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
  • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
  • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
  • B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls
  • B65D7/36—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls formed by rolling, or by rolling and pressing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D51/00—Making hollow objects
  • B21D51/16—Making hollow objects characterised by the use of the objects
  • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
  • B21D51/44—Making closures, e.g. caps
  • B21D51/46—Placing sealings or sealing material
• • 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
  • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material

Definitions

• the invention relates to a drum comprising a steel body and steel end walls which are joined together by means of a folded seam which is provided with a seal in the core.
• the folded seam joint between body and end wall can consist of a flat, so-called double folded seam or a more or less rounded triple folded seam.
• the latter fol ⁇ ded seam is preferable.
• the object of the invention is then to produce a solution to this sealing problem.
• the seal comprises a filament made of a deformable plastic, which can adhere with its surface to the steel surface of the folded seam parts, and is chemically resistant as regards the contents of the drum.
• Chemically resistant is understood to mean an acceptable resistance and/or a material which does not breach any regulations concerning the packaging of foodstuffs.
• the filament which in fact has to form the seal, is chemically resistant as regards the contents of the drum.
• “Chemically resistant” can be understood to mean that the filament is completely inert in its behaviour rela ⁇ tive to the contents, but also that the material of the filament undergoes an extraction which remains well below the limit which is set for it when an effort is made to dissolve it in the material which can form the contents of the drum. It is also important for the filament to be made of a material which meets all regulations concerning the packaging of foodstuffs.
• the adhesion of the plastic filament to the steel surface of the folded seam parts is another essential condition.
• Heat is ne ⁇ cessary for optimum adhesion. It can arise during folding, but is fed in particularly after folding during heating to higher tempera- tures, for example during stoving of the coat of paint which is applied to the outside of the drum.
• the effect achieved by this adhesion is that, even if the folded seam is deformed due to damage to the drum, the seal remains in place even at the so difficult intersection of the lengthwise seam of the drum body with the fol- ded seams. It has also been found in falling tests that the good adhesion makes an essential contribution to the strength of the folded seam. If the drum is damaged, unfolding of the folded seam now occurs less quickly, which also helps the seal.
• the invention also comprises a process for the production of the drum, which is characterized in that the filament to be placed in the preliminary curvature is made of a length that is shorter than the peripheral length of the preliminary curvature, which gives the effect of the closed plastic sealing ring already des- cribed.
• This filament can be placed in the preliminary curvature after the end wall in the folding machine is placed on the drum body.
• the body with the end wall or cover placed thereon is then set in rotation; the preliminary curvature is provided if it has not already been carried out in an earlier operation, and the filament to be guided by suitable means into the preliminary curva ⁇ ture then remains in position therein as a result of the centri- fugal action.
• This is preferably carried out just before the edge of the body flange goes into the preliminary curvature, so that the opening of the preliminary curvature, which opening is facing said body flange, is closed immediately after introduction during the further folding operation.
• the filament can also be placed in the preliminary curvature before the end wall is placed on the body of the drum.
• the end wall is set in rotation, the preliminary curvature is provided, and during or after this operation the filament is guided into the pre- liminary curvature.
• a slight adhesion of the filament in the precurl can be obtained by heating the end wall but, it is preferable, after the application of the filament, to make the opening of the preliminary curvature of a size which is slightly smaller than the diameter of the filament.
• the filament can be placed by mechanical means, but the best solution with the most rapid effect is obtained if the filament is fed into the preliminary curvature by means of a stream of air which guides and transports the filament.
• the filament can be a solid filament, but can also have a cellular structure. Some rigidity is desirable, so that the fila ⁇ ment is not only easily guided to bridge the distance between the insertion means, such as the air jet nozzle, and the preliminary curvature, but also so that the filament can be held with some tension in the preliminary curvature, for the filament is in fact bent according to the curvature of the periphery.
• FIG. 1 shows a mechanical insertion device
• Fig. 2 shows a pneumatic insertion device
• Fig. 3 also shows a pneumatic insertion device.
• the filament 1 is pressed into the preliminary curvature 2, which has an opening which is slightly smaller than the diameter of the filament, from the end wall flange 3 by means of a rotary roller 4. This operation is preferably carried out before the end wall 3 is joined to the body.
• end wall flange 3 and body flange 5 have already been placed on each other, and the end wall flange is already provided with a preliminary curvature.
• Reference number 6 indicates a compressed air nozzle through which the filament 1 is conveyed and is, as it were, sprayed into the preliminary curvature 2 of the end wall flange, and takes up the position there indicated by solid lines. This can be carried out just before the folding rollers of the folding machine fold the curvature 2 further and finish the folded joint.
• the end wall is already provided with a preliminary curvature 7 and a filament 9 fed in by means of a compressed air nozzle 8 before the end wall is placed on the body of the drum.
• the opening of the preliminary curvature is reduced to a size which is slightly smaller than the diameter of the filament as indicated by 10.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19850953

Family Applications (1)

Country Status (19)

Citations (6)

• 1987
  • 1987-11-20 NL NL8702793A patent/NL8702793A/nl not_active Application Discontinuation
• 1988
  • 1988-11-11 WO PCT/NL1988/000049 patent/WO1989004799A1/en active Application Filing
  • 1988-11-11 DE DE8888202533T patent/DE3862101D1/de not_active Expired - Fee Related
  • 1988-11-11 JP JP63509478A patent/JPH03501011A/ja active Pending
  • 1988-11-11 ES ES88202533T patent/ES2021424B3/es not_active Expired - Lifetime
  • 1988-11-11 AT AT88202533T patent/ATE61777T1/de not_active IP Right Cessation
  • 1988-11-11 BR BR888807807A patent/BR8807807A/pt unknown
  • 1988-11-11 EP EP88202533A patent/EP0317008B1/en not_active Expired - Lifetime
  • 1988-11-16 ZA ZA888563A patent/ZA888563B/xx unknown
  • 1988-11-16 TR TR88/0838A patent/TR24249A/xx unknown
  • 1988-11-18 AR AR88312501A patent/AR244159A1/es active
  • 1988-11-18 PT PT89037A patent/PT89037B/pt not_active IP Right Cessation
  • 1988-11-18 IN IN958/CAL/88A patent/IN168908B/en unknown
  • 1988-11-19 CN CN88107948A patent/CN1015247B/zh not_active Expired
• 1989
  • 1989-07-20 KR KR1019890701373A patent/KR890701442A/ko not_active Application Discontinuation
• 1990
  • 1990-05-09 DK DK115590A patent/DK115590A/da not_active Application Discontinuation
  • 1990-05-18 FI FI902476A patent/FI89344B/fi not_active Application Discontinuation
• 1991
  • 1991-03-21 GR GR91400226T patent/GR3001637T3/el unknown
• 1992
  • 1992-05-11 SG SG52592A patent/SG52592G/en unknown

Patent Citations (6)

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