JPH11342948A - Plastic bottle - Google Patents

Abstract

(57) [Problem] To enable a plastic bottle having a bottom part 2, a side wall part 3, and a mouth part 1 having a smaller diameter than the side wall part 3 in a reusable form and sufficiently reduce the volume. I do. SOLUTION: A plurality of parallelograms are laid up and down and left and right in a state where each side is continuous to form an expanded figure of the side wall portion 3, and each of the parallelograms is placed at a position corresponding to each side of each laid out parallelogram. A mountain fold forming portion 4 that is foldable so as to protrude outward, and a valley that is foldable so as to be recessed outward at a position corresponding to the longer diagonal line of each of the parallelograms. A fold forming portion 5 is formed on the side wall portion 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bottle having a bottom portion, a side wall portion, and a mouth portion having a smaller diameter than the side wall portion. About bottles.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned plastic bottle, a bottle made of polyethylene terephthalate (commonly called a PET bottle), which is strong and lightweight, is often used.

[0003]

In recent years, along with the tightening of regulations on waste disposal, the motive for waste recycling has been increasing. For this purpose, it is important to reduce the volume of waste. . By the way, in the above-mentioned conventional PET bottle, the same applies to other plastic containers. However, although various volume reducing devices have been devised, compression is required due to the back spring that appears as a characteristic of the material. With only the result, the effect of volume reduction is extremely weakened. For example, when the collected PET bottle is compressed, if it is pressurized, it is once crushed, but if the pressing force is removed, it is restored at a considerable rate and the internal space is recovered. For this reason, the transport volume is increased, which is an obstacle to recycling. In order to reuse as a raw material after the volume reduction, a collected bottle is crushed and pelletized. However, the PET bottle after the volume reduction in this way cannot be reused unless a regeneration process is performed. In addition, it is difficult to reuse the plastic bottle whose volume has been reduced as described above. In other words, the crushed plastic bottle is not deformed so as to return to its original shape.

[0004] Therefore, an object of the present invention is to provide a plastic bottle capable of sufficiently reducing the volume in a reusable form.

[0005]

Means for Solving the Problems [Characteristic structure of the present invention] The characteristic structure of the plastic bottle of the present invention according to claim 1 is that a plurality of parallelograms are laid up, down, left and right with each side being continuous. Forming a developed figure of the side wall portion, and forming a mountain fold forming portion that is foldable so as to protrude outward at a position corresponding to each side of each of the spread parallelograms, further comprising: The valley fold forming portion is formed on the side wall portion and is foldable so as to be recessed outward at a position corresponding to a longer diagonal line of the shape (first characteristic configuration). In other words, according to the example shown in FIG. 1, the side wall portion 3 is formed in the circumferential direction of the peripheral wall portion in a state where a plurality of parallelograms are connected to each side as shown in an expanded figure in FIG. 5. It is laid up, down, left and right over eight rows. Then, a mountain fold forming portion 4 which is foldable on the side wall portion 3 so as to protrude outward at a position corresponding to each side of each of the spread parallelograms (see, for example, FIG. 4A) And a valley fold forming portion 5 that is foldable so as to be recessed outward at a position corresponding to the longer diagonal line of each parallelogram (for example, see FIG. 4B).
Is formed.

According to a second aspect of the present invention, in the first aspect, all the parallelograms are formed into congruent figures (the second aspect).
On the point. In other words, referring to FIG. 5, the two pairs of parallel mountain fold forming portions 4 surrounding the parallelogram have the same length. In other words, the mountain fold forming portions 4 in the circumferential direction of the side wall portion 3 are formed at equal intervals, and the oblique mountain fold forming portions 4 are also formed at equal intervals.

According to a third aspect of the present invention, there is provided a plastic bottle according to the first or second aspect, wherein the smaller corner of the parallelogram is formed by extending the parallelogram in the circumferential direction of the side wall. The third characteristic configuration is that the angle is set to an angle approximating the complement of the apex angle of the regular polygon corresponding to the number of arrangements. In other words, referring to FIG. 5, the smaller corner (b) of the parallelogram surrounded by the mountain fold forming portion 4 is determined by the number of the parallelograms arranged in the circumferential direction of the side wall portion 3 (for example, The angle is set to an angle approximating the complement of the apex angle (a) of a regular polygon (for example, a regular octagon) corresponding to 8). That is, in the case of the above-described regular octagon, the angle of the apex angle is a = 135 °, and therefore, the angle of the smaller angle is about b = 55 °, and the angle of the other angle is the same as the angle of the other angle. It almost coincides with the angle of the apex angle.

According to a fourth aspect of the present invention, there is provided a plastic bottle according to the third aspect, wherein the lengths of the four sides of the parallelogram are equal (a fourth aspect). That is, according to FIG. 5, the parallelogram surrounded by the mountain fold forming part 4 is a rhombus.

According to a fifth aspect of the present invention, there is provided the plastic bottle according to the first aspect, wherein all the parallelograms are formed into rectangles which are congruent with each other, and the mountain fold forming portion is formed in a vertical direction of the rectangle. A vertical mountain fold forming portion passing through the side and a horizontal mountain fold forming portion passing through the side in the circumferential direction of the side wall portion, and the bottom portion of one side approximating the length of the side along the circumferential direction of the side wall portion of the rectangle. It is formed in a regular polygonal shape having a length, and an angle between the valley fold forming portion and the horizontal mountain fold forming portion is set to be approximately one-half of a vertex angle of the regular polygon ( Fifth characteristic configuration). That is,
Explaining according to the example shown in FIG. 6, all the parallelograms in the first characteristic configuration are formed into congruent rectangles, and the mountain fold forming part 4 passes through the vertical side of the rectangle. It is formed in a vertical mountain fold forming part 4A and a horizontal mountain fold forming part 4B passing through the side of the side wall part 3 in the circumferential direction. And
The bottom portion 2 is formed in a regular polygonal shape having a length of one side approximating the length of a side along the circumferential direction of the rectangular side wall portion 3,
The angle between the valley fold forming section 5 and the horizontal mountain fold forming section 4B is set so as to be approximately one half of the apex angle of the regular polygon. In the illustrated example, a much larger number of vertical mountain fold forming portions 4A are actually formed on the side wall portion 3. However, in order to clearly show the state of the valley fold forming portion 5, the vertical mountain fold forming portion 5 is described. The interval between the fold forming portions 4A is greatly enlarged, and the polygon having a large number of corners becomes close to a circle. Accordingly, the outer periphery of the bottom portion 2 and the horizontal mountain fold forming portion 4B are approximated to a circle. Was.

The plastic bottle of the present invention according to claim 6 is characterized in that the number of corners of the regular polygon in the above-mentioned fifth characteristic structure is 5 or more (sixth characteristic structure).

[Function and Effect of Characteristic Configuration] The above-mentioned claim 1
According to the first characteristic configuration of the plastic bottle according to the invention described in (1), both expansion and contraction states can be stably reproduced. That is, according to the example shown in FIG. 1, the spiral valley fold forming portion 5 is formed on the side wall portion 3, for example, as shown in FIG.
As shown in (b), it is formed with a cross section that is convex inward to make it easy to bend inward. If it is mountain-folded along the mountain fold forming part 4 formed with a cross section that is convex outwardly to make it easy to bend,
In the folded state, these mountain folds 6 and valley folds 7
Are formed between them (see FIG. 3B). Moreover, a mountain fold 6 sandwiching the valley fold forming portion 5
The planar triangles on both sides surrounded by are superimposed to form a polygonal annular band on both the inner and outer circumferences (see FIG. 2). One of the mountain fold forming portions 4 is the side wall portion 3
Is formed along the circumferential direction, so that the folded polygonal annular band can be folded. Therefore, since the side wall portion 3 can be folded up and down, the plastic bottle can be reduced in the vertical direction. Further, if the valley fold forming portion 5 and the mountain fold forming portion 4 are formed in a cross-sectional shape as shown in FIG. 4, each of them fulfills a rib effect, and the side wall portion 3 is formed of a relatively flexible material. Even if it does, not only the side wall portion 3 can maintain the cylindrical shape, but also the in-plane tensile strain is generated in the valley fold forming portion 5 in the folding process shown in FIG. Since the in-plane compressive strain is also generated in the fold forming portion 4, the state of this process becomes unstable, and in the folded state, the triangle on the plane is folded as described above. In the folded state, the in-plane distortion has been eliminated. Therefore, so-called unstable switching is performed, and both the expanded state and the contracted state of the plastic bottle are stabilized. In short, the most significant feature of the configuration of the present invention is that no in-plane distortion occurs in the side wall portion in both the state where the plastic bottle is stretched and the state where the plastic bottle is compressed and folded to reduce the volume. On the point. Therefore, even if the plastic bottle is folded for a long time, no in-plane distortion is generated in the side wall, so that even when the plastic bottle is extended, no distortion remains on the side wall, and the volume is reduced for a long time. Even after being stored, it can be used immediately in a clean state.

According to the second aspect of the plastic bottle according to the second aspect of the invention, in addition to the operation and effect of the first aspect, in addition to the outline close to the bottom, the lateral displacement is large in the vertical direction. It is possible to fold the plastic bottle in a state that does not occur. . That is, according to the example shown in FIG. 1, the mountain fold forming section 4 forming the outline of the parallelogram is mountain-folded, and the valley is formed along the valley fold forming section 5 along the diagonal line of the parallelogram. When folded, the outer circumference of a polygonal annular band formed by folding a triangle surrounded by a mountain fold 6 and a valley fold 7 formed by folding has the same angle between the mountain folds 6 of the triangle. Since the angle becomes an angle, the contour becomes a shape close to a regular polygon (see FIG. 3).

[0013] According to the third aspect of the plastic bottle according to the third aspect of the present invention, the folded shape of the plastic bottle is less likely to collapse during the operation and effect of the first or second aspect. . That is, according to the example illustrated in FIG. 1, a plane surrounded by a mountain fold 6 and a valley fold 7 formed by mountain-folding the mountain fold forming section 4 and valley-folding the valley fold forming section 5. Since the vertex angle of the triangular shape is the same angle as the vertex angle of the regular polygon, the outer contour of the polygonal annular band formed by folding is close to a regular polygon. Therefore, especially in the case of the second characteristic configuration, a plane surrounded by a valley fold 7 in which the valley fold forming section 5 is valley-folded and a mountain fold 6 in which the mountain fold forming section 4 is mountain-folded. The triangular shape becomes a shape close to an isosceles triangle, so that the triangular flat plates to be folded overlap one another up and down.

According to the fourth aspect of the plastic bottle according to the fourth aspect of the invention, the folded shape of the plastic bottle can be arranged while achieving the effects of the third aspect. In other words, according to the example shown in FIG. 1, a mountain fold 6 formed by mountain fold along a mountain fold formation portion 4 along each side of a parallelogram, and a valley fold obtained by valley fold of a valley fold formation portion 5 7 is an isosceles triangle, and the apex angle is the same as the apex angle of the regular polygon. Therefore, the outer contour of the polygonal annular band formed by folding is obtained. The shape becomes a regular polygon. Therefore, it is possible to fold the polygonal annular band formed in multiple layers with the corners aligned.

According to the fifth aspect of the plastic bottle according to the fifth aspect of the present invention, the plastic bottle can be folded into a polygonal shape having the same shape as the bottom. That is, according to the example shown in FIG. 6, the vertical mountain fold forming section 4A and the horizontal mountain fold forming section 4B along each side of the rectangle are mountain-folded, and the valley fold is formed along the valley fold forming section 5. In this case, the valley fold 7 passes through substantially the center of the bottom 2. At this time, the mountain fold 6 that is mountain-folded along the vertical mountain fold forming portion 4A substantially overlaps the side of the bottom 2. Therefore, put the plastic bottle on the bottom 2
It is possible to fold the same shape. In addition, since plastic has elasticity and flexibility, the angle between the valley fold forming part 5 and the horizontal mountain fold forming part 4B is a half of the apex angle of the regular polygon formed by the bottom part 2. It is possible to fold the plastic bottle even if there is a slight deviation from the above, but if this approximation accuracy is poor, the valley folds 7 interfere with each other and cannot be folded, It is necessary to pay attention to the fact that the fold 6 is displaced outward and the triangle formed by folding is greatly distorted. However, if the plastic bottle is formed of a material that allows these, it can be folded without any problem. The illustrated vertical mountain fold forming section 4
Although A should have a small interval, the interval is widened unlike the actual case in order to clarify the situation of the valley fold forming portion 5. Furthermore, as described above, in consideration of the fact that the number of the vertical mountain fold forming portions 4A increases and the number of regular polygons increases, the shape approaches the circle, and the horizontal mountain fold forming portion 4B is approximated to a circle. is there.

According to the sixth aspect of the present invention, the plastic bottle can be easily expanded and contracted. That is, as the number of corners increases, the interval between the mountain folds 6 formed by folding the horizontal mountain fold forming portion increases, so that the plastic bottle can be folded with a small number of horizontal mountain fold forming portions.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plastic bottle according to the present invention will be described below with reference to the drawings. FIG. 1 is a view for explaining an external view showing an example of a plastic bottle according to the present invention, together with a process of reducing its volume. FIG. 2 is a perspective view of a main part showing a folded state of the side wall part shown in FIG. 1 together with the inside, and FIG. 3 is an explanatory view for explaining a process of folding the side wall part.

As shown in FIG. 1, the plastic bottle has a bottom part 2, a side wall part 3, and a mouth part 1 having a smaller diameter than the side wall part 3, and is developed on the side wall part 3 in the circumferential direction. In this state, as shown in FIG. 5, a plurality of parallelograms are all formed into a congruent figure in a state where each side is continuous, and a state in which the parallelograms are laid up, down, left, and right is imagined. In the illustrated example, the parallelograms are arranged in eight rows in the circumferential direction of the side wall portion 3.
Then, a mountain fold forming part 4 that can be folded so as to protrude outward at a position corresponding to each side of each parallelogram virtually spread on the side wall part 3 is formed, for example, as shown in FIG.
As shown in (a), a section is formed so as to be bent outwardly along the side of the parallelogram so as to be easily bent outward, and the longer side of each of the parallelograms is formed. The valley fold forming portion 5 that is foldable so as to be recessed outward at a position corresponding to the diagonal line is bent inward along the diagonal line, for example, as shown in FIG. It is formed with a cross section. By forming these convex cross sections, the bending of the side wall portion 3 in one direction is facilitated, and the bending resistance of each of the fold forming portions 4 and 5 is increased.
The side wall 3 is reinforced.

The smaller corner (b) of the parallelogram formed by being surrounded by the mountain fold forming portion 4 corresponds to the number (for example, 8) of the parallelograms arranged in the circumferential direction of the side wall portion 3. The angle is set to the complement of the apex angle (a) of a regular polygon (for example, a regular octagon). According to the above example, the angle of the apex angle is a = 135 °, and thus the angle of the smaller angle is b = 55 °. Also, the parallelogram is formed in a rhombus with the four sides equal in length. As a result, the angle formed between the mountain folds 6 becomes 135 °, and the outer contour shape of a polygonal annular band described later becomes a regular octagon.
In FIGS. 1 to 3, the two fold forming portions 4 are used.
In consideration of the effect of the configuration shown in FIG. 4 of FIG. 5, the outer contour shape is shown as approximating a circle.

With the above construction, when the plastic bottle is pressed up and down while slightly twisting, as shown in FIG. 1B, each mountain fold forming portion 4 is simultaneously mountain-folded. Each valley fold forming section 5 is valley-folded, the parallelogram is folded along a diagonal line, and the mountain fold forming section is mountain-folded while the isosceles triangle is folded. Overlap with each other to form an outer contour line of a regular polygon, and the valley fold 7 formed by the valley fold forming portion 5 is valley-folded. In FIG. 2, a polygonal annular band having an inner contour line of a regular octagon is formed in a layered manner (see FIG. 2). As a result, the volume of the plastic bottle is reduced by being compressed vertically (see FIG. 1 (c)). If the lengths of the sides of the parallelogram are slightly different, the polygonal annular band is slightly shifted in the circumferential direction, but the folding of the parallelogram does not hinder the folding. .

With the above configuration, in the course of folding shown in FIG. 1B, a slight compressive strain is generated in each of the mountain fold forming sections 4 and at the same time, the valley fold forming section 5 is formed.
Since a certain amount of tensile strain occurs in the plastic bottle, this folding process is unstable. In the compressed state of the plastic bottle shown in FIG. This is a stable state since there is no in-plane distortion. Therefore, the switching between the folding and the stretching of the parallelogram is unstable, and the stretched state and the compressed state of the plastic bottle are both stable. Further, since the fold forming portions 4 and 5 act as ribs, the side wall portion 3 of the plastic bottle is strengthened against external pressure. Therefore, there is no problem in maintaining the shape even if the thickness is reduced as compared with the related art.

[Other Embodiments] <1> In the above embodiment, the mountain fold forming portion 4 is formed in a ring shape in the circumferential direction of the side wall portion 3 and the mountain fold forming portion 4 is formed in the peripheral wall portion in a helical manner at equal intervals. In the example described above, the bottom part 2 is formed in a regular polygonal shape, and the mountain fold forming part 4 is formed on the side wall part 3 as shown in FIG. The vertical mountain fold forming portion 4A and the horizontal mountain fold are formed by a vertical mountain fold forming portion 4A standing on the apex angle and a horizontal mountain fold forming portion 4B formed at equal intervals in the circumferential direction of the side wall portion 3. The parallelogram enclosed by the forming portion 4B is formed into a rectangle that is congruent with each other, and the angle between the valley fold forming portion 5 and the horizontal mountain fold forming portion 4B that is a diagonal line of the rectangle is determined by the side wall portion. 3 is inclined to the same side in the circumferential direction to form the bottom 2 It may be set so as to be approximately one half of the apex angle of the regular polygon. When the vertical mountain fold forming section 4A, the horizontal mountain fold forming section 4B, and the valley fold forming section 5 are formed as described above, the both mountain fold forming sections 4A and 4B are mountain-folded, and the valley fold forming section 5 is valley-folded. Then, the hypotenuse of the planar right-angled triangle formed is the valley fold forming portion 5 and the valley fold 7 formed here is formed.
Comes in contact with one axis. Therefore, it is possible to fold the same as shown in the above embodiment as shown in the figure. If the number of corners of the regular polygon is an even number, the mountain fold 6 obtained by mountain-folding the horizontal mountain fold forming portion 4B overlaps vertically, but if the number of corners is an odd number, they overlap every other step. Become. The number of corners of the regular polygon is preferably 5 or more, and more preferably more. That is,
As the number of the corners increases, the inclination of the valley fold forming section 5 increases, and as a result, the interval of the horizontal mountain fold forming section 4B becomes larger than the interval of the vertical mountain fold forming section 4A,
The number of steps of the horizontal mountain fold forming portion 4B can be reduced. The most preferable case is that the horizontal mountain fold forming portion 4B is formed only at the uppermost portion and the lowermost portion of the side wall portion 3. In this case, each fold forming portion 4A, 4B, 5 is formed.
In this case, the amount of distortion in the folding process becomes smaller, so that the folding becomes easier.

[Brief description of the drawings]

FIG. 1 is a perspective view also illustrating a process of reducing the volume of an example of a plastic bottle according to the present invention.

FIG. 2 is an essential part perspective view showing a side wall part in a state shown in FIG.

FIG. 3 is an explanatory view showing a process of folding a side wall portion.

FIG. 4 is a cross-sectional view illustrating an example of the structure of a fold forming unit.

5 is a development explanatory view of a side wall portion of the plastic bottle shown in FIG.

FIG. 6 is a perspective view of another example of the plastic bottle according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 mouth part 2 bottom part 3 side wall part 4 mountain fold formation part 4A vertical mountain fold formation part 4B horizontal mountain fold formation part 5 valley fold formation part

Claims (6)

[Claims] 1. A plastic bottle having a bottom portion, a side wall portion, and a mouth portion having a smaller diameter than the side wall portion, wherein a plurality of parallelograms are laid up and down and right and left in a state where each side is continuous. Forming a development figure of, and a mountain fold forming portion that can be folded so as to protrude outward at a position corresponding to each side of each of the spread parallelograms,
Furthermore, a plastic bottle having a valley fold forming portion formed on the side wall portion that is foldable so as to be recessed outward at a position corresponding to a longer diagonal line of each of the parallelograms. 2. The plastic bottle according to claim 1, wherein the parallelograms are all formed into congruent figures. 3. A smaller angle of the parallelogram is set to an angle approximate to a complement of a vertex angle of a regular polygon corresponding to the number of the parallelograms arranged in the circumferential direction of the side wall portion. The plastic bottle according to claim 1 or 2, which is provided. 4. The plastic bottle according to claim 3, wherein the lengths of the four sides of the parallelogram are equal. 5. The method according to claim 5, wherein all of the parallelograms are formed into rectangles that are congruent with each other, and a mountain fold forming portion is formed by a vertical mountain fold forming portion passing through a vertical side of the rectangle and a circumferential side of the peripheral wall portion. Along the horizontal mountain fold forming portion passing therethrough, the bottom portion is formed in a regular polygonal shape having a length of one side approximating the length of a side along the circumferential direction of the rectangular peripheral wall portion, and the valley fold forming portion and The plastic bottle according to claim 1, wherein an angle between the horizontal polygonal fold forming portion and the horizontal polygonal fold forming portion is set to be approximately one half of a vertex angle of the regular polygon. 6. The plastic bottle according to claim 5, wherein the number of corners of the regular polygon is 5 or more.