Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1982-11-16
1985-01-22
Silbaugh, Jan
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264512, 264248, 264254, 264573, 264273, B29C 1707, B29C 1900, B29C 2300, B29D 904
Patent
active
044951345
ABSTRACT:
A flexible tube for use in an endoscope comprises a flexible basic tubular core structure and a homogeneous thermoplastic synthetic resin tube bonded to the outer surface of the tubular core structure to form a coating layer by positioning the synthetic resin tube tightly over the basic tubular core structure with a contact pressure therebetween and heating the synthetic resin tube to a temperature higher than a softening point of the thermoplastic synthetic resin forming the same. A flexible tube having flexibility which varies in a step-wise manner from one end of the tube to the other is obtained by integrally bonding as a whole two or more homogeneous thermoplastic synthetic resin tube sections formed of respective resin materials having different hardnesses to the outer surface of the tubular core structure to form a coating layer in an analogous manner. The ends of adjacent tube sections substantially abut each other and upon heating the tube sections to a temperature higher than a softening point of any one of them, the regions of the respective pairs of abutting tube section ends are heated to a temperature substantially near a melting point of the tube section having the higher melting point to successively fuse the respective pairs of abutting tube section ends together.
REFERENCES:
patent: 2027962 (1936-01-01), Currie
patent: 3276941 (1966-10-01), Burns
patent: 3560295 (1971-02-01), Kimbrell et al.
Ouchi Teruo
Shibuya Hiromichi
Kabushiki Kaisha Medos Kenkyusho
Lorin Hubert C.
Silbaugh Jan
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