国产精品自产拍在线观看首页_国产美女遭强高潮开双腿_亚洲日本文字天天更新_国产美女高潮久久久久白浆,国产精品亚洲一区二区三区天天看|久久久综合九色综合|欧美日韩精品视频一区二区在线播放|亚洲小视频在线观看

When the surface of PVC plastic pipe is Matt, the reasons are as follows:

The first reason may be that the die temperature is too low, which can be treated by increasing the die temperature and adding ACR dosage to improve the shearing;

The second reason may be that the shear rate is too high and the melt breaks. We can solve this problem by properly increasing the feed temperature, increasing the amount of ACR or decreasing the traction speed;

The third reason may be that the die temperature is too high or the internal surface finish is poor. We can solve this problem by reducing the die temperature and its roughness;

The fourth reason may be that the plasticizing of plastic additives is poor. We can solve this problem by improving the temperature and adding processing additives;

The fifth reason may be that the content of external lubricant is too low. We can properly add external lubricant. Of course, this is to ensure that the material is plasticized;

Sixth, perhaps because the particle size of CaCO3 is too large or the particle size distribution is too wide, now we can replace the applicable calcium carbonate to deal with this problem.

Article source: PVC engineering plastics http://www.lyx0.com/