JP2009179900A - Combination nonwoven fabric for backing wallpaper, and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination nonwoven fabric for backing wallpaper having good peeling characteristics when peeling the wallpaper from a wall surface, and good coating suitability with little fluffing to be disadvantages when coating with polyvinyl chloride, and further good dimensional stability with respect to the combination nonwoven fabric for backing the wallpaper coated and processed with the polyvinyl chloride etc., and used as the wallpaper. <P>SOLUTION: The combination nonwoven fabric for backing the wallpaper includes pulp fibers and a fibrous binder in a first layer, and organic fibers and the fibrous binder in a second layer in the combination nonwoven fabric of a two-layer structure for backing the wallpaper. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laminated nonwoven fabric for wallpaper backing having a two-layer structure used as a backing paper for wallpaper. More specifically, the surface layer of the wallpaper is provided on the surface of the second layer and used as the wallpaper, and the first layer surface opposite to the surface of the second layer on which the surface layer of the wallpaper is provided is pasted to the wall surface using glue. In the laminated nonwoven fabric for wallpaper backing with a two-layer structure, the dimensional stability is good and the workability is good, there is no problem such as peeling after practical use after bonding, the peel property is excellent, and the problem of fluffing The present invention relates to a laminated nonwoven fabric for wallpaper backing having printing and coating suitability.

  Conventionally, it has a low price and has various processing aptitudes such as printing, foaming, embossing, etc., so vinyl wallpaper etc. with abundant design and color patterns are used as interior decoration materials for interior decoration. Widely used.

  When installing the wallpaper on the wall, apply a water-soluble glue such as starch, vinyl acetate emulsion or methylcellulose on the back of the wallpaper with a roll coater, fold it with the glue side of the glued wallpaper inside, and leave it for a while until it is put on the wall. After that, affixing work to the wall surface is performed. In this state from pasting to construction, the wallpaper backing paper is curled or stretched by water-soluble glue. In addition, when the paste is completely dried several days after being attached to a wall surface such as gypsum board or concrete, a phenomenon of contracting conversely occurs. Therefore, the backing paper for wallpaper is required to have a small dimensional change between a dry state and a wet state. As countermeasures, wallpaper (for example, see Patent Document 1) coated with polyalkylene glycol, wallpaper (for example, see Patent Document 2) impregnated with a mixed solution composed of a guanidine sulfamate derivative, a surface sizing agent, and a binder is disclosed. Yes. In addition, as an interior material having a small dimensional change, an interior material such as wallpaper having an underwater elongation of less than 1% for the purpose of mold prevention is proposed by adding a synthetic fiber or an inorganic material to a paper base material. This ensured air permeability as wallpaper (for example, refer to Patent Document 3).

  In recent years, the living space has been upgraded and diversified, and accordingly, there has been an increasing demand for wallpaper replacement by remodeling existing houses compared to newly built houses. The problem when renovating is the workability when removing the wallpaper from the wall. Accordingly, there is a need for a wallpaper that has a low peel strength when peeling the wallpaper from the wall surface and that is excellent in so-called peel characteristics. As wallpaper having excellent peel characteristics, wallpaper using methylcellulose as the glue is disclosed (for example, see Patent Document 4). Furthermore, the wallpaper is coated with a foamed polyvinyl chloride resin to enhance the design and design and to increase the volume, and a surface layer is provided. Therefore, printing aptitude and coating aptitude are required on the side on which the wallpaper backing paper is printed or the polyvinyl chloride resin coating is applied.

However, wallpaper backing paper consisting only of pulp fibers, and paper backing paper in which a synthetic fiber or inorganic material is simply added to the paper base, peels between the layers of the wallpaper due to the weak interlayer strength, and the wall paper There was a problem that not only a part of the work remained at random, but the workability was lowered, and the finished product after the replacement was uneven. In addition, there is a problem in that printing suitability and coating suitability are insufficient due to fuzz.
JP 2001-81700 A Japanese Patent Laid-Open No. 10-273896 JP 2001-303491 A JP 2005-154968 A

  An object of the present invention is to provide a laminated nonwoven fabric for wallpaper backing, which has good dimensional stability, has peel characteristics, and has printing and coating suitability.

  As a result of studies conducted by the present inventors to solve this problem, the first layer includes pulp fibers and a fibrous binder, and the second layer includes organic fibers. The present invention has been completed with the knowledge that a remarkable effect can be obtained with a laminated nonwoven fabric for wallpaper backing, characterized in that it contains a pulp fiber and a fibrous binder. Furthermore, a wallpaper backing woven nonwoven fabric in which part or all of the fibrous binder of the second layer is polyvinyl alcohol fiber (hereinafter referred to as PVA fiber), and wallpaper backing lining in which a pigment is applied to the surface of the second layer. Found a non-woven fabric.

  The first layer contains pulp fibers and a fibrous binder, and the second layer is a method for producing a laminated nonwoven fabric for wallpaper lining comprising organic fibers, pulp fibers, and fibrous binders. The present inventors have found a method for producing a laminated nonwoven fabric for wallpaper backing, characterized in that after the first layer is combined and pressed, the surface of the second layer is applied to a Yankee dryer and dried.

  According to the present invention, regarding a laminated nonwoven fabric for wallpaper backing that is used as wallpaper after being processed such as foaming polyvinyl chloride resin coating or printing, the second layer is separated by function in the first layer and the second layer. A wall with a layer that suppresses fuzz, which is a drawback during printing and coating, has coating suitability, the first layer gives peel characteristics when peeling the wallpaper from the wall surface, and both layers have good dimensional stability A laminated nonwoven fabric for lining can be provided.

  Hereinafter, the present invention will be described in detail. The two-layered wallpaper backing nonwoven fabric of the present invention is affixed to the wall surface by glue applied to the wall surface made of gypsum board or concrete or the first layer surface of the wallpaper backing nonwoven fabric. The first layer of the laminated nonwoven fabric for wallpaper lining of the present invention includes a pulp fiber, and is adjusted to be hydrophilic even if it includes a fibrous binder. Further, by using pulp fibers that are moderately beaten, there is a certain gap between the fibers, and the water absorption is adjusted. The beating degree of the pulp fiber is preferably 300 mlCSF or more, and more preferably 400 mlCSF or more. When the beating degree is less than 300 ml CSF, the gap portion may decrease and the water absorption may decrease, and the paste may become difficult to enter and immediately dry, which may reduce workability.

  The pulp fiber includes wood pulp such as softwood pulp and hardwood pulp, wood pulp such as bamboo pulp, bamboo pulp, linter pulp, kenaf pulp, and herbs as plant fibers. These fibers may be fibrillated as long as they do not impair the performance of the present invention. Further, pulp fibers obtained from waste paper, waste paper, etc. may be used. The ratio of the pulp fibers blended in the first layer of the wallpaper-backed composite nonwoven fabric of the present invention is preferably 50 to 97% by mass, more preferably 60 to 95% by mass, and more preferably 70 to 95% with respect to the entire first layer. 93 mass% is more preferable. When the amount is less than 50% by mass, strength maintenance and dimensional stability are good, but the voids increase and the required amount of glue may increase. On the other hand, if it exceeds 97% by mass, it may be difficult to maintain the strength in a wet state, and delamination may occur during reattachment. Furthermore, dimensional stability may not be obtained.

  Unlike the pulp fiber having a flat cross section, the fibrous binder blended in the first layer has a perfect circle shape or a shape close to a perfect circle shape, and increases the voids by being present between the pulp fibers. It works to maintain strength even in wet conditions by adhering poorly water-resistant pulp fibers together, and suppresses dimensional changes such as elongation when glue is applied and shrinkage after being applied and dried. There is. In addition, when removing the wallpaper constructed on the wall such as gypsum board or concrete at the time of renovation, it is important to peel it off with the glue layer existing between the wall and the wallpaper, but the pulp fiber does not contain a fibrous binder In the case of only pulp fibers and synthetic fibers only, the interlaminar strength is so weak that they peel off between the walls of the wallpaper, leaving part of the wallpaper randomly remaining on the wall, not only reducing workability but also sticking. Unevenness is created in the finished product. In the present invention, it is possible to suppress delamination of the wallpaper by blending the fibrous binder in the first layer. In this invention, 3-50 mass% is preferable with respect to the whole 1st layer, as for the ratio of the fibrous binder mix | blended with a 1st layer, 5-40 mass% is more preferable, and 7-30 mass% is further. preferable. When the amount is less than 3% by mass, not only is it difficult to maintain strength in a wet state, but delamination may occur at the time of replacement. In addition, dimensional stability may not be obtained. On the other hand, if it exceeds 50% by mass, the strength maintenance and dimensional stability are good, but the voids increase and the required amount of glue may increase.

  The fineness of the fibrous binder is preferably from 0.1 to 5.6 dtex, more preferably from 0.6 to 3.3 dtex, and even more preferably from 1.1 to 2.2 dtex. If it is less than 0.1 dtex, the nonwoven fabric may become dense and thin. On the other hand, when it exceeds 5.6 dtex, not only the contact with the pulp fiber is reduced, it may be difficult to maintain the strength under wet conditions, but a uniform texture may not be obtained. 1-20 mm is preferable, as for the fiber length of a fibrous binder, 2-15 mm is more preferable, and 3-10 mm is further more preferable. If it is less than 1 mm, it may fall out of the papermaking wire during papermaking, and sufficient strength may not be obtained. On the other hand, when it exceeds 20 mm, it may cause tangles when dispersed in water, and a uniform texture may not be obtained.

  Examples of the fibrous binder include single fibers composed of a single component, and composite fibers such as core-sheath fibers (core-shell type), parallel fibers (side-by-side type), and radially divided fibers. Since the composite fiber is difficult to form a film, it is possible to improve the water resistance strength while retaining the voids of the nonwoven fabric. Examples of the fibrous binder include polypropylene short fibers, polyester short fibers, a combination of polypropylene (core) and polyethylene (sheath), a combination of polypropylene (core) and ethylene vinyl alcohol (sheath), and a high melting point polyester (core). And a combination of low melting point polyester (sheath). In addition, a single fiber (total melt type) composed only of a low-melting resin such as polyethylene or a fibrous binder such as PVA fiber can also be used. In particular, the core-sheath fiber is preferred because it has both a void portion and strength development.

  In the present invention, in addition to the pulp fiber and the fibrous binder, the first layer can be blended with fibers other than the pulp fiber having no binder performance, if necessary, within a range not impairing the performance. As a result, the gap can be further increased. Examples of fibers other than pulp fibers include regenerated fibers such as rayon, cupra, and lyocell fibers, semi-synthetic fibers such as acetate, triacetate, and promix, polyolefin, polyamide, polyacryl, vinylon, vinylidene, polyvinyl chloride, Synthetic fibers such as polyester, benzoate, polyclar, and phenol fibers, and inorganic fibers such as metal fibers, glass fibers, and rock fibers can be added.

  The second layer of the laminated nonwoven fabric for wallpaper backing of the present invention contains pulp fibers, a fibrous binder, and organic fibers. Since the surface of the second layer is a surface on which a foaming polyvinyl chloride resin or the like is coated or printed, the second layer is made of organic fibers and is maintained with dimensional stability by a fibrous binder. An appropriate space is maintained to give a sense of volume, and the pulp fiber is filled with eyes to suppress excessive permeation during coating and printing to maintain good flatness. Furthermore, by using a part of the fibrous binder as PVA fiber, a flat surface with less fuzz is obtained, and thus the surface after coating and printing becomes smooth.

  In the second layer, when the total amount of pulp fiber, fibrous binder, and organic fiber is 100% by mass, the fibrous binder content is 2-50% by mass, preferably 4-40% by mass. Preferably it is 6-30 mass%. If it is less than 2% by mass, the dimensional stability is poor, and if it exceeds 50% by mass, there may be a problem that the amount of permeation becomes excessive during coating or printing.

  The organic fiber is a synthetic fiber other than the pulp fiber and the fibrous binder, and excludes a fiber having a flat cross-sectional shape that easily fills the gap. By blending organic fibers, the voids can be further increased. As organic fibers, rayon, cupra, lyocell fibers, etc. as regenerated fibers, acetate, triacetate, promix as semi-synthetic fibers, polyolefin, polyamide, polyacrylic, vinylon as synthetic fibers, Examples thereof include vinylidene, polyvinyl chloride, polyester, nylon, benzoate, polyclar, and phenol fibers. The blending ratio of the organic fiber is not particularly limited, but when the total blending amount of the pulp fiber, the fibrous binder, and the organic fiber is 100% by mass, 2 to 50% by mass is preferable, and 4 to 40% by mass is more preferable. 6 to 30% by mass is more preferable. If the amount is less than 2% by mass, the void retaining effect may be reduced. If the amount exceeds 50% by mass, the void may become excessive, resulting in excessive penetration during coating or printing. is there. In addition to organic fibers, inorganic fibers such as metal fibers, glass fibers and rock fibers can be added as long as the performance is not impaired.

  The fineness of the organic fiber is preferably from 0.1 to 11 dtex, more preferably from 0.6 to 5.6 dtex, and even more preferably from 1.1 to 3.3 dtex. If it is less than 0.1 dtex, the nonwoven fabric may become dense and thin. On the other hand, if it exceeds 11 decitex, the gap may become excessive, and a uniform texture may not be obtained. The fiber length of the organic fiber is preferably 1 to 20 mm, more preferably 2 to 15 mm, and still more preferably 3 to 10 mm. If it is less than 1 mm, it may fall out of the papermaking wire during papermaking. On the other hand, if it exceeds 20 mm, it may cause entanglement when dispersed in water and a uniform texture may not be obtained.

  The blending ratio of the pulp fibers is preferably 50 to 96 mass%, more preferably 60 to 90 mass%, and more preferably 70 to 85, when the blending amount of the pulp fiber, the fibrous binder, and the organic fiber is 100 mass% in total. More preferred is mass%. If it is less than 50% by mass, there are too many voids, so that the amount of permeation may be excessive during the coating of polyvinyl chloride. On the other hand, if it exceeds 96% by mass, the dimensional stability may be deteriorated.

  In the present invention, as the pulp fibers used in the second layer, the pulp fibers used in the first layer can be used. Moreover, as the fibrous binder used in the second layer, the fibrous binder used in the first layer can be used. A core-sheath fiber can be preferably used. Furthermore, it is more preferable to use the PVA fiber alone or in combination with the core-sheath fiber. The PVA fiber is a fiber manufactured under appropriate conditions using an appropriate raw material PVA, and maintains the fiber form while hardly dissolving in normal temperature water, but the surface of the second layer is in contact with the Yankee dryer surface after paper making. When it is heated, it begins to dissolve easily, and at that moment, it is pressed with equipment such as a touch roll to form a fibrous binder that straddles the fibers, and then re-solidifies by dehydration and drying. A smooth surface with little fluffing is obtained. Moreover, it becomes a strong paper layer constituting fiber which cannot be easily separated unless it is in high temperature water.

  Although various influences on the adhesive strength of the PVA fiber can be considered, it can be roughly classified into three points: an underwater softening point, a fineness, and a fiber length. First, the underwater softening point will be described. In the case of actual papermaking, the softening point in water generally indicates a temperature at which the wet paper receives heat from the dryer and the fibrous binder starts to melt and exhibits an adhesive function. The more the PVA fiber with a lower softening point in water is used, the easier the dissolution of the fibrous binder, which is a precondition for adhesion, and the greater the adhesion effect. A lower underwater softening point is better from the viewpoint of the adhesion effect, but adhesion to the dryer tends to occur. In order for the PVA fiber to dissolve, the wet paper temperature needs to be higher than the softening point in water. Therefore, the higher the drying temperature, the greater the adhesion effect and the higher the strength. When the water temperature in the wet paper is below the underwater softening point of the PVA fiber, the fibrous binder does not dissolve, and therefore the binder effect is completely lost. In the case of a Yankee dryer, the steam temperature of the dryer is about 100-160 ° C, and the temperature of the wet paper contacting this is considered to be 60-90 ° C. A sufficient adhesive force can be obtained by selecting.

  Next, as for the fineness, the strength increases as it becomes thinner. This is because, when added at the same mass ratio, if thin fibers are used, the number of additions increases and the number of adhesion points increases, so that the adhesive force increases. However, if the fineness is too small, the nonwoven fabric may be too dense. The fineness of the PVA fiber is not particularly limited, but is preferably 0.1 to 5.6 dtex, more preferably 0.3 to 3.3 dtex, and still more preferably 0.6 to 2.2 dtex. Finally, the fiber length of the PVA fiber is preferably 1 to 20 mm, more preferably 2 to 15 mm, and still more preferably 3 to 10 mm. If it is less than 1 mm, it may fall out of the papermaking wire during papermaking, and sufficient strength may not be obtained. On the other hand, if it exceeds 20 mm, it may cause entanglement when dispersed in water and a uniform texture may not be obtained.

The basis weight of the laminated nonwoven fabric for wallpaper backing of the present invention is not particularly limited, but is preferably 15 g / m ² or more, and more preferably 60 g / m ² or more. If it is less than 15 g / m ^2, there is a problem in tensile strength and hardness, and there is a risk of curling or paper breakage during coating or printing. On the other hand, the curling and paper-breaking suppressing effect hardly changes in a region where the basis weight exceeds 200 g / m ² , so the basis weight is preferably 200 g / m ² or less, and may be 150 g / m ² or less. .

The basis weight of the first layer is preferably 5 g / m ² or more, and more preferably 20 g / m ² or more. When the amount is less than 5 g / m ² , when water-soluble glue is applied to the surface of the first layer, the glue reaches the second layer and may not play the role of the first layer. On the other hand, since the effect of suppressing the penetration of the glue hardly changes in the region where the basis weight exceeds 100 g / m ² , the basis weight of the first layer is preferably 100 g / m ² or less, and preferably 80 g / m ^2. It is good also as follows.

The basis weight of the second layer is preferably 10 g / m ² or more, 30 g / m ² or more is more preferable. If it is less than 10 g / m ² , it is difficult to obtain a uniform texture, and there is a risk of fuzzing. On the other hand, in the region exceeding 150 g / m ² , since the effect of suppressing fuzz hardly changes, the basis weight of the second layer is preferably 150 g / m ² or less, and may be 120 g / m ² or less.

  A sizing agent can be blended in the laminated nonwoven fabric for wallpaper lining of the present invention as required. As the sizing agent, any reinforced rosin sizing agent, rosin emulsion sizing agent, petroleum resin sizing agent, synthetic sizing agent, neutral rosin sizing agent, alkyl ketene dimer (AKD) may be used as long as the desired effect of the present invention is not impaired. Any of known sizing agents such as) can be used.

  In addition, various anionic, nonionic, cationic, or amphoteric yield improvers, drainage agents, dispersants, paper strength improvers that have been used in the past, as long as the desired effects of the present invention are not impaired. And a sticky agent are appropriately selected and used as necessary. In addition, it is also possible to appropriately add internal additives for papermaking such as a pH adjuster, an antifoaming agent, a pitch control agent, and a slime control agent depending on the purpose.

  If necessary, fillers such as clay, kaolin, calcined kaolin, talc, calcium carbonate, titanium dioxide, fillers having self-extinguishing properties such as aluminum hydroxide and magnesium hydroxide, and the like can be blended. In particular, titanium dioxide is useful for enhancing the concealability and opacity so that the wall surface of concrete or gypsum board cannot be seen through. The addition amount of these fillers is 5 to 30% by mass with respect to 100% by mass of the above-mentioned combined non-woven fabric in consideration of concealability, flame retardancy, strength of the nonwoven fabric, and the like.

  The first layer of the laminated nonwoven fabric for wallpaper lining of the present invention is a surface that is adhered to a wall surface such as gypsum board or concrete, and the second layer is a surface that is printed or coated with a foamed polyvinyl chloride resin. It is. The basis weight ratio is not particularly limited, but it is preferable to make the basis weight of the second layer larger than that of the first layer in consideration of providing printability, coating suitability, and volume feeling as wallpaper.

  The method for producing a laminated nonwoven fabric for wallpaper backing in the present invention can be performed, for example, as follows. In the second layer, pulp fibers after being beaten in water, fibrous binders, organic fibers, and sizing agents as necessary are mixed and dispersed, then sent to a storage tank as pulp slurry, and a certain amount of paper is made for the second layer. Send to the machine and make the second layer first to achieve the target basis weight. Next, after mixing and dispersing pulp fibers after being beaten in water, fibrous binder, and sizing agent as necessary, the first layer is sent to a storage tank, and this slurry is made into a certain amount of paper for the first layer. The paper is fed to the machine, and the second layer made in advance is combined so that the target basis weight of the first layer is obtained. Further, after the combined sheet is pressed, it is dried so that the second layer surface is in contact with the Yankee dryer surface, and a combined nonwoven fabric for wallpaper backing can be obtained.

  A pigment can be further added to the surface of the second layer of the laminated nonwoven fabric obtained in the present invention for the purposes of foaming polyvinyl chloride resin, printing sealing, and suppression of fuzz. The pigment can be applied by impregnating or coating the surface of the second layer with a coating liquid containing a pigment and a binder. As the pigment, clay, kaolin, calcined kaolin, talc, calcium carbonate, titanium dioxide or the like that can be added as a filler in the papermaking process can be used. In particular, titanium dioxide is useful for enhancing the concealability and opacity so that the wall surface of concrete or gypsum board cannot be seen through. Moreover, in order to give self-extinguishing property, aluminum hydroxide, magnesium hydroxide, etc. can be used. The proportion of the pigment to be applied is preferably 3 to 50% by mass, more preferably 5 to 40% by mass, and still more preferably 7 to 30% by mass with respect to 100% by mass of the laminated nonwoven fabric for wallpaper backing.

  As a method of applying the pigment, impregnation or coating equipment such as a two-roll size press, a gate roll coater, an air knife coater, a blade coater, a comma coater, a bar coater, a gravure coater, and a kiss coater installed in the middle of the paper making process. However, the present invention is not limited to this. Further, impregnation or coating treatment in an off-machine apparatus is possible after paper making.

  Hereinafter, the present invention will be described in more detail by way of examples. However, the present invention is not limited to these examples. In addition, the number of parts and percentage in an Example are based on mass.

Example 1
NBKP (pulp fiber) beaten to 500 ml CSF in water in a pulper dispersion tank, core-sheath fibrous binder (trade name: Melty 4080, manufactured by Unitika, 2.2 decitex x 5 mm), organic fiber (made by Teijin, polyester fiber) 1.7 decitex × 5 mm) at a ratio of 85: 10: 5 and mixed and dispersed for 10 minutes, then sent to the first storage tank and sent to the first papermaking head by a certain amount for the second layer. The second layer was made in advance so that the amount was 70 g / m ² .

NBKP (pulp fiber) beaten in 500 ml CSF and core-sheath fibrous binder (trade name: Melty 4080, manufactured by Unitika Ltd., 2.2 decitex x 5 mm) in a ratio of 97: 3 Then, after being mixed and dispersed for 10 minutes, it is sent to the second storage tank, and sent to the second paper making head by a certain amount for the first layer, and is made to have a basis weight of 30 g / m ² . The second layer and the first layer, which have been made in advance, are subjected to pressing in the wet paper state, and then pressed so that the surface of the second layer is in contact with the Yankee dryer surface, and the resulting nonwoven fabric is 100 g / m ^{2 in} basis weight. Got.

Example 2
A combined nonwoven fabric of Example 2 was obtained in the same manner as in Example 1 except that the pulp fibers and the core-sheath fibrous binder of Example 1 were changed to a ratio of 90:10.

Example 3
A combined nonwoven fabric of Example 3 was obtained in the same manner as in Example 1 except that the ratio of the pulp fiber and the core-sheath fibrous binder in Example 1 to 70:30 was changed.

Example 4
A combined nonwoven fabric of Example 4 was obtained in the same manner as in Example 1 except that the pulp fiber and the core-sheath fibrous binder of Example 1 were changed to a ratio of 50:50.

Example 5
A combined nonwoven fabric of Example 5 was obtained in the same manner as in Example 1 except that the pulp fibers and the core-sheath fibrous binder of Example 1 were changed to a ratio of 40:60.

(Comparative Example 1)
A laminated nonwoven fabric of Comparative Example 1 was obtained in the same manner as in Example 1 except that the pulp fibers and the core-sheath fibrous binder of Example 1 were changed to a ratio of 100: 0.

(Comparative Example 2)
Instead of the core-sheath fibrous binder of the first layer in Example 1, polyester fibers (1.7 decitex × 5 mm, organic fibers) manufactured by Teijin Ltd. were used, and the pulp fibers and organic fibers were changed to a ratio of 90:10. A non-woven fabric of Comparative Example 2 was obtained in the same manner as Example 1 except that.

Example 6
NBKP (pulp fiber) beaten to 500 ml CSF in water in a pulper dispersion tank, core-sheath fibrous binder (trade name: Melty 4080, manufactured by Unitika, 2.2 decitex x 5 mm), organic fiber (made by Teijin, polyester fiber) 1.7 decitex × 5 mm) and fibrous binder (trade name: VPB107, manufactured by Kuraray Co., Ltd., 1.1 decitex × 3 mm, PVA fiber) are added at a ratio of 89: 3: 5: 3 and mixed and dispersed for 10 minutes. After that, it was sent to the first storage tank and sent to the first papermaking head by a certain amount for the second layer, and the second layer was made first so that the basis weight was 80 g / m ² .

Next, NBKP (pulp fiber) beaten in 500 ml CSF in water in another pulper dispersion tank, core-sheath fibrous binder (trade name: Melty 4080, manufactured by Unitika Ltd., 2.2 decitex × 5 mm) is 80:20 After mixing at a ratio and mixing and dispersing for 10 minutes, the mixture is sent to the second storage tank, sent to the second papermaking head by a certain amount for the first layer, and made to have a basis weight of 20 g / m ² . The second layer and the first layer made in advance are combined in the wet paper state and then pressed, and dried so that the second layer surface is in contact with the Yankee dryer surface, and the combined nonwoven fabric having a basis weight of 100 g / m ² is obtained. Obtained.

Example 7
Example 7 is the same as Example 6 except that the pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber in Example 6 were changed to a ratio of 85: 10: 5: 0. A combined nonwoven fabric was obtained.

Example 8
Example 8 is the same as Example 6 except that the second layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 are changed to a ratio of 80: 10: 5: 5. A combined nonwoven fabric was obtained.

Example 9
Example 9 is the same as Example 6 except that the second-layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 were changed to a ratio of 62: 30: 5: 3. A combined nonwoven fabric was obtained.

Example 10
Example 10 is the same as Example 6 except that the second layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 were changed to a ratio of 85: 0: 5: 10. A combined nonwoven fabric was obtained.

Example 11
Example 11 is the same as Example 6 except that the pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 2 were changed to a ratio of 98: 0: 1: 1. A combined nonwoven fabric was obtained.

Example 12
Example 12 is the same as Example 6 except that the second layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 were changed to a ratio of 96: 0: 2: 2. A combined nonwoven fabric was obtained.

Example 13
Except for changing the second layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 to a ratio of 35: 0: 55: 10, the same as Example 6 was repeated. A combined nonwoven fabric was obtained.

Example 14
In the same manner as in Example 6, except that the pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber in Example 6 were changed to a ratio of 35: 45: 10: 10. A combined nonwoven fabric was obtained.

Example 15
Example 15 is the same as Example 6 except that the second layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 were changed to a ratio of 70: 10: 10: 10. A combined nonwoven fabric was obtained.

(Comparative Example 3)
Comparative Example 3 was the same as Example 6 except that the pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fiber of Example 6 were changed to a ratio of 80: 0: 20: 0. A combined nonwoven fabric was obtained.

Example 16
Titanium dioxide (trade name: W-10, manufactured by Ishihara Sangyo Co., Ltd.) as a pigment, acrylic emulsion (trade name: Boncoat MAT-200-E, manufactured by Dainippon Ink & Chemicals, Inc.) and polyvinyl alcohol (trade name: PVA-) as binders 110, manufactured by Kuraray Co., Ltd.) were each dispersed and mixed in water at a ratio of 100: 20: 5 to prepare a pigment coating solution. This coating solution was applied to the second layer surface of the laminated nonwoven fabric of Example 8 using an air knife coating apparatus and dried at a dry mass of 25 g / m ² to obtain a laminated nonwoven fabric of Example 16.

Example 17
A combined nonwoven fabric of Example 17 was obtained in the same manner as in Example 16 except that the pigment was changed to kaolin (trade name: New Clay, manufactured by Engelhard).

Test 1 (pulp beating degree)
The Canadian standard freeness of the pulp was measured according to JIS P 8121.

Test 2 (dimensional stability)
The combined nonwoven fabric is conditioned at a temperature of 20 ° C. and a humidity of 65% RH for at least 24 hours, and the length (original size) of the sample in the lateral direction is accurately measured. After immersing this sample in water at a temperature of 23 ° C. for 5 minutes, the length of the sample was quickly measured to determine the elongation relative to the original size. The closer to 0, the better the dimensional stability. From the conventional rule of thumb, the elongation is preferably 0.6% or less, and at least 1.0% or less is required. These results are shown in Tables 1-4.

Test 3 (fluffing)
The combined non-woven fabric was conditioned at a temperature of 23 ° C. and a humidity of 50% RH for 24 hours, and then cut so as to be MD direction 32 cm × CD direction 15 cm. When sampling, care was taken not to rub the paper. ^Two high quality papers with a basis weight of 150 g / m ² were laid on a glass plate and fixed with clips. Next, gauze was wrapped around a metal cuboid (weight 400 g) having a width of 250 mm, a length of 130 mm and a thickness of 15 mm, and the fine paper surface was rubbed twice to level the gauze surface. Place the non-woven fabric on the fine paper with the second layer to be the polyvinyl chloride coating surface facing up, once in the MD direction by its own weight in a metal cuboid wrapped with gauze prepared for the second layer surface Rubbed. The direction of the non-woven fabric was changed and rubbed once in the opposite direction. A vinyl chloride paste having a coating thickness of 200 μm was applied to the rubbed area of the laminated nonwoven fabric using an applicator, and placed in a dryer at 145 ° C. for 1 minute to gel the vinyl chloride paste. A 5 cm × 10 cm cut pattern was placed on the center of the gelled polyvinyl chloride layer surface, and the number of protrusions generated therein was counted. As a result, the total (number per 200 cm ² ) of measured values of four samples prepared in the same manner was measured. The number of protrusions measured was evaluated as ◎ when the number was 25 or less, ○ as 26 to 50, △ as 51 to 150, and × as 151 or more. These results are shown in Tables 1-4.

Test 4 (peel characteristics)
Apply a paste solution diluted with water to a concentration of 5% by weight of a powdery paste for methylcellulose wallpaper and stirred sufficiently so that the wet coating amount is 150 g / m ² on the first layer surface of the combined nonwoven fabric. Then, a semi-incombustible gypsum board with a thickness of 12.5 mm (trade name: Tiger Hi-Clean Board, manufactured by Yoshino Gypsum Co., Ltd.) was applied, and after 10 days, a rectangle was cut into a 5 cm wide and 10 cm long rectangle, and then peeled off. The peeled state was observed. ○, which is cleanly peeled between the first layer surface of the gypsum board and the non-woven fabric, △, which is a part of the first layer surface remains on the surface of the gypsum board but is completely peeled, between the layers of the non-woven fabric What peeled or cut | disconnected was evaluated as x. These results are shown in Tables 1-4.

Test 5 (opacity)
The opacity of the laminated nonwoven fabric was measured according to JIS P 8149: 2000, and the concealing property was evaluated. If the non-woven fabric has an opacity of 84% or more, preferably 86% or more, the concealing property is good, and it becomes possible for the wallpaper manufacturer to omit the concealing step. These results are shown in Table 4.

  As is apparent from the results of Tables 1 to 4, the woven fabrics of Examples 1 to 15 of the present invention are all excellent in dimensional stability, fluffing, and peel properties, and can be usefully used for wallpaper backing. Further, Examples 16 and 17 had high opacity because the pigment was applied to the surface of the second layer, and could prevent the see-through of the wall surfaces of gypsum board and concrete. In Comparative Examples 1 and 2, since the fibrous binder was not blended in the first layer in contact with the wall surface, the peel characteristics were poor. Since the comparative example 3 did not mix | blend a fibrous binder with the 2nd layer by the side which provides a surface layer, fuzz was bad.

  The woven fabric of Example 5 had good dimensional stability, fuzziness, and peel characteristics test results, but in Test 4, it was confirmed that the paste solution tends to penetrate when the paste solution is applied. It was. When Example 7 and Example 10 were compared, it was confirmed that Example 10 using PVA fibers as the fibrous binder had a higher fuzz suppression effect.

  Examples of applications of the present invention include wallpaper having good dimensional stability, peel characteristics, and suitable for printing and coating.

Claims (4)

  A laminated nonwoven fabric for wallpaper backing having a two-layer structure, wherein the first layer contains pulp fibers and a fibrous binder, and the second layer contains organic fibers, pulp fibers and a fibrous binder, Fabricated non-woven fabric.   The laminated nonwoven fabric for wallpaper backing according to claim 1, wherein a part or all of the fibrous binder of the second layer is a polyvinyl alcohol fiber.   The woven nonwoven fabric for wallpaper backing according to claim 1, wherein a pigment is applied to the surface of the second layer.   The first layer contains pulp fibers and a fibrous binder, and the second layer is a method for producing a laminated nonwoven fabric for wallpaper backing comprising organic fibers, pulp fibers and a fibrous binder. A method for producing a laminated nonwoven fabric for wallpaper lining, characterized in that after layering and pressing one layer, the surface of the second layer is applied to a Yankee dryer and dried.