JP5087315B2 - Disposable body warmers - Google Patents

Description

  The present invention relates to a disposable warmer bag member used for manufacturing a paste-type disposable warmer. Moreover, it is related with the disposable body warmer which does not use the release paper which uses this.

  Currently, disposable warmers of the pasting type (sticking type heating element) are widely used regardless of the season for the purpose of simple heating means in winter and prevention of cooling in the cooling environment in summer (for example, (See Patent Documents 1 to 4). Such pasted disposable warmers are used, for example, by attaching them to clothing such as socks and underwear; footwear such as shoes; and skin.

  As a structure of a conventional general disposable body warmer, for example, a structure as shown in FIG. Specifically, two types of bag body constituent members (bag body constituent member 1 and bag body constituent member 2) are formed into a bag body using heat sealing means, and iron powder or the like is mainly contained inside the bag body. The heating element component 3 is sealed. The bag member 1 is formed of, for example, a heat seal layer 1a and a plastic sheet 1b. Further, an adhesive layer 1c is formed on one surface of the bag body constituting member 1 on one side. Furthermore, the pressure-sensitive adhesive layer 1c is sold in a state protected by a release paper (separator) 4 (that is, a state where the release paper is bonded to the surface of the pressure-sensitive adhesive layer).

  Since such disposable warmers are used by peeling off the release paper at the time of use, the release paper becomes dust and has an environmental problem.

Japanese Patent Laid-Open No. 11-19113 JP 2002-36471 A JP 2006-288690 A JP 2006-288691 A

  The object of the present invention is to eliminate the need for using a release paper for protecting the pressure-sensitive adhesive layer. Disclosed is a disposable body warmer that does not use a release paper.

  As a result of intensive studies to achieve the above object, the inventors of the present invention have produced an adhesive layer and a release treatment layer by applying them directly on a substrate in an arrangement that overlaps when folded. In the case of a disposable body warmer, it is possible to protect the pressure-sensitive adhesive layer without using release paper, and the bag body constituting member for the disposable body warmer satisfying usability such as adhesiveness and peelability. And it discovered that a disposable body warmer was obtained and completed this invention.

That is, the present invention provides a disposable warmer bag component, characterized in that the pressure-sensitive adhesive layer and the release treatment layer are provided so as to overlap each other when folded, and are directly applied onto a substrate. A disposable body warmer formed by using a pressure-sensitive adhesive layer and a release treatment layer provided on a porous film or non-woven fabric, respectively, among the base material, and other than a portion in which a heating element is enclosed A disposable body warmer that does not use release paper and is capable of overlapping the adhesive layer and the release treatment layer by folding is provided.

Furthermore, the present invention provides the disposable warmer described above, wherein the pressure-sensitive adhesive layer is composed of a styrene-based elastomer or an acrylic urethane-based hot-melt pressure-sensitive adhesive.

Furthermore, the present invention provides the disposable warmer , wherein the release treatment layer is composed of a solvent-free active energy ray-curable silicone release treatment agent.

Furthermore, this invention provides the said disposable body warmer whose base material is a laminated body of a nonwoven fabric and a porous film.
Furthermore, the present invention is formed by heat-sealing the disposable warmer bag member and the other disposable warmer bag member, and encapsulating a heating element inside the bag member. Provide disposable warmers.

  Since the disposable body bag component of the present invention can be folded to overlap the release treatment layer on the pressure-sensitive adhesive layer, there is no need to use separate release paper. For this reason, since waste of release paper does not occur when using a warmer, it is excellent in terms of environment. Furthermore, since the pressure-sensitive adhesive layer and the release treatment layer are directly applied on the substrate, the anchoring properties of these layers are good, and in addition, productivity is improved. For this reason, such a disposable warmer bag member is industrially beneficial.

[Cairo body component]
The disposable warmer bag member of the present invention (hereinafter sometimes simply referred to as “bag member”) is a member that forms a bag for enclosing a heating element in the disposable warmer. The bag body constituting member in the present invention is a member used as an adherend side (hereinafter also referred to as “inside”) when a disposable body warmer is attached to an adherend, and a side opposite to the adherend (hereinafter, “ Any of the members used as “outside” may be used.

  An example (schematic cross-sectional view) of the most basic configuration of the bag constituting member of the present invention is shown in FIG. As for the bag structural member of this invention, the adhesive layer 5 and the peeling process layer 6 are provided on the base material 7 (FIG. 2 a). In the present invention, the pressure-sensitive adhesive layer 5 and the release treatment layer 6 need to be provided so as to overlap each other by folding the bag-constituting member (FIG. 2b). With such a structure, when a disposable body warmer is manufactured using the above-described bag member, the pressure-sensitive adhesive layer is folded and overlapped with the release treatment layer until the body warmer is applied. Thus, the pressure-sensitive adhesive layer can be protected without using a separate release paper (FIG. 2b). For this reason, the release paper is not generated as dust during use, which is preferable in terms of environment. The “overlapping” may be a structure in which the pressure-sensitive adhesive layer is substantially covered with the release treatment layer. For example, when folded, 90% or more of the surface area of the pressure-sensitive adhesive layer is peeled off. What is necessary is just to be covered with a process layer. The release treatment layer may be provided wider than the pressure-sensitive adhesive layer.

  In the present invention, the shape, arrangement, and number of the pressure-sensitive adhesive layer and the release treatment layer are not particularly limited as long as the pressure-sensitive adhesive layer and the release treatment layer are provided so as to overlap each other by folding. For example, it may be formed in a stripe shape using stripe coating and in a dot shape using dot coating. The position where the pressure-sensitive adhesive layer and the release treatment layer are provided is not particularly limited, but from the viewpoint of ensuring the breathability of the base material and from the viewpoint of reducing the burden on the skin in the case of a disposable body warmer that is directly attached to the skin. The pressure-sensitive adhesive layer and the release treatment layer are preferably formed in a portion other than a portion in which the heating element is encapsulated (hereinafter sometimes referred to as “heating element enclosing portion”). Since the heating element enclosing part is generally often provided at the central part of the disposable body warmer, the pressure-sensitive adhesive layer and the release treatment layer are particularly preferably formed at the end of the disposable body warmer (for example, FIG. 6, FIG. 7 and FIGS. 10 to 12).

  The example (schematic sectional drawing) of arrangement | positioning of an adhesive layer and a peeling process layer is shown to FIGS. The pressure-sensitive adhesive layer and the release treatment layer may be provided alternately, for example, in a striped shape (FIG. 3). Moreover, the adhesive layer and the peeling process layer may be provided in the surface on the opposite side with respect to a base material (FIG. 4). Furthermore, the number of the pressure-sensitive adhesive layer and the release treatment layer may be different (FIG. 5).

  The base material used for the bag-constituting member of the present invention may have a single layer structure, or may have a single layer or a multilayer structure composed of different members. Moreover, any of a porous base material and a non-porous base material may be sufficient. When a porous substrate is used, effects such as air permeability and oxygen supply to the heating element can be obtained.

  The substrate is preferably composed of, for example, a heat seal layer, a fiber layer (for example, a nonwoven fabric layer), a film layer, or the like. More specifically, examples of the substrate include a laminate of a heat seal layer (including a heat sealable film layer) and a fiber layer, a laminate of a heat seal layer and a film layer having no heat sealability, and the like. It is done. Among the above, as a laminated body of a nonwoven fabric and a porous film (porous heat seal layer), for example, a polyethylene-based porous film laminated with a nylon nonwoven fabric (nylon nonwoven fabric) (for example, Nitto Lifetech Co., Ltd.) ) And trade name “BRESLON” etc. are preferably used.

  The non-woven fabric in the non-woven fabric layer is not particularly limited. For example, a non-woven fabric made of nylon (polyamide non-woven fabric), a non-woven fabric made of polyester, a non-woven fabric made of polyolefin, a non-woven fabric made of rayon, etc. Nonwoven fabric etc. can be used. In addition, the nonwoven fabric may have any form of a single layer or a multilayer. In the nonwoven fabric, the fiber diameter, fiber length, basis weight, etc. are not particularly limited. A nonwoven fabric may be comprised only from 1 type of fiber, and may be comprised combining multiple types of fiber.

  The heat seal layer can be formed of a heat sealable resin composition containing a heat sealable resin (heat sealable resin). Such a heat-sealable resin is not particularly limited, but an olefin resin can be suitably used. As an olefin-based resin, at least an olefin component (an α-olefin such as ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methyl-pentene-1, heptene-1, octene-1, etc.) is a monomer. If it is resin used as a component, there will be no restriction | limiting in particular. Specifically, as the olefin resin, for example, low density polyethylene, linear low density polyethylene (linear low density polyethylene), medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-α -In addition to ethylene resins such as olefin copolymers (for example, ethylene-propylene copolymers), propylene resins (polypropylene, propylene-α-olefin copolymers, etc.) and polybutene resins (polybutene-1, etc.) ), Poly-4-methylpentene-1, and the like. Examples of the olefin resin include ethylene-unsaturated carboxylic acid copolymers such as ethylene-acrylic acid copolymers and ethylene-methacrylic acid copolymers; ionomers; ethylene-methyl acrylate copolymers, ethylene- Ethylene- (meth) acrylic acid ester copolymers such as ethyl acrylate copolymer and ethylene-methyl methacrylate copolymer; ethylene-vinyl alcohol copolymer and the like can also be used. As the olefin resin, ethylene resin is preferable, and among them, low density polyethylene, linear low density polyethylene, and ethylene-α-olefin copolymer are preferable.

  In the ethylene-α-olefin copolymer, the α-olefin is not particularly limited as long as it is an α-olefin other than ethylene. For example, propylene, butene-1, pentene-1, hexene-1, 4-methyl -Α-olefins having 3 to 10 carbon atoms such as pentene-1, heptene-1, octene-1 and the like. Accordingly, examples of the ethylene-α-olefin copolymer include an ethylene-propylene copolymer and an ethylene- (butene-1) copolymer. Moreover, as an alpha olefin in the propylene-alpha-olefin copolymer which concerns on an olefin resin, it can select from the C4-C10 alpha olefin suitably, for example.

  The heat-sealable resins can be used alone or in combination of two or more.

  Among the above, as the heat-sealable resin composition, an olefin-based resin composition containing at least an ethylene-α-olefin copolymer as the olefin resin is suitable, and in particular, low-density polyethylene and / or linear low-density. An olefin resin composition containing polyethylene and an ethylene-α-olefin copolymer can be suitably used. In an olefin resin composition containing at least an ethylene-α-olefin copolymer, or an olefin resin composition containing low-density polyethylene and / or linear low-density polyethylene and an ethylene-α-olefin copolymer. The content ratio of the ethylene-α-olefin copolymer is not particularly limited, and is, for example, 5% by weight or more (preferably 10 to 50% by weight, more preferably 15 to 40% by weight based on the total weight of the olefin resin. %) Can be appropriately selected.

  In order to perform high-speed processing by performing heat sealing at a lower temperature, it is effective to use a heat-sealable resin having a lower melting point. For this purpose, for example, low-density polyethylene prepared using a metallocene catalyst Is the most effective.

  The heat seal layer may have either a single layer or a multiple layer form.

  As the heat seal layer, a porous heat seal layer (for example, a heat seal layer made of a porous film) is preferable from the viewpoints of air permeability and oxygen supply to the heating element components. Therefore, as the heat seal layer, a heat seal layer made of a polyolefin-based porous film (particularly, a polyethylene-based porous film) is suitable.

  As the film layer, a conventionally used film layer can be used. As resin which forms a film layer, a polyester-type resin, an olefin resin, etc. can be used, for example. Among these, from the viewpoint of price and flexibility, an olefin resin can be preferably used. As the olefin-based resin, it is possible to use a resin similar to the resin exemplified in the heat seal layer.

  The film layer may be a single layer film or a laminated film having two or more layers. Further, the film may be a non-oriented film or a film stretched and oriented in a uniaxial or biaxial direction, but is preferably a non-oriented film.

  In order to conceal the film, a filler (for example, titanium white) may be added. Specifically, for example, a filler (for example, titanium white) is added to the intermediate layer of the multilayer film. May be.

  The thickness in particular of a base material is not restrict | limited, For example, it is about 10-500 micrometers (preferably 12-200 micrometers, More preferably, it is about 15-100 micrometers). The base material may be subjected to various treatments such as back treatment and antistatic treatment as necessary.

  The pressure-sensitive adhesive layer in the bag constituting member of the present invention plays a role of sticking a body warmer to an adherend during use. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited. For example, a rubber-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive (acrylic urethane-based pressure-sensitive adhesive), an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, Known pressure-sensitive adhesives such as polyamide-based pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, and fluorine-based pressure-sensitive adhesives can be used. Moreover, the said adhesive can be used individually or in combination of 2 or more types. Among these, rubber-based and urethane (acrylic urethane) pressure-sensitive adhesives are particularly preferable.

  Examples of the rubber-based pressure-sensitive adhesive include rubber-based pressure-sensitive adhesives using natural rubber and various synthetic rubbers as a base polymer. Examples of rubber adhesives based on synthetic rubber include styrene / butadiene (SB) rubber, styrene / isoprene (SI) rubber, styrene / isoprene / styrene block copolymer (SIS) rubber, styrene / butadiene / Styrene block copolymer (SBS) rubber, Styrene / ethylene / butylene / styrene block copolymer (SEBS) rubber, Styrene / ethylene / propylene / styrene block copolymer (SEPS) rubber, Styrene / ethylene / isoprene / styrene block Copolymer (SIPS) rubber, styrene rubber (also called styrene elastomer) such as styrene / ethylene / propylene block copolymer (SEP) rubber, polyisoprene rubber, recycled rubber, butyl rubber, polyisobutylene, and their modifications Body And the like. Of these, styrene elastomer pressure-sensitive adhesives are preferable, and SIS and SBS are more preferable. These 1 type or 2 or more types of mixtures can be selected suitably, and can be used.

  As the urethane-based pressure-sensitive adhesive, known and commonly used urethane-based pressure-sensitive adhesives can be used, and are not particularly limited. For example, the urethane-based pressure-sensitive adhesives exemplified in Japanese Patent No. 3860880 and Japanese Patent Application Laid-Open No. 2006-288690. An agent or the like can be preferably used. Among these, an acrylic urethane pressure-sensitive adhesive composed of isocyanate / polyester polyol is preferable. Moreover, it is preferable that the said acrylic urethane type adhesive is a foaming type adhesive which has a bubble from a viewpoint of reducing the irritation | stimulation to the skin at the time of sticking directly on skin. Such a foaming type pressure-sensitive adhesive can be produced by, for example, a method of adding a known and usual foaming agent to the pressure-sensitive adhesive.

  The pressure-sensitive adhesive may be any pressure-sensitive adhesive, and examples thereof include an emulsion-type pressure-sensitive adhesive, a solvent-type pressure-sensitive adhesive, and a hot-melt-type pressure-sensitive adhesive (hot-melt-type pressure-sensitive adhesive). . Among the above, the coating can be performed by melting with heat without using a solvent, and the coated surface (surface on which the pressure-sensitive adhesive layer is formed) has a porous surface (for example, a porous film or A hot-melt adhesive (hot melt adhesive) is particularly preferred because it can be applied directly to a porous surface to form a pressure-sensitive adhesive layer.

  Further, the pressure-sensitive adhesive may be any pressure-sensitive adhesive, for example, a pressure-sensitive pressure-sensitive adhesive (thermosetting pressure-sensitive adhesive) that cures by crosslinking or the like caused by heating. ), And a pressure-sensitive adhesive having active energy ray curability that cures by crosslinking or the like caused by irradiation with active energy rays (active energy ray-curable pressure-sensitive adhesive). Among these, an active energy ray-curable pressure-sensitive adhesive is suitable because it is solvent-free and does not excessively impregnate non-woven fabrics or porous substrates. For the thermosetting pressure-sensitive adhesive, a crosslinking agent, a polymerization initiator, or the like for exhibiting thermosetting properties is appropriately used. For the active energy ray-curable pressure-sensitive adhesive, a cross-linking agent or a photopolymerization initiator for exhibiting active energy ray curability is appropriately used.

  The release treatment layer in the bag constituting member of the present invention plays a role of protecting the pressure-sensitive adhesive layer until use. The release treatment agent (release agent) constituting the release treatment layer is not particularly limited, and preferred examples include silicone release treatment agents, fluorine release treatment agents, and long-chain alkyl release treatment agents. Of these, silicone release agents are particularly preferable.

  As the silicone release agent, a solvent-free silicone release agent is preferable from the viewpoint of not being impregnated excessively even when it is provided on a porous substrate such as a nonwoven fabric. Examples of such a solventless silicone release treatment agent include a thermosetting silicone release treatment agent and an active energy ray curable silicone release treatment agent. Among these, from the viewpoint of not causing thermal damage when used for a porous film, an active energy ray-curable silicone-based release treatment agent is particularly preferable. The solventless silicone-based release treatment agents can be used alone or in combination of two or more. As the silicone-based release treating agent, for example, a silicone-based release treating agent disclosed in JP-A-2006-291112 can be used.

  The active energy ray-curable silicone release treatment agent may be a type of silicone release treatment that is cured by active energy rays (α rays, β rays, γ rays, neutron rays, electron beams, ultraviolet rays, etc.). Although it does not restrict | limit in particular, The peeling processing agent of the type which hardens | cures by the bridge | crosslinking (curing reaction) by electron beam or ultraviolet irradiation, and forms a peelable film can be used suitably. The active energy ray-curable silicone-based release treatment agent can be used alone or in combination of two or more.

  Examples of the silicone-based release treatment agent that can be cured by ultraviolet irradiation include a cationic polymerization type that cures by cationic polymerization, a radical polymerization type that cures by radical polymerization, a radical addition type that cures by radical addition polymerization, and hydrosilylation. A release treatment agent such as a hydrosilylation reaction type that cures by reaction can be used. Among these, a cationic polymerization type is preferable.

  As such a release treatment agent, a commercially available product can be used, and for example, “UV-9300” manufactured by Toshiba Silicone Co., Ltd. can be used.

  In the bag constituting member of the present invention, the pressure-sensitive adhesive layer and the release treatment layer need to be provided by directly applying the pressure-sensitive adhesive and the release treatment agent onto a substrate. For example, when providing a pressure-sensitive adhesive layer by applying a double-sided pressure-sensitive adhesive sheet (double-sided pressure-sensitive adhesive tape) or when providing a release treatment layer by applying a pressure-sensitive adhesive sheet that has been subjected to release treatment on one side, the double-sided pressure-sensitive adhesive sheet is a separate process. Therefore, the number of processes increases and productivity decreases, and the process film becomes garbage, which is not preferable from the environmental viewpoint. Moreover, the anchoring property with respect to a nonwoven fabric base material or a porous film base material may fall.

  The pressure-sensitive adhesive layer and the release treatment layer are preferably provided on the porous layer (for example, on the porous film layer) or the fiber layer (particularly on the nonwoven fabric) among the base materials. In particular, it is preferable that the solventless hot-melt (hot-melt) pressure-sensitive adhesive and the active energy ray-curable silicone-based release treatment agent are applied on the nonwoven fabric or the porous film. By applying a solvent-free pressure-sensitive adhesive or release treatment agent on the nonwoven fabric or porous film, the pressure-sensitive adhesive or release treatment agent is appropriately impregnated into the nonwoven fabric or porous film. It can be exerted, and the adhesive property and peeling property are improved. In addition, when using solvent-based adhesives and release treatment agents, it is necessary to apply a large amount because it is too impregnated into the nonwoven fabric or porous film. May be difficult.

  When applying the pressure-sensitive adhesive and the release treatment agent on the substrate, known or conventional coating methods such as a roll coating method, a die coating method, a gravure coating method, a bar coating method, a melt blow or curtain spray method, etc. An appropriate coating method can be used.

An appropriate coating amount (solid content) can be appropriately selected according to the type of the pressure-sensitive adhesive or the release treatment agent, the type of the base material, etc. For example, if it is a pressure-sensitive adhesive, 10 to 300 g / m. is ² mm, preferably from 50 to 150 g / m ^2, if the release agent is 0.03~3g / m ² approximately, and preferably from 0.3 to 1.5 g / m ^2.

  The coating layer of the pressure-sensitive adhesive and release treatment agent varies depending on the type of the pressure-sensitive adhesive and release treatment agent, and is not particularly limited, but is subjected to drying, heat curing, and active energy ray curing treatment. The method for heating the coating layer when it is dried or thermally cured is not particularly limited, and may be a known heating method (for example, a heating method using an electric heater, a heating method using an electromagnetic wave such as infrared rays). It can be appropriately selected and employed. Further, the method of irradiating the active energy ray when curing the active energy ray is not particularly limited, and a known method (for example, an electroded high-pressure mercury lamp, an ozone-less lamp, a metal halide lamp, an electrodeless microwave lamp, etc. And the like can be appropriately selected and employed.

  The thickness of the pressure-sensitive adhesive layer (thickness after drying or curing) is preferably 10 to 200 μm, more preferably about 15 to 100 μm, from the viewpoints of adhesive strength and cost. The thickness (the thickness after drying or curing) of the release treatment layer is preferably 0.03 to 3.0 μm, more preferably about 0.3 to 1.5 μm from the viewpoint of cost and the like.

  The bag constituting member of the present invention may be provided with a slit from the viewpoint of improving stretchability, dispersing stress to prevent peeling, breathability during use, and releasing sweat.

[Disposable body warmer]
The bag body constituting member of the present invention and another bag body constituting member such as a porous film are heat sealed to form a bag body, and the heating element is enclosed in the bag body, thereby forming the disposable body warmer of the present invention. be able to. 6 and 7 are schematic sectional views showing an example of the disposable body warmer of the present invention. 8 and 9 are schematic cross-sectional views showing a state in which the end portion is folded and the pressure-sensitive adhesive layer 5 and the release treatment layer 6 are overlapped. As a structure of the disposable body warmer of the present invention, for example, a structure using the bag body constituting member 8 of the present invention as an outer member of the body warmer (FIGS. 6, 8, and 9) or a structure used as an inner member of the body warmer (FIG. Any of 7) may be used.

  It does not specifically limit as another bag body structural member bonded together with the bag body structural member of this invention, For example, a well-known bag body structural member can be used, For example, it uses for the bag body structural member of this invention. A member having the same structure as the base material to be used can be used.

  The same effect as that of the disposable body warmer of the present invention can be obtained by laminating the bag member having only the pressure-sensitive adhesive layer and the bag member having only the release treatment layer, but the cost and productivity can be obtained. From the viewpoint of

The formation of the bag body in the disposable body warmer of the present invention is performed, for example, by heat-sealing so that the bag body constituting member and the other bag body constituting member face each other and become a bag body. At this time, it is preferable that the layers made of heat-sealable resin face each other. The method (apparatus) for heat sealing is not particularly limited, but pressure bonding with a heat sealer is preferable. The heat seal temperature at that time is preferably 90 to 250 ° C, more preferably 130 to 200 ° C. The pressure is preferably 0.5 to 30 kg / cm ² , more preferably 2.0 to 10 kg / cm ² . Moreover, 0.02-1.0 second is preferable from a viewpoint of productivity, and, as for heat-sealing time, More preferably, it is 0.05-0.5 second.

  The heating element used in the disposable warmer of the present invention can be a heating element used in a conventional disposable warmer, and is not particularly limited. For example, metal powder such as iron powder, activated carbon, water, water retention agent ( Wood powder, vermiculite, diatomaceous earth, perlite, silica gel, alumina, water-absorbing resin, etc.), salt, and the like can be used.

  10 to 12 are schematic views of the disposable warmer of the present invention (the warmer using the bag body constituting member of the present invention as an inner member of the warmer) as viewed from the adherend side. Only one part (heating element enclosing part) 10 for enclosing the heating element may be provided in the disposable body warmer (FIG. 10) or a plurality of parts (FIGS. 11 and 12). .

  Since the disposable body warmer of the present invention is formed using the bag member of the present invention, the pressure-sensitive adhesive layer and the release treatment layer can be overlapped by folding (FIGS. 8 and 9). For this reason, in order to protect an adhesive layer, it is not necessary to use a separate release paper, and since the waste of a release paper does not generate | occur | produce at the time of use, it is preferable from a viewpoint of environmental protection.

  The disposable body warmer of the present invention may be provided with slits (cuts) penetrating in the thickness direction at portions other than the heating element enclosure. Or the slit penetrated in the thickness direction may be provided in either the surface material or back material of this part. By providing the slit, a certain degree of elasticity and flexibility can be obtained by deforming the slit portion. In addition, sweat can be released during use to prevent stuffiness and rash. The slit can be provided, for example, in a linear or perforated form, or in a form in which “C” characters are vertically connected. The position and direction in which the slit is provided vary depending on the purpose of providing the slit and are not particularly limited. For example, the position where the slit is provided may be between the heating element enclosure and the portion where the adhesive layer or the release treatment layer at the end is provided, or when the plurality of heating element enclosures are provided. It may be between adjacent heating element enclosures. Moreover, as a direction which provides a slit, it can provide in the orthogonal direction with respect to the direction which requires a stretching property.

  The disposable warmer of the present invention is stored in an outer bag and sold as a warmer product. The base material constituting the outer bag is not particularly limited, and examples thereof include plastic base materials, fiber base materials (nonwoven fabric base materials and woven base materials made of various fibers), metal base materials (various types). For example, a metal foil-based substrate made of a metal component can be used. As such a base material, a plastic base material can be suitably used. Examples of plastic base materials include polyolefin base materials (polypropylene base materials, polyethylene base materials, etc.), polyester base materials (polyethylene terephthalate base materials, etc.), styrene base materials (in addition to polystyrene base materials). Styrene copolymer base materials such as acrylonitrile-butadiene-styrene copolymer base materials), amide resin base materials, acrylic resin base materials and the like. In addition, the base material for outer bags may be a single layer or a laminate. The thickness in particular of an outer bag is not restrict | limited, For example, 30-300 micrometers is preferable.

  Moreover, it is preferable that the said outer bag has a layer (gas barrier property layer) which has the characteristic (gas barrier property) which blocks | prevents permeation | transmission of gas components, such as oxygen gas and water vapor | steam. Although it does not specifically limit as a gas barrier layer, For example, an oxygen barrier resin layer (For example, a polyvinylidene chloride resin, an ethylene-vinyl alcohol copolymer, polyvinyl alcohol, a polyamide resin), a water vapor barrier resin layer (For example, a polyolefin resin, a polyvinylidene chloride resin), an oxygen barrier property or a water vapor barrier inorganic compound layer (for example, a metal simple substance such as aluminum, a metal oxide such as a metal oxide such as silicon oxide or aluminum oxide) Etc.). The gas barrier layer may be a single layer (or the outer bag base material itself) or a laminate.

  The outer bag may be in any form or structure, for example, a so-called “four-side bag”, a so-called “three-side bag”, a so-called “pillow bag”, a so-called self-supporting type bag (a so-called “standing bag”). Pouches)) and so-called “gusset bags”. Among these, a four-sided bag is particularly preferable. The outer bag may be produced using an adhesive, but is preferably produced by heat sealing (thermal fusion) such as a four-way heat sealing bag.

  Since the disposable body warmer of the present invention has an adhesive layer, it is preferably used as a disposable body warmer that is attached to the body, clothing or footwear.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1
[Fabrication of bag components]
As a base material, a polyethylene porous film / nylon nonwoven fabric laminate (manufactured by Nitto Lifetech Co., Ltd., trade name “BRESRON 2360”) was used.
A styrene / isoprene / styrene (SIS) hot melt pressure-sensitive adhesive is applied to the surface of the substrate on the porous film side under a coating temperature of 150 ° C., and a pressure-sensitive adhesive layer (thickness: 80 μm) was formed.
Furthermore, on the same surface as the side where the pressure-sensitive adhesive layer is provided, an ultraviolet curable silicone-based release treatment agent (solvent-free) is applied using a gravure coater, further irradiated with ultraviolet rays, and a release treatment layer ( Thickness: 0.8 μm) was formed.
Folding was performed so that the pressure-sensitive adhesive part (part where the pressure-sensitive adhesive layer was formed) and the release treatment part (part where the release treatment layer was formed) overlapped to obtain the bag member of the present invention. The bag member was configured such that the pressure-sensitive adhesive layer and the release treatment layer overlap each other by folding.

[Production of disposable body warmers]
The bag-constituting member obtained above and a polyethylene laminate nonwoven fabric (a laminate of a polyethylene film and a nylon nonwoven fabric: a nylon spunbond nonwoven fabric (45 g / m ² ) obtained by extruding and laminating polyethylene at a thickness of 50 μm) The polyethylene film surface side and the porous film surface side of the bag-constituting member obtained above were overlapped to face each other, and heat-sealed while enclosing the heating element to produce a disposable body warmer. The above was performed under the condition of scale 4 (180 ° C.) using “Impulse Sealer” manufactured by Fuji Impulse Co., Ltd. In addition, the content of the commercially available body warmer (a mixture containing iron powder as a main component) was used as the heating element. FIG. 13 shows a schematic diagram of the disposable body warmer (a state in which the folding structure is expanded).
Further, the disposable body warmer (with the end folded) is put in an outer bag (using a commercially available body warmer outer bag (a gas barrier film containing PP as a main component)), and the outer bag is also sealed by heat sealing. Cairo products were made.

Example 2
An adhesive layer (thickness: 80 μm) and a release treatment layer (thickness: 1.5 μm) were formed on the nonwoven fabric surface of the polyethylene laminated nonwoven fabric used in Example 1 under the same conditions as in Example 1. Similarly, the bag constituent member of the present invention was obtained.
Subsequently, the laminated body of the polyethylene-based porous film / nylon nonwoven fabric used in Example 1 (trade name “BRESRON” manufactured by Nitto Lifetech Co., Ltd.) used in Example 1 and Similarly, the polyethylene film surface side and the porous film surface side were overlapped so as to face each other, and heat-sealed while encapsulating a heating element to produce a disposable body warmer.
FIG. 14 shows a schematic diagram of the disposable body warmer (a state in which the folding structure is expanded). The dimensions of the disposable body warmer are the same as those in the first embodiment.

  The disposable body warmers obtained in the above examples can be overlapped with the release treatment layer on the pressure-sensitive adhesive layer by folding the end portion, and protect the pressure-sensitive adhesive layer until use without using release paper. It is a disposable warmer that can.

It is a schematic sectional drawing which shows an example of the conventional pasting type disposable body warmer. Schematic cross-sectional view (2a) showing an example of the bag body constituting member for the disposable body warmer of the present invention, and schematic cross-sectional view (2b) showing a state in which one end is folded and the adhesive layer and the release treatment layer are overlapped It is. It is a schematic sectional drawing which shows another example of the bag body structural member for disposable warmers of this invention. It is a schematic sectional drawing which shows another example of the bag body structural member for disposable warmers of this invention. It is a schematic sectional drawing which shows another example of the bag body structural member for disposable warmers of this invention. It is a schematic sectional drawing which shows an example of the disposable body warmer using the bag body structural member for disposable warmers of this invention as an outer bag body structural member. It is a schematic sectional drawing which shows an example of the disposable body warmer using the bag body structural member for disposable body warmers of this invention as an inner bag body structural member. It is a schematic sectional drawing which shows the state which folded the edge part of the disposable body warmer using the bag body structural member for disposable body warmers of this invention, and overlap | superposed the adhesive layer and the peeling process layer. It is a schematic sectional drawing which shows the state which folded the edge part of the disposable body warmer using the bag body structural member for disposable body warmers of this invention, and overlap | superposed the adhesive layer and the peeling process layer. It is the schematic seen from the to-be-adhered body side which shows an example of the disposable warmer (the warmer which has only one heating element enclosure part) using the bag body structural member for disposable warmers of this invention. It is the schematic seen from the to-be-adhered body side which shows an example of the disposable warmer (the warmer which has several heat generating body enclosure parts) using the bag body structural member for disposable warmers of this invention. It is the schematic seen from the to-be-adhered body side which shows another example of the disposable warmer (the warmer which has several heat generating body enclosure parts) using the bag body structural member for disposable warmers of this invention. It is the schematic sectional drawing (FIG. 13a) of the disposable body warmer produced in Example 1, and the schematic plan view seen from the to-be-adhered body side (FIG. 13b). It is a schematic sectional drawing of the disposable body warmer produced in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag body member 1a Heat seal layer 1b Plastic sheet 1c Adhesive layer 2 Bag body member 3 Heat generating body 4 Release paper (separator)
DESCRIPTION OF SYMBOLS 5 Adhesive layer 6 Peeling process layer 7 Base material 8 Bag body structural member 9 Other bag body structural member 10 Heating body enclosure part 11 Heat seal part 12 End part 13 Nylon nonwoven fabric 14 Polyethylene porous film 15 Nylon nonwoven fabric 16 Polyethylene film

Claims (5)

The pressure-sensitive adhesive layer and the release treatment layer are formed by using a bag body component for disposable body warmers, which is provided by being applied directly on a base material in an arrangement that overlaps when folded. A disposable body warmer,
The pressure-sensitive adhesive layer and the release treatment layer are respectively provided on the porous film or the nonwoven fabric among the base materials, and are formed in a portion other than the portion where the heating element is enclosed,
Disposable body warmer that does not use release paper, and can overlap the adhesive layer and release treatment layer by folding. The disposable body warmer according to claim 1, wherein the pressure-sensitive adhesive layer is composed of a styrene-based elastomer or an acrylic urethane-based hot-melt pressure-sensitive adhesive. The disposable body warmer according to claim 1 or 2, wherein the release treatment layer comprises a solvent-free active energy ray-curable silicone release treatment agent. The disposable body warmer according to any one of claims 1 to 3, wherein the substrate is a laminate of a nonwoven fabric and a porous film. Any one of Claims 1-4 formed by heat-sealing the said bag body structural member for disposable warmers and the bag body structural member for other disposable warmers to make a bag body, and enclosing a heat generating body inside the bag body The disposable body warmer of Claim 1.

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