JP2006182810A - Heat bonding sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat bonding sheet firmly bondable to the surface of an adherend even in the case of applying small heat quantity to an adhesive layer laminated to one surface of a substrate. <P>SOLUTION: The invention provides a heat bonding sheet composed of a sheet-like substrate and an adhesive layer laminated to one surface of the sheet-like substrate and containing a heat bondable resin having an MFR (melt flow rate) of 100-220; and a heat bonding sheet composed of a sheet-like substrate and an adhesive layer laminated to one surface of the sheet-like substrate and containing a heat bondable resin having viscosity of 1,000-11,000 Pa×s. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a thermal adhesive sheet. More specifically, the present invention relates to a heat-adhesive sheet that can be attached to the surface of an adherend such as a wall, ceiling, fence, shoji, or flooring using heat of an iron or the like.
The object of the present invention is to provide a thermal adhesive sheet that can be firmly adhered to the surface of an adherend even when the amount of heat applied to the adhesive layer laminated on one surface of the substrate is small. It is to provide.

Thermal adhesive sheets that can be easily attached to the surface of adherends such as walls, ceilings, fences, shoji, and flooring materials by heat and pressure from heat sources that exist in general households such as steam irons are known. This heat-adhesive sheet is used as iron-coated paper or shoji paper.
Conventional heat-adhesive sheets are made by laminating a heat-adhesive resin on one side of a substrate, and by using a heat source such as a steam iron, the heat-adhesive resin is heated, melted and pressurized. The heat-adhesive sheet can be attached to the surface of the adherend.

As inventions related to such heat-adhesive sheets that can be used as ironed paper or shoji paper, those disclosed in Patent Documents 1 to 5 are known.
Patent Document 1 discloses a thermoplastic and heat-shrinkable pressure-sensitive adhesive on one surface of a steam-permeable paper sheet material in which unevenness whose size changes with temperature and humidity changes is provided by creping or embossing. A heat-bonded paper sheet is disclosed which is provided with a layer of an agent and enables bonding by using a steam iron.
Patent Document 2 discloses a thermal adhesive sheet in which a granular material made of a hot-melt adhesive material is attached to one surface of a paper sheet material.
Patent Document 3 discloses a heat-bonding adhesive paper obtained by applying a heat-bonding resin to a non-continuous island shape on a bonding surface, and then heat-melting the heat-bonding resin. A heat-bonding adhesive paper that maintains the spherical or hemispherical shape of the island is disclosed.
Patent Document 4 discloses a shoji paper in which granular heat-adhesive resin is distributed and attached to one side of shoji paper, and a water-insoluble heat-adhesive resin and a water-soluble heat-adhesive are bonded in the heat-adhesive resin particles. A thermal adhesive shoji paper in which a specific amount of the adhesive resin is mixed is disclosed.
Patent Document 5 discloses a heat-bonding paper excellent in wet peelability in which a hot melt layer having a thickness of 8 to 30 microns formed of an aqueous dispersion of a thermoplastic hydrophobic polymer is formed on one side of the paper.

Japanese Patent Publication No. 5-77800 JP-A-6-280200 Japanese Patent Laid-Open No. 7-300575 Japanese Patent Laid-Open No. 10-37096 JP 2004-52209 A

The above-described conventional heat-adhesive sheet can be attached to the surface of an adherend such as a bag or shoji using heat from an iron or the like, but has the following problems. It was.
When pasting a conventional heat-adhesive sheet on the surface of the adherend, it was not possible to firmly adhere to the surface of the adherend without using a steam iron. When using a non-steam iron or cordless iron, which has a smaller heat capacity than the steam iron, the adhesive laminated on one side of the base material cannot be melted sufficiently, and is stuck on the surface of the adherend. There was a case that could not be done.
Moreover, when the steam iron for general households is used with its bottom facing the wall surface or ceiling surface, steam does not erupt due to its structure. Therefore, it has been impossible to attach a conventional heat-adhesive sheet that must use a steam iron to a surface such as a wall surface or a ceiling surface.

In addition, even when a steam iron is used as a heat source, a constant pressure and a constant heating time cannot always be applied in order to perform the sticking work by moving the iron by a human hand. And I couldn't stick it beautifully.
That is, in the case of general heat bonding (for example, when a heat sealing machine is used), a constant temperature and a constant temperature can be applied at a constant pressure, so that it can be firmly and beautifully attached. On the other hand, when performing the sticking work using an iron as in the present invention, the applied pressure is about 1/50 to 1/300 when using a heat sealing machine in order to perform the work by human hands ( Specifically, in the work by human hands, the pressure is about 0.8 × 10 ⁴ N / m ^{2 to} 5.0 × 10 ⁴ N / m ² ). The temperature also varied, and as a result, it was not possible to stick beautifully and firmly.

Moreover, the conventional heat-adhesive sheet cannot be said to have sufficient adhesive force to the adherend surface. For this reason, in order to ensure sufficient adhesive force with respect to a to-be-adhered body, when the adhesive was melted and pressed with a heat source such as an iron, a strong pressing force had to be applied with the iron or the like.
On the other hand, when a strong pressing force is applied, a strong adhesive force can be secured, but the unevenness of the adherend itself and the traces of the cross appear on the surface of the heat-adhesive sheet and can be stuck beautifully. could not.
Furthermore, since the conventional heat-adhesive sheet does not have sufficient adhesive strength to the surface of the adherend, it should be attached to the surface of the adherend with irregularities formed on the surface, such as fiber walls or sand walls. Was difficult.

  As a result of diligent research to solve the above-mentioned problems, the present inventors have focused on the fluidity in the molten state of the heat-adhesive resin laminated on the surface of the base material, so that a low pressing force and a low heating temperature can be obtained. Even if it exists, it discovered that a heat adhesive sheet | seat was beautifully and firmly stickable to the to-be-adhered body surface, and came to completion of this invention.

The invention according to claim 1 includes a sheet-like base material and an adhesive layer laminated on one surface of the sheet-like base material, and the adhesive layer has an MFR (melt flow rate) of 100. The present invention relates to a heat-adhesive sheet characterized by containing ~ 220 heat-adhesive resin.
The invention according to claim 2 includes a sheet-like base material and an adhesive layer laminated on one surface of the sheet-like base material, and the adhesive layer has a viscosity of 1000 to 11000 Pa · s. The present invention relates to a heat-adhesive sheet comprising a heat-adhesive resin.
The invention according to claim 3 includes a sheet-like base material and an adhesive layer laminated on one surface of the sheet-like base material, and the adhesive layer is one of the sheet-like base materials. A first adhesive layer laminated so as to be in contact with the first adhesive layer, and a second adhesive layer laminated so as to be in contact with the first adhesive layer, the first adhesive layer comprising: The present invention relates to a heat-adhesive sheet comprising a heat-adhesive resin having a viscosity of 5000 to 11000 Pa · s, and the second adhesive layer containing a heat-adhesive resin having a viscosity of 1000 to 5000 Pa · s.
The invention according to claim 4 relates to the heat-adhesive sheet according to any one of claims 1 to 3, wherein the sheet-like base material contains pulp.
The invention according to claim 5 relates to the heat-adhesive sheet according to any one of claims 1 to 4, wherein the sheet-like base material contains hydrophobic shrinkable fibers.
The invention according to claim 6 relates to the heat-adhesive sheet according to any one of claims 1 to 5, wherein the sheet-like base material is formed with irregularities by creping or embossing. .

The heat-adhesive sheet according to claim 1 can easily melt the adhesive layer even when a heat source having a small heat capacity such as a non-steam iron or a cordless iron is used. Can be easily attached to the surface of the adherend. Moreover, this heat-adhesive sheet has a strong adhesive force with the surface of the adherend, and it is necessary to apply a strong pressing force when the adhesive is melted and stuck to the surface of the adherend using an iron or the like. There is no. Therefore, since the non-steam iron can be used for the heat-adhesive sheet according to the first aspect, it can be directly attached to a wall surface or a ceiling surface. Moreover, even when sticking to a to-be-adhered body in which the unevenness | corrugation was formed on the surface, since an adhesive bond layer melt | dissolves easily, the fuse | melted adhesive enters quickly into an unevenness | corrugation, and can adhere firmly.
The heat-adhesive sheet according to claim 2 can easily melt the adhesive layer even when a heat source having a small heat capacity such as a non-steam iron or a cordless iron is used. Can be easily attached to the surface of the adherend. Moreover, this heat-adhesive sheet has a strong adhesive force with the surface of the adherend, and it is necessary to apply a strong pressing force when the adhesive is melted and stuck to the surface of the adherend using an iron or the like. There is no. Therefore, since the non-steam iron can be used for the heat-adhesive sheet according to claim 2, it can be directly attached to the wall surface or ceiling surface. Moreover, even when sticking to a to-be-adhered body in which the unevenness | corrugation was formed on the surface, since an adhesive bond layer melt | dissolves easily, the fuse | melted adhesive enters quickly into an unevenness | corrugation, and can adhere firmly.
In the heat-adhesive sheet according to claim 3, the adhesive layer is composed of a high-viscosity adhesive layer and a low-viscosity adhesive layer. Adhesiveness is improved because the agent layer first enters the concave and convex dents, and the adhesive layer can be more firmly fixed with a high viscosity adhesive. In addition, the low-viscosity adhesive layer mainly contributes to adhesion to the adherend, and the high-viscosity adhesive layer prevents the low-viscosity adhesive layer from seeping out to the base material, so It can also be prevented from occurring.
The heat-adhesive sheet according to claim 4 can assist the melting of the adhesive layer by evaporating moisture contained in the pulp when sticking to the surface of the adherend.
The heat-adhesive sheet according to claim 5 can prevent the base material from expanding and contracting due to a change in wet temperature after being adhered to the surface of the adherend.
When the heat-adhesive sheet according to claim 6 is applied to the surface of the adherend, the unevenness of embossing or creping absorbs the heat shrinkage even when the base material heat-shrinks. It is possible to prevent the thermal contraction over a wide range in a portion where heat is not applied, and to prevent the generation of wrinkles and flaming.

The thermal adhesive sheet according to the present invention will be described below.
First, the thermal adhesive sheet which concerns on 1st embodiment of this invention is demonstrated, referring drawings.
FIG. 1A is a partial cross-sectional view showing an outline of a thermal adhesive sheet according to the first embodiment of the present invention. The heat-adhesive sheet (1a) according to the first embodiment of the present invention includes a sheet-like substrate (2) and an adhesive layer (3a) laminated on one surface of the sheet-like substrate (2). ).

  Although the material which comprises a sheet-like base material (2) is not specifically limited, Kozo, Mitsumata, cancer skin, hulls and other skin fibers, wood pulp, straw pulp, bamboo pulp, ashi pulp, cotton cylinder pulp, etc. And the like.

  In particular, in the present invention, the base material (2) preferably contains 1 to 100% by weight of pulp, and more preferably contains 50 to 100% by weight. Moisture is present in the pulp, and the moisture present in the pulp evaporates by a heat source such as an iron when being adhered to the surface of the adherend. The evaporated water can play an auxiliary role in melting the adhesive layer (3a), and the adhesive layer (3a) can be reliably melted even when a heat source having a small heat capacity is used. Can do.

  The air permeability (JIS P 8117) of the substrate (2) is not particularly limited, but is preferably 15 seconds or less, and more preferably 10 seconds or less. When the air permeability of the substrate (2) exceeds 15 seconds, heat such as an iron becomes difficult to be transmitted to the adhesive layer (3a), and it may be difficult to melt the adhesive layer (3a).

In the present invention, a fiber having hydrophobic shrinkage can be blended in the substrate (2). Examples of hydrophobic shrinkable fibers include polyethylene, polypropylene, polyester, polyclar, acrylic, vinyl acetate, or derivatives thereof.
When the hydrophobic shrinkable fiber is blended, the base material (2) can be shrunk when the adhesive is melted by a heat source such as an iron. As a result, when the heat-adhesive sheet (1) is adhered to the surface of the adherend, the base (2) can be prevented from being wrinkled or crushed due to thermal shrinkage, and hydrophobic shrinkage. When fibers are blended, the dimensional stability of the paper is improved and the surface of the adherend can be more beautifully attached.
When mix | blending a hydrophobic shrinkable fiber, it mix | blends so that it may become 1 to 100 weight% of the whole base material weight, Preferably it is 5 to 50 weight%.
Although the density of the base material (2) is not particularly limited, 0.3 g / cm ² or more, and preferably from 0.4 to 0.9 g / cm ^2. When the density of the base material (2) is 0.3 g / cm ² or more, the adhesive strength can be prevented from being lowered by preventing the molten adhesive from entering the base material (2). .

After the heat-adhesive sheet (1a) according to the present invention is adhered to the surface of the adherend, the substrate (2) undergoes thermal contraction to some extent, so that wrinkles and flaming are generated on the surface of the substrate (2). You can stick beautifully without having to. However, if the heat shrinkage reaches a wide range, it may cause wrinkles and scum on the surface of the substrate (2). Therefore, in order to prevent the thermal contraction of the base material (2) from reaching a wide range, in the present invention, the base material (2) has an uneven portion (not shown) in which the size of the unevenness changes due to the change of temperature and humidity. Can be formed.
When the heat-adhesive sheet (1a) is adhered to the surface of the adherend, the portion to which heat is applied by a heat source such as an iron is thermally shrunk, but by providing an uneven portion on the substrate (2), The uneven part present at the boundary between the heated part and the unheated part reduces the height and prevents the heat from being applied to a wide area, preventing wrinkles and flaming Can be prevented.
Although the method of forming an uneven | corrugated | grooved part in a base material (2) is not specifically limited, Crepe processing or embossing can be illustrated.
In the case of creping, the crepe rate is not particularly limited, but is 5 to 100%, preferably 5 to 50%.
In the case of embossing, the depth of the embossing roll plate is set to about 1/2 to 50 times the thickness of the base material (2).

  For the base material (2), glass fiber, micro glass, rock wool, mineral cotton, alumina fiber, alumina silica fiber, mullite fiber, boric acid fiber, quartz fiber, silicate glass fiber, molten glass, if necessary. Inorganic fibers such as fiber, titanate glass fiber, zirconia glass fiber, calcium sulfate fiber, phosphate fiber, porosilicate fiber, carbon fiber, and activated carbon fiber may be contained.

  The base material (2) is blended with a paper strength enhancer such as water-soluble urea resin, melamine resin, cationized starch, CMC polyamide polyamine epichlorohydrin resin, polyimine resin, water-soluble acrylic resin, methylcellulose, ethylcellulose, hydroxyethylcellulose, etc. be able to.

In addition, in this invention, although a sizing agent can be mix | blended with a base material (2), when the sizing agent is mix | blended in large quantities, since the fiber which comprises a base material (2) adheres, heat conductivity deteriorates. To do. For this reason, when an iron with a small heat capacity such as a non-steam iron or a cordless iron is used, the adhesive layer (3a) cannot be sufficiently melted, and the base material (2) is stuck to the surface of the adherend. You may not be able to. Moreover, since the expansion and contraction of the base material (2) is inhibited when a large amount of the sizing agent is blended, even if the adhesive layer (3a) can be melted and adhered to the surface of the adherend, In some cases, wrinkles and flamings are likely to occur on the surface of the base material (2) after wearing, and it may not be possible to adhere beautifully.
Therefore, when mix | blending a size agent, it is preferable to mix | blend so that it may become 15 weight% or less of a base material (2) total weight, and it is more preferable not to mix | blend a size agent.

  The thickness of a base material (2) is not specifically limited, It is set as the same grade as normal paperboard, a shoji paper, etc., Specifically, it is about 80-350 micrometers, More preferably, it is about 150-300 micrometers.

  Furthermore, in the present invention, a woven fabric, a knitted fabric, a non-woven fabric, a synthetic resin, a metal foil on the surface of the base material (2) (the surface opposite to the surface on which the adhesive layer (3a) is provided) as necessary. Leather, etc. can be laminated.

An adhesive layer (3a) is laminated on one surface of the substrate (2). The adhesive layer (3a) contains a thermal adhesive resin having an MFR (melt flow rate) of 100 to 220.
Incidentally, MFR is one of the molecular weight indicators and is a scale indicating the fluidity of the resin in a molten state. MFR is expressed in terms of the mass (g) of the molten resin, which is extruded for 10 minutes from a nozzle of a certain size (inner diameter 2 mm) under a predetermined temperature (190 ° C.) and pressure (2160 g load). It is a thing.

  As the thermal adhesive resin, any thermal adhesive resin having an MFR of 100 to 220 can be used. Specifically, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ionomer resin, a urethane resin, or a derivative thereof can be exemplified.

The MFR of the thermoadhesive resin is 100 to 220, preferably 150 to 200. When the MFR of the heat-adhesive resin is 100 to 220, the heat-adhesive sheet (1a) is attached to the surface of the adherend even when a heat source having a small heat capacity such as a non-steam iron or a cordless iron is used. Can be worn. Further, when the adhesive layer (3a) is heated and melted and pressed to adhere the heat-adhesive sheet (1) to the surface of the adherend, the surface of the adherend is not affected by applying a strong pressing force. Can be firmly attached.
When the MFR of the heat-adhesive resin is less than 100, the heat-adhesive sheet does not melt sufficiently due to the heat supplied from a heat source having a small heat capacity such as a non-steam iron or a cordless iron, and the heat-adhesive sheet is stuck on the surface of the adherend. In some cases, sufficient adhesive strength to be worn cannot be obtained.
When the MFR of the heat-adhesive resin exceeds 220, it can be easily melted by the heat supplied from the heat source having a small heat capacity, but on the other hand, since the fluidity is increased, the base material ( It may be difficult to form the adhesive layer (3a) on one side of 2), and productivity may be reduced.

The softening point (180 ° C. ring and ball method) of the heat-adhesive resin is not particularly limited, but is preferably 70 to 130 ° C., and more preferably 90 to 100 ° C.
When the softening point of the heat-adhesive resin is less than 70 ° C., the base material (2) and the adhesive layer (3a) are blocked over time when the heat-adhesive sheet (1a) is wound into a roll. Or the base material (2) and the adhesive layer (3a) may be blocked during shrink wrapping.
When the softening point of the heat-adhesive resin exceeds 130 ° C., the adhesive layer (3a) may not be sufficiently melted by heating / pressing with a heat source of a general household iron, and sufficient adhesive strength may not be obtained. .

The melting point of the thermoadhesive resin is not particularly limited, but is preferably 60 to 120 ° C, and more preferably 70 to 90 ° C.
When the melting point of the heat-adhesive resin is less than 60 ° C., when the heat-adhesive sheet (1a) is wound into a roll, the base material (2) and the adhesive layer (3a) are blocked over time, The base material (2) and the adhesive layer (3a) may be blocked during shrink wrapping.
When the melting point of the heat-adhesive resin exceeds 120 ° C., the adhesive layer (3a) is not sufficiently melted by heating / pressing with a heat source of a general household iron, and sufficient adhesive strength may not be obtained.

Waxes can be blended with the thermoadhesive resin in order to adjust viscosity and prevent blocking.
Examples of waxes include carnauba wax, candelilla wax, montan wax, whale wax, beeswax and the like.
When blending waxes, the blending amount is not particularly limited, but is 1 to 50% by weight, preferably 5 to 15% by weight, based on the total amount of the heat-adhesive resin.
When the amount of the wax is less than 5% by weight, the effect of preventing blocking is poor.
Even if the blending amount of the wax exceeds 50% by weight, not only the effect can be obtained, but also the adhesiveness may be adversely affected.

FIG. 2 is a diagram showing a schematic process of a method of laminating an adhesive layer (3a) on one surface of a base material (2) in the thermal adhesive sheet (1a) according to the first embodiment of the present invention. is there.
The method for forming the adhesive layer (3a) on one surface of the substrate (2) is not particularly limited, and examples thereof include extrusion lamination as exemplified in FIG. Hereinafter, a method for forming the adhesive layer (3a) on one surface of the substrate (2) by extrusion lamination will be described.

A thermal adhesive resin having an MFR of 100 to 220 is supplied to the extruder (10). The molten resin melted in the extruder (10) is supplied to a T die (11) to form a film (a).
The substrate (2) is supplied from the feed roll (12) to the nip roll (13). The film (a) extruded from the T die (11) is supplied between the nip roll (13) and the cooling roll (14). The substrate (2) is passed between the nip roll (13) and the cooling roll (14) together with the film (a), whereby the film (a) is pressure bonded to one surface of the substrate (2). . Subsequently, it is cooled and solidified by a cooling roll (14). The heat-adhesive sheet (1a) in which the film (a) is pressure-bonded to one surface of the substrate (2) is wound around a winding roll (15).

Note that, depending on the MFR of the heat-adhesive resin, the laminating property may be deteriorated due to an increase in the fluidity of the molten resin.
As a method for improving the laminate processability, a method of blending waxes with the heat-adhesive resin as described above can be exemplified. By blending waxes with the heat-adhesive resin, the fluidity of the molten resin can be adjusted, and the laminate processability can be improved.
Moreover, the method of giving a non-adhesive coating (not shown) to the surface of a cooling roll (14) can be illustrated. Examples of the non-adhesive coating applied to the surface of the cooling roll (14) include a method of coating with a fluorine-based resin such as polytetrafluoroethylene and a method of spraying ceramics.
Further examples include a method of adjusting the processing temperature and a method of reducing the line speed (about 60 m / min).

Next, a thermal adhesive sheet according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 1 (B) is a partial cross-sectional view showing an outline of a thermal adhesive sheet according to the second embodiment of the present invention. The heat-adhesive sheet (1b) according to the second embodiment of the present invention comprises a sheet-like substrate (2) and an adhesive layer (3b) laminated on one surface of the sheet-like substrate (2). ).

In the heat-adhesive sheet (1b) according to the second embodiment, the adhesive layer (3b) contains a heat-adhesive resin having a viscosity of 1000 to 11000 Pa · s.
In the present invention, the viscosity is measured under a temperature condition of 180 ° C.
When the adhesive layer (3b) contains 1000 to 11000 Pa · s of heat-adhesive resin, the adhesive layer (3b) can be easily melted even by a heat source having a small heat capacity such as a non-steam iron or a cordless iron. The thermal adhesive sheet (1b) can be adhered to the surface of the adherend. And since the adhesive force with respect to the to-be-adhered body is high, when adhering to the to-be-adhered body surface, it can adhere to the to-be-adhered body surface, without applying big pressing force.
The viscosity of the thermal adhesive resin may be 1000 to 11000 Pa · s, preferably 3000 to 10000 Pa · s, and more preferably 5000 to 9000 Pa · s.

  Any thermoadhesive resin can be used as long as the thermoadhesive resin constituting the adhesive layer (3b) has a viscosity of 1000 to 11000 Pa · s. Specifically, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ionomer resin, a urethane resin, or a derivative thereof can be exemplified.

FIG.1 (C) is sectional drawing which shows the example of a change of the heat bondable sheet which concerns on 2nd embodiment of this invention.
In the modification of the heat-adhesive sheet (1b) according to the second embodiment, the adhesive layer (3b) is composed of a first adhesive layer (3b ₁ ) and a second adhesive layer (3b ₂ ). ing. The first adhesive layer (3b ₁ ) is laminated so as to be in contact with the substrate (2), and the second adhesive layer (3b ₂ ) is in contact with the first adhesive layer (3b ₁ ). Are stacked.

The first and second adhesive layers (3b ₁ , 3b ₂ ) contain 1000 to 11000 Pa · s of thermal adhesive resin, while the first adhesive layer (3b ₁ ) has a heat of 1000 to 11000 Pa · s. Among adhesive resins, a high-viscosity resin is contained, and the second adhesive layer (3b ₂ ) contains a low-viscosity resin among 1000 to 11000 Pa · s of thermal adhesive resins.
More specifically, the first adhesive layer (3b ₁ ) includes a high-viscosity thermal adhesive resin having a viscosity of 5000 to 11000 Pa · s, more preferably a viscosity of 7000 to 9000 Pa · s.
The second adhesive layer (3b ₂ ) contains a low-viscosity thermoadhesive resin having a viscosity of 1000 to 5000 Pa · s, more preferably 3000 to 5000 Pa · s.

In the heat-adhesive sheet (1b) according to the second embodiment, the adhesive layer (3b) is composed of two layers of the first adhesive layer (3b ₁ ) and the second adhesive layer (3b ₂ ). When the adherend has irregularities, first, the low-viscosity thermoadhesive resin enters the irregularities. Next, it can be more firmly fixed by a high viscosity thermal adhesive. Moreover, it can also prevent that the thermoadhesive resin which comprises an adhesive bond layer (3b) oozes out to a base material (2) or a to-be-adhered body surface.
That is, in the heat-adhesive sheet (1b) according to the second embodiment, as the viscosity of the heat-adhesive resin constituting the adhesive layer (3b) becomes lower, the melted adhesive when heat is supplied from an iron or the like. The agent is likely to soak into the substrate (2) or the adherend. In the place where the melted adhesive soaked into the base material (2) or the adherend, almost no adhesive is present on the surface of the base material (2). This caused a decrease in the adhesive strength with the body. In addition, wrinkles and scumming could cause beautiful finishes.
As in this modified example, the first adhesive layer (3b ₁ ) containing a high-viscosity thermoadhesive resin is formed on the substrate (2) side, thereby being laminated on the surface of the high-viscosity thermoadhesive resin. It is possible to prevent the low-viscosity thermoadhesive resin constituting the second adhesive layer (3b ₂ ) soaked into the base material (2). Further, even when the heat-adhesive resin constituting the second adhesive layer (3b ₂ ) soaks into the adherend, the high-viscosity first adhesive layer (3b ₁ ) becomes the base material (2 ) Since it exists on the surface, the adhesive force between the substrate (2) and the surface of the adherend is not reduced, and the generation of wrinkles and flaming can be prevented.

  In addition, in the thermoadhesive sheet (1b) according to the second embodiment, the sheet-like substrate (2) has the same configuration as the thermal adhesive sheet (1a) according to the first embodiment, Description is omitted.

3 and 4 show schematic steps of a method of laminating the adhesive layer (3b) on one surface of the substrate (2) in the heat-adhesive sheet (1b) according to the second embodiment of the present invention. FIG.
The method for forming the adhesive layer (3b) on one surface of the substrate (2) is not particularly limited, and examples thereof include roll coating as exemplified in FIG. 3 and FIG. Hereinafter, a method for forming the adhesive layer (3b) on one surface of the substrate (2) by roll coating will be described.

First, the process shown in FIG. 3 will be described. In the step shown in FIG. 3, a step of forming a single-layer adhesive layer (3b) on one surface of the substrate (2), that is, a manufacturing step of the thermal adhesive sheet (1b) shown in FIG. Indicates.
The adhesive tank (20) is filled with 1000 to 11000 Pa · s of heat-adhesive resin (b), and the heat-adhesive resin is supplied to the coating roll (21).
The substrate (2) is supplied from the feed roll (22) to the nip roll (23) and is passed between the nip roll (23) and the coating roll (21). At this time, the thermal adhesive resin (b) supplied from the adhesive tank (20) to the coating roll (21) is applied to one surface of the substrate (2).
The thermal adhesive resin (b) applied to one surface of the substrate (2) is cooled and solidified by the cooling roll (24). Thereby, the thermoadhesive sheet (1b) in which the adhesive layer (3b) is laminated on one surface of the substrate (2) is manufactured. The heat-adhesive sheet (1b) is taken up by a take-up roll (25).

Next, the process shown in FIG. 4 will be described. In the step shown in FIG. 4, the heat-adhesive sheet (1b) in which two adhesive layers (3b) are laminated on one surface of the substrate (2), that is, the heat-adhesive sheet shown in FIG. 1 (C). The manufacturing process of (1b) is shown.
In the first adhesive tank (30), a molten high-viscosity (7000 to 9000 Pa · s) heat-adhesive resin (b ₁ ) is placed, and the high-viscosity heat-adhesive resin (b ₁ ). Is fed to the first coating roll (31).
The substrate (2) is supplied from the feed roll (32) to the first nip roll (33) and is passed between the first nip roll (33) and the first coating roll (31). At this time, the high-viscosity thermoadhesive resin (b ₁ ) supplied from the first adhesive tank (30) to the first coating roll (31) is applied to one surface of the substrate (2). .
The thermoadhesive resin (b ₁ ) applied to one surface of the base material (2) is cooled and solidified by the cooling roll (34), and first the first surface is formed on the one surface of the base material (2). The adhesive layer (3b1) is laminated.

In the second adhesive tank (35), a melted low-viscosity (3000 to 5000 Pa · s) heat-adhesive resin (b ₂ ) is placed, and the low-viscosity heat-adhesive resin (b ₂ ). Is fed to the second coating roll (36).
The base material (2) having the first adhesive layer (3b ₁ ) laminated on one surface is supplied to the second nip roll (37), and the second nip roll (37) and the second coating roll ( 36). At this time, the low-viscosity thermal adhesive resin (b ₂ ) supplied from the second adhesive tank (35) to the second coating roll (36) is caused by the high-viscosity thermal adhesive resin (b ₁ ). It is applied over the first adhesive layer formed (3b _1).
The low-viscosity heat-adhesive resin (b ₂ ) applied to one surface of the substrate ( ₂ ) is cooled and solidified by the cooling roll (38). As a result, the thermal adhesiveness in which the adhesive layer (3b) composed of the first adhesive layer (3b ₁ ) and the second adhesive layer (3b ₂ ) is laminated on one surface of the substrate (2). A sheet (1b) is manufactured. The heat-adhesive sheet (1b) is wound on a winding roll (39).

  The heat-adhesive sheet (1) according to the present invention can be attached to the surface of an adherend by the same method as before, that is, by using a heat source such as an iron. As a heat source for an iron or the like used when sticking the heat-adhesive sheet (1) according to the present invention, a steam iron can be used as in the case of a conventional heat-adhesive sheet. It is possible to use an iron with a small heat capacity such as a cordless iron or a non-steam iron, which has been difficult to use with a sheet.

  Hereinafter, the present invention will be described in detail by showing examples. In addition, this invention is not limited at all by the following examples.

[Example 1]
By extrusion laminating, an adhesive layer in which the MFR of heat-adhesive resin (manufactured by Hirodine, “HD7554”) is adjusted to 150 is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.). Thus, the sample of Example 1 was prepared.

[Example 2]
An adhesive layer in which the MFR of the heat-adhesive resin (manufactured by Hirodyne, “HD7736”) is adjusted to 220 is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by extrusion lamination. Thus, the sample of Example 2 was prepared.

[Example 3]
An adhesive layer in which the MFR of the heat-adhesive resin (manufactured by Hirodine, “HD7554”) is adjusted to 106 is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by extrusion lamination. Thus, the sample of Example 3 was prepared.

[Example 4]
By extrusion laminating, the adhesive layer with MFR of heat-adhesive resin (manufactured by Tosoh Corporation, “Mersen MX24”) adjusted to 100 is laminated on the back of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) Thus, the sample of Example 4 was prepared.

[Example 5]
Bonding by adjusting the viscosity of the thermoadhesive resin (Toyomelt H655, manufactured by Toyo Petrolite Co., Ltd.) to 9050 Pa · s on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by roll coating. The sample of Example 5 was prepared by laminating the agent layer.

[Example 6]
Adhesion by adjusting the viscosity of a heat-adhesive resin (Toyomelt H655, manufactured by Toyo Petrolite Co., Ltd.) to 6780 Pa · s on the back surface of a base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by roll coating. A sample of Example 6 was prepared by laminating the agent layer.

[Example 7]
Adhesion by adjusting the viscosity of a heat-adhesive resin (Toyomelt H655, manufactured by Toyo Petrolite Co., Ltd.) to 5930 Pa · s on the back surface of the substrate (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by roll coating. The sample of Example 7 was prepared by laminating the agent layer.

[Example 8]
An adhesive layer in which the viscosity of the heat-adhesive resin (Hirodyne, “HD4605”) is adjusted to 4600 Pa · s on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by roll coating. A sample of Example 8 was prepared by laminating.

[Comparative Example 1]
By extrusion laminating, an adhesive layer in which the MFR of the heat-adhesive resin (manufactured by Hirodine, “HD7520”) is adjusted to 65 is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.). Thus, a sample of Comparative Example 1 was prepared.

[Comparative Example 2]
By extrusion laminating, an adhesive layer with a MFR of thermal adhesive resin (Mersen MX22, manufactured by Tosoh Corporation) adjusted to 90 is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) Thus, a sample of Comparative Example 2 was prepared.

[Comparative Example 3]
By extrusion laminating, the adhesive layer adjusted to 46 MFR of heat-adhesive resin (manufactured by Tosoh Corporation, “Mersen MX06”) is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) Thus, a sample of Comparative Example 3 was prepared.

[Comparative Example 4]
An adhesive layer in which the MFR of the heat-adhesive resin (manufactured by Hirodyne, “HD7554DB”) is adjusted to 22 is laminated on the back surface of the base material (basis weight 100 g / m ² manufactured by Nasu Paper Co., Ltd.) by extrusion lamination. Thus, a sample of Comparative Example 4 was prepared.

The physical property values of the substrates of the above Examples and Comparative Examples are as follows.
Material: Pulp, Hydrophobic shrinkable fiber Basis weight: 100 g / m ²
Thickness: 180-200 μm
Density: 0.57
Size: 50 seconds or less Air permeability: 10 seconds or less

[Test Example 1: Adhesive strength evaluation 1]
Samples of Examples 1 to 8 and Comparative Examples 1 to 4 were heat-sealed using a heat seal machine, heat seal temperature: 200 ° C., load: 0.8 × 10 ⁴ N / m ² , heat seal time: 1 second in Lauan veneer Sticked on the surface of. The adhesive force between each sample and Lauan veneer was evaluated. The results are listed in Tables 1 and 2.

  Evaluation of the occurrence of wrinkles and bursels revealed that many wrinkles and bursels were generated, and it was confirmed that the adhesive strength was around 5 N / 25 mm. From this, it was confirmed that the adhesive force is required to be at least 6 N / 25 mm or more, preferably 8 N / 25 mm or more. On the other hand, most of the adhesive strength of the comparative example was 6 N / 25 mm or less, and it was confirmed that the adhesive strength was extremely inferior.

[Test Example 2: Adhesion strength evaluation 2]
Samples of Examples 1 to 8 and Comparative Examples 1 to 4 were heat-sealed using a heat sealing machine, heat sealing temperature: 160 ° C., load: 0.8 × 10 ⁴ N / m ² , heat sealing time: 1 second in Lauan veneer Sticked on the surface of. The adhesive force between each sample and Lauan veneer was evaluated. The results are listed in Tables 3 and 4.

  In the sample of the example, even when the heat seal temperature was lowered, there was an adhesive strength of 7 N / 25 mm or more, and no significant reduction in the adhesive strength was confirmed.

[Test Example 3: Adhesive strength evaluation 3]
The samples of Examples 1 to 8 and Comparative Examples 1 to 4 were subjected to the same conditions (pressing force in each sample: 0.4 × 10 ⁴ N / m ² , heating time: 1 second, using a household iron. At a temperature of 200 ° C. and steam: none), the film was attached to the surface of Lauan veneer. The adhesive force between each sample and Lauan veneer was evaluated. The results are listed in Tables 5 and 6.

When the adhesive strength is 5 N / 25 mm or less, the adhesiveness is remarkably lowered. Therefore, at least, an adhesive strength of 6 N / 25 mm or more, preferably 8 N / 25 mm or more is required.
As shown in Table 1, the adhesive strengths of the samples of the examples were all 8 N / 25 mm or more, and it was confirmed that they had sufficient adhesive strength. On the other hand, the adhesive strengths of the comparative samples were all 5 N / 25 mm or less, and it was confirmed that the adhesive strength was extremely inferior.

[Test Example 4: Evaluation 1 of occurrence of wrinkles and flammets 1]
Each sample of Examples 1-8 and Comparative Examples 1-4 was stuck on the surface of Lauan veneer under the following conditions. Next, according to the following evaluation criteria, the state of occurrence of wrinkles and flamings of each sample adhered to the surface of the Lauan veneer was evaluated.
The results are listed in Tables 3 and 4.

<Ironing conditions>
Temperature: 200 ° C
Load: about 0.4 × 10 ⁴ N / m ²
Speed: About 10cm / sec Steam generation amount: About 8g / min

<Evaluation criteria>
◎ There is no wrinkle or flaming, and it is stuck in good condition.
〇 The total area of wrinkles and walnuts is 1/10 or less of the total area, and is adhered in a generally good state. △ The total area of wrinkles and flammets is 1/10 to 1/3. It is confirmed.
× The total area of wrinkles and scum is 1/3 or more, and many wrinkles and slabs are confirmed.

[Test Example 3: Evaluation 2 of the occurrence of wrinkles and flamings]
Each sample of Examples 1 to 8 and Comparative Examples 1 to 4 was attached to the surface of Lauan veneer under exactly the same conditions as Test Example 2 except that steam was not generated. The state of occurrence of wrinkles and walnuts in each sample was evaluated according to the same evaluation criteria as in Test Example 2. The results are listed in Tables 7 and 8.

As shown in Table 7, in the sample of the example, there is no generation of wrinkles and flaming, or even when wrinkles and flaming are generated, the generation amount is small, even when using a household iron, It was confirmed that it can be applied beautifully. Even when steam was not used, it was confirmed that it could be applied beautifully as with steam.
On the other hand, as shown in Table 8, in the sample of the comparative example, the generation amount of wrinkles and scum was large, and it was not possible to stick beautifully.

  The heat-adhesive sheet according to the present invention is suitably used as paper, paper, or wallpaper that is attached to the surface of an object to be attached such as paper, paper, or a wall by using a heat source such as an iron. be able to.

(A) is a fragmentary sectional view which shows the outline of the thermoadhesive sheet which concerns on 1st embodiment, (B) is a fragmentary sectional view which shows the outline of the thermoadhesive sheet which concerns on 2nd embodiment, (C ) Is a partial cross-sectional view showing an outline of a modified example of the thermal adhesive sheet according to the second embodiment. In the heat bondable sheet which concerns on 1st embodiment, it is the figure which showed the schematic process of the method of laminating | stacking an adhesive bond layer on one side of a base material. In the heat bondable sheet which concerns on 2nd embodiment, it is the figure which showed the schematic process of the method of laminating | stacking an adhesive bond layer on one side of a base material. In the heat bondable sheet which concerns on 2nd embodiment, it is the figure which showed the schematic process of the method of laminating | stacking an adhesive bond layer on one side of a base material.

Explanation of symbols

1a Thermal adhesive sheet 1b according to the first embodiment Thermal adhesive sheet 2 according to the second embodiment Base material 3a Adhesive layer 3b Adhesive layer 3b ₁ First adhesive layer 3b ₂ Second adhesive layer 10 Extruder 11 T-die 12 Feed roll 13 Nip roll 14 Cooling roll 15 Take-up roll 20 Adhesive tank 21 Coating roll 22 Feed roll 23 Nip roll 24 Cooling roll 25 Take-up roll 30 First adhesive tank 31 First coating roll 32 Feed roll 33 First nip roll 34 Cooling roll 35 Second adhesive tank 36 Second coating roll 37 Second nip roll 38 Cooling roll 39 Winding roll a Film b Thermal adhesive resin b ₁ High viscosity thermal adhesiveness Resin b ₂ low viscosity thermal adhesive resin

Claims (6)

It consists of a sheet-like base material and an adhesive layer laminated on one surface of the sheet-like base material, and the adhesive layer is made of a heat-adhesive resin having an MFR (melt flow rate) of 100 to 220. A heat-adhesive sheet comprising: It consists of a sheet-like base material and an adhesive layer laminated on one surface of the sheet-like base material,
The adhesive layer contains a thermoadhesive resin having a viscosity of 1000 to 11000 Pa · s. It consists of a sheet-like base material and an adhesive layer laminated on one surface of the sheet-like base material,
The adhesive layer includes a first adhesive layer laminated so as to be in contact with one surface of the sheet-like substrate, and a second adhesive laminated so as to be in contact with the first adhesive layer. Consists of layers,
The first adhesive layer includes a thermoadhesive resin having a viscosity of 5000 to 11000 Pa · s, and the second adhesive layer includes a thermoadhesive resin having a viscosity of 1000 to 5000 Pa · s. Thermal adhesive sheet. The thermal adhesive sheet according to any one of claims 1 to 3, wherein the sheet-like base material contains pulp. The thermal adhesive sheet according to any one of claims 1 to 4, wherein the sheet-like base material includes hydrophobic shrinkable fibers. The heat-adhesive sheet according to any one of claims 1 to 5, wherein the sheet-like base material is provided with irregularities by creping or embossing.

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