EP0673840B1 - Geformte Flasche aus Kunststoff und Formwerkzeug dafür - Google Patents

Geformte Flasche aus Kunststoff und Formwerkzeug dafür Download PDF

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Publication number
EP0673840B1
EP0673840B1 EP95400525A EP95400525A EP0673840B1 EP 0673840 B1 EP0673840 B1 EP 0673840B1 EP 95400525 A EP95400525 A EP 95400525A EP 95400525 A EP95400525 A EP 95400525A EP 0673840 B1 EP0673840 B1 EP 0673840B1
Authority
EP
European Patent Office
Prior art keywords
bottle
convex
concave
bottle according
annular surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95400525A
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English (en)
French (fr)
Other versions
EP0673840A1 (de
Inventor
Alain Colloud
Jean-Marie Petre
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.)
Societe des Eaux Minerales dEvian SA SAEME
Original Assignee
Societe des Eaux Minerales dEvian SA SAEME
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societe des Eaux Minerales dEvian SA SAEME filed Critical Societe des Eaux Minerales dEvian SA SAEME
Publication of EP0673840A1 publication Critical patent/EP0673840A1/de
Application granted granted Critical
Publication of EP0673840B1 publication Critical patent/EP0673840B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B65D1/0284—Bottom construction having a discontinuous contact surface, e.g. discrete feet
    • 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
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
    • B65D2501/0027—Hollow longitudinal ribs
    • 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
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0081—Bottles of non-circular cross-section

Definitions

  • the invention relates to a molded plastic bottle, intended in particular to contain still or non-carbonated water, or another non-carbonated liquid. It also relates to a mold for manufacturing this bottle.
  • Bottles of this type are made of a plastic material such as for example PET (polyethylene terephthalate), PVC (polyvinyl chloride) or the like, by well-known injection-blow molding or extrusion blow molding techniques . They generally include a neck intended to receive a tight closure cap, a cylindrical wall with transverse grooves and a bottom whose shape is designed to give it a certain mechanical resistance.
  • PET polyethylene terephthalate
  • PVC polyvinyl chloride
  • bottles of this type are currently packaged and transported in stacked and palletized loads, so that the bottoms of the bottles of the upper layers of a load rest on the caps of the bottles of the lower layers and are subjected by them to sinking and punching constraints, which can result in ruptures or permanent deformation of the bottoms, by inclinations of the bottles in the load and by defects in the stability of the palletized loads.
  • the object of the invention is in particular to avoid or at least reduce these drawbacks.
  • It relates to a molded plastic bottle whose bottom has improved stability and resistance to sinking.
  • a molded plastic bottle comprising a neck intended to receive a stopper, a substantially cylindrical side wall and a bottom formed with a concave reentrant central part and a convex peripheral surface which comprises radial grooves and which is connected to the concave central part of the bottom by a substantially planar annular surface, the bottoms of the radial grooves being connected substantially tangentially to said planar annular surface.
  • the curvature of a surface is always defined from the inside towards the outside of the bottle, a concave surface therefore having its concavity turned towards the outside of the bottle, a convex surface having its convexity turned towards the outside of the bottle.
  • a bottom of the bottle having the configuration defined above has a resistance to internal overpressures and to punching stresses, as well as a stability, notably superior to what could be obtained in the prior art.
  • the radial width of said planar annular surface is greater than the radius of the concave central part of the bottom of the bottle, and the diameter of this concave central part of the bottom is less than the diameter of the stopper provided on the neck of the bottle.
  • the convex peripheral surface of the bottom is connected to the flat annular surface by a concave annular surface, and to the side wall of the bottle by a convex cylindrical surface whose generator is an arc of circle with a large radius of curvature.
  • the bottoms of the radial grooves formed in the convex peripheral surface are tangentially connected to the connection surface between this planar annular surface and said convex peripheral surface.
  • the bottoms of the radial grooves are connected to the wall of the bottle by concave surfaces.
  • this form of bottom of a molded plastic bottle makes it possible to improve by a factor of 1.5 to 2 the mechanical resistance to sinking and to internal overpressure, and the invention is applicable to bottles with a bottom circular or of another shape, for example substantially rectangular or square, polygonal or other.
  • the invention also provides a mold for manufacturing a bottle of the aforementioned type, this mold comprising a bottom wall formed with a protruding or convex central surface, a concave peripheral surface comprising radial ribs, and a substantially planar annular surface connecting the central surface to the concave peripheral surface, the tops of the radial ribs being connected substantially tangentially to said planar annular surface.
  • the radial width of the planar annular surface of the bottom of the mold is greater than the radius of the projecting central surface of the bottom of the mold.
  • the characteristics of the bottom of the bottle are found, with a shape inversion for the curvatures, on the bottom of the mold.
  • the bottle 10 of FIG. 1 intended to contain still or non-carbonated mineral water, is of conventional shape and is made of a conventional material such as PET (polyethylene terephthalate) by injection-blowing or extrusion -blowing.
  • PET polyethylene terephthalate
  • This bottle essentially comprises a threaded neck 12 intended to receive a screw cap 14 for sealing, a frustoconical upper part 16 connecting the neck 12 to a cylindrical side wall 18 of circular section, and a bottom 20, the cylindrical side wall 18 of the bottle being formed with transverse grooves 22 for stiffening and with a grip neck 24 provided substantially at mid-height.
  • the bottom 20 of the bottle (FIG. 2) has a circular contour and includes a re-entrant central part 26 of concave shape (with a concavity turned towards the outside of the bottle as indicated above) which is connected to the side wall 18 of the bottle by, successively, a flat annular surface 28 and by a convex peripheral surface 30 which forms a bearing surface of the bottle on any support 32, the bottom of the bottle further comprising a concave annular surface 34 of connection between the planar annular surface 28 and the convex peripheral surface 30, and a convex cylindrical surface 36 for connection between said convex peripheral surface 30 and the cylindrical wall 18 of the bottle.
  • Radial grooves 38 are formed in said convex peripheral surface 30, these grooves (which are grooves on the outside of the bottle and which form ribs projecting inside the bottle) being regularly distributed over the periphery of the convex surface 30, their number being between 6 and 20 and preferably being 9, 10 or 11.
  • the bottom profile of the bottle in axial section can be defined as follows, with reference to FIG. 2: the convex cylindrical surface 36 which connects the straight cylindrical wall 18 of the bottle to the convex surface 30 of support on a support, has a generatrix in an arc of a circle whose radius of curvature R1 is relatively large, for example of the order 90 mm when the radius of the cross section of the cylindrical wall 18 is of the order of 45 mm.
  • the profile of the convex surface 30 is an arc of a circle of radius R2, for example of the order of 7 mm in the hypothesis mentioned above, which is tangentially connected to the arc of a circle of radius R1 defining the surface 36 .
  • the circular arc of radius R2 defining the profile of the convex surface 30 is tangentially connected to a circular arc of radius R3 defining the profile of the concave annular surface 34, this radius R3 being of the order of 20 mm in l hypothesis mentioned above.
  • the circular arc of radius R3 defining the profile of the surface 34 is tangentially connected to the planar annular surface 28 which extends perpendicular to the longitudinal axis 40 of the bottle, the distance d between this planar annular surface 28 and the transverse plane tangent to the convex surface 30 being of the order of 3 to 4 mm in the hypothesis mentioned above.
  • the concave central portion 26 of the bottom is defined, in axial section, by a circular arc of radius R4 which is of the order of 9 mm in the hypothesis mentioned above, this concave circular arc of radius R4 being connected to the planar annular surface 28 by a convex annular surface 42 whose profile in axial section is defined by an arc of a circle of radius R5 having a value of the order of 5 mm in the same hypothesis as above.
  • Each radial groove 38 has a V cross section (FIG. 3) with a rounded bottom 44, the side walls 46 of each groove forming an angle between them of the order of 70 ° in the hypothesis mentioned above and being connected to the convex surface 30 by rounded 48 with small radius of curvature (about 1 mm in the hypothesis mentioned above).
  • the number of radial grooves 38 being between 6 and 20, the angle at the center a between the axes of two consecutive grooves is between 60 ° and 18 °.
  • each radial rib can be defined (FIG. 2) by a convex arc of radius R6 tangentially connected to the planar annular surface 28 by a concave arc of radius R7 and connected to the cylindrical surface 36 by a concave circular arc of radius R8 and a convex circular arc of radius R9, the circular arc of radius R9 being tangentially connected to the circular arc of radius R1 of the surface 36 and to the circular arc of radius R8, the latter being itself tangentially connected to the arc of a circle of radius R6.
  • each radial rib is tangentially connected to the planar annular surface 28 of the bottom of the bottle and to the concave annular surface 34 for connection between this planar annular surface 28 and the convex surface 30 bearing on a support 32.
  • the radius R6 can be of the order of 5 mm, the radius R7 of the order of 45 mm, the radius R8 of the order of 5.5 mm and the radius R9 of around 1.5 mm.
  • the concave central part 26 of the bottom of the bottle has a diameter which is considerably less than that of the stopper 14 of the bottle (for example of the order of 18-20 mm when the stopper has a diameter of around 30 mm) and is connected to the flat annular surface 28 whose radial extent or width is advantageously greater than the radius of the concave central part 26 of the bottom.
  • the holding of the bottle during storage is also improved, no deformation in heeling (inclination relative to the vertical) being observed after seven days of storage at 40 ° C.
  • the bottle has a substantially rectangular section with convex curved sides and its bottom 20 has a substantially rectangular curvilinear outline, defined by two large convex sides 50 and two small convex sides 52, connected by rounded or convex arcs of a circle 54.
  • the bottom 20 comprises a concave central reentrant part 26, connected by a planar annular surface 28 to a peripheral surface convex 30 bearing on a support surface, and radial ribs 38 formed in this convex surface 30 and regularly distributed.
  • radial grooves 38 are formed along the diagonals 56 of the bottom 20.
  • the number of grooves is advantageously between 12 and 16 (it is 14 in the example shown), and may vary between 8 or 10 and 20 depending on the shape and dimensions of the bottom.
  • FIG. 6 schematically shows a partial view in axial section of a mold for manufacturing a bottle according to the invention, such as that of FIGS. 1 to 3.
  • the mold 60 comprises a bottom wall 62, the internal face of which comprises a projecting central surface 64 of convex shape, a concave peripheral surface 66 comprising regularly distributed radial ribs 68, and a substantially planar annular surface 70 which connects the convex central surface 64 to the concave peripheral surface 66, the latter being connected to the internal peripheral surface 72 of the mold.
  • the shapes of the internal face of the bottom of the mold correspond to those of the bottom of the bottle of FIGS. 1 to 3, with an inversion for the curvatures, the concave surfaces of the bottom of the mold corresponding to convex surfaces of the bottom of the bottle, and vice versa, and the radial ribs 68 of the bottom of the mold corresponding to the radial grooves 38 of the bottom of the bottle.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Claims (15)

  1. Geformte Flasche aus Kunststoff, die einen zur Aufnahme eines Verschlusses (14) dienenden Hals (12), eine im wesentlichen zylindrische Seitenwand (18) und einen Boden (20) aufweist, der mit einem einspringenden oder konkaven zentralen Teil (26) und einer konvexen Umfangsfläche (30) geformt ist, die radiale Nuten (38) aufweist und an den konkaven zentralen Teil (26) des Bodens durch eine im wesentlichen ebene ringförmige Fläche (28) angeschlossen ist, wobei die Böden (44) der radialen Nuten (38) im wesentlichen tangential an diese ebene ringförmige Fläche (28) angeschlossen sind.
  2. Flasche nach Anspruch 1, dadurch gekennzeichnet, daß die radiale Breite dieser ebenen ringförmigen Fläche (28) größer als der Radius des konkaven zentralen Teils (26) des Bodens ist.
  3. Flasche nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Durchmesser des konkaven zentralen Teils (26) des Bodens kleiner als der Durchmesser des auf den Hals der Flasche aufschraubbaren Verschlusses (14) ist.
  4. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die konvexe Umfangsfläche (30) des Bodens mit der ebenen ringförmigen Fläche (28) durch eine konkave ringförmige Fläche (34) verbunden ist.
  5. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die konvexe Umfangsfläche (30) des Bodens mit der Seitenwand (18) durch eine konvexe zylindrische Fläche (36) verbunden ist, deren Erzeugende ein Kreisbogen mit großem Krümmungsradius ist.
  6. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Böden (44) der in der konvexen Umfangsfläche (30) geformten radialen Nuten (38) tangential an die Verbindungsfläche (34) zwischen der ebenen ringförmigen Fläche (28) des Bodens und der konvexen Umfangsfläche (30) angeschlossen sind.
  7. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Böden (44) der radialen Nuten (38) an die Seitenwand (18, 36) der Flasche durch konvexe und dann konkave Flächen angeschlossen sind.
  8. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die radialen Nuten (38) einen V-förmigen Querschnitt aufweisen.
  9. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Profil des Bodens (44) jeder radialen Nut (38) einen konvexen Kreisbogen aufweist, der durch einen konkaven Kreisbogen mit der ebenen ringförmigen Fläche (28) des Bodens der Flasche und durch einen konvexen und dann einen konkaven Kreisbogen mit der Seitenwand der Flasche verbunden ist.
  10. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ihr Boden (20) einen kreisförmigen Umriß hat und die Anzahl von radialen Nuten (38) 6 bis 20 und insbesondere 9, 10 oder 11 beträgt.
  11. Flasche nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß ihr Boden (20) einen im wesentlichen polygonalen, beispielsweise quadratischen oder rechteckigen Umriß hat und regelmäßig verteilte radiale Nuten (38) aufweist.
  12. Flasche nach Anspruch 11, dadurch gekennzeichnet, daß sich radiale Nuten (38) längs der Diagonalen (56) des Bodens erstrecken.
  13. Flasche nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die Anzahl von radialen Nuten (38) 8 oder 10 bis 20, insbesondere 12 bis 16 beträgt.
  14. Flasche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die ebene ringförmige Fläche (28) im vollen Zustand der Flasche im wesentlichen im selben axialen Abstand (d) vom Boden der konvexen Umfangsfläche (30) wie im leeren Zustand der Flasche bleibt.
  15. Form zur Herstellung einer Flasche nach einem der vorhergehenden Ansprüche, die eine Bodenwand (62) aufweist, die mit einer vorspringenden oder konvexen zentralen Fläche (64), mit einer radiale Rippen (68) aufweisenden konkaven Umfangsfläche (66) und mit einer ebenen ringförmigen Fläche (70) geformt ist, die die zentrale Fläche (64) mit der konkaven Umfangsfläche (66) verbindet, wobei die Scheitel der radialen Rippen (68) im wesentlichen tangential an diese ebene ringförmige Fläche (70) angeschlossen sind.
EP95400525A 1994-03-16 1995-03-13 Geformte Flasche aus Kunststoff und Formwerkzeug dafür Expired - Lifetime EP0673840B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403045 1994-03-16
FR9403045A FR2717443B1 (fr) 1994-03-16 1994-03-16 Bouteille moulée en matière plastique.

Publications (2)

Publication Number Publication Date
EP0673840A1 EP0673840A1 (de) 1995-09-27
EP0673840B1 true EP0673840B1 (de) 1997-05-21

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EP95400525A Expired - Lifetime EP0673840B1 (de) 1994-03-16 1995-03-13 Geformte Flasche aus Kunststoff und Formwerkzeug dafür

Country Status (8)

Country Link
US (1) US5713480A (de)
EP (1) EP0673840B1 (de)
JP (1) JPH09510168A (de)
AT (1) ATE153295T1 (de)
CA (1) CA2184390A1 (de)
DE (1) DE69500307T2 (de)
FR (1) FR2717443B1 (de)
WO (1) WO1995025041A1 (de)

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ATE153295T1 (de) 1997-06-15
DE69500307D1 (de) 1997-06-26
JPH09510168A (ja) 1997-10-14
WO1995025041A1 (fr) 1995-09-21
EP0673840A1 (de) 1995-09-27
DE69500307T2 (de) 1997-12-18
FR2717443B1 (fr) 1996-04-19
FR2717443A1 (fr) 1995-09-22
CA2184390A1 (fr) 1995-09-21
US5713480A (en) 1998-02-03

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