Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-10-06
1999-06-29
Crispino, Richard
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156470, 156499, 165 86, 165 89, 219470, 432 8, 432 60, B31F 128, B32B 3126, F26B 324, F26B 1306
Patent
active
059164093
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for heating a moving web, in particular a corrugated board web, as well as a preheater.
A preheater for a corrugated board web has been disclosed by DE 23 02 449. This known preheater has a heating drum that is driven to rotate. The web is supplied via a stationary inlet to the heating drum and is carried away from it via a stationary outlet. The heating drum is associated with a deflection roll for the web, which can be pivoted concentrically around the central axis of the heating drum. The pivot angle determines the contact area of the web on the heating drum and therefore the heat quantity to be transmitted. The pivoted deflection roll carries the web along and moves it over the heating drum, wherein the winding angle can be adjusted. This produces the heat transfer from the heating face of the drum into the adjoining outer layer of the web. In order to prevent the incoming web from touching the outgoing web, normally a second roll is provided in the circumference direction of the heating drum. For safety reasons, these rolls are spaced apart from the rotating heating drum by 120 mm. It is disadvantageous that the web can only wind around the heating drum with a maximal angle of approximately 270.degree.. Furthermore, the web can only be heated on one side by the heating drum, by means of which an uneven heating of the web takes place. There is also the danger that at high web speeds, due to the merely unilateral web heating, the adhesive applied in the adjoining adhesive mechanism does not set, i.e. develop a certain adhesive effect, rapidly enough.
SUMMARY OF THE INVENTION
The object of the invention is to establish a process and a device for heating a moving web, in particular a corrugated board web, by means of which it successfully increases the heating face without requiring more space and with a reduced construction cost. At the same time, an increased supply of heat and a more rapid heat transfer to adhesive application point should be made possible.
The invention eliminates the danger of intake between the deflection roll and the heating drum so that the safety distance prescribed by law between the deflection roll and the heating drum does not have to be heeded. In addition, the effective heating area is increased according to the invention, with a reduced space requirement and a reduced cost. Finally, the possible regulating range for the heat transfer is broadened. Also, the maximal winding angle of the heating drum can be enlarged by means of the web.
According to one embodiment of the invention, in a preheater of a known type, the rotary heating drum is associated with a heating face in the shape of a circular segment that is connected to the deflection roll so that it can be moved concentrically to the heating drum, wherein the other outer side of the web is guided via this circular segment-shaped heating face and rests against it.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in detail below in conjunction with an exemplary embodiment represented in the drawings.
FIG. 1 shows a partially sectional schematic representation of a preheater according to the invention, with the minimum winding angle of the web around the heating drum in connection with a unilateral corrugated board machine and
FIG. 2 shows a view of a preheater like the one in FIG. 1, with the maximal winding angle of the web around the preheating drum.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preheater 1 according to FIGS. 1 and 2 has a heated drum 2 with a smooth surface. This can be internally heated, e.g. by means of steam or in some other way. The drum 2 can be driven in the indicated arrow direction. However, it can also be supported merely so that it can rotate. The drum jacket 3 is comprised of highly heat-conducting material, preferably steel. The drum 2 is supported on both ends in bearing plates 4.
The web 5, e.g. a cover web for a unilateral corrugated board web, travels via an inlet 7, which is embodied, for example,
REFERENCES:
patent: 235698 (1880-12-01), Newton
patent: 2008974 (1935-07-01), Weber
patent: 2487647 (1949-11-01), Goettsch
patent: 3694927 (1972-10-01), Sorenson
patent: 3946800 (1976-03-01), Evans
patent: 5344520 (1994-09-01), Seki et al.
patent: 5389183 (1995-02-01), Seki et al.
patent: 5614048 (1997-03-01), Barny et al.
patent: 5783006 (1998-07-01), Klockenkemper et al.
BHS Corrugated Maschinen und Anlagenbau GmbH
Crispino Richard
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