JP2009280274A - Container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container having a shoulder of a shape different from that of a shoulder of a conventional container, improved in visual aesthetic appearance and prevented from being damaged by a vertical compressive load while eliminating a peripheral recessed rib. <P>SOLUTION: This container 10 has a barrel 40 and a shoulder 30 of which the diameter is gradually reduced as it extends from the upper end of the barrel 40 toward upward. In this case, this container is provided with a first curved part 38 formed at the shoulder 30 in an axial section of the container 10 and curved toward inside the container 10 and with a second curved part 39 cooperatively connecting the first curved part 38 to the barrel 40 in an axial section of the container 10 and curved outside the container 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a container for containing a liquid.

In recent years, containers made of a synthetic resin such as polyethylene terephthalate (hereinafter referred to as “PET”) resin are frequently used as containers for beverages such as tea drinks and fruit juice drinks. Many of these conventional containers have a shape as described in Patent Document 1, for example. That is, it has a bowl-shaped shoulder portion that bulges toward the outside of the container, and a circumferentially concave rib that forms a ring over the entire circumference near the upper end of the body portion of the container. The conventional container has a bowl-shaped shoulder, so that when the vertical compressive load in the axial direction is applied to the container, it avoids excessive stress concentration at the shoulder and prevents the container from buckling. It is preventing. In addition, the conventional container has circumferential concave ribs to prevent the container from buckling by deforming and relaxing the stress when a vertical compressive load is applied to the container, and to increase the radial rigidity of the container. It is increasing.
JP 2001-341717 A

  Many conventional containers have a conical shape or a bowl shape that curves outwardly of the container, which reduces the degree of freedom in designing the container. Moreover, since the conventional container has a circumferential concave rib, when the film (for example, shrink film) is used as the exterior, the shape of the circumferential concave rib is raised on the film, and the degree of freedom in design is similarly reduced. Therefore, there was a problem that the design was restricted.

  Further, when an empty container is transported by a transport device in a factory, there is a problem that a highly rigid circumferential concave rib collides with an adjacent container to cause the container to be recessed. Further, after the beverage container is filled with the content liquid and the cap is attached, the beverage container is packed in a cardboard box for transportation and shipped to the market. Since the cardboard boxes are stacked during transportation, a vertical compression load in the axial direction is applied to the container packed in the cardboard boxes. When a vertical compressive load is applied in the axial direction to a conventional container having a circumferential concave rib, the circumferential concave rib portion is expanded from the inside of the container to expand. Therefore, there has been a problem that a phenomenon that the side surface of the cardboard box swells in the lateral direction due to the expansion of the container, that is, a so-called “body bulge” occurs.

The container which concerns on this invention aims at improving the visual aesthetics of a container while providing the shape of the shoulder part different from the shoulder part of the conventional container with respect to said subject.
Another object of the container of the present invention is to improve the visual aesthetics of the container while eliminating the circumferential ribs.

  The container according to the present invention is a container having a body part and a shoulder part gradually reduced in diameter as it goes upward from the upper end part of the body part. And a second bending portion that is connected to the first bending portion and the body portion in the axial cross section of the container and curves to the outside of the container.

  In many cases, the shoulder portion of a conventional container has a bowl-like shape curved outward from the container. However, since the container according to the present invention includes the first curved portion that curves to the inside of the container, it provides a shoulder shape that is not found in conventional containers.

  Further, stress concentration due to the vertical compressive load occurs in the joint portion of the shoulder portion and the trunk portion, and the joint portion of the shoulder portion and the trunk portion may be buckled. However, the container according to the present invention includes a second curved part that connects the first curved part and the body part and curves outward of the container. Therefore, the stress concentration due to the vertical compressive load is relieved, for example, at the joint portion between the shoulder and the trunk. Therefore, the shape of the container is maintained by the second curved portion, and the container is prevented from buckling due to external pressure. Therefore, the circumferential concave rib provided in many conventional containers becomes unnecessary.

  In addition, when a vertical compressive load is applied to a container having a conventional circumferential concave rib, the load deforms the circumferential concave rib, and the vicinity of the circumferential concave rib expands radially outward, so that the container expands in the width direction of the container. The amount gets bigger. For this reason, it has become a cause for the occurrence of a blister on the side surface of the cardboard box packed with a plurality of containers. However, since the container according to the present invention can eliminate the circumferential concave rib, the amount of expansion in the width direction of the container is smaller than the case where the vicinity of the circumferential concave rib expands, and the side wall of the cardboard box is reduced. It is possible to prevent the crack.

  The container according to the present invention has an upper buffer portion having higher elasticity than the upper end portion of the trunk portion in the vicinity of the upper end portion of the trunk portion, and higher elasticity than the lower end portion of the trunk portion in the vicinity of the lower end of the trunk portion. At least one of the lower buffer section is provided. Since the container according to the present invention includes either one of the upper buffer part having high elasticity or the lower buffer part having high elasticity, when the container is transported before filling the content liquid, the container is adjacent to the adjacent container. Even in the case of a collision, there is an effect that it is difficult to cause deformation of the container, for example, a dent. In the case where the peripheral rib is provided and the rigidity is increased as in the case of the conventional container, when the collision occurs and the deformation occurs, the deformation may not be restored. In the container according to the present invention, an upper buffer part or a lower buffer part having high elasticity is provided in a portion that collides with an adjacent container so that the deformation is restored by the elasticity of the container even if the deformation occurs due to the collision. That is, since the upper buffer portion and the lower buffer portion that collide with the adjacent containers have lower strength than the upper end portion or the lower end portion of the body portion, the shock is absorbed (buffered) by deformation at the time of the collision. However, since the upper buffer portion and the lower buffer portion have elasticity, the deformation at the time of collision easily returns to the original, and as a result, the container is hardly deformed.

  In the container according to the present invention, a plurality of grooves are formed perpendicular to the circumferential direction of the shoulder at least at a part of the shoulder. In the container according to the present invention, a plurality of grooves are formed on the peripheral surface of the shoulder portion. Therefore, light from the outside is diffusely reflected to change the appearance of the container and the content liquid. That is, the design of the container is enhanced, and the contents liquid is displayed vividly and the visual aesthetics are improved.

  The body part of the container according to the present invention further includes a reduced pressure absorption part, and an inclined part inclined in the axial direction of the container from the circumferential surface of the body part toward the radially inner side of the container at both longitudinal ends of the reduced pressure absorption part. It comprises. Since the body part of the container according to the present invention has inclined parts that are inclined from the peripheral surface of the body part at both ends of the reduced pressure absorption part, a gentle crease is formed around the reduced pressure absorption part in the film wound around the container. This produces the effect of improving the visual aesthetics of the container.

  In the container according to the present invention, a part of the film wound around the container is supported by a ridge line between two vacuum absorbing parts adjacent to each other. Since the film is linearly supported by the ridgeline, the portion that adheres to the film is reduced, the generation of wrinkles is reduced, and the shape of the vacuum absorbing portion is prevented from being raised on the film, thereby improving the aesthetics of the container. Play.

  In the container according to the present invention, the radius of curvature of the first curved portion and the radius of curvature of the second curved portion are substantially equal to each other. Since the curvature radius of the first curved portion and the curvature radius of the second curved portion are substantially equal, a curved surface having symmetry is formed with respect to a portion connecting the first curved portion and the second curved portion. And improve the visual aesthetics of the container. In particular, when the first curved portion or the second curved portion is configured with a plurality of curvature radii, the first curved portion and the second curved portion are configured with substantially equal curvature radii at a portion connecting the first curved portion and the second curved portion. Then, a curved surface having a clearer symmetry is formed.

  Embodiments of a container according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a schematic configuration of a container according to the present embodiment. FIG. 2 is a cross-sectional view of the container according to the present embodiment showing a cross-section taken along line CC of FIG. 3 is an axial cross-sectional view of the container according to the present embodiment, FIG. 3 (a) is an axial cross-sectional view showing a cross section along line BB shown in FIG. 2, and FIG. 3 (b) is a cross-sectional view of FIG. It is an axial sectional view showing a section of line DD. FIG. 4 is a perspective view of the container according to the present embodiment. FIG. 5 is a view showing another example of the shoulder portion of the container according to the present embodiment, FIG. 5 (a) is a view in which the shoulder groove portion is formed obliquely, and FIG. 5 (b) is a view showing the shoulder groove portion of the shoulder portion. The figure formed to the middle height, FIG.5 (c) is the figure which added and formed the horizontal rib in the middle of the shoulder part. 6 is a partially enlarged sectional view of the container, FIG. 6 (a) is a partially enlarged sectional view of the container of the comparative example, and FIG. 6 (b) is a partially enlarged sectional view of the container according to the present embodiment. .

  As shown in FIG. 1, the container 10 according to the present embodiment includes a barrel 40 that accommodates most of the content liquid, a shoulder 30 that is gradually reduced in diameter from the upper end of the barrel 40 upward, The neck portion 20 is connected to the upper end portion of the shoulder portion 30 and extends upward, and the bottom portion 50 closes the lower end portion of the trunk portion 40. A mouth portion 22 for pouring the content liquid into the container 10 is formed at the upper end of the neck portion 20, and a cap (not shown) is screwed onto a male screw portion 24 formed on the neck portion 20 to close the mouth portion 22. The cross section of the container 10 is generally circular, and the neck portion 20, the shoulder portion 30, the trunk portion 40, and the bottom portion 50 are integrally formed on the same axis with a synthetic resin such as PET. After the container 10 is filled with the content liquid and the cap is screwed, an exterior film (not shown) is wound around the film application location 70.

  The shape of the shoulder 30 of the container 10 according to the present embodiment will be described with reference to FIGS. As shown in FIG. 1, the shoulder portion 30 of the container 10 according to the present embodiment is connected to the body portion 40 at the lower end portion, and is not provided with circumferential concave ribs often found in conventional containers. Further, the shoulder portion 30 is gradually reduced in diameter from the diameter of the body portion 40 to approximately the diameter of the neck portion 20 as it goes upward, and is connected to the neck portion 20 at the upper end portion. On the peripheral surface 32 of the shoulder 30, a first curved portion 38 that is curved inside the container 10 in the axial section of the container 10 is formed. In other words, it can be said that the shoulder portion 30 has a substantially truncated cone shape, but the peripheral surface 32 of the shoulder portion 30 includes a first curved portion 38 bent toward the inside of the container 10. That is, as shown in the perspective view of FIG. 4, the container 10 according to the present embodiment is a cylindrical container formed so that the peripheral surface of the shoulder is recessed inward.

  The first bending portion 38 will be described with reference to FIG. As shown in the axial sectional view of FIG. 3A, the first curved portion 38 is curved inward of the container according to a curve defined by a predetermined curvature radius. A first radius of curvature 80 indicating a part of the first curved portion 38 according to the present embodiment is 40 mm (R40). The first radius of curvature 80 may be a length not less than 5 mm (R5) and not more than the diameter of the container 10, and desirably has a length in the range of ½ to 2/3 of the diameter of the container 10. In the container 10 of the present embodiment, the first radius of curvature 80 is 40 mm (R40), which is approximately 60% of the length 66.1 mm of the diameter E of the container 10, but may be 10 mm (R10). 45 mm (R45) may be used.

  Next, the second bending portion 39 will be described. The first curved portion 38 and the body portion 40 of the container 10 according to the present embodiment are connected by a second curved portion 39. The second curved portion 39 is formed so as to curve outward of the container 10 in the axial cross section of the container. In the axial cross-sectional view shown in FIG. 3A, the second radius of curvature 82 showing a part of the second curved portion 39 is 40 mm (R40). Similarly to the first curvature radius 80 of the first curved portion 38, the second curvature radius 82 may be a length that is not less than 5 mm (R5) and not more than the diameter of the container, and preferably the diameter of the container 10. A length in the range from 1/2 to 2/3 is good. In the container 10 of the present embodiment, the second radius of curvature 82 is 40 mm (R40), which is approximately 60% of the length 66.1 mm of the diameter E of the container 10. Similarly to the first curvature radius 80, the second curvature radius 82 may be 10 mm (R10) or 45 mm (R45).

  In the present embodiment, the first curvature radius 80 and the second curvature radius 82 are 40 mm. When the first curvature radius 80 and the second curvature radius 82 have substantially the same length, a portion 37 where the first curved portion 38 and the second curved portion 39 are connected to the peripheral surface 32 constituting the shoulder portion 30. Can be a curved surface that is symmetrical with respect to the container, improving the visual aesthetics of the container. As a matter of course, the first curvature radius 80 and the second curvature radius 82 may have different lengths. For example, the first curvature radius 80 may be 35 mm (R35), and the second curvature radius 82 may be 45 mm (R45).

  Next, the intensity | strength with respect to the vertical compression load applied to the container 10 which concerns on this Embodiment in the axial direction is demonstrated. The container 10 according to the present embodiment is, for example, a direction along the first curved portion 38 when a vertical compressive load in the axial direction is applied from above the container 10 (in the direction of arrow A in FIG. 1) (see FIG. 1 (in the direction of arrow F), stress concentration due to the vertical compressive load occurs at the joint portion of the shoulder portion 30 and the trunk portion 40, and the joint portion of the shoulder portion 30 and the trunk portion 40 may buckle. There is sex. However, since the container 10 according to the present embodiment includes the second curved portion 39 that connects the first curved portion 38 and the body portion 40 and curves to the outside of the container 10, the stress due to the vertical compressive load is provided. Concentration is relieved, for example, at the connecting portion of the shoulder 30 and the trunk 40. Therefore, the shape of the container is maintained by the second curved portion 39, and the container is prevented from buckling due to external pressure.

  In addition, when the container 10 having the conventional circumferentially concave rib is subjected to a vertical compressive load, the load deforms the circumferentially concave rib and the vicinity of the circumferentially concave rib expands radially outward. The amount that expands increases. For this reason, it has become a cause for the occurrence of a blister on the side surface of the cardboard box packed with a plurality of containers. However, since the container according to the present embodiment does not include the circumferential concave rib, the amount of expansion in the width direction of the container is small as compared with the case where the vicinity of the circumferential concave rib expands, and the side barrel of the cardboard box is reduced. It is possible to prevent blisters.

  Next, the shoulder groove part 36 formed in the shoulder part 30 is demonstrated using FIG. In the container 10 according to the present embodiment, a plurality of elongated groove shoulder grooves 36 are formed on the peripheral surface 32 of the shoulder 30. In the present embodiment, 24 shoulder groove portions 36 are formed along the shoulder portion 30 perpendicular to the circumferential direction on the peripheral surface 32 of the shoulder portion 30.

  Moreover, the cross section of each shoulder groove part 36 is formed in V shape. When the cross section of the shoulder groove portion 36 has a V-shape, light from the outside is diffusely reflected to improve the visual aesthetics of the container. The cross section of the shoulder groove portion 36 may be a shape other than the V-shape, for example, a U-shaped or concave groove.

  The arrangement of the shoulder groove 36 will be described with reference to FIGS. 1 and 5. As shown in FIG. 1, in the present embodiment, the shoulder groove portion 36 is connected to the trunk portion 40 at the lower end portion of the shoulder portion 30 from the portion connected to the neck portion 20 at the upper end portion of the shoulder portion 30. Part is formed. By forming the shoulder groove portion 36, the light from the outside is diffusely reflected, and the light is reflected from various angles to the person who sees the light. In particular, since the shoulder portion 30 is in the vicinity of the neck portion 20 from which the content liquid is poured out, the shoulder portion 30 is easily caught by human eyes. Therefore, decorating the shoulder of the container with a groove enhances the design of the container and makes the content liquid show vividly.

  The shoulder groove 36 in FIG. 1 is formed so as to be perpendicular to the circumferential direction of the container 10, but in another embodiment, for example, as shown in FIG. You may form the shoulder groove part 36 so that it may become a diagonal direction. Further, as shown in FIG. 5B, the shoulder groove portion 36 is not formed on the entire circumferential surface 32 of the shoulder portion 30, but is formed from an intermediate point of the circumferential surface 32 to the lower end of the shoulder portion 30. May be. Further, as shown in FIG. 5C, ribs 84 may be added to the peripheral surface 32 of the shoulder 30 in the lateral direction in addition to the shoulder groove 36 in the vertical direction.

  The formation of the groove up to the connecting portion 34 between the shoulder portion 30 and the body portion 40 increases the strength of the connecting portion 34, so the shoulder groove portion 36 should reach the lower end portion of the shoulder portion 30, that is, the upper end portion of the body portion 40. desirable. The shoulder groove portion 36 of the container 10 of the present embodiment is further formed so as to be continuous with the upper groove portion 72 at the upper end portion of the body portion 40 described later. However, if sufficient strength is ensured by the curved surface of the second curved portion 39, the shoulder groove portion 36 may not be formed in the second curved portion 39.

  Next, the trunk | drum 40 of the container 10 of this Embodiment is demonstrated using FIG. As shown in FIG. 1, the body portion 40 is a portion that accommodates most of the liquid content of the container 10, and the lower end is closed by the bottom portion 50. The body part 40 is mainly composed of three parts, that is, an upper buffer part 42, a reduced pressure absorbing part 44 and a lower buffer part 46.

  The upper buffer part 42 and the lower buffer part 46 are parts that buffer the collision when the container collides with an adjacent container when the container 10 is transported before filling the content liquid. In order to buffer the collision, the upper buffer portion 42 and the lower buffer portion 46 are provided in the vicinity of the maximum outer diameter of the container 10 so as to have higher elasticity than other portions (for example, the shoulder portion 30 and the bottom portion 50). Is formed. Therefore, although the upper buffer part 42 and the lower buffer part 46 are easily deformed even when the content liquid is in the container 10, the upper buffer part 42 and the lower buffer part 46 are easily returned to the original state after absorbing the impact. The upper buffer part 42 and the lower buffer part 46 are formed, for example, by reducing the thickness compared to other parts. Or you may form by eliminating a groove | channel or an unevenness | corrugation.

  The upper buffer part 42 has an upper groove part 72 extending downward from the upper end part of the upper buffer part 42. The upper groove 72 is formed continuously from the shoulder groove 36 of the shoulder 30. The cross section of each upper groove portion 72 is V-shaped like the shoulder groove portion 36, and the upper groove portion 72 becomes shallower as it extends downward. Since the upper buffer part 42 is formed with the upper groove part 72, the upper end part of the upper buffer part 42 has high strength. However, since the depth of the upper groove portion 72 does not become shallower as it extends downward, the strength near the center of the upper buffer portion 42 without the groove is lower than the upper end portion and is easily deformed.

  Similar to the upper buffer portion 42, the lower buffer portion 46 has a lower groove portion 74 extending upward from the lower end portion of the lower buffer portion 46. The lower groove 74 has a V-shaped cross section like the upper groove 72, and the depth becomes shallower as it extends upward. Since the lower groove portion 74 is formed at the lower end portion of the lower buffer portion 46, the strength is high. However, since the groove does not become shallow near the center of the lower buffer portion 46, the strength is low and the groove is easily deformed. Therefore, even if the lower buffer part 46 is deformed near the center of the lower buffer part 46 due to a collision, it can be easily restored by elasticity. That is, even if adjacent containers collide during transportation, deformation of the container 10 is prevented.

  Next, the reduced pressure absorption unit 44 will be described with reference to FIGS. 1 and 2. When the internal pressure of the container 10 decreases, the reduced pressure absorbing portion 44 is gently deformed radially inward of the container 10 to absorb the decrease in pressure, and the container 10 of the present embodiment also has a conventional structure. Similar to the container, the body 40 has a reduced pressure absorbing portion 44 that is recessed inside the container. The container 10 includes eight decompression absorption parts 44, and the desorption part 44 absorbs the pressure from the inside of the container by being deformed according to the pressure from the inside. Each decompression absorption part 44 has a decompression absorption panel 60 that is recessed inside the container 10. Each decompression absorbing portion 44 has pillar portions 62 at both left and right ends of the decompression absorbing panel 60, and is formed to have a mountain shape radially outward along with the pillar portions 62 of the decompression absorbing portions 44 adjacent to each other. 42 is supported. FIG. 2 shows a cross-sectional view taken along line CC in FIG. The eight vacuum absorption parts 44 have a substantially regular octagonal cross section, and the vacuum absorption panel 60 is recessed inward in the radial direction of the container 10. When the internal pressure of the container 10 decreases, the reduced pressure absorption panel 60 absorbs the decrease in pressure by being further recessed inside the container 10.

  Next, the inclined part 66 which inclines in the longitudinal direction both ends of the decompression absorption part 44 is demonstrated using FIG. 1 and FIG. In the case of a conventional container filled with a high-temperature content liquid, in order to secure a sufficient amount of deformation, the vacuum absorbing panel is held by being recessed at both ends having a steep angle (for example, 45 degrees or more). There are many. However, a container in which the vacuum absorption panel is recessed by both ends having a steep angle, for example, when a film is wound around the container, causes a clear crease at the connecting portion of the vacuum absorption panel, Easy to lose aesthetics. As shown in FIG. 1, the container 10 in the present embodiment is inclined toward the radially inner side of the container 10 in the axial direction of the container 10 from the circumferential surface of the body 40 at both longitudinal ends of the reduced pressure absorbing portion 44. An upper inclined portion 66 and a lower inclined portion 68 (an example of an inclined portion) are provided. The inclination angle formed by the upper inclined portion 66 and the axis of the container 10 is, for example, 15 degrees or less, and preferably 10 degrees or less. Similarly, the inclination angle formed by the lower inclined portion 68 and the axis of the container 10 is 15 degrees or less, preferably 10 degrees or less. As shown in FIG. 3A, the reduced pressure absorption panel 60 is gently connected to the peripheral surface of the body 40 by the upper inclined portion 66 and the lower inclined portion 68. By inclining both ends of the reduced pressure absorbing portion 44 and connecting to the peripheral surface of the body portion, the crease at the boundary portion of the reduced pressure absorbing portion 44 generated when the film is wound is made gentle, and the aesthetics of the container is increased. Prevent damage.

  The ridgeline 64 will be described with reference to FIGS. 1 and 3. As shown in FIG. 1, each reduced pressure absorbing portion 44 forms a ridge line 64 at a portion where two adjacent reduced pressure absorbing portions 44 are connected. In the conventional container, two adjacent vacuum absorbing parts were connected via a planar pillar, but the film is supported by the planar pillar, so the shape of the pillar can be identified through the film. It was. In the container 10 according to the present embodiment, a portion connecting each vacuum absorbing portion 44 is configured by a ridge line 64, and the film to be wound is supported in a linear shape, so that the vacuum absorbing portion 44 or the column portion 62 that floats on the film. The shape is inconspicuous. Moreover, as shown in FIG.3 (b), the part of the ridgeline 64 has almost no dent, and when the film is wound around the film sticking location 70, the trunk | drum 40 of the container 10 will become substantially cylindrical shape. Therefore, there are no restrictions on the design of the container 10 and the design of the film, and the degree of freedom is increased.

  The vertical compressive strength in the axial direction of the container 10 according to the present embodiment will be described below with reference to FIG. In order to show the superiority of the strength of the container 10 according to the present embodiment with respect to the vertical compressive load in the axial direction, the container 10 according to the present embodiment (hereinafter referred to as “Example 1”) and the second curved portion A vertical compressive load in the axial direction was applied to a container 10a (hereinafter referred to as “Example 2”) formed with a relatively small radius of curvature, and the buckling loads of both containers were measured. FIG. 6 is a cross-sectional view showing a cross section around the shoulder portion of the measured container, and FIG. 6A is an enlarged cross-sectional view around the shoulder portion of the container 10 (Example 1) of the present embodiment, FIG. ) Is an enlarged cross-sectional view around the shoulder of the container 10a of Example 2.

  As shown in FIG. 6A, the container 10 according to the first embodiment includes a first curved portion 38 that curves toward the inside of the container 10 on the peripheral surface 32 of the shoulder portion 30, and a first curved shape. A second curved portion 39 that is connected to the portion 38 and the body portion 40 and is curved to the outside of the container 10 is provided. A part of curvature radius (first curvature radius 80) showing the first curved portion 38 is 40 mm (R40), and a part of curvature radius showing the second curved portion 39 (second curvature radius 82a). Is 40 mm (R40).

  The difference between the container 10a of the second embodiment and the container 10 of the first embodiment is the size of the radius of curvature of the second curved portion 39a that is curved outward in the shoulder portion 30. As shown in FIG. 6B, the container 10a according to the second embodiment includes a first curved portion 38a that is curved inside the container 10a in the shoulder portion 30a. A part of the curvature radius (first curvature radius 80a) indicating the first curved portion 38a is 38 mm (R38), which is substantially the same as the first curvature radius 80a of the first embodiment. Similarly to the first embodiment, the container 10a according to the second embodiment also includes a second curved portion 39a connected to the first curved portion 38a. However, the radius of curvature (second radius of curvature 82a) of the second curved portion 39a connected to the first curved portion 38a is 5 mm (R5), and the size of the second radius of curvature 82 of Example 1 is 40 mm. Smaller than (R40). That is, it can be said that the shoulder part 30a and the trunk | drum 40a are connected in Example 2 by the curved surface by a small curve compared with Example 1. FIG.

Both the container 10 of Example 1 and the container 10a of Example 2 are made as a plastic bottle by blow-molding a preform having a weight of 23.8 g. Therefore, the thickness (wall thickness) of either one of the containers is not large.
After the container 10 of Example 1 and the container 10a of Example 2 were filled with 500 ml of water, an axial compressive load was applied to each container, and a buckling load was measured. For the measurement of the buckling load, the buckling load of 10 containers is measured and the average value is calculated. As a result, the vertical compressive strength of the container 10 of Example 1 was 350 N, and the vertical compressive strength of the container 10 a of Example 2 was 270 N (Newton).

  As the measurement results show, when both containers are made by blow molding using a preform having a weight of 23.8 g, a curved surface with a large curvature is formed in the second curved portion 39, and the first curved portion 38 and It can be seen that the connected Example 1 has a higher vertical compressive strength in the axial direction than the Example 2 in which a curved surface having a small curvature is formed and connected to the first curved portion 38a. That is, when the thickness (wall thickness) of the wall forming the container is constant, it is possible to form a relatively large curve on the outside of the container and connect the first curved part and the trunk part to the shoulder part. There is an effect of increasing the strength of the connecting portion between the body and the body.

  As will be apparent to those skilled in the art, the above description should only be construed as an example showing how the invention may be implemented. In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

It is a schematic block diagram which shows schematic structure of the container which concerns on this invention. It is a cross-sectional view of the container which concerns on this Embodiment which shows the cross section of CC line of FIG. FIG. 3A is an axial cross-sectional view of the container according to the present embodiment, FIG. 3A is an axial cross-sectional view showing a cross section taken along line BB in FIG. 2, and FIG. It is an axial sectional view showing a section of line D. It is a perspective view of the container which concerns on this Embodiment. It is a figure which shows the other example of the shoulder part of the container which concerns on this Embodiment, FIG. 5 (a) is the figure which formed the shoulder groove part diagonally, FIG.5 (b) is the height in the middle of a shoulder part. FIG. 5C is a view formed by adding a lateral rib in the middle of the shoulder portion. 6A is a partially enlarged cross-sectional view of the container of Example 1, and FIG. 6B is a partially enlarged cross-sectional view of the container of Example 2.

Explanation of symbols

10 bottles (example of container)
20 neck portion 22 mouth portion 24 male screw portion 30 shoulder portion 32 shoulder peripheral surface 34 connecting portion 36 shoulder groove portion 37 connecting portion between the first bending portion and the second bending portion 38 first bending portion 39 second bending portion 40 trunk 42 upper buffer 44 lower pressure absorber 46 lower buffer 50 bottom 60 vacuum absorber panel 62 pillar 64 ridge 66 upper slope 68 lower slope 70 film attachment location 72 upper groove 74 lower groove 80 first radius of curvature 82 Second radius of curvature 84 Ribs

Claims (6)

In a container having a trunk part and a shoulder part gradually reduced in diameter as it goes upward from the upper end part of the trunk part,
A first curved portion formed on the shoulder in the axial cross section of the container and curved inward of the container;
A container comprising: a second curved part that connects the first curved part and the body part in a cross section in the axial direction of the container and curves to the outside of the container.   An upper buffer portion having higher elasticity than the upper end portion of the barrel portion near the upper end of the barrel portion, and a lower buffer portion having higher elasticity than the lower end portion of the barrel portion near the lower end of the barrel portion. The container of Claim 1 which comprises at least any one of these.   The container according to claim 1 or 2, wherein a plurality of grooves are formed in at least a part of the shoulder portion perpendicularly to a circumferential direction of the shoulder portion. Furthermore, the body part includes a reduced pressure absorption part,
The inclined part which inclines toward the radial inside of the said container in the axial direction of a container in the axial direction of a container from the peripheral surface of the said trunk | drum in the longitudinal direction both ends of the said decompression | absorption absorption part. The container according to crab.   The container according to claim 4, wherein at least a part of the film wound around the container is supported by a ridge line between the two vacuum absorbing portions adjacent to each other.   The container according to any one of claims 1 to 5, wherein a radius of curvature of the first curved portion and a radius of curvature of the second curved portion are substantially equal to each other.

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