JP5829550B2 - Non-woven fabric for wallpaper backing - Google Patents

Description

  The present invention relates to a non-woven fabric for wallpaper backing used as wallpaper backing paper and a method for producing the same.

  Commonly used wallpaper is laminated on the backing paper by a method such as printing, coating, and laminating a decorative layer with a design by printing or embossing on vinyl chloride resin, olefin resin, paper, etc. Is made up of. When the wallpaper is applied to the wall, a water-soluble paste such as starch, vinyl acetate emulsion, or methylcellulose is applied to the back surface or wall surface of the backing paper and attached to the wall surface of gypsum board or concrete.

  Also, in recent years, the living space has been upgraded and diversified, and along with this, there is an increasing demand for wallpaper replacement by renovating existing houses. The problem when renovating is the workability when removing the wallpaper from the wall. Therefore, there is a demand 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 with excellent peel characteristics, it is a wallpaper in which a synthetic resin decorative layer is provided on the wallpaper backing paper, and a coating layer mainly composed of inorganic powder is formed on both sides of the backing paper made mainly of pulp fiber and filler. The provided wallpaper is disclosed (for example, refer patent document 1). In this wallpaper, by providing the covering layer, the synthetic resin decorative layer and the glue do not soak into the backing paper, and the covering layer plays a role as a reinforcing layer, so that the peel characteristics are improved. In addition, a wallpaper-backed paper in which a base paper made of pulp and inorganic pigment is impregnated with a flame retardant and an acrylic emulsion to increase the peel strength of the paper layer is also disclosed (for example, see Patent Document 2). However, with wallpaper backing paper mainly composed of pulp fiber and filler or inorganic pigment, the wallpaper backing paper may expand or contract when coated with glue or when it is dried after being applied to the wall. There was something to do. In addition, the interlaminar strength is insufficient, and when peeling the wallpaper, there is a problem that not only the wallpaper remains randomly on the wall surface, but also the workability is deteriorated, and the finish after the replacement is made uneven. It was.

  For the purpose of providing a wallpaper excellent in peel properties while suppressing expansion and contraction and curling at the time of paste coating and drying, for example, using a wallpaper backing paper that is a mixture of pulp components and synthetic resin components, A wallpaper is disclosed in which the paste is a methylcellulose-based paste, and the interlayer peel strength of the wallpaper backing paper is larger than the peel strength of the wallpaper from the wallpaper (see, for example, Patent Document 3). Further, wallpaper containing pulp fiber and synthetic fiber, wherein the synthetic fiber is a core-sheath fiber made of polyester having a melting point of 200 ° C. or higher and a sheath made of polyethylene having a softening point of 100 ° C. or higher and 150 ° C. or lower or low-melting polyester. A backing paper is disclosed (for example, see Patent Document 4). However, the wallpaper backing paper, which is simply added synthetic fiber to the pulp fiber, is less stretched and curled and has stronger interlayer strength than the wallpaper backing paper mainly composed of pulp fiber and filler and inorganic pigment. The problem that part of the wallpaper remained randomly could not be solved completely. Further, the wallpaper backing paper has a surface on which a decorative layer is provided and a surface to be attached to a wall surface, and the functions required on each surface are naturally different, but the single-layer backing paper described in Patent Documents 1 to 4 is used. However, since the separation of functions is not possible, and only the problem of peeling between the surface to be applied to the wall surface by applying glue and the wall surface is considered, there is a problem with the suitability for printing and coating on the surface on which the decorative layer is provided Was left.

  As a wallpaper backing paper that is curled and stretched and is functionally separated on the surface on which the decorative layer is provided and the surface that is attached to the wall surface, the first layer containing pulp fibers and fibrous binder, organic fibers, and pulp fibers A laminated nonwoven fabric for wallpaper backing, which is composed of a second layer containing a fibrous binder and the first layer is a layer attached to the wall surface, is peeled between the layers of the nonwoven fabric even though it has a two-layer structure Does not occur and is excellent in peel characteristics (see, for example, Patent Document 5). In addition, Patent Document 5 describes that when a polyvinyl alcohol fiber is used as the fibrous binder of the second layer, a smooth surface with less fuzz is obtained and the processability for providing a decorative layer is excellent. Yes. Furthermore, it is also described that the effect of suppressing fuzz and sealing when forming a decorative layer can be obtained by applying a pigment to the surface of the second layer. However, even with the nonwoven fabric for wallpaper backing of Patent Document 5, depending on the conditions for application to the wallpaper, the wallpaper could not be uniformly peeled off at the glue portion, and some wallpaper remained.

JP-A-4-108200 Japanese Patent Laid-Open No. 2003-3400 JP 2005-154968 A JP 2011-208323 A JP 2009-179900 A

  An object of the present invention is to provide a non-woven fabric for wallpaper backing, which has a two-layer structure, but does not peel off between the layers of the non-woven fabric, and further enhances the effect that the wallpaper does not remain on the wall surface when peeling the wallpaper. is there.

The present inventors have conducted research to solve this problem,
(1) In a non-woven fabric for wallpaper backing having a two-layer structure composed of a wallpaper decoration side layer and a wall surface adhering layer, each layer contains pulp fiber, fibrous binder, and organic fiber, and the content of organic fiber and fibrous binder is The content of the non-woven fabric is 18 to 30% by mass, the polyvinyl alcohol fiber is contained only as a fibrous binder on the wallpaper decoration layer side , and the pulp fiber is 70 to 82% by mass in the wallpaper decoration side layer. , 5 to 10% by weight of polyvinyl alcohol fiber as a fibrous binder, 13 to 20% by weight of fibrous binder including the polyvinyl alcohol fiber, 5 to 10% by weight of organic fiber, pulp fibers 70 to 82 wt%, a fibrous binder 9-15 wt%, and also contains an organic fiber 9-15 wt%, inorganic pigment and polymer Both surfaces are coated with a coating layer consisting mainly of Indah, wallpaper backing nonwoven adhesion amount of both surfaces of the coating layer is characterized by a 18.5~25.0g / m ^2,
(2) The nonwoven fabric for wallpaper backing according to (1), wherein the elongation percentage in the CD direction of the nonwoven fabric for wallpaper backing is 0.1 to 0.7% in water immersion at 23 ° C. for 5 minutes ,
(3) The nonwoven fabric for wallpaper backing according to (1) or (2), wherein the opacity of the nonwoven fabric for backing is 86% or more ,
I found.

  The present invention relates to a nonwoven fabric for wallpaper backing used as a backing paper in a wallpaper having a laminated structure of a backing paper and a decorative layer, and peels the wallpaper without peeling between the layers of the nonwoven fabric even though it has a two-layer structure. In particular, it is possible to provide a non-woven fabric for wallpaper backing that further enhances the effect that the wallpaper does not remain on the wall surface.

  Hereinafter, the present invention will be described in detail. The nonwoven fabric for wallpaper backing of the present invention comprises a wallpaper decoration side layer (hereinafter sometimes referred to as “decoration side layer”) and a wall surface affixing layer (hereinafter sometimes referred to as “adhesion layer”) 2 Layer structure. It is affixed to the wall surface by glue applied to the affixing layer of a wall surface made of gypsum board or concrete, or a nonwoven fabric for wallpaper backing. The nonwoven fabric for wallpaper backing of the present invention includes a pulp fiber, a fibrous binder, and an organic fiber in both the decorative side layer and the pasting layer.

  The nonwoven fabric for wallpaper backing 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, linter pulp, kenaf pulp, and herbaceous plants 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. 70-82 mass% is preferable with respect to the total fiber content of each layer, and, as for content of the pulp fiber in each layer, 75-80 mass% is more preferable. When the amount is less than 70% by mass, strength maintenance and dimensional stability as wallpaper are good, but the voids increase and the required amount of glue may increase. On the other hand, if it exceeds 82% by mass, dimensional stability as wallpaper cannot be obtained, and problems such as gaps may occur during construction.

  Unlike the pulp fiber with a flat cross section, the fibrous binder blended in each layer has a perfect circle shape or a shape close to a perfect circle shape, and acts to increase voids by being present between the pulp fibers. At the same time, it has the function of maintaining strength even in a wet state by bonding together pulp fibers having poor water resistance. In this invention, 13-20 mass% is preferable with respect to the total fiber content of a decoration side layer, and, as for content of the fibrous binder mix | blended with a decoration side layer, 15-20 mass% is more preferable. 9-15 mass% is preferable with respect to the total fiber amount of an adhesive layer, and, as for content of the fibrous binder mix | blended with an adhesive layer, 10-15 mass% is more preferable. When the content of the fibrous binder is less than the preferred range, it is difficult to maintain the strength in a wet state, and paper breakage during papermaking becomes a problem. On the other hand, when the preferred range is exceeded, the strength is maintained well, but the paper making becomes difficult due to the cause of peeling failure from the Yankee dryer at the time of paper making drying.

  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 composite fibers such as a core-sheath fiber (core-shell type), a parallel fiber (side-by-side type), and a radially divided fiber, in addition to a single fiber composed of a single component. 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 (full melt type) composed only of a low melting point resin such as polyethylene or a fibrous binder such as polyvinyl alcohol (PVA) fiber can also be used. In particular, the core-sheath fiber is preferred because it has both a void portion and strength development.

  Organic fibers are synthetic fibers other than pulp fibers and fibrous binders. A fiber having a cross-sectional shape close to a perfect circle is preferable to a fiber having a flat cross-sectional shape that can easily fill the void. By blending organic fibers, expansion and contraction in water immersion can be suppressed, and it can contribute to dimensional stability during wallpaper construction. 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. Although the content of the organic fiber in each layer is not particularly limited, the content of the organic fiber blended in the decoration side layer is preferably 5 to 10% by mass with respect to the total fiber amount of the decoration side layer. As for content of the organic fiber mix | blended with an adhesion layer, 9-15 mass% is preferable with respect to the total fiber amount of an adhesion layer. As for content of the organic fiber mix | blended with a base fabric, 9-12 mass% is more preferable with respect to the total amount of base fabric fibers. When the content of the organic fiber is less than the preferred range, the pulp fiber becomes rich and dimensional stability may not be maintained. On the other hand, when the preferable range is exceeded, there may be a problem that peeling from the wall surface becomes too light.

  The fineness of the organic fiber is preferably from 0.1 to 11 dtex, and more preferably from 0.6 to 2.2 dtex. If it is less than 0.1 dtex, the nonwoven fabric may become dense and thin. On the other hand, if it exceeds 2.2 dtex, surface fluff may not be suppressed in the paper making process. 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.

  In the present invention, in addition to pulp fibers, fibrous binders, and organic fibers, inorganic fibers such as metal fibers, glass fibers, rock fibers, and the like can be added to each layer as long as the performance is not impaired. .

  Since the layer surface in the decorative side layer of the nonwoven fabric for wallpaper backing of the present invention is a surface on which foaming polyvinyl chloride resin or the like is applied or printed, the surface of the layer is covered with fiber fluff. Is not preferable, and it is necessary to smooth the surface and to prevent fiber fluffing when drying with a Yankee dryer in the paper making process. Therefore, since the decoration side layer contains the PVA fiber as the fibrous binder, a flat surface with less fuzz is obtained, so that the influence during coating and printing is reduced.

  PVA fiber is a fiber manufactured using PVA raw material, and it hardly dissolves in normal temperature water and keeps the fiber form. However, it dissolves easily when the surface is in contact with the Yankee dryer surface after paper making and heated. At the beginning, by pressing with equipment such as a touch roll at that moment, it becomes a fibrous binder across the fibers, re-solidifies by subsequent dehydration drying, and a smooth surface with less fluff that cannot be obtained with core-sheath fibers alone can get. Moreover, it becomes a strong paper layer constituting fiber which cannot be easily separated unless it is in high temperature water. The content of the PVA fiber in the decorative side layer is not particularly limited, but is preferably 5 to 10% by mass with respect to the total amount of fibers in the decorative side layer, and the organic fiber contained in the decorative side layer It is more preferable that it is contained at a mass ratio equal to or higher than that. When content of PVA is less than 5 mass%, it may become difficult to suppress the fuzz of the surface fiber of a decoration layer. If it exceeds 10% by mass, not only the processing of the decorative layer becomes difficult, but also the strength in the layer is affected, and smooth peeling may not be possible.

  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 becomes too small, the nonwoven fabric may become 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.

  In this invention, content of an organic fiber and a fibrous binder is 18-30 mass% with respect to all the fibers which comprise a nonwoven fabric, and it is more preferable that it is 20-29 mass%. When the content of the organic fiber and the fibrous binder is less than 18% by mass, not only the dimensional stability is deteriorated, but also the problem that the surface quality of the surface of each layer and the peelability cannot be achieved is caused. Moreover, when it exceeds 30 mass%, a problem arises at the time of wallpaper construction because releasability is too good.

  In the present invention, the non-woven fabric for wallpaper backing before the coating layer is provided can be produced by a wet papermaking method. As the paper machine used in the wet papermaking method, for example, a long net paper machine, a circular net paper machine, or an inclined wire type paper machine can be used. These paper machines can be used alone, or a combination paper machine in which two or more of the same or different types of paper machines are installed online may be used. Further, the wallpaper backing nonwoven fabric of the present invention has a two-layer structure, and a paper making method in which wet papers made by each paper machine are laminated, or after forming one sheet, a fiber is formed on the sheet. Can be manufactured by a method such as casting a slurry in which is dispersed, but the delamination is unlikely to occur, and the paper making method is preferable.

  The nonwoven fabric for backing wallpaper can be produced, for example, as follows. The decorative side layer is made by mixing and dispersing pulp fiber, fibrous binder, organic fiber, and sizing agent if necessary, and then sending it to the storage tank as a pulp slurry and sending it to the paper machine by a certain amount for the decorative side layer. The decorative side layer is made first so as to have a basis weight of. Next, the affixing layer is prepared by mixing and dispersing pulp fibers, fibrous binder, and sizing agent as necessary, and then sending it to a storage tank, and sending this slurry to the paper machine by a certain amount for the affixing layer. The decorative side layer is made into a sheet so that the target basis weight of the affixing layer is obtained. Further, after the combined sheet is pressed, it is dried so that the decorative side layer surface is in contact with the Yankee dryer surface, and it can be used as a nonwoven fabric for wallpaper backing.

  A sizing agent can be blended with the nonwoven fabric for backing the wallpaper 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.

  The coating layer in the nonwoven fabric for wallpaper backing of the present invention mainly comprises an inorganic pigment and a polymer binder. As the inorganic pigment, inorganic pigments having good water dispersibility such as clay, kaolin, calcined kaolin, calcium carbonate, talc, titanium dioxide and the like can be used. However, titanium dioxide is useful when emphasis is placed on opacity, which is one of the characteristics of wallpaper. Moreover, 60-70 mass% is preferable and, as for content of the inorganic pigment in a coating layer, 65-70 mass% is more preferable. If it is less than 60% by mass, the adhesion amount may not be applied and the opacity may be lowered. On the other hand, if it exceeds 70% by mass, there is a risk of powder dispersion in post-processing due to poor dispersion of the pigment and a decrease in the polymer binder used.

  The nonwoven fabric for wallpaper backing of the present invention is coated on both sides with a coating layer. For example, when only the decorative side layer is covered with the covering layer, a peeling failure may occur in the pasting layer. On the other hand, when only the affixing layer is covered with the covering layer, a problem may occur in the design due to fluffing or surface irregularities during decoration processing.

  The polymer binder contained in the coating layer should be a vinyl chloride copolymer, vinyl acetate copolymer, acrylic resin, styrene / butadiene / rubber, or methacrylate / butadiene / rubber. Can do. These binders are preferably emulsions. When the wallpaper backing nonwoven fabric of the present invention is processed into wallpaper, a vinyl chloride copolymer is often used as a decorative layer, and heat of 200 ° C. or higher is applied during drying. It is effective to use acrylic resin with high heat resistance. 20-30 mass% is preferable and, as for content of the polymer binder in a coating layer, 20-25 mass% is more preferable. If it is less than 20% by mass, the inorganic pigment may be powdered off. If it exceeds 30% by mass, the ratio of the inorganic pigment may be lowered and the opacity may not be satisfied. May affect.

  Furthermore, in order to increase the liquid stability in the coating liquid of the coating layer, there is no problem even if an auxiliary agent such as a water retention agent or a thickener is added. For example, a polyvinyl alcohol resin can be added to the coating layer coating solution to provide a thickening and water retention effect. 5-10 mass% is preferable and, as for the compounding quantity of the adjuvant in a coating layer, 5-7 mass% is more preferable. If the amount is less than 5% by mass, water retention and thickening effects may not be obtained. If the amount exceeds 10% by mass, the concentration of the coating liquid becomes thin, and it becomes difficult to obtain the target adhesion amount.

In this invention, the adhesion amount of a coating layer is 18.5-25.0 g / m < ² > by the total solid content mass of both surfaces, It is characterized by the above-mentioned. If the adhesion amount is less than 18.5 g / m ² , the target opacity cannot be obtained, and if it exceeds 25.0 g / m ² , peeling from the wall surface is too light, and the wallpaper turns over during construction. May occur.

  As a method for providing a coating layer, 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.

  In the nonwoven fabric for wallpaper backing of the present invention, the delamination hardly occurs when both the decorative side layer and the affixing layer contain organic fibers. In addition, by covering the surface of the adhesive layer containing organic fibers with a coating layer, when peeling the wallpaper, it becomes easy to peel off at the glue part. For example, when the adhesive strength of the glue is high or the wallpaper is sunlight or heat Even if it is a case where it deteriorates by, the effect that it is easy to peel a wallpaper in a glue part, without peeling between layers is acquired.

Although the basic weight of the nonwoven fabric for wallpaper backing of this invention is not specifically limited, 30 g / m < ² > or more is preferable and 60 g / m < ² > or more is more preferable. If it is less than 30 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 effect of suppressing curling or sheet break, since the basis weight remained almost unchanged in the region beyond 200 g / ^{m 2,} the basis weight is preferably 200 g / ^{m 2} or less, may be 150 g / ^{m 2} or less.

The basis weight of the decorative side layer is preferably 20 g / m ² or more, and more preferably 35 g / m ² or more. When it is less than 20 g / m ² , it is difficult to obtain a uniform texture, and there is a possibility that surface fuzz after drying may occur. In the two-ply laminating method in the wet papermaking method, if the basis weight of the decorative side layer is too heavy, the stability during papermaking is impaired, so the basis weight is preferably 100 g / m ² or less. Further, in a region beyond 100 g / m ^2, from the fact that the effect of suppressing fuzz hardly changes, the basis weight of the decorative side layer is preferably set to 100 g / m ² or less.

The basis weight of the adhesive layer is preferably 10 g / m ² or more, and more preferably 20 g / m ² or more. If it is less than 10 g / m ² , it is difficult to obtain a uniform texture, and the glue may reach the decorative side 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 adhesive layer is preferably 100 g / m ² or less, and 80 g / m ^2. It is good also as follows.

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

  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 (registered trademark) 4080, manufactured by Unitika Ltd., 2.2 decitex x 5 mm), organic fiber (Teijin) Fiber Co., Ltd., polyester fiber, 0.6 decitex × 5 mm), PVA fibrous binder (trade name: VPB107, Kuraray Co., Ltd., 1.0 decitex × 3 mm) is added at a ratio of 75: 10: 5: 10 Then, after mixing and dispersing for 10 minutes, it was sent to a storage tank, and the decorative side layer was made from the paper making head tank under the making conditions such that the basis weight was 40 g / m ² . As for the beating degree of the pulp, a Canadian standard freeness according to JIS P 8121 was measured.

NBKP (pulp fiber) beaten to 500 ml CSF in water in another pulper dispersion tank, core-sheath fiber binder (trade name: Melty 4080, manufactured by Unitika Ltd., 2.2 decitex x 5 mm), organic fiber (Teijin Fibers Ltd.) Company polyester fiber, 0.6 decitex x 5 mm) is added at a ratio of 72:14:14, mixed and dispersed for 10 minutes, and then sent to the storage tank so that the basis weight is 25 g / m ² from the papermaking head tank. Under different papermaking conditions, the pasting layer is made on the back side of the decorative side layer, and a wet paper nonwoven fabric is made. It pressed in the state of the wet paper put together, it dried so that the surface of a decoration side layer might hit a Yankee dryer, and the nonwoven fabric base material for wallpaper backings with a basic weight of 65 g / m < ² > was obtained.

As an inorganic pigment, titanium dioxide (trade name: TITON (registered trademark) R-25 manufactured by Sakai Chemical Industry Co., Ltd.), as a polymer emulsion, an acrylic emulsion (trade name: Polytron (registered trademark) Z431 manufactured by Asahi Kasei Chemicals Corporation) and Polyvinyl alcohol (trade name: PVA-117, manufactured by Kuraray Co., Ltd.) was dispersed and mixed in water at a ratio of 70: 25: 5 to prepare a coating solution. The present coating liquid in the impregnation device, impregnated with dry mass 20 g / m ² on the wallpaper backing nonwoven raw fabric, to obtain a dry basis weight of 85 g / m ² of wallpaper backing nonwoven.

Example 2
Example 2 in the same manner as in Example 1 except that the decorative side layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fibrous binder of Example 1 were changed to a ratio of 70: 10: 10: 10. A non-woven fabric for wallpaper lining was obtained.

Example 3
The pulp fiber, the core-sheath fibrous binder, the organic fiber, and the PVA fibrous binder in the decorative side layer of Example 1 in the ratio of 80: 10: 5: 5, the pulp fiber, the core-sheath fibrous binder, the organic A wallpaper backing nonwoven fabric of Example 3 was obtained in the same manner as in Example 1 except that the fiber ratio was changed to a ratio of 80:10:10.

Comparative Example 1
The pulp fiber, the core-sheath fibrous binder, the organic fiber, and the PVA fibrous binder in the decorative side layer of Example 1 in the ratio of 80: 10: 10: 0, and the pulp fiber, the core-sheath fibrous binder, the organic A wallpaper backing nonwoven fabric of Comparative Example 1 was obtained in the same manner as in Example 1 except that the fiber ratio was changed to 80:10:10.

Comparative Example 2
The pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fibrous binder in the decorative side layer of Example 1 are in a ratio of 70: 15: 15: 0, and the pulp fiber, core-sheath fibrous binder, organic in the affixing layer A wallpaper backing nonwoven fabric of Comparative Example 2 was obtained in the same manner as in Example 1 except that the fiber ratio was changed to a ratio of 70:15:15.

Comparative Example 3
Comparative Example 3 in the same manner as in Example 1 except that the decorative side layer pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fibrous binder of Example 1 were changed to a ratio of 65: 15: 10: 10. A non-woven fabric for wallpaper lining was obtained.

Comparative Example 4
The pulp fiber, core-sheath fibrous binder, organic fiber, and PVA fibrous binder in the decorative side layer of Example 1 in a ratio of 85: 5: 5: 5, the pulp fiber, core-sheath fibrous binder, organic in the affixing layer A wallpaper backing nonwoven fabric of Comparative Example 4 was obtained in the same manner as in Example 1 except that the fiber ratio was changed to 80:10:10.

Example 4
A non-woven fabric for wallpaper backing of Example 4 was obtained in the same manner as Example 1 except that the impregnation dry mass by the impregnation apparatus of Example 1 was changed to 25.0 g / m ² .

Example 5
A nonwoven fabric for wallpaper backing of Example 5 was obtained in the same manner as in Example 1 except that the impregnation dry mass by the impregnation apparatus of Example 1 was changed to 18.5 g / m ² .

Comparative Example 5
A wallpaper backing nonwoven fabric of Comparative Example 5 was obtained in the same manner as in Example 1 except that the impregnation dry mass by the impregnation apparatus of Example 1 was changed to 18.0 g / m ² .

Comparative Example 6
A wallpaper backing nonwoven fabric of Comparative Example 6 was obtained in the same manner as in Example 1 except that the impregnation dry mass by the impregnation apparatus of Example 1 was changed to 30.0 g / m ² .

Example 6
A nonwoven fabric for wallpaper backing of Example 6 was obtained in the same manner as in Example 1 except that instead of titanium of Example 1, calcium carbonate (trade name: TP-123, manufactured by Okutama Kogyo Co., Ltd.) was used.

Example 7
A non-fired kaolin (trade name: manufactured by NUCLAY BASF CORPORATION) was used instead of titanium in Example 1, and a nonwoven fabric for wallpaper backing of Example 7 was obtained in the same manner as in Example 1.

Comparative Example 7
A wallpaper backing nonwoven fabric of Comparative Example 7 was obtained in the same manner as in Example 1 except that the impregnation apparatus of Example 1 was changed to a surface coating apparatus and only the decoration side layer surface was applied.

Comparative Example 8
A wallpaper backing nonwoven fabric of Comparative Example 8 was obtained in the same manner as in Example 1 except that the impregnation apparatus of Example 1 was changed to a surface coating apparatus and changed to the application of only the adhesive layer surface.

Comparative Example 9
A wallpaper backing nonwoven fabric of Comparative Example 9 is obtained in the same manner as in Example 1 except that the pulp fiber, core-sheath fibrous binder, and organic fiber in the attachment layer of Example 1 are changed to a ratio of 80: 20: 0. It was.

Comparative Example 10
The pulp fiber, core-sheath fibrous binder, and organic fiber in the affixing layer of Example 1 were changed to a ratio of 80: 20: 0, the impregnation device was changed to a surface coating device, and the coating was changed only to the decoration side layer. Except for the above, a wallpaper backing nonwoven fabric of Comparative Example 10 was obtained in the same manner as in Example 1.

Comparative Example 11
The pulp fiber, core-sheath fibrous binder, and organic fiber in Example 1 were changed to a ratio of 80: 20: 0, the impregnation device was changed to a surface coating device, and the coating was changed to only the application layer side. A wallpaper backing nonwoven fabric of Comparative Example 11 was obtained in the same manner as in Example 1 except that.

  The following test was implemented with respect to the nonwoven fabric for wallpaper backing of an Example and a comparative example, and the result was shown to Tables 1-4.

Test 1 (opacity)
The opacity of the nonwoven fabric for wallpaper backing was measured according to JIS P 8149: 2000, and the hiding property was evaluated. If the non-woven fabric for wallpaper backing has an opacity of 84% or more, preferably 86% or more, the concealing property is good, and it becomes possible for the wallpaper maker to omit the concealing step again.

Test 2 (Blowing)
In the manufacturing of non-woven fabric for wallpaper backing, when the wet paper web is pressed with a touch roll in the process of pressing the wet paper web weaved together and drying with a Yankee dryer, Wrinkles develop. The air reservoir at this time is generally expressed as blowing. The expression of wrinkles by this blowing was evaluated according to the following degree.
“×” blowing occurred and wrinkles were seen on the paper.
“Δ” blowing occurs but no wrinkles are seen.
“○” blowing is not seen.

Test 3 (fluffing)
After conditioned the non-woven fabric for wallpaper lining in a 23 ° C. and 50% RH environment for 24 hours, it is cut so that the MD direction (papermaking flow direction, vertical direction) is 32 cm × CD direction (transverse direction, width direction) is 15 cm. did. When sampling, care was taken not to rub the paper. ^Two high quality papers having 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. A non-woven fabric for wallpaper backing was placed on a high-quality paper with the decoration side layer facing up, and was rubbed once in the MD direction by its own weight with a metal cuboid wrapped with gauze prepared for the surface of the decoration side layer. The direction of the non-woven fabric for wallpaper backing was changed, and the surface was rubbed once in the opposite direction, and the surface area of 5 cm × 10 cm in the center was visually observed and evaluated according to the following degree.
“◎” The number of fluff is 0 “○” The number of fluff is less than 5 “△” The number of fluff is 5 or more and less than 10 “×” The number of fluff is 10 or more

Test 4 (Peelability from wall surface)
Apply a paste solution that has been diluted with water to a concentration of 5% by weight of the methylcellulose-based wallpaper paste and sufficiently stirred so that the wet coating amount is 150 g / m ² on the surface of the wallpaper backing nonwoven fabric. And pasted it on a semi-incombustible gypsum board with 12.5mm thickness (trade name: Tiger Hi-Clean Board, manufactured by Yoshino Gypsum Co., Ltd.), and after 10 days, cut a rectangle into a rectangle with a width of 5cm and a length of 10cm. It peeled off with a testing machine (trade name: RTC-1150, manufactured by Kumagai Riki Kogyo Co., Ltd.) at a constant speed of 50 m / min and a constant load of 40 N, and the peeled state was observed and evaluated according to the following degree. The peelability varies greatly depending on the peeling speed and force, and was measured by introducing a tensile tester.
"○" It was able to peel off cleanly between the plaster board and the pasting layer surface.
“Δ” A small amount of the layer surface was left on the surface of the gypsum board, but the entire surface was peeled off.
“×” The film was peeled or cut between the layers of the nonwoven fabric for backing the wallpaper.

Test 5 (dimensional stability)
The wallpaper backing nonwoven fabric is conditioned for 24 hours or more in an environment of temperature 20 ° C. and humidity 65% RH, 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 0.0%, the better the dimensional stability. From the conventional rule of thumb, the elongation is preferably within 0.4%, and at least 0.7% is required.

  As is clear from the results of Tables 1 to 4, the wallpaper backing nonwoven fabrics of Examples 1 to 5 of the present invention are used as wallpaper backing nonwoven fabrics excellent in dimensional stability, opacity, fluffing, and peelability from the wall surface. Can be used.

  From Examples 1 to 3 and Comparative Examples 1 to 4, the content of the organic fiber and the fibrous binder is 18 to 30% by mass with respect to the total fibers constituting the nonwoven fabric, and the fibrous binder on the wallpaper decoration layer side In Examples 1 to 3 containing polyvinyl alcohol fiber as a result, there was no generation of wrinkles due to blowing, opacity, dimensional stability, good peelability from the wall surface, and no fluffing. In Comparative Example 1, the decorative side layer did not contain PVA fibers as a fibrous binder, so wrinkles due to blowing occurred, and there were many fluffs, and when peeling from the wall surface, the wallpaper backing nonwoven fabric remained on the wall surface. . In Comparative Example 2, the decorative side layer did not contain PVA fibers as a fibrous binder, and thus fuzz occurred. In Comparative Example 3, since the content of the organic fiber and the fibrous binder exceeded 30% by mass, wrinkles due to blowing occurred, and when peeling from the wall surface, the wallpaper backing nonwoven fabric remained on the wall surface. In Comparative Example 4, since the content of the organic fiber and the fibrous binder is less than 18 mass, wrinkles due to blowing occur, and when peeling from the wall surface, delamination between the decorative side layer and the pasting layer Occurred.

From Examples 1, 4, 5 and Comparative Examples 5 and 6, when the adhesion amount on both sides of the coating layer is less than 18.5 g / m ² , the opacity is low, and a small amount of nonwoven fabric is peeled off from the wall surface. The result remained on the wall surface (Comparative Example 5). When the adhesion amount on both sides of the coating layer is more than 25.0 g / m ² , the opacity is increased, but the operability is affected, and when peeling from the wall surface, the wallpaper backing nonwoven fabric remains on the wall surface. It was. By making the adhesion amount of the coating layer an appropriate value, it is possible to improve the peelability from the wall surface.

  From the comparison of Examples 1, 6, and 7, it was found that the opacity was changed by changing the inorganic pigment in the coating layer, and a good result was obtained when titanium dioxide was used.

  From Example 1 and Comparative Examples 7 and 8, by changing the double-sided coating on the impregnation device to surface coating on each side, opacity can be obtained, but the uncoated surface side has poor peelability and surface As a result, fuzzing occurred.

  In the case where the organic fibers of the pasting layer were removed from Example 1 and Comparative Examples 7, 8, 9, 10, and 11, when peeling from the wall surface, delamination and removal of the paper layer occurred. became.

  Examples of the use of the present invention include wallpaper having dimensional stability and good peeling or peeling off from the wall surface and coating suitability.

Claims (3)

In the nonwoven fabric for wallpaper backing of the two-layer structure consisting of the wallpaper decoration side layer and the wall surface adhering layer, each layer contains pulp fiber, fibrous binder, and organic fiber, and the organic fiber and fibrous binder content is nonwoven fabric. It is 18-30 mass% with respect to all the fibers which comprise, and contains polyvinyl alcohol fiber only as a fibrous binder by the side of a wallpaper decoration layer, 70-82 mass% of pulp fibers in a wallpaper decoration side layer, fibrous form 5 to 10% by mass of polyvinyl alcohol fiber as a binder, 13 to 20% by mass of fibrous binder including the polyvinyl alcohol fiber, 5 to 10% by mass of organic fiber, 70 to 82 wt%, a fibrous binder 9-15 wt%, and also contains an organic fiber 9-15 wt%, inorganic pigment and polymer Vine Both surfaces are coated with a coating layer mainly composed of over wallpaper backing nonwoven adhesion amount of both surfaces of the coating layer is characterized by a 18.5~25.0g / m ^2. The nonwoven fabric for wallpaper backing according to claim 1, wherein the elongation percentage in the CD direction of the nonwoven fabric for wallpaper backing is 0.1 to 0.7% when immersed in water at 23 ° C for 5 minutes. The nonwoven fabric for wallpaper backing according to claim 1 or 2, wherein the opacity of the nonwoven fabric for backing is 86% or more.