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Article: Overcoming process control challenges of gas-assist injection molding.
- Article from:
- Plastics Engineering
- Article date:
- February 1, 1996
- Author:
CopyrightCOPYRIGHT 1996 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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New techniques employ self-calibrating needle valves to eliminate significant back pressure on the gas supply unit, thus avoiding conditions of choked gas flow.
The relatively new process of gas-assist injection molding permits molding of larger parts with projected areas or cross-sectional geometries that had not previously been possible. However, molders have raised concerns over controlling the injection of gas, and the plastics industry is attempting to establish logical techniques to overcome such processing challenges. Although gas injection equipment permits a number of adjustments, an optimum processing window must be established to provide control and ...