A warming device including a heat generating element and an enclosing material that houses the heat generating element is described. A portion of the enclosing material that comes into contact with a target to be warmed when the warming device is in use is made of an air permeable fibrous sheet that contains crimped fibers and non-crimped fibers. The ratio of the non-crimped fibers relative to the total of the crimped fibers and the non-crimped fibers in the fibrous sheet is 50 mass % or more. The fibrous sheet included in the heat generating element is configured to increase the thickness thereof by 0.2 mm or more and 0.7 mm or less during a period from the start to the end of heat generation.

A flexible adhesive kinesiology/physio tape adapted to produce heat from the exothermic oxidation when exposed to air. The inventive tape includes a layer of porous material with iron and salt disposed therein. In the best mode, the layer is flexible and self-adhesive. A layer of plastic is included to inhibit oxidation prior to application and use. In a preferred embodiment, the inventive flexible adhesive tape includes a first layer of flexible adhesive high quality porous fabric; a second layer of flexible adhesive high quality porous fabric; and the layer of flexible exothermic material, sandwiched between the first and second layers. The third layer can be fabricated with cellulose, iron, water, activated carbon, vermiculite and salt or fabricated with a mixture of chemical salt in dry crystal form with water. Or any other chemical mixture that creates an exothermic reaction.

An expandable, exothermic gel-forming composition that is predominately useful in the consumer products and medical industries. More particularly, it relates to the use of expandable particulate exothermic gel-forming compositions with efficient and long-lasting heat production for heating surfaces and objects without the need for electricity or combustible fuel.

An iron powder for an exothermic composition according to the present invention has a bulk density of 0.3 to 1.5 g/cm.sup.3. Furthermore, an exothermic composition according to the present invention contains the iron powder, a carbon material, a halide salt, and water. Furthermore, an exothermic body production method according to the present invention includes: forming a coated member by coating a base material sheet with a flowable exothermic composition containing the iron powder, a carbon material, and water; and adjusting an amount of moisture in the coated member by removing water from the coated member. Furthermore, the present invention is directed to a production method for the iron powder (an iron powder for an exothermic composition) including: a reducing step of reducing iron oxide to obtain reduced iron; and a step of milling the reduced iron. In the reducing step, the iron oxide is reduced by introducing iron oxide and a solid reductant with a volatile matter content of 10% by mass or more into a heating furnace whose internal portion contains no sulfur gas or is set to an air or inert gas atmosphere, and setting the internal portion to a reducing gas atmosphere through heating under a condition that an ambient temperature of the internal portion is from 900 to 1000° C.

This invention provides a heating tool that is capable of significantly suppressing a reduction of an active ingredient contained in an adhesive layer. More specifically, the invention provides a heating tool comprising an exothermic composition containing an oxidation accelerator, an oxidizable metal powder, and water; an active ingredient-containing adhesive layer; and a vapor deposition layer, the exothermic composition being housed in an air-permeable container bag, the vapor deposition layer being disposed between the container bag and the adhesive layer.

An object of the present invention is to provide a heat-generating device with which a warm sensation is persistently perceived, and which can effectively exert a heating effect. In a heat-generating device that is used by being attached to skin, (1) a packaging material constituting a skin attachment surface of a housing is formed of a laminated sheet in which at least a moisture absorption layer that absorbs moisture and a moisture barrier layer that blocks penetration of moisture are laminated in this order from the adhesive layer, (2) an adhesive layer is partially provided on a surface of the moisture absorption layer, and (3) a warming agent that allows an enhanced warm sensation to be perceived in the presence of moisture is contained in at least one of the adhesive layer and the moisture absorption layer. This heat-generating device thereby has improved persistence of a perceived warm sensation, and can exert a markedly high heating effect.

A means for controlling the temperature of a warming material includes an air-permeable film or the like. The warming material includes the temperature control means and a heating composition. The temperature control means for controlling the heating temperature of the warming material includes one or more aliphatic compounds that have a melting point of 35-65° C. and a solubility in water (g/100 mL) at 20° C. of 5 or less.

Disclosed is a self-heating thermal-insulation multilayer film comprising a structure of at least three layers, which from outside to inside are respectively: an outer layer (1) formed of an air permeable material; a heat-generating layer (2) loaded with heat-generating composition (21) that generates heat on contact with air, at least an upper sealing surface of the heat-generating layer that is in contact with the outer layer being formed of an air permeable material; and an thermal-insulation layer (3) formed of a material having waterproof and thermal-insulation properties. The present self-heating thermal-insulation film is structurally simple, is not constrained by environmental resources, does not require energy supply from an external energy source, is safe and stable, uniformly generates heat, and can effectively prolong heating time and reduce peak heating temperature. The present self-heating thermal-insulation film can be manufactured into a three-dimensional face mask, a face mask, or an eye mask.

A heating device having at least one package surrounding a hygroscopic salt and a heater mix having at least a metal reactant. The heating device may include a source of moisture positioned in the package, the source of moisture initially generating an atmosphere having nearly 100% relative humidity inside the package. The hygroscopic salt is spatially separated from the source of moisture within the at least one package and positioned so as to absorb moisture out of the atmosphere to form an electrolyte, and the hygroscopic salt is further positioned so that the electrolyte generated by the hygroscopic salt is in contact with the heater mix. Rather than have an internal source of moisture, the at least one package may be water vapor permeable to allow ambient moisture from the atmosphere to enter the interior of the package to combine with the hygroscopic salt to generate an electrolyte.

Provided is a heating body that enables high-speed production using a conventional rotary heat-sealing roll, has a wearing portion with sufficient strength to use by inserting a hand or the like, thereby being used safely and conveniently, and can be worn on the body or the like without being adhered thereto, and a method for producing the same. An example of one aspect of the present invention is a heating body in which a heat-generating composition that generates heat in the presence of air is accommodated in a bag body formed by heat sealing a one-surface side laminated base material comprising a first base material and a second base material, and a covering material, at a peripheral edge portion thereof, characterized in that: the first base material has one surface being a nonwoven fabric layer and the other surface being a heat sealable resin layer; the second base material is a sheet in which an olefin-based nonwoven fabric layer and a resin film are laminated using an olefin-based resin; the first base material and the second base material are capable of forming a space into which a body part can be inserted or held, in a part surrounded by the peripheral edge portion; and in a heat sealed part of the bag body peripheral edge portion, the heat sealable resin layer of the first base material and the nonwoven fabric layer of the second base material are bonded together, and the resin film of the second base material and the covering material are bonded together; as well as a method for producing the same.