APPARATUS AND METHOD FOR PRODUCING A MULTI-LAYERED ARTICLE SUCH AS A PARISON E.G. FOR MAKING A BLOWMOULDED CONTAINER

• Main Authors: BRIGGS, JERALD E, PFEUTZENREUTER, HENRY
• Format: Patent
• Language: English
• Published: 21.09.1988
• Edition: 4
• 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; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING GRANULES OR PREFORMS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; 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 multi-layer laminate structure from which containers are injection blow moldable, includes a layer of scrap (111) composed of the other thermoplastic resins used in making the laminate structure, which comprises outer and inner polyolefin layers (103, 105) an intermediate oxygen barrier layer (107), preferably ethylene-vinyl alcohol copolymer, and adhesive layers (109, 113) bonding the barrier layer to the inner layer (105) and the scrap layer (111) which is interiorly of the outer polyolefin layer. Apparatus (1) for producing parisons having such a structure has a sequence of extruder elements (3,4, 5) which discharge polymeric materials in turn into a common duct (42) to form a laminate composed of a plurality of thin polymeric layers, said duct conveying the laminate to a principal delivery channel (40) for joining with a relatively thick polymeric layer flowing in the principal delivery channel (40) from another extruder element (7) upstream of the said elements (3,4,5); the resulting structure thereafter issues as a parison from a nozzle (23) of the apparatus (1).