G - Physics – 01 – N
Patent
G - Physics
01
N
73/99
G01N 33/44 (2006.01) G01N 25/04 (2006.01)
Patent
CA 1119833
-1- ABSTRACT EPOXY RESIN GEL TESTER A method of and apparatus for determining the gel point of a sample of epoxy resin. The sample is prepared by grinding it into a fine powder and placing it into a sample tube of aluminum foil. The prepared sample is inserted into the test pressure sensor which is located within a preheated laboratory environmental chamber. The test pressure sensor consists of two knurled cylinders each rotatably mounted about its axis wherein the axes are parallel and the plane of the two axes is horizontal. The two knurled cylinders are slowly rotated by a small electric motor such that when viewed in a direction parallel to their axes, the cylin- der on the left rotates in a clockwise direction and the cylinder on the right rotates in a counterclockwise direction. The axis of one of the cylinders is fixedly mounted. The axis of the other cylinder is slidably mounted within the horizontal plane of the two axes. A spring tends to force the axis of the slidably mounted cylinder toward the axis of the fixedly mounted cylinder. A set of electric contacts can measure when the two cylinders are within or without a given distance. The prepared sample becomes liquid within the aluminum foil sample tube, and the two are drawn into the nip of the cylinders by their rotation. The cylinders continue to rotate slowly, collapsing the sample tube within the nip of the cylinders causing the liquid resin to be displaced above the nip of the cylinders within the sample tube. When the prepared sample becomes a plastic wedge, signi- fying the gel point, it is drawn into the nip of the cylinders forcing them sufficiently apart to be measured by the set of electric contacts. A timer records the number of seconds between the insertion of the sample and the gel point.
353034
Kirby Eades Gale Baker
Sperry Corporation
LandOfFree
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