Gas and Water Assisted Moulding

Assisted Injection Moulding (AIM) is part of a family of technologies that are operated with plastics processing methods to improve product quality and significantly reduce cost.

The technologies include the injection of gas or water at high pressure into plastic in an injection mould.

What is Assisted Injection Moulding?

Assisted Injection Moulding (AIM) is part of a family of technologies that are operated with plastics processing methods to improve product quality and significantly reduce cost.

The technologies include the injection of gas or water at high pressure into plastic in an injection mould. This cores out sections of the part, leaving hollow areas. These reduce part weight and can provide much better distribution of packing pressure and eliminate sink marks. Gas can also be applied to the surface of a plastic part to replace moulding machine packing pressure with a uniform gas packing pressure, eliminating sink marks and reducing clamping force and often leading to lower part weight and cycle time.

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Compressor Stations

Maximator Compressor Stations are specially designed for the compression of nitrogen or carbon dioxide from gas bottles, and are employed for pressure generation in gas assisted molding applications.

Control Modules

Maximator Control Modules are suitable for series production with high-pressure nitrogen supply or high-pressure carbon dioxide supply, at a pressure of 500 bar (7,250 psi). The control modules regulate the injection pressure in the GID process.

Compressor-Control Module

Maximator Compressor Control Modules are suitable for mold trials and smaller production run applications with the gas assisted injection molding process with gas bottle supply. As a result of the integrated Maximator gas booster, the gas is compressed to the required pressure level and subsequently controlled to the required injection pressure using the pressure-control technology.

Water-assisted System

The MAXIMATOR Water Assisted System is suitable for assisted molding applications with water (WIT) in the area of assembly line production of component parts with large cross sections or channels. Considerably shorter cycle times and lower gas costs are a characteristic feature of this process variant.

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The short shot process

Injection phase

70% ± 20% of the volume of the cavity is dosed and injected.

According to process, the gas injection occurs via machine nozzle, injector modules in the sprue or in the molded piece.

Gas injection phase

This begins shortly before the termination of the injection phase, in order to avoid switchover markings.

Gas fills the cavity and drives the melt front forward.

Targeted hollow spaces form in the molded piece.

Gas hold-pressure phase

The gas pressure is retained after the complete filling of the cavity, until the molded piece is stable.

Relief of the gas pressure after solidifying of the melt.

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