Abstract:
A method of making a hard multi-tubular structure which comprises; producing a flat hose fabric composed of a plurality of side-by-side abutting hoses, introducing uninflated foil tubes into each of the hoses of the fabric, the tubes being of substantially the same length as the length of the fabric, inflating the tubes for expanding the hoses into formed hollow sections, treating the fabric with a hardening material, and allowing a hardening of the hardening material and a setting of the fabric with the hoses in expanded condition. Therefollowing, the tubes are left after the setting of the hose fabric in the respective hollow sections free of any internal inflating pressure. Alternatively, the tubes may be withdrawn from the hollow sections after the setting.
Abstract:
A method of applying a vermicular expanded graphite composite material to the interior surface of a conduit by a two-step in situ compression process is disclosed.
Abstract:
An extrusion pelletizing process is disclosed wherein coolant is injected into the stream of thermoplastic material being extruded in such a fashion to interrupt the flow thereof and form discrete material lengths thereof as the material moves through the extrusion die and exits at the other end thereof in the form of pellets. The coolant is permitted to at least partially vaporize upon contact with the material stream and accordingly forms a solidified shell therearound including end portions of adjacent pellets so as to effectively separate such as they pass through the die. Such system enables the formation of discrete material lengths or pellets without the need of conventional cutting apparatus such as knives and the attendant support equipment necessary in their use.
Abstract:
A system and method for heating thermoplastic material and forming elongated and involute thermoplastic articles from the thermoplastic material is disclosed. Means are provided for controllably heating a sheet of thermoplastic material to form preselected temperature gradients throughout the sheet of thermoplastic material. Means are further provided for planarly supporting the heated sheet of thermoplastic material allowing for transverse motion of the heated sheet of thermoplastic material at the center thereof and further allowing for controlled slippage of the heated sheet of thermoplastic material toward said center thereof relative to the planar support means. Means are also provided for transversely forming a heated sheet of thermoplastic material into the shape of an elongated or involute plastic article.
Abstract:
In a multi-layer blow molded container having a joint portion at least in the bottom portion thereof, barrier characteristics to gases such as oxygen and water vapor and liquids such as water, solvents, aqueous ammonia and salt water and interlaminar strength characteristics such as interlaminar adhesion strength, peel strength and impact strength in the content-filled state can be highly improved by blow molding a parison of a laminate structure of two or more polymer layers in which the polymer composition is different with respect to the thickness direction of the container wall but substantially identical with respect to the plane direction and each of the polymer layers is continuous with respect to the plane direction, in such a manner that a tapered projection protruding outwardly in the thickness direction of the container wall is formed in the joint portion so that each of the polymer layers is substantially continuous in this joint portion. This improved container can easily be prepared according to the customary blow molding technique by using a pair of split molds having such a configuration that a tapered concave groove is formed in the section pinching off the parison when the molds are registered with each other.
Abstract:
For the blow molding of hollow articles there is provided a receiving station where parisons are prepared, a removing station where the blow molded articles are released from the mold and a depositing station where the articles are placed for transportation or treatment. A mold is movable between the receiving and the removing station and a gripper is movable between the removing and the depositing station. When the mold takes a parison in the receiving station, the gripper grasps a blow molded article in the removing station previously left there by the mold. When the mold opens and releases an article in the removing station, the gripper releases the previously grasped article in the deposition station.
Abstract:
A process and apparatus are disclosed for melt-spinning hollow fibers under precisely controlled pressure conditions to provide more uniform properties for reverse-osmosis separation.
Abstract:
A system is provided for applying a force to selected compliant material ch is in adjacent relationship with the inner surface of a rigid spherical segment. The system includes an elastomeric spherical segment having an apex and a radius of curvature which is less than the radius of curvature of the inner surface of the rigid spherical segment when the elastomeric segment is in an undeformed condition. Operative structure is provided for initially spacing the elastomeric segment from the rigid spherical segment, so that the elastomeric segment is in point contact relationship with the compliant material, and for controllably urging the elastomeric segment toward the compliant material after the initial spacing, until the curvature of the elastomeric segment is conformed to the curvature of the inner surface of the spherical segment.
Abstract:
Melt blown non-woven mats prepared from thermoplastic polymer fibers and substantially completely free of polymer shot are produced at high polymer throughput rates in an improved melt blowing process in which thermoplastic polymer resins, preferably polypropylene, having initial intrinsic viscosities of at least 1.4, are degraded, optionally in the presence of a free radical source compound, to have both reduced intrinsic viscosities and an apparent viscosity in the melt-blowing nozzle orifices of from about 50 to about 300 poise.
Abstract:
This invention is a method of making blown plastic articles on an injection blow molding machine with an expandible balloon that covers the core rods and over which a parison is applied at an injection mold station. The parison can be blown at lower temperatures for better orientation; and the balloon permits circulation of cooling fluid, including liquid, to cool the blown article from the inside while contact with the blow mold cavity cools the blown article from the outside.