Method for producing molded articles

• US 4,112,038 A
• Filed: 09/02/1976
• Issued: 09/05/1978
• Est. Priority Date: 09/02/1976
• Status: Expired due to Term

• Current Assignee: Bolivia Lumber Company, LOWE Paper Company
• Original Assignee: Bolivia Lumber Company, LOWE Paper Company
• Inventors: Garner, Lynn Thomas
• Primary Examiner(s): White, Robert F.
• Assistant Examiner(s): Hall, James R.
• Application Number:
  US05/719,756
• Time in Patent Office: 733 Days
• Field of Search: 264/115, 264/37, 264/109, 264/DIG. 69, 264/138, 264/325
• US Class Current: 264/138
• CPC Class Codes: B29B 17/0042 for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
• CPC Class Codes: B29B 17/02 Separating plastics from other materials
• CPC Class Codes: B29B 2017/0258 using heated surfaces for selective softening or melting of at least one plastic ingredient
• CPC Class Codes: B29K 2711/12 Paper, e.g. cardboard
• CPC Class Codes: B29L 2009/003 comprising a metal layer
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling
• CPC Class Codes: Y10S 264/914 From cellulose containing articles, e.g. paper
• CPC Class Codes: Y10S 264/918 From hollow- or container-type articles, e.g. tubes, bottles, cups

Abstract

A method of producing molded articles comprising taking a by-product from a main process, that by-product comprising a contaminated thermoplastic material impregnated with a fibrous material, usually paper and in some instances additionally a metallic foil, removing a portion of the fibrous material for re-use in the main process and thereafter heating and molding the remaining material to form an article. In instances where the thermoplastic material is not contaminated with a fibrous material, it may be considered desirable to introduce such material.

Claims

1. Method of producing a molded article of desired shape from a by-product of a process producing a paper product having a thermoplastic material coating said by-product comprising a thermoplastic material impregnated with a fibrous material, comprising:

a. separating a portion of the fibrous material from said by-product;

b. returning said portion of separated fibrous material to said paper product process;

c. delivering the remaining portion of said thermoplastic material and fibrous material to the exit side of a nip defined between a pair of contra-rotating heated drums to heat and render said remaining materials plastic, and to cause said remaining materials to adhere to the surfaces of said drums, and to be carried thereon from said exit side of said nip towards the entrance side of said nip;

d. removing said adhered plastic remaining materials from the surfaces of said rotating drums at a location adjacent the entrance side of said nip;

e. delivering said plastic remaining materials to a molding means; and

f. molding said plastic materials to a desired article shape.