METHOD OF MANUFACTURING GLASS CONTAINER

• US 20190218129A1
• Filed: 02/13/2017
• Published: 07/18/2019
• Est. Priority Date: 12/28/2016
• Status: Active Grant

• Current Assignee: Koa Glass Co., Ltd.
• Original Assignee: Koa Glass Co., Ltd.
• Inventors: SASAKI, Yuya, ARAI, Kenjirou
• Granted Patent: US 10,640,409 B2
• Time in Patent Office: Days
• CPC Class Codes: B65D 1/0261 Bottom construction B65D1/06 takes precedence
• CPC Class Codes: B65D 1/40 Details of walls other container details B65D23/00, B65D25/00
• CPC Class Codes: B65D 85/48 for glass sheets
• CPC Class Codes: C03B 9/14 in "blow" machines or in "blow-and-blow" machines C03B9/193, C03B9/20 take precedence
• CPC Class Codes: C03B 9/145 Details of machines without turn-over moulds
• CPC Class Codes: C03B 9/165 Details of such machines, e.g. guide funnels, turn-over mechanisms C03B9/18 takes precedence
• CPC Class Codes: C03B 9/31 Blowing laminated glass articles or glass with enclosures, e.g. wires, bubbles
• CPC Class Codes: C03B 9/335 Forming bottoms to blown hollow glass articles; Bottom moulds

Abstract

There is provided a method of manufacturing a glass container that can manufacture a glass container, which includes a bubble formed in a bottom portion and independent of the outside, with high yield by accurately controlling the position and size of the bubble.

A method of manufacturing a glass container that includes a mouth portion, a body portion, and a bottom portion, includes: a step of molding a glass container, in which a bubble is not yet formed, from molten glass; a step of forming a bubble-forming passage by pulling out a needle-like member after inserting the needle-like member into a bottom portion of the glass container in which a bubble is not yet formed; a step of injecting air from an inlet of the bubble-forming passage to form a reverse teardrop-shaped internal space, which is widened in the bottom portion from the bubble-forming passage as a starting point, in the bottom portion of the glass container in which a bubble is not yet formed, and to obtain a glass container that includes an internal space communicating with the outside; and a step of closing an inlet side of the reverse teardrop-shaped internal space by flow of not yet cured glass, which is caused by the potential heat of the not yet cured glass, to obtain a glass container that includes a bubble formed in the bottom portion and independent of the outside.

Claims

1. A method of manufacturing a glass container that includes a mouth portion, a body portion, and a bottom portion, the method comprising:

a step (A) of molding a glass container, in which a bubble is not yet formed, from molten glass;

a step (B) of forming a bubble-forming passage by pulling out a needle-like member after inserting the needle-like member into a bottom portion of the glass container, in which a bubble is not yet formed, from a bottom face;

a step (C) of injecting air from an inlet of the bubble-forming passage to form a reverse teardrop-shaped internal space, which is widened in the bottom portion from the bubble-forming passage as a starting point, in the bottom portion of the glass container in which a bubble is not yet formed, and to obtain a glass container that includes an internal space formed in the bottom portion and communicating with the outside; and

a step (D) of closing an inlet side of the reverse teardrop-shaped internal space of the glass container, which includes the internal space formed in the bottom portion and communicating with the outside, by flow of not yet cured glass, which is caused by the potential heat of the not yet cured glass, to obtain a glass container that includes a bubble formed in the bottom portion and independent of the outside.

2. The method of manufacturing a glass container according to claim 1,

wherein in the step (B), a time, which is to elapse until the needle-like member starts to be inserted, is set to a value within the range of 0.01 to 0.5 sec immediately after the completion of the step (A) and a time, which is to elapse until the needle-like member starts to be pulled out, is set to a value within the range of 0.05 to 0.5 sec immediately after the completion of the insertion of the needle-like member.

3. The method of manufacturing a glass container according to claim 1,

wherein in the step (B), the depth of the bubble-forming passage from the bottom face, which is obtained immediately after the needle-like member is pulled out, is set to a value within the range of 20 to 80% of the thickness of the bottom portion in a longitudinal direction.

4. The method of manufacturing a glass container according to claim 1,

wherein in the step (B), the maximum diameter of the bubble-forming passage, which is formed immediately after the needle-like member is pulled out, is set to a value within the range of 0.5 to 5 mm.

5. The method of manufacturing a glass container according to claim 1,

wherein in the step (B), the shape of the cross-section of the bubble-forming passage, which is formed immediately after the needle-like member is pulled out, taken along a plane orthogonal to an axis of the bubble-forming passage is at least one selected from the group consisting of a circular shape, an oval shape, and a polygonal shape.

6. The method of manufacturing a glass container according to claim 1,

wherein in the step (B), an insertion direction of the needle-like member is set to correspond to an upper side in a vertical direction.

7. The method of manufacturing a glass container according to claim 1,

wherein the thickness of the bottom portion in the longitudinal direction is set to a value within the range of 20 to 100 mm, and the maximum diameter of the bottom portion is set to a value within the range of 30 to 80 mm.

8. The method of manufacturing a glass container according to claim 1,

wherein in the step (C), the pressure of the air is set to a value within the range of 0.05 to 0.5 MPa and a total volume of air to be used is set to a value within the range of 1 to 100 ml.

9. The method of manufacturing a glass container according to claim 1,

wherein the maximum diameter of the bubble independent of the outside is set to a value within the range of 2 to 30 mm.