WO2019003810A1

WO2019003810A1 - Synthetic resin container

Info

Publication number: WO2019003810A1
Application number: PCT/JP2018/021383
Authority: WO
Inventors: 田中　敏正
Original assignee: 株式会社吉野工業所
Priority date: 2017-06-30
Filing date: 2018-06-04
Publication date: 2019-01-03
Also published as: EP3647214A4; JP2019011116A; EP3647214A1; US20210139185A1

Abstract

A synthetic resin container (1) comprising an opening (10), a shoulder part (11), a trunk part (12), and a bottom part (13), the container (1) forming an accommodation space for contents, wherein: a pair of convex ribs (16, 17) capable of bending when the shoulder part (11) is flattened are disposed on the shoulder part (11) so as to face the front-surface side and the rear-surface side and sandwich the central axis (C) of the container (1); each of the pair of convex ribs (16, 17) has a curved-line shape in which, in a front-surface view or a rear-surface view, a central portion (16a, 17a) is formed convexly toward the opening (10); and the two end parts of one convex rib (16) from among the pair of convex ribs (16, 17) is connected to the respective two end parts of the other convex rib (17) at an intermediate position on the shoulder part (11).

Description

Plastic container

The present invention relates to a foldable synthetic resin container having a mouth, a shoulder, a body, and a bottom.

Conventionally, as a container for containing various contents such as beverages, cosmetics, medicines, detergents and toiletries such as shampoos, a synthetic resin as represented by a bottle made of polypropylene (PP) or a bottle made of polyethylene terephthalate (PET) Containers are used.

Such a container includes, for example, a cylindrical mouth, a shoulder extending below the mouth, a body extending to the shoulder, and a bottom closing the lower end of the body. It can be formed by blow molding such as biaxial stretch blow molding using a tubular shape preform, or extrusion blow molding using a parison extruded into a cylindrical shape.

For example, in Patent Document 1, a cylindrical parison is set in a mold for blow molding, and a pressurized fluid is supplied to the inside of the parison to make the parison into a container having a predetermined shape along the cavity of the mold. A blow molding method for molding is described.

Patent No. 3993759 gazette

By the way, for example, as in the case of the container described in the above-mentioned Patent Document 1, in order to reduce the volume at the time of discarding after the contents are used up, it is possible to crush and fold the body part. Things have been proposed. By making the container foldable in this way, not only the volume at the time of disposal is reduced, but also in the case of a container used for highly viscous contents, the residual amount of the contents is also reduced. It becomes possible.

However, in the case of forming the container formed by blow molding as described above in a foldable manner, there is a problem that the shoulder portion is easily formed relatively thick, and it is difficult to fold the shoulder portion.

Therefore, an object of the present invention is to provide a synthetic resin container whose shoulder can be easily folded.

The container made of synthetic resin of the present invention is a container made of synthetic resin which comprises a mouth, a shoulder, a body, and a bottom, and which forms a storage space for contents.
The shoulder portion is provided with a pair of convex ribs which are disposed opposite to each other on the front side and the back side across the central axis of the container and which can be bent when the shoulder portion is crushed,
Each of the pair of convex ribs has a curved line shape in which a central portion is convex toward the mouth in a front view or a rear view,
The two end portions of one convex rib in the pair of convex ribs are respectively connected to the both end portions of the other convex rib at an intermediate position of the shoulder portion.

In the synthetic resin container of the present invention, preferably, the body has a flat shape having a width larger than a thickness.

Moreover, in the synthetic resin container of the present invention, it is preferable that the central portion of each of the convex ribs is adjacent to the proximal end portion of the mouth portion.

Further, in the case of the synthetic resin container of the present invention, a triangular flat surface is provided on a pair of connecting portions where the both end portions of the one convex rib and the both ends of the other convex rib are respectively connected. Is preferred.

According to the present invention, it is possible to provide a synthetic resin container whose shoulder can be easily folded.

It is a perspective view of a synthetic resin container concerning one embodiment of the present invention. It is a front view of the synthetic resin container of FIG. It is a side view of the synthetic resin container of FIG. It is a top view of the synthetic resin container of FIG. It is a bottom view of the synthetic resin container of FIG. It is a side view which shows a mode that the synthetic resin container of FIG. 1 is folded. It is a perspective view of a synthetic resin container according to another embodiment of the present invention. It is a front view of the synthetic resin container of FIG. It is a side view of the synthetic resin container of FIG. It is a top view of the synthetic resin container of FIG. It is a bottom view of the synthetic resin container of FIG. It is a front view which shows a mode that the synthetic resin container of FIG. 7 is folded.

Hereinafter, the present invention will be more specifically illustrated and described with reference to the drawings.

The synthetic resin container 1 according to the embodiment of the present invention shown in FIGS. 1 to 5 (hereinafter also referred to as “container 1”) is connected to the cylindrical opening 10 and the lower end of the opening 10 and is radially outside , And a bottom portion 13 connected to a lower end portion of the body portion 12. The shoulder 11 is connected to the lower side of the mouth 10 via a bending portion or a bending portion, and the angle with respect to the central axis C of the container 1 is different from that of the mouth 10. The body 12 extends below the shoulder 11 via a bending portion or a bending portion, and the angle with the shoulder 11 is different from that of the central axis C. The inside of the container 1 is a storage space for contents. 2 is a front view of the container 1 as viewed from one side in the short axis direction of the flat trunk 12. FIG. 3 is a view of the container 1 from one side in the longitudinal direction of the trunk 12. Side view.

The mouth portion 10 is formed in a cylindrical shape, and an external thread 10a for mounting a cap or a pouring stopper is provided on the outer peripheral surface thereof. Further, a neck ring 10b is provided below the male screw 10a, and for example, the container 1 can be transported by supporting the neck ring 10b from below by a transport device. Further, the tip end opening 10c of the mouth 10 is an outlet for the contents, and can be closed by attaching a cap or the like to the mouth 10.

The shoulder portion 11 connects the mouth portion 10 and the body portion 12 and gradually expands in diameter downward from the mouth portion 10 side to the body portion 12 side. In the present example, the shoulder portion 11 is constituted by a substantially flat inclined surface whose outline is linear in a front view (see FIG. 2) and a side view (see FIG. 3), but is limited thereto For example, it may be in the shape of a dome that bulges out of the container 1.

The shoulder portion 11 has a pair of

convex ribs

16 and 17 disposed opposite to each other on the front side and the rear side with respect to the central axis C. In the present example, the central axes of the mouth 10, the shoulder 11, the body 12 and the bottom 13 coincide with the central axis C of the container 1. The

respective convex ribs

16 and 17 are formed to project from the outer surface of the shoulder 11 to the outside of the container, and the inner surface of the shoulder 11 is formed with a recess corresponding to the

convex ribs

16 and 17. Further, the

convex ribs

16 and 17 are formed in a curved line shape in which the

central portions

16 a and 17 a are convex toward the mouth 10 side (upper side). Both ends of one of the pair of

convex ribs

16 and 17 are connected to both ends of the other convex rib 17 at an intermediate position of the shoulder portion 11. The “intermediate position of the shoulder 11” means the position in the region between the end (upper end) on the mouth 10 side of the shoulder 11 and the end (lower end) on the trunk 12 side. Do. As shown in the perspective view of FIG. 1 and the side view of FIG. 3, the connecting portion 18 between the both end portions of one convex rib 16 and the both end portions of the other convex rib 17 has a bent portion convex downward in side view. Configured.

Such a pair of

convex ribs

16 and 17 become a starting point of bending of the wall surface of the shoulder 11 when the shoulder 11 and the body 12 are crushed in the thickness direction. That is, the shoulder 11 can be easily bent along the

convex ribs

16 and 17.

The

central portion

16 a, 17 a of each of the pair of

convex ribs

16, 17 is adjacent to the proximal end of the mouth 10. The portion of the shoulder 11 adjacent to the proximal end of the mouth 10, that is, the upper end of the shoulder 11 tends to be thick and difficult to deform, but the upper end is a convex rib 16 serving as a starting point of bending. By arranging the central portion 16a of the above, deformation can be facilitated, and an effect of suppressing thickening can also be obtained.

The body 12 has a flat shape having a width (length in the long axis direction of the body 12) larger than a thickness (length in the short axis direction of the body 12), as shown in the plan view of FIG. It has become. In the cross section perpendicular to the central axis C in the body 12, the short axis direction is the thickness direction, and the long axis direction perpendicular to the short axis direction is the width direction. In addition, the trunk | drum 12, the shoulder 11, and the bottom 13 may have a part which is not flat (part which becomes the same in thickness and width) in the part, The part (thickness and width) which is the whole is not flat May be identical to each other). In FIG. 4, the maximum thickness of the body 12 is indicated by T, and the maximum width is indicated by W.

The body 12 has a front wall 12 a and a back wall 12 b opposite in the thickness direction with the central axis C interposed therebetween. At the boundary between the front wall 12a and the back wall 12b, a vertical fold line portion 12c is provided which functions as a fold in the form of a mountain fold when the body 12 is crushed. Thereby, the trunk | drum 12 can be easily crushed in the thickness direction (short axis direction) so that the front wall 12a and the back wall 12b may be closely approached. In addition, in this example, the vertical folding line part 11a is provided also in the shoulder part 11 so as to continue to the vertical folding line part 12c, and the vertical folding line part 11a functions as a fold like a mountain fold. The vertical fold line portion 11 a is connected to the end of the

convex ribs

16 and 17. Thereby, the body 12 and the shoulder 11 can be more easily crushed in the thickness direction. In the present example, when the shoulder 11 and the body 12 are crushed in the thickness direction, the vertical fold line 12c and the vertical fold line 11a are displaced outward in the width direction as a fold in the form of a mountain fold. The container 1 may be configured to be folded so that the vertical folding line portion 12 c and the vertical folding line portion 11 a are folded inward in the width direction. In the present example, the vertical fold line portion 12c and the vertical fold line portion 11a are formed in a convex rib shape, but may be in a concave groove shape.

The body portion 12 is provided with a transverse fold line portion 14 extending in the circumferential direction of the body portion 12. When the body portion 12 is crushed in the thickness direction, the lateral folding line portion 14 functions as a valley fold-like fold, and the lateral folding line portion 14 can be used as a folding starting point. The transverse fold line portion 14 can also function as a fold in the form of a mountain fold. In addition, although the horizontal bending line part 14 is comprised by concave groove shape in this example, it may be convex rib shape.

In the present example, the transverse bending line portion 14 is provided in the lower half (the half on the bottom 13 side) of the body 12 and is provided in the same shape on the front wall 12a and the rear wall 12b. . The pair of lateral fold line portions 14 disposed opposite to each other in the thickness direction of the body 12 as described above are connected to each other at the boundary portion (vertical fold line portion 12c) between the front wall 12a and the rear wall 12b. In addition, the horizontal bending line part 14 is not an essential structure. Further, the transverse bending line portion 14 may be provided on the upper half of the body portion 12 or a plurality of transverse bending line portions 14 may be provided at intervals in the height direction of the container 1. In addition, the lateral bending line portion 14 may be configured to extend only to a part of the trunk portion 12 in the circumferential direction. Alternatively, the transverse fold line portion 14 may be provided only on either one of the front wall 12a and the back wall 12b. In addition, in the side view shown in FIG. 3, the horizontal bending line portion 14 forms a concave bending portion in the thickness direction of the trunk portion 12.

The bottom portion 13 closes the lower end portion of the cylindrical body portion 12 and forms a flat contact surface (bottom surface) which can be grounded in the upright posture shown in FIGS. As shown in FIG. 5, in the central portion of the bottom portion 13, a concave portion 13 a that is concave toward the inside of the container 1 is formed. In the present example, the recess 13a is a substantially hemispherical curved surface. Further, in the bottom portion 13, a pair of groove portions 13b extending in the width direction (long-axis direction) is formed at the center position in the thickness direction. The groove 13 b extends from the bottom 13 to the lower portion of the body 12. The groove 13 b functions as a valley fold when the bottom 13 is folded. That is, the container 1 of this example is configured such that the bottom portion 13 can be folded so that the pair of groove portions 13 b is folded into the inside of the container 1. At this time, the fold line portion 15 provided at the boundary between the body portion 12 and the bottom portion 13 functions as a fold in the form of a mountain fold. In the present example, the fold line portions 15 are respectively provided on the front side and the back side of the container 1. In addition, the recessed part 13a, the groove part 13b, the fold line part 15 grade | etc., Is not an essential structure, and the shape of the bottom part 13 can be changed suitably.

Here, the container 1 is formed by blow molding such as biaxial stretch blow molding, for example. Specifically, for example, a barrel of a bottomed cylindrical (test tubular) preform heated to a predetermined temperature at which stretchability is expressed using a heater or the like is disposed in a cavity of a mold, and the preform is The preform can be formed into a container of a predetermined shape along the inner surface of the cavity of the mold by supplying a gas or liquid at a predetermined pressure through the nozzle to the inside of the mold. The preform can be obtained, for example, by performing injection molding, extrusion blow molding, extrusion molding or the like using a thermoplastic resin such as polypropylene (PP) or polyethylene terephthalate (PET) as a raw material. Further, the preform is provided with a cylindrical portion having a bottom with a bottom and a mouth portion connected to the body portion, the mouth portion is formed in a cylindrical shape, and a male screw portion is integrally provided on the outer peripheral surface. The body portion is formed in a test tube having a circular cross section extending along the axial direction, and is provided coaxially with and integrally with the port portion below the port portion.

As described above, in the container 1 of the present embodiment, the pair of

convex ribs

16 and 17 are disposed opposite to each other on the front side and the rear side with the central axis C in the shoulder portion 11. As shown in FIG. 6, when the shoulder 11 is crushed from the front side and the back side, the pair of

convex ribs

16 and 17 serves as a base point of bending, and the shoulder 11 can be easily folded. Further, by connecting both end portions of the pair of

convex ribs

16 and 17 at the middle position of the shoulder portion 11, the shoulder portion 11 can be easily folded to the middle position of the shoulder portion 11. Therefore, according to the container 1 of the present embodiment, not only the volume at the time of disposal can be reduced, but particularly in the case of a container used for highly viscous contents, it remains at the middle position of the shoulder portion 11 Since the contents can be squeezed out, the amount of contents remaining can be reduced. The container 1 of the present embodiment is suitable for a refilling container in which the content is refilled into a container dedicated to content discharge and the like.

In the container 1 of the present embodiment, the folding of the shoulder portion 11 is further facilitated by providing the vertical folding line portion 11 a below the connecting portion 18 of the pair of

convex ribs

16 and 17. it can.

Moreover, in the container 1 of the present embodiment, the trunk portion 12 and the shoulder portion 11 are easily crushed in the thickness direction by forming the trunk portion 12 into a flat shape having a width larger than the thickness. As a result, the entire container 1 including the shoulder portion 11 can be further easily folded. For the same reason, as in the present embodiment, it is preferable that the shoulder 11 be flat as in the case of the trunk 12.

Further, in the container 1 of the present embodiment, since the

central portions

16a and 17a of the respective

convex ribs

16 and 17 are adjacent to the proximal end of the mouth 10, the vicinity of the proximal end of the mouth 10 is obtained. The shoulder 11 can be folded. Therefore, the volume reduction effect by folding shoulder 11 and the residual amount reduction effect of contents can be further improved.

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 7 to 12. In addition, the same code | symbol is attached | subjected in the figure to the part in which the basic function is the same as embodiment mentioned above, and description is abbreviate | omitted.

The container 2 shown in FIGS. 7 to 12 is provided with a triangular flat surface 21 at a pair of connecting portions 18 in which both end portions of one convex rib 16 and both end portions of the other convex rib 17 are respectively connected. There is. The triangular flat surface 21 has two

sides

21 b and 21 b that correspond to the

convex ribs

16 and 17, and an upper side 21 a connecting both ends of the pair of

sides

21 b and 21 b. Also, the container 2 is provided with a vertically convex rib 22 extending from the shoulder 11 to the body 12. Each of the vertical convex ribs 22 is formed to protrude from the outer surface of the shoulder 11 or the trunk 12 to the outside of the container, and a recess corresponding to the vertical convex rib 22 is formed on the inner surface of the shoulder 11 or the trunk 12 ing. The vertical convex rib 22 can function as a fold in the form of a mountain fold or valley fold when the shoulder 11 and the body 12 are crushed to fold the container 2. Two vertical convex ribs 22 are disposed opposite to each other on the front side and the rear side. The upper ends of the four vertical convex ribs 22 are respectively connected to the upper side 21 a of the flat surface 21 having a triangular shape. That is, the upper ends of the four vertical convex ribs 22 are configured to be connected to one convex rib 16 or the other convex rib 17, respectively.

As shown in FIG. 12, in the container 2 of the present embodiment, the shoulder 11 and the body 12 are arranged in the thickness direction (front side while folding the vertical folding line 12 c and the vertical folding line 11 a into the inside of the container 2 And the container 2 can be folded by crushing (from the back side). In this case, the vertical fold line portions 12c and the vertical fold line portions 11a function as valley fold folds, and the four vertical convex ribs 22 function as mountain fold folds. Further, the upper side 21a of the triangular flat surface 21 functions as a mountain-folded fold, the two sides 21b other than the upper side 21a function as a valley-folded fold, and the flat surface 21 is folded inside the container 2 Will be In this case, the container 2 can be folded while reducing its width. In this example, the surface of the flat surface 21 is located on the same surface as the convex ribs 16 and 17 (is configured to have the same height), but is flatter than the

convex ribs

16 and 17. The surface of 21 may be high or low. Moreover, it may replace with the triangular-shaped flat surface 21, and may provide only the convex rib corresponded to the upper side 21a.

As shown in FIGS. 9 and 11, the pair of groove portions 13b formed in the bottom portion 13 is formed in a substantially V-shape. Each substantially V-shaped groove portion 13b extends from the bottom portion 13 to the lower portion of the body portion 12, and has a vertex (bending in the vicinity of the lower portion of the body portion 12 (near the widthwise end in the bottom view shown in FIG. 11) Department) is located. The groove 13 b functions as a valley fold when the bottom 13 is folded while the vertical folding line 12 c is folded into the inside of the container 2.

In addition, it is also possible to crush and fold the shoulder part 11 and the trunk | drum 12 like the previous embodiment in the container 2 of this embodiment. That is, the container 2 can be folded so that the vertical folding line 12 c of the body 12 and the vertical folding line 11 a of the shoulder 11 are displaced to the outside in the width direction of the container 2.

As described above, also in the container 2 of the present embodiment, the shoulder 11 can be easily folded.

The foregoing merely shows one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, in place of the male screw 10a of the mouth 10, a projection for undercut engagement with a cap or the like may be provided. In this case, for example, a cap or the like can be attached to the mouth 10 by plugging. Further, in the container 1 of this example, the shoulder 11, the body 12, and the bottom 13 are symmetrical (longitudinal symmetry) in the thickness direction and symmetrical (left and right symmetrical) in the width direction. However, any or all of the shoulder portion 11, the body portion 12 and the bottom portion 13 may be asymmetrical, or may be asymmetrical. Further, the bottom portion 13 may be configured so as not to constitute a ground surface capable of being grounded in an upright state, and may be configured, for example, by a hemispherical curved surface that bulges downward.

Reference Signs List 1: 2, synthetic resin container 10: mouth 10a: male screw 10b: neck ring 10c: tip opening 11: shoulder 11a: vertical fold line 12: body 12a: front wall 12b: back wall 12c: vertical fold line 13 : Bottom part 14: Horizontal fold line part 15: Fold line part 16, 17:

Convex rib

16a, 17a: Central part 18: Connection part 21: Flat surface 21a: Top side 22: Vertical convex rib C: Central axis

Claims

A container made of synthetic resin, having a mouth, a shoulder, a body, and a bottom and forming a storage space for contents,
The shoulder portion is provided with a pair of convex ribs which are disposed opposite to each other on the front side and the back side across the central axis of the container and which can be bent when the shoulder portion is crushed,
Each of the pair of convex ribs has a curved line shape in which a central portion is convex toward the mouth in a front view or a rear view,
The synthetic resin container, wherein both ends of one convex rib in the pair of convex ribs are respectively connected to both ends of the other convex rib at an intermediate position of the shoulder.
The synthetic resin container according to claim 1, wherein the body has a flat shape having a width larger than a thickness.
The synthetic resin container according to claim 1, wherein a central portion of each of the convex ribs is adjacent to a proximal end of the mouth.
The flat surface of a triangle shape is provided in a pair of connection part which each connects the both ends of said one convex rib, and the both ends of said other convex rib in any one of Claims 1-3. Container made of synthetic resin as described.