JP4881790B2 - Disposable body warmer - Google Patents

Description

  The present invention relates to a disposable body warmer constituting member for use in the manufacture of a paste-type disposable warmer and a disposable warmer using the bag body constituting member. Moreover, it is related with those manufacturing methods.

  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 10). 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. Examples of the bag-constituting member include (i) a member obtained by laminating a nonwoven fabric layer on a porous film substrate having air permeability, and (ii) a nonwoven fabric layer laminated on a non-breathable film substrate having heat sealability. The member etc. are used and the bag body is formed by heat-sealing these (i) and (ii). In the above (i) and (ii), the film substrate and the nonwoven fabric layer are firmly bonded with an adhesive.

  However, in recent years, the required characteristics of disposable body warmers have increased, and further improvements in the texture and feel of the bag have been demanded.

Japanese Patent Laid-Open No. 10-314208 Japanese Patent Laid-Open No. 10-328224 JP 2000-42021 A JP 2000-126217 A JP 2000-288008 A JP 2001-260293 A JP 2002-36471 A JP 2002-85442 A Japanese Patent Laid-Open No. 2002-113819 JP 2002-127316 A

  The objective of this invention is providing the bag body structural member for manufacturing the disposable warmer which improved the feel, the touch, and the touch feeling compared with the conventional disposable warmer.

  As a result of intensive studies to achieve the above object, the inventors of the present invention have a texture when using a disposable body warmer by temporarily attaching the film substrate and the nonwoven fabric layer in the laminated structure of the film substrate and the nonwoven fabric layer. The present invention has been completed by finding that a bag body member for discarded body warmers that improves the feel of the skin and the touch and the feel of the hand can be obtained.

That is, the present invention is a laminated member including at least a structure in which a nonwoven fabric layer is laminated on a film substrate , wherein the film substrate and the nonwoven fabric layer are laminated via a hot-melt adhesive, and wherein the disposable warmer bag-constituting member, wherein the film substrate and the nonwoven fabric layer is temporarily attached state, comprising as at least a part of the components of Cairo bag body, wherein the film substrate is the nonwoven fabric layer A disposable body warmer is provided which is located on the inner side of the body for warmer body than the body .

Furthermore, the present invention, the disposable body warmer bag-constituting member, the film substrate on the surface tension is 30~45dyn / cm, the nonwoven fabric layer, adhered by the hot melt adhesive temperature 60 The above-mentioned disposable body warmer which is a bag body constituent member for disposable body warmers manufactured by the method of pasting together on the condition of -100 ° C is provided.

Furthermore, this invention provides the said disposable body warmer whose said film base material is a film base material which has the heat seal layer by a porous film.
Furthermore, the present invention provides the disposable body warmer, wherein the porous film is a polyolefin-based porous film.

Furthermore, the present invention, the is formed by Cairo bag body heat-sealed, in use, the film substrate and the nonwoven fabric layer is peeled off other than heat-sealed portion, and the film substrate of the heat seal portion The nonwoven fabric layer provides the disposable body warmer that does not peel off .
Furthermore, this invention provides the said disposable body warmer whose adhesive force of the said film base material and the said nonwoven fabric layer in the said heat seal part is 3.0 N / 25mm or more.

  Since the disposable warmer bag body component of the present invention has the above-described configuration, the texture and feel of the disposable warmer are good. For this reason, such a disposable warmer bag member is industrially beneficial.

  Below, the bag body constituent member for a disposable body warmer and the disposable body warmer of the present invention will be described in detail with reference to the drawings as necessary.

[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-constituting member in the present invention is a member (also referred to as a backing) used as an adherend side (hereinafter also referred to as “inside”) when a disposable body warmer is attached to an adherend, and an adherend. Any of the members (also referred to as the front material) used as the opposite side (hereinafter also referred to as “outer side”) may be used, and it may be used as both the front material and the back material.

  The bag constituent member of the present invention has at least a laminated structure in which a nonwoven fabric layer is laminated on a film substrate. The film base and the nonwoven fabric layer are preferably bonded together with an adhesive (adhesive layer) (FIG. 2). In addition to the film base material, the nonwoven fabric layer and the adhesive layer, the bag constituting member of the present invention includes an adhesive layer, a release treatment layer, etc. Other layers may be provided.

  The non-woven fabric in the non-woven fabric layer of the bag constituting member of the present invention is not particularly limited. Nonwoven fabrics made of fibers, nonwoven fabrics made of synthetic fibers, etc.) can be used. Moreover, the manufacturing method of a nonwoven fabric is not specifically limited, either, for example, the nonwoven fabric manufactured by the spunbond method (spunbond nonwoven fabric), and the nonwoven fabric manufactured by the spunlace method (spunlace nonwoven fabric) Also good. 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 film base material used for the bag constituent member of the present invention is not particularly limited as long as it is a film-like base material composed of an olefin resin or the like, and may have a single layer structure, or may be single or different. A multilayer structure composed of members may be used. 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 or a film layer. More specifically, examples of the base material include a single-layer base material made of a heat-sealable film and a base material of a laminate of a heat-seal layer and a film layer having no heat-sealability.

  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 suitably from C10-C10 alpha olefins, 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.

  The said film layer can utilize the film layer which consists of a resin film used conventionally. 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 resin, a known and commonly used olefin resin can be used and is not particularly limited. For example, the olefin resin can be selected from the olefin resins exemplified in the description of the heat seal layer. The resin that forms the film layer (for example, an olefin resin) may have heat sealing properties or may be a resin that does not have heat sealing properties. In the case of a layer base material, a heat-sealable resin is preferable from the viewpoint of forming a bag body by heat sealing. When the film substrate is a laminate of a heat seal layer and a film layer, it need not be a heat sealable resin.

  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 film base material is not restrict | limited, For example, 10-500 micrometers (preferably 12-200 micrometers, More preferably, it is about 15-100 micrometers. In addition, a back surface process, Various treatments such as antistatic treatment may be performed.

  In the bag structural member of this invention, the said film base material and the said nonwoven fabric layer need to be laminated | stacked on the temporary attachment state. The “temporarily attached state” refers to a state in which it is sufficiently adhered at the stage of manufacture as a bag constituting member, but can be separated by an external force during manufacture or use of the disposable body warmer. Say. Specifically, the peel force between the film substrate and the nonwoven fabric layer (measured by a T-type peel test under conditions of a tensile speed of 300 mm / min) is 0.2 N / 25 mm or less, preferably 0.1 N / It is 25 mm or less, More preferably, it is 0.0001-0.1N / 25mm. When the film base material and the nonwoven fabric layer are bonded within the range of the above-mentioned peeling force (that is, in a temporarily attached state), the two layers are sufficiently bonded at the time of production and processing of the bag member. Because it is bonded together with force, production and processability are good. On the other hand, the film base material can be reduced by applying an external force during the manufacture of the disposable body warmer, or when using the disposable body warmer (when the heating element generates heat). Since the film base material and the nonwoven fabric layer are peeled off by being in close contact with the heating element or touching or rubbing by the user, the texture and feel (feel of touch) of the nonwoven fabric alone are exhibited. When the peeling force exceeds 0.2 N / 25 mm, the film base material and the nonwoven fabric layer are not peeled even during the production or use of the body, so that the texture and feel of the nonwoven fabric are impaired.

  In the bag-constituting member of the present invention, the method for laminating the film base material and the nonwoven fabric layer is not particularly limited, but it is preferable that both layers are bonded together with an adhesive. The adhesive is not particularly limited, and examples thereof include rubber (natural rubber, styrene elastomer, etc.), urethane (acrylic urethane), acrylic, silicone, polyester, polyamide, epoxy, vinyl alkyl. Known adhesives such as ethers and fluorines can be used. Moreover, the said adhesive agent can be used individually or in combination of 2 or more types. Among these, amide adhesives and polyester adhesives are particularly preferable.

  Further, the adhesive may be an adhesive having any form, and is not particularly limited, but can be applied by melting with heat without using a solvent, However, since it has the advantage that it can be directly applied to form an adhesive layer, a hot melt type (hot melt type) adhesive is particularly preferably exemplified. In addition, by using a hot melt adhesive, the non-woven fabric layer and the film base material are firmly adhered to each other at the time of use because the non-woven fabric layer and the film base material are firmly bonded in the heat-sealed portion (heat seal portion). This is preferable because there is no trouble of separation. When the non-woven fabric layer and the film base material are not bonded together by a hot melt adhesive, it may be necessary to mix heat-sealable fibers into the non-woven fabric in order to maintain the strength of the heat seal portion.

  In addition, as for the adhesive force (peeling force) of the nonwoven fabric layer and film base material in a heat seal part, 3.0 N / 25mm or more is preferable, More preferably, it is 5.0-20.0 N / 25mm.

  That is, the adhesive is preferably an amide or polyester hot melt adhesive, and more preferably a thermoplastic amide or polyester hot melt adhesive.

  The specific method for laminating the film substrate and the nonwoven fabric layer varies depending on the type of adhesive, and is not particularly limited. However, when a hot melt adhesive is used, the nonwoven fabric layer and / or the film substrate is used. The method of bonding both after apply | coating an adhesive agent is mentioned. Especially, after apply | coating a hot-melt-type adhesive agent on a nonwoven fabric layer, the method of bonding a base film is illustrated preferably.

  As the method for applying the adhesive, a known and commonly used application method can be used. For example, when a hot-melt adhesive is used, a publicly known method used as a method for applying the adhesive can be used. Although not particularly limited, for example, a porous film substrate is used as the film substrate. When using, application by spray coating is preferable from the viewpoint of maintaining air permeability. On the other hand, in the case of a non-breathable film substrate, stripe coating or full surface coating may be used in addition to spray coating.

Although the application amount (solid content) of an adhesive agent is not specifically limited, 0.5-20 g / m < ² > is preferable from a viewpoint of the adhesiveness of a heat seal part at the time of bag making, and economical efficiency, More preferably, 1- 8 g / m ² .

  In the bag constituting member of the present invention, from the viewpoint of controlling the peeling force between the film substrate and the nonwoven fabric layer within the above range, the surface tension of the film substrate surface on which the nonwoven fabric layer is bonded (measured in accordance with JIS K6768). ) Is preferably 30 to 45 dyn / cm, more preferably 33 to 40 dyn / cm. If the surface tension of the film substrate exceeds 45 dyn / cm, the film substrate may adhere too strongly, and if it is less than 30 dyn / cm, the adhesive may be repelled. In addition, in order to control to the said surface tension range, it is preferable not to perform the corona treatment etc. which are generally given to a film base material.

  Moreover, 40-110 degreeC is preferable, as for the bonding temperature at the time of bonding a film base material and a nonwoven fabric layer, More preferably, it is 60-100 degreeC, More preferably, it is 60-95 degreeC. The bonding temperature has a great influence on the peeling force between the film substrate and the nonwoven fabric layer. When the temperature is lower than 40 ° C., the peeling force is too low, and the film substrate and the nonwoven fabric layer are peeled off during the manufacturing and processing steps, resulting in productivity. May decrease. On the other hand, when the temperature exceeds 110 ° C., the peel force becomes too high, and the film base material and the nonwoven fabric layer are not peeled off at the stage of producing a warmer or when using a warmer, and the texture and feel may be deteriorated.

  The bag body constituting member of the present invention may be provided with an adhesive layer for attaching a body warmer to an adherend as necessary. The pressure-sensitive adhesive 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-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, a polyamide-based pressure-sensitive adhesive, Known pressure-sensitive adhesives such as epoxy pressure-sensitive adhesives, vinyl alkyl ether 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. Etc. can be used suitably. 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) is a porous surface (for example, a surface made of nonwoven fabric). ), A hot melt pressure sensitive adhesive (hot melt pressure sensitive adhesive) is particularly preferably exemplified from the advantage that a pressure sensitive adhesive layer can be formed by directly applying to a porous surface.

  When applying the pressure-sensitive adhesive on the bag constituting member, a known or conventional coating method, for example, a roll coating method, a die coating method, a gravure coating method, a bar coating method, a melt blow or a curtain spray method, etc. A coating method can be used. For example, the pressure-sensitive adhesive layer may be partially formed in a stripe shape using stripe coating and in a dot shape using dot coating.

The appropriate coating amount (solid content) can be appropriately selected according to the type of pressure-sensitive adhesive, and is, for example, about 10 to ²⁰⁰ g / m ² , preferably 15 to 150 g / m ² .

  The application layer of the pressure-sensitive adhesive varies depending on the type of the pressure-sensitive adhesive and is not particularly limited, but is subjected to drying, heat curing or 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 (thickness after drying or curing) of the pressure-sensitive adhesive layer is preferably 10 to 200 μm, more preferably about 15 to 150 μm, from the viewpoint of adhesive strength, cost, and the like.

  The bag constituting member of the present invention may be provided with slits from the viewpoint of improving stretchability, dispersing stress to prevent peeling, and imparting air permeability and releasing sweat.

[Disposable body warmer]
The bag body constituent member of the present invention and the bag body constituent member of the present invention, or the bag body constituent member of the present invention and another bag body constituent member such as a porous film are heat sealed to form a bag body, and the interior of the bag body The disposable body warmer of the present invention can be formed by enclosing the heating element in the. In addition, it is necessary that at least one of the two bag-constituting members used in the bag has air permeability, and for example, a laminate of a porous film base material and a nonwoven fabric is used. When forming a bag body only from the bag body structural member of this invention, the bag body structural member of this invention is used as both a surface material and a back material. Moreover, when forming a bag body from the bag body structural member of this invention and another bag body structural member, the bag body structural member of this invention is a backing material (the member which becomes an adherend side when attaching) ) Or as a surface material (a member on the side opposite to the adherend when affixed). FIG. 3 shows an example of a disposable body warmer using the bag body component of the present invention as a front material and another bag body material as a backing (an example of a body warmer in which a film base material and a nonwoven fabric layer are temporarily attached). It is a schematic sectional drawing shown. FIG. 5 is a schematic cross-sectional view showing an example of a disposable body warmer using the bag constituent member of the present invention as both a front material and a back material (an example of a warmer in which a film base material and a nonwoven fabric layer are temporarily attached). is there.

  In addition, it does not specifically limit as another bag body structural member bonded together with the bag body structural member of this invention, A well-known bag body structural member can be used, for example, the bag body structural member of this invention It is possible to use a film base material, an adhesive sheet, a laminate of a nonwoven fabric and a heat seal layer, and the like similar to those exemplified as the film base material used in the above.

The formation of the bag body in the disposable body warmer of the present invention is performed, for example, by heat sealing so that one bag body component member and another bag body component member face each other and form 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. In this case, the heat seal temperature is preferably 90 to 250 ° C., more preferably 130 to 200 ° C., from the viewpoint of firmly bonding. 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.

  The disposable warmer of the present invention may be provided with a known or conventional release film (separator) in order to protect the pressure-sensitive adhesive layer until use.

  In the disposable body warmer of the present invention, the bag body constituting member of the present invention is in a state where the film base and the nonwoven fabric layer are peeled off at the stage of use of the body warmer (FIGS. 4 and 6). . For this reason, a nonwoven fabric layer will be in an independent state, and it will be exhibited without impairing the unique texture and feel of the nonwoven fabric layer. When the bag body constituent member of the present invention is used as a backer (inner member) of a warmer, the touch is improved, and when used as a front member (outer member), the texture such as touch and appearance is improved. In addition, since the film base material and the nonwoven fabric layer are firmly bonded to each other by heat sealing at a relatively high temperature, the two layers are not peeled off during the use process, causing trouble.

  As mentioned above, in order to make the film base material and the nonwoven fabric layer of the bag constituting member peeled as described above at the use stage, the film base material and the nonwoven fabric layer are peeled simultaneously in the manufacturing process of the disposable body warmer. Alternatively, the film substrate and the nonwoven fabric layer may be peeled off when the disposable body warmer is used. In the former case (when peeling in the body warming process), at the stage of being sold as a disposable body warmer, the film substrate and the non-woven fabric layer other than the heat-sealed part are already peeled, whereas the latter case In the case of peeling when using a warmer, the film substrate and the non-woven fabric layer remain in a temporarily attached state when selling disposable warmers.

  The method for peeling the film base material and the nonwoven fabric layer in the manufacturing process of the disposable body warmer is not particularly limited. For example, when the bag body constituent member is fed out, a relatively high tension is applied to the bag body constituent member. And a method of heat sealing while peeling the nonwoven fabric layer. In addition, after producing a disposable body warmer by heat sealing in a temporarily attached state, vacuum suction is performed from above the nonwoven fabric layer of the bag constituting member of the present invention, or the nonwoven fabric layer is treated with an adhesive roll, thereby forming a film base. Examples include a method of peeling the nonwoven fabric layer from the material.

  When the film substrate and the nonwoven fabric layer are peeled off when the disposable body warmer is used, when the body warmer is used (when the heating element generates heat), the pressure reduction effect due to the balance between air permeability and oxygen consumption causes When the film substrate is in close contact with the heating element, or when the user touches or squeezes the warmer, the film substrate and the non-woven fabric layer are peeled off at portions other than the heat seal portion.

  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]
Nylon-based spunbonded non-woven fabric (Asahi Kasei Co., Ltd., trade name “ELTAS”, weight per unit: 35 g / m ² ) on one side with a polyamide thermal adhesive at a coating amount of 5 g / m ² , sprayed onto the fiber (180 ° C). Next, a polyethylene porous film (manufactured by Nitto Lifetech Co., Ltd., trade name “BRESRON”, thickness: 70 μm) is bonded to the coated surface by thermocompression bonding (80 ° C.), and the bag of the present invention A component (breathable bag component) (surface material) was produced. In addition, the surface tension of the surface bonded with the nonwoven fabric of the said polyethylene-type porous film (film base material) is as having shown in Table 1 (it is the same hereafter).

[Production of disposable body warmers]
As a bag component (a member other than the bag component of the present invention) (backing) to be bonded to the bag component obtained above, on one side of a heat-sealable polyolefin film (thickness: 70 μm) A pressure-sensitive adhesive sheet (non-breathable bag constituting member) provided with a pressure-sensitive adhesive layer (SIS pressure-sensitive adhesive, thickness: 35 μm) was used.
The film base side of the air-permeable bag constituting member and the side opposite to the side where the pressure-sensitive adhesive layer of the non-breathable bag constituting member is provided face each other, and heat-sealing (heat seal) Conditions: 110 ° C., 4 kg / cm ² , 0.5 seconds, using a heat seal tester manufactured by Tester Sangyo Co., Ltd.) to produce a disposable body warmer. 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. The size of the warmer is 130 mm long × 95 mm wide, and a heat seal width of 5 mm (see FIG. 7).
Further, the warmer was put in an outer bag (using a commercially available warmer outer bag (a gas barrier film containing PP as a main component)), and the outer bag was sealed by heat sealing to produce a warmer product.

Example 2
In the same manner as in Example 1 except that a polyester-based spunlace nonwoven fabric (manufactured by Yuhou Co., Ltd., trade name “S0040”, basis weight: 40 g / m ² ) was used as the nonwoven fabric, Breathable bag components), disposable warmers and warmer products.

Example 3
In exactly the same manner as in Example 2, a bag constituting member (breathable bag constituting member) of the present invention was produced.
Next, a disposable body warmer was produced using the breathable bag constituting member for both the front material and the back material. The air-permeable bag constituting member was superposed so that the film bases face each other, and a disposable body warmer and a body warmer product were produced in the same manner as in Example 1.
In addition, on the surface of the backing material, a longitudinal belt-like pressure-sensitive adhesive layer (SIS) made of the same pressure-sensitive adhesive as that of Example 1 was provided at both end portions of the warmer. In order to leave the touch of the nonwoven fabric on the backing surface, an adhesive layer was provided so as to leave a non-adhesive portion of 30% or more of the area of the backing surface. Example 4 was the same.

Example 4
In exactly the same manner as in Example 2, a bag member (breathable bag member) (surface material) of the present invention was produced.
Subsequently, a polyamide-based thermal adhesive similar to that used in Example 2 (manufactured by Yuhou Co., Ltd., trade name “S0040”, weight per unit area: 40 g / m ² ) on one side with a polyamide-based thermal adhesive of 5 g / Spray coating (180 ° C.) was performed in a fibrous form with an application amount of m ² . Next, a heat-sealable polyethylene film (thickness: 50 μm) is bonded to the coated surface by thermocompression bonding (80 ° C.), and the bag body constituent member (non-breathable bag body constituent member) of the present invention ( Backing) was prepared.
The above-described breathable bag member and non-breathable bag member were overlapped so that the film substrate sides face each other, and disposable warmers and warmer products were produced in the same manner as in Example 1.

Example 5
The bag body constituent member (breathable bag body constituent member) and disposable body warmer of the present invention are the same as in Example 2 except that the thermocompression bonding temperature at the time of laminating the nonwoven fabric and the polyethylene-based porous film is changed to 95 ° C. And Cairo products were made.

  In Examples 1 to 5, the nonwoven fabric layer and the base film were not peeled off during the production of the disposable body warmer, and the nonwoven fabric layer and the base film of the bag constituting member of the present invention were temporarily attached during the production of the disposable body warmer. Met.

Comparative Example 1
Instead of the polyethylene-based porous film, a polyethylene-based porous film (same as Example 1, thickness: 70 μm) subjected to surface treatment (corona treatment, condition: 0.3 kW) is used, and the thermocompression bonding temperature at the time of bonding is used. A bag member (breathable bag member) was produced in the same manner as in Example 1 except that was changed to 90 ° C. In addition, let the said surface treatment surface be a surface to bond with a nonwoven fabric, and the surface tension of this surface is as having shown in Table 1 (it is the same below).
A disposable body warmer and a body warmer product were produced in the same manner as in Example 1 except that the air-permeable bag body constituent member was used as the air-permeable bag body constituent member.

Comparative Example 2
Instead of the polyethylene-based porous film, a polyethylene-based porous film (same as Example 1, thickness: 70 μm) subjected to surface treatment (corona treatment, condition: 0.3 kW) is used, and the thermocompression bonding temperature at the time of bonding is used. A bag member (breathable bag member) was produced in the same manner as in Example 2 except that was changed to 100 ° C.
A disposable body warmer and a body warmer product were produced in the same manner as in Example 1 except that the air-permeable bag body constituent member was used as the air-permeable bag body constituent member.

Comparative Example 3
Instead of the polyethylene-based porous film, a polyethylene-based porous film (same as Example 1, thickness: 70 μm) subjected to surface treatment (corona treatment, condition: 1.5 kW) is used, and the thermocompression bonding temperature at the time of bonding is used. A bag constituting member (breathable bag constituting member) was produced in the same manner as in Example 3 except that was changed to 120 ° C., and the above breathable bag constituting member was used for both the front material and the back material. Disposable warmers and warmer products were produced.

Comparative Example 4
Instead of the polyethylene-based porous film, a polyethylene-based porous film (same as Example 1, thickness: 70 μm) subjected to surface treatment (corona treatment, condition: 1.0 kW) is used, and the thermocompression bonding temperature at the time of bonding is used. A bag member (breathable bag member) was produced in the same manner as in Example 4 except that was changed to 120 ° C.
Further, instead of the heat-sealable polyethylene film, a heat-sealable polyethylene film (same as Example 4; thickness: 50 μm) subjected to surface treatment (corona treatment, condition: 1.0 kW) was used and pasted. A bag constituting member (non-breathable bag constituting member) was produced in the same manner as in Example 4 except that the thermocompression bonding temperature at the time of combining was changed to 120 ° C.
A disposable body warmer and a body warmer product were produced in the same manner as in Example 4 using the air-permeable bag member and the non-air-permeable bag member.

Table 1 shows the bonding temperature between the nonwoven fabric and the film substrate in the above Examples and Comparative Examples, and the surface tension of the surface of the film substrate on the side bonded to the nonwoven fabric.
Moreover, the non-woven fabric layer and the film base material of the non-woven fabric layer and the film base material when used as a disposable body warmer. Table 1 shows the evaluation results of the peeled state and the texture and feel of the disposable body warmers.
In addition, said evaluation was performed as follows.

[Evaluation]
(1) Peeling force between the nonwoven fabric layer and the film substrate (parts other than the heat seal part)
A strip-shaped sample of 100 mm (longitudinal direction) × 25 mm (width direction) was cut out from the bag constituent members (members having a nonwoven fabric layer and a film substrate) obtained in Examples and Comparative Examples and used for measurement. What peeled the film base material and the nonwoven fabric about 20 mm in the longitudinal direction was used.
Each of the base film and the nonwoven fabric layer was sandwiched between both ends of a chuck of a measuring machine, and a T-type peel test was performed under the following conditions to measure the peel force (peel force between the base film and the nonwoven fabric layer).
Equipment: “Shimadzu Autograph” manufactured by Shimadzu Corporation
Sample width: 25mm
Tensile speed: 300 mm / min Temperature and humidity environment: 23 ° C., 50% RH
Number of repetitions: n = 3
Calculation method: Average value of peel load (calculated from data of peel distance 20 to 60 mm)

(2) Peeling force between non-woven fabric layer and film substrate (heat seal part)
As shown in FIG. 7, a strip-shaped sample of 50 mm (longitudinal direction) × 25 mm (width direction) was cut out from the disposable body warmers obtained in Examples and Comparative Examples and used for measurement. .
The sample non-woven fabric and the film base material were peeled off by about 20 mm in the longitudinal direction, and both ends were sandwiched between chucks of a measuring machine, and a T-type peel test was performed in the same manner as (1) above. The peeling force (peeling force between the base film and the nonwoven fabric layer) was measured. In addition, it was set as the peeling force (peeling force between a base film and a nonwoven fabric layer) of a heat seal part with the maximum value of the peeling load in a heat seal part (as a peeling distance for 5 mm).

(3) Peeled state of base film and nonwoven fabric The disposable body warmers prepared in Examples and Comparative Examples are taken out from the outer bag, and are put on clothes (waist) after hand-rubbing 2-3 times assuming actual use. After attaching and using for 1 hour, the peeling state of a nonwoven fabric layer and a film base material was observed visually.
In parts other than the heat seal part, the film base material and the non-woven fabric layer are not destroyed, and when the non-woven fabric layer (including the adhesive layer) and the film base material are peeled off, the peeled state is good ( ○) On the other hand, when the film base material or the non-woven fabric layer was broken, or when the non-woven fabric layer and the film base material were not peeled, it was judged that the peeled state was poor (x).

(4) Texture, feel The disposable body warmers prepared in Examples and Comparative Examples were evaluated according to the following criteria. In addition, about the Example, it evaluated about the bag body structural member of this invention, and about the comparative example, the bag body structural member which consists of a laminated body of the nonwoven fabric and film base material used instead of the bag body structural member of this invention was evaluated.
Texture and feel good (O): The entire surface has the same soft touch as that of the non-woven fabric. When the finger is slid, the non-woven fabric is deformed and feels soft.
Unsatisfactory texture / feel (x): The nonwoven fabric is fixed to the film substrate, and even if the finger is slid, the nonwoven fabric does not deform and does not feel soft.

As is clear from Table 1, the disposable body warmers (Examples) using the bag body member in which the nonwoven fabric layer and the film base material are temporarily attached (peeling force is 0.2 N / 25 mm or less) The layer and the film substrate were in a peeled state, and Cairo had an excellent texture and feel. On the other hand, the disposable body warmer (comparative example) using the bag constituent member in which the peel strength between the nonwoven fabric layer and the film substrate exceeds 0.2 N / 25 mm does not sufficiently separate the nonwoven fabric layer and the film substrate even when using a warmer. Cairo's texture and feel were inferior.
Furthermore, the nonwoven fabric layer and the film base material showed sufficiently high adhesive strength in the heat seal part.

It is a schematic sectional drawing which shows an example of a sticking type disposable body warmer. It is a schematic sectional drawing which shows an 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 (state before use and a nonwoven fabric layer and a film base material are temporarily attached) which used the bag body structural member for disposable body warmers of this invention as a surface material. It is a schematic sectional drawing which shows an example of the disposable body warmer (state which the nonwoven fabric layer and the film base material isolate | separated at the time of use) which used the bag body structural member for disposable body warmers of this invention as a surface material. It is a schematic sectional drawing which shows an example of the disposable body warmer (the state before use and a nonwoven fabric layer and a film base material are temporary attachment) which used the bag body structural member for disposable body warmers of this invention as a surface material and a backing material. It is a schematic sectional drawing which shows an example of the disposable body warmer (state which the nonwoven fabric layer and the film base material isolate | separated at the time of use) which used the bag body structural member for disposable body warmers of this invention as a surface material and a backing material. Schematic explanatory drawing seen from the front material side (opposite to the adherend) of the disposable body warmer produced in the examples and explanatory drawing showing the cut-out position of the sample for measuring the peeling force of the nonwoven fabric layer and the film substrate of the heat seal part is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag body structural member 2 Bag body structural member 3 Heat generating body 4 Adhesive layer (For sticking with a to-be-adhered body)
DESCRIPTION OF SYMBOLS 5 Nonwoven fabric layer 6 Adhesive layer 7 Film base material 8 Other bag structural member 9 Disposable body warmer 10 Heat seal part 11 Cutout position of sample for measuring peel force of nonwoven fabric layer and film base material of heat seal part

Claims (6)

The nonwoven fabric layer on the film substrate are laminated with a laminate member including at least, the provided film substrate and the nonwoven fabric layer is laminated via a hot-melt adhesive, and the said film substrate A disposable warmer bag component comprising the nonwoven fabric layer in a temporary attachment state, as at least a part of the component of the warmer bag,
The disposable body warmer characterized in that the film base is located on the inner side of the warmer bag body with respect to the nonwoven fabric layer. The disposable warmer bag-constituting member, onto the film substrate surface tension is 30~45dyn / cm, the nonwoven fabric layer, the conditions of the hot-melt adhesive by laminating temperature 60 to 100 [° C. The disposable body warmer according to claim 1, which is a bag body constituting member for disposable body warmers manufactured by a method of bonding. The disposable body warmer according to claim 1 or 2, wherein the film substrate is a film substrate having a heat seal layer made of a porous film. The disposable body warmer according to claim 3, wherein the porous film is a polyolefin-based porous film. The bag body for warmers is formed by heat sealing,
In use, it peeled off the non-heat-sealed portion film substrate and the nonwoven fabric layer, the film base material and the nonwoven fabric layer of the heat-sealed portion in any one of claims 1 to 4, a state which did not peel off The disposable warmer as described . The disposable body warmer according to claim 5, wherein an adhesive force between the film base material and the nonwoven fabric layer in the heat seal part is 3.0 N / 25 mm or more.

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