Nonwoven fabric

Abstract

To provide a nonwoven fabric having apertures capable of being controlled to open and close depending on a prescribed condition.SOLUTION: A nonwoven fabric according to an embodiment of the invention contains shape memory fibers and includes a nonwoven fabric body and a plurality of apertures. Each of the plurality of apertures has an aperture body opening in a thickness direction of the nonwoven fabric and a lid part constituted so as to be able to cover the aperture body. The lid part has a connection part connected to the nonwoven fabric body. Each of the plurality of apertures is constituted so as be changed from an open shape in which the aperture body is opened due to bending in a thickness direction of the connection part to a closed shape in which an aperture area in a plan view is smaller than that of the open shape when the nonwoven fabric is immersed in hot water at 40°C for 30 seconds.SELECTED DRAWING: Figure 1

Claims

[Claim 1] Nonwoven fabric containing shape memory fibers, The aforementioned nonwoven fabric is Nonwoven fabric body, The nonwoven fabric body has a plurality of openings formed therein, Each of the multiple openings is, The opening body having holes in the thickness direction of the nonwoven fabric, It has a lid portion configured to cover the opening body, The lid portion has a connecting portion connected to the nonwoven fabric body, Each of the multiple openings is, The device is configured such that when immersed in 40°C hot water for 30 seconds, the connecting portion bends in the thickness direction, opening the main body of the opening, and switching between an open shape and a closed shape in which the opening area in a plan view is smaller than that of the open shape. Nonwoven fabric. [Claim 2] The multiple openings are, It includes a first opening that switches from the open shape to the closed shape when immersed in 40°C hot water for 30 seconds. The nonwoven fabric according to claim 1. [Claim 3] The multiple openings are, It includes a second opening that switches from the closed shape to the open shape when immersed in 40°C hot water for 30 seconds. The nonwoven fabric according to claim 1. [Claim 4] The opening body of the second opening is configured in a groove shape. The nonwoven fabric according to claim 3. [Claim 5] The nonwoven fabric has a fiber orientation direction that is perpendicular to the thickness direction, and a direction that is perpendicular to the said direction. The connecting portion intersects the fiber orientation direction. The nonwoven fabric according to claim 1. [Claim 6] In the nonwoven fabric, the angle between the bent connecting portion in the open shape and the main surface extending on a plane perpendicular to the thickness direction is 30 degrees or more and 130 degrees or less. The nonwoven fabric according to claim 1. [Claim 7] The nonwoven fabric is a nonwoven fabric for absorbent articles. The nonwoven fabric according to any one of claims 1 to 6. [Claim 8] The nonwoven fabric comprises the nonwoven fabric according to any one of claims 1 to 6. Absorbent material. [Claim 9] A method for producing a nonwoven fabric containing shape memory fibers, The process includes a first cutting step in which a prototype nonwoven fabric containing shape memory fibers is pressed against a first support having a plurality of first protrusions, and the prototype nonwoven fabric is cut open by the plurality of first protrusions to form a plurality of open second openings. A method for manufacturing nonwoven fabrics. [Claim 10] In the first cutting step, the first support is heated to 80°C or higher and 200°C or lower. Furthermore, after the first cutting step, the planarization step includes flattening the multiple open-shaped second openings formed in the original nonwoven fabric at a temperature of 60°C or lower to form a plurality of closed-shaped second openings. A method for producing a nonwoven fabric according to claim 9. [Claim 11] A second cutting step is performed to further form a plurality of open first openings on an intermediate nonwoven fabric in which a plurality of closed second openings have been formed by the flattening step, The process includes a second cutting step in which the intermediate nonwoven fabric is pressed against a second support, which is maintained at 60°C or below and has multiple second protrusions arranged in a different pattern from the multiple first protrusions, and the intermediate nonwoven fabric is cut open by the multiple second protrusions to form multiple open first openings, The first opening switches from the open shape to the closed shape when immersed in 40°C hot water for 30 seconds. The second opening switches from the closed shape to the open shape when immersed in 40°C hot water for 30 seconds. A method for producing a nonwoven fabric according to claim 10.

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