ADHESIVE TUBE, COMPOSITE TUBE AND SEAL METHOD USING THEM

• Main Authors: MATSUFUJI SHIGEO, KISHIMOTO TOMOYOSHI
• Format: Patent
• Language: English
• Published: 10.09.1996
• Edition: 6
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BASIC ELECTRIC ELEMENTS; BLASTING; CABLES; CONDUCTORS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINEDOPTICAL AND ELECTRIC CABLES OR LINES; INSULATORS; JOINTS OR FITTINGS FOR PIPES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PIPES; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE: To enhance outer diameter dimension accuracy in a length direction, workability and quality by making the melt index of the outer layer of two thermoplastic resin layers less than that of the inner layer thereof. CONSTITUTION: An adhesive tube 10 consists of two thermoplastic layers and the melt index of the outer layer tube 12 thereof is made less than that of the inner layer tube 11 thereof. In case of a composite tube, the adhesive tube 10 is laminated to the inside of a heat-shrinkable tube 20. The thermoplastic resin of the adhesive tube is set to polyethylene, an ethylene/vinyl acetate copolymer or an ethylene/ethyl acrylate copolymer. By using thermoplastic resins wherein the melt index of the outer layer tube is less than that of the inner layer tube, a tube high in outer diameter accuracy in its longitudinal direction can be obtained by co-extrusion molding. The composite tube wherein the inner diameter of the innermost layer is 0.7mm or more and the outer diameter of the heat-shrinkable tube is 1.3mm or more can be obtained.