Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
  • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
  • D02G3/402—Yarns in which fibres are united by adhesives; Impregnated yarns or threads the adhesive being one component of the yarn, i.e. thermoplastic yarn
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S162/00—Paper making and fiber liberation
  • Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S57/00—Textiles: spinning, twisting, and twining
  • Y10S57/905—Bicomponent material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2915—Rod, strand, filament or fiber including textile, cloth or fabric
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
  • Y10T428/2931—Fibers or filaments nonconcentric [e.g., side-by-side or eccentric, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/2964—Artificial fiber or filament
  • Y10T428/2967—Synthetic resin or polymer
  • Y10T428/2969—Polyamide, polyimide or polyester
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2973—Particular cross section
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3065—Including strand which is of specific structural definition
  • Y10T442/313—Strand material formed of individual filaments having different chemical compositions
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3382—Including a free metal or alloy constituent
  • Y10T442/339—Metal or metal-coated strand

Definitions

• the present invention relates to new bonded threads made of high-strength material, which are suitable for the production of textile fabrics, which are used in hot-humid environments under hydrolyzing conditions, for example as technical filter fabrics, in particular as screen fabrics for paper machines.
• Polymers for example polyethylene terephthalate, which are subject to considerable degradation by hydrolysis under the conditions of use, are widely used to produce filter fabrics which can be used in hot-humid environments. In these applications, it has therefore proven to be essential to additionally equip the fabric and / or the yarns that make up the fabric in order to make hydrolytic degradation more difficult and thus increase the useful life of these fabrics.
• DE-Gbm-1,958,017 describes a sieve fabric made of polyester yarn, which was equipped with an acrylic resin before weaving.
• the aim is to cover the curable acrylic resin as completely as possible, and after curing, a tight coating is formed which is intended to prevent hydrolytic degradation of the yarn. Due to the manufacturing process, the acrylic resin only penetrates part of the thread, so that the main part is on the surface as a coating.
• DE-C-2,818,386 and DE-C-3,012,288 describe further multifilament yarns which can be used to manufacture such screen fabrics and which have been modified by impregnation with selected curable epoxy resin mixtures.
• multifilament yarns suitable for use in hot-humid environments be provided with a coating of thermoplastic material.
• DE-A-1,959,574 describes a thread which consists of a core thread and a plastic covering, this covering consisting of a thermoplastic resistant to mechanical stress. According to the description, the thread is characterized by high strength and good wear resistance.
• staple fiber yarns are known from DE-B-1,510,817, which have been coated and soaked with a thermoplastic. These yarns are characterized in that the fiber yarn is only twisted so tightly that its individual fibers can slide against one another during subsequent plastic stretching of the composite threads.
• the yarns described are notable for good plastic stretchability and have a strength lying between that of the plastic portion and the staple fiber portion.
• EP-B-52,268 describes a bundle of threads which is composed of at least three strands consisting of a plurality of threads and which are connected to one another with an informal plastic mass.
• An essential feature of this bundle of threads is considered that the plastic mass is located essentially inside the bundle of threads and is formed from a molten plastic bundle, that the bundle of threads is twisted as a whole and that the circumference of the bundle is determined solely by threads without any binding plastic mass is.
• a sewing thread which consists of a plurality of yarns twisted together by twisting, at least some of these yarns being made of a thermoplastic material which, based on the pattern produced by twisting, is on the surface of the sewing thread and is in a non-stick state before sewing. After sewing, the thermoplastic material is converted into a sticky state by heating and then connects the sewing thread to the material sewn together.
• V-belt which has been produced from a cord which, in addition to a main fiber component A, has up to 5% by weight, based on the total weight, of a fusible fiber component B which is melted by heating becomes.
• the V-belt is characterized by its high abrasion resistance.
• US-A-4 275 117 discloses bundles of threads in which higher and lower melting yarns are intertwined.
• the thread bundles produced have a largely smooth surface after the thermal treatment and are intended for use as tennis strings. No information is given about the tensile strength of the bundles of threads.
• US-A-3 494 819 describes textile fabrics made from yarns made from a higher melting component made from polyethylene terephthalate and a lower melting component made from polybutylene terephthalate.
• the fabrics are characterized by low pilling.
• the object of the present invention is to provide a high-strength multifilament yarn which is distinguished by a high flexural strength, is easy to produce and is particularly suitable for the production of textile fabrics such as sieves or filters which are to be used in a hot-humid environment.
• the invention relates to a bundle of threads for the production of screens or filters with a tensile strength of at least 38 cN / tex, preferably at least 42 cN / tex, made from at least two multifilament yarns twisted together from a first synthetic polymer and a second thermoplastic synthetic polymer, the Melting point is at least 10 ° C, preferably 15 to 50 ° C, below the melting or decomposition point of the first synthetic polymer, the individual filaments of the first synthetic polymer essentially over the entire twist cross section by melting the second thermoplastic synthetic polymer are connected.
• the multifilament yarn made of the first synthetic polymer can be made up of any meltable or non-meltable polymers, as long as it can be used to produce high-strength multifilament yarns with a tensile strength of at least 45 cN / tex, preferably more than 60 cN / tex.
• polymers examples include aramids, such as poly-p-phenylene-terephthalamide, poly-m-phenylene-isophthalamide or copolymers based on terephthalic acid and p-phenylenediamine and 3,4'-diaminodiphenyl ether, or based on terephthalic acid and p -Phenylene diamine, 4,4'-diaminobenzanilide and 5,5'-dimethylbenzidine, polyacrylonitrile, polyphenylene sulfide, aromatic polyesters such as poly-p-hydryoxbenzoate, polyamides such as nylon 6 or nylon 6,6, polyether ketones or in particular aliphatic polyesters such as polyethylene terephthalate or copolyethylene terephthalate containing, for example aliphatic or aromatic dicarboxylic acid components, such as isophthalic acid or adipic or sebacic acid, or aliphatic or aromatic diol component, such as butylene
• the yarn made of the second synthetic polymer does not necessarily have to be a multifilament yarn, but can also be constructed from staple fibers or represent a tear cable. However, a multifilament yarn is also preferably used here.
• the second polymer must be a fusible material, the melting point of which is so far below the melting or decomposition point of the first polymer that the multifilament yarn from the first polymer undergoes practically no loss of strength under the processing conditions. This will usually be the case if the melting point of the second polymer is at least 10 ° C below the melting or decomposition point of the first polymer.
• the second polymer is selected according to this criterion with regard to the first polymer.
• thermoplastic polymers which are suitable as a second yarn component are thermoplastic aramids, as described in EP-A-307,993 or in particular aliphatic Polyesters such as polyethylene terephthalate or polybutylene terephthalate.
• polyethylene terephthalate or a copolyethylene terephthalate is used as the first yarn component
• polybutylene terephthalate is preferably used as the second yarn component.
• the melting of the second yarn component is to be designed in such a way that the yarn forming this component is distributed essentially over the entire twisted cross section and the individual filaments of the first yarn component are evenly connected by melting.
• the thread is heated under tension, as described below.
• the titer of the multifilament yarns of the first polymer component that compose the thread bundle according to the invention is usually 550 to 2200 dtex, preferably 1050 to 1150 dtex.
• the titer of the yarns of the second polymer component making up the bundle of threads according to the invention is usually 250 to 1100 dtex, preferably 500 to 600 dtex.
• the bundle of threads according to the invention is characterized by a high maximum tensile force; this amounts approximately to the maximum tensile force of the multifilament yarns of the first polymer component that build up the thread bundle according to the invention.
• the proportion of the second polymer is usually less than 60% by weight, preferably 20 to 50% by weight, based on the total weight of the Bundle of threads.
• the thread bundle according to the invention particularly preferably has a rectangular cross section, which in particular has rounded corners. Threads with such cross sections are particularly suitable for the production of filter fabrics for paper machines. Threads with these cross-sectional shapes are described in US-A-4,290,209. described.
• the thread bundles according to the invention can be constructed from one or more high-strength multifilament yarns. Multifilaments made of the same or different types of polymer can be used. This also applies to yarns made from the second polymer.
• the bundles of threads according to the invention preferably consist of two multifilament yarns twisted together.
• the polymers used preferably belong to the same type of polymer, e.g. Polyester / polyester.
• the twisting of the yarn components can take place on all suitable devices, for example on multi-tier twisting machines, ring twisting machines or double-wire twisting machines.
• the tension to be used in step ii) is selected such that the stretch desired for the area of use is set.
• yarn tensions of 0.15 to 0.25 cN / dtex are sufficient for this step.
• the fabric bundle according to the invention can be used to produce textile fabrics which are particularly suitable for use in a hot and humid environment.
• the invention therefore also relates to these fabrics and their use.
• Such textile fabrics can be produced using all known area-forming technologies, in which thread bundles can be processed with a relatively high bending stiffness. Examples of this are knitted fabrics, scrims, knitted fabrics or, in particular, woven fabrics. Of the fabrics, those with a plain weave are particularly preferred.
• the textile fabrics according to the invention can be used in particular as filter material in hot-humid environments, such as for the filtration of hot liquids or hot, moisture-containing gases, in particular as screen cloth for paper machines.
• This thread is then fixed at 235 ° C under a tension of 750 cN and a dwell time of 60 seconds on a drawing machine.
• a 40-hour hydrolysis test is then carried out in an autoclave at 135 ° C.
• the tensile strength of the thread is still 47% of the initial value.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Switch Cases, Indication, And Locking (AREA)
• Brushes (AREA)
• Adornments (AREA)
• Paper (AREA)
• Woven Fabrics (AREA)
• Filtering Materials (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6449533

Family Applications (1)

Country Status (7)

Families Citing this family (13)

Family Cites Families (13)

• 1993
  • 1993-01-07 EP EP93100149A patent/EP0551832B1/de not_active Expired - Lifetime
  • 1993-01-07 AT AT93100149T patent/ATE153087T1/de not_active IP Right Cessation
  • 1993-01-07 DE DE59306421T patent/DE59306421D1/de not_active Expired - Fee Related
  • 1993-01-13 US US08/003,798 patent/US5366797A/en not_active Expired - Lifetime
  • 1993-01-13 JP JP5003947A patent/JPH05272020A/ja active Pending
  • 1993-01-13 FI FI930130A patent/FI930130A/fi not_active Application Discontinuation
  • 1993-01-14 MX MX9300181A patent/MX9300181A/es unknown

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