JP2006306404A - Packaging material for disposable body warmer, and disposable body warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging material for a disposable body warmer without using an outer packaging bag to avoid double-packaging. <P>SOLUTION: The body warmer packaging material storing a heating element which reacts with oxygen in the atmosphere to generate heat is a four-side-sealed bag obtained by laying a front film 10 and a rear film 20 and sealing their peripheries. The front film 10 is constituted of a barrier film 11 as a base material with a sealant layer 12 laminated on at least its internal surface. The rear film 20 is constituted of a base material film 21 with numerous through holes 24 bored, an layer 22 for providing easy peelability, and a barrier film 23 which are sequentially laminated. A peelable varnish layer 25 is formed at one of edges of the base material film between the base material film and the layer 22 of the rear film 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a packaging material for a used warmer, and in particular, a used hand warmer packaging material that does not require an outer bag and a handmade produced using the used warmer packaging material. About Cairo.

  Conventionally, a warmer body in which a heating element made of iron powder, water, activated carbon, wood powder, vermiculite, salt, etc. is enclosed in a sheet-like inner bag, and an outer bag for shielding the warmer body from outside air to prevent heat generation Products that are packaged and used as portable hand warmers are available.

  At the time of use, the outer bag is cut, the body body is taken out, and the release paper is peeled off from the shirt or the underwear or from the inner bag and used on the clothing.

  Portable hand warmers can be used with simple operation, but after opening, the outer bag is unnecessary and becomes garbage, and it is also a packaging material that the inner bag and outer bag are double wrapped. This is a cause of increasing costs.

  The present invention has been made in view of the above-described problems relating to packaging materials for disposable warmers. The packaging material for useable warmers without using double packaging without using an outer bag and the used warmers are provided. It is an object of the present invention to provide a hand warmer manufactured using a packaging material.

  The invention of claim 1 of the present invention is a packaging material for use warmers that contains a heating element that generates heat by reacting with oxygen in the atmosphere, and the packaging material for warmers comprises a front film and a back film, It is a four-sided sealing bag having a peripheral edge sealed, wherein the front film has a configuration in which a barrier film is used as a base material and a sealant layer is laminated on at least an inner surface, and the back film has a plurality of through holes. It consists of a base film, an easily peelable layer, and a barrier film laminated in order, and on one edge of the base film between the base film of the back film and the easily peelable layer A packaging material for disposable warmers, wherein a release varnish layer is formed.

  Thus, according to the first aspect of the present invention, in the packaging material for use warmers that stores a heating element that generates heat by reacting with oxygen in the atmosphere, the packaging material for warmers comprises a front film and a back film. It is a four-sided sealing bag formed by overlapping and sealing the periphery thereof, wherein the front side film has a configuration in which a barrier film is used as a base material and a sealant layer is laminated on at least an inner surface, and the back side film has a large number of penetrating holes. One end of the base film between the base film of the back film and the easy peelability layer, comprising a base film with holes formed therein, an easy peelability imparting layer and a barrier film. Since the release varnish layer is formed on the edge, the peripheral film is heat sealed with the sealant layer surface of the front film facing the base film surface with through holes in the back film facing each other. When the side-sealed bag is produced, the interface between the easily peelable layer and the base film of the backside film of the four-sided sealed bag can be easily peeled off using the peeling varnish layer as a trigger, and the backside film is easily peeled off. The outer composite film from the property-imparting layer is separated from the four-sided sealing bag, and the heating element stored in the four-sided sealing bag absorbs external oxygen from the through holes of the base film, and the heating element exhibits a heating action. be able to.

  Moreover, since both the front film and the back film are rich in barrier properties, in the state as it is, oxygen in the atmosphere does not come into contact with the heating element, so that the heating element does not generate heat during distribution.

  The invention of claim 2 is a use warmer packaged with the use warming packaging material of claim 1.

  As described above, by using the packaging material for a hand warmer according to the present invention, it is excellent in convenience at the start of use (it is only necessary to peel off the barrier film without taking it out of the outer bag), and the size is reduced. This makes it possible to produce hand warmers that can be produced with conventional equipment that does not require outer packaging.

The present invention will be described in detail below based on one embodiment.
As shown in FIG. 1, for example, the packaging material for a hand warmer of the present invention is a four-side sealed bag formed by superimposing a front film (10) and a back film (20) and sealing the periphery (2). 1) A packaging material for use warmers in which a heating element (B) that generates heat by reacting with oxygen in the atmosphere is housed.

  The front film (10) has a configuration in which the barrier film (11) is a base material and the sealant layer (12) is laminated on at least the inner surface.

  As the barrier film (11), a thin film of an inorganic compound such as aluminum oxide or silicon oxide is physically vapor-deposited or chemically formed on a stretched film such as an aluminum foil, a uniaxially or biaxially stretched polyester film, a polyamide film or a polyolefin film. Excellent in generally known gas barrier properties and water vapor barrier properties, such as an inorganic compound vapor-deposited plastic film provided to a thickness of about 20 to 100 nm by a vapor deposition method such as vapor deposition, a stretched polypropylene film thinly coated with vinylidene chloride resin, and a nylon film. The film can be preferably used.

  The barrier film (11) may have a multilayer structure of two or more layers instead of a single layer. In that case, it can bond together using well-known laminating methods, such as a dry laminating method.

  As the sealant layer (12), one having a melting point higher than the heat generation temperature of the warmer is desirable, but if there is no low-temperature sealing property, the filling machine speed when filling the four-sided sealing bag is limited, Polyolefin resins such as polyethylene and polypropylene including linear low density polyethylene having a melting point of about 70 to 160 ° C. are desirable.

In general, the sealant layer (12) is generally laminated on the barrier film (11) by an extruder laminating method.
Moreover, you may provide the printing layer and aluminum vapor deposition plastic film layer for concealing the content inside a sealant layer (12).

  The back film (20) has a configuration in which a base film (21), an easily peelable layer (22), and a barrier film (23) are sequentially laminated.

Since the base film (21) plays a role of holding the heating element (B) as the contents, it requires toughness but does not require barrier properties, air passes through, and the heating element does not jump out. It is necessary to make a large number of through-holes (24) of the same degree. Moreover, since it is located opposite to the sealant layer (12) of the front film, at least the surface of the base film facing the sealant layer (12) needs to have heat fusion properties.

  For this reason, the base film (21) is a biaxially stretched nylon film or a biaxially stretched polyethylene terephthalate film, and the same resin as the sealant layer (12) of the front film as a sealant layer, that is, a melting point of 70 to It is preferable to use a composite film obtained by laminating a polyolefin resin such as polyethylene or polypropylene containing linear low density polyethylene of about 160 ° C. by a melt extrusion lamination method.

  For the drilling process on the base film (21), a method of physically drilling a hole smaller than the contents with a fine needle or the like, or baking by a discharge process, a laser process or the like can be used.

When a bag is made into a four-side sealed bag on the film surface opposite to the sealant layer of the base film (21), a release varnish layer (25) containing polyethylene wax or the like as a main component is gravure-coated at the portion that becomes the seal edge. A thickness of about 0.1 to 3 μm is formed by a printing method.
The peeling varnish layer (25) may be formed, for example, in a triangular shape only at the corners when the four-side sealed bag is made.

  Resin which has easy peelability with respect to the sealant layer surface of a base film (21) can use preferably the easily peelable provision layer (22). As specific materials, resins such as ethylene / vinyl acetate copolymer (EVA), ethylene / methyl methacrylate copolymer (EMAA), and ionomer are used as a main component in combination of at least one or two or more. It is also possible to control the peel strength by adding a tackifier.

  The barrier film (23) is oxidized on a film similar to the barrier film (11) of the front film, that is, an oriented film such as an aluminum foil, a uniaxially or biaxially stretched polyester film, a polyamide film or a polyolefin film. An inorganic compound vapor-deposited plastic film in which a thin film of an inorganic compound such as aluminum or silicon oxide is formed to a thickness of about 20 to 100 nm by a vapor deposition method such as physical vapor deposition or chemical vapor deposition, a stretched polypropylene film or a nylon film thinly coated with vinylidene chloride resin A generally known film having excellent gas barrier properties and water vapor barrier properties, such as, can be preferably used. It is the same as the barrier film (11) of the front film that a multilayer structure of two or more layers may be used.

  The base film (21), the easily peelable layer (22), and the barrier film (23) are bonded to the surface of the base film (21) opposite to the sealant layer and the barrier film (23) surface. Can be carried out by extruding and applying an easily peelable resin that becomes the easily peelable layer (22) by the melt extrusion method.

  In that case, the adhesive strength between a base film (21) and an easily peelable provision layer (22) must be the intensity | strength which can be easily peeled by hand at the time of use. Specifically, a range of 0.5 to 5 N / 15 mm is desirable. When the strength is 5N or more, it is difficult to open, and when it is less than 0.5N, the barrier film is peeled off during transportation or the like and heat is not generated.

  The sealant layer surface of the front film (10) thus produced and the sealant layer surface of the base film (21) in which the through holes (24) of the back film (20) are made to face each other, and a heating element therebetween A four-sided seal bag having a desired size was formed by sandwiching (H), and the used warmer of the present invention as shown in FIG. 3 could be produced.

Since this used warmer is wrapped with a barrier film, it does not generate heat during distribution. In use, the through-hole formed in the base film is exposed by peeling off the barrier film on the back film, and oxygen in the atmosphere reacts with the heating element of the warmer to generate heat.

  Hereinafter, the present invention will be described in detail by way of examples.

  First, a nylon film (KNy) coated with vinylidene chloride having a thickness of 15 μm to a thickness of 3 μm, and a linear low density polyethylene film (VMLDPE) (Hitapacs) in which a thin film of an inorganic compound having a thickness of 25 μm is deposited to a thickness of about 40 nm. (Manufactured by Hitachi AC Co., Ltd.) and dry lamination processing, and the linear low-density polyethylene (LLDPE) resin is processed into a laminate with a thickness of 20 μm on the PE surface of VMLLDPE, and KNy (15 μm) / VMLDDPE (25 μm) / A front film (10) having a layer configuration of LLDPE (20 μm) was produced.

  Next, a stretched nylon film (ONy) having a thickness of 15 μm and a VMLDPPE having a thickness of 25 μm are dry-laminated, and an LLDPE resin is processed to a laminate surface of 20 μm on the PE surface of the VMLDPE by ONy (15 μm). ) / VMLDPPE (25 μm) / LLDPE (20 μm) layered composite film was produced.

  The ONy is provided with a printing layer (not shown) in advance, and at the same time, when it is made into a four-side sealed bag, a stripping varnish layer mainly composed of polyethylene wax (25) is formed on one edge. ) Is formed to a thickness of about 0.1 to 3 μm by gravure printing.

  On the entire surface of the composite film, a large number of small holes to through holes (24) having a size that does not spill the heating element were formed by electric discharge machining to obtain a base film (21).

  An ONy surface of this base film (21) and a biaxially oriented polypropylene film (KOP) having a thickness of 20 μm prepared by applying vinylidene chloride resin to a thickness of 3 μm prepared as a barrier film (23) via EMAA Extruder lamination was performed to produce a back film (20) having a layer structure of LLDPE (20 μm) / VMLDDPE (25 μm) / ONy (15 μm) / EMAA (15 μm) / KOP (20 μm).

  A large number of through holes (24) are formed on the entire surface of the base film, and a release varnish layer (25) is formed on the edge of the ONy.

  Finally, the LLDPE surface that is the sealant layer of the front film (10) and the LLDPE surface that is the sealant layer of the back film (20) are opposed to each other, and a predetermined amount of the heating element (H) is sandwiched between them. The bag was made into a four-sided seal bag, and a used warmer was prepared using the warmer packaging material of Example 1.

  A composite film having the same configuration as that of Example 1 was used as the front film (10).

A composite film having the following layer structure was produced as the base film (21) of the back film (20). That is, ONy having a thickness of 15 μm and VMLDPE having a thickness of 25 μm are dry-laminated, and a large number of through-holes that do not spill the heating element are formed to form a base film (21). As in Example 1, the ONy is provided with a printing layer (not shown) in advance, and at the same time, when it is made into a four-side seal bag, a polyethylene wax in the form of a belt is formed as a main component at one edge. The peeling varnish layer (25) to be formed is formed to a thickness of about 0.1 to 3 μm by a gravure printing method.

  The ONy surface of the base film (21) and KOP having a thickness of 20 μm prepared as a barrier film (23) were processed by extruder lamination via EMAA, and LLDPE (20 μm) / ONy (15 μm) / EMAA ( A back film (20) having a layer structure of 15 μm) / KOP (20 μm) was produced.

  As in Example 1, a large number of through holes (24) are formed on the entire surface of the base film, and a peeling varnish layer (25) is formed on the edge of ONy.

  Finally, the LLDPE surface which is the sealant layer of the front film (10) and the LLDPE surface which is the sealant layer of the back film (20) are opposed to each other, and a desired amount of the heating element (B) is sandwiched therebetween. The bag was made into a four-sided seal bag, and a used warmer using the warmer packaging material of Example 2 was produced.

  Since both the hand warmers of Example 1 and Example 2 are packaged with a barrier film, they do not generate heat during distribution. In use, the through-hole formed in the base film is exposed by peeling off the barrier film on the back film, and oxygen in the atmosphere reacts with the heating element of the warmer to generate heat.

It is sectional explanatory drawing which shows one Example of the front side film used for the packaging material for used warmers of this invention. It is sectional explanatory drawing which shows one Example of the back side film used for the packaging material for used hand warmers of this invention. An example of the hand warmer of the present invention is shown, (a) is a perspective explanatory view, (b) is a cross-sectional explanatory view taken along the line A-A 'of (a). It is sectional explanatory drawing which shows one Example in the use condition of the used hand warmer of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Four-sided seal bag 2 ... Seal part 10 ... Front side film 11 ... Barrier film 12 ... Sealant layer 20 ... Back side film 21 ... Base film 22 ... Easily peelable layer 23 ... Barrier Film 24 ... Through hole 25 ... Peeling varnish layer B ... Heating element

Claims (2)

In the packaging material for hand warmers that stores a heating element that generates heat by reacting with oxygen in the atmosphere,
The packaging material for warmers is a four-side sealed bag formed by superimposing a front film and a back film and sealing the periphery thereof,
The front side film has a configuration in which a barrier film is used as a base material and a sealant layer is laminated on at least an inner surface,
The back film has a structure in which a base film having a large number of through holes, an easily peelable layer, and a barrier film are sequentially laminated,
A packaging material for hand warmers, wherein a peeling varnish layer is formed on one edge of the base film between the base film of the back film and the easily peelable layer.   The used hand warmer packaged with the packaging material for used hand warmers according to claim 1.

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