US 4,290,838 A · Method for vacuum lamination of flex circuits

Abstract

A vacuum laminating fixture includes a pair of opposed plates having opposed plane faces with a peripheral groove formed in each plate surrounding the face with the grooves matched for receiving a unitary band seal extending between the grooves for sealing the space between the faces of the plates, a vacuum port is formed in the lower plate communicating with the area of the face inside the peripheral groove. The method includes setting up a laminate of plural flexible sheets of circuit, placing the laminate within and between the faces of the plates, drawing a vacuum of 28 inches of mercury for a period of two minutes to completely evacuate the space between the laminate sheets, and thereafter applying a predetermined curing pressure and temperature to the plates within a press.

Claims5

Dependent claims

A method of laminating printed circuits comprising:

selecting a sealable press fixture having opposed plates defining upper and lower planar faces and including a peripheral band seal extending between the plates;
forming a laminate of flexible sheets of circuits with an adhesive between said sheets;
placing the laminate of circuits between said plates in said fixture for engagement thereby;
closing said fixture;
applying a vacuum in the fixture for drawing air from between said sheets of circuit while supporting the face of said upper plate out of engagement with said laminate;
maintaining the vacuum for predetermined period of time;
and
applying pressure to the press fixture for forcing the laminate to bond together.

5 more elements

Dependencies are inferred from the claim text.

Method for vacuum lamination of flex circuits

Life of this patent

Method for vacuum lamination of flex circuits

Life of this patent

Abstract

Claims5