相關標簽：德國蓋爾 POM、美國Technical POM、日本東麗 POM塑膠原材料、耐候 POM、抗紫外線 POM、模塑 POM塑膠原材料
聚甲醛注塑有流跡紋怎么辦？
在POM原材料的注塑成型中，這種缺陷的表現是銀或水條紋。銀色條紋有許多同義詞，用以描述產品表面上的白色或銀色標記，條紋（通常沿流動方向）或氣泡。為了解決此缺陷，了解其真正原因非常重要。可能的原因如下：水分（例如，POM原料干燥不足或模具冷卻部件泄漏）·空氣（熔融樹脂中可能殘留或混入一定量的氣體：如果?在注入POM原料期間無法排出氣體，它將延伸到產品表面）·由于1引起的材料分解。POM原料長時間留在料筒中，進料筒被污染，熔化溫度太高，或與色粉/色母不兼容。
2.剪切速率太高，尤其是在澆口附近。為了避免由分子鏈斷裂引起的分解，未熔融的POM不應超過40000s-1，增強的KEPITAL等級不應超過20000s-1。注射成型系統中的恒定剪切速率：·γ=3n1）（3nr××+πQ（圓形截面積）·γ=2）13（2nwhn+（矩形截面積）·γ剪切率[s-1]，n-在較高剪切速率下的粘度降低指數（通常是KEPITAL材料：0.35-0.39），Q計算該區域的流速，例如澆口，噴嘴[cm3/sec]，R圓形截面半徑[厘米]，w-矩形界面寬度[cm]，h-矩形界面高度[cm]·污染（特別是對于熔點較低的聚合物。在同一工廠使用PVC材料時，應特別注意，因為其分解產物PVC將加速POM分解）。
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| 其它 其它 注塑,擠出 | |
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