Surface coating layer formation method and gasket manufacturing method

A surface coating layer formation method by which a surface coating layer for improving slidability is formed on a surface of a gasket that is disposed at a tip portion of a plunger used in a syringe and that slides against an inner barrel wall of the syringe, a material of the surface coating layer having a composition in which silicon-based rubber particles are contained in a silicon-based solution, the method comprising:

• an application step of applying the material to the surface of the gasket so as to have a predetermined coating thickness;
• a drying step of drying the gasket after the application at a first temperature for a first time period;
• a baking step of baking the gasket after the drying at a second temperature for a second time period;
• and
• a cleaning step of extraction-cleaning the gasket after the baking at a third temperature for a third time period.

A gasket manufacturing method by which a gasket that is disposed at a tip portion of a plunger used in a syringe and that slides against an inner barrel wall of the syringe, the gasket including a surface coating layer for improving slidability on a surface of a rubber base material, a material of the surface coating layer having a composition in which silicon-based rubber particles are contained in a silicon-based solution, the method comprising:

• an application step of applying the material to a surface of the base material so as to have a predetermined coating thickness;
• a drying step of drying the gasket after the application at a first temperature for a first time period;
• a baking step of baking the gasket after the drying at a second temperature for a second time period;
• and
• a cleaning step of extraction-cleaning the gasket after the baking at a third temperature for a third time period.