JPS5854094B2 - How to mold glass containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a glass container in which the upper surface of the opening is molded into a smooth surface with high precision.

For example, when forming the top surface of the opening of a container into a smooth surface, such as in the case of a sliding type airtight container body, conventionally,
It was common practice to grind the top surface of the opening of the container into a smooth plane using a grinder.

However, this conventional method requires a step of polishing after grinding and a step of rinsing and drying, resulting in high cost.

The method for molding a glass container according to the present invention eliminates the drawbacks of the conventional method described above and simplifies the molding process as much as possible. The annular protruding portion is heated and melted, and in this melted portion,
It is characterized in that the smooth portion of the smooth plate is pressed and the pressure inside the glass container is reduced.

Hereinafter, one embodiment of the method for molding a glass container according to the present invention will be described based on the drawings.

In FIG. 1, the upper surface of the opening of a circular glass container 1 which has been press-molded in advance is provided with a step as shown in FIG. 2, and an annular protrusion 1a having a triangular cross section is formed on the step.

The pedestal 2 is a circular plate having a recessed portion in the center of the upper surface into which the glass container 1 is inserted and fixed, and is rotated as a whole around an axis 2a.

A plurality of burners 3 are arranged at equiangular positions on the periphery C of the pedestal 2 and heat the annular protrusion 1a portion of the glass container 1.

The smooth plate 4 is a circular plate of approximately the same size as the pedestal 2, and is provided with a recess 6 at the center of its lower surface, and is provided with an annular pressing portion 4a consisting of an annular smooth portion around the recess. A vacuum suction pipe 4b connected to a vacuum pump (not shown) via a vacuum suction pipe 4c is connected to the smooth plate 4 from above.
An opening is provided hanging down through the interior.

Further, the smooth plate 4 is driven to move up and down, and the distance between the smooth plate 4 and the pedestal 2 when the smooth plate 4 is lowered is at an equiangular position on the peripheral edge of the smooth plate 4 and the pedestal 2. It is limited by a plurality of pairs of stoppers 4d and 2b provided at.

When forming the upper surface of the opening of the glass container 1 into a smooth surface, first, the glass container 1 is fixed on the pedestal 2, and while the pedestal 2 is rotated, the burner 3 is used to form the glass container 1 into a smooth surface.
The annular protrusion 1a portion is locally heated and melted.

At this time, as shown in FIG. 3, the annular protrusion 1a has a substantially semicircular cross section due to the surface tension of the molten glass.

Next, the heating by the burner 3 is stopped, the rotation of the pedestal 2 is stopped, and while the vacuum pump is operating, the smooth plate 4 is lowered until the stopper 4d contacts the stopper 2b, as shown in FIG. Then, the annular pressing portion 4a of the smooth plate 4 is pressed against the annular protrusion 1a in a molten state.

Then, the tip of the annular protrusion 1a is crushed by the annular suppressing part 4a to form a smooth surface 1b that is in close contact with the lower surface of the annular pressing part 4a, and the inside of the glass container 1 is further reduced in pressure by the operation of the vacuum pump. Therefore, smooth surface 1
b is smoothed with even higher precision.

In other words, the precision of the smooth surface 1b is improved to the point where it is almost equal to the polished state of the annular pressing portion 4a.

In this state, the annular protrusion 1a is rapidly cooled and solidified by the annular pressing portion 4a.

After that, even if the operation of the vacuum pump is stopped, the glass container 1 remains in close contact with the smooth plate 4, so by lifting the smooth plate 4, the glass container 1 is removed from the pedestal 2, and then the vacuum pump is reversed. When air is blown into the glass container 1, the glass container 1 separates from the smooth plate 4 and falls, so it is received by a conveyor (not shown) and transferred to a slow cooling furnace (
(not shown).

Note that the present invention is not limited to the above embodiments,
The shape of the cross section of the annular protrusion 1a may be changed to a shape other than a triangle, or the smooth plate 4 may be lowered while the pedestal 2 and the smooth plate 4 are rotated concentrically and relative to each other. can.

In addition, although the above embodiments have been shown for circular glass containers, the method of the present invention can also be used for glass containers other than circular, such as square ones. In this case, the glass container is rotated and the glass container is By heating the annular protruding portion while moving the burner close to or away from the container using a cam or the like having the same shape as the shape of the container, it is possible to eliminate unbalanced heating.

The method for forming a glass container according to the present invention consists of the above-mentioned method, in which the annular protrusion on the top surface of the opening of the glass container is brought into a furnace shaft state, and the smooth part of the smooth plate is pressed against it, while the pressure inside the container is reduced. Since it forms a smooth surface, it not only provides a highly smooth container opening, but also
Compared to conventional grinding, the process is simpler and takes less time, and the formed smooth surface does not need to be polished or washed with water, which helps save labor, improves mass production, and lowers costs. This is extremely useful when manufacturing the main body of a sealed container.

[Brief explanation of drawings]

The figures show an example of the method for forming a glass container according to the present invention. Fig. 1 is a cross-sectional view of the entire structure during forming. Figs. FIG. 1...Glass container 1.1a...Annular protrusion, 1b...Smooth surface, 2...Case, 3
...Burner 4...Smooth plate, 4a.
...Annular pressing part, 4b, 4c...Vacuum pipe.

Claims (1)

[Claims] 1. In a method for forming a glass container in which the peripheral edge of the opening is formed into a smooth surface, the annular protruding part of the glass container having the annular protruding part provided on the upper surface of the opening is heated and melted, and a smooth plate of a smooth plate is applied to the melted part. A method for molding a glass container, which comprises pressing a portion and reducing the pressure inside the glass container.