Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1993-03-16
1994-09-13
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156293, 156 622, 156296, 310 43, 310 45, 310215, 428413, H02K 104, H02K 1502, H02K 1512
Patent
active
053465687
ABSTRACT:
A thermally expanding laminate contains highly elastic reinforcing fibers, such as glass fibers, in the elastically compressed state, and a thermally softening, thermosetting plastic as a binder.
In order to manufacture this laminate, first glass fiber mats are impregnated with a thermosetting plastic and thereupon one or more superposed mats are compressed in a press and raised to temperatures such that the plastic shall soften and the assembly then is cooled while still being compressed and while the plastic is solidifying to form the finished laminate.
The expandable laminate preferably is used for electrically insulating spacers. Illustratively a laminate blank 4 is mounted between neighboring coil parts 5 of a stator of an electrical high-voltage machine. In the ensuing vacuum-pressure molding, which is conventional per se, of the stator to complete the soil insulation, the laminate blanks 4 are heated by the hot impregnation-soaking medium, the plastic of the laminate blanks being softened and these blanks then expand on account of the decompression of their compressed fiber material and entirely fill the gaps between the coil parts 5. The soaking medium totally filling the laminate pores then is jointly cured with the plastic of the laminate with the stator insulation.
REFERENCES:
patent: 3621092 (1971-11-01), Hofer
patent: 3759734 (1973-09-01), Mendelsohn et al.
patent: 4654100 (1987-03-01), Yats et al.
patent: 4724600 (1988-02-01), Studniarz et al.
patent: 4775580 (1988-10-01), Dighton
Aftergut Jeff H.
Isovolta Osterreichische Isolierstoffwerke Aktiengesellschaft
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