JP2010075683A - Packaging material of bag for accommodating exothermic compound and heating material using packaging material - Google Patents

Abstract

Even when the temperature of a thermal material increases due to heat generation, the adhesiveness of the heat-generating composition-containing bag to the human body does not decrease, and the packaging material for the bag for storing the heat-generating composition that can be used comfortably, particularly The present invention provides a packaging material that is in close contact with the body during use and has sufficient softness, which is suitable for use as a packaging material for a pasting surface, a heat generating composition storage bag, and a thermal material for pasting.
A laminate comprising (A) a single layer or a laminate film having an elastomer layer selected from the group consisting of natural rubber, synthetic rubber, thermoplastic elastomer, and a mixture thereof and polyolefin, and (B) a nonwoven fabric. A bag for containing a heat-generating composition, comprising a sheet, the monolayer or laminated film having the elastomer layer (A) and the nonwoven fabric (B) being extruded and laminated with a nip roll having irregularities. A packaging material for affixing surfaces, a bag for containing a heat-generating composition using these packaging materials, and a thermal material.
[Selection figure] None

Description

  The present invention relates to a packaging material for an exothermic composition accommodation bag, an exothermic composition accommodation bag, and a thermal material using the same. More specifically, it can be freely attached to any predetermined part of the body, has good followability to the body, and contains a heat generating composition for a thermal material that is used stably and comfortably when attached to the body. The present invention relates to a packaging material for a bag, a bag for containing a heat generating composition, and a thermal material using the same.

  A thermal material including a breathable bag containing a heat generating composition that generates heat upon contact with air is generally widely used as a medical device for reducing pain due to thermal heat, a warmer for warming, and the like. In this exothermic composition housing bag, a laminated sheet including a nonwoven fabric and a porous film and / or a laminated sheet of a nonwoven fabric and a non-breathable film is generally used as a packaging material.

  Such a thermal material can be used by being attached to clothing or skin by adopting a structure having an adhesive layer on the surface. However, the exothermic composition gradually hardens with heat generation, and the packaging material is not flexible, which makes the human body uncomfortable, deteriorates the adherence of the thermal material to the human body, further peels off or drops the thermal material. There was a problem that. In order to solve these problems and improve the safety to the human body and the comfortable feeling of use, various improvements have been proposed for adhesives and non-woven fabrics on the surface of packaging materials. Yes.

  For example, a bag made of a breathable top 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, Patent Document 1), The thing which was excellent in the softness | flexibility of the texture like the thing (for example, patent document 2) etc. which have the uneven | corrugated pattern in the thickness direction around the heat insulation bag has been proposed. However, even when such a bag is used, when the thermal material is applied to clothing or skin, the peripheral portion is directed outward to the sealed peripheral portion and the heating device itself as the temperature rises due to heat generation. There existed a problem that curvature generate | occur | produced and an unpleasant sensation arises, or whenever a user moves, a thermal material peels off by contacting an upper garment.

  Therefore, the present inventors include moisture-containing air, one side of which is a breathable multilayer structure obtained by laminating a nonwoven fabric and a stretched porous film, and the other side is a pasting surface having a pasting means. A bag for containing a heat-generating composition that generates heat in the presence of water, wherein the breathable multilayer structure has a positive dimensional change rate at 50 ° C with respect to the size at 20 ° C. , And devised a bag for containing a heat generating composition, characterized in that the rate of dimensional change in the vertical direction at 50 ° C. with respect to the size at 20 ° C. is negative, and succeeded in obtaining a certain effect (patent) Reference 3).

  However, for the packaging material (also called the back substrate) on the sticking side, the strength (prevents leakage of the exothermic composition of the contents due to bag breaking) and the thermal machine manufacturing machine suitability (easy to control the tension of the packaging material) , Dimensional stability, etc.) have been prioritized, and so far, little has been studied or improved in order to solve the above problems.

JP-A-2-297362 JP-A-7-67907 Japanese Patent No. 3756925 JP 2005-160659 A JP-A-2-149272 JP 2005-287958 A

  The present invention is a packaging material for a bag for containing a heat generating composition that can be used comfortably without reducing the adhesion of the heat generating composition containing bag to the human body even when the temperature of the heat generating material is increased due to heat generation, In particular, an object of the present invention is to provide a packaging material that is in close contact with the body at the time of use and has sufficient softness, and that is suitable for use as a packaging material for affixing surface, a heat generating composition storage bag, and a thermal material for application. To do.

In order to achieve the above-mentioned problems, the present inventors have intensively studied to arrive at the present invention.
That is, the present invention
[1] (A) a single layer or laminated film having an elastomer layer selected from the group consisting of natural rubber, synthetic rubber, thermoplastic elastomer, and a mixture of these and polyolefin;
(B) It consists of a laminated sheet containing a nonwoven fabric, and the monolayer or laminated film having the elastomer layer of (A) and the nonwoven fabric of (B) are extruded and laminated with uneven nip rolls. Wrapping material for the application surface of the bag for containing the exothermic composition;
[2] The packaging material according to [1], which is substantially non-breathable;
[3] The packaging material according to [1] or [2], which has an adhesive layer on the nonwoven fabric side surface of the laminated sheet;
[4] The packaging material according to any one of [1] to [3], wherein the elastomer layer is a layer made of a thermoplastic elastomer or a mixture of a thermoplastic elastomer and a polyolefin.
[5] The packaging material according to any one of [1] to [4], wherein the nonwoven fabric is a spunlace nonwoven fabric;
[6] The packaging material according to any one of [1] to [5], wherein the drape shape area is 450 mm ² or less;
[7] The packaging material according to any one of [1] to [6], wherein the drape coefficient is 0.8 or less;
[8] A bag for containing a heat-generating composition using the packaging material according to any one of [1] to [7] on at least one side;
[9] A bag for storing a heat generating composition using the packaging material according to any one of [1] to [7] on at least a sticking surface, and a heat generating composition that generates heat in the presence of air stored in the bag. Thermal material for sticking, including:
[10] The thermal material for application according to [9], which is housed in an airtight outer bag;
[11] The method for producing a packaging material according to any one of [1] to [7], wherein the monolayer or laminated film having the elastomer layer (A) and the nonwoven fabric (B) are used. A method comprising extrusion laminating with an uneven nip roll;
[12] The method according to [11], further including a step of laminating the obtained laminated sheet with a flat roll after the step of extrusion laminating with the uneven nip roll.

The present invention has the following effects.
(1) Since the packaging material of the present invention is formed by laminating a film having an elastomer layer with a nonwoven fabric, the packaging material is flexible and easy to adhere to the body, and prevents or reduces peeling or falling off during use of the thermal material. It is possible to produce a thermal material that can supply stable heat.
(2) Since the packaging material of the present invention can be manufactured at a low cost with a simple manufacturing process, it is possible to provide an improved product at a manufacturing cost comparable to the conventional one.

  The packaging material of the present invention basically comprises a laminated sheet containing a film (A) having an elastomer layer and a nonwoven fabric (B).

Elastomer In the present invention, as the elastomer, one or more selected from natural rubber, synthetic rubber, thermoplastic elastomer, and a mixture of these with polyolefin can be used.

  Examples of synthetic rubber include butadiene rubber, 1,2-polybutadiene, isoprene rubber, styrene-butadiene rubber, styrene-butadiene-styrene copolymer, butyl rubber, acrylonitrile-butadiene rubber, chloroprene rubber, isobutylene-isoprene rubber, polyalkylene. Sulfide, silicone rubber, poly (chloro-trifluoroethylene), vinylidene fluoride-6-fluoropropylene copolymer, urethane rubber, propylene oxide rubber, epichlorohydrin rubber, acrylate-acrylonitrile copolymer, acrylate-2 -Chlorethyl vinyl ether copolymer and the like are fisted.

  Examples of thermoplastic elastomers include olefin elastomers, urethane elastomers, ester elastomers, styrene elastomers, amide elastomers, acrylic elastomers, vinyl chloride elastomers, syndiotactic poly (1,2-butadiene), poly ( Trans-1,4-isoprene), silicone elastomers, and the like.

  Examples of the olefin-based elastomer include ethylene-propylene copolymer, ethylene-propylene-diene terpolymer, chlorosulfonated polyethylene, chlorinated polyethylene, and ethylene-vinyl acetate copolymer. Among these, an ethylene-α-olefin elastomer formed using a cyclopentadienyl complex (that is, a metallocene catalyst) is particularly preferable. As the α-olefin, 1-hexene, 1-octene, 1-heptene, 4-methylpentene-1, and the like are particularly preferable.

  Examples of urethane elastomers include urethane elastomers composed of blocks having urethane bonds and polycarbonate polyols, ether polyols, polyether / polyester polyols, or caprolactone polyester blocks.

  Examples of the ester-based elastomer include an ester-based elastomer composed of a block having an aromatic polyester and a block having an aliphatic polyester or an aliphatic polyether.

  Preferred elastomers are thermoplastic elastomers, particularly styrenic elastomers such as styrene-ethylene-butylene-styrene block copolymers (SEBS).

  The elastomer as described above may be used alone or as a mixture of two or more (blends), but is suitable for film formation (ductility, malleability, fluidity, etc.) or heat during bag making. In order to improve sealing performance (hot tack, melting point, etc.), it can be used as a blend with an olefin resin. Such a blend preferably has an elastomer content of 50% by weight or more.

  The film having the elastomer layer as described above may be a single-layer elastomer film or a laminated film with other layers. For example, a laminated film of a urethane elastomer film and an olefin elastomer film, or a laminated film of a styrene elastomer such as SEBS and an olefin elastomer can be used. By making the film having an elastomer layer into a laminated film of two or more layers, the strength of the packaging material can be improved, and the properties of the packaging material surface can be modified or improved. For example, if a laminated film of an SEBS layer and an olefinic elastomer layer is used with the SEBS layer on the non-woven fabric side and the olefinic elastomer layer on the surface (outside), the slip resistance of the packaging material is improved compared to the case of the SEBS film alone. It can be made small, blocking is difficult to occur, and heat sealing performance with the air-permeable film of olefin resin is improved, so it can be stored in roll form and processed at high speed (adhesive application, thermal material Manufacturing).

As the nonwoven fabric, any conventionally used nonwoven fabric can be used. Specific examples include artificial fibers such as nylon, vinylon, polyester, rayon, acetate, acrylic, polyethylene, polypropylene, and polyvinyl chloride, and natural fibers such as cotton, hemp, and silk, but spunbond, thermal bond, and spunlace. And the like.

  The nonwoven fabric is used in the packaging material of the present invention from the viewpoints of sweat absorption when using the thermal material, reinforcement of the packaging material strength, improvement in mechanical suitability, and the like. In particular, regarding the mechanical properties, since the packaging material of the present invention uses an elastomer film, the film alone stretches in the MD direction, and it is difficult to control the tension in the extrusion process, the adhesive application process, the thermal material manufacturing process, and the like. Become. From these points, a nonwoven fabric that expands and contracts in the MD direction and the CD direction can also be used. However, a nonwoven fabric that easily stretches only in the CD direction (for example, a spunlace nonwoven fabric, particularly a semi-random method) is preferable. Moreover, as a material, nylon, polyester, rayon, etc. nonwoven fabrics are used suitably.

The basis weight of the nonwoven fabric varies depending on the specific gravity of the nonwoven fabric and the bulkiness due to the difference in the entanglement method, but generally about 10 g / m ² to about 200 g / m ² is suitable, especially about 20 g / m ² to About 100 g / m ² is preferred.

Production of Laminate Sheet A film having an elastomer layer can be formed in advance by a known method and then laminated with a nonwoven fabric by a known method such as dry lamination or hot melt lamination. It is also possible to heat-melt the elastomer by extrusion lamination and heat-bond and laminate with the nonwoven fabric during film formation. The latter method is desirable because it is easy to manufacture.

  The laminated sheet thus obtained can be substantially non-breathable. In the context of the present invention, (substantially) non-breathable means not only completely non-breathable, but also has some breathability due to pinholes produced in manufacturing, non-breathable packaging in thermal materials. It is intended to include those that have air permeability that does not hinder the use as a material. In other words, it is not what was intentionally made porous or perforated in the manufacturing process, and its breathability is such that it does not interfere with use as a non-breathable packaging material in a thermal material. Substantially) non-breathable.

A laminate nip roll can be appropriately selected by a person skilled in the art from known ones. Although a general flat roll can be used, use of an uneven roll is preferable. When a concavo-convex roll (for example, a stripe or dot shape) is used, only convex portions are bonded together, and the unbonded portion becomes play and is easily expanded and contracted in the CD direction.
The uneven roll may be used in combination with a flat roll. For example, when laminating with a non-woven fabric having fuzz, lamination can be performed using a nip roll having irregularities in the primary processing of extrusion lamination and using a flat roll in the secondary processing. Also, in the case of tandem unevenness, pinholes generated in the concavo-convex nip roll are prevented or repaired by laminating using the concavo-convex roll in the first extruding process and using the flat roll in the second extruding process. You can also By combining with a flat roll, even when a pinhole is generated due to the use of an uneven roll, the pinhole is repaired, so that good temperature stability of the thermal material can be secured.
When a laminated film is used as a film having an elastomer layer, the elastomer layer can be extruded and laminated between a film formed in advance and a nonwoven fabric. By doing so, it is possible to prevent pinholes in a single process.

Adhesive layer The packaging material of the present invention can be provided with an adhesive layer on the nonwoven fabric side. The pressure-sensitive adhesive can be used as long as it can be applied to the human body, but is preferably one that is generally used for attaching a thermal material. In particular, a hot-melt pressure-sensitive adhesive that does not require a drying apparatus for moisture and solvent after lamination, has a compact facility, and can be easily used for manufacturing a packaging material at low cost is preferable.

  The pressure-sensitive adhesive layer can be formed by applying a pressure-sensitive adhesive on the nonwoven fabric of the packaging material by an arbitrary method. Application methods include, for example, (i) a method in which an adhesive is melted and applied to a sheet (spiral coating, roll coating, slot coating, control seam coating, bead coating, etc.), (ii) adhesion And a method in which a film of the agent is brought into contact with the sheet and then melted.

  The pressure-sensitive adhesive layer may be formed either after the packaging material is used as a heat-generating composition-containing bag and after the heat-generating composition is enclosed to form the thermal material, or before the thermal material is formed. In the latter case, for example, a pressure-sensitive adhesive is preliminarily applied on the packaging material containing the heat-generating composition to form a pressure-sensitive adhesive layer, which is then heat-sealed with a filling machine as described later to form a bag, and heat is generated there. A thermal material can be formed by filling the composition. Moreover, after apply | coating an adhesive beforehand on mold release materials, such as a release paper or another film, this can be pressure-bonded-transferred on a base material sheet (laminated sheet), and an adhesive layer can also be provided. The pressure-sensitive adhesive layer may be provided on the entire surface of the nonwoven fabric or may be provided partially.

Heating material The heating material of the present invention is basically composed of a bag for containing a heat-generating composition formed of a packaging material and a heat-generating composition contained therein, and at least one surface (sticking surface) of the bag for storing a heat-generating composition. ) Is provided with the packaging material of the present invention. The thermal material of the present invention may include any additional element in addition to the above configuration.

  At least one surface (breathable surface) of the exothermic composition housing bag is composed of a breathable film (or sheet). As the breathable film, a single layer or multilayer porous film (particularly, a stretched porous film) is generally used, and a laminate film of a porous film or the like and a nonwoven fabric is also preferably used. Examples of the resin constituting the porous film include polyethylene, polypropylene, and polyfluorinated ethylene. Of these, polyethylene (PE) is preferable, and linear low density polyethylene (LLDPE) is more preferable from the viewpoint of processability and the like. These can be used alone or in combination.

  The wrapping material constituting the ventilation surface may be a non-porous non-breathable film having holes with appropriate pore diameters, and the wrapping material of the present invention is perforated so as to form the ventilation surface and / or You may use for a sticking surface.

  Any exothermic composition may be used as long as it generates heat upon contact with air. Generally, a known material in which an auxiliary agent such as a salt solution, activated carbon, a water-absorbing resin and / or vermiculite is added to a main agent such as iron powder is used.

  The thermal material of this invention can be manufactured as follows, for example. The packaging material constituting the affixing surface (the packaging material of the present invention) and the packaging material constituting the ventilation surface are each cut into a predetermined shape such as a rectangle having the same size (for example, 10 to 20 cm in length and 5 to 10 cm in width). An adhesive layer is provided by pressure-transferring an adhesive applied to a release film prepared in advance onto the cut non-woven fabric of the pasting surface side packaging material. Next, the adhesive layer side packaging material is overlapped with the ventilation surface side packaging material so that the release film of the adhesive layer is on the outside (that is, the elastomer film is on the inside), and the three sides of the peripheral portion are thermocompression bonded Alternatively, the bag is obtained by sealing with means such as an adhesive. Next, the exothermic composition is put through the unsealed opening, and the opening is sealed by thermocompression bonding or the like.

  The thermal material is usually kept in a state in which the pressure-sensitive adhesive layer is covered with a release film until use, and further sealed and stored in an airtight package (outer bag). The release film (including paper) and the material and production of the outer bag are well known.

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

<Manufacturing example of packaging material>
Wrapping material A:
A packaging material comprising a polyester spunlace (PET-SL) non-woven fabric (Daiwabo Polytech, “ST-40”, 40 g / m ² ) and an SEBS film (Aron Kasei, “AR-S-4913S”, 50 μm thick). Was produced by extrusion lamination. As the extrusion nip roll, a strip shape having a recess of 3 mm width and a protrusion of 3 mm width was used. Only the convex part was adhere | attached with the nonwoven fabric, and the obtained packaging material was a highly elastic thing by presence of the clearance part which arose in the recessed part.

Packaging material B:
Polyester spunlace nonwoven fabric (Daiwabo Polytech, “ST-40”, 40 g / m ² ) and SEBS (Aron Kasei, “AR-S-4913S”) 85% by weight and metallocene linear low density polyethylene (mLLDPE) A packaging material consisting of a 15% by weight blended resin film (55 μm thick) was produced by extrusion lamination. As the extrusion nip roll, a strip shape having a recess of 3 mm width and a protrusion of 3 mm width was used. Only the convex part was adhere | attached with the nonwoven fabric, and the obtained packaging material was a highly elastic thing by presence of the clearance part which arose in the recessed part.

Packaging material C:
A hot melt adhesive (Henkel Technologies Japan, “Dispomelt ME026”, 120 g / m ² ) was coated on the nonwoven fabric of the packaging material A to produce an adhesive packaging material. The hot melt pressure-sensitive adhesive application pattern had a stripe shape in which 8.5 mm wide glue portions and 8.5 mm wide paste-free portions were alternately arranged.

Packaging material D:
A hot melt pressure-sensitive adhesive (Henkel Technologies Japan, “Dermatac 34-542B”, 120 g / m ² ) was coated on the nonwoven fabric of the packaging material A to produce an adhesive packaging material. The hot melt pressure-sensitive adhesive application pattern had a stripe shape in which 8.5 mm wide glue portions and 8.5 mm wide paste-free portions were alternately arranged.

Packaging material E:
Polyester spunlace nonwoven fabric (Daiwabo Polytech, “ST-40”, 40 g / m ² ) and SEBS film (Aron Kasei, “AR-S-4913S”) produced by extrusion lamination in the same manner as the packaging material A A hot melt pressure-sensitive adhesive (“Dispomelt ME026”, 120 g / m ² ) by Henkel Technologies Japan Co., Ltd. was coated on a non-woven fabric of packaging material consisting of 70 μm thickness to produce an adhesive packaging material. The hot melt pressure-sensitive adhesive application pattern had a stripe shape in which 8.5 mm wide glue portions and 8.5 mm wide paste-free portions were alternately arranged.

Packaging material F:
On the nonwoven fabric of the packaging material B, a hot melt pressure-sensitive adhesive (Henkel Technologies Japan “Dispomelt ME026”, 120 g / m ² ) was applied to produce an adhesive packaging material. The hot melt pressure-sensitive adhesive application pattern had a stripe shape in which 8.5 mm wide glue portions and 8.5 mm wide paste-free portions were alternately arranged.

<Test Example 1>
The draping performance of various packaging materials is as follows in an environment of 20 ° C. and 65% RH in accordance with the “JISL1096 General Textile Test Method” 8.19 rigid and flexible 8.19.7G method (drape coefficient). And tested.

Five circular specimens having a diameter of 25.4 cm were collected, and a hole having a diameter of 1 cm was formed in the center of each specimen. The test piece was placed on a sample stage (12.7 cm in diameter) of a drape tester (manufactured by Daiei Scientific Instruments Co., Ltd., “Drap Tester YD-100”). At this time, assuming the followability to the human body, the surface corresponding to the skin side (nonwoven fabric side) when using the thermal material was placed facing downward to form a drape. However, in the JIS method, the drape shape area (vertical projected area of the test piece) is measured after being oscillated up and down 3 times and left for 1 minute. In this testing machine, immediately after being rotated at 1/2 rpm × 10 seconds. The drape shape area of was measured.
For each test piece, the drape coefficient was calculated by the following formula, and the average value was obtained to 3 digits after the decimal point.

Drape coefficient = Ad-S1 / S2-S1
(Ad: vertical projection area of test specimen (drape shape area) (mm ² )
S1: Area of the sample stage (diameter 12.7 cm)
S2: Area of sample (diameter 25.4 cm)
The smaller the drape shape area and drape coefficient values, the better the followability.
The results are shown in Table 1.

In the above table, the samples measured for comparison are as follows:
"Comparison 1" = pasting side packaging material of conventional thermal material (PET-SL non-woven fabric (50 g / m ² ), low density polyethylene (LDPE) film (35 µm thickness) and mLLDPE film (15 µm thickness)) (Laminated sheet)
“Comparison 2” = Conventional heating material pasting side wrapping material (laminated sheet obtained by extrusion lamination of PET-SL non-woven fabric (70 g / m ² , containing 20% polyolefin fiber) and LDPE 15 μm / LLDPE 20 μm / mL LDPE 15 μm laminated film)
“Comparison 3” = Laminated sheet obtained by dry-lamination of a conventional heating material pasting side packaging material (rayon spunlace (Ry-SL) non-woven fabric (55 g / m ² ) and MDPE 28 μm / VLDPE 12 μm laminated film) “Comparison 4” = Conventional thermal material ventilation surface side wrapping material (breathable laminated sheet obtained by dry lamination of PET-SL non-woven fabric (30 g / m ² ) and PE porous film (50 μm thickness))
“Single unit 1” = Conventional heating material side packaging film (LLDPE 23 μm / LLDPE and HDPE blend 25 μm / mLLDPE 12 μm)
“Single substance 2” = SEBS film (SEBS (Aron Kasei Co., Ltd., “AR-S-4913S”) 85 wt% and mLLDPE 15 wt% blend resin film (55 μm thickness))
“Single unit 3” = non-woven fabric (PET-SL non-woven fabric, manufactured by Daiwabo Polytech Co., Ltd., “ST-40”, 40 g / m ² )

As can be seen from Table 1, the conventional wrapping material made of laminated sheets (Comparative 1-4) has a drape shape area of about 480-520 mm ² and a drape coefficient of about 0.9-1.0. The wrapping material of the present invention had a drape shape area of 400 mm ² or less and a drape coefficient of 0.7 or less, which was almost the same as that of a single sheet. From this, it was clarified that the packaging material of the present invention has excellent flexibility comparable to a single sheet and followability to the human body even though it is a laminated sheet.

<Test Example 2>
In the same manner as in Test Example 1, the drape shape area and drape coefficient of the packaging material of the present invention having an adhesive layer were measured. The results are shown in Table 2.

In the above table, the samples measured for comparison are as follows:
"Comparison 1" = Conventional heating material adhesive side adhesive packaging material (PET-SL non-woven fabric (Shinwa Co., Ltd., 7870A-5) 70 g / m ² (containing 20% polyolefin fiber), LDPE 15 μm / LLDPE 20 μm / mL LDPE Hot melt pressure-sensitive adhesive (coated with Henkel Technologies Japan, “Dispomelt ME026” 120 g / m ² ) on a laminated sheet extruded and laminated with a 15 μm laminated film
"Comparison 2" = pasting side adhesive packaging material of conventional thermal material (PET-SL nonwoven fabric (70 g / m ² , containing 20% polyolefin fiber) and LDPE 15 μm / LLDPE 20 μm / mL LDPE 15 μm laminated film were extruded and laminated. Hot melt adhesive (coated with Henkel Technologies Japan, “Dermatack 34-542B” 200 g / m ² ) on laminated sheet
"Comparison 3" = pasting side packaging material of conventional thermal material (rayon spunlace nonwoven fabric (Shinwa Co., "7155HCD" 55g / m ² ) and MDPE28μm / VLDPE12μm laminated film) Adhesive (Coated with Henkel Technologies Japan, "Dispomelt ME026" 120g / m ² )
“Comparison 4” = Breathability obtained by dry lamination of breathable adhesive wrapping material (PET-SL nonwoven fabric (Shinwa Co., “7830A” 30 g / m ² )) and PE porous film (40 g / m ² ). Hot melt adhesive (coated with Sanyo Chemical Co., Ltd. “PS-19” 50 g / m ² ) on laminated sheet

It should be noted that the same is applied to a conventional thermal material adhesive surface side packaging film (LLDPE 48 μm / mL LDPE 20 μm) coated with 120 g / m ² of hot melt adhesive (Henkel Technologies Japan, “Dispomelt ME026”). Although it measured, all warped upwards and it was not able to measure.

As can be seen from Table 2, the conventional adhesive wrapping material using the laminated sheet has a drape shape area of about 480 to 530 mm ² and a drape coefficient of about 0.9 to 1.1. The packaging material had a drape shape area of 400 mm ² or less and a drape coefficient of 0.7 or less. Therefore, it has been clarified that the packaging material of the present invention has excellent flexibility and followability to the human body even if it is an adhesive packaging material having an adhesive layer.

<Manufacture example 2 of packaging material>
Packaging material G:
SEBS film (Aron) as an intermediate layer of polyester spunlace nonwoven fabric (Daiwabo Polytech, “ST-40”, 40 g / m ² ) and olefin elastomer film (Aichi Plastics, “LAPU film”, 35 μm thickness) A packaging material having “AR-S-4913S” (25 μm) manufactured by Kasei Co., Ltd. was produced by one-step SEBS film extrusion lamination.
As the extrusion nip roll, a strip shape having a recess of 3 mm width and a protrusion of 3 mm width was used. Only the convex part was adhere | attached with the nonwoven fabric, and the obtained packaging material was a highly elastic thing by presence of the clearance part which arose in the recessed part.

Packaging material H:
On the nonwoven fabric of the packaging material G, a hot melt adhesive (Henkel Technologies Japan (Henkel Japan), “Dispomelt ME026”, 120 g / m ² ) was applied to produce an adhesive packaging material. The hot melt pressure-sensitive adhesive application pattern had a stripe shape in which 8.5 mm wide glue portions and 8.5 mm wide paste-free portions were alternately arranged.

<Test Example 3>
In the same manner as in Test Example 1, the drape shape area and drape coefficient of the packaging materials G and H were measured. The results are shown in Table 3.

Although the wrapping materials G and H both have a drape shape area of more than 400 mm ² and a drape coefficient of more than 0.7, the wrapping materials made of conventional laminated sheets shown in Tables 1 and 2 ( It is clear that it has sufficiently superior flexibility and followability to the human body as compared to Table 1, Comparative 1-4) and an adhesive packaging material using conventional laminated sheets (Table 2, Comparative 1-4). It became.
Therefore, the packaging material of the present invention can have a drape shape area of less than 480 mm ² , preferably 450 mm ² or less, and a drape coefficient of less than 0.9, preferably 0.8 or less.

<Test Example 4>
The following property of the thermal material of the present invention to the human body was tested under the environment of 25 ° C. and 45% RH as follows.

  The thermal material was manufactured by enclosing 25 g of the exothermic composition in a bag for accommodating the exothermic composition having dimensions of 95 mm × 130 mm.

As a packaging material on the ventilation surface side, a general ventilation film A (manufactured by Nitto Lifetech Co., Ltd., Ny-SB nonwoven fabric (35 g / m ² ) and PE porous film (thickness: 70 μm) used for commercial warmers is used. Laminated with melt adhesive, air permeability 25,000 sec / 100 cc (JIS P-8117)), and improved breathable membrane B that has recently begun to be used (manufactured by Kojin Co., Ltd., polyester spunlace nonwoven fabric (30 g / m ² ) and a PE porous film (50 μm thick) obtained by dry lamination, air permeability 25,000 sec / 100 cc (JIS P-8117)) were used.

One of the following was used as the packaging surface side packaging material:
A (comparative example): A general packaging material (rayon spunlace nonwoven fabric (manufactured by Shinwa Co., “7155HCD”, 55 g / m ² ) and MDPE 28 μm / VLDPE 12 μm film dry-laminated) used in commercially available warmers, Hot melt adhesive (manufactured by Henkel Technologies Japan, “Dispomelt ME026” 120 g / m ² ) was applied.
B (Example of packaging material of the present invention): Polyester spunlace nonwoven fabric (Daiwabo, “ST-40” 40 g / m ² ) and SEBS (Aron Kasei, “AR-S-4913S” 50 μm) extruded and laminated The hot melt adhesive (manufactured by Henkel Technologies Japan, “Dispomelt ME026” 120 g / m ² ) was applied.

  In both cases, the coating pattern of the adhesive is a stripe in the long side direction of the warmer, the width of the adhesive layer is 12.5 mm wide at both ends of the warmer, and the adhesive layer and adhesive are 10 mm wide between the ends. The part which is not provided was provided alternately.

One body of the warmers prepared as described above was attached to each side of the spine of the subject's waist (skin) horizontally. The subject walked for 30 seconds at 4 km / h every 5 minutes of sitting. The time from when it was applied to when the body was peeled off and dropped from the body of the subject was measured.
The results are shown in Table 4.

  From these results, it has been found that the thermal material of the present invention has high flexibility and good followability to the human body, so that peeling and dropping are reduced, and it can be applied comfortably.

Claims (12)

(A) a single layer or laminated film having an elastomer layer selected from the group consisting of natural rubber, synthetic rubber, thermoplastic elastomer, and a mixture of these and polyolefin;
(B) a laminated sheet containing a nonwoven fabric,
The sticking surface of a bag for containing a heat-generating composition, wherein the monolayer or laminated film having the elastomer layer (A) and the nonwoven fabric (B) are extruded and laminated with a concavo-convex nip roll. Packaging material.   The packaging material according to claim 1, which is substantially non-breathable.   The packaging material of Claim 1 or 2 which has an adhesive layer on the nonwoven fabric side surface of the said lamination sheet.   The packaging material according to any one of claims 1 to 3, wherein the elastomer layer is a layer made of a thermoplastic elastomer or a mixture of a thermoplastic elastomer and a polyolefin.   The packaging material according to any one of claims 1 to 4, wherein the nonwoven fabric is a spunlace nonwoven fabric. The packaging material of any one of Claims 1-5 whose drape shape area is 450 mm < ² > or less.   The packaging material according to any one of claims 1 to 6, wherein the drape coefficient is 0.8 or less.   A bag for containing a heat generating composition, wherein the packaging material according to any one of claims 1 to 7 is used on at least one side.   A heating material comprising a bag for containing a heat generating composition using at least the packaging material according to any one of claims 1 to 7 and a heat generating composition that generates heat in the presence of air stored in the bag.   The thermal material for sticking of Claim 9 accommodated in an airtight outer bag.   It is a manufacturing method of the packaging material of any one of Claims 1-7, Comprising: The monolayer or laminated | multilayer film which has the said elastomer layer of (A), and the nonwoven fabric of said (B) are extruded with an uneven | corrugated nip roll. A method comprising the step of laminating.   The method of Claim 11 which further includes the process of laminating the obtained lamination sheet with a flat roll after the process of extruding and laminating with the said uneven | corrugated nip roll.