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WO1998045519A1 - Fibres se liant a la cellulose - Google Patents

Fibres se liant a la cellulose Download PDF

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Publication number
WO1998045519A1
WO1998045519A1 PCT/DK1998/000131 DK9800131W WO9845519A1 WO 1998045519 A1 WO1998045519 A1 WO 1998045519A1 DK 9800131 W DK9800131 W DK 9800131W WO 9845519 A1 WO9845519 A1 WO 9845519A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibres
polyolefin component
grafted
bicomponent
acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DK1998/000131
Other languages
English (en)
Inventor
Pia Holm Hansen
Anne Monrad Larsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FiberVisions AS
Original Assignee
FiberVisions AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FiberVisions AS filed Critical FiberVisions AS
Priority to DK98914837T priority Critical patent/DK0973966T3/da
Priority to KR10-1999-7008843A priority patent/KR100403057B1/ko
Priority to CA002281802A priority patent/CA2281802C/fr
Priority to AU69182/98A priority patent/AU6918298A/en
Priority to JP54226698A priority patent/JP3672324B2/ja
Priority to EP98914837A priority patent/EP0973966B1/fr
Priority to IL13158698A priority patent/IL131586A/xx
Priority to BR9809749-0A priority patent/BR9809749A/pt
Priority to DE69808061T priority patent/DE69808061T2/de
Publication of WO1998045519A1 publication Critical patent/WO1998045519A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • D04H1/544—Olefin series
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43825—Composite fibres
    • D04H1/43828—Composite fibres sheath-core
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5412—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sheath-core
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5414—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres side-by-side
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay

Definitions

  • the present invention relates to drylaid nonwoven materials comprising polyolefin bicomponent fibres having excellent bonding affinity for natural fibres such as cellulose fibres
  • Hygienic absorbent products such as disposable diapers contain, in addition to a water-permeable coverstock, a water- impermeable backsheet and one or more layers for distribution of liquid, an absorbent core typically comprising natural fi- bres such as cellulose fluff pulp fibres, synthetic fibres based on e.g. polyolefin and/or polyester and a superabsorb- ent polymer (SAP) material.
  • an absorbent core typically comprising natural fi- bres such as cellulose fluff pulp fibres, synthetic fibres based on e.g. polyolefin and/or polyester and a superabsorb- ent polymer (SAP) material.
  • the synthetic fibres which often are bicomponent fibres of e.g. polypropylene/polyethylene or polyester/polyethylene, are thermobonded to each other to form a supporting network for the core.
  • the synthetic fibres should be able to not only bond to each other, but also to the natural fibres and the SAP, so as to result in a core structure which is as strong and coherent as possible, and in which the natural fi- bres and the SAP are locked into place within the structure.
  • the existing synthetic fibres that are used for the production of drylaid, e.g. airlaid, nonwovens suffer from the disadvantage of suboptimal bonding to e.g. cellulose fi- bres.
  • the problem is made worse by the fact that the natural fibres are typically relatively short, e.g. fluff pulp fibres with a length of not more than about 3 mm, as compared to the synthetic fibres, which are normally (although not necessarily) considerably longer.
  • EP 0465203-B1 discloses thermally bonded fibrous wet laid webs containing bicomponent fibres comprising a first component of polyester, polyamide or polypropylene and a second component of linear low density polyethylene (LLDPE) with a density of 0.88-0.945 g/cc and a grafted high density polyethylene (HDPE) with a density of 0.94-0.965 g/cc which has been grafted with maleic acid or maleic anhydride to provide succinic acid or succinic anhydride groups along the HDPE polymer.
  • LLDPE linear low density polyethylene
  • HDPE grafted high density polyethylene
  • EP 0421734-B1 discloses thermobondable bicomponent fibres composed of two different polyolefins having melting points which differ by at least 20°C, the lower melting polyolefin containing 3-10% by weight of a monoglyceride of a fatty acid of 12 or more carbon atoms incorporated therein.
  • the fibres are reported to be easily processable without the need for an oiling agent to be applied during spinning or drawing.
  • US 4,950,541 discloses succinic acid and succinic anhydride grafts of linear ethylene polymers obtained by grafting maleic acid or maleic anhydride onto a LDPE (low density polyethylene), LLDPE or HDPE polymer.
  • the grafted polymers are dyeable and can be used e.g. as the sheath component of a bicomponent fibre.
  • US 4,684,576 discloses the production of blends of grafted HDPE with ungrafted LLDPE or LDPE, the HDPE having been grafted with maleic acid or maleic anhydride to provide succinic acid or succinic anhydride groups along the HDPE poly- mer.
  • the blends are disclosed for use in producing laminate structures .
  • polyolefin bicomponent fibres whose low melting component comprises a non- grafted polyolefin component and a grafted polyolefin component which has been grafted with an unsaturated dicarboxylic acid or an anhydride thereof have advantageous properties when used in the production of drylaid nonwoven materials, including improved bonding to cellulose pulp fibres and im- proved strength properties in the resulting nonwovens.
  • the present invention relates to a drylaid nonwoven material comprising bicomponent fibres comprising a low melting polyolefin component and a high melting polyolefin component, wherein the low melting polyolefin component has a melting point at least 4°C lower than the melting point of the high melting polyolefin component, the low melting polyolefin component constituting at least a part of the surface of the fibre and comprising a non-grafted polyolefin component and a grafted polyolefin component, wherein the grafted polyolefin component has been grafted with an unsaturated dicarboxylic acid or an anhydride thereof.
  • Another aspect of the invention relates to a method for producing a drylaid nonwoven material, comprising forming a fibrous web using dry lay nonwoven equipment, the web comprising bicomponent fibres comprising a low melting polyolefin component and a high melting polyolefin component, wherein the low melting polyolefin component has a melting point at least 4°C lower than the melting point of the high melting polyolefin component, the low melting polyolefin component constituting at least a part of the surface of the fibre and comprising a non-grafted polyolefin component and a grafted polyolefin component, wherein the grafted polyolefin component has been grafted with an unsaturated dicarboxylic acid or an anhydride thereof, and bonding the fibrous web to result in the drylaid nonwoven material.
  • a further aspect of the invention relates to a bicomponent fibre as described above for the production of drylaid nonwoven materials.
  • polyolefin component for the purpose of this invention means a polyolefin-containing polymeric material of which the largest part (by weight) consists of homo- or co- polymers of monoolefins such as ethylene, propylene, 1-bu- tene, 4-methyl-l-pentene, etc.
  • monoolefins such as ethylene, propylene, 1-bu- tene, 4-methyl-l-pentene, etc.
  • examples of such polymers are isotactic or syndiotactic polypropylene, polyethylenes of different densities, such as high density polyethylene, low density polyethylene and linear low density polyethylene and blends of the same.
  • the polymeric material may be mixed with other non-polyolefin polymers such as polyamide or polyester, provided that polyolefins still constitute the largest part of the composition.
  • the melts used to produce the polyolefin- containing fibres may also contain various conventional fibre additives, such as calcium stearate, antioxidants, process stabilizers, compatibilizers and pigments, including whiten- ers and colourants such as Ti0 2 , etc.
  • various conventional fibre additives such as calcium stearate, antioxidants, process stabilizers, compatibilizers and pigments, including whiten- ers and colourants such as Ti0 2 , etc.
  • dirylaid nonwoven refers to a nonwoven material produced by a dry process, including airlaid nonwovens, carded nonwovens*, etc.
  • the bicomponent fibres may be of the sheath-core type with the core being located either eccentrically (off-center) or concentrically (substantially in the center), or of the side- by-side type, in which each of the two components typically has a semi-circle cross section.
  • Bicomponent fibres having irregular fibre profiles are also contemplated, e.g. an oval, ellipse, delta, star, multilobal, or other irregular cross section, as well as splittable fibres.
  • the bicomponent fibres will typically have a high melting and low melting polyolefin component which comprise, respectively, polypropylene/polyethylene (the polyethylene comprising HDPE, LDPE and/or LLDPE) , high density polyethylene/linear low density polyethylene, polypropylene random copolymer/polyethylene, or polypropylene/polypropylene random copolymer.
  • a high melting and low melting polyolefin component which comprise, respectively, polypropylene/polyethylene (the polyethylene comprising HDPE, LDPE and/or LLDPE) , high density polyethylene/linear low density polyethylene, polypropylene random copolymer/polyethylene, or polypropylene/polypropylene random copolymer.
  • the difference in melting points the difference in melting points between the two polyolefin components may be quite small, e.g. about 7-8°C and in some cases even as low as about 4-
  • the two components have melting points which differ by at least about 20°C, preferably at least about 25°C, more preferably at least about 28°C, e.g. at least about 30°C.
  • a presently preferred aspect of the in- vention relates to a drylaid nonwoven material containing polyolefin bicomponent fibres in which the low melting polyolefin component comprises a non-grafted component and a grafted component, the grafted component having been grafted with an unsaturated dicarboxylic acid or an anhydride thereof.
  • acids and anhydrides are maleic acid, maleic anhydride and derivatives thereof such as citra- conic acid, citraconic anhydride and pyrocinchonic anhydride; fumaric acid and derivatives thereof; unsaturated derivatives of malonic acid such as 3-butene-l, 1-dicarboxylic acid, benzylidene malonic acid and isopropylidene malonic acid; and unsaturated derivatives of succinic acid such as itaconic acid and itaconic anhydride.
  • maleic acid, maleic anhydride and derivatives thereof such as citra- conic acid, citraconic anhydride and pyrocinchonic anhydride
  • fumaric acid and derivatives thereof unsaturated derivatives of malonic acid such as 3-butene-l, 1-dicarboxylic acid, benzylidene malonic acid and isopropylidene malonic acid
  • unsaturated derivatives of succinic acid such as itaconic acid and itaconic anhydride.
  • Maleic acid and maleic anhydride are particularly preferred as the dicarboxylic acid or anhydride thereof.
  • the resulting chain is provided with succinic acid or succinic anhydride groups, respectively, grafted onto it.
  • the grafting of the dicarboxylic acid or anhydride thereof onto the polyolefin may be performed in a manner that is known per se, see e.g. the above-mentioned EP 0465203, US 4,950,541 and US 4, 684,576.
  • the weight ratio of grafted polyolefin to non-grafted poly- olefin in the low melting polyolefin component of the bicomponent fibres will be within the range of about 1:99 to 50:50, typically about 1.5:98.5 to 30:70, more typically about 2:98 to 20:80, e.g. about 3:97 to 15:85, such as about 5:95 to 10:90.
  • the content of carboxylic acid or anhydride thereof is typically in the range of about 1-30% (by weight) , typically about 2-20%, more typically about 3-15%, such as about 5-10%.
  • the weight ratio between the high melting and low melting polyolefin components will be in the range of from 10:90 to 90:10, typically about 20:80 to 80:20, more typically about 30:70 to 70:30, e.g. 35:65 to 65:35.
  • drylaid nonwovens according to the invention comprising polyolefin bicomponent fibres and natural fibres may be characterised by an improved bonding of the bicomponent fibres to the natural fibres as determined by a standardised dust test whose result reflects the quality of the bonding between the two types of fibres.
  • drylaid nonwoven samples having a base weight of about 85 g/m 2 and a thickness of about 1.1 mm are prepared using a line speed of 20 or 40 m/min from a mixture of 25% by weight of the synthetic fibres being tested and 75% by weight of a cellulose pulp fibre (e.g. NB 416 from Weyerhauser) .
  • Nonwovens to be tested are generally prepared using a series of different bonding temperatures (e.g. using hot air or calender bonding, typically a hot air oven) in order to optimise the properties of a given nonwoven.
  • the determination of the dust value of a nonwoven is performed as follows. Before the measurement is carried out, the nonwoven samples to be tested are conditioned for at least 12 hours to ensure that all of the samples have been subjected to the same temperature and humidity conditions. Since, as described below, the results are often expressed as a relative value compared to a control, the exact temperature and relative humidity for the conditioning of the samples is not critical, as long as all samples to be compared have been subjected to the same conditions. Ambient temperature and humidity conditions may therefore be used. Prior to conditioning, the nonwovens are cut into individual samples with a size of 12 x 30 cm.
  • a cardboard strip with a width of 5 mm is attached to the short sides of the sample, after which the sample with the attached cardboard strips is weighed on a laboratory scale with an accuracy of ⁇ 0.1 mg.
  • the nonwoven sample to be tested is then fixed with two clamps having a length of 12 cm, each of which is mounted on an arm.
  • the exposed area of the fixed nonwoven is about 310 cm 2 , which is about the size of a piece of A4 paper.
  • One of the arms is stationary, while the other arm is rotatable and is attached to a spring.
  • the test is performed by rotating the rotatable arm 45°, so that the nonwoven sample goes from a "stretched out” condition to a "relaxed” condition, after which the rotatable arm is released, whereby the action of the spring returns the rotatable arm to its original position.
  • the movement of the arm is stopped by the nonwoven sample, which thus is subjected to a small vibration and stretching effect designed to be similar to the conditions a nonwoven roll is subjected to when it is unrolled at the converter, the vibration and stretching resulting in a loss of loose fibres at the fibre surface. This action is repeated 50 times.
  • the stretching force the sample is subjected to must of course lie within the non- woven' s elasticity limit, so that the nonwoven is not substantially deformed or damaged during the test.
  • the force provided by the spring must obviously be compatible with the nonwoven to be tested, so that the nonwoven is on the one hand returned to its original stretched out position and subjected to a slight vibration and stretching, but is on the other hand not excessively stretched so as to become de- formed or damaged.
  • the sample After having been subjected to the vibration/stretching action 50 times, the sample is again weighed, and the difference between the two values is calculated and expressed as mg of dust.
  • the result m mg will often be no more than about 15 mg, typically no more than about 10 mg, preferably no more than about 5 mg, more preferably no more than about 4 mg, still more preferably no more than about 3 mg, most preferably no more than about 2 mg.
  • the result can be as low as about 1 mg of dust.
  • the standardised dust test is m terms of reduction of the amount of dust (m mg) m a standard nonwoven prepared from fibres of the invention compared to a similar nonwoven prepared from similar fibres without the grafted polyolefin component.
  • the nonwoven prepared from the fibres of the invention should show a dust reduction of at least about 40% by weight compared to the control nonwoven prepared with the control fibres, typically at least about 50% by weight.
  • the dust reduction is at least about 60%, more preferably at least about 70%, and still more preferably at least about 80%.
  • the dust reduction can be as much as about 90 0 or more. Since the dust properties of a given nonwoven can vary greatly depending on factors such as the nature of the bicomponent fibres and the nature of the cellulose or other fibres as well as e.g. the particular webforming and bonding process, it will often be preferred to compare the performance of a given fibre m terms of its dust reduction percentage com- pared to a similar control fibre rather than m terms of an absolute value m mg.
  • the fibres of the invention will also show an improved bonding and fixation of not only cellulosic fibres but also different superabsorbent polymers (SAP) that are commonly used m hygiene absorbent products in the form of particles or fibres.
  • SAPs e.g. a crosslinked polyacrylic acid salt
  • SAPs are typically used in the form of superabsorbent particles in the absorbent core of e.g. disposable diapers, since they are able to absorb many times their weight in liquid and form a gel that holds onto the liquid upon wetting.
  • the improved bonding of the fibres of the invention to the cellulosic fibres will result in an improved structure that in itself serves to ensure that the SAP particles are maintained in the desired location in the absorbent product, whereby the function of the SAP will be improved.
  • the spinning of the fibres is preferably accomplished using conventional melt spinning (also known as “long spinning"), with spinning and stretching being performed in two separate steps.
  • melt spinning also known as “long spinning”
  • other means of manufacturing staple fibres in particular "compact spinning", which is a one step operation, may be used to carry out the invention.
  • Methods for the spinning of bicomponent fibres and filaments are well-known in the art. Such methods generally involve extrusion of the melts to produce filaments, cooling and drawing of the filaments, treatment of the filaments with an appropriate spin finish to result in desired surface properties, e.g.
  • a spin finish to provide hydrophilic properties when the fibres are to be used in an absorbent core and/or to provide antistatic properties, stretching the filaments, typically, treating with a second spin finish, texturizing the filaments, drying the filaments and cutting the filaments to result in staple fibres.
  • the drylaid nonwovens of the present invention typically comprise, in addition to the polyolefin bicomponent fibres, at least one additional fibrous material, in particular natural fibres or regenerated fibres, e.g. selected from cellulose fibres, viscose rayon fibres and Lyocell fibres.
  • the cellulose fibres may e.g. be pulp fibres or cotton fibres and are in particular pulp fibres such as CTMP (chemi-thermo-mechanical pulp) , sulfite pulp or kraft pulp .
  • the fibrous web comprising the bicomponent fibres and the additional fibrous material will typically comprise 5-50% by weight of the bicomponent fibres and 50-95% by weight of the additional fibrous material, more typically 10-40% by weight of the bicomponent fibres and 60-90% by weight of the additional fibrous material, e.g. 15-25% by weight of the bicomponent fibres and 75-85% by weight of the additional fibrous material .
  • the cellulose fibres were NB 416 from Weyerhauser.
  • the weight ratio of between the bicomponent fibres and the cellulose fibres was 25:75.
  • the tested bicomponent fibres had the following composition, fibre No. 1 being according to the present invention:
  • Core polypropylene; sheath: 10% grafted LLDPE (5% maleic acid grafted onto 95% LLDPE), 90% LLDPE.
  • Control fibre core: polypropylene; sheath: 100% LLDPE.
  • Hercules 449 from Hercules Inc. length 5 mm, fineness 1.5 dtex; polypropylene core/polyethylene sheath.
  • Bicomponent fibres 1, 2 and 3 all had a fineness of 1.7 dtex, a length of 6 mm and a weight ratio between core and sheath of 35:65.
  • the fibres were run at a very low speed of 8.33 m/mm on an airlaid apparatus (Dan-Web, Denmark) , since the primary purpose of these trials was to determine the fibres' ability to bond to cellulose.
  • an airlaid nonwoven product having a basis weight of 80 g/m 2 was aimed at, and the trials were started at the lowest possible bonding temperature, after which the temperature m the oven was increased m increments of 5 or 10°C.
  • the cross direction (CD) dry strength, machine direction (MD) dry strength and MD wet strength were determined on samples produced at different temperatures as indicated below (EDANA test method No. 20.2-89, tested at a speed of 100 mm/mm) . Furthermore, the thickness and the basis weight (g/m') of each sample was determined, and this information (not listed below) was used to adjust the strength values to result m normalised values that are comparable m spite of minor differences m thickness and base weight of the individual samples tested. The results are shown below.
  • fibre 1 according to the invention gave a significantly improved result in the dust test, the greatly reduced dust generation reflecting a significantly improved bonding of the bicomponent fibres of the invention to the cellulose fluff pulp fibres. Observation of the samples by microscope also revealed bonding of the bicomponent fibres of the invention to the cellu- lose fibres. It was also found that fibre 1 gave a bulkier nonwoven compared to fibres 2 and 3 (fibre 4 was not compared in this regard) . Furthermore, as shown by the strength values given in the table above, the fibres of the invention re- suited in nonwovens with improved strength and elongation characteristics .
  • a test of the ability of two different fibres to bind cellulose was performed in a test on a commercial airlaid line. Airlaid nonwovens with a basis weight of about 80 g/m 2 and a thickness of about 1 mm were produced. The nonwovens contained 25% by weight of bicomponent fibres and 75% by weight of cellulose pulp fibres. The bicomponent fibres tested had a fineness of 1.7 dtex and a length of 6 mm. In addition to (control) fibre No. 3 described above, a bicomponent fibre (referred to as No. 5) with the same cellulose-binding additive as in fibre No. 1 but a higher melting polyethylene sheath component (HDPE) was tested. This fibre thus had the following composition:
  • Core polypropylene; sheath: 10% grafted LLDPE (5% maleic acid grafted onto 95% LLDPE), 90% HDPE.
  • the individual nonwoven samples were bonded at different temperatures with intervals of 3°C in order to ascertain the optimum bonding temperature for the individual fibres.
  • nonwovens containing bicomponent fibres of the invention resulted in an improved binding of the cellulose fibres as evidenced by a reduced generation of dust during processing compared to the control fibre (quantitative measurements were not performed in this case) . Furthermore, the fibres of the invention resulted in nonwovens with improved strength characteristics as evidenced by the following test results:
  • Tests were performed to illustrate the influence of varying the amount of additive (maleic acid grafted LLDPE with an ac- tive content of 5%) in the sheath component.
  • the bicomponent fibres tested all had a fineness of 1.7 dtex and a length of 6 mm.
  • the core/sheath weight ratio for fibres 6-9 was 35:65, and 50:50 for fibre No. 10.
  • the core was m all cases of polypropylene.
  • Nonwovens were produced on a commercial airlaid line using technology from Dan-Web, Denmark, the nonwovens having a basis weight of about 80 g/m 2 , a thickness of about 1 mm, and weight ratio of bicomponent fibres to cellulose fibres of 25:75. Samples with each of the bicomponent fibres were tested at 3 different bonding temperatures, 137, 140 and 143°C.
  • the sheath composition of the individual fibres was as follows :
  • the nonwovens containing the fibres of the invention showed a substantially improved dry and wet tensile strength compared to the control nonwovens.
  • some of the fibres of the invention notably Nos . 6, 7 and 8, showed elongation values above those of the control fibres, while fibre 10 and to a certain extent fibre 9 showed elongation values lower than for the control fibres.
  • the suboptimal results for fibres 9 and 10 in terms of elongation are believed to be related to the fact that some difficulties were experienced in spinning these fibres with a relatively large amount of the grafted component in the sheath. It is believed that with further tests and optimisation of the spinning process and other process parameters, it will be possible to obtain improved results for these and other fibres with a relatively large content of the grafted polyolefin component as well.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)
  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Artificial Filaments (AREA)

Abstract

La présente invention concerne des matériaux non tissés obtenus à sec, comprenant des fibres à deux composants constituées d'un composant polyoléfine à point de fusion bas et d'un composant polyoléfine à point de fusion élevé. Le composant polyoléfine à point de fusion bas constitue au moins une partie de la surface de la fibre et comprend un composant polyoléfine non greffé et un composant polyoléfine greffé, lequel a été greffé avec un acide dicarboxylique insaturé ou un anhydride de celui-ci, par exemple, un acide maléique ou un anhydride maléique. Les fibres à deux composants présentent une excellente affinité de liaison pour des fibres naturelles telles que des fibres de pulpe de cellulose et permettent la production de non-tissés formés par jet d'air, la production de poussière étant réduite pendant le procédé de production et les propriétés de résistance des non-tissés étant améliorées.
PCT/DK1998/000131 1997-04-08 1998-03-31 Fibres se liant a la cellulose Ceased WO1998045519A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DK98914837T DK0973966T3 (da) 1997-04-08 1998-03-31 Cellulosebindende fibre
KR10-1999-7008843A KR100403057B1 (ko) 1997-04-08 1998-03-31 셀룰로오스 결합 섬유
CA002281802A CA2281802C (fr) 1997-04-08 1998-03-31 Fibres se liant a la cellulose
AU69182/98A AU6918298A (en) 1997-04-08 1998-03-31 Cellulose-binding fibres
JP54226698A JP3672324B2 (ja) 1997-04-08 1998-03-31 セルロース結合繊維
EP98914837A EP0973966B1 (fr) 1997-04-08 1998-03-31 Fibres se liant a la cellulose
IL13158698A IL131586A (en) 1997-04-08 1998-03-31 Cellulose-binding fibres
BR9809749-0A BR9809749A (pt) 1997-04-08 1998-03-31 Fibras com ligação à celulose
DE69808061T DE69808061T2 (de) 1997-04-08 1998-03-31 Cellulose bindende fasern

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DK39497 1997-04-08
DK0394/97 1997-04-08

Publications (1)

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WO1998045519A1 true WO1998045519A1 (fr) 1998-10-15

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JP (1) JP3672324B2 (fr)
KR (1) KR100403057B1 (fr)
CN (1) CN1106469C (fr)
AU (1) AU6918298A (fr)
BR (1) BR9809749A (fr)
CA (1) CA2281802C (fr)
DE (1) DE69808061T2 (fr)
DK (1) DK0973966T3 (fr)
ID (1) ID24606A (fr)
IL (1) IL131586A (fr)
TW (1) TW436535B (fr)
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WO2000029658A1 (fr) * 1998-11-13 2000-05-25 Kimberly-Clark Worldwide, Inc. Toiles non tissees a filaments continus a deux composants modifies avec de la pate
WO2000029657A1 (fr) * 1998-11-13 2000-05-25 Kimberly-Clark Worldwide, Inc. Voiles non tisses biconstituants contenant des filaments thermoplastiques divisables et un troisieme constituant
WO2000031331A1 (fr) * 1998-11-20 2000-06-02 Kimberly-Clark Worldwide, Inc. Structures elastiques absorbantes
WO2000034567A3 (fr) * 1998-12-10 2000-08-10 Kimberly Clark Co Structure absorbante comprenant un composite aerolique calendre fin et procede de fabrication de ce composite
US6368609B1 (en) 1999-04-12 2002-04-09 Kimberly-Clark Worldwide, Inc. Absorbent structure including a thin, calendered airlaid composite and a process for making the composite
US6589892B1 (en) 1998-11-13 2003-07-08 Kimberly-Clark Worldwide, Inc. Bicomponent nonwoven webs containing adhesive and a third component
US6739023B2 (en) 2002-07-18 2004-05-25 Kimberly Clark Worldwide, Inc. Method of forming a nonwoven composite fabric and fabric produced thereof
US7247215B2 (en) 2004-06-30 2007-07-24 Kimberly-Clark Worldwide, Inc. Method of making absorbent articles having shaped absorbent cores on a substrate
US7632258B2 (en) * 2003-03-19 2009-12-15 Kimberly-Clark Worldwide, Inc. Multilayer absorbent article
US7662745B2 (en) 2003-12-18 2010-02-16 Kimberly-Clark Corporation Stretchable absorbent composites having high permeability
US7772456B2 (en) 2004-06-30 2010-08-10 Kimberly-Clark Worldwide, Inc. Stretchable absorbent composite with low superaborbent shake-out
US7938813B2 (en) 2004-06-30 2011-05-10 Kimberly-Clark Worldwide, Inc. Absorbent article having shaped absorbent core formed on a substrate
US8105654B2 (en) 2001-05-28 2012-01-31 Chisso Corporation Thermoadhesive conjugate fibers and nonwoven fabric employing them
US8592329B2 (en) 2003-10-07 2013-11-26 Hollingsworth & Vose Company Vibrationally compressed glass fiber and/or other material fiber mats and methods for making the same
EP2491174A4 (fr) * 2009-10-21 2014-01-08 3M Innovative Properties Co Articles poreux à support intégré et procédés de fabrication
EP2832329A4 (fr) * 2012-03-30 2015-09-09 Unicharm Corp Absorbant et article absorbant le comportant
US11273625B2 (en) 2018-12-21 2022-03-15 The Clorox Company Process for manufacturing multi-layer substrates comprising sandwich layers and polyethylene
US11821141B2 (en) 2018-12-10 2023-11-21 Dow Global Technologies Llc Airlaid substrates having at least one bicomponent fiber

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DE102009055951A1 (de) 2009-11-27 2011-06-01 Glatfelter Falkenhagen Gmbh Absorbierende Struktur
DE102010006228A1 (de) 2010-01-28 2011-08-18 Glatfelter Falkenhagen GmbH, 16928 Flexibles, stark absorbierendes Material
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JPWO2013154072A1 (ja) * 2012-04-10 2015-12-17 ユニ・チャーム株式会社 吸収性物品
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JP6118158B2 (ja) * 2013-03-31 2017-04-19 ユニ・チャーム株式会社 吸収体及びこれを備えた吸収性物品
DE102013014917A1 (de) * 2013-07-15 2015-01-15 Ewald Dörken Ag Bikomponentenfaser zur Herstellung von Spinnvliesen
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CN108547057A (zh) * 2018-03-13 2018-09-18 福建雷尔新材料有限公司 一种含纤维素纤维的热风无纺布制备方法
CN111235686A (zh) * 2020-03-12 2020-06-05 江苏江南高纤股份有限公司 复合超短纤维及其制备方法
CN118835345A (zh) * 2022-11-14 2024-10-25 福建星海通信科技有限公司 一种防翘曲、收缩的纤维素hdpe复合材料细丝的制备方法
KR102655447B1 (ko) * 2023-01-31 2024-04-08 건양대학교 산학협력단 유연성 및 흡착성이 우수한 다용도 복합필터의 제조방법
KR102645082B1 (ko) * 2023-01-31 2024-03-06 건양대학교 산학협력단 흡수성 및 공정성이 우수한 복합부직포의 제조방법

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Cited By (29)

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Publication number Priority date Publication date Assignee Title
US6589892B1 (en) 1998-11-13 2003-07-08 Kimberly-Clark Worldwide, Inc. Bicomponent nonwoven webs containing adhesive and a third component
WO2000029657A1 (fr) * 1998-11-13 2000-05-25 Kimberly-Clark Worldwide, Inc. Voiles non tisses biconstituants contenant des filaments thermoplastiques divisables et un troisieme constituant
WO2000029658A1 (fr) * 1998-11-13 2000-05-25 Kimberly-Clark Worldwide, Inc. Toiles non tissees a filaments continus a deux composants modifies avec de la pate
KR100655841B1 (ko) * 1998-11-13 2006-12-12 킴벌리-클라크 월드와이드, 인크. 펄프로 변형시킨 이성분 연속 필라멘트 부직 웹
US6686303B1 (en) 1998-11-13 2004-02-03 Kimberly-Clark Worldwide, Inc. Bicomponent nonwoven webs containing splittable thermoplastic filaments and a third component
AU760457B2 (en) * 1998-11-13 2003-05-15 Kimberly-Clark Worldwide, Inc. Pulp-modified bicomponent continuous filament nonwoven webs
WO2000031331A1 (fr) * 1998-11-20 2000-06-02 Kimberly-Clark Worldwide, Inc. Structures elastiques absorbantes
US6362389B1 (en) 1998-11-20 2002-03-26 Kimberly-Clark Worldwide, Inc. Elastic absorbent structures
WO2000034567A3 (fr) * 1998-12-10 2000-08-10 Kimberly Clark Co Structure absorbante comprenant un composite aerolique calendre fin et procede de fabrication de ce composite
US6479061B2 (en) 1998-12-10 2002-11-12 Kimberly-Clark Worldwide, Inc. Absorbent structure including a thin, calendered airlaid composite and a process for making the composite
US6368609B1 (en) 1999-04-12 2002-04-09 Kimberly-Clark Worldwide, Inc. Absorbent structure including a thin, calendered airlaid composite and a process for making the composite
US8105654B2 (en) 2001-05-28 2012-01-31 Chisso Corporation Thermoadhesive conjugate fibers and nonwoven fabric employing them
US6739023B2 (en) 2002-07-18 2004-05-25 Kimberly Clark Worldwide, Inc. Method of forming a nonwoven composite fabric and fabric produced thereof
US7632258B2 (en) * 2003-03-19 2009-12-15 Kimberly-Clark Worldwide, Inc. Multilayer absorbent article
US8592329B2 (en) 2003-10-07 2013-11-26 Hollingsworth & Vose Company Vibrationally compressed glass fiber and/or other material fiber mats and methods for making the same
US7662745B2 (en) 2003-12-18 2010-02-16 Kimberly-Clark Corporation Stretchable absorbent composites having high permeability
US7938813B2 (en) 2004-06-30 2011-05-10 Kimberly-Clark Worldwide, Inc. Absorbent article having shaped absorbent core formed on a substrate
US7772456B2 (en) 2004-06-30 2010-08-10 Kimberly-Clark Worldwide, Inc. Stretchable absorbent composite with low superaborbent shake-out
US7247215B2 (en) 2004-06-30 2007-07-24 Kimberly-Clark Worldwide, Inc. Method of making absorbent articles having shaped absorbent cores on a substrate
EP2491174A4 (fr) * 2009-10-21 2014-01-08 3M Innovative Properties Co Articles poreux à support intégré et procédés de fabrication
US8828162B2 (en) 2009-10-21 2014-09-09 3M Innovative Properties Company Porous supported articles and methods of making
US9339581B2 (en) 2012-03-30 2016-05-17 Unicharm Corporation Absorbent and absorbent article provided therewith
EP2832329A4 (fr) * 2012-03-30 2015-09-09 Unicharm Corp Absorbant et article absorbant le comportant
US11821141B2 (en) 2018-12-10 2023-11-21 Dow Global Technologies Llc Airlaid substrates having at least one bicomponent fiber
US11273625B2 (en) 2018-12-21 2022-03-15 The Clorox Company Process for manufacturing multi-layer substrates comprising sandwich layers and polyethylene
US11364711B2 (en) 2018-12-21 2022-06-21 The Clorox Company Multi-layer substrates comprising sandwich layers and polyethylene
US11472164B2 (en) 2018-12-21 2022-10-18 The Clorox Company Multi-layer substrates comprising sandwich layers and polyethylene
US11826989B2 (en) 2018-12-21 2023-11-28 The Clorox Company Multi-layer substrates comprising sandwich layers and polyethylene
US11858238B2 (en) 2018-12-21 2024-01-02 The Clorox Company Process for manufacturing multi-layer substrates comprising sandwich layers and polyethylene

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ID24606A (id) 2000-07-27
DK0973966T3 (da) 2003-01-27
KR20010005771A (ko) 2001-01-15
EP0973966A1 (fr) 2000-01-26
BR9809749A (pt) 2000-06-20
DE69808061T2 (de) 2003-08-14
CA2281802C (fr) 2005-05-24
IL131586A0 (en) 2001-01-28
IL131586A (en) 2003-07-06
CN1259178A (zh) 2000-07-05
CN1106469C (zh) 2003-04-23
AU6918298A (en) 1998-10-30
TW436535B (en) 2001-05-28
CA2281802A1 (fr) 1998-10-15
DE69808061D1 (de) 2002-10-24
EP0973966B1 (fr) 2002-09-18
JP2001518986A (ja) 2001-10-16
JP3672324B2 (ja) 2005-07-20
KR100403057B1 (ko) 2003-10-30

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