About External Lubricant
When compared with Internal lubricants, having high molecular weight and compatibility with the resin is less. This helps to reduce the adhesion between PVC and metal surfaces of the equipment while improving the surface gloss, preventing sticking and burning of plastic material, delaying gelation and helps in improving releasing properties.
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FAQs
What are External Lubricants?
External lubricants are additives that reduce friction between the molten PVC and processing equipment surfaces.
Why are External Lubricants important?
They help:
- Prevent sticking to molds and dies
- Improve surface smoothness
- Reduce equipment wear
- Ensure smooth extrusion
Where are External Lubricants used?
They are widely used in:
- PVC pipe manufacturing
- Profile extrusion
- Sheet production
- Moulded plastic products
Do External Lubricants affect fusion time?
Yes. They can slightly delay fusion, which helps control processing and improve surface quality.
What is the difference between Internal and External Lubricants?
Internal Lubricants reduce friction inside the material. Lubricants reduce friction between the material and machine surfaces.
Both work together to improve processing performance.