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
  • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
  • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
  • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
  • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
  • B31F1/2813—Making corrugated cardboard of composite structure, e.g. comprising two or more corrugated layers

Definitions

• This invention concerns improvements in or relating to machines for making corrugated board, and in particular to the machines described and illustrated in Australian patent applications Nos. 62323/86 and 2271/85, in the name of AMCOR Limited, to which reference is directed in their entirety.
• a machine for making corrugated board comprising means to feed two separate webs between two respective pairs of corrugating rolls to form two corrugated layers, a first adhesive applicator for applying adhesive to the peaks of at least one of the two corrugated layers, means to bring the two corrugated layers together at the peaks of the corrugations, means to convey the joined corrugated layers past a second adhesive applicator for applying adhesive to the exposed peaks of one of the corrugated layers, and means to apply a liner, web to the corrugated layer having the adhesive on its peaks, and including means for pneumatically urging the corrugated layers into contact with the second adhesive applicator as the joined layers move past the second adhesive applying means.
• the joined corrugated layers are conveyed by a roll along a path which, in the absence of pneumatic pressure, would result in the exposed peaks of the corrugated layer being spaced from the second adhesive applicator, the joined corrugated layers being urged pneumatically away from the roll by air pressure applied from within the roll so as to engage the adhesive applicator.
• This ensures uniform contact of the peaks of the corrugated layer with the adhesive applicator, which is preferably in the form of a roll coated with a thin layer of adhesive.
• Figure 1 is a diagrammatic side view of a machine for making corrugated board
• Figure 2 is an enlarged detail of part of the machine of Figure 1.
• a web W1 is corrugated in known manner between fluted corrugating rolls 1 and 2, and a web W2 is similarly corrugated between similar rolls 3 and 4.
• Adhesive is applied to the peaks of the corrugations by an applicator roll 5 and the corrugated webs W1, W2 are brought together between the rolls 2 and 3.
• the webs W1,W2 are held to their respective rolls 2,3 by suction applied through chambers 6 and 7 respectively.
• the joined layers are then carried on the roll 3 towards a fluted carrier roll 8.
• the transfer to the roll 3 of the corrugated layer on roll 2 is assisted by air flow radially from a pressure chamber 9 in the roll 2.
• the joined corrugated layers are held on the fluted periphery of the roll 8 by suction applied through a chamber 10.
• the transfer from roll 3 to roll 8 is assisted by pressure air applied through a chamber 11 in the roll 3.
• adhesive is applied to the exposed (outwardly facing) peaks of the corrugated layer W2 by an adhesive applicator unit 12.
• the unit 12 comprises an applicator roll 13 which is positioned so that there is a small gap between its periphery and the peaks to which adhesive is to be applied.
• a container in the form of a square tube 14, extends across the machine and has a hole 15 in its upper wall.
• a plate 16 is fixed to the tube so that its top edge 16A is higher than the top of the tube, and a small gap is formed between it and the roll 13.
• a further plate 17 is also fixed to the tube 14, oppo.site the plate 16, so that its upper edge is higher. than that of the plate 16.
• the edge 16A of the plate 16 forms a weir, so that the amount of adhesive flowing over it and into contact with the roll 13 is substantially constant.
• Adhesive is fed from a tank (not shown) along a pipe 18 into the tube 14 and out through the hole 15, so that it flows over the plate 16 and onto the roll 13. Excess adhesive flows over the plate 17 and returns to the tank.
• the amount of adhesive carried on the roll 13 is metered by a roller 19 which, in turn, is cleaned by a doctor blade 20, and the adhesive is returned to the tank.
• the roll 13 rotates with the correct amount of adhesive thereon, the joined layers being conveyed by the roll 8 pass a pressure chamber 21 in the roll 8 from which air flows through suitable radial passages so as to urge the joined layers outwards towards the roll 13. This causes contact with the roll 13 and adhesive to be applied to the peaks.
• a liner W3 is fed around a roller 22 and applied to the adhesive-coated peaks of the outer corrugated layer formed by the web W2. Bonding of the liner to the peaks is assisted by heaters 23 and 24. The joined corrugated layers and the attached liner are then removed from the roll 8 by pressure air fr.om chamber 25 and are fed over a plate 26 towards further processing machinery which forms no part of the present invention.
• Pressure air is applied at chambers 27 and 28 provided in rolls 2 and 3 respectively so as to keep the suction holes in those rolls clear of any debris.
• the adhesive unit 12 is carried by a frame 29 which can move along a plate 30 on wheels 31.
• the frame has a toothed rack 32 fixed to it which is engaged by a pinion 33 driven by a motor 34.
• the heaters 23 and 24 are carried by a frame 35 having wheels 36 which run on a plate 37.
• a toothed rack 38 fixed to the frame 35, is engaged by a pinion 39 driven by a motor 40.
• the corrugating rolls and roll 8 are driven from a separate motor 41.
• the motors 34, 40 and 41 are connected to a central control unit 42, of a suitable known form, so that when the machine is stopped, the motors 34 and 40 are energised to rotate the respective pinions 33 and 39 and thus cause the adhesive unit 12 and the heaters 23 and 24 to be moved away from their respective operative positions.
• a manual override is also provided so that the various units may be moved as and when the operator wishes.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10645874

Family Applications (1)

Country Status (10)

Cited By (5)

Citations (7)

• 1988
  • 1988-10-27 GB GB888825145A patent/GB8825145D0/en active Pending
• 1989
  • 1989-10-26 ZA ZA898144A patent/ZA898144B/xx unknown
  • 1989-10-26 CA CA002001582A patent/CA2001582A1/en not_active Abandoned
  • 1989-10-27 WO PCT/GB1989/001290 patent/WO1990004513A1/en not_active Application Discontinuation
  • 1989-10-27 EP EP89912267A patent/EP0437541A1/en not_active Withdrawn
  • 1989-10-27 JP JP1511395A patent/JPH04502131A/ja active Pending
  • 1989-10-27 BR BR898907747A patent/BR8907747A/pt unknown
  • 1989-10-27 AU AU44982/89A patent/AU4498289A/en not_active Abandoned
• 1991
  • 1991-04-25 DK DK077091A patent/DK77091A/da unknown
  • 1991-04-26 FI FI912044A patent/FI912044A0/fi unknown

Patent Citations (7)

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