Provided is a method for efficiently producing products having good heat generation performance without reducing the production speed by delaying or preventing the start of heat generation of heat-generating compositions/heating elements during production or before sealing to an outer bag. Provided is a production method capable of avoiding unevenness of a heat-generating compositions in a bag/container or formation of a portion not filled with heat-generating compositions. A method for producing a heating element including a heat-generating composition that generates heat upon reaction with oxygen in air includes encapsulating a heat-generating composition precursor including a mixture containing a water-insoluble component of the heat-generating composition in an air-permeable bag/container formed of a water-permeable packaging material at least in part. The method also includes injecting a liquid component of the heat-generating composition into the heat-generating composition precursor through the water-permeable packaging material from a nozzle tip in contact with the water-permeable packaging material.

The present invention relates to a heating element composition, and a method of manufacturing an eye mask pack, which shows that a heating temperature is regular, and heat is uniformly generated, a heating pack is able to be worn in a state of coming into close contact even with a curved surface, a preservation period is long, and the heating temperature and time for which heat is generated can be adjusted minutely. Also, the present invention relates to a device of manufacturing an eye mask pack which is capable of manufacturing self-heating packs rapidly even without the use of nitrogen.

The present invention relates to a warming tool (1) in which a heat generating element (3) is held between a topsheet (5) that faces a heating target and a backsheet (6) that is located on a side away from the heating target, and a method for manufacturing the same. The heat generating element (3) has a first sheet (3f) arranged opposing the topsheet (5), a second sheet (3g) arranged opposing the backsheet (6), and a heat generating portion (3a) sandwiched between the first sheet (3f) and the second sheet (3g). In the warming tool (1), a perfume (8) and an adhesive (7) are arranged between the second sheet (3g) and the backsheet (6), and a region in which the adhesive (7) is arranged and a region in which the perfume (8) is not arranged overlap each other in a plan view. In the manufacturing method, the perfume is added to a surface of the second sheet (3g) that is planned to oppose the backsheet (6), or to a surface of the backsheet (6) that is planned to oppose the heat generating element (3), and the heat generating element (3) is held such that the backsheet (6) and the second sheet (3g) oppose each other.

A steam generator according to the present invention comprises a heat generating layer comprising an oxidizable metal, a carbon component, and water, a first water absorbent layer laminated on the heat generating layer and comprising a first water absorbent, a water absorbing sheet laminated on the first water absorbent layer, and a second water absorbent layer laminated on the water absorbing sheet and comprising a second water absorbent.

An object of the present invention is to provide a water absorbent resin powder for a heat-generating element composition, which suppresses the generation of the aggregates derived from the water absorbent resin and the adhesion of the water absorbent resin in the production of a heat-generating element composition.

A present inventive water absorbent resin powder for a heat-generating element composition includes polyacrylic acid (salt)-based water absorbent resin powder which have a bulk specific gravity (specified by JIS K3362) of 0.630 g/cm.sup.3 or less, fluid retention capacity without load (CRC) for a 0.9% by weight aqueous solution of sodium chloride (specified by ERT441.01-2) of 32.0 g/g or less, a weight-average particle diameter (specified by sieve classification) of 250 μm or more, and an amount of a residual glycidyl-based crosslinking agent of 10 ppm or less.

The purpose of the present invention is to provide a heat generator that comprises an adhesive layer containing a volatile component and in which the volatile component is maintained in a stable state during storage, the volatile component is prevented from adhering to a heat-generating section, and it is possible to achieve an excellent warming effect during use. This heat generator comprises: a heat-generating section, an accommodation body that accommodates the heat-generating section and comprises an attachment surface to which an attachment body is attached, an adhesive layer provided to the attachment surface side of the accommodation body, and a release sheet provided to the attachment surface side of the adhesive layer. As a result of including a volatile component in the adhesive layer and providing a metal foil membrane to the release sheet, it is possible to maintain the volatile component in a stable state within the adhesive layer during storage. It is thereby possible to prevent the adhesion of the volatile component to the heat-generating section during storage and to achieve an excellent warming effect during use.

The purpose of the present invention is to provide a heat generator that contains a volatile component and in which the volatile component is stably maintained during storage, the volatile component is prevented from adhering to a heat-generating section, and it is possible to achieve an excellent warming effect during use. This heat generator comprises a heat-generating section (1), an accommodation body (2) for accommodating the heat-generating section (1), an adhesive layer (3) provided to an attachment surface side of the accommodation body (2), and a release sheet (4) provided to the attachment surface side of the adhesive layer (3). As a result of including a volatile component in the adhesive layer (3) and respectively providing gas barrier layers (211), (41) to a first packaging material (21) constituting the attachment surface side of the accommodation body (2) and to the release sheet (4), it is possible to stably maintain the volatile component within the adhesive layer (3) during storage. It is thereby possible to prevent the volatile component from adhering to the heat-generating section (1) during storage and to achieve an excellent warming effect during use.

The invention is a portable heater assembly for retaining a disposable heating element within and further providing a means for controlling heat output therefrom.

A heat generator comprises a heat-generating composition that generates heat upon contact with air, a storage bag that can store the heat-generating composition in a storage part inside thereof, and an adhesive layer provided on one surface of the storage bag. The storage bag has, in plan view, an outer shape having a constricted part recessed inward between two convexly protruding first apex and second apex; and the storage bag is provided with a dividing part that divides the storage part and allows the storage bag to be folded between the first apex and the second apex.

An outer bag for disposable body warmer packaging and a disposable body warmer are provided that are excellent in a gas barrier property that inhibits permeation of oxygen gas, water vapor and the like, which can allow swelling due to hydrogen gas generated during a storage period to be prevented. Provided is an outer bag for disposable body warmer packaging having an accommodating portion accommodating a disposable body warmer accommodated in an air-permeable inner bag and generating heat through contact with air, the outer bag comprising a low air-permeability portion having an oxygen permeability of 1.5 to 20 cc/m.sup.2.Math.day.Math.atm measured at 20 C. and 90% RH and a water vapor permeability of 0.05 to 10 g/m.sup.2.Math.day measured at 40 C. and 90% RH; and an air-impermeable portion having an oxygen permeability of 1.3 cc/m.sup.2.Math.day.Math.atm or lower measured at 20 C. and 90% RH and a water vapor permeability of 2.0 g/m.sup.2.Math.day or lower measured at 40 C. and 90% RH, wherein the outer bag for disposable body warmer packaging has at least one heat-sealed portion formed by heat-sealing one or more laminated sheets, and the low air-permeability portion is provided in at least a part of a region adjacent to the heat-sealed portion.