By Tony Whelan, John Goff (auth.)
Over the years 1984 to 1989, we released a sequence of articles at the molding of thermoplastics, and of thermosetting fabrics, within the per thirty days journal British Plastics and Rubber (B P & R). those articles have been rather well got and we additionally acquired quite a few requests for reprints. The articles have been additionally translated into languages except English. as a way to cater for what's evidently a necessity in either the ther moplastics, and the thermosetting, molding industries, we there fore introduced the knowledge jointly and produced it in publication shape. To make the fabric more uncomplicated to address we produced it within the type of a number of books and this is often certainly one of them. we will purely desire that the knowledge so awarded, serves you good and that you just locate the data priceless. We in flip want to thank the editor of the journal B P & R for supporting us during this subject. thank you also are as a result of our many associates and associates during the molding for his or her priceless support and suggestion: specifically, the corporate Moldflow (Europe) constrained deserve a unique point out as they allowed us to extract details from their huge information base.
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Additional resources for Injection Molding of Thermoplastic Materials - 2
5% butyl stearate) or slip/antiblock additive (oleamide or stearamide) can either be added in the form of a powder or masterbatch, for example, by tumble blending. g. zinc stearate or PTFE spray, can be applied to the surface of the mold so as to prevent component sticking. However, the use of silicone based release agents should be avoided as stress cracking can occur to the moldings. l18in) wide. As EVA tends to flow very easily (more easily than PE-W) it is essential that the correct size vents are used otherwise flashing will readily occur.
2% water in 24 hours at room temperature. This means that drying is not normally necessary. If it is, dry in a hot air oven for 8 hours at 50 to 60°C (122 to 140°F), in a desiccant dryer for 4 hours at 50 to 60°C (122 to 140°F). The actual drying temperature is dependent upon the amount of vinyl acetate incorporated, for instance, a drying temperature of 50° C (122° F) should be used for materials that contain 33% or more vinyl acetate and 60°C (140°F) for compounds that contain less than 33%. Normal material handling techniques such as a hopper loader are readily used with EVA However, when pneumatically transporting this material wer long distances the design of the handling system must accommodate the low surface hardness and the low softening point of EVA 14 Mold and Gate Considerations A suggested mold temperature is 25°C (77°F).
54 15 Flow Path: Wall Thickness Ratio For general purpose grades this is approximately 200 to 250:1 but ;t can reach 290 to 300:1 for easy flowing grades. 5tsi. 5MNm-2) is sufficient. 17 Cylinder Equipment General purpose screws can be used ,for example, with an L:D ratio of about 20:1 and a constant pitch of lD. 5:1 will be sufficient. The screw is usually fitted with a non-return valve but, valves are not essential on the nozzle unless high back pressures are involved. The best results have been obtained with spring loaded or hydraulically operated types; decompression or suck back is also used.
Injection Molding of Thermoplastic Materials - 2 by Tony Whelan, John Goff (auth.)