Abstract: A pressed paperboard container (10) is formed having a bottom wall (11), an upturned side wall (12), and an overturned rim (13 ) extending from the side wall which is denser and thinner than the rest of the container. The container is formed by pressing a flat circular blank (27) between upper and lower dies (25, 26) having die surfaces (31, 32, 38, 39, 40) which shape the blank into proper form, and the surfaces of the dies (25, 26) at the rim area (13) of the container are shaped to exert extremely high compressive stresses on the rim, particularly at the folded areas (20) formed in the rim during initial shaping of the container. The high compressive stresses applied to the rim area, along with proper moisture levels maintained in the paperboard and the heating of the paperboard by the heated dies, causes the paperboard in the rim area to deform plastically, densify, and fill in voids created as the blank was pressed into the container form.

Abstract: A method of improving absorbency of air laid bonded fibrous webs and the products resulting therefrom, the preferred method comprising the step of imprinting at least one surface of the fibrous web between a pair of cylindrical rolls under a pressure of at least 100 pounds/lineal inch, the compacted area of each imprinted web surface being at least 40%, preferably at least 50%, of the total imprinted surface. In the preferred embodiment of the method, the fibrous web is first wetted with water, the imprinting step then being conducted with imprinting means heated to about 140.degree. to about 180.degree. C.The products obtained have densified zones underlying the compacted areas, the density thereof being at least 0.1 gm./cc., which zones enhance absorbency as compared to unimprinted webs by at least 25%. The preferred webs provided by the method are imprinted with a grid-like pattern, said pattern preventing nesting of individual sheets in product rolls and containers.

Abstract: A pressed paperboard container (10) is formed having a bottom wall (11), an upturned side wall (12, and an overturned rim (13) extending from the side wall which is denser and thinner than the rest of the container. The container is formed by pressing a flat circular blank (27) between upper and lower dies (25, 26) having die surfaces (31, 32, 38, 39, 40) which shape the blank into proper form, and the surfaces of the dies (25, 26) at the rim area (13) of the container are shaped to exert extremely high compressive stresses on the rim, particularly at the folded areas (20) formed in the rim during initial shaping of the container. The high compressive stresses applied to the rim area, along with proper moisture levels maintained in the paperboard and the heating of the paperboard by the heated dies, causes the paperboard in the rim area to deform plastically, densify, and fill in voids created as the blank was pressed into the container form.

Abstract: An air laid fibrous web product of enhanced absorbency and method of making same having a basis weight of between about 8 to about 50 pounds per ream, and a bulk of at least 0.40 mils per pound per ream, the web product comprising a multiplicity of papermaking fibers distributed randomly in the form of a web, an adhesive material, preferably a latex, essentially permeating said web of randomly distributed fibers and upon curing bonding adjacent fibers, the adhesive material representing between about 15 to about 30% of the basis weight of the web product and between about 0.1 to about 5.0 by weight of a hydrophile, said hydrophile substantially coating the bonded fibers. The hydrophile is applied to the web as an aqueous solution downstream of the bonding station, either in an immersion or spray treating step.

Abstract: A two piece container (2) for cooking food in a microwave oven including an outer package (4, 60) formed from a single blank having a removable section (8, 72, 74, 80c) for exposing water vapor ventilation holes and an inner food supporting tray (6, 48). In one embodiment, the inner food supporting tray (6) is formed from a single blank and having V-shaped support legs (44 and 46) to raise the food supporting surface (38) above the surface of the outer package. The material from which the outer package is made has a vapor absorptive characteristic. The inner food supporting tray (6, 48) is completely coated on one side with a microwave absorptive material for heating up to brown or crisp the surface of food in contact with the tray (6) and may be, in addition, coated with a stick and grease resistant material. In one embodiment of the outer package (4), a microwave reflective shielding layer is included on an inner top panel (34) to prevent overcooking of the top of food contained within the container.

Abstract: A container including a paperboard carton (4) for heating and crisping two sides of food pieces having non-uniform dimensions in a microwave oven including initial and final vertically spaced food supporting panels (14,30) separated by a vertical distance exceeding the average vertical height of the food pieces. A pair of microwave interactive layers (16,102) are associated with corresponding food supporting panels (14,30) for converting microwave energy into conductive heat for browning and crisping the food pieces. Handles (8) formed in the paperboard container are provided for allowing manual inversion of the container during the crisping and cooking process to cause food pieces initially supported by the initial food supporting panel to move under the force of gravity into supporting relationship with the final food supporting panel.

Abstract: A method of and apparatus for forming an air laid, e.g., dry laid, fibrous web comprising the steps of and apparatus for defiberizing wood pulp laps, rolls or bales, preferably in a hammermill; transporting the fibers pneumatically to a forming head, and dispensing said fibers onto a foraminous support means, the aforesaid operations being carried out at conditions of high humidity such that the average fiber moisture content is at least above 2.5% by weight just prior reaching a forming header. In the preferred embodiment air at between about 150.degree. to about 200.degree. F. and having a relative humidity of between about 75 to 95% is introduced to the defiberizer to provide the requisite air moisture content. If desired over large fibers from the forming head may be recycled to the defiberizer. By practicing the invention, electrostatic charges on the fibers are reduced thereby minimizing clumping and ensuring better formation.

Abstract: Tear strip structure for the relatively narrow side wall of a relatively flat rectangular paperboard carton. The side wall is defined by an inner folded closure flap and an outer flap folded thereover. The outer flap has a line of weakness extending along its length, between and parallel to its fold line and its free edge. The inner flap has a first cut score line defining its fold line and a second cut score line coincident with the line of weakness of the outer flap. The region of the outer flap overlying the region of the inner flap between the cut score lines is adherent to the latter region and defines a tear strip, an end portion of which is non-adherent and functions as a tab by which the strip may be grasped and torn away, separating the plies of the underlying closure flap between the cut score lines in achievement of removal of the tear strip in predictable, controlled manner.

Abstract: Apparatus for forming an air laid, e.g., dry laid, fibrous web comprising apparatus for an defiberizing wood pulp laps, rolls or bales, preferably in a hammermill; transporting the fibers pneumatically to a forming head, and dispensing said fibers onto a foraminous support means, the aforesaid operations being carried out at conditions of high humidity such that the average fiber moisture content is at least above 2.5% by weight just prior to reaching a forming header. In the preferred embodiment air at between about 150 to about 200 F. and having a relative humidity of between about 75 to 95% is introduced to the defiberizer to provide the requisite air moisture content. If desired overly large fibers from the forming head may be recycled to the defiberizer. By practicing the invention, electrostatic charges on the fibers are reduced thereby minimizing clumping and ensuring better formation.

Abstract: Heat resistant ovenable paperboard containers are formed from wet sheets consisting essentially of cellulose fibers and containing 50 to 100 weight percent water based on the dry weight of the fibers by hot pressing in a mold at 200.degree. to 400.degree. F. Heat resistant synthetic fibers may be incorporated in wood pulp to produce the wet sheet and impart improved burst strength to the finished product.

Abstract: Fibrous webs of improved bulk and softness are produced by subjecting hydrophilic papermaking fibers to mechanical deformation, e.g. hammermilling, sufficient to deform the fibers without substantial fiber breakage, dispersing the resulting curled or kinked fibers, preferably in admixture with conventional papermaking fibers, in an aqueous foam with minimal agitation and holding time and forming a wet laid web from the resulting fiber furnish.

Abstract: A dispenser package for holding a stack of nested tapered disposable cups and dispensing them individually. The dispenser package has a generally circular opening in the top wall through which the bottoms of the tapered cups protrude; surrounded by a series of arcuate dispensing jaws interconnected with straight sided segments forming yieldable segments around the periphery of the opening which permit the topmost protruding cup to be pulled through the opening, but which function to restrain the cups immediately below. Slits or knife cuts in the top wall of the dispenser package extend from the opening in the top wall to each of the sidewalls at the mid point of each sidewall to permit loading a stack of cups through the top opening of the dispenser package without tearing of the top wall.

Abstract: A dispenser package for holding a stack of nested tapered disposable cups and dispensing them individually. The dispenser package has a generally circular opening in the top wall through which the bottoms of the tapered cups protrude; the opening is surrounded by a series of short radial slits or knife cuts defining a series of yieldable tabs around the periphery of the opening which permit the topmost protruding cup to be pulled through the opening, but which function to restrain the remaining cups in the stack. Additional slits or knife cuts in the top wall of the dispenser package extend from the opening in the top wall to each of the sidewalls at a point near each sidewall to permit loading a stack of cups through the top opening of the dispenser package without tearing of the top wall.

Abstract: A process for manufacturing embossed, nonwoven fibrous products comprising the steps of subjecting a binder-treated fibrous dry laid web to a low cure treatment to obtain a moldable web with good physical integrity; embossing the low cure treated web; and fully curing the web.

Abstract: A dispensing package for diabetic test care strips of paper includes a paperboard pouch containing a test strip unit. The pouch has a reclosable flap affording access to the contained test strip unit, the latter comprising a paperboard backing panel having a tab on one end accessible at the opening of the pouch. Attached to the other end of the panel is the edge portion of a stack of test strip material having parallel cuts extending from the free edge of the stack toward the attached edge, and which cuts define test strips adapted to be torn from the unit after it is removed partially or entirely from the pouch.

Abstract: Paper webs are produced in a modified conventional felted wet press process in which the fiber furnish has a chemical debonding agent added thereto in high concentrations. The web (17) is formed on a conventional Fourdrinier wire (12), transferred to a moving felt (19) which presses the web against the surface of a drying cylinder (23) to reduce its water content, and is carried by the surface of the drying cylinder (23) to a creping blade (24). Liquid adhesive is applied to the surface of the creping cylinder (23) adhead of the contact with the web to provide substantial adherence of the web to the creping surface at the point of contact with the creping blade. The levels of addition of debonding agent to the pulp furnish and the amount of adhesive applied to the creping surface are selected such that the adhesion of the web to the surface at the creping blade is greater than the internal cohesion of the web.

Abstract: Apparatus and method for the manufacture of a non-woven fibrous web, such as paper, from a dispersion of fibers in a foamed liquid. In a preferred embodiment, a solution of surfactant in water is initially discharged from a headbox into the nip of a twin forming wire prior to its passage over a curvilinear path defined by a forming roll. The water-surfactant solution is caused repeatedly to pass through the outer one of the twin forming wires until there is created, and stored in a silo, a foamed liquid containing about 65% air in the form of bubbles of from about 20 to about 200 microns in diameter. The foamed liquid is directed from the silo into a mix tank wherein a slurry containing fibers at 20% to 55% solids is added and mixed. The mixture is pumped to the headbox and into the nip of the forming wires. The outer wire retains the fibers while passing and again foaming the liquid for return to the silo and the mix tank for addition of fibers and return to the headbox.

Abstract: Apparatus and method for the manufacture of a non-woven fibrous web, such as paper, from a dispersion of fibers in a foamed liquid. In a preferred embodiment, a solution of surfactant in water is initially discharged from a headbox into the nip of a twin forming wire prior to its passage over a curvilinear path defined by a forming roll. The water-surfactant solution is caused repeatedly to pass through the outer one of the twin forming wires until there is created, and stored in a silo, a foamed liquid containing about 65% air in the form of bubbles of from about 20 to about 200 microns in diameter. The foamed liquid is directed from the silo into a mix tank wherein a slurry containing fibers at 20% to 55% solids is added and mixed. The mixture is pumped to the headbox and into the nip of the forming wires. The outer wire retains the fibers while passing and again foaming the liquid for return to the silo and the mix tank for addition of fibers and return to the headbox.

Abstract: A method of increasing the caliper and bulk of air laid dry fibrous webs, particularly such webs intended for use as napkin, tissue, and absorbent paper towel products by partially drying the loose formed fibrous webs to a degree of dryness of less than 4% prior to consolidation. In the preferred embodiment uniformity of the product web caliper in the machine direction is obtained by measuring the caliper downstream of the bond curing drier and before take-up on the parent roll, output signals therefrom being transmitted to the drier for adjustment of one or more of the drier parameters. Uniformity of caliper in the cross machine direction can be optimized by providing multisectional driers in the cross machine direction, a series of output signals from the caliper sensing means being transmitted to the respective drier sections for individual adjustment of the drier parameters.

Abstract: Reclosable carbon structure of a generally rectangular configuration is set up from a paperboard blank. A top wall serving as a closure is hinged along one edge portion to the carton and the opposite edge portion of the top wall includes a downturned flap extending over a side wall of the carton. The flap is adhered to the side wall in areas surrounded by discontinuous knife cuts provided on at least the flap or the panel so that, upon opening the closure, the knife cut area is delaminated in a controlled pattern.