| 摘要 |
A reinforced flexible hose comprises a reinforcement element (2) made of a relatively rigid plastic material, such as rigid PVC, totally immersed into one tubular layer (3) made of a plastic material containing plastifying substances, such as flexible PVC. The reinforcement element (2) is a spirally shaped plastic thread ribbon with its minimum diameter longer than the inner diameter of the tubular layer wherein it is immersed and it is coated with a film (4) made of a relatively thin plastic material forming a barrier against plastifying substances contained in the tubular layered (3) material, in such a way that any migration of these plastifying substances is always prevented, along with the consequent embrittlement and cracking phenomena involving the reinforcement element (2). The material making up the film (4) is chosen to be such that it steadily adheres both to the flexible layer (3) and to the rigid reinforcement element (2). The basic material making up the film (4) is preferably chosen in the group comprising polyamides, polyesters, polyurethane, polyketone, polyethylene copolymers and nitrile rubber.
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