Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-05-15
1997-03-25
Yoder, Michele K.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156210, 156471, 156472, 156473, B31F 128
Patent
active
056140487
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the manufacture of corrugated board and more particularly to a machine for manufacturing a sheet of single face corrugated board by glueing a fluted sheet of board onto a flat sheet of board, termed liner sheet, of the type comprising three heating cylinders which are substantially tangential in pairs, with parallel axes, namely a first fluted cylinder for preforming the fluted sheet, a second, central, fluted cylinder associated with means for applying the fluted sheet against its periphery, and a third, smooth, cylinder for bringing the flat sheet into contact with the flutes of the fluted sheet at the periphery of the second cylinder, as well as means for coating the said flutes with glue before the contact between fluted sheet and liner sheet.
It also relates to a process for manufacturing sheets of single face corrugated board, particularly using a machine of the above type.
It finds a particularly important, although not exclusive, application in the field of the manufacture of single face sheets at high speed using board obtained from low grammage (less than of the order of 150 g/m.sup.2) recycled paper.
DESCRIPTION OF THE PRIOR ART
Machines of the above-defined type are already known.
FIG. 1 thus represents a machine 1 of the prior art in a line 2 for manufacturing single face corrugated board.
The line comprises means 3 and 4 respectively for feeding flat, liner sheet and flat sheet which is intended to form the fluted sheet.
These feed means comprise, in a way which is itself known, reel unwind stands 5 which allow good control of the unwinding and of the braking which are necessary for the manufacture of the board.
They also comprise a preheater 6 for the liner sheet, generally consisting of a steel cylinder heated by steam and equipped with small rolls termed "turn rolls" which serve to vary the paper/cylinder contact area, and a preconditioner 7 for the fluted sheet, which for its part and furthermore includes a boom for moistening the sheet, which promotes the formation of the flutes.
The line 2 moreover comprises means 8 for discharging the single face board obtained, these means consisting of a system of belts at the top part of the line.
FIG. 2 shows more precisely, in a sectional view, the single face machine 1 of the line of FIG. 1.
It comprises, on the fluted sheet feed side, an additional preheating cylinder 9 and a moistening cylinder 10 and, on the liner sheet feed side, two rotating preheating cylinders 11.
The machine 1 moreover comprises a first, top, fluted cylinder 12 made of stainless steel. It is hollow and designed to be heated with steam in a way which is itself known.
The machine 1 also comprises a second, central, fluted cylinder 13 made of stainless steel of axis parallel to that of the first cylinder substantially tangential to the latter and, for example, of the same diameter.
The second cylinder is, for example, of the type known under the name "Air Drive", manufactured by the French company MARTIN.
It includes two chambers, namely a central steam-heated chamber and a vacuum chamber 15 connected to a device 16 for forming a vacuum. The chamber comprises ducts 17 pierced along the entire length of the cylinder and communicates with the fluted peripheral surface via holes.
The machine 1 comprises a third, bottom, cylinder 18 with a smooth surface, of axis parallel to the first two and, for example, of the same diameter. This cylinder is heated with steam in a similar way to the first two and is designed to compress the liner sheet against the crests of the flutes of the fluted sheet, in contact with the periphery of the central fluted cylinder, as will be seen.
The machine 1 moreover comprises means 19 for coating the crests of the flutes with glue, these means being in themselves known, and comprising a laminating roll 20, a bath of glue 21 and a glueing roll 22.
The operating principle of the machine 1 is as follows.
Two sheets or webs of paper in board 23 and 24 are introduced into the machine 1.
The sheet 23
REFERENCES:
patent: 1186998 (1916-06-01), Langston
patent: 1199508 (1916-09-01), Swift, Jr.
patent: 3811987 (1974-05-01), Wilkinson et al.
patent: 3981758 (1976-09-01), Thayer et al.
patent: 4086116 (1978-04-01), Yazaki et al.
Barny Jean-Jacques
Paultes Jean-Marie
Otor
Yoder Michele K.
LandOfFree
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