EP0003704B1 - Procédé et dispositif de mélange en continu de solides pulvérulents et de liquides, notamment du plâtre et de l'eau - Google Patents

Procédé et dispositif de mélange en continu de solides pulvérulents et de liquides, notamment du plâtre et de l'eau Download PDF

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Publication number
EP0003704B1
EP0003704B1 EP79400077A EP79400077A EP0003704B1 EP 0003704 B1 EP0003704 B1 EP 0003704B1 EP 79400077 A EP79400077 A EP 79400077A EP 79400077 A EP79400077 A EP 79400077A EP 0003704 B1 EP0003704 B1 EP 0003704B1
Authority
EP
European Patent Office
Prior art keywords
vat
mixing
mixer
turbine
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79400077A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0003704A1 (fr
Inventor
Adrien Delcoigne
Jacques Lanneau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Industries SA
Original Assignee
Saint Gobain Industries SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saint Gobain Industries SA filed Critical Saint Gobain Industries SA
Publication of EP0003704A1 publication Critical patent/EP0003704A1/fr
Application granted granted Critical
Publication of EP0003704B1 publication Critical patent/EP0003704B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/51—Methods thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/59—Mixing systems, i.e. flow charts or diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2218—Weight of at least one component to be mixed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices

Definitions

  • the present invention relates to the mixture of pulverulent solids and liquids and it finds an application in the preparation of hydraulic binders and in particular in the continuous preparation of a mixture of plaster and water.
  • mixers of the type of coulter or paddle mixers formed of a cylindrical tank in which rotates a vertical shaft provided with one or more levels of radial arms terminated by blades and / or plowshares.
  • the blades or the coulters scrape the walls of the tank, turn the products over and thus carry out a stirring.
  • mixers do not ensure sufficient dispersion of the pulverulent solid in the liquid, hence a heterogeneity of the fluidity of the outgoing mixture.
  • turbine mixers are known which consist of a tank in which rotates at very high speed. a disc, a propeller or a turbine.
  • turbine mixers achieve a high shear rate and intensive turbulence at all points in the system, so that the dispersion and homogenization of the products are satisfactory.
  • the present invention overcomes the drawbacks of each of the known embodiments; it makes it possible to continuously supply a mixture of powdery solids and liquids with regular fluidity.
  • this invention prevents any parasitic deposition inside the mixer and, consequently, when working with evolutionary products, eliminates any premature build-up inside said mixer, a fluid evolutionary product being a liquid in which takes place a certain reaction giving rise to a physical or chemical transformation, capable in particular of causing a solid phase to appear or of modifying the characteristics of the solid phase initially charging the liquid.
  • a fluid evolutionary product being a liquid in which takes place a certain reaction giving rise to a physical or chemical transformation, capable in particular of causing a solid phase to appear or of modifying the characteristics of the solid phase initially charging the liquid.
  • the liquid is introduced along the wall of the mixer so as to form there a continuous curtain of liquid which prevents parasitic deposits.
  • the mixed product is extracted through the bottom of the mixer so as to avoid any retention of solid in the tank of said mixer.
  • the filling state of the mixing tank determines the average residence time of the products to be mixed in the mixing tank and said average residence time is at least 3 seconds and preferably between 15 and 30 seconds.
  • the invention also proposes an application of the method to the continuous mixing of plaster and water.
  • FIG. 1 represents a mixer M of pulverulent products and of liquids, according to the invention. It consists of a vertical cylindrical tank 1 which narrows in its lower part 2 to converge towards a discharge orifice 2 '. A deflocculating turbine 3 is mounted inside the tank 1 on a vertical shaft 4 arranged along the axis of the tank and driven by a motor 5. An intermediate bottom 6 of the tank 1 is constituted by the upper surface of a core 7 forming an obstacle inside the converging lower part 2 of the tank 1. This obstacle is a solid of revolution whose shape converges downwards.
  • the core 7 is a cone arranged point downwards at the 'interior of the narrowed lower part 2, itself conical, of the tank, the intermediate bottom then being constituted by the flat base of said cone. As shown in FIG. 3, the cone 7 is held inside the lower part 2 of the tank 1 by fixing lugs 7A.
  • the lower part 2 of the mixer opens into an ejection device 8 in the form of an inverted cyclone, that is to say for example constituted by a conical envelope 9 arranged point at the top, with a flat base 10 and a collection pipe. 11 leaving flush with the base 10, tangentially to the conical casing 9 in the direction of rotation of the turbine 3.
  • This collection pipe 11 extends vertically and is provided with a valve 12 for adjusting the flow rate which delivers the mixture by a pipe 13 to the installations for using the mixture.
  • This valve 12 will be a pneumatic valve with direct passage constituted by an elastic sleeve enclosed in a rigid housing, controlled by a fluid sent under pressure between the housing and the elastic sleeve.
  • the upper edge of the tank 1 is provided with a covered annular weir 14, supplied with liquid by a flexible pipe 15.
  • a bypass 16 connected to the flexible pipe 15 and equipped with an adjustment valve 17 takes part of the liquid and directs it on the shaft 4 of the turbine 3.
  • FIG. 2 shows a complete mixing installation.
  • the mixer M with its tank 1, its core 7 forming an obstacle inside the converging part 2 of the tank, its intermediate bottom 6 formed by the upper surface of the core 7, its annular flow orifice at the periphery the intermediate bottom 6, its ejection device 8 in the form of an inverted cycone, the collecting pipe 11 extended vertically and provided with the valve 12 for adjusting the flow rate of the outgoing mixture, the supply of liquid with the weir 14 and the bypass 16, the turbine 3 driven by the motor 5.
  • This FIG. 2 gives an example of a device S for supplying powdered solid and a device L for supplying liquid, from the mixer M.
  • the device S for supplying solid proposed here comprises a hopper 18 disposed above a conveyor belt 19 forming a balance, balanced on a knife shown diagrammatically at 20 when it is loaded with a determined weight of product.
  • a device is said to be a constant weight carpet.
  • This balance carpet 19 is associated with a hatch 21 for adjusting the thickness of the layer of product delivered by the hopper 18.
  • a vibrating metal corridor 22 provided with a sieve is arranged below the end of the carpet. balance 19.
  • This corridor 22 is inclined with respect to the horizontal by an angle which depends on the pulverulent product and which, in the case of plaster, will be of the order of 45 degrees.
  • This corridor 22 is arranged so that its lowest end overhangs the tank 1 of the mixer M and the pulverulent solid which it delivers falls in the center of the tank 1 on the turbine 3.
  • the liquid supply device L of this FIG. 2 the liquid supply is made from a reservoir 23 at constant level; the liquid flow is adjusted by a valve 24, a flow indicator 25 allows precise control of said flow.
  • Eo and Po being respectively the mass flow of water and the mass flow of plaster.
  • a ratio of 0.8 will be conventionally used.
  • the material flow rates are first set.
  • the water flow rate is adjusted by the valve 24 to the desired Eo value.
  • the plaster flow is then adjusted to the value Po: the plaster contained in the hopper 18 spreads on the constant weight balance carpet 19 adjusted in equilibrium on the knife 20 for a determined weight of product, then the flow Po is obtained by adjusting the running speed of the weighing belt 19.
  • a residence time To of the plaster mixed in the mixer tank is chosen.
  • the turbine 3 is rotated.
  • the mixer tank is closed by obstruction of the pipe 13 or by closing the valve 12.
  • the device L for supplying liquid, adjusted to provide a flow rate Eo is open for the time To chosen. Water is introduced on the one hand by the weir 14, on the other hand by the pipe 16.
  • the turbine 3 rotating at high speed creates agitation of the water.
  • the plaster supply device S adjusted for a flow rate Po, is put into operation for a time To.
  • the plaster supply is cut off.
  • the turbine 3 is allowed to mix the water and the plaster for a time of the order of To / 2 counted from the plaster supply cut-off. Then, after this mixing time To / 2, simultaneously, the water supply is always set for a flow rate Eo, the supply is always set for a flow rate Po, the mixture contained in the tank is allowed to flow of the mixer by opening the pipe 13 or by opening the valve 12 for adjusting the discharge rate of the mixture and by adjusting said valve 12 so that the quantity of product in the mixer remains constant and equal to the quantity present in the tank during starting during the mixing phase. The steady state is thus quickly reached.
  • the water and plaster supply is continuous with respective flow rates Eo and Po, the mixing is permanent, a constant quantity of mixture remains in the mixer tank, the average residence time of the mixture in the mixer is constant and equal to To chosen at start-up, the flow of the mixture is also done continuously with a flow rate (Eo + Po).
  • the water introduced into the annular spillway 14 is distributed uniformly over its entire periphery and by overflow trickles along the inner wall of the tank 1.
  • the water withdrawn by the pipe 16, metered by the valve 17 performs a sprinkling of the 'shaft 4 of the turbine 3.
  • the plaster contained in the hopper 18 spreads on the constant weight balance carpet 19 in equilibrium on the knife 20.
  • the balance carpet being adjusted for a flow Po, any overfeeding or underfeeding momentary plaster causes an imbalance which results in a change in position of the hatch 21 for adjusting the thickness of the plaster layer, a change which tends to restore balance.
  • the plaster falls on the sieve covering the vibrating metal corridor 22, the clusters break and the finely divided plaster flows in said metal corridor. This by its vibrations, spreads in the time the excesses and defects in the plaster supply, due to the landslide process; then it concentrates the plaster in a vein and causes the said vein to fall onto the turbine 3 which rotates at high speed inside the tank 1 of the mixer.
  • the curtain of water formed on the wall of the tank 1 and the excess water created on the shaft of the turbine prevent any deposit of powdered plaster and any undesirable primer of solidification on the wall of the tank 1 and on the tree 4.
  • the turbine 3 rotating at high speed rotates the products contained in the tank.
  • the speed of the turbine is determined so that a stable vortex with a vertical axis is formed, that is to say a single hollow vortex lining the walls of the tank internally.
  • the surface of the mixture then takes a conical shape centered on the shaft 4 of the turbine 3.
  • the depth of the vortex depends on the geometry of the tank of the mixer M and on the speed of rotation of the turbine which is adjusted so that the bottom of the vortex touches said turbine 3. This optimal speed depends on the fluidity of the mixture, which is a function of the ratio and To.
  • the powdery plaster delivered by the vibrating metal corridor 22 falls in the center of the vortex on the turbine 3 rotating at high speed.
  • the rotation of the products ensures homogenization, and the inclination of the surface of the liquid avoids the stagnation of solid products in clusters.
  • the intermediate bottom 6 of the mixer M constituted by the upper surface of the core 7 matching the flow figures of the turbine 3, that is to say the circulation lines of the mixing zone, and being for example flat and arranged in the immediate vicinity of the turbine, no deposit forms there.
  • the plaster / water mixture is extracted regularly in the annular space located between the obstacle-core 7 and the converging wall of the lower part 2 of the mixer.
  • the position of this core 7 with respect to the converging wall of the lower part 2 of the mixer defines the dimensions of this annular space and thus determines a certain limit flow rate.
  • the mixture flows in this space with a sufficient speed which does not allow solidification.
  • the speed of the plaster mixture measured along the generatrix of the cone core 7 will be at least 30 cm / second and generally around 1 m / second.
  • the sections of the mixture extraction pipes located downstream will also be chosen so that this minimum speed is reached, thus avoiding deposits and premature caking.
  • the mixture converges at the tip 2 'of the lower part 2 of the mixer.
  • the mixture still in rotational circulation enters the ejection device 8 in the form of an inverted cyclone.
  • the mixture remains pressed along the conical walls of the ejection device 8 and descends along these walls to the base 10 of the device in a spiral. In this way, an uncontrolled vortex does not form, which can give rise to a dead zone where there is a risk of solidification.
  • the mixture in rotational circulation is then captured by the collection pipe 11 and it then gives a full cylindrical stream whose flow will now be able to be adjusted precisely by the throttling valve located at the end of said collection pipe 11 .
  • the passage section of this valve 22 is constantly adjusted to maintain a constant quantity of mixture in the tank. of the mixer and thereby a constant residence time of said mixture in said mixer. This residence time allows the homogenization of the mixture and the elimination of feed irregularities.
  • valve 12 can be obtained in various ways. It could be regular, but in the case of plaster, taking into account the rapid process of evolution of powdered plaster as soon as it is in contact with water, if one wants to have a mixture with constant fluidity, having so stayed a specific time in the mixer, it will be automatic.
  • the regulation signal sent to valve 12 will be provided by a photoelectric cell reacting as soon as the mixture in the mixer tank has reached a certain level, or by a capacitive system measuring the electrical capacity of a determined height of the mixture, or by a pressure probe placed at the bottom of the tank, or even preferentially by weighing the mixer.
  • the valve 12 will be a direct passage valve constituted by a rigid body, by an elastic inner sleeve and by a fluid supply between the rigid body and the sleeve, said fluid being capable of compressing the elastic sleeve to reduce the flow rate of the valve. .
  • a modulation of the fluid pressure controlling the opening of valve 12 is produced, modulation which causes the sleeve to constantly deform.
  • the sleeve will be made of an elastic, flexible impermeable material, such as air chamber rubber, and at rest it will have substantially the same dimensions as the interior of the rigid body which envelops it.
  • the valve 12 will be controlled using a pneumatic leakage control system varying the opening of said valve 12 as a function of the weight of the mixer and we will take advantage of the system's oscillations induced by the vibrations due to the movement of the mixture and the turbine in the mixer tank to modulate the pressure of the control fluid. More specifically in this case the mixer will be separated from the upstream and downstream installations to make weighing possible.
  • a pneumatic leak system mainly comprises a pneumatic circuit and a force balance beam.
  • the pneumatic circuit is supplied with a constant flow of compressed air; it has two branches, one going to the valve 12, the other opening into the open air near one end of the balance beam and thus determining a certain leak, variable when the beam oscillates.
  • the balance beam weighs constantly on the mixer.
  • the ejection device can be constituted by any conventional means in fluid mechanics, capable of transforming any flow, in particular a rotary flow, into a full vein.
  • an impact crown 26 formed by a pot with a bottom and a side ejection tube.
  • the time To must always remain lower than a value Tp corresponding to the time of start of setting of the mixture.
  • Supply flows Po and Eo and therefore the discharge flow (Po + Ep) being determined, this average retention time To is determined by the filling state of the mixing tank and it is by the maintenance of this filling state that the average retention time is kept constant.
  • the average retention time will be at least equal to three seconds and preferably between 15 and 30 seconds so that sufficient homogenization of the solid and liquid products is obtained.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)
  • Detergent Compositions (AREA)
EP79400077A 1978-02-08 1979-02-06 Procédé et dispositif de mélange en continu de solides pulvérulents et de liquides, notamment du plâtre et de l'eau Expired EP0003704B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7803474A FR2416717A1 (fr) 1978-02-08 1978-02-08 Melangeage en continu de solides pulverulents et de liquides
FR7803474 1978-02-08

Publications (2)

Publication Number Publication Date
EP0003704A1 EP0003704A1 (fr) 1979-08-22
EP0003704B1 true EP0003704B1 (fr) 1982-10-20

Family

ID=9204331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400077A Expired EP0003704B1 (fr) 1978-02-08 1979-02-06 Procédé et dispositif de mélange en continu de solides pulvérulents et de liquides, notamment du plâtre et de l'eau

Country Status (21)

Country Link
EP (1) EP0003704B1 (no)
JP (1) JPS54117972A (no)
AR (1) AR220370A1 (no)
AT (1) ATA95679A (no)
AU (1) AU537609B2 (no)
BR (1) BR7900754A (no)
CA (1) CA1121804A (no)
DE (1) DE2963867D1 (no)
DK (1) DK45979A (no)
ES (1) ES477528A1 (no)
FI (1) FI63535C (no)
FR (1) FR2416717A1 (no)
GR (1) GR71690B (no)
IE (1) IE48227B1 (no)
IN (1) IN150658B (no)
NO (1) NO149683C (no)
NZ (1) NZ189601A (no)
PL (1) PL124781B1 (no)
PT (1) PT69198A (no)
TR (1) TR20998A (no)
ZA (1) ZA79519B (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8038915B2 (en) 2006-11-01 2011-10-18 United States Gypsum Company Panel smoothing process and apparatus for forming a smooth continuous surface on fiber-reinforced structural cement panels

Families Citing this family (14)

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LU81524A1 (de) * 1979-07-17 1981-02-03 Arbed Verfahren zum herstellen von kolloidmoertel und gemaess diesem verfahren gewonnenes produkt
SE420050B (sv) * 1980-01-15 1981-09-14 Alfa Laval Ab Anordning for att vega pulver och vetska blanda pulvret i vetskan
AU594443B2 (en) * 1986-03-21 1990-03-08 Kevin John Charles West Apparatus for mixing and feeding fluid to be applied to particulate material
GB9310364D0 (en) * 1993-05-18 1993-07-14 Explosive Dev Ltd Mixing arrangements
US5452954A (en) * 1993-06-04 1995-09-26 Halliburton Company Control method for a multi-component slurrying process
US7754052B2 (en) 2006-11-01 2010-07-13 United States Gypsum Company Process and apparatus for feeding cementitious slurry for fiber-reinforced structural cement panels
US7513963B2 (en) * 2006-11-01 2009-04-07 United States Gypsum Company Method for wet mixing cementitious slurry for fiber-reinforced structural cement panels
WO2012028291A1 (en) * 2010-09-01 2012-03-08 Cargill, Incorporated Apparatus and method for mixing a powder with a liquid
MD363Z (en) * 2010-10-21 2011-11-30 Inst Tehnica Agricola Mecagro Device for dispensing and mixing liquids
BR112015012984B8 (pt) * 2012-12-05 2020-07-14 Yoshino Gypsum Co dispositivo de mistura e agitação para pasta de gesso, método para misturar e agitar pasta de gesso, e, método e aparelho para fabricar placas de gesso leves
CN108032437A (zh) * 2017-12-15 2018-05-15 中科纳达新材料（广西）有限公司 一种用于建筑施工的混凝土搅拌装置
CN111346794B (zh) * 2018-12-31 2022-04-05 重庆津竹缘创新科技有限公司 一种磁力搅拌翻转出胶的双组分配胶装置
JP7309841B2 (ja) * 2021-12-21 2023-07-18 千住金属工業株式会社 フラックス生成装置及びフラックス生成方法
CN115487722B (zh) * 2022-11-08 2024-05-03 山东蓝湾新材料有限公司 一种温敏延迟型堵水剂制备装置

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BE556314A (no) *
US1781255A (en) * 1929-04-24 1930-11-11 Independent Oil Well Cementing Cement mixer for cementing oil and gas wells
US2915412A (en) * 1957-03-15 1959-12-01 Georgia Kaolin Co Method of handling and conditioning paper making clay for use
US3222036A (en) * 1963-02-07 1965-12-07 Arvel O Franz Apparatus for preparation of solids in liquid dispersions
DE1571606A1 (de) * 1966-04-18 1970-07-23 Rudolf Kalich Verfahren und Vorrichtung zum Herstellen von Zementleim
US3967815A (en) * 1974-08-27 1976-07-06 Backus James H Dustless mixing apparatus and method for combining materials
HU172922B (hu) * 1975-02-05 1979-01-28 Melyepitesi Tervezo Vallalat Ustanovka dlja smehhenija tvjordykh, zernistykh i/ili poroshkoobraznykh materialov s vodoj pri izgotovlenii pul'py, transportiruemoj po truboprovodam

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8038915B2 (en) 2006-11-01 2011-10-18 United States Gypsum Company Panel smoothing process and apparatus for forming a smooth continuous surface on fiber-reinforced structural cement panels

Also Published As

Publication number Publication date
FI63535C (fi) 1983-07-11
NO149683B (no) 1984-02-27
JPS54117972A (en) 1979-09-13
AR220370A1 (es) 1980-10-31
ZA79519B (en) 1980-05-28
EP0003704A1 (fr) 1979-08-22
NO149683C (no) 1984-06-06
FI790410A (fi) 1979-08-09
PL124781B1 (en) 1983-02-28
AU4403279A (en) 1979-08-16
GR71690B (no) 1983-06-21
FI63535B (fi) 1983-03-31
NZ189601A (en) 1983-05-10
PL213285A1 (no) 1979-11-05
DK45979A (da) 1979-08-09
CA1121804A (en) 1982-04-13
NO790386L (no) 1979-08-09
IN150658B (no) 1982-11-20
PT69198A (en) 1979-03-01
BR7900754A (pt) 1979-08-28
AU537609B2 (en) 1984-07-05
IE48227B1 (en) 1984-11-14
TR20998A (tr) 1983-03-30
FR2416717B1 (no) 1982-03-19
IE790225L (en) 1979-08-08
ATA95679A (de) 1987-02-15
FR2416717A1 (fr) 1979-09-07
ES477528A1 (es) 1979-06-16
DE2963867D1 (en) 1982-11-25

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