EP0248598A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyolefin-type nonwoven fabric and method of producing the same
Assignee: Unitika Ltd
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Filing: 1987-05-28
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Granted: —
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Expires: 2007-05-28
Abstract
Abstract A nonwoven fabric formed of highly spinnable heat bonded continuous filaments which is strong and soft and is superior in hand. The nonwoven fabric is formed by heat-bonding filaments of linear low density polyethylene so that the number of defects is not more than 0.01/kg, the weight is 10-100 g/m 2 , the percentage bond area is 7-20% and the total hand value is 4-300 g. The nonwoven fabric is produced by melt-extruding the above-mentioned linear low density poly-, ethylene to form filaments which are drawn by air guns at a high speed so that they are deposited on a moving collection belt to form a web which is then heat treated at a temperature 16-30°C lower than the melting point of the filaments. The nonwoven fabric an be formed of filaments of hollow or flat cross section. It is also possible to utilize bicomponent filaments having a sheath component made of linear low density , polyethylene and a core component made of polyethylene terephthalate.
Inventors
- 👤 Eiichi Kubo
- 👤 Yoshihiro Kammuri
- 👤 Koichi Nagaoka
- 👤 Takeshi Kitahara
- 👤 Yoshiki Miyahara
- 👤 Syunichi Kiriyama
- 👤 Yasunobu Mishima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:21
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; D01; D01D; D01D5/00; D01D5/08; D01D5/098; D01D5/0985; D01F; D01F6/00; D01F6/28; D01F6/30; D01F8/00; D01F8/04; D01F8/06; F; F02; F02B; F02B1/00; F02B1/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T442/00; Y10T442/60; Y10T442/637; Y10T442/641; Y10T442/681
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
A nonwoven fabric comprising filaments formed . of linear low density copolymer of ethylene and octene-1, which is linear low density polyethylene, containing substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm 3 , a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g as measured by DSC, said filaments being heat bonded together so that the number of defects is not more than 0.01/kg of the fabric, the weight is 10-100 g/m 2 the percentage bond area is 7-20% and the total hand value is 4-300 g.
Claim 2
Dependent Claim
107 words
A nonwoven fabric comprising filaments formed . of linear low density copolymer of ethylene and octene-1, which is linear low density polyethylene, containing substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm 3 , a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g as measured by DSC, said filaments being heat bonded together so that the number of defects is not more than 0.01/kg of the fabric, the weight is 10-100 g/m 2 the percentage bond area is 7-20% and the total hand value is 4-300 g.
Claim 3
Dependent Claim
27 words
A nonwoven fabric as set forth in Claim 1, wherein the single filament fineness of the filaments forming the nonwoven fabric is not more than 5 deniers.
Claim 4
Dependent Claim
42 words
A nonwoven fabric as set forth in Claim 1, wherein the single filament fieness- of the filaments forming the nonwoven fabric is not more than 5 deniers and the cross section of said filaments is hollow, the percentage hollowness being 3-50 %.
Claim 5
Dependent Claim
42 words
A nonwoven fabric as set forth in Claim 1, wherein the single filament fineness of the filaments forming the nonwoven fabric is not more than 5 deniers and the cross section of said filaments is flat, the degree of flatness being 1.5-4.0.
Claim 6
Independent Claim
130 words
A method of producing a nonwoven fabric, comprising the steps of melt-extruding, at a spinning temperature of 220-280°C, linear low density copolymer of ethylene and octene-1, which is linear low density polyethylene, containing substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm3, a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g as measured by DSC, drawing the resulting filaments at a high speed by air guns to form filaments having a single filament fineness of not more than 5 deniers, depositing said filaments on a moving collection belt to form a web, and heat-treating said web at a temperature which is 15-30°C lower than the melting point of said filaments.
Claim 7
Independent Claim
130 words
A method of producing a nonwoven fabric, comprising the steps of melt-extruding, at a spinning temperature of 220-280°C, linear low density copolymer of ethylene and octene-1, which is linear low density polyethylene, containing substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm3, a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g as measured by DSC, drawing the resulting filaments at a high speed by air guns to form filaments having a single filament fineness of not more than 5 deniers, depositing said filaments on a moving collection belt to form a web, and heat-treating said web at a temperature which is 15-30°C lower than the melting point of said filaments.
Claim 8
Dependent Claim
109 words
A nonwoven fabric comprising bicomponent filaments having a sheath component made of linear low density copolymer of ethylene and octene-1, which is linear low density polyethylene, containing substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm3, a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g, and a core component made of polyethylene terephthalate, said bicomponent filaments being heat bonded together so that the number of defects is not more that 0.01/k g of the nonwoven fabric, the weight is 10-200 g/m 2 and the percentage bond area is 7-40%.
Claim 9
Dependent Claim
109 words
A nonwoven fabric comprising bicomponent filaments having a sheath component made of linear low density copolymer of ethylene and octene-1, which is linear low density polyethylene, containing substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm3, a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g, and a core component made of polyethylene terephthalate, said bicomponent filaments being heat bonded together so that the number of defects is not more that 0.01/k g of the nonwoven fabric, the weight is 10-200 g/m 2 and the percentage bond area is 7-40%.
Claim 10
Dependent Claim
27 words
A nonwoven fabric as set forth in Claim 6, wherein the single filament fineness of the bicomponents forming the nonwoven fabric is not more than 5 deniers.
Claim 11
Dependent Claim
42 words
A nonwoven fabric as set forth in Claim 6, wherein the structural ratio of the linear low density polyethylene which is the sheath component of the bicomponent filaments forming the nonwoven fabric to the polyethylene terephthalate is 20-80 : 80-20 by weight.
Claim 12
Independent Claim
157 words
A method of producing a nonwoven fabric, comprising the steps of using, as a sheath component, linear low density copolymer of ethylene and octene-1, which is linear low density. polyethylene, containging substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm 3 , a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g as measured by DSC, and polyethylene terphthalate as a core component, melt-extruding said sheath and core components at melting temperatures of 22θ-28θ°C and 275-295°C, respectively, spinning the resulting bicomponent filaments at a high speed by air guns to form bicomponent filaments having a single filament fineness of not more than 5 deniers, depositing said filaments on a moving collection belt to form a web, and heat-treating said web at a temperature which is 15-30°C lower than the melting point of a sheath component of said filaments.
Claim 13
Independent Claim
157 words
A method of producing a nonwoven fabric, comprising the steps of using, as a sheath component, linear low density copolymer of ethylene and octene-1, which is linear low density. polyethylene, containging substantially 1-10 weight percent octene-1 and having a density of 0.900-0.940 g/cm 3 , a melt index value of 5-45 g/10 minutes as measured by the D-1238(E) of ASTM, and a heat of fusion of not less than 25 cal/g as measured by DSC, and polyethylene terphthalate as a core component, melt-extruding said sheath and core components at melting temperatures of 22θ-28θ°C and 275-295°C, respectively, spinning the resulting bicomponent filaments at a high speed by air guns to form bicomponent filaments having a single filament fineness of not more than 5 deniers, depositing said filaments on a moving collection belt to form a web, and heat-treating said web at a temperature which is 15-30°C lower than the melting point of a sheath component of said filaments.
References Cited (Backward Citations)
No citation records indexed.
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