Abstract: Arrow fletchings (42,102) disclosed have curved vanes (50,114) inclined inwardly in a rearward direction to provide pockets (54,118) for restricting air flow while allowing vane flexing in a manner that moderates drag in response to wind changes. One fletching embodiment (42) is preferably made by plastic extrusion and a subsequent heat forming process and includes a vane (50) whose inner portion projects radially from its foot (44) and whose outer portion define its curved pocket (54). Another fletching embodiment (102) made from sheet plastic includes a vane (114) that projects tangentially from the arrow shaft on which its foot (104) is mounted and is curved to define the pocket (118) that restricts air flow. A fixture (68) for heat forming the pocket of the one fletching embodiment (42) and a method for making the other fletching embodiment (102) are also disclosed.

Abstract: The invention relates to a process and an equipment to obtain a plate provided with holes directly by extruding plastic materials. The process consists in submitting the material coming out of an extruder head to expansion stresses according to more than one direction and in executing a plurality of perforations in said material submitted to expansion by means of perforating means; the equipment consists of a plurality of perforating devices provided with a reciprocating motion so that they can reach an interference position with respect to the material coming out of the extruder head and of means which, acting at the same time as the perforating devices, are suitable to produce an expansion of the extruded material.

Abstract: A system and a method for the production of thermoformable plastic foam material from a mix of plastic foam selvage and a foamable virgin plastic resin. Accordingly, the present invention provides for a selvage formed during the production of thermoformed foam material articles from a plastic foam sheet stock is recycled and admixed with the virgin foamable plastic resin, in that the material components are admixed in a feed hopper and then conducted from the feed hopper into a twin-screw compressor which will impart a positive forward feed to the compressible plastic materials conveyed therethrough.

Abstract: Striped detergent bars can be manufactured by several methods. The application of torque to a striped extruded log provides a bar with a spiral striping. The present invention proposes reversal of torque so that a sinusoidal striping is present on the bar.

Abstract: An apparatus is disclosed for preparing a tubular parison, which is continuously extruded in an extrusion direction from an extrusion head, and for subsequently transferring the parison to a blow molding machine. The apparatus provides improved control of the wall thickness of the parison and can be used with particular advantage in making articles requiring parisons of large diameter and length. The apparatus includes a parison stretching mechanism that grasps and seals the parison at one location along its length and stretches the parison at a controlled rate while being extruded in the extrusion direction. The apparatus also sequentially severs sections of the parison from the remaining continuously extruded portion and transfers each section to a stationary blow molding machine out of the path of this remaining portion.

Abstract: A pallet has at least one board secured to a plurality of like elongated parallel stiffening ribs having flat upper sides secured to the board and lower sides formed with downwardly projecting and longitudinally spaced bumps. These ribs are each formed by filling into an upwardly open elongated mold of generally regular cross section a mass of coarse and fine particles and a binder in such a manner that the fine particles are concentrated in the lower portion of the mass and the coarse particles are concentrated in the upper portion of the mass. The mass is then compressed downwardly in the mold to a relatively great extent at several longitudinally spaced-apart locations and to a lesser extent therebetween to form upwardly projecting bumps or feet between these locations. The thus compressed mass is cured into a stiffening rib which is inverted and has the board secured to its planar upper surface opposite its feet.

Abstract: A sweep ell production apparatus (10) receives extruded plastic pipe (98) from an extruder (96). The plastic pipe (98) is passed through a curved sizing sleeve (100) which imparts a curvature to the plastic pipe (98) while at the same time sizing the pipe wall thicknesses and exterior diameter. After the pipe (98) passes through the sizing sleeve (100) a clamp (84) is secured about the periphery of the pipe (98). The clamp (84) is driven by means of a motor (34) which causes the clamp (84) to travel along an arc (112) which corresponds with the radius of curvature of the sizing sleeve (100). As the clamp (84) draws pipe (98) along the arc (112) of travel, the pipe (98) is set to have the desired radius of curvature. After a selected arc length of pipe (98) is produced, the pipe section is cut to produce the desired sweep ell.

Abstract: A method for manufacturing cleaving split tiles from a continuous extrusion including forming a plurality of internal channels during extruding followed by the shaping of the corners and exterior surfaces of the extrusion and forming shaped vertical surfaces defining two of the tiles sides so that they blend with the other shaping of the extrusion with the formation of the vertical surfaces occurring so that the internal channels are not compressed. The extrusion is severed along a vertical groove formed when the vertical surfaces are formed with the severed portions being subsequently fired and thereafter split into tiles.

Abstract: A method is disclosed for substantially removing surface defects that are attendant with plastic blanks formed by cutting out squares from sheet stock material that are subsequently forged by means of non-melt, high pressure or solid-phase forming of preforms and thereafter thermoforming said preforms into containers. The blank itself comprises a tabular body having a pair of major faces located substantially parallel to one another, minor faces integrally formed and extending outwardly from said major faces, said minor faces presenting a smooth surface commensurate to that of said major faces, and a vertical portion integrally formed with said minor faces and defining an outer peripheral band or line having an unsmooth surface.

Abstract: Process for forming a scrim-reinforced film wherein a molten, film-forming plastic, such as polyethylene, in a high state of fluidity is fed onto an unsupported scrim and solidified by cooling to produce a scrim at least substantially completely enclosed and surrounded by the plastic. The film, thus produced, can be formed into a high strength bag container by a folding and cutting operation utilizing hot knife means capable of fusing and thus sealing the plastic. In a preferred embodiment, the plastic is extruded onto the scrim.

Abstract: Tubular products are provided by applying a first, inner plastic layer onto a core wire and by applying a wire sheathing onto the first plastic layer as a continuous structure thereon. The wire sheathing is then locally removed to provide defined, spaced areas without wire sheathing and intermediate areas including the wire sheathing, and the structure thus provided is covered by applying a second, outer plastic layer thereon, thereby providing a strand structure. As a next step, this strand structure is cut at one limitation of each area without wire sheathing, whereby strand pieces are provided having one end portion which has no wire sheathing therein. The core wire piece left in each strand piece is then removed, thereby providing a tubular product having a body portion including wire sheathing and being completely integral with an end or tip portion without wire sheathing.

Abstract: A process is provided for preparing self-crimpable monocomponent fibers by the sequential steps of melt-spinning a polymer of polyhexamethylene adipamide or polycaproamide into filaments, quenching the filaments by a cross-flow of air to an average surface temperature of about 40.degree. to 130.degree. C., applying an effective amount of water to the filaments while they are in said temperature range, and then drawing the filaments at a draw ratio of at least 1.3:1 to obtain a tenacity of at least 1.3 gpd, a break elongation of less than 120% and a latent, substantially helical, frequently reversing crimp of at least 6 filament crimp index. The novel products of the invention, which include fibers and yarns, in self-crimpable or crimped condition, are particularly suited for use in carpets.

Abstract: Sticks of foamable thermoplastic material are provided with grooves in at least one surface. These grooves extend width-wise of the stick. In addition, the grooves are disposed in equi-spaced relation along one surface of the stick, or in spaced-apart series or groups on only one surface, or in series or groups on opposite surfaces and in spaced-apart relation. Upon foaming, the sticks form foamed elements of various shapes, each of which has at least one curvilinear portion such as, for example, a corkscrew shape, an annular shape or shapes with reverse bends.

Abstract: A method of producing an endless toothed belt of synthetic or plastics material, or similar extrudable material, having a wire- or thread-like reinforcing insert which extends in the circumferential direction of the belt and having a fabric cover covering the toothed side of the belt. A finite belt strand is formed in a closed mold cavity from introduced liquid plastics material and from a fabric strip which is introduced along that shaping surface of the mold cavity which forms the toothed side of the belt strand, thus coating the toothed side of the belt strand with the fabric strip. That side of the belt strand which is remote from the toothed side of the belt is provided with a plurality of grooves extending in the longitudinal direction of the belt strand.

Abstract: In the process, the strands, which are spun as a fused mass, are initially drawn, then preferably stretched, crimped or textured, and converted into helical windings. The helical windings are laid down on an endless conveyor formed by two conveyor belts laterally spaced from each other. The laid down helical winding turns are then cut between the two endless conveyors to produce two substantially identical fiber lengths from each helical winding turn. The melt spinning of the strands may be effected at such a high speed that the drawing of the filaments or fibers can be omitted. The helical winding turns, prior to cutting thereof, may be subjected to at least one after-treatment. The apparatus includes a rotary distributor into which the crimped strands are supplied substantially axially for conversion into helical winding turns, and includes endless belts tangentially engaging the helical winding turns to move the same downwardly onto the spaced pair of endless conveyor belts.

Abstract: A picture frame and method of making the same from a rising tube of fluent extruded plastic. The rising tube collapses inwardly to form the frame body as a ring of interfolded wrinkly sinuous corrugations. A stepped annular ring on the face of the extruder die is shaped to form a flat back for the frame along with a rabbeted inner rim edge suitable to seat a picture, mat and a backing plate.

Abstract: A method of manufacturing thin-walled articles by thermoforming from crystalline thermoplastic sheet or web material wherein the sheet or web is rapidly precooled from extrusion temperature, and the outer surface layers reheated prior to thermoforming.

Abstract: A method for manufacturing thin-walled articles from crystalline thermoplastic material comprising the steps of extruding a continuous web of hot crystalline thermoplastic material at an extrusion temperature above the crystalline melting temperature range of the material, substantially immediately rapidly precooling the opposite surfaces of the web to form therealong thin supportive layers having a temperature in the range wherein the said material is not further plastically deformable and wherein further growth of crystals is essentially avoided, while the hotter core material between said layers is cooled to a temperature adjacent to but above the crystalline melting temperature range and is held in a substantially crystal free condition, transporting the so precooled web into a thermoforming station within a sufficiently short time period to essentially maintain over the web thickness the above mentioned temperature profile produced by precooling, and then thermally forming at a rapid cooling rate said we

Abstract: A process for preparing electrostatographic toner particles having improved mechanical properties and controlled particle size and size distribution is provided through molecular orientation of glassy, brittle, semicrystalline, low molecular weight polymers. Molecular orientation results in more flexible polymers and greatly increases their yield stress, modulus and mechanical fatigue lifetime. The molecular orientation of these polymers is obtained by extrusion of fibers or films thereof.

Abstract: A decorative grass or grass-like product in the form of strips of plastic material of predetermined dimensional characteristics having color, anti-static agents and flame retardants incorporated therein prior to extrusion of the resin thereby preventing rub off of the color, minimizing clinging of grass to the hands and clothes of a decorator, thus facilitating handling of the grass, and assuring that the grass will consistently exceed the flammability requirements of the Federal Hazardous Substances Act Regulations in order to be labeled "non-flammable". Processes for making the grass include an extruder for plastic material and including a film extrusion die or a strand extrusion die. When a film is extruded, the film is cooled and slit longitudinally into strips of predetermined width. In another process, the extruded strips or strands are cooled.

Abstract: Novolak phenolic resin compositions are formed into molding granules by homogenizing the composition above the melting point of the resin, calendering the homogenized composition with conversion into a coherent sheet, rolling the sheet between a pair of rollers, at least one of which is indented, to produce a coherent embossed sheet, fracturating the embossed sheet with separation of the granules having substantially the shape and size of the embossments, coating the granules with a phenolic compound and heat-treating the coated granules by flowing a stream of inert gas having a temperature not exceeding 130.degree. C.The resulting granules are free-flowing, free from a tendency to release dust and particularly suitable for injection molding.

Abstract: Process by which moulded articles are maufactured from clay. A continuously produced strand of the material in question is sprinkled with sand, whereafter at one location a piece is severed from the end of the strand at regular intervals, by a cutting apparatus, which piece then enters a mould. In the course of all phases of the process the strand and each severed piece thereof remain directed along one vertical downwardly directed line of movement.

Abstract: A process for the production of crimped filaments of semi-crystalline polyolefins or blends of polyolefins with other materials by melt drawing at 100 meters per minute or less, rapidly and asymmetrically cooling at least a portion of the filaments, forming the filaments into a tow and subjecting the tow to a heat treatment without drawing at at least 100.degree. C. and thereafter drawing the filaments in two stages, the last of which is at a temperature of at least 70.degree. C. With the practice of the process of this invention, there is provided a useful crimp of at least two crimps per centimeter which develops after the filaments are relaxed and subjected to a further heat treatment which may be applied either to the filaments or to products produced therefrom when in a relaxed state subsequent to drawing.

Abstract: New, flexible intumescent protection sheeting of unusually uniform thickness have been prepared from epoxy-polysulfide compositions containing microfibers and the ammonium salt of 1,4-nitroaniline-2-sulfonic acid, as disclosed in U.S. Pat. No. 3,663,464, except that an ammonium salt particle size in the order of 5 to 8 microns and a fiber size of about 1/128th inch in length and 3 to 5 microns in diameter have been found critical to obtain the required density of 1.46 to 1.50 g/cc. The insulation sheeting is prepared by a continuous process involving vacuum mixing, calendering, and curing under very strict conditions which depend to some extent upon the thickness of the sheet produced.The resulting flexible sheet can be wrapped easily and tightly around small diameter missiles, thus affording them for the first time, protection from fire for at least 5 minutes.

Abstract: A method of and apparatus for separating off waste material from a moulded article in the production of hollow articles of thermoplastics material by a blowing process in a multi-part mould involves pinching together regions of a partly-made article during closure of the mould parts around it and once a satisfactory weld seam has been created at the pinch regions then increasing the closure speed of the mould parts. Control of the mould closure speed may be effected by open loop control or by automatic control, and may be made dependent on time and/or on displacement of the mould parts. The increased final closure speed can with advantage be equal to the mould closure speed at which the mould parts are moved up to the beginning of the pinching process.

Abstract: The invention relates to a method for producing ceramic tiles with ornamental shapes from clay emerging from an extrusion press. Shaped punching tools are disposed on either side of the clay column from which the tiles are to be formed, and are moved on a carriage in the direction of the moving column at a speed corresponding to the speed of the moving column. Supports hold the clay while it is being punched. A drive system such as a fluid actuated drive system moves the punching tools, and the drive system is selectively actuated in response to movement of the carriage. Cutting wires sever each column section acted upon by the punching tools from the rest of the column.

Abstract: The specification describes a method for the production of densely sintered large ceramic plates of small thickness. The ceramic composition is first extruded by means of an extruder and is then rolled out from the resulting billets in a direction perpendicular to the extrusion axis, this rolling operation is carried out by a further rolling out operation in the axial direction of the billets. The cutting out of the plates to the desired format is by means of a pressing knife acting perpendicularly with respect to the plate plane. Following this the plates are dried and fired.

Abstract: Method for making hollow plastics insulating wall panel. The plastic material, in a flowable form, is continuously forced about a core to form an enclosed central cavity or chamber. The continuous plastic material is then severed and cavity sealed in a vacuum environment before final curing of the resulting hollow insulation product.

Abstract: The thickness of a cut length of a continuously extruded elastomer is controlled by sampling the weight of a section of the continuous extrusion at a running-weigh-scale each second; computing and storing one-minute averages of the running-weigh-scale samples; sampling the weight of a cut length of the extrusion at a check-weigh-scale; comparing the check-weigh-scale value to the oldest stored running-weigh-scale one-minute average to obtain a targeted average; comparing the targeted running-weigh-scale average to the newest stored running-weigh-scale one-minute average to obtain a deviation from the targeted value if one exists; and converting the deviation from the targeted running-weigh-scale value to a control signal for increasing or decreasing the speed of a take-away belt positioned at the extruder exit orifice to vary the thickness of the extrusion in accordance with the deviation control signal and the speed of the belt.

Abstract: A continuous process for making endless toothed belts using a reinforced toothed belt preform of indefinite length by spirally winding the preform around toothed wheels spaced a variable distance while fusing the spiral wraps into a belt tube. One of the wheels forms a closed arc shaped mold chamber sealed toward the outside by a molding belt with one end of the chamber sealingly closed by the entering length with the laterally exiting flexible length or tube advancing axially through the other end and cut to the desired width to form individual belts. The circumferential length is varied by varying the distance between the wheels. The preform can be accurately formed from an unfinished belt by fusing around the fixed radial distance supported reinforcement using wheels in cooperation with a closed chamber prior to forming the tube.

Abstract: A method for making a plastic, relatively flexible stringer for a slide fastener is disclosed. The stringer blank is extruded in a relatively rigid U-shaped form and, subsequently, a plurality of longitudinally spaced, transverse slots are die cut in the stringer blank in order to provide a series of transverse, substantially parallel ladder-like portions wherein each of the ladder-like portions includes an interlocking head member. A plurality of longitudinally spaced apart seats are also formed by a die cutting step in order to define neck portions of reduced thickness about which the stitches are placed in order to secure the fabric to the stringer.

Abstract: A method for producing an article-catching strip consisting in starting from a preferably extruded strip of material provided on at least one side with longitudinal ribs and in cutting across said ribs notches defining between same substantially hook-shaped elements adapted to catch a similar strip or a piece of fabric. The invention covers also the corresponding arrangement which includes an extruding machine, a drum or the like guiding means feeding the ribbed strip to a cutting system beyond which the strip provided with its article-catching elements may be stretched in a drawing frame to more widely space said elements.

Abstract: An improved process is provided for producing cigarette filters comprised of a substantially open-cell foamed thermoplastic polypropylene resin wherein a mixture comprising a thermoplastic polypropylene resin, a volatile blowing agent and a nucleating agent is extruded through a die to produce a strand of foamed resin with the strand then being cut into individual filter elements. The improvement comprises employing as a primary nucleating agent from 0.1 to 40 percent by weight, based on the weight of the resin, of a particulate compound of a metal selected from Groups IIA, IIIA or IVA of the Mendeleef periodic table of elements together with from 0.01 to 5.0 percent by weight, based on the weight of the primary nucleating agent, of a synergist consisting of an organic compound having a hydrophobic group and a hydrophilic group. A particularly effective combination is the use of calcium carbonate as the primary nucleating agent and potassium benzoate as the synergist compound.

Abstract: In the manufacture of oriented hollow articles made of thermoplastic material by the steps of extruding a continuous hot tubular parison of thermoplastic material; pre-blowing such parison in a pre-blowing mold to produce preforms having a cylindrical body with a diameter not more than 20% greater than that of the parison; thermally conditioning the resulting preforms at a temperature sufficient to cause orientation of the thermoplastic material when it is being stretched; and effecting a final blow-molding of the thermally conditioned preforms, the mechanical properties of the resulting articles in the vicinity of their base are improved by carrying out the pre-blowing step while holding each parison tightly between two half-molds defining a cavity which has the shape, at the location of the base of the preform, of a quarter sphere of diameter equal to that of the preform, and cutting off the resulting flash by means on an elongated blade having a semicircular cross section and a diameter corresponding to th

Abstract: A column of striated soap extruding from a plodder nozzle is subjected to torque for obtaining spiral striations in the final soap bar.

Abstract: Wraps to hold line guides on a fisherman's rod are formed as sleeve-like units by the embedment of a length of wound thread in a clear, elastomeric plastic resin, or by forming a cylindrical sleeve of elastic plastic resins. The sleeve-like wraps are expanded in diameter by an expanding tool and then chilled, or "frozen" to remain in an expanded state after the expanding tool is removed, and while expanded, the wraps are fitted onto a fishing rod and over the feet of line guides on the rod. Thereafter, warming of the frozen wraps to ambient temperatures permits them to contract to their original size to fit tightly upon the rod. A turret type of apparatus including expanders is provided to receive, expand, freeze and permit removal of the expanded wraps from the expanders for production assembly operations.

Abstract: A process is provided for the manufacture of filament yarns having fine protruding filament ends, which comprises subjecting filament yarns, wherein at least part of the filaments consist of polymers the lateral bending resistance (Knickscheuerbestandigkeit) of which can be thermally influenced, to an intermittent sectional treatment, thus ensuring that determined sections of the filaments have a low lateral bending resistance, and by subsequently breaking these sections of low lateral bending resistance by transverse stress, which causes formation of the desired free filament ends.

Abstract: An improved method for reclaiming waste plastic materials generated during an extrusion coating operation. A rotating funnel or other device is used to gather the hot molten plastic waste material and twist it into the shape of a rope. The plastic rope is passed through a cooling bath and one or more pinch rollers. After passing through the rollers, the plastic rope is spooled, chopped, or fed to a plastics processing machine.

Abstract: Self-gripping devices are disclosed and include a base having one or more integral trains of generally upright gripping elements which are adapted to penetrate and become lodged in a receiving material and especially receiving materials containing fibrils to form a self-gripping connection. The gripping elements in each train have a common origin in a continuous rib integral with the base. Self-gripping devices having a plurality of gripping elements capable of unique self-gripping action are also disclosed.A method is disclosed wherein a structure is formed with integral ribs which are cut to form spaced apart gripping elements.

Abstract: A process for making a plastic pirn sleeve bearing rows of circumferential fine grooves having flush ends to prevent filament entangling is disclosed. The process involves indenting the external surface of a thermoplastic tube by adjusting the temperature of the external surface of the tube to a temperature above its softening point, rolling at least three die wheels each in a separate path along the length of the surface of the tube while the tube is supported on a mandrel and at the same time pressing the die wheels against the surface of the tube to form permanent indentations therein.

Abstract: A process is provided for the manufacture of filament yarn having protruding filament ends on the basis of synthetic high polymers by melt spinning of the polymers through spinning nozzles, which comprises subjecting the multifilaments still hot after having left the spinning nozzle to a section cooling which causes determined sections of the single filaments to have a different molecular structure, and by subsequently drawing the filaments in a ratio which is greater than corresponding to those filament sections having a lower drawing ratio, and smaller than corresponding to those filament sections having a higher drawing ratio, thus causing the formation of determined breaks which supply the desired fiber ends.

Abstract: Methods of making continuous length articles of reinforced plastic material includes passing rovings of temperature resistant material through a crosshead extruder to impregnate the rovings with a thermoplastic polymer under high pressure. The impregnated rovings are pulled from the extruder through a die and are cooled and shaped into a void free article having a desired cross-sectional shape.

Abstract: A plurality of molds, each consisting of a pair of relatively movable mold halves, are mounted on a turntable equidistant from the center of turntable rotation, and are moved successively through a receiving sector where they engage and grip a workpiece such as a heated tube fed tangentially to the circular path of movement of the molds. Positioning pillars located on each side of a workpiece cutting device mounted between adjacent molds, engage the workpiece and correct the attitude thereof relative to each receiving mold and to each cutting device, which also is equipped with means for gripping the cut ends of the workpiece when each mold is opened at the end of the molding cycle.

Abstract: A process is disclosed for producing extremely fine polyamide/polystyrene fibers which include the steps of forming a molten blend consisting of from about 35 weight percent up to about 45 weight percent of a polyamide, preferably polycaprolactam and, correspondingly, from about 65 weight percent down to about 55 weight percent of a polystyrene, forcing this molten blend through an extrusion die to form a structure such as a strand, monofilament, sheet or film, melt drawing the extruded structure at a draw ratio of at least 4:1 to orient the same and thereby obtain a fibrillatable structure, and thereafter mechanically fibrillating the oriented, fibrillatable structure by cold drawing whereby the structure spontaneously and completely breaks up into extremely fine polyamide/polystyrene fibers. The blend may optionally additionally contain up to about 15 weight percent of an ethylene/acrylic acid copolymer containing about 20 weight percent acrylic acid.

Abstract: Button rods are made of different colored resins containing thixotropic agents and having catalyst and promoter agents added to separated portions of each resin so that when the resins are combined their gel time is accelerated. The combined resins are mixed both for mixing purposes and to lower the apparent viscosity, and the resins are fed through nozzles and into an inclined trough. The nozzles are reciprocated in arcs to lay the resins in a zig zag pattern in the trough, and the resins flow from the trough into an inclined casting tube where they quickly attain a relatively high apparent viscosity until they are removed from the tube before completely hard. The rods can then be sliced into button blanks or hardened and ground into beads.

Abstract: Method of making multiple container carrier stock comprising strands of a resilient and deformable plastic material that has been extruded and fused in the molten or semi-molten state.

Abstract: Method for producing a synthetic fiber substantially comprising dissolving a composition consisting essentially of:A. 5-40 percent by weight of a copolymer consisting ofA. 20-80 percent by weight of polyvinyl alcohol, andB. 80-20 percent by weight of acrylonitrile, andB. 60-95 percent by weight of a copolymer consisting ofC. 55-95 percent by weight of styrene, andD. 5-45 percent by weight of acrylonitrile, in dimethyl sulfoxide or dimethyl acetamide as a solvent, and wet-spinningThis fiber is used for producing paper and has a potentially fibrillar texture. When beaten, it forms a synthetic pulp having stalk fibrils and micro fibrils extending from the stalk fibrils.High-tenacity synthetic paper can be made because this synthetic pulp is self-adhesive.

Abstract: Manufacture of rapidly hardening phenol formaldehyde resin molding compositions having improved thermal stability and good flow characteristics by incorporating into the molding compositions hexamethylenetetramine in the form of a metaboric acid addition product. The resulting molding composition is then rolled and ground to produce the molding composition of improved properties.

Abstract: Cigarette filters are made by passing a continuous rod of filter material continuously through a moving die to form a continuous filter element having a repeated pattern of staggered grooves so arranged that the continuous filter element can be cut at regular intervals to form individual filter elements each having in its peripheral surface a number of grooves extending substantially axially alternately from opposite ends of the element.

Abstract: Production of a high-strength, convoluted polyester staple fiber which includes use of a spinneret having a slot aperture having a width of greater than about 0.07 mm, and a length to width ratio of at least 2, spinning at a spin stretch factor of equal to or greater than 100N, where N is the number of elongated slots that make up each outlet orifice, at a spinning speed of greater than about 1500 m/min., drawing the fiber under amorphous retaining conditions by an amount greater than the natural draw ratio, mechanically crimping the fiber, cutting it to staple lengths, and relaxing the fiber 10 to 40%. The fiber is cotton-like. The preferred polyester is polyethylene terephthalate.