JPH08299378A - Adhesive type disposable body warmer - Google Patents

Abstract

PURPOSE: To provide a body warmer having a sealed configuration such that the thickness of the peripheral wall of the body warmer can be decreased, having excellent adhesion and fixation to an underwear or the like, and excellent in manufacturing efficiency. CONSTITUTION: An adhesive disposable body warmer is composed of a bag in which a base material sheet surface of an adhesive sheet 3 consisting of a base material sheet 31 and an adhesive layer 32 at one surface of the base material sheet 31, an air-permeable base material 1 are heat-sealed 4 at their peripheral edge parts each having an adhesive layer in such a condition that an air-permeable heat generating compound 2 is stored therein, and the heat- sealed part in the peripheral edge part is formed, in its entirety or in part, inward from the peripheral end of the bag, and accordingly, the peripheral end of the bag is in its entirety or in part in a free condition 6. With this arrangement, the end parts of the body warmer are firmly stuck and fixed so as to avoid peeling off from its one end, and so forth, thereby it is possible to prevent an wear or the like from being damaged during peel-off, caused by a high strength adhesive. Further, the body warmer can be efficiently formed by a heat sealing manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive-type disposable body warmer which can be used by being adhesively fixed to clothes such as underwear and which is excellent in the adhesive fixation.

[0002]

2. Description of the Related Art Conventionally, from a bag body in which a breathable base material and an adhesive sheet are heat-sealed and sealed while a breathable exothermic composition containing metal powder, water, a water retention agent, an oxidation accelerator, etc. is housed inside. An adhesive-type disposable body warmer was proposed. This body warmer is intended to be bonded to underwear or the like via the pressure sensitive adhesive sheet so that a desired portion can be warmed, and it has been proposed to provide a pressure sensitive adhesive layer in a stripe shape in order to facilitate the bonding operation.

However, there is a problem in that the adhesive fixability to underwear or the like is poor. That is, when adhered to underwear or the like via the surface of the pressure-sensitive adhesive sheet, there is a problem in that the end portion around the body warmer is likely to be peeled off and the body warmer is likely to drop during daily life. It is thought that one reason is that the periphery of the body warmer is a thin portion where the ventilating heat-generating composition is not located, but such thinning is unavoidable because it is a form of enclosing the thick contents in the bag.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to obtain an adhesive-type disposable body warmer that is excellent in adhesive fixing property to underwear and is excellent in manufacturing efficiency in an enclosed form in which the body portion around the body warmer is thin. .

[0005]

According to the present invention, an adhesive sheet having an adhesive layer on one surface of a substrate sheet and a breathable substrate are adhered to each other in a state where a breathable heat-generating composition is contained inside. Consisting of a bag heat-sealed at the periphery with layers,
Provided is an adhesive-type disposable body warmer, characterized in that all or part of the heat-sealing part in the peripheral part is formed inside the peripheral end of the bag body and all or part of the peripheral end part is in a free state. To do.

[0006]

With the above-mentioned configuration in which the heat seal portion is formed inside the peripheral edge of the bag body and the peripheral edge portion having the adhesive layer is in a free state, it can be used as underwear even in the sealed form in which the periphery of the body warmer becomes thin. A body warmer that can be firmly bonded and fixed and that does not easily fall off due to peeling from the end or the like can be efficiently manufactured by the heat sealing method. From the above results, the present inventors have found that the adhesive layer is affected by the heat-sealing treatment and the adhesive strength is reduced. In the conventional product, the heat-sealing portion occupies the entire circumference of the body warmer. It is believed that this caused a synergistic effect with peeling and dropping from the end.

[0007]

EXAMPLE An adhesive-type disposable body warmer according to the present invention has a base sheet surface of a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on one side of the base sheet, and a breathable base material in which the breathable heat-generating composition is housed. It consists of a bag with a peripheral edge having an adhesive layer that is heat-sealed, and all or part of the heat-sealed portion at the peripheral edge is formed inside the peripheral edge of the bag, and all or part of the peripheral edge is free. It is in a state. An example thereof is shown in FIG. Reference numeral 1 is a breathable base material, 2 is a heat generating composition for ventilation, 3 is an adhesive sheet, 31 is the base sheet, 32 is the adhesive layer, and 33 is the separator. Further, 4 is a heat seal portion, and 6 is a peripheral end portion in a free state. 34
Is the part without the adhesive layer arranged in the center of the body warmer.

In the adhesive-type disposable body warmer of the present invention, all or part of the heat-sealed portion is formed inside the peripheral edge of the bag body, and all or part of the peripheral edge portion is in a free state. Except for this, it can be formed according to the conventional method.

Therefore, as the breathable substrate, for example, a breathable plastic film made porous by an appropriate method such as a stretching treatment or a perforating treatment and a breathable sheet such as a nonwoven fabric are laminated with a nonwoven fabric-like porous adhesive layer interposed therebetween. There can be used the conventional products such as those mentioned above, and there is no particular limitation. Typical thickness of the breathable substrate is 100-300 μm, but is not limited thereto.

As for the aeration exothermic composition, a suitable composition comprising metal powder such as iron, water, a water retention agent such as salts and activated carbon, an oxidation accelerator, etc., which generates heat upon contact with oxygen in the air, is used. Can be used. The amount of the exothermic composition for ventilation is appropriately determined depending on the maximum exothermic temperature and the time for which the temperature should be maintained.

Further, as the pressure-sensitive adhesive sheet, an appropriate one having a pressure-sensitive adhesive layer on one surface of the base material sheet can be used according to the conventional method. Incidentally, as the substrate sheet, a plastic film or a laminate of a plastic film and a non-woven fabric or a woven fabric is generally used. The base sheet may or may not have air permeability.

The base sheet which can be preferably used is composed of a film having a good heat-sealing property on the adhesive surface to the air-permeable base material for forming a bag, and the back surface is composed of an adhesive layer and a film having a good adhesive property. It is a thing. Examples thereof include those obtained by laminating 2 to 5 layers of a film made of an appropriate polymer such as polyethylene with a film having a good heat-sealing property such as ethylene / vinyl acetate copolymer on the adhesive surface, or heat-sealing a non-woven fabric. Examples include those laminated with a film having good properties.

The above-mentioned base sheet is formed into a composite sheet by a laminating method or a laminating method, in addition to achieving the heat sealing property on the front and back surfaces and the adhesive property with the adhesive layer, the heat resistance of the entire sheet and the mechanical property. It is also advantageous for imparting desired performance such as imparting desired strength. The ventilation exothermic composition forming the body warmer is a colored material such as black, and therefore, from the viewpoint of shielding, a concealing base material sheet is formed by an appropriate method such as an increase in the sheet thickness or the addition of a colorant. It is desirable to do.

The pressure-sensitive adhesive layer provided on one surface of the base sheet is for fixing the body warmer to the clothing such as underwear. The adhesive layer is a body warmer (bag) that includes the heat seal part.
50% or more, especially 60% or more, especially 70% or more of the peripheral length of the. Generally, an adhesive layer is provided on the entire surface of the base sheet in the body warmer, or almost the entire surface except the central portion. The adhesive layer may be set to have a partially different adhesive force, but is generally in a substantially uniform adhesive state with a constant thickness.

The thickness of the pressure-sensitive adhesive layer is appropriately determined according to the type of the pressure-sensitive adhesive, the set adhesive force, the desired adhesive fixing property of the body warmer, and the like. Generally less than 500 μm, especially 3
The thickness is 00 μm or less, particularly 1 to 200 μm. Also, the set adhesive force is 50 to 2000 gf / 20 mm based on the adhesive force (180 degree peeling) to the stainless steel plate, especially 100 to
1500gf / 20mm, especially 150-1200gf / 20mm
However, it can be appropriately determined depending on the size of the body warmer, the adherend, and the like. Note that the pressure-sensitive adhesive sheet generally has a thickness of 10 to 800 μm, but is not limited thereto.

The body warmer is usually in a state in which the adhesive layer is covered with a separator until it is put to practical use. The separator is not particularly limited, and an appropriate separator may be used. Examples thereof include those obtained by subjecting thin leaves made of a general-purpose plastic such as polyester to a film or polyethylene laminated paper to a surface treatment with an appropriate release agent such as a silicone type or a long chain alkyl type. The thickness of the separator is usually about 20 to 200 μm, and the separator may be printed according to the usage method or the like, if necessary.

A pressure-sensitive adhesive sheet that can be preferably used for forming a body warmer is one in which a large number of pressure-sensitive adhesive sheet units for forming a body warmer are formed on a base sheet. According to this, the adhesive-type disposable body warmer of the present invention can be continuously and efficiently manufactured using a long air-permeable substrate.

That is, according to the above, for example, a predetermined amount of the ventilation exothermic composition is distributed on the surface of the base material sheet of a long pressure-sensitive adhesive sheet so as to correspond to the unit for forming a body warmer, and the air permeability is further provided thereon. A base material is arranged, and the base material sheet surface and the air-permeable base material are heat-sealed in sequence to continuously form a bag body in which the air-permeable heat-generating composition is enclosed. The body warmer can be efficiently obtained by a method such as cutting by an appropriate method.

FIG. 2 and FIG. 3 exemplify a long adhesive sheet in which a large number of adhesive sheet units for forming a body warmer are formed on a base material sheet. In the example illustrated in FIG. 2, the adhesive layer 32 is arranged in a stripe shape in one direction with a predetermined gap 34 provided. In the example illustrated in FIG. 3, the adhesive layer 32 is arranged in a stripe shape in both vertical and horizontal directions. It was done.

According to the adhesive sheet illustrated in FIGS. 2 and 3,
The heat seal portion is provided in the state shown by reference numeral 4, and is cut in the state shown by the virtual line of reference numeral 5 to form the desired body warmer. Therefore, as shown in FIG. 2, when the adhesive layer is arranged in a stripe shape in one direction, the peripheral end portions 6 in a free state are formed on the two opposite sides of the rectangular body warmer. Further, as shown in FIG. 3, when the adhesive layers are arranged in stripes in both vertical and horizontal directions, the peripheral end portion 6 in a free state is formed on all four sides of the square body warmer. According to the present invention, even a body warmer having a free peripheral edge portion formed on two opposing sides as shown in FIG. 2 can be excellent in adhesive fixing property.

In the above description, the gap 34 between the adhesive layers
Is provided as necessary for the purpose of facilitating the peeling of the separator 33, and the width thereof is usually 5
It is set to 0 mm or less, preferably 40 mm or less, and particularly about 5 to 30 mm. Providing a notch or the like in the separator portion in such a gap makes it easier to peel the separator. Such a separator remains temporarily attached until it is put to practical use for bonding and fixing the body warmer, and the formed body warmer is enclosed in an outer bag and shielded from the outside air until it is put to practical use so that the exothermic reaction does not proceed. Will be dealt with.

The arrangement of the pressure-sensitive adhesive layer in the long pressure-sensitive adhesive sheet is appropriately determined according to the size of the body warmer to be formed, and as described above, the pressure-sensitive adhesive layer is positioned at least 50% or more of the peripheral length of the body warmer to be formed. It is arranged so that it will be done. Therefore, at least the adhesive layer is provided on the whole or a part of the peripheral portion of the body warmer including the heat seal portion. The preferred width of the adhesive layer in the body warmer is 1/10 or more, preferably 1/5 or more, and particularly 1/3 or more.

The pressure-sensitive adhesive layer is formed by an appropriate method such as a method of directly attaching the pressure-sensitive adhesive on the base material sheet or a method of attaching it on the separator and adhering it to the base material sheet for transfer. be able to. The attachment of the adhesive layer can also be performed using an appropriate coating machine such as a gravure method or a screen printing method. An appropriate adhesive such as acrylic or rubber can be used as the adhesive. It is not preferable that the adhesive body is strong enough to damage clothes or the like when the adhesively fixed body warmer is peeled off.

EXAMPLE 1 A polyethylene film in a laminate of a polyethylene film having a thickness of 50 μm and an ethylene / vinyl acetate copolymer film having a thickness of 30 μm was striped on the polyethylene surface according to FIG. 2 and comprising an acrylic adhesive layer having a thickness of 25 μm. The pressure-sensitive adhesive layer was attached at a predetermined interval, and a paper separator treated with a silicone-based release agent was bonded onto the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive sheet. The adhesive strength of the adhesive layer to the stainless steel plate (180 degree peel,
The same applies hereinafter) was 400 gf / 20 mm.

Next, on the surface of the ethylene / vinyl acetate copolymer in the above-mentioned pressure-sensitive adhesive sheet, a predetermined amount of the breathable heat-generating composition corresponding to the desired body-forming unit was sequentially distributed, and uniaxially stretched thereon. After arranging a breathable substrate composed of a laminate of a polyethylene-based porous film and a polyamide-based non-woven fabric through the porous film surface by heat-sealing the pressure-sensitive adhesive layer portion of the pressure-sensitive adhesive sheet, and also in a direction orthogonal thereto. A heat-sealing treatment is performed at a predetermined interval to enclose the ventilation exothermic composition in a bag made of an adhesive sheet and an air-permeable base material, and cut the outside of the heat-sealing line in the stripe direction on the adhesive layer. As a result, the intended adhesive-type disposable body warmers, in which the two sides of the peripheral edge are free, were successively formed. The adhesive strength (180 degree peel) between the pressure-sensitive adhesive sheet and the breathable base material at the heat-sealing portion is 300 gf.
It was / 20 mm.

Example 2 According to FIG. 3, a pressure-sensitive adhesive sheet provided with striped pressure-sensitive adhesive layers in both vertical and horizontal directions was used, and the outer side of any heat-sealing line was cut so that four sides of the peripheral edge were free. A body warmer was obtained in the same manner as in Example 1 except for the presence.

Comparative Example 1 A body warmer was obtained in the same manner as in Example 1 except that it was cut along the heat-sealing line so that it did not have a free portion at the peripheral edge.

Comparative Example 2 Using a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer having a thickness of 30 μm, a body warmer was obtained according to Comparative Example 1. The adhesive strength of the adhesive layer to the stainless steel plate was 500 gf / 20 mm. The adhesive strength (180 degree peel) between the pressure-sensitive adhesive sheet and the air-permeable base material at the heat-sealed portion was 400 gf / 20 mm.

Evaluation Test Twenty pieces were randomly extracted from the adhesive-type disposable body warmers obtained in the Examples and Comparative Examples, and the samples were combined with each Example and each Comparative Example based on trial fitting by 20 people's monitors. The adhesive fixability, the presence or absence of peeling during use, the residual adhesive strength after use, and the degree of pain of clothing after peeling the body warmer were examined, and a comprehensive evaluation was performed based on them. The results are shown in Tables 1 and 2.

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

According to the present invention, even when the body part of the body warmer is thinly sealed, the end portion of the body warmer can be firmly adhered and firmly fixed to the underwear or the like, and the drop problem due to peeling from the end portion or the like can be caused. It is possible to avoid the above, and also to prevent the clothing or the like from being damaged by strong adhesion to the clothing or the like at the time of peeling. In addition, a heat-sealing method can efficiently obtain an adhesive-type disposable body warmer having excellent adhesive fixability.

[Brief description of drawings]

FIG. 1 is a sectional view of an example.

FIG. 2 is an explanatory view of an example of a pattern of an adhesive layer in a long adhesive sheet.

FIG. 3 is an explanatory view of another pattern example of an adhesive layer in a long adhesive sheet.

[Explanation of symbols]

1: Breathable base material 2: Breathing heat-generating composition 3: Adhesive sheet 31: Base material sheet 32: Adhesive layer 33: Separator 4: Heat seal part 5: Cutting line to the Cairo unit 6: Peripheral end part in free state

Claims (2)

[Claims] 1. A base sheet having a pressure-sensitive adhesive layer on one side of a base sheet and a breathable substrate, and a peripheral portion having the pressure-sensitive adhesive layer in a state in which a breathable heat-generating composition is housed inside is heat-sealed. An adhesive characterized in that all or part of the heat-sealing portion at the peripheral portion of the bag body is formed inside the peripheral edge of the bag body, and all or part of the peripheral edge portion is in a free state. Type throwaway Cairo. 2. The adhesive type disposable body warmer according to claim 1, wherein the adhesive layer has a substantially constant thickness over the entire surface except the central portion, and the adhesive layer is covered with a separator.