EP0644121B1 - Bouteille axialement écrasable en matière plastique et outillage pour sa realisation - Google Patents

Bouteille axialement écrasable en matière plastique et outillage pour sa realisation Download PDF

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Publication number
EP0644121B1
EP0644121B1 EP94401999A EP94401999A EP0644121B1 EP 0644121 B1 EP0644121 B1 EP 0644121B1 EP 94401999 A EP94401999 A EP 94401999A EP 94401999 A EP94401999 A EP 94401999A EP 0644121 B1 EP0644121 B1 EP 0644121B1
Authority
EP
European Patent Office
Prior art keywords
bottle
corrugation
bottle according
depth
axis
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
EP94401999A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0644121A1 (fr
Inventor
Isabelle Fandeux
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
Priority claimed from FR9311225A external-priority patent/FR2710319B1/fr
Priority claimed from FR9401811A external-priority patent/FR2716161B1/fr
Application filed by Societe des Eaux Minerales dEvian SA SAEME filed Critical Societe des Eaux Minerales dEvian SA SAEME
Publication of EP0644121A1 publication Critical patent/EP0644121A1/fr
Application granted granted Critical
Publication of EP0644121B1 publication Critical patent/EP0644121B1/fr
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
    • B65D1/0292—Foldable bottles
    • 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
    • B65D2501/0036—Hollow circonferential ribs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S215/00—Bottles and jars
    • Y10S215/90—Collapsible wall structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00—Receptacles
    • Y10S220/906—Beverage can, i.e. beer, soda
    • Y10S220/907—Collapsible

Definitions

  • the invention relates to a bottle made of plastic which can be crushed by applying an axial force and which is therefore distinguished from bottles whose crushing results from a force transverse to their longitudinal axis as described in EP-408 929 or EP-528,754.
  • the invention also relates to a tool for producing such a bottle made of crushable plastic.
  • an object of the invention to provide such a plastic bottle which, having the same general shape and the same dimensions as the usual plastic bottles with transverse corrugations, can be used in a bottling plant without modification of the production and filling lines, can then be handled in the usual way, in particular to form palletized loads and stacked loads but which, however and unlike known bottles, can be easily crushed to form a residue of reduced volume when an axial force of low value is exerted, both at the start of the crushing phase and during the continuation of this phase.
  • an object of the invention to provide such a bottle which can be produced from different materials, simple or composite, multi-layer or compound such as polyolefins, polyesters or PVC and, in particular, polyethylene terephthalate (PET).
  • materials simple or composite, multi-layer or compound such as polyolefins, polyesters or PVC and, in particular, polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • an object of the invention to provide such a bottle, the cost of which, which is directly proportional to the quantity of material used, is entirely comparable to that of bottles known to allow its industrial exploitation.
  • An axially crushable plastic bottle according to the invention which comprises over at least most of its height transverse grooves, is characterized in that said grooves have a depth, that is to say a dimension in direction of the axis of the bottle, which varies cyclically over the periphery of said grooves between a maximum value and a minimum value.
  • the grooves have a depth which, when moving around the periphery of a groove around the longitudinal axis of the bottle, decreases from a maximum value until it reaches a minimum value. , then increases by this value minimum to the maximum value then decreases again to the minimum value, and so on, periodically or cyclically.
  • the shape defined above of a groove is the same for all the grooves of the side wall of the bottle, but is angularly offset by a value equal to ⁇ / n relative to the longitudinal axis of the bottle from one groove to the next, n being an integer.
  • the angle at the center of each arc formed on the bottom of a groove between a point of maximum depth and a point of minimum depth is equal to ⁇ / n, n being a whole.
  • the two ends of an arc of a corner at the center equal to ⁇ / n, between a point where the groove is of maximum depth and the next point where it is of minimum depth, are connected by a line segment .
  • the bottom radius of the groove and therefore the cross-sectional profile by a radial plane passing through the axis of the bottle, varies cyclically when moving around the periphery of the groove in correspondence with the depth thereof.
  • the plastic material constituting the bottle is polyethylene terephthalate (PET).
  • the PET bottle with a capacity of 1.5 liters, an empty weight of between 34 and 38 grams, with a constant wall thickness of between 0.17 and 0.35 mm and an empty height between 300-340 mm can be crushed by applying an axial force of less than 10 DaN.
  • the maximum depth of the grooves is of the order of 3 mm, the minimum depth of the order of 1.5 mm and the opening angle ( ⁇ ) of the groove equal to 70 °.
  • the maximum depth of the grooves is of the order of 3.86 mm, the minimum depth is of the order of 1.7 mm and the angle ( ⁇ ) of opening of the groove equal to 59.74 °.
  • plastics than PET can be used to make a bottle according to the invention, in particular simple or composite, multi-layer or compound materials, of the PVC type or of the polyolefin or polyesters type.
  • the invention can be implemented for bottles with a cylindrical body and a substantially circular cross section, whether or not including a gripping neck, without this indication of shape having, however, any limiting character whatsoever, the body of the bottle which may be of hexagonal or octagonal cross section or even substantially parallelepipedal, for example.
  • a tool for producing a bottle as defined above comprises a mold suitable for being used in a process for obtaining hollow bodies made of plastic material and which has, over at least most of its height, transverse undulations formed by alternating ribs and grooves, and is characterized, according to the invention, in that the ribs form a projection which, when moving around the periphery of the rib, varies cyclically between a minimum value and a maximum value.
  • the angle at the center of each rib arc between its end where the projection is minimum and that where the projection is maximum, is advantageously equal to ⁇ / n, where n is an integer.
  • the invention provides that the shape defined above of a rib is the same for all the ribs with an angular offset of a value equal to ⁇ / n relative to the longitudinal axis of the mold, when moving in the direction of said axis.
  • the radius of the apex of the rib varies cyclically when one moves around the periphery of the rib, in correspondence with the projection of said rib.
  • the grooves have a substantially constant depth over most of their contour and include from place to place folding caps formed projecting radially outward on the bottom of the grooves, these bending caps being regularly distributed and offset angularly around the axis of the bottle from one groove to the other.
  • these folding primers formed by protrusions from the bottom of the splines greatly facilitate the axial crushing of the bottle: the axial force that must be applied to the bottle to cause it to be crushed is less than 10 DaN, and the complete crushing of the bottle remains possible even if it includes a middle part of grip of reduced diameter or of particular shape.
  • the folding primers have, in the median planes of the grooves perpendicular to the axis of the bottle, an arcuate shape with a concavity turned towards the inside of the bottle.
  • the angular extent of each folding initiation around the axis of the bottle is between approximately 0.2 radians and 2 ⁇ / n, n being the number of folding initiations per groove.
  • the angular offset of the folding primers from one groove to the other is ⁇ / n, n being the number of folding primers per groove.
  • the invention also relates to a mold for the manufacture of an axially squeezable plastic bottle, characterized in that its internal surface comprises circular ribs corresponding to transverse grooves of the bottle to be produced and comprising recesses or cavities complementary to the primers folding described in the above.
  • FIG. 1 shows a bottle B according to the invention, of plastic material, advantageously of polyethylene terephthalate (PET) without this indication having, however, any limiting nature whatsoever, the bottle also being able to be made of a simple or composite, multi-layer or compound material, such as PVC or a polyolefin or a polyester.
  • the bottle B comprises a bottom F, a side wall P of generally cylindrical shape with two parts p 1 and p 2 separated by a grip constriction r , the upper part p 2 extending in the direction of the neck C by a smooth frustoconical part E or which, as a variant, may have reliefs constituting a mark or the like.
  • the neck C has a threaded neck G on which a screw cap V can be mounted.
  • the bottle B which is produced according to usual techniques for manufacturing plastic hollow bodies, for example injection-blowing, is shaped on its side wall P so that it can, after its contents have been emptied, be crushed by application of an axial force f of small value and leading to a residue R, FIG. 6, of volume significantly reduced compared to that of the bottle in its initial condition, full or empty.
  • the wall of the bottle of constant thickness, between 0.17 and 0.35 mm depending on the weight of a starting preform, is formed, in its zone constituted by the parts p 1 and p 2 , with corrugations or grooves, 10, comprising straight cylindrical parts or ribs 11 and parts in depression or grooves 12 ( Figures 1 and 5).
  • the ribs 11 While the ribs 11 have an outer surface 13 at constant distance d from the axis A of the bottle and are on a cylinder with a circular cross section of axis A, the grooves 12 have a depth, that is to say a dimension measured between the bottom 14 of the groove and the external surface of the cylinder defining the ribs 13, which varies when one moves along said grooves.
  • said depth varies around the periphery of each groove between a maximum value (a) and a minimum value (b), then from this minimum value again to the maximum value (a), ... etc, ( FIGS. 2, 3, 3A and 3B), this variation in depth being obtained, insofar as the thickness e of the side wall of the bottle is constant, by giving the corresponding rib of the mold in which the bottle is shaped, a variable distance to the axis of the mold when moving along said rib, as will be explained below.
  • each groove is periodic or cyclic when moving along said groove, that is to say that each groove arc, 20 1 , 20 2 , 20 3 , ... etc, extending between the successive ends 21, 22, 23, ... etc, where the groove is of smaller and greater depth, respectively, at an angle at the center equal to ⁇ / n, n being an integer.
  • each arc 20 corresponds to an angle at the center of 45 °, as well visible in Figures 2 and 3 which show two successive grooves 12 i and 12 i + 1 as they appear on the side wall of the bottle when one moves down along the axis A.
  • the shape of the grooves is the same, but the successive grooves are offset angularly by a value of ⁇ / n, here 45 °, relative to the longitudinal axis A of the bottle, the groove 12 i thus being of shallower depth (b) in the plane TT while the groove 12 i + 1 is of greater depth (a) in this same plane, which can also be translated by the fact that the shallower and deeper ends of the bottle grooves form a somewhat "helical" pattern around the axis of the bottle, as indicated by the dashed lines h 1 , h 2 , ... etc, of figure 1.
  • the angle ⁇ of opening of each groove is constant but the radius of the groove bottom, and therefore the profile in cross section through a radial plane passing through the axis A of the bottle shown in xx and in yy respectively for FIGS. 3A and 3B-, varies cyclically when one moves around the periphery of the groove, in correspondence with the depth of the latter.
  • the profile is as shown in FIG. 3A, that is to say with a curved bottom 30 with a relatively large radius connected to the adjacent ribs 13 by profiled parts 31 and 32 giving the cross section has a widely flared U shape, while at the right of the greatest groove depth, FIG. 3B, the cross section has a V shape, the faces 33 and 34 of which form the angle ⁇ and are connected by a curved bottom 35 with a relatively small radius.
  • each groove 12 varies according to a continuous curve when one moves around the periphery of the groove between the ends 21 and 22, 22 and 23, etc ... where the groove is of smaller depth then of greater depth, ... etc.
  • the successive ends 21 ', 22', 23 ', ... etc, where the groove is of smaller depth and greater depth, respectively, are connected by straight segments 24 1 , 24 2 , ... etc, each corresponding segment at an angle at the center equal to ⁇ / n (equal to 45 ° as in the previous embodiment), the grooves 12 i and 12 i + 1 here also being offset by 45 ° relative to the longitudinal axis A of the bottle when 'we move along the axis of the latter.
  • the bottle structure according to the invention makes it possible to crush it by an axial force of low value, less than 10 DaN, both at the start of the crushing phase and during the continuation of this phase, as shown by the curve 41 (FIG. 7) relating to a bottle according to the invention, while the curve 42 reflects the crushing force which constantly increases, over time, for a usual bottle.
  • APO denotes a bottle of the same general shape as that shown in FIG. 1, but which does not have the characteristics of l 'invention, and by USI a bottle of the same general shape but without shrinking r and which also does not have the characteristics of the invention.
  • the indication "shape 4" designates a bottle according to the invention, of the type of that shown in FIG. 1, the maximum throat depth (a) is 3 mm, the minimum depth (b) is 1.5 mm and for which the angle ⁇ is 70 °.
  • shape 4" The shape of the corrugations designated by the reference “shape 4" is the same as that defined above for Table I, that referenced "shape 6" designating grooves whose minimum depth is 1.7 mm, the maximum depth 3, 86 mm and whose angle ⁇ is 59.74 °.
  • a plastic bottle, which can be crushed, as defined above, is obtained by a process for manufacturing hollow bodies, for example extrusion blow molding or injection blow molding using a tool, in particular a shell mold, FIGS. 8 to 11.
  • the side wall 50 has ribs 51 1 , 51 2 on its internal face, 51 3 , 51 4 , ... interconnected by cylindrical parts with circular cross section 52 1 , 52 2 , 52 3 , ... etc. As shown in FIG.
  • each rib 51 is shaped to provide a projection which, when moving around the periphery of a rib, varies cyclically between a minimum value (m) and a maximum value (M), the angle at the center ⁇ of each rib arc between its end 53 (where the projection is minimum) and its end 54 (where the projection is maximum) being equal to ⁇ / n, where n is an integer.
  • the radius of the apex of the rib 51 and, consequently, the profile in cross section through a radial plane passing through the axis Z of the mold varies cyclically when moving around the periphery of the rib 51, in correspondence with the projection of said rib, the profile in line with the maximum projection (M) being as shown in FIG. 10 and that in line with the minimum projection (m) as shown in FIG. 11.
  • a rib 51 is the same for all the ribs of the side wall of the mold, but is angularly offset by a value equal to ⁇ / n relative to the longitudinal axis Z of the mold when moves in the direction of said axis.
  • the grooves 10 of the bottle have, as previously, a V-shaped cross section with apex rounded 56 oriented towards the inside of the bottle, the two straight branches 58 of the V being connected by arcs of a circle 60 to the cylindrical peripheral wall of the bottle and each groove 10 comprises folding caps 62 which are angularly distributed so uniform around the longitudinal axis 64 of the bottle and which protrude from the bottom of the grooves 10, towards the outside of the bottle, the grooves 10 being of constant depth outside the folding caps.
  • the folding primers 62 are angularly offset by an angle equal to ⁇ / n, n being the number of folding primers per groove.
  • This number n is typically between 3 and 20.
  • top lines 68 of the folding caps are inclined from top to bottom and from the inside to the outside.
  • a symmetrical orientation to that shown with respect to a perpendicular to the axis of the bottle is also possible.
  • the folding primers 62 have, in top view, not a curved or arcuate shape, but a very open V shape with rectilinear sides, the vertices of the V being understood in the planes 66 of symmetry of these primers passing through the axis 64 of the bottle.
  • Table III appended gives the results of comparative tests carried out between bottles known from the prior art and a bottle such as that of FIGS. 12 and 13, comprising four primers for folding by splines, the angular extent ⁇ of each initiation of folding being approximately 26 °, the angle ⁇ of inclination of the apex lines 38 relative to the axis of the bottle being 21 °, the radial extent ⁇ of the bending caps being approximately 1.4 mm ( the depth of the groove being 3 mm).
  • bottles according to the invention can be able to be manufactured, filled, capped, handled, transported and used like the bottles of the prior art although they can be easily crushed when empty to occupy a much lower volume after use.
  • the gain in volume after crushing can be quantified by the ratio of the number of crushed bottles and the number of identical bottles that are not crushed that a container of given shape and volume can contain.
  • this ratio varies between 2.5 and 4 depending on the volume and the shape of the container.

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  • 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)
EP94401999A 1993-09-21 1994-09-08 Bouteille axialement écrasable en matière plastique et outillage pour sa realisation Expired - Lifetime EP0644121B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9311225A FR2710319B1 (fr) 1993-09-21 1993-09-21 Bouteille en matière plastique écrasable et outillage pour sa réalisation.
FR9401811 1994-02-17
FR9311225 1994-02-17
FR9401811A FR2716161B1 (fr) 1994-02-17 1994-02-17 Bouteille axialement écrasable en matière plastique et moule de fabrication de cette bouteille.

Publications (2)

Publication Number Publication Date
EP0644121A1 EP0644121A1 (fr) 1995-03-22
EP0644121B1 true EP0644121B1 (fr) 1997-08-06

Family

ID=26230616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401999A Expired - Lifetime EP0644121B1 (fr) 1993-09-21 1994-09-08 Bouteille axialement écrasable en matière plastique et outillage pour sa realisation

Country Status (7)

Country Link
US (1) US5632397A (ja)
EP (1) EP0644121B1 (ja)
JP (1) JPH07172424A (ja)
AT (1) ATE156443T1 (ja)
CA (1) CA2131957A1 (ja)
DE (1) DE69404790T2 (ja)
ES (1) ES2108396T3 (ja)

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ATE156443T1 (de) 1997-08-15
DE69404790D1 (de) 1997-09-11
US5632397A (en) 1997-05-27
EP0644121A1 (fr) 1995-03-22
DE69404790T2 (de) 1998-03-19
CA2131957A1 (fr) 1995-03-22
JPH07172424A (ja) 1995-07-11
ES2108396T3 (es) 1997-12-16

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