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How Does Plastic Injection Molding Machinery Work?

Plastic Injection, Molding Plastic

how do plastic injection molding machines workAs seen in the diagram to the right, injection molding machinery is compromised of several fairly complex parts. This explanation of series and diagrams has been constructed to help you better understand plastic injection molding.

There are horizontal injection molding machines and vertical injection molding machines. White horizontal injection molding machines are very popular, vertical injection molding machines are very versatile and can save valuable floor space. A horizontal injection molding machine is pictured to the right.

Hopper

This serves as a funnel into the barrell. The hopper is where the plastics resin is placed for injection. Plastic resin can be compromised of flakes, shavings or pellets. The plastic resin can be fed manually, automatically or via vacuum.

Barrell, Injection Molding Screw, Heater Bands

injection molding screwThe injection molding screw has dual purpose in the function of an injection molding machine as it rotates, melts plastic and injects it into the mold. There are a series of bands (heater bands) around the barrel. The purpose of these bands is to keep the barrrel at an even temperature throughout the injection moulding process.

Clamping Unit & Platens

There are 2 platens in every injection molding machine. Platens are made of steel and each one holds half of the mold. The machine clamp opens and closes the mold.

Some popular types of clamps are hydraulic, rotary, single station.

Plastic Injection Molding Machinery

featured machine
Horizontal
Injection Molding
Brand: Engel Electric
Tonnage: 310 ton Electric
Shot Size: 23.8
featured machine
Horizontal
Injection Molding
Brand: Nissei
Tonnage: 398 ton FN7000
Shot Size: 33.8
featured machine
Horizontal
Injection Molding
Brand: Sumitomo
Tonnage: SH550 606 ton
Shot Size: 76.8
featured machine
Horizontal
Injection Molding
Brand: Sumitomo
Tonnage: SH450 496 ton
Shot Size: 60.7
featured machine
Vertical
Injection Molding
Brand: Newbury
Tonnage: 125 ton Vertical Rotary
Shot Size: 5
featured machine
Horizontal
Injection Molding
Brand: Sumitomo
Tonnage: 385 ton SH350A
Shot Size: 48.5
featured machine
Horizontal
Injection Molding
Brand: Husky
Tonnage: 1800 ton EW1650
Shot Size: 407
featured machine
Horizontal
Injection Molding
Brand: UBE
Tonnage: 1000 ton
Shot Size: 114.7


» View Our Online Inventory of Used Injection Equipment (Horizontal)
» View Our Online Inventory of Used Injection Equipment (Vertical)

Ejection System

This one is pretty self-explantory! The ejection system is how the part is removed from the mold.

Base

The base is what supports the injection molding machine. In addition to providing the proper supports, the base also houses many of the important components of the machine required to make it work.

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