MXPA01000459A - Tissue with strikethrough resistance - Google Patents

Abstract

A toilet tissue product (20) may include a first cellulosic ply (22) and a second cellulosic ply (26). Desirably, the first cellulosic ply further includes a single layer (24) and the second cellulosic ply further includes a single layer (28). At least one ply may have a region (30) that prevents fluid from striking through the tissue product.

Description

TISU WITH RESISTANCE TO TRANSFER CROSS REFERENCE TO RELATED REQUESTS This application is a continuation in part of the patent application of the United States of America series No. 08 / 638,522, filed on April 26, 1996.

FIELD OF THE INVENTION This invention relates generally to the field of papermaking, and more specifically to a tissue co-transfer resistance.

BACKGROUND During cleansing after urinating, the amount of tissue used can be highly variable, but generally about 12 to 15 tissue sheets per event are used to absorb about 1 milliliter of urine. This amount of tissue is about 14 times the actual amount needed based on the absorption capacity of the tissue. Using this amount of excess tissue prevents urine from penetrating through the tissue sheet and reaching the user's hand. Unfortunately, this practice results in a waste of tissue which expends economic resources and degrades the environment.

Therefore, a tissue product having a transfer resistance can reduce the use of the tea leaf by allowing the utilization of the total absorbency capacity of the tissue, thereby reducing the tissue consumption and waste rates.

DEFINITIONS As used herein, the term "repellent agent" refers to an agent that resists the absorption of a liquid desirably an aqueous liquid. The repellent agent can repel liquids by filling interstitial voids in the fibrous structure of a tissue or by coating the individual fibr to prevent liquids from being absorbed and passing through the fibers into the fibrous structure. The repellent agent can be hydrophobic and can include such materials as sizing agents, waxes, lather. In addition, the repellent agent can be any hydrophobic chemical, such as the agent sold under the trademark EACTOPAQUE of Sequa Drive, Chester, South Carolina. 29706. Amount of repellent agent added to the fibers can be from about 1 to about 30 pounds per ton of fiber, more specifically from about 1.2 to about 20 pounds per ton of fiber, and even more specifically from about 2. at around 10 pounds per ton fiber.

As used herein, the term "latex" refers to a colloidal water dispersion of higher polymers from sources related to natural rubber such as Hevea tree sap, or synthetic higher polymers that look like natural hul. Synthetic latexes can be made by emulsion polymerization technique of styrene butadiene copolymer, acrylate resins, polyvinyl acetate and similar materials.

As used herein, the term "layer" refers to a unique thickness, cou stratum, or fold that may lie or remain on or under another. An example of a multi-layer structure is shown in Figure 3 wherein a tis product for toilet 80 includes three layers 84, 86 and 88.

As used herein, the term "stratum" refers to a material produced from a headbox having one or more layers. An example toilet tissue product having a two-layer structure is shown in Figure 1, where a product 10 includes two layers 22 and 26.

As used herein, the term "wax" refers to aqueous emulsions of small particles maintained in their bedding by emulsifying agents and may include materials such as paraffin waxes, microcrystalline wax, or other waxes.

As used herein, the term "sizing agent" refers to any chemical that inhibits the penetration of liquid into the cellulosic fiber structures.The suitable sizing agents are described in the text entitled "Papermaking and Paperboard Manufacturing". ", second edition, Volume III, edited by RG MacDonald and J. N Franklin, which is incorporated by reference.

Sizing agents are commonly added to control the penetration of aqueous liquids into the paper or other fibrous structures. In many cases, a certain resistance is required for the final use. When the surface treatments are applied with conventional equipment, such as sprinklers or applicators, the sizing on the base sheet is often required to control the volume of the aqueous solution. Paper classes such as butcher wrap, milk carton, cardboard liner, bleached and unbleached bag, fine paper, cylindrical cardboard and corrugated media are routinely sized.

The internal sizing agents, which are applied to the fibers within the paper structure, provide a reduced rate of penetration by retarding the rate of flow through the capillary vessels of the paper, as measured by the Test procedure ASTM D 779-94. When sizing is achieved, the contact angle on the fiber surface is 90 degrees or greater, as measured by the ASTM D 5725-95 test procedure or TAPPI Test Method T-458. The internal sizing agents work through the use of hydrophobic chemicals with low surface energy which, when attached to the surface of the cellulose, reduce the surface energy of the fiber surface.

Particularly suitable sizing agents are alkali or acid sizing agents such as rosin, and alkenyl succinic anhydride, the alkyl ketone dimers and the alkenol ketene dimers of the formula: 0 C = 0 wherein Rx and R2 are based on C1S-C18 aliphatic carbon chains, which may be the same or different. Example commercially available sizing agents of this type HERCON 79, HERCON 1332, and PRECIS 3000 from Hercules, Inc., of Wilmington, Delaware. The amount of the sizing agent added to the fibers can be from about 0.5 to about 10 pounds per ton of fiber, more specifically from about 1.0 to about 3 pounds per ton of fiber and even more specifically, from around 2 to around 2.5 pounds per ton of fiber.

As used herein, the term "transfer prevention region" refers to an area in a tissue product treated with a repellent agent. The waste prevention region prevents or stops the penetration of liquid from one side of the tissue product to the other.

As used herein, the term "cellulosic matter" refers to a material that can be prepared from cellulose fibers from natural sources or from synthetic sources such as from woody and non-woody plants. Woody plants include, for example, deciduous and coniferous trees. The non-woody plants include, for example, cotton, flax, grass, esparto vencetósigo, straw, jute, hemp and bagasse. The cellulosic fibers can be modified by various treatments such as, for example, thermal, chemical and / or mechanical treatments. It is contemplated that the synthetic and / or reconstituted cellulosic fibers can be used and / or bent with other cellulosic fibers of the fiber cellulosic material. Desirably, no synthetic fibers are woven into the fibers of cellulosic material.

As used herein, the term "pulp" refers to cellulose fibrous material from sources such as woody and non-woody plants. Woody plants include, for example, deciduous and / or coniferous trees. Woody plants include, for example, cotton, flax, grass, esparticum, straw, jute, hemp and bagasse. The pulp can be modified by various treatments such as, for example, thermal, chemical and / or mechanical treatments. Desirably no synthetic fibers are woven into the pulp fibers.

As used herein, the term "bleached chemical-thermomechanical pulp" refers to a processing of cellulosic matter with steam, pressure and sodium sulfite or hydrogen peroxide to soften the wood lignin between and within the cell walls. In addition, the alkaline peroxide bleach is added to further soften and polish the fibers. The term bleached quimotermomecánica pulp may be hereinafter abbreviated as "BCTMP" and may be more hydrophobic than kraft fiber.

As used herein, the term "sulphite pulp" refers to the pulp chemically processed with a mixture of sulfuric acid and bisulfite ion.These chemicals attack solubilize the lignin in the pulp supply.The sulfite pulp may be more hydrophobic than kraft fiber.

As used herein, the term "basis weight" (hereinafter referred to as "BW") is the weight per unit area of a sample and can be reported as grams per square meter force. The basis weight can be measured using the test procedure ASTM D 3776-96 of the TAPPI Test Method T-220.

SYNTHESIS OF THE INVENTION The problems and needs described above are examined by the present invention, which provides a toilet tissue product which may include a first cellulosic stratum and a second cellulosic stratum. Each stratum can also include a single layer. At least one stratum can have a region that prevents the fluid from passing through the tissue product. In addition, at least one stratum can be treated with a repellent agent to create a region to prevent the transfer of fluid. In addition, at least one stratum can be printed and / or sprayed with a repellent agent. In addition, the repellent agent can be a sizing agent or a hydrophobic chemical. Another embodiment of a toilet tissue product can include a first cellulosic layer that also has a first layer and a second layer and a second cellulosic layer that also has a first layer and a second layer The first layers of the layers can have d essentially sandwich the second layers of the strata, wherein at least one of the second layers can resist the transfer of fluid. In addition, at least one of the second layers may include a repellent agent. In addition, the repellent agent may be a wax, a latex, a hydrophobic chemical and / or a sizing agent. In addition, the repellent agent can be printed on at least one of the second layers. Additionally, the repellent agent can be sprayed on at least one of the second layers. Also, the repellent agent can be mixed with the fibers of at least one of the second layers in a headbox. In addition, at least one of the second layers may include sulfite pulp or bleached quimotermomechanical pulp.

Another embodiment of the present invention is a toilet tissue product not treated with a permanent wet strength binder, which may include a first cellulosic layer also including the first, second and third layers. The first and second layers must have in sandwich form the second layer, which may be resistant to fluid transfer. In addition, the second layer may also include a repellent agent. In addition, the repellent agent may be a wax, a latex and / or a sizing agent. In addition, the repellent agent can be printed on the second layer. Additionally, the repellent agent can be sprayed onto the second layer. Also, the repellent agent can be mixed with the fibers of the second layer in a headbox. In addition, the second layer may include sulfite pulp or a bleached quimotermomechanical pulp.

A further embodiment of the present invention is a toilet tissue product not treated with a permanent wet strength binder, which may include the first, second and third cellulosic strata. The first and third strata may have the sandwich form in the form of a sandwich. second stratum, which can be resistant to fluid transfer. In addition, the second stratum may also include a repellent agent. In addition, the repellent agent can be wax, latex and / or a sizing agent. In addition, the repellent agent can be printed on the second layer. Additionally, the repellent agent can be sprayed on the second layer. Also, the repellent agent can be mixed with the fibers of the second layer in a headbox. In addition, the second stratum may include sulphite pulp or bleached quimotermomechanical pulp.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an enlarged side elevational view, but necessarily to scale of an incorporation of a toilet tissue product having a fluid transfer barrier.

Figure 2 is a side elevational view and amplified, but not necessarily to scale, of another embodiment of a toilet tissue product having a fluid transfer barrier.

Figure 3 is an enlarged side elevational view, but not necessarily to scale of yet ot incorporation of a toilet tissue product having a barrier to fluid transfer.

Figure 4 is an illustration of an exemplary process for making a toilet tissue product.

Figure 5 is an illustration of another example process for making a toilet tissue product.

Figure 6 is an illustration of another exemplary process for making a toilet tissue product.

Figure 7 graphically compares the perception of the subjects of fluid transfer for a control tissue roll and three rolls of tissue of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED INCORPORATION OR INCORPORATION Referring now to the drawings, wherein the reference numbers which designate a corresponding structure through the views, and referring in particular to Figures 1-3, there are three additions of the tissue products for toilet 20, 50 and 80 The tis product for toilet 20 can include a first cellulosic layer 22 a second cellulosic layer 26. The basis weight of tissue product 20 can vary from about 8 grams per square meter force (hereinafter can be abbreviated as "gsm") at about 59 grams force per square meter desirably from about 17 grams force per square meter to about 34 grams force per square meter and more desirably at about 27 grams force per square meter. Each stratum 22 and 26 It can have a basis weight of about grams force per square meter.

Desirably, each stratum 22 and 26 respectively includes a single layer 24 and 28. The layer 24 can be treated with a repellent agent to form a first sweep or fluid transfer prevention region 30. Optionally, the layer 28 can be treated with a repellent agent for forming a second barrier or fluid transfer prevention region 32. Desirably, a sizing agent is sprayed or applied to the layers 28 and 30 to create, respectively, the regions 32. Although the regions of transfer of fluid is shown inside the tissue product 20, it should be understood that one or more transfer regions can instead be located on the outside of the tissue product 20.

In addition, a stratum 22 or 26 can be formed with a repellent agent by creating a handover region as described hereinafter. Strata 22 and 26 can be formed from pulp fiber using any suitable papermaking techniques, and one such exemplary technique will be described hereinafter. The strata 22 and 26 can be joined together using any suitable means, such as the adhesives or the pressure applied by a stratified tie wheel or d. Exemplary joining techniques are described in U.S. Patent Nos. 5,698,291 5,622,734 and 5,543,202 which are incorporated herein by reference. If a knotting wheel is used, desirably only the edges of the strata 22 and 26 are joined together.

The tissue product for toilet 50 may include a first cellulosic layer 52 and a second cellulosic layer 58. The basis weight of the tissue product 50 may vary from about 8 grams per square meter to about 5 grams per square meter desirably from about 17 grams strength to about 34 grams force per square meter and more desirably from about 2 grams force per square meter. Each stratum 54 and 60 can have a basis weight of about 4 grams force per square meter.

Desirably, the stratum 52 includes a first layer 54 and a second layer 56, and the stratum 58 includes a first layer 60 and a second layer 62. The layer 56 may be treated with a repellent agent to prevent the transfer of fluid. The repellent agent, such as the sizing agent can be sprayed or printed onto the layer 56, or alternatively the repellent agent, such as wax, latex or hydrophobic chemical can be incorporated into the layer 56 during the manufacturing process paper. Optionally, layer 62 can be treated with a repellent agent to prevent the transfer of fluid. The repellent agent, such as a sizing agent can be sprayed or printed onto the layer 62, or alternatively, the repellent agent such as a wax or latex, can be incorporated into the layer 62 during the papermaking process. Additionally, a plurality of repellent agents can be used, which can be sprayed and / or incorporated into layers 56 and / or 62.

Layers 54, 56, 60 and 62 can be formed using any suitable papermaking techniques, one such example technique will be described hereinafter. Desirably, the layers 54 and 56 are processed through a headbox to form the stratum 52 and the layers 60 and 62 are processed through a headbox to form the stratum 58. The strata 52 and 58 can be joined together using any suitable means, such as adhesives or the pressure applied by a knotter wheel. Exemplary binding techniques are described in U.S. Pat. Nos. 5,698,291; 5,622,734 5,543,202, which are incorporated herein by reference. If a knotting wheel is used, desirably only the edges of the strata 52 and 58 are joined together.

The tissue product for toilet 80 may include a first cellulosic layer 82. The basis weight of the tissue product 80 may vary from about 8 grams per square meter to about 59 grams per square meter, desirably from about 17 grams force per square meter to about 34 grams force per square meter, and more desirably about 27 grams force per square meter. Desirably, the layer 82 includes a first layer 84, a second layer 86 and a third layer 88. The layer 8 can be treated with a repellent agent to prevent fluid shedding. The repellent agent, such as a distressing agent can be sprayed onto the layer 86, or alternatively, the repellent agent, such as a wax, a latex, or a hydrophobic chemical can be incorporated into the layer 86 during the manufacturing process of paper. Additionally, a plurality of repellent agents can be used which can be sprayed and / or incorporated in layer 86.

Layers 84, 86 and 88 can be formed using any suitable papermaking techniques, and such exemplary techniques will be described hereafter. The layers 84, 86 and 88 can be processed through a head box to form the layer 82. Alternatively, the tissue product for the toilet 80 can be formed from single layer layers corresponding to the layers 84, 86 and 88. The strata can be joined together as previously described to form a product of three strata 80 having a total of three layers.

The tissue products 20, 50 and 80 have regione that provide resistance to the transfer that prevent deceleration of the absorbency of the fluid through the tissue. It should be understood that some pulps, such as sulfite pulp or bleached quimotermomechanical pulp, have transfer resistance properties. Therefore, these pulps can be used as a substitute for a repellent agent or as an auxiliary to decelerate the absorbency. In addition, the toilet tissues 20, 50 and 80 of the present invention, unlike conventional facial tissues, may contain no permanent wet strength bonding materials. The wet bonding binder materials may include polyamide-epichlorohydrin, polyacrylamides, styrene-butadiene latexes, insolubilized polyvinyl alcohol, urea-formaldehyde, polyethyleneimine, chitosan polymers, mixtures thereof. Generally, it is desirable to add permanent tissue wet binder materials to the toilet because these materials prevent tissue resolution at a toilet rate.

Figures 4-6 show example processes for forming, respectively, the tissue products 20, 50 and 80. When the paper forming lines here and there use creping, a paper-forming line does not crep as the former. described in United States Patents Nos. 5,048,589 and 5,399,421, which are incorporated herein by reference, may be used instead.

Figure 4 shows an example process for forming the toilet tissue product 20, which may include a wet supply line 102 and a pap forming line 156. The wet supply line 102 may include a cof 104, a press tow 108 and a fan pump 116.

Desirably, the hood 104 stores an aqueous suspension of papermaking fibers, such as a sulphite pulp or bleached chemo-thermomechanical pulp, which is fed through a stream 106 to the tow press 10 to maintain a constant pressure head. An output stream 112 from the tow press 108 may be sent to the fan pump 116. A discharge 118 from the fan pump 116 may then be sent to the paper forming line 156.

The paper forming line 156 can include a head box 120, a forming fabric 124, a formed roller 126, a press felt 128, a vacuum pressure roller 130, a Yankee dryer 136, an air cover 140, a doctor blade 144, and a core 152. Desirably, the head box 120 receives the discharge 118 from the ventilating pump 116 and further injects continuously or deposits the suspension of fibers for aqueous paper between the forming fabric 124 and the press felt. 128, which is partially wrapped around forming roller 126. The water can be removed from the suspension through the forming fabric 124 by a centrifugal force as it passes through the newly formed fabric of the shape 126 roll. Desirably, the fabric wet and dewatered to a consistency of about 12% by dry weight before the pressure roller with vacuum 130.

After formation of the fabric 124 and separate press felt 128, the wet fabric can be transported to the press felt 128 to the vacuum press roll 130 where it can be pressed against the Yankee dryer 136 drying. An aqueous adhesive mixture can be sprayed evenly and continuously through a spray bar 132 onto the dryer surface of the Yankee dryer 136. The application point on the dryer surface can be between the knife 144 and the vacuum pressure roller. 130. The adhesive blend can aid in the adhesion of fabric to the Yankee dryer 136, and thus can increase crepe operation when the dryer sheet 136 is removed through the blade 144. The creped tissue can be rolled up on the core 152 in the spool section, the run runs at a speed of about 30% slower than the dryer 136. A repellent agent, such as a sizing agent, can be applied to the dry fabric by spraying a aqueous solution through the spray bar 14 located between the blade 144 and the core 152. Alternatively, the repellent agent can be spray coated onto the moving tissue tissue before the pressure roller 130 or after the tissue tissue is transferred to the Yankee dryer 136.

Figure 5 shows an example process 200 for forming a single layer of the toilet tissue product 50, such as the stratum 52. The process 200 may include the wet supply lines 210 and 230, and a paper forming line 256.

The wet supply line 210 may include a hood 214, a tow press 218 and a fan pump 216. The hood 214 may store an aqueous suspension of papermaking fibers, such as sulfite pulp or bleached chemo-thermomechanical pulp, which it can be fed through a stream 216 to the tow presser 218 to maintain a constant pressure head. A stream of outlet 222 from the tow press 218 may be sent to the fan pump 226. A discharge 228 of the fan pump 226 may then be sent to the paper forming line 256.

The wet supply line 230 may include a hood 234, a tow press 238, and a fan pump 246. The hood 214 can store an aqueous suspension of fibers for making paper, which can be fed through a stream 236 to the tow press 238 to maintain a constant pressure head. An amount of repellent agent 240 such as wax, latex, hydrophobic chemical, and / or sizing agent may be added to the tow press 238 to form a pulp layer having fluid transfer prevention properties. An output stream 242 and the tow press 238 may be sent to the fan pump 246. A discharge 248 of the fan pump 246 may then be sent to the paper forming line 256.

Desirably, the paper forming line 256 includes a layered headbox 260, a forming fabric 264, a shape roller 266, a press felt 268, a vacuum pressure roller 270, a Yankee 276 dryer, a cover air 280, a doctor blade 284 and a core 288. The head box 120 can receive the discharges 228 and 248 of the fan pumps 226 and 246, and can continuously inject or deposit the aqueous paper fiber suspensions between the tel former 264 and press felt 268, which can be partially wrapped around the shape roller 266. This deposit can form a two-layer solution on the former 264. The water can be removed from the suspension through the forming fabric 264 by centrifugal force to traverse the newly formed tissue the arc of the d shape roller 266. The wet fabric can be dewatered to a consistency of about 12% by dry weight before the pressure roller with vacuum 270 After the forming fabric 264 is separated from the press felt 268, the wet fabric can be transported over the press felt 268 to the vacuum pressure roll 270 where it can be thought against the Yankee dryer 276 for drying . Generally, high temperatures can help in the curing of the repellent agent.

Desirably, an aqueous adhesive mixture is sprayed evenly and continuously through a spray bar 272 onto the dryer surface of the Yanke dryer 276. The application point on the surface of the dryer can be between the knife 284 and the roller. vacuum pressure 270. The adhesive blend can aid in fabric adhesion to the Yankee 276 dryer, and therefore, can increase creping operation when the dryer sheet 276 is removed through the knife 284. Desirably, the creped tis is wound on the core 288 in the carret section which runs at a speed of about 30% slower than that of the dryer 276. The wound tissue may be in the form of a single stratum having two layers , such as stratum 52 Optionally, a repellent agent, such as a sizing agent, can be sprayed or coated between the blade 284 and the core 288, on the tissue of movement before the pressure roller 270 and / or after the tissue of the tissue. be transferred to the Yankee 276 dryer.

A second stratum, such as stratum 58, can be made in a similar manner as shown in Figure 5. The tissue product 50 can be created by the tie layers of layer 52 and 58, using any suitable means such as adhesives. , or pressure, with the layer 58 being oriented in an identical relationship with the layer 52, thus having in sandwich form the second layers 56 and 62 with the first layers 54 and 60 and forming a palindromic structure.

Figure 6 shows an exemplary process 300 for forming a single stratum of the toilet tissue product 80, ta as the stratum 82. The process 300 may include the wet supply lines 310, 330 and 350, and the paper forming line 306. .

The wet supply line 310 may include a hood 314, a tow press 318 and a fan pump 328. Desirably, the hood 314 stores an aqueous suspension of papermaking fibers, which is fed through a stream 316 to the stuffer press 318 to maintain a constant pressure head. A discharge stream 322 from the tow press 318 may be sent to the fan pump 326. A discharge 328 from the fan pump 326 may then be sent to the paper forming line 306.

The wet supply line 330 may include a hood 334, a tow press 338, and a fan pump 346. Desirably, the hood 314 stores an aqueous suspension of papermaking fibers, such as sulfite pulp or quimotermomechanical pulp. bleached, which is supplied through a stream 336 to the tamp presser 338 to maintain a constant pressure head. A quantity of repellent agent 340, such as wax, latex, hydrophobic chemical and / or sizing agent, the tow press 338 may be added to form a pulp layer which has fluid transfer prevention properties. An output stream 342 from the tow press 338 may be sent to the fan pump 346. Desirably, discharge 348 from the fan pump 346 is then sent to the paper forming line 306.

The wet supply line 350 may include hood 354, a tow press 358, and a fan pump 368. The hood 354 may store an aqueous suspension of paper fibers, which is fed through a stream 356 to the press of tows 358 to maintain a constant pressure head. An output stream 362 the tow press 358 can be sent to the fan pump 366. The discharge 368 from the fan pump 36 can be sent to the paper forming line 306. The paper forming line 306 can include a paper box. layer head 370, a forming fabric 374, a shape roller 376, a press felt 378, a vacuum pressure roller 380, a Yankee dryer 386, an air cover 390, a doctor blade 394, and a core 398. Desirably, the head box 37 receives the discharges 328, 348, and 368 of the ventilating pumps 326, 346, and 366 and continually injects or deposits the aqueous paper fiber suspensions between the forming fabric 374 and the press felt. 378, which is partially wrapped around the forming roller 376. This deposit can form a three-layered solution on the forming fabric 374. The agu can be removed from the suspension through the forming fabric 374 by means of centrifugal force on traversing the newly formed fabric the arc of the forming roll 376 Desirably, the wet fabric is dewatered at a consistency of about 12% by dry weight before the pressure roll with 380 vacuum.

After the forming fabric 376 and the press felt 378 are desirably separated, the wet fabric is transported over the press felt 378 to the vacuum pressure roll 380 where it is pressed against the Yankee 386 dryer. for drying. Generally, high temperatures help in the curing of the repellent agent.

An aqueous adhesive mixture can be sprayed evenly and continuously through a spray barrier. 382 on the surface of the dryer of the Yankee 386 dryer.

The point of application on the surface of the dryer can be between the blade 294 and the pressure roller with vacuum 380. Desirably the adhesive mixture aids in the adhesion of the fabric to the Yankee 386 dryer, and therefore increases crepe operation when removing the sheet from the dryer. 386 through the blade 394. The creped tissue can be attached on the core 398 in the reel section, which can run at a rate of about 30% or slower than that of the dryer 386. The wound tissues can be in the form of a single stratum that has three layers, such as stratum 82.

PROOF A test that measures the transfer resistance f carried out by comparing a roll of tissue with three rolls produced by the present invention. The women subjects were asked to compare the resistance transfer of four rolls after urinating.

All rolls were formed from a refined recycled fiber supply. Each roll contained two strata Each stratum had a basis weight of about 14 grams per square meter (gsm). The rolls of the present invention were treated with 0.12 percent by weight per stratum of a ready-made agent named HERCON 79.

The first roll was the control one. The second roll was printed or coated with the sizing agent. The third roll was sprayed with the sizing agent after the forming box and before the tissue transfer. The cuart roll was formed with the sizing agent dosed in d the top layer. Each stratum had a top layer with a size and a base prisoner of around 5 grams per square meter and a lower layer without sizing and a base weight of about 8 grams per square meter.

The test procedure involved 53 subjects. Each subject randomly evaluated each tissue product. The subjects were instructed to pull four sheets of complete bath tissue out of a test roll and to use the tissue according to their normal practice. Afterwards, the subjects evaluated the capacity of the fluid for the transfer of the tissue sheet. The results are shown in figure 7.

As it was shown, rolls 2, 3 and 4 of the present invention were more likely to be perceived as having a transfer than the control roll, roll 1. About 5% of the subjects did not perceive a transfer of fluid for rolls 2, 3 and 4, while only about 3 percent of the subjects did not perceive a handover for roll 1. As a result, the rolls of the present invention were perceived as more likely to avoid fluid transfer than the control roll.

Although the present invention has been described in relation to certain preferred embodiments, it should be understood that the subject matter encompassed by the present invention should not be limited to those specific embodiments. On the contrary, it is intended that the subject matter of the invention include all alternatives, equivalent modifications as may be included within the spirit and scope of the appended claims.

Claims (37)

R E I V I N D I C A C I O N S
1. A tissue product for toilet q comprises: a first cellulosic layer also comprising a single layer; a second cellulosic layer also comprising a single layer; Y at least one stratum having a region which prevents fluid from passing through the tissue product.
2. 2. The toilet tissue product as claimed in clause 1, characterized in that at least one stratum is treated with a repellent agent to create a region to prevent the transfer of fluid.
3. 3. The toilet tissue product as claimed in clause 2, characterized in that at least one stratum is printed with a repellent agent.
4. 4. The toilet tissue product as claimed in clause 2, characterized in that at least one stratum is sprayed with a repellent agent.
5. 5. The toilet tissue product as claimed in clause 2, characterized in that the repellent agent is a sizing agent.
6. 6. The toilet tissue product as claimed in clause 2, characterized in that the repellent agent is a hydrophobic chemical.
7. A tissue product for the toilet, which comprises: a first cellulosic layer comprising, in addition, a first layer and a second layer; Y a second cellulosic layer also comprising a first layer and a second layer wherein the first layers of the layers essentially sandwich the second layers of the layers, wherein at least one of the second layers is resistant to the transfer of the second layer. fluid.
8. 8. The tissue product for the toilet is claimed in clause 7, characterized in that at least one of the second layers comprises a repellent agent.
9. 9. The tissue product for the toilet is as claimed in clause 8, characterized in that the repellent agent is wax.
10. 10. The tissue product for the toilet such and com is claimed in clause 8, characterized in that the repellent agent is latex.
11. 11. The tissue toilet product is claimed in clause 8, characterized in that the repellent agent is a sizing agent.
12. 12. The tissue toilet product is claimed in clause 8, characterized in that the agent d is a hydrophobic chemical.
13. 13. The tissue product for the toilet such and com is claimed in clause 8, characterized in that the repellent agent is printed on at least one of the second layers.
14. 14. The tissue product for the toilet as claimed in clause 8, characterized in that the repellent agent is sprayed on at least one of the second layers.
15. 15. The tissue product for the toilet such and co is claimed in clause 8, characterized in that the repellent agent is mixed with the fibers of at least one of the second layers in a headbox.
16. 16. The tissue product for the toilet such and co is claimed in clause 7, characterized in that at least one of the second layers comprises sulphite pulp.
17. 17. The tissue product for the toilet is claimed in clause 7, characterized in that at least one of the second layers comprises a bleached quimotermomecánic pulp.
18. 18. A tissue product for the toilet is not treated with a permanent wet strength binder, which comprises: a first cellulosic layer further comprising the first, second and third layers wherein the first and third layers have the second layer in sandwich form which is resistant to the transfer of the fluid.
19. 19. The tissue toilet product is claimed in clause 18, characterized in that the second layer comprises a repellent agent.
20. 20. The tissue product for the toilet such and co is claimed in clause 19, characterized in that the repellent agent is wax.
21. 21. The tissue product for the toilet such and co is claimed in clause 19, characterized in that the repellent agent is latex.
22. 22. The tissue product for the toilet such and co is claimed in clause 19, characterized in that the repellent agent is a sizing agent.
23. 23. The tissue product for such and such a toilet is claimed in clause 19, characterized in that the repellent agent is printed on the second layer.
24. 24. The tissue product for the commode toilet is claimed in clause 19, characterized in that the repellent agent is sprayed on the second layer.
25. 25. The tissue toilet product is claimed in clause 19, characterized in that the repellent agent is mixed with the short fibers of the second layer in a head box.
26. 26. The tissue toilet product is claimed in clause 18, characterized in that the second layer comprises sulphite pulp.
27. 27. The tissue product for the toilet such and com is claimed in clause 18, characterized in that the second layer comprises bleached quimotermomecánica pulp.
28. 28. A tissue product for the toilet is not treated with a permanent wet strength binder which comprises: a first cellulose layer; a second cellulosic stratum; Y a third cellulosic stratum in which the first and third layers have the second stratum in the form of a sandwich, which is resistant to the transfer of fluid.
29. 29. The tissue toilet product is claimed in clause 28, characterized in that the second stratum comprises a repellent agent.
30. 30. The tissue product for the toilet such and co is claimed in clause 29, characterized in that the repellent agent is wax.
31. 31. The tissue product for the toilet such and co is claimed in clause 29, characterized in that the repellent agent is latex.
32. 32. The tissue product for the toilet is claimed in clause 29, characterized in that the repellent agent is a sizing agent.
33. 33. The tissue toilet product is claimed in clause 29, characterized in that the repellent agent is printed on the second layer.
34. 34. The tissue product for the toilet is claimed in clause 29, characterized in that the repellent agent is sprayed on the second layer.
35. 35. The tissue product for the toilet is claimed in clause 29, characterized in that the repellent agent is mixed with the short fibers of the second layer in a headbox.
36. 36. The tissue toilet product is claimed in clause 28, characterized in that the second stratum comprises sulphite pulp.
37. 37. The tissue toilet product is claimed in clause 28, characterized in that the second stratum comprises bleached chemo-thermomechanical pulp. SUMMARY A toilet tissue product that may include a first cellulosic layer and a second cellulosic layer Desirably, the first cellulosic layer also includes a single layer and the second cellulosic layer further includes a second layer. At least one stratum can have a region q which prevents fluid from passing through the tissue product.