JP2758833B2 - Exothermic thermal insulation bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exothermic heat-insulating bag, and more particularly, to an exothermic heat-insulated bag having excellent texture flexibility.

[0002]

2. Description of the Related Art A heat-insulating bag comprises a heat-generating composition, such as iron powder, inorganic salt, activated carbon, water, etc., which is heated in the presence of air. It is housed in a bag consisting of an upper layer laminated with a film and a lower layer laminated with a non-porous air-impermeable resin film and a non-woven fabric, and usually, the lower layer and the upper layer are laminated. It is manufactured by placing a heat-generating composition in the meantime and heat-sealing the outer periphery thereof (Japanese Patent Publication No. 57-14814). This conventional heat-generating heat-insulating bag (hereinafter simply referred to as a heat-insulating bag) is further sealed and stored in a bag (airtight bag) made of a non-breathable resin film in order to avoid contact with air, and is taken out of the bag when used. By contacting with air, the exothermic composition reacts with air to generate heat. This heat-insulating bag starts generating heat immediately after being taken out of the airtight bag or the container, and thus has a wide variety of uses as a heating agent and other heating devices.

[0003] However, in the conventional thermal insulation bag, since a composite structure in which a resin film is laminated on the entire surface of a nonwoven fabric is used, the lamination strength is too strong and the feeling of the bag body, for example, the flexibility when contacting the human body is inferior. There was a disadvantage.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art and to provide a heat-generating heat-insulating bag excellent in texture and flexibility.

[0005]

According to the present invention, there is provided at least one surface of a gas-permeable multilayer structure obtained by laminating a web composed of continuous filaments of a thermoplastic resin with a thermoplastic resin film, A heat-generating heat-insulating bag containing a heat-generating composition that generates heat in the presence of air, wherein the web uniformly has a large number of thermocompression-bonded parts whose front and back are integrated by partial thermocompression bonding. An exothermic heat-insulating bag, wherein the periphery of the heat-insulating bag has an uneven pattern in a thickness direction.

The exothermic composition used in the present invention is a composition which becomes a heat source of the exothermic heat-insulating bag and reacts by reaction with oxygen. The heat-generating composition is not particularly limited as long as it generates heat in the presence of air. For example, NaCl, KCl, MgCl ₂ , C
Metal chlorides such as aCl ₂ , K ₂ SO ₄ , Na ₂ SO ₄ , M
A mixture obtained by mixing a metal sulfate such as gSO ₄ or a compound that can be a reaction aid, water and a humectant that absorbs water well (eg, activated carbon, silica gel, wood flour, linter, etc.), and additives as required. Is used.

The web composed of continuous filaments of the thermoplastic resin used in the present invention is made of, for example, a thermoplastic synthetic resin such as polyamides such as nylon 6 and nylon 66, polyesters such as polyethylene terephthalate, and polyolefins such as polyethylene and polypropylene. It is obtained by subjecting a large number of continuous filaments formed by melt-spinning a polymer substance from a large number of spinning nozzles to a traction action by an air jet or the like, and then forming a web on a moving collecting device. The advantages of using continuous filaments are that they are stronger than those using short fibers, do not require an oil agent or the like to be adhered to the web immediately after spinning, and are excellent in workability later.

The single filament denier of the continuous filament is as follows:
From the viewpoints of air permeability of the obtained web and prevention of leakage of the fine powder, a range of 0.5 to 10 denier (value by a microscope method) is preferable. The air permeability of the web is 300 to 10 cc /
It is preferably in the range of cm ² · sec (value measured by the Frazier method air permeability test). The web uniformly has a large number of thermocompression-bonded portions whose front and back are integrated by partial thermocompression. Partial thermocompression of the web is performed, for example, by heating a steel roll having an uneven surface (embossed roll) and a steel roll having a smooth surface, or both having an uneven surface, which is heated to a temperature lower than the melting point of the continuous filaments forming the web. This is done by passing between two steel rolls and pressing. In this case, in the portion of the web that is in contact with the convex portion of the uneven surface roll, the filaments are thermocompressed by the action of heat and pressure. On the other hand, the portion of the concave-convex surface roll in contact with the concave portion is heated only below the melting point and is not pressurized, so that the filament is substantially not thermocompression-bonded and has a structure in which the filament can be freely bent. That is, the thermocompression bonding part contributes to the improvement of mechanical properties, and contributes to the improvement of the feel of the non-thermocompression bonding part, the improvement of tear strength, and the provision of air permeability. The area of the thermocompression bonding portion is preferably 3 to 50% of the total area from the viewpoint of flexibility. The thermocompression bonding portion may be a discontinuous pattern or a continuous pattern, but is preferably a discontinuous pattern from the viewpoint of flexibility.

Further, by using steel rolls having different degrees of unevenness (depth and interval), the degree of swelling of the non-thermocompression bonding portion on the front and back of the web can be changed, thereby improving printability and flexibility as described later. Etc. can be improved. The thermoplastic resin film used in the present invention is not particularly limited as long as it is a non-breathable polymer compound that can be laminated with the web, for example, polyethylene, polypropylene, nylon, polyester, polyurethane, polyvinyl chloride, In addition to single films such as copolymers of vinylidene chloride, polyethylene / vinyl acetate, polyethylene / acrylic acid, etc., laminated laminate films of two or more of these polymer compounds, for example, polyethylene / ethylene-vinyl acetate copolymer, polyethylene / ethylene A laminated film such as an acrylate copolymer is used. Of these, those which are firmly fused by heat sealing when forming the outer heat-fused portion on the inner surface side of the bag are preferable.

[0010] The air-permeable multilayer structure used in the present invention comprises:
For example, it can be obtained by laminating the web and the film and then perforating the film or the laminated sheet, or laminating a film having a pre-perforated hole to the web. The lamination at this time is a conventional method, for example, a resin film is extruded, and a single-layer or multilayer extrusion lamination method in which the resin film is immediately pressed and adhered to the web, an adhesive is applied to a film that has been subjected to a surface treatment for enhancing adhesion, After the preliminary drying, it can be carried out by a method of superimposing on a web and bonding it under heating and / or pressure as needed, thermocompression bonding, or the like. The shape, size, number of holes, etc. of the air holes provided in the film are appropriately determined depending on the type of the heat-generating composition, the amount of air flow of the web, the desired heat generation temperature, the desired heat generation time, the size of the heat retaining bag, and the like. The amount of air passing through the vent hole is usually from the viewpoint of the heat generation effect, when the one-sided area of the bag is 93.5 cm ² . 5-40
The range of cc / cm ² · sec is preferable, and 0.5 to 15 cc /
The range of cm ² · sec is more preferred. In addition, when providing a ventilation hole on both surfaces, it is preferable to set it as the said range. When air holes are provided in the laminated sheet, the air holes are small enough to prevent leakage of the heat generating composition.

In the present invention, since a web and a film having a large number of thermocompression-bonded portions are laminated, the adhesiveness between the thermocompression-bonded portion and the non-thermocompression portion causes a difference in the adhesion between the thermocompression-bonded portion and the laminated film. In particular, when the unevenness difference is particularly large, the portion to be laminated is limited to the non-thermocompression bonding portion of the web, so that the laminated web can have flexibility. Further, when the degree of swelling of the non-thermocompression part generated between the thermocompression bonding parts of the web is made different on the front and back of the web, when a film is laminated on the surface having a large degree of swelling, the other surface of the web swells. small,
Since the surface is relatively smooth, it is easy to print or the like on the surface. Conversely, when the film is laminated on a surface having a small degree of swelling, the lamination strength of the web and the film is improved, while the flexibility of the other surface of the web can be improved by the non-thermocompression bonding portion. This is effective for improving the tactile sensation.

When a non-woven fabric having a difference in unevenness is laminated with a film and the periphery of the film is sealed in a bag shape with the film inside, the film in the concave portion of the web is hardly adhered to the sealed portion, and the non-adhered portion is partially removed. It becomes a soft seal and a bag without a sense of incongruity. In the present invention, the air-permeable multilayer structure is used on at least one surface of a heat-generating heat-insulating bag. On the other side of the heat retaining bag, a multilayer structure in which a nonwoven fabric and a resin film having no air permeability are laminated can be used. As the resin film, the above-described polymer compound can be used. As the nonwoven fabric, for example, a nonwoven fabric made of synthetic fibers such as nylon, polyethylene, polypropylene, polyester, polyurethane, acetylcellulose, vinyl chloride, vinylidene chloride, and acrylic is preferable. A single product or a product composed of two or more composite or mixed fibers can be used. Depending on the use, nonwoven fabric and paper made of natural fibers such as cotton, hemp, silk, wool, etc., regenerated fibers such as Bemberg, rayon, pulp, etc., and inorganic fibers such as glass fiber and asbestos fiber can also be used. Further, it is also possible to use a web having a large number of thermocompressions uniformly integrated by the above-mentioned partial thermocompression bonding.

The heat-generating heat-insulating bag of the present invention is obtained by housing the heat-generating composition in the heat-insulating bag having the above-mentioned air-permeable multilayer structure on at least one surface, and heat-sealing the outer periphery of the bag. For heat fusion, for example, a heat sealer such as a heating bar or a heating roll sealer, an impulse sealer, a high-frequency sealer, or an ultrasonic sealer is generally used. By forming a concavo-convex pattern in the thickness direction around the bag body during the heat fusion, the flexibility of the seal portion can be further improved. Examples of the pattern of the concavo-convex pattern include a silk pattern, a wavy pattern, a horizontal line, a vertical line, and a dot pattern.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings and embodiments. FIG. 1 is a partial cross-sectional view of an exothermic heat-insulating bag showing one embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. is there. In FIG. 1, a heat-generating composition 1 has an air-permeable multilayer structure obtained by laminating a web 3 having a partial thermocompression bonding portion and a resin film 2 provided with air holes 4, and has a non-porous layer. A multilayer structure in which a resin film 5 and a nonwoven fabric 6 are laminated is used as a lower layer, and these are housed in a heat insulation bag 8 which is heat-sealed by a heat-sealing section 7. Example 1 As an exothermic composition 1, 25 g of iron powder (particle diameter: 44 μm)
NaCl 1.5 g, activated carbon (particle size: 44 μm) 10 g
And 10 g of water. Of the above composition, NaCl was dissolved in water and absorbed into activated carbon before use.

As the web 3, a nylon resin (relative viscosity
(Formic acid) 2.3) obtained by extrusion and spunbonding
Web made of nylon filament (single yarn 2d / f)
(50 g / m^Two), Which is shown in FIG.
Cut wire pattern (vertical 0.4mm, horizontal 2.6mm, crimping area ratio 1
1%, depth 0.6 mm, pitch: vertical 3.4 mm, horizontal 2.
7mm) and heating of flat surface
Pass through the rolls, surface temperature both upper and lower rolls 205 ° C, 20kg
/ Cm pressure was partially pre-heated and pressed. Web break at this time
The surface is shown in FIG. The thickness of this web is 0.35mm
(Peacock dial gauge 100g / cm^Twoload),
The thickness of the thermocompression bonding part is 0.03 mm (micrometer)
And air permeability as measured by the air permeability test of the Frazier method
Is 185cc / cm ^Two-It was sec. Trees with vents
The fat film 2 has a thickness of 50 μm and a non-permeable low density.
Polyethylene resin (MI40, ρ = 0.916)
The film was extruded and laminated. After this, the hot pin method
A hole was made on the film side to increase the surface area per side of one warmer to 93.
5cm^Two(8.5 × 11.0cm)
It was adjusted to 1.0 cc / sec by the rule method. this
An upper coating layer and a lower coating layer having a thickness of 50 μm
Tylene film 5 and nylon nonwoven fabric 6 were laminated
A non-breathable sheet was used as it was.

[0016] The upper and lower polyethylene layers are superposed on each other, and the three sides thereof are sealed with a heating roll sealer having a silk pattern. Sealed. Each seal width was 5 mm wide. The heat retaining bag 8 was further enclosed in a bag made of a polypropylene / polyethylene / ethylene vinyl acetate three-layer laminate film with a non-breathable barrier coating.

The outer bag seal was fused using an impulse sealer manufactured by Fuji Seisakusho. When the outer periphery of the heat retaining bag 8 was heat-sealed, an uneven pattern was formed (see FIG. 3). The texture and flexibility of this heat-generating heat-insulating bag were examined, and it was better than the conventional heat-insulating bag with a full-surface lamination. In the above embodiment, embossing rolls having the patterns shown in FIGS. 5 (a) to 5 (e) can be used instead of the embossing rolls having the horizontal breaking pattern shown in FIG. 7 and 8, webs having different degrees of swelling of the front and back non-thermocompression bonding portions obtained by changing the degree of unevenness of the upper and lower embossing rolls can also be used. In the case of a web as shown in FIGS. 6 and 7, if a film is laminated on a surface having a large degree of swelling, the other surface of the web becomes a surface with a small swelling or a smooth surface. It becomes easier, and the feel and the like can be improved.

[0018]

According to the heat-generating heat-insulating bag of the present invention, since a web having a plurality of thermocompression-bonded portions in which the front and back of the web are integrally formed by partial thermocompression and formed with depressions in the thickness direction is used, a film is laminated. At the time, it has the effect of partial lamination due to the unevenness effect, excellent flexibility of texture, soft feel at the time of use, and also the web and resin film in the seal part have a non-adhesive part, The sealing portion can also be made into a heat-insulating bag that is flexible and free of foreign matter.

Further, by making the swelling of the non-thermocompression part between the thermocompression bonding parts different between the front and back sides, printability, flexibility and the like can be improved. In addition, by forming an uneven pattern when the outer peripheral portion of the thermal insulation bag is heat-sealed, the flexibility of the seal portion can be improved in combination with the unevenness effect in the thickness direction of the web.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an exothermic heat-insulating bag showing one embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a diagram showing an example of a concavo-convex pattern of an embossing roll.

FIG. 5 is a diagram showing an example of a concavo-convex pattern of an embossing roll.

FIG. 6 is a cross-sectional view of a thermocompression-bonded web.

FIG. 7 is a cross-sectional view of a thermocompression-bonded web.

FIG. 8 is a cross-sectional view of a thermocompression-bonded web.

[Explanation of symbols]

1: exothermic composition, 2: 5, resin film, 3: web,
4 ... vent hole, 6 ... nonwoven fabric, 7 ... heat seal part, 8 ... heat insulation bag, 9 ... thermocompression bonding part.

Claims (1)

(57) [Claims] 1. A gas-permeable multilayer structure obtained by laminating a web composed of continuous filaments of a thermoplastic resin and a thermoplastic resin film on at least one surface, and generates heat in the presence of air therein. An exothermic heat-insulating bag containing an exothermic composition, wherein the web uniformly has a large number of thermocompression-bonded parts whose front and back are integrated by partial thermocompression,
An exothermic heat-insulating bag, wherein the periphery of the exothermic heat-insulating bag has an uneven pattern in a thickness direction.