JP2019011116A - Container made of synthetic resin - Google Patents

Abstract

To provide a synthetic resin container capable of easily folding a shoulder portion. A synthetic resin container 1 having a mouth part 10, a shoulder part 11, a body part 12, and a bottom part 13 and forming a content storage space, the shoulder part 11 having a central axis of the container 1 A pair of convex ribs 16 and 17 are provided so as to be opposed to the front side and the rear side across C, and can be bent when the shoulder portion 11 is crushed, and each of the pair of convex ribs 16 and 17 is a front view. Or, when viewed from the back, the central portions 16a and 17a are curved linearly convex toward the mouth portion 10 side, and both end portions of one convex rib 16 in the pair of convex ribs 16 and 17 are respectively in the shoulder portion 11. It connects with the both ends of the other convex rib 17 in the intermediate position. [Selection] Figure 1

Description

  The present invention relates to a synthetic resin container that has a mouth portion, a shoulder portion, a trunk portion, and a bottom portion and is foldable.

  Conventionally, synthetic containers such as polypropylene (PP) bottles and polyethylene terephthalate (PET) bottles have been used as containers for various contents such as beverages, cosmetics, chemicals, detergents, toiletries such as shampoos. Made of containers.

  Such a container includes, for example, a cylindrical mouth, a shoulder continuous below the mouth, a trunk connected to the shoulder, and a bottom closing the lower end of the trunk. It can be formed by blow molding such as biaxial stretch blow molding using a tubular 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 blow molding die, and a pressurized fluid is supplied to the inside of the parison so that the parison is placed in a container having a predetermined shape along the cavity of the die. A blow molding method for molding is described.

Japanese Patent No. 3993759

  By the way, like the container described in the above-mentioned Patent Document 1, after the contents are used up, the body part can be folded and collapsed to reduce the volume when discarded. Things have been proposed. In this way, by making the container foldable, not only the volume at the time of disposal is reduced, but also in the case of containers used for highly viscous contents, it is possible to reduce the residual amount of contents. It becomes possible.

  However, when the container formed by blow molding as described above is formed so as to be foldable, there is a problem that the shoulder portion is easily formed to be 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 in which a shoulder can be easily folded.

The synthetic resin container of the present invention is a synthetic resin container that includes a mouth portion, a shoulder portion, a trunk portion, and a bottom portion, and forms an accommodation space for contents.
The shoulder portion is disposed to face the front side and the back side across the central axis of the container, and is provided with a pair of convex ribs that 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 side in a front view or a rear view,
Both ends of one convex rib of the pair of convex ribs are connected to both ends of the other convex rib at an intermediate position of the shoulder.

  In the synthetic resin container of the present invention, it is preferable that the trunk portion has a flat shape having a width larger than the thickness.

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

  Further, in the synthetic resin container of the present invention, a triangular flat surface is provided at a pair of connecting portions where the both end portions of the one convex rib and the both end portions of the other convex rib are respectively connected. It is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the synthetic resin container which can fold a shoulder part easily can be provided.

It is a perspective view of the 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 the synthetic resin container which concerns on other embodiment of this 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 described in more detail with reference to the drawings.

  A synthetic resin container 1 (hereinafter also referred to as “container 1”) according to an embodiment of the present invention shown in FIGS. 1 to 5 is connected to a cylindrical mouth portion 10 and a lower end portion of the mouth portion 10 in a radially outer side. A shoulder portion 11 extending to the outer peripheral edge of the shoulder portion 11 and extending downward, and a bottom portion 13 continuing to the lower end portion of the trunk portion 12. The shoulder portion 11 is connected to a lower portion of the mouth portion 10 through a bent portion or a curved portion, and is configured such that an angle with respect to the central axis C of the container 1 is different from that of the mouth portion 10. The trunk portion 12 is connected to the lower portion of the shoulder portion 11 via a bent portion or a curved portion, and is configured so that an angle with respect to the central axis C is different from the shoulder portion 11. The interior of the container 1 is a content storage space. 2 is a front view of the container 1 as viewed from one side in the minor axis direction of the flat barrel 12, and FIG. 3 is a diagram of the container 1 as viewed from one side in the major axis direction of the barrel 12. FIG.

  The mouth portion 10 is formed in a cylindrical shape, and a male screw 10a for mounting a cap or a spout plug is provided on the outer peripheral surface thereof. A neck ring 10b is provided below the male screw 10a. For example, the container 1 can be transported by supporting the neck ring 10b from below by a transport device. Moreover, the front-end | tip opening 10c of the opening | mouth part 10 serves as the outflow port of the content, and can be obstruct | occluded by attaching a cap etc. to the opening | mouth part 10. FIG.

  The shoulder portion 11 connects the mouth portion 10 and the trunk portion 12 and gradually increases in diameter from the mouth portion 10 side to the trunk portion 12 side downward. In this example, the shoulder portion 11 is configured by a substantially flat inclined surface whose contour line is linear in a front view (see FIG. 2) and a side view (see FIG. 3), but is not limited thereto. Instead, for example, it may be a dome that bulges outside the container 1.

  The shoulder portion 11 has a pair of convex ribs 16 and 17 disposed to face the front side and the back side across the central axis C. In this example, the center axis of each of the mouth portion 10, the shoulder portion 11, the trunk portion 12 and the bottom portion 13 coincides with the center axis C of the container 1. Each convex rib 16, 17 is formed so as to protrude from the outer surface of the shoulder portion 11 to the outside of the container, and a concave portion corresponding to the convex rib 16, 17 is formed on the inner surface of the shoulder portion 11. Moreover, the convex ribs 16 and 17 are comprised by the curved line shape from which the center parts 16a and 17a become convex toward the opening | mouth part 10 side (upper side). Both ends of one convex rib 16 of the pair of convex ribs 16 and 17 are respectively connected to both ends of the other convex rib 17 at an intermediate position of the shoulder 11. The “intermediate position of the shoulder portion 11” means a position in the region between the end portion (upper end portion) on the mouth portion 10 side and the end portion (lower end portion) on the trunk portion 12 side of the shoulder portion 11. To do. As shown in the perspective view of FIG. 1 and the side view of FIG. 3, the connecting portion 18 between both end portions of one convex rib 16 and both end portions of the other convex rib 17 has a bent portion protruding downward in side view. It is composed.

  Such a pair of convex ribs 16 and 17 serve as a starting point for bending the wall surface of the shoulder portion 11 when the shoulder portion 11 is crushed together with the body portion 12 in the thickness direction. That is, the shoulder 11 can be easily bent along the convex ribs 16 and 17.

  The central portions 16 a and 17 a of the pair of convex ribs 16 and 17 are adjacent to the proximal end portion of the mouth portion 10. In the shoulder portion 11, the portion adjacent to the base end portion of the mouth portion 10, that is, the upper end portion of the shoulder portion 11 tends to be formed thick and difficult to be deformed, but the convex rib 16 serving as a starting point of bending at the upper end portion. By arranging the central portion 16a, it is possible to facilitate the deformation and to obtain an effect of suppressing thickening.

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

  The body 12 has a front wall 12a and a back wall 12b that face each other in the thickness direction with the central axis C interposed therebetween. At the boundary between the front wall 12a and the back wall 12b, there is provided a vertical fold line portion 12c that functions as a fold-like fold when the body portion 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 approach. In addition, in this example, the shoulder part 11 is also provided with the vertical fold line part 11a so as to be connected to the vertical fold line part 12c, and the vertical fold line part 11a functions as a fold-like fold. Further, the vertical folding line portion 11 a is connected to the ends of the convex ribs 16 and 17. Thereby, the trunk | drum 12 and the shoulder part 11 can be crushed more easily in the thickness direction. In addition, in this example, when the shoulder part 11 and the trunk | drum 12 are crushed in the thickness direction, the vertical fold line part 12c and the vertical fold line part 11a are displaced to the width direction outer side as a mountain fold-shaped crease. The container 1 may be folded so that the vertical fold line portion 12c and the vertical fold line portion 11a are folded inward in the width direction. In addition, in this example, although the vertical fold line part 12c and the vertical fold line part 11a are comprised by the convex rib shape, a concave groove shape may be sufficient.

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

  In this example, the horizontal folding line part 14 is provided in the lower half part (half part by the side of the bottom part 13) of the trunk | drum 12, and is provided in the front wall 12a and the back wall 12b with the same shape, respectively. . In this way, the pair of lateral fold line portions 14 arranged to face each other in the thickness direction of the body portion 12 are connected to each other at the boundary portion (vertical fold line portion 12c) between the front wall 12a and the back wall 12b. In addition, the horizontal folding line part 14 is not an essential structure. Moreover, the horizontal folding line part 14 may be provided in the upper half part of the trunk | drum 12, and the multiple horizontal folding line part 14 may be provided in the height direction of the container 1 at intervals. Moreover, the horizontal folding line part 14 is good also as a structure extended only to a part of the circumferential direction of the trunk | drum 12. As shown in FIG. Moreover, you may provide the horizontal folding line part 14 only in any one of the front wall 12a and the back wall 12b. In the side view shown in FIG. 3, the horizontal folding line portion 14 forms a concave bent portion in the thickness direction of the body portion 12.

  The bottom portion 13 closes the lower end portion of the cylindrical body portion 12 and forms a flat ground surface (bottom surface) that can be grounded in the upright posture shown in FIGS. As shown in FIG. 5, a concave portion 13 a that is concave toward the inside of the container 1 is formed in the central portion of the bottom portion 13. In this example, the recessed part 13a is a substantially hemispherical curved surface. The bottom 13 is formed with a pair of grooves 13b extending in the width direction (major axis direction) at the center position in the thickness direction. The groove portion 13 b extends from the bottom portion 13 to the lower portion of the trunk portion 12. The groove 13b 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 13b are folded inside the container 1. In that case, the fold line part 15 provided in the boundary part of the trunk | drum 12 and the bottom part 13 functions as a mountain fold-shaped crease | fold. In addition, in this example, the broken line part 15 is provided in the front side and the back side of the container 1, respectively. In addition, the recessed part 13a, the groove part 13b, the broken line part 15 grade | etc., Are not essential structures, 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. Specifically, for example, the body of a bottomed tubular (test tubular) preform heated to a predetermined temperature that exhibits stretchability using a heater or the like is placed in the cavity of the mold, and the preform By supplying a gas or a liquid at a predetermined pressure through a nozzle, the preform can be formed into a container having a predetermined shape along the inner surface of the cavity of the mold. The preform can be obtained, for example, by performing injection molding, direct blow molding, extrusion molding or the like using a thermoplastic resin such as polypropylene (PP) or polyethylene terephthalate (PET) as a raw material. In addition, the preform includes a barrel portion having a bottomed cylindrical shape and a mouth portion connected to the trunk portion, the mouth portion is formed in a cylindrical shape, and a male screw portion is integrally provided on the outer peripheral surface thereof. The trunk is formed in a test tube having a circular cross section extending along the axial direction, and is provided coaxially and integrally with the mouth below the mouth.

  As described above, the container 1 according to the present embodiment has the pair of convex ribs 16 and 17 facing each other on the front side and the back side with the central axis C sandwiched between the shoulders 11. As shown in FIG. 6, when the shoulder portion 11 is crushed so as to be sandwiched from the front side and the back side, the pair of convex ribs 16 and 17 serve as a base point for bending, and the shoulder portion 11 can be easily folded. Further, by connecting the both end portions of the pair of convex ribs 16 and 17 at the intermediate position of the shoulder portion 11, the shoulder portion 11 can be easily folded to the intermediate 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 also in the case of a container used for a highly viscous content, it remains at an intermediate position of the shoulder portion 11. Since the contents can be squeezed out, the remaining amount of contents can be reduced. The container 1 of the present embodiment is suitable for a refill container that is used by refilling the contents into a container or the like dedicated to discharging contents.

  In addition, in the container 1 of this embodiment, folding of the shoulder portion 11 can be further facilitated by providing the vertical folding line portion 11a below the connecting portion 18 of the pair of convex ribs 16 and 17. it can.

  Moreover, in the container 1 of this embodiment, the trunk | drum 12 and the shoulder part 11 are easily crushed in the thickness direction by making the trunk | drum 12 into the flat shape whose width | variety is larger than thickness. As a result, the entire container 1 including the shoulder 11 can be folded more easily. For the same reason, it is preferable that the shoulder portion 11 has a flat shape like the trunk portion 12 as in the present embodiment.

  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 portion of the mouth portion 10, the vicinity of the proximal end portion of the mouth portion 10 is reached. The shoulder 11 can be bent. Therefore, the volume reduction effect by folding the shoulder part 11 and the residual amount reduction effect of the contents can be further improved.

  Hereinafter, another embodiment of the present invention will be described with reference to FIGS. Note that portions having the same basic functions as those of the above-described embodiment are denoted by the same reference numerals in the drawing and description thereof is omitted.

  7-12, the triangular flat surface 21 is provided in a pair of connection part 18 which the both ends of one convex rib 16 and the both ends of the other convex rib 17 connect, respectively. Yes. The triangular flat surface 21 has two sides 21b and 21b that coincide with the convex ribs 16 and 17, and an upper piece 21a that connects both ends of the pair of sides 21b and 21b. The container 2 is provided with longitudinal convex ribs 22 extending from the shoulder portion 11 to the trunk portion 12. Each vertical convex rib 22 is formed so as to protrude outward from the outer surface of the shoulder portion 11 or the trunk portion 12, and a concave portion corresponding to the vertical convex rib 22 is formed on the inner surface of the shoulder portion 11 or the trunk portion 12. ing. The vertical convex rib 22 can function as a fold having a mountain fold shape or a valley fold shape when the container 2 is folded by crushing the shoulder portion 11 and the trunk portion 12. Two longitudinally protruding ribs 22 are arranged opposite to each other on the front side and the back side. The upper ends of the four vertical convex ribs 22 are connected to the upper side 21a of the triangular flat surface 21, respectively. 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, the container 2 of the present embodiment has the shoulder portion 11 and the trunk portion 12 in the thickness direction (front side) while the vertical fold line portion 12c and the vertical fold line portion 11a are folded inside the container 2. The container 2 can be folded by being crushed so as to be sandwiched from the back side. In this case, the vertical fold line portion 12c and the vertical fold line portion 11a function as valley folds, and the four vertical convex ribs 22 function as mountain folds. Further, the upper side 21a of the triangular flat surface 21 functions as a mountain fold fold, and the two sides 21b other than the upper side 21a function as a valley 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 the width. In this example, the surface of the flat surface 21 is located on the same plane as the convex ribs 16 and 17 (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. Further, instead of the triangular flat surface 21, only convex ribs corresponding to the upper side 21 a may be provided.

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

  In addition, the container 2 of this embodiment can also fold by crushing the shoulder part 11 and the trunk | drum 12 similarly to previous embodiment. That is, the container 2 can be folded so that the vertical fold line portion 12 c of the trunk portion 12 and the vertical fold line portion 11 a of the shoulder portion 11 are displaced outward in the width direction of the container 2.

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

  The above description shows only one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, instead of the male screw 10a of the mouth portion 10, a protrusion for undercut engagement with a cap or the like may be provided. In this case, for example, the cap or the like can be attached to the mouth portion 10 by a stopper. Further, in the container 1 of the present example, the shoulder part 11, the body part 12 and the bottom part 13 are symmetrical in the thickness direction (front and rear symmetry) and symmetrical in the width direction (right and left symmetrical). However, the present invention is not limited to this, and any or all of the shoulder portion 11, the trunk portion 12 and the bottom portion 13 may be asymmetrical in the front-rear direction or asymmetrical in the left-right direction. Further, the bottom portion 13 may be configured not to constitute a grounding surface capable of grounding the container 1 in an upright state, and may be composed of, for example, a hemispherical curved surface that bulges downward.

DESCRIPTION OF SYMBOLS 1, 2: Synthetic resin containers 10: Mouth part 10a: Male screw 10b: Neck ring 10c: Tip opening 11: Shoulder part 11a: Vertical folding line part 12: Trunk part 12a: Front wall 12b: Back wall 12c: Vertical folding line part 13 : Bottom part 14: Horizontal folding line part 15: Folding line part 16, 17: Convex rib 16a, 17a: Central part 18: Connection part 21: Flat surface 21a: Top side 22: Vertical convex rib C: Center axis

Claims (4)

A synthetic resin container comprising a mouth, a shoulder, a trunk, and a bottom, and forming a storage space for contents,
The shoulder portion is disposed opposite to the front side and the back side across the central axis of the container, and is provided with a pair of convex ribs that 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 side in a front view or a rear view,
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 trunk portion has a flat shape having a width larger than a thickness.   The synthetic resin container according to claim 1 or 2, wherein a central portion of each convex rib is adjacent to a base end portion of the mouth portion.   The triangular flat surface is provided in any one of Claims 1-3 by which a pair of connection part which the both ends of said one convex rib and the both ends of said other convex rib each connect is provided. The synthetic resin container described.

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