초록 ▼

A fibrous material and a method of producing it, the material is mainly intended to be incorporated in an absorbent article and comprises a layer of continuous fibers, so-called tow, which have been bonded together in points, lines or spots in a bonding pattern, but otherwise are substantially unbon

A fibrous material and a method of producing it, the material is mainly intended to be incorporated in an absorbent article and comprises a layer of continuous fibers, so-called tow, which have been bonded together in points, lines or spots in a bonding pattern, but otherwise are substantially unbonded to each other. The tow layer is bonded with at least two bonding patterns: a first relatively strong and diffuse bonding pattern, and a second more distinct second bonding pattern. Bonding of at least the first bonding pattern takes place by thermobonding, wherein a pattern roll is used which provide the desired bonding patterns. In the first welding step the pattern roll is driven at a higher speed than the feeding speed of the tow layer, so as to create a relatively diffuse and strong bonding pattern.

대표청구항 ▼

1. A method of producing a fibrous material layer mainly intended for being incorporated in an absorbent article, selected from the group consisting of a diaper, pant diaper, incontinence guard, sanitary napkin, and wound dressing, which comprises:opening at least one bundle of continuous fibers, so

1. A method of producing a fibrous material layer mainly intended for being incorporated in an absorbent article, selected from the group consisting of a diaper, pant diaper, incontinence guard, sanitary napkin, and wound dressing, which comprises:opening at least one bundle of continuous fibers, so called tow; separating the tow fibers and evening the tow to a layer having the desired fiber distribution; and bonding the tow layer in a bonding pattern, but where the tow fibers otherwise are substantially unbonded to each other, wherein bonding is performed in two steps: a first step wherein bonding takes place by thermobonding, at which a pattern roll is used which provides the desired bonding pattern, said pattern roll being driven at a higher speed than the feeding speed of the tow layer, so as to create a relatively diffuse and strong bonding pattern in the tow layer; and a second step in which a more distinct second bonding pattern is created. 2. A method as claimed in claim 1, wherein said first and second bonding patterns are applied so as to overlap with each other over at least a substantial part of the bonded area of said fibrous material layer.3. A method as claimed in claim 1, wherein in the second step bonding also takes place by thermobonding, at which a pattern roll is used which provides the desired bonding pattern.4. A method as claimed in claim 3, wherein in the second bonding step the pattern roll is driven at substantially the same speed as the feeding speed of the tow layer.5. A method as claimed in claim 3, wherein the speed of the pattern roll of the first bonding step is at least 8% higher than the feeding speed of the tow layer.6. A method as claimed in claim 5, wherein the speed of the pattern roll of the first bonding step is between 8 and 100% higher than the feeding speed of the tow layer.7. A method as claimed in claim 6, wherein the speed of the pattern roll of the first bonding step is between 10 and 25% higher than the feeding speed of the tow layer.8. A method as claimed in claim 1, wherein in the second step the tow layer is laminated to a web of material.9. A fibrous material layer produced by the method of claim 1.10. A fibrous material layer mainly intended for being incorporated in an absorbent article, selected from the group consisting of a diaper, pant diaper, incontinence guard, sanitary napkin, and wound dressing, said material layer comprising a layer of continuous fibres, so-called tow, which have been bonded together in points, lines or spots in a bonding pattern, but otherwise are substantially unbonded to each other, wherein the tow layer is bonded with at least two bonding patterns:a first relatively strong and diffuse bonding pattern provided by thermobonding, and a second more distinct bonding pattern; said first and second bonding patterns being arranged so as to overlap with each other over at least a substantial part of the bonded area of said fibrous layer. 11. A fibrous material layer as claimed in claim 10, wherein the second bonding pattern is also a thermobonded bonding pattern.12. A fibrous material layer as claimed in claim 10, wherein a web of material is laminated to the tow layer with said second bonding pattern.13. A fibrous layer as claimed in claim 10, wherein at least a part of the continuous fibres in said tow layer are crimped or curled.14. A fibrous layer as claimed in claim 10, wherein the first and second bonding patterns comprise dots, spots or lines which cross the longitudinal direction of the tow fibers.15. A fibrous layer as claimed in claim 14, wherein individual bonding sites of the first and second bonding patterns have a length extension in one main direction, and the bonding lines of the first bonding pattern are arranged at a different angle to the main direction of the tow fibers as compared to the bonding lines of the second bonding pattern.16. A fibrous layer as claimed in claim 14, wherein individual bonding sites of the first and second bonding patterns have a length extension in one main direction, and the bonding lines within the first and/or the second bonding pattern have different angles with respect to the main direction of the fibers.17. A fibrous layer as claimed in claim 14, wherein different bonding sites overlap each other, as seen in the transverse direction of the article, so that a main portion of the tow fibers are bonded at least at some part of their length.18. An absorbent article selected from the group consisting of a diaper, pant diaper, incontinence guard, sanitary napkin, and wound dressing, comprising a liquid permeable topsheet, a liquid impervious backsheet and an absorbent body arranged therebetween, wherein the article comprises a tow layer as claimed in claim 10.19. An absorbent article according to claim 18, wherein the tow layer is used as a liquid acquisition layer applied between the topsheet and the absorbent body.20. An absorbent article according to claim 18, wherein the tow layer is used as a liquid pervious topsheet.21. An absorbent article according to claim 18, wherein the tow layer is used as an integrated topsheet/liquid acquisition layer.