Abstract:
A gumming roll preferably for use with apparatus for applying gum to blanks and pertains has gear driven rollers and the rollers are in skidding contact for returning excess adhesive to an adhesive pan without substantial foaming of the adhesive. The gumming apparatus speed of operation is greater than the conventional apparatus in which adhesive foaming is a problem.
Abstract:
Apparatus for folding blanks particularly those constructed from corrugated cardboard. As a blank advances along a paper line pathway, a first station engages the leading edges of the blank flaps and forces the flaps into an intermediate plane. A second station controls the relative velocity of the flaps along the paper line with respect to the panels to compensate for skew that can occur at other stations. A final station completes the folding operation. The second station includes driven rollers that engage opposite sides of each of the flaps. Independently controlled motors drive these rollers in response to the velocity of the blanks along a paper line pathway and any required offset for skew compensation. The controls can be remotely located from the station. Moreover, the station can accommodate blanks of different thicknesses, position the rollers at different locations on different flaps and accommodate cartons with different widths.
Abstract:
Folded paperboard food cartons having a polymer coating only on the interior surface and sales graphics on a substantially unplasticized clay coated exterior surface are heat sealed at contiguous areas of overlapping flaps wherein the polymer coated interior surface is in direct contact with a small portion of the clay coated exterior surface, or where it is desired to secure together two portions of the clay coated exterior surface. In such heat sealing areas, small and accurately located exterior clay coated carton surface areas are primed with a water based polymer emulsion such as ethylene vinyl acetate that is precisely applied to such areas by a printing press.
Abstract:
Folded paperboard food cartons having a polymer coating only on the interior surface and sales graphics on a substantially unplasticized clay coated exterior surface are heat sealed at contiguous areas of overlapping flaps wherein the polymer coated interior surface is in direct contact with a small portion of the clay coated exterior surface or, where it is desired to secure together two portions of the clay coated exterior surface. In such heat sealing areas, small and accurately located exterior clay coated carton surface areas are primed with a water based polymer emulsion such as ethylene vinyl acetate that is precisely applied to such areas by a printing press.
Abstract:
A modified glue flap of a folding carton blank for preventing glue from being squeezed out during the step of adhering the glue flap to the opposite end panel. The face of the glue flap engaged by the glue back-up wheel includes a protrusion near the trailing edge of the flap. Engagement of the protrusion by the back-up wheel causes the glue wheel to skip the trailing area of the flap. The absence of glue in this area prevents glue from being squeezed out when sealing pressure is subsequently applied to the glue flap and the opposite end panel. The protrusion may take the form of an embossed ridge, forming a channel on the opposite side of the protrusion for receiving any excess glue which would have been squeezed out.
Abstract:
A paperboard tray forming machine is disclosed which is designed for forming a paperboard tray from a flat production blank. The paperboard tray has front and rear end panels hingedly attached to side panels by means of folded gusset corner panels. The tray further has folded over corner flaps hingedly attached to the gusset panels and upwardly turned top flaps hingedly attached to the front and rear end panels. The machine is formed in a plurality of stations designed to take a paperboard flat production blank from a hopper and to fold the tray into the finished shape through a series of folding and glueing stations in the machine. The path of travel through the machine is in a generally U-shape. The various folding and glueing stations are positioned around an endless traveling conveyor having a plurality of mandrels attached thereto. The carton blank advances first in one direction and then turns in a U-shaped path and advances in the opposite direction. The folded carton is then stripped from the mandrel to be passed to a filling station forming no part of the invention.
Abstract:
A multiple nozzle fluid dispenser having jointly and independently actuable valves that are interchangeable as to their relative positions and having means for accommodating a valve operating mechanism for the valves to any arrangement of the valves.
Abstract:
A device for dispensing adhesive includes a thin member having a plurality of adhesive dispensing openings extending therethrough. There is a passage for supplying adhesive to said openings. An inflatable tube is positioned in the passage and, when inflated, is positioned against said openings to prevent the flow of adhesive therethrough.
Abstract:
A fluid dispenser and a support shoe are mounted to bear on opposite sides of a box blank passing therebetween. A normally closed valve of a nozzle of the dispenser has means yieldably biasing the nozzle to a normal position to intercept a leading edge of a box blank to open the valve upon deflection of the nozzle. A predetermined longitudinally spaced-apart gap relationship of the nozzle and support shoe effects return of the nozzle to normal position and closing of the valve, in response to the nozzle biasing means, concurrently with a trailing edge of the box blank leaving the support shoe, to wipe the closed nozzle clean on a deflected trailing end portion of the box blank. Alternatively, the support shoe may be rockably mounted for movement to a retracted position providing clearance for deflection of the trailing end portion of the box blank by the nozzle biasing means. An automatically controlled pneumatic power system may be employed for moving the rockable shoe between extended and retracted positions, synchronously with movement of box blanks therepast, for a skip pattern delivery of fluid.
Abstract:
A glue applicator for applying glue to a work sheet, such as a carton flap, by passage of the sheet between a sheet support and an applicator roller to which glue is applied, preferably with the aid of a spreading roller in peripheral contact with the applicator roller, and which rolls a thin film of the glue onto the sheet. The glue applicator is particularly adapted for use on a carton sealing machine to apply glue to one folded flap of a flattened carton structure which is thereafter fed into the machine between feed rolls of the machine which compress the carton structure to bond the glue coated flap to a second overlying flap.