JP4769976B2 - Cylindrical container and manufacturing method thereof - Google Patents

Description

  The present invention relates to a cylindrical container and a method for manufacturing the same. More specifically, the present invention relates to a cylindrical container that can be easily and reliably reduced in volume at the time of disposal and a method for manufacturing the same.

  Conventionally, synthetic resin containers such as plastic bottles and metal containers such as aluminum cans have been used as containers for beverages such as tea, sports drinks, coffee, and beer.

  Since these containers have a predetermined rigidity from the viewpoint of maintaining the shape during transportation, it is not easy to crush these containers manually. For this reason, the disposal of these in a collection box or the like is generally performed as it is. That is, it is discarded into a collection box or the like without reducing the volume of the container. As a result, the collection efficiency of the collection box is reduced. In addition, since the collection efficiency of the collection box is poor, containers such as PET bottles are scattered around the collection box, not only deteriorating the beauty but also deteriorating the environment.

  In order to solve such a problem, Patent Document 1 proposes a beverage can devised so that the beverage can after beverage can be crushed by human power.

However, the beverage can according to the proposal has a problem that the operation of crushing the beverage can is complicated because the volume is reduced by compressing the beverage can after being twisted. Further, in the beverage can according to the proposal, since the groove is formed up to the bottom of the can, there is also a problem that there is a risk of injury when twisting.
JP-A-6-293340

  The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a cylindrical container and a method for manufacturing the same that can surely reduce a desired volume by simply grasping and twisting both ends. It is said.

  As a result of earnest researches on the problems of the prior art, the present inventors have obtained the following knowledge and completed the present invention.

  In general, when twist is applied to a cylindrical container, buckling occurs. At that time, as shown in FIG. 1, a unique buckling pattern appears in the cylindrical container. Therefore, by deriving from the buckling pattern a pattern that quickly changes to the buckling pattern when torsion is applied, and applying the derived pattern to the container body in advance, the buckling of the cylindrical container is reduced. The present invention was completed by obtaining knowledge that the cylindrical container can be crushed in the axial direction easily and reliably by human power (see FIG. 2).

  The pattern can be easily derived by, for example, mounting a cylindrical container on a thin-walled cylindrical torsion tester, winding a roll paper around the cylindrical container, and twisting it.

That is, the cylindrical container of the present invention is a cylindrical container used for a beverage container, and the body is a buckling pattern preliminary body that changes to a buckling pattern when the cylindrical container is twisted. At least one step, and the buckling pattern preform includes a valley line, a ridge line, and a convex surface and a concave surface formed between one and the other of the valley line and the ridge line, or the entire circumference of the cylindrical container or It is characterized by having a part .

  Moreover, in the cylindrical container of this invention, it is preferable that the depth of some trough lines is deeper than the depth of other trough lines.

A cylindrical container manufacturing method according to the present invention is a cylindrical container manufacturing method used for a beverage container, wherein a buckling pattern preliminary body that changes to a buckling pattern when twisted is applied to the cylindrical container. A step of manufacturing a cylindrical container having a pre-buckling pattern body in a body using a formed body adapted to form , wherein the pre-buckling pattern body includes a valley line, a ridge line, a valley line, and It has a convex surface and a concave surface formed between one and the other of the ridge lines, respectively, on the entire circumference or a part of the cylindrical container .

  In the method for manufacturing a cylindrical container according to the present invention, for example, a cylindrical container made of synthetic resin is manufactured by an injection blow molding method or a rotational molding method, or a press molding including a procedure for forming a pre-buckling pattern body. Thus, a metal cylindrical container is manufactured.

A molded body such as a mold according to the present invention is a molded body configured to form a buckling pattern preliminary body on a cylindrical container body, and the buckling pattern preliminary body includes a valley line and a ridge line. And a convex surface and a concave surface formed between one and the other of the valley line and the peak line, respectively, on the entire circumference or a part of the cylindrical container .

  In the molded body such as the mold of the present invention, it is preferable that the depth of some valley lines is deeper than the depth of other valley lines.

  Since the present invention is configured as described above, the cylindrical container can be easily and reliably crushed in the axial direction by human power. Therefore, the excellent effect that the collection | recovery efficiency in the collection | recovery box of a cylindrical container can be aimed at is acquired.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

Embodiment 1
The principal part of the cylindrical container 1 concerning Embodiment 1 of this invention is shown in FIG. In the first embodiment, the cylindrical container 1 is a 500 ml PET bottle having an average diameter of 60 mm. Further, the shape of the cylindrical container 1 is not limited to a pure cylindrical shape as shown in FIG. 4A, and may be a drum shape as shown in FIG. It may be a stepped cylindrical shape with steps provided on the top and bottom as shown in 4 (c).

  In the cylindrical container, that is, the barrel of the PET bottle 1, a pattern 2 (hereinafter referred to as a pre-buckling pattern body) 2 that quickly changes to a buckling pattern generated during buckling is formed at a predetermined interval.

As shown in the partial development view of FIG. 5 and the partial enlarged end view of FIG. 6, the buckling pattern preliminary body 2 is formed in parallel with a predetermined angle inclined with respect to the axis C (see FIG. 3). A predetermined number of valley fold lines (hereinafter referred to as valley lines) 3, a ridge fold line formed so as to span the upper and lower ends of adjacent valley lines 3, 3, and 4 (hereinafter referred to as peak lines); , Including a convex surface 5 formed between one of the wires 3 and 4 (front of the ridgeline 4 in the twisting direction) and a concave surface 6 formed between the other (backward of the ridgeline 4 in the twisting direction). It is said. Here, the angle alpha _T between a ground line _{L B} and valley 3 in the developed view becomes 57 degrees to 60 degrees, the angle beta _T between a ground line _{L B} and Minesen 4 and 70 to 65 degrees Become. Therefore, the height h of the buckling pattern preliminary body 2 is about 70 mm to 80 mm.

  The maximum protrusion amount a of the convex surface 5 is about 3 mm, and the maximum depression amount b of the concave surface 6 is about 3 mm.

  In the illustrated example, the pre-buckling pattern body 2 is formed over the entire circumference, but it is not necessarily formed over the entire circumference, and may be formed partially. In addition, the depths of the valley lines 3 do not have to be all the same, and the depth of some valley lines 3 may be deeper than the depth of other valley lines 3. For example, the depth may be increased every third to three.

  Since the length of the barrel of the 500 ml PET bottle 1 is about 150 mm, the volume of about 50% can be reduced by the one-stage buckling pattern preliminary body 2. Therefore, by forming the buckling pattern preliminary body 2 in one stage on the body of the plastic bottle 1, the volume can be reduced by about 50%.

  Thus, the PET bottle 1 having such a configuration is formed by using, for example, an injection blow molding method or a rotational molding using a molded body such as a mold in which a pattern for forming the buckling pattern preliminary body 2 is formed on the inner surface. It can be easily manufactured by the method.

  As described above, in the first embodiment, since the body 2 of the plastic bottle 1 is provided with the buckling pattern preliminary body 2, the plastic bottle 1 can be axially moved by simply gripping and twisting both ends of the plastic bottle 1. To reduce its volume. In addition, the buckling pattern preliminary body 2 is configured to quickly change into a buckling pattern that is generated when the plastic bottle 1 is buckled by twisting, so that the plastic bottle 1 can be buckled reliably and quickly. That is, it can be crushed in the axial direction.

  In addition, since the shape of the PET bottle 1 is maintained by the internal pressure of the contents before opening, there is no possibility of causing adverse effects such as shape abnormality due to the provision of the buckling pattern preliminary body 2 on the body. .

Embodiment 2
A cylindrical container 1A according to Embodiment 2 of the present invention is shown in FIG. In the second embodiment, the cylindrical container 1A is a 350 ml aluminum beer can having a diameter of 60 mm.

  As shown in FIG. 7, the cylindrical container, that is, the body of the beer can 1A, is formed with a pattern 2A (hereinafter referred to as a pre-buckling pattern body) 2A that quickly changes to a buckling pattern generated during buckling. Has been.

As shown in the partial development view of FIG. 5 and the partial enlarged end view of FIG. 6, the buckling pattern preliminary body 2 </ b> A is tilted with respect to the axis C (see FIG. 3) at a predetermined angle and formed in parallel. A predetermined number of valley fold lines (hereinafter referred to as valley lines) 3, a ridge fold line formed so as to span the upper and lower ends of adjacent valley lines 3, 3, and 4 (hereinafter referred to as peak lines); , Including a convex surface 5 formed between one of the wires 3 and 4 (front of the ridgeline 4 in the twisting direction) and a concave surface 6 formed between the other (backward of the ridgeline 4 in the twisting direction). It is said. Here, the angle beta _T between a ground line _L angle alpha _T between _B and valley 3 becomes 41 degrees to 43 degrees, baseline _{L B} and Minesen 4 in exploded view is the 55 ° to 57 ° Become. Therefore, the height h of the buckling pattern preliminary body 2 is about 45 mm.

  Further, the maximum protrusion amount a of the convex surface 5 is about 2 mm, and the maximum depression amount b of the concave surface 6 is about 2 mm.

  Since the length of the barrel of the 350 ml beer can 1A is about 110 mm, the volume of about 40% can be reduced by the one-stage buckling pattern preliminary body 2A. Therefore, the volume of about 80% can be reduced by forming the buckling pattern preliminary body 2A in two stages on the body of the beer can 1A.

  Therefore, the beer can 1A having such a configuration uses, for example, a molded body such as a mold in which a pattern for forming the buckling pattern preliminary body 2A is formed on an aluminum molded product that has been ironed. It can be easily manufactured by applying a bulge forming process.

  Thus, in this Embodiment 2, since the 1st or 2nd step buckling pattern preliminary body 2A is provided on the body of the beer can 1A, it is only necessary to grip and twist both ends of the beer can 1A. The beer can 1A can be crushed in the axial direction to reduce its volume. Further, the buckling pattern preliminary body 2A is configured so as to quickly change into a buckling pattern generated when the beer can 1A is buckled by twisting, so that the beer can 1A can be buckled reliably and quickly. That is, it can be crushed in the axial direction.

  In addition, since the shape of the beer can 1A is maintained by the internal pressure of the contents before opening, there is no possibility that the beer can 1A may be adversely affected by the abnormal shape due to the provision of the buckling pattern preliminary body 2A on the body.

  As mentioned above, although this invention has been demonstrated based on embodiment, this invention is not limited only to this embodiment, A various change is possible. For example, in the embodiment, a plastic bottle and an aluminum can are described as examples of the cylindrical container, but a cylindrical container made of various materials can be used, for example, a steel can.

  The present invention is applicable to beverage containers such as plastic bottles and beer cans.

It is an image figure which shows the principle of this invention. It is an image figure which shows the state which a cylindrical container is crushed by this invention. It is a principal part schematic of the cylindrical container which concerns on Embodiment 1 of this invention. It is the schematic of the cylindrical container which Embodiment 1 of this invention can apply, Comprising: (a) shows a pure cylindrical container, (b) shows a drum-shaped container, (c) shows a step. The attached cylindrical container is shown. It is a partial expanded view of the buckling pattern prior body which concerns on Embodiment 1 of this invention. FIG. It is the schematic of the cylindrical container which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical container, PET bottle 1A Cylindrical container, beer can 2 Buckling pattern prior body 3 Valley line 4 Peak line 5 Convex surface 6 Concave surface

Claims (7)

A cylindrical container used for a beverage container, comprising a buckling pattern preliminary body that changes to a buckling pattern when a twist is applied to the cylindrical container;
The buckling pattern prior body has a valley line, a ridge line, and a convex surface and a concave surface formed between one and the other of the valley line and the ridge line, on the entire circumference or a part of the cylindrical container. cylindrical container, characterized in that are. Cylindrical container according to claim 1, wherein the depth of the part of the valley line is characterized by comprising a deeper than the depth of the other valley line. A method for producing a cylindrical container used for a beverage container,
A cylindrical container having a buckling pattern preliminary body in a body portion is manufactured using a molded body configured to form a buckling pattern preliminary body that changes to a buckling pattern when twisting is applied to the cylindrical container. Including procedures,
The buckling pattern prior body has a valley line, a ridge line, and a convex surface and a concave surface formed between one and the other of the valley line and the ridge line, on the entire circumference or a part of the cylindrical container. A method for producing a cylindrical container, wherein: 4. The method for manufacturing a cylindrical container according to claim 3, wherein a cylindrical container made of synthetic resin is manufactured by an injection blow molding method or a rotational molding method. 4. The method for manufacturing a cylindrical container according to claim 3 , wherein the cylindrical container made of metal is manufactured by press molding including a procedure for forming a pre-buckling pattern body on the body portion. A molded body configured to form a pre-buckling pattern body on a cylindrical container body ,
The prior buckling pattern body has a valley line, a ridge line, and a convex surface and a concave surface formed between one and the other of the valley line and the ridge line, respectively, on the entire circumference or a part of the cylindrical container. molded body characterized by comprising Te. The molded product according to claim 6, wherein the depth of some valley lines is deeper than the depth of other valley lines.