Method for producing a tube or semi-finished tube and tube or semi-finished tube for chemical apparatus construction

A tube or semi-finished tube, in particular for chemical apparatus construction, for storing or for transporting aggressive storage media, comprising

• a solid inner tube with the inner side of which the storage medium can come into contact and which is made of a thermoplastic that is chemically resistant to the storage medium, and comprising
• an adhesion-promoting layer applied to the outer side of the inner tube, which has a textile structure and is made of a thermoplastic, the textile structure of the adhesion-promoting layer being suitable for mounting a support tube on the outer side of the adhesion-promoting layer,
• wherein the outer side of the inner tube and the inner side of the adhesion-promoting layer are welded together in a material-bonded manner, the textile structure being preserved on the outer side of the adhesion-promoting layer,
• wherein the adhesion-promoting layer is formed by a textile material strip that is wound or rolled onto the outer side of the inner tube or by a covering material hose,
• wherein the inner tube comprises at least two coextruded material layers made of a thermoplastic, the at least two coextruded material layers comprising at least an inner material layer and an outer material layer,
• wherein the thermoplastic of the outer material layer of the inner tube has a lower viscosity than the thermoplastic of the inner material layer of the inner tube.