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當前位置：首頁 > 新聞資訊 > 制约PVC發泡板生产的因素

制约PVC發泡板生产的因素

文章出處：南京歐格人氣：发布时间：2019/7/2 10:26:12

在PVC發泡板生产过程中，常出现以下这4类的问题：稳定性、熔体强度、润滑和分散问题。这些问题相互制约，相互影响，以下是对这四类问题的详细介绍。

PVC發泡板

1.穩定性不足，會影響整個板面，板面發黃，發泡片材脆性大。

2.熔體強度不足會導致發泡片泡孔大，縱切面泡很長。在發泡管材中要想獲得發泡均勻制品，也需要保證PVC物料有良好的融體強度。所以發泡調節劑的質量和型號至關重要，當然黃白發泡劑也要配合好。

3.潤滑劑。潤滑劑分爲外潤滑劑和內潤滑劑，外滑有利于脫模，對板材表面的光潔性有好處，外滑太少，擠出機5區溫度不易控制，易升溫，這會導致合流芯溫度高，板材中間出大泡、串泡、發黃等問題，板材表面也不光滑；外滑多，析出會變得嚴重，表現在模具內的結構和板材表面外滑的析出，也會表現爲某些個別現象在板面上不定期的來回移動。

分散不好會帶來板材表面不光滑的現象。溫度提高也會導致熔體強度降低，發泡片材泡孔增大，泡孔數量減少，片材發脆易斷裂；溫度提高，降低了熔體強度也會降低熔體粘度，粘度降低剪切分散能力降低，對分散能力不強的螺杆而言，有時會出現分散不均勻。

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