FR2470000A1 - PROCESS FOR MANUFACTURING OBJECTS SUCH AS CONTAINERS FROM WOOD RESIN AND FIBRILES AND DEVICE FOR IMPLEMENTING THE SAME - Google Patents

Abstract

METHOD AND DEVICE FOR MANUFACTURING OBJECTS SUCH AS CONTAINERS, FROM A MIXTURE OF RESIN AND WOOD FIBRILLES OBTAINED BY THE DRY METHOD. A FIRST FLAT MOLD 8 IS FILLED WITH THE MIXTURE OF WHICH THE PLAN SHAPE CORRESPONDS TO THAT OF THE DEVELOPED OBJECT TO BE MANUFACTURED, A FLAT PRECOMPRESSION OF THE MIXTURE IS PERFORMED INSIDE THE FIRST MOLD TO OBTAIN A FLAT ROUGH, 62 THIS FLAT ROUGH IS TRANSFERRED TO THE UPPER PART OF A SECOND HOLLOW MOLD 56, A COMPRESSION OF THE FLAT ROUGH INSIDE THE SECOND MOLD TO OBTAIN THE FINISHED OBJECT 63 AND THE FINISHED OBJECT IS REMOVED FROM THE SECOND MOLD.

Description

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  The present invention relates to a method for producing

  objects such as containers from a mixture of resin and wood fibrils and more particularly from

  of such a mixture obtained by the dry route.

  It is already known to make pulp objects

wet cellulose.

  This process which always requires a subsequent cutting is heavy and expensive because it requires large investments and

  a significant expense of essentially thermal energy.

  A dry process is also known.

  It consists in shaping a pulp by depression

  cellulose impregnated with resin.

  This technique is difficult to master and a

unsatisfactory cost price.

  The present invention aims to overcome these disadvantages.

  For this purpose, the subject of the invention is a method of manufacturing objects such as containers from a mixture of resin and wood fibrils obtained by the dry route characterized by the fact that it is filled with using the mixture a first flat mold whose plan shape corresponds to that of the

  of the object to be manufactured, that a precom-

  flat pressure of the mixture inside a first mold to obtain a flat blank, which is transferred this flat blank to the upper part of a second hollow mold, which is carried out a compression of the blank flat inside the second mold to obtain the finished object and remove

the finished object of the second mold.

  This process which starts from the bulk mix to arrive at the finished product can be fully automated. As a result, high productivity can be achieved for an investment

  not important which allows reduced production costs.

  Energy consumption is also reduced.

  The mixture of resin and wood fibrils may for example be of the type described in French Patent No. 78.25.291. Molding is possible with percentages

  different from the various resins that can be used.

  Thus, for the production of food packaging, it is possible to use plant resins or synthetic resins of the melamine type or else various organic, protein or phosphoprotein binders. In

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  the case of non-food applications may be used thermo-curable binders such as urea-formaldehyde, an epoxy, a

  Polyester or an acrylic or vinyl binder.

  This process makes it possible in particular to perform

  truncated-pyramidal or truncated-conical piers with a depth ranging from a few millimeters to more than 150 millimeters. It is thus possible to manufacture containers with a conicity of the order of 8 to 100 and

  having at their upper part a ledge allowing the operator

lation.

  The thickness of the walls of such containers can

  to 3 / 10ths of a millimeter.

  The thus obtained container is molded in a single operation without a trimming or a subsequent finishing is necessary. By properly choosing the percentage and nature of the resin used it is possible to obtain porous or impermeable objects with water and grease and, with a

  starting material of the type described in the French patent.

  mentioned above, objects resistant to heat, for example for the realization of packs for frozen ready meals. Preferably the transfer of the plane blank of

  first flat mold with the second hollow mold is made by sliding

  is lying. This mode of transfer is particularly advantageous in the case where the plane blank obtained by precompression

  has sufficient strength to be manipulated.

  In one embodiment, the method includes a step of opening the first planar mold after

  precompression to allow the sliding of the plane blank.

  The method may also include a step of

  both to equalize the surface of the resin mixture and fibrils

  of wood arranged in the first flat mold.

  It is also possible to bake the mixture of resin and wood fibrils in the second mold

hollow during compression.

  Advantageously, in the method according to the invention a plurality of first flat molds are driven continuously one after the other from the filling station

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  to the precompression station and then to the trans-

  from the plane blank to the second hollow mold.

  Another subject of the present invention is a device

  This is useful for carrying out the process described above.

  According to the invention this device is characterized by the fact that it comprises at least a first flat mold, the means for filling this flat mold with a mixture of resin and wood fibrils obtained by the dry route, means for precompressing the mixture in the first flat mold, a second hollow mold, medium go to transfer the precompressed mixture of the first flat mold to the second hollow mold, means for compressing the mixture in the second hollow mold and means for driving the first flat mold filling means to the prescreening means and precompression means to the means of

transfer.

  The means of training may in particular comprise a longitudinally movable steel strip capable of cooperating

  with at least one magnet mounted on the first flat mold.

  The steel strip is advantageously driven in

  continuous and the magnet is a permanent magnet, fingers

  may cooperate with stops integral with the

  first flat mold being arranged on the device at the location

  This first mold must be stopped.

  Preferably the device comprises a braking sole integral with the first flat mold capable of cooperating with braking members disposed on the device upstream of the retractable fingers in the direction of advancement of the ribbon

mobile steel.

  In order to obtain a good adhesion between the first flat mold and the steel strip, it is preferably provided that the magnet is mounted on the first flat mold by means of a lever pivoting about an axis substantially parallel to the

  movable steel ribbon and perpendicular to its advancing direction

  cement. In this case, the elastic means can be provided

  to recall the pivoting lever on the opposite side to the steel ribbon.

  The first flat mold may also comprise at least one rolling member mounted idle relative to the mold, at least one running track secured to the device then being

  provided to cooperate with this rolling member.

  In a preferred embodiment of the invention, the first flat mold comprises a base plate and at least one mold plate having a cutout having a shape corresponding to that of the development of the object to be manufactured, the mold plate forming with the baseplate when placed thereon a container capable of receiving the mixture of resin and wood fibrils, and the mold plate being capable of being disengaged from the baseplate for

  allow the sliding of the plane blank obtained by precom-

pressure.

  In this case, the mold plate can be rotatably mounted on the base plate about an axis substantially

parallel to the base plate.

  Advantageously, the mold plate then has beyond its axis of rotation a lever extension capable of being pressed towards the base plate to cause the mold plate to rise relative to the

base plate.

  In a preferred embodiment of the invention the first flat mold comprises two mold plates whose joined cuts define the enclosure, the two plates being arranged to be spaced substantially symmetrically by

compared to the base plate.

  The device according to the invention may also comprise

  means for disengaging the mold plate from the base plate. These means may for example comprise at least one jack for driving in the direction of the base plate the extension

of the mold plate.

  The device may also comprise means for

  keep the mold plate clear of the base plate until

  than by means of transfer of the mixture precompressed in the second

hollow mold.

  These holding means may for example comprise an integral member of the rod of a jack, this member being capable of coming across the path of the mold plate

  after his release to prevent his return.

  They can also include at least one guide

  substantially parallel to the displacement of the first mold,

  tible to engage between the base plate and the mold plate

clear of the base plate.

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  Moreover, the means of transfer may include

  dre a stop capable of stopping the plane blank above the second hollow mold while the first flat mold continues its movement. This abutment preferably has a shape capable of causing a centering of the flat shape to the upper part of the

second hollow mold.

  Advantageously, the first flat mold comprises a

  abutment surface capable of ejecting a finished object

  extracted from the second hollow mold.

  Advantageously also, the device comprises downstream compression means, means for returning the plate

of mold on the base plate.

  Other features and advantages of the invention

  will appear in the following description of one of its forms of

  realization given by way of non-limiting example.

To the attached schematic drawings -

  Figure 1 is a representative diagram for

  above an installation according to the invention.

  FIG. 2 is a side view showing a unit

  molding of the installation of Figure 1.

  Figure 3 is a top view of a flat mold according to the invention.

  FIG. 4 is a side view of the mold of FIG.

  FIG. 5 is a front view of the mold of FIG.

re 3.

  Figure 6 is a side view on a larger scale

  of the precompression station of Figure 2.

  FIG. 7 is a plan view along line VII-VII of FIG. 6 of the punch used at the precompression station of FIG.

Figure 6.

  Figure 8 is a larger cross-sectional view

  scale of the opening station of the flat molds of Figure 2.

  FIG. 9 is a side view of the opening station

  flat molds shown in Figure 8.

  FIG. 10 is a view from above on a larger scale of the compression station of FIG. 2 in one of its

stages of operation.

  Figure 11 is a view similar to Figure 10 showing the compression station in another step of its operation.

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  Figure 12 is a cross sectional view of

  compression of Figure 2 in one of its stages of operation-

  is lying. FIGS. 13 to 15 are figures similar to FIG. 12 showing in a transverse view the compressor station

  in other stages of operation.

  The installation shown in FIG. 1 comprises eight molding units (1) as will be described more in

  detail with reference to Figure 2. Of course, a different number

  A number of molding units could be provided.

  Figure 1 also schematically shows a steel strip (2) whose function will be described below. This steel strip has two parallel strands along which are disposed the molding units (1). These parallel strands are returned to two pulleys (3), one of which is driven to a

  suitable speed using a motor not shown.

  Figure 2 shows a molding unit in more detail. Each molding unit generally comprises a filling station (4), a precompression station (5), a

  opening station for flat molds (6) and a compressor station

  sion (7). Flat molds (8) described in more detail below circulate from one station to another of the unit (1) as well as from one

unit to another.

  If we now refer to Figures 3 to 5 we see

represented a flat mold (8).

  Each mold (8) essentially comprises a plate of

  base (9) and two mold plates (10). Each plate of mold

  (10) has a cutout (11), the cutouts (11) once attached having the cross-shaped appearance shown in Figure 3. This form is the developed object to be manufactured which in this case is a food packaging type "tray" as shown in the left part of Figure 2, ie substantially a truncated pyramid provided at the upper part of

  its opening of a rim allowing the seals.

  When the two mold plates (10) are placed on the bottom plate (9) as shown in FIG. 3, it can be seen that the edges of the cutouts (11) delimit with the plate of

  bottom (9) an enclosure that forms the flat mold itself.

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  Each mold plate (10) is rotatably mounted on the bottom plate (9) by means of pins (12) passing through bearings (13)

  integral with the plate (9) and the holes formed in the

  (11). Furthermore, the plates (10) have beyond the axes (12) extensions (14) and the base plate (9) is cut as shown in (15) below the extensions (13). ) further comprises a friction sole (16) at its upper part and a stop (17) at its

  lower part whose functions will be described below.

  In addition, an articulated lever (18) is mounted around an axis (19) perpendicular to the base plate (9) and carries on its outer side four permanent magnets (20). Finally the end of the lever (18) opposite the axis (19) is biased by a spring (21) connecting this end to a fixed point (22) of the base plate (9). This spring (21) has not been shown in FIG.

to clarify more.

  The base plate (9) also supports at its lower part four balls (23) mounted in cages (24) for

  allow the rolling of the flat mold (8).

  The base plate (9) and the mold plates (10) are preferably made in a material supporting flexions

  repeated, for example glass / polyester laminate.

  Referring now for example to Figure 8 and Figure 2 in which the steel strip (2) has not been shown for clarity, however, it will be seen that all along the two rolling paths (25) are provided on which the beads (23) of the molds (8) can bear. When the molds (8) are thus arranged, the permanent magnets (20) are then in contact

  with the steel ribbon (2) which is therefore likely to

  dragging the molds (8) along the various stations of a molding unit and along the various molding units of the installation. Furthermore, at the locations where the molds (8) must be arrated, that is to say, as will be seen below, the precompression stations and the opening stations of the flat molds, there are provided retractable stops ( 26) who, cooperating

  with the abutments (17) of the molds (8), can stop the progress

  these molds. Unrepresented braking members

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  are also provided upstream of the retractable stops (26) to slow the molds (8) before stopping, to avoid shocks that could affect the homogeneity of the distribution of the mixture in the molds. These braking members may for example be

  simple rubber friction pads. When a

  (8) is thus stopped, the permanent magnets (20) slide on

  the steel strip (2) without it being necessary to stop

  this. This mode of displacement of the molds (8) is particularly advantageous because it eliminates the disadvantages of the means of displacement step by step. The setting of the installation is found

thus greatly facilitated.

  Moreover, when the molds (8) pass in the zone of the pulleys (3), the lever (18) inclines with respect to the base plates (9) as indicated in phantom in FIG. 3, which makes it possible to ensure a proper hanging of the

  molds (8) with steel ribbon (2) even in these areas.

  The molds (8) are therefore driven as just described along the various positions of a unit of

  molding in the direction of the arrows (27) in Figure 2. These differences

  The various posts will now be described in more detail.

  The filling station (4) for the molds (8) is

  felt on the right side of figure (2). This station essentially comprises a storage hopper (28) for receiving the bulk mixture of resin and wood fibrils. This storage hopper is equipped at its lower part with a

  pallet distributor (29) of known type.

  Moreover, a recovery hopper (30) comprises at its lower part an exhaust orifice through which its contents are poured and mixed with the product dispensed by the

distributor (29).

  The recovery hopper (30) has at its upper part a fine mesh fabric (31) and a deflector

  pneumatic (32). A conduit (33) opens in the axis of the deflec-

  tor (32) and is powered by a turbine (34). The turbine (34) sucks through a duct (35) and a hood (36) the excess delivered product raised by a rotating brush (37) which is itself driven by a motor block / dimmer (38). The pre-compression station, which is shown in greater detail in FIG. 6, comprises a jack (39) to the rod of which is connected a punch (40) shown in plan in FIG. 7 and whose shape corresponds to that of the enclosed enclosure. by the walls of the cutouts (11) of the mold plates (10). Below the cylinder (39) and the punch (40) a reaction plate (41) is disposed between the races (25). The height of the reaction plate (41) with respect to the rolling paths (25) is such that when a mold (8) is arranged below the punch (40) with its balls (23) on the

  tracks (25), the space (42) between the inferior surface

  of the base plate (9) and the upper surface of the reaction plate (41) is minimal. It is important that when the punch (40) is depressed the bending of the mold (8)

  not lead to its destruction. It is to this end that the

  (8) are preferably made of a material such as

  glass / polyester laminate that can withstand repeated bending

without being damaged.

  Furthermore, a stop (26) is provided at the precompression station (5) to stop the flat molds (8) so that the enclosure defined by the mold plates (9) is below the punch (40). A friction pad as mentioned above is also provided for slowing the molds (8) before the stops (26) and (17) are in contact to reduce

shock.

  The opening station of the flat molds (8) is

  detailed in Figures 8 and 9.

  This station comprises on the one hand, two cylinders (43) whose rods (44) are provided for pressing on the extensions (14) of the mold plates (10). Furthermore, a third cylinder (45) has at the lower part of its rod (46) a member (47) able to get across the path of the mold plates (10) when they are open as will be described below. Finally, two guides (48) are also provided so that,

  during the advancement of the flat molds (8), their end is

  plating between the mold plates (10) of the flat molds (8).

  Advantageously, a fourth cylinder (70) is arranged as shown in Figure 8, between the two cylinders (41). At the free end of the rod (71) of this jack (70) is provided a

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  plate (72), likely to press flat on the blank

  before the rods (44) lift the mold plates (10).

  The plate (72) can be raised as soon as the mold plates (10) have been raised to let the flat blank go with the mold (8). A retractable abutment (26) is provided at a location such that it can, by cooperating with the abutment (17) of a mold (8), stop this mold in a position such that the rods (44) of the cylinders (43) ) are vertical to the extensions (14) of the mold plates (10). Upstream of the stops (26) is arranged

  a friction pad to cooperate with the rubbing soles.

  (16) molds (8) to avoid a sudden stop.

  Figures 10 to 12 show in detail the compression station (7). This compression item essentially comprises

  a jack (49) carrying at its lower part a punch (50).

  Another jack (51) comprises a thrust plate (52) on which the rod of the jack (51) rests on one side and

  the other side of the ejectors (53). The punch (50) carries, vis-à-

  screw ejectors (53), pushers (54) retractable solicited

  cited to their output position of the punch (50) by means

elastics not shown.

  The compression station further comprises, disposed on a support (55) a hollow heating mold (56) engageable with the punch (50), whose inner shape (57) corresponds to that of the product to be obtained. The mold (56) is provided

  drilling (58) allowing the passage of the ejectors (53).

  The retractable pushers (54) protrude from the punch (50) in an amount sufficient to allow the pinch blank between these pushers and the ejectors (53) to reach the bottom of the cavity (57) of the mold (56) before the edge (50 ') of the punch

  (50) does not reach the edge (56 ') of the mold (56).

  Indeed, in the opposite case, it would result at the moment of the descent of the punch (50) a cutting of the blank and a pinch of this blank on the peripheral rim (57 ') of the cavity (57) before the blank does not touch the bottom of this cavity. In addition, the depth of the mold is greater than the development of the peripheral rim of the cavity, so that it is possible to obtain a molding that does not require subsequent trimming.

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  The compression station further comprises a stop (59), transversely substantially U-shaped as seen in Figures 12 to 150 This stop is disposed above the mold (56) at a height just sufficient to allow passage between the mold (56) and the lower surface of the stop (59), flat molds (8). This abutment (59) further comprises at its upstream portion a centering cutout (60) whose

function will be described below.

  Finally downstream of the compression station (7)

  substantially horizontal closure (61) arranged at a

  height above the running tracks (25) and inclined

  in relation to these raceways, are provided for

  ensure the closure of flat mussels.

  We will now describe the operation of this installation, first of all, for greater clarity, assuming that it has only one flat mold, then considering the case where several flat molds are arranged one after the other.

others.

  The hopper (28) being loaded with resin mixture and wood fibrils, the pallet dispenser (29) allows the

  passing a predetermined flow of this mixture.

  The mixture falls on a flat mold (8) and therefore fills the enclosure delimited by the bottom plate (9) and the

  walls of the blanks (11) of the mold plates (10).

  When the flat mold (8) passes under the hood (36) the excess mixture is lifted by the rotating brush (37) and

  is sucked by the turbine (34) to be recycled through

  mediate the conduit (33) in the recovery hopper (30). These recycled products are distributed using the deflector (32) and fall with the mixture from the hopper (28). The

  mold (8) is thus conveyed continuously to the

  compression (5) or it is stopped by the corresponding retractable stop (26). The jack (39) is then actuated so that the punch (40) compresses the mixture contained in the mold enclosure (8) to obtain a planar blank having sufficient strength. The jack (39) is then released which causes the rise of the punch (40) after which the stop (26) is retracted

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  so that the mold (8) is again driven by the ribbon

of steel (2).

  When the stop (17) of the mold (8) comes into contact

  with the retractable stop (26) of the opening station

  the (6), the mold (8) is again stopped. After the plate (72) has been lowered by means of the jack (70), the cylinders (43) are actuated so that their rods (44) by pressing the extensions (14) of the mold plates (10) cause the pivoting of these mold plates (10) and the opening of the mold. The plate (72) is then raised. The jack (45j is then actuated so that the member (47) is placed as shown in Figure 8 thus preventing the fall

  mold plates (10) so that the rods (44) of the

rins (43) can be reassembled.

  The stop (26) of the opening station of the molds (6) is then retracted, so that the mold continues its path to the compression station (7). Before the posterior end

  mold plates (10) do not protrude beyond the member (47),

  Anterior mite engages on both sides of the guides (48) so that these plates (10) can not fall. The organ (47)

can then be raised.

* When the open mold (8) arrives at the compression station (7), the stop (59) comes into contact with the flat blank released by the mold plates (10) as shown in FIG. its sliding relative to the

  bottom plate (9) while the mold (8) continues its movement.

  tively. The plane blank is thus centered in the blank (60) of

  the abutment (59) and falls to the upper part of the mold (56) (fi

  Figure 11). The mold 8 continuing its movement arrives at the bars (61) which cause its closure by coming into contact

with the mold plates (10).

  After the departure of the mold (8) the device is in the configuration shown in Figure (13) with the flat blank to the upper part of the mold (56). The cylinder (49) is then actuated as shown in Figure 14 so that the precompressed plane blank is folded in the cavity (57) of the mold (56).

  The jack (51) is calibrated to provide resistance to the ejection of the ejectors (53) which makes it possible to pinch the precompressed flat blank between the ejectors and the pusher, and thus of it -13-

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keep its centering.

  With the ram (49) pushed back to the bottom, the final object is molded between the punch (50) and the mold (56) as shown in FIG. 15, the pushers (54) being retracted inside the punch (50). ). The raising of the cylinder (49) is controlled by a delay circuit to determine the cooking time which

  can be of the order of 4 to 8 seconds.

  After the cylinder (49) is reassembled, the cylinder (51) is actuated which ensures the extraction via the intermediaries

  ejectors (53) of the finished object (61) as shown in FIG.

gure 2.

  In practice the installation works continuously as

shown in Figure 2.

  Several molds (8) abut against each other following the mold (8) which is retained by the stop (26) of the precompression station (5). Another mold (8) is retained by the stop (26) of the opening station of the molds (6). At the same time, a precompressed blank (62) has been deposited and centered at the top of the mold (56) by the stop (59) while the mold (8) corresponding to continuing its advancement and a finished object (63) has been filed, as described below, on the

stop (59).

  The cylinders (39) of the precompression station (5), (43) and (45) of the opening station of the molds (6) and (49) of the station

  compression (7) are then actuated to simultaneously precom-

  primer the mixture contained in the mold (8) stopped at the precompression station, open the mold (8) stopped at the opening station of the molds, and ensure the compression of the flat blank (62)

  precompressed deposited on the mold (56).

  After the time required for cooking in the mold

  (56), the cylinders (39), (45) and (49) are raised and both

  stops (26) of the precompression station (5) and the opening station

  molds (6) are retracted and immediately

  the first to stop the first mold (8) already filled, and the second to stop the mold (8) that comes

  to be released by the stop (26) of the precompression station (5).

  Simultaneously, the jack (51) is actuated to extract from the mold (56) the finished object made from the blank (62),

  The mold (8) released by the stop (26) of the workstation

  mussels (6) resumes its advancement so that its

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  front portion forming abutment comes into contact with the finished object which has just been extracted from the mold (56). Therefore, this mold (8), while depositing its precompressed preform at the top of the mold (56) pushes the finished object inside the abutment (59). This finished object pushes itself the finished object (63) previously deposited in the stop (59), so that it falls

  between the raceways (25) on an evacuation collector

  suitable cuation, for example a conveyor belt not shown perpendicular to the raceway (25). Such an exhaust manifold can be provided for each molding unit (1), each depositing the finished objects it covets on a general collector gathering the molded objects to all the units of

  molding (1) of the installation shown in FIG.

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Claims (22)

  1. A method of manufacturing objects such as recipes   piezes, from a mixture of resin and wood fibrils obtained by the dry route, characterized in that the mixture is filled with a first flat mold whose plan shape corresponds to that of the developed of the object to be manufactured, which is carried out a flat precompression of the mixture inside   of the first mold to obtain a plane blank, which is   fers this plane blank to the upper part of a second hollow mold 10, that is carried out a compression of the flat blank inside the second mold to obtain the finished object, and that   the finished object is removed from the second mold.   Process according to Claim 1, characterized in that the transfer of the flat blank from the first flat mold to the   second hollow mold is made by sliding.   3. Method according to claim 2, characterized in that it comprises a step of opening the first flat mold after the precompression to allow the sliding of the plane blank.   Process according to any one of claims 1   at 3, characterized in that it comprises a step of equalizing the surface of the mixture of resin and wood fibrils disposed in the first flat mold   Process according to any one of claims 1   a 4, characterized in that a firing of the resin mixture and wood fibrils is carried out in the second mold hollow during compression.   6. Method according to any one of claims 1   at 5, characterized in that a plurality of first flat molds are continuously driven one after the other from the filling station to the precompression station and then to the transfer station of the plane blank at second hollow mold.   7. Device for implementing the method according to   any one of claims 1 to 6, characterized by   it comprises at least a first flat mold, means for filling the first flat mold with a mixture of resin and   fibrils obtained by the dry route, means for pre-   compressing the mixture in the first flat mold, a second hollow mold, means for transferring the precompressed mixture from the first flat mold to the second hollow mold, means for compressing the mixture in the second hollow mold and means for driving the first mold flat, filling means with precompression means, and precompression means transfer means.   8. Device according to claim 7, characterized in that the drive means comprise a longitudinally movable steel strip capable of cooperating with the   less a magnet mounted on the first flat mold.   9. Dispoitif according to claim 8, characterized in that the steel strip is driven continuously and that   the magnet is a permanent magnet, retractable fingers   able to cooperate with abutments integral with the first flat mold being arranged on the device at the locations where the first mold must be stopped.   10. Device according to claim 9, characterized in that it comprises a brake shoe integral with the first flat mold, adapted to cooperate with   provided on the device upstream of the fingers   Motivable in the direction of advancement of the moving steel ribbon.   11. Device according to any one of the claims   8 to 10, characterized in that the magnet is mounted on the first flat mold by means of a lever pivoting about an axis substantially parallel to the moving steel strip and   perpendicular to its direction of advancement.   12. Device according to claim 11, characterized in that elastic means are provided for recalling   the pivoting lever on the opposite side to the steel ribbon.   13. Device according to any one of the claims   8 to 12, characterized in that the first flat mold comprises at least one running member mounted idle relative to the mold, and that at least one raceway is provided for   cooperate with this rolling body.   14. Device according to any one of the claims   7 to 13, characterized in that the first flat mold comprises a base plate and at least one mold plate having a cutout having a shape corresponding to that of the developed object to be manufactured, the mold plate -17- 247000 (   forming with the base plate, when placed on it   ci, an enclosure capable of receiving the mixture of resin and wood fibrils, and the mold plate being able to be disengaged from the base plate to allow the sliding of the plane blank obtained by precompression. 15. Device according to claim 14, characterized in that the mold plate is rotatably mounted on the base plate about an axis substantially parallel to the plate basic.   16. Device according to claim 15, characterized in that the mold plate has, beyond its axis of rotation, a lever extension capable of being pressed towards the base plate to cause a lifting of the plate of mold compared to the plate of based.   17. Device according to any one of the claims   14 to 16, characterized in that it comprises two   plates of molds whose joined cuts define the   encircled, the two plates being arranged to be spaced apart   substantially symmetrically with respect to the base plate.   18. Device according to any one of the claims   14 to 17, characterized in that it comprises means   to clear the mold plate from the base plate.   19. Device according to all of claims 16 to   Characterized in that the means for disengaging the mold plate from the base plate comprise at least one jack for driving in the direction of the base plate the extension of the mold plate.   20. Device according to any one of the claims   14 to 19, characterized in that it comprises means for maintaining the mold plate disengaged from the base plate to the transfer means of the mixture precompressed in the second hollow mold.   21. Device according to the set of claims 14 to   20, characterized in that the holding means comprise an integral member of the rod of a cylinder, this member being capable of coming across the path of the mold plate   after his release to prevent his return.   22. Device according to all of claims 16 to -18- 2470000   characterized in that the holding means comprise   at least one guide substantially parallel to the movement of the first mold, engageable between the base plate   and the mold plate disengaged from the base plate.   23. Device according to claim 14, characterized in that the transfer means comprise a stop capable of stopping the plane blank above the second mold   hollow while the first flat mold continues its displacement.   24. Device according to claim 21, characterized in that the stop has a shape capable of causing a centering of the flat blank to the upper part of the second. hollow mold.   25. Device according to any one of the claims   7 to 24, characterized in that the first flat mold has an abutment surface capable of ejecting a finished object   previously extracted from the second hollow mold.   26. Device according to claim 14, characterized in that it comprises, downstream of the compression means,   means for returning the mold plate to the base plate.