Multiple layer hose, method of producing a multiple layer hose and apparatus therefor

Abstract

In one aspect the present invention provides a multilayer hose comprising an inner layer surrounded by a first layer of reinforcement material around which is formed a second layer of reinforced material and over which is placed an outer cover, in which the two reinforcement layers have an intermediate layer of elastomeric material applied as a water-based emulsion. In another aspect of the invention there is a method of producing a multilayer hose of the type comprising internal and external flexible resilient layers between which is located a reinforcement layer, in which inner and outer reinforcement layers have an intermediate bonding layer; the said method comprising the steps of: providing a first reinforcement layer over the said internal flexible resilient layer; applying a water-based elastomeric emulsion over the said first reinforcement layer to form an intermediate layer; drying the said water-based emulsion to reduce the moisture content thereof; providing a second reinforcement layer over the said elastomeric layer and subsequently curing the said elastomeric layer to bond the two reinforcement layers together.

Description

FIELD OF THE INVENTION [0001] This invention relates to a multilayer hose, method of producing such a hose and an apparatus therefor, and in particular concerns a flexible hose suitable for use in high pressure hydraulic systems such as vehicle braking systems and the like. BACKGROUND OF THE INVENTION [0002] Multilayer hydraulic hoses usually comprise an inner layer of elastomeric material surrounded by a first braided layer of filamentary material around which is formed a second braided layer of filamentary material over which is placed an elastomeric outer layer. In many embodiments the elastomeric material of the inner and outer layers is rubber and the braided filamentary material is rayon. The first and second rayon layers act as a reinforcement for high-pressure fluid application. [0003] A problem associated with hoses of the above mentioned type is that relative movement between the first and second layers of the braided material can cause degradation of the braided layers ov...

AI Technical Summary

Benefits of technology

[0005] The intermediate layer between the layers of reinforced material provides a tougher and longer life hose since the intermediate layer reduces movement between the layers of reinforcement material. The hose of the above aspect of the invention can be produced in a cost effective manner and environmentally conscious way compared with more traditional methods using solvent based rubber.

[0021] The combined drying processes, that is during interleaf application, and prior to application of the outer cover and subsequent vulcanisation, reduces the moisture content to a level where it has no affect on the finished product.

Problems solved by technology

A problem associated with hoses of the above mentioned type is that relative movement between the first and second layers of the braided material can cause degradation of the braided layers over time.

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