Improvements in or relating to methods of producing high-embossed plastic foil articles

  • Inventors:
  • Assignees: Joenkoeping Vulcan Ab
  • Publication Date: June 10, 1965
  • Publication Number: GB-994498-A

Abstract

A plastic foil is produced by adding a blowing agent to a plastic composition, spreading the composition over a backing, heating it, and compressing it with an engraving roller. The plastic may be polyvinyl chloride and may contain N,N1 - dimethyl - N,N1 - dinitroso - terephthalimide or azo dicarbonamide as blowing agent, a plasticizer, e.g. a phosphate, a stabilizer, a filler, e.g. SbO3, and a colouring pigment. The backing may be paper and may be treated with a releasing agent, e.g. a silicone composition, so that at the end of the process it may be separated from the foil. The foil may be heated to 180-200 DEG C. to foam it.ALSO:An embossed plastic foil is produced by adding a blowing agent to a plastic composition, spreading the composition on a backing, heating it to cause foaming and compressing it with an engraved roller so that it retains its cellular character only where it has been compressed least and so that the pores of the embossed surface are closed. The plastic composition may comprise 100 parts polyvinyl chloride, 50-70 parts of a plasticizer, e.g. a phosphate plasticizer, 5-15 parts of a pigment, 2-6 parts of a stabilzer, 5-10 parts of a filler, e.g. Sb2O3 and 2-6 parts of a blowing agent, e.g. N,N1-dimethyl-N,N1-dinitroso-terephthalamide or azo-dicarbonamide. The backing may be paper of 75 g./sq.m. and may be coated with 120-220 g./sq.m. resin. The foaming temperature may be 180-200 DEG C. The embossing roller may be cooled. In a continuous process the backing may be unwound from a roll, coated continuously with the plastic composition, passed through an oven, between the embossing roller and a rubber or rubber coated cylindrical roller and over two cooling rollers and wound up on a second roll. The backing may be treated with a release agent, e.g. a silicone, so that it may be separated from the plastic foil after the process and wound up on a separate roll.

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