Darmstadt University of Applied Sciences in Germany and Mold specialist MHT conducted a publicly funded research project to determine how hot-runner design affects PET preform quality.Researchers examined thermal degradation and decomposition of PET material in the mold,which can lead to dust that impedes valve-needle movement and must be suctioned out.The project's goal was to prevent the dust from developing at all.The researchers said that part of the issue is that many manufacturers combine an existing hot half,with a mold pitch of 50 x 140 mm,with matching cold sides of different contour.The result is the same hot runner must supply preforms ranging in weight from 6 to 40 g and lengths of 30 to 150 mm.
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机译：达姆施塔特大学在德国和模具专家MHT进行了一项公开资助的研究项目，确定热流道设计如何影响PET预制件质量。研究人员在模具中检查了PET材料的热劣化和分解，这会导致阻碍阀门的灰尘 - 终止运动，必须抽出。该项目的目标是防止尘埃在发展中。研究人员表示，该部分问题是许多制造商结合了现有的热半，模具间距为50 x 140 mm， 匹配不同轮廓的冷侧。结果是相同的热流道必须提供重量的重量，重量为6至40克，长度为30至150 mm。
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