JPH0540116U - Biaxially stretch blow molded polyester resin container - Google Patents

Abstract

(57) [Summary] [Purpose] A biaxially stretch blow-molded container is filled with a heated liquid material, and the reduced pressure generated in the container after cooling is absorbed to prevent unauthorized deformation. [Structure] A constricted portion is provided above the center of the body of a biaxially stretch-blow molded resin container, and the center of the body below the constricted portion is slightly expanded outwardly to form a cylindrical shape, which is vertically elongated. In addition, a plurality of grooves of rectangular pyramidal convex portions having a curved surface with a wide vertical cross section are provided in parallel at equal intervals to form a deformation absorbing portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a biaxially stretch blow molded polyester resin container made of a synthetic resin such as a polyester resin filled with soft drink.

[0002]

[Prior Art]

 Synthetic resin containers made of polyester resin have been used as bottle-shaped containers for soft drinks such as oolong tea, black tea and fruit juice drinks. As a widely-used molding method for this container, there is a method in which a primary molded product molded from a crystalline synthetic resin is molded into a container by biaxial stretching. In particular, among synthetic resins, polyethylene terephthalate resin containers are said to be thin and lightweight by biaxial stretch molding, have excellent mechanical strength, have gas barrier properties, and can be mass-produced at low cost. There is an advantage to say.

By the way, the liquid to be filled in this kind of container is often heat-sterilized and filled, and when the container is filled with the liquid and sealed and then cooled, the inside of the container becomes negative pressure. Then, due to the negative pressure generated inside the container, the body portion of the container is deformed under reduced pressure, resulting in an unfavorable appearance. Therefore, as a means for solving this problem, it has been proposed to provide a plurality of vertically long flat portions on the body of the container to absorb negative pressure and prevent unauthorized deformation (Japanese Utility Model Publication No. 54-30654). Gazette, Japanese Utility Model Publication No. 56-109905).

A method for preventing unauthorized deformation of these containers is that a negative pressure is generated in the container by adopting a structure in which a plurality of vertically long flat plates are arranged at equal intervals along the circumferential direction on the body of the container. When it occurs, the flat part collapses inward and absorbs the reduced pressure, so that it is designed so as to avoid deformation that impairs the aesthetics of the container.

[0005]

However, in the above-described conventional technique, the negative pressure generated in the container due to the inward deformation of each flat portion of the container is absorbed. Since the deformation to the structure is such that only the flat part is deformed without causing extensional deformation, there is a drawback in that it is difficult for depression deformation to occur and the entire body part is deformed.

[0006]

[Means for Solving the Problems]

 The present invention has been devised to solve such a drawback, and in order to absorb the negative pressure generated in the container by deformation, the body part is slightly bulged outward from the container and a convex part is formed inside the container. The purpose of this structure is to absorb negative pressure reliably by providing a structure in which a plurality of vertically elongated grooves having the above are provided at equal intervals to facilitate depression deformation.

[0007]

[Means for Solving the Problems]

 That is, the present invention relates to a biaxially stretch blow-molded container made of polyester resin, in which a waist (6) forming a ridge is provided above the center of the body (2) of the container (1). Below the constricted part (6), the body part (2) is vertically elongated in a part that bulges outwardly of the container and has a wide vertical cross section, and a rectangular pyramidal convex part (5) is formed inward of the container. The present invention is characterized by a biaxially stretched blow molded polyester resin container having a plurality of deformation absorbing parts (3) provided in parallel at equal intervals.

[0008]

[Action and Example]

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of the present invention, in which a container 1 has a structure including a body portion 2 connected to a mouth / neck portion 7 and a bottom portion 8. The body 2 is provided with a constricted portion 6 forming a ridge in the upper center thereof, and the lower body 2 has a plurality of deformation absorbing portions 3 arranged at equal intervals in a portion slightly bulged outward of the container. Specifically, the number is 4 to 9, preferably 6 to 7.

Next, the deformation absorbing portions 3 arranged in the body portion 2 are provided at positions facing the circumferential direction of the body portion 2 in the even number, and arranged in the circumferential direction of the body portion 2 in the odd number. It is provided in the intermediate portion between the deformation absorbing portions 3 facing each other, but any of them may be used.

Further, in the deformation absorbing portion 3, the groove portion 4 is configured to be vertically long and wide in the vertical direction of the body portion 2, and the groove portion 4 has a vertical cross section showing a part of the front view of FIG. 1 as shown in FIG. A rectangular pyramid shape is formed inwardly of the container 1 to form a convex portion 5 at approximately the center of the groove portion 4.

According to the present invention, a substantially circular truncated cone portion that is smooth in the circumferential direction is provided above the constricted portion 6 of the body portion 2 and can function as a label attaching portion or a heat shrink film attaching portion. .

As described above, in the container of the present invention, the body 2 is formed with the groove 4 forming the plurality of rectangular pyramid-shaped protrusions 5 as the deformation absorbing portion 3, so that the container is filled with the high temperature liquid and sealed. The negative pressure generated when the liquid is cooled after that can absorb the reduced pressure by causing the entire groove portion 4 provided as the deformation absorbing portion 3 to uniformly deform inward toward the inside of the container 1. The slightly bulged part of the body functions to keep the shape of the container against collapse deformation.

[0013]

[Effect of the device]

 As described above, according to the present invention, since the container as described above is provided with the plurality of deformation absorbing portions, the deformation absorbing portion evenly absorbs the negative pressure generated in the container. With, the decompression deformation is hardly visible as an external appearance, and the aesthetic appearance as a container can be maintained.

[Brief description of drawings]

FIG. 1 is a front view showing the entire container of the present invention.

FIG. 2 is a vertical cross-sectional view showing a part of the body of the front view of FIG. 1 of the present invention.

[Explanation of symbols]

 1 Container 2 Body 3 Deformation Absorber 4 Groove 5 Convex 6 Constriction 7 Mouth Neck 8 Bottom

Claims (1)

[Scope of utility model registration request] 1. A container made of a biaxially stretch blow molded polyester resin, wherein a constricted part (6) forming a peripheral line is provided above the center of a body part (2) of the container (1), and the constricted part is formed. Below (6), the body (2) is a groove (4) forming a rectangular pyramid-shaped convex (5) inward of the container with a vertically long and wide vertical cross section at a portion slightly bulged outward of the container. A biaxially stretch blow molded polyester resin container having a plurality of deformation absorbing portions (3) arranged in parallel at equal intervals.