JPH11158442A - Pressure-sensitive adhesive paper sheet and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive paper sheet in which the strength resulting from the expansion or contraction of the face paper upon moisture absorption or release and acting to peel the pressure-sensitive adhesive layer out of the paper is perfectly absorbed, and therefore the finish at the time of sticking can be maintained and to provide a process for producing the same. SOLUTION: There is provided a pressure-sensitive adhesive paper adhesive sheet having a facial paper 1 and a pressure-sensitive adhesive layer 3 and having a release sheet 4 on either surface of the layer 3, wherein such deep or high irregularities as to absorb the expansion or contraction of the paper 1 resulting from a moisture change are formed on the paper 1, and a fixing layer 2 to fix the surface paper 1 is disposed between the surface paper 1 and the other surface of the layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive paper sheet used as a backing paper for fusuma paper, wallpaper, booth paper and calligraphy for interior decoration, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, it has been technically difficult to paste fusuma paper, calligraphy backing paper, wallpaper, and the like. For the purpose of facilitating the sticking operation, a re-wetting method in which a water-soluble adhesive is applied to the back side of the paper and dried, or a thermal bonding type sliding paper or wallpaper provided with a hot-melt adhesive resin has been proposed. I have.

[0003] The sliding paper or wallpaper of the re-wet system is used to apply adhesiveness by supplying moisture to the sliding paper or wallpaper and affix it to a predetermined portion of the adherend. Although gluing work can be omitted in this method, it is difficult to set the amount of water to the paper because paper has the property of absorbing or releasing moisture and expanding and contracting. Technology is required.

On the other hand, examples of the thermal bonding type sliding paper or wallpaper include a thermal bonding paper sheet as described in Japanese Patent Publication No. 5-77800. This type of fusuma paper or wallpaper can be stuck beautifully, but has the trouble of using a heat source such as an iron.

[0005] Therefore, an adhesive type sliding paper or wallpaper has been proposed for these rewetting or thermal bonding sliding paper or wallpaper. These are those in which an adhesive is applied to the back surface of the surface paper to form an adhesive layer, and a release sheet is provided on the surface of the adhesive layer to protect the adhesive surface. The sticking operation is performed while peeling off the sheet. The adhesive method is advantageous in that the sticking operation can be performed at room temperature without using water or a heat source.

However, in the above-mentioned adhesive type sliding paper or wallpaper, only an adhesive or a pressure-sensitive adhesive is provided on the back side of the surface paper, and the application step of the pressure-sensitive adhesive or the like in the sticking operation is merely omitted.

In addition, as long as the surface paper is made of paper, the surface paper repeatedly expands and contracts due to changes in indoor humidity, causing floating, wrinkles,
It causes slack, peeling and the like.

As a method for solving this problem, Japanese Patent Application Laid-Open
JP-A-34400 discloses that a non-hygroscopic member made of a synthetic resin layer having a thickness of 15 to 130 μm is provided on a surface paper, and an adhesive is applied to the non-hygroscopic member.

In Japanese Patent Application Laid-Open No. 9-111700, pulp, polyester, modified polyester, and vinylon are used as the raw material of the surface paper, and the mixing ratio of each is set to 78: 10: 9: 3, whereby the underwater is obtained. It is disclosed that the elongation is suppressed to 0.1% to prevent expansion and contraction of the base paper due to moisture absorption.

However, as long as the moisture absorbing and swelling pulp is blended in the surface paper, the surface area of the surface paper increases when the pulp absorbs and swells to increase the volume to a greater or lesser degree. When the pulp releases moisture to reduce the volume, it is inevitable that the area of the surface paper decreases and the surface paper expands and contracts as a whole. In both cases, since the pressure-sensitive adhesive is applied to the entire surface of the surface paper, the stretching force of the surface paper acts directly on the pressure-sensitive adhesive. , Wrinkles, slack, and peeling may occur.

The same applies to an adhesive wall covering composed of a hydrophilic substrate layer, an adhesive layer, and a decorative layer such as PVC, as disclosed in JP-A-6-502895. . That is, since the adhesive wall covering material is set to have a relatively high water content, it shrinks during drying after the application, and particularly when the surface of the adherend is rough, the initial adhesive force is also reduced, and the peeling of the adhesive wall covering material is caused. Cause.

In the case of a roll-shaped continuous web comprising a pressure-sensitive adhesive layer, a substrate layer, a decorative surface layer and a release surface as disclosed in JP-A-9-506923, the substrate layer Since the ratio of the hydrophilic material (cellulose) contained in the base material is 10 to 95% by weight of the base material, the base material layer swells when absorbing water, and tends to increase the area as the volume increases. And since the pressure-sensitive adhesive layer is of a re-peelable type,
In particular, if the surface to be bonded is rough, it may cause peeling.

[0013]

As described above, as long as a cellulosic material such as pulp having hygroscopic swelling is blended in the surface paper, the surface paper is caused to absorb and release moisture due to a change in humidity in the indoor environment. Expansion and contraction of the surface paper is inevitable. And
The expansion and contraction of the area of the surface paper due to the expansion and contraction is a decisive blow in the case of a paper sheet such as an adhesive wallpaper or a sliding paper using an adhesive as a bonding means. In particular, when the surface of the adherend is rough like a plywood and has a small contact area with the paper sheet, it takes a long time for the adhesive of the paper sheet to diffuse and permeate into the adherend. It takes a considerable amount of time to obtain the adhesive force, but if the area of the surface paper of the paper sheet changes during this time, a peeling force acts on the adhesive surface between the adherend and the adhesive layer of the paper sheet from the surface paper side. As a result, the paper sheet easily peels off from the adherend.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, and on the premise that the surface paper absorbs and desorbs moisture due to a change in indoor environmental humidity. The purpose of the present invention is to provide a pressure-sensitive adhesive paper sheet which can completely eliminate the effect of the peeling force on the pressure-sensitive adhesive layer caused by the expansion and contraction of the surface paper and maintain the finish at the time of sticking, and a method for producing the same. is there.

[0015]

According to the present invention, there is provided an adhesive paper sheet having a surface paper and an adhesive layer, and a release sheet provided on one surface of the adhesive layer.
A film-like fixing layer for fixing the surface paper between the surface paper and the other surface of the pressure-sensitive adhesive layer, while forming irregularities to the extent that the expansion and contraction of the surface paper itself due to a change in humidity is absorbed. Was arranged. The unevenness of the surface paper can be formed by embossing or creping.

Here, the release sheet may be provided with irregularities, or the entire surface or a part of the surface of the pressure-sensitive adhesive layer may be provided with irregularities.

When the pressure-sensitive adhesive emulsion containing a dispersion medium is used as the pressure-sensitive adhesive layer of the pressure-sensitive adhesive paper sheet of the present invention, the whole is hermetically sealed.

If necessary, a function as a release sheet may be added to the surface of the top paper, and an extremely thin layer of a release agent may be formed on the surface of the pressure-sensitive adhesive layer.

In addition, recycled pulp or hydrophobic fiber may be blended in an amount of 5 to 100% by weight as a material constituting the surface paper.

On the other hand, in the present invention, as a method for producing the pressure-sensitive adhesive sheet, a step of forming irregularities on the surface paper, a step of bonding the surface paper to one surface of the film-like fixing layer, A step of forming a pressure-sensitive adhesive layer by applying and drying a pressure-sensitive adhesive, and a step of bonding the pressure-sensitive adhesive layer to the other surface of the fixing layer. In the step of forming irregularities on the surface paper, embossing or creping can be performed. In addition to the above steps, the method for producing a pressure-sensitive adhesive sheet of the present invention may further include a step of providing irregularities on the release sheet, or a step of forming irregularities on the entire surface or a part of the surface of the pressure-sensitive adhesive layer.

Then, if necessary, in addition to the above steps,
A step of hermetically packaging the entire adhesive paper sheet, a step of adding a function as a release sheet on the surface of the top paper, or
A step of forming an extremely thin layer of the release agent on the surface of the pressure-sensitive adhesive layer may be further provided.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION In the pressure-sensitive adhesive paper sheet of the present invention, as the material for the surface paper, paper-made or moisture-swellable natural cortex fibers, wood pulp, non-wood pulp and cellulose fibers are used. As long as these materials are used, the face paper tends to expand by absorbing moisture when the room is in a high humidity. Conversely, when the room is dried, the surface paper shrinks to release moisture and reduces its volume. And, as described above, this change in volume induces a change in the area of the surface paper and acts as a peeling force to the adhesive surface, causing blistering and peeling. In particular, in the case of adhesion to a sliding door or a wall by the adhesive method, it takes time until the adhesive has been transferred to the adherend and a predetermined adhesive force is obtained.

Accordingly, the present invention provides a surface paper having irregularities by embossing or creping to convert a change in the area of the surface paper caused by a change in humidity in an indoor environment into a change in the height of the irregularities. Thus, the apparent area of the surface paper with respect to the pressure-sensitive adhesive layer is kept constant so that no peeling force acts on the pressure-sensitive adhesive surface from the pressure-sensitive adhesive layer. In order to suppress expansion and contraction of the surface paper as much as possible, it is preferable to mix 5 to 100% by weight of recycled pulp or hydrophobic fiber as the material of the surface paper.

In practice, not all of the stretching force of the surface paper can be absorbed by the change in the height of the irregularities, and a very small stretching force component may work toward the pressure-sensitive adhesive layer. According to the invention, the surface paper is fixed with a film-shaped fixing layer, specifically, at the tip of the convex portion, so that the negligible stretching force component is completely absorbed, thereby affecting the pressure-sensitive adhesive layer. And none.

Further, the present invention provides a pressure-sensitive adhesive emulsion containing a dispersion medium as a component of the pressure-sensitive adhesive layer, or providing an unevenness on the entire surface or a part of the pressure-sensitive adhesive layer surface. By forming an extremely thin layer of release agent,
The initial adhesive strength of the pressure-sensitive adhesive layer is apparently weakened to facilitate the re-sticking operation.

In the present invention, the surface of the surface paper is treated with a substance such as silicone or fluororesin to provide a peeling function in addition to a stain preventing function, thereby making it unnecessary to use a peeling sheet. It is.

Here, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of an adhesive paper sheet according to the present invention. Reference numeral 1 denotes a surface paper, and as shown in the drawing, irregularities are formed over the entire area. 2 is a film-like fixed layer, 3 is an adhesive layer, and 4 is a release sheet.

As shown in FIG. 1, the tip of the convex portion on the back surface of the surface paper 1 is firmly adhered to the film-like fixing layer 2, while the other non-adhered portions of the surface paper 1 are film-like fixing layers. 2, the structure extends vertically and can expand and contract vertically.

Therefore, even if the surface paper 1 expands and contracts by absorbing or releasing moisture due to a change in the humidity of the surrounding environment, the expansion and contraction of the surface paper 1 is absorbed as a change in the height of the irregularities.

The conditions for setting the shape and size of the irregularities formed on the surface paper 1 depend on the physical properties of the surface paper 1 and the film-like fixed layer 2 itself, such as the elasticity, strength, and thickness. That is, the shape and size of the irregularities are obtained by converting a change in the volume or area of the surface paper 1 due to moisture absorption and moisture release into a change in the height of the irregularities, and the appearance of the surface paper 1 with respect to the film-shaped fixing layer 2. Should be set in a range that does not cause a change in area.

As the means for forming the irregularities, known processing means such as embossing and creping can be used. When forming irregularities on the surface paper by embossing, in order to keep the height of the irregularities within the above range, the depth of the embossing plate or the roll plate is set to a range of 1/2 to 10 times the thickness of the surface paper. It is preferable that

When the irregularities are formed by creping, a dry creping method or a wet creping method can be used, but the creping rate is 5 to 100.
%, More preferably 5 to 50%. When the crepe ratio is less than 5%, uniform creping cannot be performed by the dry method, and in the wet method, the paper shrinks during drying and the crepe disappears. On the other hand, when the crepe ratio is more than 100%, the appearance deteriorates. Here, the crepe rate is defined as a reference value L of the surface paper after the length of the front paper after creping is defined as a reference value L, and an increase in the length when the front paper is extended is defined as ΔL. Percentage of increase ΔL with respect to ΔL / L × 100
(%) Or percentage ΔL / L × 100 (%) where the length of the surface paper before creping is defined as the reference value L and the decrease in length after creping is defined as ΔL. When irregularities are formed on the surface paper 1 by creping, the tips of the projections of the surface paper 1 have a projection shape as shown in FIG. 2. Appearance is different.

As a material for the surface paper 1, so-called paper can be used. Specific examples include natural carcass fibers such as mulberry, three-pronged or cancer skin, non-wood fibers such as hemp, straw, bagasse and kenaf, and hydrophilic fibers such as wood pulp or rayon. These various fibers may be used alone or may be mixed and used as composite paper. In addition, the surface paper 1 can be made not only in one layer but also in a multi-layer paper. In this case, the kind or the mixing ratio of the material constituting the layers may be changed for each layer.

Further, in order to improve the dimensional stability against indoor environmental humidity conditions, it is preferable that inorganic fibers, hydrophobic synthetic fibers or recycled pulp of the above-mentioned plant fibers is blended with the above-mentioned raw material in an amount of 5 to 100% by weight. Examples of the inorganic fibers include glass fiber, micro glass, rock wool, mineral wool, alumina fiber, alumina silica fiber, mullite fiber, borate fiber, quartz fiber, silicate glass fiber,
Fused silica fiber, potassium titanate fiber, zirconia fiber, calcium sulfate fiber, phosphate fiber,
Porous silicate fibers, carbon fibers, activated carbon fibers, and the like are included. Examples of the hydrophobic synthetic fibers include fibers using polyethylene, polypropylene, polyester, acrylic, vinyl acetate, vinylon, nylon, polyvinyl chloride, polyvinylidene chloride, polyurethane, benzoate, and derivatives thereof.

Recycled pulp has undergone one to several cycles of drying and rewetting compared to virgin pulp, so that the fiber loses its flexibility, is hard to bend and is hard, and has a keratinized fiber. Due to the progress, the swellability is reduced upon rewetting. In other words, recycled pulp has a smaller water absorption rate and a smaller swelling amount, that is, a smaller change in volume expansion than virgin pulp. Therefore, the use of recycled pulp for the face paper 1 is extremely effective for the dimensional stability of the face paper 1. Work on.

These fibers may be used alone,
Further, it may be used together with various binder fibers.
The mixing ratio of the inorganic fiber, the hydrophobic synthetic fiber, or the recycled pulp is not particularly limited. However, the larger the mixing ratio, the smaller the volume fluctuation width of the surface paper 1. The thickness and width can be reduced, and the material and thickness of the film-shaped fixed layer 2 can be selected in a wider range.

In addition to the above, various fillers and organic binders may be added to the surface paper 1 as required. Examples of the filler include silicate such as pyroxene, kaolin, sericite, talc, and zeolite, calcium carbonate, titanium dioxide, aluminum hydroxide, alumina, and magnesia. Examples of the organic binder include water-soluble urea resins, melamine resins, cationized starch, CMC, epoxy resins, polyimine resins, water-soluble acrylic resins, paper strength enhancers such as methylcellulose, ethylcellulose, and hydroxyethylcellulose, and maleic acid. Various sizing agents such as a hydrophilic sizing agent, a rosin-based sizing agent, a polymer resin emulsion, and a rubber latex can be used.

The surface of the surface paper 1 may be coated with vinyl chloride, printed, or affixed with a different material such as a fabric directly to decorate a decorative design or the like. In this case, the above-mentioned application or the like may be performed after forming the unevenness on the surface paper, or the unevenness may be formed after performing the above-described application or bonding on the surface paper. When the different material has appropriate unevenness, the unevenness may be provided by bonding paper along the different material.

Further, the surface paper decorated as described above may be further subjected to processing required for wallpaper, fusuma paper, etc., such as stain prevention, flame retardant processing, non-combustible processing, and foam embossing.

The film-like fixing layer 2 fixes the apparent area of the surface paper 1 by fixing the convex portion on the back surface of the surface paper 1 provided with the unevenness. Has a function of completely absorbing the slightest stretching force of the surface paper 1 that could not be absorbed. Therefore,
As the film-shaped fixing layer 2, a hydrophobic film having elasticity enough to be wound into a roll and having good dimensional stability against changes in the temperature and humidity of the living environment is suitable. Further, the film-shaped fixing layer 2 has a function of preventing the adhesive from penetrating from the pressure-sensitive adhesive layer 3 to the surface paper 1, and further has a function of strengthening the adhesion between the surface paper 1 and the pressure-sensitive adhesive layer 3. I have. Specific examples of the material of the film-shaped fixing layer 2 include aluminum foil, polyester-based, polyamide-based, polyacrylonitrile-based, vinylon-based, polyvinyl chloride-based, polyvinylidene chloride-based, polyolefin-based, and polyurethane-based films. Can be used. The thickness of the film-shaped fixing layer 2 needs to be selected so as not to transmit the stretching force due to the moisture absorption and release of the surface paper 1 to the pressure-sensitive adhesive layer 3, and specifically, the thickness of 10 μm to 100 μm is required. The range is appropriate.

The adhesion between the surface paper 1 and the film-like fixing layer 2 is as follows.
Performed by wet or dry laminator. As an adhesive for wet lamination, vinyl acetate emulsion, EVA emulsion, acrylic emulsion and the like can be used.
VA-based or block rubber-based hot melt resin, synthetic rubber latex, polyurethane and the like can be used.

When a polyolefin-based film such as polyethylene or polypropylene is used as the film-shaped fixing layer 2, the polyolefin-based film is extruded in the form of a molten film by extrusion lamination and pressed against the surface paper 1 which has been previously made uneven. Can be pasted. In this case, the surface paper 1 and the film-like fixing layer 2 are bonded to each other with such a pressing force that the convex portions of the top paper 1 are bonded to the film but the concave portions are not bonded. According to the extrusion lamination, it is not necessary to use an adhesive for bonding the top paper 1 to the film-shaped fixing layer 2. As shown in FIG. 1 or FIG. 2, an adhesive layer 3 is adhered to the surface of the film-shaped fixing layer 2 opposite to the surface to which the projection of the top paper 1 is adhered. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 3, either a permanent adhesive or a removable adhesive can be used. That is, those that can be removed, that is, those that have removability at the time of the sticking operation and have permanent tackiness after the completion of the operation.
The thickness of the pressure-sensitive adhesive layer 3 can be appropriately set in the range of 5 μm to 180 μm, but is more preferably in the range of 20 to 60 μm. In addition, when unevenness | corrugation is provided in the adhesive layer 3 as mentioned later, the minimum thickness and the maximum thickness are 5 micrometers-180 micrometers.
It is preferable that it is within the range of μm in terms of appearance.

When a permanent adhesive is used as the pressure-sensitive adhesive layer 3, an ultra-thin layer 3a of a release agent is formed on the surface of the pressure-sensitive adhesive layer 3 as shown in FIG. Alternatively, it is preferable to make the entire surface or a part of the surface of the pressure-sensitive adhesive layer 3 uneven. In this way, when the pressure-sensitive adhesive paper sheet is affixed with light pressure, in the former case, the peelable ultra-thin layer 3a exists on the surface of the pressure-sensitive adhesive layer 3, and in the latter case, the pressure-sensitive adhesive Since the contact area between the layer 3 and the adherend is reduced, it can be easily peeled off and re-attached when re-attaching. Note that the former and latter processes may be performed together.

Here, the release sheet 4 will be described.
Usually, fusuma paper or a release sheet for wallpaper is 30 to 100 g / m2.
A high-quality paper, a film made of a polyolefin resin such as polyethylene is laminated on a release paper such as kraft paper to prevent seepage of the release agent, about 10 to 20 μm,
0.1 to 1 g of silicone release agent with coater head
/ M2, and the release agent is cured by heating, UV or EV treatment. As the release sheet 4 in the present invention, a suitable release sheet for the top paper 1 is selected from the above-mentioned ordinary release sheets.

Now, as shown in FIG. 3, in order to form an extremely thin layer 3a of a release agent on the surface of the pressure-sensitive adhesive layer 3, a release agent 4a such as silicone is excessively provided on the release sheet 4, and specifically, Is applied in a range of about 0.1 to 10 g / m2.

When a permanent adhesive is used as the pressure-sensitive adhesive layer 3, the release agent 4 a is applied to the release sheet 4 in a large amount, so that the release agent 4 a is extremely thin on the surface of the pressure-sensitive adhesive layer 3. By impregnation, it is possible to form on the surface of the pressure-sensitive adhesive layer 3 a releasable ultrathin layer 3a mainly composed of the components of the release agent 4a. Therefore, when the release sheet 4 is peeled off and the pressure-sensitive adhesive layer 3 is lightly pressed and adhered to the adherend, an extremely thin layer mainly composed of a release agent 4a such as silicone present on the surface of the pressure-sensitive adhesive layer 3 The re-peeling property of the layer 3a makes it possible to repeat peeling and bonding two or three times. When the reattachment is completed, the ultrathin layer 3a is broken by strongly pressing the pressure-sensitive adhesive layer 3 from above the surface paper 1, and the permanent pressure-sensitive adhesive 3 exhibits its original adhesiveness and is firmly covered. Adhere to the adhesive.

On the other hand, as a method for providing the entire surface or a part of the adhesive layer 3 with irregularities, the adhesive is previously applied to the entire surface of the release sheet 4 by a roll coater and then partially coated by a gravure roll method, or The adhesive is applied to the release sheet 4 in the reverse order, and then the release sheet 4 and the film-like fixing layer 2 are turned with the surface on the side of the adhesive layer 3 facing the film-like fixing layer 2.
There is a method of bonding.

Also, a method is provided in which the release sheet 4 is previously provided with irregularities by embossing or another method, and an adhesive is applied on the release sheet 4 having the irregularities by a roll coater or the like and then dried and then bonded to the film-shaped fixing layer 2. May be adopted. The adhesive paper sheet manufactured in this manner has a cross-sectional structure as shown in FIG. In addition, Japanese Patent Application Laid-Open No. 8-1422
No. 47 describes that, in an adhesive sheet having a three-layer structure including a surface sheet layer, an adhesive layer, and a release layer, three layers are laminated and embossed at once to provide a convex portion in the adhesive layer. However, such a method of embossing at once with a plurality of layers stacked is not preferable. Because, in reality, the pressure for embossing during embossing is 1 linear pressure.
This is because a high pressure of 00 to 250 kg / cm applies embossing force not only to the release sheet but also to the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive may flow out of the pressure-sensitive adhesive layer. In that case,
The uneven portion formed on the pressure-sensitive adhesive layer must be extremely thin, and the thickness of the pressure-sensitive adhesive layer itself is considerably thin, so that the adhesive strength may be insufficient.

Other methods for providing the pressure-sensitive adhesive layer 3 with irregularities include the following methods.

A silicone-based release agent in an amount of 0.5 to 2 g / m 2 is applied to a release sheet 4 on which a polyolefin or polyester-based film having a thickness of 10 to 20 μm is laminated, and an adhesive is applied thereon. The pressure-sensitive adhesive layer 3 is formed by uniformly applying with a roll coater. In order to form an extremely thin layer of a release agent on the surface of the pressure-sensitive adhesive layer 3, it is preferable to apply a large amount of a silicone release agent on release paper.

Next, as shown in FIG.
The adhesive paper sheet in a state in which a release sheet 4 in which an adhesive layer 3 is adhered to the other surface of the film-like fixing layer 2 in which the adhesive sheet 3 is adhered and fixed to one surface, Is wound around a large-diameter winding core 5a of 75 to 150 mm in a roll shape so that
A master winding 6 of 00 mm is produced.

Then, the adhesive paper sheet is unwound from the parent roll 6, and as shown in FIG.
Is wound in the form of a roll around a small diameter core 5b having a diameter of 25 to 50 mm with the inside as a roll, thereby producing a child winding 7 having a diameter of 50 to 100 mm. In this case, the release sheet 4 is wound inward by a length corresponding to the total thickness of the top sheet 1, the pressure-sensitive adhesive layer 3, and the release sheet 4 itself. Therefore, the release sheet 4 is deformed in a wavy shape in order to absorb the length. In this manner, irregularities are automatically formed on the release sheet 4. At this time, since the adhesive layer 3 has fluidity, irregularities also occur on the adhesive layer 3.

The release sheet 4 may have fine irregularities formed in advance. In this case, it is effective to solve the trouble when the adhesive paper sheet is child-wound from the large-diameter roll-shaped parent winding 6 to the child winding 7 with a predetermined size. In other words, when the adhesive paper sheet is turned upside down,
By absorbing the change in the length to some extent on the release sheet 4 side, "lifting (tunneling)" of the release sheet 4 generated at the time of child winding can be eliminated. Further, it is possible to eliminate so-called "floating wrinkles" and "squeezing wrinkles" which are generated in the front surface paper 1 when the child-wound adhesive paper sheet is unwound into a flat surface.

When the pressure-sensitive adhesive layer 3 applied to the release sheet 4 has a relatively high viscosity, the pressure-sensitive adhesive layer 3 may be directly formed with embossing rolls or the like, and then bonded to the fixing layer 2. In this case, when forming irregularities in the pressure-sensitive adhesive layer 3, the release sheet 4 is a stretchable and flexible film in order to effectively transmit the embossing roll or the like pressing force to the release sheet 4 side. Preferably, there is. In this case, the adhesive paper sheet has a cross-sectional structure as shown in FIG.

In the case where the pressure-sensitive adhesive layer 3 is a permanent adhesive and a pressure-sensitive adhesive emulsion composed of a resin component is used, a part of the dispersion medium is left to reduce the initial adhesive force, so that the pressure-sensitive adhesive layer is formed in the same manner as described above. The re-sticking operation can be easily performed. In this case, a pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer 3 uniformly provided on its entire surface is wound up to a predetermined length, and hermetically sealed to prevent evaporation of the dispersion medium.

When the pressure-sensitive adhesive sheet is commercialized in a rolled state, the release sheet 4 can be omitted. Specifically, after performing a predetermined decorating treatment on the surface of the surface paper 1 fixed to the film-shaped fixing layer 2, the surface is protected by covering with an acrylic resin or a polyolefin-based resin, and silicone is coated thereon. 0.5-1 more than usual
After applying 0 g / m2, it is dried to give a peeling function. This is to improve the releasability of the top paper 1 and to form a very thin releasable layer on the surface of the pressure-sensitive adhesive layer applied to the top paper 1 in the next step. Next, the pressure-sensitive adhesive is applied to the surface paper 1 having a peeling function and dried to form a pressure-sensitive adhesive layer 3. In this state, as shown in FIGS. To form a roll 9. At this time, the unevenness of the surface paper is automatically transferred to the adhesive layer 3.

Then, as shown in the enlarged portion of FIG. 7 (b), the pressure-sensitive force F acting from the film-shaped fixing layer 2a outside the pressure-sensitive adhesive layer 3 during winding causes the pressure-sensitive adhesive layer 3 to be in a film-like state. It adheres to the fixing layer 2a. The roll 9 is maintained for a predetermined time until the pressure-sensitive adhesive layer 3 is firmly adhered to the film-shaped fixing layer 2a, and is preferably shipped in this state.

In use, the roll 9 is unwound. Since the surface of the face paper 1 has a peeling function, the pressure-sensitive adhesive layer 3 can be easily peeled from the face paper 1. Then, the pressure-sensitive adhesive layer 3 peeled off from the top paper 1 has irregularities corresponding to the surface shape of the top paper 1.

In this case, since the top sheet 1 has a function as a release sheet, it is not necessary to use a separate release sheet. Further, since the surface of the top paper 1 is coated with the silicone, the surface of the top paper 1 can be prevented from being stained.

Further, since the surface of the pressure-sensitive adhesive layer 3 reflects the unevenness of the surface paper, the unevenness is formed. For this reason, re-peeling becomes possible after temporary bonding, and when performing temporary bonding without wrinkles and positioning, it is possible to increase the contact area with the adherend by performing strong pressing with a brush or the like to perform permanent bonding. It becomes possible.

Since an extremely thin layer having releasability is formed on the surface of the pressure-sensitive adhesive layer 3, when the pressure-sensitive adhesive layer 3 is lightly pressed and adhered to the adherend, the surface of the pressure-sensitive adhesive layer 3 is It is possible to repeat peeling and bonding two or three times by the re-peeling property of the ultra-thin layer mainly composed of silicone existing in the above.

[0062]

EXAMPLE A paper having a thickness of 180 μm (0.18 m) produced at a blending ratio of 90% recycled pulp and 10% virgin pulp
m), the underwater elongation of a 100 g / m 2 surface paper was 0.8%.

Next, the surface paper was embossed to form irregularities. Here, when an adhesive paper sheet is manufactured using the top paper 1, in order to absorb the change in the area of the top paper, an irregularity ratio of 0.8% or more is provided if the paper thickness is ignored. I just need. Then, the paper thickness of the top paper is 180μ.
m, the depth of the embossing plate is set to 90 μm to 1.8 μm.
The roughness was set in the range of mm.

When a 30 μm-thick polypropylene film was attached to the back surface of the surface paper provided with the irregularities by extrusion lamination, the elongation in water was measured.
It was less than 0.1%.

Then, the pressure-sensitive adhesive paper sheet was manufactured by laminating the pressure-sensitive adhesive surface side of the release sheet on which the pressure-sensitive adhesive layer was formed in advance to the surface of the polypropylene film on which the surface paper provided with the irregularities was not bonded. The pressure-sensitive adhesive paper sheet thus obtained did not float, wrinkle, sag, or peel off on the pressure-sensitive adhesive surface with the adherend in a normal use environment.

[0066]

According to the present invention, the pressure-sensitive adhesive is made to have a constant apparent area by converting a change in volume caused by moisture absorption and release of the surface paper into a change in the height of irregularities of the surface paper itself. The effect of the peeling force on the layer can be eliminated. Therefore, lifting, wrinkling, sagging, and peeling can be suppressed, and the finish at the time of pasting can be maintained.

Further, by disposing a film-like fixing layer for fixing the top paper between the top paper and the pressure-sensitive adhesive layer, it is possible to completely absorb the peeling force. .

By providing irregularities on the entire surface or a part of the release sheet or the pressure-sensitive adhesive layer, or by forming an extremely thin layer mainly composed of a release agent on the surface of the pressure-sensitive adhesive layer, The initial bonding force can be reduced, and the re-sticking operation can be easily performed. On the other hand, when an emulsion-based pressure-sensitive adhesive is used as the pressure-sensitive adhesive layer, by maintaining the state in which the dispersion medium is contained, similarly to the above, the initial adhesive force is reduced, and the re-sticking operation can be easily performed. be able to.

Further, by adding a function as a release sheet on the surface of the top paper, a release sheet can be made unnecessary.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an embodiment of an adhesive paper sheet according to the present invention.

FIG. 2 is a schematic cross-sectional view showing an embodiment of the pressure-sensitive adhesive sheet of the present invention in which surface paper is provided with irregularities by creping.

FIG. 3 is a schematic sectional view showing an embodiment of the pressure-sensitive adhesive paper sheet of the present invention in which an extremely thin layer of a release agent is formed on the surface of a pressure-sensitive adhesive layer.

FIG. 4 is a schematic cross-sectional view showing an embodiment of the pressure-sensitive adhesive paper sheet of the present invention when a release sheet provided with unevenness in advance is used.

FIG. 5 is a schematic cross-sectional view showing an example of an embodiment of the method for producing an adhesive paper sheet of the present invention.

FIG. 6 is a schematic cross-sectional view showing an embodiment of the pressure-sensitive adhesive paper sheet of the present invention in a case where irregularities are directly formed on a pressure-sensitive adhesive layer and then bonded to a film-shaped fixing layer.

FIG. 7 is a schematic cross-sectional view showing another example of the embodiment of the method for producing a pressure-sensitive adhesive paper sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front paper 2, 2a Film-shaped fixing layer 3 Adhesive layer 3a Ultra-thin layer 4 Release sheet 4a Release agent 5a Large diameter core 5b Small diameter core 6 Main winding 7 Child winding 8 Core 9 Roll

Claims (16)

[Claims] 1. An adhesive paper sheet comprising a surface paper and an adhesive layer, wherein a release sheet is provided on one surface of the adhesive layer, wherein the surface paper has an expansion and contraction caused by a change in humidity. Adhesive paper characterized by forming irregularities to the extent that it absorbs, and disposing a film-like fixing layer for fixing the top paper between the top paper and the other surface of the adhesive layer. Sheet. 2. The pressure-sensitive adhesive sheet according to claim 1, wherein the unevenness of the top paper is formed by embossing or creping. 3. The pressure-sensitive adhesive paper sheet according to claim 1, wherein the release sheet has irregularities. 4. The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive layer has irregularities on the entire surface or a part of the surface of the pressure-sensitive adhesive layer. 5. The pressure-sensitive adhesive paper sheet according to claim 1, wherein an emulsion of a pressure-sensitive adhesive containing a dispersion medium is used as the pressure-sensitive adhesive layer, and the whole is hermetically sealed. 6. The pressure-sensitive adhesive paper sheet according to claim 1, wherein a function as a release sheet is added to the surface of the top paper. 7. The recycled pulp is 5-1 on the surface paper.
The pressure-sensitive adhesive sheet according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive sheet is contained in an amount of 00% by weight. 8. The pressure-sensitive adhesive paper sheet according to claim 1, wherein the surface paper contains 5 to 100% by weight of hydrophobic fibers. 9. The pressure-sensitive adhesive paper sheet according to claim 1, wherein an extremely thin layer of a release agent is formed on the surface of the pressure-sensitive adhesive layer. 10. A step of forming irregularities on the surface paper, a step of bonding the surface paper to one surface of the film-like fixing layer, and applying and drying an adhesive on the release surface of the release sheet to form an adhesive layer. A method for producing a pressure-sensitive adhesive paper sheet, comprising the steps of: adhering the pressure-sensitive adhesive layer to the other surface of the fixing layer. 11. The method according to claim 10, wherein embossing or creping is performed in the step of forming irregularities on the surface paper. 12. The method for producing a pressure-sensitive adhesive paper sheet according to claim 10, further comprising the step of providing irregularities on said release sheet. 13. The method for producing a pressure-sensitive adhesive paper sheet according to claim 10, further comprising a step of providing irregularities on the entire surface or a part of the surface of the pressure-sensitive adhesive layer. 14. The method for producing an adhesive paper sheet according to claim 10, further comprising a step of hermetically packaging the entire adhesive paper sheet. 15. The method for producing a pressure-sensitive adhesive paper sheet according to claim 10, further comprising a step of adding a function as a release sheet to the surface of the top paper. 16. The method for producing a pressure-sensitive adhesive paper sheet according to claim 10, further comprising a step of forming an extremely thin layer of a release agent on the surface of the pressure-sensitive adhesive layer.