摘要:
The moldings are manufactured from synthetic thermoplastics, from non-thermoplastic fibrous flakes, which are available in an uncoated or incompletely coated state, and from optionally admixed fillers. The fibrous flakes and the thermoplastic material are mixed under the action of pressure and heat to produce a precompacted composite material, in which the fibrous flake material constitutes about 65% or more by volume of the composite material, and the latter is then extruded and is subsequently finally shaped and finally compacted at the same time. To manufacture the precompacted composite material, the non-thermoplastic materials consisting of the fibrous flake material and of any fillers, as well as synthetic thermoplastics which are adapted to adhere to the fibrous flake material, are subjected to a pretreatment, by which the thermoplastic and non-thermoplastic materials are extruded at elevated temperature and are thus bonded together and the extrusions are subsequently chopped to form a flowable composite particulate material.
摘要:
The instant invention is directed to a novel process for the production of bonded foam, and particularly polyurethane foam scrap. The process allows for the production of a high quality rebonded product. Significant improvements are seen in the quality of the product, reduction in density, reduction in scrap loss, elimination of density variations in the molded product and overall product consistency.
摘要:
A process for the production of a plastics film in which a polymeric composition comprising a fresh linear polyester and polymer derived from a film of a synthetic linear polyester coated with a composition comprising a thermosetting acrylic or methacrylic composition is shaped by extrusion.
摘要:
A method for reclaiming scrap produced in the manufacture of fabric reinforced thermoplastic resin sheet material so that the scrap may be worked, banded and calendered or extruded to form a finished product. The reclaiming or reworking of the material is made possible by first tearing the fabric fibers embedded in the thermoplastic resin into discrete finite lengths, mixing the resulting fibers and resin and forming the mixture into a new sheet of thermoplastic resin material suitable for many commercial uses. The tearing of the textile fibers embedded in the scrap into minute lengths is accomplished by applying shearing force to the opposite surfaces of the segments of scrap, in directions parallel to the surfaces. This is accomplished, for example, in a Banbury mixer or in a tight cold mill. The shearing force causes stretching and ultimate rupturing and tearing of the fibers progressively throughout the entire surface area of the scrap segment. The fibers in the resulting mixture are of minute length and are normally not visible in the resulting finished product.
摘要:
A process for manufacturing a continuously extruded running length of construction paneling from continuous flow sources of thermoplastic material bits and a mixture thereof with cellulose fiber bits, by successively fusing and pressure rolling even-distribution layers of thermoplastic bits, a mixture of thermoplastic and cellulose fiber bits, and, again thermoplastic bits, in respective ones of three cascaded oven chambers through which a material carrying conveyor is selectively advanced. Raw material distribution operates in concert with intermittent conveyor advance motions to provide even layer material distribution from the continuous flow sources, with each distributed layer being exposed to an oven environment to facilitate thermoplastic fusion during the time between intermittent conveyor advances and prior to subsequent pressure rolling.
摘要:
Gelled polyamides are contacted with organic hydroxyl group-containing compounds to so modify the physical nature of the gels as to permit their flushing from process equipment.
摘要:
A process for extruding a film having small variations in thickness by regulating the quantities fed to a worm press and by regulating the extrusion process. Marginal strips and waste products of extruded film are re-processed by returning these materials, slicing them and directly weighing them before being fed to the filling bin of the screw press. In order to regulate the quantities fed to the screw press, the weighed material per unit of time is continually subtracted from a nominal value set by a volume regulator associated with the raw material seeder devices. The filling degree of the screw press is measured as the mass pressure between the screw press and a constant volume pump such that the filling degree is maintained constant during the extrusion process.
摘要:
Apparatus for use in processing molten plastics is connected to a polymerisation vessel and has an outlet, a pump and three-way gate valve downstream of the pump. The three-way valve has an inlet connected to the pump, an outlet connected to the vessel and an outlet connected to the outlet of the apparatus.
摘要:
A waste disposal system includes a stock yard for storing waste articles, a pre-treatment apparatus for separating a metal bulk from each waste article fed from the stock yard, a cryogenic crushing apparatus for crushing the separated metal bulk, and a crushing apparatus for crushing the portion of the waste article other than the metal bulk. The system further includes a light-weight article separating apparatus for separating the crushed waste from said crushing apparatus into foamed material and other wastes, and a foaming agent collecting apparatus which separates the foamed material into solid plastics and gaseous foaming agent and then cools and liquefies the gaseous foaming agent.