WO1998007907A1 - Produits files eclair - Google Patents

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Publication number
WO1998007907A1
WO1998007907A1 PCT/US1997/014518 US9714518W WO9807907A1 WO 1998007907 A1 WO1998007907 A1 WO 1998007907A1 US 9714518 W US9714518 W US 9714518W WO 9807907 A1 WO9807907 A1 WO 9807907A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet material
material according
polymer
cla
orifice
Prior art date
Application number
PCT/US1997/014518
Other languages
English (en)
Inventor
Larry Ray Marshall
Original Assignee
E.I. Du Pont De Nemours And Company
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 claimed from US08/825,266 external-priority patent/US5851936A/en
Application filed by E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to EP97938395A priority Critical patent/EP0918889B1/fr
Priority to DE69731211T priority patent/DE69731211T2/de
Priority to JP51087598A priority patent/JP4083808B2/ja
Publication of WO1998007907A1 publication Critical patent/WO1998007907A1/fr

Links

Classifications

    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/11—Flash-spinning
    • 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
    • D04H1/724—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 forming webs during fibre formation, e.g. flash-spinning

Definitions

  • This invention relates to flash-spun plexifilaments and particularly to nonwoven flash-spun sheets or fabrics made with flash-spun plexifilaments.
  • Tyvek® spunbonded olefin is used as a fabric for garments, especially for use in protective apparel for chemical or hazardous exposure, as an air infiltration barrier for construction applications, as medical packaging, and also for envelopes such as overnight express envelopes. New applications for Tyvek® spunbonded olefin are always being considered and developed.
  • Break elongation is the percentage the sheet material stretches before it breaks. It is desirable to increase break elongation to provide the nonwoven sheets with some give prior to breaking. For example, as a garment for protective apparel, the wearer may stretch his arm outwards from the body and then bend it at the elbow. If the garment is at all tight fitting, the fabric of sleeve, under this circumstance, would be stretched. However, it is preferred that the fabric give or yield rather than rip or break. High break elongation also tends to increase another related property called toughness. In general toughness is a measure of a combination of tensile strength and break elongation. Materials that have high toughness tend to have substantial tensile strength with the ability to stretch before failure.
  • a sheet material having an opacity greater than 85%, a basis weight greater than 30 g/m 2 but less than 100g/m 2 , a Spencer puncture greater than 20 in-lb/in 2 and an average break elongation of greater than about 30%.
  • the invention further relates to a process for flash spinning polymer and forming sheet material therefrom, the improvement comprising mixing the polymer in a hydrocarbon spin agent at a ratio of less than about 16% polymer, and emitting the polymer solution through a spin orifice at a temperature of at least about 180°C, wherein the spin orifice has a length to diameter ratio of at least 2.0.
  • the invention further relates to an improvement to flash- spun fabrics by spinning a polymer solution through a spin orifice having a length to diameter ratio of at least 2.0 and including an inline mixer in a letdown process prior to the spinning orifice.
  • Figure 1 a schematic cross sectional view of a spin cell illustrating the basic process for making flash-spun nonwoven products
  • Figure 2 is an enlarged cross sectional view of the spinning equipment for flash spinning fiber.
  • the basic process is illustrated in Figure 1 and is similar to that disclosed in U.S. Patent 3,860,369 to Brethauer et al., which is hereby incorporated by reference.
  • the flash-spinning process is normally conducted in a chamber 10, sometimes referred to as a spin cell, which has an exhaust port 1 1 for exhausting the spin cell atmosphere to a spin agent recovery system and an opening 12 through which non-woven sheet material produced in the process is removed.
  • a solution of polymer and spin agent is provided through a pressurized supply conduit 13 to a letdown orifice 15 and into a letdown chamber 16.
  • the pressure reduction in the letdown chamber 16 precipitates the nucleation of polymer from a polymer solution, as is disclosed in U.S. Patent 3,227,794 to Anderson et al.
  • One option for the process is to include an inline static mixer 36 (see Figure 2) in the letdown chamber 16.
  • a suitable mixer is available from Koch Engineering Company of Wichita Kansas as Model SMX.
  • a pressure sensor 22 may be provided for monitoring the pressure in the chamber 16.
  • the polymer mixture in chamber 16 next passes through spin orifice 14.
  • the quenching of the polymer freezes the linear orientation of the polymer molecule chains in place, which contributes to the strength of the resulting flash-spun plexifilamentary polymer structure.
  • the polymer strand 20 discharged from the spin orifice 14 is conventionally directed against a rotating lobed deflector baffle 26.
  • the rotating baffle 26 spreads the strand 20 into a more planar web structure 24 that the baffle alternately directs to the left and right.
  • the web is passed through an electric corona generated between an ion gun 28 and a target plate 30.
  • the corona charges the web so as to hold it in a spread open configuration as the web 24 descends to a moving belt 32 where the web forms a batt 34.
  • the belt is grounded to help insure proper pinning of the charged web 24 on the belt.
  • the fibrous batt 34 is passed under a roller 31 that compresses the batt into a sheet 35 formed with plexifilamentary film-fibril networks oriented in an overlapping multi-directional configuration.
  • the sheet 35 exits the spin chamber 10 through the outlet 12 before being collected on a sheet collection roll 29.
  • the sheet 35 is subsequently run through a finishing line which treats and bonds the material appropriate for its end use.
  • a significant part of the Tyvek product line is hard product which is pressed on a smooth heated bonder roll.
  • the hard product has the feel of slick paper and is used commonly in overnight mailing envelopes and for air infiltration barriers in construction applications.
  • both sides of the sheet are subjected to generally uniform, full surface contact thermal bonding.
  • the sheet 35 is typically point bonded to have a softer, fabric like feel. The intent is to provide closely spaced bonding points with unbonded fiber therebetween in an aesthetically pleasing pattern.
  • one aspect of the present invention relates to the size and shape of the spin orifice 14.
  • the spin orifice 14 may be characterized as having a length to diameter ratio.
  • the diameter of the spin orifice 14 is indicated by the letter "d”.
  • the length of the spin orifice 14 is indicated in the figure by the letter "/” and relates to the length of the spin orifice which has the diameter " ⁇ _"'.
  • the conventional spin orifice has a length to diameter ratio of 0.9. Thus the length of the orifice is slightly less than its diameter. It has been found that a spin orifice that is much longer than its diameter creates webs that when laid down into fabric sheets have much higher elongation properties. This will be further discussed in relation to examples below.
  • Gurley Hill Porosity is a measure of the barrier strength of the sheet material for gaseous materials. In particular, it is a measure of how long it takes for a volume of gas to pass through an area of material wherein a certain pressure gradient exists.
  • Gurley-Hill porosity is measured in accordance with TAPPI T-460 om-88, which is hereby incorporated by reference, using a Lorentzen & Wettre Model 12 ID Densometer. This test measures the time of which 100 cubic centimeters of air is pushed through a one inch diameter sample under a pressure of approximately 4.9 inches of water. The result is expressed in seconds and is usually referred to as Gurley Seconds.
  • ASTM refers to the American Society of Testing Materials
  • TAPPI refers to the Technical Association of Pulp and Paper Industry.
  • Elongation to Break of a sheet is a measure of the amount a sheet stretches prior to failure (breaking) in a strip tensile test.
  • a 1.0 inch (2.54 cm) wide sample is mounted in the clamps - set 5.0 inches ( 12.7 cm) apart - of a constant rate of extension tensile testing machine such as an Instron table model tester.
  • a continuously increasing load is applied to the sample at a crosshead speed of 2.0 in/ min (5.08 cm/min) until failure. The measurement is given in percentage of stretch prior to failure.
  • the test generally follows ASTM Dl 682-64, which is hereby incorporated by reference. Average elongation to break or average break elongation is the average of the cross directional break elongation and the machine direction break elongation.
  • Opacity relates to how much light is permitted to pass through a sheet.
  • One of the qualities of Tyvek® sheet is that it is opaque and one cannot see through it.
  • Opacity is the measure of how much light is reflected or the inverse of how much light is permitted to pass through a material. It is measured as a percentage of light reflected.
  • Hydrostatic Head is a measure of the resistance of the sheet to penetration by liquid water under a static load.
  • a 7x7 in (17.78x17.78 cm) sample is mounted in a SDL 18 Berry Hydrostatic Head Tester
  • Examples 1-7, Tables I and II were formed in the hydrocarbon spin agent system with high density polyethylene, a spin orifice L/D ratio of 5.1 and point bonded with a linen and "P" point pattern at 5515 kPascals (800 psi) on a 34" bonding calendar with steam pressure at 483 kPascals-gauge (70 psig) without mechanical softening.
  • Examples 8-14, Tables III and IV were formed in the hydrocarbon spin agent system with high density polyethylene, a spin orifice L/D ratio of 5.1 and point bonded with a rib and bar pattern at 551 5 kPascals (800 psi) on a 34" bonding calendar with steam pressure at 483 kPascals-gauge (70 psig) without mechanical softening.
  • Examples 15-22, Tables V and IV were formed in the hydrocarbon spin agent system with high density polyethylene, a spin orifice L/D ration of 5.1 and area bonded using a thermal bonder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Artificial Filaments (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

L'invention a trait à des propriétés d'élongation améliorées de fibrilles-film plexifilamentaires filées éclair. La technique permettant d'obtenir ces propriétés améliorées consiste à accroître le rapport longueur-diamètre de l'orifice de filage, et de réduire la proportion de polymère dans la solution de filage.
PCT/US1997/014518 1996-08-19 1997-08-19 Produits files eclair WO1998007907A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97938395A EP0918889B1 (fr) 1996-08-19 1997-08-19 Produits files eclair
DE69731211T DE69731211T2 (de) 1996-08-19 1997-08-19 Durch flash-spinnen hergestellte produkte
JP51087598A JP4083808B2 (ja) 1996-08-19 1997-08-19 フラッシュ紡糸生成物

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US69928196A 1996-08-19 1996-08-19
US08/699,281 1996-08-19
US08/825,266 1997-03-27
US08/825,266 US5851936A (en) 1996-08-19 1997-03-27 Elongation for flash spun products

Publications (1)

Publication Number Publication Date
WO1998007907A1 true WO1998007907A1 (fr) 1998-02-26

Family

ID=27106379

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/014518 WO1998007907A1 (fr) 1996-08-19 1997-08-19 Produits files eclair

Country Status (5)

Country Link
EP (1) EP0918889B1 (fr)
JP (1) JP4083808B2 (fr)
CA (1) CA2260862A1 (fr)
DE (1) DE69731211T2 (fr)
WO (1) WO1998007907A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999025911A1 (fr) * 1997-11-14 1999-05-27 Eduard Küsters Maschinenfabrik GmbH & Co. KG Procede et calandre pour traiter une bande
US7786034B2 (en) * 2003-04-03 2010-08-31 E.I. Du Pont De Nemours And Company Rotary process for forming uniform material
CN113355755A (zh) * 2020-12-15 2021-09-07 浙江青昀新材料科技有限公司 闪蒸法制备的聚合物片材
CN115142142A (zh) * 2022-06-24 2022-10-04 厦门当盛新材料有限公司 一种喷头及设有该喷头的闪蒸纺丝设备
CN116590846A (zh) * 2023-07-11 2023-08-15 江苏青昀新材料有限公司 一种具有较佳韧度的闪纺聚乙烯膜材料及其制造方法
CN117449037A (zh) * 2023-12-26 2024-01-26 江苏青昀新材料有限公司 一种闪纺膜材及其制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020212266B4 (de) * 2020-09-29 2023-11-16 Abf Diagnostics Gmbh Mit vliesstoff verschlossener behälter
DE102022001897A1 (de) 2022-05-31 2023-11-30 Oerlikon Textile Gmbh & Co. Kg Schmelzblasdüsenvorrichtung und Verfahren zur Herstellung einer Vielzahl von Fasersträngen aus einer Polymerschmelze

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774387A (en) * 1970-09-11 1973-11-27 Du Pont Hydrophilic textile products
US4554207A (en) * 1984-12-10 1985-11-19 E. I. Du Pont De Nemours And Company Stretched-and-bonded polyethylene plexifilamentary nonwoven sheet
DE3826621A1 (de) * 1988-08-05 1990-02-08 Akzo Gmbh Spinnduesenplatte
US5250237A (en) * 1992-05-11 1993-10-05 E. I. Du Pont De Nemours And Company Alcohol-based spin liquids for flash-spinning polymeric plexifilaments

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774387A (en) * 1970-09-11 1973-11-27 Du Pont Hydrophilic textile products
US4554207A (en) * 1984-12-10 1985-11-19 E. I. Du Pont De Nemours And Company Stretched-and-bonded polyethylene plexifilamentary nonwoven sheet
DE3826621A1 (de) * 1988-08-05 1990-02-08 Akzo Gmbh Spinnduesenplatte
US5250237A (en) * 1992-05-11 1993-10-05 E. I. Du Pont De Nemours And Company Alcohol-based spin liquids for flash-spinning polymeric plexifilaments

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999025911A1 (fr) * 1997-11-14 1999-05-27 Eduard Küsters Maschinenfabrik GmbH & Co. KG Procede et calandre pour traiter une bande
US6395211B1 (en) 1997-11-14 2002-05-28 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Method and calender for treating a sheet
US7786034B2 (en) * 2003-04-03 2010-08-31 E.I. Du Pont De Nemours And Company Rotary process for forming uniform material
KR101272425B1 (ko) * 2003-04-03 2013-06-07 이 아이 듀폰 디 네모아 앤드 캄파니 균일한 물질을 형성하기 위한 회전식 공정
CN113355755A (zh) * 2020-12-15 2021-09-07 浙江青昀新材料科技有限公司 闪蒸法制备的聚合物片材
CN115142142A (zh) * 2022-06-24 2022-10-04 厦门当盛新材料有限公司 一种喷头及设有该喷头的闪蒸纺丝设备
CN115142142B (zh) * 2022-06-24 2024-01-12 厦门当盛新材料有限公司 一种喷头及设有该喷头的闪蒸纺丝设备
CN116590846A (zh) * 2023-07-11 2023-08-15 江苏青昀新材料有限公司 一种具有较佳韧度的闪纺聚乙烯膜材料及其制造方法
CN116590846B (zh) * 2023-07-11 2023-10-20 江苏青昀新材料有限公司 一种具有较佳韧度的闪纺聚乙烯膜材料及其制造方法
CN117449037A (zh) * 2023-12-26 2024-01-26 江苏青昀新材料有限公司 一种闪纺膜材及其制造方法
CN117449037B (zh) * 2023-12-26 2024-03-15 江苏青昀新材料有限公司 一种闪纺膜材及其制造方法

Also Published As

Publication number Publication date
JP2002501580A (ja) 2002-01-15
EP0918889B1 (fr) 2004-10-13
DE69731211T2 (de) 2006-03-09
JP4083808B2 (ja) 2008-04-30
CA2260862A1 (fr) 1998-02-26
EP0918889A1 (fr) 1999-06-02
DE69731211D1 (de) 2004-11-18

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