JP2005126844A - Wall-decorating material and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wall-decorating material which does not cause such the production of a noxious gas on combustion as that of vinylic polymer wall paper, has a soft, voluminous and hardly deformable uneven pattern, and has excellent emboss processability and applicability, and to provide a method for producing the same. <P>SOLUTION: This wall-decorating material is characterized by comprising blended paper (1) comprising bamboo pulp fibers and synthetic fibers and wall backing paper (2) laminated to the back side of the blended paper, and forming an uneven pattern (3) on the front side of the blended paper by an embossing processing method. This wall-decorating material is produced by passing blended paper produced by, if necessary, forming a water-repelling treated layer and a synthetic resin-coated layer on the front side of blended paper and laminating wall paper-backing paper to the back side between a heated emboss roll and a back roll having a flat surface to emboss the blended paper. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a wall covering mainly made of non-polluting bamboo pulp fibers without using vinyl chloride resin like vinyl wallpaper, and more specifically, has a soft texture and a volume feeling. In addition, the present invention relates to a new and improved wall covering material having excellent processability and workability, and having a concavo-convex pattern that is not easily deformed, and a method for manufacturing the same.

Conventionally, vinyl wallpaper made of vinyl chloride resin has been widely used as a wall covering material such as wallpaper used on the wall and ceiling of a house. Vinyl wallpaper has a low price, excellent processing characteristics, water resistance, antifouling properties, workability, etc., and has maintained its superiority due to its abundant design. Volatilization of the plasticizer contained in the hydrogen gas or vinyl decorative layer into the living space is regarded as a problem.

For this reason, various non-halogen materials such as an olefin resin, paper, and non-woven fabric have been studied as a material to replace the vinyl chloride resin. Above all, paper and non-woven wallpaper have a natural texture and warmth compared to vinyl wallpaper, and many proposals have been made using each material. However, the wall covering material mainly made of paper pulp uses an embossing device that combines a male roll with a convex part and a female roll with a concave part, as a method for forming an uneven pattern. There is a drawback that unevenness is formed on the front and back of the metal, making it difficult to construct. Furthermore, the concavo-convex pattern formed by this embossing device also has a problem in that it loses its shape due to a slight pressure such as roller hanging during construction and the influence of moisture.

Therefore, as a method for solving the above-mentioned problems, a device for flattening the backing paper for wallpaper on the back side of the concavo-convex pattern formed on the front and back is performed, or a protective film is pasted on the surface to lose shape and moisture. However, there is a problem that the backing paper for wallpaper is sweet and easy to peel off, and the cost is high because the protective film is pasted, and the shape loss cannot be completely suppressed. Have.

There has been proposed a technique capable of using a normal embossing device used for forming a concavo-convex pattern on a vinyl wallpaper even for a wall covering mainly made of paper pulp. In other words, the embossing device normally used for vinyl wallpaper is composed of an embossing roll with a concavo-convex pattern engraved on the surface and a back roll with a flat surface. Is formed. In the above technical proposal, a sheet containing paper pulp fibers and olefin fibers is heated in advance, and a concavo-convex pattern is formed by a normal embossing device used for the above-described vinyl wallpaper.

However, in the above-mentioned wall covering material using a sheet containing paper pulp fiber and olefin fiber, there is an advantage that the uneven pattern formed by the embossing device is less likely to lose its shape, but a sufficient uneven pattern with a sense of volume is obtained. When it is formed, the concave / convex pattern extends to the back surface, and if the sheet is thickened to prevent this, it becomes hard and lacks flexibility.

Moreover, as a wall covering material using a nonwoven fabric, for example, a punching nonwoven fabric made of organic fiber not containing chlorine is bonded to one side of a base paper for wallpaper with an adhesive, and then the embossing roll heated to a temperature at which the nonwoven fabric surface can be thermoformed There has been proposed a method of manufacturing a wallpaper in which a concavo-convex pattern is formed by pressure contact. The wallpaper obtained by this manufacturing method is soft and warm, and has excellent volume, but it uses a non-woven fabric in which long fibers are intertwined in a bulky state by a dry process. Workability is inferior and it is difficult to ensure stable quality. In addition, it has been proposed that the above-mentioned nonwoven fabric has a multilayer structure and the surface layer is formed more densely than the back layer. However, in this case as well, there is a limit as a dry process, and the cost increases as the density increases. However, the practicality is poor.
JP-A-9-31900 JP-A-10-96197

The present invention has been made paying attention to such problems in the prior art, and the problem is that there is no generation of harmful gases during combustion as seen in vinyl wallpaper, and there is a soft and voluminous feel. An object of the present invention is to provide a wall covering material having a concavo-convex pattern that is not easily deformed, and having excellent embossability, printability, and workability, and a method for manufacturing the same.

As a result of intensive studies to solve the above problems, the inventors of the present invention have made bamboo pulp fiber a softer paper that is bulky and superior in mechanical strength than wood pulp and other cellulosic fibers. Furthermore, the present inventors have found that a wall covering material that can achieve the above object can be obtained by combining with synthetic fibers, and the present invention has been completed here.

That is, the wall covering according to the present invention is a mixed paper made of bamboo pulp fiber and synthetic fiber,
It comprises a backing paper for wallpaper laminated on the back side of the mixed paper, and an uneven pattern is formed on the front side of the mixed paper by embossing.

The wall covering material includes a step of making a mixed paper made of bamboo pulp fibers and synthetic fibers, a step of laminating a backing paper for wallpaper on the back surface of the mixed paper, and the above-mentioned laminating paper backing paper for wallpaper on the back surface. Papermaking can be produced by a production method comprising a step of embossing by pressing an embossing roll against the surface side of the mixed papermaking paper through a heated embossing roll and a back roll having a flat surface. .

The wall covering of the present invention is based on a mixed paper based on bamboo pulp fibers, so that no harmful gas such as hydrogen chloride is generated during combustion, and the volume feeling of bamboo pulp fibers and It can provide a soft texture and even excellent mechanical strength.

In addition, by using thermoplastic synthetic fiber that melts during embossing as synthetic fiber blended with bamboo pulp fiber, the synthetic fiber melts and fuses during embossing, and the bond strength between the fibers is increased. As the concavo-convex pattern is formed, the concavo-convex pattern can be imparted with an effect of preventing deformation.

Furthermore, flame retardancy, water repellency, wet friction resistance, and antifouling properties can be improved by combining flame retardant treatment, water repellency treatment, formation of a synthetic resin coating layer, and these processes as necessary.

  FIG. 1 schematically shows a cross-sectional view of an embodiment of a wall covering according to the present invention, in which a backing paper 2 for wallpaper is laminated on the back surface of a mixed paper 1 made of bamboo pulp fibers and synthetic fibers, and the mixed paper An uneven pattern 3 is formed on the surface side of 1 by embossing.

In the present invention having such a configuration, bamboo pulp fibers are mixed with synthetic fibers to make a mixed paper, and by using this mixed paper as a main material, it is soft and excellent in volume and mechanical strength, and also has a low density. Thus, a wall covering material with good embossability can be obtained.

Bamboo pulp fibers used in the present invention are needle-like short fibers obtained by pulping bamboo, and those used for papermaking are preferably those having an average fiber length of 0.6 to 4.5 mm, 0.9 More preferably, it is -2.0 mm. When the fiber length of the bamboo pulp fiber is long, the printability of the obtained wall covering surface is inferior and it is difficult to make paper with a paper machine. When the fiber length is short, the strength of the mixed paper tends to be inferior.

As the synthetic fiber mixed with bamboo pulp fiber, any synthetic fiber other than those having chlorine in the molecule such as vinyl chloride can be selected, but a thermoplastic synthetic fiber having a low melting point is used. Thus, it can be melted at the time of embossing to increase the bonding force between the fibers, to improve the heat setting property, and to prevent the uneven pattern from being deformed. Typical examples of such low-melting thermoplastic synthetic fibers include olefin fibers such as polyethylene and polypropylene, EVA (ethylene vinyl acetate copolymer resin) fibers, low-melting polyethylene terephthalate fibers, and mixtures or composite fibers thereof. It is preferable to select one having a melting point of 80 to 160 ° C, particularly 110 to 140 ° C. If the melting point is less than 80 ° C., the workability during processing is affected, and if it exceeds 160 ° C., the fusion between fibers and the heat setting property tend to be difficult.

Synthetic fibers include a bimetallic structure in which a low-melting thermoplastic synthetic fiber and a high-melting thermoplastic synthetic fiber are bonded together, a core having a high-melting thermoplastic synthetic fiber as a core and a low-melting thermoplastic synthetic fiber as a sheath It is also possible to use a composite fiber such as a sheath structure. In particular, when using a composite fiber having a core-sheath structure, even if the low melting point sheath part melts during embossing, the fiber form of the high melting point core part remains, so that the texture of the core fiber can be given. As the core-sheath type composite fiber, for example, it has a thermoplastic polyethylene terephthalate fiber (hereinafter referred to as a high melting point polyester fiber) having a melting point of 255 to 260 ° C. in the core part, and a melting point of 125 to 135 ° C. as the sheath part. Thermoplastic polyethylene fibers, those having thermoplastic polyethylene terephthalate fibers (hereinafter referred to as low melting point polyester fibers) having a melting point in the range of about 110 to 160 ° C, or thermoplastics having a melting point of 165 to 173 ° C in the core portion A thermoplastic polyethylene fiber having a polypropylene fiber and a melting point of 125 to 135 ° C. as a sheath portion, an EVA (ethylene vinyl acetate copolymer) fiber having a melting point of 120 to 130 ° C., and the like can be mentioned.

The form of these synthetic fibers may be short fibers or long fibers as long as they can be produced by a paper machine, but it is desirable to select them within a range of 0.6 mm to 10 mm in consideration of printability.

The mixing ratio of bamboo pulp fiber and synthetic fiber in the mixed paper of bamboo pulp fiber and synthetic fiber is desirably 50:50 to 95: 5 in mass% ratio. When the mixing ratio of the synthetic fiber is less than 5% by mass, the surface strength is lowered, and the formed concavo-convex pattern is easily deformed. On the other hand, when the mixing ratio of the synthetic fibers exceeds 50% by mass, bamboo pulp fibers are reduced, and the embossing tends to be crushed and the volume feeling and soft texture tend to be impaired.

The mixed paper made of bamboo pulp fiber and synthetic fiber preferably has a density of 0.2 to 0.6 g / cm3, and more preferably 0.25 to 0.4 g / cm3. If the density is less than 0.2 g / cm 3, the surface of the mixed paper becomes rough and the printability deteriorates and the strength also decreases. On the other hand, when the density exceeds 0.6 g / cm 3, the texture of the mixed paper becomes hard and the thickness of the mixed paper tends to be insufficient, resulting in a lack of volume as a wall covering. Therefore, the basis weight of the mixed paper made of bamboo pulp fibers and synthetic fibers is preferably set to 50 g to 160 g / m 2 in consideration of printability, embossability, appropriate thickness, cost and the like.

When making a mixed paper of bamboo pulp fiber and synthetic fiber, a paper making aid conventionally used in an aqueous dispersion of raw material fibers mixed at a predetermined ratio, for example, a filler such as talc and kaolin, A paper material is prepared by blending a sizing agent, a paper strength enhancer, a fixing agent, an internal additive binder, a dimensional stabilizer, and the like, and paper is made by a conventional method using a paper machine.

The backing paper for wallpaper pasted on the reverse side of the mixed paper of bamboo pulp fiber and synthetic fiber has a function of improving workability and embossability when used as a wall covering material such as wallpaper. Typical backing paper for wallpaper includes plain paper, flame retardant paper, aluminum hydroxide paper, etc., starch-based, vinyl acetate resin, ethylene-vinyl acetate copolymer resin, acrylic system that does not generate harmful gases when burned Affixed using an emulsion type adhesive such as resin. In addition, the backing paper for wallpaper is a base paper that has a longer work time (open time) from the application of the adhesive for construction to the application of the wall covering to the wall surface, that is, the construction adhesive is made of the wall covering. It is preferable to select one that has been processed to prevent penetration into the interior and to slow the drying of the adhesive. Examples of the backing paper for wallpaper include those obtained by applying or impregnating an aqueous solution of an acrylic ester resin, an aqueous solution of a styrene-acrylic resin, or a water-soluble flame retardant such as guanidine sulfamate to which a wax is added. Can be mentioned.

The mixed paper with the backing paper for wallpaper on the back side is subjected to the formation of a pattern by printing on the front side, that is, a decorative process, if necessary. Examples of the cosmetic processing method include gravure printing, screen printing, flexographic printing, and the like, and these methods can be used alone or in combination. In addition, although it may be before embossing or after embossing when performing a decorative process, when performing a water-repellent process, it is preferable to perform before a water-repellent process.

For embossing to form a concavo-convex pattern, wallpaper backing paper was pasted on the back side between an embossing roll with a concavo-convex pattern engraved on the surface and a back roll such as a rubber roll or paper roll with a flat surface. The embossing roll is pressed against the surface side of the mixed paper through the mixed paper and then cooled. The difference from the embossing of vinyl wallpaper is that in embossing of vinyl wallpaper, the sheet side is heated and melted in advance and the embossing roll that has been cooled is pressed into contact, but in the present invention, the sheet side is not heated. Alternatively, the heated embossing roll is heated to such an extent that it does not soften, and is heated.

The embossing conditions, that is, the surface temperature, pressure, and processing speed of the embossing roll can be appropriately set according to the type of synthetic fiber constituting the mixed paper. The surface temperature of the embossing roll is usually set higher than the melting point of the low-melting thermoplastic synthetic fiber constituting the mixed paper and lower than the softening point of the high-melting thermoplastic synthetic fiber. When performing, it can also set higher than the softening point of a high-melting-point thermoplastic synthetic fiber, and generally setting to the range of 135-260 degreeC is preferable. The pressure is preferably 160 to 1200 N / cm, and the processing speed is preferably 10 to 60 m / min.

The wall covering material of the present invention can impart flame retardancy by performing a flame retardant treatment as necessary. The flame retardant treatment method includes making a mixed paper and then applying a flame retardant to the surface, dipping the mixed paper in a flame retardant solution and impregnating it by drying. Examples include a method of blending a flame retardant therein. Such a flame retardant treatment is preferably performed before the water repellent treatment described later applied to the surface of the mixed paper or a synthetic resin coating layer.

  As the flame retardant used for the flame retardant treatment, those not containing chlorine are preferable, and known flame retardants conventionally used for the flame retardant treatment of paper materials can be used. For example, flame retardants such as aluminum hydroxide, magnesium hydroxide, zirconium oxide, guanidine sulfamate, guanidine phosphate, guanidine sulfate, ammonium phosphate, calcium phosphate, sodium silicate, potassium silicate, and silicon borate can be used.

  It is preferable that the usage-amount of a flame retardant is 10-50 mass% by dry mass with respect to the mass of mixed paper. If it is less than 10% by mass, the desired flame retardancy will not be imparted, and if it exceeds 50% by mass, the strength of the wall covering will decrease, or depending on the flame retardant, it will become hard and the texture of the wall covering will be impaired.

The wall covering material of the present invention is subjected to a water-repellent treatment as necessary, or a synthetic resin coating layer is formed, or a water-repellent treatment is performed after the synthetic resin coating layer is formed to provide antifouling properties, water resistance,
It is possible to improve wet friction resistance and the like.

The water repellent treatment or the formation of the synthetic resin coating layer is appropriately selected according to the place where the wall covering is used, that is, the kind of dirt and the frequency of dirt. For example, there is no need to process places that are difficult to get dirty, such as ceilings or bedroom walls, but water-repellent treatment or formation of a synthetic resin coating layer is required for places that are relatively easy to get dirty, such as living walls. . Further, in places such as a washroom and a kitchen wall that are very dirty, formation of a synthetic resin coating layer and water repellent treatment are required.

When performing only the water repellent treatment on the surface of the wall covering material of the present invention, it is preferable to carry out it before and after forming the uneven pattern, that is, twice before and after embossing. The water-repellent treatment before embossing (the first water-repellent treatment) is performed by applying or transferring a silicon-based or fluorine-based resin coating solution. In addition to the effect of imparting water repellency to the wall covering material There is also an effect of improving the releasability of the embossing roll. This release effect is effective not only for improving product quality but also for increasing the processing speed during embossing.

  The water-repellent treatment after embossing (second water-repellent treatment) compensates for the spots of the first water-repellent treatment performed before embossing, and has a water-repellent effect with no spots on the surface of the wall covering. It is given. The coating liquid used for the second water-repellent treatment does not need to consider the effect of improving the releasability of the embossing roll. Among the resins having water-repellent performance or waterproof performance, silicone resin, fluorine resin, styrene-acrylic Selected from at least one resin selected from a resin, an acrylic resin, a wax, and the like, and the coating amount is preferably 0.2 to 20 g / m 2 in terms of dry mass, and preferably 0.5 to 10 g / m 2. More preferably. If the coating amount is less than 0.2 g / m 2, the required water repellent effect cannot be obtained, and if it exceeds 20 g / m 2, the cost increases and it becomes uneconomical.

  In addition, when performing water-repellent treatment, it is desirable to perform the decorative process by printing before the first water-repellent treatment.

Thus, the water repellent treatment imparts antifouling performance to the surface of the wall covering material, but only in the first water repellent treatment, a tear occurs in the water repellent layer due to contact with the embossing roll,
There is a possibility that sufficient water-repellent effect cannot be obtained. In the second water repellent treatment only,
A sufficient water-repellent layer cannot be formed as a whole due to the unevenness of the embossed pattern. Therefore, as described above, by performing the water-repellent treatment twice before and after the formation of the concave and convex pattern, a water-repellent layer without a tear can be formed, so that sufficient water-repellent performance can be obtained.

  In the wall covering material of the present invention, when the synthetic resin coating layer is formed on the surface of the mixed paper made of bamboo pulp fiber and synthetic fiber, the synthetic resin coating layer may be formed before or after the decorative processing by printing. Has a function of improving the antifouling property, water resistance and moisture friction resistance of the wall covering. In addition, when formation of a synthetic resin application layer is performed before the decorative process by printing, there exists a function which improves printability.

  Synthetic resins include acrylic ester resins, butadiene / styrene copolymers, butadiene / methyl methacrylate copolymers, styrene-acrylic resins, olefin resins, and waxes or inorganic powders as required. For example, those with endothermic dehydration such as aluminum hydroxide, magnesium hydroxide, various inorganic hydrates, silica as a matting agent, calcium carbonate, kaolin clay, talc, etc. that are usually used for papermaking It is also possible to use a compound obtained by mixing the above compound with these resins.

  The application of the synthetic resin is usually performed in-line or off-line after papermaking. However, when it is performed off-line, it may be performed after laminating wallpaper backing paper on the back surface of the mixed paper composed of bamboo pulp fibers and synthetic fibers. The coating amount of the synthetic resin is preferably 1 to 15 g / m 2 by dry mass, and more preferably 3 to 8 g / m 2. When the coating amount is less than 1 g / m 2, the desired improvement in wet friction resistance may not be achieved, and when it exceeds 20 g / m 2, the surface becomes hard and uneconomical, and the soft texture of bamboo pulp fibers tends to be impaired. Also seen.

Further, the wall covering material according to the present invention can further improve the antifouling property of the wall covering material by using a synthetic resin coating layer and a water repellent treatment in combination. In this case, unlike the case where only the water repellent treatment described above is performed, the synthetic resin coating layer is formed before forming the concave / convex pattern by embossing, and the water repellent treatment is performed after the synthetic resin coating layer is formed. It may be performed either before or after forming the concavo-convex pattern, or both.

  70% by mass of bamboo pulp fiber with an average fiber length of 0.94 mm, polyester fiber with a core-sheath structure with an average fiber length of 5 mm (high-melting polyester fiber with a core part having a melting point of 255 to 260 ° C., low-melting polyester with a sheath part having a melting point of 110 ° C. Fiber) A papermaking agent is prepared by blending an aqueous dispersion in which 30% by mass is uniformly mixed with a conventional papermaking aid necessary for papermaking, and a density of 0.33 g / cm3 and a basis weight of 100 g / m2 mixed paper was made.

  On the back side of this mixed paper, ordinary paper for wallpaper having a basis weight of 85 g / m2 as a backing paper for wallpaper is pasted together using an ethylene-vinyl acetate emulsion adhesive (trade name “Bond SP800” manufactured by Konishi Co., Ltd.) A wall covering material sheet having a thickness of 0.45 mm and a basis weight of 195 g / m 2 was obtained.

This wall covering material sheet is passed between an embossing roll engraved with a 0.45 mm depth stone pattern and a back roll having a flat surface, and the surface temperature of the embossing roll is 200 ° C. and the pressure (linear pressure) is 260 N / cm. Then, embossing was performed on the surface side of the sheet at a processing speed of 30 m / min, and a wall covering material having a thickness of 0.42 mm having the configuration shown in FIG. 1 was obtained.

70% by mass of bamboo pulp fiber with an average fiber length of 0.94 mm, polyester fiber with a core-sheath structure with an average fiber length of 5 mm (high-melting polyester fiber with a core part having a melting point of 255 to 260 ° C., low-melting polyester with a sheath part having a melting point of 110 ° C. Fiber) An aqueous dispersion in which 30% by mass is uniformly mixed is mixed with a conventional papermaking aid necessary for papermaking to prepare a paper stock, and a density of 0.33 g / cm3 and a basis weight of 83 g / m2 mixed paper was made. Furthermore, with respect to 100 parts by mass of this mixed paper, guanidine sulfamate as a flame retardant was impregnated so as to have a dry mass of 20 parts by mass, dried and subjected to flame retardant treatment, a density of 0.41 g / cm 3, and a basis weight of 100 g / An m2 mixed paper was obtained.

On the reverse side of this mixed paper, flame retardant paper for wallpaper having a basis weight of 85 g / m2 as a backing paper for wallpaper is bonded using an ethylene-vinyl acetate emulsion adhesive (trade name “Bond SP800” manufactured by Konishi Co., Ltd.). A wall covering material sheet having a thickness of 0.42 mm and a basis weight of 195 g / m 2 was obtained.

This wall covering material sheet is passed between an embossing roll engraved with a 0.45 mm depth stone pattern and a back roll having a flat surface, and the surface temperature of the embossing roll is 200 ° C. and the pressure (linear pressure) is 260 N / cm. The surface of the sheet was embossed at a processing speed of 30 m / min to obtain a 0.40 mm wall covering.

  After printing on the surface of the wall covering material sheet in Example 1, a water-based silicone water repellent was applied to a dry weight of 2 g / m 2 and dried to give the first water repellent treatment. A wall covering material sheet having a thickness of 0.45 mm and a basis weight of 197 g / m 2 was obtained.

  After embossing this wall covering material sheet in the same manner as in Example 1, a silicon-based water repellent was further applied to a dry weight of 2 g / m 2 to perform a second water repellent treatment. The wall covering material having a thickness of 0.42 mm was obtained.

After the surface of the wall covering material sheet in Example 1 is printed, a water-based styrene-acrylic resin coating is applied to a dry weight of 4 g / m 2 and dried to form a synthetic resin coating layer. A wall covering material sheet having a thickness of 0.45 mm and a basis weight of 200 g / m 2 was obtained.

The wall covering material sheet was embossed in the same manner as in Example 1 to obtain a wall covering having a thickness of 0.42 mm.

After applying a water-based styrene-acrylic resin coating on the surface of the wall covering material sheet in Example 1 to a dry weight of 4 g / m 2 and drying to form a synthetic resin coating layer, makeup by printing Processing was performed to obtain a wall covering material sheet having a thickness of 0.45 mm and a basis weight of 200 g / m 2.

The wall covering material sheet was embossed in the same manner as in Example 1 to obtain a wall covering having a thickness of 0.42 mm.

After embossing the wall covering material sheet obtained in Example 4 in the same manner as in Example 1, a silicon-based water repellent was further applied at a dry weight of 2 g / m 2 to make the material repellent. Water treatment was performed to obtain a wall covering material having a thickness of 0.42 mm.

  Except that the mixed paper in Example 1 was changed to paper composed of 100% by mass of bamboo pulp fiber, the same as in Example 1, pasting of backing paper for wallpaper on the back surface, thickness 0.45mm, basis weight 195g A wall covering material sheet of / m 2 was obtained.

This wall covering material sheet was embossed in the same manner as in Example 1 to obtain a wall covering having a thickness of 0.0.44 mm.

  In the same manner as in Example 1, except that the mixed paper in Example 1 was changed to a paper composed of 100% by mass of polyester fiber having a core-sheath structure, the backing paper was bonded to the back surface with a thickness of 0.40 mm, A wall covering material sheet having a basis weight of 195 g / m 2 was obtained.

This wall covering material sheet was embossed in the same manner as in Example 1 to obtain a wall covering having a thickness of 0.0.30 mm.

  For the wall coverings obtained in Examples 1 to 8, embossability, printing processability, volume feeling, flame resistance, moisture friction resistance, shape loss, water repellency, antifouling properties, and texture are as follows. According to the evaluation.

<Evaluation of embossability>
The uneven pattern formed on the surface of the wall covering material was visually observed and evaluated according to the following criteria.
◯: An embossed pattern with excellent unevenness was formed.
Δ: An embossed pattern was formed, but the feeling of unevenness was poor.
X: There was almost no unevenness and the feeling of unevenness was poor.

<Evaluation of printing processability>
The printed state of the wall covering material sheet was visually observed, and the printability and the stability of the printed state were compared with a standard sample (printed sample of vinyl wallpaper).
○: Almost the same as the standard sample.
○ △: Printability is slightly inferior to the standard sample.
Δ: Inferior to the standard sample, but can be used.
×: Very inferior to the standard sample and cannot be used.

<Evaluation of volume>
The thickness of the convex part of the wall covering material was measured and judged by the difference (decrease rate) from the thickness before embossing.
○: The reduction rate of thickness was less than 20%.
(Triangle | delta): The reduction rate of thickness was 20% or more and less than 35%.
X: The reduction rate of thickness was 35% or more.

<Evaluation of flame retardancy>
The wall covering was evaluated for flame retardancy according to the standard of JIS A 1322 (1966).
○: Flame retardancy was excellent.
(Triangle | delta): The flame retardance was inadequate.
X: Almost no flame retardancy.

<Evaluation of wet friction resistance>
The wall covering was subjected to a wet friction test based on the test method of JIS A 6921 (2003), and the surface condition after 25 times of friction was visually observed and evaluated according to the following criteria.
○: No particular change was observed in the surface state.
○ △: The surface appears to be slightly shaved.
Δ: The surface was shaved and paper dust was generated.
X: The surface was shaved and the printed layer was removed.

<Evaluation of shape loss>
Immerse the wall covering in water for 30 minutes. Immediately thereafter, the wall covering material surface is subjected to 5 reciprocating rollers with a construction roller, and the change in the uneven pattern is visually observed. The results were evaluated according to the following criteria.
○: No change was observed in the uneven pattern.
(Triangle | delta): The uneven | corrugated pattern was crushed and the shape changed.
X: The uneven pattern was not crushed.

<Evaluation of water repellency>
After 0.1 cc of water colored with a dye was dropped on the surface of the wall covering with a dropper, the time until water penetrated was measured, and the result was evaluated according to the following criteria.
○: Time until water permeates is 10 minutes or more.
○ △: Time until water permeates is 5 minutes or more and less than 10 minutes.
Δ: Time until water permeates is 1 minute or more and less than 5 minutes.
X: Time until water permeates is less than 1 minute.

<Evaluation of antifouling properties>
The dirt created assuming dust dirt is rubbed against the surface of the wall covering material, left to stand for 24 hours, wiped off with a cloth soaked with water, and the state of dirt removal is visually observed. The results were evaluated according to the following criteria.
○: No dirt remains.
○ △: Almost no dirt remains.
Δ: Some dirt remains.
X: A considerable amount of dirt remains.

<Evaluation of texture>
The softness and surface touch of the wall covering were evaluated according to the following criteria.
○: The wall covering itself is soft and the surface touch is also smooth.
Δ: The wall covering itself is soft, but the surface touch is cluttered.
X: The wall covering itself is hard and the surface touch is also sticking.

As shown in Table 1, the wall coverings of Examples 1 to 6 of the present invention have embossability,
The printing processability, volume feeling, shape loss, and texture were all excellent. In addition, other functionalities and physical properties can be obtained by combining flame retardant treatment, water repellent treatment, formation of synthetic resin coating layer, and combination of synthetic resin coating layer and water repellent treatment as necessary. Proven. For example, Example 2 for flame retardancy, Example 4, Example 5, Example 6 for moisture rub resistance, and Example 3, Example 4, Example 5, for water repellency and antifouling properties Excellent results are shown with the wall covering of Example 6.

  On the other hand, Example 7 using paper made only of bamboo pulp fibers is inferior in embossability, moisture rub resistance and shape loss, and Example 8 using paper made only of synthetic fibers has a volume feeling. There was a decline in the texture and poor texture.

  The use of bamboo pulp as non-wood helps to preserve the environment, has the volume and soft texture of bamboo pulp fibers, and does not generate harmful gases such as hydrogen chloride during combustion. Applicable to gentle wall covering applications.

It is typical sectional drawing which shows the embodiment of the wall covering material of this invention.

Explanation of symbols

1: Mixed paper 2: Backing paper for wallpaper 3: Uneven pattern

Claims (14)

  A wall covering material comprising a backing paper for wallpaper laminated on the back surface of a mixed paper made of bamboo pulp fiber and synthetic fiber, and having an uneven pattern formed by embossing on the surface side of the mixed paper.   The wall covering material according to claim 1, wherein a mixing ratio of bamboo pulp fibers and synthetic fibers in the mixed paper is 50:50 to 95: 5 in terms of mass%.   The wall covering material according to claim 1 or 2, wherein the synthetic fiber is a thermoplastic synthetic fiber having a melting point that melts during embossing.   The wall covering material according to any one of claims 1 to 3, wherein a surface of the mixed paper is subjected to a decorative process by printing.   The wall covering material according to any one of claims 1 to 4, wherein the mixed paper is flame-retardant treated.   The wall covering material according to any one of claims 1 to 5, wherein a surface of the mixed paper is subjected to water repellent treatment.   A synthetic resin coating layer is formed on the surface of the mixed paper, and an uneven pattern is formed on the surface side of the synthetic resin coating layer by embossing in which the mixed paper and the synthetic resin coating layer are integrated. The wall covering material according to any one of claims 1 to 5.   The wall covering material according to claim 7, wherein a surface of the synthetic resin coating layer is subjected to water repellent treatment.   The step of making a mixed paper made of bamboo pulp fiber and synthetic fiber, the step of laminating the backing paper for wallpaper on the back side of the mixed paper, and the mixed paper having the backing paper for wallpaper laminated on the back side were heated. A method for producing a wall covering material comprising a step of embossing by pressing an embossing roll against the surface side of the mixed paper through a gap between an embossing roll and a back roll.   The method for manufacturing a wall covering material according to claim 9, further comprising a step of performing a decorative process by printing on a surface of the mixed paper.   The method for producing a wall covering material according to claim 9 or 10, further comprising a step of subjecting the mixed paper to a flame retardant treatment.   The method for producing a wall covering material according to any one of claims 9 to 11, further comprising a step of water-repellent treatment of the surface of the mixed paper.   10. The method according to claim 9, further comprising a step of forming a synthetic resin coating layer on a surface of the mixed paper, and embossing the mixed paper having a wallpaper backing paper laminated on the back surface and the synthetic resin coating layer formed on the surface. The manufacturing method of the wall covering material of any one of -11.   The method for producing a wall covering material according to claim 13, further comprising a step of water-repellent treatment of the surface of the synthetic resin coating layer.

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