Classifications

• • 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
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/009—Condensation or reaction polymers
  • D04H3/011—Polyesters
• • 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
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
  • D04H3/147—Composite yarns or filaments
• • 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
  • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
  • D04H5/04—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by applying or incorporating chemical or thermo-activatable bonding agents in solid or liquid form
• • 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
  • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
  • D04H5/06—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by welding-together thermoplastic fibres, filaments, or yarns

Definitions

• the present invention relates to a filament-reinforced polyester nonwoven web, which is particularly suitable as an insert for bitumen membranes and roofing membranes.
• filament-reinforced nonwoven web denotes nonwoven webs in which linear fiber structures such as e.g. Filament bundles, monofilaments, yarns from stacks or continuous fibers, running essentially parallel and in a straight line, embedded or otherwise positively connected.
• Filament-reinforced nonwoven webs which are reinforced by parallel filaments in the manner of a warp thread group, are known from DE-A-22 38 394.
• This publication preferably relates to a carpet base made of glass fibers which is reinforced by warp threads, preferably made of nylon.
• DE-A-36 05 830 describes a carrier web made of a laminate which is composed of a polyester fleece and a mineral fiber fleece, the mineral fiber fleece being reinforced by longitudinal threads made of a mineral material, preferably of glass. Similar layered nonwovens with high modulus reinforcing fibers are described in DE-A-39 41 189.
• the materials known from these two publications contain reinforcing fibers, the force-elongation behavior of which differs greatly from that of the nonwoven filaments. This difference is deliberately used there to achieve the highest possible initial modulus of the laminate.
• the reinforcing yarn applied to the nonwoven is also used simultaneously as a binding fiber.
• the materials described in these documents show a tendency to delaminate under strong thermal and mechanical stress and are therefore less suitable for producing bituminized nonwoven webs.
• An object of the present invention is to provide a nonwoven fabric which exhibits high mechanical stability with a low basis weight and which offers very good processing properties both in the bituminization and in the further processing of the bituminized sheet.
• this object is achieved by a polyester nonwoven web consolidated by binders, which is reinforced by coulters of parallel reinforcing yarns, the nonwoven fabric consisting of polyester fibers and having a basis weight of 20-200 g / m 2 the reinforcement yarns running in parallel consist of polyester yarns and have a maximum tensile strength extension similar to the polyester fibers of the nonwoven fabric.
• the nonwoven fabric of the filament-reinforced nonwoven web according to the invention can consist of staple fibers or continuous fibers.
• nonwovens made from continuous fibers are preferred, in particular so-called spunbonds.
• the reinforcing yarns of the nonwoven web according to the invention preferably have a maximum tensile elongation of 20-60%.
• the fineness-related strength is 20 to 40 cN / tex, preferably 30 to 35 cN / tex.
• the filaments of the nonwoven and the Reinforcement yarns have a similar maximum tensile elongation. Similar in the sense of this invention means that the maximum tensile strength expansions of nonwoven and reinforcing yarn differ by no more than about 20 percentage points, preferably by no more than 10 percentage points, in particular by no more than 5 percentage points. In general, the maximum tensile elongation of the nonwoven filaments is chosen so that it is less than that of the reinforcing yarns.
• Nonwovens according to the invention in which a very high usage load is to be expected, can advantageously be reinforced with a yarn whose maximum tensile strength is below that of the nonwoven filaments.
• the titer of the reinforcing yarns is advantageously 50 to 200 dtex. In special cases, where a lower or a particularly high mechanical strength is desired, a lower or higher titer of the reinforcing yarns can of course also be indicated.
• the boiling shrinkage of the reinforcing yarns is preferably 5 to 10%.
• Their hot air shrinkage at 200 ° C is preferably 8 to 10%.
• the stated values of the cooking shrink and the hot air shrink at 200 ° C were carried out in accordance with the test standard DIN 53 866.
• the filament-reinforced nonwovens according to the invention contain 1 to 20, preferably 2 to 13 reinforcing yarns per cm of nonwoven width.
• polyester material In principle, all known types suitable for fiber production come into consideration as polyester material.
• Such polyesters consist predominantly of building blocks which are derived from aromatic dicarboxylic acids and from aliphatic diols.
• Common aromatic dicarboxylic acid building blocks are the divalent residues of benzenedicarboxylic acids, especially terephthalic acid and isophthalic acid;
• Common diols have 2-4 carbon atoms, with the ethylene glycol being particularly suitable.
• Nonwoven webs according to the invention which consist of a polyester material that consists of at least 85 mol% of polyethylene terephthalate are particularly advantageous.
• dicarboxylic acid units and Glycol units which act as so-called modifiers and which allow the person skilled in the art to specifically influence the physical and chemical properties of the filaments produced.
• dicarboxylic acid units are residues of isophthalic acid or of aliphatic dicarboxylic acid such as, for example, glutaric acid, adipic acid, sebacic acid;
• diol residues with a modifying action are those of longer-chain diols, for example of propanediol or butanediol, of di- or tri-ethylene glycol or, if present in small amounts, of polyglycol with a molecular weight of approximately 500-2000.
• Polyesters containing at least 95 mol% of polyethylene terephthalate are particularly preferred, in particular those made from unmodified PET.
• nonwovens according to the invention can be used as binders e.g. the usual polymers, which are applied in the form of dispersions, contain.
• binders e.g. the usual polymers, which are applied in the form of dispersions, contain.
• nonwovens according to the invention which are strengthened by melt binders or thermomechanically are particularly preferred.
• the nonwovens according to the invention are produced by depositing the fiber material on a moving storage surface.
• Known fiber storage members are used depending on whether staple fibers or, as preferred, continuous fibers are to be deposited.
• Spinning beams are expediently used for the storage of continuous fibers, from which a fiber curtain is spun into a spinning and stretching shaft, in which the fibers are simultaneously cooled and accelerated and thus stretched by a fluid flow.
• the reinforcing yarns are expediently introduced from a warp beam, from which the yarns run in between two non-woven layers, which are deposited on the same tray by two rows of storage elements arranged one behind the other in the transport direction.
• a device suitable for this method is in DE-A-23 10 542 and in DE-A-39 41 189 has been described.
• the selection of the reinforcing yarns used for the production of the filament-reinforced nonwovens according to the invention is based on the criteria specified above for these yarns.
• the nonwoven is solidified in a manner known per se by applying, for example spraying on, binder solutions or dispersions, or preferably by introducing melt binders and subsequent heat treatment at a temperature at which the melt binder melts and the supporting filaments of the nonwoven on them Crossing points connects.
• the melt binder is particularly advantageously introduced into the nonwoven in the form of binding filaments. These can be present as separate filaments if, for. B.
• spun out of separate openings of the spinning beam and evenly distributed in the draining fiber curtain or they can be present as a sheath or side of the supporting filaments or part of the supporting filaments if appropriate nozzle openings for spinning core-sheath filaments or side-on Side two-component filaments are provided in the spinning beam.
• thermomechanical consolidation which is also known per se and which is usually carried out by calendering with a hot calender.
• the nonwoven webs according to the invention show no tendency to delamination, even under extreme thermal-mechanical stress.
• the strength of the webs in the longitudinal direction far exceeds the usual values of nonwovens of comparable basis weight.
• the puncture resistance increases, as expressed in the punch penetration test according to DIN 54 307. This results in significantly improved workability and increased work safety when laying the bituminized roofing membranes according to the invention on the roof.
• Another object of the present invention is a bituminized roofing membrane and a bituminized roofing membrane which contains a filament-reinforced nonwoven fabric web according to the invention.
• bituminized roofing membranes or roofing membranes are produced by impregnating and / or coating the reinforcement membranes according to the invention with molten bitumen in a manner known per se.

Applications Claiming Priority (2)

Publications (1)

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Cited By (7)

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Citations (5)

• 1992
  • 1992-03-26 FI FI921325A patent/FI921325A/fi not_active Application Discontinuation
  • 1992-03-26 EP EP92105219A patent/EP0506051A1/fr not_active Withdrawn
  • 1992-03-27 IE IE099992A patent/IE920999A1/en unknown
  • 1992-03-27 NO NO92921203A patent/NO921203L/no unknown
  • 1992-03-27 JP JP4071210A patent/JPH0598551A/ja active Pending

Patent Citations (5)

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