JPH02297362A - Heat-generative temperature keeping bag - Google Patents

Abstract

PURPOSE:To obtain a heat-generative temperature keeping bag which has the superior hand and drape and softness by uniformly forming a number of thermally press-fitted parts whose front and back surfaces are formed integrally through the partial thermal press-fitting in a web. CONSTITUTION:A web 3 has a number of thermally press-fitted parts 9 which are integrally formed through the partial thermal press-fitting of the obverse and reverse surfaces. In the partial thermally press-fitting of the web 3, the web 3 is allowed to pass through between a steel roll which is heated at the temperature lower than the melting point of a continuous filament which forms the web and has uneven surface and a steel roll having a smooth surface, or two steel rolls having uneven surfaces, and pressed. In this case, in the part contacting the projecting surface of the uneven surface roll of the web 3, filaments are thermally press-fitted by heat and pressure. Therefore, the hand and drape and softness are improved, and the soft feeling in use is obtained, and in the sealed part, the state where the intermediate layers are partially attached is generated, and the soft seal having the partially nonattached part is generated, and a temperature keeping bag 8 which is soft and free from foreign material feeling can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat-generating heat-retaining bag, and more particularly to a heat-generating heat-retaining bag with excellent flexibility in texture.

[Conventional technology]

A heat-generating thermos bag is made by laminating a heat-generating composition that generates heat in the presence of air, such as iron powder, inorganic salt, activated carbon, water, etc., with a non-woven fabric and a non-breathable resin film having ventilation holes. It is housed in a bag consisting of a covering layer and a lower covering layer made by laminating a non-porous non-breathable resin film and a non-woven fabric.Usually, the lower covering layer and the upper covering layer are overlapped, and heat is generated between them. It is manufactured by placing the composition and further heat-sealing the outer periphery (Japanese Patent Publication No. 57-148
Publication No. 14). In order to avoid contact with the air, these conventional heat-generating thermal bags (hereinafter simply referred to as thermal bags) are sealed and stored in bags made of non-breathable resin film (airtight bags), which are removed when used. By bringing the exothermic composition into contact with air, the exothermic composition reacts with the air and generates heat. Since this thermal bag starts generating heat immediately after being taken out of the airtight bag or container, it has other uses as a portable body warmer and other heat-generating agents.

However, since the conventional thermal bag uses a composite structure in which a nonwoven fabric is laminated with a resin film over the entire surface, the lamination strength is too strong, resulting in poor bag texture, such as poor flexibility when in contact with the human body. there were.

[Problem to be solved by the invention]

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

[Means to solve the problem]

The first aspect of the present invention is to have an air permeable multilayer structure obtained by laminating a web made of continuous filaments of a thermoplastic resin and a thermoplastic resin film on at least one side,
and 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 sides are integrated by partial thermocompression bonding. The present invention relates to a heat-generating thermal bag characterized by:

A second aspect of the present invention relates to the heat-generating heat-retaining bag, characterized in that the bulges of the non-thermo-compression bonded portions generated between the thermo-compression bonding portions are different on the front and back sides.

The third aspect of the present invention has a breathable multilayer structure obtained by laminating a web made of continuous filaments of a thermoplastic resin and a thermoplastic resin film on at least one side, and in the presence of air inside the structure. An exothermic heat-retaining bag containing an exothermic composition that generates heat, the periphery of the exothermic heat-retaining bag comprising:
The present invention relates to a heat generating bag characterized by having an uneven pattern in the thickness direction.

The exothermic composition used in the present invention serves as a heat source for the exothermic thermal bag, and is a composition that reacts by reaction with oxygen. The exothermic composition is not particularly limited as long as it generates heat in the presence of air, and for example, metal powder such as iron powder, NaCjLKCj2. MgCA2, CaCl2
Equal metal chlorides, K2SO4, Naz SO4, Mg30
A mixture of a metal sulfate such as No. 4 or another compound that can serve as a reaction aid, water and a humectant that absorbs water well (e.g. activated carbon, silica gel, wood flour, linter, etc.), and additives as necessary. used.

The web made of continuous filaments of thermoplastic resin used in the present invention is made of thermoplastic synthetic polymers such as polyamides such as nylon 6 and nylon 66, polyesters such as polyethylene terephthalate, and polyolefins such as polyethylene and polypropylene. A large number of continuous filaments formed by melt-spinning from a number of spinning nozzles are subjected to a pulling action by an air jet or the like, and then a web is formed on a moving collecting device. The advantage of using continuous filaments is that they are stronger than short fibers, and because they are formed into a web immediately after spinning, there is no need to apply oil or the like, and subsequent processability is excellent.

The single filament denier of the continuous filament is 0.5 to 1 from the viewpoint of breathability of the obtained web and prevention of fine powder leakage.
A range of 0 denier (value determined by microscopic method) is preferred.

In addition, the air permeability of the web is 300 to 10cc/c/・se
It is preferably in the range c (value measured by Frazier method air permeability test).

The web uniformly has a large number of thermocompression bonded parts on the front and back sides of which are integrated by partial thermocompression bonding. Partial thermocompression bonding of the web can be carried out, for example, by using a steel roll with an uneven surface (embossed roll) and a steel roll with a smooth surface, which are heated to a temperature lower than the melting point of the continuous filaments forming the web, or both rolls have uneven surfaces. This is done by passing it between two steel rolls and applying pressure.

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 part in contact with the concave part of the uneven surface roll is
Because the heat is only below the melting point and no pressure is applied, there is virtually no thermocompression bonding between the filaments.
The filament has a structure that allows it to bend freely. That is, the thermocompression bonded portion contributes to improving mechanical properties, and the non-thermocompression bonding portion contributes to improving the flexibility of the texture, tear strength, and providing breathability. The area of the thermocompression bonding part is preferably 3 to 50% of the total area from the viewpoint of flexibility.

Further, the thermocompression bonded portion may have a discontinuous pattern or a continuous pattern, but from the viewpoint of flexibility, a discontinuous pattern is preferable.

In addition, by using steel rolls with different degrees of unevenness (depth, spacing), it is possible to change the degree of bulge in the non-thermo-bonded areas on the front and back sides of the web, thereby improving printability, flexibility, etc. as described later. can do.

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, such as polyethylene, polypropylene, nylon, polyester, polyurethane,
In addition to single films such as polyvinyl chloride, vinylidene chloride, polyethylene/vinyl acetate, polyethylene/acrylic acid copolymers, etc., laminate films with two or more layers of these polymer compounds, such as polyethylene/ethylene vinyl acetate copolymers. , a laminated film of polyethylene/ethylene acrylate copolymer, etc. is used. Among these, those that can be firmly fused by heat sealing are preferred when forming the outer periphery heat fused portion on the inner surface of the bag.

The breathable multilayer structure used in the present invention can be obtained by, for example, laminating the web and the film and then punching ventilation holes in the film or the laminated sheet I, or by punching ventilation holes in advance. Obtained by laminating a film to a web. Lamination in this case can be done using conventional methods, such as single- or multi-layer extrusion lamination, in which a resin film is extruded and then immediately pressed onto the web for adhesion, or adhesive is applied to the film, which has been surface-treated to strengthen adhesion. After pre-drying, the adhesive may be laminated with a web and bonded under heating and/or pressure if necessary, thermocompression bonding, or the like. The shape, size, number of holes, etc. of the ventilation holes provided in the film are appropriately determined depending on the type of heat generating composition, the amount of ventilation of the web, the desired heat generation temperature, the desired heat generation time, the size of the thermal bag, etc. The amount of air passing through this vent hole is usually 93.5 cm on one side of the bag from the viewpoint of heat generation effect.
When set to T11, it varies depending on the application, but when measured by the ventilation test of the Frazier method, it is 0.5 to 40 cc/cl.
The range of ll'sec is preferable, and 0.5 to 15cc/c
A range of IIl·sec is more preferable. In addition, it is preferable to set it as the said range also when providing ventilation holes on both sides.

When vent holes are provided in the laminated sheet, the pores are designed to be small enough to prevent the heat-generating composition from leaking.

In the present invention, since a film is laminated with a web having a large number of thermocompression-bonded parts evenly, the unevenness of the thermocompression-bonded part and the non-thermocompression-bonded part causes a difference in the adhesion between the part and the laminate film. When the difference is large, the laminated portion is limited to the non-thermo-bonded portion of the web, which allows the laminated web to have flexibility. Furthermore, if the degree of bulge of the non-thermo-compression bonded part that occurs between the thermo-compression bonded parts of the web is made different on the front and back sides of the web, if a film is laminated on the side with the larger degree of bulge, the other side of the web will be Since the bulge is small and relatively smooth, it is easy to print on the surface. Conversely, when a film is laminated on the side with a small degree of bulge, the strength of the lamination between the web and the film improves, while the flexibility of the other side of the web can be improved due to the non-thermo-compression bonded part, which increases the flexibility during use. It is effective in improving the tactile sensation.

In addition, when a film is laminated to a nonwoven fabric with unevenness and the film is used as a peripheral sheet in the form of a bag with the film inside, the film in the concave parts of the web is difficult to adhere to even in the sealed part, and the soft seal has some non-adhesive parts. This results in a bag that does not look out of place.

In the present invention, the breathable multilayer structure is used on at least one surface of the heat generating bag. On the other side of the thermos bag, a multilayer structure made by laminating a nonwoven fabric and a non-breathable resin film can be used. As the resin film, the above-mentioned polymer compounds can be used.

Examples of nonwoven fabrics include nylon, polyethylene,
Nonwoven fabrics made from synthetic fibers such as polypropylene, polyester, polyurethane, acetylcellulose, vinyl chloride, vinylidene chloride, acrylic, etc. are preferred. A single fiber or a composite or mixed fiber product of two or more types can be used. Depending on the purpose, nonwoven fabrics and paper made of natural fibers such as cotton, hemp, silk, and wool, recycled fibers such as benbel, rayon, and pulp, and inorganic fibers such as glass fibers and asbestos fibers may also be used. Furthermore, it is also possible to use a web uniformly having a large number of thermocompression bonds integrated by the aforementioned partial thermocompression bonding.

The heat-generating thermal bag of the present invention contains a heat-generating composition in a thermal bag having the above-described breathable multilayer structure on at least one side,
It is obtained by heat-sealing the outer periphery of the bag. For thermal fusion, heat seeking such as a heating bar or heating roll sealer, impulse seeking, high frequency seeking, and ultrasonic seeking is usually used. By forming an uneven pattern in the thickness direction around the bag during the heat sealing, the flexibility of the seal portion can be further improved. Examples of the uneven pattern include silky, wavy, horizontal lines, vertical lines, and dot patterns.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to drawings and examples.

Fig. 1 is a partial sectional view of a heat-generating heat-retaining bag showing an embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a sectional view taken along the line ■-■ of Fig. 2. be.

In FIG. 1, the heat-generating composition 1 has an air permeable multilayer structure laminated with a web 3 having a partially thermocompressed portion and a resin film 2 provided with ventilation holes 4 as an upper layer, and has a non-porous top layer. A multi-layered structure obtained by laminating a resin film 5 and a non-woven fabric 6 is used as an undercoat layer, and is housed in a thermal bag 8 which is heat-sealed by a heat-sealing section 7.

Example 1 As exothermic composition 1, 25 g of iron powder (particle size: 44 μm)
, NaC! ! , 1.5g, activated carbon (particle size: 44μm)
og and 10 g of water were used. Among the above compositions, Na C
13 was used by dissolving it in water and absorbing it into activated carbon.

As the web 3, nylon 6 (resin relative viscosity (formic acid)) 2.
3) was extruded to create a web (50 g/r
rf) as shown in Figure 4.
Vertical 0.4 mm, horizontal 2.6 mm, crimp area ratio 11
%, depth 0.6 mm, pitch: 3° 4 mm vertically, 2.7 mm horizontally) and a heated roll with a flat surface, and the surface temperature of both the upper and lower rolls was 20°.
Partially preheated pressure bonding was carried out at 5°C and a pressure of 120 kg/cm. The cross section of the web at this time is shown in FIG. The thickness of this nonwoven fabric is 0.35 mm (Peacock type dial gauge 10
0g/c+fl load), thickness of preheated crimp part is 0.03
mm (micrometer), and the airflow rate when measured by the Frazier method air permeability test is 185 cc/c+f
It was f.sec. As the resin film 2 having ventilation holes, a film of non-air permeable low density polyethylene resin (M I 40, ρ=0.916) having a thickness of 50 μm was extruded and laminated.

After this, use the hot pin method to make holes on the film side, and
The surface area on one side is 93.5c ring (8,5X11.Ocm)
In contrast, the Frazier method produces 1.0cc/5eC0
It was made to be individual. This was used as the upper layer, and as the lower layer, an air-impermeable sheet obtained by laminating the polyethylene film 5 with a thickness of 50 μm and the nylon nonwoven fabric 6 was used.

The polyethylene layers of the upper and lower jackets were placed on top of each other with the polyethylene layers on the inside, and the periphery of the polyethylene layers was sealed on three sides using a heated roll seeker with a mesh pattern, and a heat-generating composition was filled through the openings to seal the openings. The width of each seal was 5 mm. The thermal bag 8 was further enclosed in a bag made of a polypropylene/polyethylene/ethylene-vinyl acetate three-layer laminate film coated with an impermeable barrier.

The outer bag was sealed using an impulse sealer manufactured by Fuji Seisakusho. When heat-sealing the outer periphery of the heat-insulating bag 8, an uneven pattern was formed (see FIG. 3).

The feel and flexibility of this heat-generating thermos bag was examined, and it was found to be superior to conventional thermos bags that were fully laminated.

In the above embodiment, instead of the embossing roll having the horizontally broken pattern shown in FIG. 4, it is possible to use an embossing roll having the pattern shown in FIGS. 4A to 4E. It is also possible to use webs shown in FIGS. 6 and 7, which are obtained by changing the degree of unevenness of the upper and lower embossing rolls and have different degrees of bulge in the non-thermo-bonded portions on the front and back sides. In the case of webs like those shown in Figures 5 and 6, if a film is laminated on the side with a large degree of bulge, the other side 7 of the web becomes a side with a small bulge or a smooth surface, so printing on this part, etc. This makes it easier to use, and the feel can also be improved.

Example 2 In Example 1, the embossing roll was made with a textured pattern (23% in terms of crimping area ratio, depth 0.3511I+ mm, pitch : Partial thermocompression bonding was carried out in the same manner as in Example 1 except that the length and width were 1 mm). The thickness of this nonwoven fabric is
0.21 mm (Peacock type dial gauge 100
g/c+tl load), the thickness of the thermocompression bonded part is 0.03
mm (micrometer), and the airflow rate when measured by the Frazier method air permeability test is 102 cc/cyM/
It was seC. The embossed roll side of this nonwoven fabric had clearly visible irregularities, while the flat roll side had a smooth surface. The smooth surface of this nonwoven fabric was extrusion laminated in the same manner as in Example 1 to produce a thermal bag.

Although it was a little hard due to partial thermocompression bonding, there was little fuzz on the surface, and the lamination strength was stronger and more secure than that of a film laminated on the embossed side.

〔Effect of the invention〕

The heat-generating thermal bag of the present invention uses a web having a heat-compression bonded part in which the front and back sides of the web are integrated by partial heat-compression bonding and are formed with a large number of depressions in the thickness direction, so when the film is laminated, the uneven effect It has the effect of partially bonding, has excellent flexibility in texture, and has a soft feel during use, and also has a state in which the intermediate layer is partially bonded in the seal area, that is, a soft material with partially non-bonded areas. Since it is a seal, it can be made into a flexible thermal bag that does not feel like a foreign body.

Furthermore, printability, flexibility, etc. can be improved by making the bulges of the non-thermo-compression bonded parts between the thermo-compression bonded parts different on the front and back sides.

Further, by forming an uneven pattern when heat-sealing the outer peripheral portion of the heat-insulating bag, the flexibility of the sealed portion can be improved in combination with the uneven effect in the thickness direction of the web.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a heat generating bag showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view taken along the line ■-■ of FIG. 2. Figure 4, Figure 4A, Figure 4B, Figure 4C
4D and 4E are diagrams showing an example of the uneven pattern of the embossing roll, and FIGS. 5, 6, and 7 are
FIG. 2 is a cross-sectional view of a thermocompression bonded nib. 1... Exothermic composition, 2.5... Resin film, 3.
... Web, 4... Ventilation hole, 5... Resin film,
7... Nonwoven fabric, 7... Heat fusion part, 8... Heat insulation bag,
9...Thermocompression bonding part.

Claims (3)

[Claims] (1) A heat-generating composition that has a breathable multilayer structure obtained by laminating a web made of continuous filaments of a thermoplastic resin and a thermoplastic resin film on at least one side, and that generates heat in the presence of air inside the structure. 1. A heat-generating heat-insulating bag containing an object, wherein the web uniformly has a large number of thermo-compression bonded parts whose front and back sides are integrated by partial thermo-compression bonding. (2) The exothermic heat-retaining bag according to claim (1), further characterized in that the non-thermo-compression bonded portions formed between the thermo-compression bonding portions have different bulges on the front and back sides. (3) A heat-generating composition that has a breathable multilayer structure obtained by laminating a web made of continuous filaments of a thermoplastic resin and a thermoplastic resin film on at least one side, and that generates heat in the presence of air inside the structure. A heat-generating heat-retaining bag containing an object, the heat-generating heat-retaining bag having a periphery having an uneven pattern in the thickness direction.