Composite Paperboard Container With A Rim Comprising Fibers, And A Method For Producing Such A Container
AssigneeGPI Systems AB
InventorsMaximillian Lundgren-Goodman, Georg Gezelius
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Abstract
The present disclosure relates to a composite paperboard container for bulk solids having a tubular body being closed at a bottom end over a container bottom opening opposite a container top opening at a top end. The rim is attached at a connecting portion of the rim to an end portion of the tubular body along an end edge of the tubular body. The connecting portion of the rim has a distal edge. The rim is a molded rim comprising pulp fibers. The tubular body is connected by welding to the connecting portion of the rim and the distal edge of the rim is located at a distance from the end edge of the tubular body.
Claims15
A composite paperboard container for bulk solids, the composite paperboard container comprising a tubular body being closed at a bottom end over a container bottom opening opposite a container top opening at a top end of the tubular body, the tubular body having an inner surface facing towards an interior of the container body and an outer surface facing away from the interior of the container body, the tubular body extending in a longitudinal direction, the composite container comprises a rim surrounding one of the container top opening and the container bottom opening, the rim being attached at a connecting portion of the rim to an end portion of the tubular body along an end edge of the tubular body, the connecting portion of the rim has a distal edge, the tubular body being made from a laminate sheet material comprising a carton substrate layer and a thermoplastic welding layer, wherein the rim is a molded rim comprising pulp fibers, the tubular body is connected by welding to the connecting portion of the rim and the distal edge of the rim is located at a distance from the end edge of the tubular body of at least 4 mm as seen in the longitudinal direction of the tubular body.
A method of producing a composite paperboard container for bulk solids, the method comprising the steps of;
- a) bending a paperboard laminate sheet material comprising a carton substrate layer and a thermoplastic welding layer into a tube, the tube having a longitudinal direction, a radial direction perpendicular to the longitudinal direction, closing the tube in the longitudinal direction by joining overlapping or abutting side edges of the paperboard material thereby forming a tubular body, the tubular body having an inner surface facing towards an interior of the tubular body and an outer surface facing away from the interior of the tubular body;
- b) imparting a predetermined cross-sectional shape to said tube;
- c) closing the tubular body at a bottom end over a container bottom opening opposite a container top opening at a top end of the tubular body;
- d) providing pulp fibers into a molding tool thereby forming a three-dimensionally shaped rim component comprising pulp fibers, the rim comprising a connecting portion having a distal edge;
- e) providing the rim to an end portion of the tubular body along an end edge of the tubular body so that the rim surrounds one of the container top opening and the container bottom opening, such that that the distal edge of the rim connecting portion is located at a distance from the end edge of the tubular body within the range of at least 4 mm as seen in the longitudinal direction of the tubular body;
- and
- f) attaching the connecting portion of the three-dimensionally formed container component to the end portion of the tubular body by welding, thereby forming the composite paperboard container.
Dependencies are inferred from the claim text.