| 摘要 |
An improved transformer (10) for heating a selected filament during a stretching procedure to enhance the quality and tensile strength of the filament. The transformer (10) is fabricated around a spool body (12) which is mounted on a motor and received within a rotating shield. As power is supplied to the transformer (10), heat is generated, a portion of this heat being transferred to the rotating shield and finally to the selected filament. A base layer of insulation (14) is applied to an exterior surface of the spool body (12), including the flanges (32,38), for preventing generated heat from damaging the spool (12) and also to prevent an inductor wire (18) from shorting on the spool (12). The inductor wire (18) is wrapped from one end of the spool body (12) to the other. During the wrapping of the inductor wire (18), an insulating material (20) is sprayed on to fill any voids between the wire (18) and the spool (12), and between the individual turns of the inductor wire (18). A selected number of layers of inductor wire (18) is wound on the spool (12). Between each layer of inductor wire (18) is applied a selected insulation material (22). A layer of insulating fabric (24) is applied after the final layer of inductor wire (18). A final coat of insulating material (20) is then applied.
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