JP5587124B2 - Plastic container - Google Patents

Description

  The present invention relates to a synthetic resin container having excellent resistance to load and high shape retention.

  In a line (hereinafter referred to as “filling line”) for filling the contents of synthetic resin bottles (hereinafter referred to as “bottles”), the bottles are conveyed in close contact with each other. Because the load is applied to the bottom side of the bottle body in the direction of the side of the bottle due to contact with the guide part arranged on the bottle, so-called line pressure is applied. It is known to cause bending deformation. For this reason, the applicant has proposed what improves the rigidity of a bottle radial direction by forming a step part between a trunk | drum and a bottom part (for example, refer patent document 1).

  The applicant has also proposed in the same document that a reduced pressure absorption panel is provided on the bottom side of the barrel side wall to absorb changes in the internal pressure of the bottle and effectively prevent deformation of the bottle.

  Furthermore, it is also known that, by providing a reinforcing rib that horizontally crosses the panel along the circumferential direction of the body, the bulge in the vacuum absorbing panel that occurs during filling can be suppressed. Patent Document 2). For this reason, the bottle described in Patent Document 1 is also provided with reinforcing ridges (lateral ribs) extending horizontally along the circumferential direction of the trunk so as to cross the vacuum absorbing panel (patent) Reference 1, FIG. 1, 3).

JP 2008-30817 A JP 2003-104344 A

  However, when the inventor of the present application is provided with a lateral rib extending horizontally along the circumferential direction of the trunk part on the decompression absorption panel provided on the bottom side of the trunk side wall, the lateral pressure generated by the filling line causes the lateral pressure to occur. It came to recognize that the bending (buckling deformation) with the rib as a base point occurs.

  An object of the present invention is to provide a novel synthetic resin container excellent in aesthetics by improving the shape retention of a vacuum absorbing panel.

The present invention is a synthetic resin container in which the bottom is integrally connected to the lower end of the trunk connected from the mouth through the shoulder,
Protruding strips are provided on the bottom wall of the vacuum absorbing panel, which is provided on the bottom side of the trunk side wall and is recessed toward the inner side of the trunk, and the convex strips have at least one bent portion directed toward the trunk. And the end edges of the bent portions are each integrally connected to the inner edge of the reduced pressure absorption panel with an interval in the circumferential direction of the body portion. In the present invention, the body portion can be formed into a polygonal column shape by a plurality of body portion side walls.

  In the present invention, the ridge may be an arcuate ridge having one bent portion. Further, the ridges can be wavy ridges having a plurality of bent portions.

  According to the present invention, the bottom wall of the vacuum absorption panel formed by denting the bottom side of the trunk side wall to the inside of the trunk is provided with a ridge that crosses the vacuum absorption panel in the circumferential direction of the trunk. Swelling in the vacuum absorbing panel that occurs sometimes can be suppressed.

  Further, according to the present invention, the ridge has at least one bent portion directed toward the mouth portion, and the edge of the bent portion is spaced from each other in the circumferential direction of the trunk portion. Even if the bottle is crushed and deformed based on the ridges crossing the vacuum absorbing panel due to the load applied to the body side wall, the bottle is crushed and deformed. The restoring force (spring effect) against is exerted. For this reason, it is possible to prevent buckling deformation that occurs in the bottle body due to bending with the ridge as a base point.

  Therefore, according to this invention, the novel synthetic resin container excellent in aesthetics can be provided by improving the shape retention property of a reduced pressure absorption panel.

It is a front view which shows the PET (polyethylene terephthalate) bottle 1 which is one form of the synthetic resin containers of this invention. It is a side view which shows the PET bottle 1 of the same form. (a) is the principal part front view which expands and shows the decompression absorption panel which concerns on the PET bottle 1 of the same form, (b) is an important figure which expands and shows the other form of the decompression absorption panel according to this invention. FIG.

  Hereinafter, a square PET bottle which is an embodiment of the present invention will be described in detail with reference to the drawings.

  The PET bottle 1 has a mouth portion 2 for filling and discharging the contents, a shoulder portion 3 that expands from the mouth portion 2, and a body portion 4 and a bottom portion 5 that form a filling space for the contents together with the shoulder portion 3. Prepare. The PET bottle 1 is formed by biaxial stretching blow molding of a preform (not shown).

  The body 4 includes two body side walls (hereinafter referred to as “longitudinal width side walls”) 4a having a wide width and two body side walls (hereinafter referred to as “short side walls”) 4b which are narrower than the longitudinal width side walls 4a. Are opposed to each other so as to surround the trunk axis (bottle axis O), and between the long side wall 4a and the short side wall 4b around the trunk axis, the long side wall 4a and the short side wall 4b. By connecting them integrally with a columnar body side wall (hereinafter referred to as “corner side wall”) 4c having a narrower width, it is formed into a substantially rectangular octagonal column shape with four corners cut out.

  Moreover, the trunk | drum 4 is divided into the upper trunk | drum and the lower trunk | drum through the waist part 4w. Further, between the lower end of the lower body portion and the bottom portion 5, an annular step portion 6 is provided over the entire circumference along the bottle axis O. For this reason, the bottom portion 5 extends from the lower end of the annular step portion 6 while reducing the diameter along the bottle axis O, and an annular grounding surface 5a is formed at the lower end.

Further, the body portion 4 is provided with a reduced pressure absorption panel 7 on the bottom portion 5 side on each of the long side wall 4a and the short side wall 4b. As shown in FIG. 3A, the reduced pressure absorption panel 7 is a concave panel that is recessed toward the inside of the trunk (on the bottle axis O side). The recessed side wall 7a that forms the recess of the vacuum absorbing panel 7 is a step portion with the long side wall 4a and the short side wall 4b, and is a region that extends horizontally along the circumferential direction of the trunk (around the bottle axis O) and 7a _1, with extend towards the bottom 5 side while bending the ends of the area portion 7a _1, is shaped in the region portions 7a ₂ which is connected so as to curve in the bottom 5 side.

  Further, the decompression absorbing panel 7 is provided with a ridge 8 which crosses the decompression absorbing panel 7 in the circumferential direction of the trunk portion and bulges outward of the trunk portion on the bottom wall 7c surrounded by the concave side wall 7a. . As shown in FIG. 3A, the ridges 8 bulge integrally from the bottom wall 7c toward the outside of the bottle at a height not exceeding the surfaces of the long side wall 4a and the short side wall 4b. Thereby, the reduced pressure absorption panel 7 can maintain the reduced pressure absorption function which is the original function.

  Further, the ridge 8 has one bent portion 8a that is directed toward the mouth portion 2 along the bottle axis O, and the edge 8b of the bent portion 8a is spaced apart in the circumferential direction of the trunk portion. Then, by being integrally connected to the concave side wall 7a, an arcuate ("parabolic" in the present embodiment) is formed. As a result, even if a compressive force or an extending force along the bottle axis O is generated with respect to the vacuum absorbing panel 7, when the force is released, the ridge 8 functions like a spring, thereby restoring force (spring Effect).

  As described above, according to the present embodiment, the reduced-pressure absorption panel 7 is attached to the bottom wall 7c of the reduced-pressure absorption panel 7 in which the bottom 5 side of the long-width side wall 4a and the short-width side wall 4b is recessed to the inside of the body. Since the ridges 8 traversing in the circumferential direction are provided, it is possible to suppress bulges in the vacuum absorbing panel 7 that occur during filling.

  Moreover, according to this form, the protruding item | line 8 has one bending part 8a orient | assigned toward the opening part 2, and the edge 8b of the said bending part 8a is spaced apart in the trunk | drum circumferential direction, respectively. Even when the bottle 1 is crushed and deformed based on the ridges 8 crossing the vacuum absorbing panel 7 due to the load applied to the body side wall, the bottle 1 is connected to the recess side wall 7a. The restoring force (spring effect) against the crushing deformation is exhibited. For this reason, it is possible to prevent buckling deformation that occurs in the bottle body portion 4 due to bending with the ridges 8 as a base point.

  For example, when the bottle 1 is used in a filling line, line pressures (for example, guide portions disposed on both sides of the conveyor are respectively provided on the bottom 5 side of the long side wall 4a, the short side wall 4b, and the corner side wall 4c. A load caused by contact and a load caused when a plurality of bottles are brought into contact with each other at the time of conveying the conveyor are applied. For this reason, it is also conceivable that the bottle 1 is crushed and deformed based on the ridges 8 crossing the vacuum absorbing panel 7 by the line pressure applied to the bottom 5 side of the long side wall 4a and the short side wall 4b.

  In addition, in this embodiment, as shown by a symbol L in FIG. 1, the reduced pressure absorption panel 7 is provided at a position lower than a position where the body portion 4 contacts the guide portions disposed on both sides of the conveyor. In this case, if the bottle 1 is crushed and deformed based on the ridges 8, it is difficult to restore the bottle 1.

  On the other hand, as in this embodiment, the ridge 8 has one bent portion 8a directed toward the mouth portion 2, and the end edges 8b of the bent portion 8a are spaced from each other in the circumferential direction of the trunk portion. If the concave side wall 7a is integrally connected to the concave side wall 7a, the line 1 applied to the bottom 5 side of the long side wall 4a and the short side wall 4b causes the bottle 1 to be crushed and deformed based on the ridges 8 crossing the vacuum absorbing panel 7. Even in such a case, the restoring force (spring effect) against the crushing deformation of the bottle 1 is exhibited. For this reason, it is possible to prevent buckling deformation that occurs in the bottle body portion 4 due to bending with the ridges 8 as a base point.

  Therefore, according to this embodiment, a novel PET bottle excellent in aesthetics can be provided by improving the shape retention of the reduced pressure absorption panel 7.

  Further, the ridge 8 according to the present invention has at least one bent portion 8a directed toward the mouth portion 2, and the end edges 8b of the bent portion 8a are recessed with a space in the circumferential direction of the trunk portion. What is necessary is just to be integrally connected with the side wall 7a. For this reason, the protruding item | line 8 can also be made into the wave-like thing which has the two bending parts 8a, as shown in FIG.3 (b).

  Note that the number of the bent portions 8a is not limited to two as long as it is plural. Further, in order to exert a restoring force (spring effect), the bent portion 8a is preferably curved so that the ridges 8 have a parabolic shape as in the present embodiment, but the restoring force There is no limitation to this as long as it is a bent shape that exhibits the (spring effect).

  The above description shows only one embodiment of the present invention, and various modifications can be made according to the present invention. For example, between the trunk | drum 4 and the bottom part 5, it can be set as the thing of the structure connected directly, without providing the step part 6. FIG. Further, the configuration around the reduced pressure absorption panel 7 can be changed as appropriate. Furthermore, the trunk | drum 4 can also comprise the upper part and lower side of a trunk | drum with an integral side wall, without providing the waist part 4w. The polygonal column shape of the bottle 1 is not limited to a flat cross section composed of a long side wall and a short side wall as in the present embodiment, and is equivalent to a long side wall and a short side wall. It is also possible to make it into a regular polygonal columnar shape by making the width of the body portion side wall having a width of or a width of the body portion width side wall and the corner portion side wall to be equal. Further, the bottle 1 may have a cylindrical body.

  The present invention can be applied to various containers as long as it is a synthetic resin container in which the bottom part is integrally connected to the lower end of the body part connected from the mouth part via the shoulder part.

1 PET bottle (synthetic resin container)
2 Mouth 3 Shoulder 4 Body 4a Longitudinal width side wall (trunk width side wall)
4b Short width side wall (trunk width side wall)
4c Corner side wall (trunk side wall)
5 Bottom part 5a Grounding surface 6 Step part 7 Depressurization absorption panel 7a Recessed side wall 7c Bottom wall 8 Projection 8a Bending part

Claims (4)

A synthetic resin container in which the bottom part is integrally connected to the lower end of the trunk part connected from the mouth part through the shoulder part,
On the bottom wall of the vacuum absorption panel formed by denting the bottom side of the trunk side wall, a ridge that crosses the vacuum absorption panel in the trunk circumferential direction is provided.
The ridge has at least one bent portion directed toward the mouth portion, and the edge of the bent portion is spaced from each other in the circumferential direction of the trunk portion to form a depression side wall forming a depression of the vacuum absorbing panel. A synthetic resin container characterized by being integrally connected.   2. The synthetic resin container according to claim 1, wherein the ridge is an arcuate ridge having one bent portion.   2. The synthetic resin container according to claim 1, wherein the ridge is a wavy ridge having a plurality of bent portions.   The synthetic resin container according to any one of claims 1 to 3, wherein the body portion is formed into a polygonal column shape by a plurality of body portion side walls.

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