Claims
- 1. An apparatus for the selective lamination of thermoplastic layers by heating and pressurizing the internal surfaces of at least two thermoplastic layers, at least one of said layers including one window portion in which at least one insert is located, said lamination not occurring in said window portion, said apparatus comprising:
- first and second lamination plates, each of said plates defining an opening corresponding to the window portion of said at least one layer;
- a plug inserted in said opening of each plate;
- means for thermally insulating said plugs from said plates;
- means for discontinuously heating said first and second laminating plates, including resistance elements placed in said plates, said resistance elements having a greater packing density in the vicinity of the opening in each plate than in other areas of each plate; and
- means for pressing said plates together with said at least two thermoplastic layers therebetween, whereby said discontinuous heating means heats external surfaces of said layers less at said window portion than at the remainder of said layers.
- 2. The laminating apparatus according to claim 1, wherein said insulating means comprises polyfluoroethylene having a thickness of from 0.5 to 2 mm.
- 3. The laminating apparatus according to claim 2, wherein said plug is comprised of a material having relatively good thermoconductivity and includes means for reducing the temperature of said plug, said temperature reducing means comprising a system of channels through which a cooling agent flows.
- 4. The laminating apparatus according to claim 3 wherein said cooling agent is carbon dioxide gas.
- 5. The laminating apparatus according to claim 1, wherein said plug comprises a removable pressure resistant material of low thermoconductivity.
- 6. The laminating apparatus according to claim 1, wherein said plug is recessed within said opening in said plate by an amount of from 20 .mu.m to 150 .mu.m.
- 7. The laminating apparatus according to claim 1 wherein said discontinuously heating means comprises a laminar resistance layer in each of said laminating plates, each of said layers extending over the laminating plate, said laminar heating layer including means defining an opening in said layer, said opening in said layer coincident with said opening in each of said plates.
- 8. The laminating apparatus according to claim 7, further including an insulating layer interposed between each of said laminar heating layers and said laminating plates.
- 9. The laminating apparatus according to claim 1 wherein at least one of said laminating plates includes means for providing at least a portion of one of said external surfaces with a textured surface.
- 10. The laminating apparatus according to claim 9, wherein said textured surface means further includes means for providing a given geometric arrangement in said textured surface.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2900978 |
Jan 1979 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 111,033, filed Jan. 10, 1980.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2223290 |
Apr 1973 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
111033 |
Jan 1980 |
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