CN1224476A - Process for creping tissue paper - Google Patents

Abstract

An adhesive for applying to a creping surface in the process for dry creping tissue paper is disclosed. The adhesive comprises cationic starch and optionally a polyvinyl alcohol and a water-soluble, thermosetting, cationic polyamide-epihalohydrin resin. The adhesive provides high adhesion and doctorability for dry creping.

Description

The creping of thin paper

This invention relates generally to a kind of wrinkling tissue web product and manufacturing technique thereof.More particularly, the wrinkling thin paper that relates to a kind of drying, its initial paper web forms on a kind of fourdrinier machine or similar paper making equipment, when half-dried, be bonded and fixed on the drying of a column type, basically finish drying at drying, make it wrinkling on drying by a kind of flexible creping blade then paper web.

Hygiene paper product is widely used.This is its a kind of commercial the abbreviation, and it can be used for various occasions, for example face tissue, toilet tissue and hygroscopicity paper handkerchief.The specification of these products, i.e. basic weight (basicweight), thickness, intensity, antiquarian, decentralized media etc. all are very different, but they all adopt identical explained hereafter, and their manufacturing technique is called as wrinkling paper technology.

Wrinkling is a kind of mode of paper web being carried out mechanical compression along machine direction.Its result can improve the basic weight (quality of unit are) of paper, and can make its multiple physical property that great variation takes place, especially when machine direction is measured.Wrinklingly finished by an elastic blade usually, be known as scraper, in paper-making process, it is resisted against on the Yankee dryer.This blade also is known as creping doctor sometimes or abbreviates creping blade as.

The diameter of Yankee dryer is very big, and normally the cylinder of 8-20 foot is connected with steam under pressure in it, and its surface is awfully hot, so that finish the drying to formed paper web when paper technology finishes.Paper web at first is formed on a kind of shaping carrier with holes, papermaking fourdrinier wire for example, and it has deviate from a large amount of moisture at this, and this moisture is that the loosen collagen fibre slurry is necessary.They are transferred on a woollen blanket or a kind of fabric at press section, pass through herein to the mechanical expression of paper web or by means of some other dewatering type, the method that penetrates with hot-air for example, make it continue dehydration, drying is finished on the last surface that is sent to the Yankee dryer under a kind of partial desiccation state.

With scraper bonding paper web is exerted pressure and to give paper web some necessary character.The particularly important is flexibility, intensity and bulkiness.

When flexibility is the hand-held product friction of consumer skin or the sense of touch when the palm of the hand wrinkles.This feels comprehensively to be caused by several physical propertys.Usually, present technique field those of ordinary skill thinks wherein with the maximally related physical property of flexibility it is the rigidity of used paper web when manufacturing a product.Rigidity directly depends on the intensity of paper web usually again.

Intensity is a kind of performance of product and the paper web that forms it, and it can keep product physical integrity and tear resistance in use, resistance to rupture and anti-comminuted.

Bulkiness described herein is opposite with the density of tissue web.It is another important truly feels performance of tissue web.The raising of bulkiness can be given its absorbefacient sensation as cloth usually.The bulkiness part of tissue web is given by wrinkling.

The paper web of manufacturing and the adhesive property between the dryer also are very important for the control in the stroke space of paper web between creping blade and take up roll.So-called take up roll is the formed winding up roller of paper web.If the caking property deficiency of paper web will cause the control level of page to descend, be difficult to form a kind of uniform paper bowl.Paper web between creping blade and winding up roller is loose, will cause fold, folding line or make the page edge of winding up roller paper produce ripple.The bad winding up roller of moulding not only influences the reliability of papermaking operation, and influences the production operation of thin paper and paper handkerchief in its subsequent process, and in these operations, paper bowl is converted to thin paper and tissue products.

The paper web of manufacturing and the bonding degree between the dryer also are very important for the drying of paper web.The bonding degree is higher, can reduce the opposing that heat is transmitted, and makes the paper web rapid-curing cutback of determining dry thus, improves the service efficiency and the operating speed of energy.

But the bonding degree is not to determine product quality and unique factor of making stability.For example, have found that some adhesive can form a kind of bonding in the wrinkling some place between paper web and scraper, make paper web can not produce suitable displacement, cause the part paper web still to be bonded in the edge that also passes through scraper on the dryer.This will cause occurring in the paper web fracture that defective also often causes paper web.

In addition, be necessary although on dryer, produce the gathering of a basic weight adhesive, for the adhesive of some type, excessive gathering can occur or form striped.Striped can cause the skewness of adhesive on the whole width of dryer.Thereby cause and occur projection or wrinkle in the finished product paper bowl.Common second scraper is positioned at after the creping blade, so that remove excessive creping adhesives and other remnants.This blade is called cleaning blade.Cleaning blade and creping blade must often be changed, in case form the striated cover layer, make page out of control.

At this, so-called " scraping property (doctorability) " is meant that the paper web ratio is easier to shift out from dryer, and can not produce defective or not need often to change scraper, with the excessive gathering of anti-adhesive agent.

A critical nature of creping adhesives is the moist again of it." moist again " described herein is meant that the adhesive films that is retained on the hot desiccated surface is included in the ability that moisture activates in the partial desiccation tissue web when paper web contacts with the desiccated surface of heat.Adhesive significantly increases and shows its rewetting raising.Rewetting is very important, because in the given rotation of Yankee dryer, mostly just some desiccated surface is covered by adhesive.Main stick portion between page and the dryer is to be caused by the creping adhesives that retains in the process formerly.

Because the gathering of water soluble ingredient in the paper web, paper web trends towards sticking on the drying.These water soluble ingredients will form a kind of adhesive films, and at the branchpoint place of paper web to cylinder, this film will become wet again.Yet,, impelled the researcher in this field to do a large amount of work to the demand of the adhesive of specific class and type.Various types of crepe rubbers are known in the prior art.For example, the use of animal glue has had very long history.

In addition, the United States Patent (USP) of Bates 3,926,716 is used as reference at this, this patent disclosure a kind of bonding method of paper web of improving, comprising the technology that applies a kind of moisture polyvinyl alcohol.

Bates points out, when paper technology belongs to the classification that has closely knit colored type, needs to select a kind of adhesive of using between paper web and the dryer of being adapted at especially.Characteristics with closely knit colored type paper web are: the higher zone of the density that distributing in the fluffy district of height, its latest developments are that the higher zone of density is that continuous and high fluffy district then disperses.Preparation is called the ventilation seasoning with a kind of method of closely knit colored type paper web.Paper web with closely knit colored type has proposed special requirement to the adhesive between paper web and the rotary furnace drying machine.This is because paper web only bonds at high-density region and dryer.The challenge that adhesive faced is not only owing to less with the contacted surface area of dryer, but also because paper web must shift to transfer roller with higher fibre density, this is the lower cause of efficient because of the less cylinder dryer of contact area.The bonding that is dried to the paper web of higher fiber density and dryer is more difficult, because at the branchpoint place of paper web to dryer, have only a spot of moisture can make adhesive films rewetting.

The United States Patent (USP) 4,501,640 that another embodiment that is used as reference is Soerens, it discloses a kind of adhesive, and this adhesive comprises the mixture of the cationic polyamide resins of a kind of moisture polyvinyl alcohol and water-soluble, HEAT SETTING.

Though many adhesives that include these embodiment are disclosed and are used, do not have the mixture of a kind of adhesive or adhesive can provide gratifying scraping property, can be moist again and resultant effect that cohesiveness combines.

Therefore, the object of the present invention is to provide the method that makes tissue web wrinkling, it can improve the cohesiveness of adhesive, keeps its scraping property again simultaneously, thereby has overcome above-mentioned limitation.

By the following description, will be understood that above-mentioned purpose of the present invention and other purposes.

The present invention relates to a kind of the heating desiccated surface on a kind of tissue web is carried out wrinkling method, it may further comprise the steps:

A., a kind of semiarid initial paper web is provided;

B. a kind of first creping adhesives is applied to heat desiccated surface on or on the described partial desiccation paper web, described first adhesive comprises polyvinyl alcohol;

C. a kind of second creping adhesives is applied to heat desiccated surface on or on the described partial desiccation paper web, described second adhesive comprises cationic polyamide resins water-soluble, HEAT SETTING;

D. by means of described first creping adhesives and second creping adhesives initial paper web of described partial desiccation is fixed on the described heated drying surface, finishes drying described initial paper web at this;

E. by a kind of flexible creping blade, make dry paper web wrinkling on described desiccated surface.

Polyvinyl alcohol accounts for about the 30-95% of the whole creping adhesives net weight that applied, and is preferably about 75-85%.

This polyvinyl alcohol is the polyvinyl acetate of partial hydrolysis preferably, and its degree of hydrolysis should be preferably 80-95% greater than 80%.

The molecular weight ranges that is suitable for the polyvinyl alcohol of the present invention's use is about 90,000-140,000.At this, what show molecular weight indirectly is the viscosity of 4% polyvinyl alcohol aqueous dispersions when 20 spend.Polyvinyl alcohol used in the present invention, its viscosity are approximately greater than 20 centipoises (cP), more preferably greater than 35 centipoises.

The content of the cationic polyamide resins of water-soluble, HEAT SETTING of the present invention is about the 5-50% of the whole creping adhesives net weight that applied, and is preferably 15-25%.

This polyamide product preferably comprises a kind of epihalohydrins and the product that contains the polyamide of secondary amine.This epihalohydrins is chloropropylene oxide preferably, and the secondary amine of polyamide is preferably derived out by polyalkylene polyamide and saturated aliphatic dicarboxylic acid.Its dicarboxylic acids preferably contains 3-10 carbon atom.

In polyamide, the ratio of epihalohydrins and secondary amine is preferably 0.5: 1-1.8: about 1.

Polyvinyl alcohol and polyamide are deposited in the water carrier respectively.At the place, application point, the solid concentration of polyvinyl alcohol is about about 0.05-2%, and the solid concentration of polyamide is about about 0.025-1%.

The application point of polyvinyl alcohol and polyamide is preferably on the surface of dryer, is positioned at the place ahead of paper web sticking point; But any one application point also can be on the paper surface that is positioned at paper web and dryer bonding point the place ahead in above-mentioned two kinds of components.

The interpolation order of polyvinyl alcohol and polyamide can change, but preferably adds polyvinyl alcohol earlier, and polyamide is added in the back.So just, can form a kind of stacked coating earlier, its direct and polyamide-based thin layer contacts.

Based on the net weight of creping adhesives and the net weight of paper web, the total amount of the creping adhesives that is applied is preferably 0.1lb/ton to 10lb/ton.At this, the lb/ton of unit is meant with the pound to be the ratio of the measured creping adhesives net weight of the unit paper web net weight measured with being unit with the ton.

This tissue web can comprise various natural fabric, and the wood pulp of chemistry and mechanical type is wherein arranged.In a preferred embodiment, it includes hardwood and cork paper fibre, and wherein, at least 50% paper fibre is a hardwood, at least 10% be cork.This tissue web also comprises the filler of some particles.

In a preferred embodiment, this method is used for preparing basic weight and is about 10-50g/m ²Thin paper, be preferably 10-300g/m ²Thin paper.Its density is about 0.03-0.6g/cm ³, be preferably 0.05-0.2g/cm ³

Except as otherwise noted, at this employed percentage, ratio and ratio are weight ratio.

Accompanying drawing 1 is to the schematically illustrating of a kind of papermaking process that contains the preferred embodiment of the present invention, comprising the wrinkling new method of thin paper.

More than background of the present invention is described, now the present invention and appended example are elaborated.The following description is intended to help people to understand the present invention, and also unrestricted the present invention, claims define the present invention, and it specifically indicates and knows and defines essentiality content of the present invention.

At this, " comprising ", a speech meant various components, and composition or step can combine and be used for implementing the present invention.Therefore, " comprise " speech comprised narrower " basically by ... form " speech and " by ... form " implication of a speech.

At this, " water miscible " speech means that in the time of 25 degrees centigrade, soluble weight is at least those materials of 3% in water.

At this, " tissue web, paper web, the thin width of cloth, page and paper product " means the thin papery open width material of being made by certain technology, and this technology comprises: form moisture paper making raw material; This raw material is deposited on a kind of surface of porous, for example on fourdrinier wire; Method by gravity or vacuum draw then by pressure or not by pressure, and is removed moisture by the mode of evaporation from raw material; Comprise also that wherein last thin web materials with the partial desiccation state adheres to the step on the Yankee dryer, in this step, moisture removal is arrived the state of substantially dry by evaporation, by a kind of flexible scraper paper web is removed from the Yankee dryer then, again the paper web that forms is wound up on the spool.

In the art, " many laminations tissue web; many laminations paper web; many laminations approach the width of cloth; many laminations page and many laminations paper product " can exchange, and they refer to the paper web made by the moisture paper making raw material of two laminations or many laminations, they preferably are made of dissimilar fibers, and these fibers generally are to be used for making the long cork fibrous of tissue web and relatively shorter hardwood fiber.Preferably various rare fiber pulp are assigned to respectively on the hole surface of one or more endless belts, form many laminated construction thus.If originally each lamination is to form on independent surface with holes, then in the process that forms many laminations tissue web, these laminations are combined according to this.

At this, " single thin layer paper web product " means that this product only comprises a lamination creped tissue, and this lamination can be a kind of uniform material basically, also can be a kind of tissue web of many laminations." multi-layer thin paper web product " then comprises the wrinkling thin paper that a lamination is above.The character of all laminations in many laminations tissue paper product can be roughly uniform, and they also can be many laminations tissue webs.

The present invention relates to a kind of tissue web that makes and produce the method for wrinkle on the oven dry surface of heating, it may further comprise the steps:

A., a kind of semiarid initial tissue web is provided;

B. a kind of first creping adhesives is applied on the desiccated surface of heat, on the perhaps described partial desiccation paper web, described first adhesive comprises a kind of polyvinyl alcohol;

C. a kind of second creping adhesives is applied on the desiccated surface of heat, on the perhaps described partial desiccation paper web, described second adhesive comprises a kind of cationic polyamide resins of water miscible, HEAT SETTING;

D. when the drying of described initial paper web is finished, described half-dried initial paper web is fixed on the desiccated surface of described heat, finishes the drying of initial paper web on this surface by first and second creping adhesives;

E. by means of a flexible creping blade, on the desiccated surface of described heat, make dry paper web wrinkling.

The component of the moisture paper making raw material of a kind of semiarid initial paper web is provided

Can expect that various types of wood pulps can constitute paper fibre used in the present invention, yet, some other cellulose fibre slurry, cotton linter for example, bagasse, artificial silk etc. also can use, and can not be left out.At this, available wood pulp comprises chemical pulp, and sulphite and sulfate (being also referred to as brown paper sometimes) paper pulp for example also has mechanical pulp, ground wood pulp for example, hot machine wood pulp (TMP) and chemistry-Re machine wood pulp (CTMP).The paper pulp that comes from fallen leaves class and conifer trees also can use.

Bardwood pulp, softwood pulp and both compositions can be as the paper fibres of thin paper of the present invention.Described " bardwood pulp " is meant the fibre pulp of the wood materials that comes from fallen leaves trees (angiosperm), and described " softwood pulp " is meant the fibre pulp of the wood materials that comes from conifer trees (gymnosperm).Hardwood, especially eucalyptus kraft pulp are particularly suitable for being used for making tissue web of the present invention with the mixture of northern softwood class kraft pulp (NSK).Another preferred embodiment of the present invention comprises the tissue web of lamination, and wherein, the most handy eucalyptus bardwood pulp makes its skin, makes its internal layer with northern softwood class kraft pulp.Come from the fiber that reclaims paper and also can be used for the present invention, they can contain a kind of or whole in the mentioned kind fiber.

In moisture paper making raw material, can also comprise granular filler, comprising clay, calcium carbonate, titanium dioxide, talcum, alumina silicate, calcium silicates, three diaspores, active carbon, pearl starch, calcium sulfate, glass microsphere, diatomite and their mixture.

Other materials, for example following cited material all can add in the moisture paper making raw material or in the initial paper web, so that give product other character, perhaps improves its paper technology, as long as they do not influence or offset advantage of the present invention.

Sometimes, in order to improve its retention and paper web intensity, can be with a kind of component, the especially cationic starch of starch as moisture paper making raw material.(Bridgewater, NewJersey) starch of the trade mark of Sheng Chaning RediBOND by name is particularly suitable for above-mentioned purpose by National Starch and Chemical Corp.

Usually, a kind of positive charge bias voltage material is joined in the paper technology, so that in paper technology, control the zeta electromotive force of moisture paper making raw material.A kind of suitable material is Cypro 514, and it is Cytec, Inc.ofStamford, the product of CT.

Usually, also add retention agents.In order to strengthen the retention of fine particle, prevent from multivalent ion to be joined in the moisture paper making raw material in its circulation that is suspended in paper machine all the time.For example, adding alum has been that people know already.Recently, have the polymer that many electric charges discharge the position along main chain and also effectively be used for this purpose.Anion and cationic flocculant are all within the scope of the present invention involved.By Hercules, the trade mark that Inc.of Wilmington, Delaware produce by name RETEN235's and by Cytec, Inc.of Stamford, the flocculant of the trade mark that CT produces Accurac 171 by name is some examples of Flokal B.By Hercules, the trade mark that Inc.of Wilmington, Delaware produce by name RETEN's 157 and by Cytec, Inc.of Stamford, the flocculant of the trade mark that CT produces Accurac 91 by name is some examples of the cationic flocculant that is fit to.

In order to improve moulding, draining, intensity and retention performance can be used the molecule that surface area is big, negative electrical charge is strong, and this is known for those skilled in the art person.For example, can authorize the United States Patent (USP) 5,221,435 of Smith referring on June 22nd, 1993, this patent is used as reference at this.The common raw material that is used for this purpose is a silica gel, perhaps bentonite.The combination of these materials also within the scope of the invention.

Grade for the paper of no permanent wet strength has realized advantage of the present invention the most particularly.Wet-strength resins, especially polyamide-chloropropylene oxide class even it is joined in the moisture paper making raw material, also can provide wrinkling control to a certain degree usually, about this point, will be described in more detail in other parts of specification.Yet, these advantages also are accompanied by the existence of permanent wet strength in the product simultaneously, this character is normally provided by polyamide-chloropropylene oxide at the wet end of paper technology, and it is not effectively for promoting wrinkling, can directly use polymer to realize this effect in creping.

Wrinkling paper product should have very little intensity when wet, because they need be entered sewerage by the lavatory, this just needs provisional wet-strength resins.The wet strength that wet-strength resins provided is characterized in when water exists, and its part or all intrinsic effectiveness will be lost.

The words of provisional wet strength if desired, adhesive can be chosen from the material of being made up of dialdehyde starch or other resins with acetaldehyde function, for example the trade mark of being produced by National Starch and Chemical Corp is called the product of Co-Bond 1000, by Cytec, Inc.of Stamfbrd, the product of the trade mark that CT produces Parez750 by name, and authorized the United States Patent (USP) 4 of Bjorkquist on January 1st, 1991,981,557 illustrated resins.This patent is used as reference at this.

Improve absorbent properties if desired, can handle the creped tissue width of cloth of the present invention with surfactant.This surfactant preferably has the carbon atom alkyl chain more than eight or eight.Cationic surfactant as an example is the alkylsulfonate of straight chain, and alkylbenzenesulfonate.Non-ionic surface active agent as an example is an alkylglycoside, comprising the alkylglycoside ester, and for example by Croda, Inc. (New York, the product of the trade mark that NY) provides Crodesta SL-40 by name; Authorize the alkylglycoside ether described in people's such as WK.Langdon the United States Patent (USP) 4,011,389 on March 8th, 1977; And alkyl polyethoxy ester (alkypolyethoxylated esters), for example by Glyco Chemicals, Inc. (Greenwich, CT) the Pegosperse 200ML that provides, and by Rhone Poulenc Corporation (Cranbury, the product of the trade mark that NJ) provides IGEPALRC-520 by name.

The chemistry flexibilizing agent can be used as the component that selectivity is used.Operable chemical flexibilizing agent comprises known dialkyl dimethyl ammonium, chlorination two grease dimethyl ammoniums for example, methylsulfuric acid two grease dimethyl ammoniums, chlorination two (hydrogenation) grease dimethyl ammonium; Preferably adopt the Methylsulfate of two (hydrogenation) grease Dimethyl Ammonium.This raw material can adopt Witco Chemical Company Inc.of Dublin, the product of the trade mark that Ohio provides Varisoft 137 by name.The monoesters of biodegradable quartemary ammonium compound and diester variations can be used, and it belongs within the scope of the present invention.

The above-mentioned alternative chemical assistant that uses only is an illustrative, and it is not protection scope of the present invention to be constituted limit.The preparation of moisture paper making raw material

Those skilled in the art know that for wrinkling paper technology, not only the chemical constituent of paper making raw material is important, and in other factors, the relative amount of every kind of component and the time and the sequential scheduling that add also are very important.Following technology is well suited for the preparation of moisture paper making raw material, but this description is not scope of the present invention to be constituted limit, and protection scope of the present invention depends on specification back appending claims.

Adopt common pulping process in the prior art, single fiber is entered in the slurries, thereby at first prepare paper fibre.If desired, can make with extra care part selected in this paper making raw material.

In a kind of preferred mode, prepared a kind of short slurry of fibre length that contains bardwood pulp, prepared a kind of slurry of forming by longer paper fibre simultaneously again separately.Make the prepared short stock flow into the outer chamber of three layers of head box, to form the superficial layer in the three lamination thin papers, in thin paper, long stapled internal layer is the outer formation of inner cavity chamber in head box, and longer paper fibre slurry flows in this chamber.The tissue web of this filling is particularly suitable for changing into a kind of single thin layer paper product.

In the preferred mode of another kind, after the slurry of above-mentioned long fiber and staple fibre is made into, make short stock flow into a chamber of dual cavity head box, to form a lamination in the dual stack thin paper, long fiber layer wherein then is formed at the outside of head box second chamber, flows into long paper fibre in this chamber.This filling tissue web is particularly suitable for changing into a kind of two-layer multi-ply tissue product that comprises, wherein each layer all has certain direction, makes shorter paper fibre lamination be positioned at the surface of this bilayer tissue paper product.

Those skilled in the art also understand, as long as the moisture paper making raw material of same type flows into adjacent chamber, just can reduce the quantity of head box middle chamber.For example, as long as identical moisture paper making raw material flows in two adjacent chamber any one, just can be with three above-mentioned chamber head boxs as two chamber head boxs.Paper technology

Fig. 1 is a width of cloth schematic diagram of paper technology, and it shows the preferred embodiments of the present invention, wherein comprises the wrinkling new method of dry thin paper.1 pair of the preferred embodiments of the present invention describes below with reference to accompanying drawings.

Fig. 1 is the side view of a preferred paper machine 80, and it can be used for making paper web of the present invention.With reference to Fig. 1, paper machine 80 comprises multilayer head box 81 and fourdrinier wire 85, this head box has 82, one middle chamber 82b of a upper chamber, and a lower chambers 83, a weir plate top 84, fourdrinier wire 85 is an annular, and it is around breast roll 86, water fender 90, vacuum suction box 91, couch roll 92 and several operation rollers 94.During operation, paper making raw material pumps into by upper chamber, second paper making raw material then pumps into by middle chamber 82b, the 3rd raw material pumps into by lower chambers 83, and flow to the top of fourdrinier wire 85 thus from weir plate top 84 with the relation of levels, and form by lamination 88a 88b, the initial paper web 88 that 88c forms at this.Dewater by fourdrinier wire 85, and be subjected to the help of grade water plate 90 and vacuum tank 91.When fourdrinier wire during along the reversion shown in the arrow, above breast roll 86, pass and when beginning another circle at it, spray thrower 95 cleans it.At paper web transition range 93, by means of the effect of vacuum transfer case 97, initial paper web is transferred on the bearing fabric 96 of a porous.Bearing fabric 96 is carrying the paper web that comes from transition range 93 and is passing vaccum dewatering box 98, passes the predrying case 100 of the formula of blowing through once more, and through two operation rollers 101, thereby forming semiarid initial tissue web 106, it still is supported on the porous bearing fabric 96.When paper web was transferred to the Yankee dryer in down-stream after, by auxiliary operation roller 101, spray thrower 103, and vaccum dewatering box 105 had been finished its loop and bearing fabric 96 have been cleaned.

The use of the use polyvinyl alcohol creping adhesives of creping adhesives

The present invention has adopted a kind of polyvinyl alcohol creping adhesives.

Though the various modes that apply polyvinyl alcohol all can adopt, all be should be not excluded, but a kind of preferred mode of polyvinyl alcohol that applies is before semiarid tissue web is transferred, via the direct spraying polyethylene alcohol of the spray boom towards Yankee dryer surface.

With reference to Fig. 1, in this embodiment, the application point of polyvinyl alcohol is represented with spray boom 107.

Polyvinyl alcohol preferably accounts for the 30%-95% of the creping adhesives gross dry weight that is applied, and is better between 75%-85%, and according to the net weight of creping adhesives and paper web, the best 0.01lb/ton-10lb/ton of the scope of the creping adhesives that is applied.

Any polyvinyl alcohol that can form adhesive films may be used to the present invention.In the prior art, for example Bates is at United States Patent (USP) 3,926, and disclosed polyvinyl alcohol just is particularly suitable for the present invention and uses in 716.The solid polyethylene alcohol of commercial offers can be selected some kinds of trade mark brands for use, comprising AirProducts Company of Allentown, and the Airvol of PA., E.I.duPont de Nemours ofWilminton, the Elvanol of DE..These resins are easy to be dissolved in and form the aqueous solution in the water, and this aqueous solution also is easy to be sprayed on the Yankee dryer or on the half-dried tissue web.

This polyvinyl alcohol is a kind of polyvinyl acetate of partial hydrolysis preferably, and its degree of hydrolysis should be preferably between the 80-95% greater than 80%.

The viscosity of this polyvinyl alcohol is greater than 20cP, and is better greater than 35cP.The viscosity of 4% polyvinyl alcohol aqueous dispersion when the polyvinyl alcohol of this viscosity is equivalent to 20 degrees centigrade.

Adhere to by aqueous carrier as the employed polyvinyl alcohol of a part of the present invention.Solids content is preferably between the 0.05-2% at the place, application point.The use of the cationic polyamide resins creping adhesives of water-soluble HEAT SETTING

The present invention has adopted a kind of water-soluble, the cationic polyamide resins creping adhesives of HEAT SETTING.

Though the various modes that apply polyamide all can adopt, all be should be not excluded, but a kind of mode that preferably applies is before semiarid tissue web is transferred, and via a spray boom towards Yankee dryer surface aqueous dispersion is sprayed.

With reference to Fig. 1, in the preferred embodiment, the application point of the cationic polyamide resins creping adhesives of water-soluble, HEAT SETTING is with spray boom 108 representatives.

Of the present invention water-soluble, the cationic polyamide resins creping adhesives of HEAT SETTING accounts for about 5%-50% of the gross dry weight of the creping adhesives that is applied, and preferably is about 15-25%.Wherein, according to the net weight of creping adhesives and paper web, the scope of the creping adhesives that is applied is 0.1lb/ton-10lb/ton.

This class polyamide of commercial offers can be selected some kinds of trade marks for use, comprising Hercules Inc.of Wilminton, and the Kymene of DE, and Houghton Intemational Inc.of Valley Forge, the Unisoft of PA and Rezosol.These resins can use with the form supply of concentrated aqueous solution, only need to be diluted just to be easy to spray on Yankee dryer or the half-dried tissue web.

The basic chemical preparation process of the cationic polyamide resins creping adhesives of water-soluble, HEAT SETTING, the United States Patent (USP) of authorizing Kiem in February 23 nineteen sixty was authorized people's such as Kiem United States Patent (USP) 3 on October 16th, 2,926,116 and 1962, done fully open in 058,873.

In the preparation process of this resin, a kind of dicarboxylic acids at first reacts with polyalkylene polyamine, be preferably in the aqueous solution and carry out, and its reaction condition can produce a kind of water soluble polyamide that has following repetitive.

-NH(C _nH _2nHN) _x-CORO-

Wherein, n and x are respectively 2 or greater than 2, R is the divalence hydrocarbon-based of dicarboxylic acids.

By the reaction of water soluble polyamide and a kind of epihalohydrins, especially chloropropylene oxide, the preparation of this resin has just been finished, and has generated a kind of resin of water-soluble cationic HEAT SETTING.

The secondary amine of polyamide is preferably from a polyalkylene polyamine, polyethylene polyamines for example, and the polypropylene polyamines perhaps derives out in the polybutene polyamines.

Dicarboxylic acids is a kind of saturated aliphatic dicarboxylic acid, and it contains 3-10 carbon atom, butanedioic acid for example, adipic acid, azelaic acid etc., and their mixture.The dicarboxylic acids that contains 4-8 carbon atom is best.

Epihalohydrins and secondary amine ratio are preferably in 0.5: 1 to 1.8: 1 the scope in the polyamide.

The polyamide that uses as the present invention's part adheres to by water carrier.At the place, application point, its solid concentration is preferably between the 0.025-1%.

The application point of polyvinyl alcohol and polyamide is preferably on the desiccated surface of heating, is positioned at the place ahead of paper web bonding point; Certainly, the application point of above-mentioned two kinds of components also can be a paper surface, and it is positioned at before the bonding point of paper web and dryer.

The interpolation order of polyvinyl alcohol and polyamide can be different, when still preferably applying creping adhesives, applies polyamide again after applying polyvinyl alcohol.Can predict, so can form a kind of coating of layering, it contacts with the thin layer of polyamide type immediately.Paper web is bonded to the dryer surface of heat

In the present invention, semiarid tissue web is glued to a kind of dryer surface that is known as the heat of Yankee dryer by means of the creping adhesives that is applied in the previous steps.

Paper web bonds by contacting with the oven dry surface.What a relative cylinder is exerted pressure to it, and the partial desiccation paper web is bonded on the dryer uniformly.When paper web is crushed on the Yankee dryer surface, also can apply vacuum again to paper web.The present invention also can adopt a plurality of Yankee drying machine drums.

With reference to figure l, the partial desiccation paper web by the adhesives that is applied by means of spray boom 107 and spray boom 108 to the tube face of Yankee dryer 109, spray boom 107 is preferably with poly (vinyl alcohol) binder, spray boom 108 is preferably with cationic polyamide resins water-soluble, HEAT SETTING.Opposed cylindrical steel cylinder 102 can increase the cementation of paper web.Drying is finished by hot-air on steam-heated Yankee dryer 109, and wherein air is heated by unshowned device and circulates by drying hood 110.The scraper 111 that is called as creping blade after the paper web drying produces wrinkle on Yankee dryer 109, thereafter, just form designed paper web 70, and this paper web comprises Yankee side lamination 71, intermediate laminate 73, and away from Yankee side lamination 75.Paper web 70 passes through between roller 112 and 113 subsequently, walks around a part of circumferential surface of spool 115, is wound up into then on the fuse 117 that is placed in the rotating shaft 118, forms a winding up roller 116.By means of being called as second scraper that cleans cutter, excess coating can be removed from the dryer surface.

In addition, with regard to the processing conditions of making designed paper web 70, before wrinkling, it is about 80% that paper web preferably is dried to fiber content (fiber consistency), and 96% is better.

The present invention can be used for general wrinkling tissue web, comprising but be not limited to the conventional woollen blanket wrinkling tissue web that pressurizes, the closely knit wrinkling tissue web of high fluffy colored type, and high fluffy uncompacted wrinkling thin paper.

Its basic weight of wrinkling tissue web of the present invention is 10g/m ²-100g/m ²In its preferred embodiment, the basic weight of filling thin paper of the present invention is about 10g/m ²-50g/m ², be preferably 10g/m-30g/m ²The density that is suitable for wrinkling tissue web of the present invention is about 0.60g/cm ³, perhaps littler.In its preferred embodiment, the density of filling thin paper of the present invention is about 0.03g/cm ³-0.6g/cm ³, be preferably 0.05g/cm ³-0.2g/cm ³

The present invention can also be used for many laminations tissue web.Authorize people's such as Morgon Jr. United States Patent (USP) 3,994,771 on November 30th, 1976, authorized the United States Patent (USP) 4,300,981 of Ccarstens on November 17th, 1981, authorized people's such as Dunning United States Patent (USP) 4 on August 28th, 1979,166,001, and September in 1994 people such as disclosed Edwards on the 7th European patent publication No.0,613, among 979 A1, all the thin paper structure that is formed by stacked paper web is illustrated, above-mentioned document is used as reference at this.These laminations preferably include different types of fiber, and the fiber that uses in the preparation of many laminations thin paper has long cork fibrous and short hardwood fiber.Be suitable for many laminations tissue web of the present invention and comprise two laminations at least, be i.e. interior lamination and at least one outer lamination that links to each other with lamination in this.Many laminations thin paper preferably includes three laminations, i.e. interior lamination or intermediate laminate, two outer laminations, wherein in lamination outside two between the lamination.The basic fibre fractionation of two outer laminations preferably is made up of a kind of short paper fibre, and the average length of this fiber is between 0.5-1.5mm, preferably less than 1.0mm.These short paper fibres generally include hardwood fiber, hardwood kraft fiber preferably, fiber the best of being made by eucalyptus.The basic fibre fractionation of its internal layer preferably is made up of long paper fibre, and the average length of fiber is at least 2.0mm.These long paper fibres are generally cork fibrous, preferably northern kraft fibers.The most granular filler of the present invention is included at least one skin of multi-layer thin paper web of the present invention at least, preferably is comprised in two skins.

The wrinkling tissue web product of being made by single lamination or the wrinkling tissue web of many laminations can be the single thin layer paper product, also will be to be the multi-ply tissue product.

Its Apparatus and method for is that those skilled in the art are known.In a kind of typical technology, a kind of paper pulp raw material of low concentration is housed in the pressurization head box.This head box has an opening, is used for the paper pulp raw material that one deck approaches is coated on the fourdrinier wire to form wet web.Then the mode by vacuum dehydration with this wet web dewater to fibre concentration be 7%-25% (based on total weight in wet base).

A kind of better paper technology of the present invention comprises the method that is known as with closely knit colored type, and its design feature has the high fluffy district of low fibre density, in the fluffy district of height, and the array of the high density area that the high fibre density that distributes forms.A similar pillow zone, the fluffy district of this height.Compact zone is similar to hinge area.Compact zone can be to disperse at interval in fluffy district, also can interconnect, and both can be subrange, also can be whole.Preferably its high density area is continuous, and high fluffy district disperses.Authorize the United States Patent (USP) 3 of Sanford and Sisson on January 31st, 1967,301,746, authorized the United States Patent (USP) 3 of Peter G.Ayers on August 10th, 1976,974,025, authorized the United States Patent (USP) 4 of Paul D.Trokhan on March 4th, 1980, authorized the United States Patent (USP) 4 of Paul D.Trokhan on January 20th, 191,609,1987,637,859, authorize people's such as Wendt United States Patent (USP) 4,942 July 17 nineteen ninety, 077, September in 1994 people such as disclosed Hyland on the 28th European patent publication No.0617164A1, and September in 1994 people such as disclosed Hermans on the 21st European patent publication No.0616074A1 in the preferable production process with the tissue web of closely knit colored type is disclosed, above-mentioned all documents are used as reference at this.

In order to make the tissue web with closely knit colored type, in the paper web transfer step after being right after the Web forming process, paper web is sent to a forming fabric and is not a woollen blanket.Paper web is collocated on the supporter matrix of being made up of forming fabric.This paper web is pressing this supporter matrix, thereby at the regional area of paper web, promptly the binding site place corresponding to supporter matrix and wet web forms compact zone.In this process, the part of uncompressed just is equivalent to high fluffy district in the paper web.Can also for example adopt a kind of vacuum plant or a kind of dryer that penetrates by applying fluid pressure, the density in this fluffy district of height is further reduced.Paper web is dewatered, also can carry out predryingly sometimes, avoid the compression in this fluffy district of height basically.Preferably also be accompanied by fluid pressure this moment, for example adopts a kind of vacuum plant or a kind of penetration dryer, also can apply mechanical pressure to paper web facing to the supporter matrix, and wherein high fluffy district does not compress.In order to reduce the quantity of processing step, dewatering operation, the optionally formation of predrying and compact zone can be made up and be carried out or the part combination is carried out.To Yankee dryer surface branchpoint place, the moisture content of partial desiccation paper web when the partial desiccation paper web is positioned on the described forming fabric, makes hot-air pass described partial desiccation paper web, to form a kind of low density structures less than 40%.

The paper web that will have closely knit colored type is sent to and preferably avoids mechanical pressure when the Yankee dryer is dried.In the present invention, the 8-55% on best wrinkling thin paper surface is closely knit hinge area, and its density is at least 125% of high fluffy district density.

Preferably a kind of impression fabric of supporter matrix, it has the hinge area of arranging according to certain colored type dislocation, and under the situation of exerting pressure, they play the effect of the supporter matrix of the formation that helps compact zone.Hinge area flower type constitutes above-mentioned supporter matrix, impression fabric has disclosed in following document: authorized the United States Patent (USP) 3,301,746 of Sanford and Sisson on January 31st, 1967, authorized Salvucci on May 21st, 1974, people's such as Jr United States Patent (USP) 3,821,068, authorized the United States Patent (USP) 3 of Ayers on August 10th, 1976, authorized people's such as Friedberg United States Patent (USP) 3 on March 30th, 974,025,1971,573, authorized the United States Patent (USP) 3,473 of Amneus on October 21st, 164,1969,576, authorized the United States Patent (USP) 4,239,065 of Trokhan on December 16th, 1980, authorized the United States Patent (USP) 4 of Trokhan on July 9th, 1985,528,239, these documents are used as reference at this.

Preferably a kind of fluid pressure is applied on the paper web, thereby makes the surperficial consistent of initial paper web and a kind of drying/impression fabric with opening, it is predrying then described fabric to be carried out heating power, and this is a part of making low density paper technology.

Another kind of processing step of the present invention comprises and is called as the moulding that non-compaction moulding does not promptly have closely knit colored many laminations of type thin paper structure, for example, on May 21st, 1974 was authorized Joseph L.Salvucci, Jr. reach people's such as PeterN.Yiannos United States Patent (USP) 3,812,000, authorized HenryE.Becker on June 17th, 1980, the United States Patent (USP) 4,208,459 of Alberr L.McConnell and Richard Schutte is described such.Above document is used as reference at this.In general, many laminations thin paper structure of the no closely knit colored type of uncompressed can form a kind of wet web by a kind of paper making raw material being deposited on the circuit with holes as a fourdrinier wire, under the situation that does not apply mechanical pressure, this paper web is aspirated draining, make that the concentration of fiber is at least 80% in the paper web, carry out wrinkling to paper web then.Method with vacuum dehydration and heated drying is removed moisture from paper web.The structure that is generated is a kind of softness and fragility, the high fluffy paper web of fiber uncompressed.Be preferably in wrinkling before adhesive being applied on a part of paper web.

The advantage that the present invention brought comprises, because the bonding of page between creping doctor and the spool or control are improved, thereby can improve paper production speeds.

Though be not to wish to do theoretic explanation, but trying hard to be interpreted as what the present invention below can provide good cohesiveness.For cellulose, cationic polyamide resins is a kind of suitable adhesive, and a kind of quite high adhesion strength can be provided.Yet the heat-setting thin-film that it forms can not become wet again in follow-up process.Polyvinyl alcohol can become wet again, but for the partial desiccation paper web, its cohesiveness is relatively poor.The invention provides a kind of coating of layering, it utilizes polyamide as a kind of compounding ingredient, so that provide a kind of adhesion between partial desiccation paper web and polyvinyl alcohol base coating.The present invention helps simply to mix exist because polyamide is a form with dispersion coatings, it with the partial desiccation paper web between contact gear ratio it is more effective with mixing of polyvinyl alcohol, polyvinyl alcohol causes the reduction of its surface concentration.

" intensity " described herein is meant specific total TENSILE STRENGTH, and its assay method has illustrated at the latter half of specification.Tissue web of the present invention is very solid.Its specific total TENSILE STRENGTH is generally 0.25 meter, more preferably greater than 0.40 meter.

Tissue web of the present invention can be used for any needs softness, the occasion of bibulous tissue web.Tissue web of the present invention is particularly useful for making lavatory paper and napkin paper product.Can produce single-part stationery and multi-ply tissue product with tissue web of the present invention.

Analyze and test process

A. density

Multi-layer thin paper web density described herein is a kind of averag density, and it is the basic weight of paper and the merchant that thickness is divided by, and has wherein adopted suitable unit conversion.The thickness of multi-layer thin paper web is meant that at pressure load be 95g/m herein ²(15.5g/cm ²) condition under the thickness of paper.

B. molecular weight determines

The basic distinguishing characteristics of polymeric material is their molecular size.The character that can make polymer be used for different occasions mainly comes from their microcosmic molecular property.In order to determine fully the character of these materials, must need that some means limit and determine their molecular weight and the distribution of molecular weight.Utilize relative molecular mass more more correct, but in polymer technology, the latter is more general than molecule weight.In practice, the not often distribution of determining molecular weight.But when adopting chromatographic technique, it is very common that it just becomes.In addition, also represent molecular size with mean molecule quantity.

Mean molecule quantity

If we consider a kind of simple molecular weight distribution, its representative has the weight coefficient (wi) of the molecule of relative molecular mass (Mi), so just might determine the mean values that several are useful.With a kind of molecular number (Ni) that specifically is of a size of (Mi) is that the basis averages calculating, can draw the numerical value of mean molecule quantity. $\mathrm{Mn}=\frac{\mathrm{\ΣNiMi}}{\mathrm{\ΣNi}}$

An important results of this definition is to be the A Fujiadeluo number that the mean molecule quantity of unit comprises molecule with the gram.The definition of this molecular weight is corresponding to the molecule of single distribution, and promptly all molecules all have identical molecular weight.The more important thing is, if can adopt certain mode to determine the molecular number of a kind of polydispersion polymer colony, just then Mn can be easy to calculate.The basis of Here it is molecular number property testing.

Weight coefficient (Wi) with a kind of molecule of given material (Mi) is that the basis averages, and can draw the definition of weight average molecular weight $\mathrm{Mw}=\frac{\mathrm{\ΣWiNi}}{\mathrm{\ΣWi}}=\frac{{\mathrm{\ΣNiMi}}^2}{\mathrm{\ΣNiMi}}$

Mw is more more useful when expressing the molecular wt of polymer than Mn, because it can reflect more accurately such as characteristics such as the melt viscosity of polymer and mechanical performances, therefore is used among the present invention.

C. the dull and stereotyped flexible mensuration of thin paper

Before carrying out flexible test, preferably the sample of paper is adjusted according to Tappi method #T402OM-88.At this moment, in the relative humidity of 10-35%, preliminary treatment is 24 hours under 22-40 degree centigrade the condition earlier for sample.After the preliminary treatment,, handled 24 hours under 22-24 degree centigrade the condition again with the relative humidity of sample at 48-52%.

Be preferably in and carry out in a kind of room of constant temperature and humidity that flat board is flexible to be measured.If this condition can not satisfy, comprise all samples of tester, all should be under the identical environment.

Flexible test is to carry out with the form of paired comparison, it is similar to nineteen sixty-eight by ASTMSpecial Technical Publication 434, " the Manual on Sensory Testing Methods " that Americal Society For Testing and Materials publishes is described like that, and this book is used as reference at this.Adopt the method for testing that compares in pairs that flexibility is carried out subjective assessment.This method used a kind of from the outside standard near sample material.In order to feel flexible, select two samples for use, make the tester can not see sample, the tester selects one of them sample according to the flexibility that is touched.With reference to Panal ScoreUnit (PSU) report test result.With regard to flexible test,, need carry out the test of several times flexible flat in order to obtain the flexible data described in the PSU.In test each time, ten judge personnel be arranged, form three the relative flexibility of sample is estimated.When passing judgment on paired samples, pass judgment on a pair ofly at every turn, each sample in every pair of sample is passed judgment on respectively, they are denoted as X and Y respectively.In brief, according to following method each X sample is graded with respect to the Y sample paired with it:

If the evaluation X than Y a little softness a bit then be chosen as+1 grade, if the evaluation Y than X a little softness a bit then be chosen as-1 grade;

2.,, then be chosen as-2 grades if evaluation Y than the certain softness a little of X a bit if evaluation X than the certain softness a little of Y a bit then is chosen as+2 grades;

3.,, then be chosen as-3 grades if evaluation Y is many than the X softness if evaluation X many than the Y softness then are chosen as+3 grades;

4. if evaluation X is very more soft than Y integral body, then be chosen as+4 grades, if evaluation Y is very more soft than X integral body, then be chosen as-4 grades.

Above-mentioned rank is averaged, and the result is estimated in the unit of PSU.The result of gained is regarded as a dull and stereotyped test result.If a pair of above sample to having done evaluation, is then sorted to the right hierarchal order of these samples according to paired The result of statistics.Then, as required it is moved up and down in proper order, provide a 0PSU value, select a sample as the 0-basic standard.Be equivalent to the grade of 0-basic standard according to other samples, determine their positive and negative value.The mean value of dull and stereotyped test represents that its subjective sensation flexibility has tangible difference when 0.2PSU.

D. the mensuration dry tensile strength of tissue web intensity

Adopt a kind of Thwing-Albert Intelect II standard tensile test machine (Thwing-Albert instrument company, 10960 Dutton Rd., Philadelphia, PA, 19154) that 1 inch wide sample bar is carried out stretching strength determination.This method is used for finished paper, the test of spool sample and unconverted paper product.

The processing of sample and preparation

Before extension test, should handle the test pattern according to the method for Tappi Method#402OM-88d.Before test, must be with all plastics and careful the removing of paper mold packaging material from pattern.In relative humidity is 48-52%, and temperature is under 24-22 degree centigrade the condition pattern to be handled two hours at least.The preparation of sample and all test jobs all should be carried out in the room of constant temperature and humidity.

For final products, should remove the product of any damage.Next, take off 5 four available units (also being known as page), and with a top that is stacked to another, form one rectangularly, and between stacked page, bore a hole.Page 1 and 3 is made the machine direction extension test, and page 2 and 4 is made the cross machine extension test.Then, utilize a kind of hand papercutter (cutter of JDC-1-10 or JDC-1-12 band condom, by Thwing-Albert instrument company, 10960 Dutton Rd., Philadelphia, PA, 19154 make) to pass line of perforation and be cut into 4 independent material (stock).Confirm that the 1st and 3 material are used for the machine direction test, the 2nd and 4 material are used for cross machine.

From the 1st and 3 material, cut out two 1 inch wide paper slips along machine direction.From the 2nd and 4 material, cut out two 1 inch wide paper slips along cross machine.At this moment, had 41 inch wide paper slips and be used for the machine direction extension test, and 41 inch wide paper slips are used for the cross machine extension test.For these finished product samples, 8 all 1 inch wide paper slips all are 5 available units (being also referred to as page) thickness.

For unconverted paper and/or spool sample, with a kind of hand papercutter (cutter of JDC-1-10 or JDC-1-12 band condom, by Thwing-Albert instrument company, 10960 Dutton Rd., Philadelphia, PA, 19154 make) cut out the sample of 15 inches * 15 inches of 8 bed thickness from the interested part of sample.Determine that wherein one 15 inches length of sides are parallel to machine direction, another 15 inches length of sides are then perpendicular to machine direction.Guarantee that sample has been 48-52% in relative humidity, temperature be under 22-24 degree centigrade the condition balance at least 2 hours.The preparation of sample and all working relevant with extension test all should carry out under the condition of constant temperature and humidity.

Cut out 41 inch wide 7 inches long paper slips from the sample of 15 inches * 15 inches of this pretreated 8 bed thickness, wherein length is for 7 inches to extend along machine direction.It should be noted that these samples are spool sample or the unconverted patterns along machine direction.Cut out 41 inch wide 7 inches long paper slips again, length is for 7 inches to extend along cross machine.It should be noted that these samples are spool sample or the unconverted patterns along cross machine.Guarantee that above-mentioned all cuttings all are (cuttves of JDC-1-10 or JDC-1-12 band condom, by Thwing-A1bert instrument company, 10960 Dutton Rd., Philadelphia, PA, 19154 make) that utilizes that a kind of hand papercutter carries out.At this moment always have 8 samples: the paper slip that the length of 41 inch wide 7 inches long 8 bed thickness is extended along machine direction, and the length of 41 inch wide 7 inches long 8 bed thickness is along the paper slip of cross machine extension.The operation of extension test

In the actual measurement of TENSILE STRENGTH, employing be a kind of Thwing-Albert Intelect II standard tensile test machine (Thwing-Albert instrument company, 10960 Dutton Rd., P1iladelphia, PA, 19154).The plane folder is inserted in its operating unit, and given guidance is calibrated test machine according to Thwing-Albert Intelect II operation manual.The crosshead speed of instrument adjusted to 4.00in/min and be 2.00 inches the length adjustment of first and second measurers.The fracture susceptibility should be adjusted into 20.0 grams, and the width of sample is 1.00 ", thickness is 0.025 ".

Selected load cell, the expectation tension values that makes specimen is in the 25-75% of its test specification.For example, for estimating that range of stretch at the sample of 1250 grams (5000 grams 25%) to 3750 grams (5000 grams 75%), can use a kind of load cell of 5000 grams.Also stretching testing machine can be adjusted in the scope of 5000 gram load cell 10%, like this, just can test the sample that predetermined tension values is 125 grams-375 grams.

Take out a tensile bars one end is put into a clip of stretching testing machine, the other end of paper slip is put into another clip of stretching testing machine.Guarantee that the length direction of paper slip is parallel to the side of stretching testing machine.And guarantee that paper slip does not exceed any one side of two clips.In addition, the pressure of each clip must guarantee that it fully contacts with pattern.

After in will testing two clips of pattern insertion, just can the pulled out condition of instrument be monitored.If the numerical value that shows is 5 grams or bigger, then this sample is just too tight.Otherwise, if begin after the test, before any numerical value is recorded, there is the time cycle of 2-3 second, illustrate that then this stretching paper slip is too loose.

Service manual according to stretching testing machine starts stretching testing machine.When crosshead automatically returned to its initial position, test just was through with.With the gram is that its tensile load is read and write down by unit in the immediate unit from the scale of this instrument or the digital flat panel chi.

If the work that state is readjusted can not be carried out automatically by this instrument, then must carry out necessary adjustment work, the instrument clip is adjusted to its initial position.In a manner mentioned above with in two clips of another paper slip insertion, and with the gram is that unit reads its tension values.Obtain the tension values of all test paper slips.Should be noted that then this reading should be deleted if paper slip has taken place to slide or rupture in the limit of clip portion in test process.Calculate

For four 1 inch wide machine direction finished product paper slip, should at first try to achieve its four independently the tension values sum then with the number of test paper slip remove should and, this number is generally 4.Should and also should stretch the number of available units in the paper slip divided by every stretch-draw, for 1 layer and two-layer product, this number is generally 5.

Finished product paper slip for cross machine also repeats aforementioned calculation.

For the unconverted paper and the spool sample that downcut along machine direction, try to achieve its four independently tension values sums, with the number of test paper slip remove should and.This number is generally 4.Should and also should stretch the number of available units in the paper slip divided by every stretch-draw, this number is generally 8.

Unconverted paper and spool sample for cross machine also repeat aforementioned calculation.

All results are to be unit with gram/inch.

Example

Following example is used for practical operation of the present invention is made an explanation.This example is only with helping illustrate the present invention, in any case can not regard the qualification to protection domain of the present invention as.The present invention only is subjected to the qualification of appended claims.With reference to technology

The reference technology that following discussion is explained does not belong to feature of the present invention.

Utilize a kind of traditional pulper to produce the water slurry that concentration is about 3% northern softwood brown paper (NSK), and it is sent to the head box of fourdrinier by a paper pulp pipe.

In order to make finished paper have a kind of interim wet strength, to prepare 1% dispersant of a kind of National Starch Co-BOND1000, and it is added in the nsk pulp pipe, its speed is enough to realize that the net weight with the NSK fiber is the Co-BOND 1000 that l% is carried on the basis.The absorption of interim wet-strength resins is strengthened by making paper pulp after the processing pass a blender.

Nsk pulp is mixed with plain boiled water, and the place reaches about 0.2% concentration at the flabellum pump.

Adopt a kind of traditional paste mixer again to produce the water slurry that a kind of weight concentration is about 3% eucalyptus fibers.

Make this eucalyptus slurry pass a paper pulp pipe again and enter another desk fan leaf pump, with plain boiled water it is diluted to 0.2% concentration at this.

Make the NSK water slurry enter a multichannel head box with the eucalyptus slurry, it is equipped with the multilayer blade, so that make these liquid streams keep independently liquid layer, on the fourdrinier wire that is discharged into an operation.A kind of three chamber head boxs have been used herein.The eucalyptus slurry that contains paper product net weight 80% is sent to and passes in the two outer field chambers, and the NSK slurry that contains paper product net weight 20% then is sent in the chamber that passes to the ply of paper between the two eucalyptus layers.In the exit of head box, the NSK slurry mixes mutually with the eucalyptus slurry, forms a kind of mixed pulp.

This mixed pulp is sent on the fourdrinier wire of operation, under the help of baffle plate and vacuum tank, dewaters.

Some place at conveyer, concentration is that 15% initial paper web is transferred to from fourdrinier wire on the embossed fabrics, and this fabric is 5 shed open satin fabric constructions, and its machine direction of per inch length has 84 yarns, cross machine has 76 yarns, and has about 36% hinge area.

Further dewater by means of suction flat box, reach about 28% until fibre concentration.

Keeping and the contacted while of embossed fabrics, make embossed paper web predrying by the air that passes, thereby the concentration of fiber is reached about 62%.

By spraying a kind of creping adhesives that contains 0.25% polyvinyl alcohol water solution, making the partial desiccation paper web adhere to a diameter is on 10 feet the Yankee dryer.By a spray boom creping adhesives is sprayed to the surface of Yankee machine, on the whole width of dryer, this spray boom has three nozzles at interval.The model of nozzle is 650050, can be from Spraying Systems Inc.of Wheaton, and IL obtains.Nozzle is towards the surface of dryer, about 25cm from the surface.About about 1 meter of spray boom apart from the contact point of partial desiccation paper web and Yankee machine.Pressure in the spray boom is about 100psi.Under this pressure, nozzle approximately sprays creping adhesives with the speed of 17lb/ton, and above ratio is the amount of solid creping adhesives with respect to the paper web net weight.

Paper web done by a scraper from the Yankee machine wrinkling before, the concentration of fiber is enhanced about 96%.

The inclination angle of scraper is approximately 25 degree, and it forms the angle of shock of about 81 degree with respect to the Yankee dryer.

The speed that makes the Yankee dryer is 800fpm (feet per minute) (about 244m/ branch), thereby wrinkling percentage is adjusted to about 18%, and this moment, dried paper web was formed on the winding up roller with the speed of 656fpm (201m/ branch).

Place a web tension meter in the paper web stroke between creping doctor and spool, be used for detecting the tension force of paper web, determine degree of adhesion between paper web and the dryer with this.

With the paper web that generates be converted into three laminations, that individual layer is wrinkling, with the tissue paper product of closely knit colored type, the basic weight of this product is about the 18lb/3000 square feet.Technical process of the present invention

This part is noted that technical process of the present invention, and it has the advantage of dual layers of corrugated bonding system.

Form the partial desiccation paper web in the paper technology and repeat so that be sent to all steps of the desiccated surface of heat.Adopt this method, will form a kind of second predrying paper web, when paper web contacts with the embossing forming fabric, predryingly once more also just finished.This predrying process also is to be undertaken by the mode of air penetration, and the weight concentration of fiber is reached about 62%.

By spraying the dual layers of corrugated adhesive, making the partial desiccation paper web be adhered to diameter is on 10 feet the surface of Yankee dryer.

By spray concentration is 0.2% polyvinyl alcohol water solution, forms the ground floor creping adhesives.The trade mark of this polyvinyl alcohol is Airvol 540, is Air Products Company of Allontown, the product of PA..By a spray bars ground floor creping adhesives is sprayed onto the surface of Yankee drying machine, described spray bars has 3 nozzles, and they are arranged along the width interval of drying machine.The model of nozzle is 650050, and by Spraying Systems Inc.of Wheaton, IL provides.This nozzle is towards desiccated surface, and is positioned at the position from the about 25cm in surface.The position of spray boom is apart from about 1 meter of partial desiccation paper web and the contacted point of Yankee dryer.The pressure of spray boom is approximately 100psi.At this stress level, the speed of nozzle ejection creping adhesives is approximately: based on the net weight of paper web, and the adhesive of 1.4lb/ton.

But the aqueous solution that sprays a kind of concentration and be the cationic polyamide resins of 0.07% water-soluble HEAT SETTING forms second layer creping adhesives.This resin is Kymene 557H, is Hercules Inc.ofWilmington, the product of DE.By a spray bars second layer creping adhesives is sprayed onto the surface of Yankee drying machine, described spray bars has plurality of nozzles, and they are arranged along the width interval of drying machine.The model of this nozzle is 650050, and by Spraying Systems Inc.of Wheaton, IL provides.This nozzle is towards desiccated surface, and is positioned at the position from the about 25cm in surface.The position of spray boom distance first spray boom is about 25cm, is positioned near the point that the partial desiccation paper web moves to desiccated surface.The pressure of second spray boom is approximately 40psi.At this stress level, the speed of nozzle ejection creping adhesives is approximately: based on the net weight of paper web, and the adhesive of 0.3lb/ton.

Paper web with scraper before the Yankee dryer surface wrinkling, drying machine drum brings up to 96% with fiber content.

The oblique angle of scraper is approximately 25 degree, and it produces an angle of shock that is approximately 81 degree with respect to the Yankee dryer.

The speed of control Yankee dryer is 800fpm (foot/per minute) (about 244 m/mins), and wrinkling percentage is adjusted into about 18%, and this moment, dry-web entered take up roll with the speed of 656fpm (200 meters of per minutes).

A web tension meter is placed between creping blade and the spool, detects the tension force of paper web, thereby measure the degree of adhesion between paper web and the drying machine.

With paper web change into a kind of three laminations, individual layer is wrinkling, have closely knit colored type, basic weight is the tissue paper product of 18lb/3000 square feet.

When comparing with the present invention, with regard to available affirmation advantage of the present invention with reference to the result of technology.Bonding force between that the web tension meter is detected and the drying machine has tangible increase.TENSILE STRENGTH has reduced, and this just shows that cohesive force has increased.The test result of its thickness and flexibility can prove the superiority of this wrinkling tissue paper product manufacturing technique.

Although have higher bonding force, this duplex coating has scraping property of acceptable, changes scraper or with regard to the web breaks of adhesive associated, does not have tangible difference at two-layer process and between with reference to technology with regard to needs.

The spool quality of the wrinkling tissue web that the employing two-layer process is produced, just crooked and wrinkling viewpoint is better than with reference to technology.

	With reference to technology	The present invention
			Paper pull (g/in)	15.6	19.0
TENSILE STRENGTH (g/in)	431	400
			Thickness (mil)	11.3	11.1
Flexibility psu	0.0	+0.15

Claims (10)

1. one kind is carried out wrinkling method to paper web on the heated drying surface, it is characterized in that this method may further comprise the steps:

A., a kind of semiarid initial paper web is provided;

B. a kind of first creping adhesives is applied to heat desiccated surface on or on the described partial desiccation paper web, described first adhesive comprises polyvinyl alcohol;

C. a kind of second creping adhesives is applied to heat desiccated surface on or on the described partial desiccation paper web, described second adhesive comprises cationic polyamide resins water-soluble, HEAT SETTING;

D. by means of described first creping adhesives and second creping adhesives initial paper web of described partial desiccation is bonded on the described heated drying surface, finishes drying described initial paper web at this;

E. by a kind of flexible creping blade, make dry paper web wrinkling on described desiccated surface.

2. the method for claim 1, it is characterized in that, wherein added sufficient polyvinyl alcohol, the net weight of polyvinyl alcohol accounts for the 30-95% of the total applied amount of creping adhesives, preferable is 75-85%, simultaneously, has added the cationic polyamide resins of sufficient water-soluble, HEAT SETTING, the solid weight of polyamide accounts for the 5-50% of the solid weight of the total applied amount of creping adhesives, and preferable is 15-25%.

3. method as claimed in claim 1 or 2, the degree of hydrolysis that it is characterized in that described polyvinyl alcohol is 80-95%, its viscosity is greater than 35 centipoises.

4. as the described method of arbitrary claim among the claim 1-3, it is characterized in that described cationic polyamide resins water-soluble, HEAT SETTING is a kind of epihalohydrins and the product that contains the polyamide of secondary amine, described secondary amine is derived out by polyalkylene polyamide and saturated aliphatic dicarboxylic acid, and described dicarboxylic acids preferably contains 3-10 carbon atom.

5. method as claimed in claim 4 is characterized in that epihalohydrins wherein is a chloropropylene oxide, is 0.5 with respect to the usage ratio of secondary amine: 1-1.8: 1.

6. as the described method of arbitrary claim among the claim 1-5, it is characterized in that described polyvinyl alcohol sprays by a spray boom, locate in the application point, described polyvinyl alcohol is that concentration is the aqueous dispersion of 0.05-2%, described cationic polyamide resins water-soluble, HEAT SETTING sprays by a spray boom, at the place, application point, described polyamide is that concentration is the aqueous dispersion of 0.025-1%.

7. as the described method of arbitrary claim among the claim 1-6, it is characterized in that described partial desiccation paper web is by the preparation of flower type densification, when initial paper web is placed on when dewatering on the dry fabric that has the supporter matrix, just formed described partial desiccation paper web.

8. method as claimed in claim 7 is characterized in that described the dehydration passes through heat transfer realization to small part, promptly in paper web and contacted while of fabric, makes force air pass paper web.

9. as the described method of arbitrary claim among the claim 1-8, it is characterized in that in step b, by being sprayed onto, a kind of polyvinyl alcohol aqueous dispersion finishes applying of polyvinyl alcohol on the heated drying surface, in step c, after the polyvinyl alcohol spraying work of step b is finished, be lip-deep, perhaps spray on the described partial desiccation tissue web and finish applying of described polyamide by a kind of cationic polyamide resins aqueous dispersion water-soluble, HEAT SETTING is sprayed onto heated drying.

10. method as claimed in claim 9, the cationic polyamide resins that it is characterized in that described polyvinyl alcohol and described water-soluble, HEAT SETTING is realized spraying by spray boom independently, locate in the application point, the concentration of polyvinyl alcohol in aqueous dispersion is about 0.05-2%, at the place, application point, the concentration of polyamide in aqueous dispersion is about 0.025-1%.

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