Abstract: This invention relates to improvements in the top-to-bottom compressive strength of corrugated fiber containers through the use of a minimum amount of extra fiber. Such structures of this type, generally, employ strip and patch laminations which provide minimal additional fiber and maximal reinforcement in the areas of the corrugated container panels that are under the highest compressive stresses when the containers are subjected to compressive loads.

Abstract: This invention relates to sleeves or belts which are used in paper machines. Such structures of this type, generally, are reinforced through the use of reinforcing fibers which are oriented at an angle turned 45.degree. from the straight machine direction orientation. This arrangement aligns the individual reinforcing strands in the direction of the principal tensile stresses that exist within the sleeve or belt structure as the sleeve or belt is being rotated in the paper machine.

Abstract: Lids and/or closures applied to cartons which are used for distributing, marketing and heating small portions of prepared food are fabricated with a paperboard structural substrate coated with a heat activated (or sealable) coating of water soluble acrylic emulsion that is applied by means of a press in conjunction with a printing operation or, alternatively, by a coating operation separate from the printing operation. Other critical coating characteristics are that the acrylic emulsion coating is heat sealable to itself, to polymers such as polyethylene terephthalate and directly to unprimed paperboard, with or without a clay coating, and can be tack bonded at temperatures of 250.degree. F. or greater. Additionally, so as to avoid food contamination from the coating, the coating is mass stable below 400.degree. F. and have chloroform-soluble extractives not exceeding 0.5 mg/in.sup.2 of a food contact surface when exposed to a food simulating solvent, (for example, N-Heptane) at 150.degree. F. for two hours.

Abstract: This invention relates to paperboard food packages. Such structures of this type, generally, have lids which can be sealed to the food package which utilizes press-applied coatings as a sealing medium.

Abstract: The present invention relates to a method and apparatus for producing paperboard packaging blanks (trays, lids, cartons, or combinations) in which the application of the barrier coating is combined with the printing of the sales graphics in a single-pass operation which eliminates the need for a separate off-line coating operation.

Abstract: Folded paperboard food cartons having a barrier 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 printed with a patterned solvent based polymer material that is precisely applied to such areas by a printing press.

Abstract: This invention relates to an apparatus and method for measuring the peel strength of a paper joint which is adhesively bonded. Such structures of this type, generally, allow the peel strength of the adhesively bonded joint to be accurately and repeatably measured in an inexpensive manner.

Abstract: A low contaminant level is maintained in a high flow rate paper machine coating fluid circulation system by shunting a significant minority portion of the total flow through a full flow, atmospherically open, self-cleaning screen having a fine mesh screen cloth. Accept flow from the open screen is directed to the flow inlet of an entrained air purging apparatus for dispersing consolidated particulates of excessive size. Flow from the particulate disbursing apparatus is thereafter pumped through an enclosed pressure screen of moderate screen mesh.

Abstract: A composite food packaging article having internal partitioning walls and corresponding method of manufacture is constructed from flat, machine formed paperboard. A pair of die cut and folded paperboard blanks are inserted within the opposing cavities of a blow mold. A hot-flow parison between the cavities expands to structurally unitize the folded paper blank into a fluid impermeable tray vessel.

Abstract: A composite material package in the configuration of a fluid confining tray or bowl is fabricated with a corrugated paperboard structural substrate and internally sealed with a blow mold applied film of polymer.

Abstract: A composite material package in the configuration of a fluid confining bowl with curved or arched side walls is fabricated with a paperboard structural substrate and internally sealed with a blow mold applied film of polymer.

Abstract: Paper that is uniquely suitable for use in the aseptic packaging of foods, beverages, and the like is produced via a two step sizing process comprising an internal size step and a surface size step. The internal size includes approximately 1.0% anionic rosin and about 1.3 to 2.6% alum (based on the dry pulp weight) blended to a 4.0 to 4.5 pH controlled papermachine headbox stock furnish. Following web formation and drying, the surface size is applied with a composition including about 0.025 to 0.050% alkyl ketene dimer (based on the dry pulp weight) blended with a traditional starch formulation and sufficient sodium bicarbonate to both neutralize any unreacted alum present near the surface of the internally sized web and to produce a paper having a water extractable pH level of from about 4.0 to below 6.0. Secondary web drying follows the surface size application.

Abstract: Paper machine deckle defining structure is protected from fiber accumulations by a uniformly distributed water film that continuously flows from a flat, horizontal upper surface over all smoothly faired lower surfaces of the deckle elements.

Abstract: Papermachine stock consistency is regulated while carried along a forming wire table. A variable draft vacuum box disposed beneath the forming wire to draw water from the wire carried stock is automatically adjusted in response to the summation of signals from several sources. A radioactive mass measuring gauge having a sensor head positioned beneath the forming wire downstream of the vacuum box provides a signal value indicative of the total mass carried above the sensor head. From this mass measuring gauge signal is deducted a value representative of the wire mass; the remainder representing the stock mass comprising a mixture of fiber and water. The quantity of fiber in the stock mixture, independent of the water, is determined by a dry basis weight measure of paper made from the stock. A signal value representative of the fiber basis weight is divided by the stock mass signal value to yield a consistency signal value.

Abstract: A paper machine deckle board is supported and protected from fiber accumulations by a multi-functional structure which adjustably positions the deckle board with an integrated flushing water conduit and film distribution fountain.

Abstract: Paper machine deckle defining structure is protected from fiber accumulations by a uniformly distributed water film that continuously flows from a flat, horizontal upper surface over all smoothly faired lower surfaces of the deckle elements.

Abstract: An in situ traveling paper machine web is stabilized from flutter and vibration for the purpose of formation and optical property measurement by an air flow system by which a boundary layer air stream between a sole plate and the adjacent web surface secures the web in a stable position.

Abstract: To protect the paper machine fourdrinier screen, deckle blades are fabricated with a soft polymer (polytetrafluoroethylene) lower edge having little adhesive affinity for either papermaking fiber or traditional plastic bonding compounds. Necessary structural rigidity is contributed to the assembly by a mechanical cladding of suitably stiff polymer plates that are adhesively bonded to a compatible plastic mounting body.