TWI736035B - Heating appliance - Google Patents

Abstract

The heating appliance (1) is provided with: a main body (2), which has a shape that covers the eyes of the user when in use; a heating element (3), which is provided on the main body (2); and a pair of ear parts (4) ), which is installed on the main body (3) and can maintain the covering state of the main body (3) on the eyes of the user. The main body part (3) is provided with: a front sheet (5), which is located on the side close to the user's skin, and a back sheet (6), which is located on the side away from the user's skin. The heating element (3) is held between the front sheet (5) and the back sheet (6). The amount of voids in the back sheet (6) is 1000 cm ³ /m ² or more and 6000 cm ³ /m ² or less.

Description

Heating appliance

The invention relates to a heating appliance.

The applicant has previously proposed a heating appliance with a printing section (refer to Patent Document 1). The heating appliance is arranged in a packaging material with a body side sheet facing the user's body side during use and an outer side sheet facing the outside during use, and is equipped with a heating part containing an oxidizable metal, the outer sheet and /Or the body side sheet includes a non-woven fabric having a printed portion formed by contact printing in at least a part thereof. In addition, by using a basis weight of 25-60 g/m ² , a non-woven density of 0.01-0.04 g/cm ³ , and a compression load-compression set curve measured in accordance with KES (Kawabata Evaluation System) The linear LC (compression linearity, compression linearity) value is 0.4-0.8 as the non-woven fabric, and the heating appliance exerts the visually beneficial effect of the pattern or characters of the printing part, which looks very three-dimensional. Prior Art Document Patent Document

Patent Document 1: Japanese Patent Laid-Open No. 2011-250873

The present invention provides a heating appliance, which is provided with: a main body having a shape that covers the eyes of a user when in use; a heating element provided on the main body; and a pair of ear parts installed on the main body And it can maintain the covering state of the main body to the eyes of the user. The above-mentioned main body part is provided with: a front sheet, which is located on the side close to the user's skin, and a back sheet, which is located on the side away from the user's skin. The heating element is held between the front sheet and the back sheet. The amount of voids per unit area of the back sheet is 1000 cm ³ /m ² or more and 6000 cm ³ /m ² or less.

The heating appliance described in Patent Document 1 imparts the warm heat generated from the sheet-like heating element to the user through the body side sheet, but the warm heat is dissipated to the outside through the outer sheet. There is room for improvement in efficiency. On the other hand, when the outer side sheet with a large number of voids between the fibers is used for the purpose of improving the efficiency of applying warm heat, the printing of characters or patterns on the outer surface of the outer sheet cannot be performed smoothly, so There is room for improvement regarding the improvement of the printability of heating appliances.

The present invention relates to a warming appliance with excellent heat preservation and printing properties. Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. Fig. 1 shows an embodiment of the heating appliance of the present invention. The heating appliance 1 shown in the figure is a so-called eye mask type, which is abutted so as to cover the eyes of a person, and is used to heat water vapor heated to a specific temperature to the eyes and their surroundings.

As shown in Figure 1, the heating appliance 1 has: a main body 2 which has a shape that covers the eyes of the user when in use and is longer in the lateral direction X; a heating element 3 which is arranged on the main body 2; and a pair of hangers Ears 4, 4. The ear hanging parts 4 are arranged at the two outer end regions of the main body part 2 in the transverse direction X, and can be turned toward the outer side of the transverse direction X. Thereby, the ear hanging parts 4, 4 are respectively hung on the user's ears, and the covering state of the main body part 2 on the eyes of the user can be maintained. From the viewpoint of improving the wearability, the sheet constituting the ear strap 4 is preferably a sheet having stretchability.

FIG. 2 shows an exploded perspective view of the heating appliance 1. In addition, FIG. 3 shows a cross-sectional view of the heating appliance 1 along the transverse direction X (longitudinal direction). The main body part 2 of the heating appliance 1 shown in these figures is provided with: a front sheet 5 located on the side close to the user's skin; and a back sheet 6 located on the side away from the user's skin. That is, the upper side in the figure is the side close to the user's skin, and the lower side in the figure is the side away from the user's skin. The surface of the back sheet 6 on the side away from the skin of the user, that is, the surface forming the outer surface of the heating appliance 1 is a printing surface 6S on which characters, patterns, etc. can be printed. In the following description, the direction corresponding to the longitudinal direction of the heating appliance 1 is also referred to as the transverse direction X, and the direction orthogonal to the transverse direction X is also referred to as the longitudinal direction Y.

The front sheet 5 and the back sheet 6 shown in Figs. 2 and 3 are joined to each other in the state of being overlapped with an adhesive 7 such as a hot melt adhesive, whereby the two sheets 5, 6 can be Two heating elements 3 and 3 are held apart from each other in the longitudinal direction. Both the front sheet 5 and the back sheet 6 have air permeability.

The heating element 3 held between the front sheet 5 and the back sheet 6 includes an oxidizable metal, a reaction accelerator, an electrolyte, and water. As the heating element 3, a heating sheet or a heating composition can be used. The heating sheet is composed of a fibrous sheet containing an oxidizable metal, a reaction accelerator, a fibrous material, an electrolyte, and water, and the heating composition includes Oxidizable metals, reaction promoters, water retention agents, electrolytes and water. The heat-generating sheet and the heat-generating composition can also be used alone, and it is possible to use a bag that contains at least one of the heat-generating sheet and the heat-generating composition in a bag formed by pasting a plurality of sheets. As various materials constituting the heat generating sheet or the heat generating composition, for example, the materials described in Japanese Patent Laid-Open No. 2003-102761 and Japanese Patent Laid-Open No. 2006-340928 can also be used.

The cross-sectional view shown in FIG. 3 shows the fixed state of the heating element 3 formed by housing the heating sheet in the bag. The heating element 3 shown in the figure is fixed to the inner surface of the back sheet 6 of the heating appliance 1 by forming adhesive fixing portions 7 a and 7 a with an adhesive 7, and the other surfaces are not fixed to the back sheet 6. Each subsequent fixing portion 7a, 7a is provided in the central area of the horizontal X of the heating appliance 1 and extends along the longitudinal Y of the heating appliance 1. By having such a configuration, the heating element 3 is smoothly arranged on the eyes of the user and the vicinity thereof when the heating appliance 1 is used.

Returning to FIG. 2, the ear strap 4 shown in this figure includes a sheet material, and an insertion portion 4A extending in the transverse direction X is formed on the sheet material. The insertion part 4A is a hole for the ear to pass through when the ear hanging part 4 is hung on the ear. Instead of this, the insertion portion 4A may be formed by a through slit or the like through which the ear can pass. As shown in Figures 2 and 4, the ear hangers 4 are attached to the outer surface of the front sheet 5 in the main body 2 at the two outer end regions in the transverse direction X, thereby forming the main body 2 and the ear hangers 4 Joining area 9 to be joined. The joint area 9 also functions as a bending portion when the ear strap 4 is turned around the joint end portion 9s as an axis.

FIG. 4 is a cross-sectional view showing the form of the bonding area 9. The joint area 9 between the body part 2 and the ear strap 4 shown in FIGS. 2 and 4 is continuous from the joint end 9s as the inner end of the transverse X in the joint area 9 to the outer end of the body 2 in the transverse X Ground joints, and in the shape of a semi-ellipse. As shown in FIG. 4, the joining area 9 is formed by joining the front sheet 5 and the ear strap 4 together. The joint area 9 also functions as a bending portion when the ear strap 4 is turned around the joint end portion 9s as an axis. The bonding area 9 shown in FIGS. 2 and 4 is formed by continuous bonding, but instead of this, it may be formed by intermittent bonding.

One of the characteristics of the heating appliance of the present invention is to use the back sheet 6 having a specific amount of voids. The so-called void volume in this specification refers to the volume of air per unit area of the back sheet. In detail, the amount of voids of the back sheet 6 is preferably 1000 cm ³ /m ² or more, more preferably 1500 cm ³ /m ² or more, still more preferably 2000 cm ³ /m ² or more, and still more preferably 2500 cm ³ /m ² or more, and preferably 6000 cm ³ /m ² or less, more preferably 5000 cm ³ /m ² or less, still more preferably 4000 cm ³ /m ² or less, still more preferably 3000 cm ³ / m ² or less. This amount of voids can be achieved, for example, by using a hot air method to make the fibers constituting the sheet not compact and bulky, or using crimped fibers, hollow fibers, or shaped fibers described later.

According to the heating appliance of the present embodiment in which the back sheet having a specific amount of voids is arranged, it is excellent in both heat retention and printability. In detail, if the back sheet has a dense structure, the adhesion of the ink can be improved, and the characters and patterns can be printed clearly, and the printability is improved. However, since there are few voids in the sheet, it is difficult to display and use The thermal insulation effect of air, as a result, the thermal insulation of the heating appliance decreases. On the other hand, if the back sheet is made fluffy and the voids in the sheet are increased, the heat insulation effect is easily displayed and the heat retention is improved, but the adhesion of the ink to the sheet is not good, and the printability is reduced. Regarding these aspects, by using a back sheet with a specific amount of voids in a heating appliance, it is possible to take into account the heat insulation effect that contributes to heat preservation and the density of the sheet that contributes to printability, so it is difficult to make self-heating elements The generated warm heat escapes to the outside, which can improve the thermal insulation of the heating appliance, and can improve the printability. Especially in the technical field of heating appliances, it has not been known that a parameter called porosity is the dominant factor for the balance between the heat preservation property of the heating appliance and the printability of the sheet material.

The amount of voids can be measured by the following method, for example. First, the sheet to be measured is cut out so as to become a specific area A (m ² ), and the thickness B (m) of the sheet is measured under a load of 3.7 gf/cm ² (36.28 mN/cm ^{2 ).} In addition, when measuring the mass C (g) of the cut-out sheet to be measured, and setting the density of the material constituting the sheet as D (g/m ³ ), the amount of voids (cm ³ /m ² ) can use the following Equation (1) is obtained. Furthermore, "mass C/area A" is ^{synonymous with the basis weight E (g/m 2} ) of the cut-out measurement target sheet, so the amount of voids can also be measured as the following formula (2). In the case of using plural kinds of materials such as resin constituting the sheet, the density D is set to a value calculated from the true density of the constituting resin and its content by mass ratio. The amount of void (cm ³ /m ² )=(A×B－C/D)×10 ⁶ /A・・・(1) The amount of void (cm ³ /m ² )=(B－E/D)×10 ⁶ ···(2)

The usable sheet of the back sheet 6 is not particularly limited as long as it is in the range of the above-mentioned void amount. Fibrous sheets such as non-woven fabrics, woven fabrics, paper, resin foam sheets, metal sheets, or combinations thereof are used. . In addition, these sheets can also be used by mixing multiple types of fibers with different fiber raw materials, fiber thickness, and degree of crimping, etc., to use or combine multiple types of sheets to express desired properties. The back sheet 6 may have a single structure including one sheet composed of one fiber layer, or a single structure including two or more sheets or fiber layers that cannot be peeled to form a single sheet, or Two or more kinds of sheets or fiber layers can be peeled and overlapped to form a composite structure. From the viewpoint of easily forming the back sheet 6 exhibiting desired properties and fully exhibiting the strength of the sheet, it is preferably a sheet with a single structure that has two or more fiber layers and cannot be peeled off between the layers.

When a non-woven fabric is used as the back sheet 6, for example, a non-woven fabric manufactured by performing at least one of hot air, thermal bonding, and needle punching can be used, preferably a non-woven fabric manufactured by a combination of hot air treatment and thermal bonding. In the case of using such a non-woven fabric as the back sheet 6, for example, a heated air stream is blown to the raw fiber supplied from a carding machine to form a fiber structure, and then a heat roller is used to thermally bond one surface of the fiber structure Processing, thereby realizing the above-mentioned range of void amount. By using a nonwoven fabric subjected to thermal bonding treatment as the back sheet 6, the density of fibers existing on the surface of the nonwoven fabric subjected to thermal bonding treatment can be improved, and thus printability can be further improved.

The heating element 3, the ear hanging part 4, and the front sheet 5 can be used as long as the air permeability, moisture permeability, texture, stretchability, strength, or leakage of the constituent materials of the heating sheet and the heating composition are considered. The properties such as prevention may be appropriately determined. For example, fiber sheets such as non-woven fabrics, woven fabrics, paper, resin foamed sheets, metal sheets, or a combination of these can be used. As a sheet with high air permeability, melt-blown non-woven fabric is suitable. As a sheet used for the purpose of improving the texture, it is suitable to use a hot-air non-woven fabric or a heat-bonded non-woven fabric. As a sheet used for the purpose of expressing stretchability, for example, air-through nonwoven fabric, spunbonded nonwoven fabric, thermally bonded nonwoven fabric, etc. containing synthetic fibers such as polyethylene terephthalate, polyethylene, and polypropylene are used. As the sheet used for the purpose of imparting strength, spunbonded nonwoven fabric or spunlace nonwoven fabric is suitably used. It can be used on the basis of the above non-woven fabric or instead of it, the non-woven fabric is treated with silicone or surfactant, etc., or the foamed sheet made of thermoplastic resin such as polyethylene or polyurethane as raw material can be used. Wait. In addition, these sheets can also be used by mixing multiple types of different fibers such as fiber raw materials, fiber thickness, and fiber crimping degree, or combining multiple types of sheets to express desired properties. The heating element 3, the ear hangers 4, and the front sheet 5 may be composed of a single fiber layer, or a single structure including two or more fiber layers that cannot be peeled and stacked into one sheet, or a combination of two or more Sheets can be peeled and overlapped into a composite structure.

When non-woven fabrics are used as the front sheet 5 and the back sheet 6, the basis weight of the front sheet 5 is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 200 g /m ² or less, more preferably 130 g/m ² or less. In addition, the basis weight of the back sheet 6 is preferably 15 g/m ² or more, more preferably 30 g/m ² or more, preferably 105 g/m ² or less, and more preferably 75 g/m ² or less. When the front sheet 5 and the back sheet 6 have a laminated structure, the basis weight of the entire sheet may be within the above-mentioned range.

The back sheet 6 preferably has the above-mentioned amount of voids, and as shown in FIG. That is, the back sheet 6 is preferably configured as a single structure or a composite structure, the single structure including a sheet having a first fiber layer 6a and a second fiber layer 6b and the layers cannot be peeled off, the composite structure It is a laminated body provided with the sheet material which comprises the sheet material which comprises the 1st fiber layer 6a and the sheet material which comprises the 2nd fiber layer 6b, and the sheet material which is releasably comprised. In this case, regarding the amount of voids of the back sheet 6, as long as the amount of voids of the entire back sheet 6 satisfies the above-mentioned range, the effect of the present invention can be exerted.

When the back sheet 6 has a single structure, the fiber layers constituting the back sheet 6 may only be the first fiber layer 6a and the second fiber layer 6b, or may be between the first fiber layer 6a and the second fiber layer 6b. There are other fiber layers on the basis. Regardless of the form, the fiber layers in a single structure are constructed so as not to be peelable from each other.

When the back sheet 6 has a composite structure, the back sheet 6 may be composed of only one sheet constituting the first fiber layer 6a and one sheet constituting the second fiber layer 6b, or the first fiber layer The one sheet of 6a and the one sheet of sheet constituting the second fiber layer 6b are constituted by further including other sheets. Regardless of the form, the sheets in the composite structure can be peeled off.

The fiber types of the first fiber layer 6a and the second fiber layer 6b are different from each other. The term "different fiber type" not only refers to the case where the type of resin constituting the fiber is different, but also includes the case where the thickness and/or length of the fiber are different although the type of resin is the same. In this case, the basis weight of the sheet constituting the first fiber layer 6a is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 70 g/m ² or less, more preferably It is 50 g/m ² or less. Similarly, the basis weight of the sheet constituting the second fiber layer 6b is preferably 5 g/m ² or more, more preferably 10 g/m ² or more, and preferably 35 g/m ² or less, and more preferably 25 g/m 2 g/m ² or less.

The first fiber layer 6a shown in FIG. 5 is arranged in such a way that the surface close to the user's skin faces the heating element 3. In addition, the second fiber layer 6b is arranged on the surface side of the first fiber layer 6a away from the skin of the user, and constitutes the outer surface of the heating device 1. The outer surface of the second fiber layer 6b is a printing surface 6S. The bonding of the first fiber layer 6a and the second fiber layer 6b can be performed by, for example, bonding using an adhesive, heat fusion, pressure bonding, or a combination of these. By having such a configuration, the amount of voids in the back sheet 6 can be adjusted more simply, and as a result, a heating appliance excellent in heat retention and printability can be manufactured with higher manufacturing efficiency.

When using a non-woven fabric having the first fiber layer 6a and the second fiber layer 6b as the back sheet 6, the constituent fibers of the second fiber layer 6b are preferably such that the fiber thickness is smaller than the thickness of the constituent fibers of the first fiber layer 6a . Generally speaking, non-woven fabrics using fine-diameter fibers have high fiber density and are easy to become dense structures, so printability is improved, but heat retention tends to decrease. In contrast, non-woven fabrics using large-diameter fibers have low fiber density and tend to have a bulky structure, so there are many voids in the sheet, and the heat retention is improved, but the printability tends to decrease. In order to take into account these characteristics, as the structure of the back sheet 6, the second fiber layer 6b that constitutes the outer surface of the heating device 1 is preferably composed of thin fibers, and the first fiber facing the heating element 3 The layer 6a is preferably composed of fibers having the same diameter as the fine-diameter fibers or having a larger diameter than the fibers, so that the second fiber layer 6b of a dense structure can be used to further improve the printability, and the first fiber layer 6a of the fluffy structure can be used to further improve Thermal insulation effect. As a result, the heating appliance becomes more excellent in heat retention and printability.

In particular, as the back sheet 6, a sheet containing at least the first fiber layer 6a and the second fiber layer 6b is used, and the thickness of the fibers constituting the second fiber layer 6b is smaller than the thickness of the fibers constituting the first fiber layer 6a. Therefore, the first fiber layer 6a becomes a fluffy structure with a higher porosity formed by entanglement of thicker fibers with each other, and becomes a layer mainly used for improving heat retention. In addition, the second fiber layer 6b has a high-density structure formed by entanglement of finer fibers, and is a layer that mainly contributes to the improvement of printability such as the improvement of ink adhesion. That is, by setting the first fiber layer 6a as a layer mainly for improving heat retention and setting the second fiber layer 6b as a layer mainly for improving printability, it is easy to express different properties in each fiber layer, and it is easy to It is possible to obtain a back sheet 6 with a higher level of heat retention and printability, so a heating appliance with better heat retention and printability can be obtained with higher productivity.

The thickness of the fibers constituting the second fiber layer 6b is based on the condition that the thickness of the fibers constituting the first fiber layer 6a is the same as or smaller than that of the fiber. The fineness is preferably 0.8 dtex or more, more preferably 1.0 dtex or more, And it is preferably 2.0 dtex or less, more preferably 3.0 dtex or less. Similarly, the thickness of the fibers constituting the first fiber layer 6a is preferably 1.5 dtex or more in fineness, more preferably 2.0 dtex or more, and preferably 10.0 dtex or less, and more preferably 5.0 dtex or less. When the first fiber layer 6a and the second fiber layer 6b contain two or more fibers with different fiber thicknesses, the thickness of the constituent fibers of each fiber layer 6a, 6b is set to the fiber with the smallest fiber thickness. Comparer.

From the viewpoint of making the back sheet fluffy to improve the heat insulation effect and further improving the heat insulation of the heating appliance, the back sheet 6 preferably contains crimped fibers as its constituent fibers. As shown in FIG. 5, when the back sheet 6 has a laminated structure, it is preferable that at least one of the first fiber layer 6a and the second fiber layer 6b contains crimped fibers, and more preferably the first fiber layer 6a The crimped fiber is contained in both of and the 2nd fiber layer 6b.

The crimped fibers contained in the back sheet can be crimped two-dimensionally or three-dimensionally. Examples of crimped fibers include the following fibers: by heating latent crimped fibers such as concentric core-sheath type, eccentric core-sheath type composite fiber, or side-by-side composite fiber composed of two thermoplastic resins with different shrinkage rates. , And show a spiral curl. Examples of thermoplastic resins include polyesters such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polybutylene terephthalate (PBT), polyamides, or the like And other combinations. As another example, those described in Japanese Patent Laid-Open No. 9-296325 and the like can be cited. As the two types of thermoplastic resins with different shrinkage rates, the following fibers can be cited. That is, the core part of the core-sheath fiber uses a resin with a higher melting point, and the sheath part of the core-sheath fiber uses a resin with a lower melting point than the core. In other words, as the core/sheath, combinations of polypropylene/ethylene-propylene copolymer, polyethylene terephthalate/polyethylene, polyethylene terephthalate/polypropylene, and the like can be cited.

The degree of crimping of the fiber can be evaluated as, for example, the crimp rate and the number of crimps specified in JIS L 0208. The crimp rate is defined as the percentage of the difference between the length W1 when the fiber is drawn and the length W2 of the original fiber relative to the length W1 when the fiber is drawn, based on "100×(W1-W2)/W1(%)" etc. Calculated by the formula. The so-called original fiber length W2 refers to the length of the fiber that connects the two ends of the fiber in a straight line in its natural state. The so-called natural state refers to a state in which one end of the fiber is fixed to a horizontal board, and the fiber's own weight is used to hang downward. The so-called length W1 when the fiber is stretched refers to the length when it is stretched to the minimum load when the fiber is crimped.

The crimp ratio of the crimped fibers constituting the back sheet 6 is preferably 5% or more, more preferably 10% or more, still more preferably 30% or more, and preferably 80% or less, more preferably 70% or less, More preferably, it is 60% or less. In addition, the number of crimps per 1 cm is preferably 1 or more, more preferably 2 or more, preferably 10 or less, and more preferably 8 or less. In order to set such a crimp rate and the number of crimps, for example, it can be performed by appropriately adjusting the crimping treatment performed in the fiber manufacturing step, the material of the latent crimped fiber, the temperature of the heating treatment, and the like. As the back sheet 6 having crimped fibers satisfying the crimp ratio and the number of crimps, for example, a non-woven fabric manufactured by applying the latent crimped fiber having the above-mentioned core-sheath structure to the hot air method can be used. When the backside sheet 6 is a laminate of sheets, and crimped fibers are contained in each sheet, the above-mentioned crimp rate and the number of crimps are those that are satisfied independently by each sheet.

A part of the constituent fibers of the back sheet 6 may be crimped fibers, or all of the constituent fibers may be crimped fibers. From the viewpoint of improving heat retention, the ratio of crimped fibers contained in the back sheet 6 is preferably 20% or more, more preferably 30% or more, and preferably 100% or less, more preferably 80% or less . Regarding the ratio of crimped fibers, for example, randomly take out 10 fibers from the measurement target sheet, set the fiber that satisfies the above-mentioned crimp rate and crimp number as crimped fiber, and set either the crimp rate or the crimp number When the unsatisfied fiber is set as uncrimped fiber, it can be calculated based on the number of crimped fibers as the ratio of the number of crimped fibers.

From the viewpoint of increasing the voids in the back sheet 6 to improve the heat insulation effect and further improve the heat insulation of the heating appliance, the back sheet 6 is preferably based on solid fibers or instead of containing hollow ones. Fiber is used as its constituent fiber. As shown in FIG. 5, when the back sheet 6 has a laminated structure, at least one of the first fiber layer 6a and the second fiber layer 6b preferably contains hollow fibers, and more preferably at least the first fiber layer 6a Contains hollow fibers.

Hollow fibers have filaments containing single pores or porous cavities inside the fibers. From the viewpoint of improving the thermal insulation of the heating appliance, the percentage of the area of the hollow fiber as a hollow portion relative to the entire area of the cross section of the hollow fiber (the cross section orthogonal to the length direction of the fiber) is preferably 10% or more, more preferably 15% or more, and preferably 50% or less, more preferably 40% or less. Such hollow fibers can be manufactured by, for example, the following method: on one side, the melt or melt of the thermoplastic resin, which becomes the raw material of the hollow fiber, is ejected from the nozzle in a cylindrical shape, and on the other side, one end of the ejected cylindrical melt or melt is fused . The shape of the cross-section of the hollow fiber is not particularly limited. For example, a true circle or a non-true circle described later can be mentioned. The shape of the cross section of the hollow fiber can be appropriately changed by the size or shape of the nozzle used in the manufacture of the fiber. The hollow fiber can also become a hollow and crimped fiber by using the raw material used for the above-mentioned latent crimped fiber. The hollow and crimped fiber can be obtained, for example, by heating the potentially crimped fiber having the above-mentioned concentric or eccentric core-sheath structure and forming a cavity extending in the length direction of the fiber in the core portion.

The constituent fibers of the back sheet 6 may be fibers mixed with hollow fibers and solid fibers, or all of the constituent fibers may be solid fibers or hollow fibers. From the viewpoint of improving heat retention, the ratio of hollow fibers contained in the back sheet 6 is preferably 30% or more, more preferably 40% or more, and preferably 100% or less, and more preferably 80% or less. Regarding the ratio of hollow fibers contained in the back sheet 6, for example, 10 fibers can be randomly taken out from the measurement target sheet, and the cross section of the above fiber (the cross section perpendicular to the length direction of the fiber) can be observed with a scanning electron microscope. In this case, the ratio of the number of fibers with voids of 10% or more relative to the entire cross-sectional area of the fiber is calculated on the basis of the number of fibers.

From the viewpoint of making the heat retention and printability more excellent, the back sheet 6 is preferably based on a fiber whose cross-sectional shape is a true circle, or instead of a fiber whose cross-sectional shape is not true. Round shaped fibers are used as its constituent fibers. As shown in FIG. 5, when the back sheet 6 has a laminated structure, it is more preferable that at least one of the first fiber layer 6a and the second fiber layer 6b contains irregular fibers, and it is more preferable to constitute at least a heating device 1 The sheet on the outer surface contains shaped fibers. Moreover, it is also more preferable that at least the second fiber layer 6b contains irregular fibers.

The cross-sectional shape of the shaped fiber includes, for example, convex polygons such as triangles, quadrilaterals, pentagons, and hexagons, regular polygons, star-shaped polygons, ellipses, polylobal shapes, W-shaped, X-shaped, etc. The effect of the present invention is not particularly limited.

From the viewpoint of making the appearance of the heating appliance good, it is preferable to perform printing on the printing surface 6S of the back sheet 6 which is the side away from the skin of the user. The so-called “printing” means that the ink is attached to part or all of the printing surface 6S of the back sheet 6, and the back sheet 6 is colored to the same or different color as the base color of the sheet, so that characters, symbols, graphics, etc. can be visually recognized. Patterns, patterns, outlines, images, or combinations of these, etc. As described above, since the heating appliance of the present invention has a back sheet with a specific amount of voids, desired characters, patterns, etc. can be printed clearly, and as a result, the appearance of the heating appliance becomes good. The printing method on the back sheet is not particularly limited as long as it is a method capable of attaching ink to the sheet, and examples thereof include inkjet printing, rotary printing, flexographic printing, screen printing, gravure printing, and the like. The coating amount of the ink can be set at about 0.5 g/m ² or more and 1.5 g/m ² or less based on the basis weight based on the dry mass of the ink.

The shape of the ear hanging part 4 in the heating appliance 1 is not limited to the sheet-like member shown in FIGS. 1 and 2 as long as the main body 2 can be fixed to the eyes of the user. For example, as shown in FIG. 6, it is also possible to use the ear hanging part 4 including a rope-shaped member, or the ear hanging part 4 including a wire or ribbon-shaped member. From the viewpoint of improving the fit feeling of the heating appliance, it is preferable to use an elastic body such as rubber to form the stretchable ear hanger 4.

The shape of the heating element 3 in the heating appliance 1 is described as a form in which two heating elements 3 are held separately, but as long as it can impart a warm feeling to the eyes of the user and the surroundings, The form of the heating appliance is not particularly limited. For example, one heating element with a shape and size that can cover the eyes of the user and its surroundings can be held between the front sheet 5 and the back sheet 6, or three or more heating elements can be held on the front. Between the sheet 5 and the back sheet 6.

In addition, only a part of the heating element 3 shown in FIGS. 2 and 3 is fixed in the central area of the horizontal X of the heating appliance 1, but it is not limited to this form. For example, the heating element 3 and the back sheet 6 can be joined continuously or intermittently in the central area and the area other than the central area by using an adhesive, or the heating element 3 can be placed in the back sheet 6 at the position where the heating element 3 is to be arranged. Adhesive is applied to the entire surface for bonding.

As mentioned above, the present invention has been described based on its preferred embodiments, but the present invention is not limited to the above-mentioned embodiments. For example, the back sheet 6 may include hollow fibers and crimped fibers, each of which may independently include these fibers, or may include a plurality of hollow and crimped fibers. In the case of hollow and crimped fibers, the fibers are preferably included in at least one of the first fiber layer 6a and the second fiber layer 6b, and more preferably included in the first fiber layer 6a and the second fiber Both of layer 6b. Each form of the back sheet 6 may further include solid fibers. Regarding hollow and crimped fibers, the above descriptions of hollow fibers and crimped fibers are appropriately applied. In either case, the effect of the present invention can be fully exerted.

Regarding the above-mentioned embodiments of the present invention, the following heating appliances are further disclosed. <1> A heating appliance, comprising: a main body, which has a shape that covers the eyes of the user when in use; a heating element, which is provided on the main body; and a pair of hanging ear parts, which are installed on the main body And it can maintain the covering state of the main body to the eyes of the user; the main body is provided with: a front sheet, which is located on the side close to the user's skin; and a back sheet, which is located on the side away from the user's skin; The heating element is held between the front sheet and the back sheet; and the amount of voids per unit area of the back sheet is 1000 cm ³ /m ² or more and 6000 cm ³ /m ² or less.

＜2＞ Such as the heating appliance in the above <1>, wherein the heating appliance has a transverse direction corresponding to the length direction and a longitudinal direction orthogonal to the transverse direction, A plurality of the heating elements are held between the front sheet and the back sheet so as to be spaced apart from each other in the lateral direction. ＜3＞ The heating appliance of the above-mentioned <1> or <2>, wherein the above-mentioned front sheet and the above-mentioned back sheet both have air permeability. ＜4＞ The heating appliance according to any one of the above <1> to <3>, wherein the heating element includes an oxidizable metal, a reaction accelerator, an electrolyte, and water. ＜5＞ The heating appliance of the above-mentioned <4>, wherein the heating system is a heating sheet composed of a fibrous sheet further containing fibrous materials. ＜6＞ The heating appliance of the above-mentioned <4>, wherein the heating element is composed of a heating composition further containing a water-retaining agent.

<7> The heating appliance of any one of the above <1> to <6>, wherein the heating appliance has a transverse direction corresponding to the longitudinal direction and a longitudinal direction orthogonal to the transverse direction, the back sheet and the heating element It is fixed via the connecting fixing part, and the connecting fixing part is arranged in the transverse central area of the heating appliance. <8> The heating appliance of any one of the above <1> to <7>, wherein the heating appliance has a transverse direction corresponding to the length direction and a longitudinal direction orthogonal to the transverse direction, and the ear hangers are in two of the transverse directions The outer end area is joined to the outer surface of the front sheet, and a joining area where the body part and the ear hanger part are joined is formed. <9> The heating appliance according to the above <8>, wherein the joint area is formed by continuously or intermittently joining the body part and the ear strap part. <10> The heating appliance of any one of the above <1> to <9>, wherein the amount of voids per unit area of the back sheet is preferably 1000 cm ³ /m ² or more, more preferably 1500 cm ³ /m ² or more, more preferably 2000 cm ³ /m ² or more, still more preferably 2500 cm ³ /m ² or more, and preferably 6000 cm ³ /m ² or less, more preferably 5000 cm ³ /m ² Hereinafter, it is more preferably 4000 cm ³ /m ² or less, and still more preferably 3000 cm ³ /m ² or less.

<11> The heating appliance according to any one of the above <1> to <10>, wherein the back sheet is a non-woven fabric that has been subjected to at least one of hot air treatment, thermal bonding treatment, and needle punching treatment. <12> The heating appliance of any one of the above <1> to <11>, wherein the back sheet is a non-woven fabric that has been subjected to hot air treatment and thermal bonding treatment. <13> The heating appliance of any one of the above <1> to <12>, wherein the front sheet is a non-woven fabric, and the basis weight of the front sheet is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, preferably 200 g/m ² or less, more preferably 130 g/m ² or less. <14> The heating appliance of any one of the above <1> to <13>, wherein the back sheet is a non-woven fabric, and the basis weight of the back sheet is preferably 15 g/m ² or more, more preferably 30 g/m ² or more, preferably 105 g/m ² or less, more preferably 75 g/m ² or less. <15> The heating appliance of any one of the above <1> to <14>, wherein the back sheet is provided with: a first fiber layer, which is located on the side close to the user's skin; and a second fiber layer, which Located on the side away from the skin of the user; and the fiber thickness of the constituent fibers of the second fiber layer is smaller than the thickness of the constituent fibers of the first fiber layer.

<16> The heating appliance of the above <15>, wherein the back sheet has a single structure including a sheet having a first fiber layer and a second fiber layer. <17> The heating appliance according to the above <15>, wherein the back sheet has a composite structure in which a sheet constituting the first fiber layer and a sheet constituting the second fiber layer are stacked. <18> The heating appliance of the above <17>, wherein the basis weight of the sheet constituting the first fiber layer is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 70 g/m ² or less, more preferably 50 g/m ² or less. <19> The heating appliance of the above <17> or <18>, wherein the basis weight of the sheet constituting the second fiber layer is preferably 5 g/m ² or more, more preferably 10 g/m ² or more, and It is preferably 35 g/m ² or less, and more preferably 25 g/m ² or less.

＜20＞ The heating appliance of any one of the above <15> to <19>, wherein the fineness of the fibers constituting the first fiber layer is preferably 1.5 dtex or more, more preferably 2.0 dtex or more, and preferably 10.0 dtex or less, More preferably, it is 5.0 dtex or less. ＜21＞ The heating appliance of any one of the above <15> to <20>, wherein the fineness of the constituent fibers of the second fiber layer is preferably 0.8 dtex or more, more preferably 1.0 dtex or more, and preferably 2.0 dtex or less, More preferably, it is 3.0 dtex or less. ＜22＞ The heating appliance according to any one of the above <1> to <21>, wherein the back sheet includes crimped fibers. ＜23＞ The heating appliance according to any one of the above <15> to <21>, wherein at least one of the first fiber layer and the second fiber layer contains crimped fibers. ＜24＞ The heating appliance according to any one of the above <15> to <21>, wherein both the first fiber layer and the second fiber layer contain crimped fibers.

＜25＞ The heating appliance of any one of the above <22> to <24>, wherein the crimped fiber comprises a concentric core sheath type or an eccentric core sheath type composite fiber, The core/sheath combination in the composite fiber is polypropylene/ethylene-propylene copolymer, polyethylene terephthalate/polyethylene, or polyethylene terephthalate/polypropylene. ＜26＞ The heating appliance of any one of the above <22> to <25>, wherein the crimp rate of the crimped fiber is preferably 5% or more, more preferably 10% or more, and even more preferably 30% or more, and It is preferably 80% or less, more preferably 70% or less, and still more preferably 60% or less. ＜27＞ The heating appliance of any one of the above <22> to <26>, wherein the number of crimps of the crimped fiber per 1 cm is preferably 1 or more, more preferably 2 or more, and preferably 10 Below, more preferably 8 or less. ＜28＞ The heating appliance of any one of the above <22> to <27>, wherein the ratio of crimped fibers contained in the back sheet is preferably 20% or more, more preferably 30% or more based on the number of fibers, And it is preferably 100% or less, more preferably 80% or less.

＜29＞ The heating appliance according to any one of the above <1> to <28>, wherein the above-mentioned back sheet contains hollow fibers. ＜30＞ The heating appliance of any one of the above-mentioned <15> to <21> and <23> to <28>, wherein at least the second fiber layer contains hollow fibers. ＜31＞ For the heating appliance of the above <29> or <30>, the hollow fiber hollow ratio is preferably 10% or more, more preferably 15% or more, and preferably 50% or less, and more preferably 40% or less. ＜32＞ The heating appliance of any one of the above <29> to <31>, wherein the ratio of hollow fibers contained in the back sheet is preferably 30% or more, more preferably 40% or more based on the number of fibers, and Preferably it is 100% or less, more preferably 80% or less. ＜33＞ The heating appliance according to any one of the above <1> to <32>, wherein the above-mentioned back sheet comprises irregularly shaped fibers whose cross-section of the fiber is not a true circle. ＜34＞ Such as the heating appliance of any one of the above <15> to <21>, <23> to <28>, and <30> to <32>, wherein at least the shape of the cross-section of the fiber contained in the second fiber layer is not True round shaped fibers.

＜35＞ The heating appliance according to any one of the above <1> to <34>, wherein the back sheet includes hollow and crimped fibers and solid fibers. ＜36＞ Such as the heating appliance of any one of the above <15> to <21>, <23> to <28>, <30> to <32>, and <34>, wherein at least the first fiber layer and the second fiber layer One includes hollow and crimped fibers and solid fibers. ＜37＞ Such as the heating appliance of any one of the above <15> to <21>, <23> to <28>, <30> to <32>, and <34>, wherein two of the first fiber layer and the second fiber layer It includes hollow and crimped fibers and solid fibers. ＜38＞ Such as the heating appliance of any one of the above <15> to <21>, <23> to <28>, <30> to <32>, <34>, and <36>, wherein the first fiber layer contains a hollow And crimped fiber and solid fiber. ＜39＞ The heating appliance of any one of the above <1> to <38>, wherein printing is performed on the side of the back sheet that is away from the skin of the user. ＜40＞ The heating appliance according to any one of the above <1> to <39>, wherein the ear hanging part includes a sheet material, and an insertion part for the ear to pass through is formed on the sheet material. ＜41＞ The heating appliance according to any one of the above <1> to <39>, wherein the ear hanging part includes a rope-shaped, thread-shaped or ribbon-shaped member. ＜42＞ Such as the heating appliance of the above <41>, wherein the above-mentioned member is an elastic body. Example

Hereinafter, the present invention will be explained in more detail using examples. However, the scope of the present invention is not limited to this embodiment.

[Example 1] As the front sheet 5, the following needle-punched non-woven fabric was used as a single layer: a solid fiber made of polypropylene and a fineness of 1.0 dtex and a polypropylene and ethylene-propylene copolymer as the raw material Laminated fiber with a fineness of 2.2 dtex and a basis weight of 80 g/m ² . As the back sheet 6, the following sheets were used. That is, the first raw material assembly (basis weight 20 g/m ² ) and the second raw material assembly (basis weight 10 g/m ² ) are mixed, and the first raw material assembly contains only polyethylene terephthalate. Ester (hereinafter, also referred to as polyester) as the core, polyethylene as the sheath of the eccentric and hollow latent crimp core sheath fiber (fineness 2.8 dtex, hollow rate 15%), the second raw material assembly only contains poly The solid core-sheath fibers (denier 2.8 dtex) with ester as the core and polyethylene as the sheath are subjected to hot air treatment by blowing an air stream at 140°C for 10 seconds on the raw material assemblies to produce a fiber assembly containing crimped fibers. . Thereafter, using a hot roller with a front surface temperature of 124° C., the above-mentioned fiber assembly was extruded at 0.3 MPa and thermally bonded to form a back sheet 6 including one sheet. The back sheet 6 is a sheet with a single structure as follows: the hollow and crimped fibers derived from the first aggregate of raw materials are mixed with the solid fibers derived from the second aggregate of raw materials, and the aggregates cannot be peeled off . The basis weight of the back sheet 6 is 30 g/m ² , the ratio of crimped fibers and hollow fibers is 50%, and the amount of voids is 1635 cm ³ /m ² . The heating element 3 is produced in accordance with the materials and methods described in Japanese Patent Laid-Open No. 2003-102761, and becomes a heating sheet containing an oxidizable metal, a water-retaining material, a fibrous material, an electrolyte, and water. The back sheet 6 is arranged in such a way that the second fiber layer 6b is arranged on the surface away from the skin of the user. In this state, the sheet-shaped heating element 3 is held between the front sheet 5 and the back sheet 6, and the manufacturing diagram The heating appliance shown in 1.

[Example 2] A heating appliance was produced in the same manner as in Example 1, except that the following sheet was used as the back sheet 6. As the back sheet 6, a first raw material fiber assembly (basis weight 20 g/m ² ) and a second raw material fiber assembly (basis weight 10 g/m ² ) are stacked to form a raw material laminate. The first raw material fiber The assembly includes an eccentric and hollow latent crimped core sheath fiber with polyester as the core and polyethylene as the sheath (denier 2.8 dtex, hollow rate 15%), and a solid core with polyester as the core and polyethylene as the sheath. The core-sheath fiber (denier 2.8 dtex) of two kinds of fibers, the second raw fiber assembly only contains the solid core-sheath fiber (denier 1.7 dtex) with polyester as the core and polyethylene as the sheath. The body was subjected to hot air treatment under the same conditions as in Example 1 to produce a laminated body including crimped fibers and a plurality of fiber layers. Thereafter, under the same conditions as in Example 1, the surface of the laminate on the side where the second raw material sheet was present was subjected to a thermal bonding process to form a back surface of a single structure including a plurality of fiber layers and no peeling between the layers Sheet 6. In detail, the back sheet 6 is a sheet of a single structure including one sheet of two fiber layers having a first fiber layer 6a and a second fiber layer 6b, and the first fiber layer 6a has a hollow and crimped shape. For both the fiber and the solid fiber, the second fiber layer 6b only has the solid fiber. The basis weight of the back sheet 6 of this embodiment is 30 g/m ² , and the void volume is 1695 cm ³ /m ² .

[Example 3] A heating appliance was manufactured in the same manner as in Example 1, except that the following sheet was used as the back sheet 6. As the back sheet 6, the first raw material fiber assembly (basis weight 30 g/m ² ) and the second raw material fiber assembly (basis weight 15 g/m ² ) are stacked to form a raw material laminate. The first raw material fiber The assembly includes an eccentric and hollow latent crimped core sheath fiber with polyester as the core and polyethylene as the sheath (denier 2.8 dtex, hollow rate 15%), and a solid core with polyester as the core and polyethylene as the sheath. The core-sheath fiber (denier 2.8 dtex) of two kinds of fibers, the second raw fiber assembly only contains the solid core-sheath fiber (denier 1.7 dtex) with polyester as the core and polyethylene as the sheath. The body was subjected to hot air treatment under the same conditions as in Example 1 to produce a laminated body including crimped fibers and a plurality of fiber layers. Thereafter, under the same conditions as in Example 1, the surface of the laminate on the side where the second raw fiber assembly was present was subjected to a thermal bonding process to form a single structure including a plurality of fiber layers and no peeling between the layers. Back sheet 6. The back sheet 6 is a sheet of a single structure including one sheet of two fiber layers with a first fiber layer 6a and a second fiber layer 6b. The first fiber layer 6a has hollow and crimped fibers and solid cores. Of the two fibers, the second fiber layer 6b has solid fibers. The basis weight of the back sheet 6 of this embodiment is 45 g/m ² , and the void volume is 2533 cm ³ /m ² .

[Example 4] A heating appliance was produced in the same manner as in Example 1, except that the following sheet was used as the back sheet 6. As the back sheet 6, the first raw material fiber assembly (basis weight 30 g/m ² ) and the second raw material fiber assembly (basis weight 15 g/m ² ) are stacked to form a raw material laminate. The first raw material fiber The assembly includes an eccentric and hollow latent crimped core sheath fiber with polyester as the core and polyethylene as the sheath (denier 2.8 dtex, hollow rate 15%), and a solid core with polyester as the core and polyethylene as the sheath. The core-sheath fiber (denier 2.8 dtex) of two kinds of fibers, the second raw fiber assembly only contains the solid core-sheath fiber (denier 1.7 dtex) with polyester as the core and polyethylene as the sheath. The body was subjected to hot air treatment under the same conditions as in Example 1 to produce a laminated body including crimped fibers and a plurality of fiber layers. After that, under the same conditions as in Example 1, the surface of the laminate on the side where the second raw fiber assembly was present was subjected to a thermal bonding process to produce a fiber assembly including a single-structure sheet that cannot be peeled between the layers. Body A (basis weight 45 g/m ² ). In addition, the first raw material assembly (basis weight 20 g/m ² ) and the second raw material assembly (basis weight 10 g/m ² ) were mixed. Ethylene is an eccentric and hollow latent crimped core sheath fiber (fineness 2.8 dtex, hollow rate 15%). The second raw material assembly only contains solid core sheath fibers with polyester as the core and polyethylene as the sheath. (Fineness 2.8 dtex), for these ^{raw material aggregates with a basis weight of 30 g/m 2} , blow an air stream at 140°C for 10 seconds and perform hot air treatment to produce a single structure that contains crimped fibers and that cannot be peeled off between layers The fiber assembly B of the sheet. The obtained fiber assembly A and the fiber assembly B were bonded with a hot melt adhesive to form a back sheet 6 of a single structure ^{including a plurality of sheets, a basis weight of 75 g/m 2 and non-peelable interlayers.} The back sheet 6 is a sheet with a single structure as follows: two fiber layers including a first fiber layer 6a of a two-layer structure and a second fiber layer 6b of a two-layer structure that cannot be peeled off, the first fiber layer 6a having A fiber assembly B including both hollow and crimped fibers and solid fibers, the second fiber layer 6b has a fiber assembly A including both hollow and crimped fibers and solid fibers, and the fiber assembly The second raw material sheet in the body A forms the printing surface. The void volume is 5113 cm ³ /m ² .

[Comparative Example 1] As the back sheet 6, a spunlace non-woven fabric (basis weight 40 g/m ² ) containing polyester fiber with a fineness of 1.7 dtex was used alone, and the non-woven fabric was not subjected to hot air treatment and thermal bonding treatment, except for this Except this, the heating appliance was manufactured in the same manner as in Example 1. The void volume of the back sheet 6 is 501 cm ³ /m ² .

[Evaluation of heat retention] The heat retention of the back sheet was evaluated by the following method. As a measurement sample, on a measurement device (Peltier 210 manufactured by Intercross Corporation) with a temperature sensor and a heat flux meter, the back sheet used in the embodiment or the comparative example with a size of 4 cm×3 cm is placed on the back The sheet is arranged on the side close to the user's skin for surface contact, and the back sheet is arranged on the side far away from the user's skin with a non-breathable size of the same size as the sheet A sheet (a laminate of paper and resin), and the sheet is fixed to the measuring device. Next, under an environment of 20°C and 50%RH, heat is applied in the order of the temperature distribution (1) to (3) shown below, and the change in ^{heat flux (W/m 2) is measured over time. In addition, the change in the heat flux (W/m 2} ) only when the non-air-permeable sheet is fixed as the control sample by the measuring device is also measured in the same way. These measurements were performed twice, and the average value of each was set as the average heat flux. The thermal insulation evaluation is the difference between the average heat flux under the temperature distribution (3) of the measured sample and the average heat flux under the temperature distribution (3) of the target sample as the thermal insulation effect index (W/m ² ). The higher the heat preservation effect index, the higher the heat preservation. The results are shown in Table 1 below.

＜Temperature distribution＞ (1) Before measurement: Fix at 30°C for 5 minutes (2) Measurement start (0 seconds) to 100 seconds: a constant temperature rise from 30°C to 50°C (3) 100 seconds to 280 seconds: fixed at 50°C

〔Evaluation of skin temperature〕 Let people wear the heating appliances of the embodiment and the comparative example, and install a temperature sensor (manufactured by Gram Corporation, model: LT-8 series LT-ST08-12) on the skin of the part that is in contact with the front sheet 5, with The change in skin temperature (°C) is measured over time. The measurement environment was set to 15°C and 50%RH, and the measurement time was set to 30 minutes. The highest reaching temperature (°C) and 38°C duration (minutes) on the 5 side of the front sheet were measured. The measurement of the highest reached temperature was carried out twice, and set as the average value. In this evaluation, the higher the reaching temperature and the longer the duration, the higher the heat retention. The results are shown in Table 1 below.

[Evaluation of Printability] The printing surface of the back sheet 6 used in the Examples and Comparative Examples was printed using flexographic printing and oil-based flexographic ink, and printing including characters was performed. In Examples 1 to 4, printing was performed on the outer side of the second fiber layer 6b. The coating amount of the ink is 1 g/m ² based on the dry mass, and the compression degree by printing is 45%. The printability was evaluated based on the following criteria. The results are shown in Table 1 below.

<Evaluation criteria> A: The outline of the printed text is clear, and the text can be easily recognized. B: The outline of the printed text is slightly blurred, but the text can be recognized. C: The printed text is white or the outline of the text is blurred, and the text cannot be recognized.

〔Evaluation of usability〕 Let 5 professional sensory inspectors wear the heating appliances of the examples and comparative examples, and use the following criteria to evaluate the feeling of use of the heating appliances. Calculate the arithmetic average of the evaluation points of each panelist to evaluate the feeling of use. If the arithmetic mean of the evaluation points is 2 points or more, it means that the warming appliance has a good feeling in use. The results are shown in Table 1 below.

＜Evaluation criteria of usability＞ 3 points: The weight is not felt when wearing, and the feeling of use is very good. 2 points: The weight may be felt when wearing, but the feeling of use is good. 1 point: The weight is strongly felt when wearing, and it is uncomfortable.

[Table 1] Example 1 Example 2 Example 3 Example 4 Comparative example 1 The form of the back sheet Multi-layer + single structure Multi-layer + single structure Multi-layer + single structure Multi-layer + single structure Single layer + single structure The amount of voids of the back sheet (cm ³ /m ² ) 1635 1695 2533 5113 501 Heat preservation Thermal insulation effect index (W/m ² ) 6.29 6.27 8.37 10.53 2.20 Skin temperature Maximum reach temperature (℃) 40.2 40.2 40.7 41.0 39.1 Duration above 38℃ (minutes) 15.8 16.0 18.4 21.0 13.3 Printability B A A A A Sense of use 3.0 3.0 2.6 2.0 3.0

As shown in Table 1, it can be seen that the heating appliances of each example using a back sheet with a specific amount of voids have higher heat retention than the heating appliances of the comparative example, and can provide users with a suitable temperature for a long time. hot. In addition, it can also be seen that the heating appliances of the Examples and Comparative Examples have higher printability and a good feeling in use. Therefore, it can be seen that the heating appliance of the present invention has both heat retention and printability and is excellent, and besides this, the feeling in use is also good. [Industrial availability]

According to the present invention, there is provided a heating appliance that has both heat preservation and printing properties and is excellent.

1: heating appliances 2: body part 3: heating element 4: ear hanging 4A: Insertion part 5: Front sheet 6: Back sheet 6a: the first fiber layer 6b: 2nd fiber layer 6S: Printing surface 7: Adhesive 7a: Next to the fixed part 9: Joint area 9s: Joint end X: horizontal Y: vertical

Fig. 1 is a plan view showing an embodiment of the heating appliance of the present invention. Fig. 2 is an exploded perspective view of the heating appliance shown in Fig. 1; Fig. 3 is a cross-sectional view of the heating appliance shown in Fig. 1 along the length direction. Fig. 4 is an enlarged cross-sectional view of the heating appliance shown in Fig. 3. Fig. 5 is an enlarged cross-sectional view showing another embodiment of the heating device of the present invention. Fig. 6 is a plan view showing another embodiment of the heating appliance of the present invention.

1: heating appliances

2: body part

3: heating element

4: ear hanging

4A: Insertion part

X: horizontal

Y: vertical

Claims (16)

A heating appliance, comprising: a main body, which has a shape that covers the eyes of a user when in use; a heating element, which is provided on the main body; and a pair of ear parts, which are installed on the main body and can be maintained The body part covers the user's eyes; the body part is provided with: a front sheet, which is located on the side close to the user's skin; and a back sheet, which is located on the side away from the user's skin; the heating element Keep between the front sheet and the back sheet; the void per unit area of the back sheet is 1000 cm ³ /m ² or more and 6000 cm ³ /m ² or less; and the back sheet is far away from the user There is printing on the side of the skin. The heating appliance of claim 1, wherein the back sheet is provided with: a first fiber layer located on the side close to the user's skin; and a second fiber layer located on the side away from the user's skin. Such as the heating appliance of claim 2, wherein the fiber thickness of the constituent fibers of the second fiber layer is smaller than the thickness of the constituent fibers of the first fiber layer. The heating appliance of claim 2, wherein the back sheet has a single structure including a sheet having a first fiber layer and a second fiber layer. Such as the heating appliance of claim 2, wherein the above-mentioned back sheet is a sheet that will constitute the first fiber layer The composite structure is formed by overlapping the sheet material and the sheet material constituting the second fiber layer. The heating appliance of claim 2, wherein at least one of the first fiber layer and the second fiber layer includes hollow and crimped fibers and solid fibers. The heating appliance of claim 1, wherein the back sheet includes crimped fibers. The heating appliance of claim 6, wherein the crimped fiber comprises a concentric core-sheath type or an eccentric core-sheath type composite fiber, and the core/sheath combination in the composite fiber is polypropylene/ethylene-propylene copolymer and polymer Ethylene phthalate/polyethylene, or polyethylene terephthalate/polypropylene. The heating appliance of claim 6, wherein the ratio of crimped fibers contained in the back sheet is 20% or more and 100% or less based on the number of fibers. The heating appliance of claim 1, wherein the back sheet includes hollow fibers. Such as the heating appliance of claim 6, wherein the hollow fiber hollow ratio of the above-mentioned hollow fiber is 10% or more and 50% or less. The heating appliance of claim 6, wherein the ratio of hollow fibers contained in the back sheet is 30% or more and 100% or less based on the number of fibers. The heating appliance of claim 1, wherein the back sheet is a non-woven fabric that has been subjected to at least one of hot air treatment, thermal bonding treatment, and needle punching treatment. Such as the heating appliance of claim 1, wherein the above-mentioned back sheet is a non-woven fabric that has been subjected to hot air treatment and thermal bonding treatment. The heating appliance of claim 1, wherein the back sheet includes hollow and crimped fibers and solid fibers. The heating appliance of claim 6, wherein the first fiber layer contains hollow and crimped fibers and solid fibers.

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