摘要:
A gel reduction device 1 of the present invention includes a gel reduction mechanism 8 provided in a polymer flow duct 5 in which a polymer kneaded compound flows and adapted to reduce gel present in the polymer kneaded compound. The gel reduction mechanism 8 includes at least one or more squeezing flow paths 10 having a flow path cross-sectional area smaller than the polymer flow duct 5, and a squeeze ratio S1/S2 of the squeezing flow paths 10 is set to be 25 to 180 so as to be able to generate an extensional flow in the kneaded compound flowing in the squeezing flow paths 10.
摘要:
An apparatus for intermittently manufacturing a raw rubber strip comprises a screw extruder, an extruder head having a preforming nozzle, a gear pump therebetween, a pair of calender rolls, a roll-gap changer for switching between a close state and an open state of calender rolls, and a controller for controlling the gear pump, the calender rolls and the roll-gap changer to let the calender rolls in the open state prior to the stopping of the rotation of the calender rolls.
摘要:
A biaxially oriented polyester film having: an equilibrium moisture content of from 0.1% by mass to 0.25% by mass; a difference between moisture contents measured at 10 cm intervals of from 0.01% by mass to 0.06% by mass; a degree of crystallinity of from 30% to 40%; a concentration of terminal carboxyl groups of from 5 equivalents/ton to 25 equivalents/ton; and a thickness of from 100 μm to 350 μm.
摘要:
A process for producing an elastomeric compound, includes: feeding at least one elastomeric polymer and at least one reinforcing filler to a mixing apparatus including at least one batch mixing device; mixing and dispersing, in the at least one mixing apparatus, the at least one reinforcing filler into the at least one elastomeric polymer, so as to obtain a first elastomeric compound; discharging the first elastomeric compound from the at least one mixing apparatus; feeding the first elastomeric compound to at least one continuous mixing device, said continuous mixing device including at least two rotating screws; mixing the first elastomeric compound in the at least one continuous mixing device, so as to obtain a second elastomeric compound; and discharging said second elastomeric compound from said at least one continuous mixing device.
摘要:
A method according to the invention comprises an extruding step of extruding molten resin from a die in a belt shape, a molding/cooling step of cooling and solidifying the extruded resin sheet while molding the same in uneven thickness by nipping the same between a mold roller and a nip roller, and a slow cooling step of slowly cooling the resin sheet peeled off the mold roller, and at least the former part of the slow cooling step has a substep of slowly cooling the resin sheet while holding the resin sheet in the original warp-free uneven thickness shape while so applying an external force to the resin sheet as not to obstruct the carriage of the resin sheet.
摘要:
The present invention provides a gear type extruder for rubber, which is capable of preventing deterioration of tire uniformity level such as RFV caused by pulse-like changes in rubber extrusion rate during extruding a ribbon-shaped rubber from the gear type extruder. Gears 11, 12, 21, 22 are structured as helical gears, of which flow rate profiles, representing temporal changes in discharge flow rate of rubber discharged by the tooth of respective gears, are respectively represented by a trapezoidal profile constituted of a flow rate monotonously increasing portion, a constant flow rate portion following the monotonously increasing portion, and a flow rate monotonously decreasing portion following the constant flow rate portion. Further, the helical gears are arranged such that, in a pair of flow rate profiles formed sequentially by adjacent tooth, the flow rate profiles overlap each other only in the flow rate decreasing portion of the flow rate profile formed earlier and the flow rate increasing portion of the flow rate profile formed later.
摘要:
A strand shaping part for connecting an extruder (1) to a granulating system has a number of supply channels (8) that can be flow-connected to the outlet (5) of the extruder (1). These supply channels lead to gear pumps (21) which have a delivery behaviour that is as constant as possible and with which the flow of melt to channels (11) can be blocked during start up. A single channel (11) leads from each gear pump (21) to a strand die (9) that can be formed by holes of a perforated plate (10) which is connected to a perforated plate head (7). Several gear pumps (21) are driven by a common shaft (24).The method for starting a granulating system provided with a strand shaping part of the aforementioned type provides that the extruder (1) is first started until a sufficient pressure is built up at the inlet (27) of each gear pump (21). Once this pressure is reached, each gear pump (21) is started again. In an underwater granulating system, the granulating blades (12) are rotationally driven last (FIG. 1).
摘要:
A continuous rubber-ribbon extruding system includes at least a first continuous rubber extruding machine and a second continuous rubber-extruding machine. The first continuous rubber extruding machine includes: a first extruder for kneading and extruding a rubber material supplied thereto; a strainer for removing foreign substances from the rubber material supplied from the first extruder; and a first forming nozzle for extruding a rubber ribbon as a pre-process product. The second continuous rubber extruding machine includes: a second extruder supplied with the rubber ribbon as the pre-process product and operative to knead and extrude the rubber material; and a gear pump for delivering the rubber material, supplied from the second extruder, to a second forming nozzle which continuously extrudes a rubber ribbon to be used for building a tire.
摘要:
A multilayer polyolefin foamed sheet comprises a foamed layer and a non-foamed layer. The foamed layer is composed of polyolefin and the non-foamed layer is composed of one of the polyolefins, a polypropylene with a long-chain branch and a polyolefin-based adhesive resin with a long-chain branch. In another aspect, a multilayer polyolefin foamed sheet comprises a foamed sheet having at least one polyolefin foamed layer and a gas barrier resin sheet having at least one barrier resin layer laminated thereon, wherein the gas barrier resin sheet has a thickness of from 10 to 300 nullm and has a thickness distribution, Tmax/Tmin, of from 1 to 1.2 in an area of at least 25 cm2.
摘要:
A process for producing a thermoplastic elastomer composition comprising the step of feeding bulky rubber, a thermoplastic resin and an additive to an extruder, and then melt kneading the bulky rubber, the thermoplastic resin and the additive in the extruder, wherein the feeding amount of the bulky rubber is controlled by a method comprising the steps of: (1) measuring the amount of the produced thermoplastic elastomer composition at an outlet of the extruder, (2) calculating the feeding amount of the bulky rubber by deducting the feeding amount of the thermoplastic resin and the additive from the amount of the produced thermoplastic elastomer composition measured in the step (1), and (3) controlling the feeding amount of the bulky rubber based upon the feeding amount of the bulky rubber calculated in the step (2).