JPH0898856A - Tacky adhesive working and packaging material for body warmer - Google Patents

Abstract

PURPOSE: To develop a packaging material on a tacky adhesive side for efficient production of body warmers which entirely prevent powder spilling, etc., by imparting a soft and excellent wearing feeling to the body warmers with tacky adhesives usable by sticking the body warmers to an object to be warmed, such as human body, and assuring fail-proof thermal adhesion in spite of the presence of differences in level by presence or absence of a tacky adhesive layer in the peripheral part. CONSTITUTION: One surface of a composite sheet formed by superposing and fixing plastic films 2, 3 to both surfaces of a non-woven fabric 1 having elasticity and softness is used as a thermal adhesive surface to the air permeable side packaging material and the other one surface as a surface to be provided with a tacky adhesive layer 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive-processed packaging material for a body warmer, and more particularly to a pressure-sensitive adhesive layer-side packaging material of a packaging material forming a flat bag of a body warmer. The present invention relates to a pressure-sensitive adhesive-processed packaging material for a body warmer, which can be attached to the location, has a soft feel, and has an excellent sealing property with no powder spill.

[0002] In recent years, as one of the means for collecting heat, a body warmer having metal powder such as iron or aluminum as a main component and containing a heat-generating composition which generates heat upon contact with air in a flat bag having air permeability has become popular. Widely used. Further, as one of the usage forms of these body warmers, a body having a pressure-sensitive adhesive layer provided on one surface of the body warmer so that it can be used by being attached to a desired site such as a human body, has begun to be marketed, and its demand is also expanding.

[0003]

2. Description of the Related Art A pressure-sensitive adhesive layer is usually provided on the surface opposite to the air-permeable side of a body warmer, and is known to have a pressure-sensitive adhesive applied or a double-sided pressure-sensitive adhesive sheet or tape attached. Has been. The pressure-sensitive adhesive layer is provided on all or part of one side of the bag, and the pressure-sensitive adhesive layer is covered with a release paper to form a body warmer that can be attached to an object to be kept warm, such as the human body. It is sealed and stored in and stored until use.

However, when the pressure-sensitive adhesive layer is provided over the entire surface, the entire surface of the release paper superposed on the pressure-sensitive adhesive layer adheres to the pressure-sensitive adhesive layer, making it difficult to peel it off during use. As an example, the left and right sides of the surface are coated with a predetermined width, leaving an uncoated part at the front and rear edges and the central part, and the release paper is laid over the entire surface. It is known that a release paper can be peeled off by inserting a finger or the like between the uncoated part and the uncoated part (Japanese Utility Model Laid-Open No. 01-81023).

[0005]

However, the release paper can be easily removed by partially providing an uncoated portion of the pressure-sensitive adhesive layer, including the peripheral portion of the pressure-sensitive adhesive layer surface. When overlapping with the packaging material and heat-bonding each other at the peripheral parts to form a bag for the body warmer, the heat-bonding becomes uneven because the sealing pressure applied to the heat-bonding surface becomes uneven due to the step due to the presence or absence of the adhesive layer. There was a problem that it became incomplete and the seal part peeled off to cause powder spillage.

[0006]

The present inventors have dealt with these problems, and the release paper can be easily removed at the time of use, and moreover, heat sealing is surely performed and there is no fear of spilling powder or the like. As a result of continuing intensive research to obtain a packaging material for body warmers, which can efficiently manufacture a body warmer with an agent, by using a composite sheet in which a nonwoven fabric is sandwiched between two plastic films as a packaging material, The inventors have found that the object can be achieved, and have reached the present invention. That is, the present invention is a pressure-sensitive adhesive-processed packaging material for a body warmer, in which a plastic film is laminated on both surfaces of a nonwoven fabric having elasticity and flexibility and fixed to each other, and one surface is a heat-bonding surface and the other surface is a pressure-sensitive adhesive layer surface. It is a pressure-sensitive adhesive processed packaging material for body warmers, which is characterized by

The adhesive-processed packaging material for the body warmer of the present invention (hereinafter,
Adhesive side packaging material) is a packaging material on one side of the bag of the body warmer, that is, the adhesive layer side, and the other packaging material having air permeability (hereinafter referred to as the ventilation side packaging material). Overlay
The surroundings are heat-bonded to each other to form a bag for body warmers.
By storing an exothermic composition containing iron powder or the like as a main component and generating heat upon contact with air inside the bag, a body warmer with an adhesive is formed.

[0008] The adhesive side packaging material of the present invention is basically a non-woven fabric having plastic films laminated on both sides and fixed, and one side is inside the bag for the body warmer, that is, the breathable side packaging material and the periphery thereof. It becomes a heat-bonded surface for sealing with
The other side is the outside of the bag, that is, the adhesive layer side.

In the present invention, as long as the non-woven fabric has elasticity and flexibility (cushioning property), its material is not particularly limited. For example, nylon, polyester,
Non-woven fabrics of synthetic and natural fibers such as polyethylene, polypropylene, polyacrylic, polyvinyl chloride, pulp, cotton, wool and rayon, and paper. Of these, nylon, polyester, polyethylene, polypropylene, pulp, rayon and blended products of these are generally preferable because they have excellent cushioning properties and soft feel. The dimensions, thickness, weight and the like of the non-woven fabric are appropriately selected from commercially available products, but usually, the basis weight is 10 to 50 m ² / g and the thickness is about 20 to 1000 μm.

The material of the plastic film laminated on both sides of the non-woven fabric is not particularly limited.
Examples thereof include polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, vinylidene chloride, and composite films thereof. The thickness of the plastic film is determined depending on the material of the film, the properties, the presence or absence of thermal adhesiveness, the purpose of use, etc., but is usually 5 to 100 μm, preferably 10 μm including the thickness of the thermal adhesive layer described below.
Approximately 50 μ.

The plastic film adhered to the non-woven fabric on the heat-bonding surface may have heat-bonding property by itself, or the surface thereof may be coated with a heat-bonding resin or laminated with a film of a heat-bonding resin. Although a separate heat-adhesive layer may be formed by doing so, the latter is preferable in that arbitrary heat-adhesiveness having a relatively low melting point can be imparted. The heat-adhesive resin may be one that can reliably adhere to the heat-bonded surface of the packaging material on the ventilation side at a relatively low temperature. For example, an ethylene-vinyl acetate copolymer (EV
A), ethylene-ethyl acrylate copolymer (EA
A), ethylene-methyl methacrylate copolymer (E
MMA), I-onomer and low density polyethylene (LD
PE) and the like are preferable because they have excellent thermal adhesiveness.

On the other hand, an adhesive layer is provided on the outer surface of the bag, but the film surface may be coated with an adhesive, or a double-sided adhesive sheet, tape or the like may be attached.
Generally, the thickness of the pressure-sensitive adhesive layer can be reduced, and therefore, the step due to the presence or absence of the pressure-sensitive adhesive layer is small, and good heat sealing can be performed. Therefore, it is preferable to apply the pressure-sensitive adhesive as in the former case. .

There is no particular limitation on the type of the adhesive, but normally, when the body warmer is adhered to an object to be kept warm such as underwear, it is firmly adhered and when peeled off, it does not remain on the side of the object to be kept warm. A non-transferable adhesive such as a rubber-based, acrylic resin-based, or vinyl acetate resin-based organic solvent-based or water-based non-transferable adhesive is used.

The pressure-sensitive adhesive layer is usually provided in such a manner that an uncoated part is partially left on at least the periphery (sealing part) of the surface of the bag of the body warmer. The uncoated part may be only the peripheral part of the bag, or may be a range reaching the central part. For example, when the body warmer is a rectangle such as a rectangle or a square, it is preferable to provide an adhesive layer at least at the four corners. In this case, the adhesive layer having a predetermined width is provided only on the opposite sides (left and right sides) of the adhesive layer surface. Is provided, and the central part is the uncoated part, and when the release paper is laid over the entire surface,
Since it is easy to insert a finger between the release paper and the release paper, the release paper can be easily removed during use, which is convenient. Further, if desired, a perforation line or the like may be provided along the central portion (uncoated portion of the adhesive) of the release paper for the purpose of making the release paper easier to peel off.

The area of the pressure-sensitive adhesive layer should be such that strength does not fall off naturally when the body warmer is attached to the object to be kept warm, and usually 10 to 9 with respect to the total area of one side of the bag.
The range is 0%, preferably 20 to 80%, and is determined depending on the shape, size, weight of the body warmer, the type of adhesive, and the like. In addition, the thickness of the adhesive layer is preferably thin from the viewpoint of the strength of the heat seal in that the difference in level with the uncoated portion is small, but in order to ensure sufficient adhesive force to the heat retention target, it is usually , 5 to 200 μ, preferably about 10 to 50 μ.

In the present invention, a release paper having substantially the same size as that of the pressure-sensitive adhesive layer is usually laminated on the entire surface of the pressure-sensitive adhesive layer.
As the release paper, a commercially available release sheet,
Those used for tapes, patches, stickers and the like can be used, and those having a release agent such as a silicone-based coating applied to the surface thereof to improve the releasability from the pressure-sensitive adhesive layer surface are preferable.

The heat-adhesive surface of the adhesive-side packaging material of the present invention is overlaid with the heat-adhesive surface of the ventilation-side packaging material and heat-sealed together at the peripheral portion to form a bag for body warmers. The ventilation side packaging material is breathable and has heat-adhesiveness on at least one side, and the material thereof is not particularly limited, but is usually a natural fiber, a synthetic fiber non-woven fabric, a woven cloth, paper, various synthetic resin films and These composite sheets and the like are used.

The material of the ventilation side packaging material is, for example, cotton,
Natural fibers such as hemp, silk, wool and rayon, nylon,
Mention may be made of non-woven and woven fabrics of synthetic fibers such as polyethylene, polypropylene, polyacrylic and polyvinyl chloride. The material of the synthetic resin film is, for example, polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, etc., and these non-breathable films are made breathable by making small holes with a needle, laser, or electric discharge machining. It may be something you have, or
A microperforated film having originally a large number of micropores may be used. Among these, a composite sheet of a non-woven fabric and a synthetic resin film having air permeability, a microporous film laminated with a non-woven fabric, or a synthetic resin perforated film is preferable.

Inside the bag for the body warmer obtained by heat-bonding the adhesive-side packaging material and the ventilation-side packaging material at their peripheral portions,
A main ingredient is oxidizable metal powder such as iron and aluminum, which is filled with an exothermic composition in which activated carbon, salt and other oxidation promoters, water and a water retention agent are mixed to form a body warmer with an adhesive. Furthermore, it is sealed and stored in a non-breathable bag and stored until use.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be specifically described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a pressure-sensitive adhesive processed packaging material for a body warmer according to the present invention, and FIG. 2a shows that the exothermic composition is sandwiched between the ventilation side packaging material and the adhesive side packaging material and the four sides are heat-sealed. Fig. 2 is a plan view of the obtained body warmer, Fig. 2b is a cross-sectional view taken along the line AA of the peripheral heat-sealing portion of the body warmer using the adhesive side packaging material of the present invention, and Fig. 3 is a comparative example. It is the sectional view on the AA line in FIG. 2a of the peripheral heat-sealing part of the body warmer which used the conventional packaging material only of the synthetic resin film for the material.

In FIG. 1, a non-woven fabric 1 having elasticity and flexibility is provided with a heat-adhesive plastic film 2 on one side and a plastic film 3 on the other side, which is a composite film film 2 laminated and fixed.
The surface on the side is a heat-bonding surface, and the surface on the film 3 side is an adhesive layer surface. Adhesives are applied to the opposite left and right peripheral portions of the adhesive layer surface to form the adhesive layer 4, and the central portion is an uncoated portion 5. A release paper 6 having a perforation (broken line) in the central portion is laminated on the entire surface of the adhesive layer to form a packaging material with an adhesive.

In FIG. 2a, the adhesive side packaging material 11 (lower side)
And the ventilation side wrapping material 12 (upper side) sandwiches a heat generating composition (not shown), and is heat-bonded to each other on the four sides of the periphery 13 to form a body warmer 14 with an adhesive. In FIG. 2b, the same adhesive side packaging material as that shown in FIG. 1, the plastic films 2 and 3 are adhered to both surfaces of the nonwoven fabric 1, and the surface of the packaging material film 2 formed of the adhesive layer 4 and the release paper 6 In addition, the ventilation side packaging material in which the microporous film 7 and the non-woven fabric 8 having thermal adhesiveness are laminated is superposed with the microporous film 7 inside and is heat-bonded to each other at the peripheral joint surface 10 of the bag of the body warmer. . Even if there is a step due to the pressure-sensitive adhesive layer 4 and the uncoated portion 5 when pressure is applied from both sides during thermal bonding, the elasticity and flexibility of the non-woven fabric 1 cause the bonding surface 10 to grow.
Since the entire surfaces of the sheets are evenly bonded and no gaps are created, thermal bonding is reliably performed.

Comparative Example In FIG. 3, the non-woven fabric 1 as shown in FIG. 2b is not used as the adhesive side packaging material, and one side of the plastic film 2'is a heat-bonding side, and the adhesive layer 4 and the release paper 6 are provided on the other side. On the heat-bonding surface of the adhesive side packaging material provided with, the ventilation side packaging material in which the microporous film 7 and the nonwoven fabric 8 having thermal adhesiveness are laminated is superposed with the microporous film 7 inside, and the bonding surface 10 'Is heat-bonded to each other. When pressure is applied from both sides during heat bonding, the bonding surface 10 ′ becomes non-uniform and a gap 9 is formed due to the influence of the step due to the pressure-sensitive adhesive layer 4 and the uncoated portion 5, so reliable heat bonding is performed. It is impossible.

Example 1 As an adhesive side packaging material, ethylene-vinyl acetate copolymer (thickness 20 μm), polyethylene (thickness 20 μm), nylon nonwoven fabric (thickness 150 μm, basis weight 20 g / m ² ), polyethylene (thickness 20μ) composite sheet with a width of 100 mm and a length of 1
The one cut into 50 mm was used. Of the 100 mm wide on this polyethylene surface, an uncoated part with a width of 20 mm is left in the center, and 30 g / m of acrylic resin adhesive around the long sides.
Coating was performed at a ratio of ² to provide a pressure-sensitive adhesive layer, and release paper was overlaid on the entire surface. On the other hand, as a ventilation side packaging material, a sheet made by laminating a polyethylene microporous film (thickness 100 μ) on a nylon nonwoven fabric (basis weight 40 g / m ² ) has a width of 100.
The one cut into mm and the length of 150 mm was used.

The ethylene-vinyl acetate copolymer side of the adhesive side packaging material and the microporous film side of the ventilation side packaging material were put together, and the periphery 3
One side is heat-bonded with a width of 6 mm to make a bag for body warmers, and iron powder 25 g, activated carbon 3 g, vermiculite 5 is put in this bag.
g, 1 g of salt, and 8 g of water were mixed to fill the exothermic composition. Subsequently, the area around the remaining opening was heated to 130 ° C. 10
It was sandwiched between two mm-square stainless steel rods, and a pressure of 3 kg / cm ² was applied to heat-bond it to form a body warmer. When the peripheral seal part was inspected, it was surely adhered and no powder spill was observed.

Comparative Example 1 A body warmer was manufactured in the same manner as in Example 1 except that ethylene-vinyl acetate copolymer (thickness 20 μm) / polyethylene (thickness 50 μm) was used as the adhesive side packaging material. As a result, powder spillage was confirmed, and as a result, it was confirmed that an unbonded gap was observed on the heat-bonded surface of the uncoated portion of the pressure-sensitive adhesive.

[0027]

The present invention is a pressure-sensitive adhesive processed packaging material for a body warmer using a non-woven fabric having elasticity and flexibility, and provides a soft and excellent feeling when worn as a body warmer. Also, when forming a bag for body warmers by heat bonding with the packaging material on the ventilation side, the peripheral part of the body warmer bag can be reliably heat-sealed without being affected by the step due to the presence or absence of an adhesive layer on the bonding surface. As a result, there is no fear of powder spilling and the like, and it becomes possible to efficiently produce a body warmer with an adhesive.

[0028]

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a pressure-sensitive adhesive processed packaging material for a body warmer according to the present invention.

FIG. 2 is a plan view a of an adhesive-equipped body warmer and a cross-sectional view b of a peripheral heat-bonded portion of the body warmer using the adhesive-side packaging material of the present invention.

FIG. 3 is a cross-sectional view of a peripheral heat-bonded portion of a body warmer using an adhesive side packaging material in the related art.

[Explanation of symbols]

 1 Nonwoven fabric 2, 3, 2'Plastic film 4 Adhesive layer 5 Uncoated part 6 Release paper 7 Microporous film 8 Nonwoven fabric 9 Gap 10, 10 'Bonding surface 11 Adhesive side packaging material 12 Vent side packaging material 13 Peripheral 14 Cairo

Claims (9)

[Claims] 1. A pressure-sensitive adhesive-processed packaging material for a body warmer, wherein a plastic film is laminated on both sides of an elastic and flexible non-woven fabric and fixed to each other, wherein one side is a heat-bonding side and the other side is a pressure-sensitive adhesive layer side. The adhesive-processed packaging material for body warmers, which has been characterized as: 2. The adhesive-processed packaging material for body warmer according to claim 1, wherein the material of the non-woven fabric is one or more selected from nylon, polyester, polyethylene, polypropylene, pulp and rayon. 3. The pressure-sensitive adhesive processed packaging material according to claim ² , wherein the nonwoven fabric has a thickness of 20 to 1000 μm and a basis weight of 10 to 50 g / m ² . 4. The adhesive-processed packaging material for body warmer according to claim 1, wherein the heat-bonding surface is a plastic film on which a layer of heat-bonding resin is formed. 5. The heat-adhesive resin is one or more selected from ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, ethylene-methyl methacrylate copolymers, I-onomer and low density polyethylene. The pressure-sensitive adhesive processed packaging material for a body warmer according to claim 4, which is 6. The pressure-sensitive adhesive processed packaging material for a body warmer according to claim 1, wherein the pressure-sensitive adhesive layer is formed by leaving an uncoated part at least at a peripheral portion of the surface of the pressure-sensitive adhesive layer. 7. The adhesive-processed packaging material for a body warmer according to claim 6, wherein the adhesive is a non-transferable adhesive. 8. The pressure-sensitive adhesive processed packaging material for a body warmer according to claim 6, wherein the pressure-sensitive adhesive layer has a thickness of 5 to 200 μm. 9. The adhesive-processed packaging material for a body warmer according to claim 1, wherein a release paper is laminated on the entire surface of the adhesive layer.