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AssigneeE. Khashoggi Industries
InventorsPer Just Andersen, Simon K. Hodson
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Compositions, methods, and systems for manufacturing articles, particularly containers and packaging materials, having a starch-bound cellular matrix reinforced with substantially uniformly dispersed fibers. High strength articles that have adequate flexibility and toughness immediately or very shortly after being demolded without the need for subsequent conditioning are molded from compositions having a starch-based binder and fibers that are uniformly dispersed by means of a high yield stress fluid fraction within the starch-based composition. In a two-step mixing process, a preblended mixture is formed by gelating a portion of the starch-based binder or other thickening agent in water to form a liquid phase having high yield stress into which the fibers are substantially uniformly dispersed. The fibers preferably have an average length of at least about 2 mm and an aspect ratio of at least about 25:1. The remaining starch-based binder, water, and other desired admixtures, such as mold-release agents, inorganic fillers, rheology-modifying agents, plasticizers, integral coating or sealing materials, and dispersants, are added to the preblended mixture to form a moldable starch-based composition, which is molded between heated molds to produce form-stable articles having a desired shape and a selectively controlled foamed structural matrix. Such articles can replace articles presently made from conventional materials like paper, paperboard, polystyrene, plastic, or other organic-based materials and have especial utility in the mass-production of containers, particularly food and beverage containers.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix of starch-based binder and inorganic aggregate, the matrix comprising a starch-based binder, an inorganic aggregate filler, and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average aspect ratio greater than about 25:1, the inorganic filler having a concentration greater than about 20% by weight of the starch-bound cellular matrix, wherein the starch-bound cellular matrix has a thickness less than about 1 cm, wherein the starch-bound cellular matrix degrades after prolonged exposure to water.
An article of manufacture having a fiber-reinforced, inorganically filled, starch-bound cellular matrix of starch and inorganic aggregate, the cellular matrix comprising a starch-based binder, an inorganic aggregate filler having a concentration in a range from about 20% to about 80% by weight of the cellular matrix, and fibers substantially uniformly dispersed throughout the matrix, the fibers having an average fiber length in a range from about 2 mm to about 25 mm, an average aspect ratio greater than about 25:1, and a concentration in a range from about 2% to about 80% by volume of the starch-bound cellular matrix, wherein the starch-bound cellular matrix has a thickness less than about 5 mm and degrades after prolonged exposure to water.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix comprising a starch-based binder and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average length greater than about 2 mm, an average aspect ratio greater than about 25:1, and a concentration in a range from about 2% to about 80% by weight of the cellular matrix, the cellular matrix having a thickness less than about 1 cm and degrades after prolonged exposure to water.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix comprising a starch-based binder and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average length greater than about 2 mm, an average aspect ratio greater than about 25:1, and a concentration in a range from about 2% to about 80% by weight of the cellular matrix, the cellular matrix including an outer skin portion having a density and an interior foam portion having a density that is significantly lower than the density of the outer skin portion.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix of starch and inorganic aggregate, the cellular matrix comprising a starch-based binder, and inorganic aggregate filler, and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average aspect ratio greater than about 25:1, the inorganic aggregate filler having a concentration greater than about 20% by weight of the cellular matrix, the cellular matrix including an outer skin portion having a density and an interior foam portion having a density that is significantly lower than the density of the outer skin portion.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix comprising a starch-based binder and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average length greater than about 2 mm, an average aspect ratio greater than about 25:1, and a concentration in a range from about 2% to about 80% by weight of the cellular matrix, the cellular matrix having an average density less than about 0.25 g/cm.sup.3.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix comprising a starch-based binder, an aggregate filler, and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average length greater than about 2 mm, an average aspect ratio greater than about 25:1, and a concentration in a range from about 2% to about 80% by weight of the cellular matrix, the cellular matrix including an outer skin portion having a density and an interior foam portion having a density that is significantly lower than the density of the outer skin portion.
An article of manufacture having a fiber-reinforced, starch-bound cellular matrix comprising a starch-based binder, an inorganic aggregate filler, and fibers substantially uniformly dispersed throughout the starch-bound cellular matrix, the fibers having an average length greater than about 2 mm, an average aspect ratio greater than about 25:1, and a concentration in a range from about 2% to about 80% by weight of the cellular matrix, the inorganic aggregate filler having a concentration greater than about 20% by weight of the cellular matrix, the cellular matrix including an outer skin portion having a density and an interior foam portion having a density that is significantly lower than the density of the outer skin portion.
Dependencies are inferred from the claim text.