Shrinkage of Buy Big size injection mold Manufacturers china
Release time:
2023-03-30 13:12
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Buy Big size injection mold Manufacturers china tells you that during the period when the plastic part is taken out of the mold and stabilized, there will still be slight changes in size. Buy Big size injection mold Manufacturers china tells you that one variation is continued shrinkage, this shrinkage is called post-shrinkage. Another variation is that some hygroscopic plastics swell due to moisture absorption.
Buy Big size injection mold Manufacturers china tells you that for example, when the water content of nylon is 3%, the size increase is 2%; when the water content of glass fiber reinforced nylon is 40%, the size increase is 0.3%. But it is the forming shrinkage that plays a major role.
Buy Big size injection mold Manufacturers china tells you that the current method of determining the shrinkage rate of various plastics (forming shrinkage + post-shrinkage), that is, the size of the mold cavity at 23°C±0.1°C and the size of the mold after forming for 24 hours, at a temperature of 23°C °C, and the relative humidity is 50±5% to calculate the difference between the corresponding dimensions of the plastic parts.
Buy Big size injection mold Manufacturers china tells you that the shrinkage rate S is expressed by the following formula: S={(D-M)/D}×100%. Among them: Are s-shrinkage rate; D-mold size; M-plastic part size. If the mold cavity is calculated according to the known plastic part size and material shrinkage rate, it is D=M/(1-S). In order to simplify the calculation in mold design, the following formula is generally used to find the mold size: D=M+MS. If a more precise calculation is required, the following formula should be used: D=M+MS+MS2.
Buy Big size injection mold Manufacturers china tells you that when determining the shrinkage rate, since the actual shrinkage rate is affected by many factors, only approximate values can be used, so the calculation of the cavity size with the formula basically meets the requirements. When manufacturing the mold, the cavity is processed according to the lower deviation, and the core is processed according to the upper deviation, so that it can be properly trimmed if necessary.
Through the above introduction and analysis of Low price Dec Tape manufacturers, hope it helps you.
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