Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent
1980-04-16
1982-01-26
Swisher, S. Clement
Measuring and testing
Gas content of a liquid or a solid
By vibration
73 17R, 73150R, G01N 3334
Patent
active
043122124
ABSTRACT:
An apparatus is disclosed to simplify the measurement of tack time which is the length of time necessary to heat the prepreg to a tacky condition. A strip of a prepreg specimen is wrapped around an elongated lower support member, and thereafter an upper support member is fixedly connected to the lower support member to secure the prepreg in place. The thickness of the coiled prepreg causes the upper support member to flex upwardly in a bow-like configuration defining a pair of channels between the support members on either side of the coiled prepreg. A head member, having a planar bottom surface, includes a pair of gripping members which are received in the channels between the support members for gripping the prepreg specimen. An electrically controlled air cylinder is provided having a reciprocating piston which is connected to the head member for sequentially moving the prepreg specimen into and out of contact with a heated platen. In use, the prepreg specimen is heated while it is pressed into contact with the platen by the head member, thereby causing the epoxy resin contained therein to melt. The repeated lifting of the prepreg by the reciprocating piston, out of contact with the platen, enables any occurrence of stringiness or tackiness to be observed. An elapsed time counter is provided which measures the interval from the initiation of the test until stringing occurs which corresponds to the tack time of the specimen.
REFERENCES:
patent: 2038622 (1936-04-01), Yeager
patent: 2574715 (1951-11-01), Sontag
patent: 2775888 (1957-01-01), Pickup
patent: 3368398 (1968-02-01), Skewis
General Electric Company
Swisher S. Clement
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