Abstract: An apparatus for the continuous production of spun-bond web separates the in-lowing process air section including the aerodynamic drawing shaft at which the thermoplastic filaments form a spinneret are drawn, from the depositing section in which the filaments are passed through a diffusor and deposit in an entangled form as spun-bond web on a perforated sieve belt. The suction below the belt and the process air blower are independently controlled as part of the separation and the drawing channel forms an air lock while an air inlet gap is provided between the drawing channel and the inlet of the diffusor to further separate the two sections. The resulting apparatus has a high versatility with all products made and materials which can be used.

Abstract: A distinctive technique for making porous fiber includes a stretching of a substantially continuous fiber while the fiber is in an operative association with an effective quantity of surface-active material. The fiber can be produced from a source material which includes a thermoplastic, orientable material and at least about 0.35 weight percent (wt %) of a supplemental material. In particular configurations of the invention, the fiber may be contacted with a first quantity of surface-active fluid and at least a separate, second quantity of surface-active fluid. In other configurations, the fiber may be subjected to an additional incremental stretching.

Abstract: An improved apparatus is provided for the formation of a spunbonded fibrous web suitable for service in nonwoven end uses. A melt-processable thermoplastic polymeric material is melt-extruded to form a multifilamentary spinline, is quenched, and is wrapped about at least two spaced driven draw rolls that are surrounded by a shroud prior to collection to form a web, and is bonded to form a spun-bonded nonwoven product. The draw rolls exert a pulling force on the multifilamentary spinline so as to accomplish drawing of the molten multifilamentary spinline prior to complete solidification. The shroud makes possible the self-stringing of the spinline around the draw rolls. A pneumatic jet located at the exit end of the shroud assists in the contact of the multifilamentary spinline with the draw rolls in order to facilitate the imposition of a uniform pulling force and expels the multifilamentary spinline in the direction of its length toward a support where it is collected.

Abstract: Apparatus for drawing filament bundles present in the form of a curtain comprises an injector which is rectangular in horizontal section and which is adjoined by a drawing shaft in the form of two parallel plates. At least one of the plates comprises a plurality of pressure measuring elements arranged in the form of a grid whereby the velocity distribution of the drawing gas in the drawing shaft can be adjusted through local variation of the geometry or the amount of drawing gas in the drawing shaft.

Abstract: A method and apparatus for spinning, drawing and winding a synthetic multi-filament yarn, wherein the yarn is subjected after drawing and prior to winding to a heat treatment for purposes of reducing its shrinkage tendency. In the heat treatment, the yarn advances along an elongated heating surface closely adjacent thereto but substantially in no contact therewith. The heating surface has a surface temperature which is above the melt point of the yarn. During the heat treatment, the yarn is subjected to a tension which is lower than the tension required for plastic deformation. The yarn wound by this method has a heat shrinkage tendency which is typically more than about 20%.

Abstract: There is provided a fabric produced by a spunbond or a meltblown apparatus, wherein the apparatus has a pneumatic chamber having at least one wall containing a plurality of spaced protrusions. Preferably, both opposing walls contain protrusions aligned in staggered angled rows and the rows on one wall are angled opposite the rows on the opposing wall, thereby causing controlled lateral flow near the chamber walls. This lateral flow exhibits drag on the fibers, imparting rotational energy to the fibers. The fibers are imparted with rotational energy derived from the lateral component of the two turbulent airflow fields that oppose one another, and have a tendency to twist and crimp. Fabrics so produced have improved loft, drape, and feel and may be useable as a loop material for hook-and-loop type fasteners.

Abstract: A method and apparatus for producing a multifilament yarn by a melt spinning-draw process, and which includes applying additional heat to the melt in the region of the spinneret. The relationship between the withdrawal speed and draw ratio may be changed, and with an adaptation of other process parameters, it is possible to increase productivity. The process may be applied to continuous and discontinuous processes.

Abstract: The present invention provides a process and apparatus for collecting relatively straight blow spun fibers in a two dimensional configuration. The process utilizes a venturi to preclude the kinking and bending of the fibers until the fibers have substantially thermoset. A diffusion chamber allows the fibers to be collected without entangling.

Abstract: A capstan belt (80) is mounted on a pair of pulleys (82,83) for engagement with the surface of a draw capstan (75), the capstan belt (80) being driven for rotation on the pair of pulleys (82,83) by rotational movement of the capstan (75). A coated optical fiber (35) is drawn between the capstan (75) and the capstan belt (80). At least a surface of the capstan belt (80) is manufactured of a very low modulus material which easily deforms when contacting the coated optical fiber (35) such that the belt material deforms rather than the coating on the fiber during contact between the belt and the coated fiber. An idler belt (78) may surround the capstan (75) and an idler pulley (79), at least the surface of the idler belt (78) being manufactured of the same or similar material as the capstan belt (80). The belt material has a modulus of elasticity in the range of 10 to 200 PSI (0.07 to 1.38 MPa) at 10% strain and 200 to 5000 PSI (1.38 to 34.5 MPa) at 100% strain.

Abstract: A method and apparatus for producing stretched yarns.

Abstract: An apparatus for producing multifilaments having high fiber strength is disclosed. A spinneret melt spins a polyolefin at a first temperature into filaments. A cooling duct cools the filaments via convection at a second temperature. A chill roll, disposed downstream from the cooling duct, has a third temperature, and forcibly conductively cools the filaments. Finally, heated drawing rolls, disposed downstream from said chill roll, continuously draw the filaments at a high draw ratio.

Abstract: An apparatus 1 for widening a foam sheet S obtained immediately after heating and foaming a foam sheet which has not been yet widened, while the foam sheet S is continuously received or supplied. The sheet widening apparatus 1 comprises: a pair of chains 2 constructed in the form of endless chains composed of links 22 having pin parts 21 and a driving device 3 meshing with these chains 2 and driving the chains 2 along such loci as to widen the space between the chains 2 from sheet receiving start points to sheet receiving end points. A method for widening a foam sheet by the sheet widening apparatus 1 comprises the steps of piercing both the side parts of the foam sheet S with the pins 21 at the sheet receiving start points; widening the space of width between the pins 21 along gently curved loci by drying the chains 2 while the pins 21 penetrating the foam sheet; and receiving the foam sheet S from the sheet receiving start points to the sheet receiving end points while the foam sheet is widened.

Abstract: An apparatus and method for producing an oriented plastic strap having a predetermined desired thickness for use in connection with the strapping of packages or the like, is disclosed. A sheet workpiece is conducted into a nip defined between a pair of milling and stretching rollers wherein one of the rollers is rotated at a lineal surface velocity which is greater than the lineal surface velocity of the other roller, and the rollers are rotated in opposite directions. One of the rollers effectively brakes or retards one of the surfaces of the sheet workpiece while the other one of the rollers effectively accelerates the other one of the surfaces of the sheet workpiece as the workpiece passes through the nip defined between the rollers whereby the workpiece is simultaneously milled and stretched.

Abstract: Apparatus for effecting gauge distribution in flattened tubular plastic film has a collapsing device for collapsing upwardly vertically moving expanded tubular plastic film to a two layer flattened condition, a first motor for rotating the collapsing device through 180.degree. in each direction from a neutral position, a first horizontal film direction reverser secured to the collapsing device for rotation therewith a first horizontal turning bar located above the collapsing device and extending substantially through the central axis, a second horizontal film direction reverser, and a second horizontal turning bar located about the first turning bar. A second motor arrangement simultaneously rotates the first turning bar through 135.degree. in each direction from a neutral position, the second film direction reverser through 90.degree. in each direction from the neutral position and the second turning bar through 45.degree. in each direction from the neutral position simultaneously with the 180.degree.

Abstract: Nonwoven spun-bond is produced by a stationary pressure apparatus in which the shaft below the spinneret has an inlet section followed by the downwardly converging intermediate section, a drawing section and a diffuser opening above the collecting belt through which air is drawn by a suction device. The process air velocity profile has an intersection point with the drawing value at the intermediate section and the distance between the intersection point and the spinneret is smaller than the distance between the intersection point and the bottom end of the drawing section.

Abstract: This invention relates to a method and apparatus for producing a polyester fiber which cools a plurality of molten polyester fibers from a spinnert 2 to a temperature below a glass transition point, then takes up the fibers by a non-heating first godet roller at a take-up speed less than 4,000 m/min, heat-stretching the fibers between the first godet roller and a non-heating second godet roller 10 inside a normal pressure steam atmosphere (first heat-treating device 8) higher than the glass transition point of the polyester fiber, and heat-treats the fiber by a pressurized steam atmosphere (second heat-treating device 9) higher than 105.degree. C.

Abstract: A method and an apparatus for heating and drawing a synthetic filament yarn, and wherein the yarn receives a film of water by wetting with heated water vapor before entering into a heating chamber and so that the water vapor initially condenses on the yarn as it enters the heating chamber. To this end, a water nozzle or a hot vapor nozzle may be used, which is arranged upstream of the heating chamber.

Abstract: A spinneret device for side-by-side, conjugate melt-blow spinning can correspond to combinations of various heterogeneous polymers for conjugate spinning and is uniform in the conjugate state such as conjugate ratio between single fibers, the proportion of the peripheral percentage of both the components in the fiber cross-section, etc. and has fineness, a large nozzle plate width and a superior productivity. The device is composed mainly of a spinning resin-feeding plate; a distributing plate; a separating plate provided with confluent grooves of conjugate components engraved at the bottom part of the plate, corresponding in number to the spinning nozzles; a nozzle plate; and a plate for controlling the clearance for a gas. Even when the viscosity unevenness, spinning temperature unevenness, etc.

Abstract: A continuous process for spinning and drawing polyamide filaments with the steps of melting a polyamide and spinning the filaments from the molten polyamide through a spinnerette, quenching the filaments, applying a yarn finish to the filaments, applying steam and heat to the filaments by a steam and heating unit which consists of a steam box and at least one heated godet, drawing the filaments, and optionally texturing the filaments. The resulting filaments have low shrinkage, high crystallinity, and a high percentage of alpha crystals.

Abstract: A spun-filament nonwoven web is deposited on a sieve belt from a spinning head producing a curtain of thermoplastic filaments which traverse a cooling chamber by drawing the filaments in a drawing nozzle separate from the cooling chamber and passing the filaments through a delivery unit and in the form of a jet pump, air flow through which is controlled at least in part by a suction blower below that sieve belt.

Abstract: An apparatus for delivering and depositing groups of continuous threads or filaments, which are conveyed by means of a gas flow and which are introduced substantially parallel into a passage having a corresponding cross-section is proposed, the gas flow accompanying the threads upon entering the upper part of the passage is accelerated to high speed and is then decelerated and the threads are deposited on a moving depositing surface. The gas flow delivering the threads flows at high speed through the passage preferably provided with parallel walls and then is decelerated by the suction of part of the gas in the lower passage area laterally through openings in the passage walls.

Abstract: In an apparatus for the spin-drawing, on multiple ends, of thermoplastic filament yarns on at least two pairs of godets (1, 2 and 1', 2'), their axes of rotation (7 and 8) are arranged skew with respect to each other in such a way that the axis of rotation (8) of the one godet (2) is arranged to be able to pivot within a plane (12) and the plane (12) forms an angle (.beta.) of 10.degree.-60.degree. with the plane (10). The arrangement according to the invention makes it possible for the first time to spin and simultaneously draw in an integrated manner on multiple ends.

Abstract: An apparatus for making aromatic heterocyclic polymeric fibers having enhanced compressive strength is disclosed. Individual polymeric fibers, while being made according to otherwise conventional methods, are full twisted as they are drawn from a spinnerette hole so that their internal fibrils and microfibrils become entangled. The twisting is performed before coagulation of the fibers. The entangled fibrils and microfibrils are believed to provide mutual support to adjacent fibrils/microfibrils to resist buckling under compression.

Abstract: An air gun apparatus which permits stable, fine spinning and is capable of discharging fine filaments at a certain degree of dispersion and affording a non-woven fabric of uniform shape is provided. The air gun includes an air nozzle and an accelerator tube. The air nozzle has a filament inlet and outlet. The filaments are discharged from the filament outlet while being pulled by compressed air. The accelerator tube is formed at a specific diameter to length ratio and is connected to the air nozzle in the filament discharging direction. The non-woven fabric producing apparatus is provided with a guide tube and a separator nozzle, with an air flow rate regulator being disposed between the guide tube and the separator nozzle. The air flow rate regulator has an exhaust port for exhausting to the exterior a portion of the compressed air which is used for carrying the filaments.

Abstract: An apparatus and method are disclosed for forming a nonwoven fabric web, such as a spunbond web. The apparatus comprises a spinneret for downwardly extruding a curtain of filaments, and an underlying air drawing unit for drawing and attenuating the filaments as they move downwardly therethrough. A conveyor belt receives the drawn filaments and forms the filaments into a nonwoven fabric web. In the drawing unit, the filaments pass downwardly through a slot, and a pair of air nozzles are positioned in the slot, with one nozzle being positioned adjacent each side wall of the slot. The nozzle outlets are oriented so as to introduce each of the air streams into the slot in a direction which is parallel to the side walls of the slot, and the introduced air streams act to draw additional air into the open upper end of the slot.

Abstract: A wet-spinning process for producing filament utilizes a pair of rollers in the spinning machine which have axes which are skewed to one another, i.e. include angles in projections both in vertical and horizontal planes and so inclined that the interturn spacing of the filament decreases from the upstream wet zone to the downstream drying zone.

Abstract: The present invention relates to a novel method and apparatus for producing nonwoven fabrics. Generally, in production of nonwoven fabrics, in order to obtain a nonwoven fabric with a wide width, it has been impossible to obtain a uniform nonwoven fabric unless a large number of spinnerets ejecting fibers are installed in the width direction of the nonwoven fabric. The present invention relates to a novel method and apparatus for producing nonwoven fabrics capable of easily increasing the width of the fabric even when only few spinnerets are used.

Abstract: In a apparatus of making a nonwoven mat wherein a multiplicity of filaments are extruded in a row and a pair of jets of compressed gas are played symmetrically from nozzles upon the filaments as same are extruded to stretch the filaments and deposit same on a substrate the compressed gas is made to flow from a source along respective paths to the nozzles and each of the flows and paths is branched upstream of respective flow-equalizing stations. The speed of the respective flows is decreased and their pressures are increased with at least one diffuser. The flows are then baffled and united between the flow-equalizing station and the respective nozzles in a flow guide.

Abstract: A meltblowing system with a modular die design and on-line monitoring of web properties is described. The modular die consists of individually fed side-by-side meltblowing units. Automated control of the polymer feed rates to the units have been shown to produce a web with excellent uniformity of basis weight. The die also features a valve assembly for minimizing polymer afterflow and die tip plugging.

Abstract: A melt-spinning device comprises an essentially sealed spinning chamber (3) mounted in a gas-tight manner between a spinneret bundle (2) and a yarn suction device (7). The spinning chamber (3) is partially perforated only in the region located 150 to 350 mm from the spinneret bundle. At a winding-off speed of 5,500 m/min, the filament produced has a count irregularity less than 0.60% U.

Abstract: A process and an apparatus for producing a spun-fiber web from filaments of a synthetic polymer which includes a device for taking off the filaments and a web-depositing device with suction unit wherein the filaments are taken off mechanically by means of a take-off roll with a unit for the defined raising of the frictional force between the roll surface and the filaments, the filaments being exposed, in particular, to a vacuum and/or to pressurized air.

Abstract: For the production of spunbonded fabrics there is given a process consisting in that monocomponent or bicomponent fibers are spun from multiline longitudinal spinning nozzles mounted in rows on double spinning beams in such a way that the emerging filament rovings overlap over the entire production width, that, before depositing, the filament rovings are cooled by transverse blowing from one side and by sucking-off on their other side freed from spinning vapors, mechanically and/or aerodynamically stretched and deposited to the web.The apparatus described comprises double spinning beams with a length of 800 to 8,000 mm which carry multiline longitudinal spinning nozzles staggered to one another with high hole numbers, with lengths of the individual nozzles from 500 to 700 mm.

Abstract: In a process of manufacturing oriented tapes, which have been folded at least once, from synthetic thermoplastics, particularly for use in the manufacture of high-strength woven fabrics, the tapes are folded on themselves before they are wound on the spool used for their further processing.

Abstract: Continuous polypropylene multifilament yarns are made by melt spinning and stretching in an integral process; a sufficient number of filaments for forming at least 8 continuous filament yarns each consisting of at least 10 filaments are melt spun through a spinneret (11) at a speed of at least 400 m/min into a vertical air quenching zone or shaft (12) for solidification; the filaments are arranged to form a substantially planar array of parallel and mutually distanced yarn strands; then, the filaments are stretched to achieve substantial orientation by passing the yarn strands, while maintaining them in the array, over peripheral surface portions of a sequence of rotating cylinders (141, 142, 143, 144) having parallel axes of rotation, each strand (S) passing over surface portions along a discrete path which is substantially defined by a plane intersecting perpendicularly with the parallel axes of the cylinders; each strand is in frictional contact with the peripheral surface portions for a total contact path

Abstract: For the production of spunbonded fabrics there is given a process consisting in that monocomponent or bicomponent fibers are spun from multiline longitudinal spinning nozzles mounted in rows on double spinning beams in such a way that the emerging filament rows overlap over the entire production width, that, before depositing, the filament rows are cooled by transverse blowing from one side and by sucking-off on their other side freed from spinning vapors, mechanically and/or aerodynamically stretched and deposited to the web.The apparatus described comprises double spinning beams with a length of 800 to 8,000 mm which carry multiline longitudinal spinning nozzles staggered to one another with high hole numbers, with lengths of the individual nozzles from 500 to 700 mm.

Abstract: An apparatus for cooling melt spun filament bundles by controlled positioning of walls or air stream limiting wings in the quench chamber.

Abstract: Apparatus for extending film tube from high density polyethylene biaxially oriented in longitudinal or machine direction as well as in cross machine diameter-increasing direction, and for joining extruded closure strip carried helically on one wall of the tube correspondingly stretched as a result of the biaxial stretching to which the film of the tube is stretched. The closure-strip-carrying, biaxially oriented tube is adapted to be converted into a ribbon sheet form with the closure strip extending as individual closure strip sections across the ribbon sheet form at longitudinally spaced intervals, and adapted for making bags.

Abstract: An optical fiber drawing apparatus which includes a heating furnace which fuses a forward end of an optical fiber preform for drawing an optical fiber, and a screening portion which applies tension to the optical fiber through in-line, for guarantee of its strength. The screening portion further includes a suction device disposed along a passage of the optical fiber running through it for sucking in the optical fiber.

Abstract: The invention relates to an apparatus for calendering a plastic web extruded from a slot die, and a method of operating this apparatus, the apparatus having at least two cooled rolls, which work in conjunction, the plastic web passing through the calendering nip between them. The plastic is particularly a partly crystalline type, notably polypropylene. The slot die is arranged above the first nip, and the plastic web passing through the nip continuously comes off the first roll and passes around the second roll at about 180.degree. or more. Below the nip there is a blowing device for causing cooling gas to impinges along the entire width of the plastic web in the channel between the first roll and the plastic web coming off it.

Abstract: A method for the molecular orientation of plastic material by expanding a tube of plastic material, includes introducing the tube into a container filled with heated liquid, preferably water of a temperature of 70.degree.-100.degree. C. The tube is expanded by introducing a pressurized liquid into the tube. An apparatus for carrying out the method and a plastic material are also disclosed.

Abstract: Machined steel blocks 1 and 2 have ridges 20 facing valleys in the opposite block. Polypropylene tape 3 to be heat-treated has sliding contact transversely over each ridge on each block. The blocks are heated by heaters 4. The gap between the blocks is adjustable to suit the material being processed. The gap is large enough so that the tape passing between the blocks is not constrained to deflect from coplanarity by more than its own thickness.

Abstract: The fleece-making apparatus includes a spinning nozzle system, a cooling shaft, a stretching aperture, a diffuser shaft, a fleece delivery conveyor and a device for feeding process air and for drawing outflowing air through the fleece delivery conveyor. The process air is divided into two partial flows as it is fed into the cooling shaft on each side of the cooling shaft. The upper partial flow serves for intensive cooling, the lower partial flow for additional cooling. Both partial flows are united in the cooling shaft. The cross section of the united process air flow is constricted by air control flaps positioned wedge like on opposite sides at the entrance of the stretching aperture. The process air flow issuing from the stretching aperture is influenced by pivoting wings movable about a horizontal axis at the entrance to the diffuser shaft on both sides and also by an adjustable damper which is located either above and/or below the fleece delivery conveyor.

Abstract: The apparatus for making a spun-filament fleece from a stretched thermoplastic monofilament has a combined spinning unit made up of separate spinning units each having a plurality of spinning nozzles arranged in rows over a rectangular cross section, a blower shaft, a stretching shaft and a wire screen conveyor for the finished deposited fleece. The blower shaft is provided with air orifices for admission of stretching air simultaneously acting as a cooler. The stretching shaft has stretching shaft walls which are, if necessary, movable or adjustable with an accelerating device with a venturi nozzle like vertical cross section. At least two separate spinning units with separate groups of spinning nozzles are located above the blower shaft. At least one separating wall located between individual spinning units divides the blower shaft into separate portions for separate bands of monofilaments generated by the separate groups of spinning nozzles.

Abstract: The fleece spinning unit has a spinning nozzle system, a cooling shaft, a stretching aperture, a diffuser shaft, a continuously moving fleece receiving conveyor and a device for feeding process air and for drawing outflowing air through the fleece receiving conveyor. The cooling shaft has a shaft wall provided with a plurality of air orifices. Thus process air required for the cooling is fed into the cooling shaft and is at least partially drawn through the fleece receiving conveyor. The thickness of the spun fleece is measurable on the fleece receiving conveyor downstream of the diffuser shaft in the transport direction. A measured value/set-point comparison is made and on deviation of the measured value from the set-point the setting angles of opposing air control flaps which are located at the entrance of the stretching aperture are changed. On a positive deviation of the measured value of the thickness from the set-point the setting angle is increased.

Abstract: The process for making the spun fleece proceeds in a filament-spinning unit having a spinning nozzle system, a cooling shaft, a stretching aperture, a diffuser shaft, a continuously moving fleece recovery conveyor and a device for feeding process air and for drawing outflowing air through the fleece recovery conveyor. The cooling shaft has a shaft wall provided with a plurality of air orifices. That allows process air required for cooling to be fed into the cooling shaft. That air flow at least partially is drawn through the fleece recovery conveyor. The thickness of the spun fleece is measured on the fleece recovery conveyor in the transport direction downstream of the diffuser shaft. The measured value is compared with a predetermined set value. On deviation of the measured value from the set value the setting angle of the air control flap or flaps which are located adjacent the entrance of the stretching aperture is changed.

Abstract: The apparatus has a spinneret, a cooling shaft, a stretching aperture, a diffuser shaft, a fleece receiving conveyor and a device for feeding process air and for pulling or drawing outflowing air through the fleece receiving conveyor. The cooling shaft has a shaft wall provided with a plurality of air orifices. Process air required for the cooling is fed into the cooling shaft. The cooling shaft is provided with an upper intensive cooling region and a lower additional cooling region and suitable air flow dividing guiding walls connected to the outside of the shaft wall. Air control flaps which have an outlet gap opening to the stretching aperture and which form a wedge pointing in the feed direction of the endless filament are connected upstream of the stretching aperture to the shaft walls. The diffuser shaft is provided with pivoting wings defining the passage cross section which are each movable about one horizontal axis.

Abstract: A device for making a spun fleece has a spinning nozzle or spinneret system, a cooling shaft, a stretching gap, a diffuser shaft, a continuously moving fleece receiving conveyor and a device for feeding process air and for pulling or removing outflowing air through the fleece receiving conveyor. The cooling shaft has a shaft wall provided with a plurality of air orifices. Because of that process air required for the cooling is fed into the cooling shaft. The air flow at least partially is pulled through the fleece receiving conveyor and the spun fleece formed by the deposited endless filament loops. The deposited length of the endless filament loops is measured over the spun fleece width in the finished fleece. The measured value is compared with a predetermined set value. On deviation of the measured value from the set value the setting angles of the air control flaps pivotable about a horizontal axis which are located at the entrance of the stretching gap are changed.

Abstract: A process to obtain molecular orientations in perforated plates made of extruded plastic material includes a first heating of the plastic material at an extrusion temperature, the extruding of the plastic material in the form of a perforated plate, a first cooling of said plate, a second heating of the plate at the longitudinal orientation temperature, the longitudinal stretching of the plate, a second cooling of the plate at a temperature approaching room temperature, a third heating of the plate at the longitudinal stabilization temperature, a third cooling of the plate, a fourth heating of the plate at the transverse orientation temperature, the transverse stretching of the plate, a fourth cooling of the plate at the transverse stabilization temperature, and the final cooling of the plate.

Abstract: In the process for the production of thin, biaxially stretched films from polypropylene, the latter is melted in an extruder and extruded from a slot die over the surface of a take-off roll. The plastic melt cooled on the surface of the take-off roll into an intermediate film is temperature-treated in the region of the take-off roll in a zone and the intermediate film is subsequently biaxially stretched and heat-set in a known way. At a take-off roll temperature T.sub.W of between 10.degree. C. and 100.degree. C., blowing air of a temperature T.sub.L greater than/equal to 30.degree. C. is blown onto the film surface on the air side not in contact with the circumferential surface of the take-off roll, the duration for this temperature treatment being at least 1.5 seconds.

Abstract: An apparatus wherein there is provided a source of fiber forming material, with said fiber forming material being pumped into a die having a plurality of spinnerets about its periphery. The die is rotated at a predetermined adjustable speed, whereby the liquid is expelled from the die so as to form fibers. It is preferred that the fiber forming material be cooled as it is leaving the holes in the spinnerets during drawdown. The fibers may be used to produce fabrics, fibrous tow and yarn through appropriate take-up systems. The pumping system provides a pumping action whereby a volumetric quantity of liquid is forced into the rotational system independent of viscosity or the back pressure generated by the spinnerets and the manifold system of the spinning head, thus creating positive displacement feeding. Positive displacement feeding may be accomplished by the extruder alone or with an additional pump of the type generally employed for this purpose.