FR2886576A1 - Armed band producing method for building board, involves separating tape bundles of strip to provide metallic tapes and to stick tapes on paper tape bundle so as to obtain armed band, where bundles are heated before and after they are stuck - Google Patents

Abstract

The method involves providing a steel strip (12), wound on a bobbin, and simultaneously unwinding the strip and a paper tape bundle (22). The strip is continuously slit to obtain two slit metallic tape bundles (16), and the bundles are separated to provide a pair of metallic tapes and to stick the tapes on the paper tape bundle so as to obtain an armed band. The bundles are heated before they are stuck so as to evaporate residual water contained in the bundles. The bundles are also heated after they are stuck.

Description

Process for producing armed bands

  The present invention relates to a method for producing reinforced strips for the assembly of building panels in the field of building.

  These armed bands have two rigid half-edges intended to be folded longitudinally towards each other to form an edge, and they are adapted to be applied astride a lo angle formed by two building panels. They consist of a paper ribbon, on which is glued a pair of metal ribbons, the ribbons being stuck away from each other and parallel to each other, so as to allow a bend between the two metal ribbons for thus forming said edge.

  The known methods for producing such armored strips consist of jointly unwinding a reel of paper tape and two reels of metal ribbons, matching the two metal ribbons and driving the paper ribbon and the pair of metal ribbons, one to the other, so as to stick the metal ribbons on the paper tape at a distance from each other and parallel to each other.

  A disadvantage of this production process lies in the relative speed of drive of the two metal ribbons and in their longitudinal voltage difference which can result when gluing on the paper ribbon. Indeed, if the tension of the two ribbons is different, the armed band obtained then tends to twist when it is unrolled.

  In addition, the reels of metal ribbons are relatively bulky, and if one seeks to increase productivity by performing parallel a plurality of armed bands, the area occupied on the ground quickly becomes unacceptable.

  A problem which then arises, and which the present invention seeks to solve, is to provide a method for producing reinforced bands which makes it possible not only to supply at least one pair of metal ribbons whose longitudinal tension of each of the ribbons is substantially equivalent. but also which allows to restrict the space necessary for the production of these armed bands.

  For this purpose, the present invention proposes a method for producing armed bands, said armed bands having two rigid half-edges intended to be folded longitudinally towards each other to form an edge, said armed bands being adapted to be straddled at an angle formed by two building boards, said method being of the type in which at least one paper tape and at least one pair of metal ribbons are provided and said one to the other is pulled together paper tape and said pair of metal ribbons, the metal ribbons of said pair of ribbons being glued to said paper ribbon at a distance from each other and parallel to each other; the process according to the invention comprises the following steps: a metal strip is provided; simultaneously driving said metal strip and said paper tape; said metal strip is continuously split to obtain two split metal half-strips; and, said two split metal half-strips are moved apart to provide said pair of metal strips and so as to stick said metal strips on said paper strip, whereby an armed band is obtained.

  Thus, a feature of the invention lies in the production of a pair of metal strips directly from a metal strip wound on a coil, the metal strip being unwound together with the paper tape and split into two half-strips to then, the two metal ribbons thus obtained are glued on the paper tape. In this way, the metal ribbons are driven at the same speed which is that of the unwinding speed of the metal strip and the problems of longitudinal differential tension no longer arise. In addition, there is no need to have two reels but simply a single coil of metal tape, which reduces the footprint on the ground.

  Moreover, and according to a particularly advantageous embodiment of the invention, a plurality of paper ribbons are provided, said ribbons of paper being driven in parallel together, and a metal strip is provided, said metal strip being split into a plurality of pairs of metal tapes to respectively bond each of said pairs of metal tapes to each of said tapes of paper. Thus, by means of a single metal strip wound on a coil for which the surface congested on the ground is relatively small, it is possible at the same time to produce a plurality of armed strips, for example six, by choosing a width of the strip enabling twelve ribbons to be produced.

  Moreover, the longitudinal tensions of the metal ribbons of all the pairs of metal ribbons split from the single strip are substantially equivalent, which makes it possible not only to produce a plurality of armed strips without internal differential stress and therefore not to twist. not when unrolled, but also to simultaneously produce armed bands whose tensions of metal ribbons are identical.

  In addition, the split metal half-strips are advantageously heated before bonding so as to evaporate the residual water contained in the strip, and especially, to evaporate the oil residues that the slitting operation has caused or that previously existed. Thus, the bonding between the paper ribbon and the metal ribbons will be easier and above all more effective.

  Advantageously, said slotted metal half-strips are guided in an accumulator and said metal strip is slit at a speed regulated by the quantity of metal half-strips accumulated in said accumulator so as not to have to synchronize the speed of the unwinding means but to simply control the slitting speed at the actual gluing speed. Indeed, although the speeds of the drive means, at the slitting and gluing level can be synchronized, it is preferable to enslave these speeds to the quantities of metal tapes unrolled because they undergo dimensional changes during the production process and especially during heating. In addition, although the aforementioned drive means are directly engaged with the metal strip to drive it in translation, it is not excluded that a shift can occur especially if the metal strip in question was braked unexpectedly. Also, the simple synchronization of the drive means would not ensure optimal training of the metal ribbon. In addition, the synchronization means are more complex to implement and therefore more expensive.

  In addition, the paper tape is advantageously driven in baffle means for regulating the longitudinal tension of said paper tape. This is to obtain an armed band in which the longitudinal tension of the paper ribbon and metal ribbons is regular during the gluing and during the production to ensure an identical and constant quality of the armed band produced .

  The paper ribbon is also advantageously heated before being glued with the metal ribbons so, again, to evaporate the water that it could contain. This operation also contributes to improving the speed and strength of metal / paper bonding.

  In addition, for this bonding is provided a glue which is extruded on said paper tape before applying said metal tape against said paper tape and pressing together to bond said metal tape and said paper tape. Thus, the coating of the glue, in liquid form, is rationalized with respect to the usual methods by a lick roller. In addition, and in order to better further adjust the longitudinal tension in the split metal strips and therefore in the metal strips, they are applied a longitudinal tension by passing them through two adjustable pads driven one to the other. other by force by elastic means. The metal strips are thus frictionally driven through these two adjustable pads which must be adjusted to obtain the same longitudinal tension between the metal strips.

  Furthermore, and preferably, said pair of metal ribbons and said paper ribbon are heated after gluing them together in order to accelerate the setting speed of the glue, whether it is to evaporate a solvent and / or to accelerate a rate of crosslinking of a polymer.

  According to a particularly advantageous embodiment of the invention, a determined quantity of said reinforced strip is simultaneously wound on a first support comprising a driving shaft after having glued together said paper tape and said metal strips, and a second support also including a driving shaft, to said first support substantially continuously, when said determined quantity of armed tape has been wound, after cutting and connecting said armed band to said second support, whereby said amount of armed band wound and cut can be packaged in masked time. Thus, the two motor shafts are intended to be permuted automatically when the determined quantity of armed band has been rolled up. For this purpose, and in order not to interrupt the upstream operations of production, slitting and bonding, it is expected, on the one hand, a zone of accumulation of armed bands, before winding, and is provided means for cutting and to seize the armed band. In this way, one accumulates armed band in the accumulation zone while one stops the winding. Then, the armed band is cut near the determined quantity of armed band wound in roll, then the motor shafts are exchanged, and the free end of the armed bands, upstream side, is seized and engaged in the motor shaft. swapped. Then, the permuted motor shaft is rotated, to firstly wind the accumulated army band in the accumulation zone, then the armed band directly produced. Thus, without interrupting the production process, the conditioning of the determined quantity of armed tape wound on the other motor shaft which is then released, can be performed.

  Other features and advantages of the invention will appear on reading the following description of a particular embodiment of the invention, given by way of indication but not limitation, with reference to the accompanying drawings in which: Figure 1 is a block diagram of the various steps of the method of producing armed bands according to the invention; - Figure 2 is a schematic perspective view of a device for carrying out a final step of the production process illustrated in Figure 1.

  FIG. 1 very schematically illustrates the various processing stations corresponding to the various steps of the method for producing armed bands in accordance with the invention.

  Thus, first of all a strip of steel wound in a coil is provided, said coil being installed vertically in a reel 10, the winding axis of the coil then being oriented horizontally. The strip has, for example a standard width of 138 mm. Steel strips of this dimension coil, are usually marketed by steelmakers.

  A portion 12 of the strip which unfolds progressively through the reel passes firstly a slitting station 14 which allows to cut longitudinally the strip into six pairs of metal strips, here of a width of eleven millimeters and forming a first beam 16 at the exit of this slitting station 14. Given the width of the strip, two ribbons of drops of a width of 3 mm each are wound apart.

  This station comprises two sets of discs, the discs being of equal thickness corresponding to the width of 11 mm of the ribbons, nested one inside the other and respectively mounted on two parallel shafts. The strip is engaged and driven by force between the two series of discs which turn as the strip advances the cut into ribbons.

  The first bundle 16 of metal strips then passes through a heating tunnel 18 which notably makes it possible to evaporate the residual water from the coil covering the surface of the strip, but also makes it possible to evaporate the oil residues that remain after slitting. in ribbons. Thus, the surface of the metal ribbons being dried and degreased, the quality of the subsequent bonding will be improved. In addition, this operation makes it possible to supply the metal ribbons at a stationary temperature, whatever the external temperature, which then allows good reproducibility of the bonding process between day and night and summer and winter.

  Then, the first bundle 16 of metal strips that is found after the heating tunnel 18 is engaged in a voltage regulator 20 for applying a longitudinal voltage identical to all the metal strips of the first bundle 16. For this, each metal ribbons are frictionally held between two pads, driven towards each other by means of elastic means adjustable by screws. In this way, the friction force exerted on each of the metal ribbons is adjustable and adjustable at the same intensity for each of the ribbons of the six pairs of metal strips of the beam 16.

  Then, and this is where we just realize precisely the armed bands in parallel, we glue together the six pairs of metal ribbons respectively with six paper ribbons guided in translation and forming a second beam 22.

  This second bundle 22 of six paper tapes comes from six coils 24 installed in a reel 25 located downstream of the production process. The paper ribbons here have a width of 51 mm. The second beam 22 of the six paper ribbons is therefore driven in counter-current translation to the assembly station 26. The latter has a lower portion through which the second beam 22 passes, firstly through a heating tunnel paper 28 then through a paper tension regulator 30 formed of three parallel baffle rollers.

  The paper heating tunnel 28 reduces its water content for better subsequent bonding. In addition, the paper tension regulator 30 is adjustable by changing the relative position of the three rollers so as to adjust the longitudinal tension of the six paper tapes.

  The second beam 22 is then guided, still against the current, through an adhesive coating station 32. This station comprises a battery of nozzles, six nozzles here, one per paper ribbon, each of the nozzles being adapted to cold extruding dispersed glue or not, in a solvent on one side of the paper ribbons and a width straddling the center line of each of the paper ribbons. In order to coat a given amount of glue per unit of paper surface, the glue pressure in the nozzles is electronically slaved to the running speed of the paper ribbons and therefore to the speed of production of the web.

  As soon as the paper strips of the second bundle 22 are coated with adhesive, they are then guided this time, in the direction of travel of the first bundle 16 of metal strips, by means of return, and each of the paper strips receives on the surface glued, a pair of metal ribbons at the assembly station 26. On each of the paper ribbons, the metal ribbons are applied at a distance from each other and substantially on either side of a line median of the paper ribbons and this, parallel to each other. As soon as the metal ribbons are respectively applied to the paper ribbons, they are compressed together between pressure rollers to increase the contact force between the two and thus increase the bonding force.

  An armed band 33 is thus produced, and by extension here, the six armed strips made in parallel, are guided through a final heating tunnel 34 to contribute to the evaporation of the solvent from the glue and perfect in this way, the bonding. The armed bands are then marked and dated, for example by means of an ink jet nozzle system or by means of ink pads, and this through a marking station 36.

  Then, the armored strips pass through a pliers tool 38 and a cutting tool 40 to join a winding shaft 42 forming part of an automatic packaging assembly 44 which will be described hereinafter with reference to FIG. 2.

  It is difficult to control the slitting speed of the strip 12 at the slitting station 14 as a function of the bonding speed at the assembly station 26, since the dimensions of the metal strips of the first beam 16 are liable to vary longitudinally with the heating. Also, there is provided a not shown speed controller, after the slitting station 14, adapted to form a corrugation with the beam 16 of metal ribbons, between two high points of passage. The beam 16 being guided towards a low point between the two high points, where it extends freely; the difference in level is measured between the low point of the first bundle 16 of metal strips and the high point, so as to regulate the slitting speed as a function of this difference in level.

  As for the automatic packaging assembly 44 that is found illustrated in FIG. 2, after the pliers tool 38 and the cutting tool 40, it enables continuous, and especially automatic, conditioning of the armed bands. Also, a programmable controller possibly connected to a microcomputer, allows to control and control the entire process.

  Firstly, the gripper tool 38 makes it possible to grasp all six of the armed strips, and to drive them in translation by means of a carriage 46, downstream along F. The conditioning unit 44 comprises also a barrel device 48 of axis A horizontal and perpendicular to the armed bands in production. This device 48 is equipped with two winding shafts, one 42 described above, the other 49 diametrically opposite. These motor shafts 42, 49 are equipped with two mandrels, a first 50 and a second 52, projecting parallel to the horizontal axis A and perpendicular to the armed bands in production; the mandrels 50, 52 extending perpendicularly to the axis of travel of the armed bands so that they can all be wrapped around. In addition, each of the mandrels 50, 52 has a longitudinal slot adapted to receive one of the free ends of cut-off armed strips, and a clamping cam to block these cut free ends.

  Thus, in a start-up phase, while the two mandrels 50, 52 are empty, the barrel 48 is rotated so that the first mandrel, 50, is cut, at said longitudinal slot, by the mean plane defined by the armored bands that pass through the pliers tool 38. Then, the gripper 38 which grips the six armed strips is driven in translation towards the mandrel 50 to thread the cut free ends of the armed strips into said longitudinal slot towards the clamping cam. The clamping cam is then controlled to clamp the cut free ends of the armed strips in a fixed position relative to the mandrel 50. The clamp tool 38 is then deactivated and returns to its initial position, while the mandrel 50 is rotated. thanks to its motor shaft, so as to drive the six armed bands in translation and to wrap around the mandrel 50 forming six rollers 56 of armed band.

  When the desired quantity of armed band has been wound on the mandrel 50, its rotation ceases, a pressing arm 58 is applied against the armed bands on the rollers 56, the cutting tool 40 and the gripper tool 38 are activated in order to keep the armed bands in a fixed position and to cut them off. Then, the barrel 48 is rotated 180 to swap the two mandrels 50 and 52, the new cut free ends of the armed bands then being connected again to the second mandrel 52 in position, and the winding can then restart while the six rollers 56 of the first mandrel 50 can be extracted by deactivating the clamping cam, in masked time since during this time the production of armed bands continues. As soon as the desired amount of armed band is reached on the second mandrel 52, and the first mandrel 50 is released from all its rollers 56, the same operation of permutation of the two mandrels can then be performed.

  In addition, in order not to stop the production process of the armored bands, during cutting and permutation of the mandrels 50,52, a system of accumulation of produced arm bands is provided after the final heating tunnel 34. accumulation system, consists for example of two trains of five superimposed rollers whose relative position is variable, the armed bands being threaded between io said rollers of a train of rollers to the other set of rollers, alternatively to constitute five round trips. Thus, when the gripper tool 38 is active and the permutation of the mandrels 50, 52 is in progress, the cut end of the armed bands is then immobile, and the aforementioned roll trains then deviate from the other to allow the accumulation of armed bands whose production continues. As soon as the mandrels 50, 52 are exchanged and the winding starts again, the quantity of reinforced bands accumulated between the two roller trains is then wound on the operating mandrel whose peripheral speed is greater than the linear speed of gluing. armed bands, while the two sets of rollers come closer to each other.

Claims (10)

  A method of producing armored bands (33), said armored bands having two rigid half-edges intended to be folded longitudinally towards each other to form an edge, said armored bands (33) being adapted to be applied to on an angle formed by two building boards, said method being of the type in which at least one paper strip (22) and at least one pair of metal strips (16) are provided and the one is drawn together. the other said paper ribbon and said pair of metal ribbons, the metal ribbons of said pair of ribbons being glued to said paper ribbon at a distance from each other and parallel to each other; characterized in that it comprises the following steps: - a metal strip (12) is provided; said metal strip (12) and said paper strip (22) are simultaneously driven; said metal strip (12) is continuously split to obtain two split metal half-strips (16); and, - said two split metal half-strips are separated to provide said pair of metal strips and so as to stick said metal strips on said paper strip (22), whereby an armed strip (33) is obtained.   2. A method of producing reinforced bands according to claim 1, characterized in that a plurality of paper ribbons (22) are provided, said ribbons of paper being driven in parallel together, and in that a metal strip is provided ( 12), said metal strip being split into a plurality of pairs of metal strips (16) so as to respectively bond each of said pairs of metal strips to each of said paper strips.   3. A method of producing reinforced bands according to claim 1 or 2, characterized in that heating the split metal strips (16) before bonding.   A method of producing reinforced strips as claimed in any of claims 1 to 3, characterized in that said paper tape (22) is driven into baffle means (30) to regulate the longitudinal tension of said paper tape. (22).   5. A method of producing armed bands according to any one of claims 1 to 4, characterized in that said heating strip of paper (22) is heated before gluing it with said metal strips (16).   6. Process for producing reinforced bands according to any one of claims 1 to 5, characterized in that extrude glue on said paper ribbon (22) before applying said metal strips (16) against said ribbon of paper to glue together said metal ribbons and said paper ribbon.   7. A method of producing reinforced bands according to any one of claims 1 to 6, characterized in that a substantially identical longitudinal tension is applied to each of the split metal half-strips (16).   8. Process for producing reinforced bands according to any one of claims 1 to 7, characterized in that heating said pair of metal strips (16) and said paper tape (22) after gluing them together.   9. A method for producing armed bands according to any one of claims 1 to 8, characterized in that a predetermined quantity of said armed band (33) is wound simultaneously on a first support (50) after having glued together said paper tape (22) and said metal ribbons (16), and in that a second support (52) is substituted for said first support (50) substantially continuously, when said determined amount of armed tape has been rolled up, after having cut and connected said armed band (33) to said second support (52), whereby said amount of wound and cut armed band is adapted to be packaged in masked time.   10. A method of producing reinforced bands according to any one of claims 1 to 9, characterized in that said slotted metal half-strips (16) are guided in an accumulator and that said metal strip is split into a speed regulated by the amount of split metal half-strips (16) accumulated in said accumulator. io