By Tony Whelan
During the years 1987 and 1988 we released a sequence 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 a number of requests for reprints. which will cater for what's evidently a necessity within the thermoplas tics molding undefined, we as a result introduced the data jointly and produced it within the kind of a booklet. we will basically desire that it serves you good and that you simply locate the knowledge important. We in flip wish to thank the editor of the journal B P & R for assisting us during this subject. thank you also are as a result of our many neighbors and co-workers through the molding for his or her helpful support and suggestion, particularly the corporate Moldflow (Europe) constrained deserve a unique point out as they allowed us to extract info from their wide information base.
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Extra resources for Molding of Thermosetting Plastics
For optimum properties, post-bake for 8 hours at 135°C/ 275° F, then raise the temperature at 10° C/18° F, per hour until a temperature of 215° C/419° F is reached. The improvement 49 in properties may, however, be marginal if the molding conditions have been optimized. EMC is not usually decorated, but decoration can be carried out in the form of hot foiling, stencilling or silk screening. Quick setting paints are often used to fill in recessed lettering in order to highlight logos, etc. 19 Other comments Epoxies are probably best known as good adhesives, for example, Araldite.
Moving cores, that are incorporated in molds, should be designed with minimal clearance and adequate support so as to prevent the formation of flash; this will cause seizure or sticking during side core movement. 12 Ease offlow Injection pressures of up to 200 MNm-2 (29,000 psi) are usually provided on thermoset injection machines. Because of the easy flow characteristics of DMC (BMC is much thicker), lower pressures of around 35 MNm-2 (5,075 psi) may be used. Machines may therefore be fitted with large capacity injection units - which is useful as DMC components are of heavy cross-section and need a large shot weight.
New improved injection molding grades have excellent color retention when exposed to heat and sunlight and, can now be considered for use at continuous temperatures of up to 130°C, or 266°F, in wet and dry conditions. Due to the low viscosity, of this type of grade, the manufacture of large and complex articles is possible. Apart from better processability, such grades give high gloss, improved impact resistance and, a lower postmolding distortion. 7 Forms Supplied Usually supplied as granular powders which have a bulk density of about 2:1.