JP4291810B2 - Glass bottle - Google Patents

Description

  The present invention relates to a glass bottle for packaging and storing various contents such as beverages and seasonings.

  Generally, a glass bottle is manufactured by transferring a parison molded in a rough mold to a finishing mold, blow molding, opening the finishing mold, completing molding, and taking out the bottle. FIG. 8 is an explanatory diagram of a state when the finishing mold is opened. When the finishing mold (not shown) opens left and right from the joint line X, the molded glass bottle 1 may be pulled by one mold and tilted. The case of FIG. 8 shows a state in which the left side mold is pulled and the left side is inclined. Then, the position S1 of the shoulder portion of the glass bottle at the joint line X moves (rises) to S2, interferes with the joint portion of the left mold, and a so-called “shouldering” scratch occurs. Such a shoulder is prominently generated in a glass bottle having a shoulder shape.

The following patent document discloses a technique for preventing the glass bottle from being tilted by restricting the position of the glass bottle by fitting and holding the bottle mouth portion with a blow head when the finishing mold is opened. Such a technique raises the blow head by a small distance when the finishing mold is opened and holds the bottle opening portion loosely by the blow head. However, the slight gap between the blow head and the finishing mold is adjusted. In addition to being difficult, there is a risk of chattering due to interference between the blow head and the bottle mouth, and it is necessary to add a complicated mechanism to the molding machine, which increases costs and is realistic. I couldn't.
Japanese Utility Model Publication No. 60-32086 Japanese Utility Model Publication No. 63-7136

  An object of the present invention is to prevent the occurrence of shoulder stiffness without improving the molding machine by devising the outer shape from the neck portion to the shoulder portion of the bottle.

[Claim 1]
The present invention is a curved line in which a portion between a neck portion that is a straight line and a shoulder portion that is a convex curve is smoothly connected to a plurality of circular arcs that are convex downward in a longitudinal section of the outer shape at least at the finish type joint line. The glass bottle is characterized in that the radius of the arc is larger as it is closer to the shoulder, and the number of arcs is 2 or more.

[Claim 2]
Further, the present invention provides a relaxation curve in which the radius of curvature becomes larger as the portion between the neck portion that is a straight line and the shoulder portion that is a convex curve is closer to the shoulder portion in the longitudinal section of the outer shape at least at the finish type joint line. A glass bottle characterized by comprising

[Claim 3]
Further, according to the present invention, in the longitudinal cross section at the finishing line of the finishing mold, the radius of curvature at the point M where the amount of interference between the glass bottle and the finishing mold is maximum when the finishing bottle is opened is 50 mm or more. der Ru is a glass bottle according to claim 1 or 2. In the normal case, the point at which the amount of interference between the glass bottle and the finishing mold is maximized is determined without being influenced by the inclination amount of the glass bottle. However, in order to further clarify the present invention, the point M is defined by the finishing mold. It is defined as the point at which the amount of interference is maximized when the neck of the glass bottle is pulled by one finishing mold and moved laterally with the finishing mold when opened 5 mm on one side.

  In the glass bottle of the present invention, when the mold and the glass bottle interfere with each other at the joint line when the finish mold is opened, the point M (that is, the point where the glass collides with the mold) becomes the conventional shape. Therefore, the curvature of the outer shape of the glass bottle at the point M is increased, and the stress generated in the portion is reduced, so that the possibility of occurrence of chatter is extremely reduced.

  FIG. 1 is an explanatory view showing the outer shape of the glass bottle 1 of the embodiment from the neck to the shoulder. In the figure, the neck 2 is a straight line above the point A, and the shoulder 3 is a convex curve upward from the point E. The points A to E are curves formed by smoothly connecting a plurality of (three) downwardly convex arcs. In the present invention, “smooth connection” means a state in which the tangents of the arcs on both sides coincide at the connection point. Points A to B are Ra (radius) = 5 (mm), points B to C are Rb = 50, points C to D are Rc = 200, and points D to E are straight lines. In addition, although it is thought that a straight line is a circular arc curve of R = ∞, the straight line is not regarded as a circular arc in the present invention.

  FIG. 2 is an explanatory view showing the outer shape of the conventional glass bottle 1 (comparative example) from the neck to the shoulder. In the figure, the neck 2 is a straight line above the point a, and the shoulder 3 is a convex curve upward from the point c. The points a to b are Ra (radius) = 5 (mm), and the points B to C are straight lines. Therefore, the number of arcs protruding downward between the neck and shoulder is one. Thus, in the conventional shape, there is a convex arc curve directly below the neck and below the radius Ra, and below that is a straight line, or immediately becomes a convex curve (shoulder). In other words, in the conventional shape, the number of arcs that are convex under the portion between the neck portion that is a straight line and the shoulder portion that is a convex curve is one.

  FIG. 3 shows the amount of interference between the finishing mold and the glass when the glass bottle 1 of the above embodiment is tilted when the mold is opened (when the finishing mold is opened 5 mm and the neck is moved 5 mm laterally). It is expressed by taking the axial distance (height). The height of the point M where the amount of interference is maximum is 191.5 mm, and the maximum value of the amount of interference is about 0.9 mm. As shown in FIG. 1, the radius of the arc in the outline of the glass bottle at the point M is Rc = 200 mm.

  FIG. 4 shows the amount of interference between the finishing mold and glass when the glass bottle 1 of the comparative example is tilted when the mold is opened (when the finishing mold is opened 5 mm and the neck is moved 5 mm laterally). It is expressed as a height. Here, the “5 mm open position” is adopted, and chatter does not occur at this position, but it is easy to relatively compare the amount of interference between the glass and the formwork and the maximum interference position. Because. The amount of interference increases linearly with mold opening. The height of the point M where the amount of interference is maximum is 196.5 mm at a position higher than that in the embodiment, and the maximum value of the amount of interference is about 0.9 mm, which is the same as in the embodiment. As shown in FIG. 2, the radius of the arc in the outline of the glass bottle at point M is Ra = 5 mm.

  FIG. 5 shows the calculation result of how the impact force generated by the interference changes depending on the radius of curvature of the glass bottle point M where the amount of interference is maximum (ie, the point where the glass collides with the mold). Show. In the figure, “R10”, “R5”, and “R3” indicate the radius of curvature (Ra) of the curve immediately below the neck, “R10” is Ra = 10 mm, “R5” is Ra = 5 mm, and “R3”. Is the case where Ra = 3 mm. The vertical axis represents the magnitude of the impact force at point M in percentage (%), and the horizontal axis represents the radius of curvature at point M. Thus, the impact force generated at the point M is related to the curvature radius (Ra) of the curve just below the neck and the curvature radius of the point M, and in any case of Ra, the larger the curvature radius of the point M, the more the point becomes. The local stress of M becomes small.

  As is apparent from FIG. 5, the impact force at the point M rapidly decreases until the radius of curvature at the point M reaches a minimum value of 50 mm, and gradually decreases from 50 mm to 200 mm. Therefore, it is desirable that the radius of curvature at the point M is 50 mm or more.

  In the above example, Ra = 5 mm, the radius of curvature of the point M is 200 mm, and in the comparative example, Ra = 5 mm, and the radius of curvature of the point M is 5 mm. It has been reduced to 19% of the force, so there is little shouldering.

  As described above, in the present invention, when the mold and the glass bottle interfere with each other at the seam line, the point M at which the interference amount becomes maximum is lower than the conventional shape, and the outline of the glass bottle at the point M is Since the curvature is increased and the impact force generated in the portion is reduced, the possibility of occurrence of chatter is extremely reduced.

  6 and 7 relate to a glass bottle 1 of another embodiment. The outer shape from the neck to the shoulder at the seam line X of the glass bottle 1 is indicated by a line p in FIG. This shape is the same as that in the previous embodiment. In FIG. 6, the outer shape from the neck portion to the shoulder portion in the portion indicated by the region Q, that is, the portion excluding 30 ° on both sides from the joint line X is indicated by the line q in FIG. This shape is the same as that in the comparative example. In the region (P) 30 ° on both sides from the joint line X, the outer shape from the neck portion to the shoulder portion changes gently from the line p to the line q in FIG.

  This glass bottle is a glass bottle with a sharp shoulder design because the outer shape from the neck to the shoulder is almost the shape of the line q (FIG. 7). Although such a sharp shoulder design tends to be preferred, there is a problem that shoulder stiffness tends to occur. In the present embodiment, since the shape of the seam line X is q (FIG. 7), there is almost no possibility of shoulder warp, and the shape of the seam line is hardly noticeable, and the overall shoulder is sharp. The impression of the design is maintained.

  In the embodiment, a case has been described in which a straight neck portion to a shoulder portion having an upward convex curve is configured by a curved line in which three downward convex arcs are smoothly connected. In the case of 2 or 4 or more, and also in the case of a relaxation curve in which the curvature of the arc changes steplessly, the point M at which the amount of interference becomes maximum is lower than the conventional shape, and the glass bottle at the point M There is an effect similar to the above embodiment in which the curvature of the outer shape is increased, the impact force generated in the portion is reduced, and the possibility of occurrence of shoulder stiffness is reduced.

It is explanatory drawing of the external shape from the neck part of the glass bottle of an Example to a shoulder part. It is explanatory drawing of the external shape from the neck part to the shoulder part of the glass bottle of a comparative example. It is explanatory drawing of the interference amount of the glass bottle of an Example, and a finishing die. It is explanatory drawing of the interference amount of the glass bottle of a comparative example, and a finishing type | mold. It is explanatory drawing of the relationship between the curvature radius in the point M, and local stress. It is a top view of the glass bottle of an Example. It is explanatory drawing of the external shape from the neck part of the glass bottle of FIG. 6 to a shoulder part. It is explanatory drawing of a mode that a glass bottle inclines when a finishing type | mold is opened.

Explanation of symbols

1 Glass bottle 2 Neck 3 Shoulder

Claims (3)

In the longitudinal section of the outer shape, at least at the finish type joint line,
The part between the neck that is a straight line and the shoulder that is a convex curve
It has a curve that smoothly connects a plurality of downward convex arcs,
The radius of the arc is larger as it is closer to the shoulder,
And the number of circular arcs is 2 or more, The glass bottle characterized by the above-mentioned. In the longitudinal section of the outer shape, at least at the finish type joint line,
The part between the neck that is a straight line and the shoulder that is a convex curve
A glass bottle characterized by a relaxation curve in which the radius of curvature increases toward the shoulder. In longitudinal section of the blow mold case Looking outline, wherein a radius of curvature at the point M interference of the glass bottles and blow mold is maximized when the vial is inclined when the mold opening finish type Ru der least 50mm claim 1 or 2 glass bottles.

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