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US 5,435,878 AGranted
Method for welding polycarbonate by high frequency
AssigneeGemplus S.C.A.
InventorsJean-Claude Delmar, Christian Schmuckle
Life of this patent
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Abstract
The invention relates to a method for welding thermoweldable sheets of which at least one is made of polycarbonate. The method is characterized in that the sheets to be welded are separated from the metal electrodes (4,5) of the high frequency press by means of a glass plate (2,3). Application to the fabrication of high density magnetic cards.
Claims19
A method for welding heat-weldable sheets, wherein at least one of the sheets is made of polycarbonate, comprising the steps of:
- (1) superimposing said heat-weldable sheets to form a sandwich;
- (2) introducing said sandwich between two metal electrodes of a high frequency press;
- (3) pressing said sandwich in the high frequency press and applying a frequency of 25-30 MHz, wherein said pressing and applying is through two glass plates each cooperating with a metal electrode of said high frequency press to heat-weld said sheets, and
- (4) cooling said heat-weldable sheets under pressure in a press which is different than said high frequency press.
1 more element
A method for welding heat-weldable sheets, wherein at least one of the sheets is made of polycarbonate, comprising the steps of:
- (1) superimposing said heat-weldable sheets to form a sandwich;
- (2) introducing said sandwich between two metal electrodes of a high frequency press;
- (3) positioning said sandwich between two glass plates each cooperating with a metal electrode of said high frequency press;
- (4) positioning a sheet of flexible material between said metal electrodes and said glass plates;
- (5) pressing said sandwich in the high frequency press and applying a frequency of 25-30 MHz, wherein said pressing and applying is through said glass plates and said flexible material to heat-weld said sheets;
- and
- (6) cooling said heat-welded sheets under pressure in a press which is different than said high frequency press.
4 more elements
Dependencies are inferred from the claim text.