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Mr.Cheng 13925299144(English,Japanese) |
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which are the main factors of plastic
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| Time：2013.10.07 News Sources：Dongguan Zhongyu precise Mold Co., Limited Views： |
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| Plastic shrinkage on the quality of the products, mold design and manufacturing to bring great influence, therefore, the shrinkage rate factors should deeply know, generally have the following. 1 the molding pressure, the pressure of melt into the mold cavity after a fairly high, this kind of pressure makes the melt density increase, therefore, the cavity pressure is larger, forming the compressed smaller, non crystalline plastics and crystalline plastic shrinkage rate with the increase of internal pressure, respectively, in a straight line and curve shape decline. 2 injection temperature, the plastic in the solid into a liquid, as by heating, plastic raw materials in the heating process, the volume will be expanded, shrinkage rate increases; but on the other hand, due to the increase in temperature, prolong the gate closed time, into the melt in the cavity increases, density increased, the shrinkage decreases, both at the same time is generally the result of: shrinkage decreases with the increase of temperature. 3 types of gate, gate type directly affects the flow process of mould filling, and thus affects the shrinkage rate, which is the main gate section size. Gate large section size is helpful to improve the cavity pressure and the extended gate closed time, facilitate more melt into the cavity, so it has a greater density, shrinkage rate decreased with the. 4 mold temperature, lower mold temperature, the melt solidification mold cavity wall portion of the faster, the solidified layer wall thickening rapidly, the rapid solidification molding of plastic parts, plastic parts of the shrinkage rate will decline. The 5 part thickness, crystalline plastic shrinkage rate increased with the increase of the wall thickness of plastic parts. In the non crystalline plastics, the rate of contraction and different, ABS, PC and other plastic shrinkage rate is not affected by the wall thickness; PE, SAN and other plastic shrinkage increases with the thickness increasing; HPVC contraction rate was increased with the increase of thickness and decrease. |
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