Plastic Injection Molding Service

Plastic Injection Molding is the most commonly used to produce plastic parts in the manufacturing industry. It is particularly used in mass-production processes to obtain the same product with high efficiency.

After the plastic injection molds are completed, we will turned it to our injection molding facility. At the moment, we have 15 sets of injection machines and 5 IPQC in house, which are available for plastic parts weight ranging from 0.5g~4.5KG.  All of our injection molded products are 100% inspected before mass production of final products. our quality control room are equipped with CMM, Projector, Micrometer, run-out tester, and other common measurement tools.

Our injection molding facility is mainly serving our product development demands, meanwhile we also provide plastic part manufacturing services. We welcome both product development and injection molding customers from worldwide clients

plastic injection molding facility

 The Plastic Injection Molding Process

  • Mold Closing

Prior to any injection molding, the injection mold tooling must be closed on the injection machine so as to fill plastic raw material into the mold. 

  • Material Injection 

A shot of raw plastic resin is filled into cavity of mold through the sprue and runner. then solidify the molten material on  the mold to obtain desired plastic product.

  • Cooling and Solidifying

It take seconds or minutes to cool down and solidify the injected material. Eventually the desired shape of dimension will be achieved.

  • Open Mold and Eject Plastic Product

It's the last movement to eject the plastic product from the mold tooling by ejection device. So that the plastic part will depart from mold tooling. 

 

The Main Defects of Plastic Injection Molding Product

  • Flash: Exceeded material from desired shape or dimension
  • Deformation: A plastic parts is deviation from horizontal direction compared to its original shape.
  • Flow marks: An outstanding pattern existing on the surface of plastic product, it normally result by slow injection speed.
  • Sink marks: The material reduction portion after the plastic product cools from mold tooling. Normally there will be a shrink mark on the surface a plastic product.
  • Short shot: It's caused by an injection speed or pressure that might be too low
  • Welding Line: It’s also called the juncture line where normally happens on round feature that two flow fronts meet and are unable to join together during the injection molding process.
  • Burn marks: Black or brown burnt areas on the part located at furthest points from gate or where air is trapped.
  • Cracks: Improper fusion of two fluid flows, a state before weld line.

The Common Material of Plastic Injection Molding

  • PC: PC(Polycarbonate) is a strong, tough, and durable( some of grade is transparent) engineering plastic material with very high impact resistance and high modulus of elasticity.
  • ABS: ABS(Acrylonitrile-Butadience-Styrene) is a very common engineering plastic material with high impact resistance, strength, and stiffness. It comes with low cost and easy for injection molding.  
  • PC+ABS:PC + ABS (Polycarbonate+ABS) is a very common thermoplastic engineering material, as it combines the excellent strength and heat resistance of PC and flexibility ABS.
  • PA:  it is one of the most widely used engineering thermoplastics with tough and abrasion-resistant
  • PP: PP (Polypropylene) is a normal tough and flexible thermoplastics polymer, made from the combination of polyethylene monomers. It is used in a variety of applications for engineering plastics
  • POM: POM is a very common engineering thermoplastic used in precision parts, it comes with high stiffness, low friction, and excellent dimensional stability.
  • PMMA: PMMA(polymethyl methacrylate) is one of the hardest thermoplastics material with excellent mechanical strength, low elongation, and highly scratch resistant.