FR2629048A1 - METHOD OF PACKAGING PARALLELEPIPEDIC PRODUCTS AND DEVICE FOR REINFORCING THE PACKAGING MATERIAL - Google Patents

Abstract

This method is intended to allow the packaging of a parallelepipedal product, in particular a ream of paper, by means of a conventional packaging material which is taken from a supply reel and is cut according to the format. of the product, in a packaging machine, in sheets in which the product is then packed. According to this method, a reinforcing strip, with a width of 10 to 80 mm, is deposited fixedly on the continuous sheet of packaging material which is fed to the packaging device, along each of its two edges. and on its underside.

Description

(FRENCH REPUBLIC Publication No. 2 629 048 {use only

  for NATIONAL INSTITUTE reproduction orders)

INDUSTRIAL PROPERTY

  INDUSTRIAL PROPERTY N national registration 89 03154 PARIS () Int CI4: B 65B 61/00, 25/14, 41/12; B 31 F 5/08;

B 65 H 21/00, 23/06.

@ A1 PATENT APPLICATION

  Filing date: March 10, 1989. (Applicant (s): Company known as: ZANDERS Feinpapieoe

AG. - OF.

  (Priority: DE, 25 March 1988, n P 38 10 059.2.

(Inventor (s): Karl-Heinz Janssen.

  (Date of public availability of the

  application: BOPI "Patents" n 39 of September 29, 1989.

  (References to other national documents appearing

rented: (n) Holder (s):

  Agent (s): Cabinet Peuscet.

  (i Method for packaging parallelepiped products and device for reinforcing the packaging material, @ This method is intended to allow the packaging of a parallelepiped product, in particular a ream of paper, using a conventional material packaging which is taken from a supply reel and cut according to the format of the product, in a packaging machine, into sheets -.7 in which the product is then wrapped. a reinforcing strip, of a width of - - - - / 80 mm, is deposited in a fixed manner on the continuous sheet of packaging material which is brought to the packaging device,

  along each of its two edges and on its underside.

  I o c0 N O Sale of fscicus'IMPRIMERIE NATIONALE, 27. rue deCnenton75732 PARIS CEDEX 1 N M.D Sale of booklets at IMPRIMERIE NATIONALE. 27. rue de la Convention - 75732 PARIS CEDEX 15 Method for packaging rectangular products and device for reinforcing the packaging material

  The subject of the present invention is a method of packaging

  lage of a parallelepiped product and a device for strengthening the edges of a sheet-like packaging material

  continuous, especially of paper, which is brought to a packaging machine

  lage of parallelepiped products.

  When packing parallelepiped products

  flexible, preferably flat stacks of thin paper

  sor which are known under the name of oars, there is the problem of a lack of mechanical strength of the packaging on the front faces. The source of this phenomenon is believed to be the

  lower stiffness from one side to the other of the paper, transverse

  in the direction of movement of the sheet. The reams are usually folded in the packaging sheets in such a way that the flaps formed by the lateral inversion of the wrapping paper projecting beyond the ream are arranged on the smallest sides (front faces), this is that is to say in general transversely to the direction of movement of the wrapped paper of given format in the form of reams. These flaps are then folded over one another, in opposite directions of rotation, on the front faces of the train and are glued to them. This type of gluing of the flaps on the front faces

  oars is called bonding of head tapes.

  Experience has shown that the reinforcement obtained on the front faces by means of the flaps of the packaging glued to one another is not sufficient, during the usual handling of the oars,

  especially when stacked on pallets, to prevent tearing

  rure of the packaging on the edges of the slightly rigid front faces at bending. Additional reinforcement can be obtained by using thicker packaging sheets, the length of the existing shutters being chosen so that they can be

  folded around the upper edge of the front faces.

  In any event, this results in a substantial increase in height on the front faces of the train, so

  that, during stacking, they sink into the outer layers

  take out the wrapped paper and distort it so that

  if necessary, they must be discarded. In addition, the use

  thicker flexible wrapping paper did not provide

  sufficient improvement. No such improvement would be possible.

  ble only by using packaging sheets of a considerable grammage

  significantly higher, with the increased cost it takes

  consider for packaging material.

  According to patent DE-A-570,636, there is known a rotary machine for mass production of shirts or cover sheets provided with a broached edge and perforations. With this machine, reinforcing strips are brought to a sheet continuous paper unzipping from a supply reel and offering a width which is a multiple of the width of future shirts and are glued on it, the number of these bands corresponding to that of the pairs

  cherry must be side by side.The continuous sheet is a-

  then transformed into shirts by dividing in the long direction

  The paper moves at an invariable speed through the machine, from a reel to

  the release of shirts. The reinforcement strips are applied

  kills continuously at constant speed.

  The machine known from this patent DE-A-570,363 is not suitable for laying reinforcing strips on sheets

  packaging material, since on the machines

  nes of classic packaging, the introduction of the continuous sheet

  takes place in a clocked fashion and therefore appears

  encounter difficulties with the band meeting

  reinforcement and continuous sheet of packaging material.

  The object of the present invention is to provide a method of packaging a parallelepipedal sheet product, by means of which the edges of the packaging material are reinforced before the actual packaging operation, as well as to provide a

  suitable device for carrying out the reinforcement.

  It has now been found that, in the case of the use of

  tion of the tape bonding at the head, one can obtain sufficient mechanical resistance from the oar packaging along the edges of the

  front faces by reinforcing each of the edges of the wrapping paper

  lage per strip of light weight paper stuck on it. The problem underlying the invention is solved by a method of packaging a parallelepiped product, in particular a ream of paper, using a conventional packaging material which is taken from a reel of feed and is cut according to the form of the product, in a packaging machine, in sheets in which the paper ream is then wrapped, characterized in that a reinforcing strip is deposited with a width of 20 to

  mm fixedly on the continuous sheet of packaging material

  the line which is brought to the packaging device, along each of

  its two edges, on its underside.

  In this way, in the case of conventional paper formats, for example the standard format 70 x iOU cm, a

  effective protection against tearing of the edges of the front faces

  on the one hand using standard commercial kraft paper

  with a grammage of 80 g / m2 and a longitudinal and transverse elongation

  versal at break of 2 to 10% and, on the other hand, glued on it

  ci, marginal reinforcement strips in kraft paper of a grammage, including a coating of dextrin, of 80 g / m2. In this case, it has proved advantageous for the reinforced edge of the wrapping paper to fold over the edges of the front faces by

protruding by approximately 5 to 20 mm.

  When the process according to the invention is used on conventional packaging machines, the marginal reinforcement only takes place when the packaging product and the marginal strips are introduced into the packaging machine, in order to '' avoid keeping a considerable stock of reels of different widths of this packaging product and these marginal bands depending on the

different dimensions of the oars.

  This is why the solution according to the invention also relates to a device for implementing the method which is

  can be integrated into conventional packaging machines.

  This device for strengthening the edges of a sheet

  packaging material, moving in a ca-

  dencée. by means of two strips of reinforcing material, contains coils for supplying the reinforcing material and the packaging material, guide rollers intended to convey the strips of reinforcing material to activation devices

  of glue or glue deposit which are arranged between a roller-

  guide of a packaging device and the guide rollers provided for the strips of reinforcing material, and a pressurized support device intended to bring the strips of reinforcing material into pressure contact with the strip of reinforcing material packaging, and is characterized in that: a) two units of application of the reinforcing material are provided which act independently of one another and each of which is associated with an edge of the continuous sheet of packaging material , b) the functional elements of each of these units have a working width corresponding to the largest width of the reinforcing strips to be used and are fixed on common support elements adjustable transversely to the continuous sheet of packaging material, c ) these support elements are integral, according to a

  adjustable distance and by means of bars or rods

  guide tees, devices of the packaging machine which are used for cutting the edges of the continuous sheet and d) there are two devices for adjusting the tensile force acting independently of one another and

  for the two strips of reinforcing material.

  It is essential that it is at the same speed as that of the continuous sheet of packaging material that the reinforcing strips are each brought to this continuous sheet and glued to it, while a tensile force must be ensured from the reinforcement strip which is as uniform as possible and which is not increased even during a sudden start of the introduction of the continuous sheet, which would lead to the for.-a - tone of creases and a wavy edges of the sheet

  contrin the flexible packaging material.

  Another difficulty when using the reinforcement

  The edges on the packaging machine came from the fact that, apart from the variation in width and spacing of the marginal reinforcement which is necessary when changing the ream format,

  such variation is also necessary for identical types

  oar ticks, given that their height and compressibility

  may vary to a small extent. Tractive effort

  which varies on the edges of the continuous sheet of packaging material

  age due to a structural lack of homogeneity in this

  another sheet was yet another difficulty.

  - The reinforcement strips are deposited permanently, being parallel to one another at a spacing from each other such that, after the train has been wrapped in the finished packaging, the reinforcement strips are arranged on the front faces packaging and reinforce the packaging material on its

  front faces and its front edges.

  To strengthen wrapping paper with a gram-

  mage oe 70 to 150 g / m2, it is in particular gummed paper of one gram-

  mage, including an adhesive coating, from 50 to lOU g / m2 which is suitable for reinforcing strips. For conventional reams of paper, widths of the reinforcement strips from 2U to 80 mm are sufficient. The reinforcing material can also be a laminate of paper and plastic layers, for example

polyethylene.

  The surfaces to be reinforced of the packaging material are zones, located along the longitudinal edges of the continuous sheet of packaging material, which are the subject of the folds.

  lateral when wrapping the oar and which constitute the faces-

  fronts of the packed train. The reinforcing strips are deposited on the continuous sheet of packaging material in such a way that their outer edge coincides with or extends parallel to the edge of the sheet of contirJe material, narrow marginal strips of the continuous sheet of material

may remain unreinforced.

  Thanks to the fact that the width of the reinforcement strip

  is chosen wider by 5 to 2U mm than the height of the parallelepi-

  tears to be packed, the reinforced surface extends over the entire front face and its edges, as well as over a few millimeters

  on each of the side faces of the packaged train.

  The possibility of using a gram-

  very low mage leads to considerable material savings

and fees.

  Figure 1 shows schematically the envelope

  a ream of paper in the packaging material 21.

  In the marginal part of its edges, the leaf conti-

  bare packaging material 21 is reinforced with the strips of reinforcement material 1, these reinforcement strips 1 being located below on the first representations, so that

  their position is only indicated by the broken line.

  The packaging material is then cut into sheets with the dimensions (2a + 3c) x (b + 2c) according to the format of the train, a corresponding to the length, b to the width, transversely to the

  direction of travel, and c at the height of the ream of paper.

  The following representations schematically illustrate the envelope

  oar placement in the sheet for folding

known Oes faces and their collage.

  Figure 2 shows the ream of paper completely wrapped, with the folding of the faces on the front edges and the position of the reinforcing strips 1 on the front sides of the packaging, the width of the reinforcing strips being chosen so as to be slightly greater than the height of the train, so that, beyond the front faces, these reinforcing strips

  still extend on the lateral faces and that the fringes

  tales are thus reinforced. This is shown schematically at

Figure 2.

  The device, capable of carrying out the marginal reinforcement, in accordance with the invention, of a packaging material in the form of a continuous sheet when it is introduced into a conventional packaging machine, offers the principle structure

  shown in Figures 3 and 4 which is characterized in its entirety

  ble by the use of two independent units each associated with an edge of the continuous sheet of packaging material. Figure 3 shows schematically, from the side, the structure of the device according to the invention and its mounting on a packaging machine. The drive device 26 serves to

  the drive of the supply reel 25 of the packaging material

  lage 21. The continuous sheet of packaging material 21 is drawn from this supply reel 25 and, passing over guide rollers 22, 23 and 30 and- passing through the edge cutting device 27, it is brought to the advance and introduction device 28 allowing it to be introduced into the actual packaging device 24. The transverse cutting device

  29 is used to divide this continuous sheet into individual sheets.

  dual. The strips of reinforcement material 1 are laid on the continuous sheet 21 of the packaging material is carried out at the location of the guide roller 30 where these reinforcement strips i are joined to the continuous sheet 21 and where the joining by gluing is carried out by means of a pressurized support device 9 fixed on the support element 10. A resiliently mounted brush has for example proved to be suitable for pressing under pressure the continuous sheet of packaging material on the strips reinforcement material 1

  guided on the 3U direction change rollers.

  The support element 10 provided for the functional elements

  nels of the device for reinforcing the continuous sheet of material is mounted displaceable in translation on guide rails 13 by means of rolling rollers 12, transverse to the direction of movement of the continuous sheet of packaging material 21. The adjustable members edge cutting 27 provided for the packaging material in the form of a continuous sheet 21 and associated with the packaging machine are made integral with the support elements 10, their distance from these elements 10

  may vary by means of known structural elements.

  From a supply coil 2 which can rotate freely and easily and which can be immobilized by means of a mechanical brake with magnetic actuation 3, the material of

  strip-like reinforcement 1 is sent to a humi-

  dification or application of glue 8 by passing on a roller

  said compensator 4 (tension roller) and on a changers roller

  direction 7 and then, after activation of the glue located on the reinforcement strips or after deposition of glue, it comes into contact with the continuous sheet of packaging material 21. In the case of glues, being on the material strips

  reinforcement, which can be activated by water, can be used.

  read as a humidification device 8 a known embodiment comprising an automatic supply of water which moistens the adhesive during

  the passage of the reinforcement strips.

  A pressure roller 16 which is narrow and easily rotatable allows to obtain, for free operation

  disturbance of the edge reinforcement device, a cushioning

  advantageous weaving of jolts of tensile force, with a uniform effect, independent of the diameter of the supply coil 2. This roller 16 is mounted on a bracket 17 and, by means of bars

  guide 18, it moves easily in the vertical direction

  wedge above the highest point of the supply spool 2 and acts on it, during the entire course, with a uniform pressure which can vary thanks to the application of elements

dump.

  Reference 11 designates a threaded rod assembly and

  threaded plug which allows adjustment of the support elements 1U trans-

  versally to the direction of movement of the continuous sheet of material. The traction force is regulated on the strips of reinforcement material 1 by switching it on and off.

  mechanical brakes with magnetic actuation of feed coils

  mentation 2 of the reinforcing material 1, this activation and deactivation being triggered by means of the compensating rollers 4 which, when they leave or reach their fixed rest position, actuate the switch 6 which serves as a pulse emitter. In order to avoid excessive oscillations of these compensating rollers

  4, the switching stroke must be chosen as short as possible

  tion and response time of magnetic brakes.

  When the packaging machine pulls the packaging material 21, this traction also acts on the strip of reinforcing material 1, so that the compensating roller 4 moves away from its rest position. A pulse emitter driving this compensating roller responds immediately to such a change in position and, by means of an appropriate control device, the

  magnetic actuation brake 3 located on the supply coil

  tation 2 of the strip of reinforcing material is released

  and the reinforcing material is released as long as, by annu-

  lation of the stress force, the compensating roller 4 has not returned to its rest position. At this time, the brake 3 is again activated via the control device, so that the advance of the reinforcing material is blocked. The braking and damping elements are described above by way of example, but other means can also be used, such as

  only pneumatically operated elements.

  Figure 4 shows schematically, in elevation and in a sectional view showing its essential parts, the arrangement of the device according to the invention for one half of the continuous sheet of packaging material 21. We recognize the support element 1U, its mounting suspended on the rails of

  - guide 13 by means of rollers 12, as well as the provision

  adjustment sitive 11 formed by the threaded rod and sleeve assembly

  threaded and an adjustment motor 20.

  Are fixed on the support element 10: the compensating roller 4 with the switch b and the tensioning device 5 allowing the positioning of this compensating roller, the axis of the supply reel 2 of the strip reinforcements, the brake 3 acting on this axis and finally the

  edge cutting 27 movable-laterally in translation.

  Furthermore, by passing over the guide roller 7 and over the humidification device or glue application, the reinforcing material in the form of a strip 1 is sent between a guide roller of the packaging machine and the continuous sheet of the material

  21 which surrounds this guide roller and, by means of the arrangement

  pressure support device 9, it is brought into contact under pressure with this continuous sheet, sufficient for the bonding to be obtained. The problem of fixing the marginal reinforcement strips on the continuous sheet of packaging product according to the spacing determined by the dimensions of the ream is resolved, with a possibility of modifying this spacing in a precise and uncomplicated way during a change in the dimensions of the train or on the occasion of small fluctuations in the height of the train due to the nature of the material, by the fact that all the elements of the two units of the marginal reinforcement device are, for each, permanently mounted on a common rigid support element 10 which can be moved in translation on the guide rails 13 by means of the rollers 12, transverse to the continuous sheet of packaging material. Advantageously, this translational movement is effected by means of the threaded rod 11 which is driven by the adjustment motor 20 and which must be controlled according to the operating state of the packaging machine, state

  service from which we can determine, -----------------

  immediately, the effect of the position variation of the

  marginal reinforcement on the packaging operation.

  It turns out to be advantageous to make elements of

  support elements 10 the adjustable edge cutting members 27 provided for the packaging material in the form of a continuous sheet 21 and associated with the packaging machine, while their distance can also be varied relative to the elements of support 10

  by means of known structural elements.

  The joining of the edge cutting members 27

  with the units of the marginal reinforcement device is possible when

  that the fluctuation in width from 5 to 20 mm, mentioned above, is authorized

  top, with which the reinforced marginal area of the ---------------

  l! continuous sheet of packaging material is brought around the

  edges of the front faces of the train.

  This allows, with reinforcing strips with a width of preferably only 5 cm, to be able to carry out the packaging of the trains of all usual dimensions. In the case of thin oars less than 3 cm high, after adjustment

  (manual) of the edge cutting member 27 relative to the arrangement

  marginal reinforcement sitive towards the middle of the leaf

  bare of packaging product 21, the reinforced marginal zones are then also cut out, which is more economical and requires less work than keeping available and replacing one with the other

  reinforcement materials of different widths.

  A narrow pressure roller 16 which can be easily rotated allows to obtain, for the disturbance-free operation of the marginal reinforcement device, an advantageous damping of the tensile stresses, with

  a uniform effect independent of the diameter of the supply coil

  tion 2. This roller 16 is mounted on a stirrup and, by means of guide bars, it moves easily in the direction

  vertical above the highest point of the supply coil

  tion 2 and it acts on it, during the whole process,

  with a uniform pressure which can vary by application of ele

load elements.

  Easy replacement of the supply coil is obtained

  tation 2 that we have finished using, thanks to a tiered mounting of a

  only side of the core provided for this coil 2 and thanks to the possibility

  lity to remove the flange 14 thereof which is removed from the

  bearing, after having unscrewed the fixing nut 15.

  An essential feature of the reinforcement device

  ment marginal according to the invention is constituted by the independent operation of the two units associated with the edges of the continuous sheet of packaging material, for which the actuation of the magnetic brakes 3 is not carried out

  common, for example being triggered by the rotation of the roller-

  3U guide, but, as shown, under the action of an impulse caused by the tensile force of the considered reinforcement strip. It turns out, during the operation of the reinforcement device, that the switching operations corresponding to the two magnetic brakes take place at notable time intervals. I1 appears on this occasion different reports of tensile force for the reinforcing strips, reports

  which may be due to a not fully uniform action

  me of the respective tensile stress regulators, but also at different introouction forces on the guide rollers 3U due to a non-uniform tensile force on the edges of the continuous sheet of packaging material, a slip partial

  which may occur with respect to the guide roller 30.

  For the structural realization of the reinforcement device

  With marginal cement, structural elements and conceptions which are classic are used to a large extent.

  core provided for the feed coil 2

  necessarily in the form of a band, the force regulation 5 by means of a helical spring which is connected to the swivel arm, of about 20 cm

  long, the easiest compensating roller 4

  possible with a diameter of about 4 cm. The humidification device 8 is a powered embodiment

  automatic in water which is classic for bands

dextrin gummed glue.

  Using the device according to the invention,

  would be the packaging of a train with reinforced front edges

  using kraft papers with a grammage of 70 to 150. We cons-

  tate that are suitable for this occasion both normal kraft papers having a longitudinal elongation of 1.5 to 2.5% and a transverse elongation of 4 to 6% as also so-called CLUPAK papers (registered trademark) having longitudinal elongations of 5 to 1US. As reinforcement material, it is preferably possible to use conventional strips of kraft paper having a grammage of 30 to 8U g / m2 and a gumming which can be made active on the bonding plane by humidification. The preferred embodiment of the device according to FIGS. 3 and 4 also authorizes the use of paper

  plastic coated kraft on one side only. A PA-

  classic packing pier this oar treated using the device

  is for example a CLUPAK (registered trademark) paper of 85 g / m2 at al-

  longitudinal length from 5 to 7% and transverse elongation from 4 to 6%, comprising a polyethylene coating of 15 g / m2 on the inside and an advertising print on the outside, this paper being reinforced on the boras with 5 cm wide strips of heavyweight kraft paper, 6U g / m2,

  comprising a dextrin exfoliation of ZU g / m2 on the uncoated side

  polyethylene kills, the reinforcement area can be cut

  up to a width of 3 cm in the case of thin trains.

  The use of other materials, namely films

  cules, instead of paper, and similarly other glue systems, is also possible and is therefore found in the

part of the invention.

  Furthermore, thanks to the possibility of relative displacement of the longitudinal cutting members 27 relative to

  1U support element, the device according to the invention self-

  apply the reinforcement strips according to the varian-

  following: - the edges of the sheet of packaging material and, for each, one edge of the reinforcing strip are one above the other. The reinforced zone then has the initial width of the reinforcement strip, preferably 5 to 20 mm from

more than the height of the train.

  - The edges of the continuous sheet of packaging material

  the edge and, for each, an edge of the reinforcing material lie one above the other, the reinforcing zone being

  however made narrower by longitudinal cutting. (Applica-

  in the case of thin trains).

  - The distance from the edge of the reinforcement strip which is located towards the middle of the continuous sheet of packaging material

  with respect to the outer edge of this continuous sheet is higher

  less than the width of this strip. (Application in the case of

thick oars).

Claims (9)

  1. Method for packaging a parallelepiped product, in particular a ream of paper, using a conventional packaging material (21) which is taken from a supply reel and is cut according to the format of the product, in a packaging machine, in sheets in which the product is then packaged   product, characterized in that a reinforcing strip is deposited   ment (1) with a width of 20 to 80 mm fixedly on the continuous sheet (21) of packaging material which is brought to the packaging device, along each of its two edges and on its underside.   2. Method according to claim 1, characterized in that the distance separating the edge of the reinforcing strips (1) which is turned towards the middle of the continuous sheet (21)   of packaging material and the associated edge of this sheet   packaging material is greater than the height (C) of the parallelepiped to be packaged.   3. Method according to claim 1, characterized in that, as reinforcement material, use is made of gummed kraft paper having a grammage of 30 to 80 g / m2 and comprising a dextrin coating of approximately 20 g / m2 and, as packaging material, kraft paper with a grammage greater than 70 g / m2 and an elongation at break according to the   longitudinal direction from 2 to 10%.   4. Method according to claim 1, characterized in that the reinforcing strips (1) are placed on the continuous sheet (21) of packaging material so that their outer edge coincides with the edge of this continuous sheet of material or extends parallel to it and that ,. after this installation, the continuous sheet (21) of material to be cut is cut   the width required for packaging.   5. Method according to claim 1, characterized in that the width of the reinforcing strips (1) is greater than 20 mm to the height of the parallelepiped to be packaged, in that the reinforcing strips (1) are deposited parallel to the to each other at a distance from each other such that,   after the product has been -----------------------------   wrapped in the complete packaging, they are arranged on the   front sides of the packaging and reinforce the packaging material   lage on the front faces and front edges.   b. Method according to any of claims 1   to 5, characterized in that one independently controls the feeding of the two strips (1) of reinforcing material to the continuous sheet (21) of material, the actuation of each conm.r. donkey being triggered by differences in the tensile stresses of   I reinforcement bands that can be preselected.   7. Method according to claim 6, characterized in that the actuation of the command comprises braking or releasing the supply coils of the reinforcing material which can turn easily.   8. Device for reinforcing the edges of a continuous sheet (21) of packaging material, moving so   clocked, using two bands of reinforcing material   ment (1), comprising coils for supplying the reinforcing material (2) and the packaging material (25), guide rollers (7) intended to convey the strips of reinforcing material (1) to devices (8) for activating glue or depositing glue which are arranged between a guide roller (U30) of a packaging device and the guide rollers (7) provided for the strips of reinforcing material, and a support device under   pressure (9) intended to bring the strips of reinforcement material   ment (1) in pressure contact with the strip of packaging material (21), characterized in that: a) two units for applying the reinforcing material (1) are provided which act independently of one of the other and each of which is associated with an edge of the continuous sheet of packaging material (21), b) the functional elements (2-9, 17) of each of these units have a working width corresponding to the most   large width of the reinforcement strips to be used and are fixed.   on common support elements (lU) adjustable transversely to the continuous sheet of packaging material (21),   c) these support elements (10) are integral with   re, at an adjustable distance and by means of guide bars or threaded rods, of the devices (27) of the packaging machine which are used for cutting the edges of the continuous sheet and d) two control devices are provided acting independently of one another and intended for conveying the two strips (1) of reinforcing material to the sheet continuous material (21).   9. Device according to claim 8, characterized   in that the control devices include rollers   thinkers (4) for guiding the reinforcing material in   strip form, compensating rollers, each of which, the   oscillating placements depending on the tension of the sheet   1 bare are used as control pulses for a brake (3) acting on the associated supply coil (2) of the strip. reinforcement material (1).   10. Device according to claim 8, characterized in that the functional elements fixed on one of the support elements (10) comprise, for each: a supply coil   (2) of reinforcing material (1) disposed on a core, a device   positive braking (3) acting on the axis of this core, a compensating roller (4), means (5) allowing the elastic mounting of this compensating roller (4), a pulse emitter (5) actuated by the deviations from this compensating roller, a guide roller (7) allowing the change of direction of the strip of reinforcing material (1) in the direction of the glue activation or glue application device (8) placed behind it, a pressure support device (9) making it possible to exert a pressure contact on the strip of reinforcement material (1) joined to the continuous sheet of packaging material (21), a support bracket (17) comprising a guide rod and intended for a pressurized support roller (16) driving the supply coil (2), a   bearing mounting (18) for the guide rod (17).   1/2 aIiLI 6) NOC% à -a ___ In - '_ O0 (4.5 VVadflOi it o,' so zo!?, VT; x,, i, ;; - v: -, I / i. - :. ./ I ..... 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