EP1010792B1 - Elastische schlauchförmige Strickware und Verfahren zu deren Erhaltung - Google Patents

Elastische schlauchförmige Strickware und Verfahren zu deren Erhaltung Download PDF

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Publication number
EP1010792B1
EP1010792B1 EP99500044A EP99500044A EP1010792B1 EP 1010792 B1 EP1010792 B1 EP 1010792B1 EP 99500044 A EP99500044 A EP 99500044A EP 99500044 A EP99500044 A EP 99500044A EP 1010792 B1 EP1010792 B1 EP 1010792B1
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EP
European Patent Office
Prior art keywords
ribbons
loops
chains
fabric
film
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.)
Expired - Lifetime
Application number
EP99500044A
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English (en)
French (fr)
Other versions
EP1010792A2 (de
EP1010792A3 (de
Inventor
Ezequiel Giro Amigo
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.)
GIMAR, S.L.
Original Assignee
Gimar SL
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Filing date
Publication date
Application filed by Gimar SL filed Critical Gimar SL
Publication of EP1010792A2 publication Critical patent/EP1010792A2/de
Publication of EP1010792A3 publication Critical patent/EP1010792A3/de
Application granted granted Critical
Publication of EP1010792B1 publication Critical patent/EP1010792B1/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
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/10—Open-work fabrics
    • D04B21/12—Open-work fabrics characterised by thread material
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/061—Load-responsive characteristics elastic
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/10—Packaging, e.g. bags

Definitions

  • Plastic or paper bags, Raschel fabric sacks and either knitted or extruded tubular net bags have heretofore been used in order for such fruit and vegetable products as citrus fruits, potatoes, onions and the like to be packed.
  • Tubular net has become the most widely used material for bags weighing up to five kilograms.
  • Knitted tubular net has a number of advantages over extruded tubular net, such as offering a better ratio between strength and weight of the net, less quantity and volume of plastic material per bag, lowering the cost of recycling, greater flexibility which allows a greater length to be loaded on the tube of the packing machine, less thickness and rigidity which makes it more suitable for frail products, and allowing a wide range of openwork shapes to be provided, such as diamonds, hexagons, rectangles, etc., whereas extruded net may only have a diamond-shaped openwork.
  • US-A-4 060 999 discloses a method for forming yarn elements which may be used for the production of knitted bags having minimum stretch characteristics and which are particularly adapted for encasing and supporting food.
  • the method involves the slitting of a web of thermoplastic material, such as polypropylene film, into strips of predetermined width and thereafter stretching each strip under controlled conditions of heat and force application.
  • a relatively flat yarn element is obtained which is capable of being directed into a textile machine, such as a knitting machine, to form a desired product, e. g. a tubular knit structure.
  • US-A-5 104 714 relates to a plastic knitted netting which may be used for wrapping heavy loads, e. g. loads on pallets or agricultural loads such as bales of hay.
  • This document further discloses a method of making thermoplastic ribbons which are used to knit this netting, e.g. by employing Raschel knitting machines.
  • These ribbons consist essentially of linear low density polyethylene which are oriented and have a ratio of stretched oriented length to original substantially unoriented length of between 1:4 and 1:5. More specifically, this prior art document refers to a knitted netting comprising longitudinal and lateral ribbons having a thickness of 0.04 to 0.05 mm and 0.02 to 0.03 mm, respectively.
  • Linear low density polyethylene which has been copolymerized with the alpha olefin, octene, is the preferred thermoplastic material.
  • this prior art document does not refer to the production of tubular knitted fabrics.
  • the object of the present Patent application is an elastic tubular knitted fabric and a process for obtaining the same which, in addition to the function for which it was designed, contributes a number of advantages that shall be set out hereinafter, besides others inherent in the arrangement and construction thereof.
  • the invention lies in an elastic tubular knitted fabric made of thermoplastic polymer and a method for making the same in order to obtain a net that is both elastic and has an ultimate elongation such as to combine the compression and adaptability of the extruded net perfectly with the advantages of a flexible and scarcely rigid conventional knitted net. Furthermore, due to the characteristics of the thermoplastic with which it is made, the inventive net greatly improves such properties as the flexibility and scarce rigidity of a conventional knitted net.
  • the tubular net of the invention is especially suited for packing products in line, such as garlic, onions, etc., or when the net is required to adapt to the shape of the product contained, for the extent of compression exerted on the packed product may be varied at will due to its elasticity. It is moreover especially suitable for packing frail products, being as it is that there is an almost negligible chance of damaging the packed product due to its great flexibility, not heretofore achieved by any net.
  • the elastic tubular net subject of the invention can be used in any of the packing machines existing in the market, be they manual, semiautomatic or automatic, without a seal, with a staple or weld seal.
  • an elastic tubular knitted fabric said fabric being formed of ribbons made of thermoplastic material, said ribbons being produced by extrusion of an elastic film of said thermoplastic material, and cutting and stretching this film.
  • the elastic tubular knitted fabric of the present invention is obtained by means of a process comprising making an elastic film, essentially made of a thermoplastic polymer, a pigmentary dispersion and a lubricating agent, obtained in an extrusion process with certain dimensional ratios between the opening for the outlet of material, in the extruder head, and the sheet of film; cutting and stretching the film in certain conditions as to stretch and temperature ratio; and knitting the resultant ribbons with a preferred loop structure so that the tubular fabric has an ultimate elongation and an elastic limit respectively in excess of 100% and 20%.
  • thermoplastic polymer is an ethyleneoctene copolymer
  • the pigmentary dispersion is a pigment dispersion devoid of such extenders as titanium dioxide in low density polyethylene
  • the lubricating agent is a fatty amide lubricant.
  • the dimensional ratios between the opening for the outlet of material, in the extruder head, and the sheet of film consist of a value of approximately 17 for the ratio between the thickness of the opening for the outlet of material and the thickness of the film, and a value of approximately 0.7 for the ratio between the perimeter for the outlet of material and the width of the sheet of film.
  • Said film is cut and stretched to form ribbons suitable to be knitted, with a stretch ratio of less than 1:4 and a temperature not in excess of 50 degrees centigrade.
  • the resultant ribbons are all knitted forming a tubular loop structure, with chains of loops running parallel to the longitudinal axis of the tubular fabric, and ribbons perpendicular to said axis interconnecting the chains of loops.
  • the chains of loops running parallel to the longitudinal axis are formed by two types of ribbons, one type being knitted only into said chains, and others which are perpendicular to the longitudinal axis and interconnect the chains of loops, preferably in a sequence of one loop consisting of one type of ribbon and the adjacent loop consisting of the other type of ribbon. Both types of ribbons can have different dimensions and their use in the loop structure may be unequal.
  • the fabric has an ultimate elongation in excess of 100% and an elastic limit in excess of 20%, and a tensile strain recovery in excess of 25% when stretched beyond 40%; the loop structure being preferably one in which the ribbons forming the structure are cut and stretched in certain conditions as to stretch and temperature ratio.
  • An outstanding property of the inventive tubular knitted fabric is that a high elasticity and ultimate elongation are successfully achieved, the tensile strength of the net being in excess of 6.5 kg of strength per gram of weight of the linear metre, which renders the net suitable as concerns its strength to make the most usual bags, i.e. weighing up to 4 kg.
  • tubular knitted fabric of the invention The following are the most outstanding physical characteristics of the tubular knitted fabric of the invention, compared with those of standard tubular knitted fabrics made with high density polyethylene (HDPE).
  • Inventive Fabric Standard Fabric (HDPE) Ultimate elongation 160% 20% Elastic limit 30% Negligible Relative elongation 3.2 %/kg 0.3 %/kg
  • the ultimate elongation is the deformation the net suffers, as a percentage of the initial length, when it is applied sufficient tensile stress to be broken.
  • the elastic limit is the percentage elongation, with reference to the initial length, which the net may suffer when it is applied a tensile stress, so as to retrieve its initial length when said stress stops acting.
  • Relative elongation is the deformation the net suffers, as a percentage over the initial length, for every kilogram of tensile stress exerted.
  • Tensile strength is the maximum tensile stress the net can stand until it breaks divided by the weight in grams of a linear metre.
  • Figure 1 Is a partial perspective view of an elastic tubular knitted fabric obtained by means of the process according to the invention.
  • the same shows a preferred embodiment, which does not however limit the invention, consisting of an elastic tubular knitted fabric made with the process described above, wherein the resultant ribbons are knitted so as to form a tubular loop structure as shown in figure 1, and may be seen therein to have chains of loops -1- running parallel to the longitudinal axis -5- of the fabric, and ribbons -2-perpendicular to said axis -5- and parallel to the cross axis -6- of the fabric, interconnecting the chains of loops.
  • the chains of loops -1- running parallel to the longitudinal axis also comprise two types of ribbons, some -3- knitted only into said chains and others -4- perpendicular to the longitudinal axis, interconnecting the chains of loops -1- in a sequence of one loop comprising one type of ribbon, whereas the adjacent loop is made of the other type of ribbon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Knitting Of Fabric (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Prostheses (AREA)

Claims (9)

  1. Elastische schlauchförmige Strickware, wobei die Strickware aus Bändern aus thermoplastischem Material gebildet ist und wobei diese Bänder durch Extrusion einer elastischen Folie aus besagtem thermoplastischen Material und durch Schneiden und Recken dieser Folie hergestellt wird, dadurch gekennzeichnet, dass
    die Bänder aus der elastischen Folie gestrickt sind, welche im Wesentlichen aus einem Ethylen-Octen-Copolymer, einer Pigmentdispersion und einem Gleitmittel hergestellt ist, so dass eine schlauchförmige Maschenstruktur gebildet wird, welche Ketten aus Maschen (1) aufweist, die parallel zur Längsachse (5) der Schlauchstrickware verlaufen, sowie Bänder (2), die senkrecht zu dieser Achse verlaufen und die besagten Ketten aus Maschen (1) miteinander verbinden, wobei die längsverlaufenden Maschenketten (1) aus zwei Arten von Bändern gebildet sind, nämlich einer Art (3), die nur in die besagten längsverlaufenden Ketten (1) eingestrickt ist, und einer Art von Bändern (4), welche die besagten längsverlaufenden Maschenketten (1) miteinander verbinden, und
    die besagte Strickware eine Dehnungsgrenze von über 100 % und eine Elastizitätsgrenze von über 20 % aufweist.
  2. Eine elastische schlauchförmige Strickware nach Anspruch 1, dadurch gekennzeichnet, dass die Pigmentdispersion eine Pigmentdispersion ist, welche keine Verschnittmittel, wie z.B. Titandioxid, enthält, und das Gleitmittel aus der Gruppe der Fettamide ausgewählt ist.
  3. Eine elastische schlauchförmige Strickware nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Bänder (3, 4) aus einer elastischen Folie gebildet sind, die in einem Reckverhältnis von weniger als 1:4 und bei einer Temperatur von nicht über 50 °C gereckt ist.
  4. Eine elastische schlauchförmige Strickware nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass die Maschen der Maschenketten (1) in abwechselnder Reihenfolge angeordnet sind, wobei eine Masche aus dem einen Bandtyp (3) und die jeweils benachbarte Masche aus dem anderen Bandtyp (4) besteht.
  5. Elastische schlauchförmige Strickware nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass sie eine Zugbeanspruchungsrückverformung von mehr als 25 % aufweist, wenn sie über 40 % hinaus gedehnt wird.
  6. Verfahren zur Herstellung einer elastischen schlauchförmigen Strickware, wobei die Strickware aus Bändern aus thermoplastischem Material hergestellt wird und das Verfahren die Schritte der Herstellung einer elastischen Folie dieses Materials unter Verwendung eines Extrusionsverfahrens und des Schneidens und Reckens der Folie, um Bänder herzustellen, umfasst, dadurch gekennzeichnet, dass
    die elastische Folie im wesentlichen aus einem Ethylen-Octen-Copolymer, einer Pigmentdispersion und einem Gleitmittel besteht, und
    das Größenverhältnis zwischen der Dicke der Austrittsöffnung des Extruderkopfes und der Dicke der extrudierten Folie ungefähr 17 beträgt, und dass das Größenverhältnis zwischen dem Umfang der Austrittsöffnung und der Breite der Folienbahn ungefähr 0,7 beträgt und
    die Bänder gestrickt werden, um eine schlauchförmige Maschenstruktur zu bilden, mit Maschenketten (1), die parallel zur Längsachse (5) der schlauchförmigen Strickware verlaufen, und Bändern (2), die senkrecht zu dieser Achse verlaufen und welche die Maschenketten (1) miteinander verbinden, wobei die besagten längsverlaufenden Maschenketten (1) aus zwei Arten von Bändern gebildet sind, von denen eine Art nur in die besagten längsverlaufenen Maschenketten (1) eingestrickt wird und eine andere Art von Bändern (2) die längsverlaufenden Ketten (1) miteinander verbindet.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Pigmentdispersion eine Pigmentdispersion ist, welche keine Verschnittmittel, wie z.B. Titandioxid, enthält, und dass das Gleitmittel aus der Gruppe der Fettamide ausgewählt ist.
  8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Folie geschnitten und mit einem Reckverhältnis von weniger als 1:4 und bei einer Temperatur von nicht über 50 °C gereckt wird.
  9. Verfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die schlauchförmige Ware derart gestrickt wird, dass die Maschen der besagten Maschenketten (1) in abwechselnder Reihenfolge angeordnet sind, wobei eine Masche aus der einen Bandart (3) und die jeweils benachbarte Masche aus der anderen Bandart (4) besteht.
EP99500044A 1998-12-15 1999-03-17 Elastische schlauchförmige Strickware und Verfahren zu deren Erhaltung Expired - Lifetime EP1010792B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES009802596A ES2154197B1 (es) 1998-12-15 1998-12-15 Tejido de punto tubular elastico y procedimiento para su obtencion.
ES9802596 1998-12-15

Publications (3)

Publication Number Publication Date
EP1010792A2 EP1010792A2 (de) 2000-06-21
EP1010792A3 EP1010792A3 (de) 2001-02-07
EP1010792B1 true EP1010792B1 (de) 2003-09-03

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EP99500044A Expired - Lifetime EP1010792B1 (de) 1998-12-15 1999-03-17 Elastische schlauchförmige Strickware und Verfahren zu deren Erhaltung

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EP (1) EP1010792B1 (de)
AT (1) ATE248942T1 (de)
DE (1) DE69910959T2 (de)
ES (1) ES2154197B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1736583A1 (de) * 2005-06-20 2006-12-27 Giro GH S.A. Maschennetz für Taschen oder Verpackungen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2277689B1 (es) * 2002-09-23 2008-07-01 Giro Gh, S.A. Procedimiento y red para impedir la penetracion del hormigon en los orificios de piezas huecas para la construccion.
ES2718119B2 (es) * 2017-12-27 2022-01-11 Badalona Pac S L Metodo de fabricacion de una malla tejida tubular bi-elastica y malla tubular resultante

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645299A (en) * 1966-10-25 1972-02-29 Chemiefaser Lenzing Ag Process for the production of foil ribbon fabrics and apparatus for carrying out this process
US4060999A (en) * 1974-11-05 1977-12-06 Enterprise Incorporated Method and apparatus for forming yarn elements and producing products therefrom
US4402409A (en) * 1981-11-12 1983-09-06 Conwed Corporation Remarkable superior plastic netting for use in palletized loads
US5104714A (en) * 1989-11-30 1992-04-14 Tama Plastic Industry Elastic plastic netting made of oriented strands
US5664306A (en) * 1992-07-09 1997-09-09 Tama Plastic Industry Apparatus and method for producing colored knitted net

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1736583A1 (de) * 2005-06-20 2006-12-27 Giro GH S.A. Maschennetz für Taschen oder Verpackungen
US7269978B2 (en) 2005-06-20 2007-09-18 Giro Gh, S.A. Mesh for bags or packaging

Also Published As

Publication number Publication date
DE69910959T2 (de) 2004-06-09
DE69910959D1 (de) 2003-10-09
ATE248942T1 (de) 2003-09-15
ES2154197B1 (es) 2001-09-01
EP1010792A2 (de) 2000-06-21
ES2154197A1 (es) 2001-03-16
EP1010792A3 (de) 2001-02-07

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