Patent ID: 8784883

Claim:
A method for preparing a hard capsule comprising low-substituted cellulose ether, the method comprising: a step of covering a pin for forming the hard capsule with the low-substituted cellulose ether by immersing the pin in an alkaline solution of the low-substituted cellulose ether; a step of forming the low-substituted cellulose on a surface of the pin into a gel by further immersing the covered pin in an aqueous acid solution; a step of washing by immersing in water the pin whose surface has been covered with the gel; and a step of drying; wherein the low-substituted cellulose ether is insoluble in water, but swells by absorbing water, and is soluble in an aqueous alkaline solution; and wherein the low-substituted cellulose ether has a substitution degree of 0.1-0.8.