JP7438623B2 - Synthetic resin bottles and preforms - Google Patents

Description

The present invention relates to a synthetic resin bottle sealed with a screw cap and a preform thereof.

BACKGROUND OF THE INVENTION Synthetic resin bottles whose necks are sealed with screw caps are widely used as bottles filled with liquids such as various beverages. For such bottles, the screw cap must be tightly wound to ensure a good seal, but on the other hand, if the screw cap is excessively tightened, it may be difficult for the consumer to open the screw cap. There is a risk that it will happen. Therefore, when tightening and sealing a bottle with a screw cap, it is necessary to perform the capping (tightening of the screw cap) in a state that ensures proper sealing performance and unsealability.

In Patent Document 1, marks having a certain positional relationship are provided on the outer periphery of a neck ring formed on a bottle and on the outer surface of a screw cap that is screwed onto the mouth of the bottle. After wearing, it is determined whether or not capping has been properly performed based on the confirmation of the tightening angle based on the positional relationship between the mark on the bottle side and the mark on the screw cap side.

Japanese Patent Application Publication No. 10-203512

However, in the case of synthetic resin bottles where the screw cap structurally covers the neck ring, the screw cap hides the mark on the bottle side, so the mark on the bottle side and the mark on the screw cap side can be seen from the outside. There is a problem in that it is not possible to confirm the seaming angle based on the positional relationship with the capping, and as a result, it is not possible to determine whether or not capping has been properly performed.

The tightening angle can also be confirmed by opening the screw cap, but in the case of a synthetic resin bottle equipped with a sealing ring to prevent tampering, the screw cap and sealing ring should be removed when the bottle is opened. The connecting piece that connects the container with the bottle must be broken, and the tamper-proofing function will no longer be achieved, making it impossible to sell the synthetic resin bottle after opening.

In order to solve the above-mentioned problems in the prior art, the present invention provides a synthetic resin bottle and a synthetic resin bottle in which the tightening angle can be reliably confirmed from the outside based on the positional relationship between the mark on the bottle side and the mark on the screw cap side. The challenge is to create a preform, which is a preformed body.

Among the means for solving the above problems, the first main means of the present invention is:
A shoulder section connected to the bottom via the body, a mouth tube section erected above the shoulder section, a male thread formed on the mouth tube section, and an annular neck protruding outward. A synthetic resin bottle comprising a ring,
Near the shoulder, an indicator mark whose circumferential position corresponds to the starting end of the male thread is formed vertically in the area from the lower part of the neck ring to the shoulder, and is a blow indicator mark. It is characterized by being formed with a wider width than the parting line formed on the outer peripheral surface of the bottle after molding.
According to the first main means of the present invention, even if the screw cap structurally covers the neck ring, it is possible to easily and reliably determine whether capping with the screw cap has been properly performed. .
Furthermore, since the indicator mark on the bottle side can be placed near the indicator mark on the cap side, it is possible to easily check the seaming angle.

Another means of the present invention is one in which the indicator mark is formed in the form of a dot, a vertical line, a triangle, or a rhombus.
With the above means, the indicator mark can be formed in various variations.

Another means of the present invention is one in which the width of the indicator mark is set to 0.2 to 5.0 mm in addition to any of the above means.
With the above means, since it can be easily distinguished from the parting line, it is possible to prevent misjudgment as to whether capping has been properly performed.

Further, another means of the present invention is that the indicator mark is formed as a recess or a convex part in any of the above means, and the depth of the recess or the height of the convex is set to 0.000 mm from the surface of the bottle. 03 to 1.00 mm.
With the above means, it is possible to use the bottle without affecting its function in any way.

Further, another means of the present invention is one in which the indicator mark is formed in a triangular shape in cross section with the center position in the width direction as the apex in the thickness direction. be.
With the above means, since the center position of the indicator mark in the width direction can be set as the apex of the indicator mark, it becomes possible to more accurately detect the seaming angle around the container axis.

Further, the second main means of the present invention is
This preform is characterized in that it has a mouth at the upper end of a cylindrical body and is molded into any of the synthetic resin bottles described above by biaxial stretch blow molding.
In the second main means of the present invention, it is possible to obtain a preform for molding a synthetic resin bottle, which is the first main means.

Further, another means of the present invention is such that the indicator mark is formed by a dot, a vertical line, a triangle, or a rhombus.
With the above means, it is possible to provide preforms with various indicator marks.

Further, another means of the present invention is one in which the indicator mark is formed in a triangular shape in cross section with the center position in the width direction as the apex in the thickness direction. be.
With the above means, it is possible to provide a preform with an indicator mark whose apex is the center position in the width direction.

Since the present invention has the above-described configuration, it has the following effects.
In the present invention, even if the screw cap structurally covers the neck ring, it is possible to easily and reliably determine whether capping with the screw cap has been properly performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a synthetic resin bottle showing a first embodiment of the present invention. 1A and 1B are cross-sectional views taken along line III-III in FIG. 1, in which (a) shows an indicator mark made of a recessed part, and (b) shows an indicator mark made of a convex part. FIG. 2 is a front view showing a preform, which is a preform of the synthetic resin bottle shown in FIG. 1. FIG. FIG. 3 is a partial front view of the synthetic resin bottle showing the positional relationship between the screw cap and the mouth barrel part, with (a) showing a state in the middle of screwing, and (b) showing a state in which screwing is completed. A second embodiment of the present invention is shown, in which (a) is a partial front view of a synthetic resin bottle, and (b) is a front view showing a preform that is the preformed body of (a). A third embodiment of the present invention is shown, in which (a) is a partial front view of a synthetic resin bottle, and (b) is a front view of a preform that is the preformed body of (a).

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view of a synthetic resin bottle showing a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line III--III in FIG. indicates an indicator mark consisting of a convex portion.
In the following, a line passing through the center of the bottle in the vertical direction is defined as the container axis O (see FIG. 4(b)), and a direction around the container axis O is defined as the circumferential direction. Further, the mouth side is defined as the upper side, and the bottom side is defined as the lower side.

A synthetic resin bottle 1 (hereinafter simply referred to as "bottle 1") shown in FIG. It has a body part 4 having a shape, a shoulder part 3 formed to have a diameter decreasing upward from the body part 4, and a cylindrical mouth part 2 erected on the shoulder part 3, It is formed by biaxially stretching blow molding a preform 10, which will be described later.
On the outer peripheral surface of the mouth barrel part 2, there is a male screw 6 for screwing a screw cap (not shown) to seal the bottle body 1, and a sealing ring for preventing unauthorized opening is attached to the lower part of the male screw 6. A matching stepped cover 7 and an annular neck ring 8 protrude from the bottom of the cover 7.

Further, an indicator mark M1 is formed in a region near the shoulder portion 3, more specifically, in a region from the lower part of the neck ring 8 to the shoulder portion 3. The indicator mark M1 shown in the first embodiment is formed as a vertical line extending in the vertical direction. In this way, the vertical position of the indicator mark M1 can be formed at the lower part of the mouth tube part 2 or on the body part 4 other than the shoulder part 3, but in order to accurately detect the seaming angle, It is preferable to form the indicator mark M2 on the screw cap side as close as possible to the indicator mark M2 (see FIG. 4).

Further, the indicator mark M1 is provided at a position corresponding to the starting end 6a of the male thread 6 in the circumferential direction. In other words , the indicator mark M1 is provided directly below the starting end 6a of the male thread 6, and indicates the position where the starting end 6a of the male thread 6 is formed in the circumferential direction.

As shown in FIG. 2(a) or FIG. 2(b), the indicator mark M1 is formed of a valley-like concave portion or a mountain-like convex portion that is triangular in cross-sectional view, and is formed of a concave portion or a mountain-like convex portion provided in the thickness direction. The apex Ma of the convex portion indicates the center position of the indicator mark M1 in the width direction (also in the circumferential direction). The width of the indicator mark M1 is preferably wider than the parting line (not shown) formed on the outer peripheral surface of the bottle 1 after blow molding so that it can be distinguished from the parting line (not shown). , more preferably in the range of 0.2 to 5.0 mm.

In addition, the indicator mark M1 may be formed as a concave portion or a convex portion as described above, but the depth dimension of the concave portion or the height dimension of the convex portion after blow molding is determined by By setting the distance within a range of 0.03 to 1.00 mm from the surface, it becomes possible to continue using the bottle 1 without any effect on its function.
By configuring the indicator mark M1 as described above, it becomes possible to easily and reliably distinguish the shape of the indicator mark M1 formed on the bottle 1 after blow molding.

FIG. 3 is a front view showing a preform which is a preform of the synthetic resin bottle shown in FIG.
The preform (preformed body) 1 is formed by injection molding using a synthetic resin material for bottle molding, such as PET (PolyEthylene Terephthalate).
As shown in FIG. 3, the preform 10 is integrally provided with a cylindrical body part 14 connected below a mouth part 12 provided at an upper part, and a bottom part 15 that closes the lower end of this body part 14. This is a test tube shaped member.
The mouth portion 12 has a male thread 16, a coverlet 17, and a neck ring 18 on its outer peripheral surface. The male screw 16 is provided in a helical manner protruding from the outer peripheral surface of the mouth portion 12 toward the outside in the radial direction of the preform 10, and the coverlet 17 is provided in a position below the male screw 16 to protrude circumferentially toward the outside in the radial direction. has been done. Further, the neck ring 18 is annularly protruded at a position below the coverlet 17. Further, at a position below the neck ring 18 and at an upper position of the trunk 14, an indicator mark M1 is formed in the form of a vertically elongated line by a concave or convex portion having a triangular cross-sectional shape. The indicator mark M1 is provided at a circumferential position corresponding to the starting end 16a of the male thread 16 in the circumferential direction.

Then, when the preform 10 having the above structure is set in a predetermined mold and biaxially stretched and blown, a bottle 1 as shown in FIG. 1 is formed. At this time, the mouth part 12 and bottom part 15 of the preform 10 form the mouth part 2 and the bottom part 5 of the bottle 1 after molding, and the body part 14 of the preform 10 forms the shoulder part of the bottle 1 after molding. 3 and a body portion 4 are formed. Further, the male screw 16, turntable 17, and neck ring 18 of the preform 10 become the male screw 6, turntable 7, and neck ring 8 of the bottle 1 after molding.

FIG. 4 is a partial front view of the synthetic resin bottle showing the positional relationship between the screw cap and the mouth barrel, with (a) showing a state in the middle of screwing, and (b) showing a state when screwing is completed.
As shown by the broken line in FIG. 4, the bottle 1 filled with the liquid is sealed by screwing the screw cap 20 onto the male screw 6 of the mouth tube part 2.
The screw cap 20 includes a top wall 21, a peripheral wall 22 hanging down from the outer peripheral edge of the top wall 21, and a sealing ring 23 connected to the lower end of the peripheral wall 22 via a broken piece (not shown). It is integrally formed. A female thread (not shown) is formed on the inner peripheral surface of the peripheral wall 22 to be screwed into the male thread 6 on the bottle body 1 side. Further, the lower end of the sealing ring 23 is formed with a diameter larger than that of the screw cap 20, and can cover the neck ring 8 when the screwing is completed as shown in FIG. 4(b). It is configured as follows.

The screw cap 20 is provided with an indicator mark M2 on the cap side. In this embodiment, the indicator mark M2 on the cap side is formed as a vertical line on the outer peripheral surface of the peripheral wall 22. Note that the indicator mark M2 on the cap side can have various shapes like the indicator mark M1 on the bottle 1 side.
The screw cap 20 is attached to the mouth barrel portion 2 by screwing the female screw of the screw cap 20 onto the male screw 6 on the bottle body 1 side. As shown in FIG. 4(a), in an intermediate state before the screwing is completed, the indicator mark M2 on the cap side is at a position shifted in the circumferential direction with respect to the indicator mark M1 on the bottle body 1 side.

As shown in FIG. 4(b), when the screw cap 20 is further turned to set the screwing completion state (winding completion state), the indicator mark M2 on the cap side is circumferentially relative to the indicator mark M1 on the bottle body 1 side. Match in direction. Therefore, based on the positional relationship in the circumferential direction between the indicator mark M1 on the bottle 1 side and the indicator mark M2 on the cap side, that is, based on the tightening angle around the container axis O, it is possible to determine whether or not capping with the screw cap 20 was properly performed. This makes it possible to easily and reliably determine whether the

Moreover, if the apexes Ma of the indicator mark M1 on the bottle 1 side and the indicator mark M2 on the cap side are used for discrimination, it becomes possible to detect the seaming angle around the container axis O more accurately.

In particular, in the present invention, since the indicator mark M1 on the bottle body 1 side is provided in the area near the shoulder part 3, more specifically in the area from the lower position of the neck ring 8 to the shoulder part 3, the screw cap Even if the neck ring 8 is structurally covered by the screw cap 20, it is possible to easily and reliably determine whether or not capping with the screw cap 20 has been properly performed.

5 shows a second embodiment of the present invention, (a) is a partial front view of a synthetic resin bottle, (b) is a front view of a preform that is the preform of (a), and FIG. A third embodiment of the present invention is shown, in which (a) is a partial front view of a synthetic resin bottle, and (b) is a front view showing a preform that is the preformed body of (a).

The synthetic resin bottles and preforms shown in the second and third examples differ from the first example above in the shape of the indicator mark M1 on the bottle 1 side, and other configurations and effects. Since this embodiment is similar to the first embodiment, the following description will focus on the points that are different from the first embodiment.

As shown in FIGS. 5(a) and 5(b), in the second embodiment, the indicator mark M1 is formed into a triangular shape in plan view. The indicator mark M1 has an upper apex Mb that extends sharply toward the top of the bottle 1 on the mouth barrel 2 side.
On the other hand, as shown in FIGS. 6(a) and 6(b), in the third embodiment, the indicator mark M1 has a diamond shape in plan view. The indicator mark M1 has an upper apex Mb and a lower apex Mc that extend sharply upward on the mouth barrel 2 side and downward on the bottom 15 side, respectively. A vertex Ma (not shown) in the thickness direction is located at a position connecting the vertex Mb on the upper side and the vertex Mc on the lower side.
In addition, in the second and third embodiments, the upper apex Mb provided at the upper position on the mouth barrel part 2 side is extended to the boundary between the mouth barrel part 2 and the shoulder part 3. However, the present invention is not limited to this, and may be configured to extend to a lower position of the neck ring 8.

In the second and third embodiments as well, a screw cap 20 similar to the first embodiment is screwed onto the mouth barrel portion 2, and at this time, in the circumferential direction between the indicator mark M1 on the bottle body 1 side and the indicator mark M2 on the cap side. Based on the positional relationship, that is, the tightening angle around the container axis O, it is possible to easily and reliably determine whether or not capping with the screw cap 20 has been properly performed.

Although the structure of the present invention and its effects have been described above with reference to Examples, the embodiments of the present invention are not limited to the above-mentioned Examples.

In the above embodiment, the indicator mark M1 on the bottle body side is illustrated as a vertical line, an isosceles triangle, or a rhombus. However, the present invention is not limited to the above embodiment, and may be a dot, Other shapes are also possible.

In the above embodiment, a case has been described in which the indicator mark M2 on the cap side is formed on the peripheral wall 22 of the screw cap 20, but it may be formed on the top wall 21.

Furthermore, the shape of the indicator mark M2 on the cap side may also be a point, a vertically long line, an isosceles triangle, or a rhombus, as in the case of the bottle 1 side.

The present invention can be applied to a wider range of applications in the field of synthetic resin bottles and preforms.

1: Synthetic resin bottle (bottle)
2: Mouth tube part 3: Shoulder part 4: Body part 5: Bottom part 6: Male thread 6a: Starting end of male thread 7: Cover 8: Neck ring 10: Preform 12: Mouth part 14: Body part 15: Bottom part 16: Male thread 17: Turnip 18: Neck ring 20: Screw cap 21: Top wall 22: Peripheral wall 23: Sealing ring M1: Indicator mark M2 on the bottle side: Indicator mark Ma on the cap side: Vertex Mb of the indicator mark in the thickness direction: Upper vertex Mc of indicator mark: Lower vertex O of indicator mark: Container axis

Claims (8)

A shoulder (3) connected to the bottom (5) via the body (4), a mouth tube (2) erected on the shoulder (3), and the mouth tube. A synthetic resin bottle comprising a male thread (6) formed in a portion (2) and an annular neck ring (8) projecting outward,
An indicator mark (M1) whose formation position in the circumferential direction corresponds to the start end (6a) of the male screw (6) is provided near the shoulder (3) from the lower position of the neck ring (8) to the shoulder. The parting line is formed vertically in the region extending to the part (3) and has a width larger than the parting line formed on the outer peripheral surface of the bottle (1) after blow molding. A synthetic resin bottle body characterized by: The synthetic resin bottle according to claim 1 , wherein the indicator mark (M1) is formed in the form of a dot, a vertical line, a triangle, or a diamond. The synthetic resin bottle according to claim 1 or 2 , wherein the indicator mark (M1) has a width dimension of 0.2 to 5.0 mm. The indicator mark (M1) is formed of a concave part or a convex part, and the depth dimension of the concave part or the height dimension of the convex part is set in the range of 0.03 to 1.00 mm from the surface of the bottle (1). The synthetic resin bottle according to any one of claims 1 to 3 . The synthetic resin bottle according to any one of claims 1 to 4 , wherein the indicator mark (M1) is formed in a triangular shape in cross-section with the center position in the width direction as the apex (Ma) in the thickness direction. A cylindrical body (14) has an opening (12) at the upper end thereof, and is formed into a synthetic resin bottle (1) having a predetermined shape according to any one of claims 1 to 5 by biaxial stretch blow molding. A preform characterized by: 7. The preform according to claim 6 , wherein the indicator mark (M1) is formed by a dot, a vertical line, a triangle or a diamond. The preform according to claim 6 or 7 , wherein the indicator mark (M1) is formed in a triangular shape in cross-section with the center position in the width direction as the apex (Ma) in the thickness direction.

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