CN1236117C - Improved process and apparatus for stretching slivers of animal fibres - Google Patents

Abstract

A method and apparatus for creating a transient equivalent of thermoplasticity in wool or animal fibres, such that they can be extended by substantial amounts without breaking and without requiring to be at high moisture regain or chemically treated to increase plasticity. In one version a process is provided for stretching sliver in which the sliver is passed in a substantially straight line path through a stretching zone from feed rollers to a single haul pulley unit. False twist generated by the haul pulley unit is freely propagated along the sliver uninhibited by contact with pulleys or other devices.

Description

Improving one's methods and equipment of stretching slivers of animal fibres

FIELD OF THE INVENTION

The present invention relates to the processing method of animal fiber.More particularly, though be not unique aspect, the present invention relates to improve diameter, the length of wool and animal fiber and the improved method and apparatus that curls.According to the condition of selected method, this improvement can be temporary transient or permanent.

The background of invention

The stretching of temporary set

High-shrinkage fibre has the shrinkage factor of 15-30% usually, and known have a multiple use in textile industry.They can be used for knitting as the high bulk yarn component, and high bulk yarn is exactly the common very big yarn of volume and mass ratio.They also are used for making high-shrinkage yarn, mix generation gauffer effect, for example seersucker in woven fabric with low or zero pulled down yarn.They can also be used to making the high shrinkage yarn, for example form the part tufting in the carpet at fleece, make the shrinkage factor difference between the tufting of height and low-shrinkage produce high and low pile or length and short tufting, and purpose is the formation visual pattern.Preferably adopt simple and not expensive method, for example steaming method just can realize being used for the potential contraction of fiber of this purpose.A kind of method of the potential high-shrinkage fibre of well-known and widely used manufacturing is to be heat and relatively it being stretched during plasticity at thermoplastic fibre, takes advantage of then and cools off when it is in extended state, makes set-stretching thus.Because fiber is not perfect plasticity in the hot-stretch process, but viscoelastic, thus certain elastic strain in the molecular structure of fiber, produced, but this energy shortage causes contraction with the relative fixed that overcomes structure after cooling.When fiber heated subsequently, the structure of fiber just became and is easier to flow, and " potential elastic strain energy " just can cause contraction.This method through being usually used in making the high acrylic fiber that shrinks, adds man-hour in weaving, this fiber again with also be the low shrinkage fibre blend of propylene fibrid usually, make the hosiery yarns of the high-expansion that produces owing to different blockage effects.When the yarn of blend shrinks, low shrinkage fibre shrinkage or form the screw line that radius increases in the yarn texture of twisting, thus increase the volume of yarn.Though the result who shrinks causes the quality of yarn vertical unit section to increase, volume increases more, just realizes the volume of desired increase and the ratio of quality thus.Can adopt the effect of this technology to make the lighter coat of weight.

Being used for forming potential high hot-stretch method of shrinking, is that the acrylic fiber that remains filament form is carried out.The technology of stretching and temporary set continuous long strand is known in the textile industry.Term used herein " temporary set " is meant the long filament that is fixed under extended state, make long filament have potential shrinkage, handles subsequently and just can realize shrinking when for example decatize is lax.Term " bundle " is meant non-twist substantially common thousands of parallel long tow.Continuous filament yarn changes into discontinuous staple fibre usually then, is processed into the usefulness of yarn for further weaving.The fiber of wool and so on is not the form of continuous filament yarn, is not again thermoplastic, so be difficult to stretch and temporary set, therefore stretching and temporary set can't be applied on wool and the animal fiber industrial so far.

These fibers just are subjected to the restriction on the technological deficiency as a result, and their application aspect high bulk yarn are also just hindered.In this connection, the principal element that hinders wool and animal fiber to use is as described below:

1. these fibers are discontinuous, and (when fiber is subjected to than the much smaller power of the desired power of drawing of fiber itself, each other can slippage) usually attenuates when the fibre bundle that contains wool fibre is subjected to " drawing-off ".

2. these fibers are not thermoplastic (being that they usually can not be only have plasticity and can stretch in a large number under the situation that does not rupture by the control temperature)

With reference to following patent, as seen the effort of many stretchings and setting wool fibre bundle is arranged:

1. clamp the continuous non-twist wool fibre bundle that is called " bundle " with some very near clips of spacing (gap length is shorter than most fibers), prevent its drawing-off, and in process, these clips are removed: UK patent 1,189,994.

2. clamp the wool fibre bundle with the very near roller of spacing (gap length is shorter than most fibers), prevent its drawing-off, and the superficial velocity of the roller group of order is increased successively: USP5,459,902.

3. the twisted fibers bundle is enough to make fibre bundle avoid drawing-off under the desired big tensile force effect of the drawing of fiber that applies: UK patent 1,196,419.

4. temporary transient twisted fibers bundle in drawing process, in many other Application Areass, be called " false twisting ", though twisting is genuine, but be temporary transient, purpose is to avoid drawing-off: USP4,961,307 (Cooke), and PCTWO91/02835 (that is: authorize Phillips and Warner U.S. Pat P5477669) and USP5,758,483 (Phillips and Thomas).

Most patents all relate to employing steam and realize temporary set (promptly temporarily fixing under the tensile fiber condition).Here fibre bundle is fixed under stretching condition in saturated vapor atmosphere, is the effective ways of industrial known realization temporary set.In the great majority of these patents, the preplasticizing to a certain degree of wool fibre has been described.Just can realize as long as add entry, or add for example aqueous solution of sodium metasulfite of reductant that these two kinds of methods all are the methods of industrial known raising wool plasticity.For example in the twisting setting of wool carpet industry, what extensively adopt is the reduction of the disulfide bond in the wool fibre, forms in water or steam then again.

Make its plasticizing with reductant preliminary treatment wool fibre, help more permanent setting and promptly fix the fibre deformation (twisting, length elongation or crooked) that any pressure is carried out.What be familiar with in thus should industry is to adopt such technology control degree of setting, from temporary until highly nonvolatil.

Although there is above-mentioned patent to exist, 20 for many years, and above-mentioned technology does not cause temporary transient or the stretching wool of permanent set or the extensive use of animal fiber.Reason is to adopt the method for the very near clip of moving interval or adopt twisting, adopts then to stretch and setting, adopts the method for backtwisting uneconomical again.Though false twisting technology cicada just for a long time in textile industry, but the patent of describing their application in short (wool) fiber that stretches is just to occur recently, and these patents are PCTWO91/02835 (that is: USP5477669) and USP5,758,483 application of method in textile industry of describing are restricted, because their need complicated many pulley systems, in steam, stopped for a long time, need a lot of energy to realize finalizing the design again.An early stage U.S. Pat 3803826A has described in the intrafascicular use false twisting of stretching wool, it is confined to align curling in the wool fibre, compared with the demand of drawing of fiber self, this demand much less, and also it only needs the false twisting of simple friction very-clamp to insert equipment.Under a large amount of needed high-tensions of drawing of fiber, it can not give fibre bundle reliably with enough with consistent false twisting.

The diameter of permanent set and curature variation

Thinner wool fibre is worth higher usually.Compare with thicker fiber, they can be spun into thinner yarn, and this just can make the lighter fabric of weight, and their feel is more soft.Therefore the patent that stretches of the foregoing description temporary set method that also can provide permanent set to stretch reduces the diameter that not influenced by steam or water substantially, and this does not make us being surprised.

Above-mentioned patent is used same Chemical Pretreatment and post processing, and this does not make us being surprised yet.Adopt reductant normally sodium metasulfite make part disulfide bonds in the fiber, thereby make wool fibre plasticity bigger, be well-known and extensive use in some field in woolen industry.After reduction is handled, repeat rinsing or rinsing constitutes in hydrogenperoxide steam generator post processing also is well-known by water, it is as the method that promotes that disulfide bond forms again in the fiber, and can reduce metabisulfite residue in the fiber greatly.

Industrial employing this reduce/process/reoxidize the example of chemical treatment method, be get up washing and WRONZ/ADMGroupLtdTwist-set method of bundle, description is arranged in the following disclosed document:

WRONZ Techline No.T1, WRONZ chemistry setting Yarn-processing system, October, 1988;

The setting wool yarn that J Incs, velvet carpet use, Wool Science Review, 50, November1974,2;

E A Forbes and J H Dinrich，JSDC，96，1980，10.；

The manufacturing of wool carpet, G H Crawshaw edits, The Textile Institute, Manchester, 1987,29.

The fixedly processing of carpet yarn and hydrogen peroxide treatment subsequently before velvet carpet groove beam or strand are dyed, description: C.T.Page is arranged in following document, P.W.Robinson, S.A.Edwards andW.W.Connelly, Winch Beck Dyeing of Wool Carpets, AusiralasianTextiles, 10/2, Narch/Aprcl 1990,52.Use comprises that with oxidant hydrogen peroxide carries out the fabric of post processing, for adopting sodium metasulfite or other reductants to improve the permanent wool that formalizes that the reduction setting is handled, is industrial well-known.For example see: A G de Boos, J Delmenico and M A While, Permanent Press Effects in Wool, Part Vll:Stabilising Set with Additivesto the Wash Liquor, Journal of The Textile Institute, 62,1971,198.

Generally speaking, in the wool textile industry, disulfide bond in the fiber is carried out electronation, then desired shape or structure (for example smooth fabric, Wrinkle fabric, twisted yarn) are handled or be constrained to textile material, at last with the initial reduction division of oxidation processes counter-rotating disulfide bond, be known based on the technology of said process.These processing are called " permanent set " usually and handle in textile industry.

An object of the present invention is to provide a kind of method, it overcomes or alleviates above-mentioned some shortcomings at least, a kind of improved method is provided, and this method adopts the simplified apparatus that a kind of useful alternative can be provided, and stretches and temporary set under the extended state of the wool fibre that forms.

Another object of the present invention is to draw the processing conditions that can change fiber curvature (curling).Usually drawing process can be reduced to the curvature of wool fibre the curvature less than untreatment fiber.Fiber curvature can influence the performance of processing characteristics and end article, and it is a very important specific character.

The general introduction of invention

The invention provides a kind of thermoplastic method of instantaneous equivalence that in wool or animal fiber, forms, they can be stretched under the situation that do not rupture in a large number, do not need to reuptake a lot of moisture content or chemical treatment improves plasticity.

One aspect of the present invention provides a kind of method of drawing of fiber bundle, in this method fibre bundle with straight substantially passage from single angle pulley unit, the stretched district to of feeding roller, by contacting, make false twisting that the angle pulley unit produces unrestricted and freely propagate along fibre bundle with pulley or other devices.

Another aspect of the present invention, a kind of continuously elongated and temporary transient or the wool of permanent set bundle form or the equipment of animal fiber are provided, it comprises a single angle pulley unit that makes fibre bundle produce false twisting and the stretching and drawing effect is provided at drawing zone, form very fast elevated temperature and reduce the microwave dryer of the dry section of false twisting fibre bundle moisture regain, and from feeding roller stretched and dry section to the straight substantially fibre bundle passage of the fibre bundle of angle pulley unit.

Scope of the present invention also comprises:

(a) a kind of providing is stretched and the method for the fiber of temporary set (promptly fixing, as to make them always keep stretching till running into steam or water);

(b) a kind of method that such fiber is provided, it is compared with raw yarn is permanent set, and has following any effect:

Diameter reduces, and curvature (curling) reduces;

Increase curvature, do not change diameter substantially;

Certain combination that reduces diameter and recovery or increase curvature,

According to diameter and the situation that combines of curling, fibre length can increase or shorten, and fiber gloss can improve.

Temporary set stretches

Of the present invention one concrete aspect, provide a kind of and stretch and the method for temporary set animal fiber, it comprises:

The device that applies microwave or RF energy is put into drawing zone, make the wool of false twisting or the enough plasticity that the acquisition of animal fiber bundle can stretch under lower regain situation, and stretch substantially simultaneously.

According to a further aspect in the invention, the method of a kind of improved continuously elongated and temporary set wool or other animal fibers is provided, provide thus to have high potential inotropic fiber, described contraction can realize in decatize relaxation processes or the processing of yew relaxation easily.

The inventive method preferably also comprises such step, adopts the false twisting and the traction of combination, applies the outside, district with energy below the energy applicator angle pulley flier is provided, and makes that fibre bundle is straight through the passage of energy applicator substantially.

This method also comprises and applies microwave or radio frequency, but preferably applies microwave energy, so that the whole thickness of very fast heating fiber bundle.

Drawing of fiber for the preparation temporary set, the preferred regain that adopts is 19-25%, more preferably 20-23%, and " doing " (promptly using the surrounding air balance) fibre bundle or wool top are obtained by steam pipe, this steam pipe designs like this, and the steam drop of condensation is deposited on the fiber.Preferably regain is reduced to 10-15%, more preferably 12-14% realizes temporary set.

The present invention also provides the method for a kind of stretching and temporary set animal fiber, it is included in the Plasitc fibers state that obtains motion under the preferred 19-25% condition of moderate regain, its mode is with being positioned at the line style microwave of linearity sector or radio heater is very fast that fiber temperature is brought up to more than the glass transition temperature under this regain, fibre bundle in described linearity sector by time plasticizing, stretch, then progressively dry.Microwave dryer all is well-known in many industries, and for application-specific, it has many form existence that are used to optimize performance.Wherein a kind of refining form has description in United States Patent (USP) 4908486, it has maximized resonance.The form that the present invention uses is not conclusive or refining, but simple microwave energy generator and fibre bundle linear wave conduit of process therefrom.

In another aspect of this invention, provide single improved angle pulley flier, it is suitable for making a bundle fiber to leave flier along rotating shaft, and it is positioned at and stretches and the dry section back, and making the passage of fibre bundle from feeding roller to flier is straight substantially.The straight channels of fibre bundle helps adopting at whole drawing zone the equilibrium of line style heater and fibre bundle moment of torsion.

The tubular intracavity that makes hot-air pass through heater can heat supplementary function to microwave or radio frequency, and purpose is to take away the moisture content of evaporation.

Other aspects of all novelties that should consider of the present invention can be understood from the description of carrying out below in conjunction with embodiment.

Brief description of drawings

Below with embodiment and describe the present invention with reference to the accompanying drawings, in the accompanying drawings:

Fig. 1 illustrates the relation of the glass transition temperature and the water content of wool;

Fig. 2 illustrates and forms false twisting and the equipment that turns to traction is provided simultaneously;

Fig. 3 illustrates the spinning jenny of rope making industry, and it has embodied the deflection sheave device similar to Fig. 2;

Fig. 3 a is tape condenser and pincers cutter;

Fig. 3 b illustrates the direction of rotation of hauling capstan;

Fig. 4 illustrates the relation between reducing of drawing of fiber bundle regain, diameter micron and the curling curvature;

Fig. 5 illustrates total layout viewing of stretcher of the present invention.

The heating means of prior art are included in the atmosphere that fibre bundle forms steam on every side, as described in PCTWO91/0283. Make being in tension state and being in thus the fibre bundle core heating of compact shape attitude of being twisted, this just needs the much longer time. The caloric requirement that is applied to such fibre bundle surface is diffused into core for a long time. Therefore, can adopt microwave or radio heater, in the radius of fibre bundle of twisting and whole radius form the environment that can reach a high temperature, or even surpass 100 ℃, its water content can be from it value during initial or input alter a great deal. Deep experimental studies results is found, regain 19-25%, and preferred 20-23% just are enough to the wool fiber bundle is carried out high elongation 40-60% safely, and regain is reduced to 10-15%, and preferred 12-14% just is enough to realize temporary set.

The invention provides a kind of like this method, it can change in regain only is under the 7-10% situation, realizes stretching and temporary set, and this consumption of energy is minimum.

Be not subjected to any concrete theory, can think, the obvious transient heat plasticity of this under specified criteria in the wool can be described below:

The larger second order trnasition of plasticity from from glassy rigid state to easier motion can occur in wool as the most polymer solid, this transformation has temperature and moisture content dependence. When temperature raises when being called the temperature of glass transition temperature, the transformation from the rigidity attitude to the plasticity attitude just occurs. In wool, glass transition temperature has very high moisture content dependence, and when the regain of wool fiber is high, glass transition temperature is just lower, and when the fiber regain is low, it is just obviously higher. (seeing Fig. 1). By such wool fiber is provided in the set-stretching process, the easily plasticity attitude feature of motion of the fiber that the regain that it has is larger than described temperature lower-glass transformation border, just can utilize the condition of palsticity, in order to do not needing to realize stretching under the excessive stresses situation, and under the tensile fiber state, carry out drying and realize temporary set, until its regain reaches drying one side of glass transition curve.

Of the present invention another and preferred aspect, under moderate regain 19-25%, just can realize the plasticity attitude that is easy to move, mode be under this regain the raising fiber temperature to more than the glass transition temperature. Most heating means are to reduce regain by evaporation, and this just increases glass transition temperature. Microwave or radio frequency heating can make temperature in the intensive false twisting fibre bundle just very fast and raise fatefully before a large amount of evaporations and dry the generation. So just formed, the wool fiber bundle of moderate regain is endowed plasticity, thereby can carry out a kind of Instantaneous State of high elongation. At the another kind of only known method of realizing this plasticity attitude in the intensive twisted fibers bundle under the tension force that is in of so low regain, be that intensive twisted fibers bundle is remained in the steam for a long time. The present invention is by using microwave or radio frequency heating, just can the same state of very fast realization, and do not need to apply steam from the outside.

The present invention can make the wool fiber bundle with substantially straight passage by it to plastify, stretch, part is dry, the whole zone of cooling and temporary set, need not pass through pulley or guiding device. This straight channels has three advantages:

1. it is conducive to make fibre bundle by comprising the line style heating clamber of microwave or rf electric field, can not exist owing to the problem that has pulley or guiding device to occur in the highfield.

2. be heated when reaching maximum plasticity or minimum tension modulus when fibre bundle, it provides the stretching position along fibre bundle automatically in Best Point or short zone. Because the fibre bundle heating is very fast, so very large along the thermograde of fibre bundle, the position that occurs to stretch is static (be that it can in advance and not retreat a lot, otherwise can cause inhomogeneous setting) basically.

It automatically in the set-stretching district along fibre bundle have a few moment of torsion all be provided etc. Therefore, when fibre bundle stretches and attenuates, twist with the fingers (being false twisting) just redistribution, make the drawing of fiber bundle that attenuates accept the sth. made by twisting of Duoing than previous not drawing of fiber bundle part. By such mode, when fibre bundle stretches, just do not need any optional equipment to regulate the twist, for example PCTWO91/02835 is described.

An exemplary embodiment of the inventive method is described below.

The step of the method for the invention is as described below:

1. the fibre bundle of a branch of wool or other animal origins is provided, and the continuous tow of its similar twist-free rope, line density are generally 28-60 gram/rice. They can be fibre bundle or the fibre bundle of combing and grilling or the fibre bundle of combing of combing.

With fibre bundle by being supplied with the double-wall pipe of live steam (being the saturated vapor under the atmospheric pressure), thereby the regain of fibre bundle is adjusted to desired scope 19-25%, but preferred 20-23%. This double-wall pipe also can be used to preheat fibre bundle. In addition, fibre bundle can preconditioning in atmosphere (seasoning), and this also can reach same regain. After regulating regain, fibre bundle is just by a pair of speed supply of feeding roller (roll) to control that also is used as the twisting piece.

3. to fibre bundle twisting, the twist should be enough to prevent drawing-off (being each other slippage of adjacent fiber). Prevent that the desired twist of drawing-off from can illustrate with twist factor, twist factor is the parameter that usually is used for representing the twist in textile industry. Twist factor is defined as the square root that every meter upper number of turns of twisting with the fingers multiply by fibre bundle line density (grams on per 1000 meters). The twist factor of 2000-3000 just enough prevents drawing-off, and the lower limit of this scope is suitable to long fibre, and the upper limit is suitable to short fiber. The method is not limited to the scope of the twist factor that embodiment provides. Twisting of the invention process is not the permanent twist, but temporary. Fibre bundle only is in the twisting state during by the processing district in height tensioning situation, when leaving this district with regard to backtwisting. Of the invention process in textile fiber tow the temporary transient twist that exist and that exist during by the processing district in by textile industry, be called false twisting, although the described twist is real, be temporary transient.

4. in described method, be that the fibre bundle that will be in the twisting state stretches to it in same district. For wanting temporary set also not use the pretreated fibre bundle of reducing agent, extensibility is generally 40-60%.

5. realize the traction that fibre bundle stretches and prevent that fiber is in the twisting of drawing process drawing-off, both provided by the angle pulley flier that is widely used type in rope, cord fabric thread, hard fibre and the bast fiber industry, D Himmelfarb, The Technology of Cordage Fibres and Rope, Leonard Hill (Books) Ltd, London, 1957, fig.12 and pp 127-147; And A V Pringle, The Mechanics of Flax Spinning, H R CarterPuhlocations Ltd, Belfast, 1954.

In these industry, it is " truly " or the permanent twist that the twisting of enforcement requires usually. With respect to fibre bundle axle (seeing Fig. 3) rotation collection package (normally large bobbin), just can realize. In the present invention, added sth. made by twisting does not require it is " really " or permanent, but preferably " vacation " or temporary transient, so the collection package of angle pulley flier back does not just rotate with respect to the fibre bundle axle. A kind of example of improved angle pulley flier as shown in Figure 2. In Fig. 2, the equipment that forms false twisting is comprised of the framework E with capstan winch B and pulley C, and pulley C changes the direction of fibre bundle only as guide, and framework is around center line x-y rotation (motion). In use, the fibre bundle that moves along direction shown in the arrow has false twisting at the A place, and is substantially non-twist at the D place. Capstan winch B circumferentially has groove, as guiding roller or pulley C. Capstan winch B also rotates around the axle of himself, in order to traction is provided. This is applicable to well-known equipment in the known category.

6. another key character of the inventive method and equipment, only to need single angle pulley flier unit, this has just shortened and the bundle time, and this angle pulley flier unit is positioned at drawing zone and dry section back, so that the fibre bundle passage is straight shape substantially from feeding roller to flier. In this straight shape district, individual line style microwave or radio heater are arranged, but preferred microwave applicator, when fibre bundle passes through this district and the described heater of process, very fast heating, plasticizing stretches, and is then progressively dry. Microwave (or radio frequency) heater is the heating of only usefulness basically and follows the dry energy. The auxiliary a small amount of warm air-flow tubular intracavity by microwave device is provided, drive away the steam of evaporation, otherwise described moisture content can finally be full of inner chamber.

7. when fibre bundle is twisted and is stretched, input heat and thermal fiber Shu Suihou pass through at least air of 2-3 rice in microwave field, then by the angle pulley flier progressively drying effect that very fast rotation produces in air of rotation, regain can be reduced to is enough to realize temporary set. The rotation of the cooling in air zone and angle pulley place air helps the effect that formalizes. Test shows, if regain less than 15%, preferred 12-14% just can realize temporary set.

8. in this industry, collect fibre bundle in the known conventional can coiler. This can coiler still can not apply excessive tension force to it, otherwise can produce irregular drawing-off just to be enough to collect the speed control running of the fibre bundle that is transferred. In addition, the fibre bundle that stretches also can the bobbin in being installed on the angle pulley flier be gathered into twisting form (namely having the true twist) and (namely uses flier with the mode of being familiar with in the manufacturing industry of restricting, as shown in Figure 3, wherein 8 is chain bands, the 9th, condenser and pincers cutter, the 10th, twist pulley, the 11st, hauling capstan, the 12nd, the flier sprocket wheel, the 13rd, tension roller), if use this way, just needs step subsequently is with the fibre bundle backtwisting, make it carry out next step textile process, this processing may be grilling or shredding and combing operation.

Fig. 5 illustrates arranging of an example part of stretcher. In this example, mass of fibers 7 is sent to presteaming machine 2 to compression roller 3 from creel 1. Then fibre bundle 7 passes through microwave dryer 4 to angle pulley flier 5 with the false twisting state. Then fibre bundle with any suitable gathering-device for example can coiler 6 collect.

Permanent set stretches

The Another application of the method and apparatus that the present invention discloses is to provide with electronation processing preplasticizing known in this industry so that the fibre bundle that obtains to formalize more for set-stretching equipment.Increase the distance between microwave or radio heater and the angle pulley flier, perhaps also center on fibre bundle, just can obtain the degree of setting that further improves with steam.By oxidative work-up (for example adopting the hydrogenperoxide steam generator that is used for this purposes known in this industry), or, just can obtain the degree of setting or the tensile property that further improve by crosslinking Treatment (for example adopting the formaldehyde that is used for this purposes known in this industry).

The exemplary embodiment that the present invention prepares the method for permanent elongation fiber is described below.The step of a method of the present invention can be as follows:

(a), for example under following optimum condition, handle wool or animal fiber bundle or wool top with chemical reducing agent sodium metasulfite solution for example:

-sodium metasulfite 10-30g/l

-temperature 80-85 ℃

-time 1.5-10 minute

-pH5-7.5

The metabisulfite that concentration is bigger matches with the short period and opposite cooperation;

(b) adopt compression roller that the regain of fibre bundle is reduced to 45-60%;

(c) the step 3-6 of basic as above-mentioned method stretches to fibre bundle and to realize that temporary set stretches, but with above-mentioned important different be that stretching or the elongation that is applied on the fibre bundle generally is (but not necessarily must be) 60-90%.

(d) according to following general parameters, select the microwave energy of input so that after fibre bundle or wool top leave drawing zone its regain of control, purpose is to select the curling curvature in the processing fiber bundle and the minimizing of diameter:

I. change for the curling curvature of minimum and maximum diameter, adopt minimum fibre bundle regain, the fibre bundle of handling with the 10g/l metabisulfite generally is lower than 10%, generally is lower than 20% with what the 20g/l metabisulfite was handled;

Ii. the diameter for the curling curvature of maximum and minimum (or even zero) changes, and adopts high fibre bundle regain, is generally 30-60% when being no more than the preliminary treatment of 15g/l metabisulfite;

Iii. be the 90-100% that changes of maximum gauge and the natural wool curling curvature that diameter generally presents that is stretched for changing near maximum diameter, when handling fibre bundle with the 10-15g/l metabisulfite, the fibre bundle regain of employing is 20-40%.

Change the general parameters of degree from curl curvature and diameter of the above-mentioned control of Curve selection shown in Figure 4, described curve shows in fibre bundle regain scope to the effect of stretching wool.Importantly these regain values are the regains when leaving drawing zone.

With not limiting embodiments of the invention embodiments of the present invention are described below.

Embodiment 1

85 ℃ with a branch of 28.6 microns wool of 10% sodium metasulfite solution-treated, then when it enters drawing zone, in roll, push, make regain be reduced to about 60%.It is stretched 65%, when its during through tubulose microwave oven, dry simultaneously, make its regain when drawing zone comes out be about 8%.The diameter and the curling curvature of the lax back of decatize fiber are as follows with the result that OFDA method (fibre diameter analyzer, IWTO method of testing 47) records.Fibre length (Almeter method) and yellowness (Y-Z) have also been provided below.

	Diameter (micron)	Curvature (°/mm)	Fibre length (Pasteur's length m m)	Yellowness (Y-Z)
					Be untreated	28.6	66	97	5.8
Stretch	24.2	29	118	3.2

Stretched fiber is thinner, has less curling curvature, long fibre length and less yellowness (color that is it is whiter).

Embodiment 2

At the same fibre bundle of describing in embodiment 1 with the metabisulfite preliminary treatment under the same condition.Push under the condition identical with embodiment 1 and stretch, importantly difference is, the microwave power of supply is less, makes the regain of fibre bundle after leaving drawing zone be about 35%.After the fibre bundle decatize was lax, fibre diameter, curling curvature, fibre length and yellowness were as follows.

	Diameter (micron)	Curvature (°/mm)	Fibre length (Pasteur's length m m)	Yellowness (Y-Z)
					Be untreated	28.6	66	97	5.8
Stretch	24.9	82	104	3.0

Stretched fiber (compare though reduce 15% with the diameter of embodiment 1, only reduced 13%) curl curvature and the fibre length that attenuate increases, and yellowness reduces.

Because the present invention is the method and apparatus of stretching wool, clearly, permanent set known in this drawing process and the textile industry handled combining, just can make this industry from the inventive method, obtain benefit, with the drawing of fiber that above-mentioned permanent set is provided and the drawing of fiber of temporary set.

Therefore, the present invention can provide the method and apparatus of the fibre bundle of stretching wool or animal fiber, it can be advantageously used in the temporary set drawing of fiber that preparation has potential highly shrinkable, also can be used to prepare diameter reduction, length growth and the improved permanent set drawing of fiber of the curvature of curling sharply.

Describe specific embodiments of the invention above, can see, do not broken away from the scope of appended claims of the present invention, can carry out some improvement and change.

Claims (17)

1. the method for a drawing of fiber bundle, it comprises the steps:

-fibre bundle is along the stretched district of fibre bundle passage;

-fibre bundle produces false twisting in drawing zone;

-by applying tension force, at drawing zone in-draw fibre bundle to fibre bundle;

It is characterized in that: described fibre bundle passage is the straight beeline channel that passes through drawing zone between a feeding roller and a single angle pulley unit, and false twisting is produced by the angle pulley unit, and unrestricted and freely propagate along fibre bundle in drawing zone;

Its feature also is: this method is included in the interior microwave field heating fiber bundle that adopts of at least a portion of drawing zone.

2. the method for claim 1 is characterized in that the false twisting in the described drawing zone distributes automatically in drawing zone, and making has constant moment of torsion along fibre bundle, and the thin part that therefore stretches at fibre bundle has the needed big twist (number of turns/rice).

3. method as claimed in claim 1 or 2 is characterized in that making fibre bundle to pass through the microwave field of drier effect, realizes the Fast Heating and the drying of intensive fibre bundle.

4. method as claimed in claim 3 is characterized in that described microwave field is limited in the waveguide.

5. method as claimed in claim 3 is characterized in that not having under pulley or the guiding device situation, and the straight channels of fibre bundle can make fibre bundle pass through microwave field easily.

6. method as claimed in claim 3, it is characterized in that making the steam pipe that will under extended state, be positioned at the feeding roller front by the fibre bundle of temporary set process, it is carried out the plasticizing of less degree, this makes the temperature of fibre bundle be increased to 100 ℃, make the fibre bundle regain increase at least 19%, and in described method, the fibre bundle regain obviously is reduced to less than 14% with microwave dryer.

7. method as claimed in claim 6 is characterized in that described fibre bundle adopts the change of 7-10% regain to carry out temporary set.

8. method as claimed in claim 1 or 2, the setting that it is characterized in that offering the fibre bundle fiber is temporary set.

9. the method for claim 1, the setting that it is characterized in that offering the fibre bundle fiber is a permanent set.

10. method as claimed in claim 9 is characterized in that obtaining bigger permanent set by make fiber generation electronation before stretching.

11. as claim 9 or 10 described methods, it is characterized in that perhaps using steam atmosphere around fibre bundle, obtain bigger permanent set by increasing the distance between microwave dryer and the angle pulley flier.

12. method as claimed in claim 11 is characterized in that further increasing degree of setting by oxidative work-up or crosslinking Treatment.

13. the equipment of a continuously elongated fibre bundle, it comprises:

-in drawing zone, add false twisting and in drawing zone, apply the single angle pulley unit of tensile stress to fibre bundle to fibre bundle;

-the microwave dryer of heating fiber bundle at least a portion of drawing zone; And

-feeding roller, the fibre bundle straight channels by drawing zone is determined in this feeding roller and angle pulley unit.

14. equipment as claimed in claim 13 is characterized in that described single angle pulley unit is suitable for making fibre bundle to leave the angle pulley unit along rotating shaft, it is positioned at the downstream of drawing zone.

15., it is characterized in that between microwave dryer outlet and angle pulley unit, the air zone of 2-3 rice at least being arranged as claim 13 or 14 described equipment.

16., it is characterized in that described fibre bundle passage does not have pulley and roller in drawing zone and between drawing zone and the angle pulley unit as claim 13 or 14 described equipment.

17. the described equipment of the method for claim 1 or claim 13, wherein said fibre bundle are the fibre bundles of wool or other animal fibers.

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