JPH0532502Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a glass bottle plunger device for forming a glass bottle preform (hereinafter referred to as a parison) into a hollow shape. Regarding.

[Conventional technology]

Among the means of forming the parison of glass bottles,
A method called a press blow method is known. Among these methods, the pressing stage is a rough finishing stage in which a plunger body having a hollow part is inserted into the opening of the mold, and molten glass (hereinafter referred to as
After that, pressure is applied to the rear end of the plunger body to push the tip toward the inside of the molten glass, thereby forming the parison into a hollow shape. The gob is at a high temperature of approximately 1100°C or more, and cooling air is blown into the hollow part of the plunger body that comes into contact with the gob to cool the plunger body.

[Problem that the invention attempts to solve]

However, in the case of a plunger configured to blow cooling air into the hollow part to cool the outer circumferential wall of the plunger body, it is extremely difficult to make the temperature of the outer circumferential wall uniform; A problem arises in that the finished glass bottle has uneven wall thickness.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plunger device for molding glass bottles that solves the problems of the conventional techniques described above and can uniformly cool the outer circumferential wall of the plunger body.

[Means for solving problems]

In order to achieve the above object, the present invention is inserted into the mold opening for preforming the molten glass in the mold into a hollow shape, and has a hollow part,
In the plunger device that is capable of feeding cooling air into the hollow part, a tube with an open tip and a plurality of through holes spaced at predetermined intervals along the length of the tube outer peripheral wall is inserted into the hollow part. At the same time, fins consisting of a plurality of arc-shaped grooves extending in the longitudinal direction from the rear end to the tip and continuously formed in the circumferential direction are provided on the inner circumferential wall of the plunger body forming the hollow part. It is characterized by the fact that it has been provided.

[Effect]

According to the present invention, fins consisting of a plurality of arcuate grooves extending longitudinally from the rear end to the tip are continuously provided in the inner peripheral wall of the plunger body in the circumferential direction. Since the cooling area of the peripheral wall is greatly increased and cooling air is evenly blown through the tube holes, the plunger body is efficiently cooled and the plunger body can be cooled uniformly.

〔Example〕

Hereinafter, an embodiment of a plunger device for molding glass bottles according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a plunger body having a hollow portion 2, and this plunger body 1 is inserted into an opening 5 of a mold 3. A gob 6 having a temperature of about 1100° C. is poured into the mold 3. Inside the hollow part 2, there is a tube 8 having a through hole 7 opening at the tip and a plurality of through holes 7, 7, 7...7 formed at predetermined intervals along the length direction on the outer peripheral wall. Once inserted, this tube 8 is fixed to the plunger body 1 by means of a flange 9. When molding a parison, the gob 6 is poured into the mold 3, and then pressure is applied to the rear end 1a of the plunger body 1 by an actuator (not shown), and the tip 1b of the plunger body 1 is pressed.
Push up toward the inside of gob 6. Push up normally 5 to 7 times per minute, at intervals of 2 to 3 seconds each time. During this time, cooling air is supplied into the tube 8 from the direction shown by the arrow, and this air is supplied to the through hole 7.
The plunger body 1 is cooled by being blown out through the plunger body 1.

According to the present invention, the plurality of fins 1 extending in the longitudinal direction on the inner circumferential wall of the plunger body 1
0 is formed. As shown in FIG. 2, this fin 10 is constructed by continuously forming an arc-shaped groove 10a with a depth of about 1 mm in the inner peripheral wall of the plunger body 1 in the circumferential direction. 10a is converged toward the center at the tip, as shown in FIG. Here, the fins 10 can also be molded integrally with the plunger body 1 by casting. Note that it is clear that the shape of the fins 10 is not limited to an arcuate groove.

By providing the fins 10 on the inner peripheral wall of the plunger body 1, the cooling area is increased. for example,
When the depth of the fins 10 is 1 mm, the cooling area of the inner peripheral wall of the plunger body 1 increases by as much as 10 to 15%. Therefore, efficient cooling is possible with a small flow rate of cooling air, and the passage hole 7 of the tube 8 is
Since the cooling air is blown uniformly over the entire length of the plunger body 1, it is possible to prevent temperature unevenness from occurring on the outer peripheral wall, thereby preventing uneven wall thickness from occurring on the finished glass bottle. can do.

[Effect of idea]

As is clear from the above description, according to the present invention, fins consisting of a plurality of arcuate grooves extending longitudinally from the rear end to the tip are continuous in the circumferential direction on the inner circumferential wall of the plunger body. Since the cooling area is increased and the cooling air is evenly blown through the tube's holes, it is possible to prevent temperature unevenness on the outer peripheral wall of the plunger body. can be prevented from occurring.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a plunger device for molding glass bottles according to the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is a cross-sectional view taken along the - line in FIG. It is a cross-sectional view taken along a line. 1...Plunger body, 2...Hollow part, 3...
...mold, 5... opening, 6... molten glass (gob), 8... tube, 10... fin.

Claims (1)

[Scope of utility model registration request] In a plunger device which is inserted into a mold opening in order to preform molten glass in a mold into a hollow shape and has a hollow part and is capable of feeding cooling air into the hollow part, the hollow part A tube with an open tip and a plurality of through holes spaced at predetermined intervals along the length of the tube is inserted into the outer peripheral wall of the tube, and a rear end portion is inserted into the inner peripheral wall of the plunger body forming the hollow portion. 1. A plunger device for forming a glass bottle, characterized in that it is provided with fins consisting of a plurality of arcuate grooves extending longitudinally from the tip to the tip and continuously formed in the circumferential direction.