Abstract:
A deep-drawn paper tray made of paper material, a method and an apparatus for manufacturing the tray, and a closed product package comprising the tray. The tray having a bottom and upwardly expanding side walls around the bottom, the side walls of the tray being shaped to expand through a plurality of circumferential steps dimensioned low enough for obtaining wrinkle-free side walls for the tray. The outermost step is a flat, wrinkle-free rim flange, which enables liquid and gas proof heat-sealing of a lid to form the package. The apparatus may comprise upper and lower moulding tools with concentric movable frames for forming the tray bottom and side wall steps from paper blanks, and moulding tools may be mounted onto a rotating turret carrying a paper blank through working stations arranged along the turret circumference, to shape the tray bottom and the side wall steps at the consecutive stations.
Abstract:
The present invention is in the technical field of packages, specifically surfaces of materials used for packages, and the manufacture thereof. According to the present invention, a micropattern is created on at least one surface of a substrate, to obtain a material suitable for manufacturing packages.
Abstract:
The invention relates to use of polylactide (PLA) as an extruded polymer coating on paper or board intended for the production of containers and packages, which are heated in a stove or microwave oven. According to the invention a polyfunctional cross-linking agent, such as trialkyl isocyanureate (TAIC), is blended with PLA, and the extruded coating layer is subjected to cross-linking electron beam (EB) radiation. PLA may be used as such or blended with another biodegradable polyester such as polybutylene succinate (PBS). EB radiation has been found to improve adhesion of the coating to the paper or board substrate, heat-scalability of the coating, and heat-resistance of the finished containers and packages.
Title translation:VERFAHREN ZUR SENKUNG VONSCHMELZVISKOSITÄTUND VERBESSERUNG DER HEISSVERSIEGELBARKEIT VON POLYESTER UND ZUR HERSTELLUNG EINES HEISSVERSIEGELTENBEHÄLTERS
Abstract:
The invention relates to methods for lowering the melt viscosity and thereby improving heat-sealability of a polyester. The invention also relates to a method for manufacturing a heat-sealed container or package from fibrous-based, polyester-coated packaging material, and a method for heat-sealing polyester. The solution according to the invention is subjecting polyester to electron beam (EB) radiation. The lowered melt viscosity allows a lower heat-sealing temperature, and permits sealing of polyester to an uncoated fibrous surface. The preferred polyester for the invention is polylactide, as such or as blended with another polyester.
Abstract:
A method of deoxygenation of tall oil as well as methods for the production of aliphatic hydrocarbons and polymerizable monomers from tall oil. Sulphurous crude tall oil together with hydrogen gas is fed into a reactor comprising a catalyst bed. The oil is catalytically deoxygenated by hydrogen in the bed by use of a sulfided metal catalyst, e.g. a NiMoS catalyst. The flow exiting the reactor is cooled down and a hydrocarbon-bearing liquid phase is separated from a gas phase, followed by subjecting the liquid phase to distillation for removal of useless aromatic hydrocarbons and then to steam cracking to form a product containing olefins such as ethylene or propylene. By regulation of the deoxygenation temperature to be at least 270° C. but less than 360° C. the yield is rich in linear and cyclic aliphates that usefully turn to olefins in the steam cracking, while formation of napthalenes is reduced.
Abstract:
La invención se relaciona con una bandeja de papel de estirado profundo (4) particularmente una bandeja de poca profundidad elaborada de papel o cartón, un método y un aparato para la manufactura de la bandeja mediante técnicas de estirado profundo y un empaque para producto cerrado que comprende la bandeja de la invención, particularmente un empaque para producto hermético a gas y líquido, sellado por calor. La bandeja comprende un fondo (4a) y paredes laterales que se extienden hacia arriba alrededor del fondo, las paredes laterales de la bandeja están conformadas para expandirse a través de una pluralidad de peldaños circunferenciales (4b, 4c, 4d) que tienen un tamaño suficientemente bajo para obtener paredes laterales libres de arrugas para la bandeja. El peldaño más exterior es plano, el reborde de orilla libre de arrugas (4d), el cual permite un sellado por calor hermético al líquido y a gas de una tapa para formar el empaque. El aparato de acuerdo con la invención puede comprender herramientas de moldeo superior e inferior (10, 11) con armazones movibles concéntricos (10b, 10c, 10d) para formar el fondo de la bandeja y los peldaños de pared lateral para preformas de papel, y herramientas de moldeo (10) se pueden montar sobre una torreta giratoria (9) que transporta una preforma de papel a través de estaciones de trabajo distribuidas a lo largo de la circunferencia de la torreta, para conformar el fondo de la bandeja y los peldaños de pared lateral en las estaciones consecutivas.