Injection Molding of Thermoplastics Materials — 1 by Tony Whelan, John Goff (auth.)

By Tony Whelan, John Goff (auth.)

During the years 1987 and 1988 we released a chain of articles at the molding of thermoplastics fabrics within the journal British Plastics and Rubber (B P & R). those articles have been rather well got and we additionally obtained lots of requests for reprints. as a way to cater for what's evidently a necessity within the thermoplas­ tics molding undefined, we consequently introduced the knowledge jointly and produced it within the type of a publication. we will be able to merely wish that it serves you good and that you simply locate the knowledge worthwhile. We in flip want to thank the editor of the journal B P & R for assisting us during this subject. thank you also are because of our many pals and co-workers in the course of the molding for his or her precious aid and suggestion, specifically the corporate Moldflow (Europe) constrained deserve a unique point out as they allowed us to extract info from their huge info base.

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The variety and types of systems available nowadays are numerous and therefore one should discuss in detail, with the hot runner, and insulated runner specialists, the requirements/quality of product to be manufactured from a particular polymer. This is necessary in order to ascertain which system will be best suited to a particular job. It is a well known fact that detailed investigations carried out at the design stage, concerning runnerless type molds, save considerable production problems. When long sprues and/or runners are being molded, then the use of a runnerless mold can speed up cycle times as the mold opening and closing movements may be shortened considerably: as the sprue and runners are the thickest part of many moldings, their elimination can also save on cycle time by reducing the mold cooling time.

Dry colors are widely used with PS, and it is customary to add a binder (for example, liquid paraffin or a mineral oil), to stop separation. External lubricants can also improve dry powder adhesion. Generally 30 ml. 1lbs) of material and the mixture tumble blended prior to colorant addition (the dosage may need to be doubled if the pigment loading is high or the pigment is of a low density). 8 ozs) (for white). The amount of colorant required is dependant upon the strength of the dye stuff or the denseness of the final color required.

COMPUTERIZED MOLD DESIGN The standard or quality of moldings is ever increasing and the need to accurately predict the material's flow and cooling characteristics within the mold cavity is becoming a necessity. The advent of computer aided mold design has made this task much easier enabling detailed analyses to be carried out for a range of processing conditions and, for a range of gating positions. The results of such analyses enables molds to be designed and manufactured knowing that a successful component will be produced with the minimum of debugging and that target dates can be met.

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