CA2239927A1 - Method of applying chemical sizing agents for making reduced wet-through tissue - Google Patents
Method of applying chemical sizing agents for making reduced wet-through tissue Download PDFInfo
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- CA2239927A1 CA2239927A1 CA 2239927 CA2239927A CA2239927A1 CA 2239927 A1 CA2239927 A1 CA 2239927A1 CA 2239927 CA2239927 CA 2239927 CA 2239927 A CA2239927 A CA 2239927A CA 2239927 A1 CA2239927 A1 CA 2239927A1
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Abstract
Soft creped tissue that reduces fluid penetration can be produced by the indirect addition of chemical sizing agents to the tissue web by applying the chemical sizing agents to the surface of the Yankee dryer, such as by spraying. More specifically, the sizing agents can be included as part of the creping adhesive formulation, which is sprayed onto the surface of the Yankee dryer between the creping blade and the pressure roll. The sizing agents are subsequently transferred to the tissue sheet surface as the sheet is pressed against the Yankee dryer. The benefit of reduced fluid penetration is that hands remain drier during use.
Description
PATENT
METHOD OF APPLYING
CHEMICAL SIZING AGENTS FOR MAKING REDUCED WET-THROUGH TISSUE
Background of the Invention The use of sizing agents in the manufacture of tissues, such as facial and bath tissue, is not common practice in the industry. However, it has been demonstrated that the addition of sizing agents similar to those commonly used in fine papers reduces the ability of fluid to penetrate the tissue and thereby keep the users hands dry during most 5 uses. Such tissues also have adequate absorbency to be functionally useful. These tissues typically contain a blend of relatively long fibers, which are usually softwood fibers, and relatively short fibers, which are usually hardwood fibers. Preferably, the sizing agent is added to the long fibers prior to forming the web since better chemical retention is achieved than with addition to short fibers. The long fibers are also treated with 10 strengthening agents (wet and dry) and refining. Both refining and strengthening agents are often used because excessive use of either treatment may have an adverse effect on the tissue making process and/or the resulting tissue product.
However, addition of sizing agents to the fiber furnish can have some disadvantages. In one case, sizing agents added to a furnish prior to forming cause 15 internal debonding which results in loss of tensile strength and increased dust when the sheet contacts the creping doctor blade. The loss in tensile strength may require excessive refining or strength additive which can have a detrimental effect on tissue softness. Excessive dust may increase the frequency of sheet breaks at the reel, provide a less than desirable environment for machine operators and is detrimental to the 20 consumer perception of the tissue.
Therefore there is a need for a more effficient method of utilizing sizing agents in the manufacture of tissues.
Summary of the Invention It has now been discovered that soft creped tissue can be produced by the indirect addition of chemical sizing agents to the tissue web by applying the chemical sizing agents to the surface of the Yankee dryer, such as by spraying. More specifically, the 5 sizing agents can be included as part of the creping adhesive formulation, which is sprayed onto the surface of the Yankee dryer between the creping blade and the pressure roll. The sizing agents are subsequently transferred to the tissue sheet surface as the sheet is pressed against the Yankee dryer.
The sizing agent remains predominantly on the surface of the sheet where it is 10 most beneficial, thereby resulting in a barrier to rapid absorption of fluid. Some of the sizing agent passes through the sheet while in the pressure roll nip and is recirculated back to the wet end of the tissue machine with the white water. As such, additional amounts become incorporated into the tissue sheet at that point of the process, but these amounts are more evenly distributed throughout the sheet. The net result is a tissue 15 sheet having a greater concentration of sizing agent on the surface of the sheet, thereby reducing rapid absorption of fluid into the sheet relative to sheets made in a conventional manner.
Hence in one aspect the invention resides in a method for making creped tissue comprising: (a) forming a wet tissue web by depositing an aqueous papermaking furnish onto a forming fabric; (b) partially dewatering the tissue web; (c) applying a creping adhesive and one or more sizing agents to the surface of a Yankee dryer; (d) adhering the - tissue web to the surface of the Yankee dryer such that the sizing agent is transferred to the tissue web; and (e) creping the web.
In another aspect, the invention resides in a tissue product made by the above-mentioned method.
As used herein, a Usizing agent" is any chemical that imparts water repellency to cellulosic fibers. Suitable sizing agents are disclosed in a text entitled UPapermaking and 20 Paper Board Making," second edition, Volume lll, edited by R. G. MacDonald, and J. N.
Franklin .
Sizing agents are commonly added to control the penetration of aqueous liquids into paper or other fibrous structures. In many cases, a certain resistance is required for end use. When surface treatments are applied with conventional equipment often sizing 25 is required in the base sheet to control pickup of the aqueous solution. Paper grades such as butcher's wrap, milk cart3n, linQrb3ard, bleached and unbleached bag, fine paper, cylinder board, newsprint and corrugated medium are routinely sized.
Internal sizing agents, which are those applied to the fibers within the paper structure, provide a reduced rate of penetration by retarding the rate of flow through the inter-fiber .
capillaries. When sizing is accomplished, the contact angle at the fiber surface is 90 degrees or greater. Internal sizing agents function through the use of low surface energy, hydrophobic chemicals which when attached to the surface of cellulose reduce the surface energy of the fiber surface.
Particularly suitable sizing agents are acid or alkaline sized such as acid rosin, alkenyl ketene dimers, alkenyl succinic anhydride, alkyl ketone dimers and alkenol ketene dimers of the formula:
R, - CH = C - CH - R2 O-C=O
wherein R, and R2 are based on C16 - C,8, aliphatic carbon chains, which can be the same or different. Exemplary commercially available sizing agents of this type are Hercon 15 79 and Precis 3000 from Hercules, Inc., Wilmington, Delaware. The amount of the sizing agent to the fibers can be from 1 to about 10 pounds per ton of fiber, more specifically from about 1.5 to about 3 pounds per ton of fiber, and still more specifically, from about 2 to about 2.5 pounds per ton of fiber.
As used herein, the "Absorbency Rate" is a measure of the water repellency 20 imparted to the tissue by the sizing agent. The Absorbency Rate is the time it takes for a product to be thoroughly saturated in distilled water. To measure the Absorbency Rate, samples are prepared as 2 1/2 inch squares composed of 20 finished product sheets using a die press (e.g. TMI DGD from Testing Machines Incorporated Inc., Amityville, N. Y.
11701). The ply of a finished product dictates the number of individual sheets: 1-ply: 20 25 individual sheets; 2-ply: 40 individual sheets; 3-ply: 60 individual sheets. When testing soft rolls (single ply of tissue coming off the tissue machine before plying at the rewinder), 40 individual softroll sheets are used per sample (if the intended finished product is 2-ply.) The samples are stapled in all four corners using Swingline S.F 4 inch speedpoint staples. Samples are tested in a constant temperature water bath at a depth of at least 4 30 inches (maintained though out testing) containing distilled water at 30 +/- 1~ Celsius. The sample is held approximately one inch above the water surface (staple points in the down position) and then dropped flat on the water surface. A stopwatch (readable to 0.1 seconds) is started when the sample hits the water. When the sample is completely saturated the stop watch is stopped and the Absorbency Rate is recorded. A minimum of 35 five samples are tested and the test results are averaged. All tests are conducted in a laboratory atmosphere of 23 +/- 1~ Celsius and 50 +/- 2% RH. All samples are stored ~ CA 02239927 1998-06-30 under these conditions for at least 4 hours before testing. (Sizing agents distribute themselves and react faster at higher temperatures.) The tissues of this invention have an Absorbency Rate, for tissue naturally aged5 days, of about 10 seconds or greater, more specifically about 100 seconds or greater, still more specifically about 200 seconds or greater, still more specifically about 300 seconds or greater, and still more specifically from about 100 to about 400 seconds.
Brief DescriPtion of the Drawing Figure 1 is a schematic flow diagram of a wet-pressed tissue making process, illustrating the addition of sizing agents to the surface of the Yankee dryer. Also shown is the white water recycle flow.
Detailed DescriPtion of the Drawing Figure 1 is a schematic flow diagram of a conventional wet-pressed tissue makingprocess useful in the practice of this invention, although other tissue making processes can also benefit from the stock prep method of this invention, such as throughdrying or other non-compressive tissue making processes. The specific formation mode illustrated in Figure 1 is commonly referred to as a crescent former, although many other formers well known in the papermaking art can also be used. Shown is a headbox 21, a forming fabric 22, a forming roll 23, a paper making felt 24, a press roll 25, a spray boom 26, Yankee dryer 27, and a creping blade 28. Also shown, but not numbered, are various idler or tension rolls used for defining the fabric runs in the schematic diagram, which may differ in practice. As shown, the headbox 21 continuously deposits a stock jet 30 between the forming fabric 22 and felt 24, which is partially wrapped around the forming roll 23.
Water is removed from the aqueous stock suspension through the forming fabric bycentrifugal force as the newly-formed web traverses the arc of the forming roll. As the forming fabric and felt separate, the wet web 31 stays with the felt and is transported to - the Yankee dryer 27.
At the Yankee dryer, the creping chemicals are continuously applied in the form of an aqueous solution to the surface of the Yankee dryer on top of the residual adhesive remaining after creping. In accordance with this invention, the creping chemicals can include one or more sizing agents. The solution is applied by any conventional means, preferably using a spray boom 26 which evenly sprays the surface of the dryer with the creping adhesive solution. The point of application on the surface of the dryer is immediately following the creping doctor blade 28, permitting suffficient time for the spreading and drying of the film of fresh adhesive before contacting the web in the press roll nip.
The wet web 31 is applied to the surface of the dryer by means of the press roll 25 with an application force typically of about 200 pounds per square inch (psi). The incoming web is nominally at about 10% consistency (range from about 8 to about 20%) at the time it reaches the press roll. Following the pressing and dewatering step, the 5 consistency of the web is at or above about 40%. Sufficient Yankee dryer steam power and hood drying capability are applied to this web to reach a final moisture content of about 2.5% or less.
Also illustrated in Figure 1 is the white water recycle system. At the press roll nip, white water effluent 35 expressed from the wet web is collected in catch pan 36. The collected white water 37 drains into wire pit 38. Thick stock 40 having a consistency of about 3 percent is diluted with white water at the fan pump 39 to a consistency of about 0.1 percent. The diluted stock 41 is subsequently injected into the headbox 21 to form the wet web.
Examples Example 1. (Control) A soft tissue product was made using the overall process of Figure 1. More specifically, a papermaking furnish was prepared consisting of 35% northern softwood 20 kraft (NSWK), 15% High Maple Quinnesec and 50% Eucalyptus fibers. The Quinnesec and eucalyptus pulps were beaten together at about 3.5% consistency. The NSWK was beaten separately at about 3.5% consistency. The two pulp streams were blended together before dilution.
The blended furnish was then further diluted to about 0.1 weight percent based on 25 dry fiber, fed to a headbox and deposited from the headbox onto a multi-layer polyester forming fabric to form the tissue web. The web was then transferred from the forming fabric to a conventional wet-pressed carrier felt. The water content of the sheet on the felt just prior to transfer to the Yankee dryer was about 88 percent. The sheet was transferred to the Yankee dryer with a vacuum pressure roll. Nip pressure was about 230 30 pounds per square inch. Sheet moisture after the pressure roll was about 42 percent.
The adhesive mixture sprayed onto the Yankee surface just before the pressure roll consisted of 28 percent polyvinyl alcohol, 58 percent polyamide resin (KymeneLX) and 14 percent release agent (Quaker 2008) . The spray application rate was about 4.2 pounds of dry chemical per metric ts),n 3f fiber. A natural gas heated hood partially enclosing the 35 Yankee had a supply air temperature of 626 degrees Fahrenheit to assist in drying. Sheet moisture after the creping blade was about 2 0 percent. Machine speed was about 4100 feet per minute. The crepe ratio was 1.30, or 30 percent. The resulting tissue was plied *denotes trademark . CA 02239927 1998-06-30 together and calendered with two steel rolls at about 70 pounds per lineal inch. The two-ply product had the dryer side plied to the outside. When converted, the finished basis weight of the two-ply facial tissue at TAPPI standard temperature and humidity was about 17 pounds per 2880 square feet.
Examl~le 2. (Invention) A soft tissue product with reduced moisture penetration can be made in accordance with this invention using the overall process of Figure 1. More specifically, a papermaking furnish is prepared consisting of 35% northern softwood kraft (NSWK), 15%
High Maple Quinnesec and 50% Eucalyptus fibers. The Quinnesec and eucalyptus pulps are beaten together at about 3.5% consistency. The NSWK is beaten separately at about 3.5% consistency. The two pulp streams are blended together before dilution.
The blended furnish can be further diluted to about 0.1 weight percent based on dry fiber, fed to a headbox and deposited from the headbox onto a multi-layer polyester forming fabric to form the tissue web. The web is then transferred from the forming fabric to a conventional wet-pressed carrier felt. The water content of the sheet on the felt just prior to transfer to the Yankee dryer can be about 88 percent. The sheet is transferred to the Yankee dryer with a vacuum pressure roll. Nip pressure can be about 230 pounds per square inch. Sheet moisture after the pressure roll can be about 42 percent. Theadhesive mixture sprayed onto the Yankee surface just before the pressure roll can consist of about 20 percent polyvinyl alcohol, 35 percent polyamide resin (KymeneLX) and 45 percent sizing agent (PTD-M-1332 or PTD-M-1331 available from Hercules Inc.). The spray application rate can be about 8 pounds of dry chemical per metric ton of fiber. A
natural gas heated hood partially enclosing the Yankee can have a supply air temperature of 626 degrees Fahrenheit to assist in drying. Sheet moisture after the creping blade can be about 2.0 percent. Machine speed can be about 4100 feet per minute. The creperatio can be about 1.27, or 27 percent. The resulting tissue is plied together and calendered with two steel rolls at about 70 pounds per lineal inch. The two-ply product can be plied with the dryer side to the outside. When converted, the finished basis weight of the two-ply facial tissue at TAPPI standard temperature and humidity can be about 17 pounds per 2880 square feet. The resulting facial tissue can resist the penetration of moisture thus providing the benefit of keeping the user's hands dry during normal use.
This tissue can have an Absorbency Rate of from 10 to 400 seconds compared to 3 seconds for the control (Example 1).
It will be appreciated that the foregoing examples, given for purposes of illustration, are not to be considered as limiting the scope of this invention, which is defined by the following claims and all equivalents thereto.
METHOD OF APPLYING
CHEMICAL SIZING AGENTS FOR MAKING REDUCED WET-THROUGH TISSUE
Background of the Invention The use of sizing agents in the manufacture of tissues, such as facial and bath tissue, is not common practice in the industry. However, it has been demonstrated that the addition of sizing agents similar to those commonly used in fine papers reduces the ability of fluid to penetrate the tissue and thereby keep the users hands dry during most 5 uses. Such tissues also have adequate absorbency to be functionally useful. These tissues typically contain a blend of relatively long fibers, which are usually softwood fibers, and relatively short fibers, which are usually hardwood fibers. Preferably, the sizing agent is added to the long fibers prior to forming the web since better chemical retention is achieved than with addition to short fibers. The long fibers are also treated with 10 strengthening agents (wet and dry) and refining. Both refining and strengthening agents are often used because excessive use of either treatment may have an adverse effect on the tissue making process and/or the resulting tissue product.
However, addition of sizing agents to the fiber furnish can have some disadvantages. In one case, sizing agents added to a furnish prior to forming cause 15 internal debonding which results in loss of tensile strength and increased dust when the sheet contacts the creping doctor blade. The loss in tensile strength may require excessive refining or strength additive which can have a detrimental effect on tissue softness. Excessive dust may increase the frequency of sheet breaks at the reel, provide a less than desirable environment for machine operators and is detrimental to the 20 consumer perception of the tissue.
Therefore there is a need for a more effficient method of utilizing sizing agents in the manufacture of tissues.
Summary of the Invention It has now been discovered that soft creped tissue can be produced by the indirect addition of chemical sizing agents to the tissue web by applying the chemical sizing agents to the surface of the Yankee dryer, such as by spraying. More specifically, the 5 sizing agents can be included as part of the creping adhesive formulation, which is sprayed onto the surface of the Yankee dryer between the creping blade and the pressure roll. The sizing agents are subsequently transferred to the tissue sheet surface as the sheet is pressed against the Yankee dryer.
The sizing agent remains predominantly on the surface of the sheet where it is 10 most beneficial, thereby resulting in a barrier to rapid absorption of fluid. Some of the sizing agent passes through the sheet while in the pressure roll nip and is recirculated back to the wet end of the tissue machine with the white water. As such, additional amounts become incorporated into the tissue sheet at that point of the process, but these amounts are more evenly distributed throughout the sheet. The net result is a tissue 15 sheet having a greater concentration of sizing agent on the surface of the sheet, thereby reducing rapid absorption of fluid into the sheet relative to sheets made in a conventional manner.
Hence in one aspect the invention resides in a method for making creped tissue comprising: (a) forming a wet tissue web by depositing an aqueous papermaking furnish onto a forming fabric; (b) partially dewatering the tissue web; (c) applying a creping adhesive and one or more sizing agents to the surface of a Yankee dryer; (d) adhering the - tissue web to the surface of the Yankee dryer such that the sizing agent is transferred to the tissue web; and (e) creping the web.
In another aspect, the invention resides in a tissue product made by the above-mentioned method.
As used herein, a Usizing agent" is any chemical that imparts water repellency to cellulosic fibers. Suitable sizing agents are disclosed in a text entitled UPapermaking and 20 Paper Board Making," second edition, Volume lll, edited by R. G. MacDonald, and J. N.
Franklin .
Sizing agents are commonly added to control the penetration of aqueous liquids into paper or other fibrous structures. In many cases, a certain resistance is required for end use. When surface treatments are applied with conventional equipment often sizing 25 is required in the base sheet to control pickup of the aqueous solution. Paper grades such as butcher's wrap, milk cart3n, linQrb3ard, bleached and unbleached bag, fine paper, cylinder board, newsprint and corrugated medium are routinely sized.
Internal sizing agents, which are those applied to the fibers within the paper structure, provide a reduced rate of penetration by retarding the rate of flow through the inter-fiber .
capillaries. When sizing is accomplished, the contact angle at the fiber surface is 90 degrees or greater. Internal sizing agents function through the use of low surface energy, hydrophobic chemicals which when attached to the surface of cellulose reduce the surface energy of the fiber surface.
Particularly suitable sizing agents are acid or alkaline sized such as acid rosin, alkenyl ketene dimers, alkenyl succinic anhydride, alkyl ketone dimers and alkenol ketene dimers of the formula:
R, - CH = C - CH - R2 O-C=O
wherein R, and R2 are based on C16 - C,8, aliphatic carbon chains, which can be the same or different. Exemplary commercially available sizing agents of this type are Hercon 15 79 and Precis 3000 from Hercules, Inc., Wilmington, Delaware. The amount of the sizing agent to the fibers can be from 1 to about 10 pounds per ton of fiber, more specifically from about 1.5 to about 3 pounds per ton of fiber, and still more specifically, from about 2 to about 2.5 pounds per ton of fiber.
As used herein, the "Absorbency Rate" is a measure of the water repellency 20 imparted to the tissue by the sizing agent. The Absorbency Rate is the time it takes for a product to be thoroughly saturated in distilled water. To measure the Absorbency Rate, samples are prepared as 2 1/2 inch squares composed of 20 finished product sheets using a die press (e.g. TMI DGD from Testing Machines Incorporated Inc., Amityville, N. Y.
11701). The ply of a finished product dictates the number of individual sheets: 1-ply: 20 25 individual sheets; 2-ply: 40 individual sheets; 3-ply: 60 individual sheets. When testing soft rolls (single ply of tissue coming off the tissue machine before plying at the rewinder), 40 individual softroll sheets are used per sample (if the intended finished product is 2-ply.) The samples are stapled in all four corners using Swingline S.F 4 inch speedpoint staples. Samples are tested in a constant temperature water bath at a depth of at least 4 30 inches (maintained though out testing) containing distilled water at 30 +/- 1~ Celsius. The sample is held approximately one inch above the water surface (staple points in the down position) and then dropped flat on the water surface. A stopwatch (readable to 0.1 seconds) is started when the sample hits the water. When the sample is completely saturated the stop watch is stopped and the Absorbency Rate is recorded. A minimum of 35 five samples are tested and the test results are averaged. All tests are conducted in a laboratory atmosphere of 23 +/- 1~ Celsius and 50 +/- 2% RH. All samples are stored ~ CA 02239927 1998-06-30 under these conditions for at least 4 hours before testing. (Sizing agents distribute themselves and react faster at higher temperatures.) The tissues of this invention have an Absorbency Rate, for tissue naturally aged5 days, of about 10 seconds or greater, more specifically about 100 seconds or greater, still more specifically about 200 seconds or greater, still more specifically about 300 seconds or greater, and still more specifically from about 100 to about 400 seconds.
Brief DescriPtion of the Drawing Figure 1 is a schematic flow diagram of a wet-pressed tissue making process, illustrating the addition of sizing agents to the surface of the Yankee dryer. Also shown is the white water recycle flow.
Detailed DescriPtion of the Drawing Figure 1 is a schematic flow diagram of a conventional wet-pressed tissue makingprocess useful in the practice of this invention, although other tissue making processes can also benefit from the stock prep method of this invention, such as throughdrying or other non-compressive tissue making processes. The specific formation mode illustrated in Figure 1 is commonly referred to as a crescent former, although many other formers well known in the papermaking art can also be used. Shown is a headbox 21, a forming fabric 22, a forming roll 23, a paper making felt 24, a press roll 25, a spray boom 26, Yankee dryer 27, and a creping blade 28. Also shown, but not numbered, are various idler or tension rolls used for defining the fabric runs in the schematic diagram, which may differ in practice. As shown, the headbox 21 continuously deposits a stock jet 30 between the forming fabric 22 and felt 24, which is partially wrapped around the forming roll 23.
Water is removed from the aqueous stock suspension through the forming fabric bycentrifugal force as the newly-formed web traverses the arc of the forming roll. As the forming fabric and felt separate, the wet web 31 stays with the felt and is transported to - the Yankee dryer 27.
At the Yankee dryer, the creping chemicals are continuously applied in the form of an aqueous solution to the surface of the Yankee dryer on top of the residual adhesive remaining after creping. In accordance with this invention, the creping chemicals can include one or more sizing agents. The solution is applied by any conventional means, preferably using a spray boom 26 which evenly sprays the surface of the dryer with the creping adhesive solution. The point of application on the surface of the dryer is immediately following the creping doctor blade 28, permitting suffficient time for the spreading and drying of the film of fresh adhesive before contacting the web in the press roll nip.
The wet web 31 is applied to the surface of the dryer by means of the press roll 25 with an application force typically of about 200 pounds per square inch (psi). The incoming web is nominally at about 10% consistency (range from about 8 to about 20%) at the time it reaches the press roll. Following the pressing and dewatering step, the 5 consistency of the web is at or above about 40%. Sufficient Yankee dryer steam power and hood drying capability are applied to this web to reach a final moisture content of about 2.5% or less.
Also illustrated in Figure 1 is the white water recycle system. At the press roll nip, white water effluent 35 expressed from the wet web is collected in catch pan 36. The collected white water 37 drains into wire pit 38. Thick stock 40 having a consistency of about 3 percent is diluted with white water at the fan pump 39 to a consistency of about 0.1 percent. The diluted stock 41 is subsequently injected into the headbox 21 to form the wet web.
Examples Example 1. (Control) A soft tissue product was made using the overall process of Figure 1. More specifically, a papermaking furnish was prepared consisting of 35% northern softwood 20 kraft (NSWK), 15% High Maple Quinnesec and 50% Eucalyptus fibers. The Quinnesec and eucalyptus pulps were beaten together at about 3.5% consistency. The NSWK was beaten separately at about 3.5% consistency. The two pulp streams were blended together before dilution.
The blended furnish was then further diluted to about 0.1 weight percent based on 25 dry fiber, fed to a headbox and deposited from the headbox onto a multi-layer polyester forming fabric to form the tissue web. The web was then transferred from the forming fabric to a conventional wet-pressed carrier felt. The water content of the sheet on the felt just prior to transfer to the Yankee dryer was about 88 percent. The sheet was transferred to the Yankee dryer with a vacuum pressure roll. Nip pressure was about 230 30 pounds per square inch. Sheet moisture after the pressure roll was about 42 percent.
The adhesive mixture sprayed onto the Yankee surface just before the pressure roll consisted of 28 percent polyvinyl alcohol, 58 percent polyamide resin (KymeneLX) and 14 percent release agent (Quaker 2008) . The spray application rate was about 4.2 pounds of dry chemical per metric ts),n 3f fiber. A natural gas heated hood partially enclosing the 35 Yankee had a supply air temperature of 626 degrees Fahrenheit to assist in drying. Sheet moisture after the creping blade was about 2 0 percent. Machine speed was about 4100 feet per minute. The crepe ratio was 1.30, or 30 percent. The resulting tissue was plied *denotes trademark . CA 02239927 1998-06-30 together and calendered with two steel rolls at about 70 pounds per lineal inch. The two-ply product had the dryer side plied to the outside. When converted, the finished basis weight of the two-ply facial tissue at TAPPI standard temperature and humidity was about 17 pounds per 2880 square feet.
Examl~le 2. (Invention) A soft tissue product with reduced moisture penetration can be made in accordance with this invention using the overall process of Figure 1. More specifically, a papermaking furnish is prepared consisting of 35% northern softwood kraft (NSWK), 15%
High Maple Quinnesec and 50% Eucalyptus fibers. The Quinnesec and eucalyptus pulps are beaten together at about 3.5% consistency. The NSWK is beaten separately at about 3.5% consistency. The two pulp streams are blended together before dilution.
The blended furnish can be further diluted to about 0.1 weight percent based on dry fiber, fed to a headbox and deposited from the headbox onto a multi-layer polyester forming fabric to form the tissue web. The web is then transferred from the forming fabric to a conventional wet-pressed carrier felt. The water content of the sheet on the felt just prior to transfer to the Yankee dryer can be about 88 percent. The sheet is transferred to the Yankee dryer with a vacuum pressure roll. Nip pressure can be about 230 pounds per square inch. Sheet moisture after the pressure roll can be about 42 percent. Theadhesive mixture sprayed onto the Yankee surface just before the pressure roll can consist of about 20 percent polyvinyl alcohol, 35 percent polyamide resin (KymeneLX) and 45 percent sizing agent (PTD-M-1332 or PTD-M-1331 available from Hercules Inc.). The spray application rate can be about 8 pounds of dry chemical per metric ton of fiber. A
natural gas heated hood partially enclosing the Yankee can have a supply air temperature of 626 degrees Fahrenheit to assist in drying. Sheet moisture after the creping blade can be about 2.0 percent. Machine speed can be about 4100 feet per minute. The creperatio can be about 1.27, or 27 percent. The resulting tissue is plied together and calendered with two steel rolls at about 70 pounds per lineal inch. The two-ply product can be plied with the dryer side to the outside. When converted, the finished basis weight of the two-ply facial tissue at TAPPI standard temperature and humidity can be about 17 pounds per 2880 square feet. The resulting facial tissue can resist the penetration of moisture thus providing the benefit of keeping the user's hands dry during normal use.
This tissue can have an Absorbency Rate of from 10 to 400 seconds compared to 3 seconds for the control (Example 1).
It will be appreciated that the foregoing examples, given for purposes of illustration, are not to be considered as limiting the scope of this invention, which is defined by the following claims and all equivalents thereto.
Claims (10)
1. A method for making creped tissue comprising: (a) forming a wet tissue web bydepositing an aqueous papermaking furnish onto a forming fabric; (b) partially dewatering the tissue web; (c) applying a creping adhesive and one or more sizing agents to the surface of a Yankee dryer; (d) adhering the tissue web to the surface of the Yankee dryer such that the sizing agent is transferred to the tissue web; and (e) creping the web.
2. The method of claim 1 wherein the amount of the sizing agent added to the surface of the Yankee dryer is from 1 to 10 pounds per ton of fiber.
3. The method of claim 1 wherein the amount of sizing agent added to the surface of the Yankee dryer is from 1.5 to 3 pounds per ton of fiber.
4. The method of claim 1 wherein the amount of sizing agent added to the surface of the Yankee dryer is from 2 to 2.5 pounds per ton of fiber.
5. The method of claim 1 wherein the Absorbency Rate of the creped web is 10 seconds or greater.
6. The method of claim 1 wherein the Absorbency Rate of the creped web is 100 seconds or greater.
7. The method of claim 1 wherein the Absorbency Rate of the creped web is 200 seconds or greater.
8. The method of claim 1 wherein the Absorbency Rate of the creped web is 300 seconds or greater.
9. The method of claim 1 wherein the Absorbency Rate of the creped web is from about 100 to 400 seconds.
10. A creped web produced by the method of claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US89781097A | 1997-07-21 | 1997-07-21 | |
| US08/897,810 | 1997-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2239927A1 true CA2239927A1 (en) | 1999-01-21 |
Family
ID=29401904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2239927 Abandoned CA2239927A1 (en) | 1997-07-21 | 1998-06-30 | Method of applying chemical sizing agents for making reduced wet-through tissue |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2239927A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6241850B1 (en) | 1999-06-16 | 2001-06-05 | The Procter & Gamble Company | Soft tissue product exhibiting improved lint resistance and process for making |
| CN112888820A (en) * | 2018-10-19 | 2021-06-01 | 维美德股份公司 | Yankee dryer adhesive compositions and methods of using these compositions |
| CN114921997A (en) * | 2022-05-11 | 2022-08-19 | 山东太阳生活用纸有限公司 | Equipment for preparing single-photopaper and preparation method |
-
1998
- 1998-06-30 CA CA 2239927 patent/CA2239927A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6241850B1 (en) | 1999-06-16 | 2001-06-05 | The Procter & Gamble Company | Soft tissue product exhibiting improved lint resistance and process for making |
| CN112888820A (en) * | 2018-10-19 | 2021-06-01 | 维美德股份公司 | Yankee dryer adhesive compositions and methods of using these compositions |
| CN112888820B (en) * | 2018-10-19 | 2023-02-28 | 维美德股份公司 | Yankee dryer adhesive compositions and methods of using these compositions |
| CN114921997A (en) * | 2022-05-11 | 2022-08-19 | 山东太阳生活用纸有限公司 | Equipment for preparing single-photopaper and preparation method |
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