JP2002209926A - Pocket heater wrapping material and pocket heater bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pocket heater wrapping material having superior feeling and covering property, and to provide a pocket heater bag formed by using the wrapping material. SOLUTION: This pocket heater wrapping material is composed of a laminate of a nonwoven fabric layer composed of a synthetic resin fiber, and a film layer of a thermoplastic resin, the nonwoven fabric layer composed of the synthetic resin fiber has its METSUKE amount of from 20 g/m2 or more to 50 g/m2 or less, and the laminate has the light ray transmission of 75% or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warmer packaging material comprising a laminate of a nonwoven fabric layer made of synthetic resin fibers and a film layer made of a thermoplastic resin, and a warmer bag having the same.

[0002]

2. Description of the Related Art A so-called warmer, which is manufactured by storing an iron powder that generates heat by reacting with oxygen and water in the air, is used in various scenes such as outdoors because of its simplicity. Generally, such a bag for a warmer is a packaging material in which a nonwoven fabric layer and a resin film layer are laminated,
So that the resin film layer side is the inner side of the bag body,
It is manufactured by heat-sealing the outer peripheral portion of the packaging material.

[0003] Such a non-woven fabric layer firstly comes into direct contact with the skin of the user, so that it has good touch, secondly it has sufficient strength so that it does not tear, and thirdly it has heat resistance. There is a demand for performance such as that there is. On the other hand, as the resin film layer, first, high heat-fusibility (high heat-sealing properties), second, the heat-fused portion is difficult to peel off (high hot-tack properties), and third, production speed In order to contribute to the improvement, it is required that the heat sealing temperature can be lowered (low-temperature sealing property), fourthly, sufficient strength so as not to be broken, fifthly, heat resistance.

[0004] Therefore, in general, in order to further improve the feeling of such a packaging material, nylon or polyester is used as a nonwoven fabric layer, and a low-density polyethylene film and ethylene-vinyl acetate copolymer are used as a resin film layer. A coalesced film or a low-density polyethylene film and EMMA (ethylene-methacrylic acid copolymer resin) were used. On the other hand, for the purpose of improving the heat sealing property and the hot tack property and suppressing the cost, a packaging material for a warmer in which a polypropylene spunbonded nonwoven fabric layer and a thermoplastic film layer are laminated is also known (Japanese Unexamined Patent Publication No. Hei 11 (1999)).
-56894).

[0005]

However, although the packaging material manufactured in this manner has an effect of enhancing the feel (feel) of touch, it has a drawback of poor concealment, and is therefore stored inside the cairo. There is a problem that the user who dislikes seeing the iron powder or the like cannot be satisfied.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a warmer packaging material having excellent texture and concealability, and a warmer bag using the same.

[0007]

The warming material for a warmer according to the present invention is a warming material for a warmer consisting of a laminate of a nonwoven fabric layer made of synthetic resin fibers and a film layer made of a thermoplastic resin. The nonwoven fabric layer made of synthetic resin fibers has a basis weight of 15 g / m ² or more and 70 g / m ² or less, and the laminate has a light transmittance of 75% or less. Things. More preferably, the basis weight of the nonwoven fabric is 20 g / m ² or more and 50 g / m ² or less, and the light transmittance of the laminate is 70% or less.

[0008] Cairo is used in contact with the skin
So, Cairo users are soft against Cairo packaging
Prefer texture. However, the basis weight of the nonwoven fabric is 70
g / m ^TwoIf it exceeds, the touch becomes hard and enough
Cannot provide texture. On the other hand, 15 g / m^TwoLess than
Has insufficient strength as a non-woven fabric,
The drawback is that it is not possible to secure sufficient strength and it is easy to tear
It is said that the texture after lamination is not good
There are drawbacks.

When the light transmittance of the laminate is 75% or more, iron powder and the like stored in the inside of the packaging material made of such a laminate are easily seen from the outside of the packaging material. Therefore, the design is inferior. For this reason, there is a drawback that a user who dislikes seeing iron powder or the like inside cannot be sufficiently satisfied.

[0010] As described above, according to the present invention, the texture and concealment of the packaging material for the body warmer can be improved, so that the users of the body warmer can be sufficiently satisfied. By using such a warmer packaging material, a warmer bag having a good texture and concealing properties can be produced.

[0011] The total light transmittance of the laminate is measured by a "direct reading haze computer HGM-2DP" manufactured by Suga Test Instruments Co., Ltd.
Is measured using Although the number of sheets to be measured of the laminate can be selected as appropriate, it is preferable that the layers be measured in an overlapped manner because of relatively unevenness. For example, the aperture is set to a minimum value, and the measurement is performed by stacking two laminates as the object to be measured. The result obtained by such a measurement is the total light transmittance of the two layers. The total light transmittance shown in the present invention indicates the value of the square root of the total light transmittance of the two sheets stacked. Therefore, in the present invention, the total light transmittance is preferably 75% or less, and more preferably 70% or less.
0.56, which is the square of 0.7, and 0.06, which is the square of 0.7.
It will show a value of 49. That is, the total light transmittance of the two sheets is preferably 56% or less, and more preferably 49% or less.

The nonwoven fabric used as the nonwoven fabric layer is not particularly limited, and nonwoven fabrics manufactured by various manufacturing methods can be used. For example, known nonwoven fabrics such as spunbonded nonwoven fabric, spunlace nonwoven fabric, hot-air guard nonwoven fabric, hot embossed guard nonwoven fabric, and melt blown nonwoven fabric can be used. Among them, a spunbond nonwoven fabric which is a long fiber is preferable from the viewpoint of strength, productivity and the like. In addition, for example,
A composite nonwoven fabric that combines the spun bond method and the melt blow method may be employed.

Such a spunbonded nonwoven fabric may be manufactured by a predetermined manufacturing method, and is generally manufactured through the steps of spinning, drawing, opening, collecting, and bonding. Further, in the bonding process, the nonwoven web is generally partially fused. Partial fusion refers to joining nonwoven webs together by heat fusion or the like, instead of joining the front surfaces, but partially. For the partial fusion, for example, a method using an embossing roll having dots (points), broken lines, lattice-like and checkerboard-like convex portions can be adopted.

In the present invention, a more optimal spunbonded nonwoven fabric is, for example, one that has been partially fused by the method described above, and the area ratio of the fused portion is more preferably 10 to 30%, more preferably. Is 12 to 20%. If the area ratio of the fused portion is less than 10% of the whole, the texture is improved, but the fluff is likely to occur, and the fibers are liable to fall off. On the other hand, if the area ratio of the fused portion exceeds 30% of the whole, the touch becomes hard and the texture is impaired.

Examples of the synthetic resin used for the nonwoven fabric include polyester resins, polyamide resins, and polyolefin resins. Among these, polyolefin-based resins are preferred because they are inexpensive and have excellent texture.
Examples of the polyolefin resin include polypropylene and polyethylene as homopolymers, and ethylene-α-olefin copolymers and propylene-α-
An olefin copolymer or the like can be employed. Examples of the copolymer include linear low-density polyethylene (LLDPE) and high-pressure LDPE.

In particular, among the polyolefin resins, a polypropylene resin which is more excellent in mechanical suitability and heat resistance is preferable.

The synthetic resins other than the polyolefin resin include polyester resins and polyamide resins. Examples of the polyester-based resin include homopolyesters such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polynaphthalene terephthalate, and copolyesters obtained by copolymerizing other components with these as a main component unit, and further, a mixed polyester thereof. Can be mentioned.

As the polyamide resin, nylon 6
(Polycaprolactamide), nylon 6,6 (polyhexamethylene adipamide), nylon 6,10 (polyhexamethylene sebacamide), nylon 11 (polyundecaneamide), nylon 7 (poly-ω-aminoheptane) Acid), nylon 9 (poly-ω-aminononanoic acid), nylon 12 (polylaurinamide) and the like. Among them, nylon 6, nylon 6,6 are preferably used.

Although the fiber diameter of the synthetic resin used for the nonwoven fabric is not particularly limited, the smaller the fiber diameter is, the better the concealing property is. However, if the fiber diameter is too small, the strength of the nonwoven fabric is reduced. For example, it is preferably 1 to 50 μm, and 5 to 40 μm.
μm is more preferred. In addition, as a nonwoven fabric, the fiber diameter is 1
A non-woven fabric layer made of fibers of 0 μm or more, and a fiber diameter of 10 μ
Alternatively, a laminate obtained by laminating a nonwoven fabric layer made of fibers of m or less may be used.

The cross-sectional shape of the fiber is not particularly limited, but the use of a modified cross-sectional fiber having a modified cross-sectional shape of the fiber can further improve the concealing property. Furthermore, the surface of the fiber may be formed in a so-called rough or shark skin shape, and in such a case, the concealing property can be improved.

The synthetic resin used for the nonwoven fabric includes
For example, an additive such as a pigment may be contained, and in particular, it is preferable that a pigment is contained in a polyolefin-based resin, especially a polypropylene-based resin.

Such pigments are not particularly limited, and inorganic and organic pigments can be used. Specifically, as inorganic pigments, oxides such as titanium oxide, sulfides, ferrocyanides, chromates, sulfates, carbonates, silicates, carbons such as carbon black, metal powders, pearl pigments and the like. Can be used.

On the other hand, organic pigments include azo (insoluble, soluble) compounds, condensed azo compounds, phthalocyanine compounds, anthoraquinone compounds, indigo compounds, perylene compounds, dioxazine compounds, quinacridone compounds, isoindone compounds, and the like. Linone compounds, quinophthalone compounds, pyrrole compounds, metal complex salts, fluorescent pigments and the like can be used. The kind and amount of such a pigment are appropriately selected in consideration of the hiding factor, production stability as a nonwoven fabric, color, and the like. The amount of such a pigment is generally used at 10% by weight or less.

On the other hand, the thermoplastic resin constituting the thermoplastic resin film layer is not particularly limited. For example, a commonly used ethylene-vinyl acetate copolymer resin or ethylene-methacrylic acid copolymer resin is used. Polymer resins and the like can be used. However, those excellent in heat sealability, hot tack property, low-temperature sealing property, strength and the like are preferable. For example, a polyolefin resin that is inexpensive and has excellent heat sealing property can be used.

Further, as the polyolefin resin,
Various polyethylene and polypropylene can be adopted,
Among them, linear low-density polyethylene (LLDPE) is preferable in consideration of low-temperature sealing properties and the like. Such a thermoplastic resin film layer is abutted to each other, and the abutted portion is heat-fused by applying heat or the like from the outside to form a bag or the like. The film layer made of a thermoplastic resin may be a single layer of the film layer or a multilayer including the film layer. In this case, it is sufficient that the thermoplastic resin film layers are heat-sealed to each other.

In addition, linear low-density polyethylene (LLD)
PE) may be produced using a metallocene-based catalyst. Examples of the metallocene catalyst include a single site catalyst (SSC) and a geometrically constrained catalyst (CG).
C). Specific examples of these metallocene catalysts are described in JP-A-6-192506 and JP-A-7-145.
298, 7-18151, 7-145
No. 272, WO94 / 06859 and catalysts described in JP-A-5-436.
No. 18, No. 5-51414, International Publication WO9
The catalysts described in JP-A-6 / 04317, JP-A-93 / 13140, JP-A-91 / 04255 and JP-A-91 / 04257 can be mentioned.

More specifically, there is a catalyst comprising a transition metal complex having a cyclopentadienyl group, a mono (di, tri, tetra, penta) methylcyclopentadienyl group or an indenyl group. These metallocene-based catalysts,
Usually, an alkylaluminoxane or an ionic compound such as a boron compound is used in combination. An ethylene-α-olefin copolymer having 4 to 18 carbon atoms is preferred.

In linear low-density polyethylene, a C 4 to C 18 usually used as a comonomer of a copolymer
Examples of the α-olefin include linear α-olefins such as butene-1, pentene-1, hexene-1, octene-1, nonene-1, decene-1, and dodecene-1;
Examples include branched α-olefins such as 3-methylbutene-1 and 4-methylpentene-1.
Particularly, a linear α-olefin having 4 to 10 carbon atoms is preferable.

These α-olefins may be used alone or in combination of two or more. Further, a small amount of a diene component, for example, dicyclopentadiene; ethylidene norbornene; 1,4-hexadiene; 1,9-decadiene; vinyl norbornene may be used in combination.
The content of the α-olefin unit in the ethylene-α-olefin copolymer is not particularly limited, and may be appropriately selected depending on the purpose.

A resin containing a linear low-density polyethylene produced using such a metallocene-based catalyst is as follows:
Those having a melting point of 70 to 120 ° C are suitable. The temperature is more preferably 85 to 110 ° C. In a warmer bag using the warmer packaging material having such a configuration, it is necessary that a film layer made of a resin containing linear low-density polyethylene is laminated as a heat-sealing layer during bag making. . In this case, since the heat sealability is improved,
The melting point of the resin containing the linear low-density polyethylene is preferably as low as possible, but at less than 70 ° C., the seal interface is melted and peeled off due to the heat generated by the exothermic composition filled in the warmer,
There is a risk of breaking the bag. If the temperature is higher than 120 ° C.,
The difference from the melting point of the polypropylene resin used for the nonwoven fabric layer becomes small, and the heat sealability may be deteriorated, for example, the nonwoven fabric layer may be deformed, or the stability during high-speed bag-making sealing may be reduced.

The film layer serves as a heat-sealing layer at the time of bag-making. If the melting point satisfies the above range, only linear low-density polyethylene obtained using a metallocene catalyst can be used. And may include linear low-density polyethylene, low-density polyethylene, or the like obtained by another manufacturing method. That is, a material obtained by blending these other resins with a linear low-density polyethylene obtained using a metallocene catalyst may be used as the material of the film layer. Preferably, only a linear low-density polyethylene obtained using a metallocene catalyst is used.

Further, the film layer made of a thermoplastic resin is
It may be a single layer of the above-mentioned film layer made of a resin containing a linear low-density polyethylene produced using a metallocene catalyst, or a multi-layer in which another thermoplastic resin is laminated on this layer. However, in the case of a multilayer structure, the film layer made of a resin containing a linear low-density polyethylene produced using a metallocene-based catalyst serves as a seal layer to be heat-sealed when making a bag. It is necessary to be.
Further, in the case of a multilayer structure, a two-layer structure composed of a linear low-density polyethylene resin film layer and a low-density polyethylene resin film layer produced using a metallocene catalyst is preferably used.

The thickness of the thermoplastic resin film layer is preferably 30 to 80 μm, more preferably 40 to 60 μm.
Is more preferred. If it is less than 30 μm, sufficient piercing strength cannot be obtained, and if it exceeds 80 μm, the heat-fusibility decreases, and high-speed production becomes difficult.

Further, the material for forming the film layer includes:
A third component such as various additives may be added as long as the object of the present invention is not impaired. For example, when air permeability is required for a film for a warmer or the like, a microporous film obtained by adding calcium carbonate to a polyolefin-based resin and stretching the film may be used as the film layer.

Further, the above-mentioned various pigments may be added to the material of the film layer in the same manner as in the case of the above-mentioned non-woven fabric layer. It is appropriately selected in consideration of production stability, color, and the like. The amount of these pigments added is generally 1
Used at 0% by weight or less.

Further, the film layer may be subjected to surface embossing, or the crystallinity may be adjusted by adding a nucleating agent to the material of the film layer, or by stretching the film layer. Can also reduce the light transmittance.

The method for laminating the nonwoven fabric layer and the film layer is not particularly limited, and a known method may be used. For example, extrusion lamination to melt-extrude a linear low-density polyethylene produced using a metallocene-based catalyst on a nonwoven fabric, or a resin layer of low-density polyethylene or the like, produced using a nonwoven fabric and a metallocene-based catalyst A polysand laminate in which linear low-density polyethylene is laminated, a dry laminate using a fusing agent, or the like can be used. Furthermore, in high-speed production, tandem molding using two T-die extruders is preferably used.

In the disposable body warmer, oxygen is required to generate heat from the exothermic composition, so that the packaging material for the body warmer comprising the above-mentioned laminate is provided with air permeability. Therefore, a known method such as mechanical perforation using a fine needle or the like can be employed. In that case, the diameter and the number of holes may be appropriately selected according to the purpose.

The bag for a warmer of the present invention comprises the above-mentioned warming material for a warmer, and the film layer made of a resin containing a linear low-density polyethylene in the warming material for a warmer is used for producing the warmer. Is obtained by thermal fusion. The bag-making method is not particularly limited, and a known method may be used.Specifically, the bag-forming material is used so that the film layers made of a resin containing linear low-density polyethylene directly overlap. A method in which two sheets are stacked and four sides are heat-sealed by a heat sealing machine to form a bag shape is preferably used. In addition, it is not limited to four sides, for example,
Other things such as three-way may be used.

[0040]

The present invention will be described in detail below with reference to examples and comparative examples. Note that the present invention is not limited to the contents described below. (Nonwoven fabric constituting nonwoven fabric layer) Spunbond (PPSB) nonwoven fabric made of polypropylene (A) Stratec RN series, manufactured by Idemitsu Unitech Co., Ltd. (A1) Product number RN2030 Weight per unit area 30 g / m ² , Color: natural weight per unit area of 40g / m ^2, tint; natural (A3) part No. RN2050 basis weight of 50g / m ^2, tint; natural (A4) part No. RN2070 basis weight of 70g / m ^2, tint; natural (B) Stra Tech RW series, Idemitsu Unitech Co., Ltd. (B1) Part No. RW2030 Weight 30g / m ² , tint; white (B2) Part No. RW2040 Weight 40g / m ² , tint; white (B3) Part No. RW2050 Weight 50g / m ² , tint: White (B4 ) Part number RW270 Weight 70g m ^2, tint; white (C) Stra Tech RC series, Idemitsu Unitech Co., Ltd. (C1) Part No. RC2040 weight per unit area of 40g / m ^2, shades: Beige (C2) Part No. RC2040 weight per unit area of 40g / m ^2, tint; Blue ( (The thermoplastic resin constituting the film layer) Linear low-density polyethylene (LLDPE) (D) Affinity FW1650, melting point 98 ° C., manufactured by Dow Chemical Company (E) The aforementioned linear low-density polyethylene (affinity FW1650, melting point 98) C., Dow Chemical Co., Ltd.) and 10% of white pigment masterbatch (PEX68T, manufactured by Tokyo Ink Co., Ltd.)

[Example 1] (B2) Product number R as nonwoven fabric layer
Using W2040 and (D) Affinity FW1650 as the resin of the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Example 2] (B3) Product number R as nonwoven fabric layer
Using W2050 and (D) Affinity FW1650 as a resin for the film layer, a packaging material for a warmer in which the nonwoven fabric layer and the film layer were laminated in two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

Example 3 As the nonwoven fabric layer, (C1) product number R
Using C2040, color; beige, and using (D) Affinity FW1650 as the resin for the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

Example 4 (C2) Product Number R as Nonwoven Fabric Layer
Using C2040, color: blue, and using (D) Affinity FW1650 as a resin for the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

Example 5 As the nonwoven fabric layer, (B2) product number R
Using W2040, 10% of a white pigment masterbatch (PEX68T, manufactured by Tokyo Ink Co., Ltd.) is used as the resin of the film layer with respect to (E) Affinity FW1650.
Using the added material, there was obtained a packaging material for a warmer comprising a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Comparative Example 1] (A1) Product number R as nonwoven fabric layer
Using N2030 and (D) Affinity FW1650 as the resin of the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Comparative Example 2] As the nonwoven fabric layer, (A2) product number R
Using N2040 and (D) Affinity FW1650 as the resin for the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Comparative Example 3] (A3) Product number R as nonwoven fabric layer
Using N2050 and (D) Affinity FW1650 as the resin of the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Comparative Example 4] (A4) Product number R as nonwoven fabric layer
Using N2070 and (D) Affinity FW1650 as the resin of the film layer, a packaging material for a warmer comprising a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Comparative Example 5] (B1) Product number R as nonwoven fabric layer
Using W2030 and (D) Affinity FW1650 as the resin of the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

[Comparative Example 6] (B4) Product number R as nonwoven fabric layer
Using W2070 and using (D) Affinity FW1650 as the resin for the film layer, a packaging material for a warmer consisting of a laminate obtained by laminating the nonwoven fabric layer and the film layer into two layers was obtained. Furthermore, a Cairo sample was prepared using this Cairo packaging material.

(Preparation Method of Cairo Packaging Material) Cairo packaging materials of each of Examples and Comparative Examples were prepared by using nonwoven fabrics ((A1) to (A1)).
(A4), (B1) to (B4), (C1), (C2))
The resin ((D), (E)) of the film layer was put on top using a T-die extruder (extrusion temperature 270 ° C.) to a thickness of 50 μm.
By extrusion lamination. As described above, a packaging material for a warmer composed of a laminate of two layers of air-impermeable material was produced.

(Cairo Sample Preparation Method) Using the cairo packaging material prepared as described above, a cairo sample was prepared by the following method. First, in order to cause heat generation (oxidation reaction) of the exothermic composition to be filled therein, a part of a non-breathable body packing material for a warm body is subjected to a breathing process using a hot needle to form a laminate of two breathable layers. A packaging material for body warmer was prepared. These non-breathable warmer wrapping material and breathable warmer wrapping material are supplied as a raw material in such a manner that the film layers made of linear low-density polyethylene are in contact with each other, and are supplied as a hot roll type filling seal. Exothermic composition (iron powder,
While filling with water, an oxidation promoter, a water retention agent, etc.), the four sides were sealed to prepare a warmer sample.

At this time, the lower limit sealing temperature was 112 ° C., but as for the bag making evaluation at the time of filling the contents, defective products due to insufficient sealing strength occurred at 110 ° C. and 120 ° C., but 130 ° C. In the above, a defective product was not generated and a good product could be obtained.

With respect to the packaging materials for the body warmers obtained in the above Examples and Comparative Examples, the total amount of transmitted light of the two sheets was measured. Further, with respect to each of the warming samples prepared using each of these warming materials for the warming, the characteristics of the concealing property and the texture were evaluated. Table 1 summarizes these measurement results and evaluation results.

[0056]

[Table 1]

The measurement and evaluation of each of these items were performed using the following methods. (1) Calculation of Total Light Transmittance of Cairo Packaging Material Each of the above-mentioned Cairo packaging materials was measured for the total light transmittance of a two-layer stack according to the following measurement method. (Measurement method) Measuring machine: Direct reading haze computer HGM-2DP manufactured by Suga Test Instruments Co., Ltd. Measuring condition: Set the aperture to a minimum value. DUT: A stack of two packaging materials for each body warmer is used. The square root of the total light transmittance of the two sheets thus obtained was determined, and the total light transmittance was calculated.

(2) Evaluation of masking property and hand-feeling of the warming sample The hand-feeling and masking property of each of the above warm-up samples were evaluated by performing a monitor test using a panel of 20 persons. As for the texture, the feeling of rubbing and the like were evaluated as compared with general commercial products (A: equivalent or better than general commercial products, ：: equivalent, X: inferior). Further, the concealability was evaluated by a visual image as compared with a general commercial product (A: equivalent or higher than general commercial product, ○: equivalent, X: inferior).

As shown in Table 1, it can be seen that the warming materials and warming samples obtained in Examples 1 to 5 are excellent in concealing properties and feeling. In Example 1, although the effect of the concealing property can be achieved, the texture is equivalent to that of the commercially available product, but tends to be slightly inferior. Therefore, the value of the total light transmittance at that time, 75%, is It can be seen that this is the limit value that can achieve such an effect of the concealment.

Further, in Example 2, although the effect can be achieved in terms of the hand, it tends to be equivalent to the commercial product but slightly inferior in terms of the concealing property. It can be seen that the value of 50 g / m ² is the limit value at which such a feeling effect can be achieved. In particular, in Examples 3 to 5, the basis weight of each nonwoven fabric layer was 40 g / m ² and the value of the total light transmittance was 7%.
0% or less, which indicates that the concealing properties and the hand are sufficiently excellent.

On the other hand, Comparative Examples 1 to 3 and Comparative Example 5
, The basis weight of each nonwoven fabric layer is 50 g / m ² or less, which is excellent in texture. However, the total light transmittance exceeds 75%, which indicates that the opacity is poor.

In Comparative Example 6, the total light transmittance was 67%, and the opaqueness was excellent. However,
The basis weight of the nonwoven fabric layer is 70 g / m ² , which indicates that the texture is inferior. Further, in Comparative Example 4, the total light transmittance was 67%, and the opacity was excellent. However, the basis weight of the nonwoven fabric layer is 70 g / m ² , which indicates that the texture is inferior. In addition,
In each of Examples and Comparative Examples, when the basis weight of the nonwoven fabric is less than 20 g / m ² , the strength of the nonwoven fabric is insufficient.
g / m ² ) is the lower limit of the basis weight.

[0063]

As described above, according to the packaging material for a warmer of the present invention, the basis weight of the nonwoven fabric layer is 20 g / m ² or more.
A material having a weight of 0 g / m ² or less is employed, and the light transmittance of the laminate of the nonwoven fabric layer and the film layer is 75% or less. For this reason, Cairo users can be sufficiently satisfied. In addition, the warmer bag according to the present invention using such a warmer packaging material can also secure sufficient texture and concealment.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C099 AA01 GA03 JA04 LA05 4F100 AK01A AK01B AK03A AK07A BA02 DG15A GB15 GB66 GB71 JB16B JN02 JN08 YY00 YY00A

Claims (5)

[Claims] 1. A nonwoven fabric layer made of synthetic resin fibers,
A heating element for a body warmer comprising a laminate with a film layer made of a thermoplastic resin, wherein the nonwoven fabric layer made of synthetic resin fibers has a basis weight of 15 g / m ² or more and 70 g / m ² or less, The packaging material for a warmer, wherein the laminate has a light transmittance of 75% or less. 2. The packaging material for a warmer according to claim 1, wherein the nonwoven fabric layer has a basis weight of 20 g / m ² or more and 50 g.
/ M ² or less, and the laminate has a light transmittance of 70% or less. 3. The packing material according to claim 1, wherein the synthetic resin is a polyolefin-based resin. 4. The packaging material for a warmer according to claim 3, wherein the polyolefin resin is a polypropylene-based resin. 5. A warmer bag comprising the warmer packaging material according to any one of claims 1 to 4.