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How to design low foamed plastic parts
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| Time：2013.10.08 News Sources：Dongguan Zhongyu precise Mold Co., Limited Views： |
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| Low foamed plastics is a kind of foam, but the lower rate of foam plastic, the following requirements of the injection molding: wall thickness shall not be less than 5mm, can reduce the core material, foam density, in the design of plastic parts should be considered when the thick wall products because of the cooling time limit and affect the appearance quality products. Because the flow path of different lengths, wall thickness change will affect the distribution of foam. Where in the core without foaming material and wall thickness is different, can appear the depression, in the conditions of wall thickness should be uniform. Plastic pattern design surface can be leather, linen texture or pattern pattern pattern. Because the number, gate in the molding of plastic parts wall thickness and geometry is different, so it is difficult to have the same pattern and clear pattern. Some of the demands of patterns on the surface quality of plastic parts, special attention should be paid to the location of the gate, when necessary, polishing, painting and other surface treatment. In the design of foamed plastic gate, should make the longest and shortest flow passage parts differences as small as possible, and the layout is reasonable, the molten material can be uniformly filled cavity. The gate should be close to the flow resistance, because it can make the foam more uniform distribution. In the injection molding process, through a plurality of runner and gate plastic injection in a plurality of gate piece also is feasible, at the confluence of the weld line is very small, the injection from the middle position of the sprue, runner cone diameter should not be less than the wall thickness of plastic parts, in order to avoid the rapid injection jet. Fillet radius foaming injection molding products are generally not less than 3mm, this is because even the mould made into an acute angle, in the molding process, due to the relationship between foaming gas, plastic parts can not form the edges and corners. Because the strength of the weakest in the corner edge, so both the design of low foamed products or high precision of foam products, should pay attention to the radius of the round design, design should be large, in this way, not only the high mechanical strength, but also looks beautiful |
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