JP2772249B2 - Thermal adhesive paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sticking paper which can be suitably used as a backing paper for a wall paper, a sliding paper, a shoji paper, and a calligraphy.

[0002]

2. Description of the Prior Art The applicant of the present invention has previously disclosed in Japanese Utility Model Publication No. 63-50320, as a shoji paper, a "heat-bonded shoji paper" which can be easily replaced by heating and pressing with an iron or iron. In Japanese Patent Publication No. 5-77800, the use of steam iron has been improved so that a paper sheet material having a larger area than a heated surface such as wallpaper, fusuma paper, shoji paper, and backing paper for a calligraphy can be stuck without wrinkles. A heat bonded paper sheet "has been disclosed.

[0003] However, when this conventional heat-bonded paper is applied to shoji paper, gloss (shininess) is generated due to melting of a resin layer as a heat-adhesive, and it becomes unsightly. It is necessary to completely melt the heat adhesive on the bonding surface by heat, which also has the disadvantage that it takes time and effort.

In order to solve this drawback, the resin layer is applied in the form of islands or lines, and the resin layer serving as a thermal adhesive is made of a water-soluble resin. The development of a so-called water-soluble resin heat-adhesive adhesive paper that reduces the proportion of the heat-adhesive occupied, makes gloss (shininess) less noticeable, and can be easily peeled off by soaking in water when replacing. Attempted.

[0005]

However, this water-soluble resin heat-adhesive paper has inconvenience in use even though it is easy to replace it.

[0006] In particular, in the case where paper is used as a shoji paper and the paper is pasted, the paper is sprayed and water is added to remove the paper. It will be absorbed by the water-soluble resin used, and will leave the shape of a water droplet forever after pasting. In order not to leave the shape of this water drop,
If the amount of spraying is increased, water penetrates into the water-soluble resin on the bonding surface and peels off, and it is extremely difficult to finish uniformly with water. In addition, it is dew condensation on glass by window shoji, and relative humidity by moisture is 80%
In this case, the water-soluble resin absorbs moisture, and the paper sheet becomes wet and sticky, causing dust to be generated.

[0007] An object of the present invention is to provide a heat-adhesive paper sheet which can save time and effort in re-sticking and has an excellent finished state.

[0008]

Means for Solving the Problems According to the present invention, after transferring, spraying, spraying or applying a thermal adhesive resin to a bonding surface of a paper sheet substrate in a discontinuous island shape, the thermal adhesive resin is applied to a paper sheet substrate.
A heat-bonded adhesive sheet which is heat-fused by 0 to 50%, characterized in that the heat-fused heat-resin resin maintains a spherical or hemispherical island shape.

The thermal adhesive resin formed in a discontinuous island shape on the adhesive surface of the paper sheet substrate has a thickness of 1/1 of the thickness of the paper sheet substrate.
It is desirable that the particle size is 0 to 2 times, and the adhered resin after heat melting hardly penetrates into the paper sheet substrate. From this point, it is desirable that the heat-bonding resin disposed in the discontinuous island shape on the bonding surface of the paper sheet base material is formed into dots.
Specifically, in the case of shoji paper, the thickness of the paper is 100 μm to 18 μm.
0 μm, the particle size of the thermal adhesive resin is 10 μm to 360 μm.
μm, but preferably up to 180 μm, which is about one time.

Further, when the depth of the dent on the surface of the shoji paper is measured, the average dent depth is 11 μm on the smooth surface and 25 μm at the maximum.
m, average depression depth 20 μm on rough surface, maximum 40 μm
In addition, since the minimum diameter of the wood fiber (pulp) used as a raw material of shoji paper is 11 μm for hemlock and 64 μm for fir tree, the size of the thermal adhesive resin particle is Therefore, the minimum is a size that does not sink into the depression of the shoji paper, 11μm or 20μ of the average depression depth
m, which is set according to the depth of the depression on the surface of the paper.

The maximum is preferably such that it does not seep out to the side opposite to the bonding surface of the paper when bonded by heat. Therefore, in the case of ordinary paper, the thickness is about the same as the paper thickness, that is, about 100 μm to 180 μm, but a paper having a structure in which the heat-melted resin does not penetrate, for example, a film having a melting point higher than the melting point of the bonding resin is applied to one side of the paper. If it is provided on both sides or in the middle, the thickness may be up to twice the thickness of the paper sheet material.

Further, the maximum length (width) of the major diameter (width) of the wood fiber (pulp) used as the raw material of the shoji paper is about 190 μm.
The extent is the size limit.

In FIG. 1, the ratio of the area of the island of the heat-bonding resin to the area of the sea without the resin is related to the degree of reflection (degree of reflection) of the surface on the heat-bonding side of the shoji paper.

Generally, it is desirable that the ratio of the area of the sea to the total area of the islands is in the range of 9: 1 to 1: 9.

In the case of shoji paper, when the island is empirically flat, the total area of the island is at most 60%, preferably 50%, based on the degree of reflection, and the minimum is to maintain the adhesive strength to the shoji frame. %. When the island is high, especially when it is close to a sphere, the reflection structure that can be seen is a point reflection that is close to one point from one island, and the other is invisible because it is not seen. , Is 90%, preferably 80%.

Further, the minimum of the total area of the island is regulated by the adhesive force and is about 10%, preferably about 20%.

The amount of the heat-adhesive resin which can adhere to the shoji paper to the shoji frame and withstand changes in the temperature and humidity of the natural environment varies depending on the type of the resin, but is preferably 5% to 60% of the basis weight of the shoji paper, but is preferable. Is 5% to 30%.

As the paper base material, a "paper sheet material" disclosed in Japanese Patent Publication No. 5-77800 can be used. Paper substrates with improved dimensional stability to change are preferred.

As the hydrophobic fibers, those having good dimensional stability to heat at the heat bonding operation temperature from among "hydrophobic heat-shrinkable fibers", "inorganic fibers" and "vinylon fibers" disclosed in the above-mentioned publication. You can choose.

Further, a composite paper base material provided with a layer such as a film for preventing the transfer of the thermal adhesive resin on one side, both sides or the middle of the above-mentioned paper base material can be used.

For example, a layer of a resin film that does not melt at the heat bonding operation temperature is provided by lamination or coating.

Examples of the laminated film include polyester, cellophane, polyolefin and the like. The coating layer is composed of starch or EVA emulsion alone or in combination.

In this case, the lack of air permeability means that there is no transfer or leaching of the heat bonding resin.

Further, as a resin to be selected, a "thermosensitive adhesive" disclosed in Japanese Patent Publication No. 5-77800 is preferably used. However, it is preferable that the adhesive strength and hand feeling which are not influenced by the change of moisture are impaired. L with no properties
DPE type, EVA type, modified EVA type, polyester type,
Polyamide-based, modified PE-based, ionomer-based and the like can be suitably used, but water-soluble modified PVA-based and the like are not preferred because their adhesive strength and feeling are affected by changes in moisture. The melting point may be selected from those of 60 ° C. to 150 ° C. depending on the application.

The island-like or linear form of the heat-adhesive resin can be formed by spraying or applying the resin material as a crushed powder by a powder scatter method or a powder dot method, or by applying a powder to a solvent by a paste dot method. After being put into a paste and transferred from a screen roll to a paper substrate, it is formed by hot-melt bonding to the paper substrate through a heating device.

In the transfer method, the powder can be heated and melted, transferred from a screen roll to a paper substrate, and then cooled to form the powder.

Further, the resin emulsion is formed by spraying onto a paper substrate by spraying, or by applying the emulsion onto a gravure plate, transferring to a paper substrate and heating to remove the solvent. Furthermore, not only the above-mentioned methods may be used alone, but also the processing may be performed in combination, and the dot processing may be performed by overlapping two or three types of resins having different substitution or compatibility with each other.

The thermal adhesive resin may be formed on the shoji paper by any of the methods described above, but it is preferable that the thermal adhesive resin is formed in an island shape and as close to a spherical shape as possible. As shown in the adhesive interlining for garments, those which are flatly crushed or in which the dots are excessively dissolved and seep into the substrate are not suitable.

Because the clothing interlining is heated and pressurized on an elastic ironing board, the heat transfer and the pressure are sufficiently transmitted and the adhesion is easy, but the shoji paper is ironed into the shoji frame. When attaching, the shoji frame is hard and not flat, so that sufficient heat and pressure for thermal bonding are insufficient.
In order to solve this, the height (thickness) of the island-shaped dots of the heat bonding resin is required. If the twist or the concave portion of the shoji frame is shallower than the height of the island-shaped dots, the concave portion can be bonded, and a strong adhesive force can be obtained.

The temperature conditions for forming highly spherical island-like dots of the heat bonding resin on the paper substrate differ depending on the melting point of the resin, the processing speed, the basis weight of the paper substrate, the amount of the resin and the particle size. , Resin powder or paste dots
An amount of heat for melting 0% to 50% is sufficient. Applying more heat undesirably sinks into flat islands or into the paper substrate.

[0031]

[Action] The fact that the resin adhered by melting only the surface to the paper sheet substrate by heating and melting maintains the spherical or hemispherical shape after the melting is, in terms of the degree of light reflection on the surface of the paper substrate, the resin. Because the spherical surface of is melted and is in a state of a fine convex mirror, only one point of light (reflection) from one island (sphere) enters the eyes, and the rest is irregularly reflected, so no resin is applied. It becomes smaller than the degree of reflection of the paper substrate (sea part).

Further, assuming that the area where the thermal adhesive resin is not applied to the paper substrate is constant, the higher the island, that is, the closer to the sphere, the greater the amount of resin, and therefore the adhesive force is improved.

Further, when the object to be bonded is hard and twisted or uneven as in a shoji frame, and when the height of the spherical thermal adhesive resin of the heat bonding adhesive paper is larger than the height of the unevenness of the object to be bonded, the resin is coated. Since it can be adhered in contact with the adhesive, it contributes to improving the adhesive strength.

Further, since the amount of the resin is 50% or less as compared with the case where the heat-adhesive resin is laminated, the peeling operation becomes easy by reheating, and the air permeability is maintained at the same level as the conventional shoji paper. The surface of the thermal adhesive resin dots provided on the paper base material is heated and melted after application to form a convex mirror, so even if re-heated to adhere to the shoji frame, the dot state of the non-adhered part changes Since there is no shrinkage, that is, no unevenness of shine is produced, it is possible to easily apply the shoji by ironing the entire shoji.

[0035]

EXAMPLE A resin powder of a saponified ethylene vinyl acetate copolymer was sprayed on the surface of a paper sheet 1 shown in FIG.
The resin dots 2 having a particle diameter of 10 to 2 times as large were distributed. The resin dots 2 were melted by heating.

Specifically, the melting point is 97 ° C. and the average particle size is 10
Pulp 65%, rayon 25%, vinylon 5 with 0 μm, minimum particle size 45 μm and maximum particle size 150 μm
% And a binder of 5% were applied to a paper base material having a basis weight of 55 g / m 2, which was then sprayed with 6 g / m 2 by a powder scatterer method and then heated and melted to form a spherical shape (c) and a hemispherical shape (b) on the paper base material. .

FIG. 2 schematically shows the state of the resin melt 3 after melting. In the figure, (a) shows the resin dots in the sprayed state, and (b) and (c) show the state of the resin melt after the melting process. In these situations,
FIG. 2B shows that the melted resin melt 3 partially penetrates into the paper sheet 1 to form the permeable layer 4, but has a hemispherical shape on the paper sheet material 1. In the case of FIG. 3C, the dissolved resin hardly penetrates into the paper sheet, and a substantially spherical shape is maintained on the paper sheet material 1. these,
In the case where the heat bonding adhesive paper is replaced in the state of the adhesive resin shown in (b) and (c), the upper surface of the adhesive resin melt 3 shown in (b) and (c) comes into contact with the other party. .

[0038]

The heat-bonded adhesive sheet of the present invention can be easily peeled off and can obtain an excellent finished state by spraying.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and shows a state in which a resin is distributed in a spot-like manner.

FIG. 2 shows a shape of the resin shown in FIG. 1 after being melted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper sheet material 2 Distribution resin 3 Hot melt resin 4 Permeation layer of hot melt resin

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C09J 7/02 C09J 7/04 D21H 27/00

Claims (4)

(57) [Claims] 1. A heat-bonded adhesive sheet obtained by applying a heat-bonding resin to a bonding surface of a paper sheet substrate in a discontinuous state and then heating and melting the heat-bonding resin. A heat-bonded adhesive sheet which maintains a spherical or hemispherical shape after heating and melting the applied heat-bonding resin. 2. The heat-adhesive resin has a particle size of 10 μm to 36 μm.
2. The heat-bonded adhesive paper according to claim 1, wherein the thickness is 0 μm . Wherein one surface of the paper sheet substrate, in either both sides or intermediate, bonded thermal bonding according to claim 1 or 2 characterized in that a film layer for preventing the transfer of heat adhesive resin
paper. 4. The method according to claim 1, wherein the paper sheet substrate has a temperature change or a humidity change.
5 hydrophobic fibers to improve dimensional stability against
Claims, characterized in that is obtained by 100% blended
The heat-adhesive pasting paper according to any one of claims 1 to 3.