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Browse Prior Art Database

Pre Preg Flow Tester

IP.com Disclosure Number: IPCOM000075493D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Wiley, JP: AUTHOR

Abstract

This test device permits direct measurement of pre-preg flow characteristics under transient temperature conditions. Use of this test device is not limited to glass cloth filled pre-pregs but can be used with any B-stage film.

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Pre Preg Flow Tester

This test device permits direct measurement of pre-preg flow characteristics under transient temperature conditions. Use of this test device is not limited to glass cloth filled pre-pregs but can be used with any B-stage film.

The tester includes a removable pad 1 maintained at a constant, elevated temperature and a temperature control slug 2 initially at room temperature. The temperature control slug is of a material that provides the desired time- temperature curve. Mandrel 3 is fastened to the temperature control slug. A second mandrel 4 is fastened to capstan 5 supported on shaft 6 in bearing 7. A transducer 8 is fastened to the shaft. The output from the transducer is fed to recorder 9. A constant torque is applied to the capstan via weight 10.

The sample pre-preg 11 to be measured is placed between the two mandrels. The upper mandrel 3 is attached to an appropriate temperature control slug for the desired temperature profile. The heated pad 1 is then placed on top of the temperature control slug 2 and is constrained from rotation. Sufficient weight is added to the assembly to prevent initial rotation, and the weight 10 is released, thus applying torque to the sample. As the resin softens, the mandrel will turn and rotation will continue until the resin is gelled or partly cured. The rotational displacement is recorded with respect to time, to measure the flow properties of the resin pre-preg combination. The average velocity of the mand...