Abstract: A T-die adapted for extrusion molding of a plastic material such as plastic film is constituted by a lower stationary half and an upper movable half. The stationary half is integrally provided with a steady lip portion and a movable half is provided with a base portion and flexible lip portion so as to form a gap in slit form between the steady and flexible lip portions. The gap is adjusted partially by a plurality of adjusting bolts screwed to the upper portion of the movable half extending to cover the flexible lip portion with space, the bolts being arranged in a line along the longitudinal direction of the T-die and spaced equally with each other. Each bolt has such a length that the front end thereof downwardly presses the flexible lip portion when the bolt is driven downwardly. The flexible lip portion is provided with a plurality of U-shaped grooves each disposed between the adjacent two bolts and having a width of an opening substantially equal to the distance between the adjacent two bolts.

Abstract: A food product forming device is provided with a dispensing nozzle through which the food product, in slurry form, is continually fed to the outlet end thereof where a sleeve including a cut off sleeve and an outer forming tube are mounted about the exterior of the nozzle so as to be movable towards and away from the dispensing end of the nozzle; the sleeve is provided with passages for receiving and distributing a discharging fluid to the food engaging portion of the sleeve to assist in discharging the food product from the lower end thereof.

Abstract: A potter's table including a rotating pneumatic clay extruder coupled to the potter's wheel. Clay is fed from a vented storage cylinder in centered relation to the wheel past an interchangeable template via a hand valve controlled pneumatic piston and rotatable ram head coaxially mounted within the storage cylinder. An electric foot-operated, proportional speed belt drive, belt tensioning assembly and upper and lower bearing assemblies support the cylinder and potter's wheel in rotative relation to the table and pneumatic piston.

Abstract: 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 is also of hollow, double wall construction in several of the disclosed embodiments. A plurality of longitudinally spaced apart tubular nozzle casing receptacles extend vertically through the bottom one of said leg sections, and a pump block rests upon such bottom one of the leg sections so as to completely cover each of the casing receptacles. Each pump block includes a connecting plug aligned with each of the receptacles for releasably mounting a nozzle assembly within each of the receptacles, and the pump block is connected to a metering pump which is disposed between the parallel leg sections for pumping the melt through the melt supply lines of the pump block and to the nozzle assembly.

Abstract: A single-screw extruder for producing thermoplastic and elastomeric products includes a hollow cylindrical barrel, which is provided with radially inwardly protruding mixing elements, which are adapted to move through recesses formed in one or more helical lands of a screw, which is rotatably mounted in the barrel. To facilitate the assembly of the screw extruder and to permit repair thereof without a need to replace the entire housing, the mixing elements (9) are provided on split rings (9), which are held axially spaced apart by interposed spacing rings, or which are clamped in position in grooves formed in adjacent annular sections of the barrel.

Abstract: 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 the spin block, and a tubular casing for the nozzle assembly, with the connecting plug and casing being threadedly interconnected. The mating threads are preferably in the form of a threaded bayonet joint comprising multiple thread segments so that the nozzle assembly may be attached to and removed from the connecting plug by a partial rotation of the nozzle assembly. Also, the nozzle assembly is sealed to the melt supply assembly by an arrangement which includes a piston mounted for limited movement within the casing of the nozzle assembly and below the connecting plug, and such that the piston is biased into sealing contact with the plug by the pressure of the melt.

Abstract: A cavity transfer mixing extruder which includes an extrusion unit and a mixing unit, which are united coaxially. The extrusion unit includes a barrel provided with a feed opening through which materials are fed into the barrel, and a screw shaft coaxially and rotatably extended through the barrel. The mixing unit includes a housing, a stator fixedly fitted in the housing and a first cavity group including circumferential cavity rows of cavities in the inner circumference thereof, and rotor joined coaxially to the front end of the screw shaft, coaxially rotatably extended through the stator, and provided with a second cavity group including circumferential cavity rows of cavities in the outer circumference thereof.

Abstract: A method of reducing wastage during the start-up phase of an extrusion device used to produce extruded profiles such as tread strips for vehicle tires from a plurality of mixtures is disclosed. The extrusion device comprises a plurality of extruders each extruding a component of the profile and each extruder has its own drive means. The outlets from the extruders communicate with a template member having flow channels formed therein which lead into a common extrusion port. The drive means are actuated simultaneously and the pressure of each of the components is monitored in the outlet region of each extruder. These pressures are compared with a pre-determined desired pressure by a control device, which device switches-off the appropriate drive means as each desired pressure is attained. When all desired pressures have been attained, all of the drive means are re-actuated simultaneously by the control device.

Abstract: In a method for the continuous pressing of sheet material in a reaction zone between two endless, heated press belts of a double band press at increased process temperatures, the capability for operating at process temperatures which are higher than critical, permissible operating temperatures of the double band press is achieved by heating the press belts in such a way that they have the highest temperature at their outsides facing the sheet material with heat flow through the press belt being effected from the hot outer side to the opposite inner side of the press belt. The heat flow direction in the reaction zone which otherwise leads from a pressure plate to the press belt outer side is thus reversed and, in apparatus for performing the method, heating members are arranged in the vicinity of the press belt on the outer side thereof shortly before the reaction zone.

Abstract: The stretching machine comprises a spinning bar, a blowing compartment, and a stretching chamber. The spinning bar has a plurality of spinning nozzles, from which the individual fibers are put out or extruded in a thermoplastic condition. The blowing compartment is provided with blowing nozzles or orifices through which air is introduced as a cooling as well as stretching means. The stretching chamber has stretching chamber walls which can form an accelerating constriction having a venturi nozzle like shape as seen in vertical cross section. The stretching chamber walls comprise a deformable material, which permits a deformation of the stretching chamber walls during operation. A plurality of adjusting mechanisms for adjusting the shape of the stretching chamber walls are connected to and distributed at various heights over the stretching chamber walls.

Abstract: An adjustable feed block for a coextrusion die is provided. The feed block comprises a main central channel for conveying a main stream of molten thermoplastic material towards a coextrusion die, and at least one secondary channel, substantially parallel to the central channel, for conveying a second molten thermoplastic intended to form a local coating layer on the main stream. The downstream end of each secondary channel is inclined relative to the central channel and connected to a portion of the periphery of the said channel. The connection between the central channel and each secondary channel is laterally delimited by the ends of two adjustable slides which can be moved at right angles to the axis of the central channel. These slides make it possible to adjust, during operation, the position and width of the streams of thermoplastic deposited on the main stream.

Abstract: A rotary molding apparatus is described, including a heating chamber, cooling chambers and supports for molds which melt and cast workpieces of plastic. The cooling chambers can be arranged circularly around the heating chamber which is disposed at the center, or the heating chamber can be movable such that an opening thereof can be selectively aligned to one of the cooling chambers. The molds can be moved via the supports from a cooling chamber to the heating chamber and back again. This apparatus optimizes component utilization and minimizes cycle times.

Abstract: A die for extruding honeycomb structural bodies includes a plurality of ceramic batch exhaust grooves and a plurality of ceramic batch supply apertures. Tubes are fitted in at least some of the ceramic batch supply apertures to improve or make constant the surface roughness and dimensions of inner surfaces of ceramic batch supply apertures through which the ceramic batch passes, thereby producing perfect ceramic honeycomb stuctural bodies. The adjustment of flow of ceramic batch is so simplified that any other controlling plate which would be required in the prior art is not needed for controlling the flow. When the supply apertures have been worn off, the tubes are exchanged by new ones to restore the required inner surfaces easily.

Abstract: Apparatus for forming filled dough products comprising: piston extruders for pumping dough and filling to measuring devices which extrudes external dough tube with internal filling through a die head so that part of the dough tube of one item is extruded without filling, a twisting device for turning just extruded item around its longitudinal axis and twisting the empty part of the dough tube, and pinching device for forming closing and separating ends of the items.

Abstract: A gas-loaded diaphragm for exerting a predetermined pressure on a ceramic substrate during sintering to prevent x-y shrinkage. In the most preferred embodiment, the diaphragm comprises a gas-filled base composed of two opposing discs, and a substantially hollow gas-filled toroid container disposed around the perimeter of the opposing discs and communicating therewith to permit gas flow therebetween. This diaphragm is disposed in relation to a ceramic substrate-containing cell so that when it is heated to a desired temperature, the gas in the diaphragm expands and forces the two opposing discs apart to thereby exert a predetermined pressure on the ceramic substrate-containing cell.

Abstract: A rod gland (28) has axially extending inlet and outlet grooves (64,66) at circumferentially spaced positions on a cylindrical outer surface (34) and is provided with an annular seal (60) for preventing leaks between the grooves (64,66). The annular seal (60) is positioned in a groove (59) between an adapter hub (36) and a lower clamping ring hub (38) surrounding and in sliding engagement with the cylindrical outer surface (34) of the rod gland (28) so that at the inlet and outlet grooves (64,66) the sealing is on three sides of the annular seal (60) and between the grooves (64,66) the sealing is on four sides of the annular seal (60).

Abstract: A push rod is forwarded to extrude viscous material in a tubular container from the nozzle. When the extrusion of viscous material is finished, i.e. stopping the forward operation of the push rod, the push rod is allowed to go back by a force resulted by expansion of air unavoidably contained, in the tubular container thereby absorbing expansion of air so as to prevent unwanted discharge of the viscous material due to an inner pressure of the tubular container.

Abstract: Particulate mats are transported from the downstream end of an upstream conveyor normally moving continuously in a longitudinal transport direction at a predetermined relatively slow speed to a press downstream in the direction from the upstream conveyor that receives the mats and presses them into hard panels by supporting the mats between the upstream conveyor and the press on a downstream conveyor having an upstream end spaced downstream from the downstream end and a downstream end at the press and an intermediate conveyor extending between the upstream end of the downstream conveyor and the downstream end of the upstream conveyor and having a length in the direction at least equal to that of each of the mats in the direction. A carriage supporting the downstream end of the upstream conveyor, the intermediate conveyor, and the upstream end of the downstream conveyor is reciprocated in the direction at a frequency related to mat size and speed.

Abstract: The die includes a body provided with a plurality of polymer flow channels and a plate fixed to the front surface of the body and bored at locations corresponding to each channel. An insulating layer is positioned between the body and the bored plate. The channels include a thermoregulating system for the die body. A plurality of nozzles is provided, with the nozzles being rooted inside the die body at locations corresponding to the channels. The nozzles protrude from the body itself to cross through the insulating layer and the bored plate. The nozzles are made of a metal having a thermal conductivity higher than 60 W/m.degree.K.

Abstract: A differential pressure thermoforming machine has a female mold with a female mold cavity, and an opposing mold, with a mold closing portion cooperable therewith. A foam injection head is perimetrally separated from the mold closing portion and is provided on the opposing mold. When the molds are initially closed, a differential pressure is created in the molds to cause the heated plastic sheet to move into contact with the mold cavity and form a configured pocket in the sheet. Mechanism is provided for releasing the plastic sheet from the carriage in which it has been moved between the molds, after the molding operation, to the cavity in the female mold, after which the molds are restored to spread-apart position.