WO2011052455A1 - 合成樹脂製丸形壜体 - Google Patents
合成樹脂製丸形壜体 Download PDFInfo
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- WO2011052455A1 WO2011052455A1 PCT/JP2010/068503 JP2010068503W WO2011052455A1 WO 2011052455 A1 WO2011052455 A1 WO 2011052455A1 JP 2010068503 W JP2010068503 W JP 2010068503W WO 2011052455 A1 WO2011052455 A1 WO 2011052455A1
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- Prior art keywords
- circumferential groove
- rib
- ribs
- shape
- synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/40—Details of walls
- B65D1/42—Reinforcing or strengthening parts or members
Definitions
- the present invention relates to a synthetic resin round casing.
- Patent Document 1 describes a round casing having a cylindrical body.
- FIG. 10 shows a casing described in the embodiment of Patent Document 1.
- the casing 101 is a round PET resin casing by so-called biaxial stretch blow molding, a so-called PET bottle, and a mouth tube portion.
- 102, a shoulder portion 103, a trunk portion 104, and a bottom portion 105, and six decompression absorption panels 112 are formed in the peripheral wall of the trunk portion 104 so as to be surrounded by a stepped portion 111.
- circumferential groove ribs 114 are disposed at the upper end and the lower end of the body portion 104.
- the reduced pressure absorption panel 112 is substantially flat, and when the inside of the housing 101 is in a decompressed state, it can be easily deformed inwardly, so that the housing has deformed into an irregular shape.
- a function of absorbing (relaxing) the reduced pressure state (hereinafter referred to as a reduced pressure absorption function) can be exhibited without giving a feeling, that is, inconspicuous.
- the rigidity as the housing is mainly borne by the column portion 113 and the circumferential groove rib 114 formed to remain between the adjacent vacuum absorbing panels 112.
- this type of housing is used in large quantities for food applications, and conventionally, there has been a demand for weight reduction by thinning from the viewpoint of resource saving and cost reduction for packaging.
- the rigidity, buckling strength, and formability of the housing If the wall is too thin, the container will collide with the guide rail of the transport device or in the production line for filling the contents, packing the box, etc.
- the casings collide with each other the lateral wall of the trunk portion is bent into a bent shape due to a lateral load, resulting in a buckling and a problem that the original shape is not restored.
- buckling deformation due to the load in the central axis direction of the housing, that is, the vertical direction is likely to occur.
- the arrangement of the circumferential groove ribs 114 disposed at the upper end and the lower end of the trunk 104 of the casing in FIG. 10 described above is particularly effective for ensuring the surface rigidity of the side peripheral surface of the casing.
- This means is conventionally used.
- the circumferential groove rib is deepened to increase the surface rigidity of the side circumferential surface, the buckling strength in the vertical direction is reduced, and further, blow moldability is reduced, or the surface area is increased by increasing the circumferential groove rib.
- the weight of the entire housing is made constant, there is a problem that the side peripheral wall is further thinned.
- the present invention creates a shape of a circumferential groove rib capable of increasing the surface rigidity of the side circumferential surface without reducing the vertical buckling strength and moldability in the synthetic resin round casing. It is to be an issue.
- the main configuration of the present invention is: In a round housing having a mouth tube portion, a tapered cylindrical shoulder portion, a cylindrical body portion and a bottom portion, Form a pair of circumferential groove ribs in a depressed shape close to the top and bottom at a predetermined height position of the trunk,
- the base in the longitudinal cross-sectional shape of the circumferential groove rib is inclined with respect to the central axis direction of the housing, and the inclination direction of the bottom is reversed between the upper circumferential groove rib and the lower circumferential groove rib. It is said.
- a protruding ridge portion is formed in a circumferential shape between the pair of peripheral groove ribs (hereinafter, the portion is referred to as a peripheral protruding ridge portion).
- the bottom of the circumferential groove rib in the longitudinal cross-sectional shape is inclined with respect to the central axis direction of the housing, and the inclination direction of the bottom is reversed between the upper circumferential groove rib and the lower circumferential groove rib,
- the deformation of the side peripheral wall in the vicinity of the pair of peripheral groove ribs including the peripheral ridges due to the load acting in the vertical direction on the housing can be made constant throughout the entire circumference, so-called "warping" occurrence and local It is possible to effectively suppress the decrease in buckling strength by suppressing the occurrence of a typical buckling deformation.
- the circumferential groove rib is formed of a pair of upper and lower side walls and a bottom wall
- the vertical cross-sectional shape of the side wall corresponds to the side
- the vertical cross-sectional shape of the bottom wall corresponds to the bottom
- the bottom is in the direction of the central axis of the housing.
- the inclination with respect to the bottom wall corresponds to the bottom wall being inclined with respect to the central axis direction of the housing.
- the slope of the bottom is inclined downward in the outward direction in the upper circumferential groove rib and inclined in the upward outward direction in the lower circumferential groove rib, when a force acts on the housing in the vertical direction, The groove width of the groove rib is narrowed, and the circumferential ridge is extended in the direction of bulging outwardly of the entire body through the bottom wall of the upper and lower circumferential groove ribs inclined as described above.
- the groove depth of the circumferential groove rib can be set relatively shallow, and the bottom wall is inclined, so that the moldability and die-cutability in blow molding can be improved, and productivity can be improved. wear. And it becomes possible to suppress the thickness reduction by reducing the degree of unevenness as a whole.
- the slope direction of the bottom is opposite to the above, i.e., if the upper circumferential groove rib is inclined upward and outward, and the lower circumferential groove rib is inclined downward and outward, the circumferential ridge is on the entire circumference.
- a force acts in the direction of depression toward the inside of the housing.
- the direction of the action of the force due to the load in the vertical direction is not a constant direction, but is adjacent vertically.
- the deformation of the circumferential groove ribs interferes with each other, and a slight thickness variation of the side peripheral wall or a slight shift of the applied load causes a partial pressing force or a tensile force to act on the circumferential protrusion.
- the mode of deformation is not constant, There is a part where the circumferential ridge is deformed in a bulging shape toward the outer side of the housing and a part where the circumferential ridge is deformed into a depressed shape in the inner direction.
- the flat cross-sectional shape of the circumferential ridge is deformed from a circle to an ellipse. Then, buckling deformation occurs locally and the buckling strength decreases.
- the height position where the pair of circumferential groove ribs are disposed the number of the circumferential groove ribs, the shape of each circumferential groove rib, such as the groove depth and width, the distance between the upper and lower circumferential groove ribs, etc. It can be appropriately set in consideration of rigidity, required buckling strength, appearance design, moldability, and the like.
- Another configuration of the present invention is that, in the main configuration described above, the longitudinal sectional shapes of the upper circumferential groove rib and the lower circumferential groove rib are symmetrical with each other.
- the action of the force in a certain direction on the circumferential ridge due to the load in the vertical direction can be made more uniform over the entire circumference, and a circular flat cross section on the side circumferential wall in the vicinity of the pair of circumferential groove ribs It becomes possible to more effectively suppress the deformation of the shape.
- Still another configuration of the present invention is that, in the main configuration described above, the slope of the base is inclined downward in the outer direction in the upper circumferential groove rib, and inclined in the upward outer direction in the lower circumferential groove rib. is there.
- the casing is deformed outward in a bulging shape due to a longitudinal load, but in such a casing, the trunk portion is entirely covered with a shrink label.
- the trunk portion is entirely covered with a shrink label.
- a plurality of reduced pressure absorption panels are recessed in a circumferential direction on the side peripheral wall of the body portion, and a pair of peripheral groove ribs are provided between the reduced pressure absorption panel and the shoulder portion. It arrange
- the reduced pressure absorption panel is recessed and reduces the surface rigidity of the side peripheral wall.
- the area where this reduced pressure absorption panel can be arranged is also limited in a small casing, considering the balance between the surface rigidity or buckling strength of the side peripheral wall and the reduced pressure absorption function, the weight reduction by thinning is not possible. It has become a more difficult task.
- the upper and lower ends of the body portion that is, the circumferential groove ribs are formed above and below the reduced pressure absorption panel to complement the reduction in surface rigidity due to the arrangement of the reduced pressure absorption panel.
- a pair of circumferential groove ribs are connected to the tapered cylindrical shoulder portion and arranged in the upper cylindrical portion located between the reduced pressure absorbing panel and the shoulder portion, which has a relatively low buckling strength, thereby providing a longitudinal force. Without impairing the buckling strength against the above action, it is possible to compensate for the reduction in surface rigidity, and it is possible to achieve further weight reduction even in a housing provided with a reduced pressure absorption panel.
- the present invention has the above-described configuration, the following effects can be obtained. That is, in what has the main structure of this invention, while the base of the circumferential groove rib in a longitudinal cross-sectional shape inclines with respect to the central-axis direction of a housing, the inclination direction of this base is made into upper circumferential groove rib.
- the action of the force on the circumferential ridge due to the longitudinal load of the housing can be made uniform in a certain direction over the entire circumference, It is possible to suppress the circular flat cross-sectional shape from being deformed into an elliptical shape at the side peripheral walls in the vicinity of the pair of peripheral groove ribs, Effectively reduces buckling strength due to the formation of a pair of upper and lower circumferential groove ribs in order to suppress the occurrence of “swing” and local buckling deformation in the region and increase the surface rigidity. It is possible to increase the surface rigidity while restraining to the above.
- FIG. 1 It is a whole front view which shows one Example of the round housing of this invention. It is a longitudinal cross-sectional view of the side peripheral wall in the area
- FIG. 7 is an explanatory view showing a modification of the circumferential groove rib of FIG. 6 in a plane cross section along the line PP in FIG. 1. It is a graph which shows the result of a buckling strength test. It is another graph which shows the result of a buckling strength test. It is a whole front view which shows the example of the conventional round housing.
- FIG. 1 and 2 show an embodiment of the round casing of the present invention
- FIG. 1 is a front view
- FIG. 2 is a longitudinal section of a side peripheral wall in a region surrounded by a two-dot chain line in FIG.
- the vertical cross-sectional shape of a pair of upper and lower circumferential groove ribs 7a and 7b is shown.
- This housing 1 is a biaxially stretched blow molded product (pet bottle) made of PET resin, and has a mouth tube portion 2, a tapered tubular shoulder portion 3, a cylindrical body portion 4, and a bottom portion 5, and has an overall height. It is a round casing with a length of 206 mm, a width of 68 mm, and a capacity of 500 ml.
- decompression absorption panels 12 that are vertically long and oval in the circumferential direction are formed on the side peripheral wall of the cylindrical body portion 4 so as to surround the periphery of the step portion 11 in parallel. Between the absorption panels 12, six column portions 13 that bear the rigidity and buckling strength of the housing 1 are left and formed in the vertical direction.
- an upper cylindrical portion 6t in which a cylindrical shape remains without being formed in the reduced pressure absorption panel 12 is located between the upper end portion of the trunk portion 4 and the reduced pressure absorption panel 12 and the shoulder portion 3.
- the lower cylindrical portion 6 b is positioned between the lower end portion of the body portion 4, and between the reduced pressure absorption panel 12 and the bottom portion 5.
- the upper cylindrical portion 6t and the lower cylindrical portion 6b are respectively provided with a pair of circumferential groove ribs 7a and 7b in a recessed shape close to the top and bottom, and the upper circumferential groove rib 7a and the lower circumferential groove rib 7b In the meantime, the peripheral protrusion 9 remains.
- the longitudinal sectional shape of the circumferential groove ribs 7a and 7b is composed of a bottom side 8b and a pair of side sides 8s.
- the bottom side 8b is inclined with respect to the central axis direction Cx of the housing 1, and the inclination direction is
- the circumferential groove rib 7a and the lower circumferential groove rib 7b are configured to be opposite to each other.
- the circumferential groove ribs 7a and 7b are formed of a pair of upper and lower side walls and a bottom wall.
- the vertical cross-sectional shape of the side walls corresponds to the side 8s
- the vertical cross-sectional shape of the bottom wall corresponds to the bottom 8b
- the bottom 8b The inclination with respect to the central axis direction Cx of the body 1 corresponds to the inclination of the bottom wall with respect to the central axis direction Cx of the casing 1.
- the shape of the circumferential groove ribs 7a and 7b formed in the lower cylindrical portion 6b is the same as that shown in FIG.
- the longitudinal sectional shapes of the upper circumferential groove rib 7a and the lower circumferential groove rib 7b are vertically symmetrical with each other, and the inclination direction of the base 8b is the lower outer direction in the upper circumferential groove rib 7a.
- the lower circumferential groove rib 7b has an upward outer direction. More specifically, the maximum groove depth of these peripheral groove ribs 7a and 7b is 1.5 mm, the groove width at the upper end (corresponding to the right end in FIG. 2) is 3 mm, and the inclination angle A1 of the upper peripheral groove rib 7a is The inclination angle A2 of the lower circumferential groove rib 7b is + 25 ° (in FIG. 2, the clockwise direction is positive), and the circumferential collision corresponding to the separation distance between the circumferential groove ribs 7a and 7b.
- the width of the top of the strip 9 is 3 mm.
- FIG. 3 is a schematic explanatory diagram for explaining a deformation mode of the pair of upper and lower circumferential groove ribs 7a and 7b.
- the two-dot chain line indicates the shape before deformation (the shape in FIG. 2), and the thick solid line indicates after deformation. This represents the shape.
- the circumferential groove ribs 7a and 7b are deformed so that the groove width becomes narrower.
- a pressing force acts on the circumferential ridge 9 from above and below, and the circumferential ridge 9 expands in the direction indicated by the black arrow Ds2, that is, toward the outside of the housing 1.
- the force acting on the peripheral protrusion 9 shown by the black arrow in FIG. 2 is likely to act substantially uniformly over the entire periphery.
- the deformation of the peripheral ridge portion 9 from the circular shape of the flat cross-sectional shape to the elliptical shape is suppressed, and the partial bulging deformation of the peripheral ridge portion 9 can be effectively suppressed.
- the deformation mode of the side peripheral wall can be a constant mode as shown in FIG. 3 over the entire circumference, effectively suppressing local buckling deformation due to the longitudinal load, and in the circumferential direction.
- this type of plastic bottle is used with a shrink label from the lower end to the bottom 5 of the shoulder 3.
- the shrink label 21 is indicated by a two-dot chain line, and the state in which the casing 1 of the present embodiment is packaged is shown.
- the shrink label 21 is shown. 21 can suppress the bulging deformation of the peripheral ridge portion 9 shown in FIG. 3, and can more effectively suppress the occurrence of buckling deformation.
- FIG. 4 shows another example of the longitudinal sectional shape of the pair of circumferential groove ribs 7a and 7b.
- the direction of the inclination of the bottom 8b of the circumferential groove rib 7b is reversed. That is, in this example, the inclination angle A3 of the upper circumferential groove rib 7a is + 25 °, and the inclination angle A4 of the lower circumferential groove rib 7b is ⁇ 25 °.
- FIG. 4 when a longitudinal load is applied to the casing 1 having the pair of upper and lower peripheral groove ribs 7a and 7b having the configuration shown in FIG. 4, the side 8s of the peripheral groove ribs 7a and 7b is outlined in FIG. A force, that is, a tensile force acts in a direction as indicated by an arrow, and as a result, a force directed toward the inside of the housing 1 acts on the circumferential protrusion 9 as indicated by a black arrow.
- a force that is, a tensile force acts in a direction as indicated by an arrow, and as a result, a force directed toward the inside of the housing 1 acts on the circumferential protrusion 9 as indicated by a black arrow.
- FIG. 5 is a schematic explanatory diagram for explaining the deformation mode at that time.
- the two-dot chain line represents the shape before deformation (the shape of FIG. 4), and the thick solid line represents the shape after deformation.
- the circumferential groove ribs 7a and 7b are deformed so that the groove width becomes narrower. Due to the action of the vertically inclined base 8b, a tensile force acts on the peripheral ridge 9 and, in contrast to the example of FIG. The strip 9 is deformed into a depressed shape.
- the force acting on the peripheral ridge portion 9 indicated by the black arrow in FIG. 4 is likely to act substantially uniformly over the entire circumference.
- the deformation of the peripheral ridge portion 9 from the circular shape of the flat cross-sectional shape to the elliptical shape is suppressed, and the partial depression deformation of the peripheral ridge portion 9 can be effectively suppressed.
- transformation aspect of the side peripheral wall in the vicinities of a pair of upper and lower peripheral groove ribs 7a and 7b including the peripheral protrusion 9 can be set to the constant aspect shown in FIG.
- production of a "warp" can be suppressed and the surface rigidity of a housing can be effectively enlarged without impairing the buckling strength concerning the load of a vertical direction by a pair of upper and lower circumferential groove ribs 7a and 7b. .
- FIG. 6 corresponds to a comparative example of the longitudinal sectional shape of the pair of circumferential groove ribs 7a and 7b shown in FIGS. 2 and 4, and the base 8b is parallel to the central axis direction Cx of the housing.
- the groove depth of these circumferential groove ribs 7a and 7b is 1.5 mm
- the groove width at the upper end is 3 mm
- the width of the top portion of the circumferential protrusion 9 corresponding to the distance between the circumferential groove ribs 7a and 7b is 3 mm. is there.
- FIG. 7 is a schematic view showing a deformation mode of the circumferential groove ribs 7a and 7b in FIG. 6 in a plane cross section along the line PP in FIG.
- the direction in which the force acts cannot be made constant by the inclined bottom 8b.
- the direction in which the force acts is not determined by a slight thickness variation or a slight shift in the direction of the applied load, and a pressing force acts on the circumferential protrusion 9 or a tensile force acts,
- a portion in which the circumferential ridge portion 9 is deformed in a bulging shape in the outer direction of the housing 1 and a portion in which the circumferential ridge portion 9 is deformed in a depressed shape in the inner direction are formed. As shown, it is deformed from a circular shape to an elliptical shape, buckling deformation occurs locally, and the buckling strength decreases.
- Dl and Ds are the major axis direction and the minor axis direction of the elliptical shape after deformation, respectively.
- the region Ra in the major axis direction indicated by the white arrow in the figure has the peripheral ridge portion 9 as a casing.
- a region bulging in the outward direction and a region Rb in the minor axis direction are regions in which the circumferential protrusion 9 is deformed in a recessed shape in the inner direction of the housing.
- FIG. 8 is a graph showing the change of the longitudinal load (N) according to the displacement (mm) of the total height of the frame in this buckling strength test, and the curve E shows the longitudinal sectional shape of the circumferential groove ribs 7a and 7b.
- FIG. 9 is a graph showing in ellipticity how the flat cross-sectional shape of the peripheral ridge 9 along the line PP in FIG. 1 changes according to the load in the buckling strength test.
- the ellipticity (mm) is the difference between the longest diameter and the shortest diameter in the flat cross-sectional shape, and is used as an indicator of the progress of deformation from a circle to an ellipse.
- the original shape is not deformed from a circle Is 0 mm, and its value increases as ovalization progresses as shown by the solid line in FIG.
- Bp1 is the buckling point of the casing of the example
- Bp2 is the buckling point of the casing of the comparative example
- the buckling strength of the casing of the example is 205.7 N, which is that of the casing of the comparative example.
- the buckling strength was 194.5 N, and the effect of the configuration according to the shape of the circumferential groove rib of the present invention could be confirmed.
- the case of the comparative example is greatly deformed into an elliptical shape from the beginning as compared with the case of the example, and rapidly increases in the vicinity of the buckling point Bp2.
- local buckling deformation occurs in the region indicated by Rbp2 in FIG. That is, from the graph of FIG. 9, as described above, in the case of the comparative example, the deformation of the circumferential protrusion 9 is not constant in the circumferential direction, so-called “warping” occurs, and the outward direction of the case is As shown in FIG. 7, the shape of the flat section of the peripheral protrusion 9 is changed from a circular shape to an elliptical shape. It was confirmed that the buckling strength was lowered due to local buckling deformation due to the ovalization.
- the circumferential groove ribs 7a and 7b of FIG. 2 and FIG. The depth can be set relatively shallow and the bottom wall is inclined, so that the so-called meat circumference in blow molding is good, the die-cutting property is improved, and the productivity can be improved.
- the height position where the pair of circumferential groove ribs are arranged the number of arrangements, the shape of the groove depth and groove width of each circumferential groove rib, the distance between the upper and lower circumferential groove ribs, etc. It can be appropriately determined in consideration of rigidity, required buckling strength, appearance design, moldability, and the like. Further, in the above embodiment, the vertical cross-sectional shapes of the upper and lower circumferential groove ribs 7a and 7b have been described so as to be symmetrical with respect to each other. None do.
- the capacity of the housing is not limited to about 500 ml, and is not limited to PET resin housings, but can be applied to other synthetic resin housings such as polypropylene resins. .
- the synthetic resin round casing of the present invention reduces the buckling strength and moldability in the vertical direction due to the shape of the bottom wall of a pair of upper and lower circumferential groove ribs arranged close to each other. As a result, the surface rigidity of the side peripheral surface can be increased, and a wide range of usage is expected from the viewpoint of resource saving and cost reduction through thinning.
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Abstract
Description
特許文献1には円筒状の胴部を有する丸形壜体についての記載がある。図10にこの特許文献1の実施例で記載される壜体を示すが、この壜体101は2軸延伸ブロー成形による丸形のPET樹脂製壜体、所謂、ペットボトルであり、口筒部102、肩部103、胴部104および底部105から形成され、胴部104の周壁には周囲を段部111で囲うようにして6ケの減圧吸収パネル112が陥没形成されている。また胴部104の上端部と下端部には周溝リブ114が配設されている。
また、壜体の中心軸方向、すなわち縦方向の荷重による座屈変形も発生しやすくなる。
しかしながら、たとえば側周面の面剛性を大きくするために周溝リブを深くすると縦方向の座屈強度が低下する、さらにはブロー成形性が低下する、あるいは周溝リブを深くする分、表面積が増加し、壜体全体の重量を一定とすると側周壁がさらに薄肉化する等の問題を有する。
口筒部とテーパー筒状の肩部と円筒状の胴部と底部を有する丸形壜体において、
胴部の所定高さ位置に、上下に近接して陥没状に一対の周溝リブを形成し、
この周溝リブの縦断面形状における底辺が壜体の中心軸方向に対して傾斜すると共に、この底辺の傾斜方向を上の周溝リブと下の周溝リブとで逆向きにする構成とする、と云うものである。
そして、縦断面形状における周溝リブの底辺が壜体の中心軸方向に対して傾斜すると共に、この底辺の傾斜方向を上の周溝リブと下の周溝リブで逆向きにすることにより、壜体に縦方向に作用する荷重による周突条部を含む一対の周溝リブ近傍における側周壁の変形を全周に亘って一定の態様とすることができ、所謂「よれ」の発生そして局部的な座屈変形の発生を抑制して、座屈強度の低下を効果的に抑制することが可能となる。
周突条部が壜体の外側方向に膨出状に変形する部分と、内側方向に陥没状に変形する部分ができ、その結果、周突条部の平断面形状が円形から楕円形状に変形し、局所的に座屈変形が発生し座屈強度が低下してしまう。
特に小型の壜体ではこの減圧吸収パネルを配設することのできる領域も限定されるので、側周壁の面剛性あるいは座屈強度と減圧吸収機能とのバランスを考慮すると、薄肉化による軽量化はより困難な課題となっている。
すなわち、本発明の主たる構成を有するものにあっては、縦断面形状における周溝リブの底辺が壜体の中心軸方向に対して傾斜すると共に、この底辺の傾斜方向を上の周溝リブと下の周溝リブで逆向きにする構成とすることにより、壜体の縦方向の荷重による、周突条部への力の作用を全周に亘って一定方向に均一にすることができ、一対の周溝リブ近傍の側周壁で円形の平断面形状が楕円形状に変形するのを抑制することができ、
当該領域に「よれ」の発生そして局部的な座屈変形の発生を抑制して、面剛性を高くするために周溝リブを上下一対に形成したことに起因する座屈強度の低下を効果的に抑制しながら、面剛性を大きくすることができる。
図1、2は本発明の丸形壜体の一実施例を示すものであり、図1は正面図、図2は図1中の二点鎖線で囲った領域における側周壁の縦断面であり、上下一対の周溝リブ7a、7bの縦断面形状を示す。
この壜体1はPET樹脂製の2軸延伸ブロー成形品(ペットボトル)であり、口筒部2、テーパー筒状の肩部3、円筒状の胴部4、そして底部5を有し、全高さ206mm、横幅68mmで、容量500mlの丸形壜体である。
また、これら周溝リブ7a、7bの縦断面形状は底辺8bと一対の側辺8sから成るが、底辺8bが壜体1の中心軸方向Cxに対して傾斜しており、その傾斜方向を上の周溝リブ7aと下の周溝リブ7bで逆向きにするような構成としている。(図2参照)
ここで、周溝リブ7a、7bは上下一対の側壁と底壁から形成されるが、側壁の縦断面形状が側辺8s、底壁の縦断面形状が底辺8bに相当し、底辺8bが壜体1の中心軸方向Cxに対して傾斜していることは、底壁が壜体1の中心軸方向Cxに対して傾斜していることに相当する。
なお、下部円筒部6bに形成されている周溝リブ7a、7bの形状は図2に示されるものと同様である。
さらに詳述すると、これら周溝リブ7a、7bの最大溝深さは1.5mm、上端(図2中では右端に相当)での溝幅は3mm、上の周溝リブ7aの傾斜角度A1は-25°、下の周溝リブ7bの傾斜角度A2は+25°(図2中、時計周り方向をプラスとする。)であり、また両周溝リブ7a、7bの離間距離に相当する周突条部9の頂部の幅は3mmである。
この図3にあるように壜体1に縦方向の力Fが作用すると、白抜き矢印Ds1で示されるようにまず周溝リブ7a、7bの溝幅が狭幅化するように変形し、さらに上下の傾斜した底辺8bの作用により、周突条部9に上下方向から押圧力が作用して、黒矢印Ds2に示される方向、すなわち壜体1の外側に向かって周突条部9が膨出状に変形する。
ここで、上記周溝リブ7a、7b近傍の側周壁の形状によれば、図2中の黒矢印で示した周突条部9に作用する力は全周に亘って略均一に作用し易くなり、この周突条部9の平断面形状の円形から楕円形状への変形が抑制され、周突条部9の部分的な膨出変形を効果的に抑制することができる。
図2中には、シュリンクラベル21を二点鎖線で示し、本実施例の壜体1を外装した状態を示しているが、このように壜体1をシュリンクラベル21で外装すると、このシュリンクラベル21により図3に示した周突条部9の膨出状の変形を抑制することができ、座屈変形の発生をより効果的に抑制することができる。
すなわちこの例では上の周溝リブ7aの傾斜角度A3は+25°、下の周溝リブ7bの傾斜角度A4は-25°としている。
この図5にあるように壜体1に縦方向の力Fが作用すると、白抜き矢印Ds3で示されるようにまず周溝リブ7a、7bの溝幅が狭幅化するように変形し、さらに上下の傾斜した底辺8bの作用により、周突条部9に引張力が作用して、図3の例とは逆に黒矢印Ds4に示される方向、すなわち壜体1の内側に向かって周突条部9が陥没状に変形する。
ここで、上記周溝リブ7a、7b近傍の側周壁の形状によれば、図4中の黒矢印で示した周突条部9に作用する力は全周に亘って略均一に作用し易くなり、この周突条部9の平断面形状の円形から楕円形状への変形が抑制され、周突条部9の部分的な陥没変形を効果的に抑制することができる。
これら周溝リブ7a、7bの溝深さは1.5mm、上端での溝幅は3mm、また両周溝リブ7a、7bの離間距離に相当する周突条部9の頂部の幅は3mmである。
また、図7は、壜体に縦方向の荷重が作用した際の、図6の周溝リブ7a、7bの図1中のP-P線に沿った平断面での変形態様を示す概略的な説明図であり、一点鎖線で示した円形が変形前、実線で示した楕円が変形が進行した段階での平断面形状を表している。
図8はこの座屈強度試験における壜体の全高さの変位量(mm)による縦荷重(N)の変化を示すグラフで、曲線Eは上記周溝リブ7a、7bの縦断面形状を図4の形状とした実施例の壜体、曲線Cは比較例の壜体の変位量-荷重曲線を示す。
また、図9は座屈強度試験において、図1中のP-P線に沿った周突条部9の平断面形状が荷重によりどのように変化するかを楕円度で表したグラフである。
ここで楕円度(mm)は、平断面形状における最も長い径と最も短い径の差で、円形から楕円への変形の進行の指標としたもので、元の形状の円形からの変形がない場合には0mm、図7の実線で示したように楕円化が進行するとその値が大きくなる。
すなわちこの図9のグラフから、比較例の壜体では前述したように、周方向で周突条部9の変形態様が一定とならず、所謂「よれ」が発生し、壜体の外側方向に膨出状に変形する部分と、内側方向に陥没状に変形する部分ができ、その結果、周突条部9の平断面形状が図7で示したように円形から楕円形状に変形し、急激な楕円化が原因で局所的に座屈変形が発生し座屈強度が低下してしまうことが確認された。
たとえば、上記実施例では胴部に減圧吸収パネルを配設した丸形壜体について説明したが、本発明の周溝リブの形状に係る構成の作用効果は、減圧吸収パネルの配設のない丸形壜体についても十分に発揮されるものである。
さらに、上記実施例では上下の周溝リブ7a、7bの縦断面形状を相互に上下対称にしたものについて説明したが、底辺8bの傾斜方向を逆にすると云う範疇の中で、必ずしも上下対称にすることはない。
2、102;口筒部
3、103;肩部
4、104;胴部
5、105;底部
6t;上部円筒部
6b;下部円筒部
7a;(上の)周溝リブ
7b;(下の)周溝リブ
8b;底辺
8s;側辺
9 ;周突条部
11、111;段部
12、112;減圧吸収パネル
13、113;柱部
114;周溝リブ
21;シュリンクフィルム
Cx;中心軸
A1、A2、A3、A4;傾斜角度
Claims (4)
- 口筒部(2)とテーパー筒状の肩部(3)と円筒状の胴部(4)と底部(5)を有する丸形壜体において、前記胴部(4)の所定高さ位置に、上下に近接して陥没状に一対の周溝リブ(7a、7b)を形成し、前記周溝リブ(7a、7b)の縦断面形状における底辺(8b)が壜体の中心軸方向(Cx)に対して傾斜すると共に、該底辺(8b)の傾斜方向を上の周溝リブ(7a)と下の周溝リブ(7b)とで逆向きにする構成としたことを特徴とする合成樹脂製丸形壜体。
- 上の周溝リブ(7a)と下の周溝リブ(7b)の縦断面形状を相互に上下対称の形状とした請求項1記載の合成樹脂製丸形壜体。
- 底辺(8b)の傾斜を、上の周溝リブ(7a)では下方外側方向の傾斜とし、下の周溝リブ(7b)では上方外側方向の傾斜とした請求項1または2記載の合成樹脂製丸形壜体。
- 胴部(4)の側周壁に複数の減圧吸収パネル(12)を周方向に並列状に陥没形成し、一対の周溝リブ(7a、7b)を前記減圧吸収パネル(12)と肩部(3)の間に位置する上部円筒部(6t)に配設した請求項1、2または3記載の合成樹脂製丸形壜体。
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AU2010312676A AU2010312676B2 (en) | 2009-10-29 | 2010-10-20 | Synthetic resin round bottle |
KR1020117021850A KR101688673B1 (ko) | 2009-10-29 | 2010-10-20 | 합성수지제 환형 병체 |
CA2777389A CA2777389C (en) | 2009-10-29 | 2010-10-20 | Synthetic resin round bottle |
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USD732396S1 (en) * | 2012-10-15 | 2015-06-23 | Guangdong Haixing Plastic & Rubber Co., Ltd. | Beverage bottle |
JP2016108016A (ja) * | 2014-12-05 | 2016-06-20 | サントリーホールディングス株式会社 | 樹脂製容器 |
JP2017088208A (ja) * | 2015-11-10 | 2017-05-25 | 凸版印刷株式会社 | 液体混合容器 |
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USD858294S1 (en) * | 2016-09-29 | 2019-09-03 | Ocean Spray Cranberries, Inc. | Bottle |
KR102615233B1 (ko) | 2023-06-20 | 2023-12-19 | 한국철도공사 | 자동제어 보조전원장치를 이용한 철도차량 객실용 스마트 멀티 콘센트 시스템 |
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JPH10218148A (ja) * | 1997-01-31 | 1998-08-18 | Yamamura Glass Co Ltd | 合成樹脂製瓶 |
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KR101688673B1 (ko) | 2016-12-21 |
CA2777389C (en) | 2017-06-13 |
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CN102282077B (zh) | 2014-06-11 |
AU2010312676B2 (en) | 2014-04-10 |
US8820555B2 (en) | 2014-09-02 |
JP5688630B2 (ja) | 2015-03-25 |
KR20120076332A (ko) | 2012-07-09 |
US20120175339A1 (en) | 2012-07-12 |
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AU2010312676A1 (en) | 2012-04-19 |
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