JP5644029B2 - Plastic bottles and plastic bottles with beverages - Google Patents

Description

  The present invention relates to a resin bottle such as a so-called PET (polyethylene terephthalate) bottle and a beverage-containing resin bottle filled with a beverage.

In this type of resin bottle containing beverage, the inside of the bottle is depressurized due to the permeation of the content liquid over time, and the bottle body may be deformed into an oval shape. When such bottle deformation occurs, when selling with a vending machine, there is a multiple bottle phenomenon in which a plurality of bottles are discharged at once by passing through the stopper holding the bottle with beverage in the vending machine. May occur.
On the other hand, in order to prevent deformation of the bottle due to reduced pressure, Patent Document 1 discloses that a reduced pressure absorption panel is provided on the bottle body.

JP 2003-111942 A

However, since the resin bottle provided with the reduced pressure absorption panel increases the amount of the resin material used and has a low buckling strength, it is weak to stand up (stacked up and down) and may be buckled.
On the other hand, in recent years, bottles have been actively reduced in weight for the purpose of reducing costs by reducing environmental loads and reducing the amount of resin.
Some bottles have a circumferential groove to reduce the weight of the bottle. However, as described in the background art, this type of bottle has an elliptical deformation when the bottle is depressurized. There is an inconvenience that it is easy to do.

  Accordingly, the present invention provides a resin bottle and beverage that can reduce weight by reducing the amount of resin material used, and has high buckling strength and can prevent oval deformation of the trunk when decompression occurs inside the bottle. The purpose is to provide bottles made of plastic.

According to the first aspect of the present invention, the body portion is formed with a plurality of transverse grooves continuous in the circumferential direction in the upper and lower portions, and formed below the upper transverse groove portion, and the entire circumferential surface is formed in a drum shape. Is a curved concave portion consisting only of a surface recessed inwardly in an arc shape in the vertical direction, and a lower horizontal groove portion formed below the curved concave portion and forming a lateral groove continuous in the circumferential direction between the curved concave portion and the bottom portion. The curved concave portion is a resin bottle that is deformed when the inside of the bottle is depressurized .

According to a second aspect of the present invention, in the first aspect of the present invention, the curved recess is formed in a region where the vertical dimension is 20% to 40% with respect to the height from the bottom to the neck ring. It is characterized by that.

The invention according to claim 3 is the invention according to claim 2 , wherein the curved recess has a maximum recess dimension of 70% to 90% with respect to the maximum outer diameter of the body portion.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the curved concave portion is composed of two circular arcs that are vertically continuous, and the upper arc is more than the lower arc. The arc diameter is reduced.

The invention according to claim 5 is the invention according to claim 4 , wherein the diameter of the upper arc is 7 to 20% of the diameter of the lower arc.

Invention of Claim 6 is the resin bottle containing a drink which filled the drink in the resin bottle as described in any one of Claims 1-5 .

According to the first aspect of the present invention, when the inside of the container is decompressed, the curved concave portion is deformed by the configuration including the upper horizontal groove portion and the hourglass-shaped curved concave portion. Makes an even deformation of the target shape.
Since only the curved recess is deformed, the outer diameter of the upper horizontal groove (maximum outer diameter of the body) is not affected, and even when sold by a vending machine, the entire body is elliptically deformed as before. As a result, the maximum outer diameter of the body portion does not change, so that a multiple occurrence phenomenon can be prevented.
In addition, since a conventional decompression panel is not provided, the amount of resin material used can be reduced to reduce the weight, and the buckling strength can be increased.

Since the lateral groove portions are formed on the upper and lower sides of the curved concave portion, the buckling strength can be further increased and the weight can be reduced.

According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the upper and lower dimensions of the curved recess are 20 to 40% of the height from the bottom to the neck ring. In the case of the above range, the curved concave portion can be easily deformed when a reduced pressure is generated in the resin bottle, so that the reduced pressure absorption is excellent. If it is less than 20%, the curved concave portion is difficult to deform with respect to the reduced pressure, and if it is more than 40%, the buckling strength is lowered and there is a possibility that it cannot be stacked.

According to the invention described in claim 3 , the same effect as that of the invention described in claim 2 can be obtained, and the curved recess has a maximum recess size of 70% to 90% with respect to the maximum outer diameter of the body portion. Therefore, even if the curved concave portion is deformed when the pressure is reduced in the resin bottle, there is little influence on the maximum outer diameter and the buckling strength can be prevented from being lowered. If the maximum dent size is larger than 90% of the maximum outer diameter of the body, there is a risk of projecting from the maximum outer diameter of the body due to deformation, and if it is less than 70%, the buckling strength is significantly reduced. It is.

According to the invention described in claim 4 , the same effect as in the invention described in any one of claims 1 to 3 can be obtained, and the upper arc diameter can be made smaller than the lower arc diameter. When having a bottle made, it is easy to hold a resin bottle because it can be easily put on the lower end of the upper horizontal groove when a finger is put on the upper arc portion, and therefore it can be held easily. In particular, when the finger is slid from the lower arc portion and moved to the upper arc portion, the finger is easily applied to the upper horizontal groove portion.

According to the fifth aspect of the present invention, the same effect as that of the fourth aspect of the invention can be obtained, and the arc diameter of the upper arc portion is an arc diameter close to the thickness of the finger. Fingers are easy to fit in the section, and it is easier to hold a resin bottle when drinking a filled beverage.

According to invention of Claim 6 , the resin-made bottle with a drink which can acquire the effect as described in any one of Claims 1-5 can be provided.

It is a front view of the resin-made bottle concerning embodiment of this invention. In the resin bottle shown in FIG. 1, it is a front view of the resin bottle which shows a state when decompression arises in the bottle. FIG. 3 is a sectional view showing the longitudinal section of FIG. 2 in half. It is a front view explaining the measuring method of the intensity | strength by a buckling strength test. (A) is a front view explaining the measuring method of the intensity | strength by a lateral compression strength test, (b) is a side view of the bottle which shows a measurement position. 2 is a front view of a resin bottle according to Comparative Example Product 1. FIG. 6 is a front view of a resin bottle according to Comparative Example Product 2. FIG.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The resin bottle 1 according to the first embodiment is a bottle with a beverage filling capacity of 500 ml and is a PET bottle for aseptic filling (normal temperature filling), but is a heat resistant resin bottle for hot pack filling (heat sterilization filling). It may be.
The resin bottle 1 includes a bottom part 3, a body part 5, a shoulder part 7, and a mouth part 9. The mouth 9 is located on the neck ring 6. Reference numeral 10 denotes a cap.

The body portion 5 is provided with an upper horizontal groove portion 11, a curved concave portion 13 positioned below the upper horizontal groove portion 11, and a lower horizontal groove portion 15 positioned below the curved concave portion 13.
In the upper horizontal groove portion 11, a plurality of horizontal grooves 14 that are continuous in the circumferential direction of the body portion 5 are formed vertically with a predetermined interval E, and in this embodiment, three horizontal grooves 14 are formed. The predetermined interval E is about 9 mm, and this portion is a band-shaped ring 12.
Between the upper horizontal groove part 11 and the curved recessed part 13, it is the largest outer diameter part 20 of the trunk | drum 5, and the largest outer diameter G is 67.5 mm.

The curved recess 13 has a drum shape, and the entire circumferential surface is recessed in an arc shape inward of the bottle in the vertical direction. The curved concave portion 13 is formed in an area of 20% to 40% with respect to the height H from the bottom of the entire body portion to the neck ring, and is about 30% in the present embodiment. The height H is 184.57 mm, and the vertical dimension J of the curved recess 13 is 56 mm.
The curved recess 13 has an outer diameter at the maximum recess position 17 of 70% to 90% with respect to the maximum outer diameter G of the body portion. The outer diameter F of the curved recess 13 at the maximum recess position 17 is 53 mm.

The curved concave portion 13 is composed of two circular arc portions that are continuous in the vertical direction, and the arc diameter R1 of the upper arc portion 23 is smaller than the lower arc diameter R2 of the lower arc portion 25. The upper arc diameter R1 is 7 to 20% of the lower arc diameter R2. In the present embodiment, the upper arc diameter R1 is 14.14 mm, and the lower arc diameter R2 is 111.56 mm.
The maximum dent position 17 is a boundary between the upper arc portion 23 and the lower arc portion 25.

Similarly to the upper horizontal groove portion 11, the lower horizontal groove portion 15 is formed with a horizontal groove 14 that is continuous in the circumferential direction of the body portion 5 with a predetermined interval E between the upper and lower sides, and two lower grooves are formed in this embodiment. The predetermined interval E is about 9 mm, similar to the upper lateral groove. The portion of the predetermined interval E is the maximum outer diameter portion 22 of the trunk portion 5, and the maximum outer diameter G is the same dimension G as that of the upper maximum outer diameter portion 20.
The bottom 3 is formed with a plurality of grooves 19 radially from the center of the bottom in the radial direction.
The resin bottle 1 according to the present embodiment has a wall thickness of about 0.20 and a weight of about 18 g.

Next, the effect of the resin bottle 1 concerning this Embodiment is demonstrated.
When an experiment was performed in which the resin bottle 1 according to the present embodiment was decompressed, only the curved concave portion 13 was deformed, but the curved concave portion 13 had four dents 21 of uniform shape. In the decompression experiment, 10 ml of the content liquid (beverage) was withdrawn and decompressed. FIG. 2 shows the outer shape of the resin bottle 1 when the pressure is reduced, and FIG. 3 shows a cross-section in this state. As is apparent from FIGS. 2 and 3, the depression 21 formed by the pressure reduction is shown. Are uniformly formed around the trunk in the curved portion 13 and look like a pattern. Therefore, even if decompression occurs in the resin bottle, the outer appearance is good because there is no elliptical deformation or extreme depression in the body 5 of the resin bottle as in the prior art. In particular, it does not cause general consumers to imagine product defects.

  That is, according to the resin bottle 1 according to the present embodiment, since the curved recess 13 is a drum-shaped arc surface, the internal pressure can uniformly act on the entire outer peripheral surface of the curved recess 13. Appropriate deformation of the shape can be performed.

Since the curved concave portion 13 absorbs the reduced pressure by deformation, deformation of other portions, that is, the upper horizontal groove portion 11 and the lower horizontal groove portion 13 can be prevented. Therefore, since the portion where the maximum outer diameter G of the resin bottle 1 is formed is not deformed even if the pressure is reduced, the multiple occurrence phenomenon that has conventionally occurred in vending machines can be prevented.
In addition, according to the resin bottle 1 according to the present embodiment, since a conventional decompression panel is not provided, the amount of resin material used can be reduced, the weight can be reduced, and the buckling strength can be increased. .

  Since the upper lateral groove portion 11 and the lower lateral groove portion 15 are formed in the body portion 5 so as to sandwich the curved concave portion 13, it is possible to further increase the buckling strength, to withstand upper stacking and to reduce the weight. it can.

In the curved recess 13, the upper arc portion 23 is smaller than the lower arc portion 25. Therefore, when the resin bottle 1 is held, a finger is placed on the upper arc portion 23 and the lower end portion of the upper horizontal groove portion 11 (maximum It is easy to put a finger on the outer diameter portion 20) and to hold a resin bottle. In particular, when the finger is slid from the lower arc portion 25 and moved to the upper arc portion 23, the finger is easily applied to the lower surface of the maximum outer diameter portion 20.
Since the arc diameter of the upper arc portion 23 is 7 to 20% of the arc diameter of the lower arc portion, the arc diameter R1 of the upper arc portion 23 is an arc diameter close to the thickness of the finger. This makes it easy to hold the resin bottle even when the weight of the resin bottle is high when drinking a filled beverage.

  Since the lateral compression strength test and the buckling strength test were performed on the resin bottle 1 according to the present embodiment, the comparative product 1 shown in FIG. 6, and the comparative product 2 shown in FIG. 7, the results are shown in the following table. 1 to Table 6. Comparative product 1 was trade name “Juroku Tea” 500 ml (Asahi Beverage Co., Ltd.) and weighed 23 g. Comparative product 2 was trade name “Natural water from Hakushu” 520 ml (manufactured by Coca-Cola Japan) and the weight was 18 g.

In the table, “immediately after filling” means that the product of this example and the comparative product 1 were measured for the product immediately after the beverage was filled, and the comparative product 2 was measured using a commercially available product as it was.
“After a long period of time” is obtained by removing 10 ml of the content liquid (beverage) and reducing the pressure.

(Lateral compression strength test)
Each resin bottle was stored at 4 ° C., and the amount of deformation of the bottle recess (mm) when a load of 58.8 N (Newton) was applied in the lateral direction of the bottle with a compression tester was measured. As shown in FIG. 5, the horizontal compression tester was measured by placing a resin bottle horizontally on a jig 31 and placing a weight 33 thereon. The width W1 of the weight 33 was 150 mm, and the weight 33 was placed with a space W2 from the bottom. W2 is 20.5 mm.
As shown in FIG. 5B, there are two measurement locations: a position facing the parting line (PL //) formed when a resin bottle is manufactured, and a position perpendicular to the parting line (PL⊥). It was done at the place.

(Buckling strength test)
As shown in FIG. 4, the beverage-containing resin bottle stored at room temperature is loaded in the longitudinal direction of the bottle with a compression tester and the displacement when 200 N load is applied and the load (strength) when buckled. And the amount of displacement was measured.
The transverse compressive strength test and the buckling strength test were performed five times for the resin bottles in each state, and the average was taken.
Tables 1 and 2 are examples of this example, Tables 3 and 4 are comparative example 1, and Tables 5 and 6 are comparative example 2.

  When comparing the average values of the transverse compressive strength test, the displacement amount immediately after filling in this example product was PL //, 3.28 mm, and PL⊥ was 3.53 mm. On the other hand, in Comparative Example Product 1, PL // is 4.73 mm and PL で は is 3.83 mm, and in Comparative Example Product 2 PL // is 4.11 mm and PL⊥ is 4 .33 mm. As a result, it is clear that the present example product has a smaller displacement than the comparative example products 1 and 2 and is strong against the lateral compression strength in the measurement at any position of PL // and PL⊥.

  Similarly, when the average values were compared even after a long period of time, both the PL // and PL kits had less displacement than the comparative products 1 and 2 except for some examples. . That is, PL // of comparative example product 1 (see Table 3) is 6.43 mm, PL // of comparative example product 2 (see Table 5) is 7.41 mm, and PL // of this example product. Is 4.98 mm (see Table 1), the displacement amount of this example product was smaller than that of Comparative Example products 1 and 2 at PL //.

  When the buckling strength is compared with each average value, as shown in Table 2, immediately after filling, the product of this example is 400.56 N, and the comparative product 1 (see Table 4) is 246.89 N. Since Example Product 2 (see Table 6) has a value of 436.98 N, the product of this Example was able to obtain a strength whose buckling strength was nearly twice that of Comparative Product 1. On the other hand, the buckling strength value was smaller than that of the comparative example product 2, but it was in a substantially equivalent range.

In the buckling strength, when comparing the average value after a long time, as is apparent from Table 2, the product of this example is 393.79 N, and the product of Comparative Example 1 (see Table 4) is 203.16 N. Yes, the comparative product 2 (see Table 6) is 324.66 N, and it is clear that the product of this example is superior to either of the comparative products 1 and 2 in terms of buckling strength in a reduced pressure state. It is.
As described above, it is apparent that the product of this example is generally superior to the comparative products 1 and 2 in terms of lateral compressive strength and buckling strength.

DESCRIPTION OF SYMBOLS 1 Resin bottle 5 Body part 11 Upper horizontal groove part 13 Curved recessed part 14 Horizontal groove 15 Lower horizontal groove part 23 Upper circular arc part 25 Lower circular arc part

Claims (6)

The body is formed with a plurality of upper and lower horizontal grooves formed continuously in the circumferential direction below the upper horizontal groove, and the entire peripheral surface is formed in a circular arc shape in the vertical direction so as to form a drum shape . A curved concave portion consisting only of an inwardly concave surface , and a lower horizontal groove portion formed below the curved concave portion and between the curved concave portion and the bottom portion in which a lateral groove continuous in the circumferential direction is formed. A resin bottle that is deformed when the inside is depressurized . 2. The resin bottle according to claim 1 , wherein the curved concave portion is formed in a region having a vertical dimension of 20% to 40% with respect to a height from the bottom to the neck ring. The resin-made bottle according to claim 2 , wherein the curved recess has a maximum recess size of 70% to 90% with respect to a maximum outer diameter of the body portion. Curved recess, vertically are composed of two consecutive circles arc, the upper arc according to any one of claims 1 to 3, characterized in that are smaller arc diameter than the lower circular arc Resin bottle. 5. The resin bottle according to claim 4 , wherein the diameter of the upper arc is 7 to 20% of the diameter of the lower arc. A resin bottle containing a beverage, wherein the resin bottle according to any one of claims 1 to 5 is filled with a beverage.

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