JP2015180784A - backing paper for wallpaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide backing paper for wallpaper which does not cause stains of a drier in a papermaking step or a drying step, is excellent in dimensional stability at the time of application of wallpaper, and is excellent in peeling suitability in peeling wallpaper from a wall surface.SOLUTION: Backing paper for wallpaper contains at least fiber formed of pulp fiber and synthetic fiber, and a filler. The backing paper contains polyester fiber having such a sheath-core structure that a melting point of a core part is 200°C or higher and a melting point of a sheath part is 150°C or higher as the synthetic fiber at a ratio of 5-30 mass% in the total solid content of the fiber, and contains kaolin as the filler at a ratio of 3-20 mass% in the total solid content of the backing paper for the wallpaper.

Description

  The present invention relates to a backing paper for wallpaper used for foamed wallpaper and the like, and in particular, there is no dryer stain in the paper making process or drying process, and it has excellent dimensional stability at the time of wallpaper construction and excellent peelability when peeling the wallpaper from the wall surface. Related to backing paper.

  Foamed wallpaper such as vinyl foamed wallpaper, paper foamed wallpaper, and olefin foamed wallpaper is mainly composed of a two-layer structure of an upper layer that imparts designability and a backing paper that supports the upper layer and imparts workability. These foamed wallpaper is pasted on the wall with water-based glue such as starch or vinyl acetate at the time of construction, but the water in the glue is absorbed by the backing paper in this gluing process, and the foamed wallpaper becomes soft or lining. Paper may stretch due to increased moisture. Due to this, there have been problems such as the occurrence of curling, the sticking work of foamed wallpaper on the wall surface becoming difficult, and the wallpaper becoming sticky after sticking. In addition, when the glue dries, the backing paper shrinks, and when performing sticking with good construction productivity, there is a problem (gap) that creates a gap in the joint portion between adjacent bonded wallpapers. There were drawbacks such as impaired designability.

  For this reason, the backing paper made by making the drying part of the paper making process dry with a so-called Yankee dryer is used as the backing paper for foamed wallpaper which is difficult to curl even when glued and the dimensional stability is improved. (See Patent Document 1 and Patent Document 2).

  In addition, a backing paper has been proposed that has less fluffing of the backing paper, excellent printability, and good peelability when peeling wallpaper from a wall surface (see Patent Document 3). However, in these inventions, in addition to the peelability at the time of peeling the wallpaper from the wall surface, no consideration is given to a technique that simultaneously satisfies wet tensile strength, dimensional stability in water, and curl, and the above characteristics are insufficient. Met.

  Also, it is difficult to curl even when glue is applied at the time of construction, it does not cause opening after sticking, it is easy to peel off at the time of sticking, and the backing paper layer remaining on the wall after peeling is uniform Paper has been proposed (see Patent Document 4). Furthermore, a wallpaper backing paper has been proposed that generates less fuzz during the coating of vinyl chloride paste or the like, or during the subsequent drying process, and that does not cause opening after wallpaper construction (see Patent Document 5). However, in these inventions, when the melting point of the core-sheath fiber is low, there is a concern about dryer stains in the paper making process or the drying process. In addition, the calorific value of polyethylene fiber is higher than that of natural fiber or polyester fiber, the calorie value after wallpaper processing is increased, and the flame retardancy is insufficient.

JP 2005-82894 A JP 2007-92223 A JP 2009-242982 A Japanese Patent Laid-Open No. 2007-077526 JP 2010-229604 A

  The present invention relates to a backing paper for wallpaper, and provides a backing paper for wallpaper that is free from dryer stains in the paper making process or the drying process, has excellent dimensional stability at the time of wallpaper construction, and has excellent peelability when peeling the wallpaper from the wall surface. The main purpose.

  As a result of intensive studies in view of the above-described conventional technology, the present inventors have solved the above-described problems. That is, the present invention relates to the following thermal recording material.

  Item 1: A wallpaper backing paper containing at least pulp fibers and synthetic fibers and a filler, wherein the core has a melting point of 200 ° C. or more and a melting point of the sheath is 150 ° C. or more as a synthetic fiber Polyester fibers having a mold structure are contained in a proportion of 5 to 30% by mass in the solid amount of all fibers, and kaolin is contained as a filler in a proportion of 3 to 20% by mass in the total solid amount of the backing paper for wallpaper. Lined paper for wallpaper.

  Item 2: The backing paper for wallpaper according to item 1, wherein the melting point of the sheath of the polyester fiber is lower than the melting point of the core.

  Item 3: The wallpaper backing paper according to Item 1 or 2, wherein the melting point of the sheath of the polyester fiber is lower than the melting point of the core, and the difference between the melting points of the sheath and the core is 40 to 120 ° C.

  Item 4: The backing paper for wallpaper according to any one of Items 1 to 3, wherein a melting point of the sheath of the polyester fiber is 180 ° C or higher.

  Item 5: The wallpaper backing paper according to any one of Items 1 to 4, wherein the polyester fiber has a fiber length of 3 to 7 mm.

Item 6: The backing paper for wallpaper according to any one of Items 1 to 5, wherein the basis weight is 40 to 150 g / m ² .

  The wallpaper backing paper of the present invention is free from dryer stains in the paper making process or the drying process, is excellent in dimensional stability during wallpaper construction, and is excellent in peelability when peeling the wallpaper from the wall surface.

  The backing paper for wallpaper of the present invention (hereinafter also simply referred to as backing paper) contains at least fibers composed of pulp fibers and synthetic fibers, and a filler. Specific examples of the pulp fiber include, for example, bleached kraft pulp (NBKP) of softwood, bleached kraft pulp (LBKP) of hardwood, groundwood (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP). And natural pulp such as wood pulp such as deinked pulp (DIP), non-wood pulp such as bast pulp, linter pulp and hemp pulp. These pulp fibers can be used singly or in combination of two or more. Especially, it is preferable to use wood pulp from the surface of quality or cost.

  For paper backing paper, wet paper strength agents, sizing agents, fillers, yield improvers, fixing agents, dry paper strength agents, dyes, pigments, etc. are used as internal additives within a range that does not affect the quality. be able to. Furthermore, surface paper strength agents, dyes, pigments and the like can be used as external chemicals to be applied or impregnated with a size press or the like.

  In the present invention, the wet paper strength agent is preferably contained at a ratio of 0.5 to 3.0% by mass in the total solid content of the backing paper for wallpaper. As for a content rate, 0.7-2.5 mass% is more preferable, and 0.8-2.0 mass% is still more preferable. By setting the content ratio of the wet paper strength agent to 0.5% by mass or more, it is possible to effectively suppress a decrease in underwater dimensional stability and curl and improve workability when attaching wallpaper. On the other hand, if it exceeds 3.0% by mass, the effect on dimensional stability in water will reach its peak, and by setting it to 3.0% by mass or less, the cost can be reduced and the effect of improving the disaggregation property of the waste paper can be obtained. It is done.

  Specific examples of the wet paper strength agent include polyamide-epichlorohydrin, polyamine-epichlorohydrin, epoxy resin, melamine resin, and the like. In particular, it is preferable to use polyamide-epichlorohydrin or polyamine-epichlorohydrin.

  In the present invention, a sizing agent can be used as necessary. The sizing agent may be added internally or externally. Examples of the sizing agent to be used include rosin sizing agent, rosin emulsion sizing agent, α-carboxymethyl saturated fatty acid, alkyl ketene dimer, alkenyl succinic anhydride, and cationic polymer sizing agent. Among these, rosin sizing agents are preferable. The content is not particularly limited, but is preferably 0.5% by mass or less, more preferably 0.4% by mass or less, based on the total solid content of the wallpaper backing paper, from the viewpoint of reducing the possibility of occurrence of dirt in the papermaking system. Preferably, 0.3 mass% or less is more preferable. A sulfate band (aluminum sulfate) can be used as a fixing agent for the rosin sizing agent.

  The wallpaper backing paper of the present invention contains kaolin as a filler in a proportion of 3 to 20% by mass in the total solid content of the wallpaper backing paper. The content ratio is preferably 3 to 18% by mass, and more preferably 3 to 17% by mass. When the content ratio of kaolin is less than 3% by mass, the opacity becomes insufficient, and the peelability when peeling the wallpaper from the wall surface at the time of replacement becomes insufficient. On the other hand, if it exceeds 20% by mass, the tensile strength becomes insufficient. Other than these, delaminated kaolin, heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica composite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, water You may use together inorganic fillers, such as aluminum oxide, calcium hydroxide, magnesium hydroxide, and zinc hydroxide, and organic fillers, such as urea-formalin resin, a styrene resin, and a phenol resin, in the range which does not inhibit a desired effect.

  By the way, as a characteristic required for wallpaper, when peeling the wallpaper at the time of replacement, the space between the backing paper for wallpaper is uniformly broken, in other words, it is constant in the thickness direction of the paper layer forming the backing paper for wallpaper. It is important not to make the wall surface uneven by causing cohesive failure. In the present invention, by containing a flat kaolin as a filler for wallpaper backing paper, the inter-paper strength of the wallpaper backing paper can be reduced with a small amount of addition, and when peeling the wallpaper, it can be peeled uniformly. Can do.

  In the present invention, as a yield improver, for example, a polyacrylamide compound, a polyethylene glycol compound, a polyvinylamine compound, or the like can be contained. Among these, cationic polyacrylamide compounds are particularly preferable. When kaolin is used as the filler, the overall yield is likely to decrease, and therefore an appropriate retention agent may be selected as appropriate in order to improve productivity. Although the content rate of a yield improving agent is not specifically limited, 0.001-0.035 mass% is preferable, 0.005-0.030 mass% is more preferable, 0.008-0.020 mass% is still more preferable .

  In the present invention, it is preferable to adjust the freeness (Canadian standard freeness) measured according to JIS P 8121-2012 of the pulp fiber to be used to 400 to 600 ml. The freeness of the pulp may be adjusted to the above range by beating at least one kind of pulp. When two or more kinds of pulp are used, the pulp beaten separately may be mixed to the above range, or the previously mixed pulp may be beaten and adjusted to the above range. By setting the freeness of the pulp to 400 ml or more, the elongation at the time of constructing the wallpaper using the aqueous paste can be effectively reduced. Moreover, since the shrinkage | contraction at the time of drying can also be made small, the opening (gap) of the wallpaper stuck next to each other can be made still smaller, and it is preferable. On the other hand, by setting it to 600 ml or less, paper strength can be increased, wet strength can be improved, and fluffing of the paper substrate can be suppressed.

  The wallpaper backing paper of the present invention is a polyester fiber having a core-sheath structure (hereinafter also referred to as a specific polyester fiber) having a melting point of a core part of 200 ° C. or more and a melting point of a sheath part of 150 ° C. or more as a synthetic fiber. It contains in the ratio of 5-30 mass% in solid content of all the fibers. The content ratio is preferably 7 to 25% by mass, and more preferably 8 to 20% by mass. When the content of the specific polyester fiber is less than 5% by mass, the dimensional stability becomes insufficient. On the other hand, if it exceeds 30% by mass, the dimensional stability is improved, but the tensile strength becomes insufficient.

  When the melting point of the polyester fiber having a core-sheath structure is less than 150 ° C., dryer stains due to the resin component of the material used for the backing paper for wallpaper are remarkably generated in the paper making process or the drying process. The melting point of the sheath is preferably 180 ° C. or higher. On the other hand, if the melting point of the core is lower than 200 ° C., there is a risk of softening / melting with respect to the thermal history of the drying process or the like, and the desired dimensional stability cannot be obtained.

  The specific polyester fiber in the present invention has a very low water absorption as compared with pulp, and volume swelling in the presence of water hardly occurs. The presence of such polyester fibers in the paper layer is considered to reduce the swelling inside the paper layer, and as a result, improve the underwater dimensional stability of the paper. In addition, in the present invention, by having a core-sheath structure, it melts by heat in the drying process and expresses mild adhesiveness, so that it adheres to pulp fibers during the paper making process, or between polyester fibers Adhesion or formation of many water-insoluble adhesion points is considered to provide a wallpaper backing paper having excellent underwater dimensional stability.

  The specific polyester fiber in the present invention is a fiber made of a polyester homopolymer or copolymer. Specific examples of such polyester include polyesters such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polylactic acid, and stereocomplex polylactic acid, and copolymerized polyester obtained by copolymerizing a third component. Among these, polyethylene terephthalate is preferable from the viewpoint of being easily available industrially and enhancing dimensional stability and adhesiveness. Moreover, it may be polyethylene terephthalate formed by using a material component or a chemically recycled polyester or a monomer component obtained by using a biomass, that is, a biological material described in JP 2009-091694 A as a raw material. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-21268 may be sufficient. In the polymer, a fine pore forming agent, a cationic dye dyeing agent, an anti-coloring agent, a thermal stabilizer, a fluorescent whitening agent, a matting agent, a coloring agent are added as necessary within the range not impairing the object of the present invention. In addition, one or more hygroscopic agents and inorganic fine particles may be contained.

  As the specific polyester fiber in the present invention, it is preferable that the melting point of the sheath part is lower than the melting point of the core part from the viewpoint of improving the adhesiveness with the pulp fiber and effectively suppressing the dryer dirt. Furthermore, the difference in melting point between the sheath and the core is preferably about 40 to 120 ° C, more preferably about 80 to 110 ° C. By having a core-sheath type structure in which a polymer having a melting point lower by 40 ° C. or more than the polymer forming the core part is arranged on the surface as a heat fusion component, the adhesion of the polyester fiber can be improved. On the other hand, by setting the difference in melting point to 120 ° C. or less, it is possible to effectively suppress dryer contamination.

  Here, as the polyester-based elastomer arranged as the heat fusion component, a polyether ester copolymer obtained by copolymerizing thermoplastic polyester as a hard segment and poly (alkylene oxide) glycol as a soft segment, more specifically, For alicyclic such as terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid At least one dicarboxylic acid selected from the group consisting of aliphatic dicarboxylic acids such as dicarboxylic acid, succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanedioic acid and dimer acid, or ester-forming derivatives thereof; 4-butanediol, ethylene glycol, trimethylene glycol Aliphatic diols such as tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol and decamethylene glycol, or alicyclic rings such as 1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol and tricyclodecane methanol At least one diol component selected from the formula diols, or ester-forming derivatives thereof, and polyethylene glycol, poly (1,2- and 1,3-polypropylene oxide) having an average molecular weight of about 400 to 5,000 ) Glycol, poly (tetramethylene oxide) glycol, copolymers of ethylene oxide and propylene oxide, poly (alkylene oxide) cricols such as copolymers of ethylene oxide and tetrahydrofuran Out it can be mentioned terpolymer composed of at least one.

  In particular, from the viewpoint of adhesiveness, temperature characteristics, and strength, block copolymer polyether esters having polybutylene terephthalate as a hard component and polyoxybutylene glycol as a soft segment are preferable. In this case, the polyester portion constituting the hard segment is polybutylene terephthalate in which the main acid component is terephthalic acid and the main diol component is a butylene glycol component. Of course, a part of this acid component (usually 30 mol% or less) may be substituted with another dicarboxylic acid component or an oxycarboxylic acid component, and similarly a part of the glycol component (usually 30 mol% or less). May be substituted with a dioxy component other than the butylene glycol component. Further, the polyether portion constituting the soft segment may be a polyether substituted with a dioxy component other than butylene glycol.

  Copolyester polymers include aliphatic dicarboxylic acids such as adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and naphthalenedicarboxylic acid and / or fats such as hexahydroterephthalic acid and hexahydroisophthalic acid. A co-polymer containing a predetermined number of cyclic dicarboxylic acids and aliphatic or alicyclic diols such as diethylene glycol, polyethylene glycol, propylene glycol, and paraxylene glycol, with addition of oxyacids such as parahydroxybenzoic acid as desired. Polymerized esters and the like can be mentioned. For example, polyesters obtained by adding and copolymerizing isophthalic acid and 1,6-hexanediol in terephthalic acid and ethylene glycol can be used.

  In addition, as long as the effects of the present invention are not impaired, for example, low density polyethylene, high density polyethylene, polypropylene, and synthetic fibers of polyolefin polymers such as those obtained by modifying them can be contained.

  Although it does not specifically limit as a form of the polyester fiber which has a core-sheath-type structure, It is important that polyester and a heat-fusion component are core-sheath types. In this core-sheath type polyester fiber, polyester serves as a core part, and the heat fusion component serves as a sheath part, but the core part may be concentric or eccentric. From the viewpoints of adhesion to the main fibers, blocking resistance in the paper making process, dispersibility, and the like, it is more preferable to dispose polyester in the core and dispose low-melting polyester in the sheath. In the above-mentioned polyester fiber, various stabilizers, ultraviolet absorbers, thickening and branching agents, matting agents, coloring materials and other various improving agents may be blended as necessary.

  The fiber length of the specific polyester fiber in the present invention is preferably 3 to 7 mm. By making the fiber length of the polyester fiber 3 mm or more, the dimensional stability can be improved. On the other hand, when the thickness is 7 mm or less, the amount of fluffing can be reduced, and at the time of preparation processes such as fiber disaggregation and dispersion, synthetic fibers or synthetic fibers can be used in pipes, pulp storage tanks, paper machine stock inlets, dewatering wires, etc. Fibers and wood pulp fibers are entangled with each other to easily form flocs, and the possibility of deterioration of formation and the possibility of paper breakage can be reduced, thereby improving papermaking suitability. A more preferable fiber length range is 4 to 6 mm. In addition, the fiber length in this invention is the value which measured the weight weight average fiber length using METSO company make and FIBER LAB which is an optical fiber length measuring apparatus.

  Moreover, it is preferable that the fineness of the specific polyester fiber in this invention is 0.1-4.0 dtex. By setting the fineness of the polyester fiber to 0.1 dtex or more, it is possible to increase the paper strength of the backing paper for wallpaper and reduce the possibility of paper breaks. On the other hand, the amount of fluffing can be reduced by setting it to 4.0 dtex or less. A more preferable fineness range is 0.5 to 3.3 dtex, and further preferably 1.0 to 2.5 dtex. In addition, 1 dtex is the mass (gram number) per 10,000 m.

  The backing paper for wallpaper consists of a paper substrate containing at least fibers made of pulp fibers and synthetic fibers, and a filler. Such a paper base material can be obtained as a web-like paper base material by forming a paper layer by a papermaking process using these raw material slurries and drying in a papermaking process or a drying process. The paper making conditions are not particularly limited. As the paper machine, a known machine such as a long net paper machine, a twin wire paper machine, or a circular net paper machine can be appropriately used. Moreover, it does not specifically limit as a drying process, For example, a cylinder dryer, a Yankee dryer, an infrared dryer, a hot air dryer etc. can be used individually by 1 type or in combination of 2 or more types. In the present invention, it is preferable to use a cylinder dryer from the viewpoint of adjusting the basis weight to a preferable range and fully exhibiting the effects of the present invention.

The basis weight of wallpaper backing sheet is preferably 40~150g / ^{m 2,} and more preferably 60 to 100 / ^{m 2.} By setting the basis weight to 40 g / m ² or more, the strength can be increased and the risk of paper breakage during processing can be reduced. On the other hand, by setting it as 150 g / m < ² > or less, when processed into a wallpaper, it does not become hard too much and construction becomes easy.

  The backing paper for wallpaper of the present invention produced as described above preferably has a Canadian standard freeness (CSF) of 400 to 600 ml when re-disaggregated. By setting the Canadian freeness to 400 ml or more when re-disaggregated, it is possible to effectively reduce the elongation when applying a water-based paste to the wallpaper product and to reduce the shrinkage during drying. Thereby, the opening (gap) of the wallpaper stuck next to each other can be further reduced. On the other hand, by setting it to 600 ml or less, it is possible to increase the paper strength and suppress the occurrence of fluffing on the paper base material. In addition, when the backing paper for wallpaper contains a filler, the freeness when re-disaggregated from the freeness of pulp alone tends to decrease. The Canadian standard freeness when re-disaggregated may be the same as or different from the Canadian standard freeness of the pulp used alone.

  The tensile strength of the wallpaper backing paper is preferably 1.50 kN / m or more, and more preferably 2.00 kN / m or more. By setting the tensile strength to 1.50 kN / m or more, sufficient tensile strength can be obtained in handling during winding during manufacturing or processing, and there is a risk that paper breakage may occur during winding and productivity may be reduced. Absent.

  The wet tensile strength of the wallpaper backing paper is preferably 0.30 kN / m or more, and more preferably 0.35 kN / m or more. By setting the wet tensile strength to 0.30 kN / m or more, it is possible to increase the strength after applying the glue, suppress the occurrence of tearing or the like during construction, and improve work efficiency. The wet tensile strength may be adjusted, for example, by adjusting the type and amount of wet paper strength agent.

  The underwater elongation of the wallpaper backing paper is preferably 1.5% or less, and more preferably 1.0% or less, from the viewpoint of improving curling prevention and opening prevention. In addition, the elongation in water is the value of JAPAN TAPPI paper pulp test method No. It is a value measured according to 27: 2000.

  The backing paper for wallpaper can be used as wallpaper by providing a decorative layer on at least one surface thereof. As wallpaper, for example, vinyl wallpaper provided with a vinyl chloride resin layer as a decorative layer, olefin wallpaper provided with an olefin resin layer, woven wallpaper provided with a fabric layer, paper wallpaper provided with a paper layer, inorganic provided with an inorganic layer Examples include wallpaper products such as wallpaper. In any case, the decorative layer can be printed, foamed or embossed as necessary.

  The present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, “parts” and “%” represent “parts by mass” and “mass%”, respectively.

Example 1
Hardwood bleached kraft pulp as a fiber (Canadian standard freeness of 450 ml), polyester fiber having a core-sheath structure with a fiber length of 5 mm and a fineness of 2.2 dtex (polyethylene terephthalate homopolymer with a core melting point of 260 ° C., sheath with a melting point) Polyester having a core-sheath structure for each content ratio using a polyethylene terephthalate copolymer at 150 ° C., using kaolin (trade name: “UW-90”, manufactured by BASF) as a filler, and mixing both. The raw material slurry was prepared so that the fiber was 25% by mass in the solid amount of the total fiber, and kaolin was 9% by mass in the total solid amount of the backing paper for wallpaper. In the raw material slurry, 0.5 parts by mass of a sulfuric acid band and rosin sizing agent (trade name: “Size Pine N775”, solid content concentration 50%, Arakawa Chemical Industries, Ltd. with respect to 100 parts by mass of pulp raw material in terms of solid content 0.1 parts by mass) and a polyamide-epichlorohydrin resin (trade name: “Arafix 255”, solid concentration 25%, manufactured by Arakawa Chemical Industries, Ltd.) 1.0 as a wet paper strength agent Part by weight was added. Furthermore, 0.01 part by weight of cationic polyacrylamide (trade name: “Keith Rock RP401L”, manufactured by Kyowa Sangyo Co., Ltd.) was added as a yield improver. Using the obtained mixture, a backing paper for wallpaper having a basis weight of 70 g / m ² was obtained through a paper making process and a drying process using a long paper machine and a cylinder dryer.

Example 2
In Example 1, the melting point of the sheath of the polyester fiber was changed to 180 ° C. instead of 150 ° C., and the content of the polyester fiber was changed to 15% by mass instead of 25% by mass. A lining paper was obtained.

Example 3
In Example 1, the fiber length of the polyester fiber is 3 mm instead of 5 mm, the melting point of the sheath is 180 ° C. instead of 150 ° C., the content is 20% by mass instead of 25% by mass, and the content of kaolin A backing paper for wallpaper was obtained in the same manner as in Example 1 except that 9% by mass was replaced with 8% by mass.

Example 4
In Example 1, the fiber length of the polyester fiber is 7 mm instead of 5 mm, the melting point of the sheath is 180 ° C. instead of 150 ° C., the content is 8% by mass instead of 25% by mass, and the content of kaolin A backing paper for wallpaper was obtained in the same manner as in Example 1 except that the content was changed to 17% by mass instead of 9% by mass.

Example 5
A backing paper for wallpaper was obtained in the same manner as in Example 4 except that the basis weight was changed to 50 g / m ² in Example 4.

Example 6
In Example 1, the melting point of the polyester fiber sheath was changed to 180 ° C. instead of 150 ° C., the polyester fiber content was changed to 20% by mass, and the kaolin content was changed to 9% by mass. A wallpaper backing paper was obtained in the same manner as in Example 1 except that the content was 3% by mass.

Comparative Example 1
Backing for wallpaper in the same manner as in Example 1, except that the melting point of the sheath of the polyester fiber is 130 ° C. instead of 150 ° C., and the kaolin content is 15% by mass instead of 9% by mass. I got paper.

Comparative Example 2
In Example 1, the melting point of the sheath of the polyester fiber was changed to 180 ° C. instead of 150 ° C., the content rate was changed to 15% by mass instead of 25% by mass, and the content rate of kaolin was changed to 9% by mass and 1% by mass. A wallpaper backing paper was obtained in the same manner as in Example 1 except that.

Comparative Example 3
In Example 1, the melting point of the sheath of the polyester fiber was changed to 180 ° C. instead of 150 ° C., the content rate was changed to 15% by mass instead of 25% by mass, and the content rate of kaolin was changed to 9% by mass and 25% by mass. A wallpaper backing paper was obtained in the same manner as in Example 1 except that.

Comparative Example 4
In Example 1, the melting point of the sheath of the polyester fiber was changed to 180 ° C. instead of 150 ° C., the content ratio was changed to 40% by mass instead of 25% by mass, and the kaolin content was changed to 9% by mass and 20% by mass. A wallpaper backing paper was obtained in the same manner as in Example 1 except that.

Comparative Example 5
A backing paper for wallpaper was obtained in the same manner as in Example 1 except that polyester fibers were not used and the kaolin content was changed to 15% by mass instead of 9% by mass.

  The following evaluation was performed about the backing paper for wallpaper obtained in this way, and each fiber used. The results were as shown in Table 1.

(Tensile strength)
The backing paper for wallpaper was cut into 15 mm in the width direction and 250 mm in the flow direction to prepare a sample. After heating and drying at 110 ° C. for 10 minutes, the spacing between the grips was set to 180 mm in accordance with JIS P 8113: 2006. Tensile strength was measured, displayed in units of kN / m, and evaluated according to the following criteria.
(Double-circle): It is 2.00 kN / m or more, and there is no problem.
○: 1.50 kN / m or more and less than 2.00 kN / m, and there is no practical problem.
X: Less than 1.50 kN / m, which is a practical problem.

(Underwater elongation)
For wallpaper backing paper, as a measure of dimensional stability in the width direction, JAPAN TAPPI Paper Pulp Test Method No. 27: 2000, the elongation in water was measured and evaluated according to the following criteria.
A: 1.5% or less, no problem in practical use.
X: Greater than 1.5%, which is a practical problem.

(Dryer dirt)
Dryer stains in the paper making process and the drying process were visually observed and evaluated according to the following criteria.
○: No transfer of resin or the like to the dryer.
×: Transfer of resin or the like to the dryer.

(Peel aptitude)
A cross tape (manufactured by Oji Tac Co., Ltd.) was pasted on one side of the wallpaper backing paper to make a strip sample having a width direction of 11 cm and a flow direction of 5 cm. The wallpaper paste was applied to the backing paper side of this sample using a wallpaper paste (Yaoi Chemical Co., Ltd., trade name: “Lure Mild”) at a coating amount of 120 g / m ² . The paste-coated surface was bonded to a gypsum board using a roller to obtain a peel suitability evaluation sample.

After holding the peel aptitude evaluation sample at 23 ° C. and 50% RH for 24 hours, peel off the peel aptitude evaluation sample from the gypsum board and visually observe the gypsum board surface (wall surface). It was evaluated with.
○: The backing paper for wallpaper is uniformly peeled between the papers, and the wall surface is not uneven.
X: The backing paper for wallpaper is peeled off unevenly (breaking, etc.), and the wall surface is uneven.

(Fiber length)
About the polyester fiber which has a core-sheath-type structure, the weight weight average fiber length was measured using METSO company make and FIBER LAB which is an optical fiber length measuring apparatus.

(Fineness)
About the polyester fiber which has a core-sheath structure, the fineness was measured using the motorcycle bro type fineness measuring device Denior ComputerDC-11 (made by search control electric).

  The wallpaper backing paper of the present invention is free from dryer stains in the paper making process or drying process, has excellent dimensional stability during wallpaper construction, peelability when peeling the wallpaper from the wall surface, tensile strength of the backing paper, underwater dimensions It is a backing paper for wallpaper with excellent stability and is extremely useful in industry.

As a result of intensive studies in view of the above-described conventional technology, the present inventors have solved the above-described problems. That is, the present invention relates to the following paper backing paper .

Claims (6)

  A backing paper for wallpaper containing at least pulp fibers and synthetic fibers, and a filler, and has a core-sheath structure having a melting point of the core part of 200 ° C or higher and a melting point of the sheath part of 150 ° C or higher as the synthetic fiber. A polyester wallpaper comprising 5 to 30% by mass of the solid fiber of the total fiber and kaolin as a filler in a proportion of 3 to 20% by mass of the total solid of the wallpaper backing paper. Backing paper.   The wallpaper backing paper according to claim 1, wherein the melting point of the sheath of the polyester fiber is lower than the melting point of the core.   The backing paper for wallpaper of Claim 1 or 2 whose melting | fusing point of the sheath part of the said polyester fiber is lower than melting | fusing point of a core part, and the difference of melting | fusing point of a sheath part and a core part is 40-120 degreeC.   The backing paper for wallpaper of any one of Claims 1-3 whose melting | fusing point of the sheath part of the said polyester fiber is 180 degreeC or more.   The backing paper for wallpaper of any one of Claims 1-4 whose fiber length of the said polyester fiber is 3-7 mm. The backing paper for wallpaper of any one of Claims 1-5 whose basic weight is 40-150 g / m < ² >.