Abstract: A system and method for producing foundry quality sand from non-conventional starting materials through the combination of oolitization and classification. Incoming particulate matter is first directed into a controlled energy attrition unit where the particles are made to collide with one another. Such collisions clean and round the particles by chipping away surface projections and coatings without crushing the particles. The particle stream is then directed through a multi-fraction classifier where it is separated into two or more useable grades of foundry sand. An air classifier is preferred for the classification stage.

Abstract: A system and method for producing foundry quality sand from non-conventional starting materials through the combination of oolitization and classification. Incoming particulate matter is first directed into a controlled energy attrition unit where the particles are made to collide with one another. Such collisions clean and round the particles by chipping away surface projections and coatings without crushing the particles. The particle stream is then directed through a multi-fraction classifier where it is separated into two or more useable grades of foundry sand. An air classifier is preferred for the classification stage.

Abstract: An air classifier with enhanced air flow which maybe used for the simultaneous recovery of two or more distinct grades of foundry quality sand from a single sand stream. The air classifier exhibits improved performance by drawing into the classification chamber, through the use of suction, incoming air through a honeycomb followed by a screen section having two or more screens. The honeycomb removes swirl in the air and the screens slow down the fast moving air more than the slow moving air. After passing through the screens, the velocity profile of the air in the chamber is flat across the inlet flow path and, as a result, improved classification performance is achieved. Classification performance may be further enhanced through the use of a vibrating screen feeder for spreading the incoming particle stream before entrainment in the air flow within the classifier and through upward flowing air in one or more product receiver sections.

Abstract: A system and method for producing foundry quality sand from non-conventional starting materials through the combination of oolitization and classification. Incoming particulate matter is first directed into a controlled energy attrition unit where the particles are made to collide with one another. Such collisions clean and round the particles by chipping away surface projections and coatings without crushing the particles. The particle stream is then directed through a multi-fraction classifier where it is separated into two or more useable grades of foundry sand. An air classifier is preferred for the classification stage.

Abstract: A method of producing a fast-dissolving pharmaceutical delivery device of moderate strength. The delivery device is a fully formed tablet composed of readily available sugars, strength polymers and a volatilizable excipient along with an active ingredient and optional flavorings. The tablet as made will disintegrate in an aqueous medium such as saliva in under 15 seconds, making mastication unnecessary or at least requiring only one or two bites on the tablet. Essential to the invention is the easily obtainable particle size ranges of the sugars and the volatilizable excipient which promotes optimum release and tablet strength. The invention also allows for effective taste masking of the active ingredient with standard particle coating techniques.

Abstract: An air classifier with enhanced air flow which maybe used for the simultaneous recovery of two or more distinct grades of foundry quality sand from a single sand stream. The air classifier exhibits improved performance by drawing into the classification chamber, through the use of suction, incoming air through a honeycomb followed by a screen section having two or more screens. The honeycomb removes swirl in the air and the screens slow down the fast moving air more than the slow moving air. After passing through the screens, the velocity profile of the air in the chamber is flat across the inlet flow path and, as a result, improved classification performance is achieved. Classification performance may be further enhanced through the use of a vibrating screen feeder for spreading the incoming particle stream before entrainment in the air flow within the classifier and through upward flowing air in one or more product receiver sections.

Abstract: A method of producing a fast-dissolving pharmaceutical delivery device of moderate strength. The delivery device is a fully formed tablet composed of readily available sugars, strength polymers and a volatilizable excipient along with an active ingredient and optional flavorings. The tablet as made will disintegrate in an aqueous medium such as saliva in under 15 seconds, making mastication unnecessary or at least requiring only one or two bites on the tablet. Essential to the invention is the easily obtainable particle size ranges of the sugars and the volatilizable excipient which promotes optimum release and tablet strength. The invention also allows for effective taste masking of the active ingredient with standard particle coating techniques.

Abstract: The present invention relates to particles having a core comprising a peroxy compound and a hydrophobic coating comprising:(a) a hydrophobic substance selected from saturated fats, waxes or phosphatides;(b) a surfactant dissolved in the hydrophobic substance;(c) water swellable grains;the hydrophobic substance and the surfactant being substantially inert in respect of the peroxy compound.The invention also relates to preparation and use of the particles. Further, the invention relates to a composition containing such coated particles.

Abstract: This relates to the provision of a vacuum actuated button type closure with a tamper indicating arrangement which will visually indicate when a container has been opened or more particularly when the vacuum within a vacuum packed container has been lost. The deflectable button of the closure is utilized to squeeze a dye from a sponge like member into a layer of absorbent material so as to color the absorbent material. The absorbent material, in turn, is provided with non-absorbent areas which define indicia to indicate that an associated container has been opened.

Abstract: A composition which is stable in a medium in which the pH is greater than or equal to 5.5 and which permits the release of an active substance in a medium in which the pH is less than or equal to 3.5, comprising the active substance, which contains inclusions of, or which is completely or partially covered by, a pH sensitive material whose extent and/or rate of swelling is greater in an acidic medium than in a neutral medium, and a coating of a hydrophobic layer.

Abstract: A method of melt granulation for powdery material is disclosed wherein the powdery material is discharged onto the upper surface of a heated rotary spreader for migration under centrifugal force to the periphery of the spreader accompanying by melting of a portion of the material and enrobing of non-melted particles by the melted material for discharge as enlarged granules from the periphery of the spreader. To improve the quality of the granules produced, the feed material is supplied to the spreader at two separate locations. The first location is the central portion of the spreader to provide the melted material and the second location is adjacent to the periphery of the spreader. The spreader is preferably in the form of a concave bowl or inverted truncated cone or dish.

Abstract: Method and apparatus for the formation of granules of a larger size or mass of a desired range from a feed stock of smaller particles comprising feeding a meltable powdery material to be granulated, or a non-meltable powdery material with a meltable binder to the surface of a rotating spreader means in the form of a disk or bowl, at least a portion of which has been heated to a temperature above the melting point of the meltable component of the feed material wherein the rate of feeding, the energy input to the spreader means and the rotational speed of the spreader means are controlled so that there is sufficient time for at least a partial melting of the meltable component of the feed material substantially solely by contact with the heated surface of the spreader means, centrifugally spreading the material across the surface of the disk or bowl and dispersing the same from the edge thereof into an atmosphere cooler than the melting temperature to form the granulated product.

Abstract: Solid particles or viscous liquid droplets of core material are encapsulated in a coating material largely as single particles with a single coherent coating, by feeding a suspension of the two materials onto a rotating surface. The suspension is centrifugally dispersed by the rotating surface into relatively large coated particles and relatively small droplets of coating material. Only the size of the droplets of unused coating corresponds to the droplets formed from atomization of the liquid coating material. The size of the coated particles depends on the size of the uncoated particles and is much less dependent upon the atomization characteristics of the rotating surface. Upon being thrown from the rotating surface, or falling from that surface, the droplets and coated particles are solidified by exposure to air and are separated by sieving, or the like. The solidified droplets of pure coating material may be recycled into the suspension.

Abstract: The pore size distribution of a microporous separation medium, such as a membrane or gel, is modified so as to provide it with a sharp upper cut-off of preselected molecular size. The modification is effected by first filling the pores of the separation medium with a volatile liquid, and then evaporating a controlled amount of the volatile liquid to form voids at the entrances to the pores. A concentrated solution of a cross-linkable or polymerizable pore-blocking agent, such as a protein, enzyme or polymeric material, is then applied to the surface of the separation medium. The pore-blocking agent is a material which is insoluble in the volatile liquid and whose molecular size distribution has a lower limit corresponding to the preselected molecular size, whereby the pore-blocking agent selectively enters only those pores larger than the preselected size and remains in the voids at the entrances to the pores.

Abstract: Aluminum hydrogels which are stabilized at pH below 7 with a polymer containingcarboxyl groups, e.g., carboxy methyl cellulose or gum arabic. The gels are useful as phosphate binding agents in the treatment of hyperphosphatemia. Such polymers are incorporated during the formation of the aluminum hydrogel, permitting a high yield to be obtained, and preventing colloidal sol formation during exchange with monovalent anions.