JP2017186690A - Wall paper and manufacturing method of wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wall paper that is highly designable and functions as a blockboard on which direct writing with a chalk and deleting can be done.SOLUTION: A wall paper WP for writing with chalk has a lining layer 1 that is attached to a wall surface, a synthetic resin layer 2 that is made from thermoplastic resin and laminated on the lining layer, and a stain-proof layer 3 that is laminated on the synthetic resin layer. The wall paper has uneven surface formed of many spherically convex chalk scraping part 7 on the surface and concave chalk holding parts 8 formed between the chalk scraping parts 7. As the maximum height of the chalk scraping part 7 is 160 μm, the wall paper is excellent in writing, deleting and abrasion resistant properties.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wallpaper and a method for producing the wallpaper, and more particularly to a wallpaper and a method for producing the wallpaper that can be written and erased with chalk.

  Conventionally, there is a whiteboard sheet that can be affixed to a wall and written and erased with a water-based board marker. In addition, there was a wallpaper with antifouling treatment that made it erasable against graffiti with crayon or oily / water-based felt pen. If such a wallpaper is used, it is possible to erase characters and pictures even if they are drawn with crayons or oil-based / water-based felt pens.

  By the way, in recent years, not only a memo board but also a blackboard with an antique atmosphere having a high design as a display device capable of rewriting a unique painting with chalk has been attracting attention again. In the description of the present application, for the sake of convenience, the “blackboard” means a surface having a surface that can be written / erased by chalk, and the color is not limited to “black”.

  With the above-mentioned antifouling wallpaper, characters and pictures drawn with crayons and oil-based / water-based felt pens can be erased, but depending on the chalk, it is difficult to draw letters and pictures in the first place. In order to draw warm letters and pictures with chalk, a blackboard was absolutely necessary.

  However, the conventional off-the-shelf blackboard has been pursued for practicality and functionality because its purpose is limited to school classes. For this reason, a steel plate of a prescribed size is polished to a high degree of smoothness, and a blackboard paint is applied and affixed to a wooden frame to form a panel, but the size standard has been determined. Therefore, there was no freedom with respect to the size according to the wall surface to be installed. Therefore, if a large size is specially ordered according to the wall surface, the weight becomes large, the equipment for preventing the fall becomes large, and the cost becomes large.

  It is also conceivable to treat the wall surface itself in the same manner as the blackboard by applying the blackboard paint directly to the wall surface. However, even if the wall surface is painted with the same blackboard paint as the blackboard, if there are fine irregularities on the surface, there is a problem that not only the beauty is lost but also the writing property is hindered. There was also a problem that the drawn letters and the chalk of the picture entered the unevenness and did not disappear neatly by erasing the blackboard. On the other hand, it is not practical to smooth the wall surface to be constructed like a blackboard because there is a problem that it takes a great deal of cost and labor.

  Therefore, as in Patent Document 1, the lower surface of the double-sided adhesive is covered with a release paper that forms the bottom layer, a plastic film is bonded to the upper surface of the double-sided adhesive, and blackboard paint is laminated on the upper surface of the plastic film. Thus, a blackboard sheet was proposed in which the entire sheet was a flexible sheet that could be wound.

Utility Model Registration No. 3149866

  However, this blackboard sheet was originally based on the premise that the existing blackboard is to be replaced, and can be used as a new blackboard surface by pasting it on the flat surface of the existing blackboard. In the case of pasting on the surface, there is a problem that the unevenness of the base is reflected or wrinkles approach unless the base is made very smooth.

  In addition, no matter how smooth the groundwork is, it is possible to ensure the writing property, but since the blackboard paint is used on the premise of the blackboard used at school etc., the color is limited to dark green etc. from the viewpoint of visibility. Lack of design as a decorative material. In addition, the surface is flat and lacks design changes.

  Accordingly, the present invention provides a wallpaper and a method for producing the wallpaper, which is a wallpaper that can be easily installed and has a high designability, but also has a function that can be directly written and erased with chalk as with a blackboard. The purpose is to do.

  In order to solve the above-mentioned problems, in the wallpaper for writing with chalk according to the present invention, a backing layer for adhering to a wall surface, a synthetic resin layer made of a thermoplastic resin laminated on the backing layer, and the synthetic resin A wallpaper having an antifouling layer laminated on the surface of the layer, and formed on the surface of the wallpaper between a chalk scraping portion that is a large number of spherical convex portions and the chalk scraping portion. The present invention is characterized in that it has an uneven surface formed from a choke holding portion which is a concave portion, and the maximum height of the choke scraping portion of the chalk scraping portion is 100 to 340 μm.

  Here, the “maximum height” refers to a difference in thickness direction between a chalk scraping portion that is a spherical convex portion and a choke holding portion that is a concave portion formed between the chalk scraping portions. “Maximum height” corresponds to the maximum height Rz according to JIS B 0601-2013.

Desirably, the maximum height is 160 to 200 μm.
In the present invention, preferably, the antifouling layer is in a state in which an ethylene-vinyl alcohol copolymer resin (EVOH) film having a thickness of 10 to 20 μm is laminated.

In the present invention, desirably, the width of the chalk scraping portion is 1 to 5 times its maximum height.
In the method for producing wallpaper for writing with chalk according to the present invention, the method for producing wallpaper for writing with chalk, comprising the step of laminating a synthetic resin layer made of a thermoplastic resin on a backing layer for adhering to a wall surface And a step of laminating an antifouling layer on the surface of the synthetic resin layer, and a large number of spherical convex portions on the laminated synthetic resin layer and antifouling layer so that the maximum height is 100 to 340 μm. The gist of the invention is that it includes a step of forming an uneven surface including a certain chalk scraping portion and a choke holding portion which is a recess formed between the chalk scraping portions.

In the present invention, preferably, the step of forming the uneven surface is by embossing.
In the present invention, preferably, the embossing is performed by forming a plurality of mortar-shaped concave surfaces by causing a cylindrical side surface or a spherical metal tool to impact in a non-directional direction on the surface of a metal embossing roller. The chalk scraping portion that is a large number of spherical convex portions on the surface of the wallpaper, and the chalk holding portion that is a recess formed between the chalk scraping portions And form.

  In the present invention, preferably, the embossing is performed by reversing an original pattern on which a mortar-shaped concave surface is formed by irradiating a metal mill roller surface with a cylindrical side or spherical metal tool in a non-directional direction. Create a shape, press the mill roller against a metal roller, transfer the embossed pattern to create an embossed roller, and transfer the embossed roller to the wallpaper. Forming a choke scraping portion and a choke holding portion being a recess formed between the choke scraping portion.

  ADVANTAGE OF THE INVENTION According to this invention, although it is a wallpaper which can be installed easily and can be provided with high designability, it can be used as a wallpaper provided with the function which can be directly written and erased with chalk like a blackboard.

  Therefore, it is easy to manufacture and can be manufactured at low cost. Just by sticking it on the wall, it can be used not only for the function of drawing and erasing characters and pictures on the wall, but also for the interior. There is an unprecedented novel effect that high design properties can be imparted.

The cross section of the wallpaper of this invention, and a partial enlarged view. The perspective schematic diagram which shows the embossing by an embossing roller. The partial cross-sectional enlarged view of the embossing by the embossing roller in AA part. (A) An example of the front-end | tip part of the tool which shape-processes the surface of an embossing roller, (b) Other examples of the front-end | tip part of the tool which shape-processes the surface of an embossing roller. The schematic diagram which shows the state of writing by the chalk in an Example. The schematic diagram which shows the state of writing by the chalk in a comparative example. The schematic diagram which shows the state of writing by the chalk in another comparative example. The schematic diagram which shows the state of writing by the chalk in the grain-type wallpaper of a conventional manufacturing method. The table | surface which shows the result of having compared the Examples 1-5 of this embodiment, and Comparative Examples 1-4, and having tested abrasion resistance, writing property, and erasability. The table | surface which shows the result of having tested the influence which the mixing | blending of a foaming agent has on abrasion resistance, writing property, and erasability. The table | surface which shows the result which tested the influence which the mixing | blending of a plasticizer has on coating property, abrasion resistance, writing property, and erasability.

Hereinafter, an embodiment of the wallpaper embodying the present invention will be described with reference to FIGS.
FIG. 1 shows a schematic cross section of a wallpaper WP of the present invention and a partially enlarged view thereof. The wallpaper WP of the present embodiment includes a backing layer 1 adhered to a wall surface, a synthetic resin layer 2 made of a thermoplastic resin laminated on the backing layer 1, and an antifouling layer laminated on the surface of the synthetic resin layer 2. 3.

(Backing layer 1)
The backing layer 1 has a surface to be attached to a wall surface in the wallpaper WP, and a synthetic resin layer 2 is laminated on the opposite side.

  The backing layer 1 is affixed to the wall surface of the finished wallpaper WP, so that it retains before it is fixed to an adhesive, for example, an adhesive made of water-soluble synthetic resin starch, or solidifies, both in terms of material and structure. Later adhesion is required.

Moreover, since it becomes the base which forms the synthetic resin layer 2, the thing with favorable adhesiveness with the synthetic resin layer 2 is requested | required also from material and structure.
Therefore, for example, a sheet made of pulp paper having a thickness of 0.1 to 0.2 mm, and 0.2 mm in the embodiment can be suitably used. Specifically, trade name NI-65, which is a wallpaper base paper manufactured by Nippon Paper Industries Co., Ltd., can be mentioned.

  In addition, a material is not limited to the product made from a pulp, In order to improve a dimensional accuracy and intensity | strength, the product made from synthetic resin, natural fibers other than a pulp, and these combined are also preferable. For example, those containing about 10 to 40% of a polyester-based resin are preferable, and specific examples include synthetic resin / pulp mixed paper manufactured by GLATFELTER in Dresden, Germany.

(Synthetic resin layer 2)
The synthetic resin layer 2 is a portion forming the main body of the wallpaper WP and is laminated on the backing layer 1. In the embodiment, since the synthetic resin layer 2 is applied and laminated on the backing layer 1 in a heated and melted state, a material having high adhesion to the backing layer 1 is required.

Moreover, since it is requested | required that embossing is possible after lamination | stacking, a thermoplastic resin is desirable.
For example, a vinyl chloride resin or the like laminated on the backing layer 1 with a thickness of 0.2 to 0.4 mm and 0.4 mm in the embodiment is preferably used. Specifically, the product name “Lyuron Paste (registered trademark) K72Z” manufactured by Tosoh Corporation mainly composed of vinyl chloride resin can be used.

(Additive)
In addition, various additives such as a colorant, a plasticizer, calcium carbonate, titanium oxide, a stabilizer, and a foaming agent are added according to the state of the wall surface to be attached, the place of use, the purpose, and the design.

For example, plasticizers and foaming agents vary in the elasticity and hardness of the product depending on the amount of plasticizer added, and affect the wear resistance against writing with chalk and the writing and erasing properties.
(Foaming agent)
FIG. 10 is a table showing the results of testing the influence of the blending of the foaming agent on the wear resistance, writing property and erasability. As a premise of the test, a comparison was made in the state of wallpaper WP provided with the antifouling layer 3 and embossed so that the maximum height of the chalk scraping portion 7 was 161.6 μm.

  The foaming agent is a material that generates bubbles by heating to produce a plastic foam. There are two types of foaming agents, one that decomposes by heating to generate nitrogen gas and the other that expands by heating. In the embodiment, for example, an organic thermal decomposition type foaming agent mainly composed of azodicarbonamide manufactured by Otsuka Chemical Co., Ltd., product name “Uniform (registered trademark) AZ Ultra # 1050i” is used as the foaming agent.

  As for the foaming agent, if the expansion ratio is too large, the foaming agent becomes soft, the chalk scraping part 7 is easily bent, the writing pressure is lowered, the writing property and the erasing property are lowered, and the wear resistance is lowered.

  Therefore, the plasticizer 50 phr, calcium carbonate 50 phr, titanium oxide 15 phr, stabilizer 2 phr as the weight part 100 of the vinyl chloride resin, the amount of the foaming agent is changed in the range of 0 to 4 phr in increments of 0.5 phr, and the addition amount is changed. Evaluation was made on wear resistance, writing property, and erasability.

  The abrasion resistance was evaluated by an in-house test method. The method uses a Gakushin type tester used to define the surface strengthening performance of the Wallpaper Industry Association, evaluates the surface by applying a load of 400 g to a friction element (metal nail) defined in the SV standard and scratching the product. Those that were not torn were marked as good. The wallpaper product standard (SV standard: Standard Value) is a voluntary standard established by the Wallpaper Industry Association.

Writability was evaluated in accordance with the “JIS S 6007 Blackness Test”. 1: Poor to 10: As good, 10 or more grades, 8 or more was accepted.
Specifically, first lay the chalk sideways, lightly rub the sample evenly, wipe it well with a blackboard wipe with a good drop of powder, and then sample the square line of about 50 mm vertically and horizontally written normally Whether or not the line is uneven was determined by visual observation according to the JIS standard of the blackboard when viewed from a position 1 m away from the center. Further, it was determined whether the line was clear when viewed from a position 8 m away.

The erasability was determined in accordance with the same “JIS S 6007 Blackness Test”. 1: Poor to 10: As good, 10 or more grades, 8 or more was accepted.
Specifically, when the line written in the evaluation of the ease of applying a black ink is normally erased with a blackboard wiper that has been well wiped off, it is written on the sample surface when viewed from a position 1 m away from the sample surface. Whether or not there were traces and erase unevenness was determined visually according to the JIS standard for blackboards.

As a result, when the weight part of the foaming agent was in the range of 0 to 2.0 phr, the abrasion resistance, writing property and erasability were good.
On the other hand, when the foaming agent was 2.5 phr or more by weight, the expansion ratio was high, the product thickness was increased, and the wear resistance, writability and erasability were reduced.

(Plasticizer)
FIG. 11 is a table showing the results of testing the effect of plasticizer blending on coating properties, abrasion resistance, writing properties, and erasability. As a premise of the test, the antifouling layer 3 was provided, and the chalk scraping portion 7 was compared in the state of wallpaper embossed so that the maximum height of the chalk scraping portion 7 was 161.6 μm.

  The plasticizer is added to give flexibility to the vinyl chloride resin of the synthetic resin layer 2 of the wallpaper WP or to facilitate processing. As the plasticizer, an ester synthesized from an acid and an alcohol is generally used. In the embodiment, DINP (diisononyl phthalate) is used. As another example of phthalic acid, DEHP (DOP) / bis (2-ethylhexyl) phthalate can also be used. As an acid other than phthalic acid, adipic acid, trimellitic acid and the like can also be used.

  With respect to the plasticizer, as shown in FIG. 11, the weight part 100 of the vinyl chloride resin is 50 phr calcium carbonate, 15 phr titanium oxide, 2 phr stabilizer, 1 phr foaming agent, and only 5 phr in the range of 30 to 70 phr plasticizer. The coating amount, wear resistance, writing property and erasability were evaluated by changing the addition amount in steps.

As for the evaluation method, regarding the coating property, a coating that does not cause coating unevenness or streaks when applied to the backing paper was evaluated as good.
The method for determining the wear resistance, writing property and erasability is as described in the description of the foaming agent.

As for the coating property, when the plasticizer is 35 parts by weight or less, uneven coating or streaks may occur when applied to the backing paper.
As for the wear resistance, the wear resistance is lowered when the plasticizer has a weight part of 65 phr.

Regarding the writing property and erasability, the plasticizer was good in the range of 30 to 70 phr.
As a result, the amount of plasticizer added was 40 to 60 phr, and the coating property, abrasion resistance, writing property and erasability were all good.

(Coloring)
In addition, since the antifouling layer 3 can be selected basically transparent, by coloring the synthetic resin layer 2 with a colorant, a free color different from the conventional blackboard or blackboard paint can be selected. In addition to functionality such as recognizability, it is also desirable to have a color tone that also has a design that matches the interior as wallpaper.

  The entire synthetic resin layer 2 may be colored by mixing a coloring agent, or may be colored on the surface by printing or the like, and a printed embossable synthetic resin film may be laminated on the surface. Good. For example, it is also preferable that the surface is made of wood grain so that the design is such that letters and pictures are drawn with chalk on a natural wooden board.

(Change example of synthetic resin layer)
The thermoplastic resin is not limited to a vinyl chloride resin, and an ethylene / vinyl acetate copolymer (EVA) resin, a polyethylene resin, an acrylic resin, or the like may be used as long as it is a thermoplastic resin that can be embossed. it can.

Furthermore, it is not limited to 100% resin, and in order to enhance the design properties such as the texture, it is possible to add plant fibers and the like within a range where coating and embossing are possible and writing performance does not deteriorate.
Further, the synthetic resin layer 2 is not limited to those which are melted and applied, and a calendar method or an extrusion method may be used, and a synthetic resin sheet manufactured in advance is laminated on the backing layer 1 with an adhesive. It may be bonded or heat welded. In this case, it is also desirable to give a color or a pattern to the surface in advance by printing or the like.

(Anti-fouling layer 3)
The antifouling layer 3 is a surface on which the chalk CH is directly written. If the antifouling layer 3 is not provided and writing is performed directly on the embossed synthetic resin layer 2 such as vinyl chloride resin, the wear resistance is remarkably inferior, and repeated writing and erasing cannot be performed. Moreover, even if it has writability, erasability will be remarkably inferior.

In the case of erasing characters drawn with chalk, it is desirable that the chalk powder can be easily removed with a dry blackboard eraser, cloth, or a cloth moistened with water.
Therefore, it is conceivable to provide the antifouling layer 3 in order to improve wear resistance and erasability. However, if the antifouling layer 3 is a flat conventional antifouling layer 3 without embossing, writing with chalk is possible. Will be difficult.

  In this embodiment, in order to solve such a contradictory problem, the antifouling layer 3 is provided to enhance wear resistance and ensure practicality. At the same time, the writing ability is improved by facilitating the adhesion of chalk with a specific shape by embossing. On the other hand, these problems are solved by improving the erasability by wiping with a resin having antifouling properties.

  Since the antifouling layer 3 of the embodiment is laminated together with the synthetic resin layer 2 and deformed by embossing, the antifouling layer 3 is required to be a thermoplastic material having high adhesion to the synthetic resin layer 2 and capable of being thermally deformed. The

Furthermore, since writing and erasing with chalk are repeated, high wear resistance and impact resistance that are difficult to cause surface peeling are also required.
In the present embodiment, the antifouling layer 3 may be preferably an ethylene-vinyl alcohol copolymer resin (EVOH) film having a thickness of 10 to 20 μm, preferably 12 to 15 μm. Specifically, a film having a thickness of 12 μm and a product name “EVAL FILM (registered trademark) HF-ME12” manufactured by Kuraray Co., Ltd. is used.

  This ethylene-vinyl alcohol copolymer resin (EVOH) film is preliminarily formed with an adhesive layer 4 to which a heat-sensitive adhesive having a thickness of 2 μm is applied, and is bonded to the synthetic resin layer 2 in accordance with embossing. Can be processed.

(Erasability)
The continuous writing test using chalk was evaluated by the following method.
As a premise, the synthetic resin layer 2 is made 100 parts by weight of vinyl chloride resin, the plasticizer is 50 phr, the calcium carbonate is 50 phr, the titanium oxide is 15 phr, the stabilizer is 2 phr, the foaming agent is 1 phr, the antifouling layer 3 is laminated, and the chalk scraping part In the wallpaper WP embossed so that the maximum height is 161.3 μm, draw a 10 cm line using chalk according to JIS S 6009 and wipe it off with blackboard eraser after 50 times of writing and erasing The state of unevenness was determined. As a result, excellent erasability was exhibited.

(Surface enhancement performance)
The antifouling layer 3 composed of an ethylene-vinyl alcohol copolymer resin (EVOH) film has a stronger surface and higher wear resistance and impact resistance than a normal wallpaper without the antifouling layer 3. It has gained.

  For the evaluation of the surface enhancement performance, similar samples were evaluated in accordance with “Surface Enhancement Wallpaper Performance Regulations” established by the Wallpaper Industry Association as a test method. The result was equivalent to the fifth grade, “No change at first glance”.

  It was also evaluated by our own testing method. The method uses a Gakushin type tester used to define the surface strengthening performance of the Wallpaper Industry Association, scratches the product with a load of 400 g with a friction element (metal nail) defined in the SV standard, and reciprocates up to 100 times. And evaluated by the number of reciprocations when the backing paper started to appear.

As a result, in this example, the average of 6 times in the vertical direction was 65.5 times, and the average of 6 times in the horizontal direction was 61.8 times, and high evaluation was obtained.
(Stain prevention performance)
For the anti-smudge performance, similar samples were evaluated in accordance with the SV standard “stain prevention performance test”.

In the SV standard "stain prevention performance test", as an evaluation of the dirt prevention performance,
1. The performance of the anti-smudge wallpaper refers to the anti-smudge performance of a wallpaper in which a film for anti-stain performance is bonded to the surface.

  2. Contaminants (coffee, soy sauce, crayon, water-based sign pen) are attached, and after 24 hours, the wiped product is visually determined. Wipe off coffee and soy sauce with water, and crayon and water-based pen with a neutral detergent.

3. The part from which the dirt has been wiped off is determined as a grade 1 to 5 by using a gray scale for contamination according to JIS L0805.
4). As a result, the wallpaper WP on which the antifouling layer 3 of the present embodiment was laminated satisfied the criteria of the “grade 5 in which no stain remains” or the grade 4 in “no stain remains”.

(Non-combustible and semi-incombustible performance)
In addition, the wallpaper WP which laminated | stacked the antifouling layer 3 of this embodiment can also be made into the wallpaper which satisfy | fills the incombustible and semi-incombustible performance based on the technical standard of the Building Standard Law enforcement order.

(Another example of antifouling layer)
The antifouling layer 3 is not limited to ethylene-vinyl alcohol copolymer resin (EVOH), and examples thereof include polypropylene (PP) resin, polyethylene (PE) resin, fluorine resin, acrylic resin, and the like. Can also be used.

Alternatively, an adhesive may be applied to the synthetic resin layer 2 in advance to form the adhesive layer 4, and the adhesive layer 4 may be laminated and pasted.
The antifouling layer 3 is not limited to a film-like one, and may be formed by coating or applying a liquid one. In this case, coating or the like may be performed after embossing depending on the material, or embossing may be performed after coating or the like.

(Embossing)
FIG. 2 shows an example of the embossing roller 5 used in the embossing process of this embodiment. The surface of the synthetic resin layer 2 of the wallpaper WP is laminated and bonded to the antifouling layer 3 by embossing, and an embossed shape is given together with the antifouling layer 3. The embossing of the wallpaper WP is to press an original pattern formed on an embossing roller 5 made of a metal roller against a heated thermoplastic resin sheet and transfer the original pattern to the sheet to form an embossed pattern. is there.

The embossing roller 5 is configured as a cylindrical roller having a diameter of about 120 cm.
As the material of the embossing roller 5, for example, iron: SCM steel, die steel, etc., aluminum: JIS7075, JIS5052, and the like are used. Also, duralumin, copper, brass, etc. are selected based on the hardness, durability, thermal conductivity, etc. according to the object to be embossed, and in this embodiment, iron-based ones are used.

  Further, the embossing roller 5 is subjected to a surface treatment in consideration of impact resistance, wear resistance, suppression of plastic deformation, promotion of release, and the like. As the surface prescription, for example, in the case of iron, metal plating such as chromium is mainly used, and other examples include vacuum quenching, tuftride treatment, and nitriding treatment. Moreover, in an aluminum system, alumite processing and fluororesin processing are mentioned. In the surface treatment of the iron-based embossing roller 5 of this embodiment, chrome plating is applied.

  In the present embodiment, embossing is performed using a metal cylindrical embossing roller 5 as shown in FIG. The embossed roller 5 on which the original pattern of the embossed pattern is formed and the pressure roller 6 disposed so as to face the embossed pattern at a predetermined interval are nipped while applying a certain pressure to the heated wallpaper WP to transfer the embossed pattern. .

  FIG. 3 is an enlarged partial cross-sectional view of embossing by an embossing roller at the AA portion in FIG. 2. In FIG. 3, the left-right direction on the paper is the rotational axis direction. The upper embossing roller 5 is engraved with an original pattern on which a concave portion 5a and a convex portion 5b that are reversed from the embossed pattern of the wallpaper WP are formed. While the embossing roller 5 rotates in the front-rear direction (front side in the figure), the original pattern engraved on the embossing roller 5 is transferred to the wallpaper WP on the synthetic resin layer 2 and the antifouling layer 3, and the chalk scraper 7 and An embossed pattern provided with the chalk holding portion 8 is formed.

  In the embodiment, in order to obtain a wallpaper suitable for blackboard applications, the surface of the wallpaper WP is provided with a chalk scraping portion 7 having a large number of tip-shaped projections and a portion between the chalk scraping portion 7. A writing surface formed from the formed chalk holding portion 8 is provided.

The maximum height H of the chalk scraping portion 7 of the wallpaper WP shown in FIG. 1 is approximately 160 μm to 200 μm, which will be described in detail later.
(Conventional embossing)
There are many embossed wallpaper itself in the conventional wallpaper, but the purpose was to give unevenness with changes in order to enhance the design of the wallpaper.

  FIG. 8 shows a schematic diagram of a cross section of a textured wallpaper as an example of a conventional embossed pattern. For example, with this grain pattern, the original pattern is created by plastering together with the joints using real sand as material. Here, silicon resin is poured into the mold, and an embossing roller 5 having an original pattern is created based on the mold. By doing in this way, it can be set as the wallpaper which uses real sand, although it is a synthetic resin. Such a wallpaper can reproduce a realistic plastering wall and create an uneven shape with irregular sandy grain shapes. Therefore, it is possible to express the creation created by nature on the wallpaper, so you can create an interesting wallpaper in terms of design. Similarly, silicon is poured into a dirt wall, gravel, or woven fabric to create a pattern by making a mold.

  Alternatively, although not shown in the drawings, there is also an apparatus in which an embossed pattern is engraved on the surface of an embossing roller by a laser beam. With such a processing method, the energy of the laser beam is concentrated at one point for processing, so that the metal in that portion melts to form a concave portion like a small crater. When this is used as an original pattern, the transferred embossed pattern has a large number of sharp protrusions as shown in FIG. In addition, the molten metal has a complicated shape.

Furthermore, when the surface of the embossing roller 5 is processed by etching or the like, it becomes a random shape and a micro-complex shape.
The present inventor first examined the writability and erasability of chalk with such a wallpaper, and found that the writability and erasability also vary. In other words, it turned out that wallpaper cannot be used like a blackboard.

  The reason for this is that the conventional textured wallpaper as shown in FIG. 8 has a rough embossed shape on the surface, a wide variety of shapes with edges, and it is difficult for chalk to adhere to the shape. In particular, it was found that the greater the height difference, the worse the writing property and erasability. Furthermore, with such a grained pattern shape, it becomes difficult to remove the chalk powder once entering the recess.

  Similarly, in laser processing, the fine convex portion can only scratch the chalk with this convex portion, and it is difficult to hold the scraped chalk. Furthermore, in a fine convex part, force concentrates here and durability falls. Another problem is that the roughened surface is transferred by laser processing, which makes it difficult to erase the chalk powder.

Similarly, even with fine irregularities such as etching, there is a problem that it is difficult to erase the chalk in the gap.
In the first place, it is not assumed that the conventional wallpaper having a rough texture is used as a blackboard, but simply a random pattern is given from the aspect of the design.

  The regular blackboard is a highly polished steel plate and coated with a blackboard paint containing high hardness and fine particles, so very fine letters can be written. However, such flatness cannot be originally expected from wallpaper. In the case of wallpaper, since it is a synthetic resin having flexibility, its hardness is low, and there is a limit to scratching chalk from the tip by writing.

Therefore, the present inventor repeated verification in order to create a new wallpaper that can be written well with chalk and can be easily erased.
(Embossing of embodiment)
As shown in FIG. 3, in the embodiment, on the surface of the wallpaper WP, a choke scraping portion 7 having a large number of tip-shaped convex portions, and a recess formed between the choke scraping portion 7. And a writing surface formed from the chalk holding portion 8. In the present application, such a shape is referred to as a “pear texture”.

  In the embossing of the satin pattern according to the present embodiment, the concave shape of the original pattern (maximum depth 160 μm, maximum width 600 μm) formed on the embossing roller 5 is transferred to the surface of the wallpaper WP, so that the substantially spherical tip portion is transferred. A satin pattern having the convex chalk scraping portion 7 provided is formed.

Therefore, it is necessary to mold the embossing roller 5 with a concave portion 5a having a rough convex portion such as the surface of a fruit pear and a substantially spherical bottom portion reversed.
In the embodiment, the expert impacts the surface of the embossing roller 5 with a scissors 9 that is a dedicated tool to form the recess 5a.

  Fig.4 (a) shows the front-end | tip part of the collar 9 which is an example of the tool for processing the embossing roller 5 in order to shape | mold such a satin. The flange 9 has a plate-like shape with a thickness of about 1 mm at the tip and a curved surface with a cylindrical side surface at the end. In addition, as shown in FIG.4 (b), you may use the scissors 9 whose tip is spherical shape. In any case, the shape of the recess formed in the embossing roller 5 can be adjusted by the curvature of the tip.

  As a simple method, the hammer 9 is hit manually against the surface of the embossing roller 5 by a hammer to form a concave portion 5a of a certain depth, and this is repeated many times in random directions by changing the direction. The pear texture is formed by carrying out until the direction of the unevenness disappears and the particle shape and depth become uniform.

  Of course, such processing can also be performed with an NC processing machine or the like. Further, industrially, an original pattern inverted to a thin metal mill roller (not shown) having a diameter of about 20 cm is prepared before forming an embossing roller. The mill roller is pressed against a metallic roller having a diameter of about 120 cm and rotated to transfer the original pattern of the emboss to the entire roller, thereby forming the emboss roller 5. By transferring such a large embossing roller 5 to the wallpaper WP, the surface of the wallpaper WP has a large number of spherical projections, and a recess formed between the chalk scraping portion and the chalk scraping portion. Thus, the embossed pattern formed with the chalk holding portion is efficiently formed.

  As for the original pattern of the satin formed with the ridge 9, all the recessed parts 5a are formed in the shape provided with the substantially spherical mortar-shaped curved surface. The ridgeline between the recess 5a and the recess 5a is a convex portion 5b having a slightly sharp cross section. For this reason, the embossed pattern in which the shape of the original pattern is transferred onto the surface of the wallpaper WP by embossing forms a chalk scraping portion 7 composed of a large number of substantially spherical protrusions, and the chalk scraping portion 7 and the chalk scraping portion. A choke holding portion 8 formed between the take-up portion 7 is formed.

In the present embodiment, an uneven embossed pattern having a random and constant height is formed by such a process.
It is also preferable to use a tool having a spherical tip shown in FIG. 4B instead of the rod 9 having a cylindrical tip shown in FIG.

  In addition, it is not limited to the aspect which forms a recessed part directly in the metal roller like embodiment, You may transfer and cast a pattern from a soft original pattern. In addition, the original pattern can also be formed by shot blasting using spherical particles of cast iron or cast steel without depending on such a tool.

In any case, a recess 5a having a substantially spherical bottom is formed.
(Shape of chalk scraper)
The chalk holding portion formed between the chalk scraping portion 7 and the chalk scraping portion 7 on the surface of the wallpaper WP by the embossing roller 5 as described above. 8 is formed, and the scraper 7 having a maximum height of 100 to 340 μm, preferably 160 to 200 μm is formed. Here, the “spherical shape” means a smooth curved surface having no edge portion, and is not intended to follow a strict spherical surface. The point is that the choke scraping portion 7 is convex toward the tip side and does not concentrate stress excessively.

  In this case, since the width of the choke scraping portion 7 is a random shape, the variation is large, but the maximum width is preferably 1 to 5 times the maximum height. When the width is 1 or less, the deflection of the choke scraper 7 is increased and the writing pressure is also reduced, so that the writing property and the wear resistance are lowered. Moreover, the width | variety of the chalk holding | maintenance part 8 becomes narrow, and the erasability of chalk powder hold | maintained here deteriorates.

  On the other hand, when the maximum width exceeds five times the maximum height, the chalk scraping part 7 becomes difficult to scrape the chalk CH, and the chalk holding part 8 is also opened to hold the scraped chalk powder. It becomes difficult.

  Therefore, in consideration of wear resistance, durability, writing pressure, retention of chalk powder, etc., the width of the chalk scraping portion 7 is twice to 4.2 from the evaluation of Examples 1 to 5 with respect to the height. About double is more preferable.

  As a result of the chalk scraping portion 7 having such a shape, the chalk dust is efficiently scraped off by the chalk scraping portion 7 and scraped into the chalk holding portion 8 having a recess having an appropriate depth. Is retained.

On the other hand, when the written character or picture is wiped off, the recessed portion is not too deep, so the brushed blackboard wipe reaches the bottom, and the chalk powder can be easily wiped off.
In particular, since the bottom surface of the chalk holding portion 8 has a smooth curved surface, the chalk powder is not clogged, and the chalk powder is erased cleanly by the surface of the brushed blackboard wipe.

As a result, unevenness can be provided on the surface to enhance the designability, and wear resistance, writing property and erasability can be improved at the same time.
(Wallpaper manufacturing method)
First, raw materials are kneaded to produce a liquid vinyl chloride resin compound.

Next, about 0.2 to 0.4 mm of a liquid vinyl chloride resin compound is applied to the backing material with a coating machine and gelled by heating to form the synthetic resin layer 2.
Subsequently, the antifouling layer 3 made of an ethylene-vinyl alcohol copolymer resin (EVOH) film provided with the adhesive layer 4 is laminated on the synthetic resin layer 2 through the adhesive layer 4.

A synthetic resin layer 2 made of a vinyl chloride resin compound coated on the surface of the backing layer 1 is heated to 140 ° C to 170 ° C.
The embossed pattern is formed by cooling the synthetic resin layer 2 in a heated and softened state by using the embossing roller 5 and the pressure roller 6 and then cooling the synthetic resin layer 2 with the embossing roller 5 from the antifouling layer 3 side. Of course, it may be formed by a flat embossing machine.

  In the present embodiment, the embossing roller 5 and the pressure roller 6 are used to perform embossing by a thermal lamination method, and at the same time, an ethylene-vinyl alcohol copolymer resin is applied to the synthetic resin layer 2 of vinyl chloride resin. The antifouling layer 3 made of (EVOH) film is simultaneously laminated by the adhesive layer 4 made of a heat-sensitive adhesive.

  However, the antifouling layer 3 and the synthetic resin layer 2 may be prepared in advance by laminating with a thermal lamination method prior to embossing, and then an embossing pattern may be provided by embossing.

Through such a process, the wallpaper WP formed with the embossed pattern is completed.
In the construction as wallpaper WP, an aqueous emulsion adhesive is applied to the backing layer 1 in the same manner as a normal wallpaper, and is adhered to a wall having a smooth surface.

(Chalk)
The chalk CH is premised on the use of chalk made of calcium carbonate, gypsum, and other materials conforming to JIS S 6009. For example, in the embodiment, a product made of calcium carbonate derived from scallop shell of Dustress Chalk (registered trademark) manufactured by Riken Corporation of Japan is used.

(Comparison between Examples 1-5 and Comparative Examples 1-4)
FIG. 5 is a schematic diagram showing a state of writing with the chalk CH in the embodiment. In the present embodiment, the “pear texture” refers to a shape having rough projections such as the surface of a fruit pear. In other words, as shown in FIG. 5, a chalk scraping portion 7 made up of a number of substantially spherical protrusions is formed on the surface of the wallpaper WP, and is formed between the chalk scraping portion and the chalk scraping portion. The one having an embossed surface on which the chalk holding portion 8 is formed. Examples 1 to 5 are common in that such embossing is performed.

FIG. 9 is a table showing the results of testing abrasion resistance, writing property and erasability by comparing Examples 1 to 5 and Comparative Examples 1 to 4 of this embodiment.
The numerical value of “maximum height” is a one-shot 3D shape measuring instrument manufactured by Keyence Corporation, product model number “VR-3200”. The surface shape was determined by measuring at 1 μm, the maximum height Rz of the roughness curve was determined according to JIS B 0601-2013, and the third digit was rounded off to be the “maximum height” of this test.

The ratio of the width to the height of the choke scraper 7 varies approximately from 1 to 5 times.
Examples 1-5 are provided with the backing layer 1 which consists of a sheet | seat made from a pulp paper of thickness 0.2mm.

  Further, a synthetic resin layer 2 having a thickness of 0.4 mm made of 100 phr of vinyl chloride resin, 50 phr of plasticizer, 50 phr of calcium carbonate, 15 phr of titanium oxide, 2 phr of stabilizer, and 1 phr of foaming agent is provided.

In addition, each has an antifouling layer 3 made of an ethylene-vinyl alcohol copolymer resin (EVOH) film having a thickness of 12 μm.
Unless otherwise noted, Comparative Examples 1 to 4 also have a common configuration.

Example 1
The example in which the maximum height of the chalk scraping part 7 is 100 μm and the maximum width of the chalk scraping part 7 is about 200 μm is referred to as Example 1.

(Example 2)
Example 2 is one in which the maximum height of the chalk scraping part 7 is 160 μm and the maximum width of the chalk scraping part 7 is about 600 μm.

(Example 3)
Example 2 is one in which the maximum height of the choke scraper 7 is 180 μm and the maximum width of the choke scraper 7 is about 700 μm.

Example 4
The example in which the maximum height of the chalk scraping part 7 is 200 μm and the maximum width of the chalk scraping part 7 is about 800 μm is referred to as Example 3.

(Example 5)
The example in which the maximum height of the chalk scraping part 7 is 340 μm and the maximum width of the chalk scraping part 7 is about 1400 μm is referred to as Example 4.

(Comparative Example 1)
FIG. 7 is a schematic diagram showing a state of writing with chalk in a comparative example. FIG. 7 shows that a chalk scraping portion 7 made up of a number of substantially spherical protrusions is formed on the surface of the wallpaper, and the chalk holding formed between the chalk scraping portion and the chalk scraping portion. The embossed surface on which the portion 8 is formed is Comparative Example 1 having a maximum height of about 580 μm and a maximum width of about 1600 μm.

  In this case, when writing with chalk, the chalk CH is scraped off by the chalk scraper 7, but since the chalk holder 8 is relatively large, the number of parts to scrape the chalk is reduced, and the chalk scraper is removed. The amount of chalk powder scraped off by the portion 7 cannot fill the chalk holding portion 8 with chalk powder. That is, even after writing with chalk, the chalk holding portion 8 is exposed. That is, the writing ability is deteriorated because the characters cannot be written sufficiently.

In addition, since the absolute depth of the chalk holding portion 8 is increased, even if the brush is wiped with a brushed blackboard wipe, the brushed fibers do not reach the back and the erasability is deteriorated.
(Comparative Example 2)
Although illustration is omitted, Comparative Example 2 is a case where the maximum height of the choke scraper 7 is 0 μm and the average width of the choke scraper 7 is 0 μm. That is, it is a flat shape without embossing. As a result, the chalk scraping portion 7 does not exist, and there is no portion that becomes a projection for scraping the chalk, so that the writing property is remarkably inferior.

(Comparative Example 3)
In Comparative Example 3, the antifouling layer 3 is omitted from Example 2. Therefore, the synthetic resin layer 2 of the vinyl chloride resin is exposed, and the writing is directly written with chalk here.

  The sheet of the vinyl chloride resin of Comparative Example 3 has a low surface smoothness, is easily attached with chalk powder, and has high writing properties. However, since it is difficult to completely remove the chalk powder once adhered, the erasability is remarkably inferior.

(Comparative Example 4)
Here, FIG. 6 is a schematic diagram showing a state of writing with chalk in a comparative example. The embossed pattern shown in FIG. 6 is generally a shape in which the unevenness of the embossed pattern in FIG. 5 is inverted, and is the same shape as the original pattern formed on the embossed roller 5 in Examples 1-5. In the case of a shape in which a large number of spherical mortar-shaped concave portions are gathered as shown in FIG. 6, a shape like a protrusion or a ridge line in which the boundary between the concave portion and the concave portion protrudes. In such a shape, when writing with chalk, the protruding boundary portion becomes the chalk scraping portion 7 and scrapes the chalk.

  However, when such a choke scraping portion 7 has a sharp protruding shape, a large force is concentrated on the protruding portion, and with a flexible vinyl chloride resin, the protruding portion is easily bent and buckled. The pressure cannot be secured and the chalk cannot be scraped off sufficiently. In addition, when a force is repeatedly applied to such a protrusion, the wear is severe and may cause damage or wear.

  On the other hand, in the case of a shape in which a large number of mortar-shaped concave portions are gathered, the concave portions serving as the chalk holding portion 8 are open, and the chalk powder scraped off by the chalk scraping portion 7 is difficult to hold. Furthermore, the area of the chalk holding part 8 is large, and it is difficult to fill it with the chalk powder scraped off by the chalk scraping part 7, so that the writing property is lowered as compared with the satin pattern.

Therefore, even when having the same maximum height H, a problem arises in writing property and durability as compared with the satin pattern of the present embodiment.
(Comparison of Example and Comparative Example)
As a result of the comparison test under the above conditions, the results shown in FIG. 9 were obtained.

(Abrasion resistance)
First, when comparing the wear resistance, Comparative Example 3 in which the antifouling layer 3 is omitted has remarkably low wear resistance and is not practical. Further, in Comparative Example 4 in which the concavo-convex shape is reversed from that of the embodiment, since the width is narrow with respect to the maximum height of the convex portion, stress concentrates on the choke scraping portion 7 and the choke scraping portion 7 is deformed. Since it is easy, the wear resistance is low. On the other hand, Examples 1 to 5 and Comparative Examples 1 and 2 showed high wear resistance because such problems did not occur.

(Writing)
Next, with respect to the writing property, the flat comparative example 2 without embossing does not have the chalk scraping portion 7, so the chalk is not scraped off and the writing property is extremely low. Further, in Comparative Example 1 in which the maximum height of the choke scraping portion 7 is 580 μm, the radius of the spherical surface of the choke scraping portion 7 is large and the chalk is difficult to scrape, so that the writing property is low. Moreover, although the volume of the chalk holding part 8 is large, since the chalk powder sufficient to fill this part cannot be scraped off, the writing property is low in that the chalk holding part 8 cannot be covered. In the comparative example 4 with the inverted shape, the area of the choke holding portion 8 is larger than the choke scraping portion 7, and the choke scraping portion 7 cannot scrape off the chalk that fills this portion.

In Example 1 in which the maximum height of the choke scraping portion 7 is 100 μm, the absolute amount of scraping the choke is lowered, so that the writing property is slightly lowered, but it is within the practical range.
On the other hand, in Examples 2 to 5, the scrape amount of the chalk scraping part 7 and the volume balance with the chalk holding part 8 are good, and the antifouling layer 3 is completely covered, so that the writing property is good. It has become.

In addition, if it says only about writability, the comparative example 3 which does not have the antifouling layer 3 has remarkably high writability.
(Erasability)
Regarding the erasability, in Comparative Example 3 which does not have the antifouling layer 3, since chalk adheres to the synthetic resin layer 2 made of vinyl chloride resin, the chalk cannot be erased even with wet cloth as well as with blackboard wipes. Erasability is inferior. Further, in Comparative Example 1 having a maximum height of 580 μm, the chalk holding portion 8 is large and deep, so that the fibers of the brushed blackboard wipe do not reach, and the chalk powder remains in the chalk holding portion 8. It drops significantly. For the same reason, even in Example 5 having a height of 340 μm, the erasability is slightly inferior.

  In Examples 1 to 4, when erased with a blackboard wipe, the brushed blackboard wipe fibers reach the inside of the chalk holding unit 8 and cleanly remove the chalk powder, thus exhibiting high erasability. In addition, the flat comparative example 2 and the comparative example 4 in which the choke holding portion 8 is opened show high erasability in terms of erasability.

(Conclusion)
If the evaluation 5 is within the practical range, those satisfying both wear resistance, writing property and erasability correspond to Examples 1 to 340 μm where the maximum height of the choke scraper 7 is 100 μm. To do. Furthermore, 8 which is a desirable evaluation corresponds to Example 4 in which the maximum height of the choke scraper 7 from Example 1 is 200 μm. Furthermore, Examples 2 to 4 in which the maximum height of the chalk scraping part 7 having a writing property of 9 or more corresponds to 180 μm. The most desirable example 2 is that the maximum height of the choke scraper 7 is 160 μm.

(Another example)
In addition, although a satin pattern is mentioned in the embodiment, the present invention is a wallpaper functioning as a blackboard, but design is also an important element as wallpaper. As an embossed plate, from the viewpoint of interior decoration, even if the writing property and erasability are somewhat inferior, depending on the purpose, priority is given to designability, and instead of a satin pattern, for example, wood grain plate conduit groove, stone plate surface unevenness It is also possible to adopt a cloth surface texture, a line-like groove, or the like.

  For this purpose, the choke scraping portion 7 is closely formed on the convex portion of the embossed pattern, and the choke holding portion is provided with a concave portion that is open so that the erasability does not deteriorate when the choke scraping portion 7 has an angular shape. 8 and the height difference is preferably in the range of 100 to 340 μm.

(Operation and effect of the embodiment)
According to the wallpaper of the said embodiment, the following effects can be acquired.
(1) Writability The wallpaper WP of the present embodiment shows high writing performance at the same level as blackboard and blackboard paint, and can easily draw characters and pictures with chalk CH as a substitute for blackboard. Compared to the maximum height of the choke scraper 7, the maximum width is 1 to 5 times, and the shape of the choke scraper 7 is difficult to bend and buckle. Improves writing ability. Furthermore, the synthetic resin layer 2 adjusts the foaming agent to lower the expansion ratio, and similarly adjusts the plasticizer to increase the hardness of the synthetic resin layer 2 and increase the writing pressure of the chalk.

(2) Visibility In addition, if the wallpaper WP of this embodiment has the same color as the blackboard, it shows the same level of visibility as the blackboard and blackboard paint, and even the chalk clearly shows characters and pictures on the wall. Can be drawn.

(3) Erasability On the other hand, characters and pictures once drawn with chalk can be easily and neatly erased even with a normal blackboard wipe. Further, since it has the antifouling layer 3, it can be completely erased with a dry or wet cloth.

(4) Abrasion resistance Since the antifouling layer 3 has high strength, it exhibits high abrasion resistance. Furthermore, since the chalk scraping portion 7 has a substantially spherical shape, stress is less likely to concentrate when writing with chalk or erasing. Moreover, since the width | variety is 1-5 times compared with the maximum height of the chalk scraping part 7, and it is hard to bend and buckle, it has improved abrasion resistance further. Furthermore, the synthetic resin layer 2 has high wear resistance because the foaming ratio is lowered by adjusting the foaming agent. Similarly, the plasticizer is adjusted to improve durability.

(5) Designability In the embodiment, the antifouling layer 3 employs a transparent layer, and the synthetic resin layer 2 can be freely colored with a colorant or printed on the surface to form a conventional blackboard. No, you can produce a free color. Since the ink printed on the surface of the synthetic resin layer 2 is protected by the transparent antifouling layer 3 having a high strength, it does not peel off or be worn away.

For example, it is possible to print wood grain on the synthetic resin layer, and while it is a design tailored to the interior, it seems that characters and pictures can be freely written and erased on a wooden board.
Moreover, it is easy to give the wallpaper WP itself decorativeness, and it is also easy to draw a frame like a blackboard on the wallpaper itself.

Further, the embossed pattern can give a three-dimensional change to the surface, and the design effect of changing the texture is also high.
(6) Flexibility and workability Unlike conventional blackboard wallpaper, it is flexible and can be used as a blackboard along a curved wall. it can.

It can also be cut and pasted on furniture, etc. according to the size.
If you have a board, you can easily make a blackboard.
(7) Easy construction Compared to a conventional blackboard, it is extremely light and does not require preparations to support a heavy blackboard. Moreover, since it only sticks to a wall surface with an adhesive agent, it can install very easily. Removal and reattachment are extremely easy.

  In addition, the synthetic resin layer 2 of the wallpaper WP of the present embodiment is thick and has some elasticity and elasticity, so that a high degree of flatness of the background is not required unlike a blackboard sheet. The unevenness is acceptable.

(8) Fire resistance / flame retardant / heat resistance Since the fire retardant performance of the wallpaper WP of the embodiment can satisfy the standard of non-flammability, it can be used as an interior material without any restrictions on the place of use.

(9) Antifouling property The antifouling layer 3 has basic antifouling performance from its material, and can be easily removed even if it is contaminated with water-based / oil-based markers, crayons, coffee or tea. Therefore, it can be suitably used as a blackboard for a kitchen, a child's room, etc. instead of a blackboard that is easily soiled.

(10) Impact resistance In the wallpaper of the present embodiment, the antifouling layer 3 on the surface has high impact resistance and is less likely to be damaged, and can be used safely as a blackboard in a kitchen or a child's room.

(11) Economical The cost and cost of ordinary wallpaper are not much different, and it is extremely economical compared to expensive blackboards. It can be used at low cost as a temporary blackboard for a short period.

(12) Manufacturability Since a certain shape is formed by embossing as in the case of ordinary wallpaper production, the production is easy and the production cost is low.

DESCRIPTION OF SYMBOLS 1 ... Backing layer, 2 ... Synthetic resin layer, 3 ... Antifouling layer, 4 ... Adhesive layer, 5 ... Embossing roller, 5a ... Concave part, 5b ... Convex part, 6 ... Pressure roller, 7 ... Chalk scraping part, 8 ... Choke holder, 9 ... 鏨 (tool), CH ... Choke, WP ... Wallpaper

Claims (8)

A backing layer for adhering to the wall;
A synthetic resin layer made of a thermoplastic resin laminated on the backing layer;
A wallpaper comprising an antifouling layer laminated on the surface of the synthetic resin layer,
On the surface of the wallpaper, a chalk scraping part which is a large number of spherical convex parts,
Writing with a chalk, characterized in that it has a concavo-convex surface formed from a chalk holding portion which is a recess formed between the chalk scraping portions, and the maximum height of the chalk scraping portion is 100 to 340 μm Wallpaper.   The wallpaper according to claim 1, wherein a maximum height of the chalk scraping portion is 160 to 200 μm.   The wallpaper according to claim 1 or 2, wherein the antifouling layer is in a state in which an ethylene-vinyl alcohol copolymer resin film having a thickness of 10 to 20 µm is laminated.   The wallpaper according to any one of claims 1 to 3, wherein a maximum width of the chalk scraping portion is 1 to 5 times a maximum height. A method of manufacturing wallpaper for writing with chalk,
Laminating a synthetic resin layer made of a thermoplastic resin on a backing layer for adhering to a wall surface;
Laminating an antifouling layer on the surface of the synthetic resin layer;
The laminated synthetic resin layer and the antifouling layer were formed between the chalk scraping portions and the chalk scraping portions, which are a large number of spherical convex portions, so that the maximum height is 100 to 340 μm. And a step of forming an uneven surface comprising a chalk holding portion which is a recess.   The method for producing a wallpaper for writing with chalk according to claim 5, wherein the step of forming the uneven surface is performed by embossing. The embossing creates a base pattern by forming a large number of mortar-shaped concave surfaces by impacting the surface of a metal embossing roller in a non-directional direction with a cylindrical side or spherical metal tool. By transferring to the surface of the wallpaper, the surface of the wallpaper is formed with a large number of spherical convex portions, a chalk scraping portion, and a choke holding portion, which is a concave portion formed between the chalk scraping portions. A method for producing wallpaper for writing with chalk according to claim 6. The embossing creates a shape by reversing the original pattern on which a mortar-shaped concave surface is formed by irradiating the surface of a metal mill roller with a cylindrical side or spherical metal tool in a non-directional direction. Is pressed against a metal roller to create an embossing roller by transferring the embossed pattern, and the embossing roller is transferred to the wallpaper. And a chalk holding portion that is a recess formed between the chalk scraping portion and the chalk scraping portion.

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