Abstract A method for laminating a composite assembly having outer films of plastic to provide such a composite assembly without appreciable transverse curl. The method includes the steps of preparing two oppositely facing outer films which may be of bi-axially oriented plastic. Each film may have an outer layer of a tough abrasion resistant material and an inner layer of thermoplastic bonding resin. In one embodiment, a portion of the inner layer of thermoplastic bonding resin may be coated with a strip of electrically conductive material. The inner layers of thermoplastic bonding resins are heated and the films are brought together in a common plane. In one embodiment, a central core is inserted between the converging films at spaced intervals. The outer films and the central core are laminated by passing them between first and second pairs of pressure rolls. The first and second pairs of pressure rolls are tilted at equal and opposite angles to the plane of the films.
A method for laminating a composite assembly having films of plastic to provide such a composite assembly without appreciable transverse curl, the method including the steps of: preparing two oppositely facing films, each having an outer layer of a tough abrasion resistant material and an inner layer of thermoplastic bonding resin, heating the inner layers of thermoplastic bonding resins of the films, bringing the films together in a common plane, laminating the films by passing them between first and second pairs of pressure rolls, the first set of pressure rolls being tilted at an angle relative to the common plane of the films, and the second set of pressure rolls being tilted relative to the common plane of the films an equal amount in the opposite direction of tilt of the first set of rolls.
Claim 2
Independent Claim
135 words
A method for laminating a composite assembly having films of plastic to provide such a composite assembly without appreciable transverse curl, the method including the steps of: preparing two oppositely facing films, each having an outer layer of a tough abrasion resistant material and an inner layer of thermoplastic bonding resin, heating the inner layers of thermoplastic bonding resins of the films, bringing the films together in a common plane, laminating the films by passing them between first and second pairs of pressure rolls, the first set of pressure rolls being tilted at an angle relative to the common plane of the films, and the second set of pressure rolls being tilted relative to the common plane of the films an equal amount in the opposite direction of tilt of the first set of rolls.
Claim 3
Dependent Claim
26 words
The method of claim 1 including the step of: inserting at spaced intervals, central cores between the converging films to laminate the cores and the films.
Claim 4
Dependent Claim
14 words
The method of claim 1 in which the films are of bi-axially oriented plastic.
Claim 5
Dependent Claim
27 words
The laminating method of claim 2 in which each central core is an elongated piece of high density plastic foam which is narrower than the outer films.
Claim 6
Dependent Claim
28 words
The laminating method of claim 2 in which a portion of the inner layer of each outer film is coated with a graphite electrically conductive strip before lamination.