原则一

Principle one

注意配方中润滑的内外平衡，适应前期、中期和后期各阶段对物料润滑性的要求，达到润滑平衡的一致性和长期性。

Attention should be paid to the internal and external lubrication of the formulation, so as to meet the requirements of material lubrication at all stages of the beginning, middle and late stages, and achieve the consistency and long-term nature of lubrication balance.

外润滑剂过多，挤出速度快，物料易生、塑化不好。内润滑剂多，挤出量大，物料塑化虽好，但初期润滑效果不好挤出扭矩偏大。

The external lubricant is too much, the extrusion speed is fast, the material is easy to produce and the plasticization is not good. There are many internal lubricants, large extrusion quantity and good material plasticizing, but the initial lubrication effect is not good.

当后期润滑不足，则会导致螺杆均化段、压缩段、口模段润滑不足，物料剪切剧烈，影响型材的表面质量及内在性能，严重时还会造成分解。

When the later lubrication is insufficient, it will cause the screw homogenization section, the compression section and the die section to lubricate insufficient, the material shearing will be intense, will affect the surface quality and the intrinsic performance of the profile, and will also cause the decomposition when serious.

一般将润滑剂的熔点和加工温度结合来判定润滑剂在配方中初期、中期和后期的润滑性。

The lubrication of lubricants in the initial, middle and late stages of the formula is generally determined by the combination of the melting point of the lubricant and the processing temperature.

原则二

Principle two

在满足需要的前提下，润滑剂应维持最小用量。

On the premise of meeting the needs, the lubricant should maintain the minimum amount.

虽然润滑剂在配方中具有重要作用，但不是用量越多越好。润滑内外平衡，是在一定限度内的平衡。由于润滑剂与PVC树脂相容性有限，过多加入会对PVC体系产生不良影响。许多加工及热稳定性问题，都有可能是润滑剂过量造成的。

Although lubricants play an important role in the formulation, they are not the more the better. The internal and external balance is the balance within a certain limit. Because the compatibility of lubricants with PVC resin is limited, too much addition will have a bad effect on the PVC system. Many problems in processing and thermal stability may be caused by excessive lubricants.