem of material decomposition. The flow characteristics of PVC are quite poor, and its process range is very narrow. Especially the high molecular weight PVC material is more difficult to process (this kind of material usually needs to add lubricant to improve the flow characteristics), so the PVC material with small molecular weight is usually used. The shrinkage rate of PVC is quite low, generally 0.2~0.6%.