JP4753315B2 - Caps and bottles - Google Patents

Description

  The present invention relates to a cap for sealing a mouth of a beverage bottle or the like, and a bottle to which the cap is attached.

  Conventionally, in a cap that is attached to a cap portion of a metal bottle such as steel or aluminum alloy, for example, in Patent Document 1, the internal pressure is increased when the internal pressure rises due to decay or fermentation of the contents after being once opened. A slit-like weakened portion that releases gas is formed near the upper end of the cap. In this so-called cap having an explosion-proof function, when the internal pressure rises above a predetermined level, the weakened portion breaks and the internal gas is discharged to the outside, thereby reducing the internal pressure and preventing the container (bottle) from rupturing. . In the cap described in Patent Document 1, a non-nar part is provided at the same height as a knurled recess having a knurled part exhaust hole that is a weakened part, and the non-nar part exhaust hole that is a weakened part also has a non-nar part exhaust hole. Is formed.

Japanese Patent No. 3723200

The following problems remain in the conventional technology.
In the conventional cap described in Patent Document 1, non-nar part exhaust holes are formed at the same height as the knar part exhaust holes. Thus, when the non-nar part exhaust hole which is a weakened part is also formed in the same height position as the nal part exhaust hole which is a weakened part, the intensity | strength of the weakened part vicinity falls over the circumferential direction. In addition, if a weakened part such as a non-Nar part exhaust hole is formed on the upper end side of the cap with respect to the knurled part in which the knurled part exhaust hole is formed, the strength from the upper edge of the cap to the weakened part is also reduced End up. In such a case, when a drop impact is applied to the upper edge of the cap when the bottle is dropped, the sealing performance is lowered due to the deformation of the weakened portion in the vicinity of the upper edge of the cap, and it is easy to leak from the weakened portion. There is a fear. Further, the weakened part is deformed together with the upper end edge of the cap due to the drawing process at the time of capping, and the assumed internal pressure release value may vary. Furthermore, the weakened portion is deformed by the drawing process at the time of capping, which causes a problem that the surface pressure of the seal portion becomes uneven and the opening torque is increased.
Further, the above-described deformation causes the cut portion of the weakened portion to protrude outward in the radial direction, and there is a disadvantage that the user feels uncomfortable when gripping the cap. Furthermore, since the cut portion of the weakened portion protrudes outward in the radial direction, the contents may blow out when the internal pressure is released when the plug is opened.

  The present invention has been made in view of the above-described problems, and ensures a suitable drop strength, and further suppresses deformation of the weakened portion at the time of capping and suppresses variations in internal pressure release values and the like, and It aims at providing the bottle which attached this.

  The present invention employs the following configuration in order to solve the above problems. That is, the cap of the present invention is a cap that includes a top surface portion disposed above and a cylindrical portion that is substantially suspended from the periphery of the top surface portion, and seals the mouth of the bottle. A plurality of knurl recesses formed near the top surface portion and excluding some non-formation regions in the circumferential direction, and a linear first weakening portion that is formed in the knurl recesses and releases internal pressure when opened. And a linear second weakened portion that is formed in the non-formation region and is arranged below the first weakened portion and opens when a predetermined internal pressure is reached with the mouth of the bottle sealed. It is characterized by having.

  In this cap, the second weakened portion that opens when a predetermined internal pressure is reached at the time of sealing is arranged below the first weakened portion, the height positions are different from each other, and the second weakened portion and the upper end of the cap are arranged. A sufficient space for absorbing the drop impact can be secured between the edge portion and appropriate drop strength and sealing performance can be obtained. Further, by lowering the position of the second weakened portion, it becomes easier to obtain uniform drawing, and the inconvenience that the opening torque increases is improved. Furthermore, the second weakened portion does not protrude outward in the radial direction, and the blowout of the contents at the time of opening can be suppressed.

  Further, the cap of the present invention is characterized in that the second weakening portion is divided into a plurality of portions and spaced apart from each other and arranged in the circumferential direction. That is, in this cap, since it has the 2nd weakened part divided | segmented into plurality and spaced apart from each other and arranged in the circumferential direction, a bridge-shaped reinforcing part is formed between the divided and adjacent second weakened parts Thus, as compared with a case where the second weakened portion is simply a single long slit, the second weakened portion as a whole is less likely to be deformed during capping and a more stable drop strength can be obtained.

  Furthermore, the cap of the present invention is formed of aluminum or an aluminum alloy, and the second weakened portion is spaced downwardly within a range of 0.5 mm to 2.0 mm from the knurl slit. To do. That is, this cap is made of a metal such as aluminum or aluminum alloy, and the second weakened portion is spaced downward from the nar slit within the above numerical range. As a result, the stress received by the second weakened portion is reduced, and the occurrence of deformation or the like can be prevented. Thereby, while suppressing the dispersion | variation in the internal pressure release value by a deformation | transformation, the discomfort of the user at the time of opening can also be eliminated.

  Moreover, the cap of the present invention is characterized in that an upper opening end portion of the second weakening portion is bent toward the inside of the cylindrical portion. That is, in this cap, the upper opening end of the second weakened portion is bent toward the inside of the cylindrical portion, so that high rigidity is achieved by bending, and uniform drawing is obtained during capping. As a result, deformation of the second weakening portion is suppressed, and variation in the internal pressure release value is improved. Moreover, since the edge part of the upper opening edge part of a 2nd weakening part is located facing inward, the discomfort of the hand in a plug opening operation | movement is also reduced.

  In the cap of the present invention, the upper opening end of the second weakening portion is bent at an angle of 10 ° to 25 ° with respect to a virtual line parallel to the axis of the cylindrical portion. And That is, in this cap, the upper opening end portion of the second weakening portion is bent at an angle of 10 ° to 25 ° with respect to a virtual line parallel to the axis of the cylindrical portion. As described above, it is possible to obtain a good shape rigidity and a stable internal pressure release value, and it is possible to greatly improve the reduction of the uncomfortable feeling of the hand. It has been confirmed that when the angle exceeds 25 °, the bending becomes too tight and the processing becomes unstable and the variation in the internal pressure release value increases. Moreover, if the said angle is less than 10 degrees, the shape rigidity by bending cannot be obtained sufficiently and the improvement effect is not sufficient.

The bottle of the present invention includes a bottle main body and a cap attached to the mouth of the bottle main body, and the cap is the cap of the present invention.
In this bottle, since the cap of the present invention is attached to the mouth of the bottle body, the bottle has an appropriate drop strength and high handleability.

The present invention has the following effects.
That is, according to the cap and the bottle according to the present invention, the second weakened portion that opens when the predetermined internal pressure is reached during sealing is arranged below the first weakened portion, the height positions are different from each other, and A sufficient space to absorb the drop impact can be secured between the weakened portion of 2 and the upper edge of the cap, so that strength can be secured in the vicinity of the weakened portion to obtain appropriate drop strength and sealability. Can do. Therefore, stable capping is possible, and it is possible to have a high handleability of the bottle.

  Hereinafter, an embodiment of a cap and a bottle according to the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, the cap 1 according to the present embodiment is attached to a cap portion (mouth portion) 3 of an aluminum or aluminum alloy (metal) bottle body 2 having a diameter of 38 mm and sealed tightly. It becomes a pilfer proof cap (hereinafter also referred to as a PP cap). The cap 1 is formed by molding aluminum or an aluminum alloy plate into a cup shape, and includes a top surface portion 4 disposed above and a cylindrical portion 5 that is substantially suspended from the periphery of the top surface portion 4.

The cylindrical part 5 has a cylinder upper part 7 and a cylinder lower part 8 which are divided vertically through slits 6 formed intermittently in the circumferential direction, and a plurality of bridges 6 a formed between adjacent slits 6. Thus, the cylinder upper part 7 and the cylinder lower part 8 are connected to each other.
As shown in FIG. 2, the cap part 3 of the bottle body 2 to which the cap 1 is attached is formed with a screw thread 3a and a bulging part 3b, and the cap 1 put on the cap part 1 has a screw thread 3a. Then, it is plastically deformed so as to follow the shape of the bulging portion 3b and the like. As a result, the cap 1 is attached to the base portion 3 as the PP cap 10 and the bottle body 2 is sealed, whereby the bottle 100 is obtained.

The cylindrical portion 5 is near the top surface portion 4 and is formed with a plurality of knurl recesses 12 arranged in the circumferential direction excluding a part of the non-formed region 11 and the knurl recesses 12 are formed to release the internal pressure when the cap is opened. A predetermined internal pressure in a state in which the knurl slit (linear first weakened portion) 12a and the non-formation region 11 are disposed below the knurl slit 12a and the cap portion 3 of the bottle body 2 is sealed. It has a weakening line (linear second weakening portion) 13a that opens when it becomes (for example, 6 kgf / cm ² ).

The knurled recess 12 increases the frictional resistance between the PP cap 10 and the finger to be gripped when the cap is opened, thereby enabling easy opening without sliding the hand.
The knurl slit 12 a is formed at the upper end of the knurl recess 12 in the circumferential direction so as to have the same length as the width of the knurl recess 12. The knurl slit 12a is a vent hole for releasing the gas in the bottle body 2 to the outside when the PP cap 10 is rotated upward while breaking the bridge 6a.

The weakening line 13a is a recess that is smaller than the knurled recess 12 in the non-formation region 11 and has the same length as the width of the split recess 13 at the lower end of the plurality of split recesses 13 that are spaced apart from each other in the circumferential direction It is formed in the circumferential direction. That is, the plurality of weakening lines 13a constitutes a slit connected by a bridge between the divided concave portions 13 (a bridge between the weakening lines 13a) as a whole. The height position interval a between the weakening line 13a and the knurl slit 12a is set within a range of 0.5 mm to 2.0 mm.
This weakening line 13a opens at a predetermined internal pressure release value (for example, 6 kgf / cm ² ) and releases the internal gas when the internal pressure of the bottle body 2 rises excessively due to the content being fermented or the like. It plays a role of so-called explosion-proof function.

  Next, the PP cap 10 in which the cap 1 is attached to the base 3 and the bottle 100 sealed with the PP cap 10 will be described with reference to FIG.

  The bottle 100 of the present embodiment includes a bottle body 2 made of aluminum or an aluminum alloy and filled with a liquid such as a beverage, and a PP cap 10 (cap 1) attached to the cap portion 3 of the bottle body 2. Yes. The PP cap 10 forms a threaded portion 14 along the outer shape of the thread 3a on the upper portion 7 of the cylinder, and forms a pill fur proof portion 15 along the lower portion of the bulging portion 3b on the lower portion 8 of the bottle. It is attached to the base part 3. A liner 16 is provided inside the top surface 4 of the PP cap 10, and the opening of the bottle body 2 is sealed by the liner 16.

  When the bottle main body 2 is rotated to open the PP cap 10, the cylinder upper portion 7 on which the screw portion 14 is formed rotates while being lifted upward along the thread 3 a of the bottle main body 2. On the other hand, the cylinder lower part 8 in which the pilfer proof part 15 is formed is locked to the bulging part 3b of the bottle main body 2, and rotates without being lifted together with the cylinder upper part 7.

  At this time, each bridge 6a to which an upward pulling force and a circumferential pulling force (frictional force) are applied is sequentially and independently broken. And when all the bridge | bridging 6a fractures | ruptures, the cylinder upper part 7 and the cylinder lower part 8 of PP cap 10 are parted. Thereafter, the cylinder upper part 7 of the PP cap 10 can be detached from the bottle body 2 and opened by further rotating the cylinder upper part 7 with respect to the thread 3a. On the other hand, the cylindrical lower portion 8 of the PP cap 10 is left on the bottle body 2 side as a ring-shaped pilfer proof portion 15.

Further, when the bottle body 2 thus sealed with the PP cap 10 (cap 1) is opened for the first time, the gas in the bottle body 2 passes between the liner 16 inside the top surface portion 4 and the base portion 3. It is discharged to the outside from the opened knurl slit 12a.
Furthermore, when the PP cap 10 is once opened and the contents come into contact with the atmosphere, and the contents ferment when exposed to a high temperature for a long time in that state, and the internal pressure of the bottle body 2 rises excessively, The weakening line 13a opens at a predetermined internal pressure release value, releases the internal gas, and releases the internal pressure. As a result, cap jumping or the like due to an abnormal increase in can internal pressure can be prevented.

  As described above, in the present embodiment, the weakening line 13a that breaks when a predetermined internal pressure is exceeded at the time of sealing is arranged below the knurl slit 12a, the height positions are different from each other, and the weakening line 13a and the PP cap 10 upper end edge Since a sufficient space for absorbing the drop impact can be secured between the two portions, appropriate drop strength and sealability can be obtained. Moreover, by lowering the position of the weakening line 13a, it becomes easy to obtain uniform drawing, and the inconvenience that the opening torque increases is improved. Furthermore, since the weakening line 13a does not protrude outward in the radial direction and the upper end of the cut portion of the weakening line 13a is processed inward, it is possible to suppress the content from being blown out during opening.

  Moreover, since it has the some weakening line 13a spaced apart and circumferentially arranged, between the adjacent weakening lines 13a becomes a bridge-shaped reinforcement part, and the weakening line 13a is made into only one long slit. Compared to the case, the weakening line 13a as a whole is less likely to be deformed during capping, and more stable drop strength can be obtained.

  Further, since the weakening line 13a is spaced below the knurl slit 12a within the above numerical range, the stress received by the weakening line 13a due to drawing processing during capping is reduced and deformed, as shown in the examples described later. Can be prevented. Thereby, while suppressing the dispersion | variation in the internal pressure release value by a deformation | transformation, the discomfort of the user at the time of opening can also be eliminated.

  Next, 2nd Embodiment of the cap based on this invention is described below with reference to FIG.3 and FIG.4. Note that, in the following description of the embodiment, the same components described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, the weakening lines 13a are formed at the lower end portion of the divided recesses 13 that are provided apart from each other in the non-forming region 11 in the circumferential direction. The cap (pill fur proof cap) 21 of the second embodiment is formed in the circumferential direction with the same length as the width of the divided recess 13, but in the non-formation region 11 as shown in FIG. One long slit type weakening line (second weakening portion) 23a is formed.

Moreover, in the cap 21 of 2nd Embodiment, as shown in FIG. 4, the upper opening end part 24 of the weakening line 23a is bent and formed toward the inward of the cylindrical part 5. As shown in FIG.
In particular, the upper opening end 24 of the weakening line 23 a is bent at an angle b from 10 ° to 25 ° with respect to a virtual line K parallel to the axis of the cylindrical portion 5.

  As described above, in the cap 21 of the second embodiment, the upper opening end 24 of the weakening line 23a is bent inward of the cylindrical portion 5, so that high rigidity is achieved by bending, and even when capping is performed. Can be obtained. As a result, deformation of the weakening line 23a is suppressed, and variation in the internal pressure release value is improved. Moreover, since the edge part of the upper opening end part 24 of the weakening line 23a is located facing inward, the discomfort of the hand in the opening operation is reduced.

  Further, since the upper opening end portion 24 of the weakening line 23a is bent at an angle b from 10 ° to 25 ° with respect to the virtual line K parallel to the axis of the cylindrical portion 5, good shape rigidity and stable internal pressure are obtained. An open value can be obtained, and the reduction of hand discomfort can be greatly improved. It has been confirmed that when the angle b exceeds 25 °, the bending becomes too tight and the processing becomes unstable and the variation in the internal pressure release value increases. On the other hand, if the angle b is less than 10 °, the shape rigidity by bending cannot be sufficiently obtained, and the improvement effect is not sufficient.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, the present invention is suitable for caps made of aluminum or aluminum alloy as described above, but may be applied to caps made of resin.

<First embodiment>
Next, as a first embodiment, using the cap 1 and the bottle body 2 according to the present invention, the distance of the height position from the knurl slit 12a to the lower weakening line 13a (weakening line processing position (unit: mm)). A plurality of samples were prepared by stepwise changing between 0 and 2.5 mm, and the internal pressure release value and the drop strength were actually measured and evaluated.
In addition, the weakening line 13a of the sample used for evaluation made all the bridge width 0.3mm between weakening lines 13a, the number of bridges, and the total length 14mm.

In addition, the evaluation of the internal pressure release value was performed by measuring the value (unit: kgf / cm ² ) when the internal pressure was released from the weakening line 13a by pressurizing from the bottom of the bottle body 2 at ² kgf / cm ^2. (ave) and standard deviation (σ) were calculated.
Furthermore, the drop strength was evaluated under the following conditions. First, the cap 1 (PP cap 10) side is placed down on a metal plate inclined at 10 ° from a specified height (in this embodiment, 30 cm and 40 cm) with the capped bottle body 2. Drop it. Then, when the bottle main body 2 was stored for 24 hours in an upright state, the weight was measured, and compared with the weight measured before dropping, it was evaluated by confirming whether or not leakage occurred. In addition, 20 drop strengths were evaluated for each.
The evaluation results are shown in Table 1 below.

  As can be seen from this table, when the weakening line processing position a is 0 mm, that is, when the position of the weakening line 13a coincides with the height position of the knurl slit 12a, the evaluation of the drop strength is the worst in both 30 cm and 40 cm. On the other hand, the evaluation of the drop strength is improved as the weakening line processing position a becomes larger, that is, as the weakening line 13a is separated downward from the knurl slit 12a. In particular, when the weakening line processing position a is 0.5 mm or more, the evaluation of the drop strength shows no leakage in both cases of 30 cm and 40 cm.

  Regarding the evaluation of the internal pressure release value, the variation (standard deviation σ) of the internal pressure release value is lower than the weakening line machining position 0 mm until the weakening line machining position a is 2.0 mm. In particular, the weakening line processing position is reduced to about half of the variation in the case of the weakening line processing position 0 mm within the range of 0.5 to 2.0 mm. In addition, although the fluctuation | variation becomes large again when the weakening line processing position a is 2.5 mm, this is because the weakening line 13a is lowered too much from the knurl slit 12a, and the internal pressure is released due to the influence of screw processing at the time of capping. This is probably because the dispersion of values has become large. Therefore, it is preferable that the weakening line 13a is separated downward within a range of 0.5 to 2.0 mm from the height position of the knurl slit 12a as described above.

<Second embodiment>
Next, as a second example, the results of performing the above evaluation in the same manner when a long slit type weakening line is employed will be described. That is, in the first embodiment, the weakening line 13a that is divided into a plurality of parts via the bridge is adopted, but in the second embodiment, the bridge is not used and one long linear weakening line as a whole. Is adopted.
Since the weakening line 13a of the first embodiment is a slit connected by a plurality of bridges, when the internal pressure is abnormal, the opening expands due to the breakage of the bridge and the internal pressure is released. In the slit type weakening line, since it is one long slit, the internal pressure is released by opening the slit up and down by the internal pressure. In addition, the weakening line in 2nd Example was made into the long slit of length 12mm.
The evaluation results in this second example are shown in Table 2 below.

  Also in this second example, when the weakening line processing position is 0 mm, the drop strength evaluation is the worst result of both 30 cm and 40 cm, whereas the larger the weakening line processing position, the lower the drop strength. The evaluation of is getting better. In particular, when the weakening line processing position is 0.5 mm or more, the evaluation of the drop strength shows no leakage at both 30 cm and 40 cm. In addition, when the weakening line processing position a in the first embodiment is 0 mm and 0.2 mm, the drop strength is better evaluated than the similar case in the second embodiment. In contrast to the long slit type of the book, in the first embodiment, it is considered that the weakening line 13a is divided into a plurality of parts and is reinforced by a bridge.

Regarding the evaluation of the internal pressure release value, the variation (standard deviation σ) of the internal pressure release value is reduced as compared with the weak line processing position 0 mm until the weak line processing position a is 2.5 mm. In particular, the weakening line machining position is reduced to a variation of about 40% or less with respect to the case where the weakening line machining position is 0 mm within the range of 0.5 to 2.0 mm. Therefore, similarly to the first embodiment, in the second embodiment, the weakening line is preferably spaced downward within the range of 0.5 to 2.0 mm from the height position of the nar slit 12a as described above.
As shown in the first embodiment and the second embodiment, the present invention is effective when the weakening line is a perforation type having a bridge (a weakening line 13a divided into a plurality of pieces) or a single long slit type. I know that there is.

<Third embodiment>
Next, as a third embodiment, when the weakening line 23a is bent inward, the bending angle b of the weakening line 23a is bent stepwise from 0 to 35 ° at intervals of 5 °, and the internal pressure release value is evaluated respectively. (Same conditions as above) and results of grip sensory evaluation will be described.

In the third embodiment, the processing position of the weakening line 23a is spaced downward by 1.0 mm from the height position of the knurl slit 12a. The weakening line 23a is a long slit type having a length of 12 mm.
In the grip sensory evaluation, whether or not the hand feels uncomfortable at the time of opening is determined in five stages, and the smaller the number, the less the uncomfortable feeling. The number of samples was 20. The evaluation results in the third example are shown in Table 3 below.

  As can be seen from this result, by bending the upper opening end 24 of the weakening line 23a inward, the variation in the internal pressure release value was reduced, and the discomfort of the hand at the time of opening was reduced. From this result, it is desirable that the angle b at which the upper opening end 24 of the weakening line 23a is bent inward is set to 10 ° to 25 °. That is, if it is 10 ° or less, the shape rigidity by bending cannot be sufficiently obtained, and the improvement effect is not sufficient. Further, it can be seen that when the angle is 25 ° or more, the bending becomes too tight, the processing becomes unstable, and the variation in the internal pressure release value increases.

It is a perspective view showing a cap in a 1st embodiment of a cap and a bottle concerning the present invention. In 1st Embodiment, it is a figure which compares and shows the AA line cross section of FIG. 1 in a capping state, and the BB line cross section. In 2nd Embodiment of the cap and bottle which concern on this invention, it is a perspective view which shows a cap. In 2nd Embodiment, it is the CC sectional view taken on the line of FIG. 3 in the capping state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 21 ... Cap for pill fur proof, 2 ... Bottle main body, 3 ... Cap part (mouth part), 3a ... Screw thread, 3b ... Swelling part, 4 ... Top surface part, 5 ... Cylindrical part, 6a ... Bridge, 7 ... Cylinder upper part, 8 ... Cylinder lower part, 10 ... PP cap, 12 ... Nar recess, 12a ... Nar slit (first weakening part), 13a ... Weakening line (second weakening part), 14 ... Screw part, 15 ... Pilfer proof part, 23a ... weakening line (second weakening part), 24 ... upper opening end of weakening line, 100 ... bottle

Claims (6)

A cap for sealing a bottle mouth, comprising a top surface portion disposed above and a cylindrical portion substantially suspended from the periphery of the top surface portion,
The cylindrical part is near the top surface part and a plurality of knurl recesses formed side by side in the circumferential direction excluding a part of the non-forming area;
A linear first weakened portion that is formed in the knurl recess and opens the internal pressure when the cap is opened;
A linear second weakening portion that is formed in the non-formation region and is arranged below the first weakening portion and opens when a predetermined internal pressure is reached with the mouth of the bottle sealed. A cap characterized by having. The cap according to claim 1,
The cap, wherein the second weakening portion is divided into a plurality of portions and is spaced apart from each other and arranged in the circumferential direction. The cap according to claim 2,
Formed of aluminum or aluminum alloy,
The cap, wherein the second weakened portion is spaced downwardly within a range of 0.5 mm to 2.0 mm from the first weakened portion. The cap according to any one of claims 1 to 3,
An upper opening end portion of the second weakening portion is bent toward the inside of the cylindrical portion. The cap according to claim 4,
An upper opening end portion of the second weakening portion is bent at an angle of 10 ° to 25 ° with respect to an imaginary line parallel to the axis of the cylindrical portion. A bottle body, and a cap attached to the mouth of the bottle body,
The said cap is a cap as described in any one of Claim 1 to 4, The bottle characterized by the above-mentioned.

Images