EP0379764A1 - Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen - Google Patents

Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen Download PDF

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Publication number
EP0379764A1
EP0379764A1 EP89300803A EP89300803A EP0379764A1 EP 0379764 A1 EP0379764 A1 EP 0379764A1 EP 89300803 A EP89300803 A EP 89300803A EP 89300803 A EP89300803 A EP 89300803A EP 0379764 A1 EP0379764 A1 EP 0379764A1
Authority
EP
European Patent Office
Prior art keywords
warp
web
weft
webs
hot cylinder
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.)
Granted
Application number
EP89300803A
Other languages
English (en)
French (fr)
Other versions
EP0379764B1 (de
Inventor
Haruhisa Tani
Kazuhiko Kurihara
Hiroshi Yazawa
Toshikazu Ohishi
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.)
Polymer Processing Research Institute Ltd
Eneos Corp
Original Assignee
Nippon Petrochemicals Co Ltd
Polymer Processing Research Institute Ltd
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
Priority to CA000589078A priority Critical patent/CA1337110C/en
Application filed by Nippon Petrochemicals Co Ltd, Polymer Processing Research Institute Ltd filed Critical Nippon Petrochemicals Co Ltd
Priority to DE68918928T priority patent/DE68918928T2/de
Priority to EP89300803A priority patent/EP0379764B1/de
Publication of EP0379764A1 publication Critical patent/EP0379764A1/de
Priority to US07/682,987 priority patent/US5232533A/en
Application granted granted Critical
Publication of EP0379764B1 publication Critical patent/EP0379764B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles

Definitions

  • the present invention relates generally to the manufacture of cross-laminated non-woven fabrics, and more particularly to a method and apparatus for heat setting a cross-laminated non-woven fabric composed of warp and weft webs as they are bonded on and around a hot cylinder.
  • warp web is used to refer to a web formed of fibers arranged to extend substantially in the lengthwise direction of the web and hence having a larger strength in the lengthwise direction than in the transverse direction thereof
  • weft web is used to refer to a web formed of fibers arranged to extend substantially in the transverse direction of the web and hence having a larger strength in the transverse direction than in the lengthwise direction
  • cross-laminated non-woven fabric is used to refer to a non-woven fabric composed of the warp and weft webs laminated together, with the fibers in the warp web extending crosswise the fibers in the weft web.
  • cross-laminated non-woven fabrics, cross-laminated films or the like cross-laminated sheet materials have recently been developed and placed on the market.
  • warp and weft webs are bonded together into layers.
  • a hot cylinder is utilized in general.
  • the hot cylinder has the advantage of its small installation space and high heat efficiency.
  • the hot cylinder has a drawback however that the warp and weft webs while being heat-set on the hot cylinder are caused to shrink widthwise. This widthwise shrinkage lowers the productivity of the cross-laminated sheet material and also adversely affects the strength, Young's modulus and other physical properties of the cross-laminated sheet material.
  • the foregoing widthwise shrinkage of the webs while being heat-set can be prevented by using a conventional tentering process in which the webs are held firmly at the opposite sides or selvages by pins or clips.
  • the tentering process requires an expensive apparatus which is large in size and hence occupies a large space for installation thereof.
  • Another problem is that a hot air heating system employed in the tenter frame is low in thermal efficiency.
  • the tentering process is totally unsatisfactory when used in the manufacture of a cross-laminated sheet material in which bonding of warp and weft webs is major requirement.
  • the present invention seeks to provide a method of making a cross-laminated sheet material composed of warp and weft webs bonded together into layers and heat set on a hot cylinder without causing widthwise shrinkage which would otherwise lower the productivity and physical properties of the cross-laminated sheet material.
  • the present invention further seeks to provide an apparatus for reducing the foregoing method into practice, which apparatus is simple in construction and can be manufactured less costly, and is small in size and occupies only a small space for installation thereof.
  • a method of making a cross-laminated non-woven fabric of the type in which a warp web having a larger strength in the lengthwise direction than in the transverse direction and a weft web having a larger strength in the transverse direction than in the lengthwise direction are bonded together and heat-set while they are continuously fed around a rotating hot cylinder wherein the improvement comprises: holding the warp and weft webs in superposed relation to one another by gripping at least their opposite selvages by and between an outer peripheral surface of the rotating hot cylinder and a pair of parallel spaced endless belts held under tension against the outer peripheral surface of the rotating hot cylinder, thereby preventing the superposed warp and weft webs from shrinking widthwise as they are heat-set on the hot cylinder.
  • an apparatus for making a cross-laminated non-woven fabric of the type having a rotating hot cylinder for bonding and heat-setting a warp web having a larger strength in the lengthwise direction than in the transverse direction and a weft web having a larger strength in the transverse direction than in the lengthwise direction as they are continuously fed around the rotating hot cylinder in a superposed relation to one another, wherein the improvement comprises: an endless belt held under tension against an outer peripheral surface of the rotating hot cylinder for gripping at least opposite selvages of the warp and weft webs therebetween as the warp and weft webs are fed around the hot cylinder, thereby preventing the warp and weft webs from shrinking widthwise as they are heat-set on the hot cylinder.
  • Figure 1 diagrammatically shows the general construction of an apparatus for making a cross-laminated non-woven fabric or the like sheet material by bonding and heat-setting a warp web 1 and a weft web 2 as they are continuously fed on and along an outer peripheral surface of a hot cylinder 3 rotatably driven by a motor (not shown). At least one of the warp and weft webs 1, 2 has a certain degree adhesiveness or is treated with an adhesive.
  • the apparatus further includes first and second pinch or nip rolls 4, 5 held in contact with the hot cylinder 3 and having their central axes spaced from one another at an angle of about 60 degrees relative to the central axis of the hot cylinder 3 so as to guide the warp and weft webs 1, 2 along about five-sixths of the full circumference of the hot cylinder 3.
  • a cooling cylinder 6 Disposed downstream of the second nip roll 5 is a cooling cylinder 6 for cooling a cross-laminated sheet material composed of the warp and weft webs 1, 2 which have been bonded together and heat-set on the hot cylinder 3.
  • the cooling cylinder 6 is provided with a third pinch or nip roll 7 for holding the cross-laminated sheet material in intimate contact with the cooling cylinder 6 as the cross-laminated sheet material is withdrawn from the cooling cylinder 6.
  • the warp and weft webs 1, 2 are gripped at least at opposite sides or selvages while they are fed around the hot cylinder 3 in superposed relation, so that the warp and weft webs 1, 2 are prevented from shrinking widthwise.
  • the apparatus includes a pair of parallel spaced endless belts 8, 8 guided around the first nip roll 4 and first, second and third guide rolls 9a, 9b, 9c so as to be held under tension against the outer peripheral surface of the hot cylinder 3.
  • the third guide roll 9c is disposed upstream of the second nip roll 5 and circumferentially spaced at an angle of about 60 degrees from the second nip roll 5 so that the endless belts 8 travel about four-fifths of a longitudinal portion of the superposed warp and weft webs 1, 2 which is retained on the hot cylinder 3.
  • the endless belts 8 may be arranged to further extend around the second nip roll 5 in which instance the endless belts 8 coextend with the respective selvages of the warp and weft webs 1, 2 retained on the hot cylinder 3.
  • the endless belts 8 are made of a heat-resistant material so as to withstand a temperature of the hot cylinder 3. As shown in Figure 3, each of the endless belts 8 has a release coating layer 8a on one surface thereof which is engageable with the outermost web 1.
  • the release coating layer 8a preferably comprises a fluorine plastic film or a silicone plastic film.
  • Materials eligible for the warp web 1 includes a web of stretched or oriented tapes arranged in parallel juxtaposition in the lengthwise direction of the web, a reticular split fiber web spread widthwise 1.1 - 5.0 times its original width, and a non-woven fabric formed of fibers arranged to extend in the lengthwise directions.
  • the weft web includes a laminated web which is composed of a continuous warp web of parallel-laid non-woven fabric, and a succession of discrete weft webs of parallel laid non woven fabric arrange lengthwise of and bonded with the continuous warp web, with their adjacent edges slightly overlapping one another.
  • the laminated web may be made by a cross-laminating machine such as disclosed in U. S. Patent No. 4,052,243 proposed by the present inventors.
  • a weft web is conveyed laterally over the warp web in the machine direction and overlaid onto the warp web in the manner of side by side arrangement without leaving any gaps between each other, after being cut by the length corresponding to the width of the warp web.
  • one of two identical continuous warp webs of parallel laid non-woven fabric is fed transversely over the other warp web in timed relation to the movement of the other warp web.
  • the one warp web is severed successively into individual lengths which are substantially equal to the width of the other warp webs.
  • the thus severed individual lengths of warp web are united by bonding to the other warp web with their adjacent edges slightly overlapping one another, as stated above.
  • the weft web may be a continuous transversely stretched web such as disclosed in U. S. Patnt No. 4,349,500, or a non-woven fabric formed of fibers arranged to extend in the widthwise or transverse directions.
  • the warp and weft webs 1, 2 are longitudinally fed successively around the first nip roll 4, the hot cylinder 3 and the second nip roll 5. During that time, the warp and weft webs 1, 2 are firmly gripped at their opposite selvages by and between the outer peripheral surface of the hot cylinder 3 and the respective endless belts 8, 8 with the result the warp and weft webs 1, 2 are heat-bonded together into a cross-laminated sheet material and heat-set on the hot cylinder 3 without causing heat-shrinkage in the widthwise direction.
  • the cross-laminated sheet material is withdrawn from the hot cylinder 3 and then fed around the cooling cylinder 6 during which time the cross-laminated sheet material is cooled to set. The thus cooled cross-laminated sheet material is finally withdrown from the apparatus through the third nip roll 7.
  • a modified apparatus shown in Figure 4 is substantially identical to the apparatus shown in Figures 1 and 2 with the exception that the superposed warp and weft webs 1, 2 are gripped substantially throughout the width thereof by and between the outer peripheral surface of the hot cylinder 3 and a single endless belt 10.
  • the endless belt 10 has substantially the same width as the webs 1, 2 and includes a multiplicity of small pores or perforations 11 uniformly distributed over the entire surface thereof.
  • the perforated endless belt 10 is permeable to vapor and hence allows smooth vaporization of the moisture content from the webs 1, 2 as the webs 1, 2 are heat-set on the hot cylinder 3.
  • the selvages of warp and weft webs are gripped by and between the outer peripheral surface of a hot cylinder and two endless belts, so that the warp and weft webs are bonded together into a cross-laminated sheet material and heat-set without causing widthwise heat-shrinkage.
  • the thus produced cross-laminated sheet material is sightly in appearance, is uniform in structure and posesses improved physical properties such as tensile strength and Young's modulus.
  • the apparatus of the present invention which is composed of a hot cylinder and endless belts is simple in construction and hence can be manufactured easily at a low cost. Furthermore, the apparatus is small in size and hence occupies only a small space for installation thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)
EP89300803A 1989-01-25 1989-01-27 Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen Expired - Lifetime EP0379764B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA000589078A CA1337110C (en) 1989-01-25 1989-01-25 Method and apparatus for making cross-laminated non-woven fabrics
DE68918928T DE68918928T2 (de) 1989-01-25 1989-01-27 Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen.
EP89300803A EP0379764B1 (de) 1989-01-25 1989-01-27 Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen
US07/682,987 US5232533A (en) 1989-01-25 1991-04-10 Method for heat-setting cross-laminated non-woven fabrics

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000589078A CA1337110C (en) 1989-01-25 1989-01-25 Method and apparatus for making cross-laminated non-woven fabrics
EP89300803A EP0379764B1 (de) 1989-01-25 1989-01-27 Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen

Publications (2)

Publication Number Publication Date
EP0379764A1 true EP0379764A1 (de) 1990-08-01
EP0379764B1 EP0379764B1 (de) 1994-10-19

Family

ID=25672405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89300803A Expired - Lifetime EP0379764B1 (de) 1989-01-25 1989-01-27 Verfahren und Gerät zur Herstellung von kreuzgelegten Vliesstoffen

Country Status (3)

Country Link
EP (1) EP0379764B1 (de)
CA (1) CA1337110C (de)
DE (1) DE68918928T2 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1505969A (fr) * 1965-06-08 1967-12-15 Union Carbide Corp Filet non tissé et machine et procédé pour le fabriquer
US4052243A (en) * 1975-01-28 1977-10-04 Polymer Processing Research Institute Ltd. Method for producing a cross-laminated cloth-like product from wide warp and weft webs
US4609423A (en) * 1983-11-08 1986-09-02 Stork Brabant Bv Apparatus for making a web of plastic material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1505969A (fr) * 1965-06-08 1967-12-15 Union Carbide Corp Filet non tissé et machine et procédé pour le fabriquer
US4052243A (en) * 1975-01-28 1977-10-04 Polymer Processing Research Institute Ltd. Method for producing a cross-laminated cloth-like product from wide warp and weft webs
US4609423A (en) * 1983-11-08 1986-09-02 Stork Brabant Bv Apparatus for making a web of plastic material

Also Published As

Publication number Publication date
DE68918928D1 (de) 1994-11-24
EP0379764B1 (de) 1994-10-19
CA1337110C (en) 1995-09-26
DE68918928T2 (de) 1995-03-30

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