从油墨研磨的角度出发，分析油墨研磨过程中压力、水流量、时间因素对研磨出来的油墨质量的影响，进而分析其对胶印印刷品密度的影响。

This paper analyzed the effect of pressure, water flow, and time factors in ink grinding process on the grinding quality of ink, and then analyzed the influence to the offset printing density.

youdao

两种废料都要单独进行收集，即最常见的废料（PET-第一类）与高密度聚乙烯（HDPE-第二类）要分开收集，其余的废料会被投入一个混合塑料品垃圾箱。

The most common types, PET (type 1) and HDPE (type 2), are collected separately; the rest go into a mixed-plastics bin.

youdao

低密度的聚乙烯是PVC很好的替代品，它的生产过程相对简单，也不需要添加化学物质增加柔软性。

Low density polyethylene makes a nice substitute for PVC. It has a simple makeup and doesn't require additives to make it soft and pliable.

youdao