EP0123545A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Nonwoven sheet, method for making the same, and composite sheet incorporating it
Assignee: Toray Industries Inc
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Filing: 1984-04-24
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Granted: —
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Expires: 2004-04-24
Abstract
Abstract A nonwoven sheet has fine individual fibres and yarn-like fire bundles, all oriented mainly in the lengthwise direction of the sheet, the fibre bundles outnumbering the individual fine fibres on one surface of the sheet, and the individual fine fibres outnumbering the fibre bundles on the opposite surface. Composite sheets may be made from this nonwoven sheet and another material, notably a nonwoven web of short staple fibres with a thin aluminium coating on one surface. A method of making the nonwoven sheet of the invention involves ejecting a molten thermoplastic polymer from a spinneret (8) using ejecting currents. The angle a between the line of ejecting current (9) and the surface of a collecting member (11) is preferably between 15 and 75°.
Inventors
- 👤 Ando Katsutoshi
- 👤 Nishiura Eiichi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; D; D04; D04H; D04H3/00; D04H3/005; D04H3/009; D04H3/011; B32B15/00; B32B15/14; B32B5/02; B32B5/022; D04H1/00; D04H1/70; D04H1/74; D04H3/016; D04H3/02; D04H3/03; D04H3/033; D04H3/08; D04H3/10; D04H3/11; D04H3/16; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2307/00; B32B2307/50; B32B2307/54; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/27; Y10T442/00; Y10T442/30; Y10T442/3382; Y10T442/3415; Y10T442/3431; Y10T442/3439; Y10T442/3707; Y10T442/3772; Y10T442/40; Y10T442/494; Y10T442/60; Y10T442/654; Y10T442/656; Y10T442/659; Y10T442/66; Y10T442/663
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
78 words
A nonwoven sheet composed mainly of fine fibres which are individually distributed, substantially throughout the sheet and mainly oriented in one direction ("the lengthwise direction"), said sheet also including yarn-like fibre bundles of said fine fibres.which are also oriented in the lengthwise direction of said sheet, the yarn-like fibre bundles outnumbering the fine fibres on one surface of the sheet material and the fine fibres outnumbering the yarn-like fibre bundles on the other surface of said sheet material.
Claim 2
Dependent Claim
78 words
A nonwoven sheet composed mainly of fine fibres which are individually distributed, substantially throughout the sheet and mainly oriented in one direction ("the lengthwise direction"), said sheet also including yarn-like fibre bundles of said fine fibres.which are also oriented in the lengthwise direction of said sheet, the yarn-like fibre bundles outnumbering the fine fibres on one surface of the sheet material and the fine fibres outnumbering the yarn-like fibre bundles on the other surface of said sheet material.
Claim 3
Dependent Claim
78 words
A nonwoven sheet composed mainly of the fine fibres which are individually distributed substantially throughout the sheet and mainly oriented in one direction ("the lengthwise direction"), said sheet also including yarn-like fibre bundles of said fine fibres which are also oriented in the lengthwise direction of said sheet, the ratio of fibre bundles to fibres on one surface of the sheet being greater than the ratio of fibre bundles to fibres on the other surface of the sheet.
Claim 4
Dependent Claim
78 words
A nonwoven sheet composed mainly of the fine fibres which are individually distributed substantially throughout the sheet and mainly oriented in one direction ("the lengthwise direction"), said sheet also including yarn-like fibre bundles of said fine fibres which are also oriented in the lengthwise direction of said sheet, the ratio of fibre bundles to fibres on one surface of the sheet being greater than the ratio of fibre bundles to fibres on the other surface of the sheet.
Claim 5
Dependent Claim
29 words
. A nonwoven sheet as claimed in Claim 1 or 2, wherein the fine fibre consists of a thermoplastic synthetic fibre and is produced by a melt blowing process.
Claim 6
Dependent Claim
29 words
A nonwoven sheet as claimed in any preceding claim, wherein the fine fibre is a fibre having a finite length and a denier of not more than 1 denier.
Claim 7
Dependent Claim
21 words
A nonwoven sheet as claimed in any preceding claim, wherein coefficient of variation of sheet unevenness is not more than 12%.
Claim 8
Dependent Claim
18 words
A nonwoven sheet as claimed in any preceding claim, wherein the fine fibre consists of a polybutylene terephthalate.
Claim 9
Dependent Claim
19 words
A nonwoven sheet as claimed in any preceding claim, wherein said nonwoven sheet is subjected to water punching treatment.
Claim 10
Dependent Claim
27 words
A nonwoven sheet as claimed in any preceding claim, wherein the tensile strength per unit weight of the sheet is not less than 0.01 kg/5cm/g/m 2 .
Claim 11
Dependent Claim
24 words
A composite sheet comprising a nonwoven sheet according to any preceding claim layered on at least one of its surfaces to another sheet material.
Claim 12
Dependent Claim
36 words
A composite sheet as claimed in Claim 9, wherein a sheet material to be layered on said nonwoven sheet material is a different nonwoven sheet from the nonwoven sheet of any of claims 1 to 8.
Claim 13
Dependent Claim
28 words
A composite sheet as claimed in Claim 9, wherein the said sheet material to be layered is a fabric selected from a knitting fabric and a woven fabric.
Claim 14
Dependent Claim
40 words
A composite sheet as claimed in Claim 10, wherein the said sheet material to be layered is a nonwoven fabric sheet consisting of short staple fibres having a film-like thin metal layer provided on one surface of said fabric sheet.
Claim 15
Dependent Claim
35 words
A composite sheet as claimed in Claim 12, wherein the nonwoven sheet according to any of claims 1 to 8 is layered on the surface of said nonwoven fabric sheet remote from said metal layer.
Claim 16
Dependent Claim
39 words
A composite sheet as claimed in Claim 12, wherein the nonwoven sheet material according to any of claims 1 to 8 is layered on the surface of said nonwoven fabric sheet which is provided with the metal layer thereon.
Claim 17
Dependent Claim
55 words
A composite sheet as claimed in Claim 12, wherein the said nonwoven fabric sheet having short staple fibres (but without the metal layer) is layered on the opposite surface of the nonwoven sheet material according to any of claims 1 to 8 from the surface with provided/the nonwoven fabric sheet with the metal layer thereon.
Claim 18
Dependent Claim
47 words
A composite sheet as claimed in any of Claims 12 to 15 wherein the nonwoven fabric sheet consisting of short staple fibres having the metal layer on one surface thereof possesses an average frequency of fluff within the range of 50 to 500 counts per 10 cm.
Claim 19
Independent Claim
104 words
A method of making a nonwoven sheet, in which a melted thermoplastic polymer is ejected from a spinneret with ejecting currents and is impinged towards the surface of a collecting member to form a web characterized in that the melt blowing spinneret is so arranged that the ejecting direction of the melted polymer and the currents from said spinneret are inclined at an angle with respect to the tangential line of the surface of the collecting member, thereby collecting said polymer into a web by producing an ejecting current which is forced to flow in one direction along the surface of the collecting member.
Claim 20
Independent Claim
104 words
A method of making a nonwoven sheet, in which a melted thermoplastic polymer is ejected from a spinneret with ejecting currents and is impinged towards the surface of a collecting member to form a web characterized in that the melt blowing spinneret is so arranged that the ejecting direction of the melted polymer and the currents from said spinneret are inclined at an angle with respect to the tangential line of the surface of the collecting member, thereby collecting said polymer into a web by producing an ejecting current which is forced to flow in one direction along the surface of the collecting member.
Claim 21
Dependent Claim
43 words
A method of making a nonwoven sheet as claimed in Claim 17, wherein the inclined angle between the axial direction of ejecting current of the melt blowing spinneret and the tangential line of the surface of said collecting member is 15 to 75°.
Claim 22
Dependent Claim
38 words
A method of making a nonwoven sheet as claimed in Claim 17 or Claim 18, wherein the velocity of the ejected current blowing over the surface of said collecting member is not less than 5 meters per second.
Claim 23
Independent Claim
36 words
A method of making a nonwoven sheet as claimed in any of Claims 17 to 19, wherein the ejected volume of melt blowing polymer is not less than 5 Nl/min per lg/min of unit polymer discharge.
Claim 24
Independent Claim
36 words
A method of making a nonwoven sheet as claimed in any of Claims 17 to 20, wherein the distance between the ejecting spinneret and the surface of the collecting member is from 10 to 50 cm.
References Cited (Backward Citations)
No citation records indexed.
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