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WO2008120959A1 - Appareil et procédé de perforation d'une bande non tissée, bande non tissée obtenue par ce procédé - Google Patents

Appareil et procédé de perforation d'une bande non tissée, bande non tissée obtenue par ce procédé Download PDF

Info

Publication number
WO2008120959A1
WO2008120959A1 PCT/KR2008/001885 KR2008001885W WO2008120959A1 WO 2008120959 A1 WO2008120959 A1 WO 2008120959A1 KR 2008001885 W KR2008001885 W KR 2008001885W WO 2008120959 A1 WO2008120959 A1 WO 2008120959A1
Authority
WO
WIPO (PCT)
Prior art keywords
woven fabric
roller
perforating
rollers
outer circumferential
Prior art date
Application number
PCT/KR2008/001885
Other languages
English (en)
Inventor
Jae Hun Shim
Jae Hun Lee
Original Assignee
Jae Hun Shim
Jae Hun Lee
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 Jae Hun Shim, Jae Hun Lee filed Critical Jae Hun Shim
Priority to CN200880010240A priority Critical patent/CN101688344A/zh
Priority to JP2010502023A priority patent/JP2010523834A/ja
Priority claimed from KR1020080031257A external-priority patent/KR101004214B1/ko
Publication of WO2008120959A1 publication Critical patent/WO2008120959A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/24—Perforating by needles or pins

Definitions

  • the present invention relates to an apparatus for perforating non-woven fabric, a method of perforating non-woven fabric, and non- woven fabric prepared by the apparatus and method.
  • the present invention relates to an apparatus for perforating non- woven fabric which can easily and rapidly form a plurality of apertures in the surface of non- woven fabric and which thus improves cost efficiency, a method of perforating non- woven fabric, and a non- woven fabric prepared using the same apparatus and employing the same method.
  • Non- woven fabric is fabric produced by arranging fibers parallel to each other or in irregular directions and combining the arranged fibers together into a sheet shape using synthetic resin adhesive instead of employing a weaving processing or a knitting process.
  • the material for the non-woven fabric was cotton in early years, but synthetic resin, such as polypropylene and nylon, has been used since the mid- 1950.
  • non-woven fabric processing methods including a thermal bonding process in which fibers are formed by extruding synthetic resin through nozzles and the fibers are thermally bonded, a dipping process, and a dry process.
  • the dipping process is also called a paper manufacturing type process. That is, fibers are dipped into and thus wet with synthetic resin adhesive and then dried with heat, so that the product is similar to paper.
  • synthetic resin is ejected to thin cotton- shaped fibers and then the fibers and resin are dried with heat.
  • non-woven fabric Since the mid- 1950, non- woven fabric has been developed rapidly in America and used for various purposes since the non- woven fabric has no directionality and the edges, when cut, do not fray due to the tangling of fibers. Further, non- woven fabric is used industrially nowadays. Recently, non-woven fabric produced by the thermal bonding process, in which synthetic resin is extruded through nozzles to produce fibers and the fibers are thermally bonded, is the most widely used.
  • non- woven fabric for a lining is applied to a part which directly contacts body parts, such as disposable sanitary napkins, diapers, etc.
  • Such non- woven fabric for lining must have a soft texture and a beautiful appearance and must be hygroscopic and cushiony, and thus is expensive to manufacture.
  • cleaning cloths products for absorbing sweat from the forehead of people who exercise, and products which are used in a state of being in contact with a body part or being attached to a body part, the use of the perforated non-woven fabric will be increased.
  • EP 0472992 discloses perforated non-woven fabric having increased hygroscopic and cushiony characteristics in comparison with normal non- woven fabric by forming a plurality of apertures in the normal non- woven fabric.
  • EP 0472992 discloses a structure in which non- woven fabric passes through gaps between a first roller, having a plurality of pins, and a second roller, having a plurality of grooves, so that a plurality of apertures is formed in the non- woven fabric by the penetration of the pins, and the perimeters of the apertures bulge.
  • the known technique has disadvantages of low productivity and low cost efficiency because it is difficult to increase the rotation speed of the first and second rollers to 20m/min or more in order to improve the appearance of the apertures, the hygroscopic property, and the cushiony property.
  • the invention is conceived in order to solve the above-mentioned problems of the known technique, and an object of the invention is to provide an apparatus for perforating non- woven fabric, which is capable of rapidly forming a plurality of apertures in the non-woven fabric at lost cost, i.e. which has increased productivity and cost efficiency, a method of perforating non-woven fabric, and a non-woven fabric prepared employing the same apparatus and method.
  • a further object of the invention is to provide an apparatus for perforating non- woven fabric, which is capable of improving softness, the cushiony property, the hygroscopic property, and the washability of the non- woven fabric, a method of perforating non-woven fabric, and a non-woven fabric prepared employing the same apparatus and method.
  • a still further object of the invention is to provide an apparatus for perforating non- woven fabric and a method of perforating non- woven fabric, the apparatus and the method being capable of improving quality, productivity, and cost efficiency of a perforated non- woven fabric used in a state of being in direct contact with or directly attached to a body part.
  • an apparatus for perforating non- woven fabric including a first roller having a plurality of pins formed on the surface thereof and being rotatable, and two or more second rollers which are arranged on the outer circumferential surface of the first roller in a circumferential direction and which rotate relative to the outer circumferential surface of the first roller.
  • each of the second rollers have a plurality of grooves, each having an inner diameter larger than that of each of the pins of the first roller.
  • each of the second rollers have a brush on the outer surface thereof.
  • each of the second rollers be made of an elastic material or a material having a plurality of pores therein.
  • a method of perforating non- woven fabric including a step of preparing one or more rolls of non- woven fabric, a step of preparing a first roller having a plurality of pins and two or more second rollers arranged on the outer surface of the first roller, and a step of allowing the respective rolls of non- woven fabric to pass through corresponding gaps between the first roller and the corresponding second rollers, which are rotating.
  • a method of perforating non- woven fabric including a step of preparing a roll of non- woven fabric, a step of preparing a first roller having a plurality of pins and two or more second rollers arranged on the outer surface of the first roller, and a step of allowing the roll of non- woven fabric to sequentially pass through gaps between the first roller and the second rollers so that the non-woven fabric is perforated two or more times.
  • a method of perforating non- woven fabric including a step of preparing one or more rolls of non- woven fabric, a step of preparing two or more opposing roller groups, each opposing roller group including two or more second rollers provided on the outer surface of the first roller, and a step of allowing the respective rolls of non- woven fabric to sequentially pass through corresponding gaps between the first roller and the second rollers.
  • the first roller rotate at a speed in the range from 1 to 150 m/min, and more preferable that the first roller rotate at a low speed in the range from 1 to 50 m/min, taking the criteria for non- woven fabric for personal goods into consideration.
  • a non- woven fabric with a plurality of apertures which is prepared by employing the apparatus for and method of perforating non- woven fabric.
  • the total area of the apertures be about
  • the density of the apertures be I/inch or more. It is more preferable that the total area of the apertures be about 1 to 50% of the entire surface area thereof, and that the density of the apertures be about 30/inch or more.
  • the non-woven fabric be a product which directly contacts a body part of a human or a patch which is directly attached to a product that directly contacts a body part of a human.
  • the non- woven fabric be used as a lining of a disposal sanitary napkin or a disposal diaper.
  • the non- woven fabric be applied as a cleaning cloth or an agricultural product.
  • the invention is advantageous in that it is possible to rapidly form a plurality of apertures in the surface of a non- woven fabric at low cost, and thus it is possible to improve the productivity and cost efficiency of a perforated non-woven fabric.
  • the invention is further advantageous in that it is possible to improve smoothness, the cushiony property, the washability, and the hygroscopic property of non-woven fabric.
  • FIG. 1 is a view illustrating an apparatus for perforating non- woven fabric according to a first embodiment of the invention
  • FIG. 2 is an enlarged sectional view illustrating part A in FIG. 1 ;
  • FIG. 3 is an enlarged sectional view illustrating part "A" shown in FIG. 2, according to another embodiment;
  • FIG. 4 is a view illustrating an apparatus for perforating non- woven fabric according to a second embodiment of the invention;
  • FIG. 5 is a view illustrating an apparatus for perforating non-woven fabric according to a third embodiment of the invention.
  • FIG. 6 is a sectional view illustrating non- woven fabric according to the invention.
  • FIG. 1 shows an apparatus for perforating non- woven fabric according to a first embodiment of the invention, and a method of perforating non- woven fabric.
  • an apparatus 10 for perforating non-woven fabric includes a first roller 11 having a plurality of pins 15 and two or more section rollers arranged on the outer circumferential surface of the first roller 11 so as to rotate relative to the first roller 11.
  • the outer circumferential surface of the first roller 11 is provided with the plurality of pins 15.
  • the number of pins 15 is about 30/inch , and the diameter of each of the pins 15 ranges from about 0.2 to 5 mm. More preferably, the diameter of each of the pins 15 ranges from about 1 to 3 mm.
  • each of the pins 15 is about 1 mm or more, and more preferably the length of each of the pins 15 is about 2 to 5 mm.
  • Each pin 15 has a tip portion 15a at one end thereof, and apertures 16 are formed as the tip portions 15a of the pins 15 penetrate through the non-woven fabric.
  • the second roller 12 has grooves 12a into which the pins 15 are inserted.
  • the inner diameter of the groove 12a is larger than the outer diameter of the pin 15, and the number of grooves 12a is equal to the number of pins 15.
  • each of the second rollers 12 may be provided with a brush, or may be made of an elastic material, such as rubber.
  • the outer surface of the second roller 12 may be made of a porous material having a plurality of pores, such as a sponge gourd. That is, the outer surface of the second roller 12 receives portions of non- woven fabric which are pressed by the pins 15 of the first roller 11 when the non- woven fabric is penetrated by the pins 15 of the first roller 11, and than the surface state of the non- woven fabric is recovered.
  • a method of perforating non- woven fabric according to a first embodiment includes a step of preparing one or more rolls of non- woven fabric Nl.
  • the non- woven fabric Nl may be polypropylene (PP) spun-bond non- woven fabric, mixed non- woven fabric (SMS, SMMS, etc.) of polypropylene spun-bond and melt-blown non- woven fabric, bi-component spun-bond non- woven fabric, which is a mixture of polypropylene and polyethylene, spun-laced non- woven fabric, air-through processed non- woven fabric, polypropylene thermal-bond non- woven fabric, thermal-bond non- woven fabric of a mixture of polypropylene and other yarn, polyester non- woven fabric, etc.
  • PP polypropylene
  • SMS mixed non- woven fabric
  • bi-component spun-bond non- woven fabric which is a mixture of polypropylene and polyethylene, spun-laced non- woven fabric, air-through processed non- woven
  • the prepared non- woven fabric Nl is passed through between the first roller 11 and the second rollers 12. As a result, as shown in FIGs. 2 and 3, the pins 15 of the first roller 11 penetrate through the surface of each roll of the non- woven fabric, and thus perforated non- woven fabric N2 having a plurality of apertures 16 is produced.
  • FIG. 4 shows a method of perforating non- woven fabric according to a second embodiment of the invention.
  • the method of perforating non- woven fabric according to the second embodiment may include a step of preparing a single roll of non- woven fabric Nl, and a step of sequentially allowing the single roll of non- woven fabric Nl to pass through gaps between the first roller 11 and the second rollers 12, so that the single roll of non- woven fabric Nl is repeatedly perforated through a plurality of steps and the non- woven fabric Nl may have the plurality of apertures 16.
  • a single roll of non-woven fabric Nl is repeatedly perforated with many apertures 16 through a plurality of steps. Accordingly, the size and apparent precision of the apertures 16 of the non- woven fabric N2 are improved and the perforation may be rapidly performed.
  • FIG. 5 shows an apparatus for and a method of perforating non- woven fabric according to a third embodiment.
  • the apparatus for perforating non-woven fabric according to the third embodiment includes a first roller 11 having a plurality of pins 15, and two or more opposing roller groups 20, 30, and 40.
  • Each of the opposing roller groups 20, 30, and 40 includes two or more second rollers 21, 22, 31, 32, 41, and 42.
  • the method of perforating a non- woven fabric according to the second embodiment includes a step of preparing one or more rolls of non- woven fabric Nl, a steps of passing the respective rolls of non- woven fabric Nl through gaps between the first roller and the respective opposing roller groups 20, 30, and 40 while each roll of the non- woven fabrics sequentially passes through gaps between the first roller 11 and the respective second rollers 21, 22, 31, 32, 41, and 42. Accordingly, the plurality of rolls of non- woven fabric Nl is perforated two or more times by the two or more second rollers 21, 22, 31, 32, 41 and 42 of the two or more opposing roller groups 20, 30, and 40, so that the non- woven fabric N2 having a plurality of apertures 16 is produced.
  • the first roller 11 and the second rollers 21, 22, 31, 32, 41, and 42, operating in relation with the first roller 11, rotate at low speed in the range from 1 to 50 m/min. Accordingly, it is possible to rapidly and accurately perforate non- woven fabric, and thus the productivity and cost efficiency of the perforated non- woven fabric are improved.
  • FIG. 6 shows the non- woven fabric N2 having a plurality of apertures 16, which is produced using the above-mentioned apparatus for and method of perforating non- woven fabric.
  • Peripherals of the perforated apertures 16 come to protrude by being pressed by the pins 15 of the first roller 11 and the second rollers 12, so that the cushiony property is imparted to the non- woven fabric N2.
  • the shapes of the apertures 16 and the peripherals of the perforated non-woven fabric vary according to the kind of non-woven fabric, the operation line speed, and the temperature of the first and second rollers.
  • the total area of the apertures 16 becomes 1 to 50% of the entire surface area of the perforated non- woven fabric N2, and the number of apertures 16 may be preferably 30/inch or more.
  • Perforated shape of FIG. 6. can changed to various shape by pin temerature, pin pressure, nonwoven type, nonwoven thickness and perforating line speed.
  • the perforated non- woven fabric produced by employing the above-mentioned apparatus for and method of perforating a non- woven fabric may be used in the state of being in direct contact with or attached to a part of a human body, used as a lining of a sanitary napkin or a diaper, as a cleaning cloth, or for the agricultural use.
  • a roll of bi-component spun-bond non- woven fabric which is a mixture of polypropylene and polyethylene (manufactured by Toraysaehan Co. Ltd.) of 20 g/m is sequentially perforated at the speed of 6 m/min two times, as shown in FIG. 5. At this time, the temperature of the first roller 11, and the temperature of the second rollers 21, 22, 31, and 32, which are rollers opposing the first roller 11, is 105 0 C.
  • Each of the second rollers has the same number of grooves as the number of pins.
  • the diameter of the pin is about 1.9 mm, and the number of pins is about 63/inch .
  • the embodiment 2 is the same as the embodiment 1.
  • the non- woven fabric in the first embodiment is used as a lining of a diaper.
  • the diameter is manufactured by Suan Industrial Co., Ltd.
  • the non- woven fabric in the first embodiment is used as a cleaning cloth for wiping a window of an automobile.
  • the non- woven fabric in the first embodiment is used in washing hands with soap.
  • each of two rolls of non- woven fabric is perforated at a speed of 6 m/min. Accordingly, the total operation speed is 12 m/min.
  • each of four rolls of non- woven fabric is perforated at 6 m/min, and four rolls of the non- woven fabric are simultaneously perforated.
  • the total operation speed is 24 m/min.
  • the perforated non-woven fabric has the same feeling as the appearance of a diaper.
  • feeling, hygroscopic property, and appearance are satisfactory to the customers.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention concerne un appareil et un procédé permettant de former facilement et rapidement plusieurs orifices dans la surface d'un tissu non tissé. L'appareil et le procédés sont économiquement satisfaisants. L'invention concerne également un tissu non tissé produit au moyen de cet appareil et du procédé. L'appareil de perforation du tissu non tissé comprend un premier rouleau pourvu de plusieurs broches sur sa surface conférentielle externe, et au moins deux seconds rouleaux qui tournent par rapport à la surface circonférentielle externe du premier rouleau et qui sont disposés sur la surface circonférentielle externe dans le sens de la circonférence.
PCT/KR2008/001885 2007-04-03 2008-04-03 Appareil et procédé de perforation d'une bande non tissée, bande non tissée obtenue par ce procédé WO2008120959A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880010240A CN101688344A (zh) 2007-04-03 2008-04-03 无纺布打孔设备及方法、通过其制造的无纺布
JP2010502023A JP2010523834A (ja) 2007-04-03 2008-04-03 不織布穿孔装置及びその方法、それから製造された不織布

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2007-0032717 2007-04-03
KR20070032717 2007-04-03
KR1020080031257A KR101004214B1 (ko) 2007-04-03 2008-04-03 부직포 천공장치 및 그 방법, 이에 의해 형성된 부직포
KR10-2008-0031257 2008-04-03

Publications (1)

Publication Number Publication Date
WO2008120959A1 true WO2008120959A1 (fr) 2008-10-09

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PCT/KR2008/001885 WO2008120959A1 (fr) 2007-04-03 2008-04-03 Appareil et procédé de perforation d'une bande non tissée, bande non tissée obtenue par ce procédé

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WO2010105009A1 (fr) * 2009-03-13 2010-09-16 The Procter & Gamble Company Procédé de fabrication d'une nappe bosselée
KR101004214B1 (ko) 2007-04-03 2010-12-24 심재헌 부직포 천공장치 및 그 방법, 이에 의해 형성된 부직포
WO2011017285A1 (fr) * 2009-08-03 2011-02-10 The Procter & Gamble Company Procédé de réalisation d’une toile en élastomère dotée d’ouvertures
US8206628B2 (en) 2009-03-13 2012-06-26 The Procter & Gamble Company Process for making an embossed web
US8557169B2 (en) 2010-03-11 2013-10-15 The Procter & Gamble Company Process for making an embossed web
US8585951B2 (en) 2009-03-13 2013-11-19 The Proctor & Gamble Company Process for making an embossed web
US8585958B2 (en) 2009-03-13 2013-11-19 The Procter & Gamble Company Process for making an embossed web
US8585667B2 (en) 2010-05-21 2013-11-19 The Procter & Gamble Company Insert with advantageous fastener configurations and end stiffness characteristics for two-piece wearable absorbent article
US8652115B2 (en) 2010-05-21 2014-02-18 The Procter & Gamble Company Insert with advantageous fastener configurations and end stiffness characteristics for two-piece wearable absorbent article
US8652114B2 (en) 2010-05-21 2014-02-18 The Procter & Gamble Company Insert with advantageous fastener configurations and end stiffness characteristics for two-piece wearable absorbent article
US8669409B2 (en) 2009-01-15 2014-03-11 The Procter & Gamble Company Reusable outer cover for an absorbent article
US8784395B2 (en) 2009-01-15 2014-07-22 The Procter & Gamble Company Two-piece wearable absorbent article
US8808263B2 (en) 2010-01-14 2014-08-19 The Procter & Gamble Company Article of commerce including two-piece wearable absorbent article
US8821470B2 (en) 2010-07-22 2014-09-02 The Procter & Gamble Company Two-piece wearable absorbent article with advantageous fastener performance configurations
US8926579B2 (en) 2013-03-08 2015-01-06 The Procter & Gamble Company Fastening zone configurations for outer covers of absorbent articles
US8926890B2 (en) 2009-03-13 2015-01-06 The Procter & Gamble Company Process for making an embossed web
US8932273B2 (en) 2012-06-29 2015-01-13 The Procter & Gamble Company Disposable absorbent insert for two-piece wearable absorbent article
US8936586B2 (en) 2013-03-08 2015-01-20 The Procter & Gamble Company Ergonomic grasping aids for reusable pull-on outer covers
US8974432B2 (en) 2010-07-22 2015-03-10 The Procter & Gamble Company Outer cover for an absorbent article
US8998870B2 (en) 2009-01-15 2015-04-07 The Procter & Gamble Company Reusable wearable absorbent articles with anchoring systems
US9060905B2 (en) 2013-03-08 2015-06-23 The Procter & Gamble Company Wearable absorbent articles
US9078792B2 (en) 2011-06-30 2015-07-14 The Procter & Gamble Company Two-piece wearable absorbent article having advantageous front waist region and landing zone configuration
US9078789B2 (en) 2013-03-08 2015-07-14 The Procter & Gamble Company Outer covers and disposable absorbent inserts for pants
US9089456B2 (en) 2009-01-15 2015-07-28 The Procter & Gamble Company Reusable outer cover for an absorbent article having zones of varying properties
US9095478B2 (en) 2010-07-22 2015-08-04 The Procter & Gamble Company Flexible reusable outer covers for disposable absorbent inserts
US9271879B2 (en) 2009-03-13 2016-03-01 The Procter & Gamble Company Article having a seal and process for forming the same
US9387138B2 (en) 2009-01-15 2016-07-12 The Procter & Gamble Company Reusable outer covers for wearable absorbent articles
US9724245B2 (en) 2011-04-26 2017-08-08 The Procter & Gamble Company Formed web comprising chads
US20210324554A1 (en) * 2020-04-16 2021-10-21 The Procter & Gamble Company Apertured Nonwoven

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KR101004214B1 (ko) 2007-04-03 2010-12-24 심재헌 부직포 천공장치 및 그 방법, 이에 의해 형성된 부직포
US9089456B2 (en) 2009-01-15 2015-07-28 The Procter & Gamble Company Reusable outer cover for an absorbent article having zones of varying properties
US8992497B2 (en) 2009-01-15 2015-03-31 The Procter & Gamble Company Two-piece wearable absorbent articles
US8998870B2 (en) 2009-01-15 2015-04-07 The Procter & Gamble Company Reusable wearable absorbent articles with anchoring systems
US9387138B2 (en) 2009-01-15 2016-07-12 The Procter & Gamble Company Reusable outer covers for wearable absorbent articles
US9011402B2 (en) 2009-01-15 2015-04-21 The Procter & Gamble Company Disposable absorbent insert for two-piece wearable absorbent article
US8784395B2 (en) 2009-01-15 2014-07-22 The Procter & Gamble Company Two-piece wearable absorbent article
US8669409B2 (en) 2009-01-15 2014-03-11 The Procter & Gamble Company Reusable outer cover for an absorbent article
US8206628B2 (en) 2009-03-13 2012-06-26 The Procter & Gamble Company Process for making an embossed web
US8968631B2 (en) 2009-03-13 2015-03-03 The Procter & Gamble Company Process for making an embossed web
US8613995B2 (en) 2009-03-13 2013-12-24 The Procter & Gamble Company Colored web material comprising a plurality of discrete extended elements
WO2010105009A1 (fr) * 2009-03-13 2010-09-16 The Procter & Gamble Company Procédé de fabrication d'une nappe bosselée
US9017592B2 (en) 2009-03-13 2015-04-28 The Procter & Gamble Company Process for making an embossed web
US8585951B2 (en) 2009-03-13 2013-11-19 The Proctor & Gamble Company Process for making an embossed web
US9271879B2 (en) 2009-03-13 2016-03-01 The Procter & Gamble Company Article having a seal and process for forming the same
US8585958B2 (en) 2009-03-13 2013-11-19 The Procter & Gamble Company Process for making an embossed web
US9012014B2 (en) 2009-03-13 2015-04-21 The Procter & Gamble Company Web material exhibiting viewing-angle dependent color and comprising a plurality of discrete extended elements
CN102348438A (zh) * 2009-03-13 2012-02-08 宝洁公司 用于制造压花纤维网的方法
US8926890B2 (en) 2009-03-13 2015-01-06 The Procter & Gamble Company Process for making an embossed web
US10543637B2 (en) 2009-03-13 2020-01-28 The Procter & Gamble Company Article having a seal and process for forming the same
US8986584B2 (en) 2009-03-13 2015-03-24 The Procter & Gamble Company Process for making an embossed web
US8940384B2 (en) 2009-03-13 2015-01-27 The Procter & Gamble Company Colored web material comprising a plurality of discrete extended elements
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