GAS ASSIST MOLDS    Gas Assist Molds Maker     Gas Assisted Injection Moulding     China Mold

 

Basic concept

Plastic forming process where a plastic melt is injected into a mold and where also a gas injected for pushing the melt towards the mold internal walls where the melt is solidified.

 

Tool features:

1. High requirements for part surface treatment.

2. thick wall thickness product.

Part function: Handle for Suitcase

Part Size: 162X151X16mm

Tool Size: 350X550X297mm

Part material: PP

Insert steel: ORVAR 8407 (H13 Equivalent)

Cav. QTY: 1X2

 

Gas Assist Molds Advantages

Less plastic material needed (material savings)

Reduced part weight (in some cases up to 40%)

Decreased cycle time

Increased part strength and rigidity

Reduced warpage and distortion

Improved part appearance (eliminates sink marks and surface blemishes)

Reinforces ribbed parts

Increased design options for complex parts, reducing multiple part assemblies, and metal to plastic conversions

Enables use of smaller plastic injection molding presses

In gas assist plastic injection molding, the pressurized gas follows the path of least resistance and displaces the plastic material in the thicker areas of the part, leaving hollow sections for reduced material use and part weight, yet not compromising part appearance or functional performance.

 

With gas assist molding, localized gas pressure within the mold results in better packing of the plastic which reduces warpage, shrinking, surface blemishes, sink marks and internal stress. Gas assist injection molded plastics generally make for stronger and more aesthetically pleasing parts.

 

Gas assist molding is used to reinforce ribbed parts and provides more design freedom for complex parts, reducing multiple part assemblies and metal to plastic conversions.

 

The need for less plastic material and the consistent pressurization within the mold also enable gas assist injection molded plastics to cool faster, reducing cycle times and increasing plastic injection molding machine output – saving time and cost!

 

In gas assist plastic injection molding, the internal pressure provided by the nitrogen gas enables lowering the outer force needed to hold part shape, so large plastic parts can be produced with less tonnage on smaller plastic injection molding machines.

 

Disadvantages

This molding technique is very difficult to apply for multi-cavity mold, especially if the cavity sizes are dissimilar. Clear or transparent plastic materials are an inappropriate option for this technique as cosmetic-appearance can deteriorate

 

Applications

Some applications benefiting from gas assist plastic injection molding include:

 

Appliance handles

Medical equipment housings

Interior and exterior automotive handles

Large covers and panels for office equipment

Lawn mower handles

Steering wheels

Basketball backboard frames

Long tubular shapes, such as shovel handles

Large parts with ribs and bosses

 

WIT Mold supply all kinds of molds, such as conventional plastic molds, precision injection molding, unscrewing molds, two shot injection molds etc., and are mainly exported to North America, Europe and other parts of the world.

 

https://witmold.com/product-item/gas-assist-molds-2/