EP1507636B1 - Method of producing plaster boards comprising four tapered edges - Google Patents

Method of producing plaster boards comprising four tapered edges Download PDF

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Publication number
EP1507636B1
EP1507636B1 EP03747485A EP03747485A EP1507636B1 EP 1507636 B1 EP1507636 B1 EP 1507636B1 EP 03747485 A EP03747485 A EP 03747485A EP 03747485 A EP03747485 A EP 03747485A EP 1507636 B1 EP1507636 B1 EP 1507636B1
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EP
European Patent Office
Prior art keywords
lines
protuberances
facing paper
line
paper
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EP03747485A
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German (de)
French (fr)
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EP1507636A1 (en
Inventor
Michel Capron
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Etex France Building Performance SA
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Lafarge Platres SA
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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
    • B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
    • B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard

Definitions

  • the present invention relates to a method and devices for manufacturing gypsum board having 4 thinned edges on their periphery.
  • the technical field of the invention is the field of the manufacture of continuous plasterboard in which two sheets of cardboard, one lower called cream paper, the other upper called gray paper unwind and come to lock in a shaper which is either forming trays or forming rolls, a plaster based hydraulic binder.
  • This composite strip is sheared to length, it goes into a drying oven, it is finally re-sawed to final length before being stacked.
  • Such a method is well known elsewhere and therefore will not be described in itself in more detail in the present description.
  • GB-A-451 389 discloses a method and apparatus for continuous manufacture of gypsum board.
  • the transverse thinning resulting from the impressions have qualities of surface appearance, shape and strength identical to the longitudinal thinning and are well manufactured following a continuous process that 'proves to be of a very low cost and very interesting for the industrialists and the plasterboard market.
  • FIG. 1 represents a continuously operating plasterboard production line (12) of the type presented in the introduction, in which two sheets of cardboard paper, the lower one called cream paper (3), the another superior called gray paper (4), unwind and come enclose in a shaper (7) a hydraulic binder (2) from a mixer (1).
  • These two sheets of paperboard, cream (3) and gray (4) constitute with the hydraulic binder (2) a composite strip (10) which hardens on the two curing strips (8) and (9).
  • These two hardening strips (8) and (9) have at the edge of two small strips of bevels which will generate on the composite strip (10) the longitudinal thinning (13).
  • the composite strip (10) is cut to length 1 by the shear (11), the resulting plasterboard (12) are provided with longitudinal thinning (13) but are not provided with transverse thinning (14).
  • the method according to the invention precisely makes it possible to continuously generate transverse slices (14) in addition to longitudinal thinning (13) on the plaster boards (12) emerging from the shears (11).
  • the first step is to create an extra thickness under the cream paper (3) before it passes under the mixer (1) and before it crosses the shaper (7).
  • This extra thickness of about 1.5 mm under the cream paper (3), we will proceed to the stamping of said cream paper (3) following lines of bumps (20).
  • these bump lines (20) are straight lines of a length less than the width of the cream paper (3) centered and perpendicular to the direction of travel of said cream paper (3).
  • the bumps (16) of these bump lines (20) are spaced from each other by about 20 mm and protrude under the cream paper (3) about 1.5 mm. This value of 1.5 mm corresponds to the generally desired value of the transverse thinned height "b" (29).
  • These lines of bumps (20) are arranged under the cream paper (3) on the fly, fast rate, rate can be less than two seconds and following a specific step "p" (48).
  • This pitch “p” (48) depends on the desired length of the plasterboard (12), the longitudinal expansion of the composite strip (10) during its curing on the hardening strips (8) and (9) and the over-length required for sawn plasterboard (12) at the line exit. An interval or step “p" (48) that the skilled person know very well calculate.
  • these intermittently discontinuous lines of bosses (20) have the quite singular advantage of not disappearing or being erased under the mechanical "T" tension (47) of the cream paper (3). ) unlike other imagined methods of folding or embossing the cream paper (3) in a continuous pattern over a wide width.
  • the method of the invention simultaneously with stamping the bump lines (20), proceeds to notch the cream paper (3) along two stiffening notch lines (23).
  • These stiffening notch lines (23) are made on the outer side of the cream paper (3) on either side of each bump line (20) of the same length as the parallel and centrally aligned bump lines (20) with respect to lines of bumps (20).
  • the function of these two lines of stiffening notches is to strengthen, to help the bumps line (20) to support in the following process the weight of the hydraulic binder (2).
  • the length "1" (49) of the bump lines (20) is equal to the overall width of the plasterboard (12) reduced by the sum of the widths of the two longitudinal thinned (13).
  • the method according to the invention then consists, in the area located from the forming table (5) to the shaper (7), to protect the lines of bumps (20) against tearing, snagging or deformation.
  • all the asperities all attachment points (17) are removed, and grooves are provided on the spreader (6).
  • said spreader (6) generally vibrating or rotating shakes the cream paper (3) and the hydraulic binder (2) without affecting the bumps which pass them without contact in the hollow of its grooves, therefore without contact with said spreader (6).
  • the bump lines (20) passing through the shaper (7) locally lift the cream paper (3) and reduce by the same amount of hydraulic binder (2) contained in the composite strip (10). ), and the upper surface of the composite strip (10) leaving the shaper (7) will be uniformly flat despite the local uprisings of the latter.
  • the bumps lines (20) protruding under the cream paper (3) keep raised the composite strip (10) until its complete hardening.
  • the composite strip (10) at the outlet of the hardening strip (9) has on its underside double slope footprints (19) spaced apart from each other by a distance slightly greater than the length of gypsum board (12) to be produced.
  • the method according to the invention consists in the last phase in cutting the composite strip (10) using the shear (11) right, in the middle and in the axis of each of the double-slope footprints (19).
  • this gypsum board (12) then crosses the dryer, then it is sawn to length, this sawing completely removing the 1 ⁇ 2 lines of bumps (50) residual.
  • the gypsum boards (12) thinned on all their periphery are stacked and then join the stock of the plant.
  • the cutting by the shears (11) occurs simultaneously in the double-slope footprints (19) and at equal distance from two double-slope footprints (19), the plasterboard (12) thus produced have 3 thinned, two longitudinal thinned (13) a transverse thinned (14), these 3 thin plates are interesting for particular applications of the market.
  • the inner surface of the bumps (16), the interior of the bumps (22), and the upper and horizontal surface of the cream paper (3) located between the bumps (16) and the stiffening notches (23) also called reinforced surface (21) are covered with a coating (15).
  • This coating (15) being applied on the fly, immediately after the stamping operation of the bump lines (20).
  • the chemical composition of this coating (15) is such that it makes it possible with almost immediate effectiveness to increase the mechanical strength of the bumps (16), to waterproof and to protect against softening the bump lines (20), sealing said bump lines (20) with respect to the hydraulic binder (2), and finally ensuring on the reinforced surface (21) a good connection of the hydraulic binder (2) and cream paper (3).
  • the bump lines (20) are prolonged at each of their ends along a length equal to the width of the longitudinal thinning (13).
  • This bump line extension (28) is formed of bumps (16) that are reduced in depth as the bump line extension (28) approaches the outer edge of the cream paper (3).
  • This extension of bumps line (28), when crossing the hardening strips (8) and (9), is supported on the bevel strips that are used to make the longitudinal thinning (13).
  • the shape of the bumps (16) generated by stamping is adapted so that the latter have the best possible mechanical characteristics, they can be indifferently without it is limiting of hemispherical, pyramidal, conical shape, in 1 ⁇ 2 moon
  • the cream paper (3) at its beginning of transverse thinning (14) is marked with a slight notch, this transverse thinning start marking line (14) improves at the both the geometry and the aesthetics of the transverse thinning (14).
  • This transverse taper start marking line (24) is of the same length and parallel to the bump line (20) and is naturally located relative thereto at a distance equal to the width of the transverse taper "a "(27).
  • This transverse thinning start marking line (24) which proceeds by a slight notching of the cream paper (3) indifferently to the outside or inside of the latter is carried out simultaneously with the stamping of the bump lines ( 20).
  • the cream paper (3) is marked at the connecting line of the transverse thinning (14) and the longitudinal thinning (13).
  • This thinning line (26) connects the end of the transverse thinning start marking line (14) to the end of the stiffening slot line (23).
  • This thinning connection line (26) naturally has an angle "c" (46) of 45 ° with respect to the principal axes of the transverse slices (14) and the longitudinal thinned (13).
  • This thinning fitting line (26) improves both the geometry and the aesthetics of the cross section of the transverse thinning (14) and the longitudinal thinning (13).
  • This thinning connection line (26) which proceeds by lightly notching the cream paper (3) indifferently outside or inside the latter is performed simultaneously with the stamping lines of bumps (20).
  • the outer surface of the cream paper (3) corresponding to the future transverse thinned (14) is roughened to promote the adhesion of the grouting compound which will later be applied in this area during the implementation of the plasterboard (12).
  • This rough surface (25) corresponding to the polygons defined by the line of the stiffening notch (23), the transverse thinning start marking line (24) and the two thinning connection lines is obtained either by pecking, either by knurling, by stamping, or by rubbing said surface.
  • This step of the method according to the invention for producing the rough surfaces (25) takes place simultaneously with stamping the bump lines (20).
  • the first device referred to as a stamping follower device (30) associated with the method according to the invention appearing in FIG. 1 and detailed in FIGS. 3 and 4 proceeds to all the phases of the method according to the invention of docking and machining on the fly. and at a fast rate of the cream paper (3) before the latter engages under the mixer (1).
  • These said machining operations are the embossing of the bump lines (20), the embossing of the bump line extensions (28), the coating of the bumps (16), the coating of the reinforced surface (21). ), producing the stiffening notches (23), notching the transverse taper start marking lines (24), notching the tapered connecting lines (26), and producing the rough surface ( 25).
  • the stamping follower device (30) driven by its transmission motor (33) catches and starts a few fractions of seconds at the same speed as the cream paper (3).
  • the lower table (31) integral with the stamping follower device (30) moves up and down by means of the jacks and guides (34).
  • the lower table (31) compresses the cream paper against the upper table (32) also integral with the stamping follower device (30).
  • the tools equipping the lower table (31) and the upper table (32) come into effect and thus locally mill the cream paper (3).
  • the punches (35) equipping the upper table (32) and the dies (36) equipping the lower table (31) achieve the bumps lines (20) and according to a variant of the method of the invention the extensions of bumps lines (28).
  • stampers (37) equipping the lower table (31) and counter stamps (38) equipping the upper table (32) perform the stiffening notches (23), the transverse thinning start marking lines (24), the thinning connection lines (26), potting the rough surface (25). More specifically, the inner edge (39) of the stamper (37) produces the stiffening notch, the outer edge (40) of the stamper (37) produces the thinned start marking lines and the the thimbles (41) of the stamper produce the rough surfaces (25).
  • the nozzles (44) located between the punches (35) project on the bumps (16) and on the reinforced surface (21) the coating (15) whose main function is holding and reinforcing bumps (16).
  • the stamping follower device (30) in position "O2" when machining cream paper (3) quickly returns back to position "O1", a new cycle of docking and machining of cream paper (3) resumes at a step "p" (48) of the previous machining of the cream paper (3) and so on the cycle is repeated.
  • the transmission motor (33) is associated with an adapted electronics, and the pulse generator (42) which permanently measures the scrolling of the paper cream (3). This motor transmission (33) can thus dock fast frequency cream paper (3) and allow all the steps "p" (48) machining necessary for the method according to the invention.
  • the punches (35) and the dies (36) make it possible, by their shapes and forms, to make bumps (16) which are either hemispherical or pyramidal or conical or else in 1 ⁇ 2 moon without these forms being limiting.
  • the method of the invention protects the bumps (16) during their passage in the area of the forming table (5) to the shaper (7).
  • all the asperities of the forming table (5) all attachment points (17) of the guides and forming rules are removed.
  • Grooves are provided on the spreader (6), so that the spreader (6) generally a vibrating table or drumming rolls beat the cream paper (3) to spread the hydraulic binder (2) without affecting the bumps (16) which they passing through the grooves pass without being touched by the spreader (6).
  • the said zone located from the forming table (5) to the shaper (7) in no way affects the bump lines (20).
  • the second device ensuring the cut right fingerprints (19) consists of the fingerprint sensor (18) at a distance "d” of the shears (2) and a suitable electronics that know the speed "V" of the band Composite (45) instructs the shear (11) to sever the composite strip (10) at the right of the double slope footprint (19).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Toys (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Cosmetics (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Finishing Walls (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a method of producing plaster boards ( 12 ) in which two bound sheets of paper, namely one cream paper ( 3 ) and one grey paper ( 4 ), enclose a plaster-based hydraulic binder ( 2 ) in a former ( 7 ), thereby creating a composite strip ( 10 ) which hardens on two hardening strips ( 8 and 9 ), said strips having two horizontal tapering strips disposed along the edge thereof. The invention consists in: shaping the cream paper ( 3 ) along emboss lines ( 20 ); providing stiffening slots ( 23 ) on either side of the emboss lines ( 20 ); reinforcing the mechanical strength of said emboss lines ( 20 ) by covering same with a coating ( 15 ); allowing the emboss lines ( 20 ) to exceed the aforementioned former ( 7 ) and the hardening strips ( 8 and 9 ) and generating the double slope imprint ( 19 ); and, subsequently, cutting the composite strip ( 10 ) to the right and at the middle of each double slope imprint ( 19 ).

Description

La présente invention concerne un procédé et des dispositifs pour fabriquer des plaques de plâtre présentant 4 bords amincis sur leur périphérie.The present invention relates to a method and devices for manufacturing gypsum board having 4 thinned edges on their periphery.

Le secteur technique de l'invention est le domaine de la fabrication de plaques de plâtre en continu dans lequel deux feuilles de papier cartonnées, l'une inférieure appelée papier crème, l'autre supérieure appelée papier gris se déroulent et viennent enfermer dans un conformateur, qui est soit des plateaux de formage soit des rouleaux de formage, un liant hydraulique à base de plâtre.The technical field of the invention is the field of the manufacture of continuous plasterboard in which two sheets of cardboard, one lower called cream paper, the other upper called gray paper unwind and come to lock in a shaper which is either forming trays or forming rolls, a plaster based hydraulic binder.

Ces deux feuilles de papier cartonnées constituent avec ce liant hydraulique une bande composite qui durcit généralement sur deux bandes de durcissement, sur les bordures desquelles sont présentes deux petites bandes de réservation d'aminci permettant d'aménager des bords amincis longitudinaux à la future plaque.These two sheets of paperboard constitute with this hydraulic binder a composite strip which generally hardens on two curing strips, on the edges of which are present two small taper reservation strips for arranging longitudinal thinned edges to the future plate.

Cette bande composite est cisaillée à longueur voulue, elle passe dans un four de séchage, elle est enfin re-sciée à longueur définitive avant d'être empilée. Un tel procédé est bien connu par ailleurs et ne sera donc pas décrit en lui-même plus en détail dans la présente description.This composite strip is sheared to length, it goes into a drying oven, it is finally re-sawed to final length before being stacked. Such a method is well known elsewhere and therefore will not be described in itself in more detail in the present description.

L'intérêt des amincis tout autour de la plaque de plâtre est connu et apprécié depuis longtemps. En effet, ils facilitent l'aboutement et le jointoiement des plaques de plâtre et permettent de réaliser des ouvrages de grandes surfaces présentant une parfaite planéité et une excellente résistance mécanique.The interest of thinning all around the plasterboard is known and appreciated for a long time. Indeed, they facilitate the abutment and grouting plasterboard and allow to achieve large surfaces with perfect flatness and excellent mechanical strength.

Il est connu depuis très longtemps, sur ces lignes de fabrication fonctionnant en continu, de produire des plaques de plâtre avec des bords amincis longitudinaux, mais aucun procédé ne permet de fabriquer sur ces lignes fonctionnant en continu des plaques de plâtre avec des amincis transversaux présentant les mêmes caractéristiques que les bords amincis longitudinaux.It has been known for a very long time, on these continuous production lines, to produce gypsum boards with longitudinal thinned edges, but no method makes it possible to manufacture on these lines operating continuously gypsum board with transverse thin sections presenting the same characteristics as the longitudinal thinned edges.

Il y a bien sûr eu de nombreuses tentatives et de nombreux brevets ont été pris et essentiellement des brevets américains pour tenter de résoudre ce problème de production en continu des amincis transversaux. Le brevet GB-A-451 389 décrit un procédé et un dispositif pour la fabrication continu de plaques de plâtre.There have of course been many attempts and many patents have been taken and essentially US patents to try to solve this problem of continuous production of transverse thinning. GB-A-451 389 discloses a method and apparatus for continuous manufacture of gypsum board.

Le brevet US 2,238,017 en particulier tentait en 1941 de créer une surépaisseur par pliage du carton, cette invention n'a jamais donné de développement industriel, probablement parce que le pliage ne résistait pas à la tension du papier, ou au poids du liant hydraulique.US Pat. No. 2,238,017, in particular, attempted in 1941 to create a bend allowance of the carton, this invention never gave rise to industrial development, probably because the bending did not withstand the tension of the paper, or the weight of the hydraulic binder.

Force est de reconnaître qu'aujourd'hui les plaques avec des amincis transversaux si elles existent sont, soit des usinages d'extrémités appelés dans le métier biseautage, soit des artifices comme un rainurage, pressage et collage du bord, soit encore plus fréquemment l'artisan qui rabote son bord de plaque pour y aménager un aminci transversal.It must be recognized that today the plates with transverse thinning if they exist are either end machining called in the bevelling craft, or artifices such as grooving, pressing and gluing the edge, or even more frequently. craftsman who plans his plate edge to build a transverse thinning.

Ces solutions sont toutes coûteuses à l'échelle du prix de revient de la plaque et de plus l'aminci transversal ainsi réalisé est loin d'avoir les qualités de l'aminci longitudinal. Il y a aujourd'hui une vraie attente du marché et une vraie attente de l'industrie en ce qui concerne cette situation.These solutions are all expensive on the scale of the cost price of the plate and more transverse thinned thus achieved is far from having the qualities of longitudinal thinning. There is today a real expectation of the market and a real expectation of industry in this situation.

Le procédé et ses dispositifs selon l'invention permettent de remédier à ces inconvénients. Une solution au problème posé est décrit dans les revendications 1 et 8.The method and its devices according to the invention make it possible to remedy these drawbacks. A solution to the problem is described in claims 1 and 8.

Le résultat est un nouveau procédé et dispositifs de fabrication répondant bien au problème posé, les amincis transversaux résultant des empreintes ont des qualités d'aspect de surface, de forme et de résistance identiques aux amincis longitudinaux et sont bien fabriqués suivant un processus continu qui s'avère être d'un coût très faible et très intéressant pour les industriels et le marché de la plaque de plâtre.The result is a new process and manufacturing devices that respond well to the problem posed, the transverse thinning resulting from the impressions have qualities of surface appearance, shape and strength identical to the longitudinal thinning and are well manufactured following a continuous process that 'proves to be of a very low cost and very interesting for the industrialists and the plasterboard market.

La description et les figures ci après représentent un exemple de fabrication de plaques cartonnées à base de plâtre montrant les avantages particuliers de l'invention tels que ceux cités précédemment, mais n'ont aucun caractère limitatif : d'autres fabrication sont possibles dans le cadre de la portée et de l'étendue de l'invention, en particulier la fabrication de plaques de plâtre utilisant des papiers à base minérale ou des mats de verre à la place des papiers cartonnés ou encore plus généralement la fabrication de plaques utilisant deux feuilles ou une enveloppe enfermant après passage dans un conformateur, un liant hydraulique à prise ou à séchage.

  • La figure 1 représente la tête de ligne de fabrication dans laquelle intervient le nouveau procédé de l'invention.
  • La figure 1a, représente, selon l'invention, en vue de coté et grossie la ligne de bosses, juste avant passage sous le mélangeur.
  • La figure 1b, représente, selon l'invention, en vue de coté et grossie la ligne de bosses, juste après passage sous le mélangeur et avant passage dans le conformateur.
  • La figure 1c, représente , selon l'invention, en vue de coté et grossie la ligne de bosses, juste après passage dans le conformateur et en cours de passage sur les bandes de durcissement.
  • La figure 1d, représente, selon l'invention, en vue de coté et grossie la ligne de bosses, en sortie des bandes de durcissement et avant la coupe cisaille.
  • La figure 1e, représente, selon l'invention, en vue de coté et grossie la ligne de bosses, juste après la coupe cisaille.
  • La figure 2 représente une plaque de plâtre à 4 bords amincis fabriquée avec le procédé de l'invention.
  • La figure 3 représente le dispositif selon l'invention d'accostage du papier crème et de réalisation des lignes de bosses.
  • La figure 4 représente la vue suivant F du dispositif de la figure 3.
  • La figure 5 représente, selon l'invention, le papier crème vue de dessous, avec ses usinages après qu'il eut franchi le dispositif des figures 3 et 4.
  • La figure 6 représente, selon l'invention, la vue en coupe et en perspective SS' RR' du papier crème de la figure 5.
  • La figure 7 représente, selon l'invention, la vue de coté et en coupe du papier crème au niveau de la ligne de bosses avant passage sous le mixer.
  • La figure 8 représente, selon l'invention, la vue de coté et en coupe de la bande composite au niveau de la ligne de bosses après passage dans le conformateur.
  • Les figures 9 et 10 représentent, selon l'invention, la vue de coté et en coupe de la bande composite au niveau de la ligne de bosses immédiatement après l'opération de cisaillage.
The description and the figures below represent an example of manufacture of gypsum board plates showing the particular advantages of the invention such as those mentioned above, but have no limiting character: other manufacturing is possible in the context of the invention. the scope and scope of the invention, in particular the manufacture of plasterboard using mineral-based papers or glass mats instead of paperboard or more generally the manufacture of plates using two sheets or a casing enclosing after passing through a shaper, a hydraulic binder set or drying.
  • FIG. 1 represents the manufacturing line head in which the new method of the invention operates.
  • Figure 1a shows, according to the invention, side view and enlarged line of bumps just before passing under the mixer.
  • Figure 1b shows, according to the invention, side view and enlarged line of bumps, just after passing under the mixer and before passing through the shaper.
  • Figure 1c shows, according to the invention, in side view and enlarged line of bumps just after passing through the shaper and being passed over the curing strips.
  • Figure 1d shows, according to the invention, in side view and enlarged the line of bumps, at the exit of the curing strips and before cutting shears.
  • Figure 1e shows, according to the invention, in side view and enlarged line of bumps, just after cutting shears.
  • Figure 2 shows a plasterboard with 4 thinned edges manufactured with the method of the invention.
  • FIG. 3 represents the device according to the invention for docking the cream paper and for producing the bump lines.
  • FIG. 4 represents the following view F of the device of FIG.
  • FIG. 5 represents, according to the invention, the cream paper seen from below, with its machining after it had crossed the device of FIGS. 3 and 4.
  • FIG. 6 represents, according to the invention, the sectional and perspective view SS 'RR' of the cream paper of FIG. 5.
  • 7 shows, according to the invention, the side view and section of the cream paper at the line of bumps before passing under the mixer.
  • Figure 8 shows, according to the invention, the side view and sectional of the composite strip at the line of bumps after passing through the shaper.
  • Figures 9 and 10 show, according to the invention, the side view and in section of the composite strip at the line of bumps immediately after the shearing operation.

La figure 1 représente une ligne de fabrication de plaque de plâtre (12), fonctionnant en continue, du type de celle présentée dans l'introduction, dans laquelle deux feuilles de papier cartonnée l'une inférieure appelée papier crème (3), l'autre supérieure appelée papier gris (4), se déroulent et viennent enfermer dans un conformateur (7) un liant hydraulique (2) provenant d'un mélangeur (1). Ces deux feuilles de papier cartonnées, crème (3) et gris (4) constituent avec le liant hydraulique (2) une bande composite (10) qui durcit sur les deux bandes de durcissement (8) et (9). Ces deux bandes de durcissement (8) et (9) disposent en bordure de deux petites bandes en biseaux qui vont générer sur la bande composite (10) les amincis longitudinaux (13). La bande composite (10) est coupée à longueur 1 par la cisaille (11), les plaques de plâtres (12) qui en résultent sont munies d'amincis longitudinaux (13) mais ne sont pas munies d'amincis transversaux (14).FIG. 1 represents a continuously operating plasterboard production line (12) of the type presented in the introduction, in which two sheets of cardboard paper, the lower one called cream paper (3), the another superior called gray paper (4), unwind and come enclose in a shaper (7) a hydraulic binder (2) from a mixer (1). These two sheets of paperboard, cream (3) and gray (4) constitute with the hydraulic binder (2) a composite strip (10) which hardens on the two curing strips (8) and (9). These two hardening strips (8) and (9) have at the edge of two small strips of bevels which will generate on the composite strip (10) the longitudinal thinning (13). The composite strip (10) is cut to length 1 by the shear (11), the resulting plasterboard (12) are provided with longitudinal thinning (13) but are not provided with transverse thinning (14).

Le procédé selon l'invention permet précisément de générer en continu des amincis transversaux (14) en plus des amincis longitudinaux (13) sur les plaques de plâtres (12) sortant de la cisaille (11).The method according to the invention precisely makes it possible to continuously generate transverse slices (14) in addition to longitudinal thinning (13) on the plaster boards (12) emerging from the shears (11).

Selon le procédé de l'invention, la première étape consiste à créer une surépaisseur sous le papier crème (3) avant que ce dernier ne passe sous le mélangeur (1) et avant qu'il ne franchisse le conformateur (7). Pour créer cette surépaisseur d'environ 1.5 mm sous le papier crème (3), on va procéder à l'emboutissage du dit papier crème (3) suivant des lignes de bosses (20).According to the method of the invention, the first step is to create an extra thickness under the cream paper (3) before it passes under the mixer (1) and before it crosses the shaper (7). To create this extra thickness of about 1.5 mm under the cream paper (3), we will proceed to the stamping of said cream paper (3) following lines of bumps (20).

Selon l'invention, ces lignes de bosses (20) sont des lignes droites d'une longueur inférieure à la largeur du papier crème (3) centrées et perpendiculaires au sens de défilement du dit papier crème (3). Les bosses (16) de ces lignes de bosses (20) sont espacées les unes des autres d'environ 20 mm et font saillies sous le papier crème (3) d'environ 1.5 mm. Cette valeur de 1.5 mm correspondant à la valeur généralement recherchée de la hauteur d'aminci transversal "b" (29). Ces lignes de bosses (20) sont aménagées sous le papier crème (3) à la volée, à cadence rapide, cadence pouvant être inférieure à deux secondes et suivant un pas précis "p" (48). Ce pas "p" (48) dépend de la longueur recherchée de la plaque de plâtre (12), de l'expansion longitudinale de la bande composite (10) lors de son durcissement sur les bandes de durcissement (8) et (9) et de la sur-longueur nécessaire aux sciages des plaques de plâtre (12) en sortie ligne. Un intervalle ou un pas "p" (48) que les hommes du métier savent très bien calculer.According to the invention, these bump lines (20) are straight lines of a length less than the width of the cream paper (3) centered and perpendicular to the direction of travel of said cream paper (3). The bumps (16) of these bump lines (20) are spaced from each other by about 20 mm and protrude under the cream paper (3) about 1.5 mm. This value of 1.5 mm corresponds to the generally desired value of the transverse thinned height "b" (29). These lines of bumps (20) are arranged under the cream paper (3) on the fly, fast rate, rate can be less than two seconds and following a specific step "p" (48). This pitch "p" (48) depends on the desired length of the plasterboard (12), the longitudinal expansion of the composite strip (10) during its curing on the hardening strips (8) and (9) and the over-length required for sawn plasterboard (12) at the line exit. An interval or step "p" (48) that the skilled person know very well calculate.

Selon le procédé de l'invention, ces lignes de bosses (20) par définition discontinues présentent l'avantage tout à fait singulier de ne pas disparaître ni de s'effacer sous la tension "T" mécanique (47) du papier crème (3) contrairement à d'autres procédés imaginés qui consistent à plier ou à embosser suivant un profil continu et sur une grande largeur le papier crème (3).According to the method of the invention, these intermittently discontinuous lines of bosses (20) have the quite singular advantage of not disappearing or being erased under the mechanical "T" tension (47) of the cream paper (3). ) unlike other imagined methods of folding or embossing the cream paper (3) in a continuous pattern over a wide width.

Le procédé de l'invention, simultanément à l'emboutissage des lignes de bosses (20), procède à l'encochage du papier crème (3) suivant deux lignes d'encoche raidisseuses (23). Ces lignes d'encoches raidisseuses (23) sont réalisées côté extérieure au papier crème (3) de part et d'autre de chaque ligne de bosse (20) de même longueur que les lignes de bosses (20) parallèlement et centrées par rapport aux lignes de bosses (20). La fonction de ces deux lignes d'encoches raidisseuses est de renforcer, d'aider la ligne de bosses (20) à supporter dans la suite du procédé le poids du liant hydraulique (2).The method of the invention, simultaneously with stamping the bump lines (20), proceeds to notch the cream paper (3) along two stiffening notch lines (23). These stiffening notch lines (23) are made on the outer side of the cream paper (3) on either side of each bump line (20) of the same length as the parallel and centrally aligned bump lines (20) with respect to lines of bumps (20). The function of these two lines of stiffening notches is to strengthen, to help the bumps line (20) to support in the following process the weight of the hydraulic binder (2).

Selon une variante du procédé de l'invention, la longueur "1" (49) des lignes de bosses (20) est égale à la largeur hors tout de la plaque de plâtre (12) réduite de la somme des largeurs des deux amincis longitudinaux (13).According to a variant of the method of the invention, the length "1" (49) of the bump lines (20) is equal to the overall width of the plasterboard (12) reduced by the sum of the widths of the two longitudinal thinned (13).

Le procédé selon l'invention consiste ensuite, dans la zone située de la table de formage (5) au conformateur (7), à protéger les lignes de bosses (20) contre l'arrachement, l'accrochage ou la déformation. Pour cela, dans la dite zone toutes les aspérités, tous les points d'accrochage (17) sont supprimés, et des rainures sont aménagées sur l'étaleur (6). Ainsi équipé de rainures, le dit étaleur (6) généralement vibrant ou rotatif secoue le papier crème (3) et le liant hydraulique (2) sans affecter les bosses qui passent elles sans contact dans le creux de ses rainures, donc sans contact avec ledit étaleur (6).The method according to the invention then consists, in the area located from the forming table (5) to the shaper (7), to protect the lines of bumps (20) against tearing, snagging or deformation. For this, in the said area all the asperities, all attachment points (17) are removed, and grooves are provided on the spreader (6). Thus equipped with grooves, said spreader (6) generally vibrating or rotating shakes the cream paper (3) and the hydraulic binder (2) without affecting the bumps which pass them without contact in the hollow of its grooves, therefore without contact with said spreader (6).

Selon le procédé de l'invention, les lignes de bosses (20) en traversant le conformateur (7) soulèvent localement le papier crème (3) et réduisent d'autant la quantité de liant hydraulique (2) contenue dans la bande composite (10), ainsi la surface supérieure de la bande composite (10) sortant du conformateur (7) sera uniformément plane malgré les soulèvements locaux de cette dernière.According to the method of the invention, the bump lines (20) passing through the shaper (7) locally lift the cream paper (3) and reduce by the same amount of hydraulic binder (2) contained in the composite strip (10). ), and the upper surface of the composite strip (10) leaving the shaper (7) will be uniformly flat despite the local uprisings of the latter.

Selon le procédé de l'invention, les lignes de bosses (20) faisant saillies sous le papier crème (3) maintiennent soulevée la bande composite (10) jusqu'à son complet durcissement.According to the method of the invention, the bumps lines (20) protruding under the cream paper (3) keep raised the composite strip (10) until its complete hardening.

Selon le procédé de l'invention, la bande composite (10) en sortie de bande de durcissement (9) présente sur sa face inférieure des empreintes doubles pentes (19) espacées les unes des autres d'une distance légèrement supérieure à la longueur des plaques de plâtre (12) à produire.According to the method of the invention, the composite strip (10) at the outlet of the hardening strip (9) has on its underside double slope footprints (19) spaced apart from each other by a distance slightly greater than the length of gypsum board (12) to be produced.

Le procédé selon l'invention consiste en dernière phase à couper la bande composite (10) à l'aide de la cisaille (11) au droit, en plein milieu et dans l'axe de chacune des empreintes doubles pentes (19).The method according to the invention consists in the last phase in cutting the composite strip (10) using the shear (11) right, in the middle and in the axis of each of the double-slope footprints (19).

Le résultat, à ce stade du procédé selon l'invention, est une plaque de plâtre (12) avec à sa périphérie 4 bords amincis, deux amincis longitudinaux (13) traditionnels et deux amincis transversaux (14) générés par le procédé selon l'invention, cette plaque de plâtre (12) franchit ensuite le séchoir, puis elle est sciée à longueur, ce sciage faisant disparaître complètement les ½ lignes de bosses (50) résiduelles. Les plaques de plâtre (12) munies d'amincis sur toutes leur périphérie sont empilées et rejoignent ensuite le stock de l'usine.The result, at this stage of the process according to the invention, is a gypsum board (12) with at its periphery four thinned edges, two traditional longitudinal thinning (13) and two transverse thinning (14) generated by the method according to the invention. invention, this gypsum board (12) then crosses the dryer, then it is sawn to length, this sawing completely removing the ½ lines of bumps (50) residual. The gypsum boards (12) thinned on all their periphery are stacked and then join the stock of the plant.

Selon une variante du procédé de l'invention, la coupe par la cisaille (11) intervient simultanément dans les empreintes double pentes (19) et à distance égale de deux empreintes double pentes (19), les plaques de plâtre (12) ainsi produites présentent 3 amincis, deux amincis longitudinaux (13) un aminci transversal (14), ces plaques à 3 amincis sont intéressantes pour des applications particulières du marché.According to a variant of the method of the invention, the cutting by the shears (11) occurs simultaneously in the double-slope footprints (19) and at equal distance from two double-slope footprints (19), the plasterboard (12) thus produced have 3 thinned, two longitudinal thinned (13) a transverse thinned (14), these 3 thin plates are interesting for particular applications of the market.

Selon une variante du procédé de l'invention, la surface intérieure des bosses (16), l'intérieur des fonds de bosses (22), ainsi que la surface supérieure et horizontale du papier crème (3) situé entre les bosses (16) et les encoches raidisseuses (23) encore appelée surface renforcée (21) sont recouvertes d'un enduit (15). Cet enduit (15) étant appliqué à la volée, immédiatement après l'opération d'emboutissage des lignes de bosses (20). La composition chimique de cet enduit (15) est telle qu'il permet avec une efficacité quasi immédiate d'augmenter la tenue mécanique des bosses (16), d'imperméabiliser et de protéger contre le ramollissement les lignes de bosses (20), de rendre étanche lesdites lignes de bosses (20) vis à vis du liant hydraulique (2), et enfin de garantir sur la surface renforcée (21) une bonne liaison du liant hydraulique (2) et du papier crème (3).According to a variant of the method of the invention, the inner surface of the bumps (16), the interior of the bumps (22), and the upper and horizontal surface of the cream paper (3) located between the bumps (16) and the stiffening notches (23) also called reinforced surface (21) are covered with a coating (15). This coating (15) being applied on the fly, immediately after the stamping operation of the bump lines (20). The chemical composition of this coating (15) is such that it makes it possible with almost immediate effectiveness to increase the mechanical strength of the bumps (16), to waterproof and to protect against softening the bump lines (20), sealing said bump lines (20) with respect to the hydraulic binder (2), and finally ensuring on the reinforced surface (21) a good connection of the hydraulic binder (2) and cream paper (3).

Selon une autre variante du procédé de l'invention et afin d'obtenir sur la plaque de plâtre (12) un bon raccordement géométrique des amincis transversaux (14) avec les amincis longitudinaux (13), les lignes de bosses (20) sont prolongées en chacune de leurs extrémités suivant une longueur égale à la largeur des amincis longitudinaux (13). Ce prolongement de ligne de bosses (28) est constitué de bosses (16) dont la profondeur se réduit au fur et à mesure que le dit prolongement de ligne de bosse (28) se rapproche du bord extérieur du papier crème (3). Ce prolongement de ligne de bosses (28), lors du franchissement des bandes de durcissement (8) et (9), vient prendre appui sur les bandes en biseau qui servent à la confection des amincis longitudinaux (13).According to another variant of the method of the invention and in order to obtain on the plasterboard (12) a good geometrical connection of the transverse slices (14) with the longitudinal thinning (13), the bump lines (20) are prolonged at each of their ends along a length equal to the width of the longitudinal thinning (13). This bump line extension (28) is formed of bumps (16) that are reduced in depth as the bump line extension (28) approaches the outer edge of the cream paper (3). This extension of bumps line (28), when crossing the hardening strips (8) and (9), is supported on the bevel strips that are used to make the longitudinal thinning (13).

Selon une variante du procédé de l'invention la forme des bosses (16) générées par emboutissage est adaptée afin que ces dernières présentent les meilleures caractéristiques mécaniques possibles, elles peuvent être indifféremment sans que ce soit limitatif de forme hémi sphérique, pyramidale, conique, en ½ luneAccording to a variant of the method of the invention the shape of the bumps (16) generated by stamping is adapted so that the latter have the best possible mechanical characteristics, they can be indifferently without it is limiting of hemispherical, pyramidal, conical shape, in ½ moon

Selon une variante du procédé de l'invention, le papier crème (3) en son début d'aminci transversal (14) est marqué d'un léger encochage, cette ligne de marquage de début d'aminci transversal (14) améliore à la fois la géométrie et l'esthétisme de l'aminci transversal (14). Cette ligne de marquage de début d'aminci transversal (24) est de même longueur et parallèle à la ligne de bosses (20) et se situe naturellement par rapport à cette dernière à une distance égale à la largeur de l'aminci transversal "a " (27). Cette ligne de marquage de début d'aminci transversal (24) qui procède par un encochage léger du papier crème (3) indifféremment à l'extérieur ou à l'intérieur de ce dernier est réalisée simultanément à l'emboutissage des lignes de bosses (20).According to one variant of the process of the invention, the cream paper (3) at its beginning of transverse thinning (14) is marked with a slight notch, this transverse thinning start marking line (14) improves at the both the geometry and the aesthetics of the transverse thinning (14). This transverse taper start marking line (24) is of the same length and parallel to the bump line (20) and is naturally located relative thereto at a distance equal to the width of the transverse taper "a "(27). This transverse thinning start marking line (24) which proceeds by a slight notching of the cream paper (3) indifferently to the outside or inside of the latter is carried out simultaneously with the stamping of the bump lines ( 20).

Selon une variante du procédé de l'invention, le papier crème (3) est marqué à la ligne de raccordement de l'aminci transversal (14) et de l'aminci longitudinal (13). Cette ligne de raccord d'amincis (26) relie l'extrémité de la ligne de marquage de début d'aminci transversal (14) à l'extrémité de la ligne d'encoche raidisseuse (23). Cette ligne de raccord d'amincis (26) fait naturellement un angle " c " (46) de 45° par rapport aux axes principaux des amincis transversaux (14) et des amincis longitudinaux (13). Cette ligne de raccord d'amincis (26) améliore à la fois la géométrie et l'esthétisme de la zone de rencontre de l'aminci transversal (14) et de l'aminci longitudinal (13). Cette ligne de raccord d'amincis (26) qui procède par un encochage léger du papier crème (3) indifféremment à l'extérieur ou à l'intérieur de ce dernier est réalisée simultanément à l'emboutissage des lignes de bosses (20).According to a variant of the process of the invention, the cream paper (3) is marked at the connecting line of the transverse thinning (14) and the longitudinal thinning (13). This thinning line (26) connects the end of the transverse thinning start marking line (14) to the end of the stiffening slot line (23). This thinning connection line (26) naturally has an angle "c" (46) of 45 ° with respect to the principal axes of the transverse slices (14) and the longitudinal thinned (13). This thinning fitting line (26) improves both the geometry and the aesthetics of the cross section of the transverse thinning (14) and the longitudinal thinning (13). This thinning connection line (26) which proceeds by lightly notching the cream paper (3) indifferently outside or inside the latter is performed simultaneously with the stamping lines of bumps (20).

Selon une variante du procédé de l'invention, la surface extérieure du papier crème (3) correspondant au futur aminci transversal (14) est rendu rugueuse afin de favoriser l'accrochage de l'enduit de jointoiement qui sera plus tard appliqué dans cette zone lors de la mise en oeuvre de la plaque de plâtre (12). Cette surface rugueuse (25) correspondant au polygones défini par la ligne de l'encoche raidisseuse (23), la ligne de marquage de début d'aminci transversal (24) et les deux lignes de raccord d'amincis est obtenue soit par picotage, soit par moletage, soit par estampage, soit par frottage de ladite surface. Cette étape du procédé selon l'invention de réalisation des surfaces rugueuses (25) intervient en même temps que l'emboutissage des lignes de bosses (20).According to a variant of the method of the invention, the outer surface of the cream paper (3) corresponding to the future transverse thinned (14) is roughened to promote the adhesion of the grouting compound which will later be applied in this area during the implementation of the plasterboard (12). This rough surface (25) corresponding to the polygons defined by the line of the stiffening notch (23), the transverse thinning start marking line (24) and the two thinning connection lines is obtained either by pecking, either by knurling, by stamping, or by rubbing said surface. This step of the method according to the invention for producing the rough surfaces (25) takes place simultaneously with stamping the bump lines (20).

Selon le procédé de l'invention le contrôle de la hauteur d'aminci transversal "b" (29) et le contrôle de la largeur d'aminci transversal "a" (27) se fait par l'ajustement des paramètres suivants :

  • la hauteur de bosses "h" (45) en agissant sur la profondeur de l'emboutissage desdites bosses,
  • la sévérité de l'encoche raidisseuse (23) en agissant sur la profondeur plus ou moins forte de ladite encoche,
  • la sévérité de la ligne de marquage début d'aminci transversal (24) en agissant sur la profondeur plus ou moins forte de l'encoche conduisant à ce marquage début d'aminci transversal (24),
  • la tension mécanique "T" (47) du papier crème (3) en tendant ce dernier plus ou moins à l'aide des tendeurs dédiés.
According to the method of the invention the control of the transverse taper height "b" (29) and the control of the transverse taper width "a" (27) is done by adjusting the following parameters:
  • the height of bumps "h" (45) by acting on the depth of the stamping of said bumps,
  • the severity of the stiffening notch (23) acting on the greater or lesser depth of said notch,
  • the severity of the early transverse thinning marking line (24) by acting on the more or less deep depth of the notch leading to this transverse thinning start marking (24),
  • the mechanical tension "T" (47) of the cream paper (3) tending the latter more or less using the dedicated tensioners.

Le premier dispositif dénommé appareil suiveur emboutisseur (30) associé au procédé selon l'invention apparaissant fig 1 et détaillé dans les fig 3 et fig 4 procède à toutes les phases du procédé selon l'invention d'accostage et d'usinage à la volée et à cadence rapide du papier crème (3) avant que ce dernier ne s'engage sous le mélangeur (1). Ces dits usinages sont l'embossage des lignes de bosses (20), l'embossage des prolongements de ligne de bosses (28), le recouvrement d'enduit des bosses (16), le recouvrement d'enduit de la surface renforcée (21), la réalisation des encoches raidisseuses (23), l'encochage des lignes de marquage de début d'aminci transversal (24), l'encochage des lignes de raccord d'aminci (26), et la réalisation de la surface rugueuse (25).The first device referred to as a stamping follower device (30) associated with the method according to the invention appearing in FIG. 1 and detailed in FIGS. 3 and 4 proceeds to all the phases of the method according to the invention of docking and machining on the fly. and at a fast rate of the cream paper (3) before the latter engages under the mixer (1). These said machining operations are the embossing of the bump lines (20), the embossing of the bump line extensions (28), the coating of the bumps (16), the coating of the reinforced surface (21). ), producing the stiffening notches (23), notching the transverse taper start marking lines (24), notching the tapered connecting lines (26), and producing the rough surface ( 25).

Selon l'invention, l'appareil suiveur emboutisseur (30) mu par sa motorisation transmission (33) rattrape et se met quelques fractions de secondes à la même vitesse que le papier crème (3). Une fois l'appareil suiveur emboutisseur (30) à la même vitesse que le papier crème (3) la table inférieure (31) partie intégrante de l'appareil suiveur emboutisseur (30) fait un mouvement de monte et baisse au moyen des vérins et guides (34). Dans son mouvement de monte et baisse la table inférieure (31) vient comprimer le papier crème contre la table supérieure (32) également partie intégrante de l'appareil suiveur emboutisseur (30). Lors de cette compression du papier crème (3) les outils équipant la table inférieure (31) et la table supérieure (32) viennent faire leur effet et donc usiner localement le papier crème (3). Ainsi les poinçons (35) équipant la table supérieure (32) et les matrices (36) équipant la table inférieure (31) réalisent les lignes de bosses (20) et suivant une variante du procédé de l'invention les prolongements de lignes de bosses (28).According to the invention, the stamping follower device (30) driven by its transmission motor (33) catches and starts a few fractions of seconds at the same speed as the cream paper (3). Once the stamping follower device (30) at the same speed as the cream paper (3) the lower table (31) integral with the stamping follower device (30) moves up and down by means of the jacks and guides (34). In its movement up and down the lower table (31) compresses the cream paper against the upper table (32) also integral with the stamping follower device (30). During this compression of the cream paper (3) the tools equipping the lower table (31) and the upper table (32) come into effect and thus locally mill the cream paper (3). Thus the punches (35) equipping the upper table (32) and the dies (36) equipping the lower table (31) achieve the bumps lines (20) and according to a variant of the method of the invention the extensions of bumps lines (28).

Ainsi les estampeurs (37) équipant la table inférieure (31) et les contre estampeurs (38) équipant la table supérieure (32) réalisent les encoches raidisseuses (23), les lignes de marquage de début d'aminci transversal (24), les lignes de raccord d'amincis (26), le picotage de la surface rugueuse (25). Plus spécifiquement l'arête interne (39) de l'estampeur (37) produit l'encoche raidisseuse, l'arête externe (40) de l'estampeur (37) produit les lignes de marquage de début d'aminci et les lignes de raccord d'amincis (26), les picots (41) de l'estampeur produisent les surfaces rugueuses (25).Thus the stampers (37) equipping the lower table (31) and counter stamps (38) equipping the upper table (32) perform the stiffening notches (23), the transverse thinning start marking lines (24), the thinning connection lines (26), potting the rough surface (25). More specifically, the inner edge (39) of the stamper (37) produces the stiffening notch, the outer edge (40) of the stamper (37) produces the thinned start marking lines and the the thimbles (41) of the stamper produce the rough surfaces (25).

Immédiatement après les opérations d'emboutissage et de marquage du papier crème (3), les buses (44) situées entre les poinçons (35) projettent sur les bosses (16) et sur la surface renforcée (21) l'enduit (15) dont la fonction principale est la tenue et le renfort des bosses (16).Immediately after the operations of stamping and marking the cream paper (3), the nozzles (44) located between the punches (35) project on the bumps (16) and on the reinforced surface (21) the coating (15) whose main function is holding and reinforcing bumps (16).

Selon l'invention, l'appareil suiveur emboutisseur (30) en position "O2" lors des usinages du papier crème (3) revient rapidement en arrière en position "O1", un nouveau cycle d'accostage et d'usinage du papier crème (3) reprend à un pas "p" (48) du précédent usinage du papier crème (3) et ainsi de suite le cycle se répète. La motorisation transmission (33) est associée à une électronique adaptée, et au générateur d'impulsions (42) qui lui mesure en permanence le défilement du papier crème (3). Cette motorisation transmission (33) peut ainsi accoster à fréquence rapide le papier crème (3) et en permettre tous les pas "p" (48) les usinages nécessaires au procédé selon l'invention.According to the invention, the stamping follower device (30) in position "O2" when machining cream paper (3) quickly returns back to position "O1", a new cycle of docking and machining of cream paper (3) resumes at a step "p" (48) of the previous machining of the cream paper (3) and so on the cycle is repeated. The transmission motor (33) is associated with an adapted electronics, and the pulse generator (42) which permanently measures the scrolling of the paper cream (3). This motor transmission (33) can thus dock fast frequency cream paper (3) and allow all the steps "p" (48) machining necessary for the method according to the invention.

Le calcul de cet intervalle "p" particulier au procédé de l'invention est présenté dans l'exposé du procédé selon l'invention.The calculation of this interval "p" particular to the process of the invention is presented in the description of the process according to the invention.

Selon une variante de l'appareil suiveur emboutisseur (30), les poinçons (35) et les matrices (36) permettent par leurs formes et contre formes de réaliser des bosses (16) qui sont soit hémisphériques soit pyramidales soit coniques soit encore en ½ lune sans que ces formes soient limitatives.According to a variant of the embossing follower device (30), the punches (35) and the dies (36) make it possible, by their shapes and forms, to make bumps (16) which are either hemispherical or pyramidal or conical or else in ½ moon without these forms being limiting.

Selon le procédé de l'invention on protège les bosses (16) lors de leurs passages dans la zone située de la table de formage (5) au conformateur (7). Pour cela, dans la dite zone toutes les aspérités de la table de formage (5), tous les points d'accrochage (17) des guides et règles de formage sont supprimés. Des rainures sont aménagées sur l'étaleur (6), ainsi cet étaleur (6) généralement une table vibrante ou des rouleaux batteurs battent le papier crème (3) pour étaler le liant hydraulique (2) sans affecter les bosses (16) qui elles passant dans les rainures passent sans être touchées par l'étaleur (6). Ainsi la dite zone située de la table de formage (5) au conformateur (7) n'affecte en rien les lignes de bosses (20).According to the method of the invention protects the bumps (16) during their passage in the area of the forming table (5) to the shaper (7). For this, in the said area all the asperities of the forming table (5), all attachment points (17) of the guides and forming rules are removed. Grooves are provided on the spreader (6), so that the spreader (6) generally a vibrating table or drumming rolls beat the cream paper (3) to spread the hydraulic binder (2) without affecting the bumps (16) which they passing through the grooves pass without being touched by the spreader (6). Thus the said zone located from the forming table (5) to the shaper (7) in no way affects the bump lines (20).

Le deuxième dispositif assurant la coupe au droit des empreintes (19) est constitué du détecteur d'empreinte (18) à distance "d" de la cisaille (2) et d'une électronique adaptée qui connaissant la vitesse "V" de la bande composite (45) donne l'ordre à la cisaille (11) de sectionner la bande composite (10) au droit de l'empreinte double pentes (19).The second device ensuring the cut right fingerprints (19) consists of the fingerprint sensor (18) at a distance "d" of the shears (2) and a suitable electronics that know the speed "V" of the band Composite (45) instructs the shear (11) to sever the composite strip (10) at the right of the double slope footprint (19).

Claims (10)

  1. Method of continuous production of plaster boards (12) in which two sheets of cardboard-type paper, one constituting facing paper (3) and the other gray or backing paper (4), enclose in a former (7) a plaster-based hydraulic binder (2) creating a composite strip (10) which hardens on two hardening belts (8) and (9) around the edge of which are two tapered strips for the making-up of the longitudinal tapered edges (13), characterized in that it consists of:
    - embossing the facing paper (3) along lines of protuberances (20) transverse and perpendicular to the direction of unwinding of the facing paper (3) and projecting below said facing paper (3), said lines of protuberances (20) being produced:
    - over a length "1" (49) equal to the width around all of the plaster board (12) minus the sum of the widths of the 2 longitudinal tapers (13),
    - in a zone necessarily situated before the mixer (1) and former (7),
    - at a high rate, on-the-fly, and respecting a precise step "p" (48) between the lines of protuberances (20) corresponding to the future length of the plaster board (12),
    - notching the facing paper (3), simultaneously with the notching of the lines of protuberances (20), along two continuous straight lines of reinforcing notches (23), said lines of reinforcement notches (23) being realized:
    - on the outside of the facing paper (3),
    - on either side of each line of protuberances (20),
    - with the same length as the lines of protuberances (20)
    - parallel to and centered vis-à-vis the lines of protuberances (20),
    - protecting the lines of protuberances (20) against pulling out, catching or deformation until the crossing of the former (7),
    - allowing said lines of protuberances (20) projecting below the facing paper (3) to cross the former (7), and to locally reduce the quantity of hydraulic binder (2) enclosed between the facing paper (3) and the gray or backing paper (4),
    - allowing said lines of protuberances (20) projecting below the facing paper (3) to rest on the 2 hardening belts (8) and (9), locally raising said facing paper (3) and generating the double-slope imprint (19),
    - allowing the double-slope imprints (19) to cross the 2 hardening belts (8) and (9),
    - cutting the composite strip (10) using the shears (11) at the level, in the center and in the axis of each of the double-slope imprints (19) thus created.
  2. Method according to claim 1, characterized in that all the insides of protuberances (16) and the upper and horizontal surfaces of the facing paper (3) between the protuberance (16) and the reinforcing notches (23), said surface being called reinforced surface (21), are covered by a layer of coating (15), on-the-fly applications of said coating (15) being realized immediately after the embossing operation of the lines of protuberances (20), said coating (15) itself characterized in that it consists of:
    - increasing the mechanical strength of the lines of protuberances (20),
    - making the lines of protuberances (20) impermeable,
    - making the lines of protuberances (20) tight vis-à-vis the hydraulic binder (2),
    - guaranteeing a good bonding of the hydraulic binder (2) and the facing paper (3) at the reinforced surface (21).
  3. Method according to claim 1 or 2, characterized in that the lines of protuberances (20) are extended at each of their ends over a length equal to the width of the longitudinal tapers (13) by an extension of the line of protuberances (28) with protuberances (16) the protuberance height "h" (45) of which decreases as said line of protuberances (20) approaches the outside edge of the facing paper (3), said extension of the line of protuberances (28) during the crossing of the hardening belts (8) and (9) coming to rest on the tapered strips, the function of said tapered strips being the making-up of the longitudinal tapers (13).
  4. Method according to one of claims 1 to 3, characterized in that the facing paper (3) is premarked by a so-called taper start marking line (24), corresponding to the future start of the transverse taper (14), said taper start line (24) being the same length as and parallel to the line of protuberances (20) and af a distance "a" from the latter, said distance "a" being equal to the sought width "a" of the transverse taper (27), this premarking involving a light notching of the facing paper (3) and occurring at the same time as the embossing of the lines of protuberances (20).
  5. Method according to claim 4, characterized in that the facing paper (3) is premarked by a so-called tapers connection line (26) corresponding to the meeting of the longitudinal taper (13) and the transverse taper (14), said tapers connection line (26) starting from the end of the line marking the start of the transverse taper (24) and ending at the line of reinforcing notches (23) at an angle "c" (46) of 45°, said premarking involving a light notching of the facing paper (3) and occurring at the same time as the embossing of the lines of protuberances (20).
  6. Method according to one of claims 1 to 5, characterized in that the outside surface of the facing paper (3) corresponding to the future transverse taper and situated in the polygon defined by the line of the reinforcing notch (23), the line marking the start of the transverse taper (24) and the two tapers connection lines (26) is roughened by pricking, knurling, embossing or by chafing, this stage of the method according to the invention of realizing the rough surface (25) occurring at the same time as the embossing of the lines of protuberances (20).
  7. Method according to any one of claims 1 to 6, characterized in that the height "b" of the transverse taper (29) and the width "a" of the transverse taper (27) are regulated by adjusting the following parameters:
    - the protuberances height "h" (45)
    - the steepness of the reinforcing notch (23)
    - the steepness of the line marking the start of the transverse taper (24)
    - the mechanical tension of the facing paper (3).
  8. Apparatus for implementing the method according to one of claims I to 7 constituted by a production line for plaster boards (12) in which two sheets of cardboard-type paper, one constituting facing paper (3) and the other gray or backing paper (4) unwind and enclose in a former (7) a plaster-based hydraulic binder (2) and constitute a composite strip (10) which hardens on two hardening belts (8) and (9) fitted with tapered strips for the making-up of longitudinal tapers (13), and a shearing apparatus situated after the hardening belts (8) and (9) the function of which is to cut the composite strip (10) at the level, in the center and in the axis of the double-slope imprints (19), characterized in that it also comprises the following means:
    - a embossing tracker (30) situated in a zone just before the mixer (1) having means for:
    - berthing on-the-fly the facing paper (3) at a predefined step "p" (48).
    - embossing said facing paper (3) to produce lines of protuberances (20),
    - notching said facing paper (3) to produce lines of reinforcing notches (23),
    - embossing said facing paper (3) to produce the extensions of the line of protuberances (28),
    - notching said facing paper (3) to produce lines marking the start of the transverse taper (24) and tapers connection lines (26),
    - roughening the rough surface (25) corresponding to the future transverse taper (14).
  9. Apparatus according to claim 8, characterized in that the embossing tracker (30) is constituted by a lower table (31) situated below the facing paper (3) and an upper counter-table (32) situated above the facing paper (3), said lower table (31) being fitted with jacks and guides (34), dies (36), stampers (37), each of said stampers having an inner ridge (39) and an outer ridge (40) and needles (41), said upper table (32) being fitted with punches (35), a counter-stamper (38), nozzles (44) for coating (15) and a pulse generator (42), both of the two said lower (31) and upper (32) tables being an integral part of the embossing tracker (30), itself driven by the motor and transmission system (33).
  10. Apparatus according to claim 8, characterized in that the shearing apparatus is constituted by shears (11), an imprint detector (18), said imprint detector (18) being situated at the known distance "d" from the shears (11) and a shears (11) cut calculator.
EP03747485A 2002-05-02 2003-05-02 Method of producing plaster boards comprising four tapered edges Expired - Lifetime EP1507636B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0205490A FR2839275B1 (en) 2002-05-02 2002-05-02 METHOD AND DEVICE FOR MANUFACTURING PLASTERBOARDS HAVING FOUR THIN EDGES
FR0205490 2002-05-02
PCT/FR2003/001373 WO2003092976A1 (en) 2002-05-02 2003-05-02 Method of producing plaster boards comprising four tapered edges

Publications (2)

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EP1507636A1 EP1507636A1 (en) 2005-02-23
EP1507636B1 true EP1507636B1 (en) 2006-04-26

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EP03747485A Expired - Lifetime EP1507636B1 (en) 2002-05-02 2003-05-02 Method of producing plaster boards comprising four tapered edges

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US (1) US20060144497A1 (en)
EP (1) EP1507636B1 (en)
AT (1) ATE324239T1 (en)
AU (1) AU2003249388A1 (en)
DE (1) DE60304858D1 (en)
FR (1) FR2839275B1 (en)
PL (1) PL372802A1 (en)
WO (1) WO2003092976A1 (en)

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AR038609A1 (en) 2002-02-26 2005-01-19 Lafarge Platres PROCEDURE OF MANUFACTURE OF PLATES BASED ON HYDRAULIC BINDER, INSTALLATION OF PRODUCTION OF SUCH PLATES AND APPARATUS FOR THE REALIZATION OF A FOOTPRINT
FR2838370B1 (en) 2002-04-10 2004-05-28 Lafarge Platres PROCESS FOR THE MANUFACTURE OF PLASTERBOARDS WITH FOUR THIN EDGES
JP2007503334A (en) * 2003-08-25 2007-02-22 ラファルジュ プラトル Board based on hydraulic binder with sedge, method for manufacturing board based on hydraulic binder, and method for constructing line and internal structure for manufacturing such board
DE102004042143B3 (en) * 2004-08-31 2006-02-16 Eisenmann Maschinenbau Gmbh & Co. Kg Process for the production of building elements, in particular building boards, from solid waste
US8123991B2 (en) * 2005-11-09 2012-02-28 John S Conboy System and method for making wallboard
FR2905965B1 (en) * 2006-09-15 2013-11-29 Placoplatre Sa IMPROVEMENT CONCERNING A PLATING PLATE, IN PARTICULAR A PLATE OF PLASTER.
WO2011020146A1 (en) * 2009-08-20 2011-02-24 Dragan Haris Profiled plasterboard
AU2012396410A1 (en) * 2012-12-12 2015-06-04 Knauf Gips Kg Clocked regulation of the amount of plaster paste
US11433645B2 (en) 2013-12-30 2022-09-06 Saint-Gobain Placo Sas Building boards with increased surface strength
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Also Published As

Publication number Publication date
PL372802A1 (en) 2005-08-08
EP1507636A1 (en) 2005-02-23
ATE324239T1 (en) 2006-05-15
AU2003249388A1 (en) 2003-11-17
US20060144497A1 (en) 2006-07-06
FR2839275A1 (en) 2003-11-07
WO2003092976A1 (en) 2003-11-13
FR2839275B1 (en) 2004-06-04
DE60304858D1 (en) 2006-06-01

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