JP2009262989A - Resin-made beverage container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container with a filled liquid capacity of more than 500 ml capable of being sold by or being subjected to sales management of a vending machine for a conventional 500 ml beverage container without alteration of the conventional vending machine and a displaying shelf of a refrigerator-hot storage or the like, which can be formed from a preform for the 500 ml container, and can ensure an enough container strength even though the thickness becomes thinner than that of the conventional container. <P>SOLUTION: In the container for beverage made of a resin with a cylindrical shape, a body part 3 has a vacuum absorbing site 4 arranged with a vacuum absorbing panel and a site 5 for ensuring the volume and for dispersing the stress. The body part has recessed stripe ribs 7-9 along the peripheral direction of the cylinder at the boundary between the shoulder part and the body part, at the boundary between the vacuum absorbing site and the site for ensuring the volume and for dispersing the stress, and at the boundary between the body part and the bottom part. The site for ensuring the volume and for dispersing the stress has a recessed part-flat part composite structure 30 on a sidewall. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin container for beverages in which deformation such as buckling and dent during transportation or in a vending machine is suppressed.

  Synthetic resin containers such as polyethylene terephthalate resin bottles (so-called PET bottles) formed by biaxial stretch blow molding or the like can be produced in large quantities by a relatively simple method. It is possible, is light in weight as compared with glass containers, and is easy to handle, so it is widely used as a container for filling beverages and the like.

  Such a resin container keeps a predetermined shape while suppressing the amount of resin used for it as much as possible, and even when stacked in several stages or more during warehouse storage, it can be easily applied by the load of the vertical direction. In order to prevent buckling, the body portion of the container is provided with irregularities such as vertical ribs and horizontal ribs for improving rigidity as a reinforcing structure.

  For example, it has a waist that divides the fuselage part into at least two parts in the upper and lower sides, a handling recess is provided in the waist, and the fuselage part is separated from the bottom wall of the partitioning recess between the partitioning recess and the fuselage part. There is a proposal of a synthetic resin bottle-type container provided with a stepped portion in which stepped portions are arranged stepwise toward the outer surface (see Patent Document 1). This container is intended to reliably restore the deformation caused by an external force that is inadvertently applied to the body portion of the container or the deformation that occurs during the handling of gripping the body portion and dispensing the contents.

  Further, the body portion of the container is formed to be extremely thin so that a rectangular concave portion is formed on the body wall portion so that a pair of opposite corner portions are in the vertical direction, and the concave portion is approximately in the vertical direction and the circumferential direction. There is a proposal of an ultra-thin hollow container formed by aligning in a lattice shape (see Patent Document 2). This container is not easily buckled against an external force in the vertical direction, and can be crushed and compressed to a small size when it has been used.

  In addition, the body of the polyester bag is provided with rectangular concave portions arranged in the body portion of the thin container at equal intervals in the vertical and horizontal directions on the body wall portion, and an inclined wall connected to the outer surface of the body portion at the periphery of each concave portion. There is a proposal of a partial structure (see Patent Document 3).

  Furthermore, in order to relieve the positive pressure when filling the high-temperature contents and the reduced pressure after cooling, excessive protrusion is suppressed during positive pressure, and when the pressure is reduced, the original state is restored and further inside the bottle. There is a proposal of a plastic bottle provided with a reduced pressure absorption panel having a structure that absorbs reduced pressure by being recessed (see Patent Document 4).

JP 2004-292039 A JP 2001-301729 A Japanese Utility Model Publication No. 53-25855 JP 2007-186225 A

  As described in Patent Documents 1 to 4, the present situation is that strength is reinforced by providing various recesses in the body wall of the resin container.

  By the way, beverage products are sold not only at store sales but also at vending machines. Vending machines are periodically replenished with goods, but in order to prevent running out of goods, goods are stocked inside. At this time, the products are laid down and waited in a stacked state, and are sold in order from the lower products. Therefore, until the product is put into the vending machine, it is required not to buckle against the vertical load caused by stacking during distribution or storage. Crush resistance due to the application of a load substantially perpendicular to the side surface of the part is required.

  In addition, beverage products sold in vending machines are higher in the vending machine's storage space than the store shelves (in order to lay containers on the vending machine, In actuality, this corresponds to the width of the storage space.) Since the storage space is low, a container that matches the height of the storage space of the vending machine is used. In other words, it is possible to line up both beverage products using storefront display containers and beverage products using vending machine containers on store shelves. Beverage products that use containers for store display cannot be placed. Further, the container body diameter is not strictly limited for beverage products sold in store shelves, but the vending machine is limited in the size of the storage space. In this way, containers for beverage products sold by vending machines are limited in height and body diameter, and therefore containers for vending machines are used.

  Here, there are vending machines that can sell large containers of 1 to 2 liters, but because there are only a small number of vending machines that can be stocked in vending machines, if they are installed away from the store, other small It is difficult to manage sales in patrols with the same frequency as beverage products using containers. In addition, a container of more than 1 liter has a problem that it is too much to drink when opened, and is heavy and bulky even when it is carried. On the other hand, a product using a container with a conventional filling liquid amount of up to 500 ml may not meet the needs of a large capacity, and a container with a capacity of more than 500 ml and less than 1 liter is required.

  Therefore, in order to satisfy the capacity exceeding 500 ml of the filling liquid, it is necessary to increase the size of the container. However, while accepting the restrictions on the height and the body diameter in the vending machine, the seat is resistant to vertical load. It is necessary to provide sufficient flexibility and crush resistance on the side surface of the body portion. Here, even if the container is enlarged, it is not desirable from the economical and environmental viewpoints to increase the amount of resin used in the container in order to ensure strength, and it is possible to form a large capacity container from a preform for a 500 ml container. desired. That is, it is required to secure strength while reducing the weight of the container on the basis of the capacity.

  Although it is possible to change the height or width of the storage space by modifying conventional shelves such as vending machines and cold / hot storage, these modifications are considered in view of the effort and management. A large-capacity container that can cope with this is desired.

  In the technique of Patent Document 1 or 4, the recessed portion of the container is large, and a sufficient volume of the container cannot be ensured. In the technique of Patent Document 4, it is possible to secure the volume of the container to some extent by reducing the depth of the concave part and adjusting the diameter of the body part. However, as a container for a vending machine, There is no crush resistance. Moreover, in the trunk | drum structure of patent document 2 or 3, although it is possible to secure the volume of a container to some extent by reducing the depth of a recessed part and adjusting the diameter of a trunk | drum, as a container for vending machines, There was a drawback that the side surface of the body portion was not crushed, and the resilience against the crushing was weak, and the recesses in the document had no reduced pressure absorption.

  In the present invention, it is possible to sell and manage a conventional 500 ml beverage container with a vending machine without modification of a conventional vending machine or a display shelf such as a cold / hot storage, for a 500 ml container. It is an object of the present invention to propose a container that can be formed from this preform and has a sufficient container strength and can exceed 500 ml even though the wall thickness is thinner than that of a conventional container.

  The present inventor believes that, in a plastic beverage container, buckling resistance when a longitudinal load is applied during transportation and a lateral load when stocked in a vending machine are applied. In order to ensure the crushed resistance when it is done, it is possible to achieve the above-mentioned purpose by providing a balance between the site for securing the basic strength, the site for securing the vacuum absorption, and the site for securing the capacity and dispersing the stress. The headline and the present invention were completed. That is, the resin beverage container according to the present invention is obtained by blow-molding a thermoplastic synthetic resin, a mouth portion serving as a drinking mouth, a shoulder portion having a diameter expanded from the mouth portion, a trunk portion, and a bottom portion. In the resin beverage container having a cylindrical shape that is sequentially connected, the body portion has a reduced pressure absorption portion provided with a reduced pressure absorption panel and a capacity securing and stress distribution portion, The side wall has a cylindrical periphery at least at the boundary between the shoulder and the body, the boundary between the reduced pressure absorption region and the capacity securing and stress distribution region, and the boundary between the body and the bottom. The capacity securing and stress distribution portion has concave ribs along the direction, and the capacity securing and stress distribution portion is provided with a concave portion and a concave portion and a flat portion alternately arranged at a position surrounding the concave portion around the concave portion on the side wall. And the recesses are not connected to each other. - and having a flat portion composite structure. Here, the case where the resin beverage container according to the present invention is a beverage product container sold by a vending machine is included.

  The resin beverage container according to the present invention includes a form in which the full volume is 525 to 650 ml, the thermoplastic synthetic resin is a polyethylene terephthalate resin, and the resin usage is 16 to 23 g. The present invention includes a case of a large-capacity container having a full injection volume of 525 to 650 ml, which is formed by using a preform for a 500 ml container conventionally used or a preform further reduced in weight. .

  In the resin beverage container according to the present invention, the ratio B / A between the maximum diameter A and the minimum diameter B of the body portion is preferably 0.92-1. Even if the container body is a small cylinder, the presence of the above-mentioned three parts imparts buckling resistance and crush resistance, and at the same time increases the full volume.

  In the resin beverage container according to the present invention, it is preferable that the surface of the shoulder portion has an inclined surface of 50 to 70 ° with respect to a horizontal plane. It is easy to obtain buckling resistance when a longitudinal load is applied.

  The bottle is thinner than the conventional 500ml container by arranging the parts that secure the basic strength of the bottle, the parts that are mainly aimed at securing vacuum absorption and the parts that are mainly aimed at securing capacity and stress dispersion. Therefore, it was possible to effectively suppress deformation of the container such as buckling during transportation and storage, crushing during stocking in a vending machine, and deformation under reduced pressure when refrigerated. That is, a resin beverage container exceeding 500 ml can be formed from a preform for a 500 ml container, and a sufficient container strength is ensured even though the wall thickness is thinner than that of a conventional container. In addition, the conventional 500 ml beverage container vending machine can be sold and managed without modification of conventional vending machines and display shelves such as cold / hot storage.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment. Various modifications may be made as long as the effects of the present invention are achieved.

  Drawing 1 is a schematic diagram showing one form of a resin beverage container concerning this embodiment, and is a front view of a side. As shown in FIG. 1, a resin beverage container 100 according to the present embodiment is obtained by blow molding a thermoplastic synthetic resin, and has a mouth part 1 serving as a drinking mouth and a shoulder part having a diameter increased from the mouth part 1. 2, a body 3, and a bottom 6 are connected in order. Here, the resin beverage container according to the present embodiment may be a container for beverage products sold by store display, but mainly a resin beverage container for beverage products sold by vending machines. set to target. And the trunk | drum 3 becomes the pressure | voltage reduction absorption part 4 which has arrange | positioned the pressure reduction absorption panel 10, and the capacity | capacitance securing and stress used as the final adjustment part of a container volume in a container design, and a part which distributes the stress from the vertical and horizontal direction And a dispersion portion 5. Further, the side wall of the body part 3 includes at least a boundary between the shoulder part 2 and the body part 3, a boundary between the decompression absorption part 4 and the capacity securing / stress distribution part 5, and a boundary between the body part 3 and the bottom part 6. Further, it has concave ribs 7, 8, 9 along the circumferential direction of the cylinder. Further, the capacity securing / stress distribution portion 5 includes, on the side wall, the recesses 21, the recesses 22, 24, 26, 28 and the flat portions 23, 25, which are alternately arranged at positions surrounding the recesses 21. 27, 29 are used as repeating units, and the recesses 21, 22, 24, 26, 28 each have a recess-flat portion composite structure 30 that is not connected to each other.

  Examples of the thermoplastic synthetic resin for molding the resin beverage container 100 include polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene naphthalate resin, polyethylene resin (PE), polypropylene resin (PP), and cycloolefin copolymer. Resin (COC, cyclic olefin copolymer), ionomer resin, poly-4-methylpentene-1 resin, polymethyl methacrylate resin, polystyrene resin, ethylene-vinyl alcohol copolymer resin, acrylonitrile resin, polyvinyl chloride resin, polychlorinated resin Vinylidene resin, polyamide resin, polyamideimide resin, polyacetal resin, polycarbonate resin, polysulfone resin, or tetrafluoroethylene resin, acrylonitrile-styrene resin, acrylonitrile-butadiene Down - it can be exemplified styrene resin. Among these, PET resin is preferable. Using these resins, the resin beverage container 100 is formed by general blow molding, for example, biaxial stretch blow molding.

  As shown in FIG. 1, the resin beverage container 100 is roughly classified into a mouth part 1 serving as a drinking mouth, a shoulder part 2 having a diameter expanded from the mouth part 1, a trunk part 3, and a bottom part 6 in order. It has a cylindrical shape that is connected. The mouth portion 1 is provided with a neck support ring 11 and a screw portion 12 for attaching a cap. The resin beverage container 100 is mainly an aseptic filling bottle in which a beverage and a bottle are sterilized separately before filling, filled in a sterile room at room temperature, and sealed with a sterilized cap (aseptic filling). Yes, it is a non-heat-resistant bottle. And, in order to make a resin beverage container for beverage products sold in vending machines, the resin beverage container is resistant to buckling when a longitudinal load is applied during transportation. Both crush resistance when subjected to lateral loads when stocked in vending machines is required. Furthermore, since this resin beverage container is stocked in a vending machine, it needs to be accommodated in a stock storage space. For this reason, the maximum volume is designed to be 525 ml or more, preferably more than 525 ml to 650 ml or less, more preferably 540 to 625 ml, with the upper limit being 207 mm in height and 69 mm in body diameter. At this time, it is desired that the preform (for example, made of PET resin) be 16 to 23 g. The current preform for a 500 ml container weighs approximately 23 g, and it is preferable to use a preform that is at least as light as this or even lighter. At present, approximately 23 g of a preform is used to obtain a 500 ml PET bottle (full volume of 525 ml). For example, if a preformed bottle of 625 ml is molded using this preform, about 25% (23 g The weight reduction of the product liquid per gram (ml / g) is achieved based on the 500 ml PET bottle obtained using the preform. Further, if a PET bottle having a full injection volume of 625 ml, for example, is molded using a 16 g preform, a weight reduction of about 80% can be achieved in the same comparison. When the weight is reduced in this way, the container is naturally thinned, so that the buckling resistance and the collapse resistance are expected to decrease. Therefore, in the resin beverage container according to the present embodiment, a portion for securing basic strength, a portion for securing reduced pressure absorption, and a portion for securing capacity and dispersing stress are provided in a balanced manner. Hereinafter, it demonstrates in order.

  As a part for securing the basic strength, there is a shoulder 2 first. Here, in order to maximize the buckling resistance, the surface of the shoulder portion 2 has an inclined surface of 50 to 70 °, preferably an inclined surface of 55 to 65 °, more specifically 60, with respect to the horizontal plane. An inclined surface of °. When the angle of the inclined surface exceeds 70 °, it is difficult to secure the capacity. On the other hand, if the angle of the inclined surface is less than 50 °, the buckling resistance decreases. In addition, in FIG. 1, the angle which the surface of the shoulder part 2 makes on the basis of a horizontal surface was described as (alpha).

  As a part for securing the basic strength, there is a groove (rib) provided along the circumferential direction of the cylinder. The ribs on the concave stripes will be moderately bent when a vertical load is applied to absorb the stress, while when a lateral crushing load is applied, the rib will support the load. It becomes one of. In the resin beverage container according to the present embodiment, the ribs 7 having concave stripes are provided on the side wall of the body 3 at least at the boundary between the shoulder 2 and the body 3 along the circumferential direction of the cylinder. Further, a concave rib 8 is provided along the circumferential direction of the cylinder at the boundary between the reduced pressure absorbing portion 4 and the capacity securing / stress dispersing portion 5. Further, a concave rib 9 is provided at the boundary between the body portion 3 and the bottom portion 6 along the circumferential direction of the cylinder. The concave ribs 7, 8, and 9 may be provided in an annular shape over the entire circumference along the circumferential direction of the cylinder, or in a form provided in a part (that is, a fragment annular shape), but provided in an annular shape over the entire circumference. The form is preferable for maintaining the crush resistance. In the resin beverage container 100 according to FIG. 1, a configuration in which three concave ribs are provided is shown, but one rib may be arranged side by side to be four. However, if 5 or more, it will bend too much when a vertical load is applied (shrinks in the vertical direction), and the buckling resistance tends to decrease. Is more preferable. On the other hand, if the number of concave ribs is two or less, the crush resistance is not sufficient. Moreover, it is preferable to provide the concave ribs at substantially equal intervals. For example, if one length of the rib interval is 1, it is preferable to set the other rib interval to a length of 1 ± 0.1. By making the rib interval substantially equal, the reduced pressure absorbing portion 4 and the capacity securing / stress dispersing portion 5 are substantially the same height. Here, when the height of the reduced pressure absorbing portion 4 is increased and the height of the capacity securing and stress dispersing portion 5 is decreased, the reduced pressure absorbing capacity is increased, while the full volume of the container is decreased. On the other hand, when the height of the reduced pressure absorbing portion 4 is reduced and the height of the capacity securing and stress dispersing portion 5 is increased, the full volume of the container can be increased, but the reduced pressure absorbing capacity is insufficient. Therefore, if the reduced pressure absorption site 4 and the capacity securing / stress distribution site 5 are substantially the same height, the full volume of the container can be increased while ensuring the reduced pressure absorption capability, and the balance is good.

  In the resin beverage container 100 according to FIG. 1, in the trunk portion 3, the vacuum absorption part 4 and the capacity securing / stress distribution part 5 are arranged in order from the top, but the capacity securing / stress dispersion part 5 from above. Alternatively, they may be arranged in the order of the reduced pressure absorption site 4.

  The reduced-pressure absorption part 4 has the reduced-pressure absorption panel 10 in a state where the reduced-pressure absorption panel 10 is juxtaposed in the circumferential direction of the body part 3. The reduced pressure absorption panel 10 has a hollow shape with a large area at the bottom of the hollow. The bottom surface of the recess may be a curved surface along the cylindrical side surface, or a convex shape may be provided again within a range not exceeding the wall surface of the body portion 3 from the bottom surface of the recess as shown in FIG. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 and shows one form of a cross-sectional shape of the vacuum absorbing panel. In any case, the reduced pressure absorption panel 10 may have a structure that suppresses excessive protrusion by the reduced pressure absorption panel 10 at the positive pressure and restores the original state at the time of the reduced pressure and further dents inside the bottle to absorb the reduced pressure. Here, in the resin beverage container 100 according to FIG. 1, the height of the reduced pressure absorption panel 10 corresponds to about 75% of the height of the reduced pressure absorption portion 4. Further, eight decompression absorption panels 10 are provided in parallel in the circumferential direction. In the resin beverage container according to the present embodiment, the height of the reduced pressure absorption panel 10 is 70 to 80% of the height of the reduced pressure absorption portion 4, and 6 to 8 reduced pressure absorption panels are arranged in parallel in the circumferential direction. It is preferable to provide them. If the height of the reduced pressure absorption panel 10 is 70 to 80% of the height of the reduced pressure absorption portion 4, only one stage of the reduced pressure absorption panel 10 can be provided in the height direction of the container, but the ratio is less than 50%. When two or more vacuum absorbing panels 10 are provided, the vacuum absorbing capacity is inferior. Moreover, if five or less decompression absorption panels are provided in parallel in the circumferential direction, the cylindrical shape cannot be maintained, and a polygonal cylindrical container shape is obtained. On the other hand, when nine or more vacuum absorption panels are provided in parallel in the circumferential direction, the vacuum absorption capacity is inferior and the full volume of the container is reduced.

  The capacity securing / stress distribution part 5 is a part for securing a necessary full volume with a limited body diameter, and the volume is finally adjusted at the capacity securing / stress dispersion part 5 in the container shape design. To simply maximize the full volume, the complete cylindrical shape, i.e. the shape in the cross section of the container main shaft, is circular. However, in this case, there is almost no crush resistance with respect to the load from the lateral direction. Therefore, it is not suitable as a container for a vending machine. Therefore, in the resin beverage container according to the present embodiment, as shown in FIG. 1, for example, the recessed portion-flat portion composite structure 30 is provided in the capacity securing and stress dispersing portion 5. By providing the recessed portion-flat portion composite structure 30, the capacity securing and stress dispersing portion 5 also serves as a portion for dispersing stress from the vertical and horizontal directions. In the concave portion-flat portion composite structure 30, the concave portion 21, the flat portion 23, the concave portion 24, the flat portion 25, the concave portion 26, the flat portion 27, and the concave portion are disposed on the side wall at a position surrounding the concave portion 21 with the concave portion 21 as a center. 28, a combination of peripheral concave portions and flat portions alternately arranged like the flat portion 29 is used as a repeating unit. In addition, the setting of this repeating unit can be performed by overlapping a recessed part and a flat part partially. Therefore, for example, in FIG. 1, 1 to 3 steps from the top of the front are set as the repeating unit, but 2 to 4 steps from the top of the front are also set as the repeating unit. Furthermore, in the recessed part-flat part composite structure 30, the recessed parts 21, 22, 24, 26, and 28 are not connected to each other. This is to disperse the stress as will be described later. In addition, it is preferable that the periphery of a recessed part is made into an inclined surface in consideration of preparation and moldability of a metal mold | die.

  In FIG. 1, the shape of the recess is square when viewed from the front, but may be a rectangle, a triangle, or a polygon that is a pentagon or more. FIG. 3 shows another embodiment of the repeating unit of the concave portion-flat portion composite structure. FIG. 3A shows a recess-flat portion composite structure 44 in which the recess is circular in a front view, and there are six recesses 32, 34, 36, 38, 40, 42 and six around one recess 31. When the flat portions 33, 35, 37, 39, 41, and 43 are alternately surrounded, (b) is a concave-flat portion composite structure 60, the concave portion is a pentagon or hexagon in front view, and one concave portion A case where four concave portions 52, 54, 56, 58 (hexagon) and four flat portions 53, 55, 57, 59 are alternately surrounded around 51 (pentagon) is shown.

  Since the reduced-pressure absorption part 4 is provided, the recesses in the capacity securing and stress dispersion part 5 do not need to have a reduced-pressure absorption capability, and the size of each recess is preferably smaller than that of the reduced-pressure absorption panel 10. For example, it is preferable to provide three or more recesses in the height direction of the capacity securing / stress distribution portion 5. FIG. 1 shows a case where five recesses are provided. Thus, it is preferable that the height of each recess is 10 to 30% of the height of the capacity securing / stress distribution portion 5. For example, when the height of the concave portion is 1, the horizontal length of the concave portion is preferably set to a length of 0.5 to 2 in the horizontal direction of the concave portion, and substantially the same as each height of the concave portion. It is more preferable to set it as 0.9-1.1. Here, the recesses in the capacity securing and stress distribution site 5 are specifically used as means for finally adjusting the full volume of the container to a desired amount, and the area of the bottom surface of the recess, the depth of the recesses, and the number of the recesses Determines the degree of volume reduction.

  FIG. 4 is a conceptual diagram for explaining how the stress is dispersed when a load is applied to the container. FIG. 4A shows a case where a load is applied in the vertical direction, and FIG. The case where the load of the load was applied from the horizontal direction of the trunk | drum was shown. In FIG. 4, the arrows conceptually indicate the direction in which the stress is transmitted. By providing the concave portion-flat portion composite structure 30, as shown in FIG. 4A, the stress should avoid the concave portions 21, 22, 24, 26, and 28 with respect to the load applied in the vertical direction. The connected flat part is transmitted downward. At this time, the stress is dispersed. Also, as shown in FIG. 4B, similarly to the load applied in the lateral direction, the stress is applied to the flat part connected so as to avoid the concave parts 21, 22, 24, 26, and 28. It is transmitted in the direction. At this time, the stress is dispersed. Even when a load is applied obliquely, the stress is similarly dispersed.

  If the concave portions are arranged in a lattice shape, the flat portion is connected in a straight line, and the deformation resistance in that direction is improved, but the stress is difficult to disperse, and the directivity in the deformation resistance direction is increased. It exhibits behavior that causes sudden deformation at the limit load, and its recoverability is weak. The recessed portion-flat portion composite structure 30 in the present embodiment can be provided with both buckling resistance and crushed resistance, and in particular, when the beverage product below is sold at the time of selling the vending machine. When the product moves in a wave-like downward direction in the stock storage space, a load is applied to the side wall of the container body from various directions, and it is crushed against such a load. . In addition, slippage is suppressed by the recess, and a feeling of holding during drinking is improved.

  In the resin beverage container 100, the ratio B / A between the maximum diameter A and the minimum diameter B of the body 3 is preferably 0.92-1. Even if the container body is a size cylinder, buckling resistance and crush resistance are imparted by the presence of three parts: a part for securing basic strength, a reduced pressure absorption part 4 and a capacity securing / stress distribution part 5. The full volume can be increased.

  In addition, the crushing resistance of the resin beverage container 100 is determined in consideration of the contact point between the containers, for example, when a load is applied to the position of the rib 7, a load is applied to the position of the rib 9, and Three cases in which a load is applied on average over the entire height direction of the body portion 3 are evaluated by the presence or absence of crushing when a predetermined amount of load is applied. Further, the buckling resistance of the resin beverage container 100 is evaluated by applying a predetermined load in the vertical direction from the top surface of the container, and when there is a deflection amount and buckling, the load is applied at that time. .

It is the schematic which shows one form of the resin drink containers which concern on this embodiment, and is a front view of the side. It is AA sectional drawing of FIG. 1, and has shown one form of the cross-sectional shape of a reduced pressure absorption panel. It is the schematic which shows the other form of the repeating unit of a recessed part-flat part composite structure, (a) is a recessed part circularly by a front view, and there are six recessed parts and six flat parts around one recessed part. When alternately surrounding, (b) is a pentagon or hexagonal recess when viewed from the front, and four recesses (hexagon) and four flat portions are alternately surrounded around one recess (pentagon). The surrounding case is shown. It is a conceptual diagram for demonstrating a mode that the stress when the load of a load is applied to a container is distributed, (a) is a case where a load of a load is applied to the perpendicular direction, (b) is the side of a trunk | drum. The case where a load was applied from the direction was shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Resin drink container 1 Mouth part 2 Shoulder part 3 Trunk part 4 Decompression absorption part 5 Capacity securing and stress distribution part 6 Bottom part 7, 8, 9 Recessed rib 10 Decompression absorption panel 11 Neck support ring 12 Cap is attached Thread portion 21, 22, 24, 26, 28, 31, 32, 34, 36, 38, 40, 42, 51, 52, 54, 56, 58 Recess 23, 25, 27, 29, 33, 35, 37 , 39, 41, 43, 53, 55, 57, 59 Flat part 30, 44, 60 Concave-flat part composite structure

Claims (5)

A resin having a cylindrical shape obtained by blow molding a thermoplastic synthetic resin, in which a mouth portion serving as a drinking mouth, a shoulder portion having a diameter expanded from the mouth portion, a body portion, and a bottom portion are successively connected. In beverage containers,
The body portion has a reduced pressure absorption portion where a reduced pressure absorption panel is disposed and a capacity securing and stress dispersion portion,
The side wall of the trunk part is at least at the boundary between the shoulder part and the trunk part, the boundary between the reduced pressure absorption part and the capacity securing and stress distribution part, and the boundary between the trunk part and the bottom part. , Having a concave rib along the circumferential direction of the cylinder, and
The capacity securing / stress distribution portion has a recess, a recess, and a recess and a flat portion alternately arranged at positions surrounding the recess with the recess as a center, and the recesses are connected to each other. A resin beverage container characterized by having a non-recessed portion-flat portion composite structure.   2. The resin beverage container according to claim 1, which is a resin beverage container for beverage products sold in a vending machine.   3. The resin beverage container according to claim 1, wherein the full volume is 525 to 650 ml, the thermoplastic synthetic resin is polyethylene terephthalate resin, and the resin usage is 16 to 23 g.   4. The resin beverage container according to claim 1, wherein a ratio B / A between the maximum diameter A and the minimum diameter B of the trunk portion is 0.92 to 1. 5. 5. The resin beverage container according to claim 1, wherein a surface of the shoulder portion is an inclined surface of 50 to 70 ° with respect to a horizontal plane.