JP6584108B2 - Plastic container - Google Patents

Description

The present invention relates to a bottle-shaped synthetic resin container including a mouth portion serving as a spout for contents, a trunk portion connected to the mouth portion via a shoulder portion, and a bottom portion closing the lower end of the trunk portion. In particular, it is intended to increase the buckling strength while maintaining the lateral rigidity of the container.

  Synthetic resin containers such as polypropylene (PP) bottles and polyethylene terephthalate (PET) bottles are lightweight, easy to handle, excellent in storage stability, and cost-effective. Since it is inexpensive, it is frequently used as a container for filling foods, beverages, cosmetics, drugs, and the like.

  In recent years, with this type of container, the wall thickness of the container has been reduced (lightened) to reduce the amount of material used per bottle in order to reduce waste and maintain the natural environment well. There is an increasing demand, and in order to cope with the demand, the strength of the container is unavoidably reduced. For such a problem, for example, a technique has been proposed in which the side wall strength of the bottle-type container is increased by forming an annular groove around the body part in the body part of the container. (For example, refer to Patent Document 1).

JP 2003-104343 A

  In a container having such an annular groove, if the depth of the groove is increased in order to further increase the side strength of the container, the annular groove becomes a starting point for buckling deformation, and the buckling strength of the container is reduced. There was a possibility of causing it.

  The present invention has been made in view of such a problem, and the object thereof is a bottle-shaped synthetic resin container having an annular groove portion in a body portion, while maintaining the lateral strength of the container, and buckling strength. It is in the place of proposing the synthetic resin container which can raise.

A synthetic resin container according to the present invention includes a mouth portion serving as a spout for contents, a cylindrical trunk portion connected to the mouth portion via a shoulder portion, and a bottom portion for closing the lower end of the trunk portion. In a bottle-shaped synthetic resin container,
The trunk portion is provided along the circumferential direction of the trunk portion, and has an annular groove portion that is concave toward the radially inner side.
On the side wall that forms the annular groove, a first bulging portion having a substantially triangular shape that bulges toward the outside of the container, and a second bulging portion that is substantially upside down of the first bulging portion, Are alternately arranged adjacent to each other along the circumferential direction,
The first bulge portion includes three upper side intersections located at the apex portion of a substantially triangle and one lower side intersection located on the bottom side of the two upper intersections. It is divided by the outline of
Position of the lower intersection portion in the circumferential direction, Ri near between the two upper intersection portion,
Only one row of the first bulging portion and the second bulging portion, which are alternately and continuously arranged along the circumferential direction, is provided on a side wall constituting one annular groove portion. Features.

  In the synthetic resin container of the present invention, it is preferable that the barrel portion has a label that is tightly held on the outer peripheral surface of the barrel portion so as to cover at least the annular groove portion.

  According to the present invention, it is possible to provide a synthetic resin container that can increase buckling strength while maintaining the lateral strength of the container in a bottle-shaped synthetic resin container having an annular groove on the body. It becomes.

It is a side view of the synthetic resin container which is one Embodiment of this invention. (A) is AA sectional drawing of the synthetic resin container shown in FIG. 1, (b) is BB sectional drawing. It is a side view of the conventional synthetic resin container shown for comparison.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. Reference numeral 1 in the drawing represents an embodiment of a synthetic resin container (hereinafter simply referred to as “container”) according to the present invention. As shown in FIG. 1, a bottle-shaped container 1 has a cylindrical mouth part 2 that serves as a spout for contents, and a cylindrical part that extends from a lower end part of the mouth part 2 through a shoulder part 3. The body part 4 and the bottom part 5 which obstruct | occludes the lower end of the said body part 4 are provided, and the inner side of the container 1 becomes the internal space which accommodates the content. In addition, as the container 1 according to the present invention, for example, a bottle formed by biaxial stretch blow molding using a preform made of polyethylene terephthalate (PET) as a raw material can be used. However, the present invention is not limited to this. For example, it can be formed by extrusion blow molding.

  A male screw is provided on the outer peripheral surface of the mouth portion 2, and a cap (not shown) having a female screw corresponding to the male screw can be detachably screwed. The configuration of the cap mounted on the mouth portion 2 is not particularly limited, and a configuration in which the cap portion 2 is undercut engaged with the mouth portion 2 is also possible. Moreover, it is also possible to employ | adopt the cap provided with the base part engaged and hold | maintained with respect to the opening part 2, and the cover part which can be opened and closed with respect to a base through a hinge.

  The shoulder portion 3 is formed in a dome shape that expands while curving outward in the radial direction from an upper portion continuous with the mouth portion 2 toward a lower portion continuous with the trunk portion 4. The shoulder portion 3 is not limited to a curved dome shape, and may have a linearly expanding shape, and the shape is not particularly limited as long as the mouth portion 2 and the trunk portion 4 are connected.

  A plurality of decompression absorbing surfaces 6 and a plurality of column portions 7 that are recessed toward the inside of the container are alternately arranged in the circumferential direction in the body portion 4, and a transverse section (that is, orthogonal to the central axis C of the container 1). The cross section is formed to have a substantially polygonal shape with the plurality of column portions 7 as apexes. More specifically, in the present embodiment, it is formed in a cylindrical shape having a substantially regular hexagonal shape with the six column portions 7 as apexes in the cross section. The reduced-pressure absorbing surface 6 is preferentially deformed when the inside of the container is depressurized as the filled contents are cooled, and is configured to prevent unauthorized deformation of the bottle (such as local depression deformation). It is. In the present invention, the reduced pressure absorption surface 6 and the column part 7 are not essential components, and the shape of the body part 4 excluding the annular groove part 10 described later is not particularly limited.

  In the vicinity of the upper end portion of the body portion 4, an annular groove portion 10 that is concave inward in the radial direction is provided along the circumferential direction of the container 1. A substantially bulging first bulging portion 11 that bulges outward from the container 1 and a second bulging that is substantially upside down of the first bulging portion 11 are formed on the side walls of the annular groove portion 10. The portions 12 are adjacently arranged alternately and continuously along the extending direction of the annular groove portion 10 (the circumferential direction of the container 1). As shown in FIG. 1, the 1st bulging part 11 and the 2nd bulging part 12 are divided by the outline 13 which comprises three substantially triangular sides, The 1st bulging part 11 and the outline 13 It is made into the shape which bulges slightly toward the outer side of the container 1 in the annular groove part 10 toward the center area | regions 11a and 12a of each 2nd bulging part 12. FIG. In addition, as shown in FIG. 1, the apex portion of a substantially triangle, that is, the upper intersection portion 14 and the lower intersection portion 15 that are intersection points of the contour line 13 are alternately arranged along the circumferential direction, and the upper intersection portion 14 and A contour line 13 connecting the lower intersections 15 extends in a zigzag shape in the circumferential direction. In addition, the shape of the upper side intersection part 14 and the lower side intersection part 15 is not specifically limited, For example, it can be set as shapes, such as a point, a straight line, or a curve.

  Here, FIGS. 2A and 2B are views showing an AA cross section and a BB cross section perpendicular to the central axis C in the container 1 shown in FIG. As shown in FIG. 2A, in the AA cross section, the upper intersection portion 14 is a portion located on the innermost radial direction of the side wall constituting the annular groove portion 10, and is the center of the first bulging portion 11. It is located radially inward compared to the region 11a. In addition, as shown in FIG. 2B, in the BB cross section, the lower intersection 15 is a portion located on the innermost side in the radial direction of the side wall constituting the annular groove 10, and the second bulging portion Compared to the twelve central regions 12 a, they are located radially inward. Further, in the present embodiment, in the longitudinal sections passing through the upper intersection portion 14 and the lower intersection portion 15, the most radially inward portions of the side walls constituting the annular groove portion 10 are the upper intersection portion 14 and the lower intersection portion, respectively. It becomes the side intersection 15. Therefore, the most radially inward portion of the side wall constituting the annular groove portion 10 periodically changes up and down along the extending direction of the annular groove portion 10 (the circumferential direction of the container 1).

  FIG. 3 shows a synthetic resin container 100 having a conventional annular groove 110. The side wall of the annular groove 110 is not provided with irregularities such as the first bulging portion 11 and the second bulging portion 12 formed in the container 1 of FIG. Is formed only of a trapezoidal shape or a constant cross-sectional shape of a V shape or a U shape. In the case of such a container 100, by providing the annular groove 110, the strength against the radial force, that is, the side strength can be increased, but the annular groove 110 becomes a starting point of buckling deformation, and the buckling strength is weak. There is a risk of becoming. Specifically, when a force in the compression direction along the central axis C is applied to the container 100, the force is easily concentrated on the annular groove 110, and the upper and lower side walls constituting the annular groove 110 are deformed so as to be close to each other. In other words, the annular groove 110 may act like a bellows.

  On the other hand, in the container 1 of the present embodiment, the first bulging portion 11 and the second bulging portion 12 are provided on the side surface of the annular groove portion 10 so as to extend obliquely with respect to the central axis C. By the action of the contour line 13, the longitudinal force along the central axis C can be converted into a circumferential force inclined with respect to the central axis C direction and dispersed to suppress buckling deformation. Therefore, according to the container 1 of the present embodiment, it is possible to increase the buckling strength of the container 1 while maintaining the effect of improving the side surface strength due to the annular groove 10.

  In addition, although illustration is abbreviate | omitted, on the trunk | drum 4, it is preferable to provide the label closely_contact | adhered around the trunk | drum 4 so that the annular groove part 10 may be covered. Examples of the label include, but are not limited to, heat-shrinkable labels typified by shrink labels, stretchable so-called stretch labels, adhesive labels provided with an adhesive layer on the back surface, or Roll labels can also be used. When such a label is provided, when a large vertical force is applied to the container 1 and the container 1 is going to deform outward in the radial direction, the label 1 is clamped from the outside by tightening from the outside. It becomes possible to suppress the deformation to the direction. This makes it possible not only to enhance the decorativeness but also to further increase the strength of the container 1 by using labels that are frequently used mainly for the purpose of decoration.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

  For example, in the above-described embodiment, the annular groove portion 10 is provided only in the vicinity of the upper end portion of the trunk portion 4, but is not limited thereto, and can be provided in the central portion or the lower end portion of the trunk portion 4. You may provide in multiple places not only in one place. Furthermore, in addition to the annular groove portion 10, it is possible to additionally provide an annular groove portion 110 as shown in FIG.

DESCRIPTION OF SYMBOLS 1 Synthetic resin container 2 Mouth part 3 Shoulder part 4 Trunk part 5 Bottom part 6 Decompression absorption surface 7 Column part 10 Annular groove part 11 1st bulging part 12 2nd bulging part 13 Contour line 14 Upper intersection part 15 Lower intersection part C Center axis

Claims (2)

In a bottle-shaped synthetic resin container provided with a mouth part serving as a spout for contents, a cylindrical body part connected to the mouth part via a shoulder part, and a bottom part closing the lower end of the body part,
The trunk portion is provided along the circumferential direction of the trunk portion, and has an annular groove portion that is concave toward the radially inner side.
On the side wall that forms the annular groove, a first bulging portion having a substantially triangular shape that bulges toward the outside of the container, and a second bulging portion that is substantially upside down of the first bulging portion, Are alternately arranged adjacent to each other along the circumferential direction,
The first bulge portion includes three upper side intersections located at the apex portion of a substantially triangle and one lower side intersection located on the bottom side of the two upper intersections. It is divided by the outline of
Position of the lower intersection portion in the circumferential direction, Ri near between the two upper intersection portion,
A side wall constituting one annular groove is provided with only one row of the first and second bulging portions arranged alternately and continuously along the circumferential direction. Resin container. The synthetic resin container according to claim 1, wherein the barrel portion has a label that is tightly held on an outer peripheral surface of the barrel portion so as to cover at least the annular groove portion.

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