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Gas-assist injection
molding is a process that utilizes an inert gas (normally nitrogen) to create
one or more hollow channels within an injection-molded plastic part. At
the end of the filling stage, the gas (N2) is injected
into the still liquid core of the molding. From there, the gas follows the
path of the least resistance and replaces the thick molten sections with
gas-filled channels. Next, gas pressure packs the plastic against the mold
cavity surface, compensating for volumetric shrinkage until the part solidifies.
Finally, the gas is vented to atmosphere or recycled.
Gas-assist injection molding has been around for well over two decades and
many people have had concerns over patent, rights and royalty fees. Within
the past few years, some of the original patents have expired. And now,
gas-assist injection molding is widely practiced. Design engineers and processors
alike are discovering that this technology is an attractive option for certain
applications and offers many benefits.
It is the responsibility of the manufacturer to ascertain
that their practice or technology is not covered by current patents.
Unless specified to the contrary, the values given have been established on standardized test specimens at room temperature. The figures should be regarded as guide values only and not as guaranteed minimum values. Kindly note that, under certain conditions, the properties can be affected to a considerable extent by the design of the mold/die, the processing conditions and the coloring.
The
manner in which you use and the purpose to which you put and utilize our
products, technical assistance and information (whether verbal, written
or by way of production evaluations), including any suggested formulations
and recommendations are beyond our control. Therefore, it is imperative
that you test our products, technical assistance and information to determine
to your own satisfaction whether they are suitable for your intended uses
and applications. This application-specific analysis must at least include
testing to determine suitability from a technical as well as health, safety,
and environmental standpoint. Such testing has not necessarily been done
by us. Unless we otherwise agree in writing, all products are sold strictly
pursuant to the terms of our standard conditions of sale. All information
and technical assistance is given without warranty or guarantee and is subject
to change without notice. It is expressly understood and agreed that you
assume and hereby expressly release us from all liability, in tort, contract
or otherwise, incurred in connection with the use of our products, technical
assistance, and information. Any statement or recommendation not contained
herein is unauthorized and shall not bind us. Nothing herein shall be construed
as a recommendation to use any product in conflict with patents covering
any material or its use. No license is implied or in fact granted under
the claims of any patent.
