JP6933376B2 - Manufacturing method of glass container and glass container - Google Patents

Description

The present invention relates to a method for manufacturing a glass container and a glass container.

The mainstream of conventional glass bottles is a type in which a screw groove is formed on the outer circumference of the mouth portion and the stopper is plugged with an external plug. A glass bottle that uses an inner plug is also provided, but a type that depends only on the elasticity of the inner plug, such as the inner plug of a one-box bottle, is generally used. In the literature, a technique for forming an internal screw in which an inner plug is fixed to the inner circumference of a glass bottle without relying solely on elasticity has also been proposed (see, for example, Patent Document 1).

By the way, a glass bottle is generally formed through a rough molding process (primary process) using a mouth mold and a rough mold and a finishing mold process (secondary process) using a finishing mold. Then, in Patent Document 1, the internal screw for fixing the inner plug is formed by using a plunger having a special shape whose tip is a screw shape in the primary step of forming the mouth portion.

Special Fair No. 5-65450

However, in the primary step, although the outer peripheral shape of the mouth portion is formed with relatively high precision along the inner peripheral shape of the mouth shape, the inner peripheral shape of the mouth portion tends to be relatively low precision. It is considered that this is because a large amount of wind power is applied to the inside of the bottle during blow molding, so that the unevenness on the inner circumference of the mouth is blown off before it is sufficiently solidified, and the uneven portion becomes gentle.

Therefore, the internal screw shown in Patent Document 1 has low dimensional accuracy. In particular, if it is attempted to form an internal screw or other engaging portion on the inner circumference of the bin with relatively small irregularities, the product error will increase due to the low accuracy of the engaging portion, and many bins will have poor sealing. That is also a concern. It is considered that such a situation is also one of the reasons why the outer plug type glass bottle accounts for the majority rather than the inner plug type.

It should be noted that such a problem may occur similarly regardless of whether the method for molding a glass container such as a glass bottle is blow-and-blow molding or press-and-blow molding.

The present invention has been made in view of the above circumstances, and provides a method for manufacturing a glass container and a glass container capable of forming an engaging portion for an inner plug formed on the inner circumference with high accuracy. The main purpose.

In order to achieve the above object, the method for manufacturing a glass container of the present invention is:
A roughing process in which the mouth part of the glass container is formed with respect to the gob and made into a parison by the mouth mold and the rough mold.
A finishing mold step of blowing compressed air from the mouth side of the parison to determine the overall shape of the glass container, depending on the finishing mold.
With
On the inner peripheral surface of the finished mold, a lower surface facing downward or diagonally downward is formed at a position corresponding to the neck of the glass container.
In the finishing mold process, by blowing the compressed air, the tubular packing for mounting the inner plug on the glass container is engaged at a position corresponding to the lower surface on the inner circumference of the neck portion. It is characterized by forming a surface.

According to the method for manufacturing a glass container of the present invention, in the finishing mold process in which the wall thickness can be easily made constant, a tubular shape for attaching an inner plug to the neck portion is formed by forming a lower surface on the inner circumference of the finishing mold. The engaging surface on which the packing is engaged can be manufactured with high precision.

The lower surface is preferably formed in an annular shape in the circumferential direction of the neck portion. In this way, the dimensional accuracy of the engaging surface is further improved as compared with the case where the engaging surface is formed in a part in the circumferential direction. Further, since the engaging surface is formed in an annular shape, there is an advantage that the directionality in the circumferential direction is lost on the tubular packing side.

Further, the tubular packing is provided with a claw portion to be engaged with the engaging surface, and after molding by the finishing mold step, the tubular packing is press-fitted from the mouth portion to press the claw portion into the claw portion. It is preferable to further include a step of engaging with the engaging surface. In this way, by press-fitting the tubular packing into the glass container, it is possible to seal between the engaging surface of the glass container and the claw portion of the tubular packing, and the tubular packing and the inner plug are separated. In the case of a body, it is possible to impart sealing performance to a glass container including a tubular packing.

The glass container of the present invention
A glass container having a mouth, a neck, a shoulder, a body, and a bottom.
The engaging surface on which the tubular packing for mounting the inner plug is engaged is integrally formed at a position below the drinking spout line on the inner peripheral surface of the neck portion.
The thickness of the neck portion corresponding to the engaging surface is substantially the same as the thickness of the neck portion where the engaging surface is not formed.
The claw portion provided on the tubular packing is engaged with the engaging surface.

According to the glass container of the present invention, an engaging surface is formed at a position below the drinking spout line in the neck portion, and by attaching a tubular packing there, the engaging surface and the tubular shape of the glass container are formed. It can be sealed between the packing. The thickness of the neck part corresponding to the engaging surface and the other positions are almost the same, and it can be said that this shape is formed by blow molding in the finishing mold process (secondary process) of the glass container. , The dimensional accuracy of the engaging surface is high, and a high sealing effect can be imparted to the glass container.

It is preferable that information visible from the outside of the glass container is displayed on the outer peripheral surface of the tubular packing via the neck portion. As a result, in the past, there was no choice but to attach a sticker to the outer peripheral side of the glass container, hang a POP on the neck, or print on the outer plug to display the information, but while being visible to the user, , Can be displayed on the inside of the container, which is difficult to access.

Further, the claw portion is provided at the lower end portion of the tubular packing, and the claw portion and the engaging surface seal between the inner circumference of the glass container and the outer circumference of the tubular packing. It is preferable to have. As a result, the contents such as liquid do not permeate into the gap between the inner circumference of the glass container and the outer circumference of the tubular packing, so that it is possible to prevent the appearance of the glass container from deteriorating. When displaying information on the outer peripheral surface, the display area can be widened.

Front view of the glass bottle. (A) is a front view showing a glass bottle, a tubular packing and an inner plug individually, and (b) is a cross-sectional view showing a state in which these are combined. The process explanatory drawing which shows the molding process of a glass bottle. FIG. 5 is a cross-sectional view showing another embodiment of a glass bottle, a tubular packing and an inner plug. A plan view showing another embodiment of the tubular packing and a cross-sectional view showing another embodiment of the glass bottle and the tubular packing.

Hereinafter, embodiments will be described with reference to the drawings.

<Glass bottle 11>
As shown in FIG. 1, the glass bottle 11 which is a typical example of a glass container is formed of transparent or translucent glass so that the inside of the bottle can be visually recognized from the outside of the bottle. The glass bottle 11 is integrally formed with a tubular body portion 12, a hem portion 13 continuous from the lower end side of the body portion 12, and a bottom portion 14 that closes the lower end of the hem portion 13. From the upper end side of the body portion 12, a shoulder portion 15 whose diameter decreases toward the upper side is integrally formed. From the upper end side of the shoulder portion 15, a neck portion 16 extending upward with substantially the same diameter is integrally formed except for the annular convex portion 21 described later. At the upper end of the neck portion 16, a mouth portion 17 having an inner peripheral side having substantially the same diameter as the neck portion 16 and an outer peripheral side having a diameter larger than that of the neck portion 16 is integrally formed. A mouthpiece line 18 formed in the manufacturing process of the glass bottle 11 is expressed near the boundary between the mouth portion 17 and the neck portion 16.

An annular convex portion 21 that is convex toward the outer periphery of the glass bottle 11 is integrally formed on the neck portion 16 at a position that is intermediate in the vertical direction and below the drinking spout line 18. The outer peripheral surface of the glass bin 11 corresponding to the annular convex portion 21 is a convex surface 22 when viewed from the outside, and the inner peripheral surface of the glass bin 11 corresponding to the annular convex portion 21 is a concave surface 23 when viewed from the inside. The upper part of the concave surface 23 is an engaging surface facing diagonally downward. The thickness of the annular convex portion 21, which is the distance between the convex surface 22 and the concave surface 23, is formed to be substantially the same as the peripheral surface other than the mouth portion 17, such as the neck portion 16 and the body portion 12. In the above description, the reason why they are not the same but are substantially the same is that it is impossible for the glass bottle 11 to have the same wall thickness and diameter in the production.

As shown in FIG. 2, a tubular packing 31 is attached to the inner peripheral side of the glass bin 11. The tubular packing 31 is for attaching the inner plug 41 while sealing the gap between the tubular packing 31 and the glass bottle 11. The tubular packing 31 is made of an elastic synthetic resin material such as polyethylene or silicone rubber. The tubular packing 31 includes a main body tubular portion 32 having an outer diameter formed to be the same as or slightly smaller than the inner diameter of the mouth portion 17 and the neck portion 16, and is press-fitted into the glass bottle 11 from above the opening of the mouth portion 17. .. A flange portion 33 projecting in the outer peripheral direction is integrally formed at the upper end portion of the main body tubular portion 32, and when the tubular packing 31 is press-fitted, it comes into contact with the upper surface of the mouth portion 17, and the tubular packing 31 is further formed. I try not to get inside the bottle.

A claw portion 34 projecting in the outer peripheral direction is integrally formed at the lower end portion of the main body cylinder portion 32. The claw portion 34 has a first tapered surface 35 whose outer diameter becomes smaller toward the lower side in the lower part in the vertical direction, and the outer diameter of the lower end portion of the claw portion 34 is the same as or equal to the inner diameter of the mouth portion 17. It is said to have a smaller diameter. As a result, when the tubular packing 31 is press-fitted into the glass bin 11, the first tapered surface 35 enters the inner peripheral side of the mouth portion 17, so that the tubular packing 31 does not get caught in the mouth portion 17 and the main body cylinder portion. The 32 and the claw portion 34 can be elastically deformed toward the inner peripheral side.

The claw portion 34 has a second tapered surface 36 whose outer diameter becomes larger toward the lower side in the upper part in the vertical direction. The lower end of the second tapered surface 36 is connected to the upper end of the first tapered surface 35, and the upper end of the second tapered surface 36 is connected to the outer peripheral surface of the main body tubular portion 32. The distance between the flange portion 33 and the claw portion 34 is preset so that the flange portion 33 abuts on the upper end of the mouth portion 17 at the position where the second tapered surface 36 abuts on the upper portion of the concave surface 23. ing.

The upper portion of the concave surface 23 is formed so as to extend diagonally downward so that the inner diameter of the glass bin 11 increases downward, and when the flange portion 33 is in contact with the upper end of the mouth portion 17, the claw portion 34 Preload is applied at the contact portion between the second tapered surface 36 and the upper portion of the concave surface 23. Therefore, the space between the glass bin 11 and the tubular packing 31 is sealed between the second tapered surface 36 of the claw portion 34 and the upper portion of the concave surface 23, and the contents of the glass bin 11 are above the sealing portion between them. Is prevented from entering. Therefore, when a guide display 37 for guiding information such as advertisements and prizes is printed on the outer peripheral surface of the tubular packing 31 mainly composed of the main body cylinder portion 32, the contents of the glass bin 11 are passed through the glass bin 11. The guidance display 37 can be visually recognized from the outside without getting in the way.

The inner plug 41 is pushed into the tubular packing 31 from above. The inner plug 41 includes a cylindrical sealing portion 42 having a certain elasticity that enters the main body tubular portion 32, and a flange-shaped operating portion 43 extending from the upper end of the sealing portion 42 to the outer peripheral side. By pushing the inner plug 41 into the tubular packing 31 from above to downward, the outer peripheral surface of the sealing portion 42 and the inner peripheral surface of the main body tubular portion 32 are elastically brought into close contact with each other. As a result, the contents of the glass bottle 11 are prevented from leaking from between the inner plug 41 and the tubular packing 31. When the inner plug 41 is pushed into the tubular packing 31, the operation portion 43 is positioned at a position where it abuts on the upper surface of the flange portion 33. The operation unit 43 is an operation target that can be pulled by hand when the inner plug 41 is pulled out at the time of opening while preventing the inner plug 41 from getting into the inside of the glass bottle 11. If there is another opening method such that the upper end of the sealing portion 42 is arranged above the upper end of the tubular packing 31 in the fixed state of the inner plug 41, the operating portion 43 is not essential.

<Manufacturing method of glass bottle 11>
Next, with reference to FIG. 3, a method for manufacturing the glass bottle 11 configured as described above will be described together with a manufacturing apparatus such as a mold used for the manufacturing. In the present embodiment, the glass bottle 11 is manufactured by blow-and-blow molding, but it may be manufactured by press-and-blow molding.

The blow & blow molding process of the glass bottle 11 includes a rough mold process (primary process) and a finish mold process (secondary process). The roughing process includes a gob-in process, a settle blow process, and a counter blow process. After the rough molding process, an inverting process that shifts to the finishing mold process is executed. The finishing type process includes a final blow process. Hereinafter, each step will be described.

(A) Gob-in process As shown in FIG. 3 (a), a mouth mold 52 is arranged at the lower end portion of the rough mold 51 formed in a tubular shape penetrating in the vertical direction. The mouth mold 52 is formed in an annular shape, and a mouth portion forming recess 53 matching the outer peripheral shape of the mouth portion 17 is formed in an annular shape on the inner circumference of the mouth mold 52. A plunger 54 is inserted from below on the inner peripheral side of the mouth mold 52. The most advanced portion of the plunger 54 is formed in a dome shape, and the outer peripheral diameter of the tip portion excluding the most advanced portion is formed to be the same as the inner peripheral diameter of the mouth portion 17. On the other hand, a funnel-shaped funnel 55 is arranged at the upper end of the rough mold 51.

In the gob-in step, the plunger 54 is in contact with the inner peripheral surface of the mouth mold 52 at a position below the mouth forming recess 53, and the cavity of the rough mold 51 is closed downward by the mouth mold 52 and the plunger 54. In this state, a high-temperature gob (glass gob) G formed by melting glass is guided by the funnel 55 and then thrown into the cavity of the rough mold 51 (gob-in). The gob G stays in the cavity of the coarse mold 51 with its lower end supported by the most advanced portion of the plunger 54.

(B) Settle blow step The settle blow step is executed after the gob-in step. In this step, as shown in FIG. 3B, the baffle 56 is arranged at the upper end of the funnel 55. Then, compressed air is blown into the rough mold 51 from a compressor (not shown) through the air passage formed in the baffle 56 (settle blow), so that the gob G in the rough mold 51 is pressed downward and deformed. .. By the pressing, the mouth portion 17 is substantially formed by the lower end portion of the gob G that has entered between the mouth portion forming recess 53 and the plunger 54.

(C) Counter blow step The counter blow step is executed after the settle blow step. In this step, as shown in FIG. 3C, the funnel 55 is retracted from the upper end portion of the rough mold 51, and the baffle 56 is arranged at the upper end portion of the rough mold 51. In this state, the lower surface of the baffle 56 closes the upper part of the cavity of the rough mold 51.

On the other hand, when the plunger 54 retracts below the mouth mold 52 by a certain distance, an air passage is formed between the plunger 54 and the mouth mold 52. By blowing compressed air into the rough mold 51 (counter blow) from a compressor (not shown) through this air passage, the gob G in the rough mold 51 is along the cavity formed by the lower surfaces of the rough mold 51 and the baffle 56. In addition, a parison P, which is a prototype of a bottle shape that opens downward, is formed.

(D) Invert process This process shifts from the rough mold process (primary process) to the finish mold process (secondary process). The inverting step is a step of charging the parison P formed by the roughing step into the finishing die 61. Specifically, as shown in FIGS. 3A to 3C, the mouth mold 52 used up to the counter blow step is gripped by the mouth mold holder 63 of the reversing device 62 in the rough molding process. ..

After the roughing process is completed, the baffle 56 is retracted, the roughing die 51 is opened, and the rotating shaft 64, which is the horizontal axis of the reversing device 62, is rotated 180 degrees. As a result, the parison P is also inverted by 180 degrees together with the mouth mold holder 63 and the mouth mold 52, and the parison P can be inserted (inverted) into the cavity of the finishing mold 61 as shown in FIG. 3 (d). The cavity shape of the finishing die 61 is defined by the inner peripheral shape of the finishing die 61 and the upper surface shape of the bottom die 65 installed at the lower end of the finishing die 61.

(E) Final Blow Step After the inverting step is completed, the mouth mold 52 is opened, and the mouth mold holder 63 is retracted from the finishing mold 61 together with the mouth mold 52. After that, as shown in FIG. 4 (e), the blow head 66 is mounted on the upper surface of the finishing mold 61. The blow head 66 is formed with an air passage that penetrates in the vertical direction. Compressed air from a compressor (not shown) is blown into the parison P housed in the cavity of the finishing die 61 through this air passage (final blow). As a result, the parison P expands along the cavity shape (figure surface) of the finishing mold 61, and as shown in FIG. 4 (f), the high-temperature glass bottle 11 having a substantially uniform wall thickness except for the mouth portion 17. Is formed.

After that, the finishing mold 61 is opened, and the mouth portion 17 of the glass bottle 11 is lifted by a gripping mechanism such as a take-out tong and transferred to a cooling or other transfer process. When molding the parison P in the primary step, the mouth portion 17 is generally formed by the mouth mold 52, and then, in the secondary step, other than the mouth portion 17 is formed by the final blow, so that the mouth portion 17 is restrained by the mouth mold 52. The spout line 18 will be formed between the portion and the portion formed to have a uniform wall thickness by the final blow.

Here, on the inner peripheral surface of the finishing mold 61, an annular groove 67 having the same inner peripheral shape as the convex surface 22 is provided at a position corresponding to the annular convex portion 21 of the glass bin 11 in order to form the annular convex portion 21. It is formed. The surface of the annular groove 67 that forms the upper part and faces diagonally downward is the lower surface. Since the annular convex portion 21 is formed on the inner peripheral surface of the annular groove 67 by the final blow, it is formed to have a wall thickness substantially the same as that of other portions other than the mouth portion 17 and a uniform wall thickness. As a result, the annular convex portion 21 has high-precision dimensions as designed. Further, since the annular convex portion 21 is formed by the final blow, it is located below the spout line 18.

After the finishing mold process of the glass bottle 11 is completed, in the manufacturing factory of the glass bottle 11 or another factory, a sealing process of press-fitting the tubular packing 31 from the mouth 17 side to seal the glass bottle 11 and the contents (for example, juice, etc.) in the glass bottle 11 A filling step of filling the drink) and a sealing step of attaching and sealing the inner plug 41 are carried out. The filling step may be performed before or after the sealing step.

<Effects obtained from this embodiment>
According to the glass bottle 11 and the manufacturing method thereof described above, the following effects can be obtained.

An annular convex portion 21 is formed as an engaging portion for engaging the tubular packing 31 in a portion of the neck portion 16 below the spout line 18. As a result, the inner plug 41 can be used for the glass bottle 11 within a range where there is little product error. Further, since the annular convex portion 21 and the claw portion 34 are both formed in an annular shape having the same shape in the entire circumferential direction, there is an advantage that the tubular packing 31 is not directional when the tubular packing 31 is attached.

Since the conventional engaging portion is formed by devising the shape of the plunger in the rough molding process, there is a problem that the dimensional accuracy of the engaging portion is low. In this regard, the annular groove 67 is formed in the finishing mold 61, and the annular convex portion 21 which is the engaging portion is formed by the final blow in the finishing mold process, so that the wall thickness becomes constant in dimensional accuracy. The high annular protrusion 21 can be formed. Therefore, even if the annular convex portion 21 and the claw portion 34 are relatively small, the dimensional error is small, and the space between the two can be reliably sealed. Further, the annular convex portion 21 can be formed in exactly the same process as the conventional forming process of the glass bottle 11 only by changing the inner peripheral shape of the finishing mold 61, which has an advantage that the production line is not significantly changed.

A guide display 37 that can be visually recognized from the outside of the transparent glass bin 11 can be attached to the outer peripheral surface of the tubular packing 31 by printing or the like. Moreover, since the annular convex portion 21 and the claw portion 34 seal between the neck portion 16 and the tubular packing 31, the contents of the glass bin 11 do not interfere with the guide display 37. Further, since the claw portion 34 forming the seal point with the glass bin 11 is provided at the lower end portion of the tubular packing 31, the area for the guide display 37 can be widened. Therefore, it is possible to impart a part of various indications that have been performed on the outer circumference of the glass bin 11 to the inner circumference side of the glass bottle 11 as in the conventional case. Since it is not easy to access the display performed on the inner peripheral side of the glass bin 11, there is an advantage that problems such as modification of the guidance display 37 are unlikely to occur.

<Modification example of glass bottle 11, tubular packing 31, and inner plug 41>
Hereinafter, modifications of the glass bottle 11, the tubular packing 31, and the inner plug 41 will be described.

(1) In the above embodiment, the tubular packing 31 and the inner plug 41 are shown as separate bodies, but these may be integrated. For example, as shown in FIG. 4A, the upper surface of the main body tubular portion 32 of the tubular packing 31 may be sealed by the sealing portion 71 to form an inner plug 72 that also functions as a packing.

(2) As shown in FIG. 4B, the portion of the neck portion 16 of the glass bin 11 that engages with the claw portion 34 of the tubular packing 31 may be a stepped portion 74 instead of the annular convex portion 21. The step portion 74 is inclined so that the diameter becomes larger toward the lower side, and the neck portion 16 has a larger diameter below the step portion 74 than above the step portion 74. The step portion 74 is also formed by matching the inner peripheral shape of the finishing mold 61 to these shapes in the finishing mold process (secondary process).

(3) As shown in FIG. 4C, the portion of the neck portion 16 of the glass bin 11 that engages with the claw portion 34 of the tubular packing 31 may be an annular recess 75 instead of the annular convex portion 21. The annular recess 75 is formed by an annular portion recessed toward the inner circumference side when viewed from the outer circumference of the glass bottle 11, and an annular convex surface protruding toward the inner circumference side is formed when viewed from the inner circumference side of the glass bottle 11. The annular recess 75 is also formed by matching the inner peripheral shape of the finishing mold 61 to these shapes in the finishing mold step (secondary step).

When the annular recess 75 is adopted, the outer diameter of at least the portion corresponding to the annular recess 75 in the outer peripheral portion of the tubular packing 31 is set to the minimum inner diameter of the annular recess 75 (the inner diameter of the maximum protruding portion toward the inner peripheral side). It should be the same or smaller. Thereby, the resistance at the time of press-fitting the tubular packing 31 can be reduced. Further, in this case, a stepped surface 76 having a downwardly oriented surface is formed at the upper end of the portion where the outer diameter of the tubular packing 31 is reduced. In the above embodiment, a preload is applied to the seal portion of the second tapered surface 36 by the distance between the flange portion 33 and the claw portion 34, but in this modified example, the distance between the stepped surface 76 and the claw portion 34 causes the first pressure. Preload can also be applied to the seal portion of the 2 tapered surface 36. In this case, the flange portion 33 does not need the function of applying the preload.

(4) As shown in FIG. 4D, a tubular packing 31 having an internal screw 73 formed on the inner peripheral surface may be used. In this case, an inner plug having an outer screw formed on the outer circumference is used. FIG. 4 (e) shows an example in which the internal screw 73 is formed in the modified example of FIG. 4 (b). FIG. 4F shows an example in which the internal screw 73 is formed in the modified example of FIG. 4C, and the flange portion 33 is omitted when the function of applying the preload to the flange portion 33 is no longer necessary. An example is shown.

(5) As shown in the above embodiment and the above modification, the claw portion 34 is engaged with the annular convex portion 21, the step portion 74, and the annular concave portion 75, which are the engagement portions of the glass bottle 11 with the tubular packing 31. It suffices if a surface (engagement surface) facing downward is formed on the inner peripheral surface so as to be possible. Therefore, the engaging surface may be directed directly downward rather than diagonally downward.

(6) The annular convex portion 21, the step portion 74, and the annular concave portion 75, which are the engaging portions of the glass bottle 11 with the tubular packing 31, are formed at any height of the neck portion 16 below the drinking spout line 18. It suffices if it is done. When the engaging portion is formed at a relatively lower portion of the neck portion 16, the length of the tubular packing 31 in the vertical direction becomes long, so that the display area of the guidance display 37 becomes large, and advertisements, contents, etc. are displayed. It is possible to select various display modes.

(7) Depending on the contents of the glass bottle 11, the upper surface of the tubular packing 31 may be simply closed with a thin seal such as a film instead of the inner plug 41. In this case, it can be said that the inner plug is composed of the tubular packing 31 and the thin seal. Further, the inner plug does not have to completely seal the opening of the mouth portion 17, and includes, for example, an inner plug having a through hole that allows a predetermined amount of tablets to be discharged.

(8) For recycling of the glass bottle 11, it is preferable that the tubular packing 31 can be easily removed by the user without using a tool. For example, as shown in FIG. 5A, a knob portion 81 projecting from the flange portion 33 of the tubular packing 31 toward the outer peripheral side is integrally formed. In this way, the tubular packing 31 can be deformed by pulling the tip end side of the knob portion 81 toward the base end side of the grip portion 81 by hand after the contents are exhausted. Then, the tubular packing 31 can be pulled out by lifting the knob 81 upward with the tubular packing 31 deformed to some extent. Since the tubular packing 31 is sealed with the inner circumference of the glass bottle 11 at the claw portion 34, the portion of the tubular packing 31 above the claw portion 34 and the portion where the wall thickness is thinned and the broken portion are vertically oriented. It may be formed so that the deformation of the tubular packing 31 is promoted when the grip portion 81 is pulled.

(9) In the type in which the internal screw 73 is formed on the tubular packing 31, if the content of the glass bottle 11 is lubricated such as oil, the tubular packing 31 will rotate with respect to the glass bottle 11. There is a possibility that the inner plug 41 and the tubular packing 31 rotate together to make it difficult to attach / detach the inner plug 41. Therefore, when the internal screw 73 is formed, the tubular packing 31 can be prevented from rotating with respect to the glass bin 11. For example, it is conceivable that the cross-sectional (horizontal cross-sectional) shape of the neck portion 16 is made into a non-perfect circular shape by making it a polygon such as a quadrangle or an ellipse. If the main body tubular portion 32 of the tubular packing 31 is formed so as to have a non-circular cross-sectional shape in accordance with this shape, the tubular packing 31 does not rotate with respect to the glass bin 11.

(10) In the above modified example (9), an example is shown in which the shape of the neck portion 16 of the glass bottle 11 is changed to prevent the inner plug 41 and the tubular packing 31 from rotating, but it depends on the shape of the neck portion 16. It is also possible to prevent the rotation without going around. For example, as shown in FIG. 5B, a convex portion 82 is provided on a part of the upper surface of the mouth portion 17 of the glass bin 11 in the circumferential direction, and the convex portion 82 is fitted on the lower surface of the flange portion 33 of the tubular packing 31. A recess 83 to be inserted is provided. With such a keyway structure, it is possible to prevent the tubular packing 31 from rotating with respect to the glass bin 11. Further, as shown in FIG. 5C, a concave portion 84 may be provided on a part of the upper surface of the mouth portion 17 in the circumferential direction, and a convex portion 85 that fits into the concave portion 84 may be provided on the lower surface of the flange portion 33.

11 ... glass bottle (glass container), 12 ... body, 13 ... hem, 14 ... bottom, 15 ... shoulder, 16 ... neck, 17 ... mouth, 18 ... drinking line, 21 ... annular convex, 22 ... Convex surface, 23 ... Concave surface (engagement surface), 31 ... Cylindrical packing, 32 ... Main body tubular portion, 33 ... Flange portion, 34 ... Claw portion, 35 ... First tapered surface, 36 ... Second tapered surface, 37 ... Guide Display, 41 ... Inner plug, 42 ... Sealing part, 43 ... Operation part, 51 ... Rough type, 52 ... Mouth type, 53 ... Mouth forming recess, 54 ... Plunger, 55 ... Funnel, 56 ... Baffle, 61 ... Finish Mold, 62 ... Reversing device, 63 ... Mouth mold holder, 64 ... Rotating shaft, 65 ... Bottom mold, 66 ... Blow head, 67 ... Circular groove, 71 ... Sealing part, 72 ... Inner plug, 73 ... Internal screw, 74 ... stepped portion, 75 ... annular concave portion, 76 ... stepped surface, 81 ... knob portion, 82 ... convex portion, 83 ... concave portion, 84 ... concave portion, 85 ... convex portion, G ... gob, P ... parison.

Claims (6)

A roughing process in which the mouth part of the glass container is formed with respect to the gob and made into a parison by the mouth mold and the rough mold.
A finishing mold step of blowing compressed air from the mouth side of the parison to determine the overall shape of the glass container, depending on the finishing mold.
With
On the inner peripheral surface of the finished mold, a lower surface facing downward or diagonally downward is formed at a position corresponding to the neck of the glass container.
In the finishing mold process, by blowing the compressed air, the tubular packing for mounting the inner plug on the glass container is engaged at a position corresponding to the lower surface on the inner circumference of the neck portion. A method for manufacturing a glass container, which comprises forming a surface. The method for manufacturing a glass container according to claim 1, wherein the lower surface is formed in an annular shape in the circumferential direction of the neck portion. The tubular packing is provided with a claw portion that is engaged with the engaging surface.
The method for manufacturing a glass container according to claim 1 or 2, further comprising a step of press-fitting the tubular packing from the mouth portion and engaging the claw portion with the engaging surface after molding by the finishing mold step. .. A glass container having a mouth, a neck, a shoulder, a body, and a bottom.
The engaging surface on which the tubular packing for mounting the inner plug is engaged is integrally formed at a position below the drinking spout line on the inner peripheral surface of the neck portion.
The thickness of the neck portion corresponding to the engaging surface is substantially the same as the thickness of the neck portion where the engaging surface is not formed.
A glass container characterized in that a claw portion provided on the tubular packing is engaged with the engaging surface. The glass container according to claim 4, wherein information visible from the outside of the glass container is displayed on the outer peripheral surface of the tubular packing via the neck portion. The claw portion is provided at the lower end portion of the tubular packing, and the claw portion and the engaging surface seal the inner circumference of the glass container and the outer circumference of the tubular packing. Item 4. The glass container according to Item 4.

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