How Does Injection Molding Work?



Worldwide, injection molding is the most common method of processing plastics.The cycle includes the infusion of warmed, condensed plastic into a temperature-controlled shape under high tension.

When the machine opens the mold, the plastic fills the mold, cools, and solidifies into finished parts that are simple to remove.

A “cycle” is the entire production process, from the closing of the mold to the injection “shot” to the opening and removal of the part.

Specialized injection moulding manufacturing machines that are sized in accordance with tons of mold clamping force are used for injection molding processing.

These may go from “miniature” IMMs of only a couple of tons that produce minuscule parts in little shape to exceptionally huge IMMs surpassing 3,000 tons of cinching force that can hold exceptionally enormous forms and make very enormous parts, for example, car front sash or guard covers.

What are the most common uses for parts made with injection molding?

Parts made with injection molding are used primarily for:

  • Parts for automobiles,
  • Electronics, packaging,
  • And beverage bottling.
  • Industrial parts, products,
  • And medical equipment.
  • Construction and building.

In the process of injection molding, what function does auxiliary equipment play?

Production of high-quality, high-volume parts is made possible by injection molding machines.

However, IMMs were unable to mold or produce anything without the assistance of their surrounding auxiliary equipment please visit

Take a look at it.Auxiliary equipment is necessary for:

  • Ensuring accurate and reliable temperature control for product quality and energy efficiency as well as maintaining process consistency over long production periods
  • Proper removal and handling of finished parts
  • Efficient management and re-use of scrap material
  • Delivering materials to injection molding machines without contamination or moisture regain

Auxiliary Equipment for Injection Molding Processing

Pre-Injection Molding Storage

The delivery of materials by railcar, truckload, or Gaylord marks the beginning of the process.Specialized auxiliary equipment, such as railcar or truck unloading systems, are frequently required for the transportation of massive bulk deliveries of material.

These systems need to be able to quickly take in huge quantities of resin, move it over distances of up to 1,000 feet, and then lift it high enough to quickly fill large storage silos of material.

A cycling loader, on the other hand, can push or pull bulk material quantities over shorter distances as needed to move smaller loads and fill smaller surge bins.

Vacuum conveying systems are used by processors to move material (virgin pellets, post-consumer recycled pellets, and regrind) from in-plant storage locations to molding machines and auxiliary equipment like dryers or blenders.

A vacuum pump provides the power for these systems, which frequently include a network of conveying lines throughout the plant;valves, material loaders, and receivers;automated controls, line proofing systems, and resin selection tables


Systems must not only move the required quantities of material to the appropriate locations in order to provide value to a plastics processor, but they must also do so without damaging the material (such as pellet breakage, dust/fines, pellet smearing, angel hair, streamers) due to excessive or uncontrolled conveying speeds.

Angel hair and streamers, dust or fines from broken pellets or flakes, waste valuable materials and cost processors money in two ways.

First, this damaged material must be disposed of as trash because it is frequently trapped in conveying system filters (just six pounds per day equals one ton of material per year!).

Second, angel hair or dust/fines that get into the IMM plasticating barrel typically heat up and melt much faster than pellets that haven’t been damaged, leaving burned or blackened specks that can make parts look bad.

Consider switching from older dilute-phase conveying systems to a slower-speed dense-phase conveying system like Conair Wave Conveying if you want to move a lot of materials at china furniture factory speeds to avoid damage.

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