JP2011208323A - Backing paper for wallpaper and wallpaper using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wallpaper which needs no binder impregnation of a backing paper, is produced at a low cost, prevents nap in painting a polyvinyl chloride paste or the like or subsequent drying, reduces curling when a glue is applied to the wallpaper, and prevents opening after construction, and can be removed so that a part of the wallpaper may not remain by using a dedicated glue with low adhesiveness for bonding when the wallpaper is removed from a wall during renovation.SOLUTION: The backing paper for wallpaper comprises 5-25 mass% of a synthetic fiber including a thermoplastic resin and less than 3% of an ash content. The synthetic fiber is a core sheath fiber comprising a polyester whose core melting point is 200°C or higher, a polyethylene whose sheath softening point is 100 to 150°C or a low melting point polyester. Additionally, the backing paper which has a fiber length of 4 to 7 mm and a fineness of 0.5 to 3.0 dtex is used.

Description

  The present invention relates to a backing paper for wallpaper used for vinyl chloride wallpaper and the like and wallpaper using the same.

  The wallpaper is affixed to the wall for a long period of time in order to beautify the room in general houses, hotels, hospitals, and the like. The wallpaper includes a vinyl wallpaper, an olefin wallpaper, a fabric wallpaper, a paper wallpaper, an inorganic wallpaper, and the like. It is comprised by the backing paper for hold | maintaining.

  These wallpapers are glued to the wall with water-based glue such as starch, vinyl acetate resin, methylcellulose, etc. during construction, but the backing paper absorbs moisture in the glue in the gluing process, so the wallpaper becomes soft, The backing paper may stretch due to increased moisture. For these reasons, the wallpaper is curled, which makes it difficult to apply the wallpaper to the wall, and causes problems such as the occurrence of wrinkling after the application. Furthermore, since the backing paper contracts when the glue dries, there is a problem in that a gap (opening) is generated at the joint portion between the adjoining wallpaper and the design properties after construction are impaired.

As an improvement in the dimensional stability of backing paper, backing paper (Patent Documents 1 to 5) containing inorganic fibers such as glass fibers that are less stretched by moisture, and backing paper containing synthetic fibers such as polyolefin, polyester, polyamide, etc. It is disclosed.
However, since inorganic fibers such as glass fibers do not have self-adhesive properties, the workability of the fibers being easily removed from the sheet is inferior, and fiber fluffing occurs during paper making and wallpaper processing. In addition, since the glass fiber is rigid, when it comes into contact with the skin, a tingling irritation occurs, which causes discomfort to humans. Therefore, backing paper containing inorganic fibers has not been widely used.

Also, backing paper using synthetic resin fibers has been proposed (Patent Documents 6 to 9). In these backing papers, synthetic resin fibers are hydrophobic, while wood pulp is hydrophilic, and the interfiber bond (hydrogen bond) between synthetic resin fibers and wood pulp after paper making is weak, and the interlaminar strength of the backing paper Because of the weakening, most of the peeling at the time of reforming is peeling between the layers of the wallpaper.
Further, a non-peeling nonwoven fabric for wallpaper backing having a two-layer structure in which the functions of the first layer and the second layer are separated has been proposed on the assumption that re-peeling after wallpaper construction does not cause separation between layers (Patent Document 10).

Japanese Examined Patent Publication No. 7-122236 JP-A-8-1000039 JP-A-8-325997 Japanese Patent Publication No. 8-26631 Japanese Patent No. 3252265 JP-A-5-59696 JP-A-5-59698 JP-A-5-59699 JP 2007-77526 A JP 2009-179900 A

In wallpaper using wallpaper backing paper that contains synthetic fibers as described in Patent Documents 6 to 9, when peeling between the wallpaper layers, part of the wallpaper remains on the wall randomly There has been a problem that it is sometimes necessary to prepare the base to be flat. Moreover, in the case of the wallpaper described in Patent Document 10, since the backing paper has two layers, the facility is restricted, and the raw material is different between the first layer and the second layer, so that the manufacturing process is complicated. In addition, a method of impregnating the backing paper with a binder in order to separate it with a glue layer existing between the wall surface and the wallpaper is also conceivable, but a coating facility is necessary, and there is a problem that the cost increases when the binder is impregnated. is there.
Therefore, the object of the present invention is that there is little fuzz even when the binder is not impregnated in the paper, the curl is small when the wallpaper is coated with glue for construction, no opening occurs after construction, It is an object of the present invention to provide wallpaper backing paper and wallpaper that can be peeled off by a glue layer when peeling.

  As a result of intensive studies on the above object, the present inventors have included a thermoplastic resin having a specific range of fiber length and fineness and a specific melting point or softening point in a paper backing paper produced by a paper machine. When the synthetic fiber is contained and the ash content in the backing paper is specified (preferably when the smoothness of the surface on which the paste is applied to the wallpaper is specified), the above problem can be solved. As a result, the present invention has been achieved.

That is, the present invention is a wallpaper backing paper containing 5 to 25% by mass of a synthetic fiber containing a thermoplastic resin and having an ash content of less than 3%, the synthetic fiber comprising a polyester having a melting point of 200 ° C. or higher, The sheath is a core-sheath fiber made of polyethylene having a softening point of 100 ° C. or higher and 150 ° C. or lower, and has a fiber length of 4 mm to 7 mm and a fineness of 0.5 dtex to 3.0 dtex. It is a backing paper for wallpaper.
Further, the present invention is a wallpaper using the above-mentioned backing paper for wallpaper, and further, the Wangen-type smoothness on the side of the glue coated surface after the wallpaper is manufactured is measured at a pressure corresponding to 2000 mm of water column and is 20 seconds or less. preferable.

  The wallpaper of the present invention does not require binder impregnation of the backing paper, is low in production cost, is adhered with a special adhesive having low adhesiveness, and when the wallpaper is peeled off from the wall at the time of reforming, a part of the wallpaper remains on the wall surface. Can be peeled off. In addition, by blending synthetic fiber into the backing paper, curl when glue is applied to the wallpaper is small, and it is possible to suppress the opening after construction, without having a two-layer structure or impregnating with a binder However, it is possible to suppress printing defects due to fluffing.

Hereinafter, embodiments of the present invention will be described.
The backing paper for wallpaper of the present invention has a decorative layer on its surface to provide wallpaper. For example, a vinyl chloride resin layer, an olefin resin layer, a fabric layer, a paper layer, and an inorganic layer can be provided as a decorative layer to make a wallpaper. In any case, the decorative layer can be subjected to surface printing, foaming treatment and embossing treatment as necessary.

  As a form of the synthetic fiber containing the thermoplastic resin used in the present invention, it is essential that the fiber has a fiber length of 4 to 7 mm. When the thickness is less than 4 mm, the paper-making property is good, but the entanglement between the wood pulp of the backing paper and the synthetic fiber is reduced, and the peelability at the glue layer is deteriorated. When the fiber length exceeds 7 mm, synthetic fibers or synthetic fibers and wood pulp fibers are entangled in piping, pulp storage tanks, paper machine stock inlets, dewatering wires, etc. during preparation processes such as fiber disaggregation and dispersion. As a result, it becomes easy to form a flock, and the formation is easily deteriorated and the paper is easily cut. Furthermore, a lot of fuzz that causes printing defects occurs. More preferably, it is less than 6 mm.

  It is essential that the fineness (thickness) of the synthetic fiber containing the thermoplastic resin used in the present invention is 0.5 to 3.0 dtex. When the fineness of the fiber is less than 0.5 dtex, the paper strength of the backing paper is reduced, and paper breakage is likely to occur. Furthermore, the curl when the paste is applied to the wallpaper becomes large, and the opening after construction is likely to occur. If the fineness of the fiber exceeds 3.0 dtex, the synthetic fiber becomes stiff and the amount of fluffing increases. Further, since the number of synthetic fibers per weight in the wallpaper base paper is reduced, the number of fibers fused after the heat treatment in the foaming / embossing process is reduced, so that the interlaminar strength is not increased and the peelability is deteriorated. Preferably it is 2.5 dtex or less, More preferably, it is 2.0 dtex or less.

The backing paper for wallpaper of the present invention contains the above-described synthetic fiber in a range of 5% by mass to 25% by mass. In this way, by using synthetic fibers that hardly undergo expansion and contraction due to moisture, it is possible to suppress the occurrence of water absorption curl due to paste coating on the wallpaper and the opening after drying. In addition, the inclusion of synthetic fibers suppresses the occurrence of blisters (blowing between the backing paper and the vinyl chloride layer) that occurs when vinyl paste is applied, compared to wallpaper base paper made from wood pulp fibers only. can do.
When the synthetic fiber is less than 5% by mass, the dimensional stability against water absorption and drying is insufficient, and curling and opening are likely to occur. Moreover, since the fusion of the fibers is reduced after the heat treatment in the foaming / embossing step, the interlaminar strength is not increased and the peelability is deteriorated. On the other hand, when the content of the thermoplastic synthetic fiber exceeds 25% by mass, paper breakage occurs during the paper making process or when the vinyl chloride resin layer, olefin resin layer, fabric layer, paper layer, and inorganic layer are provided as a decorative layer. It becomes easy. Furthermore, the amount of fluffing increases during the coating of vinyl chloride paste or the like. The more preferable content of the synthetic fiber including the thermoplastic resin is 15% by mass or less.

  In the present invention, it is essential to use a core / sheath fiber of polyethylene or a low melting point polyester having a core part having a melting point of 200 ° C. or more and a sheath part having a softening point of 100 ° C. or more and 150 ° C. or less. When the softening point of the resin in the sheath is lower than 100 ° C., the synthetic fiber adheres to the dryer of the paper machine and stains easily occur. In addition, since the wallpaper base paper is heated to about 200 ° C in the foaming / embossing heating process after the decorative layer is provided on the base paper, only the sheath is melted if the melting point of the resin constituting the core is 200 ° C or higher. Then, the core part remains as the main fiber without melting, and by fusing with the main fiber or wood pulp, there is an effect of suppressing the dimensional change due to expansion and contraction of the pulp fiber caused by water absorption and drying. Excellent stability. When the softening point of the resin of the sheath exceeds 150 ° C., the sheath is difficult to melt and the above effect cannot be obtained.

When polyethylene single fiber is used without using the core-sheath fiber, it is heated to about 200 ° C. in the heating process of foaming / embossing after the decorative layer is provided on the wallpaper base paper. Since all the fibers are melted and the shape of the fibers does not remain, the effect of suppressing the dimensional change with respect to water absorption and drying is small, and the dimensional stability is not sufficient.
In addition, since the melting point of polypropylene and polyester single fibers is too high, fusion between pulp fibers, polypropylene and polyester fibers does not occur in the foaming / embossing process, so dimensional stability is higher than when using the core-sheath fibers. In addition to being inferior, the interlaminar strength becomes weak, and when peeling the wallpaper from the wall surface, it becomes difficult to peel it so that a part of the wallpaper does not remain.

When the core of the core-sheath fiber is polypropylene, it is more flexible and easier to bend than polyester. Therefore, the effect of suppressing dimensional change against the expansion and contraction of pulp fibers caused by water absorption and drying is inferior, and dimensional stability Is not enough.
When the sheath of the core-sheath fiber is a low-melting polyester having a softening point of less than 100 ° C or ethylene vinyl alcohol having a melting point of less than about 100 ° C when wet with water, the core-sheath fiber adheres to the dryer of the paper machine and stains occur. It becomes easy to do.

When the sheath of the core-sheath fiber is polypropylene, the melting point is as high as around 170 ° C, so the pulp fibers and synthetic fibers are not sufficiently fused together in the foaming / embossing process, so part of the wallpaper does not remain on the wall surface Thus, it becomes difficult to peel off with the glue layer.
Furthermore, in the vinylon binder fiber having a dissolution temperature in water of 60 to 80 ° C., the fiber adheres to the dryer of the paper machine, and stains easily occur. With vinylon-based fibers whose melting temperature in water is 99 ° C or higher, pulp fibers and synthetic fibers do not fuse with each other in the foaming / embossing process, so they can be peeled off with a glue layer so that part of the wallpaper does not remain on the wall. It becomes difficult.

  As the fiber component other than the synthetic fiber containing the thermoplastic synthetic resin used for the backing paper of the present invention, wood pulp such as softwood, hardwood chemical pulp, mechanical pulp, and recycled pulp obtained from waste paper, bast pulp Natural pulp such as non-wood pulp such as linter pulp and hemp pulp can be used, but wood pulp is preferably used in terms of quality and cost.

The backing paper for wallpaper of the present invention improves the peelability from the glue layer by sufficiently fusing the synthetic fibers and pulp fibers or synthetic fibers together in the foaming / embossing process and improving the interlayer strength of the backing paper. Yes. For that purpose, the lower the ash content, the better. In the present invention, it is essential that the ash content be less than 3% by mass.
When the ash content is 3% by mass or more, the fiber-to-fiber bond between the pulp fibers at the time of making the backing paper is hindered, and fluffing is likely to occur. In addition, the core-sheath fibers are separated from each other in the foaming / embossing process. Therefore, it becomes difficult to peel off with a glue layer so that a part of the wallpaper does not remain on the wall surface.

  As mentioned above, the lower the ash content, the more the fiber bonding of the backing paper increases, so the fluffing decreases, and the interlaminar strength after the embossing process increases, so that part of the wallpaper does not remain on the wall (in the glue layer) ) Easy to peel off. In the present invention, in the range of less than 3% by mass of ash, calcined clay, kaolin, delaminated kaolin, illite, heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica composite, magnesium carbonate, barium carbonate, dioxide You may contain inorganic fillers, such as titanium, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide. Moreover, you may use together organic fillers, such as urea- formalin resin, a polystyrene resin, and a phenol resin. The ash content is calculated by a method specified in JIS P 8251.

In the present invention, as the internal additive, a sizing agent, a fixing agent, a dry paper strength agent, a wet paper strength agent, a yield improver, a dye, a pigment, and the like can be used. Examples of sizing agents include rosin sizing agents, rosin emulsion sizing agents, and alpha carboxymethyl saturated fatty acids in the case of acidic papermaking. In the case of neutral papermaking, rosin for neutral papermaking. Examples thereof include sizing agents, alkyl ketene dimers, alkenyl succinic anhydrides, and cationic polymer sizing agents. The addition amount of the sizing agent is not particularly limited, and it is preferable that the sticky sizing degree of the backing paper is 10 seconds or more. For example, when the basis weight of the backing paper is 60 g / m ² , it is preferable to add 0.35% by mass or more of the rosin-based sizing agent with respect to the fiber content.

The basis weight of the backing paper for wallpaper of the present invention is preferably 40 g / m ² or more and 120 g / m ² or less. If the basis weight is less than 40 g / m ² , the strength is low and paper breakage is likely to occur during processing. On the other hand, if the basis weight exceeds 120 g / m ² , it becomes too hard when processed into wallpaper, resulting in a drawback that the construction becomes difficult.

  The backing paper for wallpaper of the present invention can be made with a known paper machine. Examples of the paper machine include a long net paper machine, a twin wire paper machine, and a circular net paper machine.

  The wallpaper of the present invention can be obtained by providing a decorative layer on the surface layer of the backing paper of the present invention. For example, a vinyl wallpaper provided with a vinyl layer as a decorative layer, an olefin wallpaper provided with an olefin layer, a woven wallpaper provided with a fabric layer, a paper wallpaper provided with a paper layer, an inorganic wallpaper provided with an inorganic layer, and the like. In any case, after providing a decorative layer, printing is performed as necessary, and heating to about 200 ° C. is performed to perform foaming or embossing to obtain a decorative layer.

Applying glue on the opposite side of the decorative layer of the wallpaper after foaming and embossing after applying the decorative layer, and sticking it to the wall, but the smoothness of the wallpaper on the side of the adhesive coated surface is Oken type smoothness meter Thus, the measurement pressure is a pressure corresponding to a water column of 2000 mm and is preferably 20 seconds or less. When the smoothness exceeds 20 seconds, the contact area between the wall and the wallpaper increases, so even if the adhesive is bonded with a special adhesive having a low adhesiveness, the peelability at the adhesive layer is deteriorated, and the wall surface of the wallpaper is reduced. It becomes difficult to peel off with the glue layer so that no part remains.
In the present invention, the smoothness is determined by the Oken Air Permeability / Smoothness Tester of JAPAN TAPPI Paper Pulp Test Method No.5-2: 2000 (Paper and Paperboard—Smoothness and Air Permeability Test Method— Part: Oken method), the measurement pressure is increased.

  The wallpaper backing paper of the present invention is preferably free from fluff when a vinyl chloride paste is applied. The fluffing can be evaluated by counting the number of fluffing (number of projections) on the vinyl chloride coated surface, which occurs when the vinyl chloride paste is applied using an applicator.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited by this. About the backing paper for wallpaper obtained by each Example and the comparative example, the characteristic test was done with the following method. The results are summarized in Tables 1 and 2.

<Fiber length measurement>
The weight-weighted average fiber length was measured using FIBER LAB manufactured by METSO, which is an optical fiber length measuring device.

<Fineness measurement>
The measurement was performed using a motorcycle blower fineness measuring instrument Deni Computer DC-11 (manufactured by Search Control Denki). In addition, 1 dtex is the weight (gram number) per 10,000 meters.

<Measurement of softening point and melting point of synthetic fiber>
Measurement was carried out with a differential scanning calorimeter (Thermo Plus DSC8230, manufactured by Rigaku Corporation) at a heating rate of 10 ° C./min.

<Dryer dirt>
A hand-sheet is prepared so that the density is 0.6 g / cm ³ after drying at a basis weight of 65 g / m ^2, and dried by passing through a cylinder dryer having a surface temperature of 100 ° C. in a state of moisture of 50%. The degree of fiber adhesion on the cylinder dryer surface was observed. When fiber adhesion was observed on the surface of the cylinder dryer, paper making was not performed with a long net paper machine.
(Evaluation)
○: No fiber adhesion, ×: Fiber adhesion

<Elongation in water>
The test piece was completely dried at 140 ° C. for 2 minutes, and the humidity was adjusted at 23 ° C. in a 50% R / H atmosphere for 2 hours. The test piece was immersed in pure water, left for 1 hour, then taken out, and the lateral length immediately after taking out was measured. The water elongation (%) was determined by the following formula.
Elongation in water (%): (length after water immersion-length before water immersion) / length before water immersion x 100

<Aperture>
A vinyl chloride paste was applied to the surface of the backing paper using an applicator so that the coating thickness was 200 μm, and heated at 145 ° C. for 1 minute to gel. The obtained vinyl chloride wallpaper was cut into a sample having a length of 1 m and a width of 95 cm. Prepare two samples and apply to the backing paper the starch-based Conadaine F (dissolved in a ratio of 17 kg of water to 1 kg of powder paste) of starch-based Far East Industrial Machinery Co., Ltd., which has low peel strength when peeling the wallpaper from the wall surface. The veneer plate was 2m wide and 1m long, and was pasted so that the edges of the two pieces of wallpaper overlapped, and the overlapped part was cut with a cutter so that the joints could not be seen. Then, it was left to stand for 7 days in an atmosphere of 23 ° C. and 50% R / H to be completely dried, and evaluation was made according to the following criteria depending on whether or not an opening occurred at the joint portion after drying. ○ If it is above, there is no practical problem.
(Evaluation)
○: No opening, △: Some opening, ×: Opening

<Evaluation of fluff>
The wallpaper backing paper was conditioned for 24 hours in an environment of 23 ° C. and 50 RH%, and then cut to 32 cm (MD direction) and 20 cm (CD direction). In sampling, sufficient care was taken not to rub the paper. ^Two high quality papers having a basis weight of 150 g / m ² were laid on the glass plate and fixed with clips. Next, gauze was wrapped around a metal rectangular parallelepiped (width: about 400 g) having a width of 250 mm, a length of 130 mm, and a thickness of 15 mm, and the surface of the fine paper was rubbed twice to smooth the surface of the gauze.
Place a sample of wallpaper backing paper on the surface of another high-quality paper so that the F-side that will be coated with vinyl chloride is on top, and in a metal cuboid wrapped with gauze, under its own weight, from top to bottom in the MD direction Rubbed once towards. The wallpaper backing paper was changed in the vertical direction and similarly rubbed once from top to bottom.
In this way, using an applicator with a coating thickness of 200 μm on the place where the backing paper for wallpaper was rubbed, after applying the vinyl chloride paste, put it in a dryer at 145 ° C. for 1 minute to gel the vinyl chloride paste. Made it. A pattern cut out to a size of 15 cm in the CD direction and 20 cm in the MD direction was placed on the center of the surface of the gelled vinyl chloride layer, and the number of protrusions (defects) generated therein was measured. The measured values of three samples prepared in the same manner were totaled to obtain the number of protrusions per sample (number per 900 cm ² ). The case where the number of measured protrusions was 20 or less was evaluated as ◯, the case where it was 21 to 30 was evaluated as Δ, and the case where it was 31 or more was evaluated as ×. If ○, there is no practical problem.

<Peelability at glue layer>
The vinyl chloride paste was applied to the backing paper for wallpaper with an applicator so as to have a thickness of 150 μm, and placed in a dryer at 145 ° C. for 1 minute to gel the vinyl chloride paste. Then, after heating and foaming at 200 ° C. for 10 seconds in a blow dryer, embossing was performed at a linear pressure of 50 kg / cm, and an A4 size wallpaper was produced on the table. Starch-based wallpaper paste (Kondai F, manufactured by Kyokuto Sangyo Co., Ltd.) is thoroughly stirred and dissolved at a rate of 17 kg of water with respect to 1 kg of powder paste, and the wallpaper is coated with PVC so that the wet coating amount is 100 g / m ^2. It was applied to the back side of the work surface, attached to a 9.5 mm thick semi-incombustible gypsum board (trade name: Tiger Board, manufactured by Yoshino Gypsum Co., Ltd.), left to stand for 10 days, and then peeled off and observed. The case where the gypsum board and the wallpaper were peeled off with the glue layer was evaluated as “◯”, the case where a small amount of the wallpaper remained on the surface of the gypsum board was evaluated as “B”, and the case where the wall was separated between the layers of the wallpaper was evaluated as “X”.

<Smoothness>
The wallpaper sample produced as described above was measured for smoothness on the side of the glue coating surface at a measurement pressure of 2000 mmHg using a digital type Oken air permeability smoothness tester EYO type manufactured by Asahi Seiko Co., Ltd.

[Example 1]
Bleached kraft pulp NBKP (Canadian standard freeness (CSF) 500 ml) 10 mass%, LBKP (CSF 500 ml) 75 mass%, fiber length 5 mm, fineness 1.2 dtex core sheath fiber (core: polyester fiber (melting point 256) ° C.), sheath: polyethylene fiber (melting point: 130 ° C.) 15% by weight in a pulp slurry, a sulfuric acid band was added so that the pH was 4.5, and then an alpha carboxymethyl saturated fatty acid salt (sizing agent) 0.15% by mass of NSP-S (trade name: manufactured by Seiko PMC Co., Ltd.) was added. Furthermore, 0.2% by mass of polyamide / epichlorohydrin resin (trade name: WS-547, manufactured by Seiko PMC Co., Ltd.) was added as a wet paper strength agent, and then fatty acid amine resin (trade name: N-815, Seiko PMC). (Made by Co., Ltd.) was added so that it might become 0.3 mass%. Using the obtained mixture, a backing paper for wallpaper having a basis weight of 65 g / m ² was produced using a long web paper machine (Yankee dryer). A decorative layer was provided on the surface with high smoothness in contact with the Yankee dryer, and the peelability at the adhesive layer was evaluated with respect to the surface with low smoothness not in contact with the Yankee dryer.

[Example 2]
A synthetic fiber was produced in the same manner as in Example 1 except that a core-sheath fiber having a fiber length of 7 mm (core: polyester fiber (melting point: 256 ° C.), sheath: polyethylene fiber (melting point: 130 ° C.)) was prepared. Opening, fuzzing, and peelability from the glue layer were evaluated.

[Example 3]
A synthetic fiber was prepared in the same manner as in Example 1 except that a core-sheath fiber having a fiber length of 4 mm (core: polyester fiber (melting point: 256 ° C.), sheath: polyethylene fiber (melting point: 130 ° C.)) was prepared. Opening, fuzzing, and peelability from the glue layer were evaluated.

[Example 4]
A core-sheath fiber was prepared in the same manner as in Example 1 except that a core-sheath fiber having a fineness of 2.2 dtex was blended, and the degree of elongation in water, opening, fluffing, and peelability from the glue layer were evaluated.

[Example 5]
A core-sheath fiber was prepared in the same manner as in Example 1 except that a core-sheath fiber having a fineness of 0.6 dtex was blended, and the degree of elongation in water, openings, fluffing, and peelability from the glue layer were evaluated.

[Example 6]
The same as Example 1 except that NBKP (Canadian Standard Freeness (CSF) 500 ml) of bleached kraft pulp was blended 10 mass%, LBKP (CSF 500 ml) 70 mass%, and the amount of core-sheath fiber blended 20 mass%. The film was evaluated for elongation in water, mesh opening, fluffing, and peelability from the glue layer.

[Example 7]
Example 1 except that NBKP (Canadian Standard Freeness (CSF) 500 ml) of bleached kraft pulp was blended by 10 mass%, LBKP (CSF 500 ml) was blended by 80 mass%, and the amount of core-sheath fiber was blended by 10 mass%. The film was evaluated for elongation in water, mesh opening, fluffing, and peelability from the glue layer.

[Example 8]
It was produced in the same manner as in Example 1 except that the calcined clay was blended so that the ash content was 2.5%, and the elongation in water, the openings, the fluffing, and the peelability from the glue layer were evaluated.

[Example 9]
This was prepared in the same manner as in Example 1, except that a decorative layer was provided on the surface with high smoothness in contact with the Yankee dryer, and the peelability at the glue layer was evaluated with the surface with low smoothness not in contact with the Yankee dryer. Degree of peeling, opening, fluffing, and peelability from the glue layer were evaluated.

[Comparative Example 1]
Fabricated in the same manner as in Example 1 except that a core-sheath fiber (core: polyester fiber (melting point: 256 ° C.), sheath: polyethylene fiber (melting point: 130 ° C.)) having a fiber length of 10 mm and a fineness of 1.2 dtex was blended as a synthetic fiber. The elongation in water, the opening, the fluffing, and the peelability from the glue layer were evaluated.

[Comparative Example 2]
Fabricated in the same manner as in Example 1 except that a core-sheath fiber (core: polyester fiber (melting point: 256 ° C.), sheath: polyethylene fiber (melting point: 130 ° C.)) having a fiber length of 3 mm and a fineness of 1.2 dtex was blended as a synthetic fiber. The elongation in water, the opening, the fluffing, and the peelability from the glue layer were evaluated.

[Comparative Example 3]
Fabricated in the same manner as in Example 1 except that a core-sheath fiber (core: polyester fiber (melting point: 256 ° C.), sheath: polyethylene fiber (melting point: 130 ° C.)) having a fiber length of 5 mm and a fineness of 4.4 dtex was blended as a synthetic fiber. The elongation in water, the opening, the fluffing, and the peelability from the glue layer were evaluated.

[Comparative Example 4]
The same as Example 1 except that NBKP (Canadian Standard Freeness (CSF) 500 ml) of bleached kraft pulp was blended 10 mass%, LBKP (CSF 500 ml) 60 mass%, and the amount of core-sheath fiber blended 30 mass%. The film was evaluated for elongation in water, mesh opening, fluffing, and peelability from the glue layer.

[Comparative Example 5]
The same as Example 1 except that NBKP (Canadian Standard Freeness (CSF) 500 ml) of bleached kraft pulp was compounded by 10 mass%, LBKP (CSF 500 ml) by 87 mass%, and the amount of core-sheath fiber blended by 3 mass%. The film was evaluated for elongation in water, mesh opening, fluffing, and peelability from the glue layer.

[Comparative Example 6]
It was produced in the same manner as in Example 1 except that the calcined clay was blended so as to have an ash content of 5%, and the elongation in water, openings, fluffing, and peelability from the glue layer were evaluated.

[Comparative Example 7]
This was prepared in the same manner as in Example 1 except that no synthetic fiber was added, the amount of NBKP was 10% by mass, and the amount of LBKP was 90% by mass. Elongation in water, opening, fluffing, peeling from the glue layer Sex was evaluated.

[Comparative Example 8]
As synthetic fiber, a core-sheath fiber having a fiber length of 5 mm and 1.2 dtex (core: high-melting polyester fiber (melting point: 256 ° C.), sheath: low-melting polyester fiber (softening point: 80 ° C.)) is used except 15% by weight. Was prepared in the same manner as in Example 1.

[Comparative Example 9]
A vinylon binder fiber (dissolving temperature in water: 70 ° C., fiber length: 4 mm, fineness: 1.1 dtex) was blended in an amount of 15% by weight and produced in the same manner as in Example 1.

As shown in Tables 1 and 2, the wallpaper backing paper of the present invention containing a specific amount of synthetic fiber having a core-sheath fiber with a specific range of fiber length and fineness, and an ash content within a specific range is a paste-coated surface. Although the peelability of Example 9 having a large smoothness on the side was slightly inferior, it was demonstrated that the dryer was free of dirt, excellent in dimensional stability, less fuzzing, and good peelability from the glue layer. It was.
On the other hand, in Comparative Example 1 in which the fiber length of the core-sheath fiber exceeded 7 mm, the fluff was inferior, and in Comparative Example 2 in which the fiber length of the core-sheath fiber was less than 4 mm, the peelability from the glue layer was inferior. Moreover, even in Comparative Example 3 in which the fineness of the core-sheath fiber exceeded 4.0 dtex, the result was inferior and the peelability from the glue layer was poor. In Comparative Example 4 in which the amount of the core-sheath fiber was large, the fluff was inferior, and in Comparative Example 5 in which the amount of the core-sheath fiber was small and Comparative Example 7 without the core-sheath fiber, the fluff was good, but the opening Occurred and the peelability from the adhesive layer was also poor. In Comparative Example 6 with a large amount of ash, the amount of fluffing was large and the peelability from the glue layer was poor. In Comparative Example 8 using the core-sheath fiber of the core part high melting point polyester and the sheath part low melting point polyester (80 ° C.), and in Comparative Example 9 using the PVA fiber, the dryer soil was generated, and the backing paper could not be produced. It was.

Claims (3)

  A wallpaper backing paper containing 5 to 25% by mass of a synthetic fiber containing a thermoplastic resin and having an ash content of less than 3%, wherein the synthetic fiber has a polyester core having a melting point of 200 ° C. or higher, and a sheath having a softening point 100% to 150 ° C. core-sheath fiber made of polyethylene or low-melting polyester, having a fiber length of 4 mm to 7 mm and a fineness of 0.5 dtex to 3.0 dtex Lined paper.   A wallpaper using the wallpaper backing paper according to claim 1.   The wallpaper according to claim 2, wherein the Oken-type smoothness on the side of the paste-coated surface after wallpaper production is 20 seconds or less at a measurement pressure corresponding to a water column of 2000 mm.