Rug underlay

Claim 2

batting and said fibers consist essentially of polypropylene. 3. A rug underlay of claim 1 wherein said fiber batting and said fibers comprise a major amount of polypropylene fibers and a minor amount of a mixture of

Claim 3

nylon fibers, polyester fibers and cotton fibers. 4. A rug underlay of claim 1 wherein said lower outer layer is produced by applying a heated, corrugation-producing surface to one side of said central layer to cause

Claim 4

melting of the fibers on the heated surface of that central layer. 5. A rug underlay of claim 1 wherein said upper outer thin layer of

Claim 5

polypropylene tape is adhesively attached to said intermediate layer. 6. A rug underlay of claim 1 wherein said upper outer thin layer of polypropylene tape is attached to said central layer by being needle

Claim 6

punched onto said central layer. 7. A rug underlay of claim 1 wherein said upper outer thin layer of polypropylene tape is attached to said central layer by being thermally treated to partially melt the interfacing fibers

Claim 7

of said central layer and said upper outer layer. 8. A rug underlay comprising a compressed needle punched fibrous central layer, a lower outer layer of partially fused fibers in a corrugated pattern on one outside surface of said central layer and produced by fusing and corrugating one outside surface of said central layer, and an upper outer thin layer of a low friction, polypropylene thin strips woven into a sheet

Claim 8

of said central layer and said upper outer layer. 8. A rug underlay comprising a compressed needle punched fibrous central layer, a lower outer layer of partially fused fibers in a corrugated pattern on one outside surface of said central layer and produced by fusing and corrugating one outside surface of said central layer, and an upper outer thin layer of a low friction, polypropylene thin strips woven into a sheet

Claim 9

and attached to the other outside surface of said central layer. 9. A rug underlay of claim 8 wherein said fibrous layer comprises principally

Claim 10

polypropylene fibers. 10. A rug underlay of claim 8 wherein said fibrous layer consists essentially of a mixture of a majority of polypropylene fibers, and minor amounts of nylon fibers, polyester fibers, and cotton

Claim 11

fibers. 11. A rug underlay of claim 8 wherein said central layer is prepared by needle punching a batting of fibers into a thin compressed

Claim 12

fibrous layer. 12. A method of preparing a rug underlay which comprises subjecting a mass of fiber batting to a carding process to make the fibers in said mass generally parallel to each other and subjecting the carded mass to the action of a needle punch press until the carded fiber batting is compressed into the desired thickness of a compressed fiber structure, subjecting the lower surface of the compressed fiber structure to heat and pressure to produce a corrugated surface of solidified heat softened fibers, and attaching to the upper surface of the compressed fiber structure a thin layer of a low friction woven sheet of polypropylene

Claim 13

fibrous layer. 12. A method of preparing a rug underlay which comprises subjecting a mass of fiber batting to a carding process to make the fibers in said mass generally parallel to each other and subjecting the carded mass to the action of a needle punch press until the carded fiber batting is compressed into the desired thickness of a compressed fiber structure, subjecting the lower surface of the compressed fiber structure to heat and pressure to produce a corrugated surface of solidified heat softened fibers, and attaching to the upper surface of the compressed fiber structure a thin layer of a low friction woven sheet of polypropylene

Claim 14

strips. 13. The method of claim 12 wherein the compressed fiber structure

Claim 15

is about 1/4 to 1/2 inch thick. 14. The method of claim 12 wherein the

Claim 16

fibers of the batting comprise polypropylene fibers. 15. The method of claim 12 wherein the fibers of the batting comprise a mixture of a majority of polypropylene fibers and a minority of nylon fibers, polyester

Claim 17

fibers, and cotton fibers. 16. The method of claim 12 wherein said attaching is accomplished by an adhesive applied between said central

Claim 18

layer and said thin layer of polypropylene woven sheet. 17. The method of claim 12 wherein said attaching is accomplished by lightly needle punching

Claim 19

said polypropylene sheet onto said central layer. 18. The method of claim 12 wherein said attaching is accomplished by applying heat to said layer of polypropylene sheet and to said central layer to cause partial melting

Claim 20

of the fibers at the interface between said layers. 19. A rug underlay of claim 1 wherein said outer corrugated layer contains a generally square

Claim 21

configuration to inhibit creeping of said underlay in any direction. 20. A rug underlay of claim 8 wherein said corrugated pattern is generally square throughout said one outside surface to set the fibers thereof and provide enhanced cushioning thereof.