| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dehydrated sponge without requiring a net, having good dehydrating performance and free from clogging in sponge itself when pressing laver in dehydrating step in production of laver by constituting a sponge of open cell structure having partition wall, and limiting pore diameter having the above structure and the hardness within specific ranges. SOLUTION: This dehydrated sponge is constituted of an open cell structure having a partition wall and the pore diameter of the above structure is specified to 100-400 μm, preferably 150-300 μm and the hardness defined by 50% compressive load value is specified to 130-450 gw/cm2. The material of the sponge is preferably a rubber such as natural rubber. An antimicrobial agent is preferably formulated into the sponge. The sponge is obtained by keeping, e.g. a raw material resin (preferably having 45-70% resin solid content) in a disperse state, mixing the raw material resin with gas in the presence of a surfactant to form foam and solidifying the foam. At this time, it is preferable that a time required from mixing of gas to solidification is kept to 1-7 min and expansion ratio is kept to 9-4.5 times. |
