FR2477947A1 - Direct feeding of differently constituted fibre-contg. suspensions - into separate depositing zones for asbestos cement structure prodn. - Google Patents

Direct feeding of differently constituted fibre-contg. suspensions - into separate depositing zones for asbestos cement structure prodn. Download PDF

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Publication number
FR2477947A1
FR2477947A1 FR8012368A FR8012368A FR2477947A1 FR 2477947 A1 FR2477947 A1 FR 2477947A1 FR 8012368 A FR8012368 A FR 8012368A FR 8012368 A FR8012368 A FR 8012368A FR 2477947 A1 FR2477947 A1 FR 2477947A1
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France
Prior art keywords
suspensions
contg
fibre
inflow
prodn
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Granted
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FR8012368A
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French (fr)
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FR2477947B1 (en
Inventor
Wolfgang Ortlepp
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ETERNIT FINANCIERE
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ETERNIT FINANCIERE
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/52Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/522Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement for producing multi-layered articles

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

The direct feeding of the suspensions for the prodn. of a multi-layered building material based on fibrous cement, takes place simultaneously in at least two wash depositing zones, sepd. from each other. The fibre-contg. suspensions may be of different or of similar consistency; a layer which assists filtration being produced in the first depositing zone. For pref. in the second depositing zone, and the,if any, following additional depositing zones, suspensions contg. fibre of a high consistency are delivered. At least one of the suspensions contains a binding agent, and the suspensions differ both as regards the fibrous material and the binding agent qualitatively and quantitatively. At least one suspension contains thermoplastic, organic, synthetic fibrous material, which, after the building material has set, is melted to give a layer protecting against corrosion. A binding agent which can be dispersed in water is added and is polymerised after the layer has set, to give protection against corrosion. To remedy the failings of the first feeding method, that the fibrous material is not distributed statistically satisfactorily, and that a great deal of material goes through the gauze. The invention gives a product with a multi-layered fleece structure and good mechanical characteristics, esp. resistance to bending, tension and impact.

Description

L'invention concerne un procédé et un appareil pour la fabrication d'un produit tiré de suspensions contenant des fibres par afflux de matière, en particulier pour la fabrication d'un matériau de construction stratifié a base de fibres-ciment. The invention relates to a method and an apparatus for the manufacture of a product obtained from suspensions containing fibers by influx of material, in particular for the manufacture of a laminated building material based on fiber cement.

Jusqu'ici, poL fabriquer des produits tirés de suspensions contentant des fibres, on utilisait le plus souvent des machines à afflux direct comportant une caisse d'afflux de atiere, mais aussi des machines à feutre court et long. Up to now, in order to manufacture products drawn from suspensions containing fibers, we have most often used direct inflow machines comprising an atflow inflow box, but also short and long felt machines.

Par rapport auYO machines a taxis cylindrique, les machines à afflux direct se distinguent surtout par une structure mécanique simple, une moindre sensibilité aux perturbations, d'où une moindre dépense d'enretien, et aussi par une plus glande universalité (quant à ltépaisseur de la couche de fibres et à la vitesse de production). Toutefois, la machine à afflux direct avec caisse d'afflux de matière présente certains inconvénients : les matières fibreuses traitées sont distribuées de façon relativement moins statistiques, la couche formée par l'afflux direct offre une structure homogene mais à une seule couche.En outre, étant donné qu'immediatement ou peu de temps apyres, la région de dépôt est dés- hydratez, la proportion de charge ou de liant qui passe a travers le feutre sans entre utilisée est beaucoup plus grande que dans une machine a plusieurs cylindres dans laquelle la nappe de fibres se compose d'un nombre de couches correspôndant au nombre des tamis cylindriques.Compared to the YO cylindrical taxi machines, direct inflow machines are distinguished above all by a simple mechanical structure, less sensitivity to disturbances, hence a lower maintenance cost, and also by a more universal aspect (as for the thickness of the fiber layer and at the production speed). However, the direct inflow machine with a material inflow box has certain disadvantages: the treated fibrous materials are distributed in a relatively less statistical manner, the layer formed by the direct influx offers a homogeneous structure but with a single layer. , since immediately or shortly after deposition, the deposition region is dehydrated, the proportion of filler or binder which passes through the felt without being used is much greater than in a machine with several cylinders in which the fiber layer is made up of a number of layers corresponding to the number of cylindrical screens.

Les inconvénients mentionnes du procédé à afflux direct engendrent une diminution nette de la résistance de la nappe ou, dans la fabrication du ma terian en fibres-ciment, de la matiere retirée du cylindre de format ou du mandrin du tuyau.  The aforementioned drawbacks of the direct inflow process cause a net decrease in the strength of the web or, in the manufacture of fiber cement material, of the material removed from the format cylinder or the pipe mandrel.

La présente invention a pour but d'indiquer un procédé du type défini plus haut qui améliore notablement le rendement de matière et qui permette de fabriquer un produit à plusieurs couches de bonnes propriétés mécaniques, en particulier une grande résistance à la tracticn en flexion et au choc. The object of the present invention is to indicate a process of the type defined above which appreciably improves the yield of material and which makes it possible to manufacture a product with several layers of good mechanical properties, in particular a high resistance to the tract in flexion and to shock.

Selon l'invention, ce problème est résolu comme indiqué dans la partie caractérisante de la revendication 1. According to the invention, this problem is solved as indicated in the characterizing part of claim 1.

L'organisation du procédé est indiquée, en outre, dans les sous-revendications 2 à 5. The organization of the process is further indicated in subclaims 2 to 5.

Pour la mise en oeuvre du procédé selon l'invention, on indique un appareil dont les caractéristiques figurent aux revendications 6 et 7. For the implementation of the method according to the invention, an apparatus is indicated, the characteristics of which appear in claims 6 and 7.

Les avantages obtenus grâce à l'invention résident essentiellement dans le fait que l'on peut fabriquer un matériau de construction stratifie, ayant des propriétés mécaniques avantageuses, en utilisant une machine à afflux direct.The advantages obtained thanks to the invention essentially lie in the fact that it is possible to manufacture a laminated building material, having advantageous mechanical properties, by using a direct inflow machine.

Cette machine offre ici la possibilité de traiter dans un même système des suspensions contenant des fibres et ayant une composition différente, le pouvoir de rétention et le rendement de matière tant notablement améliores par la formation d'une couche auxiliaire de filtration.This machine offers here the possibility of treating in the same system suspensions containing fibers and having a different composition, the retention power and the yield of material being significantly improved by the formation of an auxiliary filtration layer.

Un appareil d'afflux de matière convenant à la mise en oeuvre du procédé selon l'invention est présenté schématiquement à l'aide de la figure annexée, et décrit plus précisément ci-apres. A material inflow apparatus suitable for implementing the method according to the invention is presented diagrammatically using the appended figure, and described more precisely below.

L'appareil d'afflux de matière présente deux caisses d'afflux ou de dépit séparées 1 et 2 dont chacune est munie d'une entrée spéciale de matière 1a, 2a et d'une sortie spéciale de matière lb,2b. Les caisses ae dépôt 1 et 2 alimentent successivement un cté d'une bande de feutre tamis sans fin tournante 3 sur l'autre côté de laquelle sont prévus des dispositifs d'aspiration sous la forme de caisses d'aspiration 1c, 2c. La bande de feutre tamis dont le sens de marche est indiqué par une flèche, est guidée par des rouleaux de renvoi 4. The material inflow apparatus has two separate inflow or outflow boxes 1 and 2 each of which is provided with a special material inlet 1a, 2a and a special material outlet 1b, 2b. The deposit boxes 1 and 2 successively supply one side with a rotating endless sieve felt band 3 on the other side of which suction devices are provided in the form of suction boxes 1c, 2c. The sieve felt strip, the direction of travel of which is indicated by an arrow, is guided by idler rollers 4.

Dans l'exemple ci-apres, on présente la composition des suspensions de matière et la mise en oeuvre du procédé
Suspension I 1 pp (partie en poids) de fibres de polyéthylène coupées courtes 0 à 100 pp de ciment portland PZ35F 10 à 30 pp de dispersion de polyacrylate et 100 à 500 pp d'eau
Suspension Il 1 pp de mélange d'amiante 10 pp de ciment portland PZ35F 10 à 40 pp d'eau
On amène la suspension I a la caisse d'afflux de matière 1 et on alimente avec cette suspension la bande de feutre tamis qui court à environ 4C m/mn.
In the example below, the composition of the material suspensions and the implementation of the process are presented.
Suspension I 1 pp (part by weight) of short cut polyethylene fibers 0 to 100 pp of portland cement PZ35F 10 to 30 pp of polyacrylate dispersion and 100 to 500 pp of water
Suspension Il 1 pp of asbestos mixture 10 pp of portland cement PZ35F 10 to 40 pp of water
The suspension I is brought to the material inflow box 1 and the sieve felt strip which runs at around 4C m / min is supplied with this suspension.

La nappe qui se forme dans la région des caisses d'aspiration 1c constitue une couche auxiliaire de filtration pour la suspension II qui est amenée de la caisse d'afflux de matière 2. La nappe, formée maintenant de deux couches, est alors introduite dans la partie de moulage non représentée pour y etre enroulée autour d'un noyau d'acier (cylindre de formatou Mandrin) Jusqu'a ce que~lté- paisseur voulue du produit soit atteinte. The sheet which forms in the region of the suction boxes 1c constitutes an auxiliary filtration layer for the suspension II which is brought from the material inflow box 2. The sheet, now formed of two layers, is then introduced into the molding part not shown so as to be wound around a steel core (format or mandrel cylinder) until the desired thickness of the product is reached.

Claims (7)

REVENDICATIONS 1 - Procédé de fabrication d'un produit tiré de suspensions contenant des fibres par afflux de matière, en particulier pour la fabrication d'un matériau de construction stratifié à base de fibres-ciment, caractérisé par le fait 1.1 que l'afflux de matière s'effectue simultanément en au moins deux régions de dépôt séparées, 1.2 que l'on utilise des suspensions contenant des fibres ayant une consistance différente ou égale, 1.3 que dans la première région de dépôt, on engendre une couche auxiliaire de filtration. 1 - Method for manufacturing a product obtained from suspensions containing fibers by influx of material, in particular for the manufacture of a laminated building material based on fiber cement, characterized by the fact 1.1 that the influx of material is carried out simultaneously in at least two separate deposition regions, 1.2 that suspensions containing fibers having a different or equal consistency are used, 1.3 that in the first deposition region, an auxiliary filtration layer is produced. 2 - Procédé selon la revendication 1, caractérisé par le fait que dans la deuxième région de dépôt et dans les régions de dépôt qui lui font éventuelle- ment suite, on amène des suspensions contenant des fibres et ayant une plus forte consistance. 2 - A method according to claim 1, characterized in that in the second deposition region and in the deposition regions which may follow it, suspensions containing fibers are brought in and having a higher consistency. 3 - Procédé selon les revendications 1 et 2, caractérisé par le fait qu'au moins une des suspensions amenées dans les régions de dépôt contient du liant. 3 - Process according to claims 1 and 2, characterized in that at least one of the suspensions brought into the deposition regions contains binder. 4 - Procédé selon la revendication 3, caractérisé par le fait que les suspensions ont des compositions différentes qualitativement et quantitativement, aussi bien en ce qui concerne les matières fibreuses que le liant. 4 - Process according to claim 3, characterized in that the suspensions have different compositions qualitatively and quantitatively, both as regards the fibrous materials as the binder. 5 - Procédé selon la revendication 3, caractérisé par le fait que l'afflux de matière s'effectue dans deux ou plusieurs régions de dépôt avec des suspensions de matière ayant la même composition qualitative et quantitative. 5 - Process according to claim 3, characterized in that the influx of material takes place in two or more deposition regions with suspensions of material having the same qualitative and quantitative composition. 6 - Appareil d'afflux de matière pour la mise en oeuvre du procédé selon les revendications 1 à 5, caractérisé par le fait qu'il comporte au moins deux caisses d'afflux ou de dépôt (1,2), se faisant suite, munies chacune d'une entrée spéciale de matière (1a,2a) d'un trop-plein et d'une sortie de matière (lob, 2b), et alimentant chacune un côté d'une bande de feutre ou de tamis sans fin (3) de l'autre côté de laquelle sont prévus des dispositifs d'aspiration (tic, 2c). 6 - Material inflow apparatus for implementing the method according to claims 1 to 5, characterized in that it comprises at least two inflow or deposit boxes (1,2), following one another, each provided with a special material inlet (1a, 2a) with an overflow and a material outlet (lob, 2b), and each feeding one side with a strip of felt or endless sieve ( 3) on the other side of which are provided suction devices (tick, 2c). 7 - Appareil selon la revendication 6, caractérisé par le fait que les caisses d'afflux de matière (1,2) peuvent être branchées en série et que la sortie de matière (lob) de la caisse (1) est alors reliée à l'entrez de matière (2a) de la caisse (2).  7 - Apparatus according to claim 6, characterized in that the material inflow boxes (1,2) can be connected in series and that the material outlet (lob) of the box (1) is then connected to the 'enter material (2a) from the body (2).
FR8012368A 1979-06-11 1980-06-04 Direct feeding of differently constituted fibre-contg. suspensions - into separate depositing zones for asbestos cement structure prodn. Granted FR2477947A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792923936 DE2923936C2 (en) 1979-06-11 1979-06-11 Process for the manufacture of a product from fibers and a binder

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FR2477947A1 true FR2477947A1 (en) 1981-09-18
FR2477947B1 FR2477947B1 (en) 1983-11-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000071315A1 (en) * 1999-05-21 2000-11-30 Valkeakoski X-Tec Oy Ltd Concrete product and method and apparatus for producing a concrete product

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422345A (en) * 1940-08-02 1947-06-17 Carey Philip Mfg Co Manufacture of hydraulic cement products
FR1259404A (en) * 1960-03-04 1961-04-28 Saint Gobain Process and devices for the manufacture of agglomerated products containing fibers of mineral matter, in particular glass fibers
FR2226255A1 (en) * 1973-04-18 1974-11-15 Onoda Cement Co Ltd

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT149470B (en) * 1936-04-25 1937-05-10 Wietersdorfer Zement U Durit W Method and device for pile formation on felt webs.
AT249493B (en) * 1963-09-04 1966-09-26 Anton Volpini De Dipl Maestri Wire section for paper machines
DE6601032U (en) * 1965-07-02 1969-03-06 Sandy Hill Corp PAPER MAKING MACHINE
US3870546A (en) * 1973-02-12 1975-03-11 Nat Gypsum Co Asbestos-cement product and process
FR2355787A1 (en) * 1976-02-02 1978-01-20 Solvay Mortar for wall facings or fixing tiles - where toxic asbestos fibres are replaced by polyethylene fibrils
DE2726627A1 (en) * 1976-06-15 1977-12-29 Fritz Ullrich Composite setting accelerator for hydraulic mortar or concrete - contg. acrylic resin as thixotropy-promoting agent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422345A (en) * 1940-08-02 1947-06-17 Carey Philip Mfg Co Manufacture of hydraulic cement products
FR1259404A (en) * 1960-03-04 1961-04-28 Saint Gobain Process and devices for the manufacture of agglomerated products containing fibers of mineral matter, in particular glass fibers
FR2226255A1 (en) * 1973-04-18 1974-11-15 Onoda Cement Co Ltd

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000071315A1 (en) * 1999-05-21 2000-11-30 Valkeakoski X-Tec Oy Ltd Concrete product and method and apparatus for producing a concrete product

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Publication number Publication date
FR2477947B1 (en) 1983-11-10
DE2923936A1 (en) 1980-12-18
DE2923936C2 (en) 1985-09-19

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