Abstract: A method and an apparatus for stuffer box crimping a spun multifilament yarn, wherein the yarn is packed in a crimping device to form a yarn plug. After cooling the yarn plug, it is unraveled into a yarn. In so doing, the position of the unraveling point is adjusted by varying the withdrawal speed of the yarn. At the same time when the withdrawal speed is varied, a signal is generated for controlling at least one of the parameters of the crimping device, which influences the formation of the yarn plug, so that it is possible to produce a uniformly crimped yarn.

Abstract: The present invention relates to a process for modifying hydrophilic polymers by mixing with a modifier, characterized in that the pulverulent polymer and the modifier are introduced continuously into a vertical, cylindrical mixer, mixed at a power of from 1,000 to 5,000 Wh/m3 of powder by means of rotating blades at a blade rate of from 100 to 300 s−1 at a residence time of 1-10 seconds, during which the powder is passed through zones having energy dissipation densities of 300-600 W/l of mixer volume.

Abstract: A method and apparatus for winding a continuously advancing yarn, wherein the yarn is wound into a package that is formed on a rotating tubular core, the yarn being traversed by a yarn guide within a traverse stroke. At the beginning of each traverse stroke, the yarn guide is accelerated within a reversal length to a guiding speed, and after traversing the traverse length it is decelerated within a second reversal length. The yarn traversing mechanism includes a belt drive system for reciprocating the yarn guide and which is controlled by a programmable control device such that the yarn guide is moved within a traverse stroke which is axially shorter than the package length and which is reciprocated between the ends of the package without changing the length of the traverse stroke.

Abstract: A yarn winding machine for winding a continuously advancing yarn into packages, the yarn being guided in a yarn traversing mechanism which includes a traversing unit and a grooved roll downstream thereof in the direction of the advance of the yarn. To transfer the yarn from a full package mounted on one winding spindle to an empty tube mounted on another winding spindle, the spindle mounting the full yarn package is moved to a doffing position and the spindle mounting the empty winding tube is moved to the winding position. The machine is provided with a yarn deflection device, which comprises a guide plate extending parallel to the circumference of the grooved roll, and a yarn guide adapted for movement in a direction parallel to the winding spindles.

Abstract: The present invention relates to a process for the preparation of hydrophilic hydrogels of high swelling capacity by (co)polymerization of hydrophilic monomers in a fluidized bed apparatus.

Abstract: A yarn traversing apparatus for reciprocating a running yarn to form a wound yarn package, and wherein the yarn is reciprocated by sequential contact with oppositely rotating rotator blades. The blades can each be driven at a variable rotational speed, so that irrespective of the position of the yarn radially along the length of the rotator blades, the traversing speed of the yarn can be controlled so as to follow a predetermined traversing speed profile, which may be constant or variable.

Abstract: A method and apparatus for controlling a yarn winding machine, wherein a yarn is wound at a constant speed to a package on a driven winding spindle. A contact roll lies against the surface of the package. To enable an increasing package diameter, the center to center distance between the contact roll and the winding spindle is changed as a function of a variation in the rotational speed of the contact roll. To this end, the variation of the rotational speed of the contact roll is measured in each of a sequential series of predetermined time intervals T and converted into a control signal for changing the position of either the winding spindle or the contact roll.

Abstract: A method and apparatus for winding a continuously advancing yarn, wherein the yarn is wound into a package that is formed on a tubular core, the yarn being traversed by a yarn guide within a traverse stroke. At the beginning of each traverse stroke, the yarn guide is accelerated within a reversal length to a guiding speed, and after traversing the traverse length it is decelerated within a second reversal length. The acceleration and/or deceleration of the yarn guide are controllable, so as to modify the yarn deposit in the package edges.

Abstract: Method of diagnosing failures in a production process of a synthetic filament yarn, in which a first process parameter dependent on the process control is continuously measured and evaluated, and in which as a function of the evaluation or course derived therefrom an indication signal is generated, there being continuously measured and evaluated at least a second reference parameter dependent on the process control, and the indication signal being generated, when an error-typical behavior is found in the first and in at least one additional parameter.

Abstract: The present invention relates to hydrophilic, swellable graft polymers which comprise, in a random distribution, from 0.5 to 50% by weight of radicals of the general formula I ##STR1## and radicals of the general formula II ##STR2## from 49 to 99% by weight of radicals of the general formula III ##STR3## containing an acid group, and from 0.1 to 2% by weight of radicals of a crosslinking agent which are derived from monomers containing at least two olefinically unsaturated double bonds, where the radicals R.sup.1 to R.sup.4, X and Y and n and m are where X and Y, independently of one another are COCH.sub.3, CH.sub.2 COOR.sup.2, COCH.sub.2 CH.sub.2 COOH ##STR4## n and m, independently of one another, are 2 to 300, R.sup.1 is hydrogen or methyl, R.sup.2, independently of one another, are hydrogen, methyl or ethyl, R.sup.

Abstract: A conveyor-belt cylinder has a jacket (1) mounted on a shaft (4) by way of a base (2) and a roller bearing (3) at each end. Each base and bearing is secured by an annular spring (15) and sealed with a labyrinth seal comprising an inner ring (7) and an outer ring (8). The spring is inserted in an annular groove (16) in the shaft. A terminating cap (12) engages the outside of an outward-facing annular flange (10) on the inner seal ring and of another outward-facing annular flange (11) on the outer seal ring. The seal rings constitute stitute a prefabricated assembly in conjunction with the terminating cap. The side of the inner seal ring facing the bearing has an annular recess that accommodates the spring.

Abstract: A method and device for measuring screw threads on tubes connecting sleeves or the like, by means of a measuring pin which is moved to measured surfaces in two mutually independent measuring directions offset by 90.degree. from each other. The two measuring directions are associated with a force direction effective as a resultant. The measuring pin further has an advance deflection in each of the two measuring directions which are annulled at the point contact of the measuring pin with the measured surfaces.

Abstract: A safety device on a quill with a sensing head fixably connected thereto interrupts a positioning motion of the quill in case of a collision of the sensing head. For this purpose there is fastened to the quill a mounting plate 6, on which rests a bearing plate on at least three balls 20. The sensing head is fixable to the bearing plate. Several switches and switching cams assigned to them are offset relative to the balls on the bearing plate. In case of a collision of the sensing head, the bearing plate is deflected relative to the mounting plate, thereby causing at least one switch to interrupt the driving motion of the quill.

Abstract: The invention relates to a process for separating dimethyl isophthalate (DMI) and dimethyl orthophthalate (DMO) and other by-products from their mixture with dimethyl terephthalate (DMT), formed in the oxidation of p-xylene followed by esterification with methanol, by crystallization from the melt.Initially, the esterification product is here distilled once or several times. The DMT-rich fraction obtained is then subjected wholly or partially to one or several crystallizations from the melt, and the DMI-DMO fraction thus obtained is at least partially removed from the system. As an alternative, the DMT-rich fraction is first recrystallized from methanol, the methanol is then evaporated from the mother liquor and the remaining residue is subjected to one or several crystallizations from the melt. The DMI-DMO fraction thus obtained is again at least partially removed from the system.

Abstract: The invention relates to a process for extracting phenols from aqueous solutions. The extractant used is a salt of an aliphatic amine, having a total carbon number of at least 10, and a strong acid.

Abstract: A measuring head for screw thread measuring machines which is capable of measuring threads of a piece to be measured which has an outer diameter with a measuring point and which may be of varied diameters within predetermined limits comprises a base plate which has a thruhole in its center, a plurality of straight support grooves. Feelers are arranged at spaced angular locations around the periphery of the hole and a centering disc is located within the hole as well as measuring elements which are similarly offset and clamping elements which are arranged at selected angular locations to engage the centering disc. The feelers and the measuring elements are carried in a measuring station which is movable along a groove which extends parallel to a straight line which intersects a measuring point on the diameter of the piece to be measured and the lowermost point of the piece at the location in which it intersects the vertical axis.

Abstract: A method and apparatus for producing a ribbon free randomly wound yarn package is disclosed, and wherein a plurality of critical winding ratios at which undesirable pattern formations or ribbons would normally occur are determined and stored in a microprocessor control unit. During the winding operation, the spindle speed and traversing frequency are monitored by sensors and are transmitted to the control unit, and the control unit computes the optimum time for rapidly changing the traversing frequency so that the actual winding ratio moves rapidly through each of the approaching critical winding ratios. The original traversing frequency is re-established after having passed beyond each of the critical winding ratios.

Abstract: The rectifier having inserts for evaporation and condensation is constructed on the basis of modules (19). Each module has a distributor channel (5) for the liquid. The distributor channel (5) is positioned above the upper rim of an evaporater (1) inclined in the direction of the module axis. The evaporator (1) ends above a guide element (13) for the liquid. The guide element (13) is inclined in the direction of the module wall (14) and ends above the distributor channel (5) of the next module. The module is furthermore provided with a guide element (2) for the vapor and a condenser (10). The condenser (10) has drain elements (11, 15) for the condensate.

Abstract: The invention relates to a process for improving the processing properties of powdery polyolefins. It is endeavored by this process to obtain a polyolefin powder which can be processed on screw extruders to an almost bubble-free product.The polyolefin powder is heated to a temperature of between 40.degree. C. and its melting point and introduced into a gap between two gap-forming elements. In this gap, the powder is compressed with a pressure of from 0.1 to 10 t per cm of gap length, and the powder so compressed is then comminuted.

Abstract: Bobbin transport devices with a swingable carrier and a bobbin receiving member adapted in a first pivot position to align with a bobbin on a winding machine, a second swingable carrier with its own bobbin receiving member which aligns with the first bobbin receiving member, a shifting member for varying the distance between the two bobbin receiving members, e.g., a piston rod adapted to engage the bobbin on a slide or trolley member for one swingable carrier, and a rack and pinion or pressurized fluid operated lift for the aforementioned structures.