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Test to Measure Interlaminar Adhesion

IP.com Disclosure Number: IPCOM000059695D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Darekar, VS: AUTHOR [+2]

Abstract

Multilayered printed circuit boards are constructed by stacking circuitized epoxy glass laminae with layers of prepreg and then subsequently curing, under specific pressure and temperature, to make a solid composite board. The adhesion between the individual laminae depends on many operations in manufacturing which must be closely controlled in order to achieve good adhesion and avoid problems. The proper evaluation of the laminate strength at each step of construction is necessary to ensure the quality of the composite. A testing technique that quantitatively determines the bond strength between the laminae by either pulling them apart or shearing them is as follows: A test sample 1 (Fig.

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Test to Measure Interlaminar Adhesion

Multilayered printed circuit boards are constructed by stacking circuitized epoxy glass laminae with layers of prepreg and then subsequently curing, under specific pressure and temperature, to make a solid composite board. The adhesion between the individual laminae depends on many operations in manufacturing which must be closely controlled in order to achieve good adhesion and avoid problems. The proper evaluation of the laminate strength at each step of construction is necessary to ensure the quality of the composite. A testing technique that quantitatively determines the bond strength between the laminae by either pulling them apart or shearing them is as follows: A test sample 1 (Fig. 1) is prepared of a piece of TEFLON* tape, approximately one square inch, that is placed at one corner of the product to be tested and in between lamina 2 and prepreg 3. Lamina 4 is placed on top. The layers are then laminated in the standard manner. After lamination (Fig. 2), the TEFLON 1 with the adjacent laminae layers 5 (layers 2, 3, 4 in Fig. 1 before lamination) is cut from the area where the TEFLON sheet was sandwiched and at the same size as the TEFLON sheet (approximately 1" square). Specially constructed square steel blocks 6 (Fig. 2) (without studs) are cemented by a suitable adhesive on both sides of the 1" square sample and allowed to dry. In the pull test, the sample 5 has studs 7 (Fig. 3) inserted into steel blocks 6 and stud...