CN104254647A

CN104254647A - Fibrous structures and methods for making same

Info

Publication number: CN104254647A
Application number: CN201380010458.9A
Authority: CN
Inventors: D·W·卡贝尔; J·G·麦克尔; H·埃罗格卢
Original assignee: Procter and Gamble Ltd
Current assignee: Procter and Gamble Ltd; Procter and Gamble Co
Priority date: 2012-02-22
Filing date: 2013-02-21
Publication date: 2014-12-31
Also published as: WO2013126492A1; EP2817454A1; AU2013222507A1; WO2013126492A8; BR112014020483A2; MX2014009018A; EP2817454B1; CA2865269A1; US20130216809A1; CA2865269C; RU2014128490A; JP2015511278A

Abstract

Fibrous structures containing a plurality of solid additives and a plurality of filaments are provided.

Description

Fibre structure and preparation method thereof

Technical field

The present invention relates to fibre structure, relate more specifically to the fibre structure comprising many kinds of solids additive and plurality of threads, and even relate more specifically to the fibre structure comprising many kinds of solids additive and Duo Gen starch filament, and for the preparation of the method for this fiber-like structures.

Background technology

The fibre structure as starch filament is known in the art as paper pulp fiber and long filament to comprise solid additive.Use long filament source if melt-blown spinnerets is to prepare this fiber-like structures.Traditionally, melt-blown spinnerets relative to fibre structure longitudinally orientation is identical each other, described fibre structure is made up of the long filament being provided by this type of melt-blown spinnerets.Such as, described melt-blown spinnerets and longitudinal orientation at an angle of 90.Be by the problem that fibre structure is prepared as melt-blown spinnerets in the long filament source of orientation identical (such as with longitudinally at an angle of 90), each filament layer in the fibre structure provided by each long filament source shows the orientation identical with other filament layer each in other long filament source each, as shown in fig. 1.The fibre structure 10 of three layers 12 comprising long filament 14 has been shown in Fig. 1, and wherein each layer 12 is prepared by long filament source, and described long filament source and longitudinal orientation at an angle of 90, this makes each layer 12 of long filament 14 all show machine-direction oriented.Therefore, comprise solid additive 16 (such as paper pulp fiber) and show the fibre structure 10 of three layers 12 of long filament 14 of same orientation, what show is greater than 2 as the mean specific measured by dry tensile strength method of testing as herein described.The impact showing the filament layer of same orientation is by the fibre structure prepared with the speed being greater than 200ft/min and/or aggravated by the fibre structure being greater than 20 inches wide.

In addition to the above, this area also known filament thermoplastic polymer preparation provided by spunbond spinnerets and/or melt-blown spinnerets does not have solid additive such as not have the fibre structure of paper pulp fiber, and described spunbond spinnerets and/or melt-blown spinnerets become different angles orientation relative to the longitudinal direction of fibre structure.

Therefore, need a kind of fibre structure and the method for the preparation of this fiber-like structures, described fibre structure comprises many kinds of solids additive such as paper pulp fiber, and plurality of threads such as starch filament, wherein said long filament is present in fibre structure with the form of two or more different layers based on their orientations in each layer.

Summary of the invention

The present invention meets above-mentioned needs by providing tencel structure, and described fibre structure comprises many kinds of solids additive such as paper pulp fiber, and plurality of threads such as starch filament.

In an example of the present invention, a kind of fibre structure is provided, described fibre structure comprises many kinds of solids additive and plurality of threads, and wherein said long filament is present in fibre structure with the form of two or more different filament layers based on their orientations in each layer.

In another example of the present invention, a kind of fibre structure is provided, described fibre structure comprises plurality of threads, and described long filament comprises one or more polysaccharide, wherein said fibre structure show as the draw ratio measured by dry tensile strength method of testing as herein described be 2 or less.

In another example of the present invention, provide the single many or multi-layer thin page sanitary tissue products comprised according to fibre structure of the present invention.

In another example of the present invention, be provided for the method preparing fibre structure, said method comprising the steps of:

A. plurality of threads is provided from long filament source; And

B. on gathering-device, collect described long filament to form fibre structure, described fibre structure is shown as the draw ratio measured by draw ratio method of testing as herein described be 2 or less.

In even another example of the present invention, be provided for the method preparing fibre structure, said method comprising the steps of:

A. the first long filament is provided by the first long filament source;

B. the second long filament is provided by the second long filament source;

C. optionally, additional long filament is provided by the long filament source added;

D. solid additive is provided from solid additive source; And

E. described first and second long filaments (with any additional long filament) and solid additive is collected to form fibre structure, the longitudinal direction of wherein said first long filament source and fibre structure is at a first angle, and the second long filament source and the second angular orientation longitudinally becoming to be different from the first angle.

Therefore, the invention provides fibre structure and the method for the preparation of fibre structure, described fibre structure meets above-mentioned needs.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of prior art fibre structure;

Fig. 2 is the schematic diagram of the example according to fibre structure of the present invention;

Fig. 3 is the photo of the filament layer of the fibre structure prepared by long filament source, longitudinal orientation at an angle of 90 of described long filament source and fibre structure;

Fig. 4 is the photo of the filament layer of the fibre structure prepared by long filament source, and the longitudinal direction of described long filament source and fibre structure is into about 40 ° of angular orientations;

Fig. 5 is the schematic diagram of an example according to fibre structure of the present invention;

Fig. 6 is the profile of the fibre structure of Fig. 5 that 6-6 along the line intercepts;

Fig. 7 is the schematic diagram of an example for the preparation of the method according to fibre structure of the present invention;

Fig. 8 is the schematic diagram of an example of a part according to fibre structure preparation method of the present invention;

Fig. 9 is the schematic diagram of the example according to melt-blown spinnerets of the present invention;

Figure 10 A is the schematic diagram of the example according to double screw extruder cylinder of the present invention; And

Figure 10 B is the schematic diagram of screw rod for the double screw extruder of Figure 10 A and hybrid element configuration.

Detailed description of the invention

definition

As used herein, " fibre structure " refers to and comprises one or more long filament such as plurality of threads, and one or more solid additives are as the structure of many paper pulp fibers.In one example in which, be that formed together can the long filament of structure of n-back test and the associated matter of solid additive according to fibre structure of the present invention.

Non-limitative example for the preparation of the method according to fibre structure of the present invention comprises known wet spinning technology, solution spinning processes and the dry continuous yarn spinning technique that are commonly called nonwovens process.In one example in which, continuous yarn spinning technique is melt-blown process, and wherein long filament is provided by melt-blown spinnerets (long filament source).The further processing to fibre structure can be carried out, finished fiber structure is formed.Such as, finished fiber structure is the fibre structure be wound at the end of fibre structure preparation process on spool.Finished fiber structure can be converted subsequently and be processed as finished product, such as thin page sanitary tissue products.

As used herein, " long filament " refers to that length substantially exceeds the elongated particle of its average diameter, and namely length and average diameter ratio are at least about 10.In one example in which, long filament is one filament instead of yarn, and described yarn is along its length sth. made by twisting strand of long yarn together.In one example in which, long filament shows and is more than or equal to 5.08cm and/or is more than or equal to 7.62cm and/or is more than or equal to 10.16cm and/or is more than or equal to the length of 15.24cm.

Long filament is considered to be in fact continuous print or continuous print substantially usually, is especially present in fibre structure wherein relative to them.Long filament is relatively long than fiber.The non-limitative example of long filament comprises melt-blown and/or spun-bonded continuous yarn.The non-limitative example that can be spun into the polymer of long filament comprises natural polymer (if starch, starch derivatives, cellulose are as artificial silk and/or Lyocell fibers and cellulose derivative, hemicellulose, hemicellulose derivative) and synthetic polymer (include but not limited to that filament thermoplastic polymer is if polyester, nylon, polyolefin are as polypropylene filament, polyethylene filament, and biodegradable thermoplastic fibre being as PLA long filament, polyhydroxyalkanoatefrom long filament, polyesteramide long filament and PC long filament).

Long filament of the present invention can be one pack system and/or multicomponent.Such as, long filament can comprise bicomponent filament.Bicomponent filament can be any form, such as parallel type, core-integumentary pattern, fabric of island-in-sea type etc.

As used herein, " solid additive " refers to solid particle, such as powder, particle and/or fiber.

As used herein, " fiber " refers to elongated particle as above, and it shows the length being less than 5.08cm and/or being less than 3.81cm and/or being less than 2.54cm.

It has been generally acknowledged that fiber is discontinuous in fact, especially relative to fibre structure.The non-limitative example of fiber comprises paper pulp fiber as wood pulp fibre, and synthetic staple such as polypropylene, polyethylene, polyester, their copolymer, artificial silk, glass fibre and vinal.

Then described tow is cut into the fragment that is less than 5.08cm by filament tow being carried out spinning and produces by staple fibre, prepares staple fibre thus.

In an example of the present invention, fiber can be naturally occurring fiber, and this refers to that it derives from naturally occurring source such as vegetalitas source, such as tree and/or plant.This fibrid is generally used for papermaking and is usually referred to as paper fibre.The cellulose fibre being commonly referred to as wood pulp fibre is comprised for paper fibre of the present invention.Wood pulp applicatory comprises chemical wood pulp, such as ox-hide wood pulp, sulphite wood pulp and sulfate wood pulp, and groundwood pulp, comprises the thermomechanical pulp of such as wood fragments slurry, thermomechanical pulp and chemical modification.But, can preferred chemical wood pulp, because they give excellent flexible touch to by its obtained tissue sheets.Also can utilize and derive from deciduous tree (being also referred to as hereinafter " hardwood ") and coniferous tree (being also referred to as hereinafter " cork ") both wood pulps.Hardwood fiber and cork fibrous can be blended, or alternatively deposit the fiber web providing layering as a layer.Also being applicable to of the present invention is derive to reclaim the fiber of paper, its can comprise the above-mentioned type fiber any one or all and for promoting other non-fiber polymer such as filler, softening agent, wet strength agent and dry strength agent and the adhesive of initial papermaking.

Except various wood pulp fibre, other cellulose fibre such as velveteen, artificial silk, Lyocell fibers and sugarcane fiber in fibre structure of the present invention, also can be used.

In another example, fibre structure can comprise solid additive, and described solid additive comprises trichome and/or seed hair.

As used herein, " filament layer " refers to the plurality of threads at least partially forming fibre structure, and described in described fibre structure, the long filament of layer is along common first power to extension.In other words, the long filament of described layer shows common first power to orientation.Such as, the long filament of layer can show machine-direction oriented.In another example, the long filament of layer can show and be different from longitudinal orientation, such as, angular orientation longitudinally and between transverse direction.In one example in which, by one or more layers of long filament combination, such as can be deposited on and go up each other, to be formed according to fibre structure of the present invention.In addition, fibre structure can comprise two or more different layers of long filament.Such as, as shown in Figure 2, fibre structure 10 can comprise the ground floor 18 of long filament 14, and it shows machine-direction oriented, and the second layer 20 of long filament 14, and it shows the machine-direction oriented different orientation shown from ground floor 18.

As used herein, relative to the orientation of the long filament in filament layer, " orientation " refers to that long filament in layer is along common first power to extension.Obviously, some long filaments upwards extended at quadratic power can be there are in layer, but the most long filaments in layer upwards extend in common first power, and described common first power is to the orientation building long filament in layer.As shown in Figure 3, filament layer shows machine-direction oriented.In the diagram, filament layer shows relative to the angled orientation of the longitudinal direction of described layer.In another example, long filament source, as the angle (longitudinal direction relative to the fibre structure made) of melt-blown spinnerets, provides the orientation limited to the long filament of the filament layer obtained by long filament source.Therefore, if prepare two or more filament layers by two or more long filament sources (such as melt-blown spinnerets), described long filament source is relative to longitudinally becoming different angles (such as with longitudinally become in the scope of 0 ° to 90 ° of plus or minus) orientation, then the long filament in two or more layers described under default situations will show different orientation.

For measurement long filament source as the object of the orientation angles of melt-blown spinnerets, measure the smaller angle relative to longitudinal direction and think that it is the angle of the orientation in long filament source.If the angle of the orientation in long filament source is relative to longitudinally identical, then the angle of orientation is 90 °.

As used herein, " nonwoven substrate " refers to the fiber web comprising one or more filament layers of the present invention.

As used herein, " thin page sanitary tissue products " refer to can be used as size anal cleaning wiping tool (toilet paper), for the wiping tool (face tissue) of otorhinolaryngolical discharges and the fibre structure of Multifunctional absorption and clean purposes (absorbent napkin).Thin page sanitary tissue products can around core or coreless winding from it, to form thin page sanitary tissue products volume.

In one example in which, thin page sanitary tissue products of the present invention comprises one or more according to fibre structure of the present invention.

Thin page sanitary tissue products of the present invention can show between about 10g/m ²to about 120g/m ²between and/or about 15g/m ²to about 110g/m ²and/or about 20g/m ²to about 100g/m ²and/or about 30 to 90g/m ²basic weight.In addition, thin page sanitary tissue products of the present invention can show between about 40g/m ²to about 120g/m ²between and/or about 50g/m ²to about 110g/m ²and/or about 55g/m ²to about 105g/m ²and/or about 60 to 100g/m ²basic weight.

Thin page sanitary tissue products of the present invention can show and be less than about 0.60g/cm ³and/or be less than about 0.30g/cm ³and/or be less than about 0.20g/cm ³and/or be less than about 0.10g/cm ³and/or be less than about 0.07g/cm ³and/or be less than about 0.05g/cm ³and/or about 0.01g/cm ³to about 0.20g/cm ³and/or about 0.02g/cm ³to about 0.10g/cm ³density.

Thin page sanitary tissue products of the present invention can be the form of thin page sanitary tissue products volume.That this type of thin page sanitary tissue products volume can comprise multiple connection but the fibre structure sheet of punching, described fibre structure sheet can distribute independent of adjacent sheet.

Thin page sanitary tissue products of the present invention can comprise additive such as softening agent, temporary wet strength agent, permanent wet strength agent, softening agent in bulk, lotion, siloxanes, wetting agent, latex, patterning latex and to be applicable to be included among thin page sanitary tissue products and/or on other additive types.

As used herein, " scrim " refers to web material, such as comprise the fiber web of long filament, it is for covering the solid additive in fibre structure of the present invention, between other filament layer that described solid additive is positioned in web material and fibre structure.In one example in which, scrim comprises web material, and described web material shows and is less than 10g/m ²and/or be less than 7g/m ²and/or be less than 5g/m ²and/or be less than 3g/m ²basic weight, and remaining one or more filament layer of fibre structure of the present invention shows and is greater than 10g/m ²and/or be greater than 15g/m ²and/or be greater than 20g/m ²and/or to about 120g/m ²basic weight.

As used herein, " hydroxy polymer " comprises any hydroxyl polymer-containing can being prepared long filament of the present invention by it.In one example in which, hydroxy polymer of the present invention comprise be greater than by weight 10% and/or be greater than 20% and/or be greater than 25% hydroxylic moiety.In another example, the hydroxyl Bu Shi great functional group in hydroxyl polymer-containing is as a part for hydroxy-acid group.

As used herein, relative to the polymer in long filament entirety and/or long filament, " non-thermal plasticity " refers to that long filament and/or polymers exhibit go out without fusing point and/or softening point, this do not exist plasticizer as situations such as water, glycerine, sorbierite, ureas under allow it to flow under stress.

As used herein, relative to the polymer in long filament entirety and/or long filament, " thermoplasticity " refers to that long filament and/or polymer show fusing point and/or softening point at certain temperature, and this allows it to flow under stress.

As used herein, " not containing cellulose " refer to exist in fibre element be less than by weight 5% and/or be less than 3% and/or be less than 1% and/or be less than 0.1% and/or 0% cellulosic polymer, cellulose derivatives copolymer and/or cellulose copolymer.In one example in which, " not containing cellulose " refers to exist in fibre element and is less than 5% and/or be less than 3% and/or be less than 1% and/or be less than the cellulosic polymer of 0.1% and/or 0% by weight.

As used herein, relative to long filament, " associate (Associate) ", " (Associated) of association ", " associating (Association) " and/or " associating (Associating) " to refer to long filament directly to contact or the mode of mediate contact combines, and fibre structure is formed.In one example in which, the long filament of association can be such as bonded together by adhesive and/or hot adhesion.In another example, long filament associates each other by depositing to the preparation of identical fibre structure and bringing.

" weight average molecular weight " used herein refers to gel permeation chromatography, according to being present in Colloids and Surfaces A.Physico Chemical & Engineering Aspects, 162nd volume, 2000, the weight average molecular weight that the code in 107-121 page is determined.

As used herein, term " basic weight " is with g/m ²for the weight of the per unit area sample of unit record.

As used herein, " longitudinal direction " or " MD " refers to and is parallel to by the direction of fibre structure preparation machine as the fibre structure stream of paper machine and/or product manufacturing device.

As used herein, " transverse direction " or " CD " refer to fibre structure and/or comprise described fibre structure thin page sanitary tissue products same level in perpendicular to the direction of longitudinal direction.

As used herein, " synusia " or " multiple synusia " refer to optionally with other synusia substantially the aspectant relation of continuous print arrange thus form the single fibre structure of multi-ply fibrous structure.Also imagine single fibre structure can such as effectively be formed by folding onto itself two " synusia " or multiple " synusia ".

As used herein, " spinning head " refers to and comprises the plate that one or more long filament forms nozzle, and the long filament of melt composition can flow out from described nozzle.In one example in which, described spinning head comprises the multiple long filaments formation nozzles being arranged to one or more row and/or row.This type of spinning head is called as multirow spinning head.

As used herein, " adjacent to each other " relevant with two or more spinning heads adjacent to each other refers to the surface of a spinning head and the surface contact of another spinning head.

As used herein, " seam " refers to the contact wire between two adjacent spinneretss.

As used herein, " seam long filament formed jet hole " is that the nearest one or more long filaments of seam that span is formed by two adjacent spinning heads form jet hole.

When used herein, such as " a kind of anion surfactant " or " a kind of fiber ", be understood to the material referring to that one or more are claimed or described to article used herein " one ".

Except as otherwise noted, all percentage and ratio are all calculated by weight.Except as otherwise noted, all percentage and ratio all calculate based on total composition.

Unless otherwise stated, all components or composition levels are all the activity substance contents about this component or composition, and the impurity in not comprising the source that may be present in commercially available acquisition, such as residual solvent or byproduct.

long filament

In one example in which, fibre structure of the present invention comprises long filament, and described long filament comprises hydroxy polymer.In another example, described fibre structure can comprise starch and/or starch derivatives long filament.Described starch filament also can comprise polyvinyl alcohol and/or other polymer.

Long filament of the present invention can be obtained by polymer melt composition, described polymer melt composition comprise hydroxy polymer as non-crosslinked starch, comprise crosslinking agent as the cross-linking system of imidazolone and water.Described polymer melt composition also can comprise surfactant as sulfosuccinate surfactant.The non-limitative example of suitable sulfosuccinate surfactant comprises aOT (dioctyl sodium sulphosuccinate) and/or mA-80 (dihexyl sodium sulfosuccinate), it can be commercially available from Cytec Industries (Woodland Park, NJ).

In one example in which, long filament of the present invention comprises the weighing scale by described long filament, be greater than 25% and/or be greater than 40% and/or be greater than 50% and/or be greater than 60% and/or be greater than 70% to about 95% and/or to about 90% and/or to about 80% hydroxy polymer as starch, it can be in crosslinking condition.In one example in which, described long filament comprises ethoxylated starches and acidified starch, and it can be in their crosslinking condition.

Except hydroxy polymer, described long filament also can comprise polyvinyl alcohol, and its content, by the weighing scale of described long filament, is 0% and/or 0.5% and/or 1% and/or 3% to about 15% and/or extremely about 12% and/or extremely about 10% and/or extremely about 7%.

Described long filament can comprise surfactant as sulfosuccinate surfactant, and its content, by the weighing scale of described long filament, is 0% and/or about 0.1% and/or about 0.3% to about 2% and/or extremely about 1.5% and/or extremely about 1.1% and/or extremely about 0.7%.

Described long filament also can comprise and is selected from following polymer and their mixture: polyacrylamide and derivative thereof; Polyacrylic acid, polymethylacrylic acid and their ester; Polymine; The copolymer be made up of the mixture of the monomer of aforementioned polymer; Its content, by the weighing scale of described long filament, is 0% and/or about 0.01% and/or about 0.05% and/or extremely about 0.5% and/or extremely about 0.3% and/or extremely about 0.2%.This base polymer can show the weight average molecular weight being greater than 500,000g/mol.In one example in which, described long filament comprises polyacrylamide.

Described long filament also can comprise crosslinking agent as imidazolone, it can be in its crosslinking condition (will be present in the crosslinks hydroxyl polymers in long filament), and the content of described crosslinking agent counts about 0.5% and/or about 1% and/or about 2% and/or about 3% and/or extremely about 10% and/or extremely about 7% and/or extremely about 5.5% and/or extremely about 4.5% by the weight of described long filament.Except crosslinking agent, long filament also can comprise the crosslinking accelerator of auxiliary crosslinking agent, and its content counts 0% and/or about 0.3% and/or about 0.5% and/or extremely about 2% and/or extremely about 1.7% and/or extremely about 1.5% by the weight of described long filament.

Described long filament also can comprise other composition various, such as propylene glycol, sorbierite, glycerine and their mixture.

polymer

The long filament of the present invention forming fibre structure of the present invention by associating can comprise various types of polymer, such as hydroxy polymer, Non-thermoplastic polymer, thermoplastic polymer and their mixture.

Non-limitative example according to hydroxy polymer of the present invention comprises polyalcohol, such as polyvinyl alcohol, polyvinyl alcohol derivative, polyvinyl alcohol copolymer, starch, starch derivatives, starch copolymer, chitosan, chitosan derivative, chitosan copolymer, cellulose, cellulose derivative such as cellulose ether and cellulose ether derivatives, cellulose copolymer, hemicellulose, hemicellulose derivative, hemicellulose copolymer, natural gum, araban, galactan, protein and other polysaccharide various, and their mixture.

In one example in which, hydroxy polymer of the present invention is polysaccharide.

In another example, hydroxy polymer of the present invention is Non-thermoplastic polymer.

Hydroxy polymer can have about 10,000g/mol to about 40,000,000g/mol and/or be greater than about 100,000g/mol and/or be greater than about 1,000,000g/mol and/or be greater than about 3,000,000g/mol and/or be greater than about 3, the weight average molecular weight of 000,000g/mol to about 40,000,000g/mol.Higher and hydroxy polymer that is lower molecular weight can with the hydroxy polymer conbined usage with the weight average molecular weight that certain is expected.

Hydroxy polymer, as the modification known of native starch, comprises chemical modification and/or enzyme modification.Such as, native starch can be acid hydrolysis, hydroxyethylation, hydroxypropylation and/or oxidation.In addition, hydroxy polymer can comprise dent corn starch hydroxy polymer.

Grafting polyvinyl alcohol herein can be carried out, to change its performance with other monomer.Successfully will be monomer-grafted to polyvinyl alcohol in a large number.The non-limitative example of this type of monomer comprises vinyl acetate, styrene, acrylamide, acrylic acid, HEMA, acrylonitrile, 1,3-butadiene, methyl methacrylate, methacrylic acid, vinylidene chloride, vinyl chloride, vinylamine and multiple acrylate.Polyvinyl alcohol comprises the various hydrolysates formed by polyvinyl acetate.In one example in which, the hydrolysis degree of polyvinyl alcohol is greater than 70% and/or be greater than 88% and/or be greater than 95% and/or about 99%.

As used herein, term " polysaccharide " refers to natural polysaccharide and polysaccharide derivates and/or modification of polysaccharides.Suitable polysaccharide includes but not limited to starch, starch derivatives, chitosan, chitosan derivative, cellulose, cellulose derivative, hemicellulose, hemicellulose derivative, natural gum, araban, galactan and their mixture.Polysaccharide can show about 10, and 000 to about 40,000,000g/mol and/or be greater than about 100,000 and/or be greater than about 1,000,000g and/or be greater than about 3,000,000g and/or be greater than about 3,000, the weight average molecular weight of 000 to about 40,000,000.

Non-cellulose and/or non-cellulose derivative and/or non-cellulose copolymer hydroxy polymer, as non-cellulosic polysaccharide, can be selected from: starch, starch derivatives, chitosan, chitosan derivative, hemicellulose, hemicellulose derivative, natural gum, araban, galactan and their mixture.

In one example in which, long filament of the present invention is not containing thermoplasticity insoluble polymer.

solid additive

In solid form solid additive of the present invention can be applied to the surface of filament layer.In other words, solid additive of the present invention when there is not liquid phase, namely when not by solid additive melting with when not being suspended in liquid vehicle or carrier by solid additive, can be delivered directly to the surface of filament layer.Therefore, in order to be delivered to the surface of filament layer, solid additive of the present invention does not need liquid state or liquid vehicle or carrier.Solid additive of the present invention can be sent via the combination of gas or multiple gases.In one example in which, express with simple term, solid additive is when being placed in container, the additive not in this container shapes.

In one example in which, one or more solid additives can be present on the surface of fibre structure of the present invention.

Solid additive of the present invention can have different geometries and/or cross section, and it comprises circle, ellipse, star, rectangle, trilobal and other multiple eccentrical shape.

In one example in which, solid additive can show its full-size and is less than 6mm and/or is less than 5.5mm and/or is less than 5mm and/or is less than 4.5mm and/or is less than 4mm and/or is less than the granularity of 2mm.

Solid additive of the present invention can show and be less than about 25/1 and/or be less than about 15/1 and/or be less than about 10/1 and/or be less than the aspect ratio of 5/1 to about 1/1.Described particle is not fiber defined herein.

The content being present in the solid additive in fibre structure of the present invention can for being greater than about 1 and/or be greater than about 2 and/or be greater than about 4 and/or to about 20 and/or to about 15 and/or to about 10g/m ².In one example in which, fibre structure of the present invention comprises about 2 to about 10 and/or about 5 to about 10g/m ²solid additive.

In one example in which, the content being present in the solid additive in fibre structure of the present invention by weight, is greater than 5% and/or be greater than 10% and/or be greater than 20% to about 50% and/or to about 40% and/or to about 30%.

In one example in which, solid additive 14 comprises fiber, such as wood pulp fibre.Wood pulp fibre can be softwood pulp fibers and/or hardwood pulp fibers.In one example in which, wood pulp fibre comprises eucalyptus pulp fiber.In another example, described wood pulp fibre comprises southern softwood kraft slurry (SSK) fiber.

Described solid additive can be through chemically treated, such as, through chemically treated paper pulp fiber.In one example in which, described solid additive comprises softening agent and/or uses softening agent treatment surface.The non-limitative example of suitable softening agent comprises siloxanes and/or quaternary ammonium compound, as purchased from Hercules Incorporated in one example in which, solid additive comprises the wood pulp with the process of quaternary ammonium compound softening agent, and an example of this softening agent is purchased from Georgia-Pacific Corporation.Only softening agent being applied to solid additive with the advantage be applied to by softening agent compared with whole fibre structure and/or nonwoven substrate and/or binding material is ensure that softening agent softens those components needing softening whole fibre structure compared to other component of whole fibre structure.

nonwoven substrate

Nonwoven substrate of the present invention comprises one or more filament layer.Two or more filament layers of composition nonwoven substrate can have identical or different orientation.In one example in which, nonwoven substrate comprises the filament layer that two or more show different orientation.

In one example in which, nonwoven substrate comprises plurality of threads, and described long filament comprises hydroxy polymer.Described hydroxy polymer can be selected from polysaccharide, their derivative, polyvinyl alcohol, their derivative and their mixture.In one example in which, described hydroxy polymer comprises starch and/or starch derivatives.Nonwoven substrate 12 can show and be greater than about 10g/m ²and/or be greater than about 14g/m ²and/or be greater than about 20g/m ²and/or be greater than about 25g/m ²and/or be greater than about 30g/m ²and/or be greater than about 35g/m ²and/or be greater than about 40g/m ²and/or be less than about 100g/m ²and/or and/or be less than about 90g/m ²and/or be less than about 80g/m ²basic weight.

fibre structure

In one example in which, as illustrated in Figures 5 and 6, fibre structure 10 of the present invention comprises nonwoven substrate 26, described nonwoven substrate comprises one or more filament layer, many kinds of solids additive 16 as paper pulp fiber, described solid additive is positioned between nonwoven substrate 26 and scrim 28, and described scrim is glued to nonwoven substrate 26 at one or more bonded part 30 place.Bonded part 30 be scrim 28 at least partially with the part that is connected to each other at least partially of nonwoven substrate 26, described connection such as via hot adhesion, or by both scrim 28 and nonwoven substrate 26 apply high pressure make glassining effect occur (" pressure bonding ") and produce bonding carry out.

In one example in which, solid additive 16 can be evenly distributed on the surface 32 of nonwoven substrate 26.

In one example in which, scrim 28 comprises one or more layers of long filament of the present invention.In one example in which, scrim 28 is made up of the single layer of long filament of the present invention.Scrim 28 and nonwoven substrate 26 can comprise the long filament with same composition, such as hydroxyl polymer-containing long filament, as starch filament.Scrim 28 can be greater than 0.1 and/or be greater than 0.3 and/or be greater than 0.5 and/or be greater than 1 and/or be greater than 2g/m ²and/or be less than 10 and/or be less than 7 and/or be less than 5 and/or be less than 4g/m ²basic weight be present in fibre structure of the present invention.In one example in which, scrim 28 can about 0.1 to about 4g/m ²basic weight be present in fibre structure of the present invention.

An object of scrim 28 reduces by suppressing solid additive 16 to become to be separated with fibre structure 10 velveteen produced by fibre structure 10.Scrim 28 also can provide additional strength characteristics to fibre structure 10.

As illustrated in Figures 5 and 6, bonded part 30 can comprise multiple discrete bonded part.Discrete bonded part can non-random repeating pattern form exist.One or more bonded part 30 can comprise hot adhesion and/or pressure bonding.

In one example in which, fibre structure of the present invention comprises plurality of threads, and as hydroxyl polymer-containing long filament, wherein said long filament is present in fibre structure with the form of two or more different filament layers based on their orientations in each layer.

What fibre structure of the present invention showed unexpectedly is 2 or less as the mean specific (MD stretching/CD stretches) measured by dry tensile strength method of testing as herein described and/or is less than 1.7 and/or be less than 1.5 and/or be less than 1.3 and/or be less than 1.1 and/or be greater than 0.7 and/or be greater than 0.9.In one example in which, fibre structure of the present invention show as the mean specific measured by dry tensile strength method of testing as herein described be about 0.9 to about 1.1.

The example of the draw ratio of fibre structure that following table 1 shows fibre structure of the present invention and compares.

Table 1

Fibre structure of the present invention can comprise surperficial softening agent.Described surperficial softening agent can be applied to the surface of fibre structure.Softening agent can comprise siloxanes and/or quaternary ammonium compound.

Fibre structure of the present invention can comprise embossing and fibre structure is stamped.

In one example in which, fibre structure comprises nonwoven substrate, it has the many kinds of solids additive be present on two apparent surfaces of nonwoven substrate, described solid additive is positioned between nonwoven substrate surface and one or more scrim, and described scrim is bonded to each of nonwoven substrate surface.Described solid additive can be similar and different or can different content or same amount exist, and can be evenly distributed on the apparent surface of nonwoven substrate.Scrim can be similar and different or can different content or same amount exist, and can be bonded to the apparent surface of nonwoven substrate at one or more bonded part place.

In one example in which, fibre structure of the present invention can comprise a synusia in multi-layer thin page sanitary tissue products.

In another example, provide multi-layer thin page sanitary tissue products, it comprises two or more synusia according to fibre structure of the present invention.In one example in which, two or more synusia of fibre structure according to the present invention are combined to form multi-layer thin page sanitary tissue products.Can each at least one outer surface of solid additive and multi-layer thin page sanitary tissue products and/or outer surface be made adjacent the combination of two or more synusia.

prepare the method for fibre structure

Fig. 7 and 8 illustrates an example of the method for the preparation of fibre structure of the present invention.As shown in FIG. 7 and 8, method 34 comprises the following steps:

A. provide the first long filament 36 by the first long filament source 38, it forms the first filament layer 40;

B. provide the second long filament 42 by the second long filament source 44, it forms the second filament layer 46;

C. provide the 3rd long filament 48 by the 3rd long filament source 50, it forms the 3rd filament layer 52;

D. solid additive 16 is provided by solid additive source 54;

E. provide the 4th long filament 56 by the 4th long filament source 58, it forms the 4th filament layer 60; And

F. the first long filament 36 is collected, second long filament 42, 3rd long filament 48 and the 4th long filament 56 and solid additive 16 are to form fibre structure 10, wherein the first long filament source 38 becomes the first angle [alpha] orientation with the longitudinal direction of fibre structure 10, second long filament source 44 becomes the second angle beta orientation with longitudinal direction, described second angle is different from the first angle [alpha], 3rd source 50 becomes the 3rd angle δ orientation with longitudinal direction, described 3rd angle is different from the first angle [alpha] and the second angle beta, and wherein said 4th source 58 becomes the 4th angle ε orientation with longitudinal direction, described 4th angle is different from the second angle beta and the 3rd angle δ.

Gathering-device 62 is collected the first filament layer 40, second filament layer 46 and the 3rd filament layer 52, and described gathering-device can be band or fabric.Gathering-device 62 can be patterning belt, and it can give pattern to fibre structure 10 in fibre structure preparation process, such as non-random repeating pattern.Gathering-device 62 is collected the first filament layer 40, second filament layer 46 and the 3rd filament layer 52 (such as on top of each other), to form multi-layer nonwoven substrate 26, deposition solid additive 16 in described nonwoven substrate.Then the 4th filament layer 60 can be deposited on solid additive 16 to form scrim 28.

First angle [alpha] and the 4th angle ε can be identical angle, such as, with longitudinally in 90 °.

Second angle beta can be identical angle with the 3rd angle δ, is only positive negative each other.Such as, the second angle beta can be with longitudinal become-40 °, and the 3rd angle δ can be with longitudinal become+40 °.

In one example in which, the first angle [alpha], the second angle beta and the 3rd angle δ become to be less than 90 ° with longitudinal.In another example, the first angle [alpha] and/or the 4th angle ε with longitudinally into about 90 °.In another example, the second angle beta and/or the 3rd angle δ with longitudinally into about ± 10 ° to about ± 80 ° and/or about ± 30 ° to ± 60 ° and/or with longitudinal direction into about ± 40 °.

In one example in which, before in the method being used to prepare above-mentioned fibre structure, the first filament layer 40, second filament layer 46 and the 3rd filament layer 52 can be configured as nonwoven substrate 28.In this case, non-fabrication substrate 28 may can be unwound in the female roller in fibre structure preparation method, and solid additive 16 may be directly deposited on the surface 32 of nonwoven substrate 28.

In one example in which, nonwoven substrate 26 provides the step of multiple solid additive 16 to comprise and use air-laid former to make solid additive 16 air lay.The non-limitative example of suitable air-laid former is purchased from Dan-Web of Aarhus, Denmark.

In one example in which, thering is provided the 4th long filament 56 to make the step of described filament contact solid additive 16 comprise deposition the 4th long filament 56 makes (in one example in which all or substantially whole) at least partially of described solid additive 16 be contacted by the 4th long filament 56, thus solid additive 16 is positioned at the step between the 4th filament layer 60 and nonwoven substrate 26.Once the 4th filament layer 60 keeps in position, just can carry out adhesion step to fibre structure 10, the 4th filament layer 60 (in this case, scrim 28) is bonded to nonwoven substrate 26 by described adhesion step.This adhesion step can comprise hot adhesion operation.Hot adhesion operation can comprise makes fibre structure 10 through the roll gap formed by hot adhesion roller 64,66.At least one comprised pattern in hot adhesion roller 64,66, described pattern is converted to the bonded part 30 formed in fibre structure 10.

Except carrying out bonding operation, also can carry out that other post-processing operation such as impresses, clusters into fibre structure, gear rolling (it comprises makes fibre structure pass the roll gap formed by two meshing gear rollers), wet operations, free fiber ends generate and surface treatment, to form finished product fibre structure.In one example in which, by making fibre structure pass the roll gap formed by least one pair of mill pinion, gear rolling is carried out to fibre structure.In one example in which, carry out gear rolling to fibre structure to make to produce free fiber ends in fibre structure.The combination of two or more fibre structures can carried out by gear rolling before or after forming multi-layer thin page sanitary tissue products.If it is carrying out afterwards, then make multi-layer thin page sanitary tissue products through the roll gap formed by least one pair of mill pinion.

Method for the preparation of fibre structure of the present invention can be combined closely with converting operation (wherein fibre structure was circled round wound into a roll before entering converting operation) or directly combine (wherein fibre structure was not circled round wound into a roll before entering converting operation), and described converting operation is impression, printing, distortion, surface treatment or other postforming operation known in the art.For the present invention, directly combine and refer to that fibre structure can directly enter in converting operation, instead of it is wound into a roll such as to circle round, then unwinding is to continue through converting operation.

In one example in which, one or more synusia according to fibre structure of the present invention can combine with another synusia of fibre structure (it can be according to fibre structure of the present invention), to form multi-layer thin page sanitary tissue products, what described multi-layer thin page sanitary tissue products showed is 2 or less as the draw ratio measured by dry tensile strength method of testing as herein described and/or is less than 1.7 and/or be less than 1.5 and/or be less than 1.3 and/or be less than 1.1 and/or be greater than 0.7 and/or be greater than 0.9.In one example in which, by two or more synusia of fibre structure according to the present invention are combined to form multi-layer thin page sanitary tissue products.In another example, can by two or more synusia of fibre structure according to the present invention combination to form multi-layer thin page sanitary tissue products, each making the outer surface of solid additive and the described multi-layer thin page sanitary tissue products existed in fibre structure synusia is adjacent.

Method of the present invention can comprise the single volume of the fibre structure prepared and be applicable to consumer's use and/or the thin page sanitary tissue products comprising this fiber-like structures one or more.

In one example in which, long filament source comprises melt-blown spinnerets, and described melt-blown spinnerets prepares long filament by polymer melt composition according to the present invention.In one example in which, as shown in Figure 9, melt-blown spinnerets 68 can comprise at least one long filament and form hole 70, and/or the long filament of 2 row or more row and/or 3 row or more row forms hole 70, is formed hole spin long filament from described long filament.At least a line long filament forms hole 70 and comprises 2 or more and/or 3 or more and/or 10 an or more long filament and form hole 70.Except long filament is formed except hole 70, melt-blown spinnerets 68 also comprises liquid discharge orifice 72, as gas release hole, is air discharge holes in one example in which, and it provides attenuating to being formed the long filament that hole 70 formed by long filament.One or more liquid discharge orifice 72 can form hole 70 with long filament and associate, and the fluid making to leave liquid discharge orifice 72 forms the outer surface parallel or substantially parallel (instead of angled as knife edge due) of the long filament in hole 70 with leaving long filament.In one example in which, the fluid leaving liquid discharge orifice 72 is to be less than 30 ° and/or be less than 20 ° and/or be less than 10 ° and/or the angle contact that is less than 5 ° and/or about 0 ° to be formed the long filament that hole 70 is formed outer surface by long filament.One or more liquid discharge orifice 72 can form hole 70 around long filament and arrange.In one example in which, one or more liquid discharge orifice 72 and single long filament form hole 70 and associate, and make the fluid contact leaving one or more liquid discharge orifice 72 be formed the outer surface of the one filament that hole 70 is formed by single long filament.In one example in which, liquid discharge orifice 72 allows fluid such as gas, and such as air contacts the outer surface being formed the long filament that hole 70 is formed by long filament, instead of such as can occur when forming tubular filament, the inner surface of contact long filament.

the synthesis of polymer melt composition

Polymer melt composition of the present invention can use screw extruder such as vented twin screw extruder to prepare.

The cylinder 74 of APV Baker (Peterborough, England) 40:1,48mm double screw extruder is schematically illustrated in Figure 10 A.Cylinder 74 is divided into eight districts, is designated as district 1-8.Cylinder 74 encloses extrusion screw rod and hybrid element (being shown schematically in Figure 10 B), and is used as containment vessel in extrusion.Feeding-in solid body mouth 76 is arranged in district 1, and liquid inlet opening 78 is also arranged in district 1.Ventilating opening 80 is included in for cooling in district 7, and for reducing the content of liquid (such as water) wherein before mixture leaves extruder.Can adopt and can flow out from ventilating opening 80 to prevent polymer melt composition from the optional ventilation filling machine that APV Baker is commercially available.Polymer melt composition starts through the flowing Shi Cong district 1 of cylinder 74, leaves cylinder 74 in district 8.

Screw rod and the hybrid element configuration of double screw extruder are shown schematically in Figure 10 B.As shown in table 2 below, double screw extruder comprises multiple pairs of driving screws (TLS) (being designated as A and B) and blade (being designated as C) and reverse two driving screw (RTLS) (being designated as D) that are installed in series.

District	Total length ratio	Element	Spacing	Length ratio	Component type
						?	?	?	?	?	?
1	1.5	TLS	1	1.5	A
						1	3.0	TLS	1	1.5	A
1	4.5	TLS	1	1.5	A
						2	6.0	TLS	1	1.5	A
2	7.5	TLS	1	1.5	A
						2	9.0	TLS	1	1.5	A
3	10.5	TLS	1	1.5	A
						3	12.0	TLS	1	1.5	A
3	13.0	TLS	1	1	A
						3	14.0	TLS	1	1	A
4	15.0	TLS	1	1	A
						4	16.0	TLS	1	1	A
4	16.3	Blade	0	0.25	C
						4	16.5	Blade	0	0.25	C
4	18.0	TLS	1	1.5	A
						4	19.5	TLS	1	1.5	A
5	21.0	TLS	1	1.5	A
						5	22.5	TLS	1	1.5	A
5	24.0	TLS	1	1.5	A
						5	25.0	TLS	1	1	A
6	25.3	TLS	1	0.25	A
						6	26.3	TLS	1	1	A
6	27.3	TLS	1	1	A
						6	28.3	TLS	0.5	1	B
6	29.3	TLS	0.5	1	B
						6	29.8	RTLS	0.5	0.5	D
7	30.3	RTLS	0.5	0.5	D
						7	30.8	RTLS	0.5	0.5	D
7	32.3	TLS	1	1.5	A
						7	33.8	TLS	1	1.5	A
7	34.8	TLS	1	1	A
						8	35.8	TLS	1	1	A
8	36.8	TLS	0.5	1	B
						8	37.8	TLS	0.5	1	B
8	38.8	TLS	0.5	1	B

8

40.3

TLS

0.5

1.5

B

Table 2

The feature of screw element A – B is the number of continuous guide rod and the spacing of these guide rods.Guide rod is the flight (being in given helical angle) of parcel screw element core.The number of the flight of core is wrapped up in the number display of guide rod in any given position along spiro rod length.The number increasing guide rod will reduce the volume of screw rod, and adds the pressure generating capability of screw rod.

Screw rod spacing is that flight is completely around the distance required for core one week.This spacing is expressed as the number of the screw element diameters of each flight complete cycle.The spacing reducing screw rod will increase the pressure produced by screw rod, and reduces the volume of screw rod.

The length of screw element is recorded into the ratio of leement duration divided by element diameter.

This example uses TLS and RTLS.Screw element types A is the TLS with 1.0 spacing and different length ratio.Screw element types B is the TLS with 0.5 spacing and different length ratio.

The double leaf shape that also comprising connects with TLS and RTLS screw element is used as hybrid element is starched C and is mixed to strengthen.Blade C has the length ratio of 1/4.Use the double leaf shape oar of various configuration and reverse screw elements D, in an opposite direction threaded single and double driving screw to control flowing and corresponding incorporation time.Screw element D is the RTLS with 0.5 spacing and 0.5 length ratio.

In district 1, hydroxy polymer uses K-Tron (Pitman, NJ) weight saving feeder to be admitted to feeding-in solid body mouth with the speed of 230 gram/minute.This hydroxy polymer mixes to form hydroxy polymer/aqueous slurry with water (external plasticizer) in extruder (district 1), described water uses Milton Roy (Ivyland, PA) membrane pump (1.9 gallons of pumps head per hour) to add with the speed of 146 gram/minute.Then these slurries are downwardly transferred the cylinder of extruder and boiling.Following table 3 describes the temperature in each district of extruder, pressure and corresponding function.

District	Temperature (℉)	Pressure	The explanation of screw rod	Object
					1	70	Low	Feed/transmission	Feed and mixing
2	70	Low	Transmit	Mixing and transmission
					3	70	Low	Transmit	Mixing and transmission
4	130	Low	Pressure/deceleration transmits	Transmit and heating
					5	300	In	Pressure produces	Boiling at an elevated temperature under pressure
6	250	High	Oppositely	Boiling at an elevated temperature under pressure
					7	210	Low	Transmit	Cooling and transmission (band ventilates)
8	210	Low	Pressure produces	Transmit

Table 3

After slurries leave extruder, partial melting processing hydroxy polymer pumped, and another part (100g) by feed in pEP II type (Sanford NC) and pumped enter SMX type static mixer (Koch-Glitsch, in (Woodridge, Illinois).Described static mixer is used for additive such as crosslinking agent, crosslinking accelerator, external plasticizer (such as water) are mixed with the hydroxy polymer of melt-processed.Additive via PREP 100HPLC pump (Chrom Tech (Apple Valley, MN) pumped enter in static mixer.These pump have high pressure, low volume to add ability.Polymer melt composition of the present invention is processed easily through polymer processing operation.

the synthesis of long filament

By the non-limitative example of the method for long filament being prepared by polymer melt composition Polymer Processing of the present invention.As used herein, " Polymer Processing " refers to any operation and/or the method for the long filament being formed the hydroxy polymer comprising processing by it by polymer melt composition.The non-limitative example of polymer processing operation draw together extrude, molding and/or fibre spinning.Extrude the extrusion pin making film, sheet and various profile with molding (casting or blowing) typical case.Molding can comprise injection moulding, blowing and/or compression moulding.Fibre spinning can comprise spun-bond process, meltblown, rotary spinning method, continuous filament yarn produces and/or bunch fiber produces.As used herein, " hydroxy polymer of processing " refers to any hydroxy polymer that experienced by melt-processed operation and subsequent polymer process operation.

For being prepared an example of the method for long filament of the present invention by following Inventive polymers melt composition.

Polymer melt composition is prepared according to above-mentioned " synthesis of polymer melt composition ".Use suitable pump such as the polymer melt composition pump be present in double screw extruder is drawn to melt-blown spinnerets by PEP II type, the capacity of described pump is for often to turn 10 cubic centimetres (cc/rev), by Sanford, NC, the Parker Hannifin Corporation of USA, Zenith Pumps division manufacture.The hydroxy polymer such as starch flowing into melt-blown spinnerets controls by regulating the revolutions per minute (rpm) of pump.By the pipe electrical heating of connecting extruder, pump, melt-blown spinnerets and optional agitator and thermostatic control to 65 DEG C.

Melt-blown spinnerets has several row circular extrusion nozzles, and described nozzle is spaced with the spacing P of about 2.489mm.Described nozzle is with staggered-mesh arranged in form, and interior spacing of being wherein expert at is about 2.489mm and spacing between being expert at is 2.159mm.Nozzle 200 has the single bore of about 0.254mm and the single outside diameter of about 0.813mm.Each single nozzles by the looping pit institute that formed in the orifice plate of thickness for about 1.9mm around.The pattern in the multiple holes in orifice plate corresponds to the pattern of extrusion nozzle in melt-blown spinnerets.Once orifice plate and melt-blown spinnerets combine, then the flow area of gained is about 36%.The humid air stream of the substantial cylindrical fixedly being made by described plate the long filament extruded through extrusion nozzle be provided by the hole through orifice plate is surrounded and attenuating.The outer surface that extrusion nozzle can exceed orifice plate extends to about 1.5mm to about 4mm, and the distance of more particularly about 2mm to about 3mm.Multiple boundary layer air hole is formed by being blocked by the extrusion nozzle of two outer row on every for multiple extrusion nozzle side, and as from Plane Angle, each making in boundary layer air hole comprises hereinbefore looping pit.In addition, the residue extrusion nozzle blocking in every line and arrange every, thus increase the spacing between available extrusion nozzle.

By resistance heater (such as by Pittsburgh, PA, the heater that the Chromalox of USA, Division of Emerson Electric manufactures) heated compressed air provides attenuating air, and described attenuating air is used for the long filament attenuating will prepared through extrusion nozzle.Add the appropriate steam under the absolute pressure of about 240 to about 420 kPas (kPa) controlled by globe valve, saturated or close to saturated to make under the condition of air in electrically heated thermostatically controlled delivery tube of heating.Condensate is removed in electrically heated and thermostatically controlled separator.When measuring in check delivery tube, attenuating air has the absolute pressure of about 130kPa to about 310kPa.The long filament extruded by extrusion nozzle has the moisture of by weight about 20% and/or about 25% to about 50% and/or extremely about 55%.With the dry air fluidized drying long filament that temperature is about 149 DEG C to about 315 DEG C, described dry air stream to be provided by dry nozzle by resistance heater and discharges with the angle substantially vertical relative to the roughly direction of extruded long filament.Long filament is dried to about 15% moisture (that is, denseness about 55% to denseness about 85%) from about 45% moisture, then at gathering-device, moveable porous belts such as, collects.

For the preparation of long filament of the present invention technological parameter as shown in Table 4 below.

Table 4

Cross-linking system via crosslinking agent as imidazolone by crosslinks hydroxyl polymers together to provide the long filament with wet strength, wherein can carry out or is not cured step.Carrying out being cross-linked makes polymer melt composition to be sent by extrusion nozzle and to produce long filament.In other words, cross-linking system, not prematurely by the crosslinks hydroxyl polymers in polymer melt composition, makes extrusion nozzle block, and therefore can not produce long filament.

Long filament of the present invention does not comprise the coating (coating on such as fiber, film or foam) and/or other surface treatment that are applied to the shape be pre-stored in.But in one embodiment of the invention, available cross-linking system coating of the present invention and/or surface treatment are according to long filament of the present invention.

In one example in which, the long filament prepared via polymer processing operation can under the solidification temperature of about 110 DEG C to about 215 DEG C and/or about 110 DEG C to about 200 DEG C and/or about 120 DEG C to about 195 DEG C and/or about 130 DEG C to about 185 DEG C, solidifies a period of time of about 0.01 second and/or 1 second and/or 5 seconds and/or 15 seconds to about 60 minutes and/or about 20 seconds to about 45 minutes and/or about 30 seconds to about 30 minutes.Alternative curing can comprise method of radiating as UV, electron beam, IR and other temperature-rising method.

In addition, at above-mentioned cured at room temperature or not after above-mentioned cured at room temperature, long filament also at room temperature can solidify several days.

Long filament of the present invention can comprise melt-spun filaments and/or spun-bonded continuous yarn, tubular filament, shaped filaments such as multi-lobed filament and multicomponent filaments, especially bicomponent filament.Described multicomponent filaments, especially bicomponent filament can be parallel type, sheath-core type, segmented pie, band shape, fabric of island-in-sea type configuration, or their any combination.Crust can be continuous print or discrete around core.The weight ratio of crust and core can be about 5:95 to about 95:5.Long filament of the present invention can have different geometries, and it comprises circle, ellipse, star, rectangle and other various eccentrical shape.

the non-limitative example of fibre structure

example 1-comprises the fibre structure of starch filament/wood pulp fibre

Preparation comprises the polymer melt composition of following material: 7.5%Mowiol 10-98, it can from Kuraray Co. commercially available (polyvinyl alcohol), 19%Ethylex 2035, it can from Tate & Lyle commercially available (ethoxylated starches), 19%CPI 050820-156, it can from Corn Products International commercially available (acidified starch), 0.5% sulfosuccinate surfactant is as Aerosol AOT, it can be commercially available from Cytec Industries, 0.25%Hyperfloc NF221, it can from Hychem, Inc. commercially available (polyacrylamide), 3.25% imidazolone crosslinking agent (DHEU) and 0.5% is purchased from the ammonium chloride (crosslinking accelerator) of Aldrich.As mentioned above, at about 50% solid (50%H ₂o), under, melt composition boiling is extruded from co-rotating twin screw extruder.

Then, polymer melt composition pump is drawn to a series of meltblowing die to provide plurality of threads from each spinning head, described meltblowing die becomes different angles orientation with longitudinal direction.With saturated air stream by the long filament attenuating from each spinning head to form filament layer, described filament layer is collected in top of each other, to form nonwoven substrate.The long filament of two or more filament layers shows the different orientation relative to longitudinal direction.As mentioned above, the nonwoven substrate of formation shows about 10g/m ²to about 120g/m ²basic weight.Being deposited at long filament brings with before forming nonwoven substrate, carrys out dry described long filament by convective drying.These meltblown filaments are continuous print long filaments substantially.

If use two or more spinning heads to prepare long filament source, such as by making two or more spinning heads abut against together, then the seam long filament ultimate range formed between nozzle opening formed in nozzle opening and the second spinning head of the seam long filament in the first spinning head is made to be less than 9mm and/or to be less than 7mm and/or to be less than 5mm to prepare spinneret assembly by making the first spinning head and the second spinning head adjoin.Except spinning head is adjacent, also ventilating board is used for spinneret assembly to cover the seam formed by adjacent spinning head.The object of ventilating board produces air-flow, and described air-flow avoids the long filament causing being prepared by spinneret assembly to collide with adjacent filament, and described collision can cause boning from the long filament of spinneret assembly and/or ejecta.

By hammer-mill, wood pulp fibre (can trade name roll comminution pulp starch (SSK) purchased from the southern softwood kraft of Georgia Pacific) is broken and be sent to via air blast can from the commercially available air-laid former of Dan-Web.As solid additive on surface wood pulp fibre being deposited to nonwoven substrate.

Additional polymer melt composition pump is drawn to longitudinal additional meltblowing die into about 90 ° of angular orientation to produce additional filament layer (it is for scrim), described filament layer is deposited on to be positioned between nonwoven substrate and scrim by wood pulp fibre on wood pulp fibre top, thus forms fibre structure.Scrim shows about 0.1g/m usually ²to about 10g/m ²basic weight.

Then, binder-treatment is carried out to fibre structure, wherein between nonwoven substrate and scrim, forms bonded part, wood pulp fibre is positioned between nonwoven substrate and scrim, thus form finished product fibre structure.Binder-treatment can be used to give pattern to finished fiber structure and/or described finished fiber structure can be impressed.In fibre structure preparation process, such as bonded and/or impression before, humidification can be carried out to described fibre structure.

Then described finished fiber structure is made around core convolution winding to prepare thin page sanitary tissue products.

The draw ratio that fibre structure, finished fiber structure and/or the thin page sanitary tissue products of mixing described one-tenth fibre structure show is 2 or less.

method of testing

Except as otherwise noted, all tests as herein described (comprising those and the following method of testing described in definitional part) are all carried out following sample, and described sample is 23 DEG C ± 1.0 DEG C and relative humidity is nursed one's health minimum 2 hours in the conditioning chamber of 50% ± 2% in temperature before test.Tested sample is " available cell ".As used herein, " available cell " refers to sheet, from the flat panel of coiled material, the flat panel of pre-converted and/or single-layer sheet or multilayer tablet product.All tests all to be carried out under identical environmental condition in this type of conditioning chamber.Do not test the sample with defect such as wrinkle, tear place, hole etc.For test purpose, be considered to dry-eye disease (such as " dry long filament ") by the sample carrying out nursing one's health described herein.According to the description calibration all appts of manufacturer.

basic weight method of testing

Use resolution ratio to be the ± top-loaded analytical balance of 0.001g, the stacked body for 12 available cell carries out the measurement of fibre structure basic weight.Described balance uses air bell to protect it not by air-flow and other impact disturbed.Accurate cutting punch die (measure 3.500in ± 0.0035in and take advantage of 3.500in ± 0.0035in) is for the preparation of all samples.

Use accurate cutting punch die, sample is cut into square.By the square composite of cutting to form the stacked body of 12 thickness of sample.Measure the quality of sample stacked body and record result, being accurate to 0.001g.

Basic weight is with lbs/3000ft ²or g/m ²for unit, according to following calculating:

Basic weight=(quality of stacked body)/[(in stacked body 1 foursquare area) × (square number in stacked body)]

Such as,

Basic weight (lbs/3000ft ²)=[[quality (g)/453.6 (g/lbs) of stacked body]/[12.25 (in ²)/144 (in ²/ ft ²) × 12]] × 3000

Or,

Basic weight (g/m ²quality (g)/[79.032 (cm of)=stacked body ²)/10,000 (cm ²/ m ²) × 12]

Record result is accurate to 0.1lbs/3000ft ²or 0.1g/m ².Can use and sample size is changed with similar accurate cutter mentioned above or changes, be at least 100 square inches to make the sample area in stacked body.

dry tensile strength method of testing

TENSILE STRENGTH at applied load sensor (for described load sensor, the power recorded is in 10% to 90% of the load sensor limit), the constant speed with computer interface extends the upper measurement of tensile tester (suitable apparatus is the EJAVantage purchased from Thwing-Albert Instrument Co. (Wet Berlin, NJ)).Movable (top) and fixing (bottom) pneumatic grips are all furnished with stainless steel light face holder, and described holder has the design (Thwing-Albert item#733GC) being suitable for test 1 inch of wide sheet material.The air pressure of about 60psi is provided to fixture.

Eight of fibre structure available cell are divided into two stacked bodies, every stacked body four available cell.Available cell in each stacked body is relative to longitudinal direction (MD) and horizontal (CD) as one man orientation.One of stacked body is specified for testing in the vertical, and another is tested in the horizontal.Use one inch of accurate cutter (Thwing Albert JDC-1-10 or analog) to obtain horizontal stacked body, and cut out a wide bar stacked body (long size in the horizontal) taking advantage of 3 – 4in long of 1.00in ± 0.01in.In the same way, cut remaining stacked body (the long size of bar is in the vertical) in the vertical, to obtain 8 samples altogether, four Cross slats and four longitudinal bars.Each bar to be tested all has the thickness of an available cell, and will be seen as a sample body be used for test.

To tensile tester programming to carry out extension test, collect power and extension data with the acquisition rate of 20Hz, chuck rises till sample fracture with the speed of 2.00in/min (5.08cm/min) therebetween.Break sensitivity is set as 80%, that is, stops this test when measured power is down to 20% of peak-peak power, make thereafter chuck return back to its initial position.

To space and be set as 1.00 inches.By chuck and load sensor zero.In upper and lower opening holder, insert sample, make each holder comprise the sample length of at least 0.5 inch.Sample vertically aligns in upper lower clamp, then closed upper holder.Whether verification sample aligns, then closed lower holder.Sample between holder should be quite straight, and load sensor has the power being no more than 5.0g.Start tensile tester and start Data Collection.For all four transverse directions and four longitudinal samples, carry out retest in a similar fashion.

Software is programmed to be calculated as follows extension (in) curve by the power (g) constructed:

TENSILE STRENGTH be maximum cutting edge of a knife or a sword value power (g) divided by specimen width (1in), and in units of g/in record, be accurate to 1g/in.

Carry out TENSILE STRENGTH (g/in) to four single samples of transverse direction and four single samples of longitudinal direction to calculate.Calculate the mean value of each independent parameter of horizontal and vertical sample.

Calculate:

Draw ratio=longitudinal tensile strength (g/in)/transverse tensile strength (g/in)

Dimension disclosed herein is unintelligible for being strictly limited to quoted exact value with value.On the contrary, except as otherwise noted, each such dimension be intended to represent described in value and the scope that is functionally equal to around this value.Such as, disclosed dimension " 40mm " is intended to represent " about 40mm ".

Unless expressly excluded, or in other words limit to some extent, each file quoted herein, comprise any cross reference or Patents or patent application, be incorporated in full herein with way of reference all accordingly.Quoting of any document is not all to recognize that it is the prior art of disclosed herein or claimed any invention or admit that it independently or propose, advise or disclose any this type of in the mode of any combination with other one or more bibliography any and invent.In addition, if any implication of term or definition and any implication of same term in any document be incorporated herein by reference or define is conflicted mutually in this document, be as the criterion with the implication or definition of giving that term in this document.

Although illustrate and describe specific embodiment of the present invention, those skilled in the art be it is evident that, can make without departing from the spirit and scope of the present invention many other change and modification.Therefore, be intended to comprise all these belonging in the scope of the invention in claims change and modification.

Claims

1. comprise a fibre structure for plurality of threads, described long filament comprises one or more polysaccharide, wherein said fibre structure show as the draw ratio measured by dry tensile strength method of testing as herein described be 2 or less.

2. fibre structure according to claim 1, at least one in one or more polysaccharide wherein said is selected from: starch, starch derivatives, starch copolymer, chitosan, chitosan derivative, chitosan copolymer, cellulose, cellulose derivative, cellulose copolymer, hemicellulose, hemicellulose derivative, hemicellulose copolymer, and their mixture, at least one preferably in one or more polysaccharide wherein said is selected from: starch, starch derivatives, starch copolymer, and their mixture, more preferably wherein said at least one polysaccharide comprises starch or the acidified starch of ethoxylation.

3. fibre structure according to claim 1 and 2, at least one in wherein said long filament also comprises and is selected from following hydroxy polymer: polyvinyl alcohol, polyvinyl alcohol derivative, polyvinyl alcohol copolymer, natural gum, araban, galactan, protein and their mixture.

4., according to fibre structure in any one of the preceding claims wherein, at least one in wherein said long filament also comprises and is selected from following polymer and their mixture: polyacrylamide and derivative thereof; Polyacrylic acid, polymethylacrylic acid and their ester; Polymine; The copolymer be made up of the mixture of the monomer of aforementioned polymer; Preferably wherein said polymers exhibit goes out to be greater than the weight average molecular weight of 500,000g/mol, and more preferably wherein said polymer comprises polyacrylamide.

5., according to fibre structure in any one of the preceding claims wherein, at least one also comprises surfactant in wherein said long filament, preferably wherein said surfactant comprises sulfosuccinate surfactant.

6., according to fibre structure in any one of the preceding claims wherein, wherein said fibre structure shows 10g/m ²to 120g/m ²basic weight.

7., according to fibre structure in any one of the preceding claims wherein, wherein said fibre structure also comprises one or more solid additives.

8. according to fibre structure in any one of the preceding claims wherein, at least one in one or more solid additives wherein said comprises fiber, preferably wherein said fiber comprises paper pulp fiber, more preferably wherein said paper pulp fiber is selected from hardwood pulp fibers, softwood pulp fibers and their mixture, and even more preferably wherein said paper pulp fiber comprises eucalyptus pulp fiber or through chemically treated paper pulp fiber.

9. fibre structure according to claim 7, one or more in wherein said solid additive are present on the surface of described fibre structure.

10. fibre structure according to claim 9, wherein said fibre structure also comprises the scrim on the surface being connected to described fibre structure, described solid additive is made to be positioned between the surface of described scrim and described fibre structure, more preferably wherein said scrim material is bonded to the surface of described fibre structure at one or more bonded part place, and even more preferably wherein said one or more bonded part comprises hot adhesion or pressure bonding.

11. fibre structures according to claim 10, wherein said scrim material is bonded to the surface of described fibre structure by multiple discrete bonded part.

12. according to fibre structure in any one of the preceding claims wherein, and wherein said fibre structure is what impress.

13. according to fibre structure in any one of the preceding claims wherein, and wherein said fibre structure shows and is less than 0.60g/cm ³density.

14. 1 kinds of thin page sanitary tissue products of single or multiple lift, it comprises according to fibre structure in any one of the preceding claims wherein.

15. 1 kinds, for the preparation of the method according to fibre structure in any one of the preceding claims wherein, said method comprising the steps of:

A. plurality of threads is provided from long filament source; And

B. on gathering-device, collect described long filament to form fibre structure, described fibre structure is shown as the draw ratio measured by draw ratio method of testing as herein described be 2 or less, preferably wherein said method is further comprising the steps of:

C. provide many kinds of solids additive from solid additive source, make described solid additive be collected on the surface of described fibre structure, more preferably wherein said method is further comprising the steps of:

D. scrim material is provided; And

E. described scrim material is bonded to the surface of described fibre structure, described solid additive is positioned between the surface of described scrim material and described fibre structure.