ES2291237T3 - TISU PAPER STAMPED IN RELIEF AND WITH AN APPLIED LOTION. - Google Patents

Abstract

The present invention relates to a paper tissue, and in particular to facial tissue, and disposable handkerchiefs. Claimed and described is a method for making a tissue paper product from a tissue paper web, the method comprising the steps of: passing said tissue paper web through an embossing nip formed between a first and a second embossing roll, wherein at least one of said embossing rolls comprises at least 30 embossing elements per square centimetre. applying a transferable lotion to at least portions of said tissue paper web Further claimed are paper tissue products made in accordance with the above method.

Description

Tissue paper embossed and with a lotion applied

Field of the Invention

The present invention relates to products of tissue paper and in particular facial wipes and tissues disposable More especially, the invention relates to a tissue paper product with lotion comprising a substrate of tissue paper of better quality.

Background of the invention

Bands or sheets of paper, sometimes referred to as bands or sheets of tissue or tissue paper, and products made from from them, such as tissues, sometimes also called facial wipes, they are widely used in society modern These items, such as facial wipes, paper Toilet and kitchen paper, are commercial items of fiber cut, all of them mentioned herein as tissue paper products. It has long been recognized that some Important physical attributes of these products are their resistance and its thickness / thickness, its flexibility and softness, its absorbency and its frayed resistance. Research efforts and development have been aimed at improving each of these attributes without significantly affecting others as well as to improve two or three attributes simultaneously.

Flexibility and softness are related with the tactile sensation perceptible by the consumer when this take a certain product, rub it against the skin or wrinkle it In your hands. The tactile sensation is a combination of several physical properties The tactile sensation can be well reflected by the objective parameter of the physiological smoothness of the surface (PSS) as described, e.g. eg in 5,855,738. Just as important for the feeling. Consumer touch is the thickness / thickness of a product of tissue.

Resistance is the product's ability to maintain your physical integrity and not suffer tearing, bursting nor chopped into the conditions of use.

Absorbency is the measure of the ability to a product to absorb amounts of liquid, especially aqueous solutions or dispersions. The perceived general absorbency by the consumer it is generally considered to be a combination of the total amount of a liquid that will absorb a certain tissue paper mass until saturation as well as the speed at that said mass will absorb the liquid.

Fray resistance is the ability of a fibrous product and its constituent bands to stay united in the conditions of use, included in the wet state. In in other words, the higher the resistance to fraying, The lower the band's tendency to fray.

Products with high resistance to wet bursting and typically a relatively thick thickness High are those produced by countercurrent drying. Without However, counter current drying facilities are not available in conventional papermaking machines and the inclusion of these equipment means a considerable investment economical In another aspect, drying facilities to countercurrent have a higher energy consumption than more conventional drying facilities. Therefore still interesting to provide superior paper qualities using Conventional papermaking machines

The following state of the art presents improvements in at least some of the paper qualities before discussed by stages known in the art as stages of conversion, resulting in the conversion steps described especially useful for producing paper in a conventional way.

In WO 98/58124, published on December 23, 1998, a method of embossing is described where use embossing elements of a height of at least 1 mm

In EP 0 408 248, published on January 16, 1991, a conversion method is described in which a stage of Embossing is combined with a calendering stage simultaneous.

In EP 0 668 152, published on December 23, 1998, a method of embossing is described that uses male and female embossing elements not complementary with at least 15 different embossing elements per cm2.

In EP 0 696 334, published on March 10, 1999, a stage of embossing is described that avoids a bulk increase.

US-702 571 describes sheets of tissue with fine embossed designs that contain the minus 15 embossed prints per cm2.

US 5,855,738 describes a process for making soft tissue paper comprising a stage of calendered

The fact of provide facial wipes and tissues with additives to get skin care or pharmaceutical benefits, by example, in the form of lotions.

A state of the art representative of these Achievements is as follows:

In US-5 525 345, granted on 11 June 1996, a lotion is described to convey a touch smooth and lubricant. The patent includes a description of some of the negative effects of mineral oils that are commonly used in the art to transmit a touch softener. An important negative effect of this kind is that the mineral oil migrates easily and can pass, for example, to packing material or packaging of the staining tissue product these materials, so that it requires the use of materials special packing or packaging, such as barrier materials expensive To solve these negative effects the patent describes a lotion composition comprising up to 80% agents immobilizers

In WO 96/19204 a tissue paper with medicated lotion

In EP 0 808 157, granted on June 9, 1999, a medicated tissue paper product is described comprising a lotion that has solid and liquid components. The patent is refers to an economical lotion supply that can be obtained by an improved lotion composition.

The present invention attempts to improve the negative effects of highly transferable lotions providing a quality and paper structure especially suitable for paper Tissue with lotion, which still allows a very high production economical

In view of the state of the art and the Consideration mentioned above, there is still a need for a Tissue product, in particular a facial wipe, that:

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combine an optimal level of resistance, namely wet burst resistance, absorbency and fraying resistance

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also provide a tactile feeling of ideal flexibility, softness and thickness

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be cost-effective to manufacture and preferably can be manufactured in conventional papermaking machines

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provide care advantages of the skin

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allow the economic application of a lotion

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avoid a transfer of unwanted premature lotion and guarantee a good transfer of the lotion to the user in case necessary.

Summary of the invention

The present invention relates to a tissue paper and in particular to facial wipes and tissues. Be claims and describes a method to make a paper product tissue from a tissue paper band, comprising the method the stages of:

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happen said tissue paper band through a grip area of embossed pattern formed between a first and a second roller embossing, wherein at least one of said rollers of embossed printing comprises at least 30 stamping elements embossed per square centimeter.

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apply a transferable lotion to the fewer parts of said tissue paper band.

Tissue paper products are also claimed made according to the previous method.

Detailed description of the invention Appropriate papermaking stages

According to the present invention, it is wet laid a fibrous cellulose structure using principles and machines well known in the art of papermaking. A paste of paper suitable for the paper substrate preparation process tissue preferably contains papermaking fibers that basically they consist of cellulose fibers (usually known as wood pulp fibers) or fibers derived from cellulose (including, for example, rayon or viscose). Fibers derived from long fiber celluloses (gymnosperms or conifers) and short fiber celluloses (angioesperms or deciduous trees) are contemplated for use in this invention. The specific type of tree from which fibers are derived is irrelevant. Fibers Wood pulp can be produced from wood natural through any pasta making process suitable. Chemical processes such as processes based on Sulphite, sulfate (including Kraft) and soda are suitable. The mechanical processes such as thermochemical processes (or Asplund) They are also suitable. In addition, the different semi-chemical processes and Chemo-mechanics They are also contemplated for use in this invention the bleached fibers and the fibers not bleached Preferably no fibers are used. non-cellulosic, such as latex.

The tissue paper according to the present invention can contain, as a very preferred component, a chemical agent wet resistant. Preferably it contains up to about 3.0%, preferably at least 0.5%, and more preferably at least 0.8%, by weight, calculated with respect to dry fiber weight, of a state-resistant chemical agent wet, such as water soluble resin with a resistance permanent and temporary in wet state.

Resistant wet resins useful In the present invention they can be of various types. For example, Westfelt described a series of these materials and analyzed his chemistry in Cellulose Chemistry and Technology, volume 13, pages 813-825 (1979).

Resistant resins usually in condition Wet are water soluble cationic materials. That is, the resins are soluble in water when added to the paste for paper making It's quite possible, and even hopefully, that subsequent events such as crosslinking convert to the water insoluble resin. In addition, some resins are soluble only under specific conditions such as in a limited range pH It is generally believed that resistant resins in state moist suffer a cross-linking or other curing reaction after be deposited on, within or between the processing fibers of paper. Normally there is no cross-linking or curing if they are present significant amounts of water.

Of particular utility are the various resins of polyamide-epichlorohydrin. These materials are low molecular weight polymers provided with functional groups reagents such as amino, epoxy and acetidinium groups. The Patent bibliography is full of process descriptions to manufacture these materials, including US-A-3 700 623, granted to Keim the October 24, 1972, and US-A-3 772 076, granted to Keim on November 13, 1973.

The resins of polyamide-epihydrochlorine marketed with trademarks Kymene 557H and Kymene LX by Hercules Inc. of Wilmington, Delaware, are especially useful in this invention. These resins are generally described in the Keim patents mentioned above.

The resins of polyamide-epichlorohydrin with base activation useful in the present invention are marketed under the brand Registered Santo Res, such as Santo Re 31, by Monsanto Company of St. Louis, Missouri. These types of materials are described in general form in US-A-3 855 158, granted to Petrovich on December 17, 1974; US-A-3 899 388, granted to Petrovich on August 12, 1975; US-A-4 129 528, granted to Petrovich on December 12, 1978; US-A-4 147 586, granted to Petrovich on April 3, 1979; Y US-A-4 222 921, granted to Van Eenam on September 16, 1980.

Other useful water-soluble cationic resins in the present invention are polyacrylamide resins such such as those sold under the Parez trademark, such as Parez 631NC, by American Cyanamid Company of Sandford, Connecticut. These materials are generally described in US-A-3 556 932, granted to Coscia et al. on January 19, 1971; and US-A- 556 933, granted to Williams et al. on January 19, 1971.

Other types of useful water soluble resins in the present invention include acrylic and latex emulsions styrene-butadiene anionics. Numerous examples of these types of resins are provided in US-A3 844 880, granted to Meisel Jr et al. on October 29, 1974. Other water soluble cationic resins useful in this invention are the urea-formaldehyde and resin melamine-formaldehyde. These polymers Polyfunctional reagents have molecular weights of the order of some thousands. The most common functional groups include those that contain nitrogen, such as amino groups and groups methylol bound to nitrogen. Although less preferred, resins polyethyleneimine type are useful in the present invention.

More complete resin descriptions water-soluble mentioned above, including its manufacture, can be found in TAPPI Monograph Series No. 29, "Wet Strength in paper and Paperboard, Technical Association of the Pulp and Paper Industry "(New York; 1965).

Agents can also be optionally used with temporary resistance in the wet state, such as starch modified. Combinations of agents with permanent resistance and temporary resistance in the wet state.

The present invention may contain agents. Chemicals with dry strength resistance, preferably at a level up to 3% by weight, more preferably at least 0.1% by weight, calculated with respect to the weight of dry fiber. A chemical agent with Very preferred dry state resistance is carboxymethyl cellulose. Other chemical agents with dry strength resistance include polyacrylamide (such as combinations of Cypro ™ 514 and Accostrength? 711 manufactured by Wayne American Cyanamid, N.J, USA) .; starch (such as corn starch or starch potato); polyvinyl alcohol (such as Airvol ™ 540 produced by Air Products Inc. of Allentown, PA, USA); rubber bands carob or guar; and polyacrylate latex. The materials of Suitable starches may also include cationic starches. modified such as those modified to have groups that they contain nitrogen such as amino groups and methyl groups attached to nitrogen, marketed by National Starch and Chemical Company (Bridgewater, NJ, USA).

Chemical softening compositions that comprise chemical release agents are optional components of the present invention. In US-A-3 821 068, granted on June 28, 1974, describes that chemical release agents can be used to reduce the stiffness and therefore improve the softness of a paper band tissue. In US-A-3 554 862, granted on January 12, 1971, chemical agents of detached are described adequate. These chemical release agents include salts of quaternary ammonium

Chemical softening compositions Preferred comprise from about 0.01% to about 3.0% of a quaternary ammonium compound, preferably a biodegradable quaternary ammonium compound; and about 0.01% to about 3.0% of a polyhydroxy compound preferably selected from the group consisting of glycerols, sorbitols, polyglycerols that have an average molecular weight of about 150 to about 800, and polyoxyethylene glycols and polyoxypropylene glycols having an average molecular weight in weight of about 200 to 4000. Preferably the ratio of weight between the quaternary ammonium compound and the compound Polyhydroxylated is about 1.0: 0.1 to 0.1: 1.0. It has been discovered that the chemical softening composition is more effective when the polyhydroxy compound and the ammonium compound quaternary are mixed previously, preferably to a temperature of at least 40 ° C, before being added to the paste to Paper making Either additionally or in a way alternatively, chemical softener compositions can be applied to the practically dry tissue paper web, for example through a printing process (Note: all percentages in the This report is by weight of the dry fiber unless indicated otherwise).

Examples of quaternary ammonium compounds suitable for use in the present invention include products unmodified or mono-ester or di-ester variations of salts of dialkyl dimethylammonium and alkyltrimethylammonium salts well known. Examples include di-ester variations of di (hydrogenated tallow) dimethylammonium methylsulfate and di-ester di (tallow chloride) variations hydrogenated) dimethylammonium. Without pretending to impose any theory, it is believed that ester moieties confer biodegradability to these compounds. Commercial materials are marketed by Witco Chemical Company Inc. of Dublin, Ohio, with the name commercial "Rewoquat V3512". The details of procedures Analytical and test are presented in WO95 / 11343, published on 27 April 1995.

Examples of useful polyhydroxy compounds in the present invention include polyoxyethylene glycols having a weight average molecular weight of about 200 to about 600, being especially preferred "PEG-400".

Although the addition of certain agents Chemicals mentioned above as preferred agents may have very beneficial effects on the paper products obtained, mainly its softness, the tissue paper bands useful in the Present invention can be manufactured by any method usual well known to the person skilled in the art.

These papermaking processes comprise desiccation of suitable pulp using, for example, one or more felts and / or papermaking tapes. In the present invention conventional processes of paper making Any process mentioned herein Memory as conventional is a papermaking process that does not include a counter current drying stage. So alternatively papermaking processes can be used that They comprise a counter current drying stage.

Embossing stage with stretch

The present invention relates in particular to the steps known in the art as conversion stages.

An important conversion stage that should Performed in accordance with the present invention is a step of embossed stamping in which a very fine design is stamped using low pressure.

Embossing of a paper band tissue is usually achieved by passing the band through the area of grip formed between two embossing rollers, in where at least one embossing roll comprises embossing elements. A stamping roller in relief typically comprises a curved surface but by the rest smooth. Embossing elements are protruding protruding from this surface and having a certain height measured in a direction perpendicular to the axis of the roller embossed from the smooth curved roller surface to the highest point of the projection. Stamping elements in relief they have a certain width measured in the plane of the Roller surface practically smooth. The term width in the This report refers to the diameter of an element stamped on round relief measured in the plane specified above (it is say, at the bottom of the embossed element) or to the maximum width measured in said plane when the element stamped on Emboss is not round.

According to the present invention, the elements of Embossing can have any shape, such as pyramidal or hemispherical, and the cross section of the elements Embossing can be circular, oval or square. The Embossing elements can form a continuous design, but preferably they have different shape from each other.

According to the present invention, the elements of embossing are arranged on at least one roller of embossed with a very fine design, which comprises at least 30 embossing elements, preferably at least 50, more preferably at least 60, even more preferably at least 70, most preferably at least 80 elements, stamped on relief per square centimeter of specific roller surface Embossing

According to the present invention, the elements of Embossed patterns are not elevated, preferably have a height of less than 1 mm, more preferably less than 0.8 mm, even more preferably less than 0.6 mm, even more preferably less than 0.5 mm or less than 0.4 mm, and most preferably less than 0.3 mm

Preferably embossing with Stretching provides a relationship between patterned areas and non-stamped areas of 5% -95%, more preferably 20% to 80% and with maximum preference of 40% - 60%, that is, in the case more preferred 40% - 60% of the total specific surface area of the band Tissue paper is stamped.

Any type of embossing roller and known mode of operation of this roller is within the scope of the present invention. In a preferred embodiment of the present invention two embossing rollers of hard metal are used, for example, steel, wherein a first roller comprises protruding embossing elements, mentioned as a male roller, and a second roller comprises cavities of coupling, mentioned as female roller. The cavities can be a mirror image of the protruding embossing elements or they can be adapted to be slightly smaller than the exact mirror image, for example, presenting a slight difference in size or shape (for example, in slope) of the cavities of the
female roller

In another stage of embossing very preferred according to the present invention, a first roller of embossed pattern comprises a surface in contact with the hard metal band comprising stamping elements in relief protrusions and a second roller comprises a surface in contact with the band comprising a softer material, by example, rubber, preferably a Shore A hardness material 40-70, where cavities form when produces a sufficiently close contact with the elements of Embossed protrusions.

The size of the grip area formed between the Two embossing rollers must be adapted depending on, for example, of the tissue paper band that must be processed and in function of the embossing design used. Too depending on these considerations, pressure may be exerted light or null to force the first stamping roller in Emboss and the second embossing roller to join.

If two rollers are used in the process hard metal, one male and one female, the rollers should be operated so that there is a space corresponding to 60% - 140%, preferably 80% - 120%, of the thickness of the tissue paper without stamp between the protruding embossing elements of the male roller and the bottom of the female roller cavities.

If a hard metal roller is used together with a rubber roller, the rollers should be compressed one against another with a pressure of 0.1 MPa (10 N / square centimeter) at 10 MPa (1000 N / square centimeter), preferably 0.2 MPa (20 N / square centimeter) at 2 MPa (200 N / square centimeter) and with Maximum preference of 0.5 MPa (50 N / square centimeter) to 1 MPa (100 N / square centimeter).

Known modes of operation are suitable. for the present invention, preferably the rollers of Embossed patterns are not heated and move to it speed, but in alternative modes of operation at least one roller can be heated and the rollers can rotate to different speeds

In an important aspect embossing with a fine design described above it serves to increase the thickness or, in other words, the bulk of the tissue paper band. Therefore, in a very preferred mode of the present invention, pass a single band or a single layer of tissue paper through the Embossing grip area. In operating modes alternative, a multitude of layers can be passed at the same time of paper through the nib. However, and without intending to impose no theory, the applicant believes that embossing by deformation described herein achieves a stretch of tissue paper that produces a deformation but none significant densification of tissue paper and, therefore, the applicant does not consider the embossing method previously described very suitable for joining juxtaposed layers. On the contrary, it is contemplated to use a separate joining stage and different to provide a multilayer tissue paper product, the joining stage preferably comprising a stage of embossing, such as the "embossing" stage of union "described below.

Lotion Application

According to the present invention, before or after embossed with stretch, but most preferably after embossing with stretch, a tissue paper lotion. The lotion can be applied by any suitable medium, such as printing or spraying. The lotion can apply to the paper band or tissue paper product throughout the surface of the band or product or only part of it. In a multilayer tissue paper product the lotion can be applied to all layers or only to selected layers and only to one or both surfaces of the layers. In a preferred embodiment, the Lotion is applied to both outer surfaces of the product of tissue paper

It has been discovered that a lotion contributes to Smooth the tissue paper and therefore reduce its PSS parameter. In addition, the lotion has skin care advantages.

The lotion may comprise agents softeners / stripping agents, emollients, immobilizing agents and mixtures thereof. Softening / unlinking agents Suitable include quaternary ammonium compounds, polysiloxanes, and mixtures thereof. Suitable emollients include propylene glycol, glycerin, triethylene glycol, whale sperm or other waxes, petrolatum, fatty acids, fatty alcohols and ethers of fatty alcohol that have 12 to 28 carbon atoms in its chain of fatty acids, mineral oil, namely silicone oil, e.g. ex. dimethicone, and isopropyl palmitate, and mixtures thereof. Suitable immobilizing agents include ceresin, alcohol stearyl and paraffins, polyhydroxy fatty acid esters, polyhydroxy fatty acid amides, and mixtures thereof.

Other optional components include perfumes, antibacterial active substances, antiviral active substances, disinfectants, pharmaceutical active substances, formers film, deodorants, opacifiers, astringents, solvents and Similar. Particular examples of lotion components include Camphor, thymol, menthol, chamomile extract, aloe vera and Calendula officinalis.

According to the present invention, lotions are applied transferable and most preferably comprising components mentioned above, since transferability guarantees greater skin care and pharmaceutical advantages. He one skilled in the art knows how the indicated components affect to the transferability of the lotion, logically constituting a Critical parameter the amount of mineral oil included.

The expression "transferable lotion", in the present memory, refers to any lotion that reaches a transfer rate of more than 0.25% according to the test of transfer of stationary lotion on paper not stamped on relief described herein. Transferable Lotions preferred reach a transfer rate of more than 0.5%, more preferably more than 1%, 2% or 5%, depending on the test of transfer of stationary lotion on paper not stamped on relief described herein. The level of transferability can be relatively high to get from optimally the advantages associated with the lotion, since the most of the inconveniences so far associated with the use High amounts of a highly transferable lotion have been surpassed by the present invention.

Tissue paper data stamped on Stretch relief and non-stamped tissue paper stationary and dynamic conditions using the test method Described below:

100

The data obtained in the trial of lotion transfer described below confirm some of the beneficial effects of products made in accordance with The present invention. The product, which was embossed with stretching according to the present invention, provides a very low amount of lotion when in contact stationary with a surface, but provides an amount of Lotion far superior when rubbed on a surface.

Stationary contact with a surface is representative of the contact of a tissue paper product with the packaging material when the product is packaged. A low lotion transfer speed avoids the need to use expensive packaging material. Stationary contact with a surface is also representative of the contact of a product of tissue paper with the fingertips of a user when this Remove this tissue paper product from the packaging and prepare to use it, for example in the nasal area. Although typically the beneficial effects of a lotion will be desired in the area nasal, transferring the lotion to the fingertips of a user is not typically desired and is experienced as a unwanted greasy touch, which may even create the need for handwashing.

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Rubbing on a surface is representative of the use of a tissue paper product with lotion in the target area, which in most cases is the nasal area. A slight rubbing movement in the nasal area is a custom frequent, which logically can be improved by providing user the appropriate instructions for use.

If compared with a product not stamped on embossed, embossed product with stretch according to the present invention provides considerably less lotion when in stationary contact with a surface that embossed product with stretch. However, the lotion supply by a rubbing action It is not worse than in the case of a non-printed tissue paper product raised.

Preferred tissue paper products according to present invention will achieve a lotion transfer by rubbed that is at least 1.1 times, preferably 1.5 times, more preferably 2 times, 5 times or 7 times and most preferably at least 8 times, greater than the stationary transfer of lotion measured according to the test methods described to continuation.

Optional process stages

The method to make a paper product tissue according to the present invention may comprise a series of Other optional stages:

In the conversion process it can be used any known calendering method, although in accordance with the The present invention rarely uses high pressures of calendered Preferably the calendering stage is performed after embossing with stretch and before lotion application.

A calendering stage according to the present invention comprises passing one or several paper bands tissue through a calendering area formed between a first and second calendering rollers. Typically both calendering rollers come in contact along a certain length, herein referred to as length of contact, measured in parallel to the axis direction of said first calendering roller. The calendering rollers exert a pressure on the band of at least 30 N per centimeter of said contact length and for this they will be pressed one against the Another with this pressure. More preferably the pressure per centimeter of said contact length is 50 N to 300 N, plus preferably from 60 N to 250 N, even more preferably from 70 N to 200 N and most preferably from 120 N to 150 N. According to this invention, preferably so many paper bands will be calendered Tissue as layers comprises the tissue paper product, for example two, three or four bands can be juxtaposed and calendered in a stage

Known equipment and modes of operation known are suitable for the present invention, preferably the calendering rollers are not heated and move to it speed, but in alternative modes of operation at least one roller can be heated and the rollers can move to Different speeds

It is known in the art that calendering reduces the thickness of a tissue paper band and this is used in a way typical to ensure that the thickness of the tissue paper product Meet the necessary specifications.

Due to the pressure used, it produces a densification of the paper band, it is known that the calendering reduces the noticeable softness of a tissue paper product. He Calendering is therefore carried out at least in the paper sector hygienic, like tissue paper, at pressures not too much high and typically for a patterned paper band Select pressures from 10 N / cm to 20 N / cm.

When designing the present invention it has been observed surprisingly, the embossing stage specific claimed together with the specific calendering stage claimed produce a rather thick paper product and Bulky but nevertheless very soft.

More especially, it has been discovered that the tissue paper band after suffering a stamping stage in relief with stretching and a calendering stage presents greater thickness than the untreated band (when, for example, they undergo calendering three bands in one stage, three layers of untreated band with three layers of stamped and calendered band). This effect is especially surprising since a calendering to high pressure is known to significantly reduce the thickness of a paper band as, for example, described in the application DE-O patent 44 14 238.2.

It has been found that the method claimed in The present invention increases the thickness of a tissue paper web 10%, sometimes even 30% and even up to 40%, 60%, 80% or 100%, if you compare the thickness of the untreated band with the thickness of the treated band. The embossing stage with stretch alone achieves thickness increases typically 50% to 200%.

A tissue paper according to the present invention has a first and a second surfaces, the surfaces being opposite each other, and a thickness orthogonal to the first and second surfaces. The thickness is also mentioned as the thickness of the tissue. The thickness of a 3-layer tissue paper product according to the present invention is preferably from 0.1 mm to 1 mm, more preferably from 0.2 mm to 0.5 mm.

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In addition, a tissue paper according to the present invention preferably has a bursting resistance in wet more than 50 g, more preferably greater than 100 g, preferably from 150 g to 500 g and more preferably from 250 g to 400 g

It has been found that the method claimed in the present report produces a considerable reduction of the dry tensile strength of tissue paper without affecting negatively to the wet tensile strength of the paper tissue. Tissue paper treated with the claimed method typical achieves a dry tensile strength of 1000 g at 2500 g and a resistance to wet bursting from 100 g to 300 g and preferably reaches a relationship between resistance to dry traction and wet burst resistance of 0.1 to 0.3, preferably 0.125 to 0.25 and most preferably 0.15 to 0.2.

In another aspect, a tissue paper product according to the present invention preferably has a parameter of physiological smoothness of the surface of less than 1000 micrometers, preferably from 650 micrometers to 50 micrometers and more preferably from 650 micrometers to 300 micrometers.

In a preferred embodiment of the present invention, a two to four tissue paper product is provided layers, the three layers being more preferred. Preferably all the layers comprise an embossed design with stretching that extends by at least 50%, but preferably 80% of the entire specific surface of the tissue paper product and most preferably for the entire specific surface of the tissue paper product.

The juxtaposed layers of the tissue paper band can be joined to provide a tissue paper product multilayer, preferably by embossing union. The expression "embossed binding", herein memory refers to an embossed pattern by which all layers of a multilayer tissue according to the present invention are stamped in one stage of the process. Preferably stamping Embossed binding does not affect at all or at least only in small measure, to the smoothness of any calendered layer. So, preferably the tissue has a non-embossed surface in most of the surface of the tissue, preferably in the First and second surfaces. In this report, this means that the tissue has one or more regions that do not comprise a embossed binding and, optionally, one or more regions which comprise a relief embossing pattern, and that the region that Does not include a embossed joint print is at least 50%, preferably at least 80% and in some embodiments preferred of up to 99% of the specific tissue surface. In most of the regions that comprise a pattern in union relief are close to the edge of the tissue (for example along two or four edges); and they can also regions comprising a embossed joint pattern should be used for decorative purposes (for example to create a design or to highlight a logo or brand). The region that does not comprise a Embossing binding is the continuous region between and / or around the region comprising an embossed pattern of Union. Embossing binding is preferably performed by embossing steel-steel and pin-pin and with 10 to 40 elements of embossed per square centimeter and a height of 0.01 mm to 1 mm, preferably 0.05 mm to 0.2 mm. The percentage between Union embossed areas and areas not stamped on Embossed or embossed with a fine surface design specific total of a tissue paper product is preferably of 0.01% to 5%. Embossing binding involves a persistent densification of tissue paper product to get the Union. Therefore, the space between the element stamped on relief and its counterpart, for example, two pins when use pin-pin embossing, it is less than the thickness of the tissue paper to be stamped, of typically 5% to 50%, preferably 10% to 20%, of the thickness of the tissue paper that must be stamped, which produces pressures of embossed from 100 MPa (10,000 N / cm2) to 500 MPa (50 000 N / square centimeter).

The method of the present invention can also understand a step of providing suitable sheets for products of tissue paper, such as tissue paper. This stage of form Typical comprises cutting parts of the tissue paper band.

If desired, tissue paper products according to The present invention may be provided with functional marks or aesthetic Marks can be applied to one or both Tissue paper products surfaces. Brands can cover all or part of the tissue paper products and may be applied with a continuous or discontinuous design.

Brands can be applied to products of tissue paper by any means well known in the art, such as spraying, extrusion and preferably printing. May be used engraving or flexographic printing. If the printing as a means to apply the marks, the apparatus of print can be built according to the patent description of common attribution US-5,213,037, granted on 25 May 1993 to Leopardi, II. If desired, the device may have deposit partitions, as described in the attribution patent Common US 5,255,603, issued October 26, 1993 to Sonneville et al. If desired, brands may have perforations or removable cuts as described in the patent of common attribution US-5,802,974, granted on 8 September 1998 to McNeil. Patent descriptions before  mentioned are incorporated herein by reference memory.

Test methods Lotion Transfer Assay

The rehearsal is done in a room conditioned where the temperature is 22ºC + 2.2ºC and the humidity relative of 50% + 10%.

a) Objective

The objective of the test is to measure the amount of lotion transferred to a glass surface in conditions stationary and / or rubbed.

b) List of devices / materials

one.

License plate of glass measuring 20 cm x 30 cm or of known weight.

2.

Weight metal with a square surface in contact with tissue paper 2 cm x 3 cm.

3.

License plate 5 mm thick hard rubber with the same dimensions as the Glass plate.

Four.

Analytical balance (0.0001 g of resolution).

c) Sample preparation

Use a tissue paper sample that measures approximately 20 cm x 20 cm. Apply the lotion evenly spraying the sample and choosing a lotion form that an application of 10 g of lotion per meter is achieved square.

d)

i) Stationary test

Place the sample with lotion on the plate glass. Cover it with the hard rubber plate and place the weight metallic on it. The metal weight should exercise 9 kPa on the paper / glass surface.

Wait 15 seconds and carefully remove the Metal weight, hard rubber plate and paper. Now, measure the Weight of the glass plate. Subtracting the two weights (glass with lotion - glass without lotion) you get the amount of lotion transferred.

ii) Dynamic test (rub test)

Take the sample with lotion and wrap it around the surface in contact with the weight paper metallic The metal weight should exert 9 kPa on the paper surface (adjust the weight if necessary).

Place the metal / paper bar on a glass surface with a known weight and dimensions 100 x 30 mm surface.

Rub 10 times with a reciprocating motion along a length of 15 cm from the glass surface to a speed of 50 mm / sec. Then remove the metal bar with the attached paper and measure the weight difference of the plate glass.

f) Results

Repeat the test 10 times and take the average arithmetic as a result. Write down the average amount of lotion transferred in% of the amount of lotion comprised by the tissue paper product.

The thickness is measured according to the following procedure: the tissue paper is preconditioned at 21 ° C to 24 ° C and 48 to 52% relative humidity for two hours before measuring the thickness. If the thickness of the toilet paper is measured, 15 to 20 sheets are first removed and discarded. If the thickness of facial wipes is measured, the sample is taken from approximately the center of the package. The sample is selected and then conditioned for another 15 minutes.

The thickness of the multilayer tissue paper, in the present memory, is the thickness of the paper when subjected to a compression load of 14.7 g / cm2. Preferably the thickness It is measured with a Thwing-Albert low micrometer load, model 89-11, marketed by Thwing-Albert Instrument Company of Philadelphia, Pa. The thickness per layer is the total thickness of the tissue paper multilayer divided by the number of layers included. For a Monolayer tissue, thickness per layer and thickness are identical. In possible decorated areas, perforations, should be avoided edge effects, etc., of the tissue.

Wet burst resistance is measured using an electronic burst tester under the following test conditions. The apparatus for analyzing burst resistance is a Thwing-Albert Burst Tester Cat. No. 177 apparatus equipped with a 2000 g dynamometer sensor. The apparatus for analyzing burst resistance is marketed by Thwing-Albert Instrument Company, Philadelphia, PA 19154, USA.

Take eight tissue papers and stack them in two two. With scissors cut the samples so that they have approximately 228 mm in the machine direction and approximately 114 mm in the transverse direction to the machine, each with a thickness of two product units finish.

First age the samples during one or two hours joining the sample stack with a small clip for paper and "venting" the other end of the stack of samples to separate the leaves and allow air circulation between them. Suspend each stack of samples with a clamp in a forced draft oven at 107 ° C (± 3 ° C) for 5 minutes (± 10 seconds). After the warm-up period, remove the battery from oven samples and cool for at least three minutes before of performing the tests.

Take a sample strip holding the sample by the narrow edges in the transverse direction, submerge the center of the sample in a tray filled with approximately 25 mm of distilled water. Leave the sample in the water for four (4.0 ± 0.5) seconds. Remove and let drain for three (3.0 ± 0.5) seconds holding the sample so that the water drain in the transverse direction. Continue with the essay immediately after the draining stage. Place the sample wet on the bottom ring of the sample holding the device with the outer surface of the product facing above, so that the wet part of the sample covers completely the open surface of the ring that holds the sample. If there are wrinkles, discard the sample and repeat with a new sample. Once the sample is properly placed on the lower ring, turn the switch that descends the top ring The sample to be analyzed is now securely held in the sample fixation unit. Begin the burst test immediately at this point by pressing the start button. The plunger will start to rise. In the moment the sample is torn or broken, write down the maximum reading The plunger will change direction automatically and It will return to its original starting position. Repeat this procedure. with three other samples up to a total of four trials, it is say, 4 repetitions. Write down the results, as an average of the four repetitions, with an accuracy of one gram.

Dry tensile strength is measured according to the following procedure: the test is carried out on strips of paper of approximately 2.5 cm X 12.7 cm (one inch by five inches) (including wipes as described below as well like other sheets of paper) in a room equipped with a temperature of 28ºC + 2.2ºC and a relative humidity of 50% + 10%. Be uses an electronic modulometer (model 1122, Instron Corp., Canton, Mass.) Which operates at a speed of approximately 5.1 cm / min (2.0 inches per minute) and a reference length of approximately 10.2 cm (4.0 inches). The reference to a machine direction means that the sample analyzed is prepare so that the dimension 12.7 cm (5 inches) corresponds to this address. Therefore, for tensile strength in dry in the machine direction (DM), the strips are cut from so that the dimension 12.7 cm (5 inches) is parallel to the Address of the paper product manufacturing machine. For dry tensile strength in the transverse direction to the machine (DTM), the strips are cut so that the dimension 12.7 cm (5 inches) is parallel to the transverse direction to the paper product manufacturing machine. The terms address Machine (DM) and cross machine direction (DTM) are well known in the art of papermaking. The DM and DTM tensile strengths are determined using the previous equipment and performing calculations in a conventional manner, taking the arithmetic mean of at least six strips analyzed to Each directional resistance. Dry tensile strength, herein, it is the arithmetic mean of resistance to medium DM traction and average DTM tensile strength.

To measure the physiological smoothness of the surface, which provides the PSS parameter, a Tissue paper sample that does not show wrinkles, tears, perforations or major deviations from the macroscopic monoplanarity. The sample is conditioned from 22 to 24ºC and 48 to 52% relative humidity for at least two hours before rehearsals. The sample is placed on a table motorized and magnetically fixed in place. May select any side of the sample for measurement, always that all traces be taken from the same face.

The physiological smoothness of the surface is obtained by scanning the tissue paper sample in any direction with a profilometer to obtain the displacement in the Z direction as a function of distance. The displacement in the Z direction is converted to an amplitude versus the frequency spectrum by a Fourier Transform. The spectrum is then adjusted to the human tactile response using a series of filters. The peak heights of the filtered amplitude frequency curve are added from 0 to 10 cycles per millimeter to obtain the
Outcome.

The tissue paper sample, which has a size of approximately 100 mm x 100 mm, it is mounted on a motorized table Although any suitable table can be used, it You have noticed that a table with a checker is suitable model surface KES-FB-4NKES-SE, marketed by Kato Tech Company Limited of Koyota, Japan, or a table CP3-22-01 DCI Mini Precision with a two-axis stepper motor controller NuStep 2C NuLogic in closed loop control mode. The table has a constant drive motor that moves at a speed of 1 mm per second The sample is scanned 30 millimeters in the forward direction, cross-indexed one millimeter and then inverted The data is collected 26 millimeters from the center of scanning in both directions forward and backward. The first and last 2 millimeters of each scan are ignored and they are not used in calculations.

The profilometer has a probe with a radius of 2.54 micrometer tip and an applied force of 0.20 grams. He pressure range is calibrated for a total displacement in the Z direction of 3.5 millimeters. Within the distance of scanning the sample, the profilometer detects the displacement in the Z direction of the pencil in millimeters. The output voltage of pressure controller is digitized at a speed of at least 20 points per second. In the entire scan interval of 26 millimeters you get 512 pairs of surface height data depending on the time for the forward and reverse directions of a scan The profilometer is mounted on the sample table in a way that allows measuring surface topography. A Proper profilometer is a vertical displacement transducer EMD 4320 WI which has an EPT 010409 pencil tip and a analog amplifier EAS 2351. This equipment can be obtained from Federal Products of Providence, Rhode Island.

The digitized data pairs are imported to a conventional statistical analysis package for later analysis. Suitable analysis software packages include SAS from Cary, North Carolina, and preferably LabVIEW Instrument Control Software 3.1 marketed by National Instruments of Austin, Texas If LabVIEW software is used, the pairs of raw data linking the height of the surface to the time of individual scans are averaged using the Mean.vi analysis tool of LabVIEW software. 512 points of each of the 16 traces are converted to 16 spectra amplitude using the Amplitude and Phase tool Spectrum.vi. Each spectrum is then smoothed using the method. described by PROC Spectra Method of SAS software. Are used LabVIEW smoothing filter values of 0.000246, 0.000485, 0.00756, 0.062997, 0.00756, 0.000485 and 0.000246. The result of This tool is taken as Amp Spectrum Mag (vrms).

The amplitude data is then adjusted to the human touch response using a series of filters frequency designed from Verrillo data on vibration thresholds based on vibration frequency, as described in the Journal of Acoustical Society of America, in the article titled "Effect Of Contactor Area On The Vibrotactile Threshold ", vol. 35, 1962 (1963). The aforementioned data are registered in a temporary domain as cycles per second and converted to the space domain in cycles per millimeter. The factor conversion and filter values are in the procedure presented at the International Paper Physics Conference, TAPPI Book 1, more especially in the article entitled "Methods For The Measurement Of The Mechanical Properties Of Paper tissue "by Ampulski et al., Page 19, using the specific procedure presented on page 22 entitled "Physiological Surface Smoothness". The filter response set to 0 below the minimum threshold and above maximum response frequencies and ranges between 0 and 1, as described in the article by Ampulski et al. aforementioned.

Frequency amplitude adjusted data physiologically obtained by multiplying the amplitude spectra  described above for the appropriate filter value for each frequency. An amplitude spectrum and an amplitude spectrum Typical filtered are illustrated in Fig. 5 of the Ampulski article and cabbage. aforementioned. The adjusted frequency amplitude curve Verrillo adds point by point between 0 and 10 cycles per millimeter. This sum is considered as the physiological smoothness of the surface. The eight values of physiological smoothness of the direct surface and the eight values of physiological smoothness of the Inverse surface thus obtained are then averaged and recorded in micrometers.

Measurements of the physiological smoothness of the surface using SAS software are described in the patents of common attribution US-4,959,125, granted on 25 September 1990 to Spendel; US 5,059,282, granted on October 22, 1991 to Ampulski et al .; US 5,855,738, issued January 5, 1999 to Weisman et al., And US-5,980,691, issued on September 9 November 1999 to Weisman et al.

To measure the smoothness you can select any of the faces of the tissue, provided that all traces are Taken from the same face. If both sides of the tissue meet all the softness criteria mentioned herein, are considers that the entire tissue sample meets this criterion. Preferably both sides of the tissue meet the criteria previous.

Any co-assigned patent or Any patent application mentioned in this application Patent are incorporated by reference.

Claims (7)

1. A method of manufacturing a paper product tissue from a tissue paper band, said saying Method the stages of:

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happen said tissue paper band through a grip area of embossed pattern formed between a first and a second roller embossing, wherein at least one of said rollers of embossed printing comprises at least 30 stamping elements embossed per square centimeter.

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apply a transferable lotion to the fewer parts of said tissue paper band.

2. The method according to claim 1, characterized in that at least one of said embossing rollers comprises at least 50 embossing elements per square centimeter. 3. The method according to any of the preceding claims, characterized in that said embossing elements have a height of less than 0.5 mm. 4. The method according to any of the preceding claims, characterized in that said first embossing roller has a surface in contact with the web comprising a rubber material and said second embossing roller has a surface in contact with the web which comprises a hard metal. 5. The method according to any one of the preceding claims, characterized in that said step of applying a lotion to at least parts of said tissue paper band is performed after said step of passing said tissue paper band through a gripping zone Embossing 6. The method according to any one of the preceding claims, characterized in that the method further comprises a step of cutting sheets to provide tissue paper products. 7. A tissue paper product made according to a method of any of the preceding claims.