Shaping by extrusion

A machine for processing thermoplastic materials and in particular for extruding thermoplastic materials having a casing including two generally opposing surfaces of which the temperature is controlled and which at least in part define an enclosed working chamber, an inlet for introducing material into...     

This application describes a cross-head for directing flowable polymeric materials 90.degree. from the axis of an extruder or similar pressure source and providing substantially uniform pressure patterns at the cross-head output. This is accomplished by dividing and subdividing the stream entering the...     

A method for extruding synthetic resinous materials including introducing a mixture of softened variously or similarly colored or clear resinous chips into an extruder, coating the chips with a coating agent such as a lubricant in the barrel of the extruder, extruding the mixture through an extrusion...     

A photoconductive layer comprising a block copolymer which exhibits a lamellar morphology, said copolymer having lamellae of at least 2 phases, one phase comprising a photoconductive material and the other phase an elastomeric material, with said lamellae being disposed in a direction substantially normal...     

Molten crystallizable polymer is extruded through an orifice. Opposite the orifice on the upstream side is a fixed surface arranged so as to provide in the molten polymer a line of uniaxial extension or a plane of pure shear passing through the orifice. The polymer is extruded at a temperature and flow...     

The present invention relates to an improvement in a die for extruding thermoplastic sheet having a controlled degree of microsurface roughness. The improvement comprises having a beveled leading edge on at least one of the die lips wherein the bevel is away from the die orifice in order to control the...     

Method for cooling and pelletizing thermoplastic material including compacting the plastic material through a plurality of orifices. Air is vented from the compacting device by a conduit, and a pressurized gaseous stream is supplied in the conduit in a direction away from the compacting device. A signal...     

Sheet extrusion of elastomeric material wherein an extruded strand is passed through a die having a symmetrical runner system which divides and subdivides said strand into multiple strands equal in length and cross section, and then gradually transforms the multiple strands into laterally adjoining flattened...     

Scintillation phosphors, infrared and ultraviolet transmitting shaped articles of unrestricted length and arbitrary cross section are formed by multiple extrusion of a relatively small single crystal, melt-grown macrocrystal ingot, or, re-extrusion of a relatively small, fully dense polycrystalline parent...     

Flame-retardant and infusible fibers having a water-swelling degree lower than 2.0, obtained by spinning precondensates of melamine-aldehyde resins and thereafter curing the resulting fibers.

This application discloses a melt extrusion process for preparing articles of manufacture of improved properties from very high molecular weight linear ethylene polymers having an annealed density greater than about 0.94 gms/ml. The ethylene polymer employed in the process has melt flow properties such...     

A method for extruding an object of undefined length capable of plastic deformation into another object of undefined length and smaller section, using the driving forces and the pressure developed in a viscous fluid surrounding the first object by the movement of a mobile member provided with a groove...     

An extrusion pelleting process and apparatus is disclosed wherein the outermost portion of an extrusion orifice is surrounded by a heat reservoir maintained at a temperature significantly higher than the softening temperature range of the polymer being extruded. The high temperature heat reservoir constitutes...     

Profiles may be extruded directly from powdered ABS or other similar thermoplastic materials without pelletizing the feed material, by compounding under dry air flush conditions; maintaining dry air atmosphere conditions on the compounded materials until charged into the extruder; and providing vacuum...     

Poly(ethylene terephthalate) filaments of enhanced dyeability, low boil-off shrinkage (even in as-spun condition), good thermal stability over a large temperature range, and useful as texturing feed yarns and/or as hard yarns requiring no further drawing are prepared by spinning at extremely high speeds,...     

Method for processing solid and viscous plastic material or polymeric material and the like in which plastic or polymeric material is fed through an inlet into an enclosed passage of which opposed side walls are moving simultaneously toward an outlet and the material is processed and dragged forward...     

An extrusion tool consisting of a stack of thin metal wafers in which apertures have been machined by chemical etching. Each wafer has one or several apertures. For simple profiles the wafers are identical. The apertures in adjacent wafers are angularly offset one with respect of the other for helical...     

A continuous, carrierless dyeable polyester fiber and the process for its preparation is set forth. The fiber is produced from a polymer obtained by producing a melt blend system comprising a homogenous blend of (a) not less than 78 percent by weight of poly(ethylene terephthalate) copolymerized with...     

The actual temperature of the extrudate issuing from a long land die extruder is measured and a measurement signal representative thereof is established. The measurement signal is then compared with a setpoint signal representing the desired extrudate temperature to produce a control signal which is...     

An apparatus for continuously extruding pliant material into thin sheets. Rather than following the standard approach of using cooperating rollers to extrude the material, in the apparatus of the present invention, the material is extruded through the cooperative interaction of a multi-sided rotor mechanism...     

Polysulfide rubber formulations that become fluid at elevated temperatures but regain the rubbery state upon cooling are disclosed. The products possess a lower permanent set at room temperature and process more easily, particularly in extrusion processes, at elevated temperatures.

Remoldable panels are produced by continuously plastifying and extruding an at least partially aggregated particulate mixture comprising about 40 to about 60% by weight of thermoplastic resin, preferably polypropylene, and about 60 to about 40% by weight of a particulate organic and preferably cellulosic...     

The rate of extrusion of an elongated article from a dynamic extruder is measured and a measurement signal representative thereof is established. The measurement signal is then compared with a setpoint signal representing the desired extrusion rate to produce a control signal which is responsive to the...     

Acrylonitrile polymers containing at least 91% by weight acrylonitrile are spun from solutions having a polymer concentration of 38 to 75% by weight. Useful polymers have an intrinsic viscosity of 0.6 to 2.0, most preferably 0.9 to 1.1, 7 to 23 .mu.eq./g. enolizable groups after mild acid treatment,...     

A spinneret assembly is disclosed that comprises thin individual spinnerets simultaneously exhibiting a great mechanical resistance to pressure and a great number of orifices, in which: the relation between the total piercing area and the total surface of the assembly is between 35% and 90%; the relation...     

A T-shaped extrusion die for forming transparent, uniformly thick and edge beads-free synthetic resins with a high efficiency, comprising a die body having a manifold for containing a supply of the synthetic resin in molten state and a slot-like passage for the molten resin, adjustable lips for forming...     

A roller die apparatus includes a pair of cylinder rolls which are rotatably and obliquely yieldably mounted on a frame disposed on the output end of a plastic extruding machine. The rolls are biasedly restrained in the frame to permit the obtusely directed movement thereof with respect to the direction...     

An improved replaceable filtration unit for high viscosity fluids, of the self sealing semi-disposable type and having inert granular material supported by a screen within a housing, wherein the improvement comprises having the screen's rim swaged into the housing, preferably with an interference fit...     

A molding composition is comprised of (A) polypropylene, (B) glass fibers and (C) an imido/NVP, or imido/NVP/polyester prepolymer, and is useful for the fabrication of a variety of shaped articles, especially for the automotive industry [e.g., radiators, battery casings, fans, etc.].

A spinerette assembly wherein tapered passageways and distribution chambers of diminishing length are so arranged as to provide equal back pressure over all orifices thereby providing extrudates of improved uniformity of diameter after stretching.

Method and apparatus for forming filaments are provided by centrifugally forming a veil of primary fibers or streams of material and moving a fluid along a path within the veil at a velocity sufficient to attenuate said primary fibers into filaments.

A flexible lip die blade is provided in which local flexing of the blade is brought about by activation of heaters located in connector members connecting the flexible lip with the body of the die blade.

An improved coat hanger die is provided wherein the manifold is curved and wherein the manifold radius, coat hanger slit part thickness and the form of the coat hanger die are determined by a formula which is disclosed all in relation to the radius of the manifold at its inlet. The radius of the manifold...     

An extruder with a roller die in which a plastic or rubber material fed from a mixer is formed into a sheet by a roller die located at the fore end of a screw feeder which includes a cylinder and a revolving screw, the screw feeder employing a short screw shaft which has its base portion rotatably supported...     

A plastic extrusion apparatus is provided which includes a gear pump for accurately metering the plastic through a die. The apparatus is adapted to process highly viscous plastic material under high temperature and pressure conditions, and the gear pump includes a non-leaking and substantially frictionless...     

What is disclosed is an adjustable wide-slit extrusion nozzle containing a distributor channel having a straight exit edge and a cross-section taken from the supply port for the nozzle to one end thereof which corresponds to the equation: R.sub.i =R.sub.o (b/B).sup.1/3, wherein: B is the width of the...     

A spinneret plate having capillaries of different length, and preferably capillaries of different cross-sectional shape. The spinning plate has a boss through which some of the capillaries pass.

Novel, improved rotary processors which include a rotatable element carrying a plurality of annular channels and a stationary element providing a coaxial, closure surface operationally arranged with the channels to provide enclosed processing passages. The so-formed plurality of processing passages provide...     

An extruder nozzle for producing a relatively wide flat ribbon of extruded fluid is provided. The extruder nozzle includes a groove in communication with the orifice of the nozzle, the groove being generally arcuate in shape and so dimensioned that the ends of the arc are closer to the extrusion point...     

The coextrusion device (20) of the present invention can be used with conventional extruders (24-26) and extrusion dies (90) for forming layered products (91) from at least two materials. It includes a manifold (21) for receiving a plurality of extruded feed materials (A, B, C) and a feedblock (22) receiving...     

A novel, improved rotary processor comprising a rotatable element carrying a plurality of processing channels and a stationary element having a coaxial closure surface operationally arranged with the channels to provide a plurality of enclosed processing passages. The plurality of passages provide interconnected...     

A process for removing poly(arylene sulfide) deposits on fiber spinning equipment parts is provided which comprises extruding a molten olefin polymer through the particular part. In the process of extrusion, the deposits are removed.

Disclosed is a process for extruding thermoplastic resinous compositions, comprising the steps of heat plastifying the resinous composition in an extruder; cooling the heat plastified resinous composition exiting from the extruder to a uniform temperature desired for extrusion through an extrusion die,...     

A foam extrusion apparatus and method in which extrudate is extruded into a sealed chamber which may be subjected to pressure variation such as a vacuum with the controlled shaping of the plastic being obtained by power driven rolls within the chamber downstream of the die. Because of the harsh environmental...     

Making polymeric extrudates having a smooth surface by feeding a molten polymeric core material through a die cavity wherein a portion of the wall of the die cavity is a rigid microporous structure located upstream from a narrowed flow passage of the die cavity, the microporous structure having a substantially...     

A spinneret assembly which includes a filter bed holder containing a filter element. The filter element increases in porosity from its center to its periphery.

A rotary extruder contains pump rings positioned at opposite ends of the rotor shaft to collect excess thermoplastic melt forced outwardly to the housing ends and to redirect this excess melt to the feed section of the extruder. Redirection of the melt is accomplished by helical grooves located on the...     

A die, associated with an extruder and provided with an inwrought flow channel with displacement cores for shaping a plasticized synthetic resin bulk stream into a profile cross-section with hollow chambers, has a die housing that is composed of several die members with vertical and/or horizontal mold...     

A stretch wrap film having one sided cling comprising a thermoplastic A/B film structure wherein layer A in stretched condition has a comparatively high cling force to layer B and layer B has at least substantially no cling force to a layer of itself.

A method and apparatus for forming fibers includes a spinner having a porous member positioned therein in a region normally covered by molten glass, and means for supplying a gas to the porous member under pressure sufficient to cause introduction of the gas into the molten mineral material.

A process and apparatus for producing a fibrous assembly. At least one fiber-forming polymer is extruded through a spinneret having numerous small openings. The process uses a die equipped with a spinneret having numerous closely spaced small openings and an opening ratio (.alpha.) of at least 30%. At...     

A method for producing a crosslinked, uniformly expanded article of thermoplastic resin is provided. Thermoplastic resin containing a crosslinking agent and a foaming agent is extruded through a long-land die which is provided with a choking orifice at an end and/or an intermediate portion thereof; a...     

An apparatus for handling and processing very different types of material, for example by means of homogenizing, predosing, plasticizing, or mixing. Accommodated in a working chamber of the apparatus is a rotatably driven processing tool which supplies the material, during the processing, to an outlet...     

The disclosure relates to a ram extruder including an extruder barrel having an extrusion die at one end and a hydraulic ram at the other end having a piston which is advanced along the barrel by the ram to displace material in the barrel through the extrusion die. To facilitate loading of the barrel...     

The invention pertains to a system for dispensing tacky thermoplastic material such as butyl, and the like, and includes encasing a strip of the tacky material within a thin, non-tacky thermoplastic film capable of fluxing into the material at elevated temperatures wherein the material may be wound upon...     

A die for a thermoplastic material with at least one output-gap-defining adjustable die lip, an opposing gap-bounding lip, at least one adjusting element working on the output-gap-defining die lip as well as a control and adjusting device for the thickness of the extruded plastic product, wherein the...     

A high modulus polyester comprising the following structural units (I) anr (II) and (III), the structural units (I) and (II) occupying 51-99 mol % of the whole and the structural unit (III) occupying 49-1 mol % of the whole, and a high modulus shaped article obtained from the polyester: ##STR1## wherein...     

A multilayer film food wrap having outer layers of a polyolefin resin including a cling agent, and a core layer of a resin having a high melting point, resistance to heat, low permeability to oxygen, moisture and odor, and film toughness. Methods of preparing the film and fabricating the film into a...     

An oriented film structure comprising a polypropylene film having on at least one surface thereof a layer of a blend of (I) a linear low density copolymer of ethylene with a minor proportion of a C.sub.3 -C.sub.10 alpha olefin and (II) polypropylene.

Disclosed herein are thermoplastic resin sheets having a thermal shrinkage within .+-.0.3%, and a process for producing thermoplastic resin sheets by co-extruding a first thermoplastic resin and a second thermoplastic resin which is nonadhesive to the first thermoplastic resin, into a sheet-like structure...     

An ionomer resin, a film or sheet of the ionomer resin and laminated articles having a lamina of the ionomer resin film are provided. The ionomer resin consists of ionically crosslinked ethylene-methacrylic acid copolymer or ethylene-acrylic acid copolymer which is neutralized with a polyamine, preferably...     

The invention provides an extruded caulk strip comprising a shaped caulk body in melt fusion contact with one major surface of a protective strip formed of substantially amorphous, non-tacky, conformable, thermoplastic, film-forming polymeric material. The extruded caulk strip is formed by melt extruding...     

A blend of low density polyethylene and crystalline polypropylene can be melt spun at high temperature and high speed to produce a fiber. The fiber has utility as a binder fiber in nonwoven fabrics. The blend contains 5 to 35% by weight polypropylene and 95 to 65% of polyethylene.

A blend of low density polyethylene and crystalline polypropylene can be melt spun at high temperature and high speed to produce a fiber. The fiber has utility as a binder fiber in nonwoven fabrics. The blend contains 5 to 35% by weight polypropylene and 95 to 65% of polyethylene.

Compound film containing polyolefin. Such a compound film comprises at least one polyolefin layer having good adhesiveness to polymers containing polar radicals. In order to make the adhesive polyolefin layer such that the adhesive layer contains no substances detrimental to health, the adhesive layer...     

A coextrusion multi-layer tubular film comprising: an outer layer comprises a linear ethylene .alpha.-olefin copolymer having a density of from 0.900 to 0.945 gram per cubic centimeter; and an inner layer made of (i) a polypropylene-based resin or (ii) a resin composition comprising from 60 to 98% by...     

A melt spinning apparatus is disclosed which is adapted for dividing a molten polymer into a plurality of streams to form synthetic filaments. The apparatus comprises a spin block assembly having two opposite sides, and two separate heating chambers disposed adjacent respective ones of the sides of the...     

A multilayer thermoformable packaging material is provided and includes one layer of barrier material containing a resin having low gas and vapor transmission properties. The multilayer structure also includes one layer which utilizes scrap produced from the multilayer structure. Other optional layers...     

A melt-spinning apparatus usable for producing various synthetic fibers in various manners, including a polymer melter; a heat-insulating housing having a detachable ceiling cover and a bottom having an opening; a detachable beam block having a cavity formed between a pair of longitudinal side walls,...     

A heat shrinkable and heat sealable laminated packaging material comprising a heat shrinkable film which is endowed with a heat shrinkability by biaxial stretching in advance of lamination, such as biaxially stretched polyamide film or biaxially stretched polypropylene film, and a heat shrinkable polyolefin...     

Extruded polyvinyl butyral (PVB) sheet roughness is controlled by use of PVB resin lightly cross-linked through stable intermolecular linkages.

Novel multi-layer laminate articles of improved adhesion strength comprising at least two layers including a polyester resin layer and a layer of an epoxy group-containing olefin polymer or an olefin polymer composition comprising the epoxy group-containing polymer, are described. The epoxy group-containing...     

A synthetic resin worm press in which the thread height in an intake zone adjoining a feed opening zone is substantially smaller than the thread height in the feed opening zone, a frustoconical divergent transition piece is provided between the two zones at the core of the worm and longitudinal grooves...     

Printable high strength, thin stretch wrap composite films exhibiting excellent self-adherence without heat sealing are comprised of at least two layers, wherein one outside layer is comprised of a tackified ethylene-vinyl acetate copolymer and the other outside layer of a very low density polyethylene...     

A coating method wherein a part of coating liquid supplied from a liquid supplying device is circulated through a closed passage running somewhere between the liquid supply device and a liquid delivery nozzle of a liquid applying section from the liquid applying section to the liquid supply device while...     

A silicone crumb in a fine particulate form has an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals. This crumb is made from a vinyl-containing polyorganosiloxane, a silicon-bonded...     

A method of processing hydrocolloid adhesive material includes the steps of extruding a sheet of the hydrocolloid adhesive material from a vacuum extruder, applying a liner of release material to at least one side of the sheet, under pressure, and while the sheet is at an elevated temperature and maintaining...     

A heat-shrinkable, composite packaging film comprising (a) a core layer of saponified ethylene-vinyl acetate copolymer; (b) a first polymeric outer wall bonded to one side of the core layer; and (c) a second, heat-sealable polymeric outer wall bonded to the other side of the core layer; said first and...     

A coated, oriented polymer film laminate is provided which comprises: (a) an oriented core layer having an upper face and a lower face, said core layer being fabricated from a polypropylene homopolymer; (b) an oriented, heat sealable layer applied to the lower face, and optionally, to the upper face,...     

A melt spinning apparatus is disclosed which comprises a stationary melt supply assembly which includes a spin block, and a nozzle assembly releasably connected to the spin block. The means for releasably connecting the nozzle assembly to the spin block includes a cylindrical connecting plug fixed to...     

A melt spinning apparatus is disclosed which comprises an elongate heating chamber having a generally U-shaped outline in cross section and so as to define two parallel leg sections of hollow, double wall construction, and an intermediate leg section extending between the two parallel leg sections which...     

The present invention relates to a film for use in stretch-packaging that comprises an intermediate layer which contains as its main component an .alpha.-olefin-series resin component containing a butene-1-series resin and at least two surface layers each containing an ethylene-vinyl acetate copolymer...     

Disclosed is an adhesive tape based on a co-extruded, three-layer polypropylene base film which has been biaxially stretch-oriented in at least three stages and has been subjected on at least one side to corona treatment. The base film comprises a base layer and two covering layers. The base layer comprises...     

A photographic paper support material for photographic purposes is disclosed with a polyolefin coating on both sides, wherein the base paper is internally sized by using a hydrophobizing sizing agent, and is surface sized with an aqueous coating mixture. The aqueous coating mixture contains a carboxyl-modified...     

A resilient pad for keyboards, such as computer keyboards, is disclosed. The pad is composed of EPDM blended with a copolymer of propylene oxide and allyl glycidyl ether. Each of the polymers is present in the amount of 10-90 parts. An accelerator system for the polymer blend is also disclosed. The pad...     

A product and method for obtaining a radiation-resistant polyolefin-containing product, by handling and processing the corresponding homopolymer or copolymer melt and resulting extrudate in a manner favoring retention of a high smectic and less than about 20 wt % monoclinic configuration.

A multilayer film useful in the packaging of high acid food products at elevated temperatures comprises a core layer of ethylene vinyl alcohol copolymer, two intermediate layers each comprising a polyamide; outer blend layers of linear low density polyethylene and anti-blocking agent, and adhesive polymeric...     

A process is described for reducing the volume of spent ion exchange resins containing radioactive contaminants, and a filter aid having groups reactive with the functional groups of the resins. Spent ion exchange resin and the filter aid are dewatered, then subject to a pressure of about 2000 psi in...     

An oriented, heat-sealable polypropylene film is provided which possesses a low coefficient of friction, excellent anti-static behavior and good optical clarity.

The present invention relates to a highly sensitive heat-sensitive film for stencil. This invention provides a highly heat-sensitive film for stencil, comprising a thermoplastic resin having a coefficient of temperature and melt viscosity (.DELTA.T/.DELTA. log VI) of not more than 100 and a thermal shrinkage...     

A carbonizable body is formed by infusing a plurality of preoxidized, preferably stabilized by known processing to have about 9 to 14 weight percent oxygen, polyacrylonitrile fibers in a polar liquid plasticizer, preferably water, capable of extracting a tarry leachate from the fibers. The infusion of...     

A biaxially oriented transfer metallizing film based on polypropylene, and process therefor. The film is a three-layer film produced by coextrusion and having a base layer of a propylene homopolymer and top layers applied to the two surfaces thereof. The base layer contains an additive depot of migrating...     

A composite film suitable for shrink-packaging bony cut meat, including at least one oxygen-impermeable layer, and at least one heat sealable, surface layer formed of a thermoplastic resin, said film having the following physical properties: C.sub.L .gtoreq.15 C.sub.T .gtoreq.15 80.ltoreq.S.sub.L .ltoreq.250...     

In a heat displacing type die adapted to extrude a sheet of molten resin, a heat displacing unit provided with a heater is secured to an upper die block. A lip gap is defined between a flexible lid and a stationary lip respectively provided for the upper and lower die blocks. The lower end of a bolt...     

An antistatic article comprises a thermoplastics polymeric substrate having at least one surface layer comprising (a) a polychlohydrin ether of an ethoxylated hydroxyamine and (b) a polyglycol diamine, the total alkali metal content of components (a) and (b) not exceeding 0.5% of the combined weight...     

A polypropylene multi-layer film which comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin composition comprising: (A) 10-90% by weight of a propylene random copolymer satisfying that (i) the comonomer content is 4-15% by weight, (ii)...     

An optical information record medium is disclosed in which an optical information record layer is formed on a substrate made of a polycarbonate resin. The polycarbonate resin is purified to remove the residual chlorine in the resin enough to form the substrate containing no more than 1.0 ppm of chlorine...     

A melt spinning apparatus is disclosed wherein the spinning head is inserted in an upward manner from beneath into the lower end of a vertically extending opening in a heater box. Upwardly directed air currents are avoided in the vertically extending opening by providing a metallic contact, in the form...     

An active agent-containing laminated material and the method for producing the same, in which an impermeable film is temporarily adhered to at least one side surface of an active agent-containing film and impermeable film can be peeled off and readhered repeatedly. The laminated material is prepared...     

A shrinkable film for packaging excellent in the heat-sealing property and the shrinking property is disclosed. This shrinkable film is obtained by stretching a film of a mixture comprising 100 to 30 weight parts of a crystalline polyester (A), which comprises mainly terephthalic acid and 1,4-cyclohexane...