Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-01-05
2000-05-30
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156210, 156471, 156472, 156473, B31F 128
Patent
active
06068724&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the manufacture of corrugated board and more particularly a machine for manufacture of a sheet of single-face corrugated board by gluing a fluted sheet of board onto a plane sheet of board, known as the cover sheet, of the type comprising three heating cylinders which are substantially tangent in pairs and have parallel axes, namely a first, fluted cylinder for preforming the fluted sheet, a second, fluted, central cylinder associated with means for applying the fluted sheet against the external wall of the said second cylinder upstream of the first contact between plane sheet and fluted sheet, and a third, smooth cylinder for bringing the plane sheet into contact with the flutes of the fluted sheet at the periphery of the second cylinder, as well as means for gluing the flutes before contact between plane sheet and fluted sheet.
It also relates to a method of manufacture of sheets of single-face corrugated board, especially using a machine of the type hereinabove.
It finds one particularly important, although not exclusive, application in the field of the high-speed manufacture of single-face sheet, for example with board obtained from recycled paper with low grammage (less than of the order of 150 g/m.sup.2).
BACKGROUND OF THE INVENTION
Machines of the type defined hereinabove are already known.
Thus, FIG. 1 represents a machine 1 of the prior art in a production line 2 for single-face corrugated board.
The line comprises feed means 3 and 4 respectively for plane sheet, cover sheet and plane sheet intended to form the fluted sheet.
These feed means comprise, in a manner which is known per se, unwinders for reels 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 cover sheet, generally consisting of a steel cylinder heated by steam and fitted with small rolls called "turn rolls" which serve to alter the paper/cylinder contact surface area, and a preconditioner 7 for the fluted sheet, which, for its part, furthermore comprises a boom for wetting the sheet, which promotes the formation of the flutes.
The line 2 moreover comprises means 8 for removing the single-face board obtained, which means consist of a system of belts at the top part of the line.
FIG. 2 more precisely shows, in section, the single-face machine 1 of the line in FIG. 1.
It comprises, on the fluted-sheet feed side, an additional preheating cylinder 9 and a wetting cylinder 10, and, on the cover-sheet feed side, two rotating preheating cylinders 11.
The machine 1 moreover comprises a first, upper, fluted cylinder 12 made of stainless steel. It is hollow and arranged to be heated by steam in a manner which is known per se.
The machine 1 also comprises a second, fluted, central cylinder 13 made of stainless steel, of axis parallel to that of the first cylinder substantially tangent to the latter and, for example, of the same diameter.
The second cylinder is, for example, of the type known by the brand name "Air Drive" manufactured by the French company MARTIN.
It comprises two chambers, namely a central chamber heated by steam and a vacuum chamber 15 connected to a depressurization device 16. The chamber comprises channels 17 pierced over the entire length of the cylinder and communicating with the fluted peripheral surface via holes.
The machine 1 comprises a third, lower cylinder 18 of smooth surface, of axis parallel to the first two and, for example, of the same diameter. This cylinder is heated by steam in a manner similar to the first two and is arranged to compress the cover sheet against the ridges of the flutes of the fluted sheet, in contact with the periphery of the central fluted cylinder, as will be seen further on.
The machine 1 moreover comprises means 19 for gluing the crests of the flutes, which means are known per se, comprising a calender roll 20, an adhesive tank 21 and a gluing roll 22.
The principle of operation of the machine 1 is as follows.
Two sheets or
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Baillet Louis
Barny Jean-Jacques
Paultes Jean-Marie
Ball Michael W.
Otor
Piazza Gladys
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