CN103649388A

CN103649388A - Regenerated cellulose fiber

Info

Publication number: CN103649388A
Application number: CN201280035135.0A
Authority: CN
Inventors: I.伯恩特; M.诺思; R.雷特恩巴彻尔; W.罗根斯泰恩; R.肖尔兹
Original assignee: Kelheim Fibres GmbH
Current assignee: Kelheim Fibres GmbH
Priority date: 2011-07-15
Filing date: 2012-06-26
Publication date: 2014-03-19
Also published as: BR112014000826A2; CA2839234A1; KR20140037209A; EP2546395A1; WO2013010761A1; US20140147616A1; AU2012286157A1; JP2014524987A; EP2732082A1

Abstract

The invention relates to a regenerated cellulose fiber (1"), the cross-section of which has a substantially flat elongated section (3). The fiber according to the invention is characterized in that at least one limb (4, 5, 6, 7) branches off from the elongated section, the length of said limb being maximally 40% of the length of the elongated section (3).

Description

The cellulose fibre of regeneration

Technical field

The present invention relates to a kind of cellulose fibre of the regeneration obtaining by viscose process (Viskoseverfahren).

Background technology

For hygiene applications for example common tampon (Tampons) or absorber, in order to realize the high as far as possible absorbability of health product, with the fiber of extra high fluid storage ability, be to be worth expectation.

The fibrous material according to prior art that is generally used for manufacturing tampon is viscose and the cotton of common viscose (Viskosefaser), so-called trilobal.According to the so-called Syngina-test of below continue describing, the absorptance capacity of these fibers is, for the about 4.0g/g of cotton, for common viscose (Viskose) 4.5g/g and for the viscose 5.2g/g of trilobal.

The target of the manufacturer of tampon is, with minimized fibrous material consumption and cost, realizes certain trap.

As the fibrous material for tampon, cotton is because its inadequate absorbability is no longer used at leisure, and the fiber of trilobal is compared more expensive at manufacture view and is more difficult to be processed into tampon with common viscose.

Announced multiple different from improving the scheme of the absorbability of cellulose fibre:

1. by monomer is carried out to chemical modification in conjunction with (Aufpfropfen) to cellulose fibre

2. by the condensate that plays absorption is for example carried out to chemical modification in carboxymethyl cellulose, shitosan, cellulose carbamate, alginates (Alginat) or galactomannans introducing cellulose fiber substrate

3. the physics of fiber changes, and for example (zusammengefallen) hollow fibre of hollow fibre or avalanche, for example known from document US-A 4,129,679, or

4. the dry fiber (so-called " trilobal " fiber) of racemosus, it is by using the spinning-nozzle with the dry extrusion cavities of racemosus (its limb that is 2:1 to 2:10 with at least 3 length-width ratios) to obtain, for example known from document EP-A1 0 301 874.

The shortcoming of the chemical modification of cellulose fibre is, for for example application of tampon of highstrung medical application, the toxicology and the physiological test method that need expensive and time-consuming, and the appearance of toxic shock syndrome (TSS) makes most tampon manufacturer stop using the fibrous material of chemical modification, although that chemical reagent may be regarded as is safe.

The shortcoming of hollow fibre and broken hollow fibre is, it is because its high moisture holding capacity is difficult to manufacture, fiber expands very doughtily and because the formation of hydrogen bond is during drying bonded to each other during cleaning thus, and this makes it in dry state, become frangible, satiny and be difficult to make its division and be processed into by the fabric of combing in wet state.

In recent years, use more and more all the time the fiber of the dry trilobal in particular of racemosus.

For example, at american documentation literature 5,634,914 and 5,458,835 and the manufacture of having described the dry viscose of racemosus in document EP-A1 0 301 874.Method disclosed herein has described that the extrusion cavities of the shape of trilobal is by normally used viscose spray silk (Spinnen) in traditional spinning bath in particular by having the dry shape of racemosus, and this viscose can have a certain amount of modifier known in the prior art.The key character of the method is, the dry shape of extrusion cavities and the shape of cross section of filamentary expectation of racemosus in spinning-nozzle is similar.According to the instruction of these documents, the geometry in spinning-nozzle hole is determined the shape of fiber cross section, and by correspondingly designing extrusion cavities, can obtain certain length-width ratio of fiber cross section.

The prior art of the fiber aspect that this external racemosus is dry provides such instruction, be that the dry fiber of such racemosus is with respect to have the absorbent properties of raising according to the viscose of prior art, particularly in particular aspect tampon, and this fiber each limb must with at least 3 limbs and this fiber must have at least 2:1, the length-width ratio of 3:1 to 5:1 most preferably.Length-width ratio is larger, and the share absorbability larger and fiber of free volume is higher, and its prerequisite is that limb can so not grown and carefully make it be bent back to it oneself.

In these documents, also set forth, under the spinning condition of regenerating slowly, even also can realize the higher absorbability of the dry fiber of racemosus, for example, by reducing sour water, put down and/or improve sulfate level and/or add viscose silk modifier.

In addition, from document US-A 4,362,159, known cavity in the cross section of viscose improves this fiber and the fact of the absorbability of the product made by it.

The standard viscose of known a kind of solid regeneration from document WO 2004/085720 A, it has such cross section, be the area of receiving the maximum equilateral triangle in cross section in its area is less than 2.5 times preferably less than 2.4 times especially preferably less than 2.25 times, and this standard viscose has the Syngina absorbability that is greater than 6.0g/g fiber of following restriction.

A kind of standard viscose that has absorption affinity with irregular leaf cross section has been described from document WO 2004/005595 A.In document US 4,129,679 and GB-A 1,333,047, other viscose with irregular cross section has been described.

Document US 6,403,217 Bl have described for the different spray nozzles structure with the fiber of the fiber cross section of revising according to melt-spinning process manufacture.Melt-spinning process is substantially different from the wet spinning technology using in viscose process.

For example from document EP 0 301 874 A, the fiber of known traditional trilobal has high absorbability.This is attributable to the high rigidity being caused by its geometry on the one hand, and this rigidity has improved by the stability in the fibroplastic hole of trilobal and made thus to store large amount of liquid becomes possibility.On the other hand, Y-shaped structure also affects the packing density of fiber.The structure requiring by its space arrangement aspect, the ratio that automatically produces larger cavity when thering is the circular fiber of same structure in use.

By thick pore structure, relatively little in the capillarity from Y shape fiber well known in the prior art.For with absorbed power faster and the better absorber of distribution effect, forms larger quantity still for this reason more the cavity of small size be favourable.

Summary of the invention

In order to overcome the above-mentioned shortcoming of known absorbefacient viscose, according to the cellulose fibre that the invention provides a kind of regeneration, that its cross section has is microscler, flat (flach) section substantially, and it is characterized in that, from this microscler section, branch out at least one limb, the length of this limb is the maximum 40% of the length of microscler section.

Object of the present invention is also contained a plurality of fibre bundles according to cellulose fibre of the present invention and is realized by a kind of.

Other side of the present invention relates to a kind of for the manufacture of according to the method for cellulose fibre of the present invention and a kind of according to cellulose fibre of the present invention and according to the purposes of cellulose bundle of the present invention.

Accompanying drawing explanation

Fig. 1 has shown two for example attached schemes (Anlagerung) of the cellulose fibre of known trilobal from document EP 0 301 874,

Fig. 2 has shown the attached scheme with a plurality of fibers of flat cross section,

Fig. 3 has shown the cross section according to fiber of the present invention,

Fig. 4 has shown a plurality of according to the attached scheme of fiber of the present invention,

Fig. 5 has shown that the water causing by fiber according to the present invention keeps.

The specific embodiment

Have been found that for its cross section, having substantially flat microscler section and the cellulose fibre of at least one limb stretching out from this section and the fiber of trilobal compares the hole size that can advantageously affect the product of being made by a plurality of this fibers.

Preferably, limb is arranged to substantially meet at right angles with respect to microscler section.

Such form of implementation is especially preferred, and the limb of a plurality of branches is set therein.

At this, limb can be advantageously on both direction, from microscler section, branch is out.

Equally preferably, the total length of the limb of branch is no more than the length of microscler section.

At least a portion in limb, preferably all limbs can have the length-width ratio of 2:1 to 10:1.

At least a portion in limb, preferably all limbs can have the width less than the width of flat section.

Preferably, the whole bending of flat section is 120 ° to the maximum.Even also can obtain certain bending in the flat fiber obtaining (exactly at flat section arranged according to the present invention) when the nozzle of the spinneret orifice by with flat carries out spinning.At this, bending is regarded as such angle, and it limits through the imagination straight line of end points point farthest by the end points of flat section and the distance of flat section.

According to the fibre number of fiber of the present invention, can be 1.3dtex to 10dtex.

According to cellulose fibre of the present invention can staple (Stapelfaser), cut off the form of staple fibre (Kurzschnittfaser) or exist as tow (Filamentkabel).

The present invention also relates to a kind of fibre bundle, the cellulose fibre that its racemosus that comprises a plurality of regeneration is dry, wherein, at least 10%, preferably at least 20%, especially preferably at least 50% of the dry cellulose fibre of this racemosus with the form according to cellulose fibre of the present invention, exist.In fibre bundle according to the present invention, substantially all in the racemosus dry cellulosic fiber comprising also can exist according to the form of cellulose fibre of the present invention.

" fibre bundle " is interpreted as a plurality of fibers, i.e. for example viscose staple fibre (Zellwolle is sometimes referred to as staple fiber) (a plurality of staple), endless filament yarn (Endlosfilament) strand or fibroplastic bundle.

Preferably, substantially all in the dry cellulose fibre of the racemosus that comprises in fibre bundle all exist with the form according to cellulose fibre of the present invention, and exactly, the cross section of the cellulose fibre that the racemosus that comprises in fibre bundle is dry is identical substantially.

This fibre bundle can comprise other fiber, and the dry cellulose fibre of non-racemosus for example has but also can comprise the fiber that the fiber in other source is for example made by other condensate.

According to of the present invention for the manufacture of comprising the following steps according to the method for the cellulose fibre of the regeneration described in any one in the claims or fibre bundle:

-rayon spinning material (Viskosespinnmasse is sometimes referred to as rayon spinning stoste) is provided,

-by least one hole of spinning-nozzle, rayon spinning material is sprayed in the situation that forming strand (Spinnfaden) to silk in spinning bath,

And, it is characterized in that, the hole of spinning-nozzle has the section of flute profile, Cong Gai section branch is at least one limb out, the length of this limb be to the maximum flute profile section length 40%.

Alternatively, the method according to this invention can comprise the fiber of making by means of described method and other fiber traditional dry fiber of racemosus, dry fiber of non-racemosus and/or have the step that fiber that the fiber in other source for example made by other condensate mixes for example.

Preferably, in the less angle between limb and the section of flute profile between 30 ° to 90 °, especially preferably between 60 ° to 90 °.

The method according to this invention is design as follows preferably, that is, spinning-nozzle has a plurality of holes, wherein, porosely all there is substantially the same shape.Thus, for example, in fibrous fibre bundle according to the present invention, realizing especially preferred design, all fibres has substantially the same cross section.

The present invention also relates to according to regenerated celulose fibre of the present invention or fibre bundle according to the present invention at the product that plays absorption, amenities is tampon in particular, incontinent patients articles for use (Inkontinenzprodukt), panty liner and sanitary napkin, for sheet, the packing material of cushion and sleeping bag, for food in particular for the packing of fresh product, paper is filter paper in particular, lint (Flock), clothes are filling wool overcoat (Inlay-Vliesen) and for the application of the apparel textile of moisture management (mix with other fiber or as sandwich construction) and wound dressing in particular.

Example:

According to prior art, become known for manufacturing the Y shape fiber with the absorber of high absorbent capacity.By the alar part in this existence, fibrillar center keeps very large distance each other, thereby produces the structure with high fluid storage ability.Yet the size by formed hole has limited capillarity.Fig. 1 has shown the attached of two traditional

Y shape fibers

1,2 and the pore structure forming thus.

Same according to the known manufacture of prior art the fiber with flattened cross-sectional.It is not preferred only using flat fiber to be used for absorber, because it is because its structure may be very closely against each other, and the structure forming thus has only very little absorbability, sees Fig. 2, show therein flat fiber 1' against each other, 2'(etc.).

Another problem of flat fiber is, it can be relatively easily around its thinner axle bending.Therefore, the avalanche easily of the cavity in being loaded with the absorber of liquid.

Now, in fiber according to the present invention, by arranging suitably at least one preferably a plurality of limb of diverging from microscler section and design suitably its size and can realize less hole dimension.

Fig. 3 shown with microscler section 3 and a plurality of in the situation of Fig. 3 substantially with microscler section 3 meet at right angles from the

limb

4,5,6,7 of microscler section 3 forks according to the preferably form of implementation of fiber 1'' of the present invention.This fiber can be by making rayon spinning material spray silk by the spinneret orifice that (that is to say the section of flute profile and the section of the limb shape that branches out from this section) with configuring accordingly.

As shown in Fig. 3,

limb

4,5,6,7 length be less than respectively microscler section length 40%.The width of limb is less than respectively the width of microscler section.

According in the fiber process of prior art, make in certain proportion fiber parallel.Therefore, below consider first from parallel fiber.

The limb of the structure that fiber according to the present invention is made is as distance piece, and its when a plurality of this fibers are attached to one another (seeing Fig. 4) forms a large amount of very thin capillaries.

Meanwhile, limb is also as rib and distance piece, and this has prevented that fiber is crooked on the thinner axle of flat pars fibrosa.By this way, guaranteed high absorbability.

According to another advantage of fiber of the present invention, be, especially advantageously in a large amount of gaps between the limb of fiber, by adhesive force, store water, this is shown in Figure 5.Thus, according to the structure of fiber of the present invention, there is the extra high moisture holding capacity that overcomes pressure.

Claims

1. the cellulose fibre of a regeneration (1''), its cross section has microscler flat section (3) substantially, it is characterized in that, from described microscler section, branch out at least one limb (4,5,6,7), the length of this at least one limb be to the maximum described microscler section length 40%.

2. cellulose fibre according to claim 1, is characterized in that, described limb (4,5,6,7) is arranged to substantially meet at right angles with respect to described microscler section (3).

3. cellulose fibre according to claim 1 and 2, is characterized in that, the limb (4,5,6,7) of a plurality of branches is set.

4. cellulose fibre according to claim 3, is characterized in that, from described microscler section (3), branch is out on both direction for described limb (4,5,6,7).

5. according to the cellulose fibre described in claim 3 or 4, it is characterized in that, the total length of the limb of described branch (4,5,6,7) is no more than the length of described microscler section (3).

6. according to cellulose fibre in any one of the preceding claims wherein, it is characterized in that, at least a portion in described limb (4,5,6,7), preferably all limbs have the length-width ratio of 2:1 to 10:1.

7. according to cellulose fibre in any one of the preceding claims wherein, it is characterized in that, at least a portion in described limb (4,5,6,7), preferably all limbs have the less width of width than described flat section (3).

8. according to cellulose fibre in any one of the preceding claims wherein, it is characterized in that, the whole bending of described flat section is 120 ° to the maximum.

9. according to cellulose fibre in any one of the preceding claims wherein, it is characterized in that, fibre number is 1.3dtex to 10dtex.

10. according to cellulose fibre in any one of the preceding claims wherein, it is characterized in that, described cellulose fibre using staple, cut off the form of staple fibre or exist as tow.

11. 1 kinds of fibre bundles, the cellulose fibre that its racemosus that comprises a plurality of regeneration is dry, wherein, at least 10%, preferably at least 20%, especially preferably at least 50% of the dry cellulose fibre of described racemosus with the form according to cellulose fibre in any one of the preceding claims wherein, exist.

12. fibre bundles according to claim 11, is characterized in that, the cross section of the cellulose fibre that involved racemosus is dry is identical substantially.

13. 1 kinds for the manufacture of according to the method for the cellulose fibre of the regeneration described in any one in the claims or fibre bundle, and the method comprises the following steps:

-rayon spinning material is provided,

-by least one hole of spinning-nozzle, described rayon spinning material is sprayed in the situation that forming strand to silk in spinning bath,

It is characterized in that, the hole of described spinning-nozzle has the section of flute profile, branches out at least one limb from described section, the length of this at least one limb mostly be most described flute profile section length 40%.

14. methods according to claim 12, is characterized in that, described spinning-nozzle has a plurality of holes, wherein porosely all there is substantially the same shape.

15. according to the regenerated celulose fibre described in any one in claim 1 to 9 or fibre bundle at the product that plays absorption, amenities is tampon, incontinent patients articles for use, panty liner and sanitary napkin in particular, packing material for sheet, cushion and sleeping bag, for food in particular for the packing of fresh product, paper is filter paper in particular, lint, clothes are the purposes in filling wool overcoat and wound dressing in particular.