WO2019131542A1 - 合成樹脂製容器 - Google Patents

合成樹脂製容器 Download PDF

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Publication number
WO2019131542A1
WO2019131542A1 PCT/JP2018/047338 JP2018047338W WO2019131542A1 WO 2019131542 A1 WO2019131542 A1 WO 2019131542A1 JP 2018047338 W JP2018047338 W JP 2018047338W WO 2019131542 A1 WO2019131542 A1 WO 2019131542A1
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Prior art keywords
container
cross
shape
section
sectional shape
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Ceased
Application number
PCT/JP2018/047338
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English (en)
French (fr)
Japanese (ja)
Inventor
大樹 安川
秀彦 勝田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Seikan Group Holdings Ltd
Toyo Seikan Co Ltd
Original Assignee
Toyo Seikan Kaisha Ltd
Toyo Seikan Co Ltd
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Application filed by Toyo Seikan Kaisha Ltd, Toyo Seikan Co Ltd filed Critical Toyo Seikan Kaisha Ltd
Publication of WO2019131542A1 publication Critical patent/WO2019131542A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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—Rigid or semi-rigid 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 or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents

Definitions

  • the present invention relates to a synthetic resin container that can be used for applications such as carbonated beverages in which the inside of the container is filled with positive pressure after filling and sealing the contents.
  • a container made of synthetic resin is formed by forming a bottomed cylindrical preform using a thermoplastic resin such as polyethylene terephthalate, and then forming the preform into a bottle shape by biaxial stretch blow molding or the like. It is generally used in a wide field as a container containing various beverage products and various seasonings as contents.
  • a square bottle having a square tubular container shape has advantages such as high storage efficiency at the time of boxing for transportation and good space efficiency at the time of display at a store.
  • advantages such as high storage efficiency at the time of boxing for transportation and good space efficiency at the time of display at a store.
  • synthetic resin containers of this type has become more common in a wide range of fields, to differentiate from other products and enhance product appeal. It has been demanded.
  • the rectangular tubular container shape can be applied to a container having carbonated beverages and the like whose container shapes applicable are limited, the product appeal can be enhanced by diversification of the design.
  • the container body portion is formed in a cylindrical shape, and the bottom portion thereof is positive pressure inside the container.
  • the container body portion is formed into a so-called petaloid shape in which the five legs that bulge downward are arranged in a petal shape, and the deformation of the bottom is suppressed doing.
  • the bottom portion suitably designed for the conventional pressure-resistant bottle in which the container body portion is formed in a cylindrical shape is applied as it is
  • the balance between the polygonal shape of the trunk and the deformation due to the internal pressure of the petal-like shape at the bottom is not good, a direction prone to fall by external force is generated, and the self-sustainability is not stable. I could not deny the feeling.
  • the inventor of the present invention has further studied that the synthetic resin can be used for carbonated beverages and the like, having a bottom portion having an external shape suitable for a synthetic resin container having a body having a polygonal cross-sectional shape.
  • the external shape refers to a shape that appears on the outside in a state where the container is made to stand.
  • the bottom portion having an external shape suitable for a container having a body having a polygonal cross-sectional shape is mainly a container which is self-supporting, the outer shape of the bottom is uniform with the outer shape of the body. And have self-supporting stability.
  • the present invention is a container made of synthetic resin having a body having a polygonal cross-sectional shape, which has an external shape suitable for the cross-sectional shape of the body, and after filling and sealing the contents, the container
  • An object of the present invention is to provide a synthetic resin container provided with a bottom capable of sufficiently suppressing deformation when the inside becomes positive pressure.
  • a container made of synthetic resin according to the present invention is a container made of synthetic resin, which has a mouth, a shoulder, a body, and a bottom, and the body is formed in a rectangular tube shape having a polygonal cross section.
  • the bottom portion extends from the center of the bottom portion toward the lower end side of the side surface of the body portion, and has a plurality of bottom portions including a groove bottom having an arc shape whose longitudinal cross section is convex outward of the container.
  • the bottom grooves are equally spaced apart by the bottom groove and having a plurality of legs projecting downward below the center of the bottom, the legs being arranged in rotational symmetry about a central axis It is set as the structure arrange
  • FIG. 3 is an end view taken along line AA of FIG. 2;
  • FIG. 3 is an end view taken along the line BB of FIG. 2;
  • FIG. 3 is an explanatory view in which an end face AA of FIG. 2 and an end face BB of FIG. 2 are overlapped on the same plane.
  • It is explanatory drawing which shows the cross-sectional shape of the container trunk
  • FIG. 13 It is a perspective view which shows the outline of the container for comparison used in the present Example.
  • A An explanatory view schematically showing an arrangement relationship between bottom grooves and legs in the bottom of the synthetic resin container of the first embodiment according to the present invention, and (b) bottom grooves and legs in the bottom of a comparative container It is explanatory drawing which showed the arrangement
  • A A cross-sectional view appearing in a cross section obtained by cutting the container along a vertical plane including the AA-A 'line in FIG. 13.
  • FIG. 1 shows a perspective view obtained by cutting the container 1 along a horizontal plane including the line AA in FIG. 2 and FIG. 3 shows an end surface appearing in the cross section obtained by cutting the container 1 along a horizontal plane including the line BB in FIG. Shown in 4.
  • the thickness of the container 1 is omitted.
  • the container 1 is provided with a mouth 2, a shoulder 3, a body 4, and a bottom 5.
  • the container 1 shown as an embodiment of the present invention has a body 4 formed in a square tube shape in general. , Has a container shape called a square bottle.
  • Such a container 1 is formed into a bottomed cylindrical preform by injection molding, compression molding or the like using a thermoplastic resin, and is formed into a predetermined container shape by biaxial stretch blow molding or the like.
  • thermoplastic resin any resin that can be blow-molded can be used as the thermoplastic resin to be used.
  • thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, amorphous polyarylate, polylactic acid, and copolymers thereof, and those blended with these resins or other resins are preferable. It is.
  • ethylene terephthalate thermoplastic polyesters such as polyethylene terephthalate are suitably used.
  • polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can also be used.
  • the mouth 2 is a cylindrical portion which is an outlet for taking out contents, and a lid (not shown) for sealing the inside of the container is attached to the mouth 2. Further, the lower end of the mouth 2 is expanded in diameter toward the body 4 and is connected to the shoulder 3 connecting the mouth 2 and the body 4, and in the illustrated example, the shoulder 3 is a pyramid It is formed in a trapezoid shape.
  • the body 4 is a portion that occupies most of the height direction of the container 1, the upper end is connected to the shoulder 3, and the lower end is connected to the bottom 5.
  • the height direction refers to the direction orthogonal to the horizontal plane when the container 1 is erected on the horizontal plane with the mouth 2 up, and in this state, the vertical and horizontal directions of the container 1 and the horizontal and vertical directions Shall be defined.
  • the body portion 4 is formed in a rectangular tube shape whose corner portion is chamfered in an R-chamfered shape with a square cross-sectional shape (shape of a cross section orthogonal to the height direction) as a basic shape.
  • the four surfaces remaining after chamfering the corner of the body 4 are the side surfaces of the body 4.
  • drum 4 has the ditch
  • six concave grooves 40 are arranged side by side at equal intervals along the height direction, and the cross-sectional shape (see FIG. 4) of the portion where the respective concave grooves 40 are formed is the trunk 4 It is formed to be similar to the cross-sectional shape (refer to FIG. 3) of the portion formed in the rectangular tube shape. Then, as shown in FIG.
  • the respective apexes 40A of the cross sectional shape of the portion where the concave groove portion 40 is formed is inscribed in a manner inscribed in the sides of the cross sectional shape of the rectangular cylindrical portion of the trunk 4 It is formed as.
  • the respective top portions 4A are chamfered in an R-chamfered shape
  • the portion where the recessed groove portion 40 is formed is also formed to have a cross-sectional shape in which each top portion 40A is chamfered in an R-chamfered shape, with a square shape as a basic shape.
  • the chamfered top portion 40A of the cross-sectional shape of the portion where the recessed groove portion 40 is formed is located at the central portion in the cross-sectional direction of the side surface of the trunk portion 4.
  • a square bottle whose cross-sectional shape of the body is a square tries to deform the side surface of the body so that the container bulges outward.
  • a force acts on the corner of the body, and a force acts to deform the corner so as to draw the corner inward of the container.
  • the square bottle is deformed such that the cross-sectional shape of the barrel is circular.
  • the concave groove is formed in an annular shape in the body of a square bottle whose cross-sectional shape is square
  • the cross-sectional shape of the portion where the annular concave groove is formed is circular It becomes.
  • the internal pressure (force) acts uniformly on the entire reinforcing rib, so that it is difficult for the region where the annular reinforcing rib is formed to expand outward.
  • an internal pressure (force) is applied to deform so as to expand outward, the side is easily expanded and deformed, and the corner is drawn inward of the container. Due to the deformation, it becomes impossible to maintain the square shape of the barrel of the square bottle (see FIG. 7).
  • the portion where the recessed groove portion 40 is formed is deformed so as to bulge outward at the portion corresponding to each side of the cross sectional shape.
  • the force is applied, and the force corresponding to each top 40A of the cross-sectional shape is exerted to be deformed so as to be drawn inward of the container. Then, as shown by arrows in FIG.
  • the cross-sectional shape of the portion where the recessed groove portion 40 is formed is similar to the cross-sectional shape of the portion formed in a square tube shape of the trunk portion 4 and the crossing of the portion where the recessed groove portion 40 is formed.
  • the recessed groove portion 40 is formed by forming the recessed groove portion 40 such that the respective top portions 40A of the surface shape are inscribed in the sides of the cross sectional shape of the rectangular cylindrical portion of the trunk portion 4. The force acting on the formed portion offsets the force acting on the square cylindrical portion of the body 4, and deformation due to the swelling of the body 4 can be effectively suppressed.
  • each apex 40A of the cross-sectional shape of the portion where the recessed groove portion 40 is formed is inscribed in the lateral cross-sectional shape of the portion formed in the rectangular cylinder shape of the trunk portion 4, the trunk portion 4 If it is possible to offset the force acting on the portion formed in the rectangular tube shape, the cross sectional shape of the portion in which the recessed groove portion 40 is formed and the cross sectional shape of the portion formed in the rectangular tube shape of the trunk portion 4 are Each basic shape should be similar to the extent that it can be recognized as a similar polygonal shape having the same number of sides and the same number of apexes.
  • FIG. 8 is a perspective view schematically showing the bottom 5 of the container 1 according to the present embodiment, but the bottom 5 extends from the bottom center 50 toward the lower end of the side of the trunk 4 and is a longitudinal cross section.
  • the part of the bottom 5 is indented inside the container so that the surface shape (the shape of the cross section taken along the surface including the central axis C) includes a groove bottom formed in a convex arc shape toward the outside of the container. And four bottom grooves 51.
  • the four legs 52 separated by the bottom groove 51 and formed so as to project downward from the bottom center 50 are arranged in rotational symmetry (four-fold symmetry in the example shown) around the central axis C.
  • the bottom grooves 51 are provided radially at an equal interval and centered on the bottom center 50 so as to be positioned below the corner of the body 4 respectively.
  • a force acts to deform the container outward, that is, downward and outward.
  • the center of the bottom of the container 1 is deformed so as to expand downward by the action of the downward expansion force, there is a risk of causing the so-called bottom-off state and interfering with the self-sustaining ability of the container. is there.
  • the outer shape of the container in particular, the cross-sectional shape tends to be deformed into a circular shape.
  • the bottom groove 51 is formed such that the bottom of the groove extends from the bottom center 50 toward the lower end side of the side surface of the body 4. For this reason, as compared with the case where the bottom groove 51 is formed so that the groove bottom extends from the bottom center 50 toward the lower end side of the corner of the body 4, from the start end along the extension direction of the bottom groove 51 The length to the end is shortened, and the aspect ratio (horizontal / longitudinal) of the arc shape in the vertical cross-sectional shape of the groove bottom of the bottom groove 51 can be reduced.
  • the “aspect ratio” is the bottom along the direction orthogonal to the height direction with respect to “the length from the bottom center 50 to the end of the bottom groove 51 along the height direction (length in the vertical direction)”
  • the ratio of the length from the center 50 to the bottom groove 51 (the length in the lateral direction) is referred to.
  • the downward deformation of the bottom groove 51 in the container height direction is achieved by forming the bottom groove 51 so as to include the groove bottom extending from the bottom center 50 toward the lower end side of the side surface of the barrel 4. It is possible to effectively suppress the height change rate of the bottom center 50 in the container height direction to a small value.
  • the height of the bottom center 50 in the container height direction refers to the height direction of the container from the bottom center 50 to the ground contact portion 53 of the leg 52 that contacts the ground plane (not shown) when the container 1 is made to stand. Refers to the height of
  • the leg whose longitudinal cross-sectional shape is formed in an arc shape and whose most part is formed in a planar or linear shape compared to the bottom groove 51 having a shape that receives pressure from the inside of the container 1 uniformly.
  • the portion 52 tends to expand due to the pressure from inside the container 1.
  • the leg 52 is provided at a position corresponding to the corner of the body 4.
  • the bottom portion 5 extends from the bottom center 50 toward the lower end side of the side surface of the trunk portion 4 and the longitudinal cross-sectional shape is formed into an arc shape convex outward of the container
  • a plurality of bottom grooves 51 including the groove bottoms, and the bottom grooves 51 are arranged at equal intervals and radially about the bottom center 50 so that the legs 52 are arranged in rotational symmetry about the central axis
  • the leg 52 is disposed at a position corresponding to the corner of the body 4, so that the external shape of the bottom 5 is made the body while maintaining the self-supporting property of the container. It can be easily formed into a shape suitable for the cross-sectional shape.
  • the bottom groove 51 is formed so that the arrangement with respect to each side surface is equal to one with respect to one side surface of the body 4 having a square cross-sectional shape.
  • the bottom groove 51 is formed so that at least one to the one side surface of the body 4 and the arrangement to each side surface become equal.
  • the respective bottom grooves 51 are extended toward a position symmetrical with respect to the center in the lateral width direction of the side. It is more preferable for the self-supporting stability and shape maintenance of the container 1 to be provided so that the arrangement to each side is equal.
  • At least one bottom groove 51 provided for one side surface is provided so as to extend from the bottom center 50 toward a position corresponding to the lateral width direction center of the side surface of the body 4. And, it is more preferable for the self-supporting stability and shape maintenance of the bottom part 5.
  • the bottom groove 51 provided to extend toward a position corresponding to the center in the lateral width direction of the side surface of the body 4 is from the bottom center 50 to the lower end side of the side surface of the body 4
  • the length from the start to the end along the extension direction of the bottom groove 51 can be made the shortest. As a result, when receiving pressure from the inside of the container, the load in the downward direction of the bottom groove 51 can be suitably suppressed.
  • the bottom groove 51 may be formed to any width as long as the shape of the bottom can be maintained.
  • the width of the bottom groove 51 is formed to be 2 mm or more and less than 15 mm. Is preferred.
  • the shape of the curve extending from the bottom center 50 to the side of the body 4 in the longitudinal cross-sectional shape of the bottom groove 51 is not particularly limited as long as the shape can be maintained when the pressure in the container becomes positive.
  • the aspect ratio (horizontal / longitudinal) of the arc shape in the vertical cross-sectional shape of the groove bottom of the bottom groove 51 is 1.2 or more and less than 1.6, the bottom 5 It is preferable because the external appearance shape of can be maintained suitably.
  • the height difference between the bottom center 50 and the ground surface of the container 1 (the ground portion 53 of the leg 52) in the container height direction is not particularly limited as long as the shape of the bottom 5 can be maintained when the pressure in the container is positive.
  • the width of the body 4 is 60 mm, it is preferably 3.0 to 4.0 mm.
  • the container 1 in which the cross-sectional shape of the body 4 is square is taken as an example, but the body 4 may have a polygonal cross-section, and the body 4 may have a cross-section It can be formed into an n-angular shape (where n is 3 to 12). Then, depending on the volume of the container 1 and the number n of the apexes of the cross-sectional shape of the body 4, two or more bottom grooves 51 may be arranged equally to each side of one side of the body 4. The range in which the self-supporting stability of the container 1 is not impaired by arranging or changing the arrangement of the bottom groove 51 so that the number of the legs 52 of the bottom 5 is equal to a submultiple of 3 or more of n.
  • the configuration of the bottom 5 can be changed as appropriate.
  • two bottom grooves 51 are arranged on one side of the body 4 so that the arrangement on each side is equal.
  • the number of legs 52 is 12 (in this case, the legs 52 are arranged six times symmetrically), or one of the six side surfaces on which the bottom grooves 51 are arranged, every other leg
  • the number 52 can be 3 (in this case, the legs 52 are arranged three times symmetrically).
  • the side surface on which the bottom groove 51 is disposed may be alternated with two or three.
  • the cross-sectional shape of the body 4 is different from that of the first embodiment.
  • the trunk portion 4 is formed into a rectangular tube shape whose corner portion is chamfered in a C-chamfered shape with the square cross-sectional shape as a basic shape, and is chamfered When including a surface (hereinafter also referred to as a chamfered surface), it has an octagonal cross-sectional shape. That is, the trunk
  • the chamfering width at the time of chamfering the corner of the body 4 is equal to or less than the lateral width of the side of the barrel 4 remaining after chamfering the corner, and a small R is made at the boundary with the chamfered surface. You may put it on.
  • FIG. 10 is an explanatory view showing, in an overlapping manner, the cross-sectional shape of the rectangular tube-shaped portion of the body 4 of the barrel 1 of the second embodiment and the cross-sectional shape of the portion where the concave groove 40 is formed. It is. As illustrated, in the second embodiment, since the cross-sectional shape of the portion formed in a square tube shape of the trunk portion 4 has a square shape as a basic shape, the portion where the recessed groove portion 40 is formed is also It is formed so that it may become the cross-sectional shape which made the square shape the basic shape.
  • Each apex of the recessed groove portion 40 is formed in a square shape in which each apex is R-chamfered (R-chamfered with a reduced radius of curvature), and any recessed groove portion 40 is a cross section of a portion where the recessed groove portion 40 is formed.
  • the respective apexes 40A of the shape are formed to be inscribed in the respective sides of the cross-sectional shape of the rectangular cylindrical portion of the trunk portion 4.
  • the chamfered top portion 40A of the cross-sectional shape of the portion where the recessed groove portion 40 is formed is located at the central portion in the cross-sectional direction of the side surface of the trunk portion 4.
  • groove part 40 was formed is curved so that it may become circular arc shape which becomes convex a little to container outward, and it is formed in planar shape.
  • the cross-sectional shape of the rectangular tube-shaped portion of the body 4 and the cross-sectional shape of the portion where the recessed groove portion 40 is formed have similar basic shapes to each other. Have similar relationships in a broad sense.
  • bottom 5 extends from bottom center 50 to a position corresponding to the center of the width of the side of trunk 4 from the bottom center 50 to the lower end of the side of trunk 4.
  • the vertical cross-sectional shape is formed to include a groove bottom formed in a convex arc shape toward the outside of the container 1, and the legs 52 are equally disposed so as to be rotationally symmetrical about the central axis C. It is radially disposed centering on the bottom center 50 at regular intervals.
  • the bottom toward the lower end side of the square side which is the basic shape of the cross-sectional shape By providing the groove 51, deformation of the bottom 5, in particular, the downward expansion of the bottom center 50 and the outward expansion of the position corresponding to the side surface of the body 4 are effectively prevented, and the container 1 is free standing. It is possible to raise Although the number of the legs 52 of the bottom 5 is four for the octagonal shape of the trunk 4 cross section, these legs 52 correspond to the corners of the basic shape of the trunk 4 cross section. Therefore, the external shape of the bottom portion 5 can be easily formed into a shape suitable for the cross-sectional shape of the trunk portion 4 while maintaining the self-supporting property of the container.
  • the chamfering width when chamfering the corner of the body 4 may be equal to the lateral width of the side of the barrel 4 remaining after chamfering the corner, in which case the side surface of the body 4 and the chamfering surface There is no need to make a special distinction.
  • the bottom groove 51 centers the bottom center at a uniform interval from the bottom center 50 toward the side of the trunk or the lower end side of the chamfer so that the legs 52 are disposed in rotational symmetry about the central axis C. It may be disposed radially.
  • Example 1 Five containers 1 shown in FIG. 1 and FIG. 2 were prepared, and each was filled with carbonated water so that the pressure in the container was 0.24 MPa under a temperature condition of 22 ° C. and sealed.
  • the average height H0 from the ground portion 53 to the bottom center 50 of the leg 52 of the container 1 before filling and sealing with carbonated water is 3.40 mm, from the center of one side of the bottom to the center of the opposite side
  • the average of the width W0 was 61.40 mm, and the average of the diagonal width D0 at the bottom was 68.48 mm.
  • Example 2 Measure the height H2, the maximum width W2, and the maximum diagonal width D2 in the same manner as in Example 1 except that the container 1 filled with carbonated water and sealed is left standing in a constant temperature bath at a set temperature of 37 ° C. for 24 hours.
  • the height change amount [H2-H0], the width change rate [((W2-W0) / W0) ⁇ 100%], and the diagonal width change rate [((D2-D0) / D0) ⁇ 100%] were obtained. .
  • the results are shown in Table 1.
  • Comparative Example 1 The height H11 and the maximum width W11 after leaving the comparison container 101 in a constant temperature bath at a set temperature of 22 ° C. for 24 hours in the same manner as in Example 1 except that the comparison container 101 shown in FIG. 12 was used. Maximum diagonal width D11 is measured, height change amount [H11-H10], width change rate [((W11-W10) / W10) x 100%], diagonal width change rate [((D11-D10) / D10) x 100%] was determined. The results are shown in Table 1.
  • the container for comparison 101 is provided with the bottom groove 151 of the bottom portion 105 so as to extend from the center of the bottom portion 150 to a position corresponding to the corner of the cross section of the trunk portion 104, and the leg portion 152 is It is formed in the same manner as the container 1 except that it is provided at a position corresponding to the side surface of the cross section of the cross section 104.
  • the average height H10 of the comparison container 101 filled with carbonated water and sealed was 2.90 mm
  • the average of the width W10 was 62.05 mm
  • the average of the diagonal width D10 was 68.91 mm.
  • FIG. 13 is an explanatory view schematically showing the positional relationship between the bottom groove 51 and the leg 52 in the bottom 5 of the container 1 (a), and (b) the bottom groove 151 in the bottom 105 of the comparative container 101. It is explanatory drawing which showed the arrangement
  • FIG. 14 is a cross-sectional view (a) appearing on a cross-section of the container 1 taken along a vertical plane including the line AA 'in FIG. 13 and a vertical plane including the line B-O-B' in FIG. 6B shows a cross-sectional view (b) that appears in the cross-section of the container for comparison 101 cut away.
  • Legs 52 and 152 shown in the explanatory view schematically showing the positional relationship between the bottom groove and the leg at the bottom of FIG. 13 schematically show the position where the container protrudes downward. It does not specify the shape of Moreover, in the cross-sectional view shown in FIG. 14, the thickness of the container 1 and the container for comparison 101 is omitted.
  • the bottom groove 151 is formed to extend toward the lower end side of the corner of the body 104 having a substantially square cross section. Because of this, the lateral length of the arc shape in the vertical cross sectional shape of the groove bottom of the bottom portion 105 (the length from the center of the bottom along the direction orthogonal to the height direction to the end of the bottom groove) L2 is the container 1 It becomes longer than the horizontal length L1 of the arc shape. That is, the length from the start end to the end along the extension direction of the bottom groove 151 of the comparison container 101 is longer than the length from the start to the end along the extension direction of the container 1. The aspect ratio of the arc shape in the longitudinal cross-sectional shape of the groove bottom of the bottom portion 105 is increased.
  • Comparative Example 2 The height H12 and the maximum width W12 after leaving the comparison container 101 in a constant temperature bath at a set temperature of 37 ° C. for 24 hours in the same manner as in Example 2 except that the comparison container 101 shown in FIG. 12 is used. Maximum diagonal width D12 is measured, height change amount [H12-H10], width change rate [((W12-W10) / W10) x 100%], diagonal width change rate [(D12-D10) / D10) x 100%] was determined. The results are shown in Table 1.
  • Example 1 and Example 2 the height change amount and the width change rate when the inside of the container became positive pressure was small, and the diagonal width change rate was large. That is, it can be confirmed that the downward expansion of the bottom center of the bottom is effectively suppressed. Moreover, since the swelling of the side of a bottom part is suppressed effectively, it turns out that it is a container bottom part with which the polygonal shape of a container is easy to be maintained more. Furthermore, since the diagonal width of the bottom portion is expanded, it is understood that the position corresponding to the corner of the container body is expanded and the container bottom is a more easily maintainable polygonal shape of the container body.
  • the top 40A of the recessed groove 40 provided in the body 4 may be chamfered in a C-chamfered manner, and the top 40A of the recessed groove 40 further chamfers the R-chamfered apex in a straight line, etc. It can also be formed so as to include a plane that is flush with the side face of 4.
  • six similarly formed recessed grooves 40 are arranged at equal intervals along the height direction, but depending on the position where the recessed groove 40 is formed, for example, the recessed groove
  • the groove widths of 40 may be made different, or the intervals of arranging in parallel may be made different.
  • the number of the recessed groove portions 40 is not limited, and one or more recessed groove portions 40 may be formed in the body portion 4 as long as deformation due to expansion of the body portion 4 can be suppressed.
  • the interval at which the grooves 40 are arranged in parallel, the groove width of the grooves 40, the number of grooves 40, etc. depend on the volume, size, etc. of the container 1 so that deformation due to expansion of the trunk 4 can be suppressed. It can be changed as appropriate.
  • the container barrel portion when the inside of the container after filling and sealing the contents becomes positive pressure, the container barrel portion is sufficiently restrained from expanding by the internal pressure while having a rectangular cylindrical container shape.
  • the trunk portion 4 having the above-described recessed groove portion 40 has been described as a preferred example, but when the internal pressure is increased, the container shape having a polygonal cross section can be maintained. If it is, the shape in particular is not limited.
  • the bottom groove 51 is formed by a single groove having a predetermined width, but may be formed by a plurality of grooves having an arbitrary width.
  • the number of bottom grooves 51 of the bottom 5, the interval provided, etc. depend on the polygonal shape of the cross section of the trunk 4 and the capacity, size, etc. of the container 1 so that deformation due to the swelling of the bottom 5 can be suppressed. Can be changed as appropriate.
  • the cross section of the body 4 is formed into a polygonal rectangular tube shape, and the bottom 5 extends from the center 50 of the bottom toward the lower end side of the side of the body 4 and is longitudinally cut.
  • a plurality of bottom grooves 51 including groove bottoms formed in a circular arc shape whose surface shape is convex outward of the container, and a plurality of legs 52 separated by the bottom grooves 51 and protruding downward from the bottom center 50
  • the bottom grooves 51 are radially disposed about the center of the bottom 50 at equal intervals so that the legs 52 are disposed in rotational symmetry about the central axis C, the other details
  • the configuration of can be suitably changed without being limited to the embodiment described above. Further, the configurations of the details described in the above-described embodiment can be appropriately selected and combined.
  • the contents of the documents described in this specification and the Japanese application specification on which the Paris priority of the present application is based are all incorporated herein.
  • the container made of a synthetic resin according to the present invention can be used for applications such as for carbonated beverages in which the inside of the container after filling and sealing the contents has a positive pressure.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
PCT/JP2018/047338 2017-12-28 2018-12-21 合成樹脂製容器 Ceased WO2019131542A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-253840 2017-12-28
JP2017253840A JP6597770B2 (ja) 2017-12-28 2017-12-28 合成樹脂製容器

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WO2022103992A1 (en) * 2020-11-11 2022-05-19 Niagara Bottling, Llc Swirl bell bottle with wavy ribs
US11597558B2 (en) 2012-12-27 2023-03-07 Niagara Bottling, Llc Plastic container with strapped base
US11845581B2 (en) 2011-12-05 2023-12-19 Niagara Bottling, Llc Swirl bell bottle with wavy ribs
US11987416B2 (en) 2012-02-20 2024-05-21 Niagara Bottling, Llc Plastic container
US12246878B2 (en) 2011-12-05 2025-03-11 Niagara Bottling, Llc Plastic container with varying depth ribs
US12466602B2 (en) 2012-12-27 2025-11-11 Niagara Bottling, Llc Plastic container with strapped base

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JP7172035B2 (ja) * 2017-12-27 2022-11-16 東洋製罐株式会社 合成樹脂製容器
DE102019105005A1 (de) * 2019-02-27 2020-08-27 Krones Ag Kunststoffbehältnis mit Rillengeometrie
JP7493396B2 (ja) * 2020-06-29 2024-05-31 株式会社吉野工業所 耐圧ボトル
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JP2017501093A (ja) * 2013-12-26 2017-01-12 ナイアガラ・ボトリング・リミテツド・ライアビリテイー・カンパニー ストラップ状にされた底部を有するプラスチック容器
JP2018002293A (ja) * 2016-07-08 2018-01-11 東洋製罐株式会社 合成樹脂製容器
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JPH1142696A (ja) * 1997-07-29 1999-02-16 Kishimoto Akira 耐熱性延伸樹脂容器及びその製法
JP2008525278A (ja) * 2004-12-24 2008-07-17 アックア ミネラレ エッセ． ベネデット − ソシエタ ペル アチオニ プラスチックボトルベース
US20080302758A1 (en) * 2007-06-08 2008-12-11 Ravi Mody Container base
US20100072165A1 (en) * 2008-09-15 2010-03-25 Alexander Schau Plastic container
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11845581B2 (en) 2011-12-05 2023-12-19 Niagara Bottling, Llc Swirl bell bottle with wavy ribs
US12195225B2 (en) 2011-12-05 2025-01-14 Niagara Bottling, Llc Swirl bell bottle with wavy ribs
US12246878B2 (en) 2011-12-05 2025-03-11 Niagara Bottling, Llc Plastic container with varying depth ribs
US12545469B2 (en) 2011-12-05 2026-02-10 Niagara Bottling, Llc Swirl bell bottle with wavy ribs
US11987416B2 (en) 2012-02-20 2024-05-21 Niagara Bottling, Llc Plastic container
US11597558B2 (en) 2012-12-27 2023-03-07 Niagara Bottling, Llc Plastic container with strapped base
US12466602B2 (en) 2012-12-27 2025-11-11 Niagara Bottling, Llc Plastic container with strapped base
US12540001B2 (en) 2012-12-27 2026-02-03 Niagara Bottling, Llc Plastic container with strapped base
WO2022103992A1 (en) * 2020-11-11 2022-05-19 Niagara Bottling, Llc Swirl bell bottle with wavy ribs
GB2616161A (en) * 2020-11-11 2023-08-30 Niagara Bottling Llc Swirl bell bottle with wavy ribs
GB2616161B (en) * 2020-11-11 2024-11-27 Niagara Bottling Llc Swirl bell bottle with wavy ribs

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