Method for producing syringe gasket, and syringe including the gasket
AssigneeSumitomo Rubber Industries, Ltd.
InventorYuki Sakashita
Life of this patent
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Abstract
The present invention provides a method for producing a syringe gasket which is improved in liquid drug sealability by forming a minute projection on a circumferential surface of the gasket after demolding the gasket. In a method for producing a syringe gasket including a cylindrical main body (2) made of an elastic material and an inert resin film (3) laminated on a surface of the main body (2), at least one minute projection (5) is formed as extending circumferentially of the gasket on a surface of the inert resin film (3) laminated on the main body (2) by thermal processing using a laser beam.
Claims11
A syringe gasket production method comprising the steps of:
- preparing a syringe gasket including a cylindrical main body made of an elastic material and an inert resin film laminated on a surface of the main body;
- and
- forming at least one minute projection extending circumferentially of the gasket on a surface of the inert resin film laminated on the main body by thermal processing using a laser beam,
- wherein an inner surface of the inert resin film to be brought into contact with the surface of the main body is subjected to a surface texture modifying process before the inert resin film is laminated on the surface of the main body.
A syringe gasket production method comprising the steps of:
- preparing a syringe gasket including a cylindrical main body made of an elastic material and an inert resin film laminated on a surface of the main body;
- and
- forming at least one groove extending circumferentially of the gasket on a surface of the inert resin film laminated on the main body by thermal processing using a laser beam,
- wherein the groove has a width of 135 μm to 180 μm and has minute projections at both edges of the groove which are formed by redepositing a part of evaporated materials while the groove is formed using a laser beam.
Dependencies are inferred from the claim text.