JP4965336B2 - Outer bag-less type disposable body warmer and manufacturing method thereof - Google Patents

Description

  The present invention relates to a disposable body warmer, and in particular, to an improvement in a packaging form of a disposable body warmer in which a heat generating material is enclosed in a bag.

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 packaging bag (outer bag) made of a non-breathable sheet, hermetically sealed one by one. When the packaging bag is broken and taken out, oxygen in the air is removed from the bag. The heat generating material generates heat through the.
The bag body in which the heat generating material is enclosed is generally formed in 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. .

  By the way, the conventional disposable body warmer must enclose the bag body in which the heat generating material is enclosed one by one in the packaging bag (outer bag) at the time of manufacture, and there is a limit to simplification of the manufacturing process and cost reduction. there were. 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, for example, as disclosed in Patent Document 1, on a breathable sheet in which a polyethylene film is laminated on a nonwoven fabric and pores are arranged, a polyvinylidene chloride coated polyester film or the like is used. A proposal has been made that a non-ventilated sheet is adhered, the adhesive strength thereof is set to about 50 to 300 g / 15 mm so that the sheet can be easily peeled off, and a packaging bag is unnecessary.

Japanese Utility Model Publication No. 61-80015

  However, according to the conventional outer bagless disposable body warmer described above, there are two types of sheets: a breathable sheet in which a polyethylene film is laminated on a nonwoven fabric and pores are arranged, and a non-breathable sheet such as a polyvinylidene chloride coated polyester film. Since these two types of sheets are bonded together to form a bag body, there is a problem that it takes time for manufacturing and increases the cost.

  The present invention has been made in view of the above-described conventional circumstances, and the intended process is to enclose a heat generating material in a flat bag body, one side of which is breathable and the other side is non-breathable. And a disposable body warmer that eliminates the need for a packaging bag (outer bag) by providing means for releasably closing the ventilation surface of the bag body, and can be easily manufactured and provided at low cost. It is to provide a new outer bag-less type disposable body warmer.

In order to achieve the above-described object, the disposable body warmer according to the present invention is a body warmer body in which a heating material is sealed in a flat bag body having a ventilation surface on one side and a non-venting surface on the other side. And a non-breathable release sheet that is releasably bonded to the ventilation surface, wherein the bag and the release sheet are formed of the same laminated film, and the laminated film has at least an outermost layer on one side. It is an easy peel layer that can be easily peeled and sealed by thermocompression bonding, and the outermost layer on the other side is a thermoplastic resin layer that can be hardly peeled and sealed by thermocompression bonding, and the bag body includes the laminated film and the easy peel layer. Folded in half between the air- permeable surface (3) and the non-air- permeable surface (5) so that the outer side is the thermoplastic resin layer and the inner side is the inner side , and the peripheral edges are peeled and sealed to form a flat bag shape. The release sheet The bag body is superposed on the bag body so that the surface facing the ventilation surface is the easy peel layer, and the peripheral portions thereof are easily peeled and sealed to cover each ventilation hole of the ventilation surface in a sealed manner. It is characterized by that.

  In such a configuration, the ventilation surface is closed with a release sheet, and the heat-generating material-containing bag body that can be easily peeled off and used is folded on a single laminated film. It can be obtained by a simple manufacturing method in which key points are thermocompression bonded. Therefore, it is a disposable body warmer which does not require a packaging bag (outer bag), and can achieve the object of the present invention that can be easily manufactured and can be provided at low cost. Moreover, since the bag body and the release sheet are formed of the same laminated film, there is an advantage that it is not necessary to separate waste after use.

  The disposable body warmer of the present invention can be used by exfoliating the release sheet and exposing the ventilation surface of the bag body so that the heat generating material generates heat. The release sheet is preferably provided with a non-joining portion (a knob portion) that serves as a clue when peeling off.

  The easy peel layer in the laminated film can be formed of an easy peel film, for example. The thermoplastic resin layer can be formed of, for example, a polyethylene (PE) film or an ethylene copolymer (EAA, EMAA, EMA, EEA, EMMA) film. The laminated film preferably includes an oxygen and water vapor barrier layer and a reinforcing layer for imparting tear resistance in the intermediate layer.

  The air permeability of the bag can be appropriately adjusted by arbitrarily selecting the hole diameter and number of air holes (needle holes) formed in the air-permeable surface portion of the laminated film. Usually, this kind of disposable body warmer has a breathability within a range of, for example, about 3 sec / 100 ml to 60 sec / 100 ml (measured by a Gurley type densometer manufactured by Toyo Seiki Seisakusho Co., Ltd.) in accordance with the use and size. It is adjusted as follows.

  As an easy peel film for forming an easy peel layer, for example, a styrene resin is laminated on the surface of a polyethylene film, and it is easily peeled and peeled by hand. A film having a thickness of about 20 to 40 μm.

When many air holes are formed in the easy peel film, the film may be torn from the air holes. In addition, the heat generating material in the bag body is oxidized and hardened during use of the body warmer, and it is necessary to consider not to tear the bag body (film) even if the bag body is gripped by hand in such a state. .
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 provide the reinforcement layer for tear resistance provision to an easy peel film. 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.

  For example, a polyethylene film can be used as a film for forming the thermoplastic resin layer. In addition, as a film for forming a barrier layer for blocking oxygen and water vapor, a general film in this kind of field such as a laminated film of polypropylene (PP) and polyvinylidene chloride (PVDC) (KOP30) can be used. (For example, refer to JP 2002-345875 A, JP 2002-360624 A, JP 2006-116171 A, etc.).

The peripheral edge of the bag is usually thermocompression bonded with difficulty. Specifically, when forming a flat bag body in a disposable body warmer, the sealing strength (bonding strength) by thermocompression between the peripheral portions of the ventilation surface and the non-venting surface is generally 15 (N / 25 mm). As mentioned above, Preferably it is 20 (N / 25mm) or more, and let the peripheral part of this bag body be a hard-peeling seal part.
On the other hand, the sealing strength (peeling strength) by thermocompression bonding between the edges of the easy peel layers is thermocompression bonding with easy peelability. In the present invention, thermocompression bonding is performed so that the peel strength is in the range of 8 to 24 (N / 25 mm), preferably 10 to 17 (N / 25 mm), and the pressure-bonded portion is used as an easily peelable seal portion.
In addition, the relationship between the strength (bonding strength) of the hardly peelable seal portion and the strength (peeling strength) of the easily peelable seal portion is the strength of the difficult peelable seal portion (bonding strength)> the strength of the easily peelable seal portion (peeling strength). It goes without saying that it becomes.
Here, the respective seal strengths (bonding strength, peel strength) are determined by opening the ends of the two sheets that have been thermocompression-bonded at the center by 180 degrees, and in this state, the end portions of the respective 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.
Moreover, the said hard-peeling seal part and an easy-peeling seal part can be formed simultaneously by one thermocompression bonding.

  The disposable body warmer of the present invention can be a so-called “non-stick type disposable body warmer” that can be used by holding it in your hand or in a pocket. In addition, an adhesive layer is provided on the non-ventilated surface of the bag body, the adhesive layer is covered with release paper, and the release paper is peeled off during use to expose the adhesive layer. Type of disposable body warmers ”.

As a preferred method for producing a disposable body warmer according to the present invention,
The laminated film is continuously provided with a portion corresponding to a ventilation surface and a portion corresponding to a non-venting surface in the bag body, and a portion corresponding to the release sheet,
Folding the laminated film into a Z shape so that the portion corresponding to the air-permeable surface is sandwiched between the portion corresponding to the non-air-permeable surface and the portion corresponding to the release sheet,
Between the portion corresponding to the air-permeable surface and the portion corresponding to the non-air-permeable surface, leaving the filling space and the filling port of the heat generating material, the peripheral edge of the laminated film folded into the Z shape is thermocompression bonded,
After filling the heating space from the filling port into the filling space, thermocompression bonding the filling port,
Forming a flat bag body in which a heat generating material is enclosed, and bonding a release sheet covering each air hole of the bag body in a sealed manner to the air vent surface of the bag body so as to be easily peelable,
Then, the method of cut | disconnecting the bifold part which is a boundary of the said ventilation | gas_flowing surface and a peeling sheet leaves a hard-peeling seal part and an easy-peeling seal part can be mention | raise | lifted.

As described above, the present invention is an outer bag-less disposable body warmer comprising a flat bag body in which a heat generating material is enclosed, and a release sheet that releasably closes the ventilation surface of the bag body. The outer bag is unnecessary, and effects such as reduction in manufacturing cost and reduction of waste after use can be obtained.
Further, the outermost layer on one side is an easy peel layer that can be easily peeled and sealed by thermocompression bonding, and the outermost layer on the other side is a thermoplastic resin layer that can be hardly peeled and sealed by thermocompression bonding. Since the body and the release sheet are formed, there is an advantage that it is not necessary to separate garbage after use.
In addition, it can be manufactured by a simple manufacturing method in which a key point of a single laminated film is folded and the key point is thermocompression-bonded, and can be provided easily and at a low cost.

  Hereinafter, an example of an embodiment will be described with reference to the drawings.

  Disposable body warmer A of this example encloses exothermic material 1 in flat bag body 2, and covered ventilation surface 3 of this bag body 2 with exfoliation sheet 4, and exothermic material 1 For example, it is a mixed powder in which iron powder, water, vermiculite, activated carbon, salts and the like are mixed, and reacts with oxygen to generate 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 folded surfaces (the air-permeable surface 3 and the non-air-permeable surface 5) are formed in a flat bag shape by being difficult to peel and seal. In the present example, the peripheral edge portions are thermocompression-bonded with a seal strength (joining strength) of about 20 (N / 25 mm), so that the bag body 2 is configured with the peripheral edge portion as a hardly peelable seal portion 6.
A large number of ventilation holes (needle holes) 7 are formed in the ventilation surface 3 of the bag body 2. The disposable body warmer A of this example is a so-called non-sticking type, and 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 10 to 15 sec / 100 ml. Therefore, the hole diameter and the perforation ratio of the vent hole 7 are appropriately set so that the vent surface 3 has such a vent function.

  The release sheet 4 is a non-breathable film (laminated film a) having the same size as the vent surface 3 of the bag body 2 or having a knob portion 8 for peeling off, and the surface facing the vent surface 3 is described later. It overlaps with the bag body 2 so that it becomes the easy peel layer 11 to be peeled, and its peripheral portions are easily peeled and sealed to cover each vent hole 7 of the vent surface 3 in a sealed manner. In this example, the peripheral edge portions are thermocompression bonded with a seal strength (peel strength) of about 10 to 17 (N / 25 mm) so that the peripheral edge portion can be used as the easy peel seal portion 9 to easily release the release sheet 4. Can be peeled off.

  As shown in the enlarged view of FIG. 2, the outermost layer on one side is an easy peel layer 11 that can be easily peeled and sealed by thermocompression bonding, and the outermost layer on the other side can be hardly peeled and sealed by thermocompression bonding. As described above, the bag body 2 is folded in half so that the easy peel layer 11 is on the outer side and the thermoplastic resin layer 15 is on the inner side. It is formed by sealing with difficulty peeling. As described above, the release sheet 4 has the easy peel layer 11 opposed to the ventilation surface 3, and its peripheral portions are easily peeled and sealed to cover each ventilation hole 7 in a sealed manner.

  The easy peel layer 11 is made of an easy peel film in which styrene resin or the like is laminated on the surface of a polyethylene film, and has an easy peel property that is thermocompression bonded 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.

On the back surface of the easy peel layer 11, a reinforcing layer 12 made of a nylon film having a thickness of about 8 to 15 μm is laminated in order to prevent tearing by forming a vent hole (needle hole) 7.
On the back surface of the reinforcing layer 12, a barrier layer 13 made of a laminated film (KOP30) of polypropylene (PP) and polyvinylidene chloride (PVDC) is laminated to block the passage of oxygen and water vapor.

  The thermoplastic resin layer 15 is made of a low density polyethylene film having a thickness of about 15 to 25 μm, and a polyethylene film 14 having a thickness of about 10 to 20 μm is laminated on the back side (between the barrier layer 13). It is stratified.

According to the disposable body warmer A of this example having such a configuration, the heat generating material 1 in the bag body 2 is prevented from being heated by sealing the ventilation surface 3 with the release sheet 4 in an airtight manner. 4 can be easily peeled off to expose the ventilation surface 3 to generate heat. Therefore, it can be used as a disposable body warmer that does not require a packaging bag (outer bag).
Moreover, since the bag body 2 and the release sheet 4 are made of the same laminated film a, the number of types of forming materials can be reduced and manufacturing at low cost can be achieved. In addition, it can be expected that there is no need to separate garbage after use.
Moreover, the disposable body warmer A of this example can be easily manufactured by the following method.

As shown in FIG. 3, the laminated film a used in the manufacture of the disposable body warmer A of this example includes a part a ₁ corresponding to the ventilation surface 3 and a part a ₂ corresponding to the non-venting surface 5 in the bag body ₂ and a release sheet. The portion a ₃ corresponding to 4 is continuously provided. The portion a ₁ corresponding to the ventilation surface is provided with the vent hole 7 described above, and the portion corresponding to the release sheet is the knob portion 8 described above. Is included.

First, in such a laminated film a, a Z-type is formed such that a portion a ₁ corresponding to the air-permeable surface ₃ is sandwiched between a portion a ₂ corresponding to the non-air-permeable surface 5 and a portion a ₃ corresponding to the release sheet 4. (See FIG. 4).

Next, with the bent state, the filling space 20 and the filling port 21 of the heat generating material 1 are placed between the portion a ₁ corresponding to the ventilation surface and the portion a ₂ corresponding to the non-venting surface. The peripheral edge of the laminated film folded into the Z shape (in this example, three sides of the left and right sides and the lower side) is thermocompression-bonded, and the above-mentioned hardly peelable seal part 6 and easy peelable seal part 9 are attached to the three sides. Form. In this state, the heating material 1 is filled from the filling port 21 into the filling space 20 using a measuring device 22 or the like (see FIGS. 5 and 6).

  Then, after the heating material 1 is filled, the filling port 21 (the upper side in this example) is thermocompression-bonded to form the aforementioned hardly peelable seal portion 6 and the easily peelable seal portion 9 on the one side. As a result, a flat bag body 2 in which the heat generating material 1 is enclosed is formed, and a release sheet 4 that covers each air hole 7 of the bag body 2 in a sealed manner is easily attached to the vent surface 3 of the bag body 2. Joined in a peelable manner. Further, of the two folded portions 30 and 31 bent into the Z shape as described above, the folded portion 31 that is the boundary between the ventilation surface 3 and the release sheet 4, that is, the surplus portion is replaced with the hardly peelable seal portion 6. And cut with leaving the easily peelable seal portion 9 (see FIGS. 7 and 8).

The disposable body warmer A shown in FIG. 1 can be manufactured by such a procedure.
In addition, the manufacturing method of this example manufactures several disposable body warmers A at a time, as shown in FIG. 5, by selecting suitably the magnitude | size of the laminated | multilayer film a, the location of thermocompression bonding, and a subsequent cutting location. It is also possible.

  In the present invention, the shape of the bag body 2 is not limited to the illustrated example, and can be arbitrarily selected as long as it is a flat shape such as a square shape, a circular shape, or an elliptical shape.

  In the illustrated example, the disposable body warmer has been described. However, instead of the heat generating material, if a hygroscopic agent is enclosed in the bag, it can be a disposable outer bag-less hygroscopic material, and if a fragrance is enclosed, the disposable type is used. The outer bag-less fragrance can be made into a disposable outer bag-less deodorant by enclosing a deodorant, and the disposable outer bag-less insect-proof body can be made by enclosing an insect repellent. be able to.

  The embodiment and reference examples of the present invention have been described above, but the present invention is not limited to the above-described examples, 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 which shows one embodiment of the disposable body warmer which concerns on this invention. The expanded sectional view of the laminated film which comprises the disposable body warmer shown in FIG. The expansion | deployment perspective view of the laminated | multilayer film used for manufacture of the disposable body warmer shown in FIG. The perspective view which shows the process of bending the laminated | multilayer film shown in FIG. 3 in Z shape. The perspective view which shows the process of filling the heat-emitting material, after carrying out the thermocompression bonding of the principal part of the laminated | multilayer film shown in FIG. FIG. 4 is a longitudinal side view of the state shown in FIG. 3. The perspective view which shows the process of cut | disconnecting an excess part, after filling a heat generating material and carrying out the thermocompression bonding of the filling port. The longitudinal cross-sectional view of the state shown in FIG.

Explanation of symbols

A: Disposable body warmer 1: Heat generating material 2: Bag body 3: Venting surface 4: Release sheet 5: Non-ventilated surface 6: Difficult to peel seal part 7: Vent hole 8: Pick part 9: Easy peel seal part a: Laminated film 11 : Easy peel layer 12: Reinforcement layer 13: Barrier layer 15: Thermoplastic resin layer

Claims (6)

A warmer body in which a heat generating material (1) is enclosed in a flat bag body (2) having a ventilation surface (3) having a plurality of ventilation holes (7) on one side and a non-venting surface (5) on the other side; A non-breathable release sheet (4) releasably bonded to the vent surface,
The bag (2) and the release sheet (4) are formed of the same laminated film (a), and at least the outermost layer on one side of the laminated film can be easily peeled and sealed by thermocompression bonding ( 11), and the outermost layer on the other side is a thermoplastic resin layer (15) that can be hardly peeled and sealed by thermocompression bonding,
The bag body (2) folds the laminated film between the ventilation surface (3) and the non-ventilation surface (5) so that the easy peel layer is on the outside and the thermoplastic resin layer is on the inside. The peripheral edge portions are difficult to peel off (6) and are formed into a flat bag shape,
The release sheet (4) is overlapped on the bag body so that the surface facing the ventilation surface of the bag body becomes the easy peel layer, and the peripheral portions thereof are easily peeled and sealed (9) to form the ventilation surface. An outer bag-less type disposable body warmer characterized in that each air hole (7) is covered in a sealed manner.   The disposable body warmer according to claim 1, wherein the exothermic material (1) generates heat and can be used by exfoliating the release sheet (4) and exposing the ventilation surface (3) of the bag.   The disposable body warmer according to claim 1 or 2, wherein the easy peel layer (11) in the laminated film is an easy peel film.   The disposable body warmer according to any one of claims 1 to 3, wherein the thermoplastic resin layer (15) in the laminated film is made of a polyethylene film or an ethylene copolymer film.   The disposable warmer according to any one of claims 1 to 4, wherein the laminated film includes an oxygen and water vapor barrier layer (13) and a reinforcing layer (12) for imparting tear resistance in an intermediate layer thereof. It is a manufacturing method of the disposable body warmer in any one of Claims 1-5,
The laminated film (a) continuously includes a portion (a1) corresponding to the ventilation surface and a portion (a2) corresponding to the non-venting surface and a portion (a3) corresponding to the release sheet in the bag (2). Ready for
The laminated film is folded into a Z shape so that the portion (a1) corresponding to the air-permeable surface is sandwiched between the portion (a2) corresponding to the non-air-permeable surface and the portion (a3) corresponding to the release sheet,
A laminated film folded into the Z shape leaving a filling space (20) and a filling port (21) of the heating material (1) between a portion corresponding to the ventilation surface and a portion corresponding to the non-venting surface. Thermocompress the periphery of
After filling the heating space (1) into the filling space from the filling port (21), the filling port is thermocompression bonded,
A flat sheet (2) in which a heat generating material is enclosed is formed, and a release sheet (4) that covers each air hole (7) of the bag is hermetically sealed on the air vent surface (3) of the bag. Bonded easily peelable,
Thereafter, the two-folded portion (31) that is the boundary between the ventilation surface (3) and the release sheet (4) is cut leaving the hardly peelable seal portion 6 and the easily peelable seal portion 9, and any one of claims 1-5. A method for producing a disposable body warmer, comprising:

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