HEAT-SEALABLE BIODEGRADABLE PACKAGING MATERIAL, A METHOD FOR ITS MANUFACTURE, AND A PRODUCT PACKAGE MADE FROM THE MATERIAL

• Main Authors: KUUSIPALO, JURKKA, NEVALAINEN, KIMMO, PENTTINEN, TAPANI, KOSKINEN, TAPIO, KOTKAMO, SAMI
• Format: Patent
• Language: English; French
• Published: 24.01.2017
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; ADHESIVES; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; 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; CORRECTING FLUIDS; DYES; FILLING PASTES; HANDLING THIN OR FILAMENTARY MATERIAL; INKS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention relates to a heat-sealable biodegradable packaging material, its manufacturing method and a product package formed thereof. The packaging material comprises a fibre substrate (1 ), an inner polymeric coating layer (2) against the same, which contains polylactide and a biodegradable polyester that is blended therewith to improve the adhesion between the layer and the fibre substrate, and an outer coating layer (3) that constitutes the outer surface of the material and contains polylactide and a biodegradable polyester that is blended therewith to improve the heat sealing ability of the layer, the portion of polylactide in the inner layer (2) being higher than that in the outer layer (3). The inner and/or outer coating layers (2, 3) can further have blended therewith a small amount of acrylic copolymer that improves the adhesion and/or heat sealing ability. The coating layers can be introduced onto the fibre substrate by extrusion or coextrusion. L'invention porte sur un matériau d'emballage thermoscellable et biodégradable, sur son procédé de fabrication, et sur un emballage en étant fait. Le matériau d'emballage comprend: un substrat de fibres (1 ); une couche de revêtement intérieure de polymères (2) jouxtant le substrat et contenant un polylactide et un polyester biodégradable mélangé avec pour améliorer l'adhésion entre la couche et le substrat de fibres; et une couche de revêtement extérieure (3) constituant la surface extérieure du matériau et contenant un polylactide et un polyester biodégradable mélangé avec pour améliorer la capacité de thermoscellement de la couche, la proportion de polylactide dans la couche intérieure (2) étant plus élevée que dans la couche extérieure (3). Les couches de revêtement intérieure et extérieure (2, 3) peuvent en outre être mélangées à une petite quantité de copolymère acrylique qui améliore l'adhésion et la capacité de thermoscellement. Les couches de revêtement peuvent être déposées sur le substrat de fibres par extrusion ou coextrusion.