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Method for Improving Adhesion between Inner Layer and Outer Layer of Formed Hoses by Curing Under Pressure

IP.com Disclosure Number: IPCOM000231560D
Publication Date: 2013-Oct-07
Document File: 1 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for improving adhesion between inner layer and outer layer of formed hoses by curing under pressure.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 75% of the total text.

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Method for Improving Adhesion between Inner Layer and Outer Layer of Formed Hoses by Curing Under Pressure

Formed rubber hoses have an inner layer and an outer layer with knitted reinforcement between the inner layer and the outer layer. The inner layer together with the reinforcement stops the water from leaking out and dictates pressure rating of the rubber hose. The outer layer protects the reinforcement.

In case adhesion between the inner layer and the outer layer is poor, any rupture in the inner layer allows the water to leak out of the inner layer and cause the outer layer to balloon and rupture. The outer layer, which has no reinforcement, cannot withstand much pressure.

The method disclosed herein improves the adhesion between the inner layer and the outer layer, thereby making the formed hose more robust. As a result, the formed hose is less apt to leak even if there is rupture in the inner layer.

In accordance with the method, the adhesion of the inner layer and the outer layer of a formed hose is improved by pressing the inner layer and the outer layer together during rubber curing step of the manufacturing process.

In an exemplary implementation, rubber layers at the two ends of the formed hose can be pressed together on to a rigid mandrel using hose clamps. The hose clamps seals space between the inner layer and the outer layer and the space between the inner layer and the rigid mandrel. The formed hose can then be placed in an autoclave, which can...