JPH08198230A - Reduced pressure absorbing container - Google Patents

Abstract

PURPOSE: To efficiently absorb internal reduced pressure caused during cooling after filling by forming reduced pressure absorbing parts into recesses inward a reduced pressure absorbing container in the container including a plurality of reduced pressure absorbing parts in the axial direction of a body with intervals and a buffer belt provided between a rim of the reduced pressure absorbing part and a body surface. CONSTITUTION: A reduced pressure absorbing container used for filling hot water, alcohol-containing hot water or the like comprises a body 1, a bottom 2 and a mouth 3, wherein a plurality of reduced pressure absorbing parts 4 are provided in an axial direction of the body 1 with intervals, and a buffer belt 6 is provided between a rim of the reduced pressure absorbing part and a surface of the body 1. In this case, the reduced pressure absorbing part 4 is formed in a structure having a recessed shape inward the container in order to improve the reduced pressure absorbing ability. A wide container wall, shape is set for an upper part of the container where large reduced pressure force occurs, while a narrow wall shape is set for a lower part of the container to obtain both reduced pressure absorbing ability and container strength, whereby good reduced pressure absorbing ability and buckling intensity can be both realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention effectively absorbs the depressurizing force inside the container, which is generated when the container is filled with hot water and then cooled, and the buckling strength when the container is filled with hot water. The feature is that the shortage is compensated by the shape.

[0002]

2. Description of the Related Art Conventionally, when a container is filled with hot water, alcohol-containing hot water or the like at about 70 to 93 ° C., sealed by a method such as winding, capping or the like, and then allowed to stand at room temperature (room temperature), Void above the container (head space)
Then, the decompression force calculated from the following equation of state of gas is generated. PV = nRT However, P: Pressure V: Volume n: Gas mole number (constant) R: Rydberry constant (constant) T: Temperature

In the above case, the density difference between the filled contents and the normal temperature occurs as a decompressing force in the filled contents, but in the case of the liquid contents, the weight increases as the container goes downward, A decompression absorption structure is required in the upper part of the container (including the head space), but the decompression absorption capacity in the lower part of the container is not as high as in the upper part, but the strength of the container is required to prevent bulging. Come on.

For the purpose of satisfying such requirements, for example,
(A) Jitsuko Sho 63-44341, (b) Jitsukaihei 5-8
9214 and (C) a container having a structure as shown in JP-A-6-336239 is proposed.
In the case of the container shown in (1), since the container wall functioning as the decompression absorption part and the container wall outside the container wall functioning as the decompression absorption part are included in the same plane, the container is filled with the contents at a high temperature. , Once swelled, the container wall that functions as a decompression absorption part that swelled when the contents cooled (when decompression occurred) did not easily or reliably dent inward (difficult to return to the original state) There is a problem.

More specifically, in the structure shown in (a) above, as shown in FIG. 5 showing the cross section of the container,
When a decompression force is applied to the container wall a that functions as a decompression absorbing portion, the container wall a itself is deformed from the planar shape b into a concave shape c, and the balance in the appearance of the container is lost, which is a serious problem. Further, the container wall a functioning as the above-mentioned decompression absorption part
Since the structure of (1) is also arranged in the lower part of the container (a part near the bottom), there is a problem that the body swells and the reduced pressure absorption capability does not function at all. That is, when the container wall a that functions as a decompression absorbing portion is provided over the entire vertical direction of the container body, the container wall a has a force in the decompression direction (a force toward the inside of the container) and a force in the body swelling direction. (Force toward the outside of the container) is received at the same time, and the function as an effective depressurization absorption part is diminished.

Further, in the above-mentioned container (b), when a depressurizing force is applied to the body of the container, the container is easily deformed in the entire height direction of the container. It is not desirable considering the capping and capping in the. On the other hand, in order to secure the buckling strength to withstand the force in the filling process, plugging process and capping process, it is necessary to thicken the entire container, and it is difficult to adjust it in relation to the vacuum absorption capacity, and the buckling strength There is a problem that it is difficult to satisfy both of the above and the vacuum absorption capacity.

Further, in the container shown in the above (c), the container wall functioning as a decompression absorbing portion is recessed inward, and the depth of the recess is changed between the upper and lower end portions and the central portion, so that the upper and lower end portions can be changed. In this structure, the rigidity of the container is suppressed to the utmost and only the reduced pressure absorption function is achieved.However, since the reduced pressure absorption part has a uniform structure over the entire height direction of the container, it works below the container. The pressure due to the weight of the filled contents cancels out the decompression force above the container and cannot exert an effective decompression absorption capability. Also, since the decompression absorber and the other body are directly adjacent to each other without any intervention, it is difficult for the decompression absorber to move following the expansion and contraction of the container due to the temperature change of the contents. The problem remains.

In any case, in the container shown in (a), (b) and (c), the upper part of the container in which the head space exists has a function of absorbing reduced pressure, and conversely for preventing the body swelling. The technical idea of suppressing the decompression absorption function is not disclosed below the container (a portion near the bottom) that requires the rigidity of the container as a whole, and no specific structure is shown.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems of the conventional container, the present invention provides a buffer band for facilitating the inward movement of the container wall in the outer frame of the container wall which absorbs the decompression force. In order to increase the capacity to absorb reduced pressure, the structure has a concave shape toward the inside of the container.When the pressure reducing force works inside the container, the pressure reducing absorption capacity is high in the upper part of the container where a large pressure reducing force is generated. A wide container wall shape is set for this purpose, and a narrow container wall shape is used to reduce the reduced pressure absorption capacity in order to achieve both reduced pressure absorption capacity and container strength in the lower part of the container where both pressure reduction force, gravity, and both effects occur. It is an object of the present invention to provide a container that has both excellent vacuum absorption capacity and good buckling strength after being set.

[0010]

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and in a plastic container comprising a body, a bottom and a mouth, a decompression absorber is arranged in the axial direction of the body. A plurality of opened and opened, the reduced pressure absorption portion is a recess toward the inside of the container is a reduced pressure absorption container, further, in a plastic container consisting of a body portion, a bottom portion and a mouth portion, A reduced pressure absorption container characterized in that a plurality of reduced pressure absorption parts are provided at intervals in the axial direction, and the shape of the reduced pressure absorption part has a large surface area in the upper part of the container and a small surface area in the lower part of the container. .

[0011]

Since the present invention has the above-mentioned structure, the decompression absorption portion follows the expansion and the contraction after the contents are filled at a high temperature due to the presence of the buffer band portion and the contraction after the cooling. It moves smoothly, without irregular deformation or crushing of the container,
It can be used for filling, sealing and distribution. According to the second aspect of the invention, this tendency becomes more remarkable.

Further, according to the invention of claim 3, the upper portion of the container where the reduced pressure absorption is required moves reliably and smoothly, and the lower portion where the strength is required has the area of the reduced pressure absorption portion. Since it is small, it hardly deforms and prevents the body from bulging. According to the invention of claim 4 or 5, the decompression absorber moves more reliably and smoothly inward and outward, and has an appropriate size according to the weight of the contents, the capacity of the container and the decompression force generated inside the container. It is possible to set a reduced pressure absorbing portion extending in the vertical direction of the container, and it is possible to exert a large reduced pressure absorbing effect with a small number of reduced pressure absorbing portions.

Further, according to the invention of claim 7, the buffer band portion between the edge portion of the decompression absorption portion and the surface of the decompression portion smoothly expands and contracts in response to the pressure change in the container, and the decompression absorption portion follows it. Make sure that the parts move in and out of the container.

Examples of the present invention will be described below.

【Example】

<Example> In order to confirm the effect of the present invention, the following four types of containers A, B, C, and D shown in FIGS.
Create each one, fill 200 ml of hot water at 70 ° C, close the cap within 1 minute, and leave it at room temperature to evaluate the deformed state by the decompression force and the buckling strength of the unfilled container in each shape. did. In the evaluation of the deformed state, the number of containers deformed into an irregular shape out of 50 containers was expressed in%, and the evaluation result is shown in (Table 1). In addition, the buckling strength was evaluated by measuring the load when a strain of 4 mm was generated with a Tensilon tester, and if the load was 40 kgf or more, the buckling strength was evaluated as being practical. Container A: No decompression absorption part Container B: Decompression absorption part area: same up and down (decompression absorption part is convex outward) Container C: Decompression absorption part area: Large upper-lower small (decompression absorption part is outward) Convex) Container D: Reduced pressure absorbing area area ... Large upper-lower small (Depressurized absorbing portion is convex inward) As a result of evaluation, Container A was able to satisfy the buckling strength, but all 50 had an irregular shape. Therefore, the container B could not satisfy the buckling strength, and nearly half of the containers were deformed into irregular shapes, which was not practical. On the other hand, the buckling strength of the container C is a value within a range that can be practically used, and the deformed irregular shape is a little over 10%, and the buckling strength of the container D is a value within a range that can be practically used. It was confirmed that there was nothing deformed into a regular shape, and that it was sufficiently practical.

[0015]

[Table 1]

The resin materials, molding methods, container dimensions, weights, and wall thickness distributions of the containers A to D that were comparatively evaluated are as follows. <Resin Material> Polyethylene terephthalate: RT543M (manufactured by Nippon Unipet Co., Ltd.) Intrinsic viscosity IV = 0.78 <Molding method> Stretch blow molding by hot parison method Molding machine: ASB-50 (Nissei ASB Machinery Co., Ltd.) Made) <Container dimensions> Height: 120mm Caliber: 48mm Body diameter: 52mm
Volume: 220 ml <Thickness distribution> Mouth: 1.0 mm Body: 0.50 to 0.55 mm Bottom: 1.1 mm <Container weight> 15 g

[0017]

According to the present invention, the reduced-pressure absorbing portion is formed in the recess toward the inside of the container, so that it is easily deformed against expansion after the contents are filled at a high temperature and contraction after cooling, and the buffer band portion The presence of the decompression absorber smoothly moves inward and outward,
It is possible to provide a plastic container having an excellent appearance without causing irregular deformation or crushing of the container.

By making the shape of the decompression absorption section the shape of the invention of claim 4 or 5, the decompression absorption section smoothly moves and expands in the upper part of the container where the expansion and contraction due to the temperature change of the contents are severe.・ The container does not deform at the lower part of the container, which requires a small amount of shrinkage and strength against the weight of the contents, and prevents body swelling. Then, the rib effect is exerted at the intersection of the straight line or the curved line below the reduced pressure absorbing portion, and the buckling strength is improved. Further, by selecting the thickness of the buffer strip within the scope of claim 7, it is possible to provide the buffer strip with an optimal expansion and contraction action in accordance with the capacity of the container, the temperature of the contents, and the like.

[0019]

[Brief description of drawings]

FIG. 1 is an explanatory view of a container showing a first embodiment of the present invention,
(A) is a side view, (B) is a XX sectional view.

FIG. 2 is an explanatory view of a container showing a first comparative example for confirming the reduced pressure absorption effect of the present invention, in which (a) is a side view and (b) is
Is a sectional view taken along line xx.

FIG. 3 is an explanatory view of a container showing a second comparative example for confirming the reduced pressure absorption effect of the present invention, in which (a) is a side view and (b) is
Is a yy sectional view.

FIG. 4 is an explanatory view of a container showing a second embodiment of the present invention,
(A) is a side view, (B) is a YY sectional view.

5A and 5B are explanatory views showing a conventional reduced-pressure absorption container, FIG. 5A is a side view, and FIG. 5B is a zz cross-sectional view.

[Explanation of symbols]

 1 body part 2 bottom part 3 mouth part 4 decompression absorption part 5 wall 6 buffer band part

Claims (7)

[Claims] 1. A body portion, a bottom portion and a mouth portion, a plurality of decompression absorbing portions are provided at intervals in the axial direction of the body portion, and a buffer is provided between the edge portion of the decompression absorbing portion and the body portion surface. A reduced pressure absorption container provided with a band portion, wherein the reduced pressure absorption part is a concave portion directed inward of the container. 2. The reduced-pressure absorption container according to claim 1, wherein the buffer band portion is a concave portion directed inward of the container. 3. A body portion, a bottom portion and a mouth portion, and a plurality of decompression absorbing portions are provided at intervals in the axial direction of the body portion, and a buffer is provided between the edge portion of the decompression absorbing portion and the body portion surface. A reduced pressure absorption container provided with a band, wherein the reduced pressure absorption part has a large surface area at the upper part of the container and a small surface area at the lower part of the container. 4. The reduced pressure absorption container according to claim 3, wherein the reduced pressure absorption part has a rectangular shape at the upper part of the container and a straight line intersecting at the lower end at the lower part of the container. 5. The reduced pressure absorption container according to claim 3, wherein the reduced pressure absorption part has a rectangular shape at the upper part of the container and a curved line intersecting at the lower end at the lower part of the container. 6. The reduced pressure absorption container according to claim 3, wherein the reduced pressure absorption part is a concave portion directed inward of the container. 7. A cushion portion, a bottom portion and a mouth portion, wherein a plurality of depressurization absorbing portions are provided at intervals in the axial direction of the trunk portion, and a buffer is provided between an edge portion of the depressurizing absorption portion and the surface of the trunk portion. In the vacuum absorbent container provided with a band, the average thickness of the buffer band is 1.10 to 0.40 times the average thickness of the body, preferably 0.8.
A reduced-pressure absorption container characterized by being 0 to 0.65 times.