JP3980726B2 - Adhesive paper sheet and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive paper sheet used as interior paper, wallpaper, wallpaper, booth paper, and backing paper for printing, and a method for producing the same.
[0002]
[Prior art]
Previously, it was technically difficult to apply paste paper, paper backing, and wallpaper, etc., and it was performed by technicians who passed the national certification test, such as a front panel and interior construction engineer. For the purpose of achieving this, a re-wetting method in which a water-soluble adhesive is applied and dried on the back side of paper, or a thermal bonding type paper or wallpaper provided with a hot-melt adhesive resin has been proposed.
[0003]
The re-humidified paper or wallpaper is applied to a predetermined portion of the adherend by applying moisture to the paper or wallpaper when it is attached. In this method, the gluing work can be omitted. However, because paper has the property of absorbing or releasing moisture to expand and contract, it is difficult to set the amount of water added to the paper. Technology is required.
[0004]
On the other hand, examples of the heat-bonding paper or wallpaper include a heat-bonding paper sheet as described in Japanese Patent Publication No. 5-77800. Although this type of paper or wallpaper can be affixed beautifully, it is cumbersome to use a heat source such as an iron.
[0005]
Therefore, an adhesive-type paper or wallpaper has been proposed for these rewet or heat-bonded paper or wallpaper. These are adhesive layers that are coated on the back of the front 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 pasting operation is performed while peeling the sheet. The adhesive method is advantageous in that it can be applied at room temperature without using water or a heat source.
[0006]
However, the above-mentioned adhesive-type paper or wallpaper is merely provided with an adhesive or a pressure-sensitive adhesive on the back side of the surface paper, and the application process of the pressure-sensitive adhesive or the like is merely omitted in the pasting operation.
[0007]
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, which may cause floating, wrinkles, sagging, peeling, and the like.
[0008]
As a method for solving this problem, Japanese Patent Laid-Open No. 7-34400 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. Has been.
[0009]
In addition, JP-A-9-111700 uses pulp, polyester, modified polyester, and vinylon as raw materials for surface paper, and sets the blending ratio to 78: 10: 9: 3, thereby increasing the elongation in water. It is disclosed that the expansion and contraction due to moisture absorption of the base paper is suppressed to 0.1%.
[0010]
However, as long as moisture-swellable pulp is blended in the surface paper, the surface paper area increases when the pulp is hygroscopically swollen and the volume is increased, When the volume is reduced by dehumidification, it is inevitable that the surface paper area decreases and the surface paper as a whole expands and contracts. In both cases, since the adhesive is applied to the entire surface of the surface paper, the stretching force of the surface paper acts directly on the adhesive, and when the adhesive strength is weak, it floats after being applied to the adherend. , Wrinkles, sagging and peeling may occur.
[0011]
The same applies to the adhesive wall covering material composed of a hydrophilic base 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 high water content, it shrinks during drying after sticking, especially when the surface of the adherend is rough, combined with a decrease in the initial adhesive strength, it does not peel off. Cause.
[0012]
In addition, in the case of a roll-shaped continuous web composed of a pressure-sensitive adhesive layer, a base material layer, a decorative surface layer, and a release surface as disclosed in JP-A-9-506923, it is included in the base material layer. Since the ratio of the hydrophilic material (cellulosic) is 10 to 95% by weight of the base material, the base material layer swells during water absorption and attempts to increase the area as the volume increases. And since the said pressure sensitive adhesive layer is made into a re-peeling type, when the surface of a to-be-adhered surface is especially rough, it will become a cause of peeling.
[0013]
[Problems to be solved by the invention]
As described above, as long as a cellulose-based material such as moisture-swelling pulp is blended with the surface paper, the expansion and contraction of the surface paper due to moisture absorption and moisture release of the surface paper due to changes in the humidity of the indoor environment is inevitable. . The enlargement and reduction 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-type wallpaper or paper using an adhesive as an adhesive means. In particular, when the surface of the adherend is rough like a veneer plate and the contact area with the paper sheet is small, it takes time to diffuse and penetrate the adhesive of the paper sheet into the adherend. It takes a considerable amount of time to obtain the adhesive force, but if the surface paper area 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. Thus, the paper sheet is easily peeled from the adherend.
[0014]
The present invention aims 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 the indoor environmental humidity, the surface by absorbing or dehumidifying the surface. It is an object of the present invention to provide an adhesive paper sheet that can completely eliminate the action of the peeling force on the adhesive layer caused by the expansion and contraction of the paper, and maintain the finish when affixed, and a method for producing the same.
[0015]
[Means for Solving the Problems]
In the present invention, the pressure-sensitive adhesive paper sheet is provided with a surface paper and a pressure-sensitive adhesive layer, and a release sheet is provided on one surface of the pressure-sensitive adhesive layer. The surface paper absorbs expansion and contraction of the surface paper itself due to a change in humidity. The film-shaped fixing layer for fixing the surface paper is arranged between the surface paper and the other surface of the pressure-sensitive adhesive layer. The unevenness of the surface paper can be formed by embossing or creping.
[0016]
Here, the release sheet may be provided with unevenness, and the entire surface or part of the surface of the pressure-sensitive adhesive layer may be provided with unevenness.
[0017]
And when using the adhesive emulsion containing a dispersion medium as an adhesive layer of the adhesive paper sheet | seat of this invention, we decided to seal-wrap the whole.
[0018]
If necessary, a function as a release sheet is added on the surface of the surface paper, and an ultrathin layer of a release agent is formed on the surface of the pressure-sensitive adhesive layer.
[0019]
In addition, you may mix | blend recycled pulp or hydrophobic fiber 5 to 100weight% as a material which comprises surface paper.
[0020]
On the other hand, in the present invention, as a method for producing the pressure-sensitive adhesive paper 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, and a pressure-sensitive adhesive on the release surface of the release sheet The step of forming a pressure-sensitive adhesive layer by coating and drying and the step of bonding the pressure-sensitive adhesive layer to the other surface of the fixed layer were adopted. In the step of forming irregularities on the surface paper, embossing or creping can be performed.
In the method for producing an adhesive paper sheet of the present invention, in addition to the above steps, a step of providing irregularities on the release sheet, or a step of providing irregularities on the entire surface or part of the surface of the pressure-sensitive adhesive layer may be further included.
[0021]
And if necessary, in addition to the above steps, the step of hermetically packaging the entire pressure-sensitive adhesive paper sheet, the step of adding a function as a release sheet on the surface of the surface paper, or the surface of the pressure-sensitive adhesive layer A step of forming an ultrathin layer may be further provided.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In the pressure-sensitive adhesive paper sheet of the present invention, paper-made or moisture-absorbing swelling natural starch fiber, wood pulp, non-wood pulp, and cellulose fiber are used as the surface paper material. As long as these materials are used, the surface paper swells and absorbs moisture when the room is at high humidity, and tends to expand its volume. On the other hand, when the room is dried, the surface paper is moisture-shrinking and the volume is reduced. As described above, this volume change induces a change in the area of the surface paper and acts as a peeling force on the adhesive surface, causing blistering, peeling, and the like. In particular, in the case of adhesion to a wall or a wall by an adhesive method, it takes time until the adhesive has finished moving to the adherend and obtains a predetermined adhesive force.
[0023]
Therefore, the present invention converts the area change of the surface paper due to the humidity change of the indoor environment by providing unevenness on the surface paper by embossing or creping, etc., to change the height of the unevenness. The apparent area of the surface paper with respect to the pressure-sensitive adhesive layer is made constant so that no peeling force acts on the pressure-sensitive adhesive surface from the pressure-sensitive adhesive layer. In addition, in order to suppress expansion and contraction of the surface paper as much as possible, it is preferable that 5 to 100% by weight of recycled pulp or hydrophobic fiber is blended as the material of the surface paper.
[0024]
In addition, in reality, even if the height of the unevenness can not be absorbed, all of the stretching force of the surface paper cannot be absorbed, and there is a possibility that a very slight stretching force component works toward the adhesive layer. By fixing the surface paper, specifically with the film-like fixing layer at the tip portion of the convex portion, the slight stretch force component is completely absorbed, and there is no influence on the pressure-sensitive adhesive layer. Yes.
[0025]
Further, the present invention provides an unevenness on the entire surface or a part of the surface of the pressure-sensitive adhesive layer, employs a pressure-sensitive adhesive emulsion containing a dispersion medium as a component of the pressure-sensitive adhesive layer, or removes the release agent on the surface of the pressure-sensitive adhesive layer. By forming the ultrathin layer, the initial adhesive force of the pressure-sensitive adhesive layer is apparently weakened, and the re-sticking operation is facilitated.
[0026]
In the present invention, the surface of the surface paper is treated with a substance such as silicone or fluorine resin to provide a peeling function in addition to the function of preventing stains, and a release sheet can be dispensed with.
[0027]
Here, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view for showing an example of an embodiment of an adhesive paper sheet according to the present invention. Reference numeral 1 denotes a surface paper, and unevenness is formed over the entire area as shown in the figure. 2 is a film-like fixing layer, 3 is an adhesive layer, and 4 is a release sheet.
[0028]
As shown in FIG. 1, the tip of the convex portion on the back surface of the front paper 1 is firmly adhered to the film-like fixing layer 2, while the other non-adhesive portions of the front paper 1 are viewed from the film-like fixing layer 2. The structure extends in the vertical direction and can be expanded and contracted in the vertical direction.
[0029]
Therefore, even if the surface paper 1 absorbs or releases moisture due to a change in humidity of the surrounding environment, the expansion and contraction of the surface paper 1 is absorbed as a change in the height of the unevenness.
[0030]
The setting conditions depend on the physical properties such as the stretching force, strength, and thickness of the surface paper 1 and the film-like fixing layer 2 itself, for the shape and size of the unevenness formed on the surface paper 1. That is, the shape and size of the unevenness is obtained by converting the volume or area change of the surface paper 1 due to moisture absorption and moisture release into a change in the height of the unevenness, and the appearance of the surface paper 1 with respect to the film-like fixing layer 2. Should be set in a range that does not cause the change in area.
[0031]
As the unevenness forming means, known processing means such as embossing and creping can be used. When unevenness is formed on the surface paper by embossing, the depth of the embossing plate or roll plate is in the range of 1/2 to 10 times the thickness of the surface paper so that the height of the unevenness is in the above range. It is preferable that
[0032]
Moreover, when forming an unevenness | corrugation by a crepe process, although a dry crepe method or a wet crepe method etc. can be used, it is preferable to make the crepe rate into the range of 5-100%, and also 5-50%. More preferably. When the crepe rate is less than 5%, a uniform crepe cannot be obtained by the dry method, and when the wet method is used, the paper shrinks during drying and the crepe disappears, whereas when the crepe rate is greater than 100%, the appearance deteriorates. Here, the crepe rate is the reference value L of the surface paper when the length of the surface paper after creping is defined as a reference value L and the increase in length when the surface paper is stretched is ΔL. % ΔL / L × 100 (%) of the increase ΔL relative to or the percentage ΔL / when the length of the surface paper before creping is the reference value L and the decrease in the length after creping is ΔL L × 100 (%). When the surface paper 1 is provided with irregularities by creping, the tip of the convex portion of the surface paper 1 has a protruding shape as shown in FIG. 2, and the surface paper 1 provided with irregularities by embossing or other processing is Appearance is different.
[0033]
As the raw material of the surface paper 1, so-called paper can be used. Specific examples include natural persimmon fibers such as straw, trigeminal and cancer skin, non-wood fibers such as hemp, straw, bagasse and kenaf, and hydrophilic fibers such as wood pulp and rayon. These various fibers may be used alone or in combination as composite paper. Further, the surface paper 1 can be made not only in a single layer, but also in a multi-layer, and in that case, the type or blending ratio of the material constituting the layer may be changed for each layer.
[0034]
Furthermore, in order to improve the dimensional stability with respect to indoor environmental humidity conditions, it is preferable that 5 to 100% by weight of recycled pulp of inorganic fiber, hydrophobic synthetic fiber or vegetable fiber is added to the raw material. Examples of the inorganic fiber include glass fiber, micro glass, rock wool, mineral wool, alumina fiber, alumina silica fiber, mullite fiber, boric acid fiber, quartz fiber, silicate glass fiber, fused silica fiber, potassium titanate fiber, zirconia fiber. , Calcium sulfate fiber, phosphate fiber, porosilicate fiber, carbon fiber, activated carbon fiber and the like. Examples of the hydrophobic synthetic fiber include fibers using polyethylene, polypropylene, polyester, acrylic, vinyl acetate, vinylon, nylon, polyvinyl chloride, polyvinylidene chloride, polyurethane, benzoate, and derivatives thereof.
[0035]
Recycled pulp has undergone a drying-rewet cycle one to several times compared to virgin pulp, so the flexibility of the fiber is lost, it is hard to bend and is hard, and the keratinization of the fiber is progressing Therefore, the swellability is reduced during rewetting. In other words, recycled pulp has less water absorption than virgin pulp, and the amount of swelling, that is, volume expansion change is also small. Therefore, the use of recycled pulp for surface paper 1 is extremely effective for dimensional stability of surface paper 1. To work.
[0036]
These fibers may be used alone or in combination with various binder fibers. The blending ratio of the inorganic fiber, the hydrophobic synthetic fiber, or the recycled pulp is not particularly limited. However, as the blending ratio increases, the volume fluctuation width of the surface paper 1 decreases, so that the unevenness formed on the surface paper 1 increases. The thickness and the width can be reduced, and the range of selection of the material and thickness of the film-like fixed layer 2 is increased.
[0037]
In addition to this, various fillers and organic binders may be added to the surface paper 1 as necessary. As the filler, silicates such as wax, kaolin, sericite, talc and zeolite, calcium carbonate, titanium dioxide, aluminum hydroxide, alumina, magnesia and the like can be used. Examples of the organic binder include water-soluble urea resin, melamine resin, cationized starch, CMC, epoxy resin, polyimine resin, water-soluble acrylic resin, paper strength enhancer such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and maleic acid. Various sizing agents such as a hydrophilic sizing agent, a rosin sizing agent, a polymer resin emulsion, and a rubber latex can be used.
[0038]
Further, a decorative design or the like may be decorated on the surface of the front paper 1 by applying vinyl chloride or printing or directly attaching a different material such as a fabric. In this case, the unevenness may be formed after forming the unevenness on the surface paper, or may be applied or pasted after applying the above application or the like or pasting on the surface paper. In addition, when the said different material has an appropriate unevenness | corrugation, you may provide an unevenness | corrugation by bonding paper along this dissimilar material.
[0039]
Then, the surface paper subjected to the decoration process as described above may be further subjected to processing necessary for wallpaper or screen paper such as stain prevention, flame-retardant processing, non-combustion processing, and foam embossing.
[0040]
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 unevenness, and further absorbs changes in the unevenness of the surface paper 1. It has the function of completely absorbing a very small amount of stretching force of the face paper 1 that could not be resolved. Therefore, as the film-like fixing layer 2, a hydrophobic film having elasticity that can be wound into a roll and having good dimensional stability against changes in the temperature and humidity of the living environment is suitable. . The film-like fixing layer 2 also has a function of preventing the adhesive from penetrating from the pressure-sensitive adhesive layer 3 to the surface paper 1 and further strengthening the adhesion between the surface paper 1 and the pressure-sensitive adhesive layer 3. Yes. Specific examples of the material for the film-like 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. It is necessary to select the thickness of the film-like fixing layer 2 to such an extent that the stretching force due to moisture absorption and moisture release of the surface paper 1 is not transmitted to the pressure-sensitive adhesive layer 3. Specifically, the thickness of the film-like fixing layer 2 is 10 μm to 100 μm. The range is appropriate.
[0041]
Adhesion between the surface paper 1 and the film-like fixing layer 2 is performed by a wet or dry laminator. As wet laminating adhesive, vinyl acetate emulsion, EVA emulsion, acrylic emulsion, etc. can be used, and as dry laminating adhesive, EVA or block rubber hot melt resin, synthetic rubber latex, polyurethane, etc. It can be used.
[0042]
And when using polyolefin-type films, such as polyethylene and a polypropylene, as the film-like fixing layer 2, the polyolefin-type film is extruded in the form of a molten film by extrusion laminating, and is pressed and pasted on the surface paper 1 which has been previously uneven. be able to. In this case, the surface paper 1 and the film-like fixing layer 2 are bonded together with a pressing force such that the convex portion of the surface paper 1 is bonded to the film but the concave portion is not bonded. According to the extrusion laminate, it is not necessary to use an adhesive for bonding the surface paper 1 to the film-like fixing layer 2.
As shown in FIG. 1 or FIG. 2, a pressure-sensitive adhesive layer 3 is attached to the surface of the film-like fixing layer 2 opposite to the side to which the convex portion of the face paper 1 is bonded. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 3, either a permanent adhesive pressure-sensitive adhesive or a re-peelable pressure-sensitive adhesive can be used. In other words, those that can be peeled off at the time of affixing work and that have permanent adhesiveness after the work is completed are preferable. Although the thickness of the adhesive layer 3 can be suitably set in the range of 5 μm to 180 μm, the range of 20 to 60 μm is more preferable. In addition, when the unevenness | corrugation is provided in the adhesive layer 3 so that it may mention later, it is preferable at the point of appearance that the minimum thickness and the maximum thickness exist in the range of 5 micrometers-180 micrometers.
[0043]
When a permanent adhesive type adhesive is used as the adhesive layer 3, an ultrathin layer 3a of a release agent is formed on the surface of the adhesive layer 3 as shown in FIG. It is preferable to provide unevenness on the entire surface or part of the surface of the agent layer 3. In this way, when the pressure-sensitive adhesive paper sheet is affixed with a light pressure, the peelable ultrathin layer 3a is present on the surface of the pressure-sensitive adhesive layer 3 in the former case, 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 reattached when reapplying. The former and latter processes may be performed together.
[0044]
Here, the release sheet 4 will be described. Usually, release paper for wallpaper or wallpaper is laminated with a film made of polyolefin resin such as polyethylene to prevent penetration of the release agent into release paper such as 30-100 g / m2 high-quality paper and kraft paper. Then, a silicone release agent is applied by 0.1 to 1 g / m 2 with a coater head, and the release agent is cured by heating, UV or EV treatment. As the release sheet 4 in the present invention, an appropriate one for the surface paper 1 is selected from the normal release sheets as described above.
[0045]
Now, as shown in FIG. 3, in order to form the ultrathin layer 3a of the release agent on the surface of the pressure-sensitive adhesive layer 3, more release agent 4a such as silicone is added on the release sheet 4, specifically 0. It is applied in the range of about 1 to 10 g / m2.
[0046]
When a permanent adhesive is used as the pressure-sensitive adhesive layer 3, the surface of the pressure-sensitive adhesive layer 3 is impregnated very thinly by applying a large amount of the release agent 4 a on the release sheet 4. It is possible to form on the surface of the pressure-sensitive adhesive layer 3 a peelable ultrathin layer 3a mainly composed of the component 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 ultrathin film mainly composed of a release agent 4a such as silicone existing on the surface of the pressure-sensitive adhesive layer 3 is used. Due to the re-peeling property of the layer 3a, it becomes possible to repeat the peeling and bonding two or three times. When the re-sticking is completed, the pressure-sensitive adhesive layer 3 is strongly pressed from above the surface paper 1 to destroy the ultrathin layer 3a, so that the permanent pressure-sensitive adhesive 3 exhibits its original adhesiveness and is firmly covered. Adhere to the adhesive.
[0047]
On the other hand, as a method of giving unevenness to the entire surface or a part of the pressure-sensitive adhesive layer 3, a pressure coater is previously applied to the entire surface of the release sheet 4 with a roll coater and then partially coated by a gravure roll method, or vice versa. There is a method of applying the adhesive to the release sheet 4 in order, and then bonding the release sheet 4 and the film-like fixing layer 2 with the surface on the adhesive layer 3 side facing the film-like fixing layer 2.
[0048]
Further, a method is used in which the release sheet 4 is provided with unevenness in advance by embossing or other methods, and an adhesive is applied and dried on the release sheet 4 having the unevenness with a roll coater or the like and then bonded to the film-like fixed layer 2. May be. The pressure-sensitive adhesive paper sheet thus produced has a cross-sectional structure as shown in FIG. In JP-A-8-142247, an adhesive sheet having a three-layer structure composed of a surface sheet layer, an adhesive layer and a release layer is subjected to embossing at the same time in three layers, and a convex portion is provided on the adhesive layer. However, a method of embossing at a time in a state where a plurality of layers are stacked is not preferable. Because, in reality, the pressure for embossing during embossing is a high pressure of 100 to 250 kg / cm in linear pressure, so that not only the release sheet but also the pressure-sensitive adhesive layer has a pressing force, and the pressure-sensitive adhesive layer sticks. This is because the agent may flow out. In that case, the uneven portions formed on the pressure-sensitive adhesive layer must be extremely thin, and the thickness of the pressure-sensitive adhesive layer itself is considerably thin, which may result in insufficient adhesive force.
[0049]
Other methods for providing the pressure-sensitive adhesive layer 3 with irregularities include the following methods.
[0050]
A silicone release agent having an amount in the range of 0.5 to 2 g / m 2 is applied to the release sheet 4 laminated with a polyolefin or polyester film having a thickness of 10 to 20 μm, and the pressure-sensitive adhesive is applied thereon with a roll coater. The pressure-sensitive adhesive layer 3 is formed by applying uniformly. In order to form an extremely thin layer of release agent on the surface of the pressure-sensitive adhesive layer 3, it is preferable to apply a large amount of silicone release agent on the release paper.
[0051]
Next, as shown to Fig.5 (a), the state with which the peeling sheet 4 which affixed the adhesive layer 3 on the other side of the film-like fixing layer 2 which adhere | attached and fixed the surface paper 1 on one side was bonded together Is wound in a roll shape on a large diameter core 5a of 75 to 150 mm so that the surface paper 1 side is on the inner side and the release sheet 4 is on the outer side, and a parent roll 6 having a diameter of 500 to 1000 mm is produced. To do.
[0052]
Then, the adhesive paper sheet is unwound from the parent roll 6, and this time, as shown in FIG. 5 (b), with the release sheet 4 inside, the roll is wound around a small core 5b with a diameter of 25 to 50 mm. A child roll 7 having a thickness of 50 to 100 mm is produced. In this case, the release sheet 4 is wound inward by the total length of the thickness of the surface paper 1, the pressure-sensitive adhesive layer 3, and the release sheet 4 itself. Therefore, the release sheet 4 is deformed in a wave shape to absorb the length. In this way, irregularities are automatically formed on the release sheet 4. At this time, since the pressure-sensitive adhesive layer 3 has fluidity, the pressure-sensitive adhesive layer 3 also has irregularities.
[0053]
Note that minute unevenness may be formed on the release sheet 4 in advance. In this case, it is effective for solving troubles when the adhesive paper sheet is wound from the large-diameter roll-shaped parent winding 6 to the child winding 7 with a predetermined size. That is, when the adhesive paper sheet is wound with its front and back reversed, the change in length thereof is absorbed to some extent on the release sheet 4 side, thereby “floating (tunneling)” of the release sheet 4 that occurs during child winding. Can be resolved. In addition, the so-called “floating wrinkles” and “squeezed wrinkles” that are generated on the surface paper 1 when the rolled-up adhesive paper sheet is unrolled and made flat can be eliminated.
[0054]
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 bonded to the fixing layer 2 after forming irregularities directly with an embossing roll or the like. In this case, when forming unevenness on the pressure-sensitive adhesive layer 3, the release sheet 4 is a flexible film that can be expanded and contracted in order to effectively transmit the pressing force such as the emboss roll 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.
[0055]
When the pressure-sensitive adhesive layer 3 is a permanent adhesive and a pressure-sensitive adhesive emulsion made of a resin component is used, the re-sticking operation is performed in the same manner as described above by weakening the initial adhesive force while leaving a part of the dispersion medium. Can be easily performed. In this case, the pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer 3 uniformly provided on the entire surface thereof is wound up to a predetermined length, and hermetically sealed in order to prevent the dispersion medium from evaporating.
[0056]
The release sheet 4 can be omitted when the adhesive paper sheet is commercialized in a rolled state. Specifically, the surface of the surface paper 1 fixed to the film-like fixing layer 2 is subjected to a predetermined decorating treatment and then covered with an acrylic resin or a polyolefin-based resin to protect the surface, and silicone is coated thereon. More than usual, 0.5 to 10 g / m 2 is applied and then dried to give a peeling function. This is for improving the peelability of the surface paper 1 and forming a peelable ultrathin layer on the surface of the pressure-sensitive adhesive layer applied to the surface paper 1 in the next step. Next, the pressure-sensitive adhesive is applied and dried on the surface paper 1 having a peeling function to form the pressure-sensitive adhesive layer 3, and in this state, on the winding core 8 as shown in FIGS. And roll 9 is formed. At this time, the unevenness of the surface paper is automatically transferred to the pressure-sensitive adhesive layer 3.
[0057]
Then, as illustrated in the enlarged portion of FIG. 7B, the pressure-sensitive adhesive layer 3 is caused to become the film-like fixing layer 2a by the pressing force F acting from the film-like fixing layer 2a outside the pressure-sensitive adhesive layer 3 at the time of winding. Adhere to. The roll 9 is maintained for a predetermined time until the pressure-sensitive adhesive layer 3 is firmly adhered to the film-like fixing layer 2a, and is preferably shipped in this state.
[0058]
In use, the roll 9 is unrolled. Since the surface of the surface paper 1 has a peeling function, the pressure-sensitive adhesive layer 3 can be easily peeled off from the surface paper 1. And the unevenness | corrugation corresponding to the surface shape of the surface paper 1 will be formed in the adhesive layer 3 peeled from the surface paper 1. FIG.
[0059]
In this case, since the surface paper 1 has a function as a release sheet, it is not necessary to use a separate release sheet. Further, since the surface of the surface paper 1 is coated with silicone, the surface paper 1 can be prevented from being stained.
[0060]
Moreover, since the surface of the pressure-sensitive adhesive layer 3 copies the unevenness of the surface paper, the unevenness is formed. Therefore, re-peeling is possible after temporary attachment, and after temporary attachment without wrinkles and positioning, it is possible to increase the contact area with the adherend by pressing strongly with a brush or the like to perform permanent adhesion It becomes possible.
[0061]
In addition, since the peelable ultrathin layer is formed on the surface of the pressure-sensitive adhesive layer 3, it exists on the surface of the pressure-sensitive adhesive layer 3 when the pressure-sensitive adhesive layer 3 is lightly pressed and bonded to the adherend. Due to the re-peeling property of the ultra-thin layer mainly composed of silicone, it is possible to repeat the peeling and bonding 2-3 times.
[0062]
【Example】
The elongation in water of a surface paper having a paper thickness of 180 μm (0.18 mm) and 100 g / m 2 produced at a blending ratio of 90% recycled pulp and 10% virgin pulp was 0.8%.
[0063]
Next, the surface paper was embossed to form irregularities. Here, when an adhesive paper sheet is produced using the surface paper 1, in order to absorb the change in the area of the surface paper, if the paper thickness is ignored, an unevenness ratio of 0.8% or more can be provided. That's fine. Therefore, since the surface paper has a thickness of 180 μm, the depth of the embossed plate was set in the range of 90 μm to 1.8 mm to provide unevenness.
[0064]
When the polypropylene film having a thickness of 30 μm was bonded to the back surface of the surface paper provided with the irregularities by extrusion lamination and the elongation in water was measured, it was less than 0.1%.
[0065]
Then, the pressure-sensitive adhesive sheet side of the release sheet, on which the pressure-sensitive adhesive layer had been formed in advance, was bonded to the surface of the polypropylene film on which the surface paper provided with the unevenness was not adhered to produce a pressure-sensitive adhesive paper sheet. The pressure-sensitive adhesive paper sheet obtained in this way floated on the pressure-sensitive adhesive surface with the adherend in a normal use environment, and no wrinkles, sagging, peeling, etc. occurred.
[0066]
【The invention's effect】
In the present invention, the volume change due to moisture absorption and moisture release of the surface paper is converted into a change in the height of the unevenness of the surface paper itself, so that the apparent area of the surface paper is kept constant and the peel force to the adhesive layer Can be eliminated. Therefore, floating, wrinkles, sagging, and peeling can be suppressed, and the finish at the time of pasting can be maintained.
[0067]
Moreover, it becomes possible to absorb the said peeling force completely by arrange | positioning the film-like fixing layer for fixing the said surface paper between the said surface paper and the said adhesive layer.
[0068]
And by providing unevenness on the entire surface or part of the release sheet or the pressure-sensitive adhesive layer, or by forming an ultrathin layer mainly composed of a release agent on the surface of the pressure-sensitive adhesive layer, apparently the initial adhesive force Thus, 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, it is possible to reduce the initial adhesive force and easily perform the re-sticking operation as described above. be able to.
[0069]
Furthermore, the release sheet can be made unnecessary by adding a function as a release sheet on the surface of the surface paper.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view illustrating 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 an adhesive paper sheet of the present invention in which unevenness is provided on a surface paper by creping.
FIG. 3 is a schematic cross-sectional view showing an embodiment of an adhesive paper sheet of the present invention in which an ultrathin layer of a release agent is formed on the surface of an 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 irregularities in advance is used.
FIG. 5 is a schematic cross-sectional view showing an example of an embodiment of a method for producing an adhesive paper sheet of the present invention.
FIG. 6 is a schematic cross-sectional view for illustrating an embodiment of the pressure-sensitive adhesive paper sheet of the present invention when the unevenness is directly formed on the pressure-sensitive adhesive layer and then bonded to the film-like fixing layer.
FIG. 7 is a schematic cross-sectional view for illustrating another example of the embodiment of the method for producing an adhesive paper sheet of the present invention.
[Explanation of symbols]
1 Surface paper
2, 2a Film-like fixed layer
3 Adhesive layer
3a Ultra-thin layer
4 Release sheet
4a Release agent
5a Large diameter core
5b Small core
6 Parent roll
7 rolls
8 Roll core
9 rolls

Claims (16)

In the pressure-sensitive adhesive sheet provided with a surface paper and a pressure-sensitive adhesive layer, and having a release sheet on one surface of the pressure-sensitive adhesive layer,
Forming unevenness on the surface paper to absorb the expansion and contraction of the surface paper itself due to a change in humidity, and fixing the surface paper between the surface paper and the other surface of the pressure-sensitive adhesive layer An adhesive paper sheet comprising a film-like fixed layer. The pressure-sensitive adhesive paper sheet according to claim 1, wherein the unevenness of the surface paper is formed by embossing or creping. The pressure-sensitive adhesive paper sheet according to claim 1, wherein the release sheet is provided with irregularities. The pressure-sensitive adhesive paper sheet according to any one of claims 1 to 3, wherein unevenness is provided on the entire surface or a part of the surface of the pressure-sensitive adhesive layer. The pressure-sensitive adhesive paper sheet according to any one of claims 1 to 4, 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 packaged. The pressure-sensitive adhesive paper sheet according to any one of claims 1 to 5, wherein a function as a release sheet is added on the surface of the surface paper. The pressure-sensitive adhesive paper sheet according to any one of claims 1 to 6, wherein 5 to 100% by weight of recycled pulp is blended in the surface paper. The pressure-sensitive adhesive paper sheet according to any one of claims 1 to 7, wherein 5 to 100% by weight of hydrophobic fibers are blended in the surface paper. The pressure-sensitive adhesive paper sheet according to any one of claims 1 to 8, wherein an ultrathin layer of a release agent is formed on the surface of the pressure-sensitive adhesive layer. A step of forming irregularities on the surface paper, a step of adhering the surface paper to one surface of the film-like fixing layer, a step of applying an adhesive to the release surface of the release sheet and drying to form an adhesive layer, the fixing layer The manufacturing method of the adhesive paper sheet which consists of a process which affixes the said adhesive layer on the other surface of this. The method for producing an adhesive paper sheet according to claim 10, wherein embossing or creping is performed in the step of forming irregularities on the surface paper. The manufacturing method of the adhesive paper sheet of Claim 10 or 11 including the process of providing an unevenness | corrugation in the said peeling sheet. The manufacturing method of the adhesive paper sheet in any one of Claims 10 thru | or 12 including the process of providing an unevenness | corrugation in the whole surface or a part of surface of the said adhesive layer. The manufacturing method of the adhesive paper sheet in any one of Claims 10 thru | or 13 including the process of airtightly packaging the adhesive paper sheet whole. The manufacturing method of the adhesive paper sheet in any one of Claims 10 thru | or 14 including the process of adding the function as a peeling sheet on the surface of the said surface paper. The manufacturing method of the adhesive paper sheet in any one of Claims 10 thru | or 14 including the process of forming the ultra-thin layer of a peeling agent on the surface of the said adhesive layer.

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