B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/770, 18/784
B29D 23/12 (1980.01)
Patent
CA 1097874
ABSTRACT A strip is provided for forming a flexible hose having resistance to radial crush from bonded and interlocked helically wound convolutions of the strips which is formed as a plastic co-extrusion. The co-extruded pro- file of the strip is defined by a pair of matable rib components which are joined by a web. The rib components are to be bonded, sealed and interlocked together at adjoining convolutions of the profile not only to form the hose but also to form a composite rib integrated into the hose for resisting radial crushing and axially directed deformation forces exerted on the hose. The composite rib is formed from a material having a hardness which is greater than that of at least a part of the web for rendering the rib with a relative- ly stiff bend resistance characteristic and the web with a relatively soft and flexible characteristic. The web itself may be a co-extrusion of two materials placed in series, or in parallel as a laminate, or a combination thereof. If a laminate, one of its materials may be the same as that of the rib but much thinner so as to provide a larger surface area for greater bond- ing or adhesion among the several parts of the extruded profile. Different materials, especially in a laminate, enable the hose to be tailored for spe- cific uses and environments which come into contact with either or both the inside and outside of the hose.
349936
Plastiflex Company International
Smart & Biggar
LandOfFree
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