EP0029039B1 - Recipient a parois souples pour produits sous pression - Google Patents

Recipient a parois souples pour produits sous pression Download PDF

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Publication number
EP0029039B1
EP0029039B1 EP80900924A EP80900924A EP0029039B1 EP 0029039 B1 EP0029039 B1 EP 0029039B1 EP 80900924 A EP80900924 A EP 80900924A EP 80900924 A EP80900924 A EP 80900924A EP 0029039 B1 EP0029039 B1 EP 0029039B1
Authority
EP
European Patent Office
Prior art keywords
cap
wall
flange
dome portion
container
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
Application number
EP80900924A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0029039A1 (fr
Inventor
Alain Buquet
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.)
Thimonnier SAS
Societe de Conditionnement en Aluminium SCAL GP SA
Original Assignee
Thimonnier SAS
Societe de Conditionnement en Aluminium SCAL GP SA
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 Thimonnier SAS, Societe de Conditionnement en Aluminium SCAL GP SA filed Critical Thimonnier SAS
Publication of EP0029039A1 publication Critical patent/EP0029039A1/fr
Application granted granted Critical
Publication of EP0029039B1 publication Critical patent/EP0029039B1/fr
Expired 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing

Definitions

  • the present invention relates to the production of receptacles with flexible walls intended to contain pressurized products such as beer or carbonated liquids. More particularly, it relates to the production of flexible material bottoms for these containers.
  • Containers with flexible walls can be made from light and inexpensive materials, such as paper, plastic, metallic foil, or thin laminate complexes combining the qualities of various materials. These containers are economical. They also have the advantage of being much less dangerous than rigid containers if they are used as projectiles when they are full. Therefore, we recommend their use, during public events, for the distribution of drinks or various objects.
  • the flexible walls are generally made of laminated materials with a core or at least an internal reinforcement which ensures mechanical resistance while appropriate coatings provide on each face the functions of resistance to corrosion or abrasion.
  • the core of these flexible walls is often a thin sheet of aluminum which performs the functions of sealing and tensile strength but which has poor corrosion resistance. This core is protected on the internal side of the container by a coating which must be inert with respect to the content, and even aseptic if this content is a food or pharmaceutical product.
  • the coatings of the internal faces of the body as well as of the bottoms must meet the same requirements. They are, most often, identical, or at least in very similar composition materials. They can therefore be easily glued or welded to each other.
  • the pressure forces which are exerted on the entire surface of the bottom, in particular on the annular groove, have, in fact, an axial resistance which pushes the bottom by tending to progressively unwind the annular groove outwards.
  • the zone of connection of the body with the inverted edge of the cap forms an acute dihedral inside which exerts the internal pressure which tends to open the dihedral and to progressively spread the flexible walls vis-à-vis . So that the connection between bottom and body resists, it is essential to distribute the pressure force over a certain extent of the facing wall surfaces to relieve the weld at their connection line.
  • FR 2311 730 gives a solution which consists in stiffening by an annular element attached the connection groove between the domed cap of the bottom and its turned edge.
  • this solution is expensive. It involves consumption of additional material corresponding to the manufacture of the rigid annular element. It requires an additional operation of placing the rigid element, an operation which can hardly be done at the current production and filling rates of the packages.
  • the object of the present invention is to provide a better solution to the problem of the production of receptacles with flexible walls resistant to pressure, in particular to the production of the bottom edges and of their connection with the body.
  • This solution consists, as in the last solution, in making a bottom in the shape of a domed cap bordered by a coaxial cylindrical collar. But, instead of the collar being composed only of an edge turned outwards towards the top of the cap, it develops on either side of the plane defined by the periphery of the domed cap.
  • the axial section of the bottom and its flange thus has a shape substantially in H and no longer in M.
  • the section of the cap corresponds to the horizontal bar of the H while the section of the cylindrical flange forms the two vertical bars, and on the other side of the cap.
  • This flange in two elements is connected tangentially with the periphery of the cap without any point of inflection. It considerably stiffens the bottom and makes any reinforcing element such as that proposed by FR 2311730 useless.
  • the bottom in laminated sheet is produced from a blank in the shape of a glove finger composed of a cap and a cylindrical skirt extending the periphery of the cap. This cap is turned over by pushing it inside the skirt. We also return a skirt portion adjacent to the cap which comes inside the lower part of this skirt. The base of the skirt is possibly flared to form a side flange.
  • the various operations for forming the bottom from a laminated sheet blank can be carried out practically simultaneously on double-acting presses operating at rapid rate.
  • the coating protecting the internal face of the cap thus continues without a solution of continuity on the external face of the collar, this thanks to the rolling up of the skirt.
  • the internal coating of the cap is identical or at least very similar to that of the body, the same applies to the external coating of the collar which is similar to the internal coating of the body.
  • the connection between the flange and the body by welding or gluing over the entire height of the flange poses no problem.
  • the diameters of the cap and its collar are chosen so that the collar just fits into the body of the container undergoing a very slight contraction which applies the facing surfaces against each other.
  • the H-shaped bottom formed by the cap and its protective collar forms a cartridge that is easy to install in the cylindrical body.
  • the opposite faces of the skirt are linked to each other by a means such as welding or gluing.
  • This operation freezes the relative dimensions of the bottom, that is to say the height of the flange relative to the cap. This operation is generally done at the same time as the connection between the flange and the container body.
  • the blank in the thimble of FIG. 1 consists of a domed cap 1 ′ and a cylindrical skirt 2 which extends around the periphery 3 of the domed cap.
  • the domed cap has an arrow “f and an outside diameter“ d •.
  • the length "1" of the skirt 2 is greater than the arrow "f of the cap 1 '.
  • the thimble blank shown in FIG. 1 has a core 4 of aluminum sheet 0.14 mm thick. This sheet is protected against corrosion on each side by a layer of polyethylene.
  • the polyethylene layer 5, which must be in contact with the product, inside the container, as shown in Figures 3 or 4, has a thickness of 80 microns.
  • the layer 6 which must protect the aluminum against the atmosphere has a thickness of 30 microns. This blank was itself obtained by stamping a flat blank, not shown.
  • the internal layer 5 is present outside the blank as a thermowell, while the layer 6 is inside.
  • the cap 1 'of the glove finger and a first part of the skirt 2 are turned over.
  • the apex 7 of the domed cap is pressed towards the base plane P of the skirt, with a depth f + h close to 1 + f / 2, but slightly less however by a height e.
  • the blank was then given its final shape of a domed cap bordered by a flange 8 of height h + f + e which extends on either side of the periphery 3 of the flange.
  • h 6 mm
  • e 3 mm
  • f 11 mm
  • d 55 mm.
  • the bottom section has an H shape, the two vertical bars of which consist of the section of the flange 8 while the convex bottom corresponds to the horizontal bar.
  • the cylindrical flange 8 consists of two elements: an upper lip 9 formed by a double wall thickness, of height h in the extension of the periphery 3 of the domed cap 1 and a lower element 10 substantially of the same diameter d.
  • This element 10 corresponds to the flipped edge of US Patents 3712497 and FR 2311 730, while the upper lip 9 by itself provides sufficient rigidity which makes an additional reinforcing element unnecessary as in the French patent.
  • the upper lip 9 has been shown with a large thickness, while this thickness is in fact only of the order of 0.50 mm, the two wall thicknesses being applied one against the other. the other.
  • a bottom was thus produced, the domed cap of which is housed therein in a sort of cylindrical cartridge of diameter substantially d, of thickness ⁇ relatively thin, and of height h + f + e.
  • This cartridge just enters the body 11 of the container with even a slight tightening of the order of 0.2 mm on the diameter.
  • the lower element 10 of the flange 8 allows precise positioning of the curved portion relative to the body 11, as shown in FIG. 3. It usefully reinforces the end of this body 11.
  • the internal layer 5 of the domed portion of the bottom continues without a solution of continuity outside the flange 8 and is located opposite the internal layer 12 of the body.
  • the layers 5 and 12 of the bottom and of the body are here both made of polyethylene. They can be glued or welded without difficulty. The very slight tightening of the collar 8 in the body 11 is sufficient to ensure good contact of the facing surfaces over the entire height of the collar.
  • the flange 8 is welded over its entire height to the internal layer 12 of the body, ie over the height h + f + e. Simultaneously, the layer 6 is welded onto itself over the height h corresponding to the lip 9 obtained by inversion of the skirt part adjacent to the domed cap 1 '. Thus, the flange 8 is immobilized relative to the cylindrical body 11 and the domed cap 1 'relative to the flange 8. This double welding is easily carried out by heating the aluminum layers by high frequency induction.
  • the flexible material connection groove between the flange 8 and the domed cap l does not have a significant surface oriented perpendicular to the pressure forces d in the axial direction and which is liable to gradually deform as is the case in US Pat. 497 and FR 2 311 730.
  • the two walls of the thin lip 9 are substantially contiguous, closely linked by a weld zone 14.
  • the external face of the lip 9 is itself linked to the body by the weld 15 over the entire height h, here 6 mm.
  • the three concentric walls form a block over the entire height h.
  • the axial force absorbed by the domed cap 1 ′ of diameter d is transmitted by the edge 3 in the form of a tangential tensile force over the whole of the lip 9. It does not apply, as in art front, on the single connection line 16 between lip 9 and internal layer 12 of the wall 11, but is distributed over the entire height surface h of the welds 14 and 15. Finally, the lower element 10 of the flange is itself even welded to the wall 11. It contributes to blocking the upper lip 9 by preventing any possibility of displacement by sliding of this lip against the wall 11. This lower element 10 reinforces the end of the cylindrical wall 11 which is the part of the container most exposed to shocks.
  • the collar 8 can be given a very slightly conical shape, tapering towards the center of the container.
  • the internal surface of the cylindrical body 11 must not have any rough edges.
  • overlap welds of the types described in FR 1 359 243 or FR 1 571 771 are not used.
  • the sheet is wound so that its two ends are presented end to end as shown in FIG. 6.
  • the mechanical resistance along the longitudinal joint is ensured by welding or gluing of a resistant tape 18 outside the container, while the sealing and the internal protection against corrosion are ensured by the application of a thin strip 19 of flexible material.
  • This ribbon for example a "Saranex" ribbon from DOW CHEMICAL, has a moisture-impermeable barrier layer 20 of polyvinilydene chloride protected on both sides by a thin layer of polyethylene.
  • the composite sheet constituting the body 11 shown in FIG. 6 is made up, like the bottoms, of an internal protective layer 12 of polyethylene, of an aluminum sheet 21 and of an external layer 22 of polyethylene. However, to increase the rigidity of the container, this sheet 11 also comprises a layer of cardboard 23 with a thickness of the order of 0.4 mm.
  • the external resistant tape 18 has a width 1 of 10 mm as well as the internal sealing tape 19.
  • the tape 18 shown is cut from the same sheet as that constituting the body.
  • the internal tape 19, very malleable and flexible, has a thickness of 0.08 to 0.1 mm. When each bottom is put in place, it is partially pushed back into the longitudinal gap 24 between the ends which come end to end of the sheet constituting the body 11. The edges of this strip 79 are simultaneously flattened at a bevel and are connected practically without roughness with the polyethylene layer 12.
  • FIGS. 7 and 8 For chemically not very aggressive products, such as sparkling water, an easy opening device can be produced as shown in FIGS. 7 and 8.
  • One or more perforations 25 are made before stamping in the flat blank in which to be formed the bottom. These perforations 25 are closed with a thin cover 26 which is fixed by gluing. The blank and the cover 26 are formed at the same time and the device shown in FIGS. 7 and 8 is obtained very economically.
  • the surface layers of protection against corrosion and humidity, 5, 6, 12, 22 are made of polyethylene. These protective layers can be of various other plastics or varnishes. Thus, the outer layers 6 and 22 are frequently in varnish with a thickness of the order of 10 microns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Laminated Bodies (AREA)
EP80900924A 1979-05-23 1980-12-01 Recipient a parois souples pour produits sous pression Expired EP0029039B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7913924 1979-05-23
FR7913924A FR2457223A1 (fr) 1979-05-23 1979-05-23 Recipient a parois souples pour produits sous pression

Publications (2)

Publication Number Publication Date
EP0029039A1 EP0029039A1 (fr) 1981-05-27
EP0029039B1 true EP0029039B1 (fr) 1983-05-11

Family

ID=9226066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80900924A Expired EP0029039B1 (fr) 1979-05-23 1980-12-01 Recipient a parois souples pour produits sous pression

Country Status (13)

Country Link
EP (1) EP0029039B1 (es)
JP (1) JPS56500567A (es)
AR (1) AR223525A1 (es)
AT (1) ATE3268T1 (es)
BE (1) BE883431A (es)
BR (1) BR8008691A (es)
DE (1) DE3063073D1 (es)
ES (1) ES250878Y (es)
FR (1) FR2457223A1 (es)
GR (1) GR67668B (es)
IT (1) IT1193934B (es)
WO (1) WO1980002544A1 (es)
ZA (1) ZA803071B (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3110697A1 (de) * 1981-03-19 1982-10-07 Robert Bosch Gmbh, 7000 Stuttgart Verpackungsbehaelter
US4525396A (en) * 1982-08-13 1985-06-25 Asahi Kasei Kogyo Kabushiki Kaisha Pressure-resistant paper vessel
DE3305144A1 (de) * 1983-02-15 1984-08-16 Hoechst Ag, 6230 Frankfurt Innendruckbelastbare verpackung aus flexiblem material fuer fuellgueter, vorzugsweise fluessigkeiten, verfahren zur herstellung einer befuellten verpackung und verwendung der verpackung
SE444423B (sv) 1983-11-07 1986-04-14 Akerlund & Rausing Ab Forslutning till forpackningsbehallare
DE3407899C2 (de) * 1984-03-03 1986-05-15 INDAG Gesellschaft für Industriebedarf mbH, 6900 Heidelberg Gasdichter Getränkebehälter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740572A (en) * 1952-09-19 1956-04-03 Hinde & Dauch Paper Co Tubular shipping container
FR2311730A1 (fr) * 1975-05-23 1976-12-17 Scal Gp Condit Aluminium Emballage semi-rigide pour boissons gazeuses
FR2340862A2 (fr) * 1976-02-13 1977-09-09 Scal Gp Condit Aluminium Emballage semi-rigide pour boissons gazeuses

Also Published As

Publication number Publication date
IT8022122A1 (it) 1981-11-16
ES250878U (es) 1980-09-01
FR2457223A1 (fr) 1980-12-19
ZA803071B (en) 1981-05-27
EP0029039A1 (fr) 1981-05-27
WO1980002544A1 (fr) 1980-11-27
ES250878Y (es) 1981-04-16
ATE3268T1 (de) 1983-05-15
GR67668B (es) 1981-09-02
AR223525A1 (es) 1981-08-31
BR8008691A (pt) 1981-04-14
JPS56500567A (es) 1981-04-30
DE3063073D1 (en) 1983-06-16
BE883431A (fr) 1980-11-24
FR2457223B1 (es) 1983-01-14
IT1193934B (it) 1988-08-31
IT8022122A0 (it) 1980-05-16

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