METHOD OF INJECTION MOLDING OPENING DEVICES ON SHEET MATERIAL FOR PACKAGING POURABLE FOOD PRODUCTS, AND PACKAGING MATERIAL AND PACKAGE OBTAINED THEREBY

• Main Authors: KANEKO MASAMICHI, DAMKJAER NIELS, MARTINI PIETRO
• Format: Patent
• Language: English; Korean
• Published: 12.03.2010
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method of injection molding an opening device (3) on sheet packaging material (2) for packaging pourable food products; the packaging material (2) has at least a first (4) and a second (5, 6) layer, and an opening (9) formed through the first layer (4) and sealed by a cover portion (10) of the second layer (5, 6); the method includes the steps of injecting molten plastic material onto a first side (10a) of the cover portion (10) of the second layer (5, 6), feeding the molten plastic material along the cover portion (10) to cover it on the first side (10a), and feeding the molten plastic material through an annular peripheral portion of the cover portion (10) to form a spout (12) of the opening device (3) projecting from a second side (10b), opposite the first side (10a), of the cover portion (10); the molten plastic material covers the cover portion (10) to define, with the cover portion (10), a user-removable sealing portion (15) of the spout (12).