摘要:
The present invention relates to a process for producing free-flowing, agglomeration resistant amorphous poly-alpha-olefin based adhesive pellets. The process includes (a) extruding the adhesive through an orifice of a die plate immersed in a cooling fluid; (b) cutting the adhesive into a plurality of pellets in the cooling fluid; (c) solidifying the pellets at a temperature range of about 25° C. to about 40° C. for at least 30 minutes; and (d) separating the pellets from the recrystallization fluid and drying the pellets. The pellets harden at least three folds faster than conventionally formed pellets.
摘要:
A system and method for directing a fluid through a die. A transfer device for a fluid (e.g., a cooling fluid or a material) may extend through an interior of the die. The transfer device may be situated such that undesired heat transfer with other portions of the die is limited.
摘要:
The present invention relates to improving the after-cooling process of preforms from the injection molding process in respect to its efficiency and its economy.
摘要:
A method for making a biosoluble collagen or gelatin ophthalmic shield, which optionally contains a pharmaceutically active agent, by casting collagen or gelatin in a mold; chilling the mold with the collagen or gelatin shield until the shield is strong enough to allow the mold to be opened without deforming the shield in one half of the mold; drying the collagen or gelatin shield while it is still in the mold; and then cross-linking the collagen or gelatin shield to achieve the desired solubility. The resulting shield can be worn comfortably in the eye and leaves no observable material after complete dissolution and drug release.
摘要:
A process for preparing pigmented PVdF-based powder coating products is disclosed, which comprises the steps of (i) mixing PVdF resin with a compatible thermoplastic resin, preferably PMMA in a weight ratio of about 80:20 to 40:60, with pigments, and with a small amount of flow promoter, (ii) pelletizing the mixture of (i), and (iii) cryogenically grinding the pellets and sieving the large particles. Also disclosed is a process for coating a substrate, comprising the steps of (a) applying the above prepared powder coating product on a substrate, and (b) subjecting to a heat treatment.
摘要:
A method is provided for the production and processing of mixtures of pluralities of components based upon reactant synthetic resins, wherein the mixture or at least a part of the components thereof is cooled by addition, and mixing in, of cryogenic liquid gas before or during the subsequent treatment of the mixture until a temperature is reached which allows an essentially dry treatment subsequently. The reactant plastic mixture can be cooled in the liquid state by cryogenic liquid gas to provide granulation or pulverization by cold shock. The mixture can also be cooled by the introduction thereof into a bath of cryogenic liquid gas. The mixture can also be sprayed under pressure, with the sprayed particles then being cooled directly, or indirectly, by cryogenic liquid gas.
摘要:
Rubber granulate is cold milled in a pinned disk mill having a fast moving disk and a slow moving disk with the number of pins in at least the outer row of the fast moving disk being half the number of pins in the corresponding rows of pins of the slow moving disk.
摘要:
An apparatus for the cooling of objects comprises an upright cylindrical housing having thermally insulated walls and a helical ramp surrounding a column in the housing and along which the objects pass downwardly from an inlet to an outlet. During movement along the ramp, which may be vibrated or oscillated to promote the downward movement of the objects, the latter are chilled to embrittlement temperatures. When the objects are vehicle tires, the pitch of the helical ramp is slightly greater than the diameter of the largest tires to be processed. At the bottom of the ramp the objects may pass into a bath of liquified gas serving as the cooling medium and nozzles can be provided along the lower third of the column for directing jets of the liquefied gas at the objects to be cooled.
摘要:
Fins or ridges are removed from molded workpieces by insertion into a rotating drum where they are subjected to the action of free hanging chains each mounted at one of its ends to the inner wall of the drum. Each chain has a length no greater than the inside diameter of the drum.
摘要:
A blow head assembly for a blow molding machine having a rotating blow pin and a mechanism for simultaneously injecting cooling gas and air into the interior of the parison.