JP4998764B2 - Square resin container - Google Patents

Description

  The present invention relates to a rectangular resin container in which a body cross section is rectangular, and an aspect ratio of the square cross section is set to a predetermined value.

  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.

  In addition, when the body cross section is a shape close to a square, that is, when the aspect ratio of the cross section is a value close to 1: 1, the outer shape of the front and side surfaces of the container are approximated. Then, it becomes difficult to distinguish between a container facing the front side and a container facing the side surface, and it is considered that containers having different directions are mixed in the transport path and the containers cannot be aligned.

  On the other hand, when the barrel is horizontally long, that is, when the aspect ratio of the cross section is increased, the circumference of the barrel becomes longer even for containers with the same internal volume, and the amount of resin used in the container increases accordingly, and the container weight also increases. To do.

  The present invention provides a square resin container that is heat-resistant, has a high vacuum absorption capacity, can be easily stored in a display shelf such as a storefront, and can be accurately transported in a filling line or the like, and is reduced in weight. For the purpose.

1. This is a resin container with a square cross section, which is formed by biaxial stretch blow molding using PET resin as a raw material, and each side wall of the container body has a dent for reinforcement, a wide front width In addition, the back surface is formed in an isosceles triangle symmetrical with respect to the center of the side wall, the rectangular side surface is formed in a rectangular shape, and covers the entire surface of all the side walls forming the four side surfaces of the body portion at the lower part of the recess. to, respectively provided vacuum panels, and a cross-section aspect ratio of the body portion, 1: 1.15 to 1: to form a rectangular resin container as the value of 1.30.

  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.

  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 is provided on all the side walls constituting the body, and the reduced pressure absorption panel is formed so as to substantially cover the entire surface of each side wall.

Reinforcing dents are formed on each side wall of the container body, respectively, on the front and back surfaces with a wide width, in an isosceles triangle symmetrical with respect to the center of the side wall, and with a rectangular shape on the side surface with a narrow width. A vacuum absorbing panel is provided at each lower portion so as to cover the central portion of the 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 while maintaining the necessary strength . Therefore, the decompression absorption panel is continuously provided on almost the entire surface of each side wall so that the sidewall is formed in a flat plate shape, and the decompression absorption panel is provided only on one side of the constriction, or is divided vertically by the constriction. This prevents a reduction in the area of the vacuum absorbing panel.

  The cross-sectional aspect ratio of the trunk is determined on the basis of the distance between the opposing side walls, and does not take into account slight swelling of the trunk or chamfered portions at the corners of the trunk. When the cross-sectional aspect ratio of the container is 1: 1.15 or less, the difference between the front surface of the trunk portion (referring to one surface of the side wall whose width is wider than the other side wall) and the side surface becomes unclear, and the conveyance path When the containers are arranged in the same manner, it is conceivable that a front-facing container and a side-facing container are mixed. On the other hand, when the cross-sectional aspect ratio is 1: 1.30 or more, the length of the trunk circumference increases rapidly when a container of the same capacity and height is formed, and the container is crossed at the same capacity and height. Much more resin material for molding is required than a container whose surface is nearly square.

2. It has heat resistance capable of injecting a high-temperature content liquid, and has a square resin container with an overall height of 200 mm to 220 mm .

  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 overall height of 200 mm to 220 mm is based on the height of a widely distributed 500 ml PET resin container formed in the range of 200 mm to 220 mm. That is, it is a height that can be stored in a display shelf for displaying a 500 ml resin container without changing the height width of the display shelf. Within this range, the height is preferably approximately 207 mm.

3. A rectangular resin container was constructed with a container capacity of 1 liter .
4. In addition to the above configuration, the front and back side wall upper portions are formed in a mountain shape, and a dent for reinforcement is formed on the flat portion formed in the mountain shape above the two upper edges of the side wall and the vacuum absorbing panel. Along the edge, the base was formed as horizontal.

  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 aspect ratio of the trunk cross section is 1: 1.15 or more, the difference between the front and side widths becomes clear. Thereby, mixing of a front-facing container and a side-facing container can be prevented, and a large number of rectangular resin containers can be arranged in the same direction and transported by a transport line or the like.

  Since the aspect ratio of the trunk cross section is 1: 1.30 or less, the flatness of the trunk cross section becomes low. Thereby, compared with a container having a square cross section having the same height and capacity, the increase in the circumference of the body portion is not so large, and the increase in the resin weight required for molding can be reduced. Since it is a rectangle with an appropriate flatness, it is easy to hold and handle.

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

  Since the overall height is in the range of 200 mm to 220 mm, the rectangular resin containers can be displayed as they are on the storage shelves for displaying the containers containing 500 ml that are widely distributed.

  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. Moreover, the mouth part 4 is subjected to whitening treatment and has heat resistance due to this.

  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 almost 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. .

  A decompression absorption panel 14 and a recess 16 are provided on the front and rear side walls 9 (both of which have the same shape as in FIG. 1) of the rectangular resin container 2.

  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 almost the entire side wall 9.

  The dent 16 is formed in the upper part of the side wall 9 of the front surface and the back surface of the square resin container 2. The front and back side walls 9 have a chevron shape at the top, and the recess 16 is formed in a flat portion formed in the chevron shape along the two upper edges of the side wall 9 and the upper edge of the vacuum absorbing panel 14. Is an isosceles triangle symmetrical with respect to the center of the side wall 9. As shown in FIG. 5, the recess 16 has a flat inside and is formed at substantially the same depth as the vacuum absorbing panel 14. The dents 16 formed on the front surface and the back surface of the square resin container 2 are formed at the same position facing each other across the center of the square 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 decompression absorption panel 14 is formed on each of the side walls 9 of the trunk portion 8 so as to cover almost the entire side wall 9, the rectangular resin container 2 has a high decompression 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 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.

  Further, since the aspect ratio is about 1: 1.25, the circumference of the body portion 8 does not become excessively long. Therefore, the resin material for molding can be reduced, and the rectangular resin container 2 can be reduced in weight.

  Since the overall height is about 207 mm, the rectangular resin container 2 can be easily displayed without changing the currently used display shelf.

  FIG. 6 shows the relationship between the flatness of the rectangular resin container and the trunk circumference. This graph shows the circumference of the trunk when the flatness of the trunk is changed with the same capacity and overall height. When the aspect ratio of the trunk cross section exceeds 1: 1.30, the circumference suddenly increases. It can be seen that the length becomes longer.

In the above embodiment, the aspect ratio of the cross section is 1: 1.25, but the present invention is not limited to this.

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 dent and a reduced pressure absorption panel. It is a graph showing the relationship between the aspect ratio of the trunk and the circumference.

Explanation of symbols

2 square resin container 4 mouth 6 shoulder 8 trunk 9 side wall 10 bottom 11 connecting wall 12 broken line 13 flat plate 14 decompression absorption panel 16 dent 19 rib

Claims (2)

It is a resin container with a square cross section, and it has heat resistance that can inject content liquid in a high temperature state,
Using PET resin as a raw material, molded by biaxial stretch blow molding,
The storage capacity of the container is 1 liter, and the total height is 200 to 220 mm, which is almost the same as a resin container having an internal volume of 500 ml.
And the cross-sectional aspect ratio of the trunk is set to a value of 1: 1.15 to 1: 1.30,
Reinforcing dents are formed on each side wall of the container body, respectively, in an isosceles triangle that is symmetrical with respect to the center of the side wall on the front and back surfaces having a wide width, and in a rectangle on the side surface having a narrow width,
A rectangular resin container characterized in that a reduced pressure absorption panel is provided at the lower part of the dent so as to substantially cover the entire surface of all the side walls forming the four side surfaces of the body part . The upper part of the side wall on the front and back sides is formed in a chevron shape, and a dent for reinforcement is formed in the flat part formed in the chevron, with the bottom side being horizontal along the two upper edges of the side wall and the upper edge of the vacuum absorbing panel. The rectangular resin container according to claim 1 formed.

Images