METHOD OF MAKING A COMPOSITE BOARD PRODUCT FROM SCRAP MATERIALS

• US 3,671,615 A
• Filed: 11/10/1970
• Issued: 06/20/1972
• Est. Priority Date: 11/10/1970
• Status: Expired due to Term

• Current Assignee: Herbert K. Price
• Original Assignee: Herbert K. Price
• Inventors: Herbert, K. Price
• Primary Examiner(s): Robert F. Burnett
• Assistant Examiner(s): Linda Koeckert
• Application Number:
  US05/088,275
• Time in Patent Office: 588 Days
• Field of Search: 156/62.2,242,306 264/109,115,116,123,125,140,39
• US Class Current: 264/39
• CPC Class Codes: C08J 11/06 without chemical reactions
• CPC Class Codes: D21J 1/00 Fibreboard preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling

Abstract

A method of making a composite board product from scrap materials such as are customarily available from a printing plant. The scrap materials are derived from three types of materials designated herein as plastic materials, fibrous materials and filler materials. The scrap materials are shredded or pulverized into small particles after which particles of a specified size are separated, filtered or culled out for further processing. The separated particles of the required size are homogenized in a mixing step and then placed in a preheated mold. Here the particles are subjected to unusually low pressure and temperature while formed into a finished product with the aid of a platen press. Typical finished products are employed as floor tiles, counter tops, wall panels or insulation.

Claims

2. A method of making a composite board product from scrap materials as defined in claim 1 wherein said plastic materials are selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, acrylic, polyester, polyamide, polysulfide, polycarbonate, ethylene-vinyl acetate, polyether, polystyrene, and combinations thereof.

3. A method of making a composite board product from scrap materials as defined in claim 1 wherein said fibrous materials are selected from the group consisting of paper, paperboard, cloth and rags.

4. A method of making a composite board product from scrap materials as defined in claim 1 wherein said filler materials are selected from the group consisting of metallic foils, ink pigments, plasticizers, and wax.

5. A method of making a composite board product from scrap materials as defined in claim 1 wherein said separating step consists of filtering said separated particles through screens having a mesh in a range from about one-tenth inch to about one sixty-fourth inch.

6. A method of making a composite board product from scrap materials as defined in claim 5 wherein said screen has a mesh of about one thirty-second inch.

7. A method of making a composite board product from scrap materials as defined in claim 1 wherein said plastic materials are thermoplastic in nature.

8. A method of making a composite board product from scrap materials as defined in claim 7 wherein said plastic materials are selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, acrylic, polyester, polyamide, polysulfide, polycarbonate, ethylene-vinyl acetate, polyether, polystyrene and combinations thereof.

9. A method of making a composite board product from scrap materials as defined in claim 1 wherein said pressure range is limited to between about 80 psi and 100 psi.

10. A method of making a composite board product from scrap materials as defined in claim 1 wherein said homogenized particles are compressed between said platens of said forming press for a period of time from about 30 seconds to about 90 seconds.

11. A method of making a composite board product from scrap materials as defined in claim 1 including the additional step of coating said platents of said forming press with a release coating consisting of polytetrafluoroethylene.