CN1754024A

CN1754024A - Fibrous structure and process for making same

Info

Publication number: CN1754024A
Application number: CNA2004800050908A
Authority: CN
Inventors: D·A·埃尔南德斯·穆尼奥瓦; K·D·文森; D·G·卡瓦莱瓦; P·K·爱德华兹; J·A·马尼福尔德
Original assignee: Procter and Gamble Ltd
Current assignee: Procter and Gamble Ltd; Procter and Gamble Co
Priority date: 2003-02-25
Filing date: 2004-02-25
Publication date: 2006-03-29
Anticipated expiration: 2024-02-25
Also published as: CA2516924A1; DE602004029766D1; CA2756555A1; US20040163782A1; AU2004214913A1; CN100523372C; MXPA05008025A; EP1597433A1; CA2516924C; JP2006518814A; WO2004076745A1; EP1597433B1; ATE486168T1; CL2004000363A1

Abstract

Through-air dried (''TAD'') fibrous structures, especially TAD fibrous structures incorporated into sanitary tissue products, that comprise a short fiber furnish having a length of from about 0.4 mm to about 1.2 mm and a low coarseness of from about 3.0 mg/100 m to about 7.5 mg/100 m, and a physical property ingredient selected from the group consisting of permanent wet strength resins, chemical softeners and mixtures thereof, and processes for making such TAD fibrous structures are provided.

Description

Fibre structure and preparation method thereof

Invention field

The method that the present invention relates to fibre structure and prepare this type of fibre structure, the invention particularly relates to the fibre structure that is incorporated into the aeration-drying that comprises the staple fibre batching in thin page or leaf sanitary tissue products such as face tissue, toilet paper and the paper handkerchief, the length of the staple fibre that this batching comprises is extremely about 1.2mm of about 0.4mm, and rugosity is that about 3.0mg/100m is to about 7.5mg/100m.

Background of invention

Typically, the fibre structure that is used for thin page or leaf sanitary tissue products comprises two or more fiber furnish.This type of fibre structure typically comprises a kind of batching that is made of relative long fiber (being the fiber that the length weight averaged fiber length surpasses about 2mm).This batching is intended in thin page or leaf sanitary tissue products inside as fortifier or generation intensity.In addition, this fibre structure also typically comprises at least a short relatively fiber furnish, and promptly fibre length is less than the fiber of about 1.2mm.Because these staple fibres are not bonding relatively, so they have improved the flexibility of thin page or leaf sanitary tissue products.Unbonded fiber has free-end, and it can give structure velvety smoothness.This VELVET sees also the United States Patent (USP) 4,300,981 of authorizing Carstens like the disclosure of structure, and it is incorporated herein by reference.

Yet, viewpoint from the staple fibre of a certain minimum average B configuration fibre length of needs batching, with from respect to the maximum viewpoint that comprises speed being arranged than long fiber batching or the batching staple fibre batching that is used in the hygienic tissue paper structure, the use of staple fibre is restricted this point and knows for those skilled in the art.This restriction is because of the such fact of strength loss.Finally convert the fiber web that approaches the page or leaf sanitary tissue products to for manufacturer can be handled, it is essential having a certain amount of intensity in the product.In order for example to prevent/suppress stick fingers bankruptcy product between the operating period, it also is essential providing a certain amount of intensity for the user of finished product.

When making thin-paged paper products with so-called TAD papermaking process, the strength development problem is enhanced.This is because when the surface that tissue webs is carried the Yankee drying machine was pushed, strength development was modified.In some aeration-drying methods, extruding can surpass 100% area (being typically conventional non-TAD method) to being less than 50% from extruding, more preferably changes even less than 40% of surface.Although strength development is shockingly good, its conventional relatively web manufacture must suffer damage.In these more external aeration-drying methods, the Yankee drying machine is removed fully, and this has eliminated the parts that produce intensity significantly fully.

The staple fibre batching that current field will be used for the aeration-drying method is restricted to greater than about 0.75mm.

The present inventor has now found that, when with low rugosity with when comprising the rerum natura conditioning agent of permanent wet strength agent or chemical softener, surprisingly low fibre length (promptly, fiber less than about 1.2mm) can be used for producing, and can use the tissue paper structures of aeration-drying, realize the flexibility of benefiting from this fiber that does not above predict.

There is not the prior art document to propose to comprise that (length of the staple fibre that this batching comprises is that about 0.4mm is to about 1.2mm to the staple fibre batching, rugosity is about 3.0mg/100m about 7.5mg/100m extremely) the fibre structure of aeration-drying, and the rerum natura composition that is selected from permanent wet strength resin, chemical softener and their mixture.

Summary of the invention

The invention provides the fibre structure of the aeration-drying that comprises the staple fibre batching and the rerum natura composition that is selected from permanent wet strength resin, chemical softener and their mixture.

In one aspect of the invention, provide and comprised that (length of the staple fibre that this batching comprises is that about 0.4mm is to about 1.2mm to the staple fibre batching, rugosity is about 3.0mg/100m about 7.5mg/100m extremely) the fibre structure of aeration-drying, and the rerum natura composition that is selected from permanent wet strength resin, chemical softener and their mixture.

In another aspect of this invention, the paper products that comprise the fibre structure that comprises aeration-drying are as described in the present invention provided.

In another aspect of this invention, provide the thin page or leaf sanitary tissue products of the fibre structure that comprises aeration-drying, wherein thin page or leaf sanitary tissue products is selected from tissue product, sanitary tissue products, towel products and their mixture.

In another aspect of this invention, provide the method for making the fibre structure of aeration-drying, this method may further comprise the steps:

A. prepare the fiber furnish that comprises that staple fibre is prepared burden, the length of the staple fibre that this batching comprises is extremely about 1.2mm of about 0.4mm, and rugosity is extremely about 7.5mg/100m of about 3.0mg/100m, prepares burden by staple fibre is mixed the formation staple fibre with water;

B. fiber furnish is deposited on the porose profiled surface to form the embryo fiber web;

C. the permanent wet strength resin is added on fiber furnish and/or the embryo fiber web; With

D. the described embryo fiber web of aeration-drying make to form the fibre structure of aeration-drying.

Even in another aspect of this invention, provide the method for preparation fibre structure aeration-drying, that comprise chemical softener, this method may further comprise the steps:

C. the described embryo fiber web of aeration-drying make to form the fibre structure of aeration-drying; With

Thereby the fibre structure that d. chemical softener is applied to fiber furnish and/or embryo fiber web and/or aeration-drying forms fibre structure aeration-drying, that comprise chemical softener.

Detailed Description Of The Invention

Term used herein " fiber " is meant elongated particle, and its apparent length is considerably beyond its apparent widths, and promptly the ratio of length and diameter is at least about 10.More particularly, term used herein " fiber " is meant paper fibre.The present invention imagines use various paper fibres, for example natural fabric or synthetic fiber or any other suitable fiber and their any combination.Be applicable to that paper fibre of the present invention comprises the cellulose fibre that is commonly referred to wood pulp fibre.Wood pulp applicatory comprises chemical wood pulp, and for example Kraft (brown paper) wood pulp, sulphite wood pulp and sulfate wood pulp and groundwood pulp comprise for example thermodynamics wood pulp of wood fragments slurry, thermodynamics wood pulp and chemical modification.Yet chemical wood pulp may be preferred, because it can give tissue sheets by its manufacturing with outstanding soft touch.Also can use wood pulp derived from deciduous tree (also referring to " hardwood " hereinafter) and coniferous tree (also referring to " cork " hereinafter).Hardwood and cork fibrous can be mixed or alternatively with bedded deposit, thereby form the stratiform fiber web.United States Patent (USP) 4,300,981 and United States Patent (USP) 3,994,771 be introduced into this paper for your guidance, with the hardwood and the cork fibrous of open stratiform.Also can be applicable to of the present invention is that it can comprise arbitrary or all mentioned kinds and other non-fibrous material, as is used to promote the filler and the adhesive of initial papermaking from the fiber that reclaims paper.

Except various wood pulp fibres, other cellulose fibre also can be used for the present invention as velveteen, artificial silk and bagasse.Also can use synthetic fiber, for example polymer fiber.Can use elastomer polymer, polypropylene, polyethylene, polyester, polyolefin and nylon.Can make these polymer fibers by spunbond technology, melt-blown process and other appropriate method known in the art.

Although also can use the dispersions in liquids beyond dewatering, the embryo net is typically made by the aqueous dispersions of paper fibre.Is about 0.1% to about 0.3% carrier liquid with fiber dispersion in denseness.It is believed that the present invention also applicable to the forming operation of humidity, fiber dispersion is in denseness is lower than about 50% carrier fluid, more preferably less than about 10% in this operation.

" thin page or leaf sanitary tissue products " used herein is meant the paper web of softness, low-density (promptly less than about 0.15g/cm3), it can be used as urine or clean wiping instrument (toilet paper) greatly after an action of the bowels, is used for otorhinolaryngology excreta (face tissue), and multi-functional absorption and cleaning purposes (absorbent napkin).

" weight average molecular weight " used herein is meant that described rules are present in Colloids and Surfaces A.Physico Chemical﹠amp according to the weight average molecular weight of rules with gel permeation chromatography; Engineering Aspects, the 162nd volume,, the 107th to 121 page in 2000.

" wet burst strength " used herein is meant when fibre structure and/or mixes wetting and the measuring of its endergonic ability when standing distortion perpendicular to fibre structure and/or paper products plane of the paper products of fibre structure.Can use to be commercially available in Thwing-Albert Instrument Company, Philadelphia, the Thwing-Albert Burst Tester Cat of PA measures wet burst strength No. 177, and these instrument and equipment have the force cell of 2000g.

By taking out eight (8) individual fibre structures as described in the present invention and four couple that they are divided into every pair two (2) individual sample being measured wet burst strength.Using scissors to cut off sample, make sample vertically be about 228mm, laterally be about 114mm, all is two thickness that become article unit.At first, with clip sample heap being tied makes sample experience two (2) hours, and the other end of piling with anchor clamps " fan " sample in the forced ventilation baking oven of 107 ℃ (± 3 ℃) 5 minutes (± 10 seconds).After heating finishes, take out the sample heap from baking oven, minimum cooling is three (3) minutes before the test.Get next sample strip, hold the narrow horizontal edge of sample, the sample center is immersed in the plate that about 25mm distilled water is housed.Allow sample four (4) (± 0.5) under water second.Take out sample, hold taking sample draining three (3) (± 0.5) second, allow water laterally flow out.Continue test after the draining at once.The sample outer surface is placed in the low ring of sample fixture of bursting strength tester, so that allow the wetted portions of sample cover fully on the rough surface of sample retainer ring up.If microgroove abandons sample, and repeat test with fresh sample.When sample after being in place on the lower sample retainer ring, open the ring of going up that switch reduces the bursting strength tester.Now, the sample positioner has firmly fixed specimen.Begin the test of breaking immediately by moment by the start button on the bursting strength tester.Depression bar begins to rise towards the wetting surface of sample.In the moment that sample is torn or broken, the record full-scale reading.Depression bar will fall back automatically, be back to initial position.Use other three (3) individual samples, repeat said procedure, carry out four (4) inferior tests altogether, i.e. four (4) inferior repeated experiments.The record result is the mean value of four (4) inferior repeated experiments, is accurate to gram.

" quantitatively " used herein is the weight of per unit area sample, and note is made 1bs/3000ft ²Or g/m ²Quantitative following measurement: prepare one or more particular area (m ²) sample, be weighing fibrous structure sample and/or comprise the paper products of described fibre structure as described in the present invention on the top-loading balance of 0.01g in minimum resolution then.Be not subjected to the influence of air-flow and other interference with air bell protection balance.When becoming constant, writes down the balance reading this weight.Average area (the m of average weight (g) and sample ²).With the average area (m of average weight (g) divided by sample ²) calculate quantitatively (g/m ²).

" vertically " used herein or " MD " are meant the direction that is parallel to the flow direction of fibre structure on paper machine and/or production equipment.

" laterally " used herein or " CD " are meant perpendicular to fibre structure and/or comprise the longitudinally direction of paper products in same plane of this fibre structure.

Fibre structure of the present invention and/or comprise that " total dry tensile strength " or " TDT " of the paper products of this fibre structure measures according to the following steps.Provide one (1) inch to take advantage of five (5) inches (fibre structure bands of 2.5cm * 12.7cm) and/or comprise the paper products band of this fibre structure.With this band be placed at controlled condition be temperature be 73 ± 4 (about 28 ℃ ± 2.2 ℃) and relative humidity be in 50% ± 10% the room the electronic tensile verifier (model is 1122, is commercially available in InstronCorp., Canton, Massachusetts) on.The crosshead speed of tensile tester is 2.0 inches per minutes (about 5.1cm/ minutes), and gauge length is 4.0 inches (about 10.2cm).TDT is the MD of paper tape and the arithmetic sum total of CD TENSILE STRENGTH.

" thickness " used herein is meant the macroscopic thickness of sample.The thickness of sample of fibre structure is following as described in the present invention determines: make its size greater than loading the footing loading surface fibrous structure sample incision, wherein load the long-pending about 20.26cm of being of circular surface of footing loading surface ²(3.14in ²).Sample is kept in detention between horizontal plane and loading footing loading surface.The confined pressure that loading footing loading surface applies to sample is 15.5g/cm ²(about 0.21psi).Thickness is the gained gap between plane and the loading footing loading surface.This measuring can (model be II, and available from Thwing-Albert Instrument Company, Philadelphia PA) go up to realize at VIR electrical thickness analyzer.Inferior to thickness measure repetition and record at least five (5) so that calculate average thickness.Record unit as a result is a millimeter.

" apparent density " used herein or " density " are meant with the proper transformation that the is incorporated herein sample after divided by thickness quantitative.The unit of apparent density used herein is g/cm ³

Fibre structure and/or comprise that " flexibility " of the paper products of this fibre structure measure as follows as described in the present invention.It is desirable to, before the flexibility test, should handle testing sample according to Tappi Method#T4020M-88.At this moment, under the temperature range of 10% to 35% relative humidity content and 22 ℃ to 40 ℃ with sample pretreatment 24 hours.After the pre-treatment step, should be under the temperature range of 48% to 52% relative humidity and 22 ℃ to 24 ℃ with sample treatment 24 hours.It is desirable to, flexibility appraisal group check should occur in the scope in the steady temperature that limited and humidity room.If infeasible like this, then all samples (comprising tester) should experience identical environmental exposure condition.

The flexibility test is carried out as paired comparisons, form class is similar to described in " Manual on SensoryTesting Methods " (ASTM Special Technical Publication 434), and nineteen sixty-eight is announced and is incorporated herein by reference by American Society For Testing and Materials.Use so-called pairing difference test flexibility to be assessed by the subjective testing evaluation.Standard outside this method use test material itself.Be the tactilely-perceptible flexibility, the existing way of two samples need make individuality can't see sample, and requires individuality to select one of them on the basis of sense of touch flexibility.Test result (PSU) is reported with so-called " scoring unit of appraisal group ".As for for obtaining the flexibility test of this paper, need carry out the check of many flexibilities appraisal group with the flexibility data of PSU report.In each test, require ten experienced flexibility appraisers to the three relative flexibility graduation of forming sample.Every surveyor identifies a pair of in the paired samples at every turn: a sample of every centering is designated as X, and another is Y.In brief, relative its paired Y sample of each X sample is classified as follows:

1. if be accredited as may be more soft a little than Y for X, then provide grade and be positive one, if be accredited as may be more soft a little than X for Y, then provide grade and be negative one;

If X be accredited as really more soft a little than Y, then provide grade and be positive two, more soft a little than X really if Y is accredited as, then provide grade and be negative two;

3. if X is accredited as many than the Y softness, then provide the X grade and be positive three, if Y is accredited as many than the X softness, then provides grade and be negative three; And last:

If X be accredited as more many than Y softness, then provide the X grade and be positive four, more many if Y is accredited as than X softness, then provide grade and be negative 4.

Average and value unit of institute is PSU with grade.Think that the gained data are the result of appraisal group's check.If evaluation is right more than a sample, then according to their grade all samples is arranged pressing rank order by the pairing statistical analysis.Then, owing to need count the sample of standard and provide zero PSU value being chosen as zero-base, grade point rises or decline.When other sample is measured with its relative grade of counting standard about zero-base, they then have on the occasion of or negative value.Carrying out appraisal group's check and average number of times will make about 0.2PSU represent the subjective significant difference that perceives flexibility.

Term used herein " layer " or " multiple layer " be meant single fibre structure can randomly be arranged to other layer basically in abutting connection with, aspectant relation, form multi-ply fibrous structure.Also imagining single fibre structure can form two " layers " or many " layers " effectively for example self is folding.

Article used herein " one " (" anion surfactant " for example used herein or " fiber ") is understood to mean and is subjected to one or more these materials claims protection or that describe.

Except as otherwise noted, all percentages and ratio are all by weight.Except as otherwise noted, all percentages and ratio are all based on the total composition meter.

Except as otherwise noted, all components or composition levels all are the active quantities about this component or composition, and do not comprise the impurity that may exist in the commercially available source, for example residual solvent or byproduct.

The TAD fibre structure:

The fiber furnish that the fibre structure of aeration-drying of the present invention can comprise comprises the staple fibre batching, and the length of the staple fibre that this batching comprises is extremely about 1.2mm of about 0.4mm, and rugosity is that about 3.0mg/100m is to about 7.5mg/100m.

Except staple fibre, the TAD fibre structure also can comprise wet-strength resins, is preferably the permanent wet strength resin.In addition, except staple fibre, the TAD fibre structure also can comprise chemical softener.The fiber furnish that is used to prepare the fibre structure of aeration-drying can further comprise the permanent wet strength resin.

Length for about 0.4mm to about 1.2mm and rugosity be about 3.0mg/100m extremely the staple fibre of about 7.5mg/100m can be present in the fibre structure of aeration-drying, weight content by described whole fibers is at least 10%, and/or by the weight content of described whole fibers be aeration-drying fibre structure at least 20% to the highest by 100%.

Except staple fibre, the fibre structure of aeration-drying of the present invention also can comprise optional member, and it will be described in greater detail below.

Except the staple fibre batching, fiber furnish of the present invention also can further comprise the long fiber batching, and this long fiber batching comprises the long fiber of length greater than 1.2mm.These long stapled non-limiting examples comprise the fiber derived from wood pulp.Can use other fiber that cellulosic fibrous pulp is arranged such as velveteen, bagasses etc., and intention is included in it in category of the present invention.Also synthetic fiber such as artificial silk, polyethylene and polypropylene fibre and native cellulose fibre can be united use.Available a kind of exemplary polyethylene fiber is available from Hercules company (Wilmington, PULPEX Del.) (R).

Wood pulp applicatory comprises chemical wood pulp, for example Kraft (brown paper) wood pulp (especially northern softwood kraft (" NSK ") wood pulp), sulphite wood pulp and sulfate wood pulp, and groundwood pulp, comprise for example thermodynamics wood pulp of wood fragments slurry, thermodynamics wood pulp and chemical modification.Yet preferred chemical wood pulp is because they can be given by its tissue sheets that makes with flexibility sense of touch preferably.Also can utilize wood pulp derived from deciduous tree (also referring to " hardwood " hereinafter) and coniferous tree (also referring to " cork " hereinafter).Also can be used for of the present invention is that it can comprise arbitrary or all mentioned kinds and other non-fibrous material, as is used to promote the filler and the adhesive of initial papermaking derived from the fiber that reclaims paper.

Except wood pulp, plant origin such as grain (being starch) also can be produced/be attained to fiber.

The fibre structure of aeration-drying of the present invention can be used for paper, and especially hygienic tissue paper product generally includes but is not limited to conventional felt and presses tissue paper, high stacking volume pattern-densified type tissue paper and the uncompacted tissue paper of high stacking volume.Tissue paper can be homogenization or sandwich construction; And the thin-paged paper products that makes thus can be the single or multiple lift structure.Tissue paper can have quantitatively between about 10g/m ²To about 65g/m ²Between, density is about 0.6g/cc or littler.

The method of conventional pressed tissue paper and this paper of preparation is well known in the art.This paper typically prepares by the papermaking batching is deposited on the porose plastic metal wire (often being called fourdrinier wire in this area).In case batching is deposited on the plastic metal wire, just can be referred to as fiber web.Make the fiber web dehydration by extrusion fiber net or high temperature drying.Prepare fibroreticulate detailed technology and exemplary apparatus is that those skilled in the art is known according to the method for describing just now.In a typical method, the head box that the slurry ingredients of low denseness is provided in to pressurize.Head box has an opening, is used to send slurry ingredients and is deposited on thinly on the fourdrinier wire to form wetting fiber web.By vacuum dehydration and further dry (passing through extrusion operation) the fiber web typical case is dewatered to fiber consistency (based on whole fibroreticulate weight) between about 7% and about 25% then, wherein fiber web will stand the pressure that reverse mechanical component (as the cylindrical shape roll) produces.Can utilize the further extruding and dry of fiber web after steam drum apparatus known in the art such as Yankee drying machine will dewater.Can on the Yankee drying machine, produce pressure by mechanical part such as reverse cylindrical drum extrusion fiber net.A plurality of Yankee dryer drum can be used, additonal pressure can be randomly between rotating cylinder, produced thus.After this tissue paper structures that forms is called tissue paper structures conventional, compacting.Because moist and subsequently under compressive state during drying when fiber, whole fiber web will stand mechanical pressure substantially, so this scraps of paper are considered to compacting.

The TAD fibre structure can prepare with producing fibroreticulate fiber furnish of individual layer embryo or the fibroreticulate fiber furnish of production multilayer embryo.One or more staple fibres can be present in and have in one or more long stapled fiber furnish.In addition, one or more staple fibres can be present in and have in one or more long stapled batchings layers.

The fibre structure of aeration-drying of the present invention and/or comprise that the paper products of the fibre structure of this aeration-drying can have quantitatively be about 12g/m ²To about 120g/m ², and/or about 14g/m ²To about 80g/m ², and/or about 20g/m ²To about 60g/m ²

The fibre structure of aeration-drying of the present invention and/or comprise that the paper products of the fibre structure of this aeration-drying can have, total dry tensile strength is greater than about 381g/cm (150g/in), and/or about 508g/cm (200g/in) is to about 2540g/cm (1000g/in), and/or about 635g/cm (250g/in) about 2159g/cm (850g/in) extremely.

The fibre structure of aeration-drying of the present invention and/or comprise that wet burst strength that the paper products of the fibre structure of this aeration-drying can have is greater than about 63.5g/cm (25g/in), and/or about 76.2g/cm (30g/in) is to about 508g/cm (200g/in), and/or about 381g/cm (150g/in) about 1270g/cm (500g/in) extremely.

Staple fibre:

The length that staple fibre of the present invention can have is that about 0.4mm is to about 1.2mm, and/or about 0.5mm is to about 0.75mm, and/or about 0.6mm is to about 0.7mm, and rugosity is that about 3.0mg/100m is to about 7.5mg/100m, and/or about 5.0mg/100m is to about 7.5mg/100m, and/or about 6.0mg/100m about 7.0mg/100m extremely.

Staple fibre of the present invention can be derived from the fiber source that is selected from Acacia, eucalyptus, maple, Oak Tree, white poplar, birch, cottonwood, alder, Ash tree, cherry tree, elm, Chinese walnut, willow, rubber tree, walnut, locust tree, outstanding tinkling of pieces of jade wood, beech tree, Chinese catalpa, yellow camphor tree, gumhar wood, silk tree, anthocephalus chinensis, lily magnolia, bagasse, flax, hemp, mestha and their mixture.

In one embodiment, staple fibre is derived from tropical hard wood.

In another embodiment, staple fibre is derived from the fiber source that is selected from Acacia, eucalyptus, gumhar wood and their mixture.

In another embodiment, staple fibre is derived from the fiber source that is selected from Acacia, gumhar wood and their mixture.

In another embodiment, staple fibre is derived from Acacia.

The non-limiting example of suitable staple-fiber is commercially available in the PT Tel of Indonesia, and the length that this fiber has is extremely about 1.2mm of about 0.4mm, and rugosity is that about 3.0mg/100m is to about 7.5mg/100m.

Staple fibre of the present invention can comprise cellulose and/or hemicellulose.Preferably, this fibre bag cellulose.

The length of staple fibre and rugosity can be used and be commercially available in Metso Automation, and the Kajaani FiberLab Fiber Analyzer of KajaaniFinland measures.Fibre length used herein is defined as " length weight averaged fiber length ".The description details of the unit of providing be used to reach the prescription of this average.Yet being used to of recommendation measured basic identical that the method for the fibre length of fiber sample and rugosity and Fiber Lab manufacturer describe in detail.Low a little to the consistency ratio manufacturer recommendation of FiberLab of feeding of recommending is because provide more reliable operation like this.Describe in detail as this paper, the staple fibre batching should be diluted to 0.02% to 0.04% feeding to instrument.Describe in detail as this paper, the long fiber batching should be diluted to 0.15% to 0.30%.Alternatively, (as IntegratedPaper Services, Appleton is Wisconsin) to measure the length and the rugosity of staple fibre in contract laboratory that can be by staple fibre being delivered to the outside.

The permanent wet strength resin

The fibre structure of aeration-drying of the present invention can comprise the permanent wet strength resin.The permanent wet strength resin can be present in the fiber furnish, especially is present in the staple fibre batching of the fibre structure that is used to form aeration-drying, and/or can deposit on the embryo fiber web before the fibroreticulate aeration-drying of embryo.

The loss that the permanent wet strength resin is used for controlling depilation and offsets any TENSILE STRENGTH that may be produced by any chemical softener that adds fibre structure to.In addition, the permanent wet strength resin is given fibre structure or is mixed paper products one specific character of fibre structure, thereby when it was placed in the water-bearing media, through a period of time, its maintenance had the main part of its initial wet intensity.

The non-limiting example of permanent wet strength resin comprises: polyamide-epichlorohydrin resins, polyacrylamide resin, butadiene styrene resin, insoluble polyvinyl alcohol resin, urea formaldehyde resin, polyethylene imine resin, chitosan resin and their mixture.Preferably, the permanent wet strength resin is selected from polyamide-epichlorohydrin resins, polyacrylamide resin and their mixture.

Polyamide-epichlorohydrin resins is a cationic wet strength resins, has found that it has specific use.This resinoid of adequate types is described in following United States Patent (USP): be published on October 24th, 1972 3,700,623 and be published in 3,772,076 of on November 13rd, 1973, these two pieces of patents are all authorized Keim and are incorporated herein by reference.A commercially available source of available polyamide-epichlorohydrin resins is Hercules Inc., Wilmington, and Del., it is with trade mark KYMENE ^557H sells this resinoid.

Found that also polyacrylamide resin can be used as wet-strength resins.These resins are described in following United States Patent (USP): announce 19,3,556,932 and 1971 on the January of authorizing people such as Coscia of announcing on January 19th, 1971 authorizes people's such as Williams 3,556,933, and these two pieces of patents are incorporated herein by reference.A commercially available source of polyacrylamide resin is Stanford, the CYTEC Co. of Conn. its with trade mark PAREZ ^631NC sells this resinoid.Also spendable in the present invention other water-soluble cationic resin is ureaformaldehyde and melamine resin.

Chemical softener:

The fibre structure of aeration-drying of the present invention can comprise chemical softener.

Term used herein " chemical softener " is meant and has improved by holding special paper products and wiping any chemical composition of sense of touch of the user institute perception of skin with it.Though flexibility slightly needs for the toweling goods, for face tissue and toilet paper, flexibility is the character that is even more important.This type of palpable flexibility is characterised in that, but is not limited to, and as if frictional property, pliability and smoothness and subjective description information are the sensation as smooth, VELVET, silk or the flannel.

Chemical softener is any chemical composition that can give the thin paper smooth feeling.Only be exemplary purpose, this comprises basic wax (as paraffin and beeswax), oil (as mineral oil and silicone oil), silicone gel and vaseline and more complicated lubricant and emollient (as the compound (having functional group such as amine, acid, pure and mild ester) that has quaternary ammonium compound, the functional siloxanes of long (C10-C22) hydrocarbyl chain and have long (C10-C22) hydrocarbyl chain).

The of the prior art research field relevant with chemical softener taked two kinds of approach.Article one, approach is characterised in that in the forming process of tissue webs by adding softening agent: add noticeable composition (being added in the paper pulp near paper machine) in the final drum paper pulp that forms tissue webs, perhaps when moistening paper web is positioned on the fourdrinier machine cloth of papermaking equipment or the dryer cloth, be added to moistening paper web.

Second kind of approach is characterised in that at paper web and partially or completely after the drying, adds chemical softener in tissue webs.Method applicatory can be incorporated in the papermaking operation, for example can before being wound to paper bowl, embryo fiber web and/or dried fibres structure be sprayed on it, extrude (especially extruding) to embryo fiber web and/or dried fibres structure, and/or intaglio printing is to embryo fiber web and/or dried fibres structure by slit.

The example technique relevant with the front approach (be characterised in that before tissue paper is fitted into fiber web chemical softener is added on it) comprises authorized the United States Patent (USP) 5 of Phan and Trokhan on November 23rd, 1993,264,082, this patent is incorporated herein by reference.Found that these methods can be widely used in the industry, especially reduced intensity when (otherwise it can be present in the paper) when needs, and when paper technology especially crease operate enough firm when allowing the mixing of adherence inhibitor.

With at the tissue webs shaping chemical softener is added into the relevant further example technique of tissue webs and comprises the United States Patent (USP) 5,059,282 of authorizing people such as Ampulski on October 22nd, 1991, this patent is incorporated herein by reference.The patent disclosure of Ampulski polysiloxane compound is added into the method for wet tissue webs (the optimum fiber denseness is between about 20% and about 35%).This method has been represented in some aspects than chemicals is added in the slurries bucket of supplying with paper machine and has been made progress.For example, this class methods target is to be applied on the web surface, this with distribution of additives is formed contrast to all fibres of batching.

Considerable technology has been designed to chemical softener is applied to method or so-called dry terminal at paper machine on the paper web of drying, or in the independent conversion continue the papermaking step after is operated.The example technique in this field comprises: the United States Patent (USP) 5 of authorizing people such as Ampulski on June 1st, 1993,215,626, authorized people's such as Ampulski United States Patent (USP) 5 on September 21st, 1993,246,545, authorized people's such as Warner United States Patent (USP) 5 on June 11st, 1996,525,345, all patents are incorporated herein by reference.United States Patent (USP) 5,215,626 disclose by using the method that polysiloxanes to dry fibrous web prepares soft tissue paper.United States Patent (USP) 5,246,545 patent disclosures utilize the similar approach add thermal transfer surface.At last, the Warner patent disclosure comprise roller coating and the application process of extruding, be used for the specific group compound is applied to the surface of dried tissue webs.

Especially preferred chemical tendering composition is described in further detail as follows:

I. Quaternary ammonium softener

Preferably, be suitable for having following formula as the quaternary ammonium compound of chemical softener of the present invention:

(R ¹) _4-m-N+-[R ²] _mX ^-

Wherein:

M is 1 to 3; Each R ¹Be C independently ₁-C ₆Alkyl, hydroxyalkyl, alkyl or substituted hydrocarbon radical, alkoxyl, benzyl or its mixture; Each R ²Be C independently ₁₄-C ₂₂Alkyl, hydroxyalkyl, alkyl or substituted hydrocarbon radical, alkoxyl, benzyl or its mixture; And X ^-For being applicable to the compatible anion of any softening agent of the present invention.

Preferably, each R ¹Be methyl, and X ^-Be chlorion or methyl esters sulfate radical.Preferably, each R ²Be C independently ₁₆-C ₁₈Alkyl or alkenyl, most preferably, each R ²Be straight chain C independently ₁₈Alkyl or alkenyl.

The especially preferred variant of these softening agents is considered to the monoesters or the diester variations of some quaternary ammonium compounds, and these quaternary ammonium compounds have following formula:

(R ¹) _4-m-N+-[(CH ₂) _n-Y-R ³] _mX ^-

Wherein:

Y is-O-(O) C-or-C (O)-O-or-NH-C (O)-or-C (O)-NH-; M is 1 to 3; N is 0 to 4; Each R ¹Be C independently ₁-C ₆Alkyl, hydroxyalkyl, alkyl or substituted hydrocarbon radical, alkoxyl, benzyl or its mixture; Each R ³Be C independently ₁₃-C ₂₁Alkyl, hydroxyalkyl, alkyl or substituted hydrocarbon radical, alkoxyl, benzyl or its mixture, and X ^-Be the compatible anion of any softening agent.

Preferably, Y be-O-(O) C-or-C (O)-O-; M=2; And n=2.Each R ¹Preferably be C independently ₁-C ₃Alkyl, and methyl is most preferred.Preferably, each R ³Be C independently ₁₃-C ₁₇Alkyl and/or alkenyl, more preferably R ³Be straight chain C independently ₁₅-C ₁₇Alkyl and/or alkenyl, C ₁₅-C ₁₇Alkyl, most preferably each R ³Be straight chain C independently ₁₇Alkyl.

As mentioned above, X ^-Can be the compatible anion of any softening agent, for example, acetate, chlorion, bromide ion, methyl esters sulfate radical, formate, sulfate radical, nitrate radical etc. also can be used for the present invention.Preferably, X ^-Be chlorion or methyl esters sulfate radical.

A kind of especially preferred material is so-called DEEDMAMS (a diethyl ester group methyl esters sulfuric acid Dimethyl Ammonium), and this paper defines further that wherein hydrocarbyl chain is derived from tallow acid, and this acid randomly partially hardened to iodine number is about 10 to about 60.

Ii. Skin moisten distillate medicinal water composition

Suitable chemical softener defined herein can comprise skin moisten distillate medicinal water composition." skin moisten distillate medicinal water composition " used herein be a kind ofly soften, console, soft, cover, the chemical softener of lubricated or wet skin.Emollient typically can be realized some these targets, as consoles, preserves moisture and lubricated skin.

Be used for the mixture that emollient of the present invention can be petroleum base fatty acid ester type, alkyl ethoxylate type or these emollients.Suitable petroleum based emollient comprises that those chain lengths are the hydrocarbon of 16 to 32 carbon atoms or the mixture of hydrocarbon.Petroleum base hydrocarbon with these chain lengths comprises mineral oil (being also referred to as " Albolene ") and vaseline (being also referred to as " ceresine ", " mineral jelly " and " mineral jelly ").Mineral oil is commonly referred to as the lower mixture of viscosity of the hydrocarbon that contains 16 to 20 carbon atoms.Vaseline is commonly referred to as the higher mixture of viscosity of the hydrocarbon that contains 16 to 32 carbon atoms.Vaseline is a kind of especially preferred emollient that is used for incorporation into the fibre structure of sanitary tissue products, and a kind of suitable material is with White Protopet ^IS is available from Witco, Corp., Greenwich, Conn.Mineral oil also is a kind of preferred emollient that is used for incorporation into the fibre structure of tissue product.This type of mineral oil also is commercially available in Witco Corp..

Suitable fatty acid ester type emollient comprises and is derived from C ₁₂-C ₂₈Aliphatic acid, preferred C ₁₆-C ₂₂Saturated fatty acid and short chain (C ₁-C ₈, be preferably C ₁-C ₃) those of monohydric alcohol.The representational embodiment of this class ester comprises methyl hexadecanoate, methyl stearate, isopropyl laurate, isopropyl myristate, isopropyl palmitate, the own ester of palm acid ethyl.Suitable fatty acid ester emollient also can be derived from the fatty alcohol (C than long-chain ₁₂-C ₂₈, be preferably C ₁₂-C ₁₆) and than the aliphatic acid of short chain such as the ester of lactic acid, as Lauryl lactate and lactic acid cetyl.

Suitable alkyl ethoxylate type emollient comprises C ₁₂-C ₁₈Alcohol ethoxylate, the ethylene oxide unit average out to 3 to 30 that it has is preferably about 4 to about 23.The representational embodiment of this class alkyl ethoxylate comprises laureth-3 (the lauryl ethoxylate with average 3 ethylene oxide units); laureth-23 (lauryl ethoxylate) with average 23 ethylene oxide units; ceteth-10 (acetyl group ethoxylate) and stearyl polyoxyethylene ether-10 (stearyl ethoxylate) with average 10 ethylene oxide units with average 10 ethylene oxide units.These alkyl ethoxylate emollients are typically united use with the petroleum based emollient of for example vaseline, and the weight rate of alkyl ethoxylate emollient and petroleum based emollient is about 1: 1 to about 1: 3, preferred about 1: 1.5 to about 1: 2.5.

Skin moisten distillate medicinal water composition can randomly comprise " fixative ", so appellation is because it is believed that the migration that it can be used to prevent emollient, make emollient mainly be retained on the surface of the paper structure of using this emollient, thus the skin that emollient can give softening to greatest extent beneficial effect and can be used for being sent to the user.Be used for suitable stationary agent of the present invention and comprise mulit-hydroxy fatty acid ester, polyhydroxy fatty acid amide and their mixture.If as fixative, the polyhydroxy of ester or acid amides part must have at least two free hydroxyl groups.It is believed that these free hydroxyl groups are those of cellulose fibre co-crosslinking by hydrogen bond and tissue webs (using the distillate medicinal water composition on this paper web), also those of the hydroxyl by hydrogen bond list cross-linked ester or acid amides, thus capture and fix other component in distillate medicinal water matrix.Preferred ester and acid amides will partly have 3 or more free hydroxyl groups at polyhydroxy, and typically be non-ionic in nature.Because the cutaneous sensibility of the paper products of distillate medicinal water composition has been used in those uses, these esters also should be relative gentle and non-stimulated to skin with acid amides.

Can be used for suitable mulit-hydroxy fatty acid ester of the present invention and will have following formula:

Wherein R is C ₅-C ₃₁Alkyl, the C of preferred straight chain ₇-C ₁₉Alkyl or alkenyl, the more preferably C of straight chain ₉-C ₁₇Alkyl or alkenyl, the most preferably C of straight chain ₁₁-C ₁₇Alkyl or alkenyl, or their mixture; Y is the polyhydroxy alkyl part, and it has at least 2 free hydroxyl groups and is directly connected to hydrocarbyl chain on the chain; And n is at least 1.Suitable Y group can be derived from polyalcohol such as glycerine, pentaerythrite; Sugar is as gossypose, maltodextrin, galactolipin, sucrose, glucose, wood sugar, fructose, maltose, lactose, mannose and erythrose; Sugar alcohol such as erythrite, xylitol, maltitol, mannitol and sorbierite; Acid anhydrides such as sorbitan with sugar alcohol.

One class is used for suitable mulit-hydroxy fatty acid ester of the present invention and comprises some sorbitan ester, is preferably C ₁₆-C ₂₂The sorbitan ester of saturated fatty acid.Because that its typical mode of production, these sorbitan esters comprise usually is single-, two-, three-etc. the mixture of ester.The representational embodiment of suitable sorbitan ester comprises that dehydrated sorbitol palmitate (for example, SPAN40), sorbitan monostearate (for example, SPAN 60) and sorbitan docosane acid esters, they comprise one or more lists of these sorbitan esters-, two-and the form of three-ester, for example the anhydro sorbitol list-, two-and three-palmitate, the anhydro sorbitol list-, two-and three-stearate, the anhydro sorbitol list-, two-and the tallow acid sorbitan list of three-docosane acid esters and mixing-, two-and three-ester.Also can use the mixture of different sorbitan esters, for example dehydrated sorbitol palmitate and sorbitan monostearate.Especially preferred sorbitan ester is a sorbitan monostearate, typically be single-, two-and the mixture of three-ester (adding some four esters) SPAN 60 for example, with with trade (brand) name GLYCOMUL-S by Lonza, the sorbitan monostearate that Inc. sells.That though these sorbitan esters typically comprise is single-, two-and the mixture of three-ester (adding some four esters), single-and two-ester be generally topmost composition in these mixtures.

Iii. Polysiloxanes and/or other silicone material

Be applicable to that other suitable chemical softener of the present invention comprises silicone material, for example polysiloxane compound, cationic silicone, season silicone compounds and/or amino silicone.Usually, be used for suitable polysiloxanes material of the present invention and comprise that the monomer siloxane unit is those of following structure:

Wherein, for each independently for the siloxanyl monomers unit, R ¹And R ²Be hydrogen or any alkyl, aryl, alkenyl, alkaryl, aralkyl, cycloalkyl, halogenated hydrocarbons or other group independently of one another.These groups can be that replace or unsubstituted arbitrarily.The R of any specific monomer unit ¹And R ²Group can be different from down-the corresponding functional group of individual continuous monomeric unit.In addition, polysiloxanes can be the structure of straight chain, side chain or ring-type.In addition, radicals R ¹And R ²Can be other siliceous functional group independently in addition, such as but not limited to siloxanes, polysiloxanes, silane and polysilane.Radicals R ¹And R ²Any multiple organo-functional group be can comprise, for example alcohol, carboxylic acid, phenyl and amine functional group comprised.

Exemplary alkyl is methyl, ethyl, propyl group, butyl, amyl group, hexyl, octyl group, decyl, octadecyl etc.Exemplary alkenyl is vinyl, allyl etc.Exemplary aryl is phenyl, diphenyl, naphthyl etc.Exemplary alkaryl is tolyl, xylyl, ethylphenyl etc.Exemplary aralkyl is benzyl, α-phenethyl, β-phenethyl, α-benzene butyl etc.Exemplary cycloalkyl is cyclobutyl, cyclopentyl, cyclohexyl etc.Exemplary halo alkyl is chloromethyl, bromoethyl, tetrafluoro ethyl, fluoro ethyl, trifluoroethyl, fluoroform phenyl, hexafluoro xylyl etc.

Preferred polysiloxanes comprises the organopolysiloxane material of straight chain, and it has following formula:

Wherein, each R ¹-R ⁹Group is any C independently ₁-C ₁₀Not substituted alkyl or aryl and R ¹⁰C for any replacement ₁-C ₁₀Alkyl or aryl.Preferably, each R ¹-R ⁹Group is any C independently ₁-C ₄Substituted alkyl not.Person of skill in the art will appreciate that, for example R ⁹Or R ¹⁰Whether be that substituting group is as broad as long technically.Preferably, b and mol ratio (a+b) are between 0 and about 20%, more preferably between 0 and about 10%, most preferably between about 1% and about 5%.

In an especially preferred embodiment, R ¹-R ⁹Be methyl, and R ¹⁰For replace or unsubstituted alkyl, aryl or alkenyl.This type of material is described to dimethyl silicone polymer usually at this paper, and it has the particular functional group applicable to special circumstances.Exemplary dimethyl silicone polymer comprises for example, having alkyl hydrocarbon R ¹⁰The dimethyl silicone polymer of group and have one or more amino, carboxyl, hydroxyl, ether, polyethers, aldehyde, ketone, acid amides, ester, mercaptan and/or comprise the alkyl of this type of functional group and the dimethyl silicone polymer of other functional group of alkenyl analog.For example, as R ¹⁰The aminofunctional alkyl can be dimethyl silicone polymer aminofunctional or aminoalkyl-functionalization.These dimethyl silicone polymers exemplary listed and therefore do not meaned and get rid of that other does not specifically list.

The viscosity that is used for polysiloxanes of the present invention can vary widely as the common viscosity of polysiloxanes changes, as long as this polysiloxanes can become the form that is administered to this paper thin-paged paper products.This includes, but are not limited to be low to moderate about 2.5E-5m ²/ s (25 centistoke) is to about 20m ²Viscosity or even the higher viscosity of/s (20,000,000 centistoke).

Not bound by theory, it is believed that the beneficial effect effect of sense of touch is relevant with mean molecule quantity, viscosity is also relevant with mean molecule quantity.Therefore, owing to directly measure the molecular weight difficulty, this paper uses the viscosity conduct about giving the apparent operating parameter of tissue paper flexibility.

The document of open polysiloxanes comprises authorized the United States Patent (USP) 2,826,551 of Geen on March 11st, 1958; Authorized the United States Patent (USP) 3,964,500 of Drakoff on June 22nd, 1976; Authorize the United States Patent (USP) 4,364,837 of Pader December 21 nineteen eighty-two; Authorize the United States Patent (USP) 5,059,282 of Ampulski; Authorized the United States Patent (USP) 5,529,665 of Kaun on June 25th, 1996; Authorized people's such as Smithe United States Patent (USP) 5,552,020 on September 3rd, 1996; Be published in the BP 849,433 in September 28 nineteen sixty with name with Wooston.All these patents are incorporated herein by reference.That also be incorporated herein by reference is the Silicone Compounds of PetrachSystems Inc. issue, and the 181st to 217 page, it has comprised the extensive tabulation and the description of polysiloxanes substantially.

In one embodiment, chemical softener can mix with fiber especially staple fibre to form fiber furnish, especially the staple fibre batching.

In another embodiment, chemical softener can be applied to the fibre structure of embryo fiber web and/or aeration-drying.Can chemical softener be applied to the fibre structure of embryo fiber web and/or aeration-drying by the known any appropriate method of those of ordinary skills.The non-limiting example of this class application process comprises chemical softener is sprayed on the fibre structure of embryo fiber web and/or aeration-drying, and/or chemical softener is extruded on the fibre structure of embryo fiber web and/or aeration-drying.Other application process comprises chemical softener is brushed on the fibre structure of embryo fiber web and/or aeration-drying, and/or the fibre structure of embryo fiber web and/or aeration-drying is immersed in the chemical softener.

Optional member:

The fibre structure of aeration-drying of the present invention can comprise optional member, it is selected from temporary wet strength resins, dry strength resin, wetting agent, anti-raising agent, absorption enhancer, fixative, this optional member especially with skin moisten distillate medicinal water composition, comprise that organic acid antivirotic, antiseptic, polyol polyester, anti-migration agent, polyhydroxy plasticizer and their mixture unite use.The examples of such optional composition can add in the fibre structure of fiber furnish, embryo fiber web and/or aeration-drying.

The examples of such optional composition can be present in the fibre structure of aeration-drying with any content based on the dry weight of the fibre structure of aeration-drying.

Based on the fibre structure of doing aeration-drying, the content that optional member can be present in the fibre structure of aeration-drying is about 0.001% to about 50% by weight, and/or about 0.001% to about 20%, and/or about 0.01% to about 5%, and/or about 0.03% to about 3%, and/or about 0.1% to about 1.0%.

I. Temporary wet strength additives

A method that gives fugitive wet strength provides and forms acid catalyzed hemiacetal, and it can be by on the paper fibre or be used for introducing ketone or more particularly introducing aldehyde functional group in the adhesion additive of paper fibre forming.A kind of binder substance of having found especially to can be used for to give the fugitive wet strength of this form is Cytec, the Parez 750 that Stamford, CT provide.

Also can use other additive to increase this wet strength mechanism.The technology that gives fugitive wet strength is well known in the art.Be incorporated herein by reference so that the example technique that gives the of short duration wet strength method of paper web to be shown and comprise following United States Patent (USP) 5,690,790,5,656,746,5,723,022,4,981,557,5,008,344,5,085,736,5,760,212,4,605 ,/02,6,228,126,4,079,043,4,035,229,4,079,044 and 6,127,593.

Though it is an appropriate technology that produces temporary wet strength that hemiacetal forms mechanism, but also has other method, as providing the scraps of paper a kind of binder mechanism, it more works than under the high dilution condition that is experienced in as water closet or sewer subsequently and septic tank system under dry or little wet condition.These methods are primarily aimed at the paper web product, and it will be handled under the situation of high dilution then being sent under humidity or the wetting conditions a little.To be incorporated herein by reference the exemplary architecture that realizes this process with expression below with reference to document, and those skilled in the art will be easy to recognize that they can be applied on the paper web of the present invention, and it usually will be with than providing in these described those lower moisture: United States Patent (USP) 4,537,807,4,419,403,4,309,469 and 4,362,781.

Ii. Dry strength additive

The non-limiting example of dry strength resin comprises polyacrylamide (as the CYPRO 514 that produced by Cytec ofStamford CT and the combination of ACCOSTRENGTH 711); Starch is for example available from being positioned at Bridgewater, the cornstarch of the National Starch and ChemicalCompany of N.J. and/or farina (as REDIBOND 5320 and 2005); Polyvinyl alcohol (as by Air Products Inc of Allentown, the AIRVOL that Pa. produces ^540); Guar gum or locust bean gum; And/or carboxymethyl cellulose (as available from HerculesInc., Wilmington, the CMC of Del.).The amount of the dry strength additive that uses can be more or less with control stretching intensity and velveteen content.

Iii. Wetting agent

The non-limiting example that is applicable to wetting agent of the present invention comprises polyol (as glycerine and polyethylene glycol), non-ionic surface active agent (as the oxirane and the addition compound product of propylene oxide and fatty alcohol, aliphatic acid and fatty amine randomly).

In fact the tabulation of above-mentioned optional member only is intended to for exemplary, and does not mean that and limit the scope of the present invention.

Method of the present invention:

The fibre structure of aeration-drying of the present invention can be by any suitable aeration-drying papermaking process preparation.

The non-limiting example of suitable aeration-drying papermaking process that is used to prepare the fibre structure of aeration-drying of the present invention is described below.

In one embodiment, by staple fibre and water are mixed with the staple fibre batching.One or more supplementary elements such as rerum natura composition and/or optional member can be added in the staple fibre batching.Can make the staple fibre batching enter the head box of paper machine subsequently.The staple fibre batching is deposited on the feed surface to form individual layer embryo fiber web then.Can and/or extrude and/or any other suitable method that those of ordinary skill in the art is known is added rerum natura composition and/or optional member on the embryo fiber web to by spraying.The embryo fiber web can be sent on the aeration-drying band then, thereby can carry out drying to the embryo fiber web by the aeration-drying method.The fibre structure of aeration-drying can be sent on the Yankee drying machine from the aeration-drying band.The fibre structure of aeration-drying can be reeled from the Yankee drying machine and enter the roller.

Also can be with the fibre structure of aeration-drying from the aeration-drying band, or be sent to behind the Yankee drying machine (if using this drying machine) and reel and enter in the roller.When the fibre structure of aeration-drying is half-dried or behind the bone dry, rerum natura composition and/or optional member can be administered on it.The TAD fibre structure is convertible into various paper products, and especially thin page or leaf sanitary tissue products can be form of single sheet and/or multilayer form.

In another embodiment, can be by the fibre structure of staple fibre batching and long fiber batching preparation aeration-drying.Can prepare the long fiber batching by mixing long fiber and water.The long fiber batching can comprise one or more supplementary elements such as rerum natura composition and/or optional member.During these one or more supplementary elements can be present in long and/or staple fibre is prepared burden.Fiber furnish can be placed in the head box of paper machine layering.Fiber furnish can be deposited on subsequently on the feed surface to form the embryo fiber web of multilayer, its medium-length fibre batching is imported into one or more layers, and the staple fibre batching is imported into one or more layers.

For being combined into the structure of two laminates, preferred layered approach comprises two-layer structure, and its middle short fiber batching is administered in the top layer, and promptly this layer will contact with the user of goods.In the case, long fiber batching layer will be drawn towards the inside of two-layer combination.

For being converted into the structure of single layer articles, preferred layered approach comprises three layers structure, and its middle short fiber batching is administered in the top layer of center long fiber layer.

Can and/or extrude and/or any other suitable method that those of ordinary skill in the art is known is added rerum natura composition and/or optional member on the embryo fiber web to by spraying.The embryo fiber web can be sent on the aeration-drying band then, thereby can carry out drying to the embryo fiber web by the aeration-drying method.

Can by spraying and/or extrude and/or any other suitable method that those of ordinary skill in the art is known with the rerum natura composition and/or optional member adds to half-dried or dry fibrous web on.

Also can be with the fibre structure of aeration-drying from the aeration-drying band, or be sent to behind the Yankee drying machine (if using this drying machine) and reel and enter in the roller.When the fibre structure of aeration-drying is half-dried or behind the bone dry, rerum natura composition and/or optional member can be administered on it.The TAD fibre structure is convertible into various paper products, and especially thin page or leaf sanitary tissue products can be form of single sheet and/or multilayer form.The surface that paper products can be designed so that to plan to contact the paper products of application on human skin comprises staple fibre batching and/or staple fibre.

Embodiment 1

It is to exemplify example a kind of method of introducing the preferred embodiment of the invention has been described that present embodiment is made tissue product with the fourdrinier machine of pilot-scale.

Using conventional pulper to make northern softwood kraft (NSK) aqueous slurry of about 3% denseness and pass through manages towards the mother of fourdrinier machine head box.

In order to give the finished product permanent wet strength, prepared 1% dispersion of the Kymene 557LX of Hercules, and added to the female pipe of NSK with the speed that is enough to send 0.7%Kymene 557LX (based on the dry weight of finished product paper).By the online agitator of slurries process that will handle, the absorbability of permanent wet strength resin is strengthened.Then carboxymethyl cellulose (CMC) is added to the female pipe of NSK behind the online agitator.At first CMC is dissolved in the water, and to be diluted to solution strength be 1% by weight.Use Hercules CMC-7MT ^Preparation CMC solution.With the speed of 0.15%CMC (based on the dry weight of finished product paper) by weight the CMC aqueous solution is added in the aqueous slurry of NSK fiber.The centrifugal stock pump that send of aqueous slurry process of NSK fiber is to help the CMC that distributes.Then add chemical softening composition.This chemical softening composition is a ditallow dimethyl methyl esters ammonium sulfate (DTDMAMS).76.7 ℃ of (170) at first pulps in water of the DTDMAMS of preheating, condition is for being preheated to 76.7 ℃ (170 °F).Stir water to help its dispersion during adding DTDMAMS.The concentration of gained DTDMAMS dispersion is 1% by weight, and this dispersion adds in the female pipe of NSK with the speed of 0.2%DTDMAMS (based on the dry weight of finished product paper) by weight.At the fan pump place with plain boiled water with the NSK slurry dilution to about 0.2% denseness.

Use the aqueous slurry of the Acacia fiber (available from PT Tel-Indonesia) of conventional secondary pulper preparation about by weight 3%.The weight averaged fiber length of Acacia batching is 0.66mm, and rugosity is 7.1mg/100m.Acacia slurry stream to the second fan pump is about 0.2% with plain boiled water with slurry dilution to denseness herein.

It is that dispersion layer is until being disposed to mobile fourdrinier wire that the slurries of NSK and Acacia are directed in the multiple-grooved head box that is equipped with the stratiform blade suitably to keep slurry stream.Use three Room head boxs.The Acacia slurries that will comprise 64% finished product paper dry weight cause and lead to outer field chamber, and the NSK slurries that will comprise 36% finished product paper dry weight cause and lead to the floor that contacts with wire and the chamber of central core.NSK and Acacia slurries are combined into the combination slurries in discharging place of head box.

The combination slurries are disposed on the mobile fourdrinier wire, and by deflector and the auxiliary dehydration of vacuum tank.The wetting fiber web of blank is sent to into from fourdrinier wire on the dry fabric of pattern, and fiber consistency is about 17% by weight during transmission.The design dry fabric produces the pattern-densified thin paper, and its discontinuous low-density departs from the zone and is arranged in the regional contiguous network of high density (joint).Dry fabric is to form by impervious resin surface being cast on the fiber web of supporting fabric.The fabric of supporting is 48 * 52 long filament, Double-level Reticulated.The thickness of resins is to support about 12mil on the fabric.Joint area is about 30%, is about 439 every square centimeter (68 per square inch) and open cell remains on frequency.

Further dehydration is finished by the vacuum aided discharge opeing, is about 22% by weight until fibroreticulate fiber consistency.Keeping with when the forming fabric that becomes pattern contact, it is about 58% with predry to fiber consistency by weight that the fiber web of one-tenth pattern passes through the predryer air blast.

Use the spraying creping adhesives that comprises 0.250% polyvinyl alcohol water solution then, half-dried fiber web is adhered to the surface of Yankee drying machine.Crease adhesive to deliver to the Yankee surface based on fiber web dry weight 0.1% adhesive solids rate delivery.

Make fiber web before dry creped on the Yankee with doctor blade, fiber consistency increases to about 98%.

The oblique angle of doctor blade is for about 20 degree and be placed to the angle of attack that about 76 degree can be provided for the Yankee drying machine.The temperature that operates at of Yankee drying machine is that about 350 (177 ℃) and speed are to carry out under about 800fpm (foot per minute) (about 244 meters per minutes) condition.Utilize superficial velocity for the surface drive reel drum of about 680fpm (about 207 meters per minutes) with rolling of paper to roller, thereby cause about 15% crease.

Behind doctor blade, with one 28,122.8g/cm ²The steel that turns round under the load (400psi) to the felt wrapped roll of rubber along whole fibroreticulate width with the fiber web press polish.Quantitative about 20g/m2 of gained thin paper; 1 layer of total dry tensile strength between 533 and 610g/cm (210 and 240g/in) between, 1 layer of wet burst strength between 89 and 165g/cm (35 and 65g/in) between, 2 layer thicknesses are about 0.051cm (0.020 inch).With a similar thin plate gained thin paper folding is formed two-layer, that crease, pattern-densified thin paper together then, thereby the Acacia fibrous face is to the outside.The two-layer thin paper of gained has: a) total quantitatively is about 39g/m ²B) 2 layers of total dry tensile strength 889 and 1067g/cm (350 and 420g/in) between; C) 2 layers of wet burst strength 229 and 330g/cm (90 and 130g/in) between; And d) the about 0.071cm of 4 layer thicknesses (0.028 inch).

Embodiment 2

Identical 2 layers, crease, pattern-densified thin paper (the Acacia fibrous face is to the outside) is present among the embodiment #1, the dimethyl polysiloxane that adds a power CM849-aminofunctional is (by General Electric Silicones of Waterford, N.Y. sell)-being extruded into the both sides of contact application on human skin by slit, every layer of addition is about siloxanes of 0.3% to 0.5% based on the gross weight of fiber.Except eucalyptus BK bleached kraft fibre pulp had replaced Acacia BK bleached kraft fibre pulp, contrast product can use the mode identical with present embodiment to prepare.The fibre length of eucalyptus pulps batching is 0.73mm, and rugosity is 8.0mg/100m.Through the evaluation of expert appraisal group, use the tissue paper of contrast batching gained not too soft.

Embodiment 3

It is to exemplify example the another kind of method of introducing the preferred embodiment of the invention has been described that present embodiment is made tissue product with the fourdrinier machine of pilot-scale.Using conventional pulper to make northern softwood kraft (NSK) aqueous slurry of about 3% denseness and pass through manages towards the mother of fourdrinier machine head box.

In order to give the finished product permanent wet strength, prepared 1% dispersion of the Kymene 557LX of Hercules, and added to the female pipe of NSK with the speed that is enough to send 0.9%Kymene 557LX (based on the dry weight of finished product paper).By the online agitator of slurries process that will handle, the absorbability of permanent wet strength resin is strengthened.Then carboxymethyl cellulose (CMC) is added to the female pipe of NSK behind the online agitator.At first CMC is dissolved in the water, and to be diluted to solution strength be 1% by weight.Use Hercules CMC-7MT ^Preparation CMC solution.With the speed of 0.15%CMC (based on the dry weight of finished product paper) by weight the CMC aqueous solution is added in the aqueous slurry of NSK fiber.The centrifugal stock pump that send of aqueous slurry process of NSK fiber is to help the CMC that distributes.Then add the adherence inhibitor composition.This adherence inhibitor composition is a ditallow dimethyl methyl esters ammonium sulfate (DTDMAMS).76.7 ℃ of (170) at first pulps in water of the DTDMAMS of preheating, condition is for being preheated to 76.7 ℃ (170 °F).Stir water to help its dispersion during adding DTDMAMS.The concentration of gained DTDMAMS dispersion is 1% by weight, and this dispersion adds in the female pipe of NSK with the speed of 0.125%DTDMAMS (based on the dry weight of finished product paper) by weight.

Use the aqueous slurry of the Acacia fiber (available from PTTel-Indonesia) of conventional secondary pulper preparation about by weight 1.5% also to manage by mother towards the fourdrinier machine head box.The weight averaged fiber length of Acacia batching is 0.66mm, and rugosity is 7.1mg/100m.The Acacia batching joins the NSK slurries at the fan pump place, and with plain boiled water both being diluted to denseness herein is about 0.2%.

Use the aqueous slurry of the Acacia fiber (available from PT Tel-Indonesia) of conventional secondary pulper preparation about by weight 3%.Acacia slurry stream to the second fan pump is about 0.2% with plain boiled water with slurry dilution to denseness herein.

It is that dispersion layer is until being disposed on the mobile fourdrinier wire that the slurries of NSK/ Acacia and Acacia are directed in the multiple-grooved head box that is equipped with the stratiform blade suitably to keep slurry stream.Use three Room head boxs.The Acacia slurries that will comprise 53% finished product paper dry weight cause and lead to outer field chamber, and the NSK/ Acacia slurries that will comprise 47% (30%NSK and 17% Acacia) finished product paper dry weight cause the chamber of leading to the floor that contacts with wire and lead to skin and with floor that wire contacts between the chamber of floor.NSK/ Acacia and Acacia slurries are combined into the combination slurries in discharging place of head box.

The combination slurries are disposed on the mobile fourdrinier wire, and by deflector and the auxiliary dehydration of vacuum tank.The wetting fiber web of blank is sent to into from fourdrinier wire on the dry fabric of pattern, and fiber consistency is about 18% by weight during transmission.The design dry fabric produces the pattern-densified thin paper, and its discontinuous low-density departs from the zone and is arranged in the regional contiguous network of high density (joint).Dry fabric is to form by impervious resin surface being cast on the fiber web of supporting fabric.The fabric of supporting is 48 * 52 long filament, Double-level Reticulated.The thickness of resins is to support about 9mil on the fabric.Joint area is about 40%, is about 439 every square centimeter (68 per square inch) and open cell remains on frequency.

Further dehydration is finished by the vacuum aided discharge opeing, is about 26% until fibroreticulate fiber consistency.Keeping with when the forming fabric that becomes pattern contacts, the fiber web of one-tenth pattern is predrying by air blast to be about 59% up to fiber consistency by weight.

Use the spraying creping adhesives that comprises 0.250% polyvinyl alcohol water solution then, half-dried fiber web is adhered to the surface of Yankee drying machine.Crease adhesive to deliver to the Yankee surface based on described fiber web dry weight 0.1% adhesive solids rate delivery.

Make fiber web before dry creped on the Yankee with doctor blade, fiber consistency increases to about 98%.The oblique angle of doctor blade is for about 20 degree and be placed to the angle of attack that about 76 degree can be provided for the Yankee drying machine.The Yankee drying machine turns round under the speed of the temperature of about 149 ℃ (300) and about 800fpm (foot per minute) (about 244 meters per minutes).Utilize superficial velocity for the surface drive reel drum of about 680fpm (about 207 meters per minutes) with rolling of paper to roller, thereby cause about 15% crease.

Behind doctor blade, with one 31,638g/cm ²The steel that turns round under the load (450psi) to the felt wrapped roll of rubber along whole fibroreticulate width with the fiber web press polish.

Quantitative about 22g/m2 of gained thin paper; 1 layer of total dry tensile strength 711 and 813g/cm (280 and 320g/in) between, 1 layer of wet burst strength between 114 and 165g/cm (45 and 65g/in) between, 2 layer thicknesses are about 0.051cm (0.020 inch).

With a similar thin plate gained thin paper folding is formed two-layer, that crease, pattern-densified thin paper together then, thereby the Acacia fibrous face is to the outside.The two-layer thin paper of gained has: a) total quantitatively for about 42 to 45g/m2; B) 2 layers of total dry tensile strength are between 1397g/cm and 1524g/cm (550g/in and 600g/in); C) 2 layers of wet burst strength are between 229g/cm and 305g/cm (90g/in and 120g/in); And d) 4 layer thicknesses are about 0.071cm (0.028 inch).

Embodiment 4

It is to exemplify example a kind of method of introducing the preferred embodiment of the invention has been described that present embodiment is made sanitary tissue products with the fourdrinier machine of pilot-scale.Northern softwood kraft (NSK) aqueous slurry and this batching of using conventional pulper to make about 3% denseness are managed by the mother towards the fourdrinier machine head box.

In order to help to give the finished product temporary wet strength, prepared 1% dispersion of the Parez 750C of Cytec, and added to the female pipe of NSK with the speed that is enough to send 0.2% this resin (based on the dry weight of finished product paper).By the online agitator of slurries process that will handle, the absorbability of temporary wet strength resin is strengthened.

With plain boiled water the NSK slurry ingredients is diluted to about 0.2% denseness at the fan pump place.

Use aqueous slurry and this batching of the Acacia BK bleached kraft fibre pulp (available from PT Tel-Indonesia) of conventional secondary pulper preparation about by weight 3% to manage by mother towards the fourdrinier machine head box.The weight averaged fiber length of Acacia batching is 0.66mm, and rugosity is 7.1mg/100m.In order to help to give the finished product temporary wet strength, 1% dispersion of the Parez 750C of Cytec also adds to the female pipe of Acacia with the speed that is enough to send 0.05% this resin (based on the dry weight of finished product paper).By the online agitator of slurries process that will handle, the absorbability of temporary wet strength resin is strengthened.The Acacia slurry ingredients flow to second fan pump, is about 0.2% with plain boiled water with slurry dilution to denseness herein.

It is that dispersion layer is until being disposed on the mobile fourdrinier wire that the slurries of NSK and Acacia are directed in the multiple-grooved head box that is equipped with the stratiform blade suitably to keep slurry stream.Use three Room head boxs.The Acacia slurries that will comprise 70% finished product paper dry weight cause and lead to outer field chamber, and will comprise that the NSK slurries of 30% finished product paper dry weight cause the chamber of leading to central core.

NSK and Acacia slurries are combined into the combination slurries in discharging place of head box, and the combination slurries are disposed on the mobile fourdrinier wire, and by deflector and the auxiliary dehydration of vacuum tank.

The wetting fiber web of blank is sent on the pattern dry fabric from fourdrinier wire, and fiber consistency is about 15% during transmission.The design dry fabric produces the pattern-densified thin paper, and its discontinuous low-density departs from the zone and is arranged in the regional contiguous network of high density (joint).Dry fabric is to form by impervious resin surface being cast on the fiber web of supporting fabric.The fabric of supporting is 45 * 52 long filament, Double-level Reticulated.The thickness of resins is to support about 10mil on the fabric.Joint area is about 40%, is about 503 every square centimeter (78 per square inch) and open cell remains on frequency.

Further dehydration is finished by the vacuum aided discharge opeing, is about 30% until fibroreticulate fiber consistency.Keeping with when the forming fabric that becomes pattern contact, it is about 65% with predry to fiber consistency by weight that the fiber web of one-tenth pattern passes through the predryer air blast.Then half-dried fiber web is sent to the Yankee drying machine and it is sticked to the surface of Yankee drying machine with the spraying that the includes 0.125% polyvinyl alcohol water solution adhesive that creases.Crease adhesive to deliver to the Yankee surface based on described fiber web dry weight 0.1% adhesive solids rate delivery.Make fiber web before dry creped on the Yankee with doctor blade, fiber consistency increases to about 98%.

The oblique angle of doctor blade is for about 25 degree and be placed to the angle of attack that about 81 degree can be provided for the Yankee drying machine.The temperature that operates at of Yankee drying machine is that about 350 (177 ℃) and speed are to carry out under about 800fpm (foot per minute) (about 244 meters per minutes) condition.Utilize superficial velocity for the surface drive reel drum of about 200 meters per minutes (656 feet per minutes) with rolling of paper to roller.In the free-span distance of doctor blade and reel machine (its position makes the fiber web basic horizontal), comprise that the top side that DEEDMAMS aqueous dispersion that the application device of extruding slit will have 44% cationic active material is applied to tissue webs makes active material be evenly distributed on the tissue web surface.Thereby keep fully flowing of DEEDMAMS slurries that 1% DEEDMAMS is applied on the tissue web surface.

Use conventional tissue rolling frame to convert the gained tissue webs to individual layer toilet paper paper products.That finished product has quantitatively is about 0.00342g/cm ²(211b/3000ft ²); Total dry tensile strength is that 1143g/cm (450g/in) and density are 0.065g/cm ³Except eucalyptus BK bleached kraft fibre pulp had replaced Acacia BK bleached kraft fibre pulp, contrast product can use the mode identical with present embodiment to prepare.The fibre length of eucalyptus pulps batching is 0.73mm, and rugosity is 8.0mg/100m.Through the evaluation of expert appraisal group, use the tissue paper of contrast batching gained not too soft.

Embodiment 5

Except for reducing fiber web quantitatively (purpose is to make two layers of thin page or leaf web products) being adjusted the batching flow velocity, repeat embodiment 4.By while unwinding two roller fiber webs, they are combined into two-layer groove prepare two laminates with contact adhesive (it makes synusia keep the ability of sliding relative to each other) band narrow, approximately 1.27cm ( ").Be in contact with one another thereby finish in conjunction with every layer of Yankee side surface separately.That finished product has quantitatively is about 0.004564g/cm ²(281b/3000ft ²); Total dry tensile strength is that 1270g/cm (500g/in) and density are 0.055g/cm ³Once more, except eucalyptus BK bleached kraft fibre pulp had replaced Acacia BK bleached kraft fibre pulp, contrast product can use the mode identical with present embodiment to prepare.Once more, through the evaluation of expert appraisal group, use the tissue paper of contrast batching gained not too soft.

Though, it will be apparent to those skilled in the art that many other variations and modifications may be made with the explanation of specific embodiments and/or individual characteristics with described the present invention.In addition, all combinations of embodiment and feature all are possible, and can obtain preferred enforcement of the present invention.Therefore, Fu Jia claim is intended to comprise all such changes and modifications in the scope of the invention.

Claims

1. the fibre structure of an aeration-drying is characterized in that comprising:

A. comprise the staple fibre batching of staple fibre, the length of described staple fibre is 0.4mm to 1.2mm, rugosity be 3.0mg/100m to 7.5mg/100m and

B. rerum natura composition, described rerum natura composition is selected from permanent wet strength resin, chemical softener and their mixture.

2. the fibre structure of aeration-drying as claimed in claim 1, wherein said staple fibre is characterised in that and comprises cellulose.

3. the fibre structure of aeration-drying as claimed in claim 2, wherein said staple fibre is derived from fiber source, and described fiber source is selected from: Acacia, eucalyptus, maple, Oak Tree, white poplar, birch, cottonwood, alder, Ash tree, cherry tree, elm, Chinese walnut, willow, rubber tree, walnut, locust tree, outstanding tinkling of pieces of jade wood, beech tree, Chinese catalpa, yellow camphor tree, gumhar wood, silk tree, anthocephalus chinensis, lily magnolia, bagasse, flax, hemp, mestha and their mixture.

4. the fibre structure of the described aeration-drying of each claim as described above, wherein said fibre structure comprise also and comprise long stapled long fiber batching that the length that described long fiber has is greater than 1.2mm.

5. the fibre structure of the described aeration-drying of each claim as described above, described fibre structure is characterised in that the weight by described total fiber composition, described fibre structure comprises at least 10% described staple fibre batching.

6. the fibre structure of the described aeration-drying of each claim as described above, described fibre structure be characterised in that described fibre structure has quantitatively greater than 12g/m2 to 120g/m2.

7. the fibre structure of the described aeration-drying of each claim as described above, described fibre structure are characterised in that wet burst strength that described fibre structure has is greater than 25g/in.

8. the fibre structure of the described aeration-drying of each claim as described above, described fibre structure is characterised in that described fibre structure comprises two or more fiber furnish layers.

9. the fibre structure of the described aeration-drying of each claim as described above, wherein said rerum natura composition comprises permanent wet strength resin and/or chemical softener, described permanent wet strength resin comprises polyamide-epichlorohydrin resins, and described chemical softener is selected from quaternary ammonium compound, siloxanes, skin cream immunomodulator compounds and their mixture.

10. one or more layers approaches page or leaf sanitary tissue products, and described thin page or leaf sanitary tissue products comprises the described fibre structure of each claim as described above.

11. a method for preparing as the fibre structure of each described aeration-drying in the claim 1 to 9, described method is characterised in that and may further comprise the steps:

A. preparation comprises the fiber furnish of staple fibre batching, and the length of the staple fibre that described staple fibre batching comprises is 0.4mm to 1.2mm, and rugosity is 3.0mg/100m to 7.5mg/100m, forms described staple fibre batching by described staple fibre is mixed with water;

B. described fiber furnish is deposited on porous and forms the surface upward to form the embryo fiber web; Preferably wherein said embryo fiber web is formed by two or more batching layers;

C. thereby the described embryo fiber web of aeration-drying forms the fibre structure of described aeration-drying;

Be characterised in that the fibre structure to described fiber furnish and/or described embryo fiber web and/or described aeration-drying adds permanent wet strength resin and/or chemical softener.