JP2008155976A - Packaging material used for disposable body warmer and like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel packaging material that has a flat bag body which has an air-permeable sheet on one surface and an air-impermeable sheet on the other surface, in which a functional filler is sealed, and the air permeability of which is easily controlled, and that can be easily manufactured at a low cost. <P>SOLUTION: The air-permeable sheet 3 is a laminate film made by bonding an easily peelable film 3d having a layered synthetic resin film 3c and many needle holes 3e and a porous synthetic resin film 3a with an adhesive layer 3b placed between them. The easily peelable film 3d having the layered synthetic resin film 3c and the porous synthetic resin film 3a can be easily manufactured by the existing equipment. The air permeability of the bag body 2 can be properly adjusted (for example 3,000 sec/100 cc to 35,000 sec/100 cc) by arbitrarily selecting a hole diameter and the number of the needle holes 3e. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a packaging material comprising a flat bag body, one side of which is a breathable sheet and the other side is made of a non-breathable sheet, in which a functional filler is enclosed, for example, a disposable body warmer, a moisture absorbent sheet, The present invention relates to a packaging material used as an aromatic sheet, a deodorant sheet, an insect-proof sheet, and the like.

Today, disposable warmers in which a heat-generating material containing iron powder or the like is enclosed in a flat air-permeable bag are widely used. This type of disposable body warmer is packaged in a hermetically sealed packaging bag (exterior bag) made of a non-breathable sheet, and oxygen in the air is removed when the packaging bag is torn and taken out during use. The heat generating material generates heat through the flat bag.
The flat bag body that encloses the heat generating material is usually formed into a flat bag shape by thermocompression bonding of the peripheral portions of the breathable sheet and the non-breathable sheet having substantially the same shape or between the breathable sheets.

  In such a conventional disposable body warmer, at the time of manufacture, flat bag bodies in which heating materials are sealed must be sealed one by one in a packaging bag (exterior bag), which simplifies the manufacturing process and reduces costs. There was a limit. Moreover, since the packaging bag must be torn and taken out at the time of use, it is troublesome, and since the packaging bag becomes garbage, an improvement from the viewpoint of protecting the global environment has been desired.

In order to solve such a problem, the applicant of the present invention has described that a flat bag body in which a heat generating material is sealed inside a non-breathable sheet on one side and a breathable sheet on the other side is disposed on the inside. In the air-permeable sheet, the opposite edges of the breathable sheet excluding the bent portion are joined in a peelable manner to form a sealed outer-less packaging form, A double-folded exterior-less disposable body warmer that has been formed so as to be used by peeling and unfolding the joined edges of the bag body has been proposed (see Patent Document 1).
According to this two-fold type disposable warmer, a packaging bag (exterior bag) is not required, the manufacturing can be simplified and the cost can be reduced, and it can be used easily, and the waste other than the warmer body can be greatly reduced. There are many effects.

Japanese Patent Application No. 2006-125787 Japanese Patent Application No. 2006-125788

However, regarding the above-described two-fold type disposable body warmer, the technical contents were examined in detail, and it was found that there was room for improvement in the following points.
That is, in the previously proposed two-fold type body warmer by the present applicant, a strength maintaining layer such as a nylon film is laminated on a non-peelable joining layer such as a polyethylene film as a breathable sheet, and an easy peel film is formed thereon. And a porous sheet in which many fine holes are formed in a portion other than the peripheral portion.
However, it is not easy to integrally form an air-permeable sheet having such a laminated structure by extrusion molding using existing equipment, and there is a problem that a new molding apparatus is required and the cost is increased.

Disposable body warmers can be used in a variety of applications, such as the so-called non-stick type that can be used in your hand or in a pocket, the so-called stick-on type that is used by sticking to clothing, or the shoe type that is used in shoes. There is a need to select the breathability for each application.
In other words, the foot type used in shoes and the type attached to the underwear are used in an environment with poor ventilation, so high air permeability (for example, about 3000 sec / 100 cc) is required. If the property is too good, the heat generating material generates too much heat, and therefore it is necessary to suppress air permeability (for example, about 35000 sec / 100 cc).
In order to control the air permeability in this way, it is necessary to adjust the hole diameter and the number of fine holes formed in the air-permeable sheet having the above-described laminated structure, which takes time for manufacturing and increases the cost. There is.

  Such a problem is also related to the separation-type disposable body warmer previously proposed by the present applicant (see Patent Document 2).

  In addition, the applicant of the present invention does not necessarily apply the configuration of the previously proposed bi-fold type disposable body warmer and the separated type disposable body warmer only as a disposable body warmer, one side being a breathable sheet and the other side being a non-breathable sheet. It can be widely used as a packaging material provided with a flat bag body in which a functional filler is enclosed, for example, it can be used as a moisture absorbing sheet, an aromatic sheet, a deodorizing sheet, an insect repellent sheet, etc. I got new knowledge.

  The present invention has been made in view of the above-described conventional circumstances, and the intended process is that one side is made of a breathable sheet and the other side is made of a non-breathable sheet, and a functional filler is enclosed inside. Provided is a packaging material provided with a flat bag body, which can be easily controlled for air permeability in the bag body, is easy to manufacture, and can be provided at a low cost. There is.

  In order to achieve the above object, the present invention provides a packaging material having a flat bag body in which a functional filler is enclosed, wherein one side of the bag body is a breathable sheet and the other side is It consists of a non-breathable sheet, and the breathable sheet is formed by laminating an easy peel film that becomes the surface layer of the bag body on the porous synthetic resin film that becomes the back surface layer of the bag body via an adhesive layer. The easy peel film has a large number of needle holes, and the adhesive layer is formed so as not to block the needle holes.

  Thus, the laminated film which joined the easy peel film in which many needle holes were formed, and the porous synthetic resin film via the contact bonding layer can be easily formed with the existing installation. Moreover, the air permeability of a flat bag body can be appropriately adjusted (for example, about 3000 sec / 100 cc to 35000 sec / 100 cc) by arbitrarily selecting the hole diameter and the number of needle holes formed in the easy peel film. At this time, since the porous synthetic resin film has a large number of fine holes, the number of needle holes to be formed in the easy peel film and the labor of perforation are significantly larger than those disclosed in the prior application by the present applicant. Needless to say, it can be reduced.

In the present invention, since an easy peel film in which a large number of needle holes are formed is a breathable sheet having a laminated structure in which a porous synthetic resin film is bonded via an adhesive (adhesive layer), the porous sheet is porous. When an adhesive is applied to the entire surface of the synthetic resin film (or easy peel film), the fine holes of the porous synthetic resin film and the needle holes of the easy peel film may be blocked by the adhesive.
Therefore, it is necessary to form the adhesive layer so as not to block the needle hole. Specifically, as the adhesive layer, means such as applying an adhesive to a porous synthetic resin film (or easy peel film) in a lattice shape, a mesh shape, a scattered shape, a dot shape, or the like can be given.

As the porous synthetic resin film constituting the air permeable sheet, for example, a porous film made of polyethylene having a thickness of about 40 to 100 μm, linear low density polyethylene, or polypropylene can be used.
As an easy peel film, for example, a styrene resin is laminated on the surface of a polyethylene film, and a film having a thickness of about 20 to 40 μm having an easy peel property with a peel strength that can be peeled off by hand ( For example, “CF film 7601E series” manufactured by Toray Film Processing Co., Ltd. can be used.
Examples of the adhesive for joining the porous synthetic resin film and the easy peel film include polyester resins, polyvinyl acetate resins, ethylene-vinyl acetate resins, polyacrylate resins, vinyl chloride-vinyl acetate. An adhesive such as a copolymer resin system can be used.
Alternatively, a hot-melt type pressure-sensitive adhesive or adhesive that can be heated and melted and exhibits tackiness at normal temperature or when heated and melted can be used. For example, styrene elastomers such as SIS, SBS, SEBS and SIPS, polyethylene, especially olefin polymers such as ultra-low density polyethylene and polypropylene, ethylene / vinyl acetate copolymer, and alkyl esters such as acrylic acid and methacrylic acid are used as components. And acrylic polymers, polyesters, polyamides, urethanes, and other thermoplastic resins.

When many needle holes are formed in the easy peel film, the film may tear from the needle holes. Therefore, it is good to laminate | stack the reinforcement layer which consists of a synthetic resin reinforcement film on the back surface of an easy peel film, and to make an easy peel film into a multilayer. In this case, it goes without saying that the needle hole is formed so as to penetrate the easy peel film and the synthetic resin reinforcing film (reinforcing layer) on the back surface side.
Here, as the synthetic resin reinforcing film for forming the reinforcing layer, a resin film such as nylon, polypropylene, or polyethylene can be used. In consideration of securing the flexibility of the bag body, it is preferable to use a nylon film.

Further, the present invention includes a peelable air blocking means that covers the breathable sheet, and the air blocking means includes an easy peel film that is thermocompression-bonded with easy peelability to the easy peel film. .
When configured in this way, the sealing of the bag body is ensured simply by covering the air permeable sheet with the air blocking means, so that the trouble of filling and sealing the packaging bag (exterior bag) separately can be saved. It can be provided as a less-type packaging material.
As specific embodiments of the ventilation blocking means, for example, the following two configurations can be given.

  (1) The flat bag body is folded at a central portion so that the air-permeable sheet is inside, and is folded into two, and the easy-peel film of the air-permeable sheet that is folded in half The opposing edges are joined together with easy peelability by thermocompression bonding, and are formed to be deformable into a sealed two-fold packaging form and a use form in which the edges of the easy peel film are peeled apart and expanded. .

  (2) Two flat bag bodies are provided, the bag bodies are overlapped so that the breathable sheets face each other, and the easy peel film in the breathable sheet of the overlapped bag body Sealed packaging form in which two facing parts are joined with easy peelability by thermocompression bonding, and usage form in which the edges of the easy peel film are peeled apart and separated into two parts And can be deformed.

  In addition to this, a releasable air blocking sheet covering the air permeable sheet is provided, and the air blocking sheet includes an easy peel film that is thermocompression-bonded with ease to the easy peel film on the bag surface. What is provided can also be used. However, in this case, the ventilation block sheet becomes unnecessary after peeling.

In the present invention, as the non-breathable sheet, a sheet provided with a sealant layer that can be thermocompression bonded to the porous synthetic resin film in the breathable sheet and having a barrier layer laminated on the surface side of the sealant layer is used. it can. The non-breathable sheet having such a structure is normally used in the technical field of disposable body warmers (see, for example, JP 2002-345875 A, JP 2002-360624 A, JP 2006-116171 A, and the like). ).
In the present invention, a non-woven fabric having transparency such as a translucent layer is laminated on the surface side of the barrier layer, and printing is performed on the surface of the barrier layer or the back surface of the non-woven fabric. According to such a configuration, the non-breathable sheet brings out a Japanese-style binding printed on Japanese paper, and can be used as a packaging material with a novel design that has not been conventionally available.

In the present invention, the functional filler to be enclosed in the bag can be arbitrarily selected according to the use, such as a heat generating material, a hygroscopic agent, a fragrance, a deodorant, and an insect repellent.
For example, when the functional filler is a heating material that generates heat upon contact with the air flowing into the bag through the breathable sheet, an exterior-less disposable body warmer can be formed.
When the functional filler is a hygroscopic agent that absorbs moisture in the air flowing into the bag through the breathable sheet, an exterior-less type moisture absorbent sheet can be formed.
When the functional filler is a fragrance, a deodorant or an insect repellent released from the bag through the breathable sheet, an exterior-less fragrance sheet, a deodorant sheet or an insect repellent sheet can be formed. .

  When a disposable body warmer is formed by the packaging material of the present invention, the disposable body warmer can be used as a so-called non-stick type disposable body warmer that is held in a hand or put in a pocket or the like. In addition, an adhesive layer is provided at a desired location of the bag body, and the adhesive layer is covered with a release sheet, and the release sheet is peeled off during use to expose the adhesive layer. Can be used as a disposable body warmer.

  Also in the moisture absorbing sheet, fragrance sheet, deodorant sheet, insect repellent sheet, by providing an adhesive layer at a desired location of the bag and covering the adhesive layer with a release sheet, by peeling the release sheet during use, exposing the adhesive layer, It can be formed so as to be attached to a desired location (for example, a wall). Further, various configurations can be employed depending on the application, such as a direct placement type without providing an adhesive layer, or a separate type with a hook or the like.

  Further, in the present invention, a non-joined portion may be formed on a part of the edges of the joined easy peel film so as to become a clue when peeling the easy peel films joined with easy peelability. .

The peripheral portions of the breathable sheet and the non-breathable sheet forming the bag body are usually thermocompression bonded with difficulty peelability, whereby the flat bag body is formed.
As a more specific example, for example, in the case of a disposable body warmer, when a flat bag is formed, the seal strength (bonding strength) by thermocompression bonding between the peripheral portions of the breathable sheet and the non-breathable sheet is: For example, 15 (N / 25 mm) or more, preferably 20 (N / 25 mm) or more, the peripheral portion of the bag body itself is used as a non-peelable joint.
On the other hand, the sealing strength (peeling strength) by thermocompression bonding between the edges of the easy peel films is, for example, about 8 to 24 (N / 25 mm), preferably about 10 to 17 (N / 25 mm), and the sealing strength (bonding) Strength)> The sealing strength (peeling strength) is set so that the edge portion is an easily peelable joint.
Each of the sealing strengths (bonding strength and peel strength) described above is obtained by opening the ends of the two sheets that are thermocompression-bonded at the center by 180 degrees, and in this state, the ends of the sheets are After fixing to the gripping tool, a tensile stress was applied until the two thermocompression-bonded sheets were peeled, and the maximum stress until peeling was determined.
When used for purposes other than the disposable body warmer, it is generally equivalent to the above-mentioned numerical value, but is not limited to this.

As described above, the present invention is a packaging material including a flat bag body in which a functional filler is enclosed, and the bag body has a breathable sheet on one side and a non-breathable sheet on the other side. The breathable sheet is obtained by laminating an easy peel film as a surface layer of a bag body on a porous synthetic resin film such as polyethylene via an adhesive layer, and the easy peel film includes a number of easy peel films. While having a needle hole, the adhesive layer is formed so as not to block the needle hole.
Therefore, it is possible to provide a packaging material having desired air permeability according to the application easily and at low cost, and various uses such as a disposable type warmer, a moisture absorbing sheet, an aromatic sheet, a deodorizing sheet, and an insect repellent sheet. Can be suitably used.
Further, by providing a peelable air blocking means that is thermocompression-bonded to the easy peel film and covers the breathable sheet, it is possible to save time and materials for filling and sealing a packaging bag (exterior bag) separately. It is possible to provide a new packaging form that is exterior-less, and has many effects.

  Hereinafter, a case where the packaging material according to the present invention is used for a so-called non-stick type disposable body warmer will be described.

1 to 4 show an example in which the present invention is applied to a two-fold type disposable body warmer previously proposed by the present applicant (Japanese Patent Application No. 2006-125787).
That is, the disposable warmer a of this example is one in which the heat generating material 1 is enclosed in a flat bag body 2, and the heat generating material 1 is mixed with, for example, iron powder, water, vermiculite, activated carbon, salts, and the like. A mixed powder that reacts with oxygen and generates heat. In addition, as the heat generating material, the mixed powder can be formed into a sheet shape, or a sheet-like material in which the mixed powder is held can be used.

  At least a part of the bag body 2 has air permeability so that oxygen can be supplied to the heat generating material 1 inside. Specifically, as shown in FIG. The peripheral portions of the non-breathable sheet 4 are thermocompression-bonded with a sealing strength (joining strength) of about 20 (N / 25 mm) to form a non-peelable joint portion 5, thereby forming a flat bag shape. .

  As shown in the enlarged cross section of FIG. 2, the air-permeable sheet 3 is a porous film having a thickness of about 40 to 50 μm, in which a layer serving as the back surface of the bag body 2 (joint surface with the non-air-permeable sheet 4) is made of a low density polyethylene film. The synthetic resin film 3a is formed of fine pores having an average pore diameter of 1 to 10 μm so that the air permeability is about 3000 to 35000 (sec / 100 cc). The peripheral edge portion of the porous synthetic resin film 3 a is thermocompression bonded to the peripheral edge portion of the non-breathable sheet 4 with the above-described seal strength (bonding strength) to form the hardly peelable bonding portion 5.

On the porous synthetic resin film 3a, an easy peel film 3d having a thickness of about 20 to 40 [mu] m and serving as a surface layer of the bag body 2 is laminated via an adhesive layer 3b.
The easy peel film 3d is a film having an easy peel property that is formed by laminating styrene resin or the like on the surface of a polyethylene film and is thermocompression-bonded with a peel strength that can be peeled off by hand. For example, Toray Film Processing Co., Ltd. “CF film 7601E series” manufactured by the company can be used.
Further, the easy peel film 3d is formed into a multilayer by a synthetic resin reinforced film 3c laminated on the back surface side, and the multilayered easy peel film 3d (two layers of the easy peel film 3d and the synthetic resin reinforced film 3c). A needle hole 3e is formed in the film.

  The synthetic resin reinforcing film 3c is made of a nylon film having a thickness of about 8 to 15 μm, and is a reinforcing backing film for preventing tearing of the easy peel film 3d caused by punching the needle holes 3e.

The hole diameter and perforation ratio of the needle holes 3e formed in the two-layer film composed of the easy peel film 3d and the synthetic resin reinforcing film 3c are appropriately selected according to the ventilation function of the breathable sheet 3 required according to the application. .
For example, if the disposable body warmer a is a foot type used in shoes or a type attached to an underwear, it will be used in an environment with poor ventilation, so a high ventilation function (for example, about 3000 sec / 100 cc) ) And the hole diameter and the perforation ratio of the needle holes 3e are appropriately set so that the air-permeable function of the air-permeable sheet 3 can be obtained.
When the disposable body warmer a is a type that does not stick, if the air permeability is too good, the heat generating material 1 generates too much heat. For example, the air permeability needs to be suppressed to about 35000 sec / 100 cc. The hole diameter and the perforation ratio of the needle hole 3e are appropriately set so that the ventilation function can be obtained.

  The adhesive layer 3b uses an adhesive that joins the porous synthetic resin film 3a and the synthetic resin reinforcing film 3c, for example, an adhesive similar to that described in paragraph 0014, and the fine pores of the porous synthetic resin film 3a. In order not to block the needle hole 3e, it is applied in a lattice shape, a mesh shape, a sprayed state such as a spray, or a dot shape.

  As shown in the enlarged cross section of FIG. 3, the non-breathable sheet 4 is a sealant having a thickness of about 15 to 25 μm in which the layer that becomes the back surface of the bag body 2 (joint surface with the breathable sheet 3) is made of a low-density polyethylene film. It is layer 4a, and the peripheral portion of this sealant layer 4a is thermocompression-bonded to the peripheral portion of the porous synthetic resin film 3a in the above-described air-permeable sheet 3 with the above-mentioned seal strength (bonding strength), and hardly peelable bonding Part 5 is formed.

  On the surface side of the sealant layer 4a (the surface side of the bag body 2), a barrier film 4d in which a polyethylene film 4b having a thickness of about 10 to 20 μm is laminated to form a multilayer and a polypropylene film is coated with vinylidene chloride is adhered. The barrier layer is formed by laminating with the agent 4 c to ensure the non-breathing function of the non-breathable sheet 4.

Further, in this example, a nylon non-woven fabric 4e is laminated on the outermost layer (surface layer of the bag body 2) of the non-breathable sheet 4 to be translucent (having transparency) with a basis weight of about 10 to 50 g / m ^2. In addition, a desired print 4f is applied to the front surface (the nylon nonwoven fabric 4e side) of the barrier film 4d or the back surface (the barrier film 4d side) of the nylon nonwoven fabric 4e. As a result, the print 4f can be visually recognized through the nylon nonwoven fabric 4e, and a novel design such as a non-breathable sheet 4 that creates a Japanese-style binding with the print 4e on the Japanese paper. It has come to express.

  The peripheral portions of the air-permeable sheet 3 and the air-impermeable sheet 4 having such a laminated structure are thermocompression bonded at a predetermined temperature and a predetermined pressure, so that the low-density polyethylene films that are innermost layers of each other, that is, porous The synthetic resin film 3a and the sealant layer 4a are joined with a sealing strength of about 20 (N / 25 mm), thereby forming the hardly peelable joining portion 5 and the flat bag body 2 is formed.

  And the disposable body warmer a of this example employ | adopts the sealed packaging form folded in half as shown in FIG.4, FIG.5 as a peelable ventilation | gas_blocking means which covers the above-mentioned air permeable sheet 3. As shown in FIG. .

  That is, the bag body 2 is folded at the center portion so that the air permeable sheet 3 is inside, and is folded in two, and the edges facing each other excluding the bent portion 10 in the easy peel film 3d of the air permeable sheet 3 The peripheral edge portion excluding the folded portion 10 of the bag body 2 folded in half is used as an easily peelable joining portion 6. Thereby, it can deform | transform easily into the usage form shown in FIG. 1 which peeled off the said easily peelable junction part 6 from the sealed two-fold type | mold exterior less packaging form shown in FIG. 4, FIG. It becomes like this.

The easily peelable joining portion 6 is thermocompression bonded with a seal strength (peeling strength) of about 10 to 17 (N / 25 mm) between mutually facing edges excluding the bent portion 10 in the two-folded easy peel film 3d. Is formed.
According to such a packaging form, the air-permeable surface of the bag body 2 (the surface formed by the air-permeable sheet 3) has a sealed structure that does not come into contact with air. It can be stored and transported as it is without being sealed or covered with an exterior material.

  Operation pieces 7a and 7b for peeling off the above-described easily peelable joint portion 6 are formed on a part of the peripheral edge portion of the bag body 2 that is folded in half except for the bent portion 10. The operation pieces 7 a and 7 b are formed by not thermocompressing a part of the peripheral edge of the breathable sheet 3 when forming the easily peelable joint 6. When the operation pieces 7a and 7b are provided, the easily peelable joint portion 6 can be easily peeled off at the time of use by using the operation pieces 7a and 7b as a clue.

  Further, in this example, as shown in FIG. 5, the operation pieces 7a and 7b described above are formed on the edge (front edge) facing the folded portion 10 in the folded bag body 2, and the front edge The easily peelable joint portion in the portion can be peeled off very easily as a mountain-shaped easily peelable joint portion 6 ′ having a vertex 6 a at the center in the width direction of the bag body 2. ing.

FIG. 6 shows an example in which a part of the disposable body warmer a is modified.
In the disposable body warmer a ′ of this example, the air-permeable sheet 3 and the non-air-permeable sheet 4 are partially attached to the bent portion 10 in the bag body 2 with the same sealing strength as the non-peelable joint portion 5. A band-shaped partition portion 10 'joined is formed, and the heat generating material 1 is enclosed in the left and right internal spaces 11a and 11b partitioned by the partition portion 10', and the bag body is formed by the partition portion 10 '. By folding 2, the above-described sealed two-fold type exterior-less packaging form is formed.

  In this way, by folding the bag body 2 at the partition portion 10 ′ to be folded in two, the heat generating material 1 does not exist in the two-fold portion (partition portion 10 ′), and the folded portion becomes thick. Therefore, a so-called tunnel phenomenon in which a through hole is formed at the center can be prevented. Therefore, the edges of the air-permeable sheet 3 are securely adhered and thermocompression bonded at both ends of the bent portion (partition portion 10 ′), and the inflow of air from both ends of the bent portion can be prevented.

In addition, although the above-mentioned disposable warmer a which concerns on FIGS. 1-5 shows the example as what is called a "no sticking type", the disposable warmer a 'of this example is comprised as a "sticking type". . That is, in this example, the pressure-sensitive adhesive layer 12 is provided on the entire outer surface of the non-breathable sheet 4 and is covered with the release sheet 13 so that the release sheet 13 is peeled off at the time of use, and can be used by being attached to a desired location. It has become.
The site where the pressure-sensitive adhesive layer 12 is covered with the release sheet 13 can be selected as appropriate, for example, partially on the surface of the air-permeable sheet 3 or on the portions where the operation pieces 7a and 7b are formed.

7 and 8 show an example in which the present invention is applied to the separation-type disposable body warmer previously proposed by the present applicant (Japanese Patent Application No. 2006-125788).
The disposable body warmer a ″ in this example prepares two of the aforementioned bag bodies 2 in which the heat generating material 1 is enclosed, and these bag bodies 2 and 2 are overlapped so that the breathable sheets 3 and 3 face each other, In addition, the peripheral edges of the easy peel films 3d and 3d of the breathable sheets 3 and 3 that are opposite to each other are thermocompression-bonded so as to be peelable. The easily peelable joining portion 6 is formed, and the two bag bodies 2 and 2 are overlapped to form a sealed exterior-less packaging form (see FIG. 7).

  That is, the peripheral edges of the easy peel films 3d and 3d, which are the outermost layers of each other, are thermocompression bonded to each other with the predetermined temperature and the predetermined pressure between the peripheral edges of the breathable sheets 3 in the overlapped bag bodies 2 and 2. The parts are joined with a seal strength (peel strength) of about 10 to 17 (N / 25 mm), whereby an easily peelable joint 6 is formed, and the two bags 2 and 2 are joined in a sealed manner. A separate disposable body warmer a ″ is formed.

  According to such a packaging form, the air-permeable surfaces (surfaces formed by the air-permeable sheet 3) of the respective bag bodies 2 and 2 have a sealed structure that does not come into contact with air. It can be stored and transported as it is without being enclosed in an outer bag or covered with an outer packaging material.

The aforementioned operation pieces 7a and 7b when the peelable joint portion 6 is peeled off are formed on a part of the peripherally bonded portion (easy peelable joint portion 6) of the overlapped bag bodies 2 and 2. Has been.
In use, the operation pieces 7a and 7b are picked up with a finger to peel off the peripheral edge portion (easy peelable joint portion 6), and the overlapped bag bodies 2 and 2 are separated. There are two disposable warmers a (see FIG. 8). In this state, the breathable sheet 3 of each bag body 2 is exposed and exposed to air, oxygen in the air passes through the breathable sheet 3 and the heat generating material 1 generates heat, and each can be used.
Therefore, it is suitable for the case where each bag body 2, 2 is used in the left and right pockets, or is required as a pair of left and right, such as for warming in gloves or for warming in shoes. Can be used.

In addition, the disposable warmer a ″ of this example also has a so-called “sticking type” by providing an adhesive layer 12 covered with a release sheet at an arbitrary position in each bag body 2 similarly to the warmer a ′ according to FIG. You can also
Moreover, the shape of the bag body 2 is not limited to the illustrated shape, and any shape can be selected as long as it is flat, such as a square shape, a circular shape, or an elliptical shape.

  In the illustrated example, the application example as a disposable body warmer has been described. However, instead of the heat generating material 1, if a hygroscopic agent is enclosed in the bag body 2, a disposable exterior-less moisture absorbent sheet can be obtained. If you enclose the agent, you can make a disposable exterior-less fragrance sheet, if you enclose the deodorant, you can make a disposable exterior-less deodorant sheet, It can be an exterior-less insect repellent sheet. It is also possible to appropriately select and use functional fillers other than these.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described example, and various modifications can be made within the scope of the technical idea described in the claims. Needless to say.

The center vertical front view of the bag body in an unfolded state (use form) is related to an example of an embodiment in which the present invention is applied to a double-folded exterior-less disposable body warmer. It is an expanded sectional view of the air permeable sheet which comprises the bag shown in FIG. It is an expanded sectional view of the non-breathable sheet which constitutes the bag shown in FIG. It is a center longitudinal front view showing the state (exterior-less packaging form) which folded the disposable body warmer shown in FIG. It is a perspective view of the disposable body warmer shown in FIG. It is a center vertical front view showing a partial change example of the disposable body warmer shown in FIGS. 1 to 5 and showing a folded state (exterior-less packaging form). The center longitudinal section front view in an example which concerns on an example which applied the present invention to a separation type exterior less disposable body warmer, and overlaps bag bodies (packaging form) is shown. The center vertical front view in the state (usage form) of the disposable body warmer shown in FIG. 7 which isolate | separated bags is shown.

Explanation of symbols

a, a ′, a ″: Disposable body warmer 1: Heat generating material 2: Bag body 3: Breathable sheet 3a: Porous synthetic resin film 3b: Adhesive layer 3c: Synthetic resin reinforcing film 3d: Easy peel film 3e: Needle hole 4 : Non-breathable sheet 4a: Sealant layer 4d: Barrier film (barrier layer)
4f: Printing 4e: Non-woven fabric 5: Difficult peelable joint 6: Easy peelable joint

Claims (9)

A packaging material having a flat bag body in which a functional filler is enclosed,
The bag body has a breathable sheet on one side and a non-breathable sheet on the other side,
The breathable sheet is formed by laminating an easy peel film serving as a surface layer of the bag body on an adhesive layer on a porous synthetic resin film serving as a back layer of the bag body, and the easy peel film. Has a large number of needle holes, and the adhesive layer is formed so as not to block the needle holes.   The easy peel film is multi-layered by a synthetic resin reinforced film laminated on the back side, and the needle holes penetrate the easy peel film and the synthetic resin reinforced film on the back side. The packaging material according to claim 1.   2. A peelable air blocking means for covering the breathable sheet, wherein the air blocking means comprises an easy peel film that is thermo-compressed with easy peelability to the easy peel film. 2. The packaging material according to 2.   The flat bag body is folded in half so that the air-permeable sheet is inside, and is folded in two, and the edge of the easy-peel film in the air-permeable sheet that is folded in half The parts are joined to each other with easy releasability by thermocompression bonding, and are formed to be deformable into a sealed two-fold packaging form and a use form in which the edges of the easy peel film are peeled apart and developed. The packaging material in any one of -3.   Two flat bag bodies, the bag bodies are overlapped so that the breathable sheets face each other, and the edges of the easy peel film in the breathable sheets of the overlapped bag bodies are opposed to each other The parts are joined together with easy peelability by thermocompression bonding, and transformed into a sealed packaging form in which two bags overlap each other and a usage form in which the edges of the easy peel film are peeled apart and separated into two parts The packaging material in any one of Claims 1-3 formed so that it was possible.   The non-breathable sheet includes a sealant layer that can be thermocompression bonded to the porous synthetic resin film in the breathable sheet, and a barrier layer is laminated on the surface side of the sealant layer, and on the surface side of the barrier layer. The packaging material according to any one of claims 1 to 5, wherein a nonwoven fabric having permeability is laminated and printing is performed on the front surface of the barrier layer or the back surface of the nonwoven fabric.   The functional filling material is a heat generating material that generates heat upon contact with air flowing into the bag through the breathable sheet, and is used for an exterior-less disposable body warmer. The packaging material in any one of -6.   2. The functional filler is a hygroscopic agent that absorbs moisture in the air flowing into the bag through the breathable sheet, and is used for an exterior-less type hygroscopic sheet. The packaging material in any one of -6.   The functional filler is a fragrance, a deodorant, or an insect repellent that is released from the bag through the breathable sheet, and is used for an exterior-less fragrance sheet, a deodorant sheet, or an insect repellent sheet. The packaging material according to any one of claims 1 to 6.

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