FR2576541A1 - PROCESS AND INSTALLATION FOR THE CONTINUOUS MANUFACTURE OF ADHESIVES AND PRODUCT ARISING FROM THE IMPLEMENTATION OF THIS PROCESS - Google Patents

Abstract

1. Method for the continuous manufacturing of wood laminated panel comprised of a stack of glued layers each of which is made of wood plates joined end to end, which consists in : a- conveying a first layer (1) toward a first glueing station (12) where a portion (1a) of this layer is coated with glue, b- simultaneously : 1. conveying the glue-coated portion (1a) of the first layer (1) toward a first stacking station (13) where a second layer is deposited on the first one, and 2. carrying on the conveying of the first layer (1) toward the first glueing station (12) where a further portion (1b) of this layer is coated with glue, and c- hardening the glue by any means appropriate to the nature of said glue, and d- simultaneously : 1. conveying the assembly (1a, 2a) resulting from step b1. toward a second glueing station (14) where the second layer (2) is coated with glue, 2. conveying the glue-coated portion (1b) of the first layer (1) resulting from step b2. toward the first stacking station (13) where a second layer is deposited on the first one, and 3. carrying on the conveying of the first layer (1) toward the first glueing station (12) where another further portion (1c) of this layer is coated with glue, and e- simultaneously : 1. conveying the assembly (1a, 2a) resulting from step d1. toward a second stacking station (15) where a third layer (3) is deposited on the second one, 2. to 4. submitting to steps d1. to d3. the product resulting of steps d2. and d3., respectively, as well as the next portions of the first layer, and f- carrying the alternating succession of glueing and stacking steps in as many stations as needed for obtaining a product having the desired number of layers, so that one conducts simultaneously the prolongation of each layer and the increase of the layer number while the product is conveyed toward the glue-hardening station.

Description

The subject of the present invention is a method and an installation for

  continuous manufacturing of glulam is an eml) pounding of collared d (e layers each of which is

  formed of strips of wood joined end to end.

  The invention also relates to the glulam from the placing

implementing this process.

  At the present time, the manufacture of glued laminates is done piece by piece, over a length depending on

the installation used.

  It would however be desirable to manufacture a glued laminate continuously, thereby increasing the production yield and making it possible to obtain products of unlimited length.

  This is the goal that the invention set for itself.

  This object is achieved in the sense that the invention proposes a method which consists in: a- routing a first layer of lamellae to a first gluing station where an area of this layer is coated with glue; bsimultaneously: 1. to route the glued area of the first layer to a first stacking area where a second layer is deposited on the first, and 2. to continue the routing of the first layer 2. to the first post gluing o a subsequent area of this layer is coated with glue c- simultaneously: 1. to route the assembly from step bl. to a second gluing station where the second layer is coated with glue, 2. to route the glued area of the first layer from step b2. towards the first stacking zone o a second layer is deposited on the first, and 3. to continue the routing of the first layer towards the first gluing station o a new subsequent zone of this layer is coated with glue, d - simultaneously: I1. to achIci i rie r onstemb lc issit It l'd ae cl. to a second stacking station where a third layer is deposited on the second, and 2. to 4. to be submitted to the steps described under el. to c3. the product respectively from steps c2. and 'c3. as well as the rest of the first layer, e- to continue the alternating succession - of gluing and stacking steps at as many stations as necessary to obtain a product having the desired number of layers, and f- to harden the glue by any means suitable for the

nature of this glue.

  We understand that, in this way, we proceed simultaneously

  * in particular to the extension of each layer and to the increase

  tion of the number of layers while the product is conveyed

  to the glue hardening area.

  To ensure that the lamellae placed end to end to extend each layer used in the composition of the glulam are firmly applied against the lamella preceding them in the layer in question, the method according to the invention advantageously consists in conveying each new lamella of a layer at a speed slightly higher than the speed of transport of the support on which

rests said layer.

  Preferably, the method further comprises: e'- subjecting the stack of layers from step e- to vertical compression, prior to the implementation of step f- and during this implementation. This vertical compression can be obtained using rollers

  pressure subjected to hydraulic or pneumatic cylinders

  ques. For step f-, that is to say the step of hardening the adhesive, the stacking of layers may be conveyed in a drying tunnel, the length of which will depend on the time necessary for the adhesive to harden and of the speed of

  conveying of the glulam. The time required for hardening

  the glue will depend on the type of glue and the

  means used in the tunnel (temperature, radius-

  etc.) for drying.

  The glued laminate which emerges from the drying tunnel is a raw product and the process will also consist of: g- putting it alongside the finish by planing

its four faces.

  Then the glue-laminate obtained can be cut with

  request with, possibly, prior sawing longitu-

  dinal in beams of smaller sections.

  The installation for implementing the method described above comprises: - a conveyor plumb with which are provided: 15. a station for depositing a first layer of lamellae on the conveyor a gluing station a zone of said first layer a stacking station of a second layer on the glued area of the first layer a sizing station of the second layer stacked on the first layer, then an alternating succession of n stacking stations and n-1 gluing stations for the production of a glued laminate of n + 2 layers, and

  - an adhesive hardening area.

  For the reasons expressed with regard to the process, the installation further comprises: - means ensuring for each new strip added in the extension of a layer a speed of movement slightly greater than that of the conveyor,

  - pressing means adapted to compress vertically-

  the layers before and during the glue hardening step, a drying tunnel traversed by the conveyor loaded with stacked layers with interposition of glue, - a four-sided planing device supplied with glulam, and - a mechanism cross sawing temporarily

secured to the glulam.

  The invention is described below in de1 ai. I by reference

  this in the appended drawings in which: r 5- FIG. 1 is a diagram showing the succession of

  stages of the continuous lamel manufacturing process

glue,

  - Figures 2, 3 and 4 show the successive parts

  ves of the installation, and - Figure 5 is a section taken along line V-V of

Figure 2.

  Referring to FIG. 1, the rectangles A, B, C, D and-E illustrate the following stages of method A: lamellating (gluing and stacking)

B: tightening -

  C: drying under clamping D: planing on four sides E: cutting on demand 'The means necessary for the implementation of step A

  (lamination) are illustrated in Figures 2 and 5.

  The means necessary for the implementation of stage B

  (tightening) are shown on the right side of Figure 3.

  The means necessary for the implementation of step C (drying) are illustrated on the left side of FIG. 3

  and on the right side of figure 4.

  The means necessary for the implementation of step D (four-side planing) are illustrated in the section

median of Figure 4.

  The means necessary for the implementation of step E (cutting on demand) are illustrated on the left of

Figure 4.

  If we examine FIG. 2, we see that a conveyor comprising a series of drive rollers 10 supports

  a "staircase" pile of layers of lamellae. More precise-

  ment, a first layer 1 formed of lamellae la, lb, lc and ld rests on the rollers 10 and supports a second and a third layer 2 and 3 of lamellae. Guides 11il provided on either side of the stack of strips prevent

their lateral displacement.

  The stacking of the product as shown in FIG. 2 was obtained as follows: originally, the strip 1a of layer 1 was in the position occupied by the strip Id in FIG. 2. Driven by the rollers 10 and channeled by the guides 11, the strip 1a is passed opposite a first gluing station 12 which has coated its upper surface with glue while the strip 1b was deposited on the rollers 10 at the following the lamella la and was in turn glued at 12. While the lec lamella was deposited on the rollers 10 following the lamella lb, the adjacent parts of the lamellae la and lb came into line with a first stacking station designated by the reference 1i 13 o the strip 2a of the layer 2 was deposited, by appropriate means, straddling the strips la and lb. The assembly formed by the strip 2a resting on both the strips la and lb then reached a second gluing station 14 o the upper face of the strip 2a was coated with glue, while a strip 2b came place in 13 straddling the lamellae lb and lc

previously glued.

  After continuation -of routing, - the situation is as shown in FIG. 2 o, at a second stacking station 15, the strip 3a has come

  place on the glued side of the strip 2a.

  The process continues until the desired number of layers is obtained (twelve in the example illustrated in

drawings, figures 3 and 4).

  As can be seen from FIG. 2, pressure rollers 16 are provided which rest on the last lamella deposited in the extension of each layer and which

  rotate at a faster speed than the drive rollers

  10. This has the effect of compressing the joint between

  this newly deposited lamella and the anterior lamella-

  ment deposited belonging to the same layer. Rollers 17 are also provided fitted with a cleaner to eliminate

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  There is excess glue downstream from at least some gluing stations. I.es guides 1I1 advantageously include means, such as grooves 18 for the flow of excess

{glue.

  If we come to Figure 3, we see that the stack-

  The layer of layers is subjected to groups of pressure rollers 19 subjected to the action of pneumatic or hydraulic cylinders 20. The stacking of layers of lamellae then enters a tunnel 21 the length of which is a function of the time necessary for the adhesive to harden and at the speed of

  moving the conveyor. The time required for hardening

  the glue itself is a function of the nature of the

  glue and the means used to harden it.

  As can be seen in FIG. 4, the raw glued laminated beam from the tunnel 21 then passes through a four-sided planing device 22 which puts it at the finishing dimensions. It then arrives opposite a radial type saw 23 which, outside of the cutting periods, is retracted (position shown in dotted lines) and which, for cutting, temporarily solidifies with the beam (position shown in solid lines) and moves with it to allow a cross section along line 24

  by means of its blade 25 slidingly mounted on the axis 26.

  It is thus possible to cut the lamel beam -

  laminated - resulting from the process according to the invention to all

desired lengths.

  Before sawing the beam, the beam from the four-sided planing step could also be divided longitudinally using a saw (27)

  having a battery of alternative blades.

  It appears from the above description that the process

  and the installation according to the invention allow the manufacture-

  industrial tion of beams and all parts in glued laminated on request, obviously reducing the cost of production. It is thus possible to obtain both glulam capable of serving as' load-bearing structures as

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  glue-laminates using derated wood that can be used as non-load-bearing structures, in custom formwork, shading, furniture, etc. It is understood that the present invention is not limited to the embodiment described and shown. In particular, the suitably modified process and installation could as well be used to manufacture

a curved beam.

Claims (11)

  1- Process for the continuous production of glued laminated timber consisting of a glued stack of layers, each of which is formed from strips of wood joined end to end, characterized in that it consists of: a- routing a first layer (1) towards a first gluing station (12) where an area (la) of this layer is coated with glue, b- simultaneously: 1. routing the glued area (la) of the first layer (1) to a first area d stacking (13) o a second layer (2) is deposited on the first, and 2. to continue the routing of the first layer (1) to the first gluing station (12) o a subsequent area (lb) of this layer is coated glue -   c- simultaneously 1. to route the assembly (la, 2a) from step bl. to a second gluing station (14) where the second layer (2) is coated with glue, 2. to route the glued area (lb) of the first layer (1) from step b2. towards the first stacking area (13) o a second layer (2) is deposited on the first, and 3. to continue the routing of the first layer (1) to the first gluing station (12) o a new subsequent zone (lc) of this layer is coated with glue simultaneously: 1. to route the assembly (la, 2a) from step - cl. towards a second stacking station (15) where a third layer (3) is deposited on the second 2 to 4: to be subjected to the steps described under cl. to c3. the product respectively from steps c2. and c3. as well as the rest of the first layer, e- to continue the alternating succession of gluing and stacking steps at as many stations as necessary to obtain a product having the desired number of layers, and to harden the glue by any means suitable for nature of this glue.   2- A method according to claim 1, characterized in that one proceeds simultaneously to the extension of each layer and to the increase in the number of layers. while the product is transported to the glue hardening area. 3- A method according to claim 1 or 2, characterized in that it consists in routing each new strip 1; (lb-lc, 2b) of a layer (1, 2) at a speed slightly higher than the speed of transport of the support (10, 1) on which said layer rests.   4- Method according to any one of claims 1   to 3, characterized in that it also consists: e'- in subjecting the stacking of the layers resulting from step e- to a vertical compression prior to the placing in   work of step f- and during this implementation.   - Method according to any one of claims 1   to 4, characterized in that, for step f-, the stacking of   layers is conveyed through a drying tunnel (21).   6- A method according to any one of claims 1   to 5, characterized in that it also consists of: g- putting the raw glue-laminate to the finishing dimensions   from step f- by planing of its four faces.   7- Method according to any one of claims 1   to 6, characterized in that it further consists:   f- to cut the glulam on demand.   8- Installation for implementing the method according to claim 1, characterized in that it comprises: - a conveyor (10) perpendicular to which are provided: a station for depositing a first layer (1) of slats on the conveyor (10) a gluing station (12) of said first layer (1) a stacking station (13t) of a second layer (2) on the glued area (la) of the first layer (1) S. a gluing station (14) of the second layer (2) stacked on the first layer, then an alternating succession of n stacking stations and nl gluing stations for the production of a laminate - bonded with n + 2 layers, and   - a hardening zone (21) of the adhesive. -   9- Installation according to claim 8, characterized in that it further comprises means (16) ensuring each new strip (lb, lc-2b) added in the extension of a layer (1, 2) a movement speed   slightly larger than that of the conveyor (10).   - Installation according to claim 8 or 9, characterized in that it further comprises pressing means (19, 20) adapted to compress the front layers   and during the glue hardening step.   11- Installation according to any of the claims   tions 8 to 10, characterized in that it comprises a drying tunnel (21) traversed by the conveyor (10) responsible for layers stacked and glued.   12- Installation according to any of the claims   tions 8 to 11, characterized in that it includes a four-sided planing device (22) supplied with glulam.   13- Installation according to any of the claims   tions 8 to 12, characterized in that it comprises a   sawing mechanism (23, 25, 26) temporarily secured wheat of glulam.   14- Glued-laminated resulting from the implementation of the process   according to any one of claims 1 to 7.