CN1605668A - Composite open band yarn for paper machine felt and its production method - Google Patents

Abstract

A base fabric, in particular for use as machine clothing for paper machines or as a textile for other industrial processes, is described. The base fabric comprises at least one combination yarn of filaments which are produced from polyamide and thermoplastic polyurethanes.

Description

Composite twist yarn and production method thereof that the paper machine felt is used

Technical field

In the machinery that paper, cardboard, paper oar or similar products production are adopted, fiber pulp placed squeezer two pressure rollers or at guide plate (shoe) squeezer, extruding is carried out partial dehydration and is handled between pressure roller and press guide plate.For consideration economically, be preferably in usually and from fiber pulp, remove most of water in this press section.In the nearly many decades, further investigate the felt or the fabric of the usefulness of the suitable paper machine press section dehydration of having developed complete novelty.By means of these novel paper machine clothings, might satisfy growing strict demand to dewatering efficiency.

Simultaneously, also proof is owing to strengthen to seek the result of the material that speed greatly improves after novel paper machine clothing is installed, the speed of service that might bigger raising paper machine.Other characteristic also is improved such as operation action, shock resistance and ABRASION RESISTANCE.

The present invention relates to novel (base) cloth that the paper machine felt is used, specifically is the squeezer felt that performance improves, especially flexible raising on the felt thickness direction, and compressibility is bigger, and the water absorption rate in the paper production process in the cephalocaudal useful life of felt improves.

Background technology

Because in the supports fabrics process that production paper machine felt is used, through at least and/or weft direction with the composite yarn of polyamide and thermoplastic polyurethane silk, particularly 1 to 20 polyamide 6 and/or polyamide 4,6, polyamide 6,10, polyamide 6,12, the twisted yarn of polyamide 11 or polyamide 12 monofilament and 20 to 1 thermoplastic polyurethane monofilament composite twists, twisted yarn or each monofilament yarn that replacement only is made of polyamide monofilament reach purpose of the present invention.

The production method of thermoplastic polymer monofilament generally from prior art just can learn (consult Handbuchder Kunststofftechnik (plastics technology handbook), C.Hauser-Verlag, Munich 1986, pp295-319).

The textbook that Lehrbuch der Papier-und Kartonerzeugung[paper and Board is produced], VEB-Fachbuchverlag 1987, p190 and after) school bag contained the information of modern paper machine paper, for example about paper be shaped (forming section), mechanical dehydration (press section) and thermal dehydration (dry cadre) and smooth (press polish) and batch.The fabric that the paper forming section is used mainly is made up of monofilament polyester.In order to improve its ABRASION RESISTANCE, based on polyamide monofilament together with Polyester Filament in order to substitute the filament transversely of paper machine.

Squeezing in the press section constitutes with the needle punched fabric base cloth of felt by one or more layers nonwoven fabric.These squeezings in fact only by polyamide fiber and polyamide monofilament, mainly are pure polyamide 6 or polyamide 6 with felt, and 6 long filaments make.

Industry based on the squeezing of polyamide 6 monofilament with felt with respect to the felt that also may make with other material such as polypropylene/polyester or wool because its good ABRASION RESISTANCE, high-compressibility and by behind the squeezer roll gap well recovery have obvious advantage.

The cadre is last one that is used for paper machine with fabric, and it is routinely by through stabilizing agent, as Stabaxol ^(by Rheinchemie, the commodity that Mannheim produces) stablizes and the monofilament polyester composition of the anti-hydrolytic degradation of energy.

Particularly the squeezing of more following types generally can be learnt from prior art with felt.

Patent specification US-A-4,323,622 disclose high elasticity dehydration felt, for example are used for paper machine or cellulose machine, and wherein the elasticity of felt is to obtain by mixing the thermoplastic elastomer (TPE) molecule.Perhaps, add the macromolecular elastomer material of carbamate groups and obtain required elasticity.Yet elasticity is along vertically in this structure, and elastomeric material can to elongate be two times of its former length at least, and it finally immediately is returned to its original length again basically in case remove load from fabric.

Yet according to US-A-4, the shortcoming of 323,622 prior art is serious.The height stretching of material can cause the undesirable stretching of fabric in the paper machine, causes the undesirable in the vertical stretching of paper equally, but in horizontal contraction.This large-size of fabric changes the fold that can cause felt and paper usually, and it causes the fracture of paper again.Vertically (MD) speech described here means and the parallel direction of felt for paper making machine motion.

Patent specification US-A-4,533,594 disclose felt for paper making machine, and wherein mesh layer is the fabric that one deck is combined by radially yarn and broadwise yarn successively.Here the yarn of crossed orientation is the multifilament textile of nylon, polyester or polyacrylonitrile that polyurethane coating is arranged.The purpose of described patent specification provides wad a quilt with cotton the again felt for paper making machine of (batt-on-mesh) type of a kind of mesh, and wherein the resilience of mesh fabric obviously improves.Described textile-like among the patent specification US-A 4,731,281, wherein fabric is made by (encapsulated) monofilament yarn of complete encapsulate.In order to give the fabric pick resistance, spun yarn is coating in advance before weaving.Can regulate coating, make spun yarn be different from its thickness in the horizontal at thickness longitudinally.

According to US-A 4,533, the shortcoming of 594 above-mentioned prior art is serious.Coating is made up of another kind of polymer on the monofilament, and only physics is bonded in core silk (core filament) on every side.Coating only is a chemical adhesive very weakly.This meaning coating can be out of shape or be moved on the core silk, must cause the decreased performance of original requirement.The needle-punching method of producing in the felt for paper making machine process has infringement to this coating usually, and this can cause again can not keep original performance.Except these shortcomings, the coating on the heart yarn only accounts for the part in spun yarn cross section.Therefore actual strain occurs over just on the very little part of shell, and is less to elasticity effect.The former character that almost only depends on the heart yarn material of stretching/answer based on the fabric of this class spun yarn.

Patent specification US-A 5,360,518 has narrated the press fabric of another kind of coated yarn, and it can be used for the press section of paper machine.It comprises sandwich construction, the bottom that one deck thin paper contact surface and one deck are firm.One deck in the two-layer or more multi-layered yarn weaving layer comprises the multicomponent yarn of multiply load-bearing twisted wire.Multicomponent yarn can be multifilament or the multi cord that thin polyamide filament constitutes.They also can be to be coated with the polyurethane monofilament yarn, and the squeezing that provides has the compression rebound structure with fabric.Die head multifilament (die multifilament) or multistrand yarn can be coated with polyurethane equally.The shortcoming of existing technology and US-A 4,533, the shortcoming of the fabric known to 594 is similar.The powerful coating bonding of its easier acquisition and multifilament textile.Yet this class yarn also has the identical restrictive shortcoming of monofilament heart yearn that applies with above-mentioned monofilament.Often repeatedly in the squeezer roll gap during the pressurized (orders of magnitude of millions of press operation), coating stripping or be out of shape on heart yarn descends the effect of original requirement.

At patent specification US-A-5, in 194,121, attempt to make and have high elasticity, the felt of recovery and durability, flexible component in the felt fibrage.Yet this specification is described polyurethane and can not be used for fiber is fixed on needling process on the base cloth.As a kind of solution of replacement, suggestion is adopted to have hard section and replaces with soft section polyamide block copolymer.

Did various trial, improved polyamide and thermoplastic polyurethane's performance by mixed polymer in extrusion method.Disclosed patent application DE 19 829 928 A2 have narrated the manufacture method of the filamentary material that comprises polyamide and thermoplastic polyurethane mixture.Yet these two kinds of melting point polymers differ widely, and cause special processing problems.The filament strength of making is less than conventional polyamide.And observing cross-section elasticities only has raising slightly.If in extrusion in extruder overstand, the thermal degradation of thermoplastic polyurethane is also very disadvantageous.

Patent specification US-A-6,514,386 have narrated felt for paper making machine, it is believed that it still shows superior elasticity in the long duration, and it is formed together with the independent rete of the extension bulge that has horizontal orientation by base cloth with by the needle punched non-woven fabrics layer.This class film can be provided with on the base cloth or between each layer of felt.Therefore, felt for paper making machine can be smoothly by the reeling end of paper machine, and than antifatigue, this fatigue is owing to squeezing occurs in the squeezer crack repeatedly.

Make viewpoint from felt, it is a kind of danger close operation that elastic layer is laminated on the firm base cloth, because be easy to generate fold and out-of-flatness.The edge of film must connect, so these zones are always imperfect.

Although generally can imagine in squeezing and can use thermoplastic polyurethane (TPU) monofilament in the base cloth of felt and/or based on the twisted yarn of TPU monofilament.But having probably, those skilled in the art can expect serious processing problems at the beginning, because have high elasticity, high extensibility and have high coefficient of friction based on the monofilament of thermoplastic polyurethane.Therefore, the TPU monofilament is only processed under the relatively large condition of diameter and under tension force.The yarn and the fabric that adopt this mode to make have not by the shortcoming of paper machine book that industry connects.DIMENSIONAL STABILITY and paper machine are not vertically allowed with horizontal tension force.Because elastomeric yarn is highly tensile, this kind fabric vertically has low modulus, in laterally high contraction.These shortcomings can partly be overcome by this textile-like layer is pressed onto another polyamide fabric.Yet because this class double-basis cloth (twin base fabric) stretching/recoverability difference is too big, problem still exists.For example, the curling injustice of fabric edge is exactly the result of opposed facing base cloth misalignment.

Technology contents

The shortcoming great majority that are surprised to find above-mentioned prior art now are avoidable, if the TPU monofilament is processed simultaneously with one or more polyamide monofilament and/or polyamide multifilament, make industrial base cloth,, and then weave if particularly they are earlier through twisting.These composite yarns (twisting) be can also be surprised to find and can base cloth or felt be changed in the mode identical with the pure polyamide yarn of routine based on thermoplastic polyurethane and polyamide monofilament.

The invention provides a kind of base cloth, the machine cloth that it is especially used as paper machine or the textiles of other industrial process.Its feature is that base cloth contains the composite yarn of at least one polyamide and TPU monofilament.

Thermoplastic polyurethane (TPU/ polyamide (PA)) composite yarn or only form at least or by initial going with last twisting (different directions twisting) by initial twisting (direction twisting).The TPU/PA composite yarn is preferable uses the vertical and/or transversely arranged of felt along the paper machine squeezing.

The characteristics of preferable base cloth are that polyamide is selected from polyamide 4,6, polyamide 6, polyamide 6,6, polyamide 6,12, polyamide 6,10, polyamide 11 and polyamide 12, and together with the copolyamide of described polymer or the selected property mixture of these polyamide.

In better embodiment, composite yarn is by straight, and the silk of promptly untwisted polyamide and thermoplastic polyurethane is made.

In the version (variant) of preferred base cloth, composite yarn is made by the polyamide and the thermoplastic polyurethane silk of part twisting at least.

In another embodiment of base cloth, above-mentioned composite yarn comprises 1-10, the compound of 000 polyamide monofilament and 20-1 root thermoplastic polyurethane monofilament.

Preferred especially base cloth composite yarn is the compound of 1-20 root polyamide monofilament and 20-1 root thermoplastic polyurethane monofilament.

It is that the diameter of monofilament is 0.05-2mm in the composite yarn (polyamide and/or TPU monofilament) that particularly preferred base cloth also has characteristics.

A concrete advantage of above-mentioned base cloth is that it directly adopts existing paper machine manufacturing technology, comprises twist thread mechanism and loom manufacturing commonly used.

Another advantage is that the elastic modelling quantity of polyamide is vertically still keeping, and can combine with the thermoplasticity polyamides ammonia elastic modelling quantity on the fabric thickness direction.

Can also find not only have higher very water separation capability with felt, and comparatively fast reach higher degree of dehydration that compare with felt with the squeezing of described TPU/ polyamide-based composite yarn useless manufacturing, the water separation capability retention time is longer based on the squeezing of base cloth manufacturing of the present invention.And if find that also used squeezing felt is to form by means of above-mentioned base cloth manufacturing, the vibrations of paper machine also further reduce.

Drying process institute energy requirement when papermaking process finishes as a result consumes less.Perhaps, paper machine is operated with more speed under same energy consumes.

Compound yet can being processed into of TPU/PA polymer filament do not twisted.After making TPU and polyamide monofilament be wrapped on the bobbin simultaneously and can accomplish this point.The thermoplastic polyurethane that is suitable for making the TPU silk is based on polyester or any a kind of extrusion grade Polyurethane Thermoplastic Elastomer of polyethers level, and its Shore hardness is preferably Shore A75-99.

Polyurethane Thermoplastic Elastomer (TPU) industrial be important because they have excellent mechanical properties, and can adopt cheaply the melting method method to process.By adopting different chemical synthesis components, its mechanical performance can be in wide variation very.At Kunststoffe 68(1978), pp 819-825 and kantschuk, Gammi, Kunstsoffe 35(1982) among the pp 568-584 relevant for the general introduction of character and the purposes of TPU.

TPU is generally polyester or polyether polyol by the line style polyalcohol, and organic diisocyanate and short-chain diol (cahin extension agent) are synthetic.Can add catalyst in addition, promote the carrying out of reaction.The mol ratio of synthetic component can in very large range change, and can adjust the character of product thus.The mol ratio of polyalcohol and cahin extension agent is 1: 1-1: 12 are proved to be effectively, and the Shore hardness of product is between Shore A 70-Shore D 75.Elastomeric synthesizing of melt-processable polyurethanes can be carried out (prepolymer process) step by step or be carried out (one-step method) by the reaction simultaneously in a step of all reactive components.In prepolymer process, the prepolymer that contains isocyanates is generated by polyalcohol and vulcabond, prepolymer and cahin extension agent reaction in second step.TPU can produce or discontinuous production continuously.Foremost industrial process is belt method and extruder method.

The polyurethane of adoptable melt-processable can make through reaction by making the component that generates polyurethane according to the present invention.

A) organic diisocyanate,

B) molecular weight is the line style polyalcohol of hydroxyl at the end of 500-5000,

C) molecular weight is at glycol or the diamine chain extender of 60-500.

Wherein, A) in NCO group and B) and C) in the mol ratio of isocyanate reaction base be 0.9-1.2.

Organic diisocyanate A), for example can be thought of as aliphatic series, alicyclic, araliphatic, heterocycle and aromatic diisocyanates, these are at Justus Liebigs Annalen der Chemie, and 562, narration is arranged among the pp75-136.

Specify for example below: aliphatic vulcabond, as hexamethylene diisocyanate; Alicyclic diisocyanate, as isophorone diisocyanate, 1,4-cyclohexane diisocyanate, 1-methyl-2,4-cyclohexane diisocyanate and 1-methyl-2,6-cyclohexane diisocyanate and corresponding isomer mixture; 4,4 '-dicyclohexyl methyl hydride diisocyanate, 2,4 '-dicyclohexyl methyl hydride diisocyanate, 2,2 '-dicyclohexyl methyl hydride diisocyanate and corresponding isomer mixture; Aromatic diisocyanates, as 2,4-toluene di-isocyanate(TDI), 2,4-toluene di-isocyanate(TDI) and 2, the mixture of 6-toluene di-isocyanate(TDI), 4,4 '-'-diphenylmethane diisocyanate, 2,4 ' '-diphenylmethane diisocyanate and 2,2 ' '-diphenylmethane diisocyanate, 2,4 ' '-diphenylmethane diisocyanate and 4, the mixture of 4 '-'-diphenylmethane diisocyanate; Urethane-modified liquid 4,4 '-'-diphenylmethane diisocyanate and 2,4 '-'-diphenylmethane diisocyanate, 4,4 '-two isocyanide roots close-1,2-diphenylethane and 1,5-naphthalene diisocyanate.The preferred compound that uses is 1, hexamethylene-diisocyanate, different Buddhist ketone vulcabond, dicyclohexyl methyl hydride diisocyanate, 4,4 '-'-diphenylmethane diisocyanate content is greater than the '-diphenylmethane diisocyanate of 96 weight %, isomer mixture particularly 4,4 '-'-diphenylmethane diisocyanate and 1, the 5-naphthalene diisocyanate.Above-mentioned vulcabond can use separately, or uses with mutual form of mixtures.They can also with the polyisocyanates up to 15 weight % (with respect to the total amount meter of vulcabond), as triphenylmenthane 4,4 ', 4 " triisocyanate or polyphenyl polymethylene polyisocyanates use together.

As B component) line style terminal for the polyalcohol molecular weight of hydroxyl be 500-5000.Because the cause of production method, these polyalcohols often contain a small amount of non-linearity compound, thereby often are referred to as the substantial linear polyalcohol.Polyester in these polyalcohols, polyethers, PCDL or their mixture are preferable.

Suitable PTMEG can be contained with combination at starting molecule to react under the condition of 2 active hydrogen atoms and forms by the alkylene oxide that has 2-4 carbon atom on one or more alkylidenes.The example of above-mentioned alkylene oxide has: oxirane, 1,2 epoxy prapane, 3-chloro-1,2 expoxy propane and 1,2-epoxy butane and 2,3-epoxy butane.Oxirane, expoxy propane, and the mixture of 1,2 epoxy prapane and oxirane preferably uses.Alkylene oxide can use separately or use in order or use with form of mixtures.Starting molecule for example can be thought of as: water, and amino alcohol, such as N-alkyl diethanol amine, as N methyldiethanol amine, and glycol, as ethylene glycol, 1, ammediol, 1,4-butanediol and 1,6-hexylene glycol.Also can choose the mixture that uses starting molecule wantonly.Suitable PTMEG can also be the polymerizate of hydroxyl oxolane.The trifunctional polyethers also can use with 0-30 weight % ratio with respect to two functional polyethers, but will make this amount can obtain the melt-processable product at most.The molecular weight of basic straight chain line style PTMEG is 500-5000.They can use separately, or mix mutually and use.

Suitable polyester-diol is for example by having 2-12 carbon atom, the dicarboxylic acids of a preferable 4-6 carbon atom and polyalcohol preparation.Dicarboxylic acids for example can be thought of as: aliphatic dicarboxylic acid, and as succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid and decanedioic acid, and aromatic dicarboxylic acid, as phthalic acid, M-phthalic acid and terephthalic acid (TPA).Dicarboxylic acids can use separately, or uses with the form of mixtures of mixture such as succinic acid, glutaric acid and adipic acid.In order to prepare polyester-diol, can be without dicarboxylic acids, replace the optional derivative that uses corresponding dicarboxylic acids, comparatively favourable as the acyl chlorides (carboxylic acid chloride) that in pure line base, has carboxylic acid diesters, carboxylic acid anhydrides or the carboxylic acid of 1-4 carbon atom.Examples of polyhydric alcohols is for having 2-10 carbon atom, and the glycol of a preferable 2-6 carbon atom is as ethylene glycol, diethylene glycol (DEG), 1,4-butanediol, 1,5-pentanediol, 1,6-hexylene glycol, 1,10-decanediol, 2,2-dimethyl-1, ammediol, 1, ammediol and dipropylene glycol.Depend on required character, polyalcohol can use separately, also can randomly use with mixture.Carbonic acid and described glycol, particularly those have the glycol of 4-6 carbon atom, as 1,4-butanediol or 1, the reacted ester of 6-hexylene glycol, hydroxycarboxylic acid also is fit to as the condensation product of hydroxycaproic acid and the lactone polymeric reaction product as the optional caprolactone that replaces.The preferred polyester-diol that uses is the ethylene glycol polyester adipate, 1, and 4-butanediol polyester adipate, ethylene glycol/1,4-butanediol polyester adipate, 1,6-hexylene glycol/neopentyl glycol polyester adipate, 1,6-hexylene glycol/1,4-butanediol polyester adipate and polycaprolactone.The molecular weight of polyester-diol is 50-5000, and can use separately or use with mutual mixed form.

Molecular weight is glycol or the diamines of 60-500, preferably has the aliphatic diol of 2-14 carbon atom, as ethylene glycol, and 1, the 6-hexylene glycol, diethylene glycol (DEG), dipropylene glycol, particularly 1, the 4-butanediol can be used as cahin extension agent C).Terephthalic acids also is suitable for the diester of the dihydroxylic alcohols with 2-4 carbon atom, as the two ethylene glycol of terephthalic acid (TPA) or terephthalic acids pair 1,4-butanediol, the hydroxy alkylidene ether of quinhydrones (hydroxyalkylene ether), as 1,4-two (ethoxy) quinhydrones, the ethoxylation bis-phenol, (ring) aliphatic diamine is as isophorone diamine, ethylenediamine, 1, the 2-propane diamine, 1,3-propane diamine, N-methyl propylidene 1, the 3-diamines, N, N '-dimethyl ethylene diamine and aromatic diamine, as 2,4-toluenediamine and 2,6-toluenediamine, 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine and, two-, three-, 4 of four primary alkyls replacement, 4 '-diaminodiphenyl-methane.Also can use the mixture of above-mentioned cahin extension agent.Also can use a spot of triol in addition.

For example the small quantities of usual monofunctional compound can be used as chain terminating agent or releasing agent.Alcohols as octanol and octadecanol or amine, can be used as their example as butylamine and octadecane amine.

In order to make TPU, choose wantonly in the presence of catalyst, synthetic component, auxiliary agent and additive react with the equivalent proportion of NCO reactive group total amount by certain NCO base, specifically be the NCO base and the ratio of the equivalent of the OH base of low molecular weight diols/three pure and mild polyalcohols is 0.9: 1.0-1.2: 1.0, be preferably 0.95: 1.0-1.10: 1.0.

The known suitable catalyst of the present invention of prior art is conventional tertiary amine, as triethylamine, and dimethyl cyclohexyl amine, N-methylmorpholine, N, N '-lupetazin, 2-(diformazan ammonia ethyoxyl) ethanol, diaza two heterocycles (2,2,2) octane, and analog, and organo-metallic compound particularly, as titanate esters, iron compound, tin compound, as oxalic acid tin, two tin octoates, the dialkyl tin of two laurate tin or aliphatic carboxylic acid, as dibutyltin diacetate, dibutyl tin laurate etc.Preferred catalyst is organo-metallic compound, particularly titanate esters, the compound of iron or tin.

Except TPU compound and catalyst, also to add other auxiliary agent and additive.Be described example below: lubricant, as fatty acid ester, their metallic soap, fatty acid amide and silicone compounds, anti-blocking agent, inhibitor, the stabilizing agent of anti-hydrolysis, light or heat effect and decolouring, fire retardant, dyestuff, pigment, inorganic or organic filler.Details about mistake auxiliary agent and additive can be consulted the document that the relevant expert writes, as J.H.Saunders, " the High Polymers " of K.C.Frisch, Vol.XVI, Polyurethane, Part 1 and 2, Interscience Publisher 1962 and 1964, R.Gachter, H.Muller (eds.): Taschenbuch der Kunststoff-Additive[plastics additivehandbook], 3 ^RdEdition, Hanser Verlag.Munich 1989 or DE-A 29 01 774.

And other additive that is incorporated into TPU is thermoplastic, as Merlon and acrylonitrile/butadiene/styrene terpolymer, particularly ABS.Some other elastomer, as rubber, the copolymer of Ethylene/vinyl acetate, the copolymer of phenylethylene/butadiene, and other TPU can use equally.Technology plasticizer commonly used, as phosphate, phthalic acid ester, adipate ester, sebacate and alkyl sulfonic ester also are suitable for adding.

The TPU that the present invention uses can make continuously by " extruder " method, as making in multiscrew extrusion machine.TPU component A, B and C can react in proportion simultaneously, i.e. and one-step method, or reaction is in order promptly reacted by prepolymer process.Originally the prepolymer here can drop in batches, in a certain section continuous output of extruder, or in the upstream the continuous output in independent pre-polymerization unit.

TPU and polyamide monofilament adopt this production method preparation to be generally known in the art.

The present invention provide also that silk that preparation made by polyamide and thermoplastic polyurethane make thread the method for composite yarn, wherein polyamide and thermoplastic polyurethane monofilament are sent into the mechanism that twists thread with 5-50m/ minute speed, at 0.1cN/tex at least, preferable 0.2-4cN/tex, the twisting down of the tension force of best 0.3-0.8cN/tex, wherein tension force is for the TPU monofilament.

In a preferred method, polyamide monofilament is by polyamide 4,6, polyamide 6, polyamide 6, and 6, polyamide 6,12, polyamide 6,10, polyamide 11 and polyamide 12, or the select copolymer of these polyamide or mixture are formed.

In another special method for optimizing, the TPU monofilament is sent into the conveyer of the mechanism that twists thread under the feed tension of regulation, twist with polyamide filament then.

In another method for optimizing, the feed tension that it is characterized in that TPU monofilament regulation produces by another TPU conveyer, and wherein the transfer rate of TPU conveyer will be lower than the transfer rate of PA monofilament conveyer.

Following embodiment illustrates the advantage of the present invention about the employing composite yarn, but the present invention is not limited to these embodiment.

The specific embodiment

Embodiment

The explanation of twisting operation

The twisting characteristics:

The initial twisting of monofilament is made up of a TPU monofilament and at least one polyamide monofilament and/or polyamide multifilament at least.At least two so initial twisted lines twisting form twisted yarn (final twisting) together, weave processing again.

The manufacturing of the PA/TPU composite yarn of twisting:

The TPU monofilament must be sent into the conveyer of the mechanism that twists thread under the transmission tension force of regulation, send into the mechanism that twists thread with polyamide monofilament then and twist.The TPU monofilament is manufactured, and the PA monofilament is taken from around the yarn tube.

Two kinds of monofilament are sent into a public bobbin, and coiling speed is by the transfer rate decision of PA monofilament.Because the transfer rate of TPU monofilament is slower, thereby with respect to the PA monofilament, it accepts certain feed tension.

Adopt the body plan of Alma Saurer AZB-T type twisting machine to make initial twisted lines, and be used for twisting subsequently step.

Claims (13)

1. base cloth, it especially as the machine cloth of paper machine or the textiles that other industrial process is used, is characterized in that: described base cloth comprises at least one composite yarn of being made silk by polyamide and thermoplastic polyurethane.

2. base cloth as claimed in claim 1, it is characterized in that: described polyamide is selected from polyamide 4,6, polyamide 6, polyamide 6, and 6, polyamide 6,12, polyamide 6,10, polyamide 11, polyamide 12, the copolyamide of above-mentioned polyamide or the selected mixture of these polyamide.

3. as claim 1 and 2 each described base cloths, it is characterized in that: described composite yarn is made by the silk of untwisted level and smooth polyamide and thermoplastic polyurethane.

4. as claim 1 and 2 each described base cloths, it is characterized in that: described composite yarn is made by the twisted filament that adds of a part of polyamide or thermoplastic polyurethane at least.

5. as each described base cloth of claim 1 to 4, it is characterized in that: described composite yarn comprises 1-10, the composite yarn of 000 polyamide monofilament and 20-1 root thermoplastic polyurethane monofilament.

6. base cloth as claimed in claim 5 is characterized in that: described composite yarn comprises the compound of 1-20 root polyamide monofilament and 20-1 root thermoplastic polyurethane monofilament.

7. as each described base cloth of claim 1 to 6, it is characterized in that: the diameter of monofilament is at the 0.05-2mm order of magnitude in the composite yarn.

8. a silk of being made by polyamide and thermoplastic polyurethane is made the method for composite yarn, it is characterized in that: polyamide and thermoplastic polyurethane monofilament are sent into the mechanism that twists thread with 5-50m/ minute speed, then at 0.1cN/tex at least, preferable 0.2-4cN/tex, the TPC monofilament tension force of best 0.3-0.8cN/tex is twisted together down.

9. method as claimed in claim 8, it is characterized in that: polyamide monofilament is based on polyamide 4,6, polyamide 6, polyamide 6, and 6, polyamide 6,12, polyamide 6,10, the selected mixture or the copolyamide of polyamide 11, polyamide 12 or these polyamide.

10. method as claimed in claim 8 or 9 is characterized in that: described TPU monofilament transmits under the tension force in the regulation of conveyer and is transported to the mechanism that twists thread, and twists with polyamide filament then.

11. as each described method of claim 8 to 10, it is characterized in that: the regulation feed tension of TPU monofilament produces by means of another TPU delivery unit, and the transfer rate of TPU conveyer is lower than the transfer rate of PA monofilament conveyer.

12. as each described method of claim 8 to 11, it is characterized in that: it is to be drawn the silk of TPU winding reel and produced by tension control roll that the regulation of TPU monofilament transmits tension force.

13., it is characterized in that as each described method of claim 8 to 11: the regulation of TPU monofilament transmit tension force be by the TPU monofilament with the common close wind of polyamide monofilament to the winding reel that transmits tube as the mechanism that twists thread and produce.