Methods of making floor tile and wall covering from extruded hot recycled vinyl thermoplastic membrane having discrete fibers randomly dispersed therein

• US 5,560,797 A
• Filed: 05/19/1995
• Issued: 10/01/1996
• Est. Priority Date: 05/09/1994
• Status: Expired due to Term

• Current Assignee: Oscoda Plastics Incorporated
• Original Assignee: Oscoda Plastics Incorporated
• Inventors: Stewart, Ronald L., Burt, John R., Szabo, Kenneth A.
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): CRISPINO, RICHARD D
• Application Number:
  US08/446,536
• Time in Patent Office: 501 Days
• Field of Search: 156/244.11, 156/244.16, 156/244.19, 156/244.23, 156/244.24, 156/244.26, 156/244.27, 156/309.9, 156/322, 156/324, 264/37, 264/75, 264/176.1, 264/177.2, 264/211.12
• US Class Current: 156/244.19
• CPC Class Codes: B29B 17/0042 for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
• CPC Class Codes: B29K 2105/26 Scrap or recycled material
• CPC Class Codes: B32B 2327/06 PVC, i.e. polyvinylchloride
• CPC Class Codes: B32B 37/153 at least one layer is extruded and immediately laminated while in semi-molten state
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling
• CPC Class Codes: Y10S 264/913 From fiber or filament, or fiber or filament containing article or product, e.g. textile, cloth fabric, carpet, fiberboard

Abstract

A method of continuously fabricating a cushiony recycled plastic floor tile or wall cover wherein a single-ply sheet, made up substantially of recycled membrane and a proportion of discrete fibers sufficient to create a cushion effect in the tile, is extruded. The fibers are reduced in length by cooling the sheet extrudate produced, chopping the sheet extrudate into particles in which the fibers are reduced in length and then passing the chopped extrudate into the extruder to reextrude it. When size reduction is achieved, the hot substrate proceeds immediately into the nip between laminating rolls and a preheated cover film selected from the group comprising transparent sheet, colored sheet, and sheet with decorative imprinting is passed on into the nip with the substrate. Compressive pressure is applied by the laminating rolls to autogeneously heat weld the substrate and cover film in surface to surface sealed contact without the imposition of air bubbles or wrinkles between them. The welded product is then cooled and cut into discrete sizes.

Claims

1. A method of continuously fabricating a cushiony tough vinyl plastic floor or cover product having a decorative top side, comprising the steps of:

(a) in an extruder, extruding a single-ply sheet, made up substantially of recycled membrane and comprising a proportion of discrete tough fibers, sufficient to create a cushion effect in the product fabricated, randomly dispersed in a vinyl substrate, at an extruding temperature in which the membrane is in a soft plasticized hot state, of a semi-solidity in which it can be drawn under tensile load without substantially reducing in thickness;

(b) reducing said fibers principally to the one-eighth to three-eights of an inch range in length by cooling the sheet extrudate, chopping the sheet extrudate into particles in which the discrete fibers are reduced in length, and then passing said chopped extrudate into said extruder to reextrude it; and

, as necessary to achieve the size reduction, repeating this step;

(c) when said reduction is achieved, immediately moving the single ply sheet while at substantially extruding temperature continuously into the nip between a pair of heat radiating laminating rolls;

(d) passing a solid state compatible polymer top side cover film product selected from the group comprising transparent sheet, colored sheet and sheet with decorative imprinting, closely alongside one of said laminating rolls to apply radiant preheat to it, and then passing it continuously into said nip with the single ply sheet;

(e) utilizing heat in said single ply sheet and the heat imparted by said one of said laminating rolls to bring said cover film product to bonding temperature while applying compressive pressure to autogeneously heat weld said single ply sheet and cover film product in surface to surface sealed contact, without the imposition of air bubbles or wrinkles between them, to form a welded product; and

(f) cooling said welded single ply sheet and cover film product.

2. The process of claim 1 wherein said single ply sheet is in the range of three-thirty seconds of an inch to one-quarter of an inch in thickness and is polyvinyl chloride material.

3. The process of claim 2 wherein said welded product is cut into distinct sizes and adhesively applied over a flooring substrate in abutting contact to form a floor.

4. The process of claim 2 wherein said sheet with decorative printing is imprinted on an inner protected surface.

5. The process of claim 1 wherein said welded product is drawn from said pair of laminating rolls around a take-off roll in juxtaposed relation with said laminating rolls;

and said cover film product, in proceeding to said laminating rolls, passes alongside and adjacent to, but out of contact with, said welded product traveling on said take-off roll to radiantly absorb heat from said welded product.

6. The process of claim 5 wherein said cover film product is preheated from ambient temperature to heat welding temperature by the time it is brought into welding contact with said substrate in said nip.

7. The process of claim 5 wherein the cover film product passes within one inch of the welded product passing around the take off roll.

8. The process of claim 1 wherein said fibers are fibers selected from the group of polyester, polycarbonate, nylon, aramid, glass and carbon fibers.

9. The process of claim 2 wherein the laminating nip is a maximum of one-quarter of an inch.

10. The product of claim 1 wherein said film comprises clear polyvinyl chloride material having a decorative imprinting on its interior surface.

11. A method of continuously fabricating a tough vinyl thermoplastic plastic floor or wall cover product comprising the steps of:

a) extruding a single ply sheet from an extruder made up substantially of recycled vinyl thermoplastic membrane incorporating a proportion of randomly dispersed discrete tough fibers at an extruding temperature in which the membrane is in a soft, plasticized hot state, of a semi solidity in which it can be drawn under tensile load without substantially reducing in thickness;

b) reducing said fibers principally to a 1/8th to 3/8th of an inch range in length by cooling the sheet extrudate produced, chopping the sheet extrudate into fine particles in which the discrete fibers are reduced in length, and then passing the chopped extrudate into said extruder to reextrude it;

c) when reduction is achieved, and, as necessary to achieve size reduction, repeating this step; and

d) moving the single ply sheet formed while at substantially extruding temperature in said hot state continuously into the nip between a pair of sheeting rolls for further processing.

12. The method of claim 11 wherein said fibers comprise in the neighborhood of 10-30 percent of said substrate by weight.

13. The method of claim 11 wherein the fibers are thermoset polyester fibers dispersed in a vinyl single ply sheet.

14. A method of continuously fabricating a cushiony tough vinyl plastic floor or cover product having a decorative top side, comprising the steps of:

(a) in an extruder, extruding a single-ply sheet, made up substantially of recycled vinyl membrane and comprising a proportion of discrete tough fibers, sufficient to create a cushion effect in the product fabricated, randomly dispersed in a vinyl substrate, at an extruding temperature in which the membrane is in a soft plasticized hot state, of a semi-solidity in which it can be drawn under tensile load without substantially reducing in thickness;

(b) moving the single ply sheet from said extruder at substantially extruding temperature continuously into the nip between a pair of heat radiating laminating rolls and from there around a take off roll;

(c) passing a preheated solid state compatible polymer top side cover film product selected from the group comprising transparent sheet, colored sheet and sheet with decorative imprinting, closely alongside one of said laminating rolls to apply radiant preheat to it, and then passing it continuously into said nip with the single ply sheet;

(d) utilizing heat in said single ply sheet and the heat imparted by said one of said laminating rolls to bring said preheated cover film product to bonding temperature while applying compressive pressure to autogeneously heat weld said single ply sheet and cover film product in surface to surface sealed contact, without the imposition of air bubbles or wrinkles between them, to form a welded product; and

(e) prior to step (c) passing said cover film product closely adjacent the welded product proceeding around said take off roll to provide radiant preheat to it; and

(f) cooling said welded single ply sheet and cover film product.

15. The process of claim 14 wherein said single ply sheet is in the range of three-thirty seconds of an inch to one-quarter of an inch in thickness and is polyvinyl chloride material.

16. The process of claim 14 wherein said welded product is cut into distinct sizes and adhesively applied over a flooring substrate to form a floor.

17. The process of claim 14 wherein said cover film product is said sheet with decorate printing which is imprinted on an inner protected surface.

18. A method of continuously fabricating a cushiony tough vinyl plastic floor or cover product comprising the steps of:

(a) in an extruder, extruding a single-ply sheet, made up substantially of recycled membrane and comprising a proportion of discrete tough fibers, sufficient to create a cushion effect in the product fabricated, randomly dispersed in a vinyl substrate, at an extruding temperature in which the membrane is in a soft plasticized hot state, of a semi-solidity in which it can be drawn under tensile load without substantially reducing in thickness;

(b) reducing said fibers principally to the one-eighth to three-eighths of an inch range in length by cooling the sheet extrudate, chopping the sheet extrudate into particles in which the discrete fibers are reduced in length, and then passing said chopped extrudate into said extruder to reextrude it; and

if necessary to achieve the size reduction, repeating this step;

(c) when said reduction is achieved, immediately moving the single ply sheet while at substantially extruding temperature continuously into the nip between a pair of heat radiating laminating rolls;

(d) passing a polymer top film selected from the group comprising transparent sheet, colored sheet, and sheet with decorative imprinting, continuously into said nip with the single ply sheet;

(e) applying compressive pressure to autogeneously heat weld said single ply sheet and top film in surface to surface sealed contact, without the imposition of air bubbles or wrinkles between them, to form a welded product; and

(f) cooling said welded single ply sheet and top film.