JP2006017599A - Humidity sensing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidity sensing material not producing a paper powder or dust. <P>SOLUTION: The humidity sensing material which does not produce dust can be manufactured, by hermetically sealing the whole of a humidity indicator, wherein a humidity-sensitive coloration substance discolored by humidity is printed on or infiltrated in moisture absorbing paper and a silica gel, with a packaging material having no perforation or slit and having moisture permeability and transparency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a humidity management detection material in food, electronic, medical, and precision instruments that are extremely unaffected by paper dust and dust.

  Conventionally, humidity detection materials that can check the humidity status by color change, as disclosed in Japanese Laid-Open Patent Publication No. 01-153941, have been widely commercialized with cobalt chloride as the main raw material printed or impregnated on the hygroscopic material. Has been. (For example, refer to Patent Document 1). The general principle of these humidity detection materials is to visually recognize the humidity difference between the moisture absorption of cobalt chloride and the color at the time of drying. The relative humidity can be controlled by controlling the concentration of cobalt chloride. The color is adjusted so that the color changes from blue to pink at a relative humidity of 10%, 20%, 30%, or the like. The method of use is used to determine whether or not the relative humidity in the container is as specified by putting a desiccant and humidity detection material in the moisture-proof packaging container. Hygroscopic material, silica gel, is used as the hygroscopic material, which is another material for the humidity detection material.

Japanese Patent Laid-Open No. 01-153941

  The hygroscopic material used for the above-described humidity detecting material generates paper powder and dust, and therefore has limitations in use in the food, electronic, medical and precision equipment fields. In addition, humidity detection materials that use cobalt chloride as the main raw material are designated as first-class chemical substances by the PRTR method (Chemical Substance Management Promotion Act), and they want to be in direct contact with medical products from the viewpoint of impact on the human body. Absent. Furthermore, cobalt chloride has been pointed out to corrode electronic parts and precision equipment.

As a result of intensive studies to solve the above problems, the present inventor has determined that the humidity indicator is sealed with a packaging material that does not have a hole for perforation or cut and has both moisture permeability and transparency. I will provide a. More specifically, as a packaging material having both moisture permeability and transparency without perforation or notching, cellophane, polyvinyl alcohol, polyester-based thermoplastic elastomer film having moisture permeability in the range of 200 to 6000 g / m ² · 24 h Is bonded to a single body or a perforated film, and the humidity indicator is sealed in a bag shape or wrapped.

  As described above, in the present invention, a conventional humidity indicator is sealed with a packaging material having moisture permeability and transparency, so that a humidity detection material having the same performance as a conventional humidity detection material and having no dust generation is obtained. Since it can be obtained and is extremely hygienic and clean, it can be used to obtain a humidity management detection material in food, electronic, medical, and precision instruments that are extremely unaffected by paper dust and dust.

  Hereinafter, embodiments of the present invention will be described in Examples 1 to 4.

FIG. 1 is a plan view of a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a portion A in FIG. The humidity indicator is printed on a 300 g / m ² absorbent paper with a cobalt chloride solution adjusted to change its color at a relative humidity of 10%, 20%, 30%, 40%, 50%, 60% at a predetermined position. Cellophane having a humidity of 4000 g / m ² · 24 h and perforated polyethylene were thermocompression bonded and sealed in a four-side sealed bag to obtain a humidity detection material.

FIG. 3 is a plan view of the second embodiment of the present invention, and FIG. 4 is a cross-sectional view of part B of FIG. The packaging material was the same as in Example 1 except that a cellophane with a moisture permeability of 4000 g / m ² · 24 h was partially coated with a heat-sealable adhesive to form a four-side sealed bag.

FIG. 5 is a plan view of a third embodiment of the present invention, and FIG. 6 is a cross-sectional view of a portion C in FIG. The humidity indicator is impregnated with 300 g / m ² of moisture-absorbing paper with a cobalt chloride solution adjusted to change its color at a relative humidity of 10%, 20%, 30%, 40%, 50%, 60%, and cut into a square. It was arranged in a line on the sheet, and the polyester sheet was heat-sealed with a polyester thermoplastic elastomer film to obtain a humidity detection material.

FIG. 7 is a plan view of the fourth embodiment of the present invention, and FIG. 8 is a cross-sectional view of a portion D in FIG. The humidity indicator impregnated silica gel having an average pore diameter of 60 mm with a cobalt chloride solution adjusted to change color at a relative humidity of 10%, 20%, 30%, 40%, 50%, 60%, and a moisture permeability of 4000 g / m ^2. -It was wrapped in a predetermined position with a packaging material obtained by thermocompression bonding of cellophane and perforated polyethylene for 24 hours to obtain a humidity detection material.

It is a top view which shows the Example of this invention. It is the AA expanded sectional view of FIG. 1, Comprising: It is sectional drawing shown typically. It is a top view which shows the other Example of this invention. FIG. 4 is an enlarged cross-sectional view taken along the line BB in FIG. 3, schematically showing the cross-sectional view. It is a top view which shows other Example of this invention. FIG. 6 is an enlarged sectional view taken along the line CC of FIG. 5, schematically showing the sectional view. It is a top view which shows other Example of this invention. FIG. 8 is an enlarged cross-sectional view taken along the line DD of FIG. 7, schematically showing the cross-sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cellophane film 2 Perforated polyethylene film 3 Hole 4 Hygroscopic paper 5 Adhesive part 6 Adhesive 7 Polyester sheet 8 Cobalt chloride impregnated silica gel 9 Polyester thermoplastic elastomer film 10 Cobalt chloride printing part 11 Cobalt chloride impregnated hygroscopic paper

Claims (3)

A humidity detection material in which a humidity indicator is sealed with a packaging material having moisture permeability and transparency without perforations or notches. The humidity detecting material according to claim 1, wherein the packaging material uses a transparent film having a moisture permeability of 200 to 6000 g / m ² · 24 h and capable of visually observing a change of a humidity indicator from the outside. The humidity detection material according to claim 1, wherein the humidity indicator is formed by printing or impregnating a hygroscopic material with a moisture-sensitive colored material that changes color due to moisture absorption.

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