CN1347384A - Process for winding elastomeric fiber package - Google Patents

Abstract

A winding process for an elastomeric fiber package, utilizing a contact roll exerting a diminishing force according to a specific profile on a tube core and on the growing package after winding begins, is provided.

Description

The process of winding elastomeric fiber package

The background of invention

Invention field

The present invention relates to a kind of winding process that is used for elastomeric fiber package, especially relate to a kind of process of using the contact cylinder when reeling, to apply the pressure coiling package of variation.

Background technology

In a lot of fields, as industrial materials, cloth and disposable personal hygiene article (as diaper) have been extensive use of the product based on elastic fibre.Elastic fibre has been weaved and has been knitted into fabric, and loop bonding is bonded into non-woven fabric and directly bonds on the pure material as non-woven fabric and film.The elastic fibre that initially provides is to be wound on the tube core.The fiber of this coiling and the tube core that is associated are called " package ".In use, elastic fibre is order or unwinding abreast from this package, and (for example) perhaps passively by " terminal line taking ", (for example, by " rolling line taking ") is fed to downstream process perhaps on one's own initiative.

But produced some problem, so far elastomeric fiber package some the time very poor package shape arranged.Such package is with the contact cylinder continuous increase of the power of tube core and package to be reeled.This very poor package shape is easy to cause that elastic fibre is from this package come off (for example because friction shipment material or other elastomeric fiber packages), thereby the elastic fibre mat that makes the elastic fibre that does not have unwinding become and come off causes fibre breakage.Such fracture also can take place in the direct result as friction.Therefore, do not have the economic benefit of fiber of such package unwinding relatively poor, and need a kind of improved process that is used for winding elastomeric fiber package.

Brief summary of the invention

A kind of be used to reel produce the method for the elastic fibre that bending force distributes, it comprises following each step:

(A) rotate the tube core that touches with the contact roller socket joint;

(B) fiber is wound up on the tube core, thereby makes the contact cylinder apply starting force and make package begin to form the fiber on the tube core;

(C) for the first time this power is reduced to gradually about 25-60% of starting force during 30% at first of the time of reeling;

(D) keep this power constant substantially up to last 30% of the time of reeling; With

(E) this power is reduced to is not less than about 10% of starting force the second time.

Description of drawings

Fig. 1 is the diagrammatic side view of explanation by the elastomeric fiber package of process acquisition of the present invention;

Fig. 2 be in process of the present invention from beginning of reeling to the diagram of curves of the end contact cylinder of reeling to the relative roll diameter of the added power of tube core and package, this is the example that bending force distributes;

Fig. 3 represents the drawing in side sectional elevation with the elastomeric fiber package of the conventional production of reeling;

The example that the no bending force that Fig. 4 explanation is used in conventional winding process distributes.

Fig. 5 schematically illustrates the example of a kind of device that can be used for this process, and the power that it makes the contact cylinder be applied to elastomeric fiber package changes.

The specific embodiment

Now having been found that can be by producing the elastomeric fiber package that good unwinding feature and good package shape are arranged, particularly big package with the package of bending force distribution coiling.

" elastic fibre " refers to its breaking extension and surpasses 100% and curl irrelevant and in elongation be returned to the silk of its basic original length after unclamping very soon and forcibly with any.Such fiber comprises IR fiber, Spandex (Spandex) or elastic fibre (elastane), polyether ester fibre, polyetheramides fiber, some polypropylene and elastic polyester." Spandex " and " elastane " refers to the fiber of manufacturing, and wherein, the material that forms fiber is the synthetic elastomer of long-chain, and this elastic body comprises the segmentation polyurethane of at least 85% weight ratio." crooked power distribute " meaning is meant that roll diameter contacts the diagram of curves of power that cylinder imposes on the package of tube core and coiling relatively, and this diagram of curves has from being recessed to protruding or opposite curvature change according to the point of observation to curve with respect to fixing straight line.

Synthetic elastic fibre can prepare from carbowax as elastic fibre (elastane), polyetheramides fiber and polyether ester fibre; Also can use the copolymerization ethylene glycol.In the situation of elastic fibre, carbowax can be (being total to) polyethers ethylene glycol, (being total to) polyester glycol and/or (being total to) polycarbonate ethylene glycol.Generally there is a diamines in carbowax at least, forms poly-mer with the diisocyanate reaction under the condition of alkanolamine and/or glycol.In the situation of polyether ester, the polyethers ethylene glycol forms poly-mer with diacid reactant under the condition that has a low molecular weight diols at least.Can use polyether diamine, diacid and low-molecular-weight diamines prepare polyetheramides.Can use unifunctional chain terminating agent such as second alkohol and amine to control the mol wt of poly-mer.

According to the type of the poly-mer that will make, can use solution or melt polymerization.Therefore, the type that depends on poly-mer can be used dried, wet or melt-spun prepares fiber.Additive and stabilizer on can adding in fiber all can use as long as they can not produce adverse influence to process of the present invention.

After spinning fiber, fiber makes it make traverse motion and be wound up on the tube core by traverse gear on its service direction usually.Tube core is installed on the spindle arrangement by convention, with the contact cylinder fiber is wound up on the tube core.Can drive spindle arrangement and not drive contact cylinder (freely rotating).Another kind is can not drive spindle arrangement and drive the contact cylinder, and rotating drive need be provided like this, so that spindle arrangement is rotated.

In process of the present invention, affacting the power that (with after the beginning of reeling, affacts in the package of increase) on the tube core by the contact cylinder is to reduce according to special distribution when reeling.Reducing of power described herein is that reference volume gets around employed power (" starting force ") when beginning.Maximum starting force can be 10kg, and minimum power can be 1kg.The time of reeling first 30%, preferably for the first time power is reduced to gradually about 25-60% of starting force during 10%.Contact cylinder power remains unchanged then substantially, and last 30% up to the time of coiling preferably about 20% o'clock, is reduced to this power for the second time and is no less than the about 10% of starting force, preferably about 10-35%.The coiling time, the curve of making the diameter of the relative package of contact cylinder power obtained distributing as bending force illustrated in fig. 2 approx corresponding to roll diameter.

Method of the present invention provides a kind of elastomeric fiber package, and it has basic coiling width uniformly, thereby good unwinding and shape retention properties is provided.That is to say that the present invention produces package as shown in fig. 1, it has little deviation δ between the minimum and maximum value δ minimum of package width maxim δ of coiling _ωLittle deviation S _ωShow that each sidewall is essentially required flat, and perpendicular to the axis of tube core; Such package has good unwinding feature.

Process of the present invention is very useful to weight at 3kg or elastomeric fiber package above even that surpass 4kg.

In this invention, can use any suitable method, as contacting cylinder to the package applied force with changing with a kind of device control.For example, can use as equipment illustrated in fig. 5, the signal operation that compressed-air actuated cylinder 5 comes according to the control setup (not shown) in this equipment, to adjust the weight of the arm 4 of supporting contact cylinder 3, this contact cylinder contacts rotation with tube core with package 1 when winding elastomeric fiber 2.Contact cylinder power reduces and this power increase when cylinder shrinks when cylinder stretches like this.Air cylinder also available hydraulic cylinder replaces.Also can use other geometry and distribute so that obtain the power of bending of the present invention.

Example 1

Device dry-spinning 560 daniers (622 dtex) Lycra by routine ^Spandex (model 127, the registered trade mark (RTM) of E.I.du Pont de Nemours and Campany (E.I.Du Pont Company)) also is wound up on the long tube core of 175mm, is 4.5kg so that reach weight of package.Fiber is not applied refine.At winding process contact cylinder the bending force shown in the package applied force adjoint 2 is distributed, with roll diameter (mm meter) drawing on the abscissa and the contact cylinder charts on ordinate to package applied force (kg meter).As shown in Figure 2.Total roll diameter is about 282mm.Be about 9mm (5% and the time of always reeling of overall diameter about 5%) when when reeling beginning, reducing for the first time to contact cylinder power, and be about 46mm (24% and the time of always reeling of overall diameter about 24%) when when reeling end, reducing power for the second time.About 5.7kg when power begins from reeling is reduced to the about 2.9kg in the middle of reeling, and perhaps is reduced to about 50% of starting force.Contact cylinder power remains unchanged substantially and finishes up to reeling, and further is reduced to about 31% of starting force in end this point power.In other words about 1.8kg.As shown in table 1, the coiling stand out is very little to have good sidewall shape and unwinding feature with product.

Comparison example 1

Just the same to elastic fibre weaving and coiling and example 1, except the contact cylinder increases as routine is reeled the package applied force, such as shown in Figure 4.As listed in the table 1, the coiling width of the package that obtains is represented relatively poor unwinding feature greater than the width of the package of example 1, and the sidewall that S type (basic epirelief drum) arranged as shown in Figure 3.

Table 1

	Example 1	Comparative example 1
			The contact cylinder is applied to the curve shape of the power in the package	Crooked power distributes, as shown in Fig. 2	Linearity, as shown in Figure 4
Coiling stand out δ ω(mm)	????16	30
			Sidewall shape	Smooth curve	The S type has big protruding drum
The unwinding feature	Very	Difference

Claims (6)

1. one kind is used to reel and produces the process of the elastic fibre that crooked power distributes, and it comprises following each step:

(A) rotate the tube core that touches with the contact roller socket joint;

(B) fiber is wound up on the tube core, thereby makes the contact cylinder apply starting force and make package begin to form the fiber on the tube core;

(C) for the first time this power is reduced to gradually about 25-60% of starting force during 30% at first of the time of reeling;

(D) keep this power constant substantially up to last 30% of the time of reeling; With

(E) this power is reduced to is not less than about 10% of starting force the second time.

2. process as claimed in claim 1 wherein, is reduced to the 10-35% that is about starting force with power for the second time.

3. process as claimed in claim 1, wherein, starting force is not more than about 10kg and final power is not less than about 1kg.

4. process as claimed in claim 3, wherein, first of the time of reeling reduce for the first time during 10% the power and the time of coiling last 20% during reduce this power for the second time.

5. process as claimed in claim 2, wherein, fiber is to select from comprise Spandex and polyether ester fibre one group and the package size is at least about 3kg.

6. process as claimed in claim 3, wherein, fiber is that Spandex or polyether ester fibre and package size are greater than about 4kg.

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