Laminating mechanism for producing a laminated composite

Details Laminating mechanism for producing a laminated composite Laminating mechanism for producing a laminated composite

1998-11-30

2000-12-26

Aftergut, Jeff H.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With work feeding or handling means

156324, B32B 3100

Patent

active

061643602

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention concerns a method of producing a laminated composite comprising at least one core layer with at least one covering layer, the layers to be interconnected being assembled in the form of strips and being acted upon with the desired laminating pressure between laminating rollers in the roll gap by adjustment of the gap height. Also within the scope of the invention is a laminating mechanism suitable for carrying out the method.
2. Discussion of the Prior Art
In the conventional roll laminating of one or more core layers with single or double sided covering layers to produce laminated composites, such as e.g. plastic cores clad with metal sheets, the layers to be joined together are assembled as strips and subjected to the desired laminating pressure in the roll gap between two rollers. As the laminating can take place only in the roll gap and the laminating zone is consequently very short, with conventional two roll laminating facilities only a small amount of heat can be introduced into the composite, which results in a slow rate of manufacture. An increase in production rate can be obtained using a double strip press. The investment requirements for such a press are, however, very much higher than for a roll-laminating facility.


SUMMARY OF THE INVENTION

With the state of the art methods in view it is the object of the present invention to provide a cost favourable method of the kind mentioned at the start, by means of which the rate of production compared with conventional roll-laminating mechanisms can be improved considerably.
A further objective of the invention is the provision of a suitable laminating mechanism for carrying out the method.
The objective with reference to the method is achieved by way of the invention in that the laminated composite emerging from a first roll gap wraps partially round the roll and is passed through at least one further roll gap.
The laminating rollers are preferably driven individually and, usefully, can also be heated individually. In order to increase the force of compression during the wrapping round stage, at least one outer layer can be braked before it enters the first roll gap. This manner of increasing the compressive force is suitable in particular when manufacturing technical grade laminates with high tensile strength outer layers of e.g. aluminium, steel or tear resistant woven materials. On applying a tensile force by pulling the outer layer and deflecting it, a compressive force is applied to the laminating roll. By subsequently wrapping it round part of the roll, the composite laminate is in contact with the roll for a longer length of time, which is necessary for a higher rate of production. Any necessary laminating pressure is produced as the laminate passes through the roll gaps, the height of which is adjusted according to the pressure to be created.
The outer layers and/or the core layers may be heated already before they enter the first roll gap by being partially wrapped round the laminating rollers. This way a partial composite can be formed e.g. an outer layer and a neighbouring core layer, before entering the first roll gap.
The minimum diameter of laminating rollers is chosen such that the outer layers do not exceed their elastic limits in the composite on being deflected or partially wrapped round the rollers, this in order that the curvature of the rolls which is transferred to the product can be removed.
A laminating mechanism suitable for performing the process according to the invention features at least three laminating rollers arranged in series such that one roll forms two roll gaps with two neighbouring rolls.
In a simple, cost favourable laminating mechanism three rollers are arranged approximately in the shape of an L. The laminating rollers, usefully mounted in a frame that allows them to be inclined or tilted, may e.g. be mounted in a frame that can be inclined or tilted via a counter set spindle. Of course, the laminating rollers may also be arranged such that

REFERENCES:
patent: 4248652 (1981-02-01), Civardi et al.
patent: 4498946 (1985-02-01), Schollkopf et al.
patent: 5158831 (1992-10-01), Schirmer
patent: 5192388 (1993-03-01), Schollkopf et al.
patent: 5429696 (1995-07-01), Rohleder et al.
patent: 5466403 (1995-11-01), Nissel

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