# US 6,296,733 B1 · Floor mats and method of making same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,296,733 B1 - Document ID: US6296733B1 - Status: Granted - Kind: B1 - Application number: 09/203,138 - Filed: 1998-12-01 - Granted: 2001-10-02 - Earliest claimed: 1998-12-01 - Assignees: Lear Corporation - Inventors: Patrick E. Hudkins; Mark W. Thompson; Steven P. Hammond - Web page: https://patentgrep.com/patent/US6296733B1 ## CPC - B29C 43/58: Measuring, controlling or regulating {(for bank adjustment in calendering B29C43/245)} - B29C 43/206: {by pressing the material between two preformed layers, e.g. deformable layers} - B29C 2043/5816: {temperature} - B29L 2031/3017: {Floor coverings} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A floor mat for covering a motor vehicle flooring system having a plurality of fibers is disclosed. The floor mat includes a thermoplastic layer having first and second surfaces and a plurality of projections extending from the second surface. Each of the projections includes an elongated body portion and an enlarged tip for engaging the fibers. A method of making such floor mats is also disclosed. ## Claims ### Claim 1 A method of making a floor mat, the method comprising: positioning a thermoplastic layer on a mold having a plurality of cavities for forming projections on the thermoplastic layer; positioning a cover layer over the thermoplastic layer; forcing the cover layer and the thermoplastic layer against the mold to bond the thermoplastic layer and the cover layer together and to form a plurality of projections on the thermoplastic layer, each of the projections having an elongated body portion; positioning the thermoplastic layer and the cover layer between first and second platens of a press with the projections in heat transfer relationship with a heated surface of the second platen; allowing heat from the heated surface to sufficiently soften the projections; compressing the cover layer and the thermoplastic layer between the first and second platens so as form enlarged tips on the projections; and positioning the cover layer and the thermoplastic layer adjacent a relatively cooler surface with the projections in heat transfer relationship with the relatively cooler surface to sufficiently solidify the projections. ### Claim 2 (depends on 1) The method of claim 1 wherein each body portion tapers toward a respective enlarged tip from a maximum diameter in the range of 1.2 to 2.5 millimeters to a minimum diameter in the range of 0.5 to 1.5 millimeters, and wherein each enlarged tip has a diameter in the range of 1 to 2.5 millimeters. ### Claim 3 (depends on 1) The method of claim 1 wherein the first platen has a first surface maintained at a temperature in the range of 40° F. to 120° F., and the heated surface of the second platen is maintained at a temperature in the range of 250° F. to 400° F., and wherein the step of compressing the cover layer and the thermoplastic layer between the first and second platens so as form enlarged tips on the projections comprises applying a compressive force in the range of 1 to 10 psi to the cover layer and the thermoplastic layer. ### Claim 4 (depends on 1) The method of claim 1 further comprising heating the mold and the thermoplastic layer, prior to the step of forcing the cover layer and the thermoplastic layer against the mold to form a plurality of projections, by positioning the mold between first and second platens of a first press such that the cover layer is disposed proximate the first platen, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 500° F., and applying a compressive force in the range of 10 to 50 psi to the cover layer, the thermoplastic layer and the mold by compressing the cover layer, the thermoplastic layer and the mold between the first and second platens of the first press. ### Claim 5 (depends on 4) The method of claim 4 wherein the step of heating the mold and the thermoplastic layer further comprises positioning the mold between first and second platens of a second press such that the cover layer is disposed proximate the first platen, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 500° F., and applying a compressive force in the range of 10 to 50 psi to the cover layer, the thermoplastic layer and the mold by compressing the cover layer, the thermoplastic layer and the mold between the first and second platens of second first press. ### Claim 6 (depends on 5) The method of claim 5 wherein the step of forcing the cover layer and the thermoplastic layer against the mold comprises positioning the mold between first and second platens of a third press, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 40° F. to 120° F., and applying a compressive force in the range of 50 to 180 psi to the cover layer, the thermoplastic layer and the mold by compressing the cover layer, the thermoplastic layer and the mold between the first and second platens of the third press. ### Claim 7 A method of making a floor mat, the method comprising: positioning a thermoplastic layer on a mold having a plurality of cavities for forming projections on the thermoplastic layer; positioning the mold between first and second platens of a first press, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 500° F.; applying a compressive force in the range of 10 to 50 psi to the mold and the thermoplastic layer by compressing the mold and the thermoplastic layer between the first and second platens of the first press so as to heat the thermoplastic layer to a first temperature; positioning the mold between first and second platens of a second press, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 500° F.; applying a compressive force in the range of 10 to 50 psi to the mold and the thermoplastic layer by compressing the mold and the thermoplastic layer between the first and second platens of the second press so as to heat the thermoplastic layer to a second temperature, which is at least as great as a molding temperature of the thermoplastic layer; positioning the mold between first and second platens of a third press, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 40° F. to 120° F.; applying a compressive force in the range of 50 to 180 psi to the mold and the thermoplastic layer by compressing the mold and the thermoplastic layer between the first and second platens of the third press so as to form a plurality of projections on the thermoplastic layer, each of the projections having an elongated body portion; removing the thermoplastic layer from the mold; positioning the thermoplastic layer between first and second platens of a fourth press, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 400° F.; and applying a compressive force in the range of 1 to 10 psi to the thermoplastic layer by compressing the thermoplastic layer between the first and second platens of the fourth press so as form enlarged tips on the projections. ### Claim 8 (depends on 7) The method of claim 7 wherein the step of applying a compressive force in the range of 50 to 180 psi to the mold and the thermoplastic layer by compressing the mold and the thermoplastic layer between the first and second platens of the third press includes applying the compressive force for no longer than about 30 seconds. ### Claim 9 (depends on 7) The method of claim 7 wherein each body portion tapers toward a respective enlarged tip from a maximum diameter in the range of 1.2 to 2.5 millimeters to a minimum diameter in the range of 0.5 to 1.5 millimeters, and wherein each enlarged tip has a diameter in the range of 1 to 2.5 millimeters. ### Claim 10 (depends on 7) The method of claim 7 further comprising positioning the thermoplastic layer in heat transfer relationship with a cooling platen having a surface maintained at a temperature in the range of 40° F. to 120° F., so as to sufficiently solidify the projections. ### Claim 11 (depends on 7) The method of claim 7 further comprising joining a cover layer to the thermoplastic layer. ### Claim 12 A method of making a removable floor mat for covering a flooring system, the method comprising: positioning a thermoplastic layer on a mold having a cavity for forming a projection on the thermoplastic layer, the mold further having an escape passage for allowing air to escape from the cavity; heating the mold in a first press including a platen having a surface maintained at a first predefined temperature; transferring heat to the thermoplastic layer by contact with the heated mold under conditions sufficient to soften the thermoplastic layer without causing substantial flow thereof; causing a portion of the thermoplastic layer to flow into the cavity while maintaining the temperature at about an entrance of the escape passage below the molding temperature of the thermoplastic layer, thereby minimizing flow of thermoplastic material into the escape passage, so as to form a projection on the thermoplastic layer, the projection having an elongated body portion; heating the projection to sufficiently soften the projection; and compressing the thermoplastic layer sufficiently so as to form an enlarged tip on the projection, the enlarged tip being engageable with the flooring system. ### Claim 13 (depends on 12) The method of claim 12 wherein the temperature at about the entrance of the escape passage is maintained at least 20° F. below the molding temperature of the thermoplastic layer. ### Claim 14 (depends on 12) The method of claim 12 wherein the body portion tapers toward the enlarged tip from a maximum diameter in the range of 1.2 to 2.5 millimeters to a minimum diameter in the range of 0.5 to 1.5 millimeters, and wherein the enlarged tip has a diameter in the range of 1 to 2.5 millimeters. ### Claim 15 (depends on 12) The method of claim 12 further comprising joining a cover layer to the thermoplastic layer. ### Claim 16 (depends on 12) The method of claim 12 wherein the first predefined temperature is in the range of 250° F. to 500° F. ### Claim 17 (depends on 12) The method of claim 12 further comprising heating the mold in a second press after heating the mold in the first press, the second press including a platen having a surface maintained at a second predefined temperature, and transferring heat to the thermoplastic layer by contact with the further heated mold under conditions sufficient to soften the thermoplastic layer without causing substantial flow thereof. ### Claim 18 (depends on 17) The method of claim 17 wherein the second predefined temperature is in the range of 250° F. to 500° F. ### Claim 19 (depends on 17) The method of claim 17 wherein each of the first and second presses exerts a compressive force in the range of 10 to 50 psi. ### Claim 20 (depends on 17) The method of claim 17 wherein the step of causing a portion of the thermoplastic layer to flow into the cavity comprises compressing the thermoplastic layer in a third press. ### Claim 21 (depends on 20) The method of claim 20 wherein the third press exerts a compressive force in the range of 50 to 180 psi. ### Claim 22 (depends on 20) The method of claim 20 wherein the step of heating the projection comprises heating the thermoplastic layer in a fourth press. ### Claim 23 (depends on 22) The method of claim 22 wherein the fourth press includes a platen having a surface maintained in the range of 250° F. to 400° F. ### Claim 24 (depends on 22) The method of claim 22 wherein the step of compressing the thermoplastic layer comprises compressing the thermoplastic layer in the fourth press. ### Claim 25 (depends on 24) The method of claim 24 wherein the compressive force exerted by the fourth press is in the range of 1 to 10 psi. ### Claim 26 (depends on 24) The method of claim 24 further comprising positioning the thermoplastic layer in heat transfer relationship with a cooling platen having a surface maintained at a temperature in the range of 40° F. to 120° F., so as to sufficiently solidify the projection. ### Claim 27 A method of making a removable floor mat for covering a flooring system, the method comprising: positioning a thermoplastic layer on a mold, the mold having a plurality of cavities for forming projections on the thermoplastic layer, the mold further having a plurality of escape passages extending from the cavities to an edge of the mold for allowing air to escape from the cavities; positioning a cover layer over the thermoplastic layer; positioning the mold between first and second platens of a first press such that the cover layer is disposed proximate the first platen, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 500° F.; applying a compressive force in the range of 10 to 50 psi to the mold, the thermoplastic layer and the cover layer by compressing the mold, the thermoplastic layer and the cover layer between the first and second platens of the first press so as to heat the thermoplastic layer to a first temperature without causing substantial flow of thermoplastic material into the cavities; positioning the mold between first and second platens of a second press such that the cover layer is disposed proximate the first surface, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 500° F.; applying a compressive force in the range of 10 to 50 psi to the mold, the thermoplastic layer and the cover layer by compressing the mold, the thermoplastic layer and the cover layer between the first and second platens of the second press so as to heat the thermoplastic layer to a second temperature without causing substantial flow of thermoplastic material into the cavities, wherein the second temperature is at least as great as a molding temperature of the thermoplastic layer; positioning the mold between first and second platens of a third press, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 40° F. to 120° F.; applying a compressive force in the range of 50 to 180 psi to the mold, the thermoplastic layer and the cover layer by compressing the mold, the thermoplastic layer and the cover layer between the first and second platens of the third press, while maintaining the temperature at entrances of the escape passages at least 20° F. below the molding temperature of the thermoplastic layer, thereby minimizing flow of thermoplastic material into the escape passages, so as to form a plurality of projections on the thermoplastic layer; removing the thermoplastic layer and the cover layer from the mold; positioning the thermoplastic layer between first and second platens of a fourth press such that the cover layer is disposed proximate the first platen and the thermoplastic layer is disposed proximate the second platen, the first platen having a first surface maintained at a temperature in the range of 40° F. to 120° F., the second platen having a second surface maintained at a temperature in the range of 250° F. to 400° F.; applying a compressive force in the range of 1 to 10 psi to the thermoplastic layer and the cover layer by compressing the thermoplastic layer and the cover layer between the first and second platens of the fourth press so as form enlarged tips on the projections; and positioning the thermoplastic layer in heat transfer relationship with a cooling platen having a surface maintained at a temperature in the range of 40° F. to 120° F., so as to sufficiently solidify the projections. ### Claim 28 (depends on 27) The method of claim 27 wherein each body portion tapers toward a respective enlarged tip from a maximum diameter in the range of 1.2 to 2.5 millimeters to a minimum diameter in the range of 0.5 to 1.5 millimeters, and wherein each enlarged tip has a diameter in the range of 1 to 2.5 millimeters.