A glass tube production method includes (1) preparing a tubular glass material, (2) irradiating an outer main surface of the tubular glass material with a laser to form an in-plane void region having a plurality of voids arranged on the outer main surface, and forming a plurality of internal void rows each having one void or two or more voids arranged from the in-plane void region toward an inner main surface of the tubular glass material, and (3) chemically strengthening the tubular glass material having the internal void rows formed therein.

A glass tube production method includes (1) preparing a tubular glass material, (2) irradiating an outer main surface of the tubular glass material with a laser to form an in-plane void region having a plurality of voids arranged on the outer main surface, and forming a plurality of internal void rows each having one void or two or more voids arranged from the in-plane void region toward an inner main surface of the tubular glass material, and (3) chemically strengthening the tubular glass material having the internal void rows formed therein.

The present invention relates to a gastight multilayer composite tube having a heat transfer coefficient of >500 W/m.sup.2/K and comprising at least two layers, namely a layer of nonporous monolithic oxide ceramic and a layer of oxidic fiber composite ceramic, a connecting piece comprising at least one metallic gas-conducting conduit which in the longitudinal direction of the composite tube overlaps in a region at least two ceramic layers, where the one ceramic layer comprises a nonporous monolithic ceramic and the other ceramic layer comprises a fiber composite ceramic, and also the use of the multilayer composite tube as reaction tube for endothermic reactions, radiation tubes, flame tubes or rotary tubes.

The present invention relates to a gastight multilayer composite tube having a heat transfer coefficient of >500 W/m.sup.2/K and comprising at least two layers, namely a layer of nonporous monolithic oxide ceramic and a layer of oxidic fiber composite ceramic, a connecting piece comprising at least one metallic gas-conducting conduit which in the longitudinal direction of the composite tube overlaps in a region at least two ceramic layers, where the one ceramic layer comprises a nonporous monolithic ceramic and the other ceramic layer comprises a fiber composite ceramic, and also the use of the multilayer composite tube as reaction tube for endothermic reactions, radiation tubes, flame tubes or rotary tubes.

A composite chemical vapour deposition diamond (CVDD) focus tube (30, 32, 50) for an abrasive waterjet cutting tool comprises a CVDD tube with a protective ring (55) of superhard material, such as polycrystalline diamond (PCD), CVDD or cubic boron nitride (CBN) at its outlet end. The CVDD tube is encased in a reinforcing material such as a metal or metal alloy, or a plastics material that has set solid in situ. The reinforcing material (38, 51, 81, 91) supports the CVDD tube and in most versions the protective ring, too. The protective ring extends across an outlet face of the composite CVDD focus tube to protect it from abrasive and water reflected back from a workpiece on to the outlet face. The protective ring may be formed as an integral part of the CVDD tube or may comprise a separately formed element mounted to the outlet end of the CVDD tube. The protective ring may be mounted to a former around which the CVDD tube is then formed, or it may be attached by means of the reinforcing material, such as metal deposited by plating.

A composite chemical vapour deposition diamond (CVDD) focus tube (30, 32, 50) for an abrasive waterjet cutting tool comprises a CVDD tube with a protective ring (55) of superhard material, such as polycrystalline diamond (PCD), CVDD or cubic boron nitride (CBN) at its outlet end. The CVDD tube is encased in a reinforcing material such as a metal or metal alloy, or a plastics material that has set solid in situ. The reinforcing material (38, 51, 81, 91) supports the CVDD tube and in most versions the protective ring, too. The protective ring extends across an outlet face of the composite CVDD focus tube to protect it from abrasive and water reflected back from a workpiece on to the outlet face. The protective ring may be formed as an integral part of the CVDD tube or may comprise a separately formed element mounted to the outlet end of the CVDD tube. The protective ring may be mounted to a former around which the CVDD tube is then formed, or it may be attached by means of the reinforcing material, such as metal deposited by plating.

This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with an outer wrap. In one embodiment, a pipe includes an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. The pipe also includes an outer wrap applied to the outer wall. The outer wrap may include fibers and plastic. The outer wrap may span the corrugation crests producing a smooth outer surface.

This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with an outer wrap. In one embodiment, a pipe includes an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. The pipe also includes an outer wrap applied to the outer wall. The outer wrap may include fibers and plastic. The outer wrap may span the corrugation crests producing a smooth outer surface.

A robust, two component adhesive for laminating flexible packaging material comprising a mixture of Component A and Component B. Component A comprises an isocyanate-functionalized compound. Component B comprises a mixture of a high functionality polyol containing at least four hydroxyl groups per molecule with at least two primary OH groups on the molecule and two secondary OH groups on the molecule and a trifunctional polyol containing three OH groups on the molecule. Component B can contain a difunctional polyol containing two OH groups on the molecule. The adhesive is robust and retains desirable properties when used at varying A:B mix ratios better than conventional laminating adhesives used at the same mix ratios.

A cellular glass system for an outer surface of a pipe. An insulation layer surrounds the outer surface of the pipe. The insulation layer has an outer surface and an inner surface and comprises cellular glass. A foam fills an annular space between the outer surface of the pipe and the inner surface of the insulation layer and is configured to limit water intrusion into the annular space and attenuate sound. The system may also include another insulation layer and another foam layer between the two insulation layers.