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EP2084070B1 - Boden für einen durch blasen oder streckblasen eines vorformlings erhaltenen hohlkörper - Google Patents

Boden für einen durch blasen oder streckblasen eines vorformlings erhaltenen hohlkörper Download PDF

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Publication number
EP2084070B1
EP2084070B1 EP07803871A EP07803871A EP2084070B1 EP 2084070 B1 EP2084070 B1 EP 2084070B1 EP 07803871 A EP07803871 A EP 07803871A EP 07803871 A EP07803871 A EP 07803871A EP 2084070 B1 EP2084070 B1 EP 2084070B1
Authority
EP
European Patent Office
Prior art keywords
support surface
hollow
transverse support
transverse
body bottom
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.)
Not-in-force
Application number
EP07803871A
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English (en)
French (fr)
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EP2084070A1 (de
Inventor
Michel Boukobza
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.)
Sidel Participations SAS
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Sidel Participations SAS
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Publication date
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Publication of EP2084070A1 publication Critical patent/EP2084070A1/de
Application granted granted Critical
Publication of EP2084070B1 publication Critical patent/EP2084070B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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—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
    • 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

Definitions

  • the invention relates to the technical field of hollow bodies made of thermoplastic material, in particular containers such as pots or bottles.
  • the invention relates more particularly to hollow bodies obtained by blowing or stretching then blowing a preform injected with thermoplastic material (injection blow molding).
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PP polypropylene
  • PAN polyacrylonitrile
  • thermoplastic containers must have good resistance of their bottom.
  • the bi-oriented PET has good mechanical and thermal resistance. But, as has been said above, the bottom of the containers is much less stretched than the body of the containers, so that the bottom has mechanical and thermal resistance lower than those of the body.
  • the bottom of the container must withstand shocks, for example when the full container falls.
  • the container bottom must withstand the internal pressure, especially when the container contains a carbonated beverage.
  • An internal overpressure may result from an increase in the storage temperature of the full bottles and / or the withdrawal of the plastic material from these bottles, this withdrawal generally occurring within two or three weeks of their manufacture and filling.
  • the bottles are transported in palletized loads and stacked. So that, except for placement of inserts, bottoms of the bottles of the upper layers rest on the caps of the lower bottles and are subject to stresses of depression and punching.
  • the container bottom must resist creep.
  • the container as a whole, and in particular its bottom, must withstand the relatively severe thermal conditions encountered during hot filling or pasteurization.
  • the bottom When hot filling with a liquid at a temperature of at most 94 ° C, the bottom must have a relative aptitude for deformation. It is the same during the subsequent cooling, the bottom having to withstand the vacuum (vacuum compensation).
  • Pasteurization is carried out for certain flat liquids (non-carbonated fruit juices) or gaseous liquors (beer).
  • the liquid contained in the closed container may be carried for example at a temperature of between 60 and 80 ° C for about 20 minutes to 2 hours, the temperature being a function of the CO2 content.
  • the liquid to be pasteurized contains dissolved gas under pressure (carbonated beverage, beer)
  • the bottom material of the container must not only withstand the increase in volume of the hot liquid, but also the increase of the pressure of the hot gas.
  • the pasteurized liquid reduces volume, the bottom of the container must also withstand this constraint.
  • the bottom of the containers must sometimes withstand cleaning agents in the case of reusable containers.
  • Containers with a thick bottom are also known.
  • the so-called “champagne” funds offer the advantage of allowing a continuous annular support zone for the standing stored bottle, including a remarkably stable seat.
  • This solution is not satisfactory, the cost of the material forming the container being a preponderant part of the cost price.
  • the weight of a PET bottle with a capacity of 2 liters increased from 65 g to 52 g and there is a constant demand for bottles both light and resistant.
  • the background "champagne" can lose its shape under the action of temperature. Cracks may occur between areas of different thicknesses, specific means to be provided in the molds to cool faster thick areas.
  • the bottom wall is then generally convex outward and comprises feet, typically four to six feet formed by regularly distributed growths on the bottom, and separated two by two by a portion of the convex bottom wall.
  • These petaloid bottoms are widely used for containers containing carbonated beverages.
  • the radial recesses separating the feet absorb the forces due to the pressurization during filling and maintain the bearing surfaces of the feet in a plane substantially perpendicular to the axis of the container. This solution is not always satisfactory. Under the effect of internal pressure, the petaloid bottoms may burst. The petaloid bottoms can not always withstand the overpressure due to the increase in volume of the contents of the bottle, during a pasteurization.
  • the document FR 2,717,443 describes a bottle in which the ribs depart from the periphery of the bottom and end at the outer limit of a substantially flat annular zone surrounding an amorphous concave central portion.
  • the document FR 2,753,435 of the applicant describes a container whose bottom comprises an undrawn central portion and a peripheral portion connecting the central portion to the side wall of the container, the bottom being provided with ribs extending from the side wall to the theoretical extreme limit from the unstretched central part. This theoretical extreme limit takes into account the slight fluctuations in the shape and dimensions of the central part of the bottom (pellet), from one bottle to another of the same series. No rib ends in the amorphous part.
  • the aim of the invention is to provide a new bottle bottom structure whose set of individual characteristics makes it possible to obtain a resistance greater than that of most of the funds currently known, and enables it to recover "naturally" its shape after a constraint. (fall or other) having caused its deformation.
  • a bottom according to the invention will be more resistant than most previously known bottoms bottoms.
  • a bottom according to the invention can be made with a material thickness less than most funds previously known.
  • the invention also aims to provide a bottle having good resistance to hot filling and good resistance to pasteurization.
  • the bottom is in the form of a body of revolution about an axis substantially perpendicular to its transverse bearing surface.
  • the bottom has, in vertical radial section, between the outer edge and the transverse support surface, a substantially parabolic profile.
  • the bottom has a transverse bearing surface of continuous annular shape, no groove or notch opening into this seating surface.
  • the bottom presents first an annular step, then a concave profile connecting this step to the transverse central portion.
  • this bottom comprises reinforcement ribs having an outer edge coming close to the transverse bearing surface, these reinforcing ribs having an inner edge coming close to the transverse central portion, but without reaching this transverse central portion; the reinforcing ribs do not reach the transverse bearing surface.
  • the invention relates, according to a second aspect, to hollow bodies of thermoplastic material, in particular polyester such as PET, obtained by blow molding or stretch blow molding of a preform, these hollow bodies comprising a side wall and a bottom connected to this side wall. said bottom being as presented above.
  • the bottom 3 is in the form of a body of revolution about an axis 4 substantially perpendicular to its transverse support surface 5, which is provided essentially with notches 2 (ten notches in the example) near the its outer edge 6, and can be completed at its center by a structure with radial ribs 1.
  • the outer edge 6 is transverse and substantially corresponds to the junction between the bottom 3 and the side wall of the container (not shown). This outer edge 6 is placed at a height h6 relative to the transverse support surface 5 of the bottom 3 (and the bottle comprising the bottom 3, when the bottle is stored upright).
  • the bottom 3 has in vertical radial section a substantially parabolic profile 7.
  • this profile 7 is substantially tangential to a direction 8 perpendicular to the transverse bearing surface 5.
  • this profile 7 is substantially tangent to this transverse support surface 5. The profile 7 thus provides a solution of continuity, without breaking bending, between the side wall of the container (not shown) and the surface 5 of transverse support.
  • the bottom 3 has a transverse support surface 5 of annular and continuous shape. Starting from this annular surface and going towards the axis 4 of revolution, the bottom 3 has an annular step 9 of width (measured radially) substantially equal to the width of the annular surface 5 of transverse support. This annular step 9 allows deformation bottom 3 in the manner of a bellows, under the effect of an overpressure or a vacuum in the hollow body provided with such a bottom.
  • the bottom 3 Starting from this annular step 9 and going towards the axis 4 of revolution, the bottom 3 then has, in vertical radial section, a substantially parabolic profile 10 and then a transverse central portion 11.
  • the transverse central portion 11 is placed at a height h11 with respect to the transverse support surface 5, this height h11 being any relative to that h6 of the outer edge 6.
  • An axial pellet 12 protrudes into the transverse central portion 11, this pellet 12 axial projecting downwards, that is to say the outside of the container provided with the bottom 3.
  • These notches 2 extend radially. They comprise a bottom wall 20 and two lateral wings 21, 22. Each notch has a radial vertical plane of symmetry. The distal end portion 23 of these notches comes in the vicinity but does not reach the extreme edge 6 of the bottom 3. These notches and have an output close to the vertical but away from the joint plane. Preferably, the proximal end portion 24 of the notches comes close to the seat but does not open into this seat.
  • the width of the notches is typically between 2 and 20 millimeters. The depth of these notches varies according to the capacity of the bottle, and is typically 1.5 millimeters for a bottle of 0.5 liters (3 to 4 millimeters for a bottle of 1.5 liters).
  • the proximal end portion 24 of the notches comes in tangency of the seat without opening in this seat.
  • the reinforcing ribs 1 which, in some implementations can complete the notches will now be described.
  • reinforcing ribs 1 have an outer edge 13 coming close to the annular step 9 of the bottom 3, but without reaching this annular step 9.
  • these ribs 1 have an inner edge 14 coming close to the transverse central portion 11, but without reaching this transverse central portion 11.
  • Each rib 1 comprises a bottom wall 15 and a flange 16, 17 on either side of the bottom wall 15.
  • the bottom wall 15 is of decreasing width from the outer edge 13 to the inner edge 14 of the rib.
  • the bottom wall 15 of a rib does not have a constant curvature over the entire radial length of this rib.
  • the ribs 1 form a more acute angle with the vertical than in the vicinity of their inner edge 14.
  • Each rib 1 has a vertical plane of symmetry 18 radial.
  • the ribs 1 come to lean against a central chimney 19 in the center of which protrudes, downwards, the pellet 12, this central chimney 19 being limited upwards by the transverse central portion 11.
  • a bottom according to the invention makes it possible to obtain a resistance greater than that of most currently known funds.
  • a bottom according to the invention will be more resistant than most previously known bottoms bottoms.
  • a desired strength, a bottom according to the invention can be made with a material thickness less than most funds previously known.
  • a bottle comprising a bottom according to the invention has a good resistance to hot filling and good resistance to pasteurization.
  • the central chimney 19 is particularly well reinforced with respect to creep or slump by the presence of reinforcing ribs 1.
  • a bottle comprising a bottom according to the invention also has good impact resistance on the lower part of the side wall.
  • the presence of the notches reduces the risk of plastic deformation of the bottle in the connection area between the side wall of a container and its seat.
  • the bottom absorbs shocks perfectly and is able to recover "naturally" its initial shape after deformation.
  • the shape of the bottle bottom allows a reduction of the weight of material and this without weakening the seat or reduce the seating surface compared to conventional bottoms, while maintaining a good resistance to hot filling (vacuum effects when cooling) and shocks.
  • a conventional hot-fill bottle of 32 g can be made with 26 g of PET only, using a bottom according to the invention.
  • the ribs 1 of reinforcement are five in number and substantially identical and equidistant.
  • the reinforcing ribs are more or less numerous, in particular to take into account the diameter of the bottom.
  • the reinforcing ribs may be of different sizes, a first series may have a bottom wall narrower than the bottom wall of a second series of ribs.
  • the notches are ten in number and substantially identical and equidistant.
  • the ribs extending along radii disposed at mid-distances from adjacent slot locations. By this arrangement, the ribs and notches cooperate best with the reinforcement of the bottom of the hollow body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Confectionery (AREA)

Claims (15)

  1. Boden (3) eines Hohlkörpers, der durch Blasen oder Blasziehen eines Vorformlings aus thermoplastischem Material erhalten wird, wobei dieser Boden (3) eine transversale Abstützoberfläche (5) und beiderseits dieser transversalen Abstützoberfläche (5) enthält:
    - einen transversalen äußeren Rand (6);
    - eine konkave Innenwand mit einem transversalen mittleren Teil (11), der eine Tablette (12) aus einem Material mit geringer Kristallisation enthält, wobei diese Tablette (12) dem Einspritzpunkt des Vorformlings entspricht; wobei der Boden (3) eine Umfangszone um die transversale Abstützoberfläche aufweist, die mit Kerben (2) versehen ist, wovon sich der distale Endabschnitt (23) in der Umgebung des äußeren Randes (6) des Bodens (3) befindet, ohne ihn zu erreichen, dadurch gekennzeichnet, dass der proximale Endabschnitt (24) der Kerben zu der transversalen Abstützoberfläche (5) tangential ist.
  2. Hohlkörperboden nach Anspruch 1, dadurch gekennzeichnet, dass die Kerben (2) eine Bodenwand (20) und zwei seitliche Flügel (21, 22) aufweisen und eine Symmetrieebene besitzen.
  3. Hohlkörperboden nach Anspruch 1, dadurch gekennzeichnet, dass der proximale Endabschnitt (24) der Kerben nicht in die transversale Abstützoberfläche (5) mündet.
  4. Hohlkörperboden nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Breite der Kerben im Bereich von etwa 2 bis 20 Millimetern liegt.
  5. Hohlkörperboden nach Anspruch 4, dadurch gekennzeichnet, dass die Tiefe dieser Kerben im Bereich von etwa 1 bis 5 Millimetern liegt.
  6. Hohlkörperboden nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Tablette (12) aus einnem Material mit geringer Kristallisation im transversalen mittleren Teil (11) nach außen vorsteht.
  7. Hohlkörperboden nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der äußere Rand (6) auf einer Höhe h6 in Bezug auf die transversale Abstützoberfläche (5) angeordnet ist, wobei der transversale mittlere Teil (11) auf einer Höhe h11 in Bezug auf die transversale Abstützobexfläche (5) angeordnet ist.
  8. Hohlkörperboden nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er die Form eines Körpers aufweist, der um eine Achse (4), die zu seiner transversalen Abstützoberfläche (5) im Wesentlichen senkrecht ist, rotationssymmetrisch ist.
  9. Hohlkörperboden nach Anspruch 8, dadurch gekennzeichnet, dass er im vertikalen radialen Schnitt zwischen dem äußeren Rand (6) und der transversalen Abstützoberfläche (5) ein Profil besitzt, das:
    - in der Umgebung der Außenkante (6) zu einer Richtung (8) senkrecht zu der transversalen Abstützoberfläche (5) im Wesentlichen tangential ist,
    - in der Umgebung der transversalen Abstützoberfläche (5) zu dieser transversalen Abstützoberfläche im Wesentlichen tangential ist.
  10. Hohlkörperboden nach Anspruch 9, dadurch gekennzeichnet, dass er im vertikalen radialen Schnitt zwischen der Außenkante (6) und der transversalen Abstützoberfläche (5) ein im Wesentlichen parabolisches Profil (7) aufweist.
  11. Hohlkörperboden nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass er eine transversale Abstützoberfläche (5) mit einer ununterbrochenen Ringform aufweist.
  12. Hohlkörperboden nach Anspruch 11, dadurch gekennzeichnet, dass der Boden (2) als Teil dieser transversalen Abstützoberfläche (5) und in Richtung zu der Rotationssymmetrieachse (4) zunächst einen ringförmigen Verlauf (9) und dann ein parabolisches Profil (10), das diesen ringförmigen Verlauf (9) mit dem transversalen Mittelteil (11) verbindet, aufweist.
  13. Hohlkörperboden nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass er Verstärkungsrippen (1) aufweist, die eine Außenkante (13) besitzen, die sich in der Umgebung der transversalen Abstützoberfläche (5) befindet, wobei diese Verstärkungsrippen (1) eine Innenkante (14) besitzen, die sich in der Umgebung des transversalen Mittelteils (11) befindet, jedoch ohne diesen transversalen Mittelteil (11) zu erreichen.
  14. Hohlkörperboden nach Anspruch 13, dadurch gekennzeichnet, dass die Verstärkungsrippen (1) die transversale Abstützoberfläche (5) nicht erreichen.
  15. Hohlkörper aus thermoplastischem Material, insbesondere Polyester wie etwa PET, der durch Blasen oder Blasziehen eines Vorformlings erhalten wird, wobei dieser Hohlkörper eine Seitenwand und einen mit dieser Seitenwand verbundenen Boden aufweist, dadurch gekennzeichnet, dass der Boden wie in einem der vorhergehenden Ansprüche definiert beschaffen ist.
EP07803871A 2006-08-08 2007-07-13 Boden für einen durch blasen oder streckblasen eines vorformlings erhaltenen hohlkörper Not-in-force EP2084070B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0607214A FR2904810A1 (fr) 2006-08-08 2006-08-08 Fond de corps creux obtenus par soufflage ou etirage soufflage d'une preforme en materiau thermoplastique, corps creux comprenant un tel fond
PCT/FR2007/001209 WO2008017748A1 (fr) 2006-08-08 2007-07-13 Fond de corps creux obtenu par soufflage ou etirage-soufflage d' une preforme

Publications (2)

Publication Number Publication Date
EP2084070A1 EP2084070A1 (de) 2009-08-05
EP2084070B1 true EP2084070B1 (de) 2010-12-22

Family

ID=37806685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07803871A Not-in-force EP2084070B1 (de) 2006-08-08 2007-07-13 Boden für einen durch blasen oder streckblasen eines vorformlings erhaltenen hohlkörper

Country Status (8)

Country Link
EP (1) EP2084070B1 (de)
JP (1) JP2010500242A (de)
CN (1) CN101522533A (de)
AT (1) ATE492477T1 (de)
DE (1) DE602007011484D1 (de)
FR (1) FR2904810A1 (de)
MX (1) MX2009001357A (de)
WO (1) WO2008017748A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011084315A (ja) * 2009-10-16 2011-04-28 Coca Cola Co:The プラスチックボトル
GB201106668D0 (en) * 2011-04-20 2011-06-01 Britvic Soft Drinks Ltd An improved base cup
JP6537773B2 (ja) * 2014-02-28 2019-07-03 ザ コカ・コーラ カンパニーＴｈｅ Ｃｏｃａ‐Ｃｏｌａ Ｃｏｍｐａｎｙ プラスチックボトル
JP2015199521A (ja) * 2014-04-08 2015-11-12 大日本印刷株式会社 ブロー成形プラスチックボトル
JP7173435B2 (ja) * 2018-10-16 2022-11-16 大日本印刷株式会社 プラスチックボトル
JP7519024B2 (ja) * 2020-02-04 2024-07-19 大日本印刷株式会社 プラスチックボトル

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Publication number Priority date Publication date Assignee Title
US4108324A (en) * 1977-05-23 1978-08-22 The Continental Group, Inc. Ribbed bottom structure for plastic container
US4520936A (en) * 1982-05-20 1985-06-04 Polybottle Blow moulded plastic containers
JPS6076613U (ja) * 1983-10-31 1985-05-29 日精エー・エス・ビー機械株式会社 耐熱性合成樹脂びん
US5503283A (en) * 1994-11-14 1996-04-02 Graham Packaging Corporation Blow-molded container base structure
JP3466746B2 (ja) * 1994-11-25 2003-11-17 株式会社吉野工業所 ポリエステル樹脂製容器の成形方法
JP2000128140A (ja) * 1998-10-20 2000-05-09 Aoki Technical Laboratory Inc ポリエステル樹脂による耐熱性包装用容器
US6065624A (en) * 1998-10-29 2000-05-23 Plastipak Packaging, Inc. Plastic blow molded water bottle
CN1170737C (zh) * 1999-02-27 2004-10-13 株式会社吉野工业所 合成树脂制薄壁容器
JP4099923B2 (ja) * 1999-02-27 2008-06-11 株式会社吉野工業所 薄肉ブローボトル
FR2822804B1 (fr) * 2001-04-03 2004-06-04 Sidel Sa Recipient, notamment bouteille, en matiere thermoplastique dont le fond comporte une empreinte en croix
JP4314794B2 (ja) * 2002-08-20 2009-08-19 東洋製罐株式会社 二軸延伸ポリエステル容器の製造方法
JP4178531B2 (ja) * 2002-09-30 2008-11-12 株式会社吉野工業所 合成樹脂製壜容器の底部構造

Also Published As

Publication number Publication date
WO2008017748A1 (fr) 2008-02-14
CN101522533A (zh) 2009-09-02
EP2084070A1 (de) 2009-08-05
ATE492477T1 (de) 2011-01-15
FR2904810A1 (fr) 2008-02-15
JP2010500242A (ja) 2010-01-07
MX2009001357A (es) 2009-06-30
DE602007011484D1 (de) 2011-02-03

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