JP4596416B2 - Synthetic resin creased container - Google Patents

Description

  The present invention relates to a container with a crease line made of synthetic resin, and particularly to a container suitable for volume reduction at the time of disposal.

In recent years, creased containers that can be easily crushed have been proposed in order to reduce the volume during disposal. As this type of container, as shown in FIG. 8, the body of the container body that stands up the mouth and neck is formed into a rectangular shape, the left and right side walls of the body are formed with longitudinal grooves 101 along the middle of the longitudinal center line, A structure in which a slanting groove 102 protruding from the vicinity of the upper end of the groove to the front and rear and from the lower end to the front and rear is recessed as a crease line (Patent Document 1), and in the structure, a rectangular body The thing which replaced the part with the cylindrical trunk | drum (patent document 2) is known.
JP 2003-276718 A JP 2003-237757 A

    The synthetic resin containers of Patent Document 1 and Patent Document 2 described above are obtained by horizontally arranging longitudinal grooves 101 and skew grooves 102 as crease lines in the body of the container body, and as shown in FIG. Since it is necessary to attach ribs 51, 51 corresponding to the crease line to the crease line corresponding place on the inner surface of the mold, there is a risk that the ribs rub against the surface of the molded product when opening the mold. is there. Such inconvenience does not become a problem when the depth of the grooved crease line is 0.1 mm or less, but if the crease line depth is not sufficient, the stress at the time of container crushing is induced to the crease line. Becomes difficult, and the function as a crease line decreases.

  In addition, as described above, the inwardly protruding vertical grooves and skew grooves have a high rigidity against outward projecting deformation, and therefore it is difficult to accurately convey the squeezing force to the container body to each groove that is a fold. It was.

  In the present invention, in order to enable easy crushing while avoiding scratches on the molded product, the side wall portion between the upper and lower oblique folding line portions is formed as an overhanging wall portion through the outward projecting short wall, and the overhanging wall An oblique crease line part is formed at the ridge line part of the part, and a vertical crease line part is formed as an outwardly projecting hollow rib.

The first means is to erect the neck 8 from the upper end of the body 4 having a quadrangular cross section and a quadrilateral front / rear left / right side wall shape through the shoulder 6 and vertically fold the left and right side walls. In a container with a crease line made of synthetic resin with inclined crease lines from the vicinity of both upper and lower ends of the crease to the four corners, each crease line being the first crease line 16, a triangular shape between the upper and lower oblique crease lines As the overhanging wall portions 22 and 22 that project the side wall portion outward, the ridge line of the overhanging wall portion is the slanted portion 16b of the first fold line 16, and the vertical fold line has a convex cross section that projects outward. Each of the curved surfaces is formed as a vertical line portion 16a, and the outer wall surfaces 22 and 22 of the left and right side walls and the outer wall surfaces of the side wall portion 24 excluding the protruding wall portion are formed into a substantially vertical wall surface or a curved surface projecting outward. Is a curve that curves inward in the left-right direction as the distance from the container center plane O including the vertical line portions 16a, 16a increases. It is. The vertical line portion can be, for example, a C-shaped or mountain-shaped hollow rib projecting outward.

  When this container is molded with a mold, it is preferable to form the container so that the vertical line portion 16a of the first fold line 16 is positioned on the dividing surface 52 of the mold as shown in FIG. 7A described later.

  The vertical wall surface is perpendicular to the dividing surface 52 of the mold, and the curved surface is curved inward in the left-right direction as it moves away from the dividing surface 52 in the front-rear direction. good.

Second means, possess the first hand stage, and the peripheral wall outer surface of the container body 2, at substantially the same height as the upper and lower ends of the vertical line portion 16a of the first folding lines 16, the second The fold line 20 is set sideways.

  When this second fold line is provided, it is only necessary to provide each small gap so that the second fold line 20 passes through. Further, the second fold line is formed in a concave groove that is recessed inward, and the container left and right side walls 12 and 12 provided with the first fold line 16 protruding outward are filled with the internal pressure during normal liquid filling. You may provide so that it may bulge outward.

According to the 1st means, there exist the following effects.
○ Since the vertical section 16a of the first crease line 16 has a convex cross section that projects outward, and the oblique section 16b is formed by the ridges of the projecting walls 22 and 22, the pair of left and right By aligning the dividing surface of the mold with the vertical line portion 16a, the molded product can be taken out without being damaged when the mold is opened.
○ Since the vertical line portion 16a has a convex shape that protrudes outward, the container left and right side walls 12, 12 are refracted into two folds by using the vertical line portion as a fold compared to the inwardly extending rib. It is not necessary to deform the refracted portion excessively, and therefore the repulsive force against the deformation at the time of crushing becomes small, so that it can be bent easily. Further, since the outer surfaces of the overhanging wall portions 22 and 22 and the side wall portion 24 excluding the overhanging wall portion are substantially vertical surfaces or curved surfaces protruding outward, the side wall portion 24 may be damaged when the mold is opened. Can be prevented.

  According to the second means, since the outer surfaces of the overhanging wall portions 22 and 22 and the side wall portion 24 excluding the overhanging wall portion are substantially vertical surfaces or curved surfaces protruding outwardly, the side wall portion 24 is made of gold. It can also prevent damage when the mold is opened.

According to the second means, since the second fold line 20 is provided on the outer peripheral wall of the container body 2 at the same height as the upper and lower ends of the vertical line portion 16a of the first fold line 16, Using the second fold line, it is possible to easily fold the bottom and shoulders or mouth and neck of the container body inward.

  Hereinafter, a container with a fold line made of synthetic resin according to the present invention will be described with reference to the drawings.

  First, a known part of the configuration of the container will be described. The container includes a container body 2 and a cap 40 fitted to the mouth and neck portion.

  The container body 2 has a mouth-and-neck portion 8 standing up through a shoulder portion 6 from a thin body portion 4 having a wide left and right and a vertically long rectangular shape. The left and right side walls 12 of the body 4 are formed with first fold lines 16 for side wall folding. The first crease line includes a vertical line portion 16a provided vertically in the middle in the vertical direction of the vertical center line C of each of the left and right side walls, and a hatched portion 16b extending in a reverse C shape from the vicinity of the upper end portion of the vertical line portion to the front and rear. And a slanted line portion 16b extending in a C shape from the vicinity of the lower end portion of the vertical line portion to the front and rear and the front end portion of each slanted line portion 16b, 16b faces the corner 14 of each side wall. In the illustrated example, small gaps 18 are provided between the upper and lower end portions of the vertical line portion 16a and the corresponding end portions of the oblique line portions 16b.

  A second fold line 20 that passes through a small gap 18 between the vertical line portion 16a and the oblique line portion 16b is provided around the outer surface of the body portion 4. The second fold line is formed as a concave groove that sinks into the container. Unlike the illustrated example, the second crease line is not necessarily provided on the entire circumference of the container body 4, and may be provided only in the vicinity of the corner of the rectangular body.

  The second fold line 20 is provided only at the corner of the body part 4, or the second fold line is omitted, and the first fold line 16a and the hatched part 16b are continuously formed. Also good.

  In addition, the said container body can be shape | molded with polyethylene or a polypropylene.

  In the present invention, the vertical line portion 16a of the first fold line 16 is formed as a hollow rib projecting outward as shown in FIG. 3, and the inverted triangular side wall portion between the above pair of oblique line portions 16b, 16b. Further, a triangular side wall portion between the pair of lower hatched portions 16b and 16b is formed on the outwardly projecting wall portion 22, and the ridge line of the projecting wall portion 22 is the hatched portion 16b of the first fold line. Each of the overhanging wall portions 22 protrudes outward from the side wall portion 24 excluding the overhanging wall portion via an outwardly projecting short wall 26, and the lower surface of the upper outwardly projecting short wall 26 is inclined in the front-rear and downward direction. The upper surface of the stepped portion and the lower outward projecting short wall 26 form an inclined stepped portion that is directed forward and backward.

  In addition, the outer surface of both the overhanging wall portions 22 and 22 and the outer surface of the side wall portion 24 excluding the overhanging wall portion are in FIG. 4 and FIG. 5 with respect to the container body center plane O including the vertical line portions 16a and 16a. However, more strictly, it is a curved surface that curves inward in the left-right direction as it moves away from the center plane O as shown in FIG. The overhang distance of the vertical line portion 16a and the overhang wall portion 22 from the side wall portion 24 excluding the overhang wall portion should be large enough to ensure the function of the crease line, for example, about 0.5 mm. . It should be noted that the protruding distance of the vertical line portion 16a from the side wall portion 24 excluding the protruding wall portion is preferably equal to the protruding distance of the protruding wall portion 22.

  In the above configuration, when the front and rear edges of the left and right side walls 12 and 12 of the container body 2 are pushed inward as indicated by arrows as shown in FIG. 5 (A), these edges first intersect with the second fold line. As shown in FIG. 5B, the vertical line portion 16a of the first fold line is refracted outward, and the oblique line portions 16b are also protruded outward as a result of the deformation. Since it is refracted, it becomes a flat shape in which the middle part of the body part is crushed back and forth. Next, when the container upper part and the bottom part 10 are folded back in the direction of the arrow, a completely crushed state is obtained as shown in FIG.

  In the hollow rib-like vertical line portion 16a projecting outward during the crushing operation, the side wall 12 portion in the vicinity of the vertical line portion is formed of the vertical line portion as shown by an imaginary line in FIG. The state before crushing in the direction of 90 ° with respect to the both side portions 17 is changed to the state after crushing in the direction of 180 ° as shown by the solid line in FIG. When this is compared with the longitudinal groove 101 as the crease line of the conventional container shown in FIG. It will be deformed to a state oriented in the direction of 0 °, and a large stress acts on the fold portion due to the acute refraction deformation. On the other hand, in the outward convex vertical line portion 16a of the present application, since the deformation is from a right angle to an obtuse angle (flat angle), the stress does not become excessive and is easily deformed. Further, in the hatched portion 16b of the first fold line, as shown in FIG. 6 (B), the side wall portion 25 in the vicinity of the hatched portion has a ridge line portion (more precisely, a ridge line and a valley line) as the hatched portion 16b. The main refraction point is deformed from 180 ° to almost 0 ° with respect to the overhanging wall portion 22, and the magnitude of the refraction angle is close to that of the longitudinal groove of the conventional container. However, since each hatched portion 16b is refracted and deformed in a manner induced by outward refraction of the preceding vertical line portion 16a as described above, the side wall portions 12 and 12 can be bent easily and reliably.

  Next, a procedure for molding the synthetic resin container of the present application will be described based on FIGS. 7 (A) and (B). This figure shows the state where both halves 50a and 50b of the mold 50 are closed by an imaginary line, and the state where both halves are opened by a solid line. The mold is formed so that the longitudinal center plane O of the container body 2 in FIG. 4 and the divided surfaces 52 of the mold halves 50a and 50b coincide. At this time, the vertical line portion 16a of the first fold line 16 is on the dividing surface 52 of the molds 50a and 50b, and the oblique line portions 16b and 16b are located on both the front and rear sides of the dividing surface, so 10 and the side wall portion 24 excluding the overhanging wall portion are formed in curved surfaces that curve inward in the left-right direction as the distance from the container center plane O increases. In this way, the inner surface of the mold is not rubbed and scratched on the formed product. In addition, the second fold line 20 is a groove projecting into the container body. However, since the second fold line 20 is provided horizontally in the container body, when the mold halves 50a and 50b are opened in the front-rear direction as shown in FIG. There is no rubbing against the inner surface of the mold. As a result, it is possible to produce a good molded product without scratches.

It is a front view of the synthetic resin crease line-equipped container according to the present invention. 1 is a side view of the container. FIG. 3 is a longitudinal sectional view of the container as seen in the direction of the line III-III in FIG. 2. FIG. 4 is a transverse cross-sectional view of the container viewed in the direction of the line IV-IV in FIG. 2. 1 is an explanatory view of the crushing process of the container, FIGS. (A) to (C) show the state before crushing, during crushing, and after crushing, respectively. 1 is an enlarged view of a main part after the container is crushed, in which FIG. 1 (A) is an enlarged sectional view of a vertical line portion of the first fold line, and FIG. 1 (B) is an enlarged sectional view of a hatched portion. FIG. 1 is an explanatory view of the container at the time of mold release, in which FIG. (A) shows the relationship between the vertical line part and the mold, and FIG. Yes. It is a perspective view of a conventional container. It is a principal part enlarged view after crushing of the conventional container of FIG. FIG. 9 is an explanatory diagram of a molding state of the conventional container in FIG. 8.

Explanation of symbols

2 ... container body 4 ... trunk 6 ... shoulder 8 ... mouth neck 10 ... bottom 12 ... trunk left and right side walls
14 ... Right side wall corner 16 ... First fold line 16a ... Vertical line part 16b ... Slant line part
17 ... Both sides of vertical line 18 ... Small gap 20 ... Second fold line 22 ... Overhang wall
24 ... Side wall part 25 ... Side wall part near hatched part 26 ... Stepped part
40 ... Cap 50 ... Mold 50a, 50b ... Mould half 51 ... Rib 52 ... Dividing surface
101 ... Vertical groove 102 ... Slanting groove

Claims (2)

The neck and neck (8) is erected from the upper end of the body (4) having a quadrangular cross section and the front and rear, left and right side walls have a quadrilateral shape through the shoulder (6) , and the left and right side walls are vertically folded. Looking for an inclined fold line provided from the upper and lower ends near the four corner portion, in which folding lines with container made each folding lines synthetic resin as the first folding lines (16), between the upper and lower both inclined fold line As the overhanging wall portions (22) and (22) with the triangular side wall portion protruding outward, the ridge line of the overhanging wall portion is the hatched portion (16b) of the first fold line (16) , and the vertical fold line is A vertical line portion (16a) having a convex cross section that protrudes outward, and the outer surfaces of the protruding wall portions (22), (22) of the left and right side walls and the side wall portion (24) excluding the protruding wall portion, formed on the curved surface overhangs the substantially vertical wall surface to the outer, the curved surfaces, each vertical line portion (16a), (16a Synthetic resin folding lines with a container, which is a curved surface which is curved in the lateral inward direction according the distance from the container body center plane (O) leaves containing. That the second fold line (20) is provided horizontally on the outer peripheral surface of the container body (2) at the same height as the upper and lower ends of the vertical line portion (16a) of the first fold line (16). The container with a fold line made of synthetic resin according to claim 1, wherein