Apparatus for making sheets of composite material
View Patent ↗A product sheet of composite material can be made by disposing composite materials of composite material in adjacent (side-by-side) relation with each other. The composite materials comprise fibers in a thermoplastic matrix material. The adjacent composite materials are bonded together to provide a product sheet of composite material. Preferably, a cross ply of composite material is disposed on the composite materials. The cross ply may be a unidirectional sheet and the fibers in the cross ply may be disposed in transverse relation to the fibers in the composite materials.
1. An apparatus for producing a composite laminate, said apparatus comprising:
a first unwind station including at least a first roll support assembly and a second roll support assembly, each roll support assembly configured to rotatably support a roll of composite material, wherein said first unwind station is configured such that when a first length of composite material is drawn from said first roll support assembly and a second length of composite material is drawn from said second roll support assembly the first and second lengths of composite material emerge from said first unwind station in a side-by-side arrangement, said side-by-side arrangement defining a web where the first and second roll support assemblies are laterally spaced to each other along the width of the web;
a tacking station downstream of said first unwind station, said tacking station defining a tacking surface, the tacking station adapted to receive the web, wherein the tacking station is configured to tack said web;
a heating station located downstream of said tacking station, the heating station being adapted to receive and heat said web the heating station comprising an entrance adapted to receive said web, an exit adapted to allow said web to exit said heater; a cover movable between an opened and a closed position; and a heat source for heating said web as it moves between said entrance and said exit; and
a processing station comprising at least one calender roll assembly positioned downstream of said heating station, said processing station adapted to receive said web.
2. An apparatus as defined by claim 1 wherein said at least one calender roll assembly includes a pair of rollers rotatably mounted to a support frame, said rollers defining a nip therebetween so that during operation, said web is fed into said nip such that said rollers exert pressure on said web.
3. An apparatus as defined by claim 2 wherein at least one of said rollers is heated.
4. An apparatus as defined by claim 2 wherein at least one of said rollers is cooled.
5. An apparatus as defined by claim 3 , wherein at least one of the pair of rollers is movable relative to the other of the pair of rollers between a retracted and engaged position; and
wherein said apparatus further includes means for moving at least one of said pair of rollers relative to the other of said pair of rollers between said retracted and engaged positions in response to commands issued from a controller.
6. An apparatus as defined by claim 2 wherein said at least one calender roll assembly includes a first drive means for rotating at least one of said pair of rollers in response to commands issued from a controller.
7. An apparatus as defined by claim 3 further comprising:
at least one roll cover positioned adjacent said at least one roller; and
a roll heater coupled to said at least one roll cover for heating said at least one roller.
8. An apparatus as defined by claim 7 wherein said roll heater includes at least one electric heating element coupled to said cover and responsive to commands issued from a controller so that during operation of said at least one calender roll assembly, at least one roller of the calender roll assembly is heated.
9. An apparatus as defined by claim 4 wherein at least one of said rollers has a flow path therein for the ingress of a thermal transfer fluid therethrough; and
a rotary union for supplying said thermal transfer fluid to said flow path.
10. An apparatus as defined by claim 1 wherein said heat source emits infra red radiation.
11. An apparatus as defined by claim 1 wherein said heat source comprises a plurality of electric heating elements coupled to said cover and operable in response to commands issued from a controller.
12. An apparatus as defined by claim 1 wherein said heat source comprises heated air directed onto said web.
13. An apparatus as defined by claim 1 further comprising:
a second unwind station positioned between said tacking station and said heater, said second unwind station including at least one roll support assembly for rotatably supporting a roll of composite material.
14. An apparatus as defined by claim 1 , comprising a plurality of calender roll assemblies each comprising a pair of rollers rotatably mounted to a support frame, said pairs of rollers each defining a nip there between so that during operation, said web is fed into said nips such that said rollers exert pressure on said composite material.
15. An apparatus as defined by claim 14 including at least one heated calender roll assembly.
16. An apparatus as defined by claim 15 including at least one cooling calender roll assembly.
17. An apparatus as defined by claim 1 wherein said first unwind station includes an unwind frame, and wherein the apparatus includes a plurality of support roll assemblies mounted on said unwind frame; and wherein said support roll assemblies are positioned relative to one another so that during operation, rolls of composite material are unwound from said support roll assemblies such that the composite material from said rolls is positioned edge-to-edge to form a widened sheet of composite material.
18. An apparatus according to claim 1 , further comprising an uptake station positioned downstream of the processing station, the uptake station for winding said web thereon.
19. An apparatus according to claim 1 wherein the web provides at least a lengthwise first layer for a composite laminate.