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Hot melt thermoplastic adhesive foam system

  • US 4,059,714 A
  • Filed: 08/02/1976
  • Issued: 11/22/1977
  • Est. Priority Date: 08/02/1976
  • Status: Expired due to Term
First Claim
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1. The method of bonding with a hot melt thermoplastic adhesive foam which comprises,heating solid thermoplastic adhesive to convert it to a liquid state,mechanically agitating the liquid adhesive in the presence of a gas so as to obtain a mixture of said gas in the liquid adhesive,pressurizing the mixture of liquid and gas so as to force the gas into solution with the liquid adhesive,dispensing the liquid and gas solution at atmospheric pressure whereby said gas is released from solution and forms a hot adhesive foam, andcompressing said hot adhesive foam between two substrates to force gas from the foam and to form a bond between said substrates.

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