JPH0675436U - Sheet material for disposable body warmers - Google Patents

Abstract

(57) [Summary] [Purpose] A biodegradable packaging material for disposable body warmers. [Structure] A non-woven fabric in which a web composed of cellulosic natural fibers is fixed by an interfiber binder composed mainly of chitosan, and a film sheet composed mainly of starch composed of a natural polymer are bonded and adhered to each other. Material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet material for packaging a disposable body warmer.

[0002]

[Prior art and its problems]

 A disposable body warmer that consists of a breathable sheet that contains iron powder or other oxidizable metal powder as a main component and that generates heat when it contacts air is a simple, lightweight and economical portable product. Although it is used in large quantities as a body heating element, the breathable sheet that stores the body is made of petroleum plastic such as polyethylene. However, most of them are disposed of after being used as disposable body warmers, and are either disposed of and discarded as incineration or household waste or abandoned in the mountains. Environmental pollution due to plastic waste has become a social problem because it does not easily corrode or decompose in the soil when it emits harmful gas and is landfilled as household waste.

[0003]

[Problems to be solved by the present invention]

 Currently, in addition to petroleum-based plastics that emit harmful gases and do not decompose in soil, biodegradable plastics that are decomposed by microorganisms in the soil have been developed. Possible synthetic polymers or natural polymers of plant or animal origin are considered. If these biodegradable plastics are used as packaging materials for disposable body warmers, they have the same strength and heat resistance as petroleum-based plastics during use, and even after being embedded in soil after use, they are microbially decomposed in soil. The subject was to develop a decomposed product of shiso as a sheet material for packaging bags for body warmers, which has the property of not polluting the environment.

[0004]

[Means for Solving the Problems]

 To achieve the above object, the present invention is based on a biodegradable non-woven fabric in which a fiber web composed of cellulose-based natural fibers is fixed by an interfiber binder mainly composed of salt chitosan, and a starch composed of a natural polymer as a main component. The sheet material for wrapping a disposable body warmer constructed by bonding and adhering a biodegradable film sheet as described above is used as a means.

[0005]

【Example】

 In the drawing, 1 is a biodegradable nonwoven fabric and 2 is a biodegradable natural polymer film sheet. Nonwoven fabric 1 is a fiber web composed of rayon, a natural cellulose-based fiber that is the main ingredient of cotton, and hydrolyzed chitin contained in shells of shrimps and crabs and cell walls of insects and fungi with a concentrated alkaline solution. The salt chitosan obtained in this way is processed as a binder between fibers to form a biodegradable nonwoven fabric. Next, the biodegradable film sheet 2 is a film sheet whose main component is starch containing a natural polymer such as rice and corn. Reference numeral 3 is a communication hole provided in each sheet. The communication hole may be provided on only one side of the sheet, or may be only the breathable sheet. The film sheet is processed by adding modified polyvinyl alcohol, water and other additives as appropriate to make it thermoplastic so that it can be easily formed, or it is porous with communication holes 3 like the biodegradable nonwoven fabric of the film sheet 1, or A biodegradable film of polyethylene formed or milky white as a breathable perforated sheet. The biodegradable nonwoven fabric 1 and the biodegradable natural polymer film sheet 2 are bonded and attached by a processing means such as hot melt or extrusion thermoforming to form an integrated film sheet 4 shown in FIG. The heat resistant temperature of the film sheet is about 120 ° C or lower. FIG. 3 is a cross-sectional view of a disposable body warmer 5 in which the film sheet body 4 of the present invention is used as a packaging material for a body warmer. The exothermic composition 6 is enclosed. 7 is an airtight outer bag.

[0006]

【effect】

 The present invention is a biodegradable sheet material for a disposable body warmer having the above-mentioned structure, which is a biodegradable nonwoven fabric and a composite film to which a starch-based polymer biodegradable film is attached. It is a material completely decomposed by microorganisms, and it has been proved that the decomposition in soil takes about 1 month in summer and about 2 months in winter, and it is effective as a film sheet material without environmental pollution. As for the packaging material for body warmers, the heat resistance as well as the flexibility and tensile strength of the body warmer due to the heat-generating composition is 50 ° C to 60 ° C, and the maximum temperature is 70 ° C, which is higher than 65 ° C to 80 ° C. A heat resistance effect of ~ 120 ° C can be expected.

[Brief description of drawings]

FIG. 1 is a perspective view of a film sheet material according to the present invention.

FIG. 2 is a cross-sectional view in which a film sheet as a packaging material for a body warmer is attached.

FIG. 3 is a sectional view of a disposable body warmer according to an embodiment of the present invention.

[Explanation of symbols]

 1 biodegradable non-woven fabric 2 biodegradable polymer film sheet 3 communicating hole 4 film sheet for body warmer packaging 5 disposable body warmer 6 exothermic composition 7 airtight outer bag

Claims (1)

[Scope of utility model registration request] 1. A packaging bag made of a breathable sheet containing a heat-generating composition which generates heat when contacted with air, wherein a fiber web composed of natural cellulose fibers is formed by an interfiber binder mainly composed of chitosan. A sheet material for wrapping a disposable body warmer, which is configured by joining and adhering a fixed non-woven fabric and a film sheet whose main component is starch made of a natural polymer.