WO2001049936A1 - Procede d'application de produits chimiques sur des produits fibreux - Google Patents

Procede d'application de produits chimiques sur des produits fibreux Download PDF

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Publication number
WO2001049936A1
WO2001049936A1 PCT/EP2000/012851 EP0012851W WO0149936A1 WO 2001049936 A1 WO2001049936 A1 WO 2001049936A1 EP 0012851 W EP0012851 W EP 0012851W WO 0149936 A1 WO0149936 A1 WO 0149936A1
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WO
WIPO (PCT)
Prior art keywords
tissue
treatment
product
treatment chemical
chemical
Prior art date
Application number
PCT/EP2000/012851
Other languages
English (en)
Inventor
Wolfgang Tissauer
Peter Von Paleske
Original Assignee
Sca Hygiene Products Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sca Hygiene Products Gmbh filed Critical Sca Hygiene Products Gmbh
Priority to AU20116/01A priority Critical patent/AU2011601A/en
Publication of WO2001049936A1 publication Critical patent/WO2001049936A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/0208—Tissues; Wipes; Patches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q13/00—Formulations or additives for perfume preparations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper

Definitions

  • the present invention relates to a method of applying treatment chemicals to fiber-based planar produc t s, particularly tissue. It also relates to a device for performing the method and to the products made using same.
  • tissue especially includes "tissue paper” or "raw tissue", as i s normally produced as a one-ply tissue web in the tissue ( paper ) machine, as well as including multiply (interme d iate ) products, e.g.
  • tissue production is counte d among the pa p er making techniques .
  • the production of tissu e or more accurately, raw tissue if the one-ply (interme d iate) pro d uct manufactured on a special-purpose paper machine of the tissue or tissue paper machine is meant, is d elimite d from pa p er production as a result of the extremely low b asis we i ght of normally less than 40 g/m 2 and as a result of the much higher tensile energy absorption index as compare d to paper.
  • T he tensile energy absorption index is arrive d at b y relating the tensile energy absorption to the test sam p le volume before inspection (length, width, thickness of sample between the clamps before tensile load) .
  • Paper and tissue paper also differ in general with regard to the modulus of elasticity that characterizes the stress- strain properties of these planar products as a material parameter, depending on the production conditions, raw materials used and chemical additives.
  • a tissue paper's high tensile energy absorption index results from the outer and/or inner creping.
  • the former is produced by compression of the tissue paper web adhering to a dry cylinder as a result of the action of a crepe doctor or in the latter instance as a result of a difference in speed between two successive screens or e.g. between a sheet- forming screen and a so-called fabric or between two fabrics.
  • the so-called inner sheet-forming screen can thus be operated at a speed that is up to 40% faster than that of the next fabric or that of the subsequent felt, the initially formed and already pre-drained paper web being transferred to the next TAD fabric.
  • TAD through air drying
  • This transfer of a still plastically deformable paper web at a differential speed that simultaneously takes effect may also be brought about in other embodiments between a transfer fabric and the so-called TAD imprinting fabric or between two transfer fabrics.
  • German has adopted the English-language term "fabric" to designate paper machine covers that exhibit a screen-like fabric structure in which synthetic threads are used as a thread material instead of metal wires.
  • Most of the functional properties typical of tissue and tissue products result from the high tensile energy absorption index (see German standards DIN EN 12625-4 and DIN EN 12625-5) .
  • An example is represented by tissue products for hygienic applications (hygiene products, particularly hygiene paper products) which are e.g. used in personal grooming and hygiene, the household sector, industry, the institutional field in a very wide variety of cleaning processes. They are used to absorb fluids, for decorative purposes, for packaging or even just as supporting material, as is common for example in medical practices or in hospitals. In terms of their wide variety, hygiene products are now considered to be everyday products .
  • Hygiene paper primarily includes all kinds of dry-creped tissue paper, as well as wet-crep ⁇ d paper.
  • tissue paper or more accurately raw tissue paper.
  • the one-ply raw tissue may be built up of one or a plurality of layers respectively.
  • tissue products All one-ply or multiply final products made of raw tissue and tailored to the end user's needs, i.e. fabricated with a wide variety of requirements in mind, are known as "tissue products" .
  • tissue paper Typical properties include the ready ability to absorb tensile stress energy, their drapability, good textile-like flexibility, properties which are frequently referred to as bulk (crumple) softness, a high surface softness, a high specific volume with a perceptible thickness, as high a liquid absorbency as possible and, depending on the application, a suitable wet and dry strength as well as an interesting visual appearance of the outer product surface.
  • tissue paper to be processed into tissue products (tissue paper products) and are then available to end users in a wide variety of forms and fabrication, for example as wipes, towels, household towels, particularly as kitchen towels, sanitary products
  • the fiber-based planar product particularly tissue
  • the fiber-based planar product is frequently provided with substances, additives, auxiliary substances and other treatment chemicals .
  • this term will also cover any substance or blends of substances generally referred to as treatment chemicals and normally applied to the tissue after the drying and creping step on the yankee cylinder.
  • Treatment chemicals may have an influence on physical properties, e.g. softness, particularly bulk softness, strength in the dry and wet states, rate of absorption of liquids, particularly that of water or oil, or the structural strength of the tissue/tissue product itself, and/or they may contribute to their varying use, e.g. in the field of skin care and protection, healthcare, etc. "Lotions” are also particularly referred to in the latter case.
  • Household towels for example, particularly kitchen towels and to an even greater extent paper towels, require strength, especially in the wet state, and high suction capacity so as to satisfy consumer demands.
  • a combination of dry strength plus good softness is more likely to determine suitability in practice and acceptance among consumers.
  • tissue products such as handkerchiefs or facial wipes
  • surface softness and excellent suppleness are predominant properties which, in addition to strength, define the serviceability of these products.
  • Cosmetic components contained in the product though particularly present on its outer surfaces also play an important part in the latter tissue products.
  • Such cosmetic components include, inter alia, perfumes, moisturizers, skin care agents, healthcare substances such as panthenol or the active camomile ingredient bisabolol.
  • Softness is an important property of tissue products such as handkerchiefs, cosmetic wipes, toilet paper, serviettes/napkins, not to mention hand or kitchen towels, and it describes a characteristic tactile sensation caused by the tissue product upon contact with the skin.
  • softness is determined in practice by means of a subjective method. To do so, use is made of a "panel test" in which several trained test persons give a comparative opinion.
  • softness can be subdivided into its main characteristics, surface softness and bulk softness.
  • Bulk softness describes the feeling perceived when e.g. one's fingertips move lightly over the surface of the sheet of tissue.
  • Bulk softness is defined as the sensory impression of the resistance to mechanical deformation that is produced by a tissue or tissue product manually deformed by crumpling or folding and/or by compression during the process of deformation.
  • WO 94/05857 describes a method of applying a chemical paper-making additive to a dry tissue paper mat (tissue paper nonwoven fabric, raw tissue) .
  • the application technique is characterized by the following steps: provision of a dry tissue paper mat, dilution of a chemical paper-making additive using a suitable solvent to form a diluted chemical solution, the application of this diluted chemical solution to a heated transfer surface, partial evaporation of the solvent through the transfer surface to form a film that contains this paper-making additive and the transfer of this film from the heated transfer surface to the surface of the tissue mat.
  • EP-A-03 47 177 relates to a method of making soft tissue paper comprising the following steps: forming sheets from an aqueous suspension of cellulose fibers to form a mat, application of a sufficient amount of water-soluble non- cationic surfactant and drying and creping the mat, this tissue paper exhibiting a basis weight of 10 to 65 g/m 2 and a density of less than 0.6 g/m 3 .
  • the treatment solution can therefore be added both in the wet section of a tissue paper machine (wadding machine) , at the end of the screen section, before or inside the press section (mechanical drainage), i.e. in the case of solid contents between 20 and 50 %, and in the dry section disposed after the press section in the case of solid contents of 40 to 97 % fibrous dry weight.
  • the prior art is represented by feed sites on the transfer screen/belt, e.g. ahead of mat transfer in a TAD layout, and the supply to the moist fibrous mat after its transfer to the transport (dry) felt before the press or presses in a conventional single-felt or double-felt tissue machine.
  • the supply of treatment chemicals by spray application onto the yankee cylinder is also known in the prior art.
  • the addition of the treatment agent within the tissue making machine is brought about by spray application onto the pope roller to produce a film of treatment agent and subsequently to transfer it to the tissue web during rolling up.
  • the already creped "tissue web” usually still exhibits a residual temperature of between 20°C and about 70°C as a result of the preceding drying process on the yankee cylinder, which benefits the distribution of treatment agent and its penetration of the raw tissue.
  • centrifugal rotors or brush units In addition to spray application via a nozzle bar, the use of centrifugal rotors or brush units is possible. Application may also be effected directly onto the tissue paper web.
  • WO 98/41687 describes a method of making tissue products of the aforementioned kind, this method being characterized by the fact that a composition of the above type is applied to the fibrous mat or tissue web within the screen section, press section, TAD section, on the yankee cylinder and/or dry section, i.e. at a fibrous material density of 20 to 97 %, relative to the web's dry fibrous weight, in an amount of 0.1 to 40 %, preferably 1 to 20 %, continuously or discontinuously on or within the web and the web may undergo post-smoothing after application.
  • An alternative embodiment mentioned in this document relates to a method of making tissue products, this method being characterized by the fact that a composition of the above type is applied to the fibrous mat or tissue web after the dry section on the wadding machine, doubling machine and/or in the automatic processor in an amount of 0.1 to 40 wt . % , preferably 1 to 20 wt.%, continuously or discontinuously on or within the web and the web may undergo post-smoothing after application.
  • the known techniques suffer from various disadvantages that lead to an impairment of the tissue properties.
  • the pressure exerted on the tissue e.g. when using roller application techniques to apply the treatment agent, particularly during follow-up smoothing of the product treated with a treatment agent, causes the occurrence of undesirable mechanical effects upon the tissue.
  • the tissue is compressed, thereby decreasing e.g. its thickness (bulk), which consumers usually feel to be detrimental e.g. in the case of a paper handkerchief.
  • bulk thickness
  • Such a subjective impression on the user's part in the example of a thickness that is perceived to be detrimental may in turn wreck any objective improvement e.g. in surface softness, because consumers refuse to buy such a product. This is a problem that is particularly faced by multiply tissue products.
  • Roller or spray-on application is limited by the viscosity of the lotion to be applied.
  • Highly viscous and/or fatty lotions can be applied to paper by means of a spray technique only with extreme difficulty or not at all. It is therefore often necessary to use e.g. water or organic solvents to dilute or refine the treatment agent to be applied, entailing another process step in which the employed solvent has to be removed from the tissue once more.
  • composition of the treatment chemicals play an important part in the depth of penetration.
  • the known application techniques such as spray application and the various roller application techniques entail only inadequate control of the distribution of treatment chemicals, particularly in the z direction, i.e. perpendicular to the surface of the tissue. This problem arises with particular clarity in multilayer tissue fabrics.
  • the treatment chemicals applied to the surface penetrate into the tissue only to a slight extent, and often remain only on the top-most layer. Only a smaller part passes to the inner region.
  • softness-enhancing treatment chemicals sometimes also known as softness-promoting "lotions”
  • the desired effect of an improvement in bulk softness as a result of treating (applying lotion to) the tissue product can develop in this way only to an unsatisfactory degree.
  • the problem with tissue products that contain cosmetic treatment chemicals is the even distribution of the cosmetic components of the treatment agent on the external surfaces of the treated tissue product's outer plies.
  • cosmetic treatment chemicals sometimes also known as “cosmetic lotions”
  • the present invention object to make available a method that enables a controlled distribution of lotions in fiber-based planar products, particularly tissue, in every dimension, the distribution being optimized for each particular use, in order to introduce specific treatment chemicals, if necessary in large amounts too, and to improve the properties of the tissue products, e.g. bulk softness.
  • the treatment chemical to be applied or the blend of several treatment chemicals are present as a suspension of frozen, i.e. solid particles, with a controlled size distribution in a fluid and inert medium.
  • inert means that the medium does not react with the treatment chemical, and particularly does not dissolve the treatment chemical or does so only to a slight extent.
  • Liquid carbon dioxide which exhibits excellent dissolving properties for organic substances, is therefore normally out of the question as an inert medium.
  • the fluid medium also does not react chemically or physically with the fibers of the tissue product.
  • the fluid medium also has to be easily re-removable from the tissue.
  • the fluid medium is preferably liquefied nitrogen or liquid air. If using liquid air, safe handling must be ensured. Other freezing agents such as freon can, however, also be used so long as they are inert to the treatment chemicals to be applied and to the cellulose material, so long as they can easily be removed from the tissue and so long as they can be handled in an environmentally friendly way.
  • treatment composition covers any substance or blends of substances generally referred to as treatment chemicals of a planar fiber-based web. In the case of tissue this term relates to chemicals normally applied to the tissue after the drying and creping step on the yankee cylinder.
  • Treatment chemicals may have an influence on physical properties, e.g. softness, particularly bulk softness, strength in the dry and wet states, rate of absorption of liquids, particularly that of water or oil, or the structural strength of the tissue/tissue product itself, and/or they may contribute to their varying use, e.g. in the field of skin care and protection, healthcare, etc.
  • Adhesive compositions for laminating planar fibrous products which are typically not intended to influence the physical or chemical properties of fiber-based planar webs, in particular tissue, are consequently not to be understood as "treatment compositions" .
  • the treatment composition may comprise a single treatment chemical or a blend of at least two treatment chemicals.
  • This composition may also contain compounds that have no influence or only a slight influence on the properties of the treated planar product, particularly tissue, e.g. solvents (such as water and/or alcohol), auxiliary substances and/or additives. It may therefore be present e.g. as an aqueous solution or dispersion (e.g. suspension or emulsion) or comprise one or more treatment chemicals (water not included) .
  • Water may, however, also be an important active constituent of the treatment composition, particularly in cosmetic lotions intended to achieve a pleasant moist sensation on the skin. Water is then preferably used in combination with hygroscopic compounds such as the polyhydroxy compounds described below.
  • the proportion of optionally present solvents (including water) in the composition is preferably less than 60 wt.%, with greater preference on less than 30 wt.%, even greater preference on less than 10 wt.%, particularly less than 5 wt.%, each relative to the total weight of the composition.
  • the treatment chemical (s) may be selected from the following compound classes or compounds.
  • cosmetic lotions such as
  • moisturizers such as substituents for the skin's natural moisturizing factor (NMF) that contain e.g. cleavage products of collagen, glycerol etc.;
  • NMF skin's natural moisturizing factor
  • skin care agents e.g. long-chain fatty acid esters (like sorbitan fatty acid ester or Cetiol®) , lanolin or derivatives thereof;
  • fragrances e.g. natural, naturally identical or artificial perfumes
  • active cosmetic ingredients like D-panthenol or the active camomile ingredient ⁇ -bisabolol or agents exhibiting other functions, e.g.
  • strength-enhancing agents particularly wet-strength agents like epichlorohydrin resins or crosslinked polyalkylene amines,
  • agents that promote the softness (e.g. bulk softness or surface softness) of the planar product, particularly the tissue e.g. a polyhydroxy compound (e.g. ethylene glycol, propylene glycol, a liquid polyethylene glycol
  • the treatment composition comprises at least one of the following treatment chemicals: moisturizers, skin care agents, fragrances (aromatic principles), active medicinal and/or cosmetic ingredients, strength-enhancing agents, agents that promote tissue softness, and surfactants.
  • treatment chemicals include moisturizers, skin care agents, fragrances (aromatic principles), active medicinal and/or cosmetic ingredients, strength-enhancing agents, agents that promote tissue softness, and surfactants.
  • a preferred basic composition for improving softness, especially bulk softness comprises the following recipe: glycerol: 40 - 45 % propylene glycol: 28 - 30 % linden extract: 2.5 - 3.5 % water up to 100 %
  • the suspension is preferably produced by spraying the treatment chemical (s) into the fluid medium present at a temperature below the freezing point of the lotion.
  • the temperature of the fluid medium is preferably so low that introduction of the treatment chemical causes it to freeze immediately into solid particles.
  • the amount introduced is chosen to be so low that the viscosity of the suspension is essentially determined by the viscosity of the fluid medium.
  • the latter is preferably low and usually ranges from 1.0 to 0.1 mPas.
  • Liquid nitrogen as a fluid medium has a viscosity of 0.2 mPas.
  • the particle size and its distribution can be arbitrarily controlled by suitable selection of the spray nozzles. Effects of shearing forces (e.g. by means of an Ultraturrax) for further precise adjustment of the particle size are also possible, as is particle separation by screen techniques. Bimodal particle size distributions from one or more treatment chemicals can be set by selecting different nozzles or screen sizes, or by blending separately produced suspensions. In the case of high-viscosity treatment chemicals, the storage containers and feed lines for the treatment compositions as well as the spray nozzles can be heated.
  • the frozen particles are preferably present as an even suspension within the fluid medium. Agitation, e.g. by means of stirring devices or suitable flow control and a form of application system adapted thereto, prevents the frozen particles from being deposited in the fluid medium.
  • treatment chemicals exhibiting optionally different particle size distributions, may be present in the fluid medium.
  • the treatment chemical is applied in the form of ultrafinely dispersed particles in a frozen state. These particles behave "inertly", i.e. they do not exhibit the physical/chemical properties of the liquid treatment chemical, particularly not its viscosity. This permits even or gradual distribution of the treatment chemicals not only over the surface dimension of the tissue, but also across its depth which can be arbitrarily controlled irrespective of the chemical/physical properties of the treatment chemical.
  • the method according to the invention thus makes it possible to manufacture tissue products which contain highly viscous or fatty treatment chemicals.
  • the application of the fluid suspension medium to the tissue may be effected by spraying or dropping/pouring it onto the moving tissue web.
  • the tissue web is transported e.g. over a porous stationary plate (shoe) .
  • a moving screen is alternatively used as a supporting fabric.
  • the tissue web may also be guided through an immersion bath containing the suspension.
  • the particles essentially remain on the surface, or are more or less entrained far into the z direction of the tissue web and only then fixed. If e.g. the size distribution of the particles is much smaller than the mean pore size of the tissue web, it is evenly penetrated by the particles that are also essentially evenly fixed across the z direction.
  • any particles that have passed through the tissue web with the fluid medium can be supplied to a recycling stage like the medium itself. If there is a comparable particle size distribution and pore size distribution, a decreasing concentration gradient in terms of particle retention is set in the medium's direction of passage through the tissue web. Depending on the desired density and depth of application, it is left to the skilled person to set the parameters, here essentially the size distribution of the particles, the concentration of the particles in the fluid medium and the suspension's rate of passage through the tissue web. The latter can be set between merely drying out/pouring on and absorbing by suction the suspension as far as actively allowing it to pass through at a controlled throughflow rate.
  • the tissue web can simply be just passed through the immersion bath.
  • the web is first cooled down to the temperature of the fluid medium and is then completely soaked with the medium.
  • the particles from the treatment chemical remain on the surface of the tissue or, if there are small particle sizes, they penetrate deeper into the fiber structure of the tissue. This makes it possible to form a particle concentration gradient or to achieve even distribution.
  • the fluid medium is allowed actively to flow through the tissue web.
  • This can be effected by guiding the web over a suction screen roll.
  • the partial vacuum applied to the inside of the roll causes the medium to flow from the outside through the tissue web, this being supported by suitable measures such as a screen fixed to the supporting body of the suction roll.
  • a unit of several screen layers with varying fineness, i.e. mesh width causes the rate of flow to be additionally controlled by the corresponding resistance of passage through the screen (principle of bubbling through) . In doing so, a more even- application of the treatment chemical can be achieved.
  • Other screens or fabrics can also be guided externally on the tissue web. Choice of the mesh width can also control the size distribution of the frozen particles.
  • the direction of flow can be reversed by allowing the fluid medium to flow outwards from the interior of a large-pore roll, the tissue web being supported by a screen guided on the outside.
  • a gradient can be formed in terms of the deposition of frozen particles.
  • the tissue web is preferably guided in series via a plurality of rolls. If the direction of flow changes, the gradient is rebalanced and an even distribution. of particles within the tissue fabric is obtained in the z direction.
  • the tissue web is preferably pre-cooled before being guided into the immersion bath.
  • the treatment chemicals to be applied may contain further auxiliary substances and additives.
  • the amount of treatment chemical to be applied preferably ranges from 2 to 50 wt.-% relative to the dry weight of the tissue (oven-dried fibrous substance) .
  • the temperature of the treated tissue web is allowed to rise to a temperature above the melting point of the particles from the treatment chemical, preferably rising to room temperature.
  • This may optionally be effected by supplying heat, e.g. supplying heated air or infrared radiation.
  • heat e.g. supplying heated air or infrared radiation.
  • it may be necessary when the melting temperature of the treatment chemical is above room temperature.
  • the particles then melt, any concentration gradient being essentially retained.
  • the fluid medium is also removed or expelled.
  • the tissue web can be guided as a single ply or as multiple plies.
  • a plurality of one- ply tissue webs can alternatively be treated (one unwinding each) and then jointly rolled up into a multiply tissue product via a roll-up device.
  • the inner plies can be treated with a treatment chemical other than that for the outer plies.
  • the inner plies of a four-ply end product can remain untreated, or can be treated with a strength-enhancing agent, whereas the two outer plies were treated with a treatment chemical to improve surface softness.
  • an extremely wide variety of combinations of differently treated tissue plies is conceivable.
  • the present invention also relates to a fiber-based planar product that contains a treatment composition; this product can be obtained according to a method that comprises the steps described above.
  • tissue as defined by the present invention is understood as any kind of creped paper made from an aqueous dispersion and having a basis weight range of usually between 10 and 65 g/m 2 . in accordance with the invention, the term “tissue” covers both
  • raw creped paper also known as "raw tissue”, particularly the range of dry-creped raw tissue paper, regardless of whether they are single-layer or multilayer, • and any single-layer or multilayer end products made of this creped raw paper.
  • Raw tissue is usually made as a one-ply tissue web in the tissue (paper) machine or as an optionally multiply (intermediate) product, e.g. in the form of multiply doubled webs or in the form of master rolls for further processing.
  • layers refers to a change in chemical and/or physical properties within a tissue ply; such a change may be caused e.g. by a different fiber composition. In contrast to plies, layers usually cannot be separated from one another.
  • the final product is preferably
  • a cleaning wipe e.g. wiping paper, a windscreen cleaning wipe, a cleaning wipe for industrial applications, a towel or a cleaning wipe for household use, e.g. kitchen paper;
  • a sanitary product e.g. toilet paper (also moist);
  • a tissue for facial use e.g. a makeup removal tissue (facial) or cosmetic tissue
  • a makeup removal tissue facial
  • cosmetic tissue e.g. a makeup removal tissue (facial) or cosmetic tissue
  • a garment e.g. disposable apparel for hospitals or kitchen staff.
  • tissue products are handkerchiefs, tissues for facial use, sanitary products (e.g. toilet paper) and towels in which the application of cosmetic treatment compositions and/or treatment compositions that convey softness (lotions) plays a part.
  • tissue paper must also be regarded independently of the fibrous raw material to be used, particularly irrespective of whether the fibrous raw material is made solely or mainly from natural pulps e.g. according to the sulfate or sulfite process, or is used in a mixture with chemothermomechanical wood pulps (e.g. CTMP, or HTCMP) , or whether the fibrous raw material used comes from a secondary fiber refinement process and whether the fibrous raw material needed to make tissue therefore completely or partially comprises "recycled fibers".
  • CTMP chemothermomechanical wood pulps
  • tissue paper manufacturing a proportional use by refinement of modified pulp fibers in a range of 10 to 50 %, relative to the total weight of the fibers, or even a use of synthetic fibers suitable for paper making in an amount of 10 to 30 % are covered by the aforementioned definition of the term "tissue". It is analogously possible to apply the method beyond the field of paper making to corresponding fields in the nonwoven and textile sectors.
  • the treatment composition Upon application of the treatment composition, it is possible to start out e.g. from a multiply, usually two-ply to four- ply or multiply (doubled) master roll produced in a separate doubling machine.
  • a plurality of one-ply tissue webs can alternatively be treated (one unwinding each) and then jointly rolled up into a multiply tissue product via a roll- up device.
  • the inner plies can be treated with a treatment chemical other than that for the outer plies.
  • the inner plies of a four-ply end product can remain untreated, or can be treated with a strength-enhancing agent, whereas the two outer plies were treated with a treatment chemical to improve surface softness.
  • an extremely wide variety of combinations of differently treated tissue plies is conceivable.
  • the tissue is a four-ply or three-ply doubled raw tissue for making handkerchiefs or facials, the tissue being made available in the form of master rolls for the application of a treatment composition in a processing machine suitable for this purpose.
  • the processing machine comprises at least one unwinding device for the master rolls, a roll-up device for the product finished after application of a treatment agent, and an interposed applicator for applying the treatment composition.
  • Tissue normally contains so little water that even when it has been substantially cooled, i.e. in liquid air, it still remains sufficiently flexible while retaining dimensional stability, enabling it to be guided at a high speed over corresponding transport devices.
  • An entirely desirable effect may accompany the partial breaking up of the fiber/fiber bond, caused by frozen residual moisture in the used tissue. This breaking up, which may occur upon movement of the frozen paper web, e.g. as a result of flexing and bending work during rotation around revolving rolls, renders the tissue softer (softener effect) .
  • the method according to the invention makes it possible for the tissue products obtained to exhibit improved bulk softness and to have even or gradual distribution of the introduced treatment chemicals.
  • the characteristic properties of the tissue products can, as a result, be improved.
  • the method according to the invention is preferably performed within a by and large sealed system to enable the fluid medium and non-applied particles to be re-used or disposed of in an environmentally friendly manner.
  • the present invention also relates to a device suitable for performing the method according to the invention.
  • the device comprises a unit for producing the suspension of treatment chemical (s) and the fluid medium.
  • the particles from the treatment chemical having a specific size are produced here as a suspension in the fluid medium.
  • the temperature within this unit should be between -200 and -100°C.
  • the device also contains an application unit in which the treatment chemical is placed onto and into the tissue, e.g. an immersion bath or a throughflow device.
  • an application unit in which the treatment chemical is placed onto and into the tissue, e.g. an immersion bath or a throughflow device.
  • the tissue products according to the invention are e.g. applied in personal grooming and hygiene, particularly after application of cosmetically active substances.
  • the tissue products according to the invention Upon application of normal emollients, the tissue products according to the invention exhibit bulk softness that is improved as compared to classic application techniques and need not subsequently undergo any post-smoothing or only undergo minimum post-smoothing (otherwise normal curling effect) .
  • the same amount of lotion to be applied is much less noticeable in the tissue product of the invention than in conventional tissue products.
  • a cream lotion is used as a treatment chemical to be applied.
  • the lotion is kept homogeneous and at a constant temperature in the storage container 1 by means of a heater 3 and a stirrer 2.
  • the lotion whose temperature is regulated by the heater, is guided through the conduit 4 to the area 5 by means of the temperature-regulated spray nozzles 6.
  • These spray nozzles are used to spray the lotion into the fluid medium, preferably liquid nitrogen, present in the container 9 cooled by cooler 7.
  • the particle size distribution of the frozen lotion particles can be controlled by adjustment of the spray nozzles.
  • This suspension is kept as a homogeneous suspension with the aid of a stirrer 8.
  • the resultant suspension of fluid medium and lotion particles is passed via the conduit 10 to the vacuum suction means 11.
  • the vacuum suction means 11 is used to suck the suspension of liquid medium containing the deep-frozen lotion particles through the tissue web 12, thus causing the lotion particles to remain on and within the tissue.
  • the tissue is then adjusted to room temperature 13 by means of air.
  • the liquid medium that may also contain particles of the lotion to be applied is supplied back through the conduit 14 to the container 9.
  • the application of the suspension of lotion and liquid medium is effected by means of a suction screen roll 16.
  • the suspension is passed out of the tank 9 via the conduit 10 into an immersion bath 18.
  • the tissue web is guided through this immersion bath 18 over a suction screen roll 17.
  • the suspension is kept as a homogeneous suspension by means of the stirrer 17.
  • the suction screen roll is used to draw the suspension through the tissue web. Lotion particles remain in the tissue web, whereas the liquid medium that may still contain residual lotion particles is supplied back through the discharge conduit 14 to the tank 9. Any unconsumed suspension can also be supplied back to the tank 9 via the conduit 15.
  • the obtained tissue web is again adjusted to room temperature by means of hot air 13, any remaining medium being expelled and the frozen lotion particles melting within the tissue.
  • the applied amount of softness-enhancing treatment chemical was determined in a multiply tissue product in individual plies, i.e. depending on the z direction.
  • a suspension of very fine particles of treatment chemical that exhibited a smaller particle size distribution than the pore size distribution of the tissue was applied to 4-ply paper handkerchiefs.
  • the lotion was applied in liquid form by means of a normal spray technique. After thawing or spraying on, the samples were kept at room temperature for two weeks.
  • a panel test showed that the tissues treated using the method according to the invention reached greater softness than those that had been treated using conventional spray techniques .
  • Sample A is the paper treated in accordance with the invention
  • sample B was treated conventionally.
  • the plies were numbered such that the 1st ply is the outer ply on the application side of the paper.
  • the 4th ply is the outer ply opposite the application side.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Dermatology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Birds (AREA)
  • Epidemiology (AREA)
  • Paper (AREA)
  • Sanitary Thin Papers (AREA)

Abstract

La présente invention concerne un procédé d'application de produits chimiques de traitement sur un produit plat fibreux, en particulier du papier, ledit procédé consistant a) à produire une suspension de particules congelées d'une composition contenant au moins un produit chimique de traitement dans un milieux inerte liquide avec une température à laquelle le produit chimique de traitement est présent à l'état congelé, b) à appliquer la suspension obtenue dans l'étape a) sur le produit plat, c) à éliminer le milieu liquide restant dans les produits plats afin de maintenir les particules congelées dans le produit plat, et d) à augmenter la température au-dessus du point de fusion des particules du produit chimique de traitement. L'invention concerne également un appareil utilisé avec ce procédé et un produit plat fibreux obtenu par ce procédé. Le procédé de l'invention est particulièrement adapté pour l'application de produits chimiques de traitement possédant des propriétés chimiques ou physiques difficiles à harmoniser lors de l'application desdits produits chimiques.
PCT/EP2000/012851 1999-12-30 2000-12-15 Procede d'application de produits chimiques sur des produits fibreux WO2001049936A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20116/01A AU2011601A (en) 1999-12-30 2000-12-15 Method of applying chemicals to fibrous products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19963835.7 1999-12-30
DE1999163835 DE19963835C2 (de) 1999-12-30 1999-12-30 Verfahren zur Applikation von Behandlungschemikalien auf flächige Erzeugnisse auf Faserbasis, insbesondere Tissue, und damit hergestellte Produkte

Publications (1)

Publication Number Publication Date
WO2001049936A1 true WO2001049936A1 (fr) 2001-07-12

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Country Link
AU (1) AU2011601A (fr)
DE (1) DE19963835C2 (fr)
WO (1) WO2001049936A1 (fr)

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WO2022070733A1 (fr) * 2020-09-30 2022-04-07 大王製紙株式会社 Papier de soie et produits en papier de soie

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DE10234257A1 (de) * 2002-07-27 2004-02-05 Beiersdorf Ag Selbstwärmende Substrate
DE102006022201A1 (de) * 2006-05-12 2007-11-15 Kremer, Jens Fliesslinien- und Kristallisationsbeschreibung
EP3231939A1 (fr) 2016-04-11 2017-10-18 Fuhrmann, Uwe Mouchoir en papier multicouche destine a reduire la transmission d'agents infectieux

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ATE144568T1 (de) * 1992-08-27 1996-11-15 Procter & Gamble Verfahren zum aufbringen von chemischen papierherstellunghilfsmitteln aus einem dünnen film zum tissue papier
US5312522A (en) * 1993-01-14 1994-05-17 Procter & Gamble Company Paper products containing a biodegradable chemical softening composition
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DE19711452A1 (de) * 1997-03-19 1998-09-24 Sca Hygiene Paper Gmbh Feuchtigkeitsregulatoren enthaltende Zusammensetzung für Tissueprodukte, Verfahren zur Herstellung dieser Produkte, Verwendung der Zusammensetzung für die Behandlung von Tissueprodukten sowie Tissueprodukte in Form von wetlaid einschließlich TAD oder Airlaid (non-woven) auf Basis überwiegend Cellulosefasern enthaltender flächiger Trägermaterialien

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US4339479A (en) * 1966-01-24 1982-07-13 Edward Robbart Treatment of cellulose
US5114748A (en) * 1989-12-08 1992-05-19 Taiyo Sanso Co. Ltd. Method of preparing or rubbing a substrate to be used in a lcd device by spraying it with uniformly sized droplets or frozen water

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022070733A1 (fr) * 2020-09-30 2022-04-07 大王製紙株式会社 Papier de soie et produits en papier de soie
JP2022057348A (ja) * 2020-09-30 2022-04-11 大王製紙株式会社 ティシュペーパー及びティシュペーパー製品
JP7343458B2 (ja) 2020-09-30 2023-09-12 大王製紙株式会社 ティシュペーパー及びティシュペーパー製品
EP4023122A4 (fr) * 2020-09-30 2023-09-13 Daio Paper Corporation Papier de soie et produits en papier de soie

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AU2011601A (en) 2001-07-16
DE19963835C2 (de) 2002-03-28

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