JP2000273424A - Air-permeable tacky adhesive sheet and air-permeable laminate sheet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air-permeable tacky adhesive sheet capable of readily providing an air-permeable laminate sheet by hot contact bonding. SOLUTION: A feed roll 2 wound with an air-permeable substrate sheet and a winding roll 3 for winding a nonwoven fabric 1 drawn out from the feed roll 2 are installed. A spray apparatus 4 is arranged above the nonwoven fabric 1 extending between both the rolls 2 and 3. A drying zone 5 is laid on the downstream side of the spray apparatus 4. The nonwoven fabric 1 is traveled from the feed roll 2 side to the winding roll 3 side at a fixed velocity and a fixed amount per unit time of a tacky adhesive solution (or emulsion) or a mixture (tacky adhesive 6) of the tacky agent solution (or emulsion), and an adhesive is sprayed on the nonwoven fabric, from the spray apparatus 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas-permeable adhesive sheet, a gas-permeable laminated sheet using the same, and a method for producing a gas-permeable adhesive sheet.

[0002]

2. Description of the Related Art Conventionally, in the case of producing a breathable laminated sheet by laminating a breathable sheet such as a nonwoven fabric, a method of directly laminating nonwoven fabrics by thermocompression bonding utilizing the heat-fusibility of the nonwoven fabric itself has been used. is there. However, such a method has been difficult to apply to non-self-fusing materials such as paper and cloth.

As another method, there is a method in which a solid hot-melt adhesive powder is scattered between air-permeable sheets, and this is thermally pressed to obtain a gas-permeable laminated sheet.

However, in these methods,
It was extremely difficult to laminate another object at a fixed position between the breathable sheets. This is because the object to be sandwiched is displaced during thermocompression bonding.

Therefore, an adhesive is sprayed on the air-permeable base sheet, an object to be pressed is held at a desired position on the spray surface, and a similar or different air-permeable sheet is thermocompressed thereon. The method of laminating was also attempted, but because the base sheet was breathable, the dispersed adhesive oozed out to the outer surface of the laminated sheet, and caused problems such as generating tack on the laminated sheet surface. .

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a breathable adhesive sheet which can easily obtain a breathable laminate sheet by thermocompression bonding. Another object is to provide a breathable pressure-sensitive adhesive sheet which does not cause tack on the surface of the laminate sheet due to oozing of an adhesive or the like even when laminated by thermocompression bonding. It is a further object of the present invention to provide a breathable laminate sheet having no tackiness on the surface where another object is sandwiched at a desired position. It is a further object of the present invention to provide a method for producing a breathable adhesive sheet.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method for forming a base material having air permeability on a surface thereof.
Disclosed is a breathable pressure-sensitive adhesive sheet characterized by forming a pressure-sensitive adhesive layer capable of maintaining air permeability and adhering and holding another object. That is, the adhesive layer is formed on the surface of the base sheet without impairing the air permeability of the base sheet.

[0008] The substrate sheet is preferably paper, woven or non-woven fabric, but is not limited thereto, and any suitable substrate sheet having air permeability can be used.

The adhesive layer is formed on only one side of the base sheet, but may be formed on both sides if necessary.

Although the base sheet of the gas-permeable adhesive sheet of the present invention has been described above as being air-permeable, it has a pressure-sensitive adhesive layer formed on its surface, In order to obtain a viscous adhesive sheet, it is necessary that the adhesive layer formed on the substrate also has air permeability. In order to form such a pressure-sensitive adhesive layer, a method of spraying a pressure-sensitive adhesive on the surface of the base sheet to form a layer in which fine particles of the pressure-sensitive adhesive are applied in a simple manner is simplified. Can be adopted. In addition, as another method, a method of halftone printing an adhesive on the base sheet to form a layer in which adhesive particles are applied dotwise is also employed.

The adhesive used in the present invention is:
It is a viscous solid that is sticky at room temperature, and once heated and pressed, changes into an adhesive that is harder at room temperature and shows little tackiness. An example thereof is an acrylic ester-based crosslinkable polymer that exhibits tackiness at room temperature and that is heated to accelerate the crosslinking reaction to be cured to form an adhesive.

In addition, a simple mixture of a polyacrylate pressure-sensitive adhesive at normal temperature and a fine powder of a hot-melt adhesive can be usefully used as a pressure-sensitive adhesive.

When the same or different kinds of breathable sheets are stacked on the adhesive layer surface of the breathable adhesive sheet of the present invention and thermocompression-bonded, a breathable laminate sheet is obtained, and the obtained laminate sheet is obtained. No viscosity or tackiness is observed on the surface.

When performing such a heat laminating operation, a desired object, for example, a fine granule of activated carbon, is adhered to a desired position on the adhesive layer surface of the breathable adhesive sheet in advance. If this is done, a breathable laminate sheet having activated carbon fine granules interposed therebetween can be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a supply roll 2 around which a non-woven fabric 1 having air permeability is wound, and a winding roll 3 for winding up the non-woven fabric 1 drawn from the supply roll 2 are provided. . Further, a spray device 4 is arranged above the nonwoven fabric 1 extending between the two rolls 2 and 3, and a drying zone 5 is provided downstream of the spray device 4.

Then, from the supply roll 2 side, the winding roll 3
The nonwoven fabric 1 is caused to travel at a constant speed on the side, and a fixed amount of an adhesive solution (or an emulsion) or a mixture of an adhesive solution (or an emulsion) and an adhesive (hereinafter referred to as an adhesive) from the spray device 4 per unit time. 6). This adhesive 6
In the present embodiment, a CAT-1300S adhesive manufactured by Teikoku Ink Mfg. Co., Ltd., which is an acrylic resin-based pressure-sensitive adhesive, is added to a copolyamide resin-based heat-sensitive adhesive having a particle diameter of 80 μm or less. Is added 25% (weight ratio) and stirred well.
Further, the viscosity was adjusted by adding 20% (by weight) of xylol to give a sprayable viscosity.

The relationship between the running speed of the nonwoven fabric 1 and the spray amount of the adhesive 6 per unit time is based on the adhesive layer capable of maintaining the air permeability of the substrate 1 and adhering objects. It is adjusted in advance so as to be formed on the surface of the material 1. Therefore, after the adhesive 6 is sprayed by the spray device 4 and then dried in the drying area 5, the adhesive 6 is dried on one side of the nonwoven fabric 1 as shown in FIG. The adhesive sheet 8 on which the adhesive layer 7 is present is produced, and the adhesive sheet 8 is wound up by the winding roll 3 (at this time, the adhesive force is strong). In that case, release paper is interposed).

In this embodiment, the adhesive 6 is spray-coated by the spray device 4, but it may be printed by halftone printing.

Next, as shown in FIG. 3, the air-permeable adhesive sheet 8 wound around the roll 3 was re-wound so that the adhesive layer was on the upper surface. And activated carbon granule feeder 9
The activated carbon granules 10 were adhered and held at predetermined positions by using (at this time, there was no scattering of the granules). Further, it was covered with a non-woven fabric 1 rewinded from a roll 2 and thermocompression-bonded by a roll 11. When the activated carbon granules were sandwiched, the laminate sheet 13 was strongly adhered and maintained sufficient air permeability. No tackiness was felt on the surface.

The sheet 13 thus produced could be used as a deodorizing sheet.

In this embodiment, as described above, the air-permeable adhesive sheet 8 having the activated carbon granules 10 adhered and held at predetermined positions is covered with the nonwoven fabric 1 and thermocompression-bonded by the rolls 11 and 12. Activated carbon granules 10
May be further covered with the air-permeable adhesive sheet 8 holding the adhesive, and the adhesive layers 7 of both air-permeable adhesive sheets 8 may be thermocompression bonded. Also,
Breathable adhesive sheet 8 holding activated carbon granules 10
A permeable sheet made of paper, woven fabric or the like other than the nonwoven fabric 1 may be thermocompression-bonded thereon.

[0023]

As described above, according to the present invention, a breathable laminated sheet can be easily obtained even if a breathable sheet having no self-heat-fusing property is used, and a fixed position between the breathable sheets can be obtained. Can easily be laminated with other objects interposed therebetween. Furthermore, even if lamination is performed by thermocompression bonding, a breathable pressure-sensitive adhesive sheet can be obtained that does not generate tack on the surface of the laminate sheet due to oozing of an adhesive or the like.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating a manufacturing process according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of an adhesive sheet.

FIG. 3 is a conceptual diagram of a manufacturing process following FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nonwoven fabric 4 Spray device 7 Adhesive layer 8 Adhesive sheet

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4F100 AK25B AK46B AR00A BA02 BA08 BA33 CA16B DE01B DG10A DG12A DG15A EA02 EH61 JD02 JD02A JL13B 4J004 AA02 AA10 AB01 AB03 AB05 CA02 CB01 CB02 CC02 FA08 GA01

Claims (8)

[Claims] 1. A gas-permeable adhesive sheet comprising a gas-permeable adhesive sheet formed on a surface of a gas-permeable base sheet, the adhesive layer being capable of maintaining air permeability and adhering and holding other objects. . 2. The air-permeable adhesive sheet according to claim 1, wherein the air-permeable base sheet is any one of paper, woven fabric and non-woven fabric. 3. The air-permeable adhesive sheet according to claim 1, wherein the adhesive is a mixture of an adhesive and an adhesive. 4. The breathable pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive layer is formed on only one surface of the air-permeable base sheet. 5. A breathable laminate sheet obtained by thermally bonding the same or different kinds of breathable sheets on the adhesive layer of the breathable adhesive sheet according to claim 4. 6. An air-permeable adhesive sheet according to claim 4, wherein another object is adhered and held at a desired position on the adhesive of the air-permeable adhesive sheet, and further, the same or different air-permeable sheet is thermally bonded thereon. A breathable laminate sheet sandwiching other objects. 7. The method according to claim 1, wherein the surface of the air-permeable base sheet is spray-coated with a thermal adhesive.
5. The method for producing a breathable pressure-sensitive adhesive sheet according to any one of items 1 to 4. 8. The method for producing a breathable pressure-sensitive adhesive sheet according to claim 1, wherein an adhesive is halftone-printed on the surface of the breathable substrate sheet.