Page 64 - 2019-10

橡塑技术与装备（塑料） CHINA RUBBER/PLASTICS TECHNOLOGY AND EQUIPMENT (PLASTICS)

料带出后，形成的杂质。要想解决此类黑色晶点问题， 状规整的，近似圆形的 , 没有拖带痕迹的晶点 ；另一
需要排查设备，尤其是挤出机等有死角的设备。 类是形状不规整，有拖带痕迹的晶点 ；第三类是形状
不规整的黑色晶点。按照不同分类，找到晶点出现的
原因 , 并根据原因寻找出解决方案。本文产生晶点的
原因 , 一个是原料原因 , 黄色杂质较多，导致片材中圆
形黄点较多 ；一个是加工配方原因，配方的耐热性变
差，导致片材产品中出现不规则、有拖带痕迹的晶点。
另一种原因是加工时外来引进的杂质，主要跟生产的
工艺条件有关系。以此为例，希望在解决硬质 PVC 压
延片材中的晶点问题方面，能够提供实例帮助。

图 7 塑化流变曲线图
参考文献 ：
［1］ 潘祖仁 , 邱文豹 , 王贵恒 . 塑料工业手册：聚氯乙烯分册［M］.
3 结论 北京 ：化学工业出版社，1999:705.
本文对 PVC 片材中的 “ 鱼眼 ” 或晶点进行研究。 ［2］ 毕新安 . R-PVC 透明片材成型工艺及生产应用 [J]. 塑料包装，
并将片材中晶点进行分类，主要分为三类 , 一类是形 2003,13(3):43~44,37.

A brief talk on the solution of "fisheye" in PVC sheets

Kong Yang

(Zhenjiang Liancheng Chemical industry Co. LTD, Zhenjiang 212001, Jiangsu, China)
Abstract: In this paper, the fisheye of PVC sheet was studied. In order to facilitate the study of fisheyes
in sheets, this paper classifies the fisheyes in sheets according to the types of fisheyes encountered in
the treatment of sheets, which are mainly divided into three categories: one is regular, nearly circular,
without traces; the other is irregular, with traces; the third is irregular black fisheyes. According to different
classifications, this paper finds out the causes of fisheye, and finds out the solutions according to the causes.
The reason of fisheye in this paper is that there are many yellow impurities in raw materials, which lead to
more circular yellow spots in the sheet. The reason of processing formula is that the heat resistance of formula
is poor, which leads to irregular and trailing fisheyes in sheet products. Another reason is that the imported
impurities during processing are mainly related to the technological conditions of production.
Key words: PVC; sheet; fisheye; impurity
（R-03)

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