JP2005247393A - Container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dent or deformation of a waste section by imparting strength and resiliency necessary for the waste section even in a lightweight, thin-walled container. <P>SOLUTION: The bottle container 1 has the waist section 6 in the vertically middle of a trunk 4. In the container 1, the waste section 6 is formed circumferentially in the trunk 4. The waste section 6 includes a lateral bead 61 in the form of a groove which has inclined faces 61b and 61c extending upward and/or downward from a groove bottom 61a. The waste section 6 also includes recesses 62 extending upward and/or downward from the lateral bead 61 so as to have a similar figure matching the shape of the inclined faces 61b and 61c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a container having a waist portion at an intermediate portion in the vertical direction 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 a bottle container with a large capacity | capacitance, in order to provide intensity | strength required for a trunk | drum, the waist part narrowed along the circumferential direction is formed in the up-down 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, it is required to provide necessary strength and resilience by forming a horizontal bead etc. in the body part to prevent the bottle container from being dented or deformed. (For example, refer to Patent Documents 1 and 2).
Japanese Patent No. 3059975 JP-A-8-310521

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

  Further, Patent Documents 1 and 2 show a container in which a recess is formed in the waist part, but the recess is a part of which the bottom vertical width of the waist part is partially expanded. When applied to a thin-walled container, the necessary strength and resilience are not imparted to the waist portion and the vicinity thereof, and it is considered difficult to prevent the dent and deformation of the waist portion.

  The present invention has been considered in light of the above circumstances, and in a thin-walled container that has been reduced in weight, in particular, the waist portion and its vicinity are provided with the necessary strength and resilience, and the dent and deformation of the waist portion. It is an object of the present invention to provide a container that can prevent the above.

  In order to achieve the above object, the container of the present invention is a container having a waist portion in the middle in the vertical direction of the trunk portion, wherein the waist portion is formed along the circumferential direction of the trunk portion, and is above the groove bottom surface. And / or a groove-shaped horizontal bead having an inclined surface on the lower side, and a concave portion formed on the upper side and / or the lower side of the horizontal bead, and the vertical cross-sectional shape of the concave portion is convex toward the outside of the container. It is set as the shape made into the shape folding surface and / or curved surface.

  In this way, the strength of the waist can be increased by the streaks formed at the boundary between the recess and the slope, and the strength required for the waist and its vicinity can be reduced even if the container is thin. Further, it is possible to impart resilience and prevent dents and deformation of the waist. Moreover, since the recessed part has the convex folding surface and / or curved surface which go to the outer side of a container, the internal volume of a container is not reduced.

Moreover, the container of this invention is set as the structure which the vertical cross-sectional shape of the said recessed part has a part similar to the vertical cross-sectional shape of the said horizontal bead slope.
If it does in this way, since the acting direction of the restoring force in a crevice and a slope corresponds, restoration nature can be raised further.

Moreover, the container of this invention is set as the structure where the front shape of the said recessed part is a substantially trapezoid regular trapezoid or reverse trapezoid, and the long side contacts the bottom face of the said horizontal bead.
If it does in this way, since two stripes formed in the right and left both ends of a crevice become narrow toward the upper part or the lower part from a waist part, when a container is grasped, it will occur along two stripes. The broken lines can be joined at the center of the container. As a result, the two creases cancel each other, not only can the deformation of the container be suppressed, but also can be easily restored.

Moreover, the container of this invention is set as the structure which formed the 2 or more stripe | line | column parallel to each other in the container circumferential direction or the perpendicular direction in the said recessed part. If it does in this way, the intensity | strength of a recessed part will be raised with the line | wire formed in the recessed part, and when a recessed part is crushed, it will become easy to restore | restore a line | wire as a skeleton.
Further, one or more sets of two lines that are non-parallel to each other and symmetrical with respect to the container center line are formed in the recess. If it does in this way, the intensity | strength and grip property of a waist part can be improved with the line | wire formed in a recessed part. Moreover, since one or more pairs of two lines join at the center of the container and cancel each other, the restoring force can be further enhanced.

Moreover, as for the container of this invention, the vertical width of the said recessed part is 1 to 4 times with respect to the vertical width of the bottom part of the said horizontal bead.
In this case, not only the effect of the present invention is sufficiently exhibited, but also a container having a good appearance can be obtained.

Moreover, as for the container of this invention, the depth of the said recessed part is 3-10% with respect to the aperture width of the said waist part.
If it does in this way, the effect of the present invention will not be fully exhibited, but a fall of grip nature can be avoided.

Moreover, the container of this invention is set as the structure by which the said recessed part is formed in the at least 2 surface which the said trunk | drum counters.
If it does in this way, the resilience with respect to a dent and a deformation | transformation can be improved in two surfaces of the trunk | drum which is easy to collide with the adjacent container at the time of container conveyance.

Moreover, when the cross-sectional shape of the said trunk | drum is substantially rectangular, it is set as the structure by which the said recessed part is formed in two surfaces of the said trunk | drum used as the long side.
If it does in this way, the resilience with respect to a dent and a deformation | transformation can be improved in two surfaces of the trunk | drum hold | gripped when holding a container.

  As described above, according to the present invention, since the necessary strength and resilience are imparted to the waist portion by the recess formed in accordance with the slope shape of the waist portion, in a thin container in which weight reduction is achieved. In addition, the dent and deformation of the waist can be prevented.

  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 the ethylene terephthalate unit, and has 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, and the like. 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. Suitable for bottle containers 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 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 a front view showing a waist portion of the bottle container according to the first embodiment. FIG. 4 is a partially cutaway side view showing the waist portion of the bottle container according to the first embodiment, and FIG. 5 is an XX 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 waist part 6 squeezed along the circumferential direction is formed in the middle part of the body part 4 in the vertical direction. The waist part 6 is a part having both a reinforcing part function for imparting a necessary strength to the body part 4 and a gripping part function for facilitating handling when the bottle container 1 is held with one hand. 61 and a recess 62.

  Here, the horizontal bead 61 refers to a concave groove formed along the circumferential direction of the body 4. The horizontal bead 61 in this embodiment has inclined surfaces 61b and 61c on the upper and lower sides of the vertical groove bottom surface 61a. The upper slope 61b and the lower slope 61c of the present embodiment are arcuate surfaces having predetermined R dimensions (the slope 61b is R20 and the slope 61c is R30, not shown), 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.

  Moreover, in this embodiment, the hollow 61d for holding | grip is formed in the horizontal bead 61 of the container front and container back which is a long side. This dimple 61d is formed in the central portion of the horizontal bead 61, and improves gripping properties by allowing a finger to enter when the bottle container 1 is gripped. Furthermore, a plurality of vertical protruding ribs 61e are formed in the recess 61d, and the sliding of fingers is prevented by these protruding ribs 61e.

The recessed part 62 is formed in the waist part 6 in order to suppress the strength fall accompanying the thinning of the bottle container 1, and the fall of a restoring property. Although the recessed part 62 of this embodiment is formed in the lower side of the horizontal bead 61, you may form in the upper side of the horizontal bead 61 and may be formed in the upper and lower sides of the horizontal bead 61. FIG.
In the longitudinal direction of the recess 62, a similar portion 62c (R26) is formed in accordance with the longitudinal sectional shape (R30) of the lower slope 61c. Preferably, when the lower inclined surface 61c is an arc surface as in the present embodiment, as shown in FIG. 4, the surface 62c in the recess 62 is an arc surface concentric with the lower inclined surface 61c.

  When such a recess 62 is provided in the waist part 6, not only can the strength of the waist part 6 be increased by the streaks 62a formed at the boundary between the recess 62 and the lower slope 61c, but also when dents and deformations occur. In addition, the restoring force of the lower inclined surface 61c and the recessed part 62 acts in the same direction, and the dents and deformation are easily restored. Thereby, even if it is the thin bottle container 1 achieved in weight reduction, it is possible to give the necessary strength and resilience to the waist portion 6 and its vicinity, and to prevent the dent and deformation of the waist portion 6. Become.

The front shape of the recess 62 is preferably an isosceles inverted trapezoid whose long side is in contact with the bottom surface 61a of the horizontal bead 61 (or an equilateral legged trapezoid when formed on the upper slope 61b).
When the recess 62 is formed in such a shape, the two streaks 62a formed at the left and right ends of the recess 62 become narrower downward from the waist portion 6, so as shown in FIG. A broken line generated along the two lines 62 a when the container 1 is gripped can be joined at the center of the bottle container 1. As a result, the two creases cancel each other, not only can the deformation of the bottle container 1 be suppressed, but also can be easily restored.

Further, it is preferable that one or more sets of two streaks 62b that are non-parallel to each other and symmetrical with respect to the container center line are formed in the recess 62. In the present embodiment, these streaks 62b are formed by steps, but the streaks 62b may be formed by convex ribs or grooves. Further, the number of the streaks 62b is not limited to the number of the present embodiment, and can be arbitrarily set according to the dimensions of the bottle container 1 and the recess 62.
When such a line 62b is formed in the recess 62, not only the strength and gripping property of the waist part 6 can be improved, but also the broken line generated along the pair of lines 62b when the bottle container 1 is gripped. Since it merges in the center part of the container 1 and cancels each other, the restoration becomes easy.
Although not shown, one or two or more parallel lines can be formed in the recess 62 in the container circumferential direction or in the vertical direction. If it does in this way, the intensity | strength of the recessed part 62 will be raised with the line | wire formed in the recessed part, and when the recessed part 62 is crushed, it will become easy to restore | restore a line | wire as a skeleton.

  The vertical width W2 of the recess 62 is preferably 1 to 4 times the bottom vertical width W1 of the horizontal bead 61. In this way, not only the effect of the present invention is sufficiently exhibited, but also a bottle container 1 having a good appearance can be obtained. That is, when the vertical width W2 of the concave portion 62 is smaller than the vertical width W1 of the bottom portion of the horizontal bead 61, the streaks 62a are shortened. Unable to get resilience. Conversely, if the vertical width W2 of the recess 62 exceeds four times the bottom vertical width W1 of the horizontal bead 61, the muscle 62a becomes longer, the rigidity of the muscle itself is reduced, and the restoring force is reduced. In addition, the appearance of the bottle container 1 is also lowered.

  The depth H1 of the recess 62 is preferably 3 to 10% with respect to the aperture width H2 of the waist portion 6. If it does in this way, not only the effect of the present invention will be exhibited sufficiently, but also a decrease in gripping property can be avoided, and the content of the container will not change greatly. That is, when the depth H1 of the concave portion 62 is less than 3% with respect to the aperture width H2 of the waist portion 6, the necessary strength and restoring force cannot be obtained. When it exceeds 10% with respect to the squeezing width H2 of the portion 6, the gripping property and appearance of the bottle container 1 are deteriorated, and the inner volume of the container is greatly reduced.

  The recess 62 is preferably formed on at least two opposing surfaces of the body 4, and in particular, when the body 4 has a substantially rectangular cross-sectional shape, it is formed on the two surfaces of the body 4 that are the long sides. It is preferred that If it does in this way, the resilience with respect to a dent and a deformation | transformation can be improved in two surfaces of the trunk | drum 4 which is easy to collide with the adjacent bottle container 1 at the time of container conveyance. In the case where the concave portions 62 are formed on the two long surfaces, the resilience to the dents and deformations that occur when the bottle container 1 is gripped can be enhanced.

[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.
FIG. 6A is a front view showing a waist portion of the bottle container according to the second embodiment, and FIG. 6B is a YY sectional view of the bottle container according to the second embodiment.

As shown in these drawings, the bottle container 1 of the second embodiment is different from the first embodiment in that the recess 61d and the convex rib 61e are not formed in the horizontal bead 61.
Even in such a bottle container 1, the same effect as that of the first embodiment can be obtained by forming the above-described recess 62 on the upper side and / or the lower side of the horizontal bead 61.

  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 arrangement relationship of the vertical beads is not limited to that of the above embodiment.

  The present invention is applied to a container having a waist portion squeezed along the circumferential direction at an intermediate portion in the vertical direction 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 a front view which shows the waist part of the bottle container which concerns on 1st embodiment. It is a partially cutaway side view which shows the waist part of the bottle container which concerns on 1st embodiment. It is XX sectional drawing of the bottle container which concerns on 1st embodiment. (A) is a front view which shows the waist part of the bottle container which concerns on 2nd embodiment, (b) is YY sectional drawing of the bottle container which concerns on 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottle container 2 Mouth part 3 Shoulder part 4 Body part 5 Bottom part 6 Waist part 61 Horizontal bead 61a Groove bottom face 61b Upper slope 61c Lower slope 62 Recessed part 62a, 62b Muscle 62c The part similar to the horizontal bead vertical direction slope in a recessed part

Claims (9)

A container having a waist portion in the middle in the vertical direction of the trunk portion,
The waist is
A concave groove-shaped lateral bead formed along the circumferential direction of the body portion and having a slope on the upper side and / or lower side of the groove bottom;
A recess formed on the upper side and / or the lower side of the horizontal bead,
The container characterized in that the longitudinal cross-sectional shape of the concave portion is a convex folded curved surface and / or curved surface facing the outside of the container.   The container according to claim 1, wherein a vertical cross-sectional shape of the concave portion has a portion similar to a vertical cross-sectional shape of the horizontal bead slope.   The container according to claim 1 or 2, wherein the front shape of the recess is a substantially trapezoidal trapezoidal or inverted trapezoid, and a long side thereof is in contact with a bottom surface of the horizontal bead.   The container according to any one of claims 1 to 3, wherein one or two or more parallel lines are formed in the container circumferential direction or the vertical direction in the recess.   The container according to any one of claims 1 to 3, wherein one or more sets of two streaks that are non-parallel to each other and symmetrical with respect to the container center line are formed in the recess.   The container according to any one of claims 1 to 5, wherein the vertical width of the concave portion is 1 to 4 times the vertical width of the bottom of the horizontal bead.   The depth of the said recessed part is 3 to 10% with respect to the aperture width of the said waist part, The container in any one of Claims 1-6 characterized by the above-mentioned.   The container according to claim 1, wherein the concave portion is formed on at least two opposing surfaces of the body portion.   The container according to any one of claims 1 to 8, wherein when the cross-sectional shape of the body portion is substantially rectangular, the concave portion is formed on two surfaces of the body portion which are long sides thereof.

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