Abstract: In order to avoid the undulation of tolerance and to reduce the time and cost of grinding, the machine and method carry out a continuous dressing of the abrasive rim by a lateral cutter-wheel. A bell grinding-wheel and its rim are moved axially in a slow movement just exceeding the amount of attrition of the grinding-wheel. Thus the abrasive rim is continuously redressed. The level of the uppermost generatrix of the diamond cutter-wheel above a table exactly determines the thickness of the ground workpiece. The cutter-wheel is rotated by a motor; a rolling effect may occur. This machine and method are suitable for very precise mass-production grinding of industrial workpieces.

Abstract: The machine comprises a frame (1) which is secured to the connections (A--A') to which the hydraulic caliper for the brake is usually secured, the caliper having been removed previously. Due to such a connection, the frame (1) will be positioned exactly and firmly with respect to the brake disc, so that by mounting on the frame a grinding equipment comprising the axial feed for the grinding wheel or wheels (15--15'), the disc (D) may be ground without disassembling it. The brake disc is caused to rotate by the grinding wheel working thereon and, optionally, by a small motor-reducer, the arrangement being such as to perform a uniform grinding of the entire surface of the disc. The spindle of the machine, preferably, carries two grinding wheels which, successively, will engage both faces of the brake disc.

Abstract: A disposable depressed center grinding wheel for mounting on a rotatable threaded spindle of a power tool. The grinding wheel contains a retaining nut on one side and a backing flange on the other non-removably secured together on the grinding wheel without the aid of adhesives in such a manner that the grinding wheel is placed in compression when it is operably secured upon the spindle of the power tool under grinding loads. The nut and flange are secured together by upsetting one end of the nut causing it to protrude outwardly over the outer surface of the flange. A base member is loosely secured to the spindle of the power tool for engaging the outer surface of the backing flange during operation of the grinding wheel.

Abstract: A workpiece manipulating apparatus for faceplate panels of cathode ray tubes includes a conveyor for carrying panels along two groups of grinder stations in a pattern coordinated with carriage mounted loaders which move along the conveyor. The conveyor indexes to loading stations as do the loaders. Unground panels are sequenced to the stations as the loaders are present. Loaders pick the unground panels from the conveyor and transfer them to an orienting station which orients panels for loading into a grinder. Loaders pick an oriented panel from the orienting station and load it in to the grinder at the loading station. They also pick up ground panels from the grinder and place them in a reorient station and pick ground panels from the reorient station and place them on the conveyor in the position from which they removed an unground panel. The loader advances to a next loading station to load a next grinder and the conveyor with panels picked up at the preceeding station.

Abstract: An optical surface on a glass preform for an optical lens is simultaneously ground and polished. A glass blank is rotated by a work spindle mounted in an air bearing. A resin bonded diamond cutting ring is rotated by a tool spindle mounted in an air bearing. The axis of the tool spindle is set at an angle with respect to the axis of the work spindle with the edge of the cutting ring being centered on the axis of rotation of the blank. One of the spindles is moved linearly with respect to the other to move the cutting ring into engagement with the blank for grinding a precisely shaped, polished optical surface thereon. The spindles are mounted on a table and a driving motor for the linear drive is remote from the table to isolate the spindles from the vibration of the motor.

Abstract: A lead frame finishing apparatus comprises a tool supporting base on which a plurality of lead frame finishing tools are provided. Two frames support a lead frame transfer unit which clamps the lead frames at their edges and has an adjustable. A linkage unit connects one of the frames to the tool supporting base and pivots the tool supporting base around a pin to correspond the effective width covered by the tools to the width between the two frames which support the lead frame transfer unit.

Abstract: A structural foundation for a building possessing improved stability wherein the combination of a moisture-pervious layer in contact with the soil surface and an overlying fluid gathering member are located beneath the foundation slab. The adjacent foundation footing, provided with a vertical anchoring system, includes air passages to the gathering system thereby permitting air circulation to remove moisture from beneath the slab.

Abstract: A trench duct power compartment for use over a cellular raceway is fabricated by forming a rectangular-shaped blank and then stamping out a center section to leave portions which are contoured to the shape of the crests of the cellular raceway and thereafter bending the cut-out blank to simultaneously form upright side walls, downwardly extending concrete blockers together with connecting bottom end sections while leaving the bottom midsection open. The contoured portions of the concrete blockers having the same profile as the crests of the cellular raceway and snugly engage therewith.

Abstract: A modular house is composed of eight columns to be provided upright respectively at eight points, each two of which divide each side of an imaginary square on a piece of land into three equal parts, and panels to be attached to the columns. The modular house is of an extremely simple structure, requires a low cost for its manufacture, permits effective utilization of land and easy enlargement and/or remodeling, and provides a wide interior floor area.

Abstract: A suspended ceiling system for a room comprises a plurality of inverted T-shaped members suspended from the structural ceiling of the room and extending across the room, each T-shaped member having a horizontal base portion, and a plurality of open metal ceiling panels having opposed sides and ends and a bottom are supported by the inverted T-shaped members by means of a flange on one side wall of a panel resting on one side of the horizontal base portion which is received in a slot formed between the flange and detents in the side wall, while the other side of the horizontal base portion is received in slots in the end walls of the next adjacent panel.

Abstract: An anchoring device comprises an elongate tubular body, a plunger axially movable in the bore of the body to operate gripping means in the form of transverse dog plates which axial movement of the plunger causes to project through openings in the body to engage the surface of a hole drilled in a structure to which the device is to be secured.The anchoring device may be a wall tie with gripping means at each end to engage co-axial holes in two leaves of a cavity wall. Alternatively one or each gripping means may be replaced by a waisted, windowed portion of the wall of the body to be secured in the hole by synthetic resin. Means may be provided for connecting a grip-testing device to the wall tie and a modification allows the grip of one gripping means to be tested before the other is operated.

Abstract: Polyester resin glass fiber-reinforced similar planar panels and roofs formed therefrom incorporating as an integral portion of the panels one or more narrow ridges, including ridges disposed at angles to one another, for accommodating expansion or contraction relative to the substrate on which the same is laid.

Abstract: A fiberglass reinforced molded resin grating is formed of first and second sets of mutually parallel, interlocking fiberglass reinforced molded resin bars with the sets extending transversely to one another. One set consists of bearing bars of rectangular cross section including at longitudinally spaced positions within an upper edge, inverted U-shaped notches including oppositely directed, downwardly and outwardly oblique slots terminating at their upper ends adjacent the upper edge of the bearing bars in upwardly and outwardly diverging oblique cam surfaces. The second set of bars consist of cross bars of inverted U-shaped cross section including a horizontal base portion and a pair of downwardly and outwardly diverging legs of a thickness equal to the width of the diverging slots and being respectively received in said slots.

Abstract: A deformable molding is provided to form watertight sealing between formica covered panel members such as back-splash boards and countertops. The molding includes a first part to fit between first and second panel members and to be secured thereto by pressure-sensitive adhesive means. The molding also includes a pair of lip portions adapted to be biased into pressure sealing contact with respective adjacent panel members.

Abstract: A hollow, tubular beam is formed of an outer and an inner, U-shaped, elongated, roll-formed, sheet metal channel which are telescopically interfitted. The overlapping adjacent leg portions of each channel are provided with an inwardly bent rib and groove mechanical connection, but the curvature of the adjacent rib and groove surfaces are slightly different to provide a number of longitudinally extending, separated spaces therebetween. The free edge of one of the legs of the outer channel is bent normally to cover a corresponding corner-like shoulder bent in the adjacent inner channel leg. The radii of the flange and shoulder bends are slightly different to provide a slight, longitudinally extending space between them. Also, overlapping leg portions are spaced apart by integral embossments formed on the legs. The adjacent channel legs are adhesively bonded together by an adhesive material applied within the spaces.

Abstract: A bag inserter for inserting a liquid filled bag into a preselected position within a container. A funnel receives and guides the bag into the container. The funnel has a bag receiving aperture for guiding the bag into a tapered bag forming section. The bag passes into a bag discharge chute beneath the bag forming section and then through a bag discharge aperture formed at a substantial vertical angle across the lower end of the chute. Container positioning means are provided for positioning a container to receive the bag with a bag receiving aperture of the container adjacent the discharge aperture and with a wall of the container opposite the container bag receiving aperture at approximately the same angle at which the bag discharge aperture intersects the bag discharge chute.

Abstract: An improved assembly of bags (70) is disclosed which forms individual bags (100) connected in a continuous assembly with a line of perforations (50) between each of the bags. The bag assembly (70) is particularly suitable for indexing before a packing machine (88) for packing the individual bags with the bags being separable by tearing each bag off the assembly at the line of perforations (50).

Abstract: Disclosed herein is a rotary lawn mower comprising a housing supported for rotation along the ground, an engine mounted on the housing and including a rotatably mounted crankshaft, a cutter blade located in the housing and fixed to the crankshaft, a braking surface located on the crankshaft and having common rotation therewith, a brake arm supported for movement relative to the engine between a braking position and a non-braking position, which brake arm has thereon a brake surface which is engagable with the braking surface when the brake arm is in the braking position, a spring biasing the brake arm toward the braking position, an actuating linkage for moving the brake arm into the non-braking position against the action of the brake arm biasing spring, and a lost motion connection between the brake arm and the actuating linkage.

Abstract: A device for attaching a working implement to the front of a running vehicle for performing work while following the ground comprises a pair of opposite inflexible links pivoted at their rear ends to the front of the vehicle. These inflexible links are movable upwardly or downwardly and each link has a front end for movably supporting the front portion of the implement about a lateral pivot. A pair of opposite suspenders are each mounted on a longitudinally intermediate portion of each link for suspending the rear portion of the implement, each of the suspenders including a rod assembly pivotally connectable to the implement's rear portion and a resilient member. The rod assembly is inserted in an upstanding state through the link and is movable axially thereof to thereby permit upward or downward movement of the implement's rear portion due to the movement of the implement about the pivot.

Abstract: An improved mower clutch control is disclosed that transforms part of the upward height control movement of a mower deck into a forward declutching movement by angularly deflecting the mower deck in an arc through use of a pivotally connected lost motion lockout bolt.

Abstract: In an open-end spinning machine, a centralized main drive is provided to collectively drive spinning elements of a plurality of spinning stations installed next to each other. At each spinning station, a switch-over device is provided for switching each spinning station over to a stationary, centralized auxiliary drive. The main drive includes a main drive belt to collectively drive the plurality of spinning elements. An auxiliary drive belt driven at a second speed for selectively driving individual spinning units is powered by the stationary centralized auxiliary drive. Using its respective switch-over device, either the main drive belt or the auxiliary drive belt can be selected to drive a given spinning unit. Thread joining preferably takes place at a spinning unit (e.g. spinning rotor) speed relatively close to the production speed of the spinning unit so that strong thread joins and consistent thread results.

Abstract: Improvements in a spinning ring assembly for textile twisting apparatus are disclosed. A support structure that is attachable to a twisting unit supports an inside friction ring by means of a freely rotatable bearing assembly. A traveler is positioned on an upper surface of a spinning ring for free movement. The spinning ring is carried by an intermediate free supporting ring which is in contact with the inside friction ring.

Abstract: A process is disclosed for production of a heat-treated, coarse fiber of polyester-POY, whereby the fiber is first twisted and then continuously relaxed and tempered at a temperature from 130.degree. to 250.degree. C. to an extent from 20 to 55%. The slide-resistant fiber produced in this manner, displaying an elongation at break from 150 to 350%, a thermal shrink from +6 to -6% can be employed without further pre-treatment as weft yarn for tire cord webs.

Abstract: An improved partially-oriented nylon 66 (PON) spinning process and product are provided by increasing the molecular weight well above the levels customary for apparel end uses.

Abstract: In a device for the stranding or stranding-on of stranding elements to form a cable, stranding members of a stranding machine and storage receivers of the machine are combined to form a unit, and are present in duplicate to be interchangeable with each other. The unit with the storage receiver which has just been filled forms the active part and the other unit with the storage receiver which is to be filled forms the passive part in a stranding operation.

Abstract: In an open-end spinning process, fibers are twisted together into a yarn, alongside a suction slit, in a spinning nip formed by two friction rollers, in close proximity of each other and driven in the same direction, and subsequently drawn off therefrom. The length of the suction orifice of the suction slit is varied, before beginning the spinning process, in accordance with the thickness of the yarn to be produced. The spinning process is then started after such adjustments are made. Practice of the invention improves quality of the yarn, and saves power consumption and other resources by reducing required air consumption.

Abstract: A compact, lightweight thruster assembly (10) is provided consisting of a dual armature piston assembly (24). A single solenoid coil (46) operates either or both armatures (26), (34) depending on the level of applied current to effect either of two levels of predetermined impulse emitting from the thruster nozzle (20).

Abstract: The periodic shedding of vortices produced in a highly sheared gas flow, such as that encountered at the grain transition boundary in a solid propellant rocket motor or at the combustor inlet to a ramjet engine, is a significant source of acoustic instability which may result in unstarting of the ramjet engine or excessive vibration of the rocket motor. By restricting the transition boundary or combustor inlet at the sudden expansion dump plane (5), such as by locating an orifice plate (13) at the dump plane, the gas flow is separated upstream and produces a vena contracta downstream of the orifice, inhibiting the feedback of acoustic pressure to the point of flow separation and preventing the formation of organized oscillations. Incorporation of such a simple thin plate orifice at the dump plane reduces the periodic acoustic oscillations and thereby controls the detrimental oscillatory pressure fluctuations.

Abstract: The present invention is particularly concerned with the supply of fuel to fuel servos of gas turbine engines. A check valve (62) is positioned in a return pipe (40, 24, 22, 26) from a fuel spill valve (12) to the upstream low pressure side of a high pressure pump (10). An aperture (32) in a piston (30) of the check valve (62) produces a predetermined pressure drop across the check valve (62) when the flow of excess fuel reaches a predetermined value. A fuel servo shut off valve (64) is positioned in a pipe (42, 58) connecting a fuel flow regulator (14) to a fuel servo (80). A piston (46) of the fuel servo shut off valve (64) initially closes a chamber (56) to prevent fuel being supplied to the fuel servo (80), from the fuel flow regulator (14). The piston (46) of the fuel servo shut off valve (64) is moved against a spring (48) when the predetermined pressure drop is formed across the check valve (62) to allow fuel to be supplied from the fuel flow regulator (14) to the fuel servo (80) via chamber (56).

Abstract: A mechanical power regeneration system for a movable object comprising a sole variable displacement hydraulic pump being driven by the movable object, a first check valve connected between the output side of the pump and a first hydraulic line of a high pressure accumulator unit, a second hydraulic line of a low pressure accumulator unit, a second check valve connected between the second hydraulic line and the input side of the pump, a first controlled valve connected between the first hydraulic line and the input side of the pump and a second controlled valve connected between the second hydraulic line and the output side of the pump. When the movable object is to be slowed down by placing it in a braking mode, hydraulic fluid is transferred by the pump from the low pressure accumulator to the high pressure accumulator.

Abstract: A modified Stirling cycle engine is described in which an increase of efficiency is obtained by using the heat transferred by conduction from the walls of the expansion cylinder and the expansion piston and providing a labyrinth dynamic seal at least on the expansion piston.

Abstract: The invention relates to a thermal servomotor which includes two operating elements which act oppositely on an actuating bridge. The operating elements are thermally insulated from each other and each has a temperature-dependent filling and a separate heating element for differently thermally influencing the two fillings.

Abstract: A master cylinder for an hydraulic pressure system has a pressure cylinder (1) on which is mounted a reservoir (11), the cylinder having an open end closed by a cap (3). The cap is positively coupled to the cylinder (1) by a coupling device (26) arranged so that resulting from pressure applied to the interior of the cap (3) is transmitted via said device to the cylinder.

Abstract: An external combustion rotary engine comprising a motor member, a free-piston combustion member and a storage tank serving also as a heat exchanger and located between the motor and the combustor. The motor rotors rotate inside an enveloping structure eccentrically with respect to a power shaft to form alternatively compression and expansion chambers. Compressed air produced thereby is ducted first to the storage tank and then to the combustor for burning fuel to produce combusted gases which are in turn ducted to the storage tank where heat is exchanged between the hot gases and the cooler compressed air. The combusted gas is then expanded in the expansion chambers. A fraction of the compressed air is further compressed to a higher pressure level so that it may be used in air pad cushions to isolate the various engine rotating parts from the fixed structures surrounding them. The use of such air cushions prevents contacts between moving parts and eliminates friction, heat production therefrom and wear.

Abstract: In a supercharged marine diesel engine having at least one exhaust-gas turbocharger (6, 7) and a separate utility turbine (12) which is connected in parallel with the supercharging turbine (7) and delivers power, and having at least one auxiliary diesel engine (10) which is supercharged by means of a turbocharger and which drives a synchronous generator (11) supplying the ship's electrical system with electrical energy, the utility turbine (12) is coupled to a free shaft end of the auxiliary diesel/generator unit (10, 11). In this way, the auxiliary diesel engine (10) can be relieved of load, which results in a considerable fuel saving. In order to maintain a positive scavenging gradient when the auxiliary diesel engine (10) is relieved of load, a small portion of the exhaust gases of the marine diesel engine (2) is conveyed to a point upstream of the supercharging turbine (19) of the auxiliary diesel engine (10).

Abstract: Several embodiments of induction systems for internal combustion engines that improve the charging efficiency, particularly at low speeds. Each embodiment employs a plenum chamber upstream of the engine throttle valve and a reed type check valve admits air to the plenum chamber so as to improve charging efficiency at low speeds by maintaining an air flow in the induction system. In accordance with some embodiments, a supercharger is also employed which discharges into the plenum chamber upstream of the throttle valve. This arrangement minimizes pulsation effects from the supercharger being transmitted to the engine intake ports. In addition, the reed type check valve can be employed in many of the embodiments to bypass the supercharger under conditions when the supercharger is not generating any significant boost. The location of the reed type check valve relative to the plenum chamber and throttle valve of the engine minimizes pulsations from being transmitted from the intake ports back to the check valve.

Abstract: A number of embodiments of two-cycle, turbo-charged internal combustion engines having an improved arrangement for locating the inlet of the turbine stage so as to minimize the necessity for backflow in the exhaust conduit. A number of embodiments are illustrated for applying this principle to outboard motors and in many of these embodiments, twin turbo-chargers are employed. The turbo-chargers are disposed in such a relationship so as to permit a compact relationship and to avoid close proximity between the exhaust conduits and the compressor stages.

Abstract: A Rankine cycle power plant utilizes as a working fluid and compounds selected from the group consisting of bicyclic hydrocarbons, substituted bicyclic aromatic hydrocarbons, heterocyclic bicyclic aromatic hydrocarbons, substituted heterocyclic bicyclic aromatic hydrocarbons, bicyclic compounds where one ring is aromatic and the other condensed ring is non-aromatic, and their mixtures.

Abstract: Method and system for generating electric power utilizing a coolant circuit, in which a coolant is evaporated at a lower level position, allowed to rise via tubing to a higher level position, liquified at the higher level position, and allowed to flow down to the lower level position in tubing where it impinges a hydraulic turbine connected to a generator. The preferred embodiment includes a vertical tube system of approximately 3000 m length, composed of a long tube for rising vapors and fall tubes for falling liquid coolant. Multiple cooling systems located at the higher level position, including a counterflow cooling system, forced-draught type air cooler, and a step-by-step cooling process, are utilized to liquify the coolant and provide working vapor to power the cooling systems. The coolant is composed to C.sub.3 H.sub.8 and NH.sub.3, which is varied on a percent composition basis to match atmospheric weather conditions.

Abstract: A subcooler is provided in heat exchange relationship with the high pressure liquid refrigerant line flowing to the indoor coil, such that when a low pressure condition is sensed on the low pressure side of the system, the subcooler flashes a portion of the liquid refrigerant to the low pressure side to thereby maintain suction pressure to the compressor, while at the same time subcooling the liquid refrigerant flowing to the fan coil to thereby increase its efficiency.

Abstract: A refrigerated showcase in which refrigerated air for refrigerating the interior of the showcase and preventing ambient air from invading in the showcase is circulated across a front opening of the showcase and through a bottom wall, a rear wall and a top wall of the showcase, is improved according to the present invention. The improvements reside in that a gas-permeable spacer is disposed at the end of shelves within the showcase and spaced from the front surface of the rear wall to form a refrigerated air introducing duct space between the spacer and the rear wall.

Abstract: A five-way valve includes a cylindrical valve body. A piston member is employed in one end of the cylindrical valve body to define a high pressure chamber and a first pressure chamber. A defrosting valve is employed in the other end of the cylindrical valve body to define a second pressure chamber. A slider valve member coupled to the piston member is slidably employed within said high pressure chamber into which the high temperature and high pressure refrigerant from the compressor is induced. An electromagnetic valve is connected between both the first and second pressure converting chambers, and the inlet of the compressor.

Abstract: An ice making machine having a cylindrical drum member whose inner wall is formed with surface irregularities. The ice making machine includes an adiabatic member which defines a cooling medium chamber relative to the inner wall. A rotary shaft is rotatably disposed in the drum member. The shaft has an upper portion provided with a water sprinkling pipe which is in fluid communication with a water tank through a water passage formed in the rotary shaft. A blade is fixedly secured to the shaft at a position confronting the cooling medium chamber. The cooling medium chamber is divided into a plurality of compartments to which cooling medium is respectively introduced.

Abstract: A disc is disclosed which comprises a top layer, a middle layer, and a bottom layer. The top layer is placed proximate to a high temperature reactor and at least the outer surface of the top layer is made of a material which allows it to act as a substrate against which molten particles are impacted to microatomize the particles. The layers are positioned one above the other with a first space between the bottom surface of the top layer and the top surface of the middle layer, and a second space between the bottom surface of the middle layer and the top surface of the bottom layer. The top and bottom layers are joined together and stabilized by a peripheral wall around the circumferential edge of the top and bottom layer. The middle layer is fixedly mounted to the bottom layer. The middle layer is smaller in diameter than the diameters of the top and bottom layers so that a third space is defined between the inner surface of the peripheral wall and the circumferential edge of the middle layer.

Abstract: A freezing apparatus capable of chilling articles to be chilled or frozen by chilling each article substantially from the entire surface thereof through contact freezing for quick chilling or freezing. The freezing apparatus comprises a rotary chilling plate disposed in a horizontal position for rotation about a vertical axis, an annular tube formed of a flexible sheet, placed over the rotary chilling plate so as to be in contact with the upper and lateral surfaces of each article placed on the rotary chilling plate, and adapted to be driven together with the rotary chilling plate about the same vertical axis, and a brine tank disposed under the rotary chilling plate so that chilly brine supplied therein flows along the lower surface of the rotary chilling plate as the same overflows the brine tank, and adapted to be rotated together with the rotary chilling plate.

Abstract: Spaced based burst power fuel cells generate large thermal loads in very short time periods. In order to avoid external venting or the use of heavy radiators in space vehicles, such fuel cells must include onboard closed-loop cooling systems. Utilizing multiple heat sinks containing subcooled ice as a cooling medium, sequentially contactable with a coolant that passes through the fuel cell, provides a safe, highly efficient and low weight heat absorption capability.

Abstract: The fancy artefact described has a band (1) made of a first thermoplastic plastic material and a clasp (4) which is solid with the band and which is made of a second thermoplastic plastic material which may have a melting temperature greater than that of the first plastic material. One such artefact may be a wristlet having a pair of bands, the clasp being provided on the free end of one band and being fastenable to the free end of the other band.

Abstract: An improved wrist bracelet designed to carry a ring for supporting keys, as well as another connection designed to carry additional hanging objects and when not in use, be stored within the continuous coil of the bracelet body. The bracelet body itself is preferably fabricated from helically wound, perspiration impervious, attractive materials such as polyethylene plastic, having sufficient resiliency to allow the bracelet to be expanded sufficiently to be placed over the hand or foot and worn on the wrist or ankle.The coil making up the body of the bracelet has its ends joined together in a crimped connector, having a perforated tab extension adapted to receive other hanging objects. The crimped connection and tab extension are dimensioned to have a maximum transverse dimension less than the internal diameter of the coils making up the bracelet body, whereby the interconnection member can be inserted within adjacent coils in order to keep it out of sight and out of way when not in use.

Abstract: The invention concerns a process and a circular knitting machine for the production of knit goods with combed-in fibers, in which an amount of fibers synchronous with the needle cylinder rotatory speed is fed to a teasing cylinder rotating at high speed, transferred by the latter to the comb-in zone, and taken from the needles in the comb-in zone without contacting the teasing cylinder. To prevent the development of areas overfilled with fibers or short of fibers in the finished knit goods on account of the contact-less fiber feed, during or before abrupt reductions or increases in the rotatory speed of the needle cylinder, at least temporarily smaller or larger amounts of fibers are fed to the comb-in zone than corresponds to the synchronous amount of fibers.

Abstract: Washing machine for washing off or separating plastic film, for example polythene, from paper or cellulose fibers or other pollutants comprising a container 1 into which the material to be washed consisting of plastic film with residual quantities of paper or cellulose or other pollutants is introduced at the same time with the water or subsequently thereto and then stirred by washing mechanical means, wherein said container 1 has a concentric surface 3 inside it which is provided with holes and forms an annular chamber 4 and wherein one or two vertical rotary shafts 5 and 6 are provided rotating in opposite directions with respect to each other and respectively bearing two series of radial agitators 7 and 8 penetrating into each other in the center of the container so that the water containing paper or cellulose fibers or other pollutants passes through the holes being thus discharged separately from the plastic film and wherein each of said series of agitators 7 and 8 carries one or more agitators provided