JP2523446B2 - Glass container manufacturing method and manufacturing apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a hollow glass container used as a packaging bottle, a storage container for foods and beverages and the like.

[0002]

2. Description of the Related Art Most hollow glass containers having a threaded mouth are usually manufactured by a molding machine called an IS machine. In this case, two types of molds, a rough mold and a finishing mold, are used in the molding process, and since both are split molds, the seam of each mold remains on the body of the product. This applies to other molding machines that produce similar products. In the case of a cup or the like, since it is manufactured by a method called spin blow molding, there is a feature that even if the finishing mold is a split mold, no seam of the mold remains on the body. In this case, however, the mouth portion is cut and removed after completion of molding, and only the portion excluding the mouth portion becomes the product.

In the mouthpiece mechanism of the conventional blow molding machine H28M shown in FIG. 6, the opening of the mouthpiece 29 divided into four equal parts is hinged around a hinge pin 34 located above the outer periphery of the mouthpiece 29. The upper end 32 of the arm 30 is rotated by the lowering of the cam plate 31, and the mouth die 29 attached to the lower end 33 of the hinge arm 30 opens in a semicircular locus around the hinge pin 34. Therefore, for example, when there is a screw or the like on the outer periphery of the mouth portion, the molded screw interferes with the screw-shaped portion 29a on the inner surface of the mouth die 29 and cannot be released. The tightening force of the mouth die 29 is the coil spring 3 wound around the outer circumference of the mouth die 29 in the shape of a headband.
It is given with a contraction force of 5. The closing operation of the mouth die 29 is closed by the contracting force of the coil spring 35 when the cam plate 31 moves up and the upper end 32 of the hinge arm 30 separates from the cam plate 31.

In this case, the tightening force applied to the mouth die 29 is only the contracting force of the coil spring 35, and the force is not large. Therefore, when a force in the opening direction is applied to the mouth die 29 during the molding of the mouth portion 36, that is, when pressure is applied to the glass, the mouth die 29 opens and many defects described later occur.

[0005]

As described above, a glass container having a threaded mouth portion or a glass container having an uneven pattern at the mouth portion is always formed on the body portion as a linear ridge with a mold joint. However, there was a problem that the design was unsightly. On the other hand, in the blow-blowing molding apparatus, it is possible to mold a product without a mold die in the body portion, but since it is premised on cutting and removing the mouth portion, it is not possible to mold a glass container having a screw or the like in the mouth portion. could not. That is, in the conventional blow-molding apparatus, even if a screw is molded with a mouth mold, the mold cannot be released later, and the mold clamping force of the mouth mold is weak, so that the glass may stick out of the mold or the mold may not be released during molding. This is because the mouth part is scratched by a slight movement and a minute crack on the mold contact surface of the glass due to the impact. INDUSTRIAL APPLICABILITY The present invention, in the blow-molding method, is capable of forming a screw or an uneven pattern on the outer periphery of the mouth portion that has been conventionally cut and removed, so that the trunk portion is excellent in design and has a seamless shape. It is an object of the present invention to enable the manufacture of a glass container.

[0006]

The present invention comprises a step of press-molding a split mouth die which opens and closes in a horizontal direction, and a coarse die which is a parison having a screw or uneven pattern on the outer periphery of the mouth portion.
The parison is blown in the finishing split mold and the mouth mold and the finishing split mold are rotated relatively to each other to form a seamless body portion by spin blow molding, and the finishing split mold is divided and released. A glass container characterized by comprising a step of separating and releasing the mold in the horizontal direction and taking out a molded glass container having a mouth portion having a screw or an uneven pattern on the outer periphery and a seamless body portion. And a blow-molding process for a glass container comprising a mouth mold, a rough mold and a press mechanism for press-molding a parison, and a finishing split mold and a blowing mechanism for finishing the parison into a glass container by blow-molding. In the apparatus, the mouth-blowing manufacturing apparatus for glass containers is characterized in that the mouth-mold is a split mouth-mold that opens and closes horizontally.

As a mechanism for opening and closing the mouth die in the horizontal direction,
For example, as shown in Examples described later, a flange-shaped mouth guide ring is formed on the outer periphery of the lower end of the plunger guide ring, and a peripheral groove that engages with this is formed in the mouth die. It can be realized by applying a known mechanism such as an appropriate guide mechanism that is horizontally guided and opened and closed.

[0008]

In the method for producing a glass container of the present invention, the mouth portion is press-molded by a split mouth die that opens and closes in the horizontal direction, and a screw or an uneven pattern is formed on the outer periphery of the mouth portion. Occasionally, the mouth die moves horizontally, and the formed screw or the like can be released without interfering with the screw-shaped portion on the inner surface of the mouth die. Further, after the mouth portion is press-molded, the glass is rotated by blow-molding to form the body portion, so that the body portion does not have a seam. Therefore, according to the method of the present invention, it is possible to manufacture a glass container having an excellent design which has a mouth portion having a screw or an uneven pattern on the outer periphery and a seamless body portion.

Although the glass container manufacturing apparatus of the present invention is a blow molding apparatus, the opening and closing operation of the mouth mold is made horizontal so that the mouth of the glass container having a screw or an uneven pattern is formed on the outer periphery. It is possible to release the mold without interfering with the appearance of the inner surface of the mold, and it is possible to form a screw or an uneven pattern on the outer circumference of the mouth portion of the glass container. Since the body portion is formed by the blow blow as in the conventional blow blow molding apparatus, it is possible to manufacture a new type of hollow glass container having an excellent appearance with no mold match.

[0010]

EXAMPLE This example is a typical blow molding machine H
A new mouthpiece mechanism is applied to 28M, and a parison having a screw on the outer peripheral surface of the mouth is molded, and then blown and blow molded to manufacture a hollow glass container with no die fitting in the body. Is.

FIG. 1 shows a schematic cross-sectional view of the device of the present invention, and FIG. 2 shows a top view of this mouthpiece mechanism. FIG. 3 shows a top view with the mouth die opened, FIG. 4 shows a cross-sectional view thereof, and FIG. 5 shows a bottom view thereof.

The present embodiment will be described in detail below with reference to the drawings. This mouth-shaped mechanism is the outer circumference 15 of the plunger ring 15.
Groove cam 2 provided on gear 3 rotatably attached to a
The displacement of the cam roller 4, the hinge arm 5 that rotates about the hinge pin 6, and the groove 8 on the upper surface of the divided die 1 to which the end 7 of the hinge arm 5 is engaged.
To open and close. In this embodiment, the mouth die 1 is divided into three equal parts. The displacement of the groove cam 2 is given by rotating the gear 3 by the rack gear 10 driven by the air cylinder 11. The closing of the mouth die 1 is performed by the movement of the piston rod 12 in the outgoing direction as shown in FIG.
Is disengaged from the gear 3 when the piston rod 12 moves to the final end. After that, the gear 3 is rotated by the contracting force of the coil spring 13 until the die 1 is closed. Coil spring 1
One end of 3 is attached to a pin 14 fixed on the gear 3, and the other end is attached to a pin 18 fixed on a gear holding plate 17 fixed to a plunger ring 15 with a key 16. The coil spring 13 is attached in a stretched and urged state, and gives the gear 3 a rotational force in a direction in which the die 1 is closed.

The opening and closing of the mouth die will be described in more detail. From the closed state of FIG. 2, when the cylinder 11 is operated to move the piston rod in the inserting direction (upward direction of FIG. 2), the rack gear 10 moves the gear 3 to the gear 3. Rotate to the left. Then
As shown in FIG. 3, the coil spring 13 is in an expanded state, the cam roller 4 is moved inward in the radial direction by the action of the grooved cam 2 of the gear 3, and the hinge arm 5 is rotated about the hinge pin 6 to move the end portion. 7 moves to the outer side in the radial direction, and as shown in FIG. 4, the die 1 moves horizontally and opens by the die guide ring 9 being guided by the circumferential groove 1a. When closing the mouth die, when the cylinder 11 is operated to move the piston rod in the outgoing direction (downward in FIG. 3) from the open state of FIG. 3, the rack gear 10 rotates the gear 3 to the right, As shown in FIG. 2, the rack gear 10 is disengaged from the gear 3. However, the elastic force of the coil spring 13 causes the gear 3 to rotate further to the right, the cam roller 4 moves outward in the radial direction by the action of the grooved cam 2 of the gear 3, and the hinge arm 5 rotates about the hinge pin 6. Then, the end portion 7 moves inward in the radial direction, and as shown in FIG. 2, the mouth die 1 is horizontally moved and closed by the die guide ring 9 being guided by the circumferential groove 1a. At this time, the elastic force of the coil spring 13 acts so that the die 1 is completely closed.

In the closed state of the die 1, the contact angle α between the cam 2 and the cam roller 4 is sufficiently small so that the tightening force of the die 1 given by the coil spring 13 can be sufficiently strong. Since the contact angle α is small, the mouth die 1 does not open even when a force in the opening direction acts on the mouth die 1 when the mouth portion 36 is molded.

The contact angle α is the tangent line x of the inner surface of the groove cam 2 at the contact point between the inner surface of the groove cam 2 and the cam roller 4,
The angle formed by the tangent line y of the concentric circle at the center of the die, and when this angle is small, when a force in the opening direction is applied to the die 1, that is, when an inward force is applied to the cam roller 4 in FIG. In addition, the rotational force applied to the gear 3 (rotational force in the left direction) is reduced, and the elastic force of the coil spring 13 resists,
The gear 3 never rotates. That is, the mouth mold 1 is not opened. Therefore, it is possible to prevent the defect that the glass protrudes from the mouth mold.

In H28M, a lump of molten glass called a gob is first charged into the rough mold 20 with the mold 1 being closed, and the rough mold 20 is raised to a position where it contacts the lower surface of the mold 1. At the same time, the plunger 21 descends and the parison 22 is formed. At this time, the mouth portion 36 is also formed at the same time. When the molding of the parison 22 is completed, the rough mold 20, the plunger 21
Each descends, rises, and leaves the parison 22,
The state shown in is shown. Here, the entire mouthpiece mechanism is rotated by the pinion gear 23 and the gear 24. Next, the finishing split mold 25 is closed, and at the same time, the bottom mold 26 is raised, and then the finish molding of the barrel portion 38 is performed by finish blowing from above the plunger ring 15. When the finish molding is completed, the finish split mold 25 is opened, the bottom mold 26 is lowered, the rotation of the whole mouth mold mechanism is stopped, and then the mouth mold 1 is opened, and the molded product is taken out. The opening of the mouth die 1 is performed by operating the rack gear 10 in the opposite manner to the case where the mouth die 1 is closed. At this time, the mouth die 1 is guided by the disc-shaped mouth die guide ring 9 located at the lower end of the plunger guide ring 15 to open in the horizontal direction. As a result, the screw-shaped portion of the mouth die 1 and the molded screw 37a can be released without interference. This is the same in the case of an uneven pattern. When closing the mouth die 1, the mouth die guide ring 9
Guided by and closed by horizontal movement.

The glass container 36 shown in FIGS. 8 and 9 manufactured by the above-described manufacturing apparatus and manufacturing method has glass protruding from the joint of the mouth die 1 in the mouth portion 37 including the screw 37a, glass cracking, and the like. In addition, the barrel portion 38 also had an excellent appearance without a mold die, as in the case of a product produced by a conventional blow-off method.

The glass container 39 shown in FIGS. 10 and 11 is
It is also manufactured by the manufacturing apparatus and the manufacturing method of the embodiment, and the uneven pattern 40 is formed at the mouth. The same applies to the glass container 41 shown in FIGS. 12 and 13, and a screw 42 is formed at the mouth. The body parts of both the glass containers 39 and 41 have an excellent appearance with no seamless shape.

In the method for producing a glass container of the present invention, the mouth portion is press-molded, a screw or an uneven pattern is formed on the outer periphery of the mouth portion, and then the glass is rotated by blow molding to form the body portion. Therefore, it is possible to manufacture a glass container which does not have a seamless body portion.

In the glass container manufacturing apparatus of the present invention, since the mouth mold is a split mouth mold that opens and closes horizontally, the screw formed on the outer periphery of the mouth of the glass container or the uneven pattern interferes with the appearance of the inner surface of the mouth mold. Without releasing the mold, it is possible to form a screw or a concavo-convex pattern on the outer circumference of the mouth of the glass container. Since the body portion is formed by the blow-blow as in the conventional apparatus, it is possible to manufacture a new type of glass container having a seamless appearance and an excellent appearance.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a glass container manufacturing apparatus of the present invention.

FIG. 2 is a plan view of the mouthpiece mechanism of FIG. 1 in a closed state.

FIG. 3 is a top view of the mouthpiece mechanism of FIG. 1 in an open state.

FIG. 4 is a sectional view of the mouthpiece mechanism of FIG. 1 in an open state.

5 is a bottom view of the mouthpiece mechanism of FIG. 1 in an open state. FIG.

FIG. 6 is a schematic cross-sectional view of a mouthpiece mechanism of a conventional blow-molding machine.

FIG. 7 is a bottom view of a mouthpiece mechanism of a conventional blow-molding machine.

8 is a top view of the glass container 36. FIG.

9 is a side view of the glass container 36. FIG.

FIG. 10 is a top view of the glass container 39.

11 is a side view of the glass container 39. FIG.

FIG. 12 is a top view of the glass container 41.

FIG. 13 is a side view of the glass container 41.

[Explanation of symbols]

 1 mouth type 1a circumferential groove 2 groove cam 3 gear 4 cam roller 5 hinge arm 6 hinge pin 7 hinge arm 8 groove 9 mouth type guide ring 10 rack gear 11 cylinder 12 piston rod 13 coil spring 14 pin 15 plunger ring 15a outer circumference of plunger ring 16 key 17 gear holding plate 18 pin 19 bracket 20 rough type 21 plunger 22 parison 23 pinion gear 24 gear 25 finishing split type 26 bottom type 27 ball bearing 28 molding machine body 29 mouth type 29a screw figure part 30 hinge arm 31 cam plate 32 Hinge arm upper end 33 Hinge arm lower end 34 Hinge pin 35 Coil spring 36 Glass container 37 Mouth part 37a Screw 38 Body part 39 Glass container 40 Uneven pattern 41 Glass container 42 Screw

Claims (2)

(57) [Claims] 1. A step of press-molding a split mouth die that opens and closes in a horizontal direction and a coarse die having a screw or uneven pattern on the outer periphery of the mouth portion, and finishing the parison and blowing in a split die. A process of forming a seamless body part by rotating blow molding in which the mouth die and the finish split die are relatively rotated, and the finish split die is split and released, and the die is horizontally split and released to the outer periphery. A method of manufacturing a glass container, comprising a step of taking out a molded glass container having a mouth portion having a screw or an uneven pattern and a seamless body portion. 2. A die for press-molding a parison,
In a blow container manufacturing apparatus for a glass container, comprising a rough mold and a press mechanism, and a finishing split mold for finishing a glass container by rotating and molding a parison, and a blow mechanism, the mouth mold is a split mouth mold that opens and closes horizontally. A device for manufacturing blown glass containers, characterized in that