EP0132563B1 - Utilisation de bandelettes étirées uniaxialement, en polypropylène ou copolymères de propylène-éthylène pour la fabrication de tissus ou tricots - Google Patents

Utilisation de bandelettes étirées uniaxialement, en polypropylène ou copolymères de propylène-éthylène pour la fabrication de tissus ou tricots Download PDF

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Publication number
EP0132563B1
EP0132563B1 EP84106599A EP84106599A EP0132563B1 EP 0132563 B1 EP0132563 B1 EP 0132563B1 EP 84106599 A EP84106599 A EP 84106599A EP 84106599 A EP84106599 A EP 84106599A EP 0132563 B1 EP0132563 B1 EP 0132563B1
Authority
EP
European Patent Office
Prior art keywords
tapes
polypropylene
layer
ethylene
knitted fabrics
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
Application number
EP84106599A
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German (de)
English (en)
Other versions
EP0132563A1 (fr
Inventor
Peter Dipl.-Ing. Reither
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.)
PCD Polymere GmbH
Original Assignee
PCD Polymere GmbH
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 PCD Polymere GmbH filed Critical PCD Polymere GmbH
Priority to AT84106599T priority Critical patent/ATE27622T1/de
Publication of EP0132563A1 publication Critical patent/EP0132563A1/fr
Application granted granted Critical
Publication of EP0132563B1 publication Critical patent/EP0132563B1/fr
Expired legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to the use of monoaxially stretched ribbons made of polypropylene or propylene-ethylene copolymers, which have a significantly lower tendency to splice than the previously known ribbons, for the production of flexible fabrics or knitted fabrics in which the ribbons are movable with one another.
  • Flexible woven or knitted fabrics made of monoaxially stretched tapes made of thermoplastic materials are being used increasingly in various fields of application, such as, for. B. Production of weaving, fabrics and use as geotextile and much more.
  • Loose ribbon fabrics or knitted fabrics can serve, for example, as so-called Raschel fabrics for the storage of perishable piece goods, in particular fruits and vegetables.
  • ribbons made of polypropylene are particularly suitable because of their good concealability and the high strength that can be achieved for them, but the disadvantage is the particularly pronounced tendency to splice of polypropylene structures which are stretched monoaxially because they are used to unravel the ribbon and to disrupt processing machines, e.g. . B. the looms leads, which occurs particularly disturbing where the ribbons are twisted during the weaving process, since there is a particularly high risk of splice.
  • a multilayer and stretched packaging film which consists of a polypropylene layer which is covered by a polyethylene or ethylene-vinyl acetate copolymer layer.
  • this film should only have a satisfactory transverse strength if the volume fraction of the polypropylene layer is not more than 20%.
  • biaxially stretched polypropylene films are known which are coated on at least one side with a film-forming polymer containing at least 65% by weight of ethylene (AT-A-264144).
  • EP-B-2606 describes weldable, biaxially stretched polypropylene films which are provided with an LLDPE layer (linear low density polyethylene) which makes up 2-10% of the total thickness of the film. It has also been proposed to obtain a rough surface film by coextruding, laminating and stretching two films, adding less of that of the two layers forming the surface layer and tearing when the laminated film is stretched (AT -A-368439) ..
  • an air-permeable composite material has been proposed by using monoaxially stretched tapes made of a first plastic, for example made of HDPE (high density polyethylene) or polypropylene, on one or both sides with a second plastic with a lower melting temperature are coated in a fabric or fleece-like manner in at least two layers running at an angle to one another in such a way that the low-melting cover layers come to lie on one another, whereupon these layers are welded to one another by the action of heat and pressure.
  • the base layer can include made of polypropylene, the top layer made of LDPE (low density polyethylene).
  • DE-A-1704429 also describes the production of welded ribbon fabrics from multilayer film tapes, in which the outer layers, which have a lower melting point, are welded, while the core layer, e.g. is made of polyester or polyamide, remains unaffected.
  • US-A-3187982 discloses band-like films or tubes made of monoaxially oriented, crystalline polyolefins, one surface of which is covered by a layer of a thermoplastic material which has a substantially lower melting point. These films are particularly suitable as tear tapes for packs made of thermoplastic materials. These tapes, which have been stretched at least 1: 7, are produced by coextrusion using the blown film process, the orientable layer usually representing the inner layer and subsequent stretching at a temperature at which the crystalline plastic is in the stretching region, but the plastic in the coating is in the molten state.
  • This tape material is specifically described as high-density polyethylene as an orientable plastic and low-density polyethylene as a coating polymer, with a tape material after stretching rial arises in which both layers each have a thickness of 190 [tm.
  • FR-A 2204726 describes a rigid fabric in which warp and weft threads consist of tapes which are produced from a film consisting of layers of low-density polyethylene (LDPE) and polyolefins, in particular high-density polyethylene or polypropylene, where the layer of low density polyethylene is on one of the surfaces.
  • LDPE low-density polyethylene
  • polyolefins in particular high-density polyethylene or polypropylene
  • a likewise rigid fabric made of thermoplastic materials is described in DE-A-2127167.
  • the strips woven into it have a surface layer made of thermoplastic material, the melting temperature of which is lower than that of the base plastic.
  • the present invention accordingly relates to the use of monoaxially stretched tapes made of polypropylene or propylene-ethylene copolymers with an ethylene content of at most 30% by weight, which on the surface is composed of low-density polyethylene, which is up to 10% by weight higher alpha-olefins may contain polymerized or are covered from a copolymer of ethylene with vinyl acetate, the ribbons on one side being covered with the polyethylene layer in a thickness such that the base layer of the propylene polymer in the ribbon makes up at least 70% by volume for the production of flexible, not splicing fabrics or knitted fabrics in which the ribbons are movable among themselves.
  • Polypropylene is primarily used for those types that are usually used for the production of ribbons. Depending on the intended use, it contains smaller or higher amounts of the usual processing stabilizers, antioxidants such as sterically hindered phenols and possibly also UV stabilizers.
  • the propylene polymer can furthermore contain a mineral filler, in particular one such as talc, which has already been proposed to reduce the tendency to splice, and / or one or more inorganic pigments.
  • a propellant can be added to the propylene polymer during production, which causes the polypropylene base layer to expand when extruded.
  • the polymer used for the coating is low-density polyethylene, for example one below 0.94 g / cm 3 (LDPE), as is obtained by the so-called high-pressure process.
  • ethylene copolymers with small amounts of polymerized alpha-olefins, the so-called LLDPE can also be used.
  • Ethylene-vinyl acetate copolymers are also suitable, expediently those with a vinyl acetate content of less than 20% by weight.
  • the tapes used according to the invention are produced by coextrusion using the processes known per se, such as blown film processes or processes with a slot die, the use of a slot die being preferred. Both a chill-roll process and a process with direct water bath cooling can be used here.
  • the film produced in this way is then cut into ribbons, and the ribbons are then stretched, for example using a hot air duct, degrees of stretching being possible from 4 to about 12 times.
  • stretching in the short gap can also be used, but is not necessary in order to suppress the tendency to splice.
  • the reverse procedure is also possible, namely stretching the film and then cutting into strips in the stretching direction.
  • the measure of the low tendency to splice of the tapes used according to the invention is the determination of the tear propagation resistance, which is carried out in accordance with DIN 53859. With this determination, a tear strength of 30 to 60 cN / mm is determined for polypropylene, which is caused by modification of polypropylene can be increased to about 50 to 80 cN / mm by the additives mentioned according to the prior art.
  • the tapes used according to the invention on the other hand, have a tear strength of about 250 cN / mm and also higher, which is more than 3 times the tapes that were previously considered to be low-splicing.
  • a co-extruded two-layer film was produced via a two-layer blown film head, a polypropylene homopolymer with a melt index (230 / 2.16) of 2.5 g / 1 Omin for the base layer and a low-density polyethylene (LDPE) with a melt index for the cover layer (190 / 2.16) of 0.8 g / 10 min and a density (23 ° C.) of 0.923 g / cm 3 , which was equipped with a lubricant, was used.
  • LDPE low-density polyethylene
  • the extrudate was cooled using conventional air cooling.
  • the primary film obtained had a thickness of 0.115 mm, the thickness of the polypropylene layer being 0.095 mm and that of the LDPE layer 0.02 mm.
  • This primary film was cut into strips with a width of 8.8 mm and stretched in a stretching furnace heated by hot air at a temperature of 145 ° C. and a stretching ratio of 1: 8.2. Subsequent to the stretching process, these tapes were subjected to a heat treatment at 130 ° C., a shrinkage of about 5% being permitted.
  • the tapes thus obtained then had a thickness of 0.047 mm, the polypropylene layer being 0.037 mm thick (78% by volume). The polyethylene layer was therefore 0.01 mm thick.
  • the tapes coated according to the invention thus had about 4 times the tear strength than those which were coextruded only from polypropylene.
  • Example 2 The same polypropylene as in Example 1 and a linear low density polyethylene (so-called LLDPE) with a melt index (190 / 2.16) of 1.0 g / 10 min and a density (23 ° C.) of 0.920 g / cm 3 were used As described in Example 1, a primary film with a thickness of 0.105 mm was produced, the polypropylene layer being 0.085 mm. After cutting and drawing under the same conditions as in Example 1, tapes 0.042 mm thick were obtained. The polypropylene layer was 0.032 mm thick, that is 76 vol.%, The LLDPE layer had a thickness of 0.01 mm.
  • LLDPE linear low density polyethylene

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)
  • Artificial Filaments (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Claims (6)

1. Utilisation de petits rubans ou cordonnets à étirage monoaxial, constitués par des copolymères polypropylène-éthylène d'une proportion d'éthylène de 30% en poids au maximum, qui sont recouverts à leur surface par du polyéthylène de faible densité qui peut renfermer jusqu'à 10% en poids d'alpha-oléfines supérieures incorporées par copolymérisation ou un copolymère de l'éthylène avec l'acétate de vinyle, les petits rubans étant recouverts sur une face, la couche de polyéthylène a une épaisseur telle que la couche de base constituée par le polymère de propylène représente au moins 70% en volume dans le petit ruban; pour produire des tissus ou tricots (tissus à mailles) flexibles, dépourvus de fibrillation, dans lesquels les petits rubans sont mutuellement mobiles.
2. Utilisation suivant la revendication 1, caractérisée en ce que la couche de base de polymères de propylène représente au moins 75% en volume dans le petit ruban.
3. Utilisation suivant les revendications 1 e 2, caractérisée en ce que la couche de base de polymère de propylène renferme une charge minérale et/ou un pigment.
4. Utilisation suivant les revendications 1 à 3, caractérisée en ce que la couche de base est obtenue à partir de polymère de propylène par soufflage au moyen d'un agent soufflant.
5. Utilisation suivant les revendications 1 à 4, caractérisée en ce que les petits rubans présentent une épaisseur totale inférieure à 150 pm.
6. Utilisation suivant la revendication 5, caractérisée en ce que les petits rubans ont une épaisseur totale de 25 à 60µm.
EP84106599A 1983-06-27 1984-06-08 Utilisation de bandelettes étirées uniaxialement, en polypropylène ou copolymères de propylène-éthylène pour la fabrication de tissus ou tricots Expired EP0132563B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84106599T ATE27622T1 (de) 1983-06-27 1984-06-08 Verwendung von monoaxial verstreckten baendchen aus polypropylen oder propylen-aethylencopolymeren zur herstellung von geweben oder gewirken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3323109 1983-06-27
DE19833323109 DE3323109A1 (de) 1983-06-27 1983-06-27 Monoaxial verstreckte baendchen aus polypropylen oder propylen-aethylen-copolymeren

Publications (2)

Publication Number Publication Date
EP0132563A1 EP0132563A1 (fr) 1985-02-13
EP0132563B1 true EP0132563B1 (fr) 1987-06-03

Family

ID=6202504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106599A Expired EP0132563B1 (fr) 1983-06-27 1984-06-08 Utilisation de bandelettes étirées uniaxialement, en polypropylène ou copolymères de propylène-éthylène pour la fabrication de tissus ou tricots

Country Status (4)

Country Link
EP (1) EP0132563B1 (fr)
AT (1) ATE27622T1 (fr)
DE (2) DE3323109A1 (fr)
DK (1) DK310584A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4814131A (en) * 1987-07-02 1989-03-21 Atlas Sheldon M Process for producing a shaped article, such as fiber composed of a hydrophobic polymer and a hydrophilic polymer
DE19513808C2 (de) * 1995-04-12 1998-05-28 Natura Verpackungs Gmbh Verfahren zur Herstellung von Web- oder Wirkbahnen zur Fertigung biologisch abbaubarer Säcke, Beutel, Netze oder dgl.

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1174772A (en) * 1966-06-10 1969-12-17 P P Payne & Sons Ltd Improvements in or relating to Tapes and Ribbons
US3505164A (en) * 1967-06-23 1970-04-07 Hercules Inc Self-bulking conjugate filaments
DE1704429A1 (de) * 1967-07-05 1972-02-17 Lissmann Alkor Werk Verfahren zur Herstellung eines textilbewehrten Werkstoffs auf Kunststoffbasis
JPS5235776B1 (fr) * 1969-01-31 1977-09-10
GB1348247A (en) * 1970-06-02 1974-03-13 Shell Int Research Coated fabrics of thermoplastics materials
JPS4840870A (fr) * 1971-09-25 1973-06-15
CA995100A (en) * 1972-10-26 1976-08-17 Du Pont Of Canada Limited Manufacture of stabilized woven structures
DE2314052B2 (de) * 1973-03-21 1978-11-16 Veba-Chemie Ag, 4660 Gelsenkirchen- Buer Monoaxial gereckte spleififreie Packbänder aus Polyolefinen
NZ185412A (en) * 1976-10-20 1980-03-05 Chisso Corp Heat-adhesive compsite fibres based on propylene
GB1590838A (en) * 1978-04-28 1981-06-10 Courtaulds Ltd Woven fabric
DE8025884U1 (de) * 1980-09-27 1982-04-01 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Gewebebahn, insbesondere teppichgrundgewebebahn
AT369440B (de) * 1981-06-01 1982-12-27 Chemiefaser Lenzing Ag Verfahren zur herstellung von folienbaendchen

Also Published As

Publication number Publication date
ATE27622T1 (de) 1987-06-15
EP0132563A1 (fr) 1985-02-13
DE3464068D1 (en) 1987-07-09
DK310584A (da) 1984-12-28
DK310584D0 (da) 1984-06-26
DE3323109A1 (de) 1985-01-03

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