US3413191A - Devices for producing sheets and tubes of fibrous cement or the like by winding a web of plastic mass of fibrous cement on to a sizing roll or a mandrel - Google Patents

Devices for producing sheets and tubes of fibrous cement or the like by winding a web of plastic mass of fibrous cement on to a sizing roll or a mandrel Download PDF

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US3413191A
US3413191A US433760A US43376065A US3413191A US 3413191 A US3413191 A US 3413191A US 433760 A US433760 A US 433760A US 43376065 A US43376065 A US 43376065A US 3413191 A US3413191 A US 3413191A
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roll
fibrous cement
sizing roll
web
winding
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US433760A
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English (en)
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Oesterheld Karl Adolf
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/42—Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces
    • B28B21/48—Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces by wrapping, e.g. winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
    • B28B1/40—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding
    • B28B1/42—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding using mixtures containing fibres, e.g. for making sheets by slitting the wound layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/42—Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces
    • B28B21/50—Details of compression or compacting means

Definitions

  • the sizing roll is rotated by a stationarily mounted breast roll, which is driven at constant speed by a motor and supports the sizing roll mounted on vertically movable supporting arms, through the intermediary of the web of fibrous cement fed between the breast roll and the sizing roll by a likewise driven endless felt belt and transferred to the latter roll, and through the coiled layers of web material already produced on the sizing roll.
  • the peripheral speed of the sizing roll is equal to that of the breast roll.
  • the mandrel In tube producing machines the mandrel is driven in a similar manner by the endless felt belt through the web of fibrous cement fed by the latter and through the coiled layers formed on the mandrel.
  • the mass of fibrous cement is effective as a power transmitting medium in that a thrust present in the direction of rotation of the breast roll and in the feed direction of the felt belt is acting on the web of fibrous cement being fed and on the already coiled layers of web material and puts the sizing roll or the mandrel into rotation.
  • the thrust must not exceed a certain value which is dependent on the kind of fibrous cement mass being processed as -well as on the thickness of the web of fibrous cement on the felt belt, since otherwise there is a risk of structural distortions occurring in the web of fibrous cement to be coiled and in the already produced coiled layers, and of the individual coiled layers not being uniformly compacted, matted and dewatered.
  • This has to be taken into consideration when rating the speed at which the web of fibrous cement is running on to the sizing roll or the mandrel. A faster production speed as is desired for increasing the output and for economical reasons could hitherto not be realized because the accomplishment of unobjectionable finished products would then be no longer ensured.
  • a method of producing sheets and tubes of fibrous cement or the like which comprises the steps of winding a web of plastic mass of fibrous cement in several layers on to a sizing roll or a mandrel, respectively, dewatering and compacting said web and transmitting during the winding, dewatering and compacting operations a torque, preferably a torque becoming increasing larger with the growing wall thickness of the hollow cylinder of fibrous cement under construction, directly to the sizing roll or the mandrel, respectively, so that vduring the winding operation the sizing roll or the mandrel, respectively, exerts a force on the mass of fibrous cement that reduces or cancels the thrust exerted on the mass of fibrous cement by a breast roll driven at constant speed and by a Web transporting belt or becomes effective as tensile force when further increasing the driving torque, by which tensile force the fibres oriented in the winding direction and the individual coiled layers are prestressed.
  • the speed of building up the hollow cylinder of fibrous cement can be increased without thus involving the risk of damaging by deformation the web of fibrous cement running on to the sizing roll or the mandrel and the coiled layers already formed.
  • the fed web of fibrous cement is wound on to the sizing roll or the mandrel, firmly pressed together with the previously formed coiled layers while being dewatered, and connected with them to form a hollow cylinder of fibrous cement which is uniformly homogeneous in all layers and also of compact structure in the two end portions.
  • the advantages of the method as proposed by the invention come into pl-ay best when the torque driving the sizing roll or the mandrel becomes larger with the growing wall thickness of the hollow fibrous cement cylinder under construction.
  • This ensures that the outer layers of web material are wound on the sizing roll or the mandrel in as tight and firm a manner as the inner layers so that the finished hollow cylinders of fibrous cement show no differences in structure and compactness.
  • the torques driving, on the on hand, the breast roll and the felt belt and, on the other hand, the sizing roll or the mandrel are adjusted to one another so that the force exerted on the mass of fibrous cement by the sizing roll or the mandrel is greater than the thrust with which the breast roll and the felt belt act on the fibrous cement material, then the fibres lying in the longitudinal direction of the web of fibrous cement and the individual coiled layers will be given an optionally adjustable initial tension. In this way, finished products are obtained that are distinguished by increased strength.
  • the method as proposed by the invention can be carried out in various ways.
  • One of the possibilities coming into question for practical operation consists in controlling the transmission of torque in dependence on the variation of speed of the sizing roll or the mandrel that occurs during the growing of the wall thickness of the hollow cylinder f fibrous cement under construction.
  • the sizing roll or the mandrel may be driven either by an electric motor or a hydraulic motor and the driving ⁇ power may be transmitted by a Cardan shaft, a flexible shaft, a V-belt drive or a similar transmission with or without interposition of a mechanical or magnetic clutch.
  • an electric motor the current consumption of which adjusts itself automatically in accordance with the rising torque with the aid of a tacho-generator connected to the shaft of the breast roll or of the driving motor of the breast roll.
  • the electric driving motor may also be controlled, for example, by means of a camshaft connected with the shaft of the sizing roll or the mandrel through a disengageable clutch.
  • regulating means serving to inuence the hydraulic fluid circuit of the hydraulic motor may be controlled either also in dependence on the speed of the shaft of the sizing roll or the mandrel e.g. by means of a centrifugal governor, a camshaft or the like, or in dependence on the lifting motion of swinging arms supporting the sizing roll or the mandrel.
  • a direct control of the regulating means in the hydraulic liuid circuit of the hydraulic motor by means of a time switch may be provided.
  • FIG. l is a schematic side elevational view of the details of a sheet producing machine with an electric motor drive for the sizing roll that are necessary for the understanding of the invention
  • FIG. ,2 is a circuit diagram of the self-regulating electric motor drive for the sizing roll
  • FIGS. 3 and 4 are a schematic side elevational view and a schematic front elevational view, respectively, of the sizing roll and the breast roll, showing a hydraulic drive for the sizing roll;
  • FIG. 5 is a schematic side elevational view showing the control of the hydraulic drive for the sizing roll with the aid of a centrifugal governor;
  • FIG. 6 is a layout diagram of the hydraulic drive of FIG. 5;
  • FIG. 7 is a schematic side elevational view showing the control of the hydraulic drive for the sizing roll in dependence on the lifting motion of the swinging arms supporting the sizing roll;
  • FIG. 8 is a layout diagram of the hydraulic drive of FIG. 7, and
  • FIG. 9 is a schematic side elevational view showing the control of the hydraulic drive by a time switch.
  • FIG. 1 shows a sheet producing machine which comprises, as is customary, a winding or sizing roll 1 having a shaft 2 rotatably mounted in bearings 5 on two supporting arms 4 vertically swingable about fixed fulcrums of a frame 3, and a breast roll 6 having a shaft 7 mounted in bearings of the frame 3 so as to be rotatable but immovable in height.
  • the vertically movable sizing roll 1 bears against the breast roll 6 which is provided with a smaller diameter, and in addition to the force exerted by its dead weight it is rmly pressed against the breast roll 6 by an external force.
  • two hydraulically or pneumatically operated working cylinders 9 vare provided which are pivoted to arms 3a of the frame 3 and have piston rods 10 hingedly connected to the ends of the double lever-type supporting arms 4 remote from the sizing roll 1.
  • the additional contact pressure of the sizing roll 1 can be optionally adjusted according to requirements by varying the pressure uid supply to the working cylinders 9.
  • a web of fibrous cement can be conveyed to the sizing roll 1 by means of a conveniently -driven endless felt belt 11 arranged to travel in a known manner over one or more containers (not shown) in which sieve drums and couch-rolls are disposed for applying a plastic mass of fibrous cement on to the downwardly directed side of the lower run of the endless felt belt 11, couching the applied mass and precompressing it.
  • the upper run of the felt belt 11 is arranged to pass over a suction box 12 serving to suck part of the moisture out of the web of brous cement.
  • the felt belt 11 On the downstream side of the suction box 12 the felt belt 11 is advanced to the sizing roll 1 over guide rollers 13 and then passed through between the sizing roll 1 and the breast roll 6.
  • the felt belt transfers the web of ibrous cement, which is positioned on its upper side, to the sizing roll 1 on which a hollow cylinder 8 of fibrous cement is formed of the individual coiled layers of web material.
  • the felt belt 11 is passed on over the breast roll 6 and after having been passed round a return roller 14 it is guided over a cleaning device which may comprise, for example, felt beaters 15 and spray nozzles, and in a clean state it is passed over a plurality of guide rollers 16 to reach again the sieve cylinders from which it can then take up again wet mass of fibrous cement.
  • a cleaning device which may comprise, for example, felt beaters 15 and spray nozzles
  • the breast roll 6 is driven by a variable electric motor mounted on a bracket and having a reduction gearing 81.
  • a belt 82 transmits driving power to the shaft 7 of breast roll 6.
  • the speed of the driving motor and thus the peripheral speed of the breast roll can be adjusted in accordance with the kind of ibrous cement material to be processed and with the kind of the products to be manufactored.
  • the driving motor 80 of the breast roll 6 drives through a belt 17a tacho-generator 18 capable of generating a constant alternating voltage corresponding to the constant motor speed.
  • the alternating voltage of the tacho-generaor 18 can be transformed into a direct voltage by a rectifier 19 (FIG. 2).
  • the direct voltage which is proportional to the speed of the driving motor 80 is used for energizing a generator 20, the armature voltage of the generator 20 being proportional to the speed of the electric motor 80 which drives the breast roll 6 and the tacho-generator 18 and regulable by means of a regulating resistance 21.
  • the actual number of revolutions per minute of the breast roll 6 can be read on a voltmeter 22 calibrated as a speed indicator and is accurately adjustable by means of a regulating resistance 23 to the speed given in each case by the breast roll 6.
  • the sizing roll 1 is driven by a D.C. motor 24 which can be energized by the voltage generated by the generator 20.
  • a driving motor 25 is connected to a power supply system lwhich feeds also the driving ymotor 80 of the breast roll 6.
  • a rectier 26 having a regulating resistance 27 is connected to the power supply system to produce a direct voltage of, for example, volts which serves for exciting the eld voltage of the D.C. motor 24, also in this case a regulating resistance 28 being connected in the lead.
  • the power transmission from the driving motor 24 to the sizing roll 1 is dependent on the speed of the driving motor 80 for the breast roll and of the tacho-generator 18 connected to said motor 80.
  • the outer diameter of the sizing roll 1 which results from the jacket diameter of the sizing roll 1 and from the coiled layers applied thereto, grows with each revolution. Since the sizing roll 1 is not to vary its peripheral speed, the speed of the electric motor 24 driving the sizing roll will have to slightly decrease with each revolution.
  • the D.C. motor 24 is not capable of varying its speed by itself. The decrease of speed is brought about by the fact that the sizing roll 1 or the coiled layers already applied thereto is or respectively are in frictional engagement with the web of fibrous cement which is fed by the felt belt 11, so that, consequently, the peripheral speed of the sizing roll 1 must be the same as that of the breast roll 6.
  • the D.C. motor 24 Due to the decrease of the speed of the D.C. motor 214 driving the sizing roll 1, the counter-electromotive force in the D.C. motor 24 decreases whereas the current consumption through the armature of the D.C. motor increases accordingly. With the increased power consumption, which is controlled by the voltage of the tacho-generator 18 and by the mode of operation of the generator 20, the D.C. motor 24 produces an increasingly augmenting torque as is required for winding the outer layers of web material as tightly and firmly on the sizing roll 1 as the inner layers.
  • the D.C. motor 24 is arranged on a plate-like support member 29 secured to one of the vertically movable supporting arms 4 for the sizing roll 1.
  • the D.C. motor 24 drives a worm gear comprising a worm 31 and a worm yWheel 32 through a V-belt drive 30.
  • the worm 31 and the worm wheel 32 are enclosed in .a gear housing 33 which is likewise arranged on the plate-like support member 29. From a V-belt pulley 34 seated on a common shaft with the worm wheel 32, the torque is transmitted to the sizing roll 1 through an endless V belt 35 and a V-belt pulley 36 seated on the shaft 2 of the sizing roll 1.
  • the sizing roll 1 is driven by a hydraulic motor 37 which drives the shaft 2 of the sizing roll 1 through a reduction gearing 38.
  • Pressure fluid is supplied to the hydraulic motor 37 through a conduit 39 and returns to a pressure oil tank through a conduit 40.
  • FIG. 6 The layout diagram of the pressure oil circuit is apparent from FIG. 6 and :will be explained in detail hereinafter.
  • a worm wheel 41 is mounted on the shaft 2 of the sizing roll 1 and drives a spindle 43 through a worm 42. Hinged to the spindle 43 are centrifugal weights 44 the deflection of which is transmitted to a stop arm 46 through a rotatable ring 45.
  • the stop .arm 46 is displaceably guided on the spindle 43 by means of a guide sleeve 47 and serves as control element for a feeler lever 49 of a pressure-regulating valve 50, which lever is provided with a sliding roller 48.
  • a spring 51 of the pressure-regulating valve 50 causes the sliding roller 48 of the feeler lever 49 to bear against the stop arm 46.
  • the speed of the sizing roll 1 decreases whereby the centrifugal weights 44 come down and thus actuate the pressure-regulating valve 50 through the stop arm 46.
  • An electric motor 52 drives an axial piston pump S3 of known construction which is provided with an swingable part 54 for adjusting the stroke volume. Adjustment of the swingable part 54 is effected by means of a pressure regulator 55 which is operatively connected with the pressure-regulating valve 50.
  • the pump 53 is arranged to deliver pressure oil through the feed conduit 39 to the hydraulic motor 37 which is thereby put into rotation. The oil issuing again from the hydraulic motor 37 through the conduit 40 is returned .to the tank 58 via a preloading valve 56 vand a filter 57.
  • the preloading valve 56 has the function of generating a small counter pressure in the hydraulic motor 37 to attain smooth running.
  • the oil stream delivered by the pump 53 flows directly off to the tank 58 through a pressure relief valve 59.
  • an adjusting piston of the pressure-regulating valve 50 clears a cross-sectional area of the valve and permits a Small oil stream to arrive at a spring-loaded adjusting piston a of the pressure regulator 55. If the volume of this oil stream is smaller than the passage through a by-pass throttle 60, then no adjustment of the stroke volume of the axial piston pump 53 is effected so that the driving speed of the hydraulic motor 37 is not varied.
  • the pressure in the conduit 39 to the hydraulic motor 37 would also drop.
  • the adjusting piston of the pressure-regulating valve 50 then moves into the shutoff position and there flows no more pressure oil to the adjusting piston 55a of the pressure regulator 55.
  • the spring 55b of the pressure regulator 55 can thus restore the adjusting piston 55a into the position in which the pressure oil is led off through the by-pass throttle 60. In this manner the swingable part 54 of the pressure oil pump 53 is swung out again to allow increased delivery of the pump.
  • the control of the regulating means disposed in the pressure oil circuit is derived from the lifting movement of the supporting arms 4 for ythe sizing roll 1.
  • a cam rail 62 which is engaged by the sliding roller 48 of the feeler lever 49 of the pressure-regulating valve 50 is secured to the end of one of the two supporting arms 4 remote from the sizing roll 1.
  • the cam rail 62 is moved downwardly thereby to operate the feeler lever 49 of the pressure-regulating valve 50.
  • the same control operations are caused to take place in the pressure oil circuit as they have been described in detail when explaining the layout diagram of FIG. 6.
  • FIG. 9 shows an exemplified embodiment for the direct control of the regulating means of the pressure fluid circuit by means of a time switch such as an electrically operated clock which is accommodated in a common housing 63 with an interlocking contactor and a timedelay relay.
  • the layout of the oil circuit and the associated regulating means are substantially the same as in FIGS. 6 and 8.
  • the only difference of the arrangement according to FIG. 9 consists in that a two-way valve 64 and a control pump 65 with an electric driving motor 66 are connected in the pressure oil system instead of the by-pass throttle 60 and the pressure-regulating valve 50, respectively.
  • the electric driving motor 52 for the piston pump 53 of variable stroke volume and the electric driving motor 66 of the control pump 65 can be switched on simultaneously by means of a master contactor controller.
  • cam rail 67 is secured which is arranged to operate a limit switch 68 when the finished sheet of brous cement runs off the sizing roll 1 and when the sizing roll 1 goes down toward the breast roll 6.
  • the limit switch 68 sets going the clock and simultaneously actuates the interlocking contactor which closes the two-way valve 64.
  • the control pump 63 now delivers a small constant quantity of oil to the pressure regulator 55 which corresponds with regard to construction and operation to the pressure regulator 55 of the arrangement according to FIG. 6.
  • the piston 55a of the pressure regulator 55 moving upwardly against the action of the preloaded spring SSb adjusts the swingable part 54 of the piston pump 53 of variable stroke volume so that the pump feeds pressure oil to the hydraulic motor 37 and transmits through the reduction gearing 38 a torque with an appropriate number of revolutions to the sizing roll 1.
  • the control pump 65 is acting during the whole operating time of the time switch with an increasingly augmenting pressure on the piston 55a of the pressure regulator 55, the driving torque generated in the hydraulic motor 37 becomes increasingly greater.
  • Switching off the time switch is effected by a microswitch 69 incorporated in a device 70 for measuring the wall thickness of the hollow cylinder of fiborus cement being under construction on the sizing roll 1.
  • the device for measuring the thickness operates in a known manner by means of a feeler roller adapted to travel along the surface of the hollow cylinder of fiborus cement.
  • the microswitch 69 When upon reaching the real size of the hollow cylinder of fibrous cement the microswitch 69 is operated and switches off the time switch, the interlocking contactor is actuated which causes the impulse for severing the finished hollow cylinder of fibrous cement to be generated.
  • the two-way valve 64 is moved by the interlocking contactor into the open position in which the oil is displaced from t-he valve housing and forced back into the tank 58 by the spring 55h of the pressure regulator 55.
  • the three-way valve 61 incorporated in the pressure oil circuit which is not shown in FIG. 9, is also operated so that the oil supply to the hydraulic motor 37 is interrupted and the oil is caused to flow off into the tank 58.
  • the time switch After having been switched off, the time switch returns automatically into the zero psition. Switching it on again is effected by the limit switch 68.
  • An apparatus for manufacturing plastic, fibrous cement sheets and tubes comprising:
  • said endless belt carrying a web of a mass of plastic, fibrous cement and feeding layers of said web j to form a wall of said mass onto said winding roll whereby said wall has an increasing thickness as the wall is formed
  • said second driving means including a control means for varying the said driving power as a function of said increasing thickness to thereby control said peripheral speed of said winding roll.
  • Apparatus for manufacturing plastic, fibrous cement sheets and tubes comprising:
  • said endless belt carrying a web of a mass of plastic, fibrous cement and feeding layers of said web to form a wall of said mass onto said winding roll whereby said wall has an increasing thickness as the wall is formed
  • said second driving .means including a control means for varying said driving power
  • control means including a means for monitoring said increasing thickness of said wall
  • control means further including a means responsive to said monitoring means for varying the said driving power as a function of said increasing thickness to thereby control the amount of shear forces to which the said wall is subjected.
  • said tacho-generator means controlling the power consumption responsive to an increasing torque load resulting from the said increasing thickness.
  • said second driving means comprises a hydraulic motor, gear means connecting said motor to said winding roll and a pressure fluid circuit means providing a flow of fluid to said hydraulic motor, and
  • control means regulates the flow of fiuid within said pressure fiuid circuit means to control the driving power of said hydraulic motor.
  • said means for monitoring includes a feeler roller engaging said winding roll, said roller activates said control means in response to the increasing wall thickness
  • said second driving means comprises a hydraulic motor, gear means connecting motor to said winding roll and a pressure fiuid circuit means providing a flow of fiuid to said hydraulic motor, and
  • control means regulates the flow of fluid within said pressure fluid circuit means to control the driving power of said hydraulic motor.
  • said second driving means comprises a hydraulic motor, gear means connecting motor to said winding roll and a circuit means providing a pressure fluid supply to said hydraulic motor,
  • control means regulates the supply of fluid within said pressure fiuid circuit means to control the driving power of said hydraulic motor
  • control means having a time switch, and further including means responsive to said time switch for shutting off said supply when said monitoring means has indicated the desired thickness of said wall has been reached and said hollow cylinder has been removed.
  • control means including a generator means for generating the armature voltage of said direct current motor, and
  • control means further including means for connecting said tacho-generator means for generating the field voltage for said generator.
  • said second driving means includes a reduction gearing means and means for connecting said gearing means in series with said direct current motor and said winding roll.
  • control means includes a pressure-regulating valve for controlling said ow of uid, a feeler lever for activating said valve, a centrifugal governor, and a vertically movable stop arm interposed between said centrifugal governor and contacting said feeler lever for activating said valve,
  • said centrifugal governor being responsive to said shaft of said winding roll and activating said pressureregulating valve by way of the said stop arm.
  • An apparatus as defined in claim 5 including a pair of vertically movable swinging arms which support said winding roll,
  • control means further includes a cam rail and a pressure-regulating valve for controlling the flow of fluid and a feeler lever,
  • cam rail being located on one of said swinging arms and in contact with said feeler lever
  • said feeler lever being mounted within said pressureregulating valve
  • control means comprises a control pump located in said pressure fluid circuit means, an electric motor for driving said control pump, a means connecting said time switch to said electric motor,
  • piston pump having a variable stroke volume
  • said piston pump located in said pressure fuid circuit means and acting on a pressure regulator having an adjusting piston means for acting on said piston pump
  • control pump delivering pressure oil to move said adjusting piston means until said time switch stops powerY to said electric motor for driving said control pump.
  • An apparatus as defined in claim 11 including a pair of supporting arms mounted on a frame and supporting said winding roll,
  • said means for monitoring includes a microswitch for disconnecting said time switch operably in contact with said wall having an increasing thickness.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Moulding By Coating Moulds (AREA)
US433760A 1964-02-19 1965-02-18 Devices for producing sheets and tubes of fibrous cement or the like by winding a web of plastic mass of fibrous cement on to a sizing roll or a mandrel Expired - Lifetime US3413191A (en)

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Application Number Priority Date Filing Date Title
DEO0009958 1964-02-19

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US3413191A true US3413191A (en) 1968-11-26

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US (1) US3413191A (de)
AT (1) AT248935B (de)
BE (1) BE659728A (de)
CH (1) CH438132A (de)
DK (1) DK121648B (de)
FR (1) FR1428098A (de)
GB (1) GB1102063A (de)
NL (1) NL6502020A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2507950A1 (fr) * 1981-06-12 1982-12-24 Sp K Bjur Machine pour le formage de produits en materiaux fibreux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9002759A (pt) * 1989-06-12 1991-08-20 De Beers Ind Diamond Metodo e aparelho de separar material de minerio particulado

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121659A (en) * 1959-07-09 1964-02-18 Amanzio Adalberto Apparatus for producing fiber reinforced cementitious structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121659A (en) * 1959-07-09 1964-02-18 Amanzio Adalberto Apparatus for producing fiber reinforced cementitious structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2507950A1 (fr) * 1981-06-12 1982-12-24 Sp K Bjur Machine pour le formage de produits en materiaux fibreux

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GB1102063A (en) 1968-02-07
BE659728A (de) 1965-05-28
AT248935B (de) 1966-08-25
NL6502020A (de) 1965-08-20
CH438132A (de) 1967-06-15
FR1428098A (fr) 1966-02-11
DK121648B (da) 1971-11-08

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