JP2006239015A - Bag for storing exothermic composition and heating instrument using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag for storing an exothermic composition and a heating instrument which have an excellent attachability that prevents peeling off of the heating instrument from the skin or clothes and reduces uncomfortable feeling due to a warp by preventing a warp of a sealed peripheral section or a warp of the heating instrument that makes the sealed peripheral section to face outside even when the temperature of an exothermic body or the heating instrument rises due to the generation of heat. <P>SOLUTION: The bag for storing an exothermic composition and the heating instrument using the bag is provided. The bag is used for storing an exothermic composition that generates heat in the presence of air containing moisture. One side of the bag for storing an exothermic composition is made of an air-permeable multilayered structure obtained by laminating a porous film on a nonwoven fabric, and the other side of the bag is an attaching face having an attaching means. The air-permeable multilayered structure is characterized by that the dimensional change ratio of the lateral dimensions at 50°C to the dimensions at 20°C is positive and that the multilayered structure has a compression energy of 0.15 gfcm/cm<SP>2</SP>or more. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag for containing an exothermic composition and a heating tool using the same. Specifically, the present invention relates to a heat-generating composition storage bag suitable for a heating tool for applying to an adherend, and a heating tool using the same.

  Heating devices used by attaching to clothes or skin, such as so-called disposable warmers and medical warm compresses, are often used as a heating element in which a heat generating composition is contained in a bag made of a breathable sheet. Yes. Such a heating element can control the temperature and time of heat generation by adjusting the breathability of the breathable sheet. However, since the exothermic composition is cured when it generates heat, there is a problem in that it causes discomfort to the human body, adhesion of the heating device to the human body is deteriorated, and the heating device is peeled off from clothing. In order to solve such a problem, a bag made of a breathable overcoat layer and a non-breathable layer obtained by laminating a web having a large number of thermocompression bonding portions made of continuous filaments of thermoplastic resin and a thermoplastic resin film ( For example, the thing which was excellent in the softness | flexibility of a texture like the patent document 1) and the thing (for example, patent document 2) with which the circumference | surroundings of a heat insulation bag have an uneven | corrugated pattern in the thickness direction has been proposed.

However, even if such a bag is used, sufficient effects have not yet been obtained with respect to the problem that the heating tool adheres to the human body or peels off from clothing. That is, when the thermal tool is attached to clothing or skin and used, as the temperature rises due to heat generation, the sealed peripheral part and the thermal tool itself warp with the peripheral part outward, causing discomfort. Each time the user moves, there is a problem that the heating tool comes off from the clothing or the like due to the heating tool coming into contact with the upper garment.
JP-A-2-297362 JP-A-7-67907

  The object of the present invention is to reduce the warping of the sealed peripheral portion and the peripheral portion generated in the thermal device itself to the outside even when the temperature of the heating element or the heating device is increased due to heat generation. As a result, it is an object of the present invention to provide an exothermic composition-containing bag and a heating tool that do not cause discomfort due to warping, have good adhesion, and do not peel off the heating tool from clothing or skin.

  As a result of intensive studies to improve the above problems, the present inventors have obtained a breathable multilayer structure obtained by laminating a nonwoven fabric and a porous film, and the lateral direction during heating to normal temperature is as follows. It has been found that all of the above problems can be solved by using a breathable multilayer structure having a positive dimensional change rate and a specific range of compression energy on one side of a bag for containing a heat generating composition. The present invention has been completed.

The present invention
[1] One side is made of a breathable multilayer structure obtained by laminating a nonwoven fabric and a porous film, and the other side is an affixing surface having an affixing means, and contains heat and generates heat in the presence of air. A bag for containing an exothermic composition, wherein the breathable multilayer structure has a positive dimensional change rate at 50 ° C. relative to a size at 20 ° C., and 0.15 gfcm / a bag for containing a heat-generating composition, characterized by having a compression energy of cm ² or more;
[2] The bag for containing a heat generating composition according to [1], wherein the nonwoven fabric is manufactured by a water jet method;
[3] A heating tool characterized in that the exothermic composition that generates heat in the presence of air is contained in the exothermic composition-containing bag according to [1] or [2].
[4] The heating tool according to [3], which is housed in an airtight outer bag,
I will provide a.

  According to the present invention, the warpage to the outside of the peripheral edge portion sealed by the heat generation by the exothermic composition and the peripheral edge portion of the heating device itself is improved, the discomfort due to the warpage does not occur, the adhesiveness is good, and the clothes or skin An exothermic composition-containing bag and a heating tool that are not peeled off are provided.

  In the exothermic composition housing bag of the present invention, one surface is a breathable multilayer structure, and the other surface is a pasting surface having a pasting means.

The breathable multilayer structure used in the present invention can be obtained by laminating a nonwoven fabric and a porous film. The breathable multilayer structure has (1) a positive dimensional change rate at 50 ° C. with respect to the size at 20 ° C. and (2) a compression energy of 0.15 gfcm / cm ² or more. It is characterized by having.

  Here, the “dimensional change rate” is a comparison between a dimension (original dimension) (A) in a reference state and a dimension (B) in a different state, and the amount of change (B -A) divided by the value of the standard dimension (A) and calculated by 100%. If the dimension in the above different state is reduced compared to the standard dimension, it becomes a negative value and increases. If it is, it becomes a positive value. For example, the dimensional change rate of + 0.2% represents that when the reference length is 100, it is 100.2. Therefore, “the rate of dimensional change at 50 ° C. relative to the dimension at 20 ° C.” is a value calculated by comparing with the dimension measured at 50 ° C. with the dimension measured at 20 ° C. as the reference, and the former is larger than the latter. If the latter is greater than the former, the value is positive.

  Specifically, the dimensional change rate at 50 ° C. with respect to the size at 20 ° C. can be measured as follows.

The multi-layer structure has a temperature of 20 ± 2 ° C. and a humidity of 80 ± 5% R.D. H. After adjusting the temperature for 5 hours, cut out to 200.0 mm × 200.0 mm to prepare a test piece. This test piece was subjected to a temperature of 50 ± 2 ° C. and a humidity of 5 ± 1% R.D. H. The horizontal length a (mm) after 1 hour is measured. The dimensional change rate of each specimen is
(A-200.0) /200.0×100 (%)
Is calculated as The average of three points (three test pieces) is defined as the dimensional change rate of the multilayer structure.

  In addition, the “lateral direction” means a direction (TD) that intersects at a 90 ° angle with respect to the flow direction (also referred to as machine direction, MD, or longitudinal direction) of the nonwoven fabric and the porous film constituting the multilayer structure. Also called).

  The multilayer structure used in the present invention requires that the dimensional change rate at 50 ° C. with respect to the dimension at 20 ° C. is a positive value (that is, greater than zero) in the lateral direction. Is preferably + 0.2% or more, more preferably + 0.4% or more. If the rate of dimensional change in the lateral direction is not a positive value, the bag body is filled with a heat-generating composition to produce a heating tool, and when heated, the sealed peripheral edge and the heating tool itself have a peripheral edge. As a result, the warp tends to warp outward, and as a result, the warp may be uncomfortable or the thermal device may be easily peeled off from the adherend.

In addition, the breathable multilayer structure used in the present invention needs to have a compression energy of 0.15 gfcm / cm ² or more. Here, the compression energy is energy absorbed at the time of compression per 1 cm ² and can be measured as follows.

  A test piece is prepared by cutting a breathable multilayer structure into a size of 125 mm × 50 mm. This test piece was measured at a temperature of 20 ± 2 ° C. and a humidity of 40 ± 5% R.D. H. After adjusting the temperature for 5 hours, use a handy compressor KES-G5 (manufactured by Kato Tech Co., Ltd.) to compress and deform at a constant speed from the surface on the porous film side in the thickness direction under the following conditions, and the load at that time Measure continuously, calculate from the chart obtained and read the value of the compression energy displayed on the device. Three times (three test pieces) are measured, and the average of these is taken as the compression energy of the multilayer structure.

Measurement condition:
KES-FB SYSTEM data measurement program COMPRESION G5 characteristic standard condition SENS: 2
DEF OUT 5mm / 10V
Compression deformation speed: 0.02 mm / sec
Maximum load: 50 g / cm ²
Pressure plate area: 2 cm ²

Compression energy is preferably 0.15~0.25gfcm / cm ^2, more preferably 0.18~0.25gfcm / cm ^2. When the compression energy is less than 0.15 gfcm / cm ² , the heating element is produced by filling the bag body with the exothermic composition. When the heating tool is heated, the peripheral part is exposed to the sealed peripheral part and the thermal tool itself. Warping tends to occur, giving an uncomfortable feeling due to warping, and the heating tool may be peeled off from the adherend. In addition, when the compression energy is 0.25 gfcm / cm ² or less, there is no floating between the nonwoven fabric and the porous film, and a sealing failure is unlikely to occur when the exothermic composition-containing bag is produced.

The breathable multilayer structure in the present invention has a positive dimensional change rate in the lateral direction and has a predetermined compressive energy, thereby warping the peripheral portion and the peripheral portion of the heating device itself to the outside. The reason why the effect of improving the temperature can be obtained is assumed as follows. That is, the warping is considered to be strain (stress) due to heat shrinkage. When the exothermic composition generates heat, the longitudinal direction (flow direction) of the breathable multilayer structure shrinks uniformly, but the lateral dimensional change rate is a positive value (that is, the lateral direction extends). The strain is absorbed. Further, when the exothermic composition generates heat, the composition is cured and strain is also generated in the direction perpendicular to the plane of the breathable multilayer structure, but the compression energy of the breathable multilayer structure is large (that is, This strain is absorbed when soft and low rebound. Thus, the horizontal / vertical generated by thermal contraction due to the positive dimensional change rate of the breathable multilayer structure and the large compression energy (0.15 gfcm / cm ² or more). Any strain in the direction can be absorbed, resulting in a reduction or prevention of warping of the breathable multilayer structure.

  The breathable multilayer structure usable in the present invention as described above can be produced by laminating a combination of any known nonwoven fabric and porous film.

  The dimensional change rate of the multilayer structure can be controlled to a desired value by controlling the average official moisture content, production method, basis weight, film thickness, and the like of the nonwoven fabric.

Moreover, it can implement | achieve that the compression energy of a multilayer structure shall be 0.15 gfcm / cm < ² > or more by controlling the manufacturing method, fabric weight, film thickness, etc. of a nonwoven fabric.

  The fibers constituting the nonwoven fabric used in the multilayer structure preferably have an official moisture content of 2.0% or less. More preferably, it is 1.0% or less, Most preferably, it is 0.7% or less. When the official moisture content is 2.0% or less, the dimensional change rate in the lateral direction at 50 ° C. with respect to the size at 20 ° C. of the breathable multilayer structure tends to be a positive value.

  Here, in the case of a nonwoven fabric composed of two or more kinds of fibers, the official moisture content is an average official moisture content (sum of values obtained by multiplying the weight% of the constituent fibers by the official moisture content of the fibers). For example, the average official moisture content of a non-woven fabric consisting of 85% by weight of polyester fiber with an official moisture content of 0.4% and 15% by weight of rayon with an official moisture content of 11.0% is (0.4 × 0.85) + ( 11.0 × 0.15) = 1.99 (%).

  Any known method may be used as the method for producing the nonwoven fabric used in the present invention. For example, a papermaking method, a card method, a melt blow method, a spunbond method, a water jet method, and the like can be used, but the water jet method is preferably used from the viewpoints of flexibility, shrinkage, and the like. The water jet method is a method in which a high-pressure water jet is applied to a fiber web on a woven belt on a perforated drum or a non-perforated roller, and the fibers are entangled. Both the spun lace method, jet lace method, jet punch method, etc. be called. By interlacing the nonwoven fabrics by the water jet method, the fibers can be integrated without reducing the air permeability of the resulting nonwoven fabric.

  The nonwoven fabric produced by the water jet method has good air permeability, and has a low hardness and a soft feel, so that the uncomfortable feeling during use is reduced. Furthermore, since the entanglement between the fibers is not strong, the compression energy increases, it is advantageous for the rate of dimensional change in the lateral direction at 50 ° C. relative to the size at 20 ° C., and is suitable for preventing warping of the heating tool. It is preferable as a non-woven fabric used in Particularly preferred is a nonwoven fabric containing polyester fibers obtained by the water jet method.

From the viewpoint of appropriate air permeability and warpage prevention, the basis weight of the nonwoven fabric is preferably 20 to 100 g / m ² , more preferably 30 to 80 g / m ² . The film thickness is preferably 0.1 mm to 1 mm.

  The types of fibers used in the nonwoven fabric used in the present invention include polyolefin fibers such as polypropylene and polyethylene, polyester fibers such as polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, and hydrophobic synthetic fibers such as acrylic synthetic fibers. These may be used alone or in combination. The fiber may be either a short fiber or a long fiber. From the viewpoint that the official moisture content is small, polyolefin fibers and polyester fibers are preferably used. Polyester fibers are particularly preferred from the viewpoints of shrinkage, rigidity, heat resistance and the like.

  As described above, when a plurality of types of fibers are combined, the average official moisture content of all fibers used in the nonwoven fabric may be 2.0% or less, and fibers other than the above having a large official moisture content, such as nylon 6, A combination of polyamide-based fibers such as nylon 6 and 6 and semi-synthetic fibers such as rayon, natural fibers such as cotton, and the above-mentioned hydrophobic synthetic fibers having a low official moisture content can also be used.

  The fineness of the fiber is preferably 0.5 to 10 dtex, more preferably 0.8 to 8 dtex, and particularly preferably 2 to 5 dtex from the viewpoint of the strength of the nonwoven fabric and good flexibility. When the fineness is 0.5 to 10 dtex, the strength and flexibility of the nonwoven fabric are improved.

  About the porous film used in this invention, a thermoplastic resin is used as a base material. Thermoplastic resins include polyolefins such as low density (LD), linear low density (LLD), high density (HD) and metallocene catalyst (VLD) polyethylene (PE), EVA and ethylene, propylene , Polyolefin copolymer such as butene, polyamide, polyester, polyurethane, polyvinyl chloride, vinylidene chloride, or the like, or a microporous film having moisture permeability may be used. Moreover, what combined these 2-3 layers may be used. From the viewpoint of flexibility, sealing properties, and cost, polyethylene or a copolymer olefin film thereof is preferable.

  As the porous film, a stretched porous film is preferable. For example, a resin composition obtained by uniformly dispersing a filler such as calcium carbonate in a thermoplastic resin by melt kneading is processed into a sheet, and the resulting film or sheet is stretched by a conventionally known method A porous film can be obtained by generating a large number of small voids (microvoids) in a film or sheet to make it microporous.

As for the stretching direction, a porous film obtained by stretching in only one direction (uniaxial stretching) is usually used, but a porous film stretched in multiple directions (for example, a biaxially stretched porous film) may be used. it can.
The pore diameter of the porous film is preferably 0.01 to 10 μm, more preferably 0.1 to 5 μm.

  The breathable multilayer structure used in the present invention can be obtained by laminating a nonwoven fabric and a porous film. Any conventionally known method can be applied as a method of laminating. For example, thermal bonding or a method of laminating with an adhesive such as a hot-melt adhesive or an acrylic or urethane adhesive may be used, or it may be a full-surface bonding or a partial bonding to maintain flexibility. . Preferably, a curtain spray method or a dry lamination method is used.

  The breathability of a breathable multilayer structure in which a nonwoven fabric and a stretched porous film are laminated is measured by the Gurley method (JIS P-8117) in consideration of the shrinkability, adhesion and sufficient heat generation characteristics of the bag material. It is preferably 8,000 to 80,000 seconds / 100 cc.

  Further, on the surface other than the breathable multilayer structure of the bag for containing the heat generating composition (that is, when the surface composed of the breathable multilayer structure is one surface, the other surface; hereinafter referred to as “sticking surface”) Can be provided with an attaching means for attaching to an adherend such as clothes or skin. As a sticking means, as long as the purpose of sticking to a desired adherend is achieved, a layer composed of a known pressure-sensitive adhesive, hot compress, etc. can be arbitrarily selected and used. Such a layer may be provided on the entire sticking surface or may be provided partially.

  As a film used for the sticking surface, a known non-breathable or breathable thermoplastic resin film (which may be a single layer or a multilayer) may be used. As the thermoplastic resin, the same resin as that used for the stretched porous film can be used. A film having a thickness of 20 μm to 100 μm is preferably used.

  The dimensional change rate of the thermoplastic resin film is preferably equal to or higher than the dimensional change rate of the breathable multilayer structure, and more preferably higher. When the dimensional change rate of the thermoplastic resin film is equal to or greater than the dimensional change rate of the breathable multilayer structure, the sealed peripheral part of the thermal tool and the thermal tool itself warp with the peripheral part outward. It becomes difficult. Further, a non-breathable multilayer structure in which a nonwoven fabric is laminated on this thermoplastic resin film can be used. In that case, the non-breathable side nonwoven fabric is not limited to the nonwoven fabric of the fibers, and any other known arbitrary ones. Nonwoven fabrics can also be used.

  By stacking the film constituting the breathable multilayer structure and the sticking surface as described above with the porous film side of the breathable multilayer structure inside, and joining the peripheral edge by any known method, The exothermic composition housing bag of the present invention can be formed. Examples of the bonding method include a method using an adhesive and a method using heat sealing, and heat sealing is preferable.

  The heating element or the heating tool of the present invention can be produced by filling the heating composition-containing bag of the present invention with the heating composition. In the context of the present invention, the term “heating tool” refers to a so-called disposable body warmer for warming, a medical heating pad structure, a cosmetic heating tool, or the like, directly on the skin or clothes. It refers generally to those used to provide heat to the human body indirectly.

The exothermic composition that can be used in the present invention is a composition that generates heat by reaction with oxygen and is not particularly limited as long as it contains moisture. For example, metal powder such as iron powder, metal chloride such as NaCl, KCl, MgCl ₂ , CaCl ₂ , metal sulfate such as K ₂ SO ₄ , Na ₂ SO ₄ , MgSO ₄ , or other reaction aid. Known compounds (for example, activated carbon), water and water retention agents that absorb water well (such as silica, vermiculite, wood flour, linters, polymeric water-absorbing materials such as water-absorbing resins), and other additives as necessary Generally, a mixture prepared by a known method at a compounding ratio of 1 is used.

  Production of a heating tool using the exothermic composition-accommodating bag of the present invention can be performed by any conventionally known method. For example, as described above, the bag of the present invention is produced with the nonwoven fabric side of the breathable multilayer structure facing outside, and the exothermic composition as described above is accommodated therein, and the peripheral portion of the bag body is thermally fused. Obtained by wearing. For heat fusion, for example, a heat sealer such as a heating bar or a heated roll sealer, an impulse sealer, a high frequency sealer, or an ultrasonic sealer is usually used. Generally, when the sticking means of the sticking surface is an adhesive or a hot compress, the entire surface or a part thereof is covered with a release sheet. The manufactured heating device is stored in a substantially airtight outer bag and stored until use.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to this.

Example 1
A spunlace nonwoven fabric with a basis weight of 40 g / m ² was obtained by a water jet method using a card web formed of polyester short fibers (2.0 dtex, 53 mm length). This nonwoven fabric has an official moisture content of 0.4%, a dimensional change rate at 50 ° C. relative to the vertical size at 20 ° C. (hereinafter simply referred to as “dimensional change rate”) of −0.5%, and a horizontal dimension. The rate of change was 0%.

A polyethylene porous film (50 μm, dimensional change rate in the vertical direction: −1.1%, dimensional change rate in the horizontal direction: 0%) is bonded to the nonwoven fabric by a curtain spray method (polyolefin adhesive MP-841). ; Japan SSC) to obtain a breathable multilayer structure. The lateral dimensional change rate of this breathable multilayer structure was + 0.5%, and the compression energy was 0.18 gfcm / cm ² . An adhesive of acrylic solvent-based two-component curable resin (main agent: BPS5213KOP, curing agent: BHS8515; manufactured by Toyo Ink Co., Ltd.) is applied to the multilayer structure and a non-breathable polyethylene film (80 μm), The film covered with release paper is overlapped so that the nonwoven fabric and release paper are outside, respectively, and the three sides of the periphery are heat-sealed with a width of 5 mm to obtain a flat bag (70 mm × 200 mm) It was. The bag thus obtained was filled with 20 g of an exothermic composition comprising 61.6 wt% iron powder, 5.3 wt% activated carbon, 9.5 wt% vermiculite, 3.1 wt% sodium chloride, and 20.5 wt% water. Then, the remaining one side was heat-sealed to produce a heating element (heating tool). This was sealed in an outer bag of a non-breathable bag and stored until use ("Paste Cairo A").

Example 2
A card web formed by using 85% by weight of polyester short fibers (2.0 dtx, 53 mm length) and 15% by weight of rayon short fibers (1.2 dtx, 53 mm length) instead of the spunlace nonwoven fabric obtained in Example 1 Except that a spunlace nonwoven fabric having a basis weight of 40 g / m ² manufactured in the same manner as in Example 1 was used, “Paste Cairo B” was obtained in the same manner as in Example 1.

Comparative Example 1
In place of the spunlace nonwoven fabric obtained in Example 1, a commercially available product of polypropylene-based spunbond (weight per unit area: 40 g / m ² ) was used in the same manner as in Example 1 except that “Paste Cairo C” was used. Obtained.

Comparative Example 2
In place of the spunlace nonwoven fabric obtained in Example 1, a commercially available polyester-based spunbond nonwoven fabric (weight per unit area: 40 g / m ² ) was used in the same manner as in Example 1, except that “Paste Cairo D”. Got.

Comparative Example 3
In place of the spun lace nonwoven fabric obtained in Example 1, a nylon spunbond nonwoven fabric having a basis weight of 40 g / m ² was used, and “Paste Cairo E” was obtained in the same manner as in Example 1.

Comparative Example 4
Cairo F to be applied was obtained in the same manner as in Example 1 except that a rayon spunlace nonwoven fabric having a basis weight of 40 g / m ² was used instead of the polyester spunlace nonwoven fabric obtained in Example 1.

Test Example Cairo A to F to be applied obtained in Examples 1 and 2 and Comparative Examples 1 to 4 were tested by the following method.
<Test 1>
Remove the body warmers (A to F) from the outer bag, place the warmer on the 34 ° C vinyl chloride hot platen (the device in which the hot plate circulates in hot water), the ventilation surface up (air side), The material surface was set down (on the hot platen side), and after 30 minutes, the warpage was measured. The magnitude of warpage was expressed as the length (cm) of the maximum height of warpage from below.
<Test 2>
Cairo (A to F) was taken out from the outer bag and applied to the clothes on the back around the waist of the human body, and the warp at the periphery of the warmer after 1 hour was observed. The degree of warpage was evaluated according to the criteria of ○: not warped, Δ: slightly warped, x: warped greatly.

  The results are shown in Table 1. Note that the dimensional change rate and compression energy were separately measured by the above-described methods before the body was manufactured. Moreover, the average official moisture content of the nonwoven fabric itself used for these warmers was also shown for reference.

Claims (4)

An exothermic composition that includes a breathable multilayer structure obtained by laminating a non-woven fabric and a porous film on one side, and is a pasting side having a pasting means on the other side, containing water and generating heat in the presence of air In which the air-permeable multilayer structure has a positive dimensional change rate at 50 ° C. with respect to the size at 20 ° C., and 0.15 gfcm / cm ² or more. A bag for containing a heat generating composition, characterized by having a compression energy of   The exothermic composition accommodation bag according to claim 1, wherein the nonwoven fabric is manufactured by a water jet method.   A heating tool characterized in that the exothermic composition-containing bag according to claim 1 or 2 contains an exothermic composition that generates heat in the presence of air.   The heating tool according to claim 3, which is housed in an airtight outer bag.