EP1010518A1 - Procédé pour améliorer la fabrication d'un bord roulé d'un carton - Google Patents

Procédé pour améliorer la fabrication d'un bord roulé d'un carton Download PDF

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Publication number
EP1010518A1
EP1010518A1 EP99124381A EP99124381A EP1010518A1 EP 1010518 A1 EP1010518 A1 EP 1010518A1 EP 99124381 A EP99124381 A EP 99124381A EP 99124381 A EP99124381 A EP 99124381A EP 1010518 A1 EP1010518 A1 EP 1010518A1
Authority
EP
European Patent Office
Prior art keywords
edge
bead
board
carton
side wall
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Withdrawn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
EP99124381A
Other languages
German (de)
English (en)
Inventor
Paul c/o FCP Nixon (UK) Ltd.
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.)
A&R Carton UK Ltd
Original Assignee
FCP UK 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
Application filed by FCP UK Ltd filed Critical FCP UK Ltd
Publication of EP1010518A1 publication Critical patent/EP1010518A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/008—Shaping of tube ends, e.g. flanging, belling, closing, rim-rolling or corrugating; Fixing elements to tube ends
    • B31F1/0087—Rim-rolling

Definitions

  • This invention relates to a method for manufacturing a bead on a carton, in particular for a "cup-type" carton made of folding box board and like types of board which are of laminar construction, as opposed to conventional cup-stock board which typically has only a single ply.
  • the invention also relates to a carton provided with a bead manufactured from such board types.
  • carton is meant any board structure which has at least one continuous edge, for example being the uppermost edge around the side walls of a cup.
  • Cup-type cartons are conventionally manufactured from two pieces of coated board, one of which forms the base of the cup, the other forming the side walls thereof by being wrapped around the base such that a pair of edges overlap and may be sealed together to form a seam.
  • a bead is provided on the uppermost edge of the carton to increase the rigidity and is produced by curling the material of the side walls outwardly of the carton and back underneath itself.
  • the curling of the board to form the bead is conventionally effected by forcing the peripheral edge of the previously erected cup into one side of a generally curved channel. As the edge is forced deeper into the channel, the curvature thereof urges the edge outwardly and imparts a curvature to the board which is plastically deformed in the process such that said curvature is partially retained proximate the edge of the board. As cup continues to be forced into said channel, the edge is curled outwardly of the cup and back underneath the portion of the board at that time disposed within and to which curvature is being imparted by the channel.
  • the degree to which the curvature is retained by the board and the curvature of the channel itself is sufficient to ensure that the edge of the board is urged into sliding contact with the outer surface of the cup and continues to slide within the bead thus formed.
  • the bead may take the form of an outwardly radiating spiral of board which terminates at the uppermost edge of the side walls of the cup.
  • cup-type cartons are manufactured from cup-stock board which is typically constructed of at most two laminations adhered together, but more usually only a single lamination of pulp board. It will be appreciated that boards of only a single lamination are far better suited to the formation of beads around carton edges, and are furthermore suited to manufacture of cartons whose edges or sides are significantly curved because the inner and outer surfaces of a board which is curved are strained to different degrees as a result of the curvature, and therefore differential stresses are set up within the board between the inner and outer surfaces.
  • Single ply boards can easily withstand such differential stresses without significant degradation of the board, as the work required to be done on the board to effect any separation of the inner and outer surfaces thereof is typically in the region of 220 J/m 2 which far exceeds that done during a simple beading operation. Furthermore, the stretch factor of common cup stock boards is approximately 7-8% which allows the board to stretch sufficiently during the formation of the bead without degradation.
  • Cup-stock board has however the inherent disadvantage of being expensive. It has been therefore proposed to use another type of board known to persons skilled in the art as "folding box board", so-called because its construction has previously been contrived such that the board will retain a fold line.
  • Folding box board commonly has at least 3 plies and the laminated construction of such board allows for only minimal stretch factor, at most in the region of 2-3% before degradation of the board, which is often manifested in the separation of the plies at the edges thereof.
  • the stretch factor of the board is a measure of how much the board can be stretched before delamination of the board occurs wherein the individual plies of the board begin to separate from one another and fraying or "flagging" of the edges results.
  • the incomplete bead so formed has deleterious effects on the integrity and rigidity of the carton.
  • a method of providing a bead on a carton edge which is continuous and defining a side wall of a carton comprising the step of progressively urging the said edge into a continuous channel with a curved cross-section which imparts a curl to board material immediately behind the edge as said edge is urged thereinto, characterised in that the edge or a portion of the board immediately behind said the edge comes into contact with orientation means as it approaches the side wall of the carton underneath the bead thus formed, the said orientation means ensuring that the edge is deflected internally of the bead thus formed.
  • the carton is manufactured from a folding box board type material which is prone to delamination.
  • the edge comes into contact with the surface of the side wall and is permitted to slide thereon and within the bead thus formed.
  • the orientation means deflect the edge against the side wall such that the line tangential to the curved board proximate the edge makes an acute angle with the plane containing the side wall at the point of contact.
  • the orientation means deflects the edge simultaneously with the curling of the board to form the bead.
  • orientation means are provided as an extension of the curved channel and deflect the edge back within the bead formed thereby.
  • the orientation means comprise at least one die ring provided behind the bead formed by the curved channel and which is separate thereto to deflect the edge during curling of the bead to ensure delaminated edges of the board move in the desired direction into and within the bead thus formed.
  • the die ring is provided with a deflection portion which contacts the edge and/or the board proximate the edge and deflects same into and within the bead thus formed.
  • said the deflection surface of said die ring permits slippage of the edge of the carton and board surface immediately behind said edge thereover to facilitate formation of the bead.
  • the deflection surface of the die rings is arcuate to deflect the edge as desired.
  • the deflection portion of the die ring can be of any cross-sectional shape which deflects of the edge into and within the bead during formation thereof.
  • a simple stub may be sufficient provided that the stub is brought into contact with the outermost surface of the board proximate the edge and does not further separate any delaminated plies by being interspersed therebetween.
  • a lubricant is applied to the carton board on at least the uppermost edge of the side wall to improve the movement of said edge against a die ring to aid the curling process, or alternatively the lubricant may be applied within the primary bead forming channel and/or the deflection surface of the die ring.
  • FIG. 1 there is shown a carton 10 constructed from a side wall 12 and a base 14.
  • a bead 16 formed in accordance with the invention as described hereinafter is provided around the uppermost edge of the carton, and the side wall is constructed from a single piece of board material wrapped around the base portion and joined to itself at a seam 18.
  • the bead 16 is formed from curling the uppermost edge of the side wall underneath itself, and the process for providing said bead is described with particular reference to Figures 3 to 5 below.
  • the side wall 12 consists of folding box board with three plies A, B, C.
  • the formation of the bead 16 has been effected by curling the uppermost edge 20 of the side wall through an angle of greater than 270° from its original orientation.
  • the curling of the board proximate the edge is effected by urging the free edge of a carton, to which has firstly been applied an optional preliminary flare to facilitate the curling process, into a curved channel 30 which imparts a curvature to the board as the carton is urge towards said channel as indicated by arrow 32.
  • orientation means in the form of a die ring 22 with a deflection portion 24 are simultaneously brought into contact with the outermost ply A in the region of the flagged edge 34 to nip same back within the bead 16 thus formed.
  • the orientation means may form part of the channel 30 and be attached thereto at its extremity 40 as shown in Figure4 in dotted lines at 42.
  • the die ring may be brought into contact with the said outermost ply A as a separate operation from the curling effected by the channel 30 but simultaneously therewith.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
EP99124381A 1998-12-16 1999-12-07 Procédé pour améliorer la fabrication d'un bord roulé d'un carton Withdrawn EP1010518A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9827745 1998-12-16
GBGB9827745.2A GB9827745D0 (en) 1998-12-16 1998-12-16 Method of improving the manufacture of a bead on a carton

Publications (1)

Publication Number Publication Date
EP1010518A1 true EP1010518A1 (fr) 2000-06-21

Family

ID=10844367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99124381A Withdrawn EP1010518A1 (fr) 1998-12-16 1999-12-07 Procédé pour améliorer la fabrication d'un bord roulé d'un carton

Country Status (2)

Country Link
EP (1) EP1010518A1 (fr)
GB (1) GB9827745D0 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819658A (en) * 1953-06-23 1958-01-14 Continental Can Co Apparatus for curling edges on paper drinking cups
US3065677A (en) * 1959-07-20 1962-11-27 Paper Machinery Corp Rim curling mechanism for containers
US4034657A (en) * 1974-02-20 1977-07-12 Societe Generale Pour L'emballage Manufacture of receptacles
WO1996020684A1 (fr) * 1994-12-30 1996-07-11 Mcneil-Ppc, Inc. Applicateur de tampon possedant un element de prehension enroule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819658A (en) * 1953-06-23 1958-01-14 Continental Can Co Apparatus for curling edges on paper drinking cups
US3065677A (en) * 1959-07-20 1962-11-27 Paper Machinery Corp Rim curling mechanism for containers
US4034657A (en) * 1974-02-20 1977-07-12 Societe Generale Pour L'emballage Manufacture of receptacles
WO1996020684A1 (fr) * 1994-12-30 1996-07-11 Mcneil-Ppc, Inc. Applicateur de tampon possedant un element de prehension enroule

Also Published As

Publication number Publication date
GB9827745D0 (en) 1999-02-10

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