| 摘要 |
<p>PURPOSE:To obtain a freshness-keeping sheet material effective in removing metabolic gas generated from green vegetables, etc., and keeping the humidity of the atmosphere within a prescribed range by adding a freshness-keeping agent capable of adsorbing and/or decomposing the metabolic gas in combination with a water-absorbing polymer and a moisture-controlling agent to a water- permeable sheet. CONSTITUTION:The freshness-keeping agent to remove the above metabolic gas such as ethylene and aldehyde by decomposition or adsorption is a commercially available agent produced e.g. by supporting iodic acid or potassium bromate on activated carbon. The freshness keeping agent 1 and a water-absorbing polymer 2 are sandwiched between a pair of water-permeable sheets 4 impregnated with a moisture-controlling agent 3 as shown in the figure to obtain the objective freshness keeping sheet material. The moisturecontrolling agent is e.g. a polyhydric alcohol such as EC and the water-absorbing polymer is a material produced by graftpolymerizing a polymerizable monomer such as (meth)acrylic acid to a polysaccharide such as starch. The water-absorbing sheet is a water-permeable sheet (e.g. paper, pulp or nonwoven cloth) capable of impregnating and supporting a liquid moisture controlling agent.</p> |
