摘要:
A continuous process for minimizing the agglomeration of freshly manufactured polyolefin pellets comprising the steps of: - feeding an aqueous stream containing polyolefin pellets to a tower, - cooling said polyolefin pellets during their upward flow along said tower by means of a downward flow of a cooling agent having a density higher than said polyolefin, - collecting the cooled pellets from the top of said tower after a residence time in the tower comprised between 2 and 20 minutes.
摘要:
Methods of making oxidation and wear resistant polymeric materials using peroxide cross-linking and high temperature melting process are disclosed. A multiple step procedure for enabling the manufacturing of such material without size limitations is also disclosed.
摘要:
Injection molding units and methods of delivering a cooled molding material to portions of an injection molding unit are disclosed. An injection molding unit can comprise a barrel having a feed zone, a feeding portion configured for dispensing a molding material into the feed zone, and a cooling apparatus configured for cooling at least one of the feed zone or the feeding portion to a temperature that is selected to avoid or reduce bridging or obstruction of the molding material. The cooling apparatus can include a jacket configured to cover at least a portion of the feed zone or the feeding portion. The injection molding unit can further comprise an insulation shield. A method can comprise feeding the molding material into the feed zone and cooling the molding material prior to dispensing it into the feed zone or while it is in the feed zone.
摘要:
Injection molding units and methods of delivering a cooled molding material to portions of an injection molding unit are disclosed. An injection molding unit can comprise a barrel having a feed zone, a feeding portion configured for dispensing a molding material into the feed zone, and a cooling apparatus configured for cooling at least one of the feed zone or the feeding portion to a temperature that is selected to avoid or reduce bridging or obstruction of the molding material. The cooling apparatus can include a jacket configured to cover at least a portion of the feed zone or the feeding portion. The injection molding unit can further comprise an insulation shield. A method can comprise feeding the molding material into the feed zone and cooling the molding material prior to dispensing it into the feed zone or while it is in the feed zone.
摘要:
Die Erfindung betrifft eine Vorrichtung zum Vertropfen eines fließfähigen Produkts mit einer Außentrommel, die drehbar auf einem Kern angeordnet ist und die auf ihrem Umfang mit mehreren Durchgangsöffnungen versehen ist, wobei in dem Kern ein in Längsrichtung des Kerns verlaufender Zuführkanal und eine am Innenumfang der Außentrommel anliegende Verteilvorrichtung vorgesehen sind, wobei zwischen dem Zuführkanal und der Verteilvorrichtung über die Länge des Zuführkanals gesehen wenigstens ein Versorgungskanal vorgesehen ist und wobei ein Absperrorgan zum Einstelleneines freien Querschnitts des wenigstens einen Versorgungskanals vorgesehen ist.
摘要:
A pelletizer particularly useful for pelletizing water-dispersible melt-extrudate, among other materials, delivered from an extruder through a die positioned in communication with the interior of the pelletizer housing. The pelletizer includes a rotor disposed inside the housing and knives mounted around the periphery of the rotor. The knives pelletize the melt-extrudate as the rotor rotates. A fluid supply system selectively delivers a fluid, such as air, to the knives when the knives are at a selected location in the housing. The selected location is preferably just past the inlet and can extend in a circumferential direction around the housing in the area of the housing which is near the outlet. The circumferential extent can vary according to the configuration of the knives and the fluid supply system. The fluid supply system supplies fluid in a radially outward direction and tangentially along the cutting edge of the knives so as to sweep the pellets from the knives, as well as cool the knives, the pellets and the interior components of the pelletizer. The selective delivery of fluid sweeps the pellets off the knives as close to the outlet as possible. This prevents fouling, as well as avoids undesirable cooling of the knives in proximity to the die, which could lower the temperature and interrupt the flow of the extrudate.
摘要:
As an easy method of producing droplets of plastic, it is proposed that free-flowing liquid plastic should be reduced to droplets by the action of vibrations, the droplets (22) thus produced being allowed to fall through a falling zone (24) into a cooling liquid (26, 34).
摘要:
A coated particulate in the form of a powder or in the form of a pellet, the particulate comprising a vinylidene chloride interpolymer and coated with at least one processing aid at a level effective to improve the extrudability of the vinylidene chloride interpolymer. The processing aid beneficially is a fatty acid, an ester, a fatty alcohol, a fatty amide, a metallic salt of a fatty acid, an olefin polymer or a polyolefin wax.
摘要:
Granulates are particularly useful in washing and cleaning products. A homogeneous premixture is extruded at high pressures through perforated nozzles and the hank leaving the perforated nozzles is transversely severed into particules having a predetermined length by a rotary cutting knife (1), so that the particles are radially hurled away from the cutting knife (1). The particles are caught in a flexible air-permeable textile fabric (2) loosely arranged around the cutting knife (1) in the area where the particles are radially hurled. Gas, in particular air, is blown into the inner space thus formed by the textile fabric (2), and the same gas is blown onto the outer side of the textile fabric (2). The granulates are thus prevented from adhering or clinging to the inner wall of the granulating hood even at very high throughputs and whatever their recipe.
摘要:
A process for cooling rubber crumb wherein the rubber crumb is presented for cooling to a first stage pneumatic conveyor containing a hot wet first stage air stream. The rubber crumb is cooled in the first stage pneumatic conveyor to a first temperature, whereupon the cooled rubber crumb is separated from the first stage air stream and transferred to a second stage air stream of cool dry air. A second stage pneumatic conveyor transports the rubber crumb in the second stage air stream for additional cooling.