JP2008201448A - Synthetic resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin container whose body part is formed with lateral grooves extending roughly at right angles relative to the height direction for securing the rigidity of a container yet which is easily folded crosswise relative to the grooves to be crushed. <P>SOLUTION: The body part 4 is provided with a plurality of lateral grooves 8 extending roughly crossing the height direction at right angle. A protrusion 9 is formed in the grooves 8 in a manner that the side wall face of the predetermined lateral groove 8 is partially expanded and that a groove bottom face is left on the end side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a synthetic resin container that is easily crushed to reduce the volume of waste during disposal after use.

In recent years, synthetic resin containers formed by forming a synthetic resin such as polyethylene terephthalate into a bottle shape by blow molding or the like have been rapidly spread and spread as beverage containers containing various beverage products. With such widespread use, waste volume reduction has been required for disposal processing after use. In order to reduce the volume, plastic bottles that are easy to crush have been proposed.
Japanese Patent Laid-Open No. 10-203521

Here, the plastic bottle proposed in Patent Document 1 includes a plurality of horizontal ribs protruding inward and extending in the circumferential direction in the body portion, and forming a protrusion on a part of the horizontal rib. The body part can be folded at this part.
However, since the convex part formed in a part of the horizontal rib disclosed in Patent Document 1 is formed so as to divide the horizontal rib, in the convex part formed in a part of the horizontal rib, The original function of the horizontal ribs for improving the rigidity of the container ceases to function at all, resulting in a significantly disadvantageous structure for securing the rigidity.

  As described above, when a lateral groove such as the horizontal rib of Patent Document 1 is extended in a horizontal direction substantially perpendicular to the container height direction to secure the rigidity of the container, the container is folded so as to intersect with the lateral groove. On the other hand, it is difficult to crush the container, and on the other hand, as in Patent Document 1, if a convex part is formed on a part of the horizontal rib to facilitate folding, the rigidity is significantly impaired. Conventionally, it has been very difficult to solve these problems at the same time.

  The present invention has been made in view of the above circumstances, and even if a lateral groove extending in a direction substantially perpendicular to the height direction is provided in the container body to ensure the rigidity of the container, it intersects with the lateral groove. An object of the present invention is to provide a synthetic resin container that can be easily folded and crushed.

  A synthetic resin container according to the present invention that solves the above problems includes a mouth portion, a shoulder portion, a trunk portion, and a bottom portion, and the trunk portion is provided with a lateral groove extending substantially orthogonal to the height direction. In the synthetic resin container, the side wall surface of a predetermined horizontal groove of the horizontal grooves is partially bulged, and the groove bottom surface is left on the tip side, and one or a plurality of protrusions are formed in the horizontal groove. The configuration is formed.

  The synthetic resin container according to the present invention having such a configuration is such that the side wall surface of the predetermined lateral groove is partially expanded, and the protrusion is formed so as to leave the groove bottom surface on the tip side. The rigidity of the portion where the protrusion is formed is appropriately reduced without significantly impairing the rigidity. For this reason, while securing the rigidity required for the lateral groove, when a force is applied to crush the container, the portion where the protrusion is formed and weakened moderately is bent first, The container can be easily crushed by being a trigger when the container is crushed and folded.

Moreover, the synthetic resin container according to the present invention has a rectangular cross section orthogonal to the height direction of the barrel portion, and is a predetermined one of the transverse grooves provided on each of the short side surfaces of the barrel portion. It can be set as the structure which formed the said protrusion in the horizontal groove.
With such a configuration, when gripping and crushing the container, in addition to being able to easily apply a crushing force, the surface on the short side is folded and the container is crushed, Compared to the case where the long side is folded, the amount of restoration due to elasticity after folding is reduced, so that the crushed state is easily maintained.

In the synthetic resin container according to the present invention, the protrusions may be positioned on the same straight line along the height direction in two or more predetermined horizontal grooves among the plurality of horizontal grooves arranged in the height direction. It can be set as the formed structure.
With such a configuration, it becomes easier to fold along the height direction.

  As described above, in the present invention, among the lateral grooves provided in the container body portion to ensure the rigidity of the container and extending in a direction substantially orthogonal to the height direction, the side wall surface of the predetermined lateral groove is partially formed. The protrusion is formed so as to bulge out and leave the groove bottom surface on the tip side, thereby appropriately reducing the rigidity of the portion where the protrusion is formed without significantly impairing the rigidity. For this reason, while securing the rigidity required for the lateral groove, when a force is applied to crush the container, the portion where the protrusion is formed and weakened moderately is bent first, By crushing and folding the container, it becomes easy to fold and crush the container so as to intersect the lateral groove.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Fig.1 (a) is a top view which shows the outline of the synthetic resin containers based on this embodiment, FIG.1 (b) is the same front view, FIG.2 is the same side view.
A container 1 shown in these drawings includes a mouth portion 2, a shoulder portion 3, a trunk portion 4, and a bottom portion 5. A lid (not shown) is attached to the mouth portion 2. The shoulder portion 3 located between the mouth portion 2 and the trunk portion 4 is formed so as to be squeezed from the upper end of the trunk portion 4 and to be continuous with the mouth portion 2.

In the present embodiment, the container 1 has a rectangular cross section perpendicular to the height direction of the body part 4 and generally has a container shape called a square bottle.
In addition, a waist portion 43 is provided in the middle of the body portion 4 in the height direction so as to narrow down the portion. By providing such a waist part 43, the body part 4 is divided into an upper body part 41 and a lower body part 42.
Here, the height direction means a direction along a direction orthogonal to the horizontal plane when the container 1 is placed on the horizontal plane with the mouth portion 2 facing up.

  Each of the upper body part 41 and the lower body part 42 divided into upper and lower parts by the waist part 43 is provided with an internal pressure adjusting panel 6 that can be bent and deformed. The internal pressure adjusting panel 6 is, for example, filled and sealed while sterilizing the contents in the container 1 at a high temperature, and then slowly deformed inwardly of the container 1 when the pressure in the container is decreased by cooling. It is provided to adjust the pressure in the container 1 by relaxing the degree.

Further, the body 4 is provided with a plurality of lateral grooves 8 extending substantially orthogonal to the height direction in an arrangement as shown.
That is, as shown in FIG. 1 (b), the inner pressure adjusting panel 61 provided on the upper body 41 is sandwiched between the long side surfaces of the body 4 having a rectangular cross section. Lateral grooves 81 a and 81 b are provided above and below the internal pressure adjustment panel 61. Similarly, lateral grooves 82a and 82b are provided on the upper and lower sides of the internal pressure adjustment panel 62 of the lower body portion 42, respectively. Further, lateral grooves 85a, 85b, 85c, and 85d are provided in the internal pressure adjustment panel 61 of the upper body portion 41, and 86a, 86b, and 86c are provided in the internal pressure adjustment panel 62 of the lower body portion 42, respectively. .

  As shown in FIG. 2, similarly on the surface on the short side of the body 4 having a rectangular cross section, horizontal grooves 83 a and 83 b are formed above and below the internal pressure adjustment panel 63 of the upper body 41, and the lower body 42. Horizontal grooves 84 a and 84 b are respectively provided above and below the internal pressure adjustment panel 64, and in addition to this, a similar lateral groove 80 is also provided in the waist portion 43. Further, the inner pressure adjustment panel 63 of the upper body portion 41 has lateral grooves 87a, 87b, 87c, 87d, the inner pressure adjustment panel 64 of the lower body portion 42 has lateral grooves 88a, 88b, 88c, and so on. Similarly, transverse grooves 8 are also provided in 63 and 64.

  FIG. 1B is a front view of the container 1, but the back side of the container 1 is formed the same as the front side. Moreover, FIG. 2 is a side view of the container 1, but the left and right side surfaces of the container 1 are also formed in the same manner.

  The lateral groove 8 provided in the body portion 4 includes side wall surfaces rising from both end edges of the groove bottom surface along the extending direction. In the present embodiment, the lateral groove 8 provided in the body portion 4 Of these, the lateral grooves 8 provided on the short side surface are formed with protrusions 9 on the respective side wall surfaces facing each other by partially bulging the side wall surfaces. At this time, it is important to leave a groove bottom on the tip side of the protrusion 9 so that the horizontal groove 8 is not divided into right and left by the protrusion 9 formed in the horizontal groove. To do.

  Here, FIG. 3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line BB in FIG. 4A is a cross-sectional view taken along the line CC in FIG. 2, and FIG. 4B is a cross-sectional view taken along the line DD in FIG. Further, FIG. 5 is an enlarged view of a main part of the internal pressure adjusting panel 63 provided in the upper body portion 41 of the container 1 and the lateral grooves 83a and 83b provided above and below the inner pressure adjusting panel 63. FIG. (B) EE sectional drawing and FIG.5 (c) are FF sectional drawings of FIG.5 (b).

  As shown in these drawings, in the present embodiment, two protrusions 9 bulge from the upper side wall surface in all the lateral grooves 8 provided on the short side surface of the body portion 4. Two pairs of protrusions 9 that are vertically opposed to each other are formed on the short side surface of the body 4 so that the two protrusions 9 bulge from the lower side wall surface so as to be paired with these. They are formed so as to be positioned on the same straight line along the height direction so as to be arranged in two rows close to the vicinity of the center in the width direction.

In the container 1 having the above-described configuration, the lateral groove 8 provided in the body portion 4 is provided mainly for imparting rigidity to the container 1 due to its three-dimensional shape.
For this reason, a container provided with such a lateral groove is generally enhanced in rigidity by the lateral groove even when an attempt is made to crush the container in order to reduce its volume when the used container is disposed of. For this reason, it is difficult to crush the container so as to be folded across the transverse groove.

  On the other hand, in the present embodiment, as described above, the side wall surface of the predetermined lateral groove 8 is partially expanded, and the protrusion 9 is formed so as to leave the groove bottom surface on the tip side. By doing so, the rigidity of the site | part in which the protrusion 9 was formed is reduced moderately, without impairing remarkably. That is, in this embodiment, by forming the protrusion 9 in the horizontal groove, the groove width of the horizontal groove 8 in the portion where the protrusion 9 is formed is reduced in a pseudo manner, and the degree of rigidity exhibited by the horizontal groove 8 is increased. By partially adjusting and leaving the bottom surface of the groove on the tip side of the protrusion 9, it is effective that the horizontal groove 8 is divided into left and right by the protrusion 9 and the rigidity of the horizontal groove 8 is significantly impaired. It is avoiding.

For this reason, according to the present embodiment, when the force required to crush the container 1 is applied while securing the rigidity required for the lateral groove 8, a portion where the protrusion 9 is formed and is moderately weakened. Is bent first, and the part is made to become a trigger when the container 1 is crushed and folded, so that the container 1 can be easily crushed.
That is, the rigidity of the lateral groove 8 is correlated with the width of the groove bottom surface (the length in the direction orthogonal to the longitudinal direction of the lateral groove 8), and the portion where the protrusion 9 is formed has a short groove bottom width, Since it is weak, the stress is concentrated by the force applied to crush the container 1, and the groove bottom is more easily bent than other parts that are continuous with a certain width.
In the example described above, the portion where the protrusion 9 is formed along the height direction on the surface on the short side of the opposite body portion 4, that is, the portion surrounded by the chain line in FIG. The container 1 functions as a folding part FL, and the container 1 is crushed so that the surface on the short side of the body part 4 is folded into a mountain fold along the folding part FL.

Moreover, in this embodiment, the protrusion 9 is formed in the horizontal groove 8 provided in the surface of the short side of the trunk | drum 4, so that the surface of the short side of the trunk | drum 4 may be folded and the container 1 may be crushed. The reason for this is as follows.
If the short side surface is configured to be folded, for example, if the thumb 1 is applied to one surface of the long side and the remaining finger is applied to the other surface and the container 1 is grasped and crushed, it is crushed It can make it easier to apply force. In addition to this, when the surface on the short side is folded and crushed, the amount of restoration due to elasticity after folding is reduced compared to the case where the long side is folded. It becomes easy to keep the state.
The surface on the long side has a relatively low rigidity due to the larger area compared to the surface on the short side, and protrudes into the lateral groove 8 provided to give rigidity to such a surface. It is not preferable to form the portion 9 to reduce the degree of rigidity. From this point of view, it is preferable that the surface on the short side is folded.

Of the lateral grooves 8 provided in the body part 4, which lateral groove 8 is to be formed with the protrusion 9 depends on the specific form such as the shape and capacity of the container 1 and how the container 1 is folded. It can be set appropriately according to the above, and is not limited to the illustrated example. As long as the container 1 is easy to be crushed by the force applied when the container 1 is crushed, it becomes a trigger when the portion where the protrusion 9 is formed is bent and folded first, There may be only one lateral groove 8 in which the protrusion 9 is formed.
However, it is preferable that the plurality of horizontal grooves 8 are arranged in the height direction, and the protrusions 9 are formed in two or more predetermined horizontal grooves 8 so as to be positioned on the same straight line along the height direction. In this way, the container 1 can be easily folded along the height direction.

  In addition, the shape and size of the protrusion 9 formed by projecting into the lateral groove is also moderately reduced with respect to the adjacent portion without significantly impairing the rigidity of the portion where the protrusion 9 is formed. If the container 1 is bent before the other part due to the force applied to crush the container 1, and the desired rigidity is exhibited in a normal use state. There is no particular limitation.

However, the shape of the protrusion 9 is designed in consideration of formability, and is preferably a shape having good shapeability such as a semicircular shape or a V-shape as illustrated.
In order to moderately weaken the portion where the protrusions 9 are formed while ensuring the rigidity required for the lateral grooves 8, when the protrusions 9 are formed, 0. It is preferable that the bottom surface of the groove is left with a width of 5 to 1.5 mm, and a width of about 1 mm is more preferable.
In addition, in order to concentrate stress on the portion where the protrusion 9 is formed and to bend more easily than other portions, the width of the groove bottom surface left on the tip side of the protrusion 9 is the groove bottom surface of the other portion. It is preferable to set it to 1/2 or less of the width.

The container 1 in the present embodiment as described above has a predetermined shape by, for example, biaxially stretching blow-molding a bottomed cylindrical preform made of a thermoplastic resin manufactured by known injection molding or extrusion molding. Can be molded.
As the thermoplastic resin, any resin can be used as long as stretch blow molding is possible. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polylactic acid or copolymers thereof, those blended with these resins or other resins are suitable. It is. In particular, an ethylene terephthalate thermoplastic polyester such as polyethylene terephthalate is preferably used. Further, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can be used.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

For example, in the above-described embodiment, the two pairs of protrusions 9 that are vertically opposed to each other are arranged in two rows. However, as shown in FIG. They may be formed so as to face each other vertically, and these may be arranged in a line.
Further, the protrusion 9 formed in the lateral groove 8 is not limited to a form in which the two protrusions 9 are vertically opposed to each other, and at least one of the upper side wall surface and the lower side wall surface of the horizontal groove 8. As shown in FIG. 8, the lateral groove 8 formed with one protrusion 9 and the lateral groove 8 formed with two protrusions as a pair facing up and down, as shown in FIG. May be mixed. Although not shown in particular, the protrusions 9 formed on the upper side wall surface of the lateral groove 8 and the protrusions 9 formed on the lower side wall surface do not face each other and are not so far away from each other. You may make it form in a zigzag form in a position.

  Moreover, in embodiment mentioned above, although the cross section of the trunk | drum 4 gave the example of the square bottle with a rectangular shape, the specific form of the container 1 is not restricted to this. For example, the present invention can also be applied to a square bottle having another polygonal cross section of the body 4 or a round bottle having a circular cross section of the body 4.

  Further, in describing the above-described embodiment, the illustrated container 1 has a capacity of 2000 ml, but the present invention can be applied to this type of synthetic resin container without regard to the volume.

  As described above, the present invention provides a synthetic resin container that can be easily crushed to reduce the volume of waste during disposal after use.

It is explanatory drawing which shows the outline of embodiment of the synthetic resin containers based on this invention. It is a side view showing the outline of the embodiment of the synthetic resin container concerning the present invention. It is explanatory drawing which shows the longitudinal cross-section of embodiment of the synthetic resin containers based on this invention. It is explanatory drawing which shows the cross section of embodiment of the synthetic resin containers based on this invention. It is explanatory drawing which expanded the principal part of embodiment of the synthetic resin containers which concern on this invention. It is explanatory drawing which shows the site | part used as a fold line in embodiment of the synthetic resin container which concerns on this invention. It is explanatory drawing which shows the site | part used as a fold line in other embodiment of the synthetic resin containers based on this invention. It is explanatory drawing which shows the site | part used as a fold line in other embodiment of the synthetic resin containers based on this invention.

Explanation of symbols

1 container 2 mouth 3 shoulder 4 trunk 5 bottom 8 transverse groove

Claims (3)

In a synthetic resin container comprising a mouth, a shoulder, a body, and a bottom, the body having a lateral groove extending substantially orthogonal to the height direction,
A composite characterized in that one or a plurality of protrusions are formed in the lateral groove so that a side wall surface of a predetermined lateral groove of the lateral groove is partially bulged and a groove bottom surface is left on the tip side. Resin container. The cross section perpendicular to the height direction of the trunk is rectangular,
The synthetic resin container according to claim 1, wherein the protrusion is formed in a predetermined lateral groove among the lateral grooves provided on each of the short-side surfaces of the body portion.   3. The projection according to claim 1, wherein the protrusion is formed in two or more predetermined horizontal grooves among the plurality of horizontal grooves arranged in the height direction so as to be positioned on the same straight line along the height direction. The synthetic resin container described in 1.

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