JP-2026075984-A - synthetic resin bottle

Abstract

[Problem] To provide a synthetic resin bottle that, even with a thin-walled and lightweight design, undergoes balanced deformation under reduced pressure throughout the entire bottle, reducing deformation of the container's appearance before and after opening, and allowing the label wrapped around the body to make uniform contact with the bottle, resulting in a good appearance. [Solution] A synthetic resin bottle having a shoulder portion, a body portion, and a bottom portion, wherein the body portion has a plurality of columnar portions extending in the height direction of the bottle and a plurality of pressure absorption panels located between the columnar portions, arranged alternately in the circumferential direction, the horizontal cross section of the body portion forming a substantially polygonal shape with the plurality of columnar portions as vertices, the horizontal cross section of the body portion having a curved shape that is convex outward from the bottle, the pressure absorption panels having a curved shape that is convex outward from the bottle, the body portion having a shape that is recessed inward from the bottle in the height direction of the bottle, and the width of the columnar portions in the circumferential direction of the bottle being wider at the top and bottom. [Selection Diagram] Figure 1

Inventors

• 山崎 和也
• 石川 将
• 斎藤 要

Assignees

• メビウスパッケージング株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (6)

1. In a synthetic resin bottle having shoulders, a body, and a bottom, The body of the bottle has multiple columnar sections extending in the height direction of the bottle, and multiple pressure absorption panels located between the columnar sections, arranged alternately in the circumferential direction, so that the horizontal cross-section of the body of the bottle forms a substantially polygonal shape with the multiple columnar sections as vertices. In the horizontal cross-section of the body, the column portion is curved and convex outward from the bottle, and the pressure absorption panel is curved and convex outward from the bottle. A synthetic resin bottle characterized in that the pressure absorption panel has a shape that is recessed inward in the bottle in the bottle height direction of the body, and the width of the column in the bottle circumferential direction is wider at the top and bottom.
2. The synthetic resin bottle according to claim 1, wherein the apex of the column is curved or straight, convex outward in the bottle height direction.
3. The synthetic resin bottle according to claim 1 or 2, wherein the body consists of an upper body and a lower body, the upper body has a flared shape with its diameter increasing towards the shoulder, and the lower body has a flared shape with its diameter increasing towards the bottom.
4. The synthetic resin bottle according to claim 3, wherein the column portion and the pressure absorption panel are formed in the upper body portion.
5. A synthetic resin bottle according to claim 3, wherein a groove extending in the circumferential direction is formed between the upper and lower body portions.
6. The synthetic resin bottle according to claim 1, wherein the horizontal cross-section of the shoulder portion is circular.

Description

This invention relates to a synthetic resin bottle having a vacuum absorption panel, and more specifically, to a synthetic resin bottle that is thin-walled and lightweight, yet exhibits excellent appearance characteristics with minimal deformation before and after vacuuming. Hollow containers made of synthetic resin are widely used as packaging containers for various liquids due to their excellent lightness and impact resistance. In particular, hollow containers made by stretch-blow molding polyethylene terephthalate (PET bottles) are widely used as packaging containers for liquid contents because they offer excellent transparency, gas barrier properties, lightness, and impact resistance, as well as appropriate rigidity. Hot filling of contents is a common practice in polyester bottles to improve their shelf life. However, after hot filling, the volume contraction of the contents due to cooling causes pressure deformation of the container. To prevent this, the bottom of the bottle is formed into a dome shape capable of absorbing pressure, and the bottle body is provided with alternating columnar sections extending in the height direction of the bottle and pressure-absorbing panel sections located between these columns, so that the pressure deformation is absorbed by these panel sections (Patent Document 1, etc.). In recent years, synthetic resin bottles have been made thinner and lighter from an environmental and economic standpoint. However, these thin-walled bottles suffer from significant deformation before and after depressurization, resulting in poor appearance characteristics. Furthermore, there is a desire for a simpler bottle shape with a gently sloping body, rather than a bottle with a clearly defined body containing columnar sections and depressurization absorption panels. To address these problems, Patent Document 2 describes a synthetic resin bottle characterized in that the region between the upper shoulder and lower body is formed by alternately arranging multiple pressure-absorbing surfaces and multiple columnar sections in the circumferential direction, thereby creating a substantially polygonal shape with the columnar sections as vertices in the cross-section; each columnar section is arc-shaped in cross-section with the bottle axis as the center; the region between the upper shoulder and upper body end of each columnar section has a gently curved shape that is convex outward in the longitudinal cross-section; each pressure-absorbing surface includes a surface that is convex outward in the longitudinal cross-section in the lower shoulder and upper body end regions; each pressure-absorbing surface includes a surface that is linear in the longitudinal cross-section in the region between the upper body end and lower body end; and in each pressure-absorbing surface, the surfaces in the lower shoulder and upper body end regions and the surface in the region between the upper body end and lower body end are smoothly connected. Japanese Patent Publication No. 2018-39522Patent No. 6363010 This is a side view of the synthetic resin bottle of the present invention, where (A) is a side view with the panel section in the front position and (B) is a side view with the column section in the front position.(A) is a side cross-sectional view (axial cross-section) at the position shown in Figure 1(A), and (B) is a side cross-sectional view (axial cross-section) at the position shown in Figure 1(B).(A) is a top view of the bottle shown in Figure 1, (B) is a cross-sectional view (horizontal section) along line X-X in Figure 2, and (C) is a bottom view of the bottle shown in Figure 1. The synthetic resin bottle of the present invention will be described based on the attached drawings. The synthetic resin bottle 1 of the present invention, shown in Figures 1 to 3, generally comprises a mouth portion 2, a shoulder portion 3, a body portion 4, and a bottom portion 5. In the specific example shown in the figures, a step is formed in the outer diameter direction between the shoulder portion 3 and the body portion 4. The body portion 4 is divided into an upper body portion 4a and a lower body portion 4b by an annular bead 6 extending in the circumferential direction of the bottle. The upper body portion 4a has a flared shape, with its diameter increasing towards the shoulder portion 3, while the lower body portion 4b has a flared shape, with its diameter increasing towards the bottom portion 5. The upper body portion 4a has multiple columnar sections 7, 7 extending in the bottle height direction, and multiple pressure absorption panels 8, 8 located between adjacent columnar sections 7, 7, which are alternately arranged in the circumferential direction of the bottle. The columnar sections and pressure absorption panels will be described later. The lower body portion 4b is reinforced by the formation of annular beads 9a, 9b extending in the circumferential direction of the bottle. As is clear from Figures 2 and 3(C),