PBT masterbatches are used in the production of POY&FDY:

Key points:
1. The low viscosity process:
PBT has a lower viscosity than PP, so a specially designed screw is required.
- Use a small extruder to ensure minimum clearance between screw and barrel and improve mixing efficiency.

2. Raw material preparation:
- Pre-mixed with powdered PBT to ensure the pigment is evenly dispersed.
- The pre-mixing process needs to be carried out in a separate room with a dust removal system.

3. The vacuum system:
- A powerful vacuum system is used to remove moisture and reduce the reduction of intrinsic viscosity (IV).

4. Three screw extruder:
- provide better dispersing pigments three screw extruder and higher output.
- by a mixture of 40% extra free volume and extra screw, mixing effect is better.

Production steps:
1. Pre-mix:
- in a separate room, premixed powder PBT, and pigments.
- Use a powerful vacuum system to remove water.

2. Squeeze out:
- Mixing and melting using a three-screw extruder.
- The powerful vacuum system continues to remove water during the extrusion process.
- by water-cooled brace granulation system will eventually material particles.

3. Quality control:
- Test and ensure that the color uniformity, mechanical properties and water content of the final masterbatch particles meet the requirements.

In SUMMARY:
- Use of three-screw extruders: ensure better pigment dispersion and higher production efficiency.
- Pre-mixing process: carried out in a separate room to maintain cleanliness and prevent contamination.
- Powerful vacuum system: effectively removes moisture and maintains PBT performance.

This method ensures the production of high-quality PBT masterbatches suitable for POY and FDY production.