Methods of gas assist injection molding

Today we'll discuss a new and innovative plastic molding technology: gas assist injection molding. Its principle involves injecting high-pressure nitrogen gas directly into the plastic being molded within the mold cavity via a main and auxiliary controller (segmented pressure control system). This causes the plastic part to expand internally, creating a hollow structure while maintaining the product's integrity and shape.

What are the methods of gas assist injection molding?

1. Closed Gas Injection Method: This method involves directly injecting gas into the mold cavity, creating a hollow plastic product. It eliminates the need for valves; simple mold processing is used to install gas nozzles within the mold. Single or multiple gas injection points can be used on the same mold.

2. Gas Injection Method from Injection Machine Nozzle: This involves installing a specially designed injection nozzle on the injection molding machine.

3. Surface Gas Forming Method: This is a patented technology of CINPRES GAS INJECTION LTD in the UK, suitable for producing mobile phones, electronic notebooks, and small household appliances.

Plastic injection molding technology has developed rapidly in recent years, with one development direction being the use of gas assist injection molding systems to improve product quality and cost-effectiveness. However, the limitation of internal gas assist injection molding technology is that it cannot be applied to planar injection molding with only one visible plane or with pillars and cross-sectional changes.

If you are developing large injection molding processing parts with thick-walled structures, a high-end appearance, or requiring lightweight yet high strength, you can consult the technical experts at Hejia Tech to discuss how to leverage this technology to enhance your products.