Light weight board of improved surface flatness and process for production thereof

  • US 6,759,114 B2
  • Filed: 10/27/2001
  • Issued: 07/06/2004
  • Est. Priority Date: 10/27/2001
  • Status: Active Grant
First Claim
Patent Images

1. A light weight hollow thermoplastic board, which comprises:

  • a first planar sheet;

    a second planar sheet; and

    , a plurality of ribs, each of said ribs having a plurality of fixed gas pockets located therein;

    wherein said fixed gas pockets are small closed bubbles forming a foamed extension to said ribs; and

    wherein said first planar sheet and said second planar are spaced apart by and are interconnected by said ribs.

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