CA2019498A1 - Layered two-ply tissue process and product - Google Patents
Layered two-ply tissue process and productInfo
- Publication number
- CA2019498A1 CA2019498A1 CA002019498A CA2019498A CA2019498A1 CA 2019498 A1 CA2019498 A1 CA 2019498A1 CA 002019498 A CA002019498 A CA 002019498A CA 2019498 A CA2019498 A CA 2019498A CA 2019498 A1 CA2019498 A1 CA 2019498A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- tissue
- fibers
- layer
- ply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/14—Making cellulose wadding, filter or blotting paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
Abstract
ABSTRACT
A soft tissue product is made by forming a layered web with a crescent former, wherein the layer of the web which is in contact with the felt contains a substantial amount of short fibers, such as eucalyptus fibers. The tissue web is dried such that the opposite side of the web is pressed against the dryer surface and creped. The resulting tissue web is plied together with another tissue web such that the layers containing the substantial amount of short fibers become the outwardly facing layers of the two-ply tissue product.
A soft tissue product is made by forming a layered web with a crescent former, wherein the layer of the web which is in contact with the felt contains a substantial amount of short fibers, such as eucalyptus fibers. The tissue web is dried such that the opposite side of the web is pressed against the dryer surface and creped. The resulting tissue web is plied together with another tissue web such that the layers containing the substantial amount of short fibers become the outwardly facing layers of the two-ply tissue product.
Description
PATENT
LAYERED TWO-PLY TISSUE PROCESS AND PRODUCT
Background of the Invention In the manufacture of tissue products such as facial and bathroom t;ssue, it is known to improve the softness of the tissue by incorporating hard~ood fibers into the tissue furnish. This can be accomplished by using a blended furnish or by making a layered product in which the hardwood fibers are concentrated in the outer 10 layers. An example of a layered tissue process and product is ,~
provided by U.S. Patent No. 4,300,981 to Carstens, in which a tissue !
web having 60% or more short fibers in the outer layer is disclosed. '`
However, conventional wisdom in the tissue industry, as evidenced by I
Carstens, is that in order to obtain a softer, smoother tissue, it is preferred to use the dryer side of the tissue web as the outwardly facing surface of the final tissue product. ~his is because the dryer side of the tissue web (the side that is in contact with the dryer during drying and creping) experiences the greatest degree of debonding during creping and hence is traditionally viewed as the softer of the two sides of the tissue web. Hence commercially available layered prior art tissue is made by placing the hardwood layer against the dryer surface and positioning that layer as the outwardly facing surface of the final produc~. However, it has now been discovered that by producing a layered tissue web with a former commonly known in the industry as a crescent former, in which a tissue web is initially formed between a forming wire and a papermaking felt, a superior product can be made with a lesser amount of short fibers. In addition, such a process provides a nulnber of process advantages which make it even more desirable.
Summary of the Inven-tion In one aspect, the invention resides ln a method for making a two-ply tissue product comprising: (a) depositing a stratified aqueous slurry o-f papermaking fibers between a forming wire and a felt to form a layered embryonic web, said embryonic web having a first layer of fibers comprising a substantial amount of short fibers in contacting relationship with -the felt and a second layer of fibers, preferably of predominantly long fibers, which provides most of the strength of the resulting tissue web and which is in contacting relationship with the forming wire; (b) dewatering the web, preferably to a consistency of about 30 weight percent or greater; (c) adhering the dewatered web to the surface of a rotating drying cylinder and drying the web, wherein the second layer is in contacting relationship with the surface of the drying cylinder; (d) creping the dried web to form a tissue web; and (e) converting the tissue web into a two-ply tissue product wherein the first lay~r of the tissue web is positioned as an outwardly facing surface of the tissue product.
In another aspect, the invention resides in a two-ply tissue product made by the method described herein.
It has been found that the method of this invention offers a large number of advantages. First, the resulting product has surprising softness and is preferred by users relative to untreated commercially available tissues made in the conventional manner. In addition, forming the embryonic web with the second layer, which is preferably predominantly long fibers, in contact with the forming wire provides a filter and forming base for the short fibers of the first layer and results in higher fiber retention than forming with a substantial amount of short fibers against the forming wire. Also, applying a predominantly long fiber layer against the drying/creping cylinder reduces the amount of dust generated during creping, both in the tissue web and in the manufacturing environment. Further, by winding two of these plies together with the dryer (dustier) side inward to convert the plies into a two-ply tissue product, the dust level in the manufacturing and converting areas of the mill are further reduced. Furthermore, such a two-ply tissue product exhibits reduced lint in use because the dustier sides of each of the two tissue webs are plied toge-ther ~nwardly in the middle of the tissue product. This is a significant benePit to the user, for which lint is a common complaint when using tissues having a significant level of hardwood fibers.
For purposes herein, a tissue web is a web suitable for use as a facial or bath tissue and having a finished basis weight of from about 5 to about 15 pounds per 2880 square feet per ply. Creped Jr, . ~
2 ~ .$
tissue web densities can be from about 0.1 to about 0.3 grams per cublc cent;meter. Strengths in the machine direction can be from about 100 to about 1000 grams per inch of width, preferably from about 200 to about 350 grams per inch of width. Tensile strengths in the cross-machine direction can be from about 50 to about 500 grams per inch of width, preferably from about 100 to about 250 grams per inch of width. Such webs are preferably made from natural cellulosic fiber sources such as hardwoods, softwoods, and nonwoody species, but can also contain significant amounts of synthetic fibers.
Brief Description of the Drawina Figure 1 is a schematic flow diagram of the method of this invention.
Figure 2 is a schematic flow diagram of the converting step of this invention, depicting plying of two creped webs together such that the layers containing a substantial amount of short fibers are the outwardly facing surfaces of the final tissue product.
Detailed Description of the Invention Referring to Figure 1, the invention will be described in greater detail. Shown is a multi-layered headbox 1 which can have one, two, or more internal d;viders for separating different furnishes during formation of an embryonic web. ~eadboxes of this kind are well known in the paper industry and a wide variety of suitable designs are available. Not shown is the stock system for supplying the multi-layered headbox with different furnishes used to form the different layers within the tissue. In operation, the headbox deposits a stratified aqueous slurry of papermaking fibers between a forming wire 2 and a felt 3. Each of the strata consis-ts of a fibrous sl~rry of different characteristics. The felt is wrapped around the forming roll 4. The forming wire is also partially wrapped around the forming roll, but to a lesser extent, and simultaneously spans the gap between the breast roll 5 and the wire take-off roll 6. Remaining rolls 7, ~, 9, and 10 provide means to properly adjust the tension of the forming wire. The relative positions of the forming roll, the breast roll, and the wire take-off roll must be adjusted to optimize the forminy process.
The forming wire is characterized by a weave which provides immediate water drainage while providing adequate support for the fibers deposited thereon. Typically these fabrics are made of polyester or nylon and have a mesh of at least about 80 and a count of at least about 100. On the other hand, the felt is characterized by a fabric construction which absorbs or wicks away water from the embryonic web to assist in dewatering and which causes the embryonic web to adhere to the felt. Typically felts are made of a woven base with graded layers of batt needled into the base, with finished weights of from at least about 3.6 ounces per square foot to about 5 ounces per square foot.
The layered embryonic web contains at least two layers or strata. The first layer 15, which is in contacting relationship with the felt, comprises a substantial amount of short fibers such as hardwood fibers. Suitably, the amount of short fibers constitutes at least 40 weight percent of the fiber content of the layer.
Preferably, the amount of short fibers is from about 50 to about 60 weight percent of the layer, although amounts up to 100 percent can be used to further alter the surface characteristics of the web.
Because of the presence of substantial amounts of short fibers which tend to form webs of low strength, the fiber composition of this first layer generally exhibits a handsheet TAPPI burst factor of about 15 meters2 per gram2, second layer 16, which is in contacting relationship with the forming wire, can be of any composition which provides sufficient strength to the resulting tissue web for its intended use and preferably consists predominantly (50 dry weight percent or greater) of long fibers such as softwood fibers. For purposes herein, short fibers are those which have an average length of from about 0.25 m;llimeters to about 1.50 millimeters and primarily include hardwood fibers, such as eucalyptus f;bers. Long fibers are those which have an average length greater than about 1.50 millimeters and pr1marily include softwood fibers. The strength layer fiber composition exhibits a greater handsheet TAPPI burst factor than the layer 15, wh;ch preferably ;s about 30 meters squared per gram squared.
In the vicinity between the forming roll 4 and the wire take-off roll 6; the forming wire is passively disengaged from the embryon;c web, which remains with the felt. The embryonic web is dewatered by the absorbent ac~ion of the felt as the felt carries the web to the rotating drying cylinder 2~. Transfer of the dewatered web to the drying cylinder takes place at the pressure roll 21, which presses the dewatered web against the surface of the drying cylinder. The degree of hardness of the pressure roll can vary, although pressure rolls hav;ng a hardness of about 38 P&J (as measured on the Pusey and ~ones scale~ are preferred. Adhesion of the dewatered web to the drying cylinder is accomplished by the presence of moisture in the web and is preferably augmented by the presence of a creping adhesive, which is applied by a suitable spray device 22 as shown.
The creping adhesive can be any creping adhesive which provides the appropriate level of adhesion for the particular web composition and basis weight. Such adhesives are well known in the papermaking industry. Particular adhesives which have been found to work well are those based on polyvinyl alcohol. The web is then dried to about 5 weight percent moisture and is dislodged from the drying cylinder by contact with the doctor blade 23, which crepes the web. Because the second layer of the web (dryer side) is against the dryer surface, the formation of lint is minimized while the web is softened, particularly if the second layer primarily contains long fibers. The creped web is then wound onto a soft roll 24 with the aid of a reel drum 25.
Figure 2 illustrates a method or combining two of the layered webs made as described above to form a two-ply facial tissue in accordance with this invention. Shown are two soft rolls 24 being unwound and brought together in a nip formed between a first pair of steel calender rolls 31 and 32 followed by a second pair of steel calender rolls 33 and 34. The calendered webs are then crimped together between an anvil roll 35 and a crimper wheel 36. The crimped webs, now a two-ply basesheet, are then appropriately slit between an anvil roll 37 and a slitter roll 38 and wound onto a hardroll 40, from which the tissue web ls Further converted (folded, inter~olded, packaged) into the final tissue product.
,j ,, . ~
Examples Examplç l: Makinq the tissue web.
A tissue web was made as illustrated in ~igures 1 and 2. More specifically, a layered headbox was used to form a two-layered embryonic web between the felt and the forming wire. The layer against the felt (first layer) consisted of 100 dry weight percent eucalyptus fibers provided as an aqueous slurry having a consistency of about 0.14 weight percent. The layer against the forming wire (second layer) consisted of 100 dry weight percent northern softwood kraft fibers provided as an aqueous slurry having a consistency o~
about 0.14 weight percent. The forming wire was an 84 mesh polyester fabric manufactured by Appleton ~ire Company, Appleton, Wisconsin.
The felt was a Yankee pick-up felt also manufactured by Appleton Wire Company. The embryonic layered web was dewatered to a consistency of about 40 weight percent before being transferred to a Yankee dryer with the second layer against the surface of the dryer. Transfer to the dryer was effected with a soft pressure roll having a hardness of about 38 P&J. A creping adhesive consisting of a mixture of polyv;nyl alcohol, KYMENE, and Quaker release agent was used to enhance the adhesion of the web to the Yankee dryer. The web was creped at about 5 weight percent moisture and the resulting tissue web was wound onto a softroll.
Two softrolls of tissue webs, each made as described above, were plied together as described above in reference to Figure 2. The two-ply basesheet was converted into two-ply fac~al tissue having a finished basis weight of about 18.5 pounds per 2880 square feet with the first layer of each ply positioned as the outwardly fac~ng surface of the tissue product.
Example 2: Makinq the tissue web.
A two-ply facial tissue was made as described in Example 1, except the furnish of the layer against the felt (first layer) was about 50 dry weight percent eucalyptus fibers and about 50 dry weight percent northern softwood kraft fibers and was unrefined. The furnish of the layer against the forming wire (second layer) was the same, but was highly refined to provide sufficient strength. The finished basis weight of the two-ply facial tissue was about 19 pounds per 2880 square feet.
Example 3: Making the tissue web.
A two-ply facial tissue was made as described in Example 1, except the furnish of the layer against the felt (first layer) was about 55 dry weight percent eucalyptus fibers and about 45 dry we;ght percent northern softwood kraft fibers and was unrefined. The furnish of the layer against the forming wire (second layer) was the same, but was highly refined to provide sufficient strength. The finished basis we;ght of the two-ply tissue product was about 19 pounds per 2880 square feet.
ExamDle 4: Consumer evaluations.
Two-ply facial tissues made as described in Examples l and 2 were placed with consumers in test cells of 100 subjects each. The consumers were given unidenti~ied sample facial tissues to view and handle and were asked to determine which sample was softer. In the evaluations, tissue samples of Examples 1 and 2 were compared to a commercially-available two-ply facial tissue (PUFFS), each ply of which is layered and having an outer layer of about 100% eucalyptus fibers which during manufacture is positioned against the creping cylinder surface. In the test cells comparing facial tissues of Example 1 versus PUFFS, on average about 58 percent selected Example 1 as being softer, about 20 percent selected PUFFS as being softer, and about 22 percent had no preference. In the test cells comparing facial tissues o~F Example 2 versus PUFFS, on average about 54 percent selected Example 2 as being softer, about 39 percent selected PUFFS
as being softer, and about 7 percent had no preference. In the test cells comparing facial tissues of Example 3 versus PUFFS, on average about S1 percent selected Example 3 as being softer, about 30 percent selected PUFFS as being softer, and about 19 percent had no preference. These results are statistically signiFicant and illustrate that the method of this invention produces tissue products which are superior in softness, either with an equal percentage or with a lesser percentage of eucalyptus fibers in the outer layer o-F
the tissue. This is not only an advantage from a product performance standpoint, but is also an advanta~e from an economic standpoint because of the relatively greater expense of eucalyptus fibers compared to soFtwood fibers.
LAYERED TWO-PLY TISSUE PROCESS AND PRODUCT
Background of the Invention In the manufacture of tissue products such as facial and bathroom t;ssue, it is known to improve the softness of the tissue by incorporating hard~ood fibers into the tissue furnish. This can be accomplished by using a blended furnish or by making a layered product in which the hardwood fibers are concentrated in the outer 10 layers. An example of a layered tissue process and product is ,~
provided by U.S. Patent No. 4,300,981 to Carstens, in which a tissue !
web having 60% or more short fibers in the outer layer is disclosed. '`
However, conventional wisdom in the tissue industry, as evidenced by I
Carstens, is that in order to obtain a softer, smoother tissue, it is preferred to use the dryer side of the tissue web as the outwardly facing surface of the final tissue product. ~his is because the dryer side of the tissue web (the side that is in contact with the dryer during drying and creping) experiences the greatest degree of debonding during creping and hence is traditionally viewed as the softer of the two sides of the tissue web. Hence commercially available layered prior art tissue is made by placing the hardwood layer against the dryer surface and positioning that layer as the outwardly facing surface of the final produc~. However, it has now been discovered that by producing a layered tissue web with a former commonly known in the industry as a crescent former, in which a tissue web is initially formed between a forming wire and a papermaking felt, a superior product can be made with a lesser amount of short fibers. In addition, such a process provides a nulnber of process advantages which make it even more desirable.
Summary of the Inven-tion In one aspect, the invention resides ln a method for making a two-ply tissue product comprising: (a) depositing a stratified aqueous slurry o-f papermaking fibers between a forming wire and a felt to form a layered embryonic web, said embryonic web having a first layer of fibers comprising a substantial amount of short fibers in contacting relationship with -the felt and a second layer of fibers, preferably of predominantly long fibers, which provides most of the strength of the resulting tissue web and which is in contacting relationship with the forming wire; (b) dewatering the web, preferably to a consistency of about 30 weight percent or greater; (c) adhering the dewatered web to the surface of a rotating drying cylinder and drying the web, wherein the second layer is in contacting relationship with the surface of the drying cylinder; (d) creping the dried web to form a tissue web; and (e) converting the tissue web into a two-ply tissue product wherein the first lay~r of the tissue web is positioned as an outwardly facing surface of the tissue product.
In another aspect, the invention resides in a two-ply tissue product made by the method described herein.
It has been found that the method of this invention offers a large number of advantages. First, the resulting product has surprising softness and is preferred by users relative to untreated commercially available tissues made in the conventional manner. In addition, forming the embryonic web with the second layer, which is preferably predominantly long fibers, in contact with the forming wire provides a filter and forming base for the short fibers of the first layer and results in higher fiber retention than forming with a substantial amount of short fibers against the forming wire. Also, applying a predominantly long fiber layer against the drying/creping cylinder reduces the amount of dust generated during creping, both in the tissue web and in the manufacturing environment. Further, by winding two of these plies together with the dryer (dustier) side inward to convert the plies into a two-ply tissue product, the dust level in the manufacturing and converting areas of the mill are further reduced. Furthermore, such a two-ply tissue product exhibits reduced lint in use because the dustier sides of each of the two tissue webs are plied toge-ther ~nwardly in the middle of the tissue product. This is a significant benePit to the user, for which lint is a common complaint when using tissues having a significant level of hardwood fibers.
For purposes herein, a tissue web is a web suitable for use as a facial or bath tissue and having a finished basis weight of from about 5 to about 15 pounds per 2880 square feet per ply. Creped Jr, . ~
2 ~ .$
tissue web densities can be from about 0.1 to about 0.3 grams per cublc cent;meter. Strengths in the machine direction can be from about 100 to about 1000 grams per inch of width, preferably from about 200 to about 350 grams per inch of width. Tensile strengths in the cross-machine direction can be from about 50 to about 500 grams per inch of width, preferably from about 100 to about 250 grams per inch of width. Such webs are preferably made from natural cellulosic fiber sources such as hardwoods, softwoods, and nonwoody species, but can also contain significant amounts of synthetic fibers.
Brief Description of the Drawina Figure 1 is a schematic flow diagram of the method of this invention.
Figure 2 is a schematic flow diagram of the converting step of this invention, depicting plying of two creped webs together such that the layers containing a substantial amount of short fibers are the outwardly facing surfaces of the final tissue product.
Detailed Description of the Invention Referring to Figure 1, the invention will be described in greater detail. Shown is a multi-layered headbox 1 which can have one, two, or more internal d;viders for separating different furnishes during formation of an embryonic web. ~eadboxes of this kind are well known in the paper industry and a wide variety of suitable designs are available. Not shown is the stock system for supplying the multi-layered headbox with different furnishes used to form the different layers within the tissue. In operation, the headbox deposits a stratified aqueous slurry of papermaking fibers between a forming wire 2 and a felt 3. Each of the strata consis-ts of a fibrous sl~rry of different characteristics. The felt is wrapped around the forming roll 4. The forming wire is also partially wrapped around the forming roll, but to a lesser extent, and simultaneously spans the gap between the breast roll 5 and the wire take-off roll 6. Remaining rolls 7, ~, 9, and 10 provide means to properly adjust the tension of the forming wire. The relative positions of the forming roll, the breast roll, and the wire take-off roll must be adjusted to optimize the forminy process.
The forming wire is characterized by a weave which provides immediate water drainage while providing adequate support for the fibers deposited thereon. Typically these fabrics are made of polyester or nylon and have a mesh of at least about 80 and a count of at least about 100. On the other hand, the felt is characterized by a fabric construction which absorbs or wicks away water from the embryonic web to assist in dewatering and which causes the embryonic web to adhere to the felt. Typically felts are made of a woven base with graded layers of batt needled into the base, with finished weights of from at least about 3.6 ounces per square foot to about 5 ounces per square foot.
The layered embryonic web contains at least two layers or strata. The first layer 15, which is in contacting relationship with the felt, comprises a substantial amount of short fibers such as hardwood fibers. Suitably, the amount of short fibers constitutes at least 40 weight percent of the fiber content of the layer.
Preferably, the amount of short fibers is from about 50 to about 60 weight percent of the layer, although amounts up to 100 percent can be used to further alter the surface characteristics of the web.
Because of the presence of substantial amounts of short fibers which tend to form webs of low strength, the fiber composition of this first layer generally exhibits a handsheet TAPPI burst factor of about 15 meters2 per gram2, second layer 16, which is in contacting relationship with the forming wire, can be of any composition which provides sufficient strength to the resulting tissue web for its intended use and preferably consists predominantly (50 dry weight percent or greater) of long fibers such as softwood fibers. For purposes herein, short fibers are those which have an average length of from about 0.25 m;llimeters to about 1.50 millimeters and primarily include hardwood fibers, such as eucalyptus f;bers. Long fibers are those which have an average length greater than about 1.50 millimeters and pr1marily include softwood fibers. The strength layer fiber composition exhibits a greater handsheet TAPPI burst factor than the layer 15, wh;ch preferably ;s about 30 meters squared per gram squared.
In the vicinity between the forming roll 4 and the wire take-off roll 6; the forming wire is passively disengaged from the embryon;c web, which remains with the felt. The embryonic web is dewatered by the absorbent ac~ion of the felt as the felt carries the web to the rotating drying cylinder 2~. Transfer of the dewatered web to the drying cylinder takes place at the pressure roll 21, which presses the dewatered web against the surface of the drying cylinder. The degree of hardness of the pressure roll can vary, although pressure rolls hav;ng a hardness of about 38 P&J (as measured on the Pusey and ~ones scale~ are preferred. Adhesion of the dewatered web to the drying cylinder is accomplished by the presence of moisture in the web and is preferably augmented by the presence of a creping adhesive, which is applied by a suitable spray device 22 as shown.
The creping adhesive can be any creping adhesive which provides the appropriate level of adhesion for the particular web composition and basis weight. Such adhesives are well known in the papermaking industry. Particular adhesives which have been found to work well are those based on polyvinyl alcohol. The web is then dried to about 5 weight percent moisture and is dislodged from the drying cylinder by contact with the doctor blade 23, which crepes the web. Because the second layer of the web (dryer side) is against the dryer surface, the formation of lint is minimized while the web is softened, particularly if the second layer primarily contains long fibers. The creped web is then wound onto a soft roll 24 with the aid of a reel drum 25.
Figure 2 illustrates a method or combining two of the layered webs made as described above to form a two-ply facial tissue in accordance with this invention. Shown are two soft rolls 24 being unwound and brought together in a nip formed between a first pair of steel calender rolls 31 and 32 followed by a second pair of steel calender rolls 33 and 34. The calendered webs are then crimped together between an anvil roll 35 and a crimper wheel 36. The crimped webs, now a two-ply basesheet, are then appropriately slit between an anvil roll 37 and a slitter roll 38 and wound onto a hardroll 40, from which the tissue web ls Further converted (folded, inter~olded, packaged) into the final tissue product.
,j ,, . ~
Examples Examplç l: Makinq the tissue web.
A tissue web was made as illustrated in ~igures 1 and 2. More specifically, a layered headbox was used to form a two-layered embryonic web between the felt and the forming wire. The layer against the felt (first layer) consisted of 100 dry weight percent eucalyptus fibers provided as an aqueous slurry having a consistency of about 0.14 weight percent. The layer against the forming wire (second layer) consisted of 100 dry weight percent northern softwood kraft fibers provided as an aqueous slurry having a consistency o~
about 0.14 weight percent. The forming wire was an 84 mesh polyester fabric manufactured by Appleton ~ire Company, Appleton, Wisconsin.
The felt was a Yankee pick-up felt also manufactured by Appleton Wire Company. The embryonic layered web was dewatered to a consistency of about 40 weight percent before being transferred to a Yankee dryer with the second layer against the surface of the dryer. Transfer to the dryer was effected with a soft pressure roll having a hardness of about 38 P&J. A creping adhesive consisting of a mixture of polyv;nyl alcohol, KYMENE, and Quaker release agent was used to enhance the adhesion of the web to the Yankee dryer. The web was creped at about 5 weight percent moisture and the resulting tissue web was wound onto a softroll.
Two softrolls of tissue webs, each made as described above, were plied together as described above in reference to Figure 2. The two-ply basesheet was converted into two-ply fac~al tissue having a finished basis weight of about 18.5 pounds per 2880 square feet with the first layer of each ply positioned as the outwardly fac~ng surface of the tissue product.
Example 2: Makinq the tissue web.
A two-ply facial tissue was made as described in Example 1, except the furnish of the layer against the felt (first layer) was about 50 dry weight percent eucalyptus fibers and about 50 dry weight percent northern softwood kraft fibers and was unrefined. The furnish of the layer against the forming wire (second layer) was the same, but was highly refined to provide sufficient strength. The finished basis weight of the two-ply facial tissue was about 19 pounds per 2880 square feet.
Example 3: Making the tissue web.
A two-ply facial tissue was made as described in Example 1, except the furnish of the layer against the felt (first layer) was about 55 dry weight percent eucalyptus fibers and about 45 dry we;ght percent northern softwood kraft fibers and was unrefined. The furnish of the layer against the forming wire (second layer) was the same, but was highly refined to provide sufficient strength. The finished basis we;ght of the two-ply tissue product was about 19 pounds per 2880 square feet.
ExamDle 4: Consumer evaluations.
Two-ply facial tissues made as described in Examples l and 2 were placed with consumers in test cells of 100 subjects each. The consumers were given unidenti~ied sample facial tissues to view and handle and were asked to determine which sample was softer. In the evaluations, tissue samples of Examples 1 and 2 were compared to a commercially-available two-ply facial tissue (PUFFS), each ply of which is layered and having an outer layer of about 100% eucalyptus fibers which during manufacture is positioned against the creping cylinder surface. In the test cells comparing facial tissues of Example 1 versus PUFFS, on average about 58 percent selected Example 1 as being softer, about 20 percent selected PUFFS as being softer, and about 22 percent had no preference. In the test cells comparing facial tissues o~F Example 2 versus PUFFS, on average about 54 percent selected Example 2 as being softer, about 39 percent selected PUFFS
as being softer, and about 7 percent had no preference. In the test cells comparing facial tissues of Example 3 versus PUFFS, on average about S1 percent selected Example 3 as being softer, about 30 percent selected PUFFS as being softer, and about 19 percent had no preference. These results are statistically signiFicant and illustrate that the method of this invention produces tissue products which are superior in softness, either with an equal percentage or with a lesser percentage of eucalyptus fibers in the outer layer o-F
the tissue. This is not only an advantage from a product performance standpoint, but is also an advanta~e from an economic standpoint because of the relatively greater expense of eucalyptus fibers compared to soFtwood fibers.
3 ~
It will be appreciated that the foregoing examples are given for purposes of illustration and are not to be construed as limiting the scope of this invention, which is defined by the following claims:
`, --i ' 1
It will be appreciated that the foregoing examples are given for purposes of illustration and are not to be construed as limiting the scope of this invention, which is defined by the following claims:
`, --i ' 1
Claims (9)
1. A method of making a two-ply tissue product comprising:
(a) depositing a stratified aqueous slurry of papermaking fibers between a forming wire and a felt to form a layered embryonic web, said embryonic web having a first layer of fibers comprising a substantial amount of short fibers in contacting relationship with the felt and a second layer of fibers which provides most of the strength of the resulting tissue web and is in contacting relationship with the forming wire;
(b) dewatering the embryonic web;
(c) adhering the dewatered web to the surface of a rotating drying cylinder and drying the web, wherein the second layer is in contacting relationship with the surface of the drying cylinder;
(d) creping the dried web to form a tissue web; and (e) converting the tissue web into a two-ply tissue product wherein the first layer of the tissue web is positioned as an outwardly facing surface of the tissue product.
(a) depositing a stratified aqueous slurry of papermaking fibers between a forming wire and a felt to form a layered embryonic web, said embryonic web having a first layer of fibers comprising a substantial amount of short fibers in contacting relationship with the felt and a second layer of fibers which provides most of the strength of the resulting tissue web and is in contacting relationship with the forming wire;
(b) dewatering the embryonic web;
(c) adhering the dewatered web to the surface of a rotating drying cylinder and drying the web, wherein the second layer is in contacting relationship with the surface of the drying cylinder;
(d) creping the dried web to form a tissue web; and (e) converting the tissue web into a two-ply tissue product wherein the first layer of the tissue web is positioned as an outwardly facing surface of the tissue product.
2. The method of Claim 1 wherein the short fibers are hardwood fibers.
3. The method of Claim 2 wherein the hardwood fibers are eucalyptus fibers.
4. The method of Claim 1 wherein the second layer primarily comprises long fibers.
5. The method of Claim 1 wherein the first layer contains at least about 40 dry weight percent short fibers.
6. The method of Claim 5 wherein the amount of short fibers in the first layer is from about 50 to about 60 dry weight percent.
7. The method of Claim 5 wherein the amount of short fibers in the first layer is from about 50 to about 55 dry weight percent.
8. A two-ply facial tissue made by the method of Claim 1.
9. A two-ply facial tissue made by the method of Claim 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US37042789A | 1989-06-23 | 1989-06-23 | |
| US370,427 | 1989-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2019498A1 true CA2019498A1 (en) | 1990-12-23 |
Family
ID=23459619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002019498A Abandoned CA2019498A1 (en) | 1989-06-23 | 1990-06-21 | Layered two-ply tissue process and product |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0404189B1 (en) |
| JP (1) | JPH0327194A (en) |
| KR (1) | KR0151589B1 (en) |
| AT (1) | ATE114754T1 (en) |
| AU (1) | AU628575B2 (en) |
| CA (1) | CA2019498A1 (en) |
| DE (1) | DE69014433T2 (en) |
| ES (1) | ES2064536T3 (en) |
| TR (1) | TR25429A (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5180471A (en) * | 1991-01-09 | 1993-01-19 | Kimberly-Clark Corporation | Non-nesting multi-ply tissue and method for making same |
| US6136147A (en) * | 1994-08-01 | 2000-10-24 | Kimberly-Clark Worldwide, Inc. | Method for applying debonding materials to a tissue |
| US6419790B1 (en) | 1996-05-09 | 2002-07-16 | Fort James Corporation | Methods of making an ultra soft, high basis weight tissue and product produced thereby |
| CA2204453A1 (en) * | 1996-05-09 | 1997-11-09 | R. Heath Reeves | Method of rendering wood pulp keratotic and a method of making an ultra soft, high basis weight tissue and product produced thereby |
| CA2204452C (en) * | 1996-05-09 | 2007-03-27 | Joseph C. Leege | Method of making an ultra soft, high basis weight tissue and product produced thereby |
| US6733626B2 (en) | 2001-12-21 | 2004-05-11 | Georgia Pacific Corporation | Apparatus and method for degrading a web in the machine direction while preserving cross-machine direction strength |
| US6861380B2 (en) * | 2002-11-06 | 2005-03-01 | Kimberly-Clark Worldwide, Inc. | Tissue products having reduced lint and slough |
| JP4944054B2 (en) * | 2008-03-10 | 2012-05-30 | 王子ネピア株式会社 | Ply bonding apparatus and sanitary paper manufacturing method |
| DE102008060152A1 (en) * | 2008-12-02 | 2010-06-10 | Mahle International Gmbh | Method of manufacturing wet filter medium, particularly for manufacturing wet filter paper, involves applying fiber-water mixture on sieve- or needle felt structure impermeable for fibers |
| US9416494B2 (en) | 2012-12-26 | 2016-08-16 | Kimberly-Clark Worldwide, Inc. | Modified cellulosic fibers having reduced hydrogen bonding |
| US9410292B2 (en) | 2012-12-26 | 2016-08-09 | Kimberly-Clark Worldwide, Inc. | Multilayered tissue having reduced hydrogen bonding |
| JP6393997B2 (en) * | 2014-02-07 | 2018-09-26 | 王子ホールディングス株式会社 | Manufacturing method of sanitary thin paper products |
| TR201815851T4 (en) * | 2014-05-15 | 2018-11-21 | Icone S R L | Forming section and method for paper production. |
| EP3261501B1 (en) | 2015-02-27 | 2021-09-08 | Kimberly-Clark Worldwide, Inc. | Soft, strong and bulky tissue |
| KR102573648B1 (en) | 2018-04-27 | 2023-09-06 | 킴벌리-클라크 월드와이드, 인크. | Multi-ply tissue products made from single-ply tissue webs |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3230136A (en) * | 1964-05-22 | 1966-01-18 | Kimberly Clark Co | Patterned tissue paper containing heavy basis weight ribs and fourdrinier wire for forming same |
| EP0003377A1 (en) * | 1978-01-19 | 1979-08-08 | THE PROCTER & GAMBLE COMPANY | Ply-separable absorbent paper sheet and process for its manufacture |
| US4225382A (en) * | 1979-05-24 | 1980-09-30 | The Procter & Gamble Company | Method of making ply-separable paper |
| US4300981A (en) * | 1979-11-13 | 1981-11-17 | The Procter & Gamble Company | Layered paper having a soft and smooth velutinous surface, and method of making such paper |
-
1990
- 1990-05-30 AU AU56123/90A patent/AU628575B2/en not_active Ceased
- 1990-06-15 JP JP2157425A patent/JPH0327194A/en active Pending
- 1990-06-20 TR TR90/0590A patent/TR25429A/en unknown
- 1990-06-21 CA CA002019498A patent/CA2019498A1/en not_active Abandoned
- 1990-06-22 KR KR1019900009288A patent/KR0151589B1/en not_active IP Right Cessation
- 1990-06-22 DE DE69014433T patent/DE69014433T2/en not_active Expired - Fee Related
- 1990-06-22 EP EP90111901A patent/EP0404189B1/en not_active Revoked
- 1990-06-22 AT AT90111901T patent/ATE114754T1/en not_active IP Right Cessation
- 1990-06-22 ES ES90111901T patent/ES2064536T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU5612390A (en) | 1991-01-03 |
| AU628575B2 (en) | 1992-09-17 |
| TR25429A (en) | 1993-03-01 |
| KR910001172A (en) | 1991-01-30 |
| EP0404189B1 (en) | 1994-11-30 |
| EP0404189A1 (en) | 1990-12-27 |
| ATE114754T1 (en) | 1994-12-15 |
| DE69014433T2 (en) | 1995-05-04 |
| ES2064536T3 (en) | 1995-02-01 |
| JPH0327194A (en) | 1991-02-05 |
| DE69014433D1 (en) | 1995-01-12 |
| KR0151589B1 (en) | 1998-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |