JPH0735306U - Pressure resistant plastic container - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pressure-resistant plastic container for filling and sealing a pressurized liquid, the groove of which does not deform and disappear due to internal pressure when the pressurized liquid is filled and sealed in the container. . [Structure] A groove 12 formed by curving the container wall toward the inside of the container, and a ridge 13 formed in the groove 12 such that the outer surface of the container wall protrudes toward the outside of the container in the longitudinal direction of the container. And the groove 12 adjoins the container wall. Further groove 1
The outer surface of No. 2 is rough. When the internal pressure acts on the sealed container, the internal pressure causes the groove 12 to be inverted and deformed to exert a force in a direction of bending toward the outside of the container. At this time, the ridge 13 functions as a rib and the adjacent groove As a result of suppressing the deformation of the container wall in 12, the curving deformation of the container wall in the groove 12 toward the outside of the container is suppressed, and the disappearance of the groove 12 is avoided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure-resistant plastic container for containing a content liquid of a pressurized liquid such as a carbonated drink.

[0002]

[Prior art]

 Plastic containers for filling the contents of pressurized liquids such as carbonated drinks are formed by biaxial stretch blow molding or the like. As shown in FIG. 5, FIG. 6, and FIG. 7, such a plastic container has a center portion of the container 101 for the purpose of providing a characteristic line due to the requirement of external design or for improving the buckling resistance of the container. A groove 108 may be provided along line 115. The groove 108 has a shape in which the container wall 114 is curved inward of the container.

[0003]

[Problems to be solved by the device]

 However, when a plastic container having a groove with such a structure is filled with a pressurized liquid and sealed, the container wall in the groove part is inverted due to the rise of the temperature of the container and the internal pressure, and the container is curved outward. The groove disappears, the characteristic line in the design of the container disappears, or the function of preventing the buckling of the container disappears. In addition, when the groove is subjected to the reversal deformation, an intra-layer crack or delamination occurs in the wall of the container having a single-layer or multi-layer structure, and the strength of the container is reduced. As a result, the shape of the characteristic line of the container shape can be maintained in a pressure resistant container that stores pressurized liquid such as gas drink, and the deformation of the groove can be prevented to improve the buckling strength of the container. It is desired to develop a pressure resistant plastic container that can maintain the strengthening performance and can avoid delamination of the container wall.

From the above, the applicant of the present application for utility model registration has found that the container wall is formed by bending the container wall toward the inner side of the container and the container wall inside the first groove. A second groove curved outwardly is formed in the longitudinal direction of the container, and the container wall of the first groove and the container wall of the second groove are adjacent to each other. We proposed a pressure-resistant plastic container characterized by (Application for registration of utility model in 1993 No. 56775). The newly proposed pressure-resistant plastic container maintains the shape of the characteristic line and exerts a remarkable effect of improving the buckling strength, but further improvement in performance is desired.

The present invention has been made in view of the above circumstances, and in a pressure-resistant plastic container for filling and sealing a pressurized liquid, the pressurized liquid is filled and sealed in the container, and further the temperature change in the container is performed. The purpose of the present invention is to provide a groove in which the groove is not deformed and disappears.

[0006]

[Means for Solving the Problems]

 For this purpose, the pressure-resistant plastic container of the present invention has a groove formed in the longitudinal direction of the container in which the container wall is curved toward the inner side of the container, and the outer surface of the container is outward in the groove. It is characterized in that the ridges formed so as to project toward the side are formed in the longitudinal direction of the container, and the outer surface of the container is formed into a rough surface in the groove.

[0007]

[Action]

 When the internal pressure is applied to the sealed plastic container, the internal pressure causes the groove to be inverted and deformed to exert a force in the direction of bending toward the outside of the container. As a result of suppressing or mitigating the deformation of the container wall in the groove, the deformation of the container wall in the groove toward the outside of the container is prevented, and the rough surface suppresses the light reflection of the ridges. Does not spoil the appearance.

[0008]

【Example】

Hereinafter, the details of the present invention will be described with reference to the drawings illustrating one embodiment. In FIG. 1, 1 is a plastic container. The plastic container 1 has a mouth part 2, a body part 3 and a bottom part 4. The body part 3 is composed of an upper part 6, a central part 5 and a lower part 7, and the upper and lower ends of the center part 5 of the body part 3 are The diameter is slightly smaller than the lower end of the upper portion 6 and the upper end of the lower portion 7, and a groove 12 is provided in the upper portion 6 and / or the lower portion 7 or both. As shown in FIGS. 1, 2 and 3, a plurality of grooves 12 are provided in the vertical direction of the container. A ridge 13 is provided in the groove 12 in the longitudinal direction of the container. The groove 12 is formed substantially along the center line 11 of the container with the container wall curved toward the inside of the container. The groove width w ₁ is 10 mm to 3 mm, the depth h ₁ is about 6 mm to 1 mm, and the wall thickness t is 0.2 to 0. About 6 mm is desirable. A radius of curvature of 3 mm to 6 mm is formed between the outer edge of the groove 12 and the container wall 14. The ridge 13 is formed in the vicinity of the top of the groove 12 so that the container wall is curved toward the outside of the container and substantially along the center line 11 of the container.

The ridge 13 may be located at the center of the top of the groove 12 as shown in FIG. 3, or may be formed at a position slightly displaced from the center of the top of the groove 12 as shown in FIG. Good. The ridge 13 has a width w ₂ of 0.3 mm to 1.0 mm and a height h ₂ of 0.02 mm to 0.2 mm.

The outer surface of the groove 12 is a rough surface including the outer surface of the ridge 13. In order to form this rough surface, the corresponding surface of the molding die is sandblasted. The range of the container wall forming the rough surface is at least the outer surface of the ridge 13 or the outer surface of the groove 12 including the ridge 13, and the groove 12 is characterized in that the central angle θ of the container is θ = 15 ° or less. It is desirable to emphasize the lines.

In the plastic container configured as described above, when the container 1 is filled with the pressurized liquid and the internal pressure acts on the container 1, the internal pressure acts on the groove 12 to move the groove 12 to the outside. Although a force is applied in the direction of inversion bending, the internal pressure of the container also acts on the inside of the ridge 13, and the ridge 13 functions as a rigid rib to suppress the deformation of the groove 12. . As a result, the groove 12 as a whole is prevented from being curved and deformed to the outside of the container. This prevents the groove 12 from disappearing even when the internal pressure acts on the plastic container 1.

Furthermore, the outer surface of the groove 12 is rough, and the top of the ridge 13 is protruded. As a result, the characteristic line of the groove 12 does not disappear.

[0013]

[Effect of device]

 As described above, in the pressure resistant plastic container of the present invention, the deformation of the groove is suppressed or alleviated even when the liquid is pressurized and filled, and the characteristic line of the groove is prevented from disappearing. It can be sustained and the buckling strength of the container can be maintained and delamination of the container wall can be avoided.

[Brief description of drawings]

FIG. 1 is a front view of a container according to an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view of a container.

FIG. 3 is an enlarged explanatory diagram illustrating a groove portion of a container wall.

FIG. 4 is an enlarged explanatory view showing a groove portion of a plastic container according to another embodiment of the present invention.

FIG. 5 is a front view showing a conventional plastic container.

FIG. 6 is a cross-sectional explanatory view of a conventional plastic container.

FIG. 7 is an enlarged cross-sectional explanatory view of a groove portion of a conventional plastic container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic container 2 Mouth part 3 Body part 4 Bottom part 5 Central part 6 Upper part 7 Lower part 11 Center line 12 Groove 13 Convex strip 14 Container wall 15 Adjacent part 101 Container 108 Groove 114 Container wall 115 Center line

Claims (1)

[Scope of utility model registration request] 1. A ridge in which a groove formed by bending a container wall toward the inside of the container is formed in a longitudinal direction of the container, and an outer surface of the container is formed so as to project outward in the groove. Is formed in the longitudinal direction of the container, and the outer surface of the container is formed into a rough surface in the groove.