Abstract: Extrusion die assembly for forming honeycomb structures, which comprises a die having a discharge surface provided with grid-shaped slits for discharging a honeycomb shaped body and an inlet surface provided with a plurality of independent feed inlets, a mask having an orifice for determining the outer shape and dimension of the extruded honeycomb structure and a ring having an orifice for restraining supply of the batch material into the feed inlets at the periphery of the inlet surface.

Abstract: A filter assembly for extruded polymer melts is described which comprises a filter having retained between inlet and outlet manifolds with a contact pressure that can be varied. A primary seal device between the manifold and the housing is located in a rabbet in either the housing or the manifold at the contact plane. This seal responds to pressure from the polymer melt flow by deforming and increasing the contact pressure between the manifold and the housing. Thus the greater the pressure at which the melt is extruded, the tighter is the seal.

Abstract: A filter assembly for an extrusion apparatus comprises a stationary filter having a flat, hard surface and slidable means having a plurality of apertures for both accumulating filtered debris and cleaning the filter surface when the debris is removed by sliding a clogged slide aperture out of position while replacing it with a clean aperture.

Abstract: Dough is extruded from a screw extruder through a nozzle, preferably a twin-slot nozzle, and an apertured blocking plate is placed between the tip of the extrusion screw and the nozzle assembly for making the pressure distribution across the dough in a pressure equilization chamber between the blocking plate and the nozzle more uniform and for controlling the rate of flow of the dough towards the extrusion nozzle slots. The blocking plate has two series of parallel channels arranged on two opposed arcs of the same circle centered on the central axis of the nozzle (the axis of the extrusion screw) and the series are symmetrical about a plane of symmetry of the nozzle.

Abstract: A pourable substance is introduced into a container having a perforated bottom which defines, together with a mold, forming space which is to be filled with the pourable substance. The forming space has a configuration substantially corresponding to that of the preform to be made, and the pourable substance passes through the perforations of the bottom of the container and is distributed throughout the forming space, owing to vibrations to which the perforated bottom of the container, either alone or together with the container, is subjected. The pourable substance is compacted within the forming space due to the vibration of the perforated bottom so that the preform can be subsequently taken out of the mold and compressed elsewhere into a profiled article, or the profiled article can be produced from the preform directly in the mold.

Abstract: A device for changing a wire netting in a filter device for synthetic resins comprising a die body fixed in contact with an extruding port of an extruding machine, the die body having a first hole for change drilled therein, a guide inlet communicating with the first hole for change and an extruding port, a pair of second holes for screening drilled in the die body respectively at both sides of the hole for change, a pair of guiding pipes respectively communicating with the pair of second holes for screening, a pair of exhaust guide ways respectively communicating with the pair of second holes, a pair of valve guide ways respectively having a larger diameter than those of the pair of exhaust guide ways and respectively communicating with the pair of exhaust guide ways and an exhaust port, one end of which is opened and the other end of which communicates with the center and connecting portion of the pair of valve guide ways, a valve for changing flow which has a guide opening through which the guide inlet com

Abstract: A filtration device for filtering of temperature controlled process liquids, as for example, liquid hot melts. The filtration device includes an outer housing with a sleeve disposed within and spaced from the side wall of the housing to form a temperature regulating fluid chamber therebetween. An elongate member with a groove or channel formed therein extends between the sleeve and the housing side wall. A filter assembly having an outer casing may be removably disposed within a filter chamber formed by the sleeve. In this case, the filter casing would have a fitting extending from the casing and through the elongate groove to a process liquid inlet pipe connected to the housing side wall. Releasable bolts operatively engage the filter casing to permit holding of the casing in the filter chamber. Another fitting extends from the casing and through the elongate groove to a process liquid outlet pipe connected to the housing side wall.

Abstract: An extrusion die for forming thin-walled honeycomb structures is provided comprising a plurality of discharge slots for forming unit cells of a predetermined web thickness formed transversely in the die to a predetermined depth in the outlet face and a plurality of mutually independent feed passageways formed transversely in the die extending from the inlet face of the die and communicating with the discharge slots. The cross-sectional area of the feed passageways is larger than the cross-sectional area of the discharge slots which are fed by the feed passageway, thereby applying sufficient flow resistance to the extrudable material and the discharge slot.

Abstract: The plastics processing machine employs a mixer which has a static mixing device formed of at least one insertion member composed of guide elements in layers which form flow channels. The hydraulic diameter d.sub.h is made no more than eight millimeters (8 mm) in order to obtain a high mixing quality. The hydraulic diameter may vary along the mixer, for example by decreasing from the inlet end to the outlet end.

Abstract: A filter screen exchanging device having a pair of parallel slide plates 12 disposed in branched passages DK, EL of a plastic resin extruder 10. Each slide plate has a shouldered hole 14 on one side accommodating a breaker plate 15 having a plurality of flow nozzles 20, a filter screen 17, and a threaded screen cap 18 having a plurality of trapezoidal apertures therein. The other side of each slide plate is blind, and the plates are alternately transferred for screen and cap exchange by hydraulic cylinders 13. The extruder operation is thus continuous, the breaker plate is not exchanged with each screen and cap replacement, and the screen mounting arrangement is designed to minimize air entry and resin leakage during slide transfer.

Abstract: Apparatus for the production of a middle layer of chipboards or the like and/or for the manufacture of chipboards formed only from middle layer material includes at least one spreading station associated with a spreading chamber arranged above a moving support for the reception of a chip layer or the like, the entire fine or coarse materials serving for the formation of a type of middle layer being fed by at least one metering tank to the support. The apparatus is further characterized in that at least one inclined screen which can be reciprocated in an essentially horizontal direction is disposed underneath the delivery point of the metering tank and a spreading roll is disposed underneath the lower edge of the screen in parallel to the screen edge, the roll serving for feeding the coarser material to the space lying beneath the screen.

Abstract: A filter for polymer melts and solutions comprises a casing having an inlet opening and an outlet opening. The casing accommodates a hollow mandrel supporting filter elements which are axially unmovable due to the provision of clamping flanges. Each element consists of a spacer plate located between filtering baffles, a sleeve having through radial passages communicating the inner space of the filter element with the inner space of the mandrel, the sleeve being mounted between the filtering baffles on the periphery of the mandrel, and a seal located between the filtering baffles on the periphery of the spacer plate. In addition, the casing accommodates auxiliary seals provided between the filter elements on the periphery of the mandrel and a spacer device arranged between the filter elements. The spacer device comprises auxiliary spacer plates each corresponding to the filtering surface of the filtering baffle. The filter is also provided with a washing device.

Abstract: Soap worked in a plodder with introduction of a color dye for color striation of the extruded column is extruded through a die plate that has a rectangular opening corresponding to the major face dimensions (length and width) of the product bar so that the extrusion grain is perpendicular to the major faces, and the extruded column is severed at distances equal to the product bar thickness to provide blanks that are pressed in a direction parallel to the extrusion grain to form the product bar. Special locations for color introduction are provided and a unique "carrara" marble effect is produced in the bar.

Abstract: The disclosure concerns apparatus which automatically performs screen-changing functions associated with the use of screen devices for filtering extruded plastic materials. The apparatus includes a slide assembly with two apertured recesses for receiving screen devices, and mechanisms for aligning the recesses alternatingly with a direction of advance of the extruded plastic material. A screen device is replaced within one recess, as a screen device within the other recess filters the extruded plastic material. Such screen device replacement is provided through the automatic, sequential operations of screen device ejection, screen device carrier, screen device introducing and screen device reloading mechanisms.

Abstract: A process for filtering a liquid through a combination of a first sieve, a sand pack and a second sieve in the direction of flow of the liquid, is described. This process differs from the known process in that the liquid passes through a filter pack in which the mesh width of the first sieve is at most equal to the mesh width of the second sieve, and the mesh width of the second sieve is smaller than the smallest particle size of the sand in the sand pack. Furthermore, the mesh width of the second sieve is at most 80 microns.When using this process uniform filaments without variations in titer from filament to filament or over the length of a filament are obtained. The rise in pressure relating to time is very small.

Abstract: A kneading and extruding apparatus for extrudable material such as soap material and its additives, comprising a perforated rotating disc at an output end of a kneading screw shaft, a perforated stationary disc adjacent to the rotating disc to form a clearance therebetween, a punching plate fixed to the stationary disc confronting the rotating disc and formed with a great number of small holes having a diameter smaller than those of the holes of the rotating and stationary discs, and a blade-like cutter for serving the material extruded through the holes of the stationary disc. The material is sheared in the clearance between the rotating disc and the punching plate to blend the material and the additives effectively.

Abstract: This invention relates to an improved injection molding filter assembly to be located in a passage between the molding machine and the mold to remove contaminants such as wood, paper, or metal from the molten plastic material or melt. The filter assembly has an upstream circular plate located adjacent a downstream circular plate and the plates are secured against relative rotation by pins passing therethrough. The upstream and downstream plates each have a number of circular openings therethrough arranged in concentric circles with each of the openings in each plate partially overlapping at least two openings in the other plate, whereby a plurality of restricted eye-shaped openings are provided through the filter assembly in the abutment plane between the two plates. The filter assembly is securely retained in mating seats in the back plate and the adjoining manifold spreader plate nozzle.

Abstract: Ice confections are extruded through a multiplicity of holes. Unevenness of flow during extrusion is reduced. The holes can be arranged in an array to determine the cross-section of the extruded ice confection. Extruded ice confections can be readily prepared with, in cross-section, very fine detail e.g. key-shaped, or heart-shaped or containing air passages.

Abstract: An extended-area filter for filtering plastic stock at high pressures has a breaker plate with an undulating surface confronting the oncoming stock which substantially doubles the available filter area. Screen packs having fixed therein the same surface configuration are supported uniformly on the undulating surface against collapse under the operating pressure.

Abstract: The rigidity of a die used in pelletizing plastics is increased by connecting the rear center of the die with a support fastened to the center of the breaker plate. The die body, support, and breaker plate are attached to the extruder in an in-line manner.

Abstract: Plastically moldable ceramic batch material, which may be flowably extruded under pressure into a self-supporting article of desired shape and configuration, is passed through a flow homogenizer positioned within an extrusion cylinder upstream of an article-forming extrusion die positioned on the discharge end of the extrusion cylinder, to thoroughly homogenize such batch material during the extrusion operation and prior to being fed through the article-forming die.

Abstract: A sintered porous metal filter having upper and lower surfaces with grooves in the filter alternately in communication with the upper and lower surfaces is strengthened by filling the grooves with granular material. The filter is formed from an alloy containing 30 to 40 percent by weight chromium, about 3 percent by weight silicon, minor amounts of carbon and nitrogen and the remainder iron.

Abstract: Apparatus for filtering molten plastics and for extruding plastic strands has a filter combined with a die head into an interchangeable unit. Plastics strands are discharged from the die head. The interchangeable unit is movable transverse to the direction of flow of plastics material.

Abstract: Variegated detergent bars are made by mixing together pieces of soaps of contrasting colors in a vacuum zone and plodding the mixture in such manner as to fuse the different soaps together but maintain colors separate, thereby producing a desired pattern therein, preferably resembling marble. The pattern is controllable by variations of the proportions of material charged, plasticities thereof, speeds of the worms, design of the compression-extrusion head and preferably, by extruding the soaps through small openings in a plate after the final plodder worm, cutting the extrudates and imparting transverse or radial motions to them before final extrusion.Also described are plodding and extruding apparatuses utilized to practice the variegating process.

Abstract: In combination with extrusion apparatus having a liquid source, a die and alternate filter means, a continuous flow plug valve unit is provided for use in changing filters; the valve unit comprises a valve housing, plug means seated in the housing, and control means for moving the plug means with respect to the housing. Passage means in the plug means and housing overlap in all operative positions of the valve to provide an available flow passage of hydraulic flow radius everywhere at least about equal to that of the inlet from the source; the valve presents no restriction to the flow of liquid from the source.

Abstract: An apparatus for the continuous filtration and flow of molten thermoplastic polymer from a melt source to a shaping apparatus. The apparatus is characterized by the employment of a melt reservoir whose level is regulated by a level control means. Melt flow to the shaping apparatus is regulated by the level control means which controls the flow rate from the melt source as a function of the level in the melt reservoir.

Abstract: A spin pack assembly for the extrusion of synthetic filaments. Novel features are the polymer flow channels of the breaker plate and spinneret plate which comprise a capillary with open ends, the entrance ends of the breaker plate and spinneret plate and the exit end of the breaker plate defining, respectively, enlarged inlets and outlets, the walls of which intersect with adjacent walls to form a closed, interlocking network of ridges on the top surfaces of the breaker plate and spinneret plate and on the bottom surface of the breaker plate, so as to eliminate areas of low or zero velocity flow of polymer and to reduce pressure differences in polymer in the breaker plate-spinneret plate area.