Robert E. Ailinger,James J. Frassica,Richard M. Andrews,Hiroaki Miyoshi
申请号：
US14974752
公开号：
US09538904B2
申请日:
2015.12.18
申请国别(地区):
US
年份:
2017
代理人:
摘要：
A spiral unit includes a base tube extended along a longitudinal axis and made of a first thermoplastic resin, and a fin disposed on an outer peripheral surface of the base tube along a fin axis spirally extended around the longitudinal axis and made of a second thermoplastic resin. The fin includes a strip portion provided in a state of being bonded to the outer peripheral surface of the base tube and spirally extended along the fin axis. The second resin being mixed with a magnetic material in the strip portion.
