# US 7,611,594 B2 · Method of making a fiber laminate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,594 B2 - Document ID: US7611594B2 - Status: Granted - Kind: B2 - Application number: 10/808,242 - Filed: 2004-03-24 - Published: 2004-10-21 - Granted: 2009-11-03 - Earliest claimed: 2003-04-02 - Assignees: Reifenhauser GmbH & Co. Maschinenfabrik - Inventors: Sebastian Sommer; Jens Güdden - Web page: https://patentgrep.com/patent/US7611594B2 ## CPC - B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)} - B32B 5/06: characterised by a fibrous {or filamentary} layer {mechanically connected, e.g. by needling} to another layer, e.g. of fibres, of paper - D04H 1/425: Cellulose series - D04H 1/4374: using different kinds of webs, e.g. by layering webs - D04H 1/492: by fluid jet (D04H1/49 takes precedence) - D04H 1/498: entanglement of layered webs - D04H 5/02: strengthened or consolidated by mechanical methods, e.g. needling (needling machines D04H18/00) - D04H 5/03: by fluid jet - D04H 13/00: Other non-woven fabrics - B32B 2262/12: Conjugate fibres, e.g. core/sheath or side-by-side - B32B 2305/20: in the form of a non-woven mat - B32B 2307/54: Yield strength; Tensile strength - B32B 2307/726: Permeability to liquids, absorption - B32B 2432/00: Cleaning articles, e.g. mops or wipes - Y10T 442/663: Hydroentangled - Y10T 442/689: Hydroentangled nonwoven fabric - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An absorbent wiping cloth can be made by hydraulic bonding of hydrophilic fibers with a prebonded spunbond filament layer. A further spunbond filament layer can be provided on the fiber side of this laminate. ## Claims ### Claim 1 A method of making a fiber laminate, the method comprising the steps of sequentially: forming a nonwoven spunbond filament layer of predetermined characteristics; initially bonding the nonwoven spunbond filament layer in a calender comprising calender rolls by varying contact pressure and/or surface temperature of the calender rolls to obtain a nonwoven spunbond filament layer having varying degrees of bonding, measuring tensile strength of the nonwoven spunbond filament layer having varying degrees of bonding to obtain varying tensile strengths, and determining highest tensile strength from the varying tensile strengths, the nonwoven spunbond filament layer having the highest tensile strength being the nonwoven spunbond filament layer at maximum bonding; thereafter prebonding the nonwoven spunbond filament layer to a tensile strength of at least 50% of the tensile strength thereof at maximum bonding under conditions that are otherwise the same as in the step of initially bonding the nonwoven spunbond filament layer by adjusting the contact pressure and/or the surface temperature of the calender rolls to form a prebonded nonwoven spunbond filament layer; treating the prebonded nonwoven spunbond filament layer with at least one wetting agent; applying at least one layer of hydrophilic fibers onto the prebonded nonwoven spunbond filament layer treated with the wetting agent; and hydrodynamically bonding the layer of hydrophilic fibers to the spunbond filament layer to create a two-layer laminate forming an absorbent cloth. ### Claim 2 (depends on 1) The method defined in claim 1 wherein the calender has at least one heated embossing drum cylinder. ### Claim 3 (depends on 2) The method defined in claim 2 wherein the prebonding is carried out such that a maximum free filament length between two bonding points of the nonwoven spunbond layer is less than 15 mm. ### Claim 4 (depends on 3) The method defined in claim 3, further comprising the step of additionally deforming the prebonded nonwoven spunbond filament layer to increase the thickness thereof. ### Claim 5 (depends on 4) The method defined in claim 4 wherein the hydrophilic fibers are applied by at least one carding machine or at least one air-layering device onto the prebonded nonwoven spunbond filament layer. ### Claim 6 (depends on 5) The method defined in claim 5, further comprising the step of applying a second spunbond nonwoven material onto the laminate formed by the layers. ### Claim 7 (depends on 6) The method defined in claim 6 wherein the hydrodynamic bonding of the layers into the laminate is effected by a water-jet treatment thereof. ### Claim 8 (depends on 1) The method defined in claim 1 wherein the prebonding is carried out such that a maximum free filament length between two bonding points of the nonwoven spunbond layer is less than 15 mm. ### Claim 9 (depends on 1) The method defined in claim 1, further comprising the step of additionally deforming the prebonded nonwoven spunbond filament layer to increase the thickness thereof. ### Claim 10 (depends on 1) The method defined in claim 1 wherein the wetting agent is at least one tenside or surface active agent. ### Claim 11 (depends on 1) The method defined in claim 1 wherein the hydrophilic fibers are applied by at least one carding machine or at least one air-layering device onto the prebonded nonwoven spunbond filament layer. ### Claim 12 (depends on 1) The method defined in claim 1, further comprising the step of applying a second spunbond nonwoven material onto the laminate formed by the layers. ### Claim 13 (depends on 1) The method defined in claim 1 wherein the hydrodynamic bonding of the layers into the laminate is effected by a water-jet treatment thereof.