Ink composition for sensing carbon dioxide gas, carbon dioxide indicator using the same, package provided with the carbon dioxide indicator, and method for sensing pinhole using the same
a carbon dioxide gas and indicator technology, applied in the direction of analysis using chemical indicators, packaging goods types, transportation and packaging, etc., can solve the problems of no means of finding pinholes, poor seal, and inability to check whether the contents are reliably stored in the ambient gas exchange packaging environment, so as to facilitate the checking of changes in the carbon dioxide atmosphere
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example 1
[0141]An ink composition was obtained by finely dispersing ink composition 1, having the following composition, for sensing carbon dioxide gas by using a paint conditioner or the like.
Ink Composition 1 for Sensing Carbon Dioxide Gas
[0142]
Metacresol purple0.1gSodium carbonate1.5gPolyvinylacetal resin17.5gFine-crystal cellulose11gWater70g
[0143]As a support, JIS standard P 3801 chemical analytical filter paper weighing 140 g / m2 was used. This filter paper was coated with ink composition 1 by screen printing, and the resultant structure was dried at 70° C. for 1 hr to obtain an indicator.
[0144]Bags having an internal volume of 50 ml were formed using a gas barrier laminated film composed of a vinylidene chloride-coated nylon film (thickness 25 μm) / low-density polyethylene film (thickness 50 μm). The above-mentioned indicator and a gas mixture of nitrogen gas and carbon dioxide gas were sealed while the concentration of the carbon dioxide gas was variously changed, and their color change...
example 2
[0145]Test packages were formed following the same procedure as in Example 1 except that ink composition 1 for sensing carbon dioxide gas in Example 1 was changed to ink composition 2 for sensing carbon dioxide gas and a 12-μm thick polyester film was used as a support, and their color changes were observed. The obtained results are shown in Table 3 below.
Ink Composition 2 for Sensing Carbon Dioxide Gas
[0146]
Metacresol purple0.1gSodium hydroxide1.0gPolyvinylacetal resin17.5gFine-crystal cellulose11gWater70g
example 3
[0147]Test packages were formed following the same procedure as in Example 1 except that ink composition 1 for sensing carbon dioxide gas in Example 1 was changed to ink composition 3 for sensing carbon dioxide gas, and their color changes were observed. The obtained results are shown in Table 3 below.
Ink Composition 3 for Sensing Carbon Dioxide Gas
[0148]
Metacresol purple0.1gSodium carbonate1.5gPolyvinylacetal resin17.5gWater78.8g
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