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
  • B31F7/00—Processes not otherwise provided for
  • B31F7/006—Processes not otherwise provided for edges, e.g. sheet edges
• • 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
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
  • B31B50/146—Cutting, e.g. perforating, punching, slitting or trimming using tools mounted on a drum
• • 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
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
  • B31B50/20—Cutting sheets or blanks
• • 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
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming

Definitions

• This invention concerns improvements in or relating to apparatus for treating blanks of corrugated board used in the manufacture of boxes, containers or the like, and in particular to the removal of waste material from defined areas of such blanks.
• the blanks are folded along pre-formed crease lines and opposite ends of the blanks are stuck together in overlapped relationship, so as to form a flat tube.
• a disadvantage of this is that when the partly formed boxes are stacked one on top of another, the overlapped portion is of double thickness which causes the boxes to stack unevenly.
• a method of reducing the thickness of overlapping areas of box blanks of corrugated board consisting of at least one layer of corrugated medium sandwiched between two outer liners comprising feeding blanks in succession, cutting through an outer liner of each blank to delineate a defined area which will overlap a similar area at an opposite edge of the blank when the blank is assembled into a box, and then cutting away substantially the entire thickness of the corrugated board over the said defined area.
• Figure 1 is a plan of a box blank having defined areas which have been reduced in thickness
• Figure 2 is a section on the line II - II of Figure 1
• Figure 3 is a section through the blank, similar to Figure 2, but after the blank has been folded into a flat tube,
• Figure 4 is a diagrammatic side view showing one form of apparatus for reducing the thickness of the defined areas of the blank of Figure 1,
• Figure 5 is a plan view of part of Figure 4,
• Figure 6 is a section on the line VI- VI of Figure 5, drawn to a larger scale
• Figure 7 is a section on the line VII - VII of Figure 5, drawn to a larger scale
• Figure 8 is a sectional view of a modified form of apparatus to that of Figure 4, and
• FIG 9 is a diagrammatic view of a further-modified form of apparatus to that of Figure 4.
• 2 is a box blank made from double faced corrugated board consisting of a single layer C of corrugated medium sandwiched between two flat outer liners L1, L2.
• the blank has parallel score lines 4 and 6 extending between the blank edges 8 and 10; opposed pairs of transverse slots 12, 14 and 16 extending between the score lines and the blank edges 18, 20; and score lines 22, 24 and 26 aligned with and extending between respective slots 12, 14 and 16.
• Flaps 28 and 30 extend respectively from the edges 8 and 10, the flaps being reduced in thickness over their whole areas, from opposite faces of the blank, as shown in Figure 2, at each end of the blank.
• the blank 2 is then folded, in known manner, along crease lines 22 and 26 to form the blank into a flat tube so that the remaining parts of flaps 8 and 10 overlap, and are stuck to, the opposite ends of the blank, as shown in Figure 3.
• FIG 4 from printing and slotting apparatus (not shown) of any known form, one at a time and spaced apart in the direction of feed.
• the blanks are as described above except that, at this stage, the flaps 8,
• Each pair of belts consists of respective upper and lower belts 32 and 34 between adjacent runs of which a blank is gripped and fed along a feed path defined by the adjacent runs of the belts, the belts extending between respective pulleys 36, 38 ( Figure 4).
• the flaps 28, 30 Whilst a blank is being fed by the belts 32, 34 the flaps 28, 30 are reduced in thickness over their whole areas by cutting away one of the liners L1, L2 and substantially the whole of the layer C, by means of respective cutting units indicated generally at 40 and 42.
• the units 40, 42 are very similar, in the following description the same reference number will be used for like parts in both units but with 100 added to the parts of unit 42.
• Each unit 40, 42 consists of a first circular cutter 44, 144 fixed on a shaft 46, 146 and, downstream therefrom, a second circular cutter 48, 148 fixed on a shaft 50, 150.
• the shafts 46, 50 and 146, 150 are driven by means of respective belts 52, 54 and 152, 154 from motors 56, 156, so that the peripheral speed of the cutters 44, 144, 48, 148 is 10 to 12 times faster than the speed at which the blanks are fed by the belts 32, 34, with all the cutters rotating in a vertical plane.
• the cutters 44, 48 rotate in an anti-clockwise direction, and the cutters 144, 148 rotate in a clockwise direction.
• the shafts 46, 50 are mounted so that the cutters 44, 48 are positioned below the feed path of the blanks and the shafts 146, 150 are mounted so that the cutters 144, 148 are positioned above the feed path.
• Each cutter is provided with a number of cutting edges 58 in a similar manner to that of a milling cutter.
• a respective suction box 60, 61 having slots 62, 63 in their bottom sides (see Figures 6 and 7) and to which suction is applied through pipes 54, 65.
• a respective section box 90, 92 having slots 94, 96 in their top sides and to which suction is applied through pipes 98,100.
• a fixed plate 66 is positioned as shown in Figures 4, 5 to help support the blank near the edge 8 thereof, and a further fixed plate 68 supports the edge 10 of the blank.
• the apparatus After having printing and slotting operations performed on it, the blank is fed towards the cutters 44, 144. The latter are positioned so that when they engage the respective flaps 28, 30, they do so in line with the edges 8, 10 of the blank. Just prior to the flap 8 engaging the cutter 44, suction is applied through the slot 62 so as to hold the flap flat as it passes the cutter. On engaging with the leading end of the flap 28 the cutter starts to cut through the bottom liner L2 and also the corrugated liner C, leaving the top liner L1 uncut, as shown in Figure 6.
• the cutter 44 makes a narrow cut 70 (the cutter may be, for example, 3mm wide) along the blank, at the base of the flap 28, in line with the edge 8.
• the cutter 44 makes a narrow cut 70 (the cutter may be, for example, 3mm wide) along the blank, at the base of the flap 28, in line with the edge 8.
• the cutter 144 makes a similar cut 72 at the base of the flap 30, in line with the edge 10 of the blank. However, in this case, as it is positioned above the blank, the cutter 144 cuts through the top liner L1 and also the corrugated layer C, leaving the bottom liner L2 uncut. The area of flap 30 to be reduced in thickness is thus delineated from the rest of the blank by the cut 72. Whilst the latter is being made, the flap 30 is held flat by suction applied to the suction box 90.
• the flap 28 engages the cutter 48 which progressively removes the remaining portions of the liner L2 and the corrugated layer C from that flap.
• the flap 28 is held against the bottom of the box 61 by suction applied through the slot 63.
• the cutter 148 removes the remaining portions of the liner LI and the corrugated layer C from the flap 30, with the flap being held flat by suction applied to the suction box 92.
• the flaps 28, 30 pass out of engagement with the respective cutters 48, 148, the flaps 28, 30 comprise only the liners L1 and L2 respectively.
• the waste material removed by the cutters 44, 48 is guided by baffle plates 74 ( Figure 4) so that it falls into a trough 76 and is carried away for disposal.
• the trough 76 may be vibrated, or may form part of any suitable type of air conveyor.
• a similar trough (not shown) is provided to collect waste material removed by the cutters 144, 148.
• the waste material may be removed by means of suction pipes (not shown) positioned adjacent the cutters, as is well known in the box making industry.
• the cutter 144 is replaced by a disc knife 77 fixed on the shaft 146
• the cutter 148 is replaced by a disc knife 78 fixed on a shaft 80 mounted at right angles to the shaft 146 so that the knife 78 rotates in a horizontal plane.
• the knife 77 makes a cut in the same position as the narrow cut 72 described above, and the knife 78 cuts through the corrugated layer C forming the flap 30 parallel to the liner L2 and as close to that liner as possible without damaging it.
• the knife 78 extends into the cut made by the knife 77, so that when the flap 30 passes away from the knife 78 the waste material is removed in one piece in any suitable way.
• the knife 78 may be replaced by a milling cutter similar to the cutter 148, but mounted in the same way as the knife 78. It will, of course, be appreciated that the same modification may be made to the cutter 48.
• the waste material is removed from the flap 30 by a cutting unit 82 comprising a disc knife 84 similar to knife 77, and a circular cutter 86 similar to the milling cutter 148.
• the knife 84 and the cutter 86 are mounted on a common shaft (not shown) so that, as the blank is fed by the belts 32, 34, the knife 84 makes a cut along the base of flap 30 to delineate the material to be removed therefrom, and the cutter 86 simultaneously removes that waste material.
• a similar cutting unit will also, of course, be provided to remove the waste material from flap 28.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Making Paper Articles (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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ID=10605294

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (11)

• 1986
  • 1986-10-04 GB GB868623896A patent/GB8623896D0/en active Pending
• 1987
  • 1987-10-05 DE DE87906827T patent/DE3786557T2/de not_active Expired - Fee Related
  • 1987-10-05 EP EP87906827A patent/EP0326573B1/de not_active Expired - Lifetime
  • 1987-10-05 WO PCT/GB1987/000703 patent/WO1988002306A1/en active IP Right Grant
  • 1987-10-05 JP JP62506179A patent/JPH02500828A/ja active Pending
• 1989
  • 1989-04-03 FI FI891589A patent/FI92568C/fi not_active IP Right Cessation

Non-Patent Citations (1)

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