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1、须状斑纹须状斑纹 GateGate brushbrush（1 1） 何谓须状斑纹（外观）何谓须状斑纹（外观）WhatWhat isis GateGate brushbrush ? ? (appearance)(appearance)？ 须状斑纹是指在 Duracon 中常见的、浇口附近的小流痕。Gate brush is small flow mark near gate. It is common mark on Duracon mold pieces.斑纹本身很薄，难以拍摄，如右图所示。*That mark is shown by a right diagram because this
2、mark is pale and difficult to take photograph 图 1. 须状斑纹的模式图 Figure.1 Gate brush mark 2 2）须状斑纹的生成原因）须状斑纹的生成原因(2)(2) CausesCauses ofof GateGate BrushBrush FormationFormation (2-1) 流动样式的变化(2-1) Change of flow pattern 从浇口出来的树脂通常是按左边的样式来填充的，而当按右边的样式流动时便会产生“须状斑纹”。就成型条件而言，在下列情况下容易产生须状斑纹：Resin flowing out o
3、f a gate is normally filled in a mold by the pattern shown in the left figure, but when the resin flows by the right pattern, it is considered to form gate brush. It is proved that gate brush is liable to be formed by the following molding conditions: （1）模具温度偏低 Low mold temperature,（2）注射速度偏快 ) Fast
4、injection speed, （3）浇口尺寸偏小 Small gate size （4）材料流动性偏低 Low flowability of material, and so on.(图 2. 产生须状斑纹的流动状况 Figure.2 Flow pattern near the gate 3 3）须状斑纹的对策）须状斑纹的对策 CountermeasuresCountermeasures againstagainst gategate brushbrush(3-1) 改善浇口处的流动状况 To smooth flow at the gate体来说，可采取下列对策：Specifically,
5、 the following countermeasures are taken:（1）提高模具温度 To raise mold temperature,（2）降低注射速度（通过浇口时）To reduce injection speed (in passing gate)（3）扩大浇口 To expand gate（4）改用流动性好的等级 To switch to a grade of better flowability. 要降低通过浇口时的速度，请最好采用多级注射 Use of multistage injection is recommended to reduce the gate passing speed。另请参阅下述推荐成型条件以免形成极端成型条件
