JPH0353928B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and apparatus for forming an opening in a vacuum double bottle in the process of manufacturing the vacuum double bottle to be used as the inner bottle of a magic bottle. In particular, it relates to the sealing of the mouth when manufacturing vacuum double bottles by the body-jointing method.

Conventionally, when manufacturing vacuum double bottles using the body joint method, the outer bottle is cut into rounds at the body, the inner bottle is placed in the lower half of the outer bottle, and the outer bottle is placed on top of the inner bottle. The upper half was put on, the cut part of the body was welded, and the openings of the outer and inner bottles were sealed to form a double bottle.

Therefore, when sealing the openings between the inner bottle and the outer bottle, the opening of the inner bottle is expanded outward in advance to form a flare, and after being combined with the outer bottle, the flare is sealed. The outer periphery and the upper end of the opening of the outer bottle were sealed by welding.

However, in this method, if the width of the flare is too large, the flare cannot pass through the opening of the outer bottle, and the inner bottle cannot be accommodated in the outer bottle. Furthermore, if the width of the flare is too small, a gap will be created between the outer periphery of the flare and the upper end of the opening of the outer bottle, making it impossible to seal well. Furthermore, if the width of the flare varies, the inner bottle becomes eccentric within the outer bottle, making it impossible to maintain a constant distance between the outer bottle and the inner bottle.

The present invention was made in consideration of such circumstances,
After storing the inner bottle inside the outer bottle, weld it to the top of the outer bottle while forming a flare at the top of the inner bottle.
The object is to solve the above-mentioned problems at the time of sealing all at once.

Therefore, the invention of the method of the present invention is to store an inner bottle in an outer bottle of a double bottle, make the upper end of the opening of the inner bottle protrude from an opening of the outer bottle, and while rotating both the bottles, heating the protruding portion of the opening of the inner bottle, supporting the opening of the inner bottle from the inside to one side, and expanding the protruding portion outward at the opposite position to form a flare; death,
The flare is welded to the opening of the outer bottle.

The invention of the device also includes an outer bottle support member that supports the opening of the outer bottle from the outside; an inner bottle support member that supports the inner bottle; a heating means that heats the upper end of the opening of the inner bottle; consisting of an expanding member that expands in the direction,
The outer bottle supporting member supports the outer bottle, the inner bottle supporting member supports the inner bottle on one side, and the expanding member expands the upper end of the inner bottle in the opposite direction. be.

The present invention will be explained below with reference to the drawings. In the drawing, 1 is an inner bottle, 2 is an outer bottle,
The inner bottle 1 and outer bottle 2 form a vacuum double bottle. Thus, the inner bottle 1 is housed within the outer bottle 2, and the upper opening 3 of the inner bottle 1 is further projected upward from the upper opening 4 of the outer bottle 2.

A plurality of outer bottle supporting members 5 (three is suitable) are arranged along the outer periphery of the upper opening 4 of the outer bottle 2, and are rotatably provided. 6 is an inner bottle supporting member, and the inner bottle 1
It is inserted into the upper opening 3 of and is rotatably provided at a position in contact with one side wall (inner left wall in the figure).

7 is an expansion member. The expanding member 7 has a substantially conical head, and is rotatably provided around the tip of the head.

Therefore, in order to seal the upper openings 3 and 4 of the inner bottle 1 and the outer bottle 2, the inner bottle 1 is first housed in the outer bottle 2, and the upper end of the upper opening 3 of the inner bottle 1 is sealed. is made to protrude upward from the upper end of the upper opening 4 of the outer bottle 2, and the body of the outer bottle 2 is welded. Then, the outer bottle support member 5 is arranged around the outer circumference of the upper opening 4 of the outer bottle 2, and the inner bottle support member 6 is inserted into the upper opening 3 of the inner bottle 1.

In this state, the inner bottle 1 and the outer bottle 2 are integrally rotated about their central axis.
Thereby, the misalignment of the center axes of the inner bottle 1 and the outer bottle 2 is corrected by the outer bottle support member 5 and the inner bottle support member 6, and the center axes of the inner bottle 1 and the outer bottle 2 are aligned.

Then, while rotating both bottles, the upper end of the inner bottle 1 protruding from the outer bottle 2 is heated by a heating means 9 such as a gas burner to soften it. Next, the softened portion is pressed outward by the expansion member 7 at a position opposite to the position supported from the inside by the inner bottle support member 6 and expanded to form the flare 8.

Further, the outer circumference of the flare 8 and the outer bottle 2
The upper end of the upper opening 4 is heated to weld the flare 8 and the outer bottle 2 and seal them. After that,
A mold is applied to this sealed portion, and air is blown from a tip tube (not shown) provided at the bottom of the outer bottle 2 to form a mouth portion.

According to the present invention, since no flare is formed in advance at the upper end of the upper opening 3 of the inner bottle 1, when the inner bottle 1 is stored in the outer bottle 2, the flare is too large and the outer bottle 2 There is no possibility that the bottle cannot pass through the upper opening 4 of the outer bottle 2, or that the flare is so small that the upper end of the outer bottle 2 cannot be sufficiently sealed. Further, the center axes of the inner bottle 1 and the outer bottle 2 do not shift due to variations in the width of the flare.

In addition, since the inner bottle 1 is only housed within the outer bottle 2 and its position is not fixedly regulated, the flare 8 is simply formed in the upper opening 3 of the inner bottle 1. If an attempt is made to seal the upper end of the upper opening 4 of the outer bottle 2, the inner bottle 1 may move within the outer bottle 2, and the central axes of the inner bottle 1 and the outer bottle 2 may become misaligned. For example, the upper opening 4 of the outer bottle 2 is regulated in position by the outer bottle support member 5, and the upper opening 3 of the inner bottle 1 is regulated in one direction (left side in the figure) by the inner bottle support member 6. As the flare 8 is expanded by the expansion member 7 in the opposite direction (to the right in the figure), the upper opening of the inner bottle 1 is expanded by the inner bottle support member 6 and the expansion member 7. 3 is naturally regulated, and the distance between the inner bottle 1 and the outer bottle 2 can be set uniformly.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing the state of implementation of the present invention. 1... Inner bottle, 2... Outer bottle, 3... Upper opening, 4... Upper opening, 5... Outer bottle support member,
6... Inner bottle support member, 7... Expansion member, 8...
Flare, 9...Heating means.

Claims (1)

[Claims] 1. An inner bottle is housed in an outer bottle of a double bottle, the upper end of the opening of the inner bottle is made to protrude from an opening of the outer bottle, and the inner bottle is opened while rotating both bottles. heating the protruding part of the inner bottle, supporting the opening of the inner bottle from the inside to one side, and expanding the protruding part outward at the opposite position to form a flare; A method for sealing a double-breasted bottle, the method comprising: welding the cap to the opening of the outer bottle. 2. An outer bottle support member that supports the opening of the outer bottle from the outside, and an inner bottle that is inserted into the opening of the inner bottle housed in the outer bottle and supports the opening of the inner bottle from the inside to one side. a support member, a heating means for heating the upper end of the opening of the inner bottle, and expanding the upper end of the opening of the inner bottle outward on the opposite side of the inner bottle portion supported by the inner bottle support member; A double bottle mouth sealing device comprising an expanding member.