FR2867749A1 - DEVICE FOR FASTENING ON A REINFORCING PASTILLE FILM - Google Patents

Abstract

Device (2) for fixing on a film (3) reinforcing pellets (4) for producing a handle (5) of cut bag (6), comprising means for driving the film substantially flat in a running direction (D), characterized in that it comprises at least two positions (7) for fixing pellets (4) of reinforcement on the same face of the film (3), whose position is shifted transversely relative to the direction of travel of the film (3), and whose fixing cycles are synchronized so that at least a portion of the pellets (4) fixed by a first station (7) form with at least a portion of the pellets fixed by a second station (7) pairs of pellets (4) located at the same position in the direction of travel (D), two pellets (4) forming a couple can be superimposed by folding along a line (L) substantially parallel to the scrolling direction (D).

Description

The present invention relates to a method and a device for fixing on

  a film of a reinforcing pad for producing a cut bag handle.

  A reinforced plastic bag handle is made in known manner by fixing, on two walls of film intended to be fixed on one another two reinforcing pads, then fixing the two walls thus forming a stack of four distinct layers. wherein the handle is formed as a cut-out in the stack.

  The devices for producing these handles generally fix on a film intended to form the bag wall pellets at intervals determined in the direction of the scroll of the film.

  This arrangement makes it possible to fix the pellets with a single gluing station or pellet welding. However, the pellets being arranged in the direction of travel, the meeting of the pellets to allow forming the assembly in which the handle is cut can not be achieved simply during the scrolling of the film, it must be a separate operation .

  According to another device, the film is folded and two pellets fixing stations are used, respectively located above and below the film on which the pellets are to be glued. However, in this case also, the meeting of the pellets can not be obtained simply in the continuity of the scrolling of the film.

  The present invention aims to provide a device for fixing reinforcing pads for handles for performing the meeting of the pellets and the cutting of the handles in the direction of travel, and a flat film.

  To this end, the present invention relates to a fixing device on a film of reinforcing pellets for producing a cut bag handle, comprising means for driving the film substantially flat in a running direction, characterized in that it comprises at least two reinforcing pad fixing stations on one and the same face of the film, the position of which is offset transversely with respect to the direction of travel of the film, and whose fixing cycles are synchronized in such a way that at least a part of the pellets fixed by a first station form, with at least a portion of the pellets fixed by a second station, pairs of pellets lying at the same position in the running direction, two pellets forming a pair which can being superimposed by folding along a line substantially parallel to the direction of travel.

  Advantageously, at least two fastening stations are located at the same position in the direction of travel.

  According to one embodiment, the reinforcing pellets are cut from a reel of reinforcing film by cutting means.

  According to one possibility, the scrolling of the film is stopped during at least one step of a reinforcement pad fixing cycle.

  According to another possibility, the scrolling of the film is continuous during a reinforcement pad fixing cycle.

  Advantageously, the reinforcing pellets are welded to the film at a fastening station by welding means.

  According to one embodiment, the reel of reinforcing film is unwound thanks to at least one traction roller which deposits the reinforcing film 15 on an intermediate plate and then in contact with the film.

  Advantageously, the unwinding of the reinforcing coil is discontinuous and depends on the scrolling of the film.

  According to one embodiment, the cutting of the reinforcing pellets from the reinforcing film is performed on the portion between the welding means and the traction rollers.

  Advantageously, the film is initially wound into a coil.

  According to one embodiment, the reinforcing film is held in tension by at least one tension roller located between the reel and the at least one traction roller.

  The subject of the present invention is also a process for fixing a film of reinforcing pellets for the production of a cut bag handle, consisting in: driving the film substantially flat in a running direction, setting pellets of reinforcement in at least two locations, on the same face of the film, the position of which is shifted transversely to the direction of travel of the film, the fixing cycles at each of the locations being synchronized so that at least a part pellets fixed in a first location form with at least a portion of the pellets fixed at a second location pairs of pellets at the same position in the direction of travel, two pellets forming a couple can be superimposed by folding along a substantially parallel to the scroll direction.

  Advantageously, at least two attachment locations are located at the same position in the direction of travel.

  According to one embodiment, the reinforcing pellets are cut from a reel of reinforcing film.

  According to one possibility, the scrolling of the film is stopped during at least one step of a reinforcement pad fixing cycle.

  According to another possibility, the scrolling of the film is continuous during a fixing cycle of reinforcing pellets.

  Advantageously, the reinforcing pellets are welded to the film at a location of attachment.

  The present invention will be better understood on reading the following description with reference to the accompanying drawing showing an embodiment of a fastener according to the invention.

  Figure 1 is a perspective view of a fixing device for reinforcing pads.

  Figure 2 is a sectional view of a folded film for joining the reinforcing pellets.

  According to an embodiment shown in FIG. 1, a device 2 for fixing on a film 3 of reinforcing pellets 4 for producing cut bag handles 6 according to the invention comprises two posts 7 for fixing pellets 4 for reinforcement located parallel to and at the same position perpendicular to the direction of travel of the film 3. In Figure 1, the direction and the direction of travel are symbolized by the arrow D. The two positions 7 for fixing the pads 4 reinforcement are located on the same side relative to the film, that is to say above it.

  The film 3 is unwound from a coil 8 located upstream of the fastening stations 7 in the direction D of scroll. This film comprises a printed face 9 which is situated on the underside of the film, and an unprinted face 10, intended to form the inside of a bag 6.

  The reinforcing pellets 4 are intended to be fixed on the non-printed face 10 situated on the top of the film 3.

  To form a handle 5, it is necessary that two pellets are positioned so that they can be joined to one another when the bag is folded along a line (L) parallel to the conveying direction D. FIG. a simple example in which the film is simply folded to gather the pellets 4 one on the other. The assembly thus formed can then be fixed and cut to form the handle. However, in the case of Figure 2, the folding is performed along a line perpendicular to the conveying direction, according to known methods.

  The two stations 7 are synchronized in order to fix simultaneously, at a determined interval, each a pellet at the same position in the direction of travel D. It will subsequently be easy to fold the film 3, perpendicularly to the direction D of scrolling in order to join the two pellets 4 and form handles 5, in the continuity of the scroll.

  This arrangement is particularly advantageous because it allows to form handles in the continuity of the scroll of the film.

  Each fixing station 7 makes it possible to cut reinforcing pellets 4 from a reel 12 of reinforcing film 13 and to weld them onto the film 3.

  Each cutting station comprises, in the direction of travel represented by the arrow E of the reinforcing film 13: - a coil 12 of reinforcing film 13, - a set of rollers 14, 15, 16 of tension making it possible to maintain the film of reinforcement 13 stretched, the reinforcing film 13 being successively wound around the rollers 14, 15, 16, and the second roller 15 being movable in translation in a direction perpendicular to the direction of travel E and subjected to an elastic restoring force allowing it to maintain the reinforcing film in tension.

  - two traction rollers 17, 18 for unwinding the reel 12 of reinforcing film 13, - an intermediate plate 19 on which the reinforcing film 13 is unwound by the traction rollers 17, 18 and which lies between the film 3 and the reinforcing film 13, - cutting means 20 constituted by a blade mounted on a carriage, the film being cut perpendicularly to the running direction D at the intermediate plate 19, - welding means constituted by a jaw welding member 22 movable in translation along a vertical axis A situated below the film 3, and a fixed counterpart portion 23 located above the film 13.

  A cycle of setting a pellet in parallel proceeds as follows.

  In a first step, the film advances in the direction of travel D by a determined distance, under the action of not shown drive means. The reinforcing film does not move forward.

  In a second step, the film advances, and the reinforcing film is also unrolled, by the traction rollers 17, 18, so that a portion of the reinforcing film 13 is disposed beyond the intermediate plate 19, in contact with the film 3 facing the welding means 22, 23.

  In a third step, the advance of the film and the reinforcing film is interrupted, the traction rollers do not rotate, and the welding jaw 22 is moved upwards in order to block the portion of the reinforcing film in contact with the film 3 between the welding jaw 22 and the fixed counterpart 23. The jaw 22 is at a temperature sufficient to allow the welding of the reinforcing film portion 13 and the film 3 to be welded.

  During the same step, the cutting means 20 cut the reinforcing film at the edge of the intermediate plate 19, the cutting being facilitated by the holding in position of the reinforcing film by the jaw 22 and the counterpart 23 d. on the one hand, and by the traction rollers 17, 18 on the other hand.

  At the end of this step, a reinforcing pad formed from the reinforcing film portion is welded to the film 3.

  In a fifth step, the welding jaw is moved downward, releasing the film 3 and the pellet 4 thus formed, to return to the initial state of the first step.

  According to variants of this embodiment, a device according to the invention of fixing achieves the fixing by bonding of the reinforcing pellets and the fixing is carried out with a continuous scrolling of the printed film.

  As is self-evident, the invention is not limited to the preferred embodiments described above, by way of non-limiting example; on the contrary, it embraces all the variants within the scope of the following claims. Thus, in particular, the deposition of the pellets could be carried out on a surface, not horizontal as shown in the drawing, but having another orientation, such as vertical, or that these positions could occupy a different orientation from that shown in the drawing, without departing from the scope of the invention. On the other hand, the cutting means can be constituted for each station for fixing a cutting tool and a drive belt of the cutting tool. The two pellet fixing stations may also include a common drive belt for the cutting tools.

Claims (17)

  1. Device (2) for fixing a film (3) of pellets (4) of reinforcement for producing a handle (5) bag (6) cut, comprising means for driving the film substantially flat in a running direction (D), characterized in that it comprises at least two positions (7) for fixing pellets (4) of reinforcement on the same face of the film (3), whose position is shifted transversely relative to to the direction of travel of the film (3), and whose fixing cycles are synchronized so that at least a portion of the pellets (4) fixed by a first station (7) forms with at least a portion of the pellets fixed by a second station (7) pairs of pellets (4) located at the same position in the direction of travel (D), two pellets (4) forming a couple that can be superposed by folding along a line (L) substantially parallel to the scroll direction (D).   2. Device (2) according to claim 1, characterized in that at least two fastening stations (7) are located at the same position in the direction of travel (D).   3. Device (2) according to one of claims 1 or 2, characterized in that the pellets (4) of reinforcement are cut from a coil (12) of reinforcing film (13) by means of cutting (20).   4. Device (2) according to one of claims 1 to 3, characterized in that the running of the film (3) is stopped during at least one step of a fixing cycle pellets (4) of reinforcement.   5. Device (2) according to one of claims 1 to 3, characterized in that the scroll of the film (3) is continuous during a fixing cycle pellets (4) of reinforcement.   6. Device (2) according to one of claims 1 to 5, characterized in that the pellets (4) of reinforcement are welded to the film at a station 30 fixing (7) by welding means ( 22, 23).   7. Device (2) according to one of claims 1 to 6, characterized in that the coil (12) of reinforcing film (13) is unwound thanks to at least one traction roller (17, 18) which deposits the reinforcement film (13) on an intermediate plate (19) and then in contact with the film (3).   8. Device (2) according to one of claims 1 to 7, characterized in that the unwinding of the reinforcing coil (13) is discontinuous and depends on the scrolling of the film (3).   9. Device (2) according to one of claims 1 to 8, characterized in that the cutting of the pellets (4) of reinforcement from the reinforcing film (13) is performed on the portion between the welding means ( 22, 23) and the traction rollers (17, 18).   10. Device (2) according to one of claims 1 to 9, characterized in that the film (3) is initially wound into a coil (8).   11. Device (2) according to one of claims 3 to 10, characterized in that the reinforcing film (13) is held in tension by at least one tension roller (14, 15, 16) located between the coil and the at least one traction roller (17, 18).   12. A method of fixing to a film (3) of pellets (4) of reinforcement 15 for producing a handle (5) bag (6) cut, consisting of: - driving the film (3) substantially flat in a direction of travel (D), - fixing pads (4) of reinforcement in at least two locations, on the same face of the film (3), the position of which is offset transversely with respect to the direction of travel of the film ( 3), the fixing cycles at each of the locations being synchronized so that at least a portion of the pellets (4) fixed at a first location form with at least a portion of the pellets fixed at a second location pairs of pellets (4) being at the same position in the direction of travel (D), two pellets (4) forming a couple can be superimposed by folding along a line substantially parallel to the direction of travel.   13. Method according to claim 12, characterized in that at least two fastening locations (7) are located at the same position in the direction of travel (D).   14. Method according to one of claims 12 or 13, characterized in that the pellets (4) of reinforcement are cut from a coil (12) of reinforcing film (13).   15. Method according to one of claims 12 to 14, characterized in that the scrolling of the film (3) is stopped during at least one step of a fixing cycle pellets (4) of reinforcement.   16. Method according to one of claims 12 to 14, characterized in that the scrolling of the film (3) is continuous during a fixing cycle pellets (4) of reinforcement.   17. Method according to one of claims 12 to 16, characterized in that the pellets (4) of reinforcement are welded to the film at a location of attachment (7).