| 摘要 |
A method for manufacturing a rubber sponge for a stamp is provided to promote flow of liquid by making the upper portion of the sponge denser and the lower portion of the sponge less dense. A method for manufacturing a rubber sponge for a stamp includes the steps of: mixing NBR(Acrylonitrile Butadience) with rough soluble powders at the rate of 5:1 through a mixer, and making a 6mm thick model disk(11); grinding soluble powders with a grinder to make the powders fine; mixing NBR with fine soluble powders at the rate of 4:1, and making a 1 or 2mm thick model disk(12); attaching the thin model disk on the thick model disk.
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