Abstract: The invention provides a molded polyurethane article having internal mold release properties. The polyurethane article comprises the reaction product of an isocyanate component (I) and an isocyanate-reactive polyol component (II). The polyol component comprises an isocyanate-reactive polyol (A) having a molecular weight from 100 to about 10,000 and an effective amount of an internal mold release composition (B). The internal mold release composition comprises a silicon-containing polymer (a) and a diester functional compound (b). The diester compound comprises the reaction product of an aromatic dicarboxylic acid (i) and an alcohol having from 2 to 30 carbons.

Abstract: The invention provides a method of making a cellulose triacetate photographic film base which comprises providing a casting composition of cellulose triacetate, plasticizer, and solvent having a cellulose triacetate and plasticizer concentration of from 36% to 72% by weight, casting the coating composition at a temperature of from 40.degree. C. to 63.degree. C. unto a surface maintained at from -70.degree. C. to 21.degree. C. for a residence time from 3 to 8 seconds, in accordance with the equation Tr/Tg<1.9, where Tg and Tr are the glass transition temperature in degrees Kelvin and the temperature of the casting composition in degrees Kelvin at a point adjacent to the surface where the film base is separated from the surface.

Abstract: A process for producing a homogeneous phase melt of polyacrylonitrile suitable for extrusion molding and melt spinning, by the steps of preparing polymer/water crumb containing 30-60 wt % of polyacrylonitrile and dewatering the crumb in a molten state with stirring at temperatures above 140.degree. C. and at pressures above autogenous pressure until the concentration of the polymer in the crumb exceeds 70% by weight.

Abstract: An apparatus for extruding a weather strip having first and second function portions and a connecting portion interconnecting these function portions is disclosed. The connecting portion varies in width according to a longitudinal position along the weather strip. Included in the apparatus is a head, a main die plate which is mated with a front side of the head and which has a first opening for extruding rubber therethrough to form a first function portion, such as a mounting portion, and part of the connecting portion, a fixed die plate connected to the main die plate, and a movable die disposed in the fixed die plate. The movable die has a second opening for extruding rubber therethrough to form a second function portion, such as a sealing portion, and part of the connecting portion and is slidably received in a reception portion in the fixed die plate. A discharge rate of the rubber for forming the connecting portion is adjustable in accordance with the sliding movement of the movable die.

Abstract: A hydraulic ram operated extruder having an extrusion die from which an extradate is delivered and a motor driven cutter at the die to sever the extrudate repeatedly to produce individual pieces of extradate. The hydraulic fluid circuit including a pump and control valves delivers hydraulic fluid to the ram of the extruder at a substantially constant volume flow rate. A control device responsive to the speed of advance of the ram in the extruder controls the motor which drives the cutter to produce blanks of substantially equal volume.

Abstract: Automatic thickness profiling for use in blown film and other extrusion lines. The automatic system is integrated into an air cooling ring device either external and/or internal to the bubble or extrusion. The system has or more high resolution circumferentially variable annular air outlets which act to cool the molten resin in a circumferentially variable way. Thin slide plates remain fixed in place except when adjusted to open or close the local annular air outlet by the action of at least one scanning actuator. The actuator is positioned by control signals generated by a control computer which calculates the appropriate local dimension of the variable air outlet in response to circumferential position correlated with thickness variations detected by a film thickness sensor. The film thickness above the frost line is mechanically scanned around the extrusion.

Abstract: A polyester film having improved surface and mechanical properties is prepared by transesterifying and polycondensing a dialkyl ester of an aromatic dicarboxylic acid and a glycol to give a polyester resin, and melt-extruding and drawing the polyester resin to give the polyester film, wherein calcium carbonate, surface treated with a titanate coupling agent by adding the titanate coupling agent to a glycol slurry containing 20 to 60 wt % of ball or rugby ball shaped vaterite type calcium carbonate having an average diameter ranging from 0.01 to 3 .mu.m is incorporated during the preparation process of the polyester resin as a slip agent.

Abstract: A die head for extruding an annular body includes a mandrel having a warp portion with a number of segments spaced around the circumference of the mandrel. Heat is selectively flowed to the segments to warp the mandrel and vary the position of a die pin on the end of the mandrel in a die bushing to control the thickness of the extruded body.

Abstract: For the extrusion of extruded profiles with a color pattern or their coating with such a color pattern, a plasticized material of at least two-colors is used, which is separated into at least two partial flows. These partial flows are combined before they exit the extruding head (1), whereby the partial flows are largely maintained. These partial flows can in turn be separated into further partial flows. The extruding head (1) is equipped with a distribution plate (4) in which distribution channels (8a, b) as well as a ring channel (11) are formed as grooves, with the ring channel connected to an the exit channel (38) through a ring slot (19, 20). The plasticized material entering through the ring slot (19, 20) into the exit channel (38) coats the pre-manufactured extruded profile (39) inserted through the guidance part (13) and the die arbor (24).

Abstract: An extruding apparatus for manufacturing organically based polymer/thermoplastic products. A rotational screw cooking extruder includes an extrusion chamber having a receiving port for receiving extrudate ingredients thereinto. An ejection port is formed as part of the chamber, and a rotatable screw member is disposed within the chamber for compressing extrudate ingredients within the chamber and advancing the ingredients toward and through the ejection port. A channeling device is provided for holding a plurality of extrudate ingredients and channeling them separately and simultaneously into the cooking extruder to maintain the ingredients in a desired orientation with respect to each other at the time of their insertion into the extruder.

Abstract: This invention relates to a new and improved light-polarizing sheet comprising molecularly oriented polyvinyl alcohol containing an oriented block segments of polyvinylene and said polyvinyl alcohol. In particular, the polarizing sheet comprises a polyvinylalcohol/polyvinylene block copolymer material wherein the polyvinylene blocks thereof are formed by molecular dehydration of a sheet of polyvinylalcohol; said sheet of polyvinylalcohol/polyvinylene block copolymer material comprising a uniform distribution of light-polarizing molecules of polyvinylalcohol/polyvinylene block copolymer material varying in the length, n, of the conjugated repeating vinylene unit of the polyvinylene block of the copolymer throughout the range of from 2 to 24; the concentration of each of said polyvinylene blocks, as determined by the absorption of wavelengths ranging from 200 to 700 nm remaining relatively constant, the degree of orientation of said light-polarizing molecules, as measured by the spectral dichroic ratio, R.sub.

Abstract: A cross-head die for the manufacture of long fiber-reinforced resin structures enhances fiber loosening and resin melt impregnation of fiber bundle near its inlet. A passageway along which the fiber bundle travels is defined between the die inlet and outlet and is in communication with a resin port to allow a resin melt to be introduced thereinto so as to impregnate the traveling fiber bundle. The passageway meanders relative to the common plane so as to establish a plurality of alternating successive peak and valley portions each having a substantially constant pitch dimension as measured at adjacent crossing points of the passageway with the common plane. A first peak or valley portion adjacent to the inlet has a greater height dimension as measured from the common plane as compared to a last peak or valley portion adjacent the outlet.

Abstract: A method is provided to produce a blown film of a vinyl aromatic/conjugated block copolymer, the method including the steps of:providing an elastomeric composition, the composition comprising a block copolymer of vinyl aromatic and a conjugated block copolymer;melting the composition in an extruder;passing the melted composition from the extruder through a die, the die being a circular die comprising a circular outlet and a tapered channel leading to the circular outlet, the circular outlet having an opening width of about 10.sup.-2 inches, the taper being a linear taper of at least a one inch length, the center of the linear taper being angled away from the center of the circular outlet at an angle of at least 10.degree. from a line normal to the circular outlet, and the die having a source of gas pressure inside of the circular outlet; andcooling the extruded composition that has been passed through the die with a cooling gas stream.

Abstract: In a method for forming a cellulose tube suitable for use as a food casing, in which a solution of nonderivatized cellulose, tertiary amine N-oxide and water is extruded through a die gap and the extruded tube is downwardly drawn through an air gap while being internally cooled and then is passed into a water bath, the tube transverse direction tensile strength being increased by drawing the extruded tube through an air length of at least about five inches and exposing the exterior surface of the extruded tube to cooling air in the air gap.

Abstract: A method of forming a windshield molding which drains rainwater smoothly through the rainwater groove provided at necessary sections and having different depth in the longitudinal direction for better drainage and which can be produced simply and continuously as a single molding without the addition of cutting or other processes.

Abstract: A rotor vane and a method for fabricating the rotor vane are provided in which the vane is formed of a thermoplastic matrix material having chopped fibers uniformly dispersed throughout the thermoplastic material, with the fibers aligned to extend in directions which are approximately parallel to a radial dimension in which the vane extends. A billet formed of the thermoplastic matrix material with the chopped fibers randomly oriented and uniformly dispersed within the thermoplastic matrix material is placed in vane forming dies. The dies have an interior surface which is in the shape of the vane. The billet is placed within the dies with the longitudinal length of the billet extending perpendicular to the radial dimension of the vane being formed and completely across the axial dimension of the vane being formed.

Abstract: 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.

Abstract: A spiral die for forming a laminate includes an outer die ring, an inner die ring inserted into the outer die ring with a fit clearance therebetween, a plurality (m, a positive integer greater than 1) of spiral grooves each having a gradually decreasing depth disposed between the outer and inner die rings, and distribution paths for distributively introducing melted resin streams of a plurality (n, a positive integer satisfying n<m) of resin species in a prescribed order into said plurality (m) of spiral grooves. The individual resin streams distributed to the spiral grooves proceed along the spiral grooves to gradually overflow the respective spiral grooves and overlie each other in a prescribed order before the individual resin streams form a uniform tubular stream in a die axial direction.

Abstract: The present invention provides a reinforcing structural rebar. The rebar comprises an inner core formed by pultruding reinforcing fibers through a bath of a first resin material, the inner core typically containing at least about 40 percent by weight reinforcing fibers and an outer cladding of a corrosion resistant and reinforced second resin material.

Abstract: The present invention provides a method for making medical devices, especially stents, catheters, cannulas, plugs and constrictors, by treatment of ionically crosslinkable polymer compositions with crosslinking ions.