JP4894034B2 - Square resin container - Google Patents

Description

  The present invention relates to a rectangular resin container in which a trunk cross section is square and a substantially triangular reinforcing recess is provided on the upper part of the trunk.

  In a rectangular resin container made of PET resin or the like, an invention is known in which a constriction is formed at the center of the container body to increase the container strength. In general, in a resin container having heat resistance, a vacuum absorption panel is provided in a body portion so as to cope with a decrease in internal pressure due to a temperature decrease or the like.

  At present, a container (hereinafter referred to as a 1 liter container) in the form of a resin container having an internal volume of about 1000 ml and having an overall height substantially the same as a resin container having an internal capacity of 500 ml is in circulation. Such a 1 liter container is known to have an oblong shape and a rectangular shape such as a rectangular body section.

JP 2005-186996 A

  However, in the 1 liter container, if the neck for reinforcement is formed in the central part of the body, the vacuum absorption panel can be provided only on either the upper or lower side of the neck, and the vacuum absorption capacity is reduced, or the vacuum absorption panel May be divided into upper and lower portions, and sufficient vacuum absorption capacity cannot be obtained.

  Further, the reduced pressure absorption panel is often formed in a rectangular shape along the outer periphery of the container side wall, and if a rectangular reduced pressure absorption panel is provided on the side wall, a mountain-shaped flat surface may be formed on the upper side of the reduced pressure absorption panel. When such a flat surface is formed on the upper portion of the container body, strength may be reduced from the shoulder portion of the container to the upper portion of the body.

  An object of the present invention is to provide a rectangular resin container that has heat resistance, has a high vacuum absorption capacity, has a high strength at the upper portion of the trunk, and is easy to handle.

1. Resin container with a square cross section, made from PET resin as a raw material by biaxial stretch blow molding, has heat resistance that allows injection of high-temperature content liquid, and forms four sides of the body A vacuum absorbing panel is provided at least in the center of each side wall, and a flat surface formed in a mountain shape between the upper edge of the side wall located on the front and back surfaces of the resin container and the upper edge of the vacuum absorbing panel. A triangular resin concave portion was provided symmetrically with respect to the center of the body portion to constitute a rectangular resin container.

  The container is a resin container made of PET resin as a raw material, and the body section has a square cross section. In other words, the container has four planar side walls and is formed in a square shape by the four side walls. The body portion may basically be a quadrangle, and a chamfer or the like may be provided between the side walls, and the chamfered portion may be a curved surface as well as a flat surface. Molding is performed by normal biaxial stretch blow molding.

  In addition, it is preferable to make the cross-sectional aspect ratio of a trunk | drum into the value of 1: 1.15-1: 1.30.

  Having heat resistance means that the content liquid sterilized by heat is directly injected at a high temperature, and the content liquid is sealed in the container. For example, a so-called whitening process is performed on the mouth part, the bottom part has a predetermined shape, and a process is performed so as not to cause a problem due to heat even when a high-temperature content liquid is injected.

The reduced pressure absorption panel is configured by, for example, denting a part of the side wall inside the container and appropriately providing irregularities inside the recess, and the pressure generated inside the container due to the displacement of the reduced pressure absorption panel inside and outside the container. Absorb changes. The reduced pressure absorption panel was provided on all the side walls constituting the body .

A vacuum absorbing panel is provided at least in the center of each side wall. As a result, a constriction (referred to as a groove in which a part of the body part is recessed inside the container along the circumferential direction) is not formed in the middle part of the body part. Therefore, the reduced pressure absorption panel is not provided only on one side of the top and bottom of the constriction, and is not divided vertically by the constriction, thereby preventing a reduction in the area of the decompression absorption panel.

The reinforcing recess is provided on a flat surface formed in a mountain shape between the upper edge of the side wall and the upper edge of the vacuum absorbing panel .

  The reinforcing recess is formed at least on the front and back surfaces of the container so as to face the center of the container (body part). It is preferable that the outer peripheral edge of the reinforcing recess is substantially triangular, and is an isosceles triangle having a corner formed in an arc shape along the upper edge of the side wall and the upper edge of the vacuum absorbing panel. The depth of the reinforcing recess is such that when the container is held, the finger is moderately applied to the outer peripheral wall of the reinforcing recess, and the outer wall formed on the outer periphery of the reinforcing recess can secure the strength of the upper part of the trunk. To do. The inside of the reinforcing recess may be flat or curved inward of the container or outward.

  The reinforcing recess is not an isosceles triangle and may not have a shape along the upper edge of the side wall and the upper edge of the vacuum absorbing panel.

  2. The square resin container described in 1 was constructed with the container capacity of 1 liter.

  The rectangular resin container of the present invention has the following characteristics.

  A square resin container using a PET resin can be easily formed.

  Since the reduced pressure absorption panel is provided at least in the center of the side wall, the rectangular resin container has sufficient reduced pressure absorption capability. Accordingly, even when the content liquid is cooled from a high temperature state or cooled for drinking and the pressure inside the container is reduced, the reduced pressure absorption panel sufficiently absorbs the reduced pressure and does not cause deformation of the rectangular resin container.

  Since the rectangular resin container has heat resistance, it can be filled with a high temperature content liquid, sealed and sealed.

Since the outer peripheral wall of the reinforcing concave portion is bent from the side wall and is formed in a substantially triangular shape, the strength of the upper portion of the trunk portion is improved.

  An easy-to-use 1 liter square resin container can be provided.

  FIG. 1 shows the front of a rectangular resin container according to the present invention.

  The square resin container 2 is a 1 liter container made of PET resin, and includes a mouth part 4, a shoulder part 6, a trunk part 8, and a bottom part 10, and has a height of 207 mm. The rectangular resin container 2 is formed, for example, by forming a cylindrical preform from a PET resin and biaxially stretching and blowing the preform in a mold.

  The mouth portion 4 has a male screw formed on the outer peripheral surface, and a cap (not shown) is screwed together. Further, the mouth part 4 is heat-resistant by whitening treatment.

  The shoulder portion 6 connects the lower end of the mouth portion 4 and the upper portion of the trunk portion 8 with a relatively gentle slope, and includes a plurality of broken lines 12 radially on the peripheral surface. The polygonal line 12 is substantially linear, and the flat plate 13 between the polygonal line 12 and the polygonal line 12 is formed on a trapezoidal substantially flat surface.

  As shown in FIG. 2 (plan view of a rectangular resin container), the body portion 8 is formed of a side wall 9 provided on four sides and a connecting wall 11 that obliquely connects the side walls 9 through the cross section. Is approximately rectangular. The body portion 8 has an aspect ratio of the cross section, that is, a ratio of the width of the front surface (one surface of the side wall 9 having a large width) to the width of the side surface is about 1: 1.25, and has a substantially uniform thickness in the vertical direction. .

  On the front and back side walls 9 of the square resin container 2 (both have the same shape as in FIG. 1), a reduced pressure absorption panel 14 and a reinforcing recess 3 are provided, respectively.

  As shown in FIG. 5, the reduced-pressure absorption panel 14 is configured such that a part of the side wall 9 is recessed inside the rectangular resin container 2, and the recessed part is provided with unevenness, and along the periphery of the side wall 9. It is formed so as to cover substantially the entire side wall 9.

  The reinforcing recess 3 is formed on the front and back side walls 9 of the square resin container 2. The front and back side walls 9 are chevron at the top, and the reinforcing recess 3 is formed on the flat surface 7 formed in the chevron, along the two upper edges of the flat surface 7 and the upper edge of the vacuum absorbing panel 14. Thus, the base is horizontal, and is formed in an isosceles triangle symmetrical with respect to the center of the side wall 9. As shown in FIG. 5, the reinforcing recess 3 is flat inside, has an outer peripheral wall 5 on the outer periphery, and is formed at substantially the same depth as the reduced pressure absorption panel 14. The reinforcing recesses 3 formed on the front surface and the back surface of the rectangular resin container 2 are formed at the same position facing each other across the center of the rectangular resin container 2.

  As shown in FIG. 3, the side wall 9 on the side surface (the narrow side) of the rectangular resin container 2 has a vacuum absorption panel 14 along the outer periphery of the side wall 9, and a vacuum absorption panel above and below the vacuum absorption panel 14. Rectangular recesses 15 and 17 formed at a predetermined distance from 14 are provided.

  As shown in FIG. 4, the bottom portion 10 includes ribs 19 radially from the center and has predetermined heat resistance.

  Next, features of the square resin container 2 will be described.

  Since the reduced pressure absorption panel 14 is formed on each of the side walls 9 of the body portion 8 so as to cover substantially the entire surface of the side wall 9, the rectangular resin container 2 has a high reduced pressure absorption capability and is sealed in a high temperature content. Even when the liquid is cooled or cooled for drinking, the reduced pressure absorption panel 14 sufficiently absorbs the internal pressure drop and does not cause deformation.

  Since the reinforcing recesses 3 are formed facing the upper portions of the front and back side walls 9, when holding the rectangular resin container 2, fingers are placed on the steps of the reinforcing recess 3 from both sides of the rectangular resin container 2. The rectangular resin container 2 can be lifted using the reinforcing recess 3 or the liquid can be easily poured by tilting the square resin container 2.

  Moreover, since the outer peripheral wall 5 bent from the side wall 9 is formed in a substantially triangular shape along the outer peripheral edge of the reinforcing recess 3, the strength of the upper portion of the side wall 9 is improved.

  Since the aspect ratio of the cross section of the body portion 8 is about 1: 1.25, the difference between the front and side surfaces of the rectangular resin container 2 becomes clear, and can be aligned without mixing different directions. The square resin container 2 can be accurately transported along the transport path.

  Moreover, since the aspect ratio is about 1: 1.25, the circumference of the body portion 8 is not excessively long, so that the molding resin can be reduced and the square resin container 2 can be reduced in weight.

  Since the height is within the range of a so-called 500 ml plastic bottle (200 mm to 220 mm), it can be stored in the display shelf without changing the current display shelf.

  In the above embodiment, the internal volume of the rectangular resin container is 1 liter and the aspect ratio of the cross section is 1: 1.25, but the present invention is not limited to this. Furthermore, although the reinforcement recessed part 3 was made into an isosceles triangle, it is not restricted to this, Moreover, the inside does not need to be flat.

It is a front view which shows the square resin container concerning this invention. It is a top view which shows a square resin container. It is a side view which shows a square resin container. It is a bottom view which shows a square resin container. It is sectional drawing which shows a reinforcement recessed part and a reduced pressure absorption panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Square resin container 3 Reinforcement recessed part 4 Mouth part 5 Outer peripheral wall 6 Shoulder part 7 Flat surface 8 Trunk part 9 Side wall 10 Bottom part 11 Connection wall 12 Polyline 13 Flat plate 14 Decompression | absorption panel 15, 17 Depression 19 Rib

Claims (2)

It is a resin container with a square cross section,
Using PET resin as a raw material, molded by biaxial stretch blow molding,
It has heat resistance to inject high temperature content liquid,
At least the central part of each side wall forming the four side surfaces of the body part is provided with a vacuum absorbing panel,
In addition , a substantially triangular reinforcing recess is symmetrically formed with respect to the center of the trunk portion on a flat surface formed in a mountain shape between the upper edge of the side wall located on the front and back surfaces of the resin container and the upper edge of the vacuum absorbing panel. A rectangular resin container characterized by being provided in the container. The rectangular resin container according to claim 1, wherein the container is 1 liter.

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