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Heat Generating Body and Process For Producing Heat Generating Body

a heat generating body and heat generating technology, applied in the field of heat generating bodies, can solve the problems of lowering productivity, sealing failure, extra-low speed, etc., and achieve the effect of improving productivity and speeding up the line speed

Inactive Publication Date: 2008-08-28
MYCOAL PRODS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a heat generating body and a process for producing it. The technical problem addressed by the invention is to provide a heat generating body that can be securely sealed without generating wrinkles, achieving higher line speed, and is free from seal failure. The invention solves this problem by forming a temporary adhering part upon temporary adhesion between a substrate and a heat generating composition molded body, and a covering material with an adhesive layer and subsequently heat sealing it.

Problems solved by technology

In these conventional heat generating bodies, in the case where the outer peripheries of the substrate and the covering material are entirely heat sealed, there are encountered the following problems.
Therefore, a limit for realizing high speed is generated, resulting in a lowering of the productivity.
Furthermore, in the case where a heat generating composition molded body is laminated on a substrate, a covering material is covered thereon, and the surroundings of the heat generating composition molded boy are heat sealed by heat fusion or heat bonding, there is some possibility that the heat generating composition molded body moves between the substrate and the covering material, thereby causing seal failure.
In particular, in the case the volume of the heat generating composition molded body is small and a seal width is small, such became especially remarkable, resulting in an extra-low speed.
However, according to the foregoing adhesive sealing, a seal strength is lowered depending upon the utility at the time of using the heat generating body, the heat generation due to seal separation becomes instable so that there is created an anxiety such a burn.
Thus, its use and utility were limited.
Even when a temperature lower than the melting point of the adhesive layer is partially applied to achieve warm treatment and sealing, there was encountered a problem such that its effect is not so high, seal separation occurs and seal failure is caused, thereby causing abnormal heat generation.
As a matter of course, there are encountered exactly the same problems in the sticking agent to be used in this conventional heat generating body.

Method used

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  • Heat Generating Body and Process For Producing Heat Generating Body
  • Heat Generating Body and Process For Producing Heat Generating Body
  • Heat Generating Body and Process For Producing Heat Generating Body

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0435]As shown in FIG. 1 which is a plan view and FIG. 2 which is a cross-sectional view along the line Z-Z of FIG. 1, a heat generating body 1 of the invention is one in which a heat generating composition molded body 1A is sealed in a rectangular flat accommodating bag of 130 mm in length×80 mm in width, and the accommodating bag is made of an air-impermeable substrate 4 and an air-permeable covering material 5. On the exposed surface side of the substrate 4, a separator 13 made of a polyester-made release film having a thickness of 38 μm is provided via an adhesive layer 9 which is made of a non-aromatic polyolefin based hot melt based adhesive having a basis weight of 150 g / m2.

[0436]The covering material 5 is made of an extensible three-layered film having a width of 130 mm. That is, a porous film having a basis weight of 50 g / m2 is laminated on a polyester-made spunlace non-woven fabric having a basis weight of 30 g / m2 via a hot melt based sticky layer as provided by a melt blo...

example 2

[0445]FIG. 5 is an example of the heat generating body 1 in which a sectional exothermic part 1B is provided by 3 lines and 4 rows in the same manner as in Example 1. A perforation 12 is provided in the heat seal part 11. Seal failure was not observed.

example 3

[0446]FIG. 6 is an example of the heat generating body 1 having a sectional exothermic part 1B as produced by using the same substrate 4, covering material 5 and heat generating composition as in Example 1. The heat generating composition molded body 1B as formed in dimensions of 110 mm×70 mm×0.5 mm at intervals of 20 mm in the central part of a substrate 4 by force-through molding while drawing out the substrate 4 as wound in a roll-like form in a width of 130 mm at 35 m / min in the horizontal direction was disposed at intervals of 20 mm by 4 lines and 3 rows. A covering material as prepared by coating 1 g / m2 of a hot melt based adhesive on the porous film surface side by a melt blow system was covered on the heat generating composition molded body 1B, and the outer periphery of the substrate 4 and the covering material and the adjacent sectional exothermic parts 1B were temporarily adhered by adhesion. Thereafter, the resultant was heat sealed by using three heat seal rolls and cut...

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PUM

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Abstract

There is provided a heat generating body which by forming a temporary adhering part upon temporary adhesion between a substrate and a heat generating composition molded body and a covering material with an adhesive layer and subsequent heat sealing, realizes higher line speed, thereby largely improving the productivity, does not generate position deviation of the heat generating composition molded body in welding the substrate and the covering material, is able to be heat sealed and is free from seal failure.A heat generating body as formed by laminating a heat generating composition molded body resulting from molding of a heat generating composition containing, as essential components, an exothermic substance, a carbon component, a reaction accelerator and water and having a water mobility value of from 0.01 to 20 on a substrate, covering by a covering material and heat sealing the periphery of the heat generating composition molded body, is characterized in that the substrate and the covering material are temporarily adhered with a sticky layer, the temporarily adhered portion is heat sealed with a heat seal layer which the substrate and / or the covering material has, the sticky layer component and the heat seal layer component are co-present in the heat seal part, and the heat seal part has a seal strength at 60° C. of 0.8 kg / 25 mm or more.

Description

TECHNICAL FIELD[0001]The present invention relates to a heat generating body which upon temporary adhesion of a substrate and a covering material with an adhesive layer and subsequent heat sealing, is able to be surely heat sealed without generating wrinkles, realizes higher line speed, thereby largely improving the productivity and is free from seal failure and to a process for producing the same.BACKGROUND ART[0002]In recent years, there have been proposed heat generating bodies having a heat generating composition sealed in a bag body in which at least one surface thereof is made of a air-permeable film (or a sheet) and thermal wet packs in which an adhesive layer is laminated on one surface of a heat generating body, thereby enabling to be stuck to a human body or the like. As so-called throwaway body warmers and thermal wet packs, there have also been proposed ones utilizing a warming measure or a medical hot pack and ones utilizing a so-called percutaneous absorption system in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F24J1/00B65B51/16F24V30/00
CPCA61F7/034A61F2007/0098F24J1/00C09K5/18A61F2007/0268F24V30/00
Inventor DODO, TOSHIHIRO
Owner MYCOAL PRODS CORP