JPH08244747A - Plastic bottle - Google Patents

Abstract

PURPOSE: To obtain a plastic bottle which can be folded to a compact state without marring the appearance by forming a wall of flexible material for each of the left and right side walls and one of rigid material for each of the front and back walls. CONSTITUTION: By applying a method for parison molding for varying lengthwise colors a parison is extruded in such a way as to alternate approximately for each peripheral one-quarter region a part formed of a flexible synthetic resin with a part formed of a rigid synthetic resin. A plastic bottle 1 is formed by blow molding in a mold in a manner of forming the left and right side walls 4, bottom walls 5a, and shoulder walls 6a, the last two items being continuations of the respective side walls, of a material of flexible synthetic resin and the front and back side walls 2, bottom walls 5b, and shoulder walls 6b, the last two items being continuations of the respective front and back side walls, of a material of rigid synthetic resin. After being emptied, the plastic bottle 1 can be transported in a compactly folded state by longitudinally folding inward the middle of each of the left and right side walls 4 and their continuations being the bottom walls 5a and shoulder walls 6a so that the transportation can be carried out efficiently.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin bottle suitable as a container for foods, cosmetics, agricultural chemicals and the like.

[0002]

2. Description of the Related Art In recent years, as a container for foods, especially drinking water, a resin bottle made of a synthetic resin material manufactured by blow molding is lightweight and excellent in watertightness, advantageous in strength, It has been widely used in place of glass bottles because of its excellent properties such that it can be seen through and can be molded into various shapes.

Usually, soft drinks and the like are shipped by first transporting a resin bottle manufactured by a bottle manufacturer to a beverage manufacturer by a transportation means such as a truck, filling the contents with the beverage manufacturer, etc. . In addition, the user disposes the used resin bottle as it is, or recently, from the viewpoint of effectively using resources, bring it to a predetermined collection place for reuse and hand it over to a collection company. .

[0004]

By the way, since a resin bottle cannot be folded or assembled basically like a paper pack, and it cannot be easily cut into small pieces. It has the following problems. That is, even an empty bottle occupies the same space as the bottle containing the content, so the transportation cost is high. In addition, since it is bulky, it is inconvenient to carry an empty bottle after use, and the amount of garbage is increased, which imposes an unnecessary burden on the user. In addition, even when it is collected for reuse, it is bulky and inconvenient to carry, and it requires a large storage space for the collected empty bottles or a small crusher to reduce the storage space. Need to be installed, which is one of the causes of lowering the recovery rate.

An object of the present invention is to provide a resin bottle which can be folded compactly without spoiling its appearance.

[0006]

A resin bottle according to a first aspect is a resin bottle integrally molded of a synthetic resin material, the wall portion of which has a uniform shape with a flexible soft wall portion. It is constituted by a hard wall portion which is shaped, and at least the front wall portion is constituted by a hard wall portion.

Here, as described in claim 2, the hard wall portion and the soft wall portion are made of different synthetic resin materials and integrally molded by different color molding. As described in claim 3, the hard wall portion is formed. Is preferably thicker than the soft wall portion.

A resin bottle according to a fourth aspect is a resin bottle integrally molded of a synthetic resin material, and a side wall portion thereof is provided with a bulging portion in which a part or the whole of the side wall portion is bulged sideways, The bending guide portion is formed along the outer edge of the bulging portion to guide the reversal of the bulging portion toward the center of the bulging portion.

Here, as described in claim 5, the outer edge of the bulged portion is formed into an even number of polygons, and a central fold that surrounds a region similar to the outer edge of the bulged portion in the central portion of the bulged portion. It is a preferred embodiment that the guide portion is formed, and the auxiliary folding guide portion is formed over the corner portion of the folding guide portion and the corner portion of the central folding guide portion along the outer edge of the bulge portion. .

[0010]

In the resin bottle according to the first aspect, the wall portion of the resin bottle is composed of a flexible soft wall portion and a hard wall portion which is held in a fixed shape. It can be used by folding it to fold it compactly or by expanding the soft wall to develop it into the desired shape. For example, when transporting or carrying a resin bottle, the soft wall portion is bent to be compactly folded, and while filling and using the contents, the resin bottle is developed and used in a desired shape. On the other hand, since the front wall is composed of a hard wall,
Since the front wall portion on which the product name or the like is printed is always held in the desired shape and is not bent or deformed, the appearance of the resin bottle does not deteriorate.

Here, when the hard wall and the soft wall are made of different synthetic resin materials and the resin bottle is integrally molded by different-color molding, the structure of the molding machine itself becomes a little complicated, but even the soft wall is formed. A sufficient film thickness will be secured.
Further, if the hard wall portion of the resin bottle is made thicker than the soft wall portion, flexibility is imparted to the soft wall portion without using two kinds of synthetic resin materials, and On the other hand, shape retention is given.

In the resin bottle according to claim 4, a bulging portion is provided in which a part or the whole of the side wall portion of the resin bottle is bulged laterally, and the bending guide portion is provided along the outer edge of the bulging portion. The resin bottle is compactly folded by pressing the bulging portion along the bending guide portion to invert it to the inside. Also, by supplying pressurized air etc. to the folded resin bottle, the internal pressure of the resin bottle is increased,
The bulging portion is turned over to the outside and the resin bottle is developed. On the other hand, since the resin bottle can be made rigid in the portion other than the bending guide portion, when the product name or the like is printed on the wall surface other than the bending guide portion, the printed portion is not bent or deformed.

Here, the outer edge of the bulging portion is formed into an even number of polygons, a central bending guide portion is formed in the central portion of the bulging portion, and the bending guide portion along the outer edge of the bulging portion is formed. When the auxiliary bending guide portion is formed over the corner portion and the corner portion of the central bending guide portion, the operation force for reversing the bulge portion effectively acts on the three bending guide portions. By bending these three sets of bending guide portions, the bulging portion can be smoothly inverted.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] As shown in FIGS. 3 and 4, a resin bottle 1
Is the front and rear wall portions 2 and 3, and the left and right side wall portions 4
The bottom wall 5, the pyramidal shoulder 6 that shrinks upward, and the mouth 7 that extends upward from the upper end of the shoulder 6 are integrally formed into a substantially rectangular columnar shape. Then, by screwing a cap member (not shown) into the mouth portion 7, the resin bottle 1
Is configured to be liquid-tightly sealed.

This resin bottle 1 is made of a soft synthetic resin material and a hard portion for each approximately 1/4 area in the circumferential direction by a parison longitudinal direction different color molding method (for example, multi-blow molding method). The parison is extruded so that the portions made of a synthetic resin material are alternately arranged, and the left and right side wall portions 4 and the bottom wall portion 5 and the wall portions 5a and 6a of the shoulder portion 6 which are continuous with the side wall portion 4 are made of a soft synthetic resin material. Front side and rear side walls 2, 3
And the bottom wall portion 5 and the wall portions 5b and 6b of the shoulder portion 6 which are continuous with the bottom wall portion 5 and the shoulder portion 6 are formed by blow molding in a mold.

That is, the left and right side walls 4, the bottom wall 5 and the walls 5a, 6a of the shoulder 6 which are continuous with the left and right side walls 4 are composed of flexible soft walls, and the front and back side walls are formed. 2,
3 and the walls 5b and 6b of the bottom wall 5 and the shoulder 6 which are continuous with 3
Is composed of a hard wall portion that is held in a constant shape.

Next, the operation and effect of the resin bottle 1 will be described. When the empty resin bottle 1 is transported, as shown in FIGS. 1 and 2, the left and right side wall portions 4 and the bottom wall portion 5 and the wall portions 5a and 6a of the shoulder portion 6 connected to the left and right side wall portions 4 are substantially centered in the width direction. The resin bottle 1 is compactly folded and transported by bending the portion around the center. Therefore, the resin bottle 1 manufactured by the bottle manufacturer can be folded compactly and transported by a truck or the like, and the transportation efficiency can be improved and the transportation cost can be reduced.

In a beverage maker or the like, by supplying pressurized air to the folded resin bottle 1 or by injecting drinking water or the like as it is under pressure, the resin bottle 1 is The bottle 1 is unfolded and the contents are filled.
However, the resin bottle 1 can also be used as a bottle for enclosing a fluid such as powder or granules of food or cosmetics in addition to a liquid such as drinking water.

The resin bottle 1 containing the contents thus manufactured is displayed or used in a store or a general household in a state where it is developed into a desired shape. Since the walls 2 and 3 are hard walls, the front wall 2 on which the product name and the like are printed and the back wall 3 on which usage instructions and notes are printed are always in the desired shapes. Since the resin bottle 1 is held and is not bent or deformed, the appearance of the resin bottle 1 is not deteriorated, and the weight and luxury feeling peculiar to the resin bottle are not deteriorated.

After the contents are used, by folding the resin bottle 1 compactly as in the case of transportation, the volume of dust can be reduced and it is convenient to carry, so that the burden on the user can be reduced. Further, even when the resin bottle 1 is collected for reuse, the resin bottle 1 can be folded compactly, so that the space occupied by the collected resin bottle 1 can be reduced without providing a dedicated crusher or the like.

In the first embodiment, the present invention is applied to the resin bottle 1 having a quadrangular prism shape. However, a resin bottle having a polygonal prism shape other than the quadrangular prism shape can also be used in a circular cross section, an elliptical shape, or an oval shape. The present invention can be similarly applied to the cylindrical resin bottle 1. Further, the hard wall portion and the soft wall portion are arranged alternately, but the arrangement of both is appropriately set.

Further, in the first embodiment, by changing the synthetic resin material, the flexible soft wall portion and the hard wall portion held in a constant shape are formed. However, the thickness of the soft wall portion is large. By setting the thickness to be smaller than the wall thickness of the hard wall portion, it is possible to impart flexibility to the soft wall portion and shape retention to the hard wall portion.

[Second Embodiment] As shown in FIGS. 7 and 8,
The resin bottle 11 is a hollow synthetic resin material bottle having a substantially hexagonal shape in a front view, and has wall portions 12 and 13 on the front side and the back side.
Is bulged outwardly in a trapezoidal cross section, and the wall 1
A bulge portion is formed by 2 and 13. In this resin bottle 11, the wall portions 12 and 13 on the front side and the back side are inverted inward as shown in FIGS. 5 and 6, so that the resin bottle 11 can be folded compactly. However, since the front and rear wall portions 12 and 13 have the same structure, the front wall portion 12 will be described.

At the outer edge of the front wall portion 12, as shown in FIGS. 7 to 9, there is formed a bending guide portion 15 recessed inward. At the center of the front wall portion 12, a central bending guide portion 16 that is recessed inward is formed so as to surround a hexagonal area similar to the outer edge. An auxiliary folding guide portion 17 is formed which is recessed inward over the corner portion of the folding guide portion 15 and the corner portion of the central folding guide portion 16. The bending guide 1
5 to 17 are formed by blow-molding the resin bottle 11 in a mold having protrusions corresponding to the bending guides 15 to 17. The folding guide portion 15, the center folding guide portion 16, and the auxiliary folding guide portion 17 are provided in the wall portions 12 and 13.
It is desirable to set the wall thickness thinner.

Since the shape of the resin bottle 11 can be changed between the unfolded state as shown in FIGS. 7 and 8 and the folded state as shown in FIGS. Similarly, the transportation cost can be reduced, the appearance of the resin bottle 11 can be prevented from being deteriorated, and the weight and luxury feeling peculiar to the resin bottle can be prevented, and the resin bottle 11 recovered for reuse can be used. The required space can be reduced, and other effects can be obtained. In addition, it is possible to easily manufacture using an existing blow molding machine by making a slight change to the mold.

Next, a modification in which the structure of the resin bottle 11 is partially changed will be described. (1) The present invention can be similarly applied to a resin bottle having a polygonal shape other than the hexagonal shape in a front view. However, in this case, it is preferable that the front and rear wall portions 12 and 13 are bilaterally and vertically symmetrical and formed in an even polygonal shape. (2) Like the resin bottle 11A shown in FIGS. 10 and 11, the resin bottle 11A is formed in a rectangular parallelepiped shape, and the bulging portion 21 in which only part of the left and right side wall portions 20 is bulged laterally is provided. The bulging portion 21 may be inverted along the bending guide portions 15 to 17. However, even in this case, the shape of the resin bottle 11A, the formation position of the bulging portion 21, and the like can be appropriately set.

(3) Resin bottle 1 shown in FIGS. 12 and 13
Like 1B, the resin bottle 11B is formed in a rectangular parallelepiped shape,
You may comprise so that the shoulder part 25 and the mouth part 26 may be inverted to the center part side of the resin bottle 11B along the bending guide parts 15-17. In this case, since the resin bottle 11B has a rectangular parallelepiped shape in the folded state, the empty resin bottle 11B
It is possible to stack and transport and store. However, the resin bottle 11B may have a polygonal cross section other than a quadrangular shape, and may have a circular shape, an elliptical shape, or an oval shape as long as it has a columnar shape. (4) The wall thickness of the bending guide portions 15 to 17 may be set to be thinner than the wall portions of the resin bottles 11, 11A, 11B to promote the reversal movement of the bulging portion. When the bulge amount of the bulge portion is relatively small, the folding guide portions 16, 1
It is also possible to omit 7.

[0028]

According to the resin bottle of the first aspect, since the resin bottle can be folded compactly, it is possible to reduce the transportation cost when the unused empty bottle is transported. Also,
Empty bottles after use can also be folded compactly and discarded or carried around, reducing the burden on the user. Furthermore, when collecting for reuse, the storage space for empty bottles is small, and a sufficient number of empty bottles can be stored without providing a crusher or the like at the collection place, so the burden on the collection company is reduced. . Furthermore,
Since the front wall portion of the resin bottle is composed of a hard wall portion, the front wall portion on which the product name or the like is printed is always held in the desired shape, and is not bent or deformed.
It is also possible to prevent the appearance of the resin bottle from being deteriorated, and the weight and luxury feeling peculiar to the resin bottle from being deteriorated.

Here, when the hard wall portion and the soft wall portion are made of different synthetic resin materials and the resin bottle is integrally molded by different color molding, a sufficient film thickness of the soft wall portion is ensured and the strength of the resin bottle is improved. It is possible to set the manufacturing cost of the resin bottle to be almost the same as the conventional one while ensuring sufficient rigidity. Further, when the hard wall portion is made thicker than the soft wall portion and a resin bottle having a hard wall portion and a soft wall portion is manufactured from one kind of synthetic resin material, it is possible to use a special molding device without using a special molding device. A resin bottle can be manufactured, and the present invention can be realized at the same cost as before.

In the resin bottle according to claim 4, since the swelling portion is turned inward along the bending guide portion and the resin bottle can be folded compactly, the same effect as that of the resin bottle according to claim 1 is obtained. Is obtained. Further, since the portion other than the bending guide portion can be configured by the hard wall portion, it is possible to prevent the appearance of the resin bottle from being deteriorated and the weight and luxury feeling peculiar to the resin bottle from being deteriorated.

Here, if the outer edge of the bulging portion is formed into an even number of polygons and a central bending guide portion and an auxiliary bending guide portion are provided, the operating force for reversing the bulging portion is set to three sets. It is possible to efficiently act on the curved guide portion and smoothly invert the bulging portion. Also, for parts other than the bending guide,
Since an unreasonable inversion operation force does not act, damage to the resin bottle during inversion can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a resin bottle according to a first embodiment in a folded state.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of the expanded state of the resin bottle according to the first embodiment.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a view corresponding to FIG. 1 of a resin bottle according to a second embodiment.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a diagram corresponding to FIG. 3 of the resin bottle according to the second embodiment.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a vertical cross-sectional view of a main part of a resin bottle according to a second embodiment.

FIG. 10 is a perspective view of a resin bottle having another configuration.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is a perspective view of a resin bottle having another configuration.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

 1 Resin Bottle 2 Front Wall Part 3 Back Wall Part 4 Side Wall Part 5 Bottom Wall Part 6 Shoulder Part 7 Mouth Part 5a Wall Part 5b Wall Part 6a Wall Part 6b Wall Part 11 Resin Bottle 12 Front Wall Part 13 Back Wall Part 15 Bend Guide part 16 Central bending guide part 17 Auxiliary bending guide part 11A Resin bottle 20 Side wall part 21 Bulging part 11B Resin bottle 25 Shoulder part 26 Mouth part

Claims (5)

[Claims] 1. A resin bottle integrally molded of a synthetic resin material, the wall portion of which is a flexible soft wall portion,
A resin bottle comprising a hard wall part having a fixed shape and at least a front wall part having the hard wall part. 2. The resin bottle according to claim 1, wherein the hard wall portion and the soft wall portion are made of different synthetic resin materials and integrally molded by different color molding. 3. The resin bottle according to claim 1, wherein the hard wall portion is thicker than the soft wall portion. 4. A resin bottle integrally molded of a synthetic resin material, wherein a bulging part is formed by bulging a part or all of a side wall of the resin bottle laterally, and the resin bottle bulges toward the center side. A resin bottle in which a bending guide portion for guiding the reversal of the portion is formed along the outer edge of the bulging portion. 5. The outer edge of the bulge portion is formed into an even polygon.
A central bending guide part is formed in the central part of the bulging part to surround a region similar to the outer edge of the bulging part, and the corner part of the bending guide part along the outer edge of the bulging part and the central bending guide part The resin bottle according to claim 4, wherein an auxiliary bending guide portion is formed over the corner portion.