JP4296930B2 - container - Google Patents

Description

  The present invention relates to a container having a groove-shaped waist portion extending in the lateral direction at a longitudinal intermediate portion of a body portion, and more particularly, to a thin plastic bottle container that is lightweight and highly recoverable.

Plastic bottle containers such as PET bottles are easy to mold and suitable for mass production, and have excellent properties such as high mechanical strength and light weight, so they are filled with various liquids. Used as a container in a wide range of fields.
In particular, in recent years, it is used in large quantities as containers for beverages such as various beverages and mineral water.

  There are many types of bottle containers that meet market demands. For example, a container having a capacity of about 2 liters is used. About the shape of a bottle container, the thing of a rectangular or square shape is conventionally employ | adopted considering the refrigerator storing property and the ease of holding.

  Moreover, in the bottle container with a large capacity | capacitance, in order to provide intensity | strength required for a trunk | drum, the grooved waist part along a horizontal direction is formed in the vertical direction intermediate part of a trunk | drum. The waist portion not only functions as a reinforcing portion, but also functions as a gripping portion that hooks a finger when the bottle container is held with one hand, so that the ease of holding the bottle container can be improved.

By the way, in recent years, the thickness of a bottle container has become thin and the strength of the bottle container has been reduced as a whole due to the trend toward lighter containers with resource saving. In such a thin bottle container that has been reduced in weight, by forming a horizontal bead or a vertical bead on the body part, the necessary strength and restoring force can be imparted, and the bottle container can be prevented from being dented or deformed. (For example, refer to Patent Document 1).
JP 2003-104345 A

  However, in a bottle container that has been reduced in weight to a certain extent, even if a horizontal bead or a vertical bead is formed on the trunk, when a bottle container collides with each other during manufacture or transportation, or when the container is gripped by hand, It has been found that dents and deformations occur in the waist when the container is displayed at the store. In many cases, this dent or deformation occurs on the slope of the waist (including the arc surface). Even if the position of the horizontal bead or vertical bead formed on the trunk is changed, the dent or deformation will not occur. It could not be prevented.

  The present invention has been considered in view of the above circumstances, and in a thin-walled container that has been reduced in weight, in particular, provides necessary strength and restoring force to the waist portion and its vicinity, and dents and deformation of the waist portion. It aims at providing the container which can prevent.

In order to achieve the above object, the container of the present invention is a container having a groove-shaped waist portion extending in the lateral direction at the longitudinal intermediate portion of the body portion, the waist portion being located above the groove bottom surface and / or One or more vertical groove-shaped vertical beads along the vertical direction having a slope on the lower side are formed such that the outer peripheral edge is defined in a rectangular shape by a ridgeline and is recessed inward of the container, and at least the The upper slope and / or the lower slope is formed.

If it does in this way, the fall of the intensity | strength of a waist part and the restoring force accompanying the thinning of a container can be suppressed.
For example, even if a pressing force acts on the slope of the waist due to a collision between containers, and the dent or deformation occurs on the slope, the vertical bead becomes the starting point of the dent or deformation, and the pressing force is applied along with the elastic deformation. Since the energy is stored, the recessed portion and the deformed portion can be restored by the stored energy.
Thereby, even if it is a thin container by which weight reduction was achieved, the intensity | strength and restoring force which are required for a waist part can be ensured, and the dent and deformation | transformation of a waist part can be prevented.

  Moreover, since the vertical bead formed in the waist part gives appropriate resistance to the finger when the finger is gripped by the finger, the finger can be prevented from slipping and the ease of holding the container can be improved.

Moreover, the container of this invention is set as the structure by which the said several groove-shaped vertical bead concerning the said upper side slope and / or the said lower side slope is formed in parallel at predetermined intervals in the horizontal direction. .
If it does in this way, since the some vertical bead is distributedly formed in the slope of a waist part over a wide range, the prevention effect of the dent in a waist part and a deformation | transformation can be heightened.

The container of the present invention, the said groove-shaped longitudinal bead formed so as to take the upper inclined surface, the concave groove-shaped longitudinal bead formed as according to the lower slope, the groove bottom surface It is set as the structure formed continuously by the concave groove-shaped vertical bead formed in this.
As described above, when the vertical bead is formed so as to continue from the upper slope to the lower slope, the strength and restoring force of the entire waist portion including the groove bottom surface (vertical surface) can be increased.

Moreover, the container of this invention is the structure by which the said groove-shaped vertical bead is formed in the front waist part of the said trunk | drum, a back waist part, a left side waist part, a right side waist part, and / or a square waist part. It is as.
If it does in this way, it will become possible to prevent a dent and a deformation | transformation in the circumferential direction whole region of a waist part.

Moreover, the container of this invention is set as the structure by which the said groove-shaped vertical bead is formed in the waist part in two surfaces or two corners which the said trunk | drum opposes at least.
If it does in this way, the resilience with respect to the deformation | transformation and dent of the opposing surface or opposing corner | angular of a container which is easy to collide with the adjacent container at the time of container conveyance can be ensured reliably. In addition, indentation (grip part) for improving gripping property can be formed in two opposing surfaces or corners that do not form vertical beads.

Moreover, the container of this invention is set as the structure by which a horizontal bead is formed on the upper side and / or the lower side of the said waist part at predetermined intervals with the said groove-shaped vertical bead.
If it does in this way, since the strength fall of the waist part accompanying weight reduction is suppressed by a side bead, the prevention effect of the dent and a deformation | transformation in a waist part can further be heightened.
Further, since the horizontal beads are formed at a predetermined interval from the vertical beads, there is no inconvenience that the elastic restoring force of each bead is lowered as in the case where the vertical beads and the horizontal beads are continuous.

The container of the present invention is a rectangular container having a substantially rectangular or square cross section.
If it does in this way, in the square container excellent in refrigerator storing property and ease of holding, the present invention can be applied and a dent and a deformation of a waist part can be prevented.

The container of the present invention is a resin container formed of a thermoplastic resin such as polyethylene terephthalate.
If it does in this way, in a resin container excellent in moldability etc., the present invention can be applied and a dent and a deformation of a waist part can be prevented.

As described above, according to the present invention, the outer peripheral edge is defined in a rectangular shape by the ridge line and is formed on the inclined surface of the waist portion by the concave groove-shaped vertical beads formed so as to be recessed inward of the container. Since the strength and the restoring force are imparted, the dent and deformation of the waist portion can be prevented even in a thin container that is reduced in weight.

  Hereinafter, an embodiment applied to a plastic bottle container will be described as an example of the container of the present invention.

As the thermoplastic resin constituting the bottle container, any resin can be used as long as it can be stretch blow molded and thermally crystallized.
Specifically, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polylactic acid or thermoplastic polyesters such as copolymers thereof, blends of these resins or other resins are suitable. In particular, an ethylene terephthalate thermoplastic polyester such as polyethylene terephthalate is preferably used.
Further, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can also be used.
These resins are blended with various additives such as colorants, ultraviolet absorbers, mold release agents, lubricants, nucleating agents, antioxidants, antistatic agents and the like within a range that does not impair the quality of the molded product. be able to.

The ethylene terephthalate-based thermoplastic polyester constituting the bottle container occupies most of the ester repeating units, generally 70 mol% or more, and has an ethylene terephthalate unit, a glass transition point (Tg) of 50 to 90 ° C., a melting point (Tm ) Is in the range of 200 to 275 ° C.
As an ethylene terephthalate-based thermoplastic polyester, polyethylene terephthalate (PET) is particularly excellent in terms of pressure resistance, heat resistance, heat pressure resistance, etc. In addition to ethylene terephthalate units, dibasic acids such as isophthalic acid and naphthalenedicarboxylic acid Copolyesters containing a small amount of ester units composed of diols such as propylene glycol can also be used.

Moreover, the bottle container of this embodiment can also be comprised by the thermoplastic polyester layer of two or more layers besides the case where it is comprised by the single layer (one layer) thermoplastic polyester layer.
Furthermore, the bottle container of this embodiment can be provided with a medium layer enclosed between an inner layer and an outer layer composed of two or more thermoplastic polyester layers, and the intermediate layer can be a barrier layer or an oxygen absorbing layer. Can do.
By providing the barrier layer and the oxygen absorbing layer in this manner, it is possible to suppress the permeation of oxygen from the outside into the bottle container, and to prevent the deterioration of the contents in the bottle container due to the oxygen from the outside. It is suitable for a bottle container for beverages containing carbon dioxide gas.
Here, as the oxygen absorbing layer, any layer can be used as long as it absorbs oxygen and prevents permeation of oxygen, but a combination of an oxidizable organic component and a transition metal catalyst, or substantially It is preferred to use a combination of a gas barrier resin that does not oxidize, an oxidizable organic component and a transition metal catalyst.

[First embodiment]
Below, the bottle container which concerns on 1st embodiment of this invention is demonstrated with reference to FIGS. 1-4.
1 is a front view of a bottle container according to the first embodiment, FIG. 2 is a side view of the bottle container according to the first embodiment, and FIG. 3 is an XX cross-sectional view of the bottle container according to the first embodiment. FIG. 4 is a YY cross-sectional view of the bottle container according to the first embodiment.

  A bottle container 1 shown in these drawings is a plastic bottle container formed by biaxially stretching blow-molding a preform made of the above-described thermoplastic resin, and has a mouth portion 2, a shoulder portion 3, a trunk portion. 4 and bottom 5.

It is preferable that the trunk | drum 4 makes a cross-sectional shape substantially rectangular, and the short side is 110 mm or less. If it does in this way, even if it is a large container with a capacity | capacitance of 2000-3000 ml, while being able to ensure favorable refrigerator stowability, it becomes possible to hold | maintain the bottle container 1 with one hand.
The body 4 may have a substantially square cross-sectional shape. In this case, if the one side is set to 110 mm or less, good refrigerator storage property and handling property can be secured.

A concave groove-shaped waist portion 6 extending in the lateral direction is formed in the middle portion in the longitudinal direction of the body portion 4 over the entire circumference. The waist portion 6 is a portion having both a reinforcing portion function for imparting a necessary strength to the body portion 4 and a gripping portion function that facilitates handling when the bottle container 1 is held with one hand. A vertical surface 61 serving as a bottom surface, an upper inclined surface 62 formed above the vertical surface 61, and a lower inclined surface 63 formed below the vertical surface 61 are provided.
The upper slope 62 and the lower slope 63 of the present embodiment are arcuate surfaces having predetermined R dimensions (R20, R30), but the R dimension is not limited. Further, the inclined surface is not limited to the arc shape, and may be a linear shape or an inclined surface having a bent portion.

The upper side slope 62 and the lower side slope 63 of the waist part 6 have concave groove-like vertical beads along the longitudinal direction in order to suppress a reduction in strength and a reduction in restoring force of the waist part 6 due to the thinning of the bottle container 1. 64 is formed.
As shown in FIGS. 1 to 4 , the vertical bead 64 is formed such that the outer peripheral edge is defined in a rectangular shape by a ridge line and is recessed toward the inside of the container. The vertical bead 64 formed in this way has a trapezoidal cross section perpendicular to the longitudinal direction, and, as shown in FIGS. When the container 1 is viewed from the front, it has a bottom portion that is defined by a ridge line in a rectangular shape. At the four corners of the vertical bead 64, there are ridge lines that connect the corners of the outer peripheral edge and the bottom corners. Is formed.
By forming such a vertical bead 64, when a pressing force is applied to the upper inclined surface 62 and the lower inclined surface 63 due to the collision between the bottle containers 1, it becomes a starting point of dents and deformation, and the elastic deformation causes the pressing. Since the pressure is stored, even if a dent or deformation occurs on the upper slope 62 or the lower slope 63, the dent portion or the deformed portion can be restored by the stored energy.
Moreover, since the vertical bead 64 gives moderate resistance to the finger when the waist portion 6 is gripped by the finger, the finger can be prevented from slipping and the handling property of the bottle container 1 can be improved.

The vertical beads 64 may be formed only on the upper and lower inclined surfaces 62 and 63 of the groove bottom surface (vertical portion) 61, but are preferably formed on the inclined surfaces 62 and 63 on both sides as in this embodiment. In this way, it is possible to prevent dents and deformations on the upper slope 62 and the lower slope 63.
Further, the length and width of the vertical bead 64 can be arbitrarily set. For example, the length of the vertical bead 64 is preferably matched with the vertical width of the slopes 62 and 63, but the effect of the present invention can be achieved even if the vertical bead 64 is shorter or longer than the vertical width of the slopes 62 and 63. can get.

  Further, the vertical bead 64 can be formed on any of the front waist portion 6, the back waist portion 6, the left side waist portion 6, the right side waist portion 6, and the square waist portion 6 of the trunk portion 4. For example, if the vertical beads 64 are formed on the waist portion 6 of all surfaces as in the present embodiment, it is possible to prevent dents and deformations in the entire circumferential direction of the waist portion 6.

  There is no restriction | limiting in the number of the vertical beads 64 formed in the waist part 6 of each surface. For example, although the effect of the present invention can be obtained with one vertical bead 64, each of the inclined surfaces 62, the front waist part 6, the back waist part 6, the left side waist part 6 and the right side waist part 6 having a lateral width is provided. It is preferable to form a plurality of vertical beads 64 in 63, and in particular, three or more are preferable.

  Moreover, in the waist part 6 of each surface, when forming the some vertical bead 64 in each slope 62, 63, it is preferable to form in parallel at predetermined intervals in the horizontal direction. In this way, since a plurality of vertical beads 64 are distributed over a wide range on the slopes 62 and 63 of the waist portion 6, even three vertical beads 64 prevent dents and deformation in a wide range of the waist portion 6. It becomes possible to do.

Further, a lateral bead 41 can be formed on the upper side or the lower side of the waist part 6 so as to be parallel to the waist part 6. This horizontal bead 41 has an effect of suppressing a decrease in strength of the waist portion 6 due to weight reduction and preventing the dent and deformation of the waist portion 6.
Moreover, when forming the horizontal bead 41 on the upper side or the lower side of the waist part 6, it is preferable to form it at a predetermined interval from the vertical bead 64. In this way, it is possible to avoid the inconvenience that the elastic restoring force of each of the beads 41 and 64 is reduced as in the case where the vertical beads 64 and the horizontal beads 41 are made continuous.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
However, the part which is common in 1st embodiment attaches | subjects the same code | symbol as 1st embodiment, and uses description of 1st embodiment.
5A and 5B are partial side views of the bottle container according to the second embodiment.

As shown in these drawings, in the bottle container 1 of the second embodiment, the vertical bead 64 formed on the upper slope 62 of the waist portion 6 and the vertical bead 64 formed on the lower slope 63 have a groove bottom surface ( The vertical bead 64 formed on the vertical surface 61 is different from the first embodiment in that it is a single continuous vertical bead.
In this way, since the vertical bead 64 is also formed on the vertical surface 61, the strength and restoring force of the entire waist portion 6 can be further increased.
In the second embodiment, the number of vertical beads 64 is not limited. For example, the number may be three as shown in FIG. 5A, or may be two as shown in FIG. 5B. Moreover, the effect of this invention is acquired even if the vertical bead 64 is made into one or four or more.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
6 (a) and 6 (b) are partial side views of the bottle container according to the third embodiment.

As shown in these drawings, the bottle container 1 of the third embodiment includes a vertical bead separated into an upper slope 62 and a lower slope 63 of the waist portion 6, and a vertical bead continuous with the upper and lower slopes 62 and the vertical surface 61. The point which combined and formed 64 is different from the said embodiment.
For example, in the bottle container 1 shown in FIG. 6A, a vertical bead 64 having a length substantially matching the vertical width is formed at the center in the left-right direction of the upper slope 62 and the left-right direction of the lower slope 63. A vertical bead 64 having a length substantially matching the vertical width is formed on both sides, and further, a vertical bead 64 shorter than the vertical width is formed at the center in the horizontal direction of the lower slope 63.
Further, in the bottle container 1 shown in FIG. 6B, a vertical bead 64 is formed in the central portion in the left-right direction of the waist portion 6 from the upper inclined surface 62 to the lower inclined surface 63 through the vertical portion 61. A vertical bead 64 having a length substantially matching the vertical width is formed on the left and right sides of the upper and lower slopes 62.
If it does in this way, according to the shape and thickness of the bottle container 1, the strength and the restoring force which match various bottle containers 1 can be provided to the waist part 6 by combining various vertical beads 64 arbitrarily. It becomes possible.

  The present invention is not limited to the above-described embodiment. For example, the shape of the container can be a cup shape, and the container is not limited to a plastic one, such as aluminum. The present invention can also be applied to a container made of a metal material or a material mainly composed of paper. Further, the inclined surface may be formed only on either the lower side or the upper side, and the arrangement relationship of the vertical beads is not limited to that of the above embodiment. Furthermore, even if the vertical bead is formed over a part of the slope, it has an effect of imparting strength and restoring force to the waist portion 6.

  The present invention is applied to a container having a groove-shaped waist portion extending in the lateral direction at the longitudinal intermediate portion of the trunk portion. In particular, it is suitable for a thin plastic bottle container that is lightened.

It is a front view of the bottle container which concerns on 1st embodiment. It is a side view of the bottle container which concerns on 1st embodiment. It is XX sectional drawing of the bottle container which concerns on 1st embodiment. It is YY sectional drawing of the bottle container which concerns on 1st embodiment. (A), (b) is a partial side view of the bottle container which concerns on 2nd embodiment. (A), (b) is a partial side view of the bottle container which concerns on 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottle container 2 Mouth part 3 Shoulder part 4 Trunk part 5 Bottom part 6 Waist part 41 Horizontal bead 61 Vertical surface 62 Upper slope 63 Lower slope 64 Vertical bead

Claims (8)

A container having a groove-shaped waist portion along the horizontal direction in the longitudinal middle portion of the trunk portion,
The waist portion has a slope on the upper and / or lower side of the groove bottom,
One or a plurality of concave groove-shaped vertical beads along the vertical direction are formed such that the outer peripheral edge is defined in a rectangular shape by a ridge line and is recessed inward of the container, and at least the upper slope and / or the lower side A container formed so as to be on a slope.   2. The plurality of concave groove-shaped vertical beads are formed in parallel at predetermined intervals in the lateral direction so as to cover the upper slope and / or the lower slope. container.   The concave groove-shaped vertical bead formed so as to cover the upper slope and the concave groove-shaped vertical bead formed so as to cover the lower slope are concave groove-shaped formed on the groove bottom surface. The container according to claim 1, wherein the container is formed continuously by vertical beads.   The said groove-shaped vertical bead is formed in the front waist part of the said trunk | drum, a back waist part, a left side waist part, a right side waist part, and / or a square waist part. 4. The container according to any one of items 3.   The container according to any one of claims 1 to 3, wherein the concave groove-shaped vertical bead is formed on at least two opposing surfaces of the trunk portion or waist portions at two corners.   6. The horizontal bead is formed on the upper side and / or the lower side of the waist part with a predetermined distance from the concave groove-shaped vertical bead. 6. container.   The container according to claim 1, wherein the container is a rectangular container having a substantially rectangular or square cross section.   The container according to any one of claims 1 to 7, wherein the container is a resin container formed of a thermoplastic resin such as polyethylene terephthalate.

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