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Compounding Polyvinyl Chloride (PVC): Introduction

The compounding of polyvinyl chloride, or PVC, involves storage, conveying, metering, mixing, and cooling. All of these operations take place prior to the actual melt compounding and each is a critical step in the process that can hurt product quality if not done properly. Problems that may arise and interfere with the smooth functioning of the compounding plant include contamination, segregation, mixer scale, line plugging, and off-spec production.

This section of Specialty Minerals Inc.’s web site contains a number of pages that deal with the technology of pre-blending and melt compounding rigid PVC. Click on one of these topics to go to that page:

  • How to Compound - discusses some of the basic aspects of melt compounding
  • Moisture – deals with this problem in all parts of the compounding operation
  • Flow and Handling  – provides some information to help solve problems in this area
  • Problem Solving –a general discussion about methods of investigating problems
  • Running a Trial  – covers procedures that will make a trial more productive


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