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US 10,894,735 B2Granted
Vial and method for producing the same
AssigneeNipro Corporation
InventorsHideo Kuwabara, Hideki Yamauchi, Yoshitaka Ishimi, Shinichiro Senga
Life of this patent
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Abstract
A method for producing a vial with low alkali elution by removing a deteriorated region caused by processing on an internal surface of a vial is disclosed. The method involves forming vials from borosilicate glass tubes including a first step of forming a borosilicate glass tube into a cup-shaped body by formation of a bottom of a vial, and a second step of forming the cup-shaped body into the vial by formation of a mouth of the cup-shaped body.
Claims6
A method for producing a vial as a product wherein the method comprises the steps of:
- providing as a preform a container for the vial having a bottom made of a borosilicate glass tube, and
- intensely heating only an inner surface of the container as the preform with oxygen-gas flame such that the flame changes from an early blue flame to a yellow flame with increasing temperature so as to obtain the vial as the product.
Dependencies are inferred from the claim text.