EP0215881A1 - Ameliorations apportees a des recipients en plastique - Google Patents

Ameliorations apportees a des recipients en plastique

Info

Publication number
EP0215881A1
EP0215881A1 EP19860901954 EP86901954A EP0215881A1 EP 0215881 A1 EP0215881 A1 EP 0215881A1 EP 19860901954 EP19860901954 EP 19860901954 EP 86901954 A EP86901954 A EP 86901954A EP 0215881 A1 EP0215881 A1 EP 0215881A1
Authority
EP
European Patent Office
Prior art keywords
base portion
radius
container
base
feet
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.)
Withdrawn
Application number
EP19860901954
Other languages
German (de)
English (en)
Inventor
Aziz A. Meri-Mate Limited OKHAI
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.)
MERIMATE Ltd
Original Assignee
MERIMATE Ltd
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
Priority claimed from GB858507400A external-priority patent/GB8507400D0/en
Application filed by MERIMATE Ltd filed Critical MERIMATE Ltd
Publication of EP0215881A1 publication Critical patent/EP0215881A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the present invention relates to improved plastics containers and particularly to improvements in blow moulded plastic bottles for use as containers for pres ⁇ surised liquids such a carbonated beverages.
  • blow moulded bottles as containers for pressurised liquids such as carbonated soft drinks, beers, ciders etc. presents a number of problems.
  • the principal problem is that the internal pressure generated by such bottles tends to distort the thin, flexible walls of a blow moulded bottle. Th i s app I i es pa rt i cu la r ly to the base portion of the bottle.
  • a hemispherical base 2 ie. a base having its radius of curvature equal to the radius of the bottle
  • a num- ber of stabi lising feet 4 blown out therefrom This design also has a number of associated problems. Since the base is fully hemispherical, the feet have to be very deep to project below the bottom of the base, requiring a significant increase in the weight of the bottle and resulting in the effective base diameter d.. being very much less than the diameter of the bottle d ⁇ , leading to instabi lity.
  • the bottle is also liable to stress crack ⁇ ing owing to the depth of the feet 4 and also to the fact that the area of relatively weak unoriented plastics material around the centre of the base extends approxi ⁇ mately half way along the lower surface of the feet 4.
  • the present invention provides a plastics container comprising a generally cylindrical body portion and a generally convex base portion having a plurality of stabi lising feet projecting downwardly therefrom and spaced around the ci rcumference thereof, ' wherein the fundamental radius of curvature of said base portion is greater than the radius of said body portion, and further including means for .increasing the resistance of said base portion to deformation due to internal pressure, said means comprising spurs, formed by the bottom surfaces of said stabi lising feet, extending radially inwards towards the centre of said base portion and ter ⁇ minating at or adjacent to said centre and/or at least one f rus to-con i c a I portion superimposed upon said base portion.
  • the bottom surfaces of said spurs each comprise, in radial cross-section, a generally straight- line portion extending radially inwards and merging with said generally convex base portion adjacent the centre thereof .
  • said base portion in transverse cross-sec ion, comprises a generally convex wall and each of said frusto-conical portions comprises a pair of st ra i ght- I i ne portions, disposed symmetrically about the central axis of the container, superimposed upon said convex wall.
  • said base portion, in transverse cross-section is generally part-elliptical, having bottom arcuate portion of radius greater than the radius of said body portion and first and second peripheral arcuate portions of radius less than the radius of said body portion.
  • said base portion in transverse cross-section, is generally part-circular, comprising an arc of radius greater than the radius of said body portion.
  • the container further includes an upwardly concave portion located at the centre of said base portion.
  • the stabi lising feet are generally U-shape.d in section perpendicular to their radial axis and radiused into the base portion.
  • the number of said stabi lising feet is in the range 7 to 12. It is particularly preferred that the number of feet is an odd number.
  • Fig. 1 is a sectional view of a known blow moulded bott le
  • Fig. 2 is a plan view of the base of a container having an elliptical base
  • Fig. 3 is a section on line A-A of -Fig. 2;
  • Fig. 4 is a sectional perspective view on line B-B-B of Fig. 2;
  • Fig. 5 is a sectional view of a foot of the base; Figs. 6 and 7 are sections on lines C-C and D-D of
  • Figs. 8 to 12 show various embodiments of the inven ⁇ tion.
  • the base portion 8 is generally convex (ie. part-spherical or ellipsoid) and has a pluraltiy of stabi lisng feet 10 projecting downwardly therefrom and spaced around the circumference.
  • the shape of the base 8 is described by a segment of an arc having a radius of curvature (the fundamental radius) greater than the radius of the cylindrical body 6 of the bottle.
  • the radius and centre of curvature preferably vary towards the periphery of the bottle so that the wall of the base portion 8 is semi -e 11 i pt i ca I ; ie. it becomes vertical at the point 12 where the base portion 8 meets the body por ⁇ tion 10.
  • the base portion 8 of the bottle is not a full hemisphere.
  • the feet 10 need not be so deep as with a hemispherical base (the broken line 1-4 shows the line of an equivalent hemispher- • ical base for comparison, see also Fig. 1), reducing the weight of the bottle and increasing the strength of the feet. The area of unoriented material around the centre o-f the base is also decreased.
  • a further advantage associated with the relatively shallow feet 10 is that the point of contact of each foot 10 with a supporting surface may be made closer to the periphery of the base 8 so that the effective base dia ⁇ meter is increased. That, is the ratio d-,:d, (Fig. 3) is greater than d_. :d ? (Fig. 1), so that the stabi lity of the bottle is improved.
  • the internal pres ⁇ sure wi ll tend to cause the container to assume a spher- cal shape.
  • the shape of the base need not be perfectly spherical since the pressure on the sidewalls equalises the pressure on the base to a certain extent, so tending to resist deformation by the internal pressure.
  • the ratio of the fundamental radius of curvature of the base to the radius of the bottle is in the range 1.2 to 2.0.
  • the shape of the feet 10 themselves may vary but should generally be rounded to distribute the internal pressure as evenly as possible and, as explained above, it is desirable that the supporting point be as close as possible to the periphery of the base 8.
  • FIG. 4 A preferred form of the feet 10 which fulfi lls the above criteria is shown in the drawings and their overall shape is best seen in the perspective view of -Fig. 4, wherein the dashed and dotted lines 16 correspond to the line along which the right-hand foot 18 has been cut (ie. the radial axis) and dashed lines 20 correspond to the line through which the base has been cut at the left hand side (ie. the mid-point between adjacent feet) . These lines also correspond to lines 16 and 20 in Fig. 2.
  • Fig. 5 shows a foot 10 in section along its radial axis.
  • the foot 10 comprises a substantially straight portion 22 depending from point 12 and sloping slightly inwards from the vertical (angle E. , approxi ⁇ mately 5 ) .
  • the straight portion 22 is tangent to an arc 24 (centre of curvature 26) which extends to the point of contact with a supporting surface.
  • a second substantially straight portion 28 extends radially in ⁇ wardly and upwards from the horizontal (angle E ? , approxi ⁇ mately 6.5 ) .
  • the second straight portion 28 is connected to the base 8 by a concave portion 30 (centre of curvature 32) .
  • Figs. 6 and 7 are sectional views of the foot 10, perpendicular to the radial axis, on lines C-C and D-D respectively of Fig. 5.
  • the foot is generally U-shaped, comprising an arc 34 (Fig. 6, 42 in Fig. 7) having centre of curvature 36 (44) which is radiused into the base by concave portions 38 (46) about centres of curvature 40 (48).
  • the radius of curvature of the arc 34 reduces from the periphery of the base 8 towards the centre.
  • the use of a base portion which is less than sem i -c i rcu la r in section pro ⁇ vides advantages in relation to the stabi lity of the bottle and resistance to s ress-cracking around the feet, whi lst being reasonably resistan ' t to distortion.
  • the internal pressure on the bottle is great enough to distort the base, causing the centre portion of the base to expand downwards, and pushing the feet outwards.
  • the bottom of the base ill project below the feet so that the bottle wi ll rock on its base.
  • the configuration of the base can however, be modified in a number of ways to increase its resistance to distortion thereby allowing it to be used with liquids of higher pressure, as is ' shown in Figs. 8,- 9 and 10.
  • Fig. 8 shows a bottle base 50 which is generally elliptical in section as before, having a fundamental radius R1, which is greater than the radius R2 of the cylindrical body of the bottle, centred at 52, and- wherein the radius of the peripheral portions of the base 50, R3, is less than R2 and centred at points 54 and 56.
  • R1 the radius of the cylindrical body of the bottle
  • R3 the radius of the peripheral portions of the base 50, R3
  • superimposed upon the elliptical base are fi rst and second straigh -line portions 58 and 60 symmetrically disposed opposite one another on either side of the long axis of the bottle.
  • the base 50 comprises a first short peripheral arcuate portion PQ of radius R3, a first straight line portion QR, a bottom arcuate portion RS of radius R1, a second st ra i gh t- I i ne portion ST and a sec ⁇ ond short peripheral arcuate portion TU, radius R3.
  • the base portion 50 is therefore generally ellipsoidal with an upwardly diverging f rus to-coni ca I portion superimposed thereon.
  • the introduction of the frusto-conical portion causes the forces exerted on the base by the internal pressure to be redistributed in such a way as to reduce the tendency of the bottom portion of the base to distort downwards. It is also possible to use more than one frus o-conical portion (ie. further pairs of straight- line portions disposed around the section of the base) and to vary thei r length and position on the base.
  • the shape of the feet is not critical. As i llustrated, the feet 62 are generally simi lar to that shown in Fig. 5 and the same broad principles apply.
  • FIG. 9 An alternative means of strengthening the base is shown in Fig. 9 wherein the base portion 64 is elliptical in section (ie. R1 greater than R2; R3 less than R2) and the radially extending lower portion 66 of the foot 68 is extended further inwards towards the centre of the base.
  • the feet of the bottle form a series , if downwardly projecting "spurs" di ve rg i ng . rad i a I ly from the centre of the base, effectively bracing it against distortion.
  • the bottom portion 66 of the foot 68 comprises a straight-line portion tangent to the ar ⁇ cuate portion 70 and extending inwardly to merge with the bottom portion of the elliptical base.
  • This shape of foot can of course be varied provided that its inner- most termination is as close to the centre of the base as possi b le .
  • Fig. 10 shows a particularly preferred embodiment of the invention wherein the generally elliptical base portion 72 is provided both with a f rusto-conc i a I por- tion (defined by s t ra i gh - I i ne portions 74 and 76) and "spurs" formed by the feet 78 as described above. Again, the size, position and number of the frusto- conical portions and the particular shape of the feet may be varied.
  • Fig. 11 shows a further variation wherein the base portion 80 is part-spherical having radius R4 greater than R1 so that the base portion 80 comprises an arc which joins the vertical side walls 82 without the transitional arcuate portions of an elliptical base.
  • Such a base has not hitherto been considered suitable for use with the pressurised liquids, but the provision of feet having inwardly extending "spurs" as described above enhances its resistance to deformation sufficiently for it to be of practical use for such applications.
  • this base may also be provided with one or more frusto- conical sections as previously described (83. -Fig. 12 ) .
  • a further modification which may be incorporated into any of the embodiments hereinbefore described is an upwardly concave arcuate portion (84, shown in dotted lines in Fig. 12) located at the centre of the base.. This provides further strengthening of the base.
  • Fig. 2 of the drawings shows the base as having nine feet 10.
  • the number of ' feet may be varied, but it is preferred to have a large number (ie. in the range seven to twelve) of relatively small, closely spaced feet, since this provides a stronger structure than fewer, larger feet. An odd number of feet is also preferred since this tends to improve the stabi lity of the bottle if there are slight variations in the size of feet.
  • the base includes a f rus to-conc i ca I portion, fewer feet are requi red since the basic structure is inherently stronger. If "spurs" alone are used, a larger number of feet is preferable since they contribute directly to the strength of the base.
  • Preferred materials for the container are PET, PVC, polypropylene and polyethylene, including HDPE, LDPE and LLDPE.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

Un récipient en plastique, tel qu'une bouteille, comprend une partie de base (42) généralement convexe ayant une pluralité de pieds stabilisateurs (78) faisant saillie sur celle-ci, vers le bas, et espacés autour de sa circonférence. Le rayon fondamental (R1) de la partie de base (72) est plus grand que le rayon (R2) du corps du récipient, et sa résistance aux déformations dues à la pression interne est améliorée par des éperons formés par les surfaces inférieures (79) des pieds, s'étendant radialement vers le centre de la partie de base et se terminant au centre ou adjacents au centre, et/ou par une ou plusieurs parties tronconiques (74, 76) superposées à la partie de base (78).
EP19860901954 1985-03-21 1986-03-21 Ameliorations apportees a des recipients en plastique Withdrawn EP0215881A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB858507400A GB8507400D0 (en) 1985-03-21 1985-03-21 Plastic bottles
GB8507400 1985-03-21
GB8527952 1985-11-13
GB858527952A GB8527952D0 (en) 1985-03-21 1985-11-13 Plastic bottles

Publications (1)

Publication Number Publication Date
EP0215881A1 true EP0215881A1 (fr) 1987-04-01

Family

ID=26289011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860901954 Withdrawn EP0215881A1 (fr) 1985-03-21 1986-03-21 Ameliorations apportees a des recipients en plastique

Country Status (3)

Country Link
EP (1) EP0215881A1 (fr)
AU (1) AU5625486A (fr)
WO (1) WO1986005462A1 (fr)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8529234D0 (en) * 1985-11-27 1986-01-02 Mendle Bros Ltd Bottle
US5072841A (en) * 1986-02-14 1991-12-17 Norderney Investments Limited Plastic containers
USRE36639E (en) * 1986-02-14 2000-04-04 North American Container, Inc. Plastic container
ZA893987B (en) * 1988-06-17 1990-05-30 Hoover Universal Blow molded one-piece bottle and method for making same
US4865206A (en) * 1988-06-17 1989-09-12 Hoover Universal, Inc. Blow molded one-piece bottle
US4892205A (en) * 1988-07-15 1990-01-09 Hoover Universal, Inc. Concentric ribbed preform and bottle made from same
US4867323A (en) * 1988-07-15 1989-09-19 Hoover Universal, Inc. Blow molded bottle with improved self supporting base
GB8904417D0 (en) * 1989-02-27 1989-04-12 Mendle Limited A plastics bottle
AU738017B2 (en) * 1990-01-10 2001-09-06 International Packaging Technologies, Llc Plastic container for pressurized fluids
US4978015A (en) * 1990-01-10 1990-12-18 North American Container, Inc. Plastic container for pressurized fluids
WO1992000880A1 (fr) * 1990-07-09 1992-01-23 S.C.I. Operations Pty Limited Trading As Smorgon Plastics Recipient ameliore
US5024340A (en) * 1990-07-23 1991-06-18 Sewell Plastics, Inc. Wide stance footed bottle
US5139162A (en) * 1990-11-15 1992-08-18 Plastipak Packaging, Inc. Plastic blow molded freestanding container
US5615790A (en) 1990-11-15 1997-04-01 Plastipak Packaging, Inc. Plastic blow molded freestanding container
US5064080A (en) * 1990-11-15 1991-11-12 Plastipak Packaging, Inc. Plastic blow molded freestanding container
US5427258A (en) * 1992-04-09 1995-06-27 Continental Pet Technologies, Inc. Freestanding container with improved combination of properties
US5320230A (en) * 1992-06-08 1994-06-14 Yuan Fang Limited Base configuration for biaxial stretched blow molded pet containers
US5452815A (en) * 1992-06-08 1995-09-26 Yuan Fang Limited Base configuration for biaxial stretched blow molded pet containers
US5664695A (en) * 1995-01-06 1997-09-09 Plastipak Packaging, Inc. Plastic blow molded freestanding container
US6019236A (en) * 1997-09-10 2000-02-01 Plastipak Packaging, Inc. Plastic blow molded container having stable freestanding base
FR2772720B1 (fr) * 1997-12-23 2000-03-17 Sidel Sa Recipient en matiere thermoplastique a fond petaloide
US5988416A (en) 1998-07-10 1999-11-23 Crown Cork & Seal Technologies Corporation Footed container and base therefor
US6296471B1 (en) 1998-08-26 2001-10-02 Crown Cork & Seal Technologies Corporation Mold used to form a footed container and base therefor
US6085924A (en) * 1998-09-22 2000-07-11 Ball Corporation Plastic container for carbonated beverages
US7461756B2 (en) * 2005-08-08 2008-12-09 Plastipak Packaging, Inc. Plastic container having a freestanding, self-supporting base
FR2967975B1 (fr) * 2010-11-25 2012-12-28 Sidel Participations Fond de recipient petaloide combine
JP7300922B2 (ja) * 2019-07-29 2023-06-30 株式会社吉野工業所 耐圧ボトル

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU522123B2 (en) * 1979-01-10 1982-05-20 Yoshino Kogyosho Co., Ltd. Bottle blown with conical base
DE2920122A1 (de) * 1979-05-18 1980-11-20 Voith Fischer Kunststofftech Kunststoffbehaelter fuer unter erhoehtem druck stehende fluessigkeiten
US4249667A (en) * 1979-10-25 1981-02-10 The Continental Group, Inc. Plastic container with a generally hemispherical bottom wall having hollow legs projecting therefrom

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8605462A1 *

Also Published As

Publication number Publication date
AU5625486A (en) 1986-10-13
WO1986005462A1 (fr) 1986-09-25

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Inventor name: OKHAI, AZIZ, A.MERI-MATE LIMITED