Method of manufacturing heat-fixing rubber roller and heat-fixing rubber roller

1. A method of manufacturing a heat-fixing rubber roller, the method comprising:

forming a rubber layer of a silicone rubber composition on an outer periphery of a metal core shaft, the composition containing water-soluble sugar powder and triethylene glycol;

vulcanizing the rubber layer; and

eluting the sugar powder and the triethylene glycol from the vulcanized rubber layer to form a foam rubber layer.

2. The method of manufacturing the heat-fixing rubber roller according to claim 1 , wherein the foam rubber layer has an open cell ratio of 90% or more.

3. The method of manufacturing the heat-fixing rubber roller according to claim 1 , wherein the sugar powder has a particle size of 1 to 1000 μm.

4. The method of manufacturing the heat-fixing rubber roller according to claim 3 , wherein the sugar powder has a particle size of 10 to 400 μm.

5. The method of manufacturing the heat-fixing rubber roller according to claim 1 , wherein the silicone rubber composition contains 100 parts by mass of the silicone rubber, 50 to 200 parts by mass of the sugar powder, and 1 to 50 parts by mass of the triethylene glycol.

6. The method of manufacturing the heat-fixing rubber roller according to claim 1 , wherein the sugar powder is at least one selected from a group consisting of glucose, lactose, sucrose, trehalose, fructose, sugar, granulated sugar, and powdered sugar.

7. The method of manufacturing the heat-fixing rubber roller according to claim 1 , wherein the silicone rubber is addition-reaction liquid silicone rubber.

8. A heat-fixing rubber roller manufactured by the method of manufacturing the heat-fixing rubber roller according to claim 1 .