Abstract: A die and a process are provided for extruding thermoplastic film with a controlled bead thickness. The die includes inserts at the ends of the die to alter flow of molten thermoplastic material.

Abstract: A viscous flow thermoplastic film is extruded as a variant thickness profile curtain by means of an extrusion die having a flow choke rod extending longitudinally parallel with the die jaws and positioned within one die jaw for chordal projection into the die flow channel. The choke rod is surface relieved by chordal flats at locations corresponding to film zones of greater thickness. A single rod may be provided with as many profile pattern sequences as space and dimension allows chordal segments around the rod circumference. Pattern selection may be changed under die running conditions by rotating the profile rod about its axis to align the flats of the desired pattern within the die flow channel.

Abstract: 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.

Abstract: A coating device for the coating of synthetic resin in a given thickness on the outer surface of a core body. An elongate body made of metallic tube or the like passes through an extrusion chamber and out of an opening in the chamber. A moveable die is held, rotatable freely, between said chamber and a fixed die provided in alignment with the opening of said chamber. The fixed and moveable dies are provided respectively with an optional number of grooves in the forward direction of the elongate body on their inner walls, with respective grooves being alignable with each other. By giving a fixed rotation to the moveable die, the supply and non-supply of synthetic resin to the grooves of the fixed die will repeat. Thus, the surface of the body is coated with synthetic resin and, at the same time, there are formed on the surface of the coated resin a plurality of projections in a discontinuous form.

Abstract: A mold has a core surrounded by an outer sleeve which defines with the core an annular axially extending passage. An adjustment element in the form of a ring or sleeve is displaceable in this passage so as to vary the radial dimension of a tubular blank that is extruded from the outlet end of the passage. The adjustment ring or sleeve may be elastically deformable by means of hydraulic cylinders or screws so as to create the desired thickness at the desired location, and may even be displaced during operation of the apparatus so as to vary the thickness of the blank from one region to another in the direction in which it is extruded.

Abstract: A method for reducing the melt fracture during extrusion of a molten narrow molecular weight distribution ethylene polymer which comprises extruding said polymer through a die having a die gap greater than about 50 mils and wherein at least a portion of one surface of the die lip and/or die land in contact with the molten polymer is at an angle of divergence or convergence relative to the axis of flow of the molten polymer through the die.

Abstract: A method and mechanism for continuously making film with one or more fastener profiles thereon to be used for making reclosable plastic bags. The film is extruded through a T-shaped head having a thin slot die opening, and at least one fastener profile is extruded through a preform die block positioned so that the film and profile will engage and fuse to each other while the plastic is still in the state of fusion. The die block is mounted adjustably to be moved into different positions along the film head with the positions varying across the film width to control the location of the profile relative to the edges of the film or relative to other profiles on the film, with the width of the film also being controllable.

Abstract: An apparatus for producing a corrugated foamed plastic sheet includes an extruder and a die provided at the extrusion end of the extruder. The die has a plurality of grooves provided on one of its surfaces which make contact with the foamed sheet being produced. The grooves extending from the resin feed inlet toward the resin exit of the die.

Abstract: 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 slot-like discharge orifice, inner deckles useful mainly for varying the edge thickness of the resulting extruded film, support rods for supporting the inner deckles, and inner deckle rods for regulating the width of the resulting extruded film, the inner deckles being moved by moving the support rods in the manifold in sliding contact with the surface thereof to vary the edge thickness of the resulting film, the inner deckle and inner deckle rod being kept somewhat away from each other thereby to permit free movement of the latter even under a high molten resin pressure. In one embodiment, a remover for an oxidized or scorched resin is disclosed.

Abstract: A bland texturized monofilament protein product having a texture and mouth feel simulating animal meat is prepared by forming an aqueous slurry of a protein material, injecting high pressure steam into the slurry to propel it through a confined treatment zone, centrifugally spinning the protein material into monofilaments, and recovering the textured monofilaments in a collection zone. Apparatus for performing this process comprises means for injecting steam into a protein slurry, means defining a confined treatment zone wherein the injected steam and protein are contacted, and means for centrifugally spinning the steam-treated protein material into monofilaments.

Abstract: The method and apparatus are useful in forming a parison which has a varying wall thickness and an outer diameter larger than the outer diameter of the annular outlet orifice from which the parison is extruded. Such a parison is obtained by adding additional molten thermoplastic material to the parison while extruding the same to vary the thickness of portions of the parison. The additional molten material is directed radially outwardly from the axis of the parison to increase the wall thickness and to increase the swell of the parison which is defined as the ratio of the inner diameter of the parison to the outer diameter of the outlet orifice. Also the ratio of the outer diameter of the parison to the inner diameter of a mold in which the parison is blowmolded into a container is reduced permitting a larger container to be formed from the thicker portion of the parison while having a small entrance opening formed from a thin wall portion of the parison.

Abstract: A control circuit is adapted to control the movement of a pintle relative to the die head of extrusion apparatus. A command signal is supplied to a signal generator, which produces a first output signal in the form of a series of continuous voltage triangles, and a second output signal in the form of unit pulses. An impedance matrix contains a plurality of potentiometers which may be remotely connected to a summing amplifier. The potentiometers are arranged in a numerical order. Odd-numbered potentiometers are supplied with the triangular output signal from the signal generator. Even-numbered potentiometers are supplied with the signal generator triangular output signal, but which has been phase-shifted by half the width of one triangle. The pulse output from the signal generator is supplied to a decoder, which successively connects pairs of numerically-adjacent potentiometers with the summing amplifier during overlapping time intervals.

Abstract: A readily adjustable tubing extrusion die has a laterally movable die ring which is clamped to the die body and slideable by means of positive positioning devices.

Abstract: A foam extrusion apparatus and method employs tandem extruders mounted on horizontal rails for movement toward and away from the end of a vacuum chamber which is in the form of an elongated inclined barometric leg. The upper end of the chamber is closed by a substantial bulkhead also supported on rails and held in inclined position to close the end of the chamber when moved thereagainst. A die is positioned on the inside of the bulkhead and aligned with the leg when closed. The extruders are connected to the die through a length of pipe supported through the bulkhead by a stainless steel bellows. The pipe externally of the bulkhead is provided with a circulating jacket for temperature control. The die is adjustable externally of the bulkhead. The extruders, die and bulkhead are movable as a unit or separately toward and away from the chamber to provide access to the die and the interior of the chamber.

Abstract: A steel-pipe coating process and an apparatus therefor, in which molten resin is extruded through a cross-head die connected to an extruder, into a tubular shape, in a manner to cover or coat the surface of a steel pipe. In this apparatus, a resin outlet in the extruder is communicated through the medium of a resin guide member with a resin inlet of the cross head die. The extruder is secured to a fixed frame, while the cross head die is supported by the fixed frame in a reciprocating manner through the medium of a reciprocating drive member within a given stroke in the direction of the steel pipe being fed. Thus, when the cross head die is reciprocated by means of the reciprocating drive member, the relative speed of the steel pipe being fed to the cross head die being reciprocated may be intermittently varied, whereby the amount of resin being extruded through a cylindrical outlet of the cross head die around the surface of the steel pipe may be intermittently varied.

Abstract: A retreading envelope is made by extruding a split tube of rubber which is passed over a rotating stretching wheel to stretch the split tube to a predetermined shape. The stretched split tube is removed from the stretching wheel after moving around a part of the circumference thereof and is turned inside out and placed on a table whereat it is formed and cut into an annular shape preparatory to completion of the retreading envelope.

Abstract: An improved method and apparatus is described for varying the profile as seen in cross section of an elongated extrudate article. The method and apparatus provides for varying the profile of an extrusion orifice while an extrudate stock material is being forced through the orifice. An elongated extruded article is formed having a varying profile conforming to the variations in the profile of the extrusion orifice.

Abstract: A spiral insulation rib between the inner and outer conductors of a coaxial cable is provided having a rectangular cross section by pointing the extrusion slit approximately in the direction of the spiral winding and by providing side surfaces of the extrusion slit which are concave so that the width of the slit is smallest at the center thereof and gradually increased toward either end.

Abstract: In an optical fibre cable having a core of one or more straight optical fibre waveguides, with or without a textile sleeve, the protective sheat surrounding the core consists of a plastic tube incorporating reinforcing tensile material in its wall, the relative proximity of the fibres, the sleeve if present, and the sheath being such as to permit freedom of movement of the fibres in relation to the sheath, in both radial and axial directions. The preferred form of reinforcement consists of elongate tensile members, such as steel wires, embedded in the sheath wall, equally spaced apart and lying parallel to the core. The reinforced sheath is formed by a single continuous extrusion step, the reinforcing members being fed into the extruded plastic material simultaneously with the feeding of the cable core into the bore of the extruded sheath.

Abstract: A cross-head die in which the manifold is provided with means for selectively varying the volume of the manifold at some locations relative to other locations, whereby the relative wall thickness about the annular configuration of the material flowing through the die is selectively adjusted about the periphery of the annular configuration of flowing material. Wall thickness and configuration are further controlled at the outlet orifice of the die by means movable to selectively expand, contract and alter the annular configuration of the die passage at the orifice.

Abstract: A plastic tube is provided which has a main lumen, an auxiliary lumen, and an integral connector at one end for connecting the main lumen in fluid communication with another device. The auxiliary lumen extends longitudinally within the side wall of the tube with the integral tube connector free of the auxiliary lumen. The tube can be made by extruding thermoplastic material through a die having a hollow main lumen die pin and a hollow auxiliary lumen die pin adjacent the die outlet orifice. Air under pressure is supplied to both die pins to produce tubing extrudate having main and auxiliary lumens. The pressure of the air supplied to the auxiliary lumen forming pin is reduced at programmed intervals during the extrusion of the tubing so that selected portions are free of an auxiliary lumen or have a lumen of limited size. The tubing can be severed so that it has a selected portion at one end that can serve as an end connector.

Abstract: An apparatus for the extrusion of tubular bodies of synthetic-resin material and especially large-diameter pipes, in which the die for forming the tube is connected to an extrusion press and includes an outer member and an inner member between which the material is forced. On the outer member there is provided a calibrating sleeve and the die carries a radioactive thickness-measuring means.

Abstract: Apparatus for adjusting the rotary position of any selected one of a plurality of rotatable die bolts to control the position of a die lip and the size of a die opening adjacent the die lip comprising a reciprocable drive member movable in a to-and-fro path of travel and a plurality of bolt actuating members mounted on the drive member for movement therewith and for movement relative thereto between positions removed from the bolts and bolt drive positions in driving relation with any selected one of the bolts.

Abstract: A log forming apparatus includes a slotted die chamber, a rotary feed auger for advancing loose particles into the die chamber, and a replaceable tip having a pressure face for engaging successive layers of particles from the auger and pressing these layers together into the shape of a log. The pressure face comprises a plurality of semi-circular grooves for forming ridges in each layer of particles which are pressed within corresponding grooves of a preceding layer during compaction. A mandrel extends axially forwardly of the pressure face and forms an axial bore through the log to facilitate the removal of heat and steam therefrom. The mandrel is hollow to direct a flow of compressed air through the bore to further facilitate such removal. The auger comprises an interrupted helical screw thread for providing a sensitive advancement of loose particles forwardly along a helical feed channel defined by the screw thread. The feed channel includes a forward discharge scoop of substantially constant volume.

Abstract: An apparatus for extruding plastic tubes, which may be substantially rigid, semi-flexible, or flexible, as desired. A spiral or helical tape or filament is extruded, simultaneously with a plastic tube, whereby the resulting final product comprises a reinforcing helical skeleton, and an integral tube covering. The spiral or helical tape or filament is rotated as it is extruded, whereby the filament may be close together or relatively spacially separated, during extrusion, as for example, in the manufacture of a flexible hose. The diameter of the finished product can be readily varied, by simply adjusting the size of the extrusion collar. The reinforced tube manufactured according to the process and with the apparatus is strong, smooth, and relatively inexpensive.

Abstract: A multiple-cavity extrusion die for coextruding a plurality of indefinite lengths of multiple-layer tubular rubbery material. Core mandrels which extend into openings in the face of the die are adjustable for concentricity with respect to the die by internal or special external adjusting means. Cylindrically shaped core dies have frustro conically shaped forward portions which form extrusion dies with the cores for the core layer of rubbery material and form extrusion dies with a beveled back edge of an adjustable cylindrical cover die. Each of the cover dies is axially adjustable with respect to a respective core die to adjust the speed at which the individual tubes are extruded so that the speed of all tubes can be equalized. Special concentricity plates on the face of the covered dies are adjustably mounted with respect thereto so as to adjust the die openings for concentricity of the cover layer of rubbery material of each tube.

Abstract: This invention relates to an improvement in the construction of retreading envelopes and to an extrusion apparatus for producing same.The envelopes commonly used in bonding new treads to tire casings are generally uniform in thickness, and, as a result, no provision is made for those areas of the envelope which receive the greatest stress.By utilizing an envelope of U-shaped cross section and one whose thickness is significantly increased in areas of greatest stress, the prior art impediments are effectively overcome.

Abstract: An extrusion device, comprises an extruder housing, having a cylindrical interior wall and a cylindrical rotor rotatable in the wall at spaced relationship from the interior wall of the housing, so as to define an extrusion passage therebetween which connects at one end to an inlet, and at an opposite end to an outlet, which has an extrusion control device located to close a portion of the extrusion passage. The construction also includes at least one second extrusion control device located in the passage between the outlet and the inlet, which is regulated to close at least a portion of the extrusion passage before the extruded material moves through the outlet.

Abstract: An extrusion head and a method for controlling the concentricity of extruded tubular products. A die member has a generally spool shaped configuration with front and rear flanges connected by a hub. The die member has a bore extending completely through it in the hub area. A mandrel is inserted and held in the bore to define an annular space. The rear flange is rigidly connected to a source of molten material to be extruded. The material is introduced into the annular space and issues from the die as a tubular product. Connected to the front flange is a means for deflecting the front flange and the connecting means for deflecting the front flange and the connecting hub relative to the mandrel in order to correct out of concentric formation of the tubular article.

Abstract: Apparatus for producing a curled food product by extruding gelatinous cereal grain meal includes a mechanism for adjusting the extrusion space between two complimentary frustroconically shaped die surfaces of die extrusion members. One die member is maintained in an axially or longitudinally stationary position while the other die member is moved axially or longitudinally with respect to the stationary member. As a result, the space between the complimentary die surfaces may be adjusted to control the cereal grain extrusion process. Adjusting the extrusion die includes longitudinally adjusting a second frustroconically shaped die surface in face-to-face relation with a first complimentary and frustroconicaly shaped die surface in order to adjust the separation space therebetween.

Abstract: This is an extrusion head for extruding a parison to be blow molded. A shooting mandrel is longitudinally movable within a plastic melt accumulator chamber. After a "shot", the shooting mandrel is in the up position. The plastic melt fed to the plastic accumulating chamber forces the shooting mandrel to the down position as the plastic accumulating chamber is filled. The parison is formed by moving the shooting mandrel upwardly to the up position. The plastic flows around the shooting mandrel as it flows from the accumulating chamber and out of the extrusion head.

Abstract: Process and apparatus for extruding synthetic resinous thermoplastic materials, wherein a heat plastified stream of such material is divided into a primary or core stream, and non-primary or secondary stream(s), the secondary stream(s) heated to a temperature substantially hotter than the core stream, and the hot secondary stream(s) thereafter layered onto the opposite surfaces of the core stream prior to expelling the material from an extrusion die. Such a process and apparatus is practiced to avoid a loss of surface smoothness in the extruded product.

Abstract: This invention is directed to a bi-metallic die construction in which one of the die components includes a plastic flow channel formed essentially entirely in a face layer of metal which has been deposited by submerged arc welding techniques upon a base block of a metal having dissimilar characteristics therefrom. Generally the face layer metal is a hard, abrasion resistant and difficult to machine and accordingly relatively expensive metal such as stainless steel while the base component metal is formed of a more easily machineable less expensive metal such as hot rolled steel. The resultant die structure combines the benefits of lowered cost and heightened flexibility in the selection of various face materials for specific die use purposes.

Abstract: An apparatus and method are provided for forming tubing of plastic which is forced through a die over a mandrel wherein the inside surface of the tubing is relatively smooth in configuration and the exterior surface thereof is formed with one or more helical ribs or teeth protruding outwardly therefrom which serve to enhance the rigidity of the tube wall and, when the plastic itself is relatively rigid, to render the tube wall more flexible so that it may be deformed or bent without collapsing. In one form, the extrusion die through which the extrusion material is forced to form the tube, is configured to provide the helical formations in the outer stratum of the tube wall and is power rotated as the extrudate is forced through the die to form the helical formation therein. In another form, a portion of the extrusion die is power rotated to form the helical formation.

Abstract: A multilayer parison extrusion molding machine for blow molding which is characterized in that a main extruder and one or more sub-extruders are radially attached to special diehead and said die head comprises a core holder having a core pin at the lower end; a cylindrical mandrel enclosing said core holder; a plurality of sleeves surrounding said mandrel; housings surrounding said sleeves respectively; one or more pressure rings controlling the space in molten resin passages; pressure ring adjusting screws; an extrusion die; and a die adjusting screw.

Abstract: In producing a composite yarn which includes a carrier strand and a layer of tacky polymer, provision is made for adjusting the position of a tube through which the carrier strand passes in relation to a polymer extrusion orifice to vary the annular thickness of the polymer layer.

Abstract: An extrusion head for the manufacture of a hollow string of thermoplastic material whereby the resulting product consists of two concentric layers of the material whose weld seams are staggered in relation to one another, and whose union is accomplished without the two materials being formed into separate tubular layers. Provisions are made to maintain the layers' ratio of wall thickness.

Abstract: Adjustment mechanism for a lip of a die, comprising a row of rods that are fitted to said lip and springs that pull said rods in one direction, and rotatable adjustment shafts that have at their ends an eccentric shaft portion for engaging the free extremities of said rods thereby to displace said rods in a direction opposite to the direction of biasing by the springs.

Abstract: An extrusion die having a linearly movable mandrel that controls the thickness of the extrudate as it emanates from the die head. A piston within the die head is made part of the mandrel to control the position of the mandrel's edge relative to the die's outlet opening, with sensing means in the die assembly and being operative to provide a signal indicative of the relative position of such mandrel to the die head.

Abstract: A film extrusion apparatus or nozzle which includes a pair of oppositely disposed, spaced elongated blades which together define an extrusion orifice of generally uniform width. At least one of such blades is slotted to impart limited flexibility to an exposed terminal corner portion thereof which assists in defining an end of the extrusion orifice. Means are provided for selectively deflecting the exposed, flexible corner portion of the one blade to thereby vary the width of the extrusion orifice along the end thereof.

Abstract: Improved extrusion apparatus is shown for the preparation of a rod-like body from a coal-containing particulate mixture. Control means are disclosed for manually or automatically infinitely adjusting the length, within a preselected range, of the consolidating coal-containing mixture in contact with the surface of the die in response to selected parameters. In the preferred embodiment the operative length of the die may be varied by the control means.

Abstract: An extrusion die for forming hollow bodies has a flow-adjusting ring which also defines the outer periphery of the flow gap for the outer portion of the body.

Abstract: A servo-controller, where, in order to enable a second mobile member to carry out a certain programmed sequence of operations corresponding to the moving position, speed, pressure, force or torque of a first mobile member, the said moving position speed, pressure, force or torque of the first mobile member is detected as an analog signal, which is compared with each of various level signals sorted stepwise and identified so as to operate the corresponding relays in succession; where the successive actions of these relays is such that control is effected by a first switch group (on a pin board connection panel), a second switch group (for carrying out switching operations for the step subsequent to each member of the first group) and a third switch group for selecting the said level signal; a remainder derived from the difference signal between set signals passed through these first and second switch groups, respectively, is multiplied by another remainder derived from the difference signal between the said an

Abstract: A die assembly with two spaced lips which define an elongated die orifice, wherein one of the lips is adjustable by means of wedges which are in sliding engagement with an inclined face of the lip and which are disposed in spaced relation along the length of the orifice and wherein for each wedge a spring is provided that keeps the wedges in firm contact with the corresponding faces, thereby to obtain a localized adjustment of the lip and a firm locking of the local lip position.

Abstract: This invention relates to a downstream closure device for apparatus used in treating large-diameter insulated electrical conductors, the device comprising a main exit gasket, a movable plug, an auxiliary exit gasket borne by the plug, and means for controlling the movement of the plug.

Abstract: An adjusting means for controlling the thickness of extrudate exiting from a die. The adjusting means includes a non-flexible block, connected to the die and provided with a tapped hole. Another block, a flexible block is also provided. It is connected to a flexible lip of the die and is also provided with a tapped hole. A bolt which includes a first threaded cylindrical section having a first threaded pitch is also provided. The first threaded cylindrical section is accommodated in the tapped hole provided on the non-flexible block. The bolt further comprises a second threaded cylindrical section having a second thread pitch accommodated in the tapped hole provided on the flexible block. The first and second cylindrical sections are distinguished in that the first and second thread pitches are different.

Abstract: Improved extrusion apparatus is shown for the preparation of a rod-like body from a coal-containing particulate mixture. Control mechanisms are disclosed for automatically controlling the throughput resistance experienced by the rod-like (or a developing version thereof) body through a die. Portions of the die wall near the outlet end thereof are adapted for inward displacement in response to these control mechanisms. This embodiment may also be coupled with a longitudinally movable die and control means for adjusting the length of the consolidating coal-containing mixture in contact with the surface of the movable die.

Abstract: An improved extrusion apparatus for extruding a tube of soft thermoplastic material of improved consistency and homogeneity is provided. A double walled piston having an annular chamber between the inner and outer annular walls thereof is mounted for sliding longitudinal movement between the interior wall of the apparatus housing and a longitudinal core disposed in the housing. The thermoplastic material fed into the apparatus first enters the annular piston chamber which, even during upward and downward movement of the piston, remains constant.

Abstract: An improvement in an apparatus for forming an outer corrugated tube wherein the corrugations of said tube abut an inner tube within said corrugated tube, said apparatus comprising means for forming an outer corrugated tube about a dye, means for forming said inner tube about a central mandrel within said corrugated tube, the improvement comprising means for urging an inner tube against the corrugations of said outer corrugated tube, said means comprising a presser floating mounted within said inner tube in facing relationship to said inner tube and bearing outward towards said inner tube.

Abstract: Plastic extruding and roll forming apparatus having a connecting passage at least partially formed by a plate which is swingable between open and closed position to conduct material from an extruder to forming rolls and to provide access and/or to release excess material in the passage. The extrusion and forming rates are controlled by the movement of the plate.