# US 2026/0061908 A1 · Multi-layer comfortable air fiber structure, preparation method therefor, and seat cushion, backrest and seat prepared therefrom > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0061908 A1 - Document ID: US20260061908A1 - Status: Published application - Kind: A1 - Application number: 19/105,859 - Filed: 2023-12-27 - Published: 2026-03-05 - Earliest claimed: 2022-12-29 - Assignees: Yanfeng International Automotive Technology Co., Ltd. - Applicants: Yanfeng International Automotive Technology Co., Ltd. - Inventors: Minjie Jiang; Yeqian Chu; Jie Sun; Chenglong Hu; Yongtao Xiong - Web page: https://patentgrep.com/patent/US20260061908A1 ## CPC - A47C 7/02: Seat parts - B60N 2/64: Back-rests {or cushions (B60N2/2222 takes precedence)} - A47C 7/40: for the back - A47C 27/12: with fibrous inlays, e.g. made of wool, of cotton - B32B 5/022: {Non-woven fabric} - B32B 5/267: {characterised by at least one non-woven fabric layer that is a spunbonded fabric} - B32B 2250/20: All layers being fibrous or filamentary - B32B 2307/72: Density - B32B 2307/7376: Thickness - B32B 2601/00: Upholstery - B32B 2605/003: Interior finishings - A47C: CHAIRS; SOFAS; BEDS - B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract The multi-layer comfortable air fiber structure disclosed in the present invention comprises a comfortable upper layer and a supportive lower layer, wherein the comfortable upper layer and the supportive lower layer are respectively prepared by hot pressing single-layer air fiber sheets formed from air fibers with different spinning directions, and a bottom surface of the comfortable upper layer is mechanically connected with an upper surface of the supportive lower layer. The present invention also discloses a preparation method for the multi-layer comfortable air fiber structure. The backrest or the backrest disclosed in the present invention is prepared from the above-mentioned multi-layer comfortable air fiber structure. The seat disclosed in the present invention is formed by the above seat cushion and backrest. The present invention meets the demand for comfort by adjusting the density and hardness of the comfortable upper layer and the supportive lower layer, and meanwhile achieves the purpose of saving materials. ## Claims ### Claim 1 A multi-layer comfortable air fiber structure, comprising a comfortable upper layer and a supportive lower layer, wherein the comfortable upper layer and the supportive lower layer are respectively prepared by hot pressing single-layer air fiber sheets formed from air fibers with different spinning directions, and a bottom surface of the comfortable upper layer is mechanically connected with an upper surface of the supportive lower layer. ### Claim 2 (depends on 1) The multi-layer comfortable air fiber structure according to claim 1, characterized in that a spinning direction M of the air fibers for the comfortable upper layer and a spinning direction N of the air fibers for the supportive lower layer form an included angle of 55° to 90°. ### Claim 3 (depends on 2) The multi-layer comfortable air fiber structure according to claim 2, characterized in that the spinning direction M of the air fibers for the comfortable upper layer is substantially perpendicular to extension of a section with the least variation after pressing, and/or the spinning direction N of the air fibers for the supportive lower layer is substantially perpendicular to extension of a section with the least variation after pressing. ### Claim 4 (depends on 3) The multi-layer comfortable air fiber structure according to claim 3, characterized in that the spinning direction of the air fibers for the comfortable upper layer is substantially perpendicular to extension of the maximum section after pressing, and/or the spinning direction of the air fibers for the supportive lower layer is substantially perpendicular to extension of the maximum section after pressing. ### Claim 5 (depends on 1) The multi-layer comfortable air fiber structure according to claim 1, characterized in that the comfortable upper layer comprises one insert region and two bolster regions, wherein the insert region is located between the two bolster regions, wherein a density of the air fibers in the insert region is lower than that of the air fibers in the bolster regions. ### Claim 6 (depends on 5) The multi-layer comfortable air fiber structure according to claim 5, characterized in that the insert region of the comfortable upper layer has a thickness of 10-50 mm. ### Claim 7 (depends on 5) The multi-layer comfortable air fiber structure according to claim 5, characterized in that the insert region of the comfortable upper layer has a density of 30-50 kg/m3. ### Claim 8 (depends on 5) The multi-layer comfortable air fiber structure according to claim 5, characterized in that the bolster regions of the comfortable upper layer have a density of 40-70 kg/m3. ### Claim 9 (depends on 5) The multi-layer comfortable air fiber structure according to claim 5, characterized in that the supportive lower layer has a thickness of 10-50 mm. ### Claim 10 (depends on 5) The multi-layer comfortable air fiber structure according to claim 5, characterized in that the supportive lower layer has a density of 40-70 kg/m3. ### Claim 11 (depends on 1) The multi-layer comfortable air fiber structure according to claim 1, characterized in that the density and hardness of the comfortable upper layer and the supportive lower layer are adjustable. ### Claim 12 (depends on 1) The multi-layer comfortable air fiber structure according to claim 1, characterized in that the mechanical connection specifically comprises connecting the bottom surface of the comfortable upper layer with the upper surface of the supportive lower layer by one or any two of the following means: hanging steel wires and C-rings, hook-and-loop fasteners, felted cloth, magnetic powder sheets, binders, pins and insert sleeves, elastomers, direct snapping, annular hooks and surface-covering molding strips, and reinforced connection layers and heat-ironing. ### Claim 13 (depends on 12) The multi-layer comfortable air fiber structure according to claim 12, characterized in that the connection means with the felted cloth is specifically as following: the supportive lower layer are integrally formed by in-mold hot pressing with porous adhesive-backed felted cloth, and then bonded with the comfortable upper layer through a porous binder layer by means of heating and pre-pressing. ### Claim 14 (depends on 12) The multi-layer comfortable air fiber structure according to claim 12, characterized in that reinforced connection layers are provided at the connection between the comfortable upper layer and the supportive lower layer. ### Claim 15 (depends on 1) A preparation method for the multi-layer comfortable air fiber structure according to claim 1, characterized by comprising the following steps: continuously spinning air fibers in a spinning direction M to form an air fiber sheet for a comfortable upper layer, and then hot-pressing the air fiber sheet for the comfortable upper layer to form the comfortable upper layer; continuously spinning air fibers in a spinning direction N to form an air fiber sheet for a supportive lower layer, and then hot-pressing the air fiber sheet for the supportive lower layer to form the supportive lower layer; and connecting a bottom surface of the comfortable upper layer with an upper surface of the supportive lower layer by mechanical connection to form the multi-layer comfortable air fiber structure, wherein the spinning directions M and N are different. ### Claim 16 (depends on 1) A seat cushion, characterized in that it is prepared from the multi-layer comfortable air fiber structure according to claim 1. ### Claim 17 (depends on 1) A backrest, characterized in that it is prepared from the multi-layer comfortable air fiber structure according to claim 1. ### Claim 18 (depends on 1) A seat, characterized in that it is formed by a seat cushion prepared from the multi-layer comfortable air fiber structure of claim 1 and a backrest prepared from the multi-layer comfortable air fiber structure of claim 1. ### Claim 19 (depends on 18) A vehicle, comprising the seat according to claim 18, and a mounting structure configured to secure the seat within the vehicle, the vehicle being a motor vehicle, a train, an airplane or a spacecraft.