FR2715101A1 - Process for manufacturing liquid product packaging and device for implementing the process - Google Patents

Abstract

The invention relates to a method and device for the manufacture of packaging for liquid products. A tubular sheath (8) is divided into two half-sheaths, parts of which opposite in pairs on either side of the longitudinal section (9) are provided with handles (16) and cut lines (30, 31) joining the longitudinal section (9) and the transverse weld beads (12). The cut line (30) and the cross section (32) are perforation cuts, and the gussets (21, 21 ') are torn off by rollers (36, 37) from the two half-sleeve pieces (2) during that these are still connected to the tubular sheath and / or are held by the cutting device (5) performing the transverse cuts (32, 33). The invention is applicable in the field of packaging.

Description

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  The invention relates to a method for manufacturing liquid product packaging in which a longitudinal, median longitudinal section is produced in a flat and resting tubular sheath, preferably provided with lateral folds, in order to obtain two tubular half-shells and in which parts of half-sheath opposite each other in pairs, on either side of the longitudinal section, are provided in zones of opposite angle to each other, separated by seams of welding extending at an angle, handles and cutting lines separating external corner pieces, the cutting lines opening into the longitudinal section and the neighboring transverse welding beads constituting the lateral cords of the half-sheath pieces, and in which the corner pieces, after having made transverse cuts separating in pairs the half-sheath pieces, half-sheath pieces are torn off, as well as a

  device for carrying out this method.

  Packages of the type manufactured in accordance with the process

  above are intended to contain liquids, for example

  as refill packs for liquid detergents.

  A known method and known device for making such packages for liquid products will be explained in more detail below with the aid of Figure 1 of the drawing. In a packaging manufacturing device 2 shown diagrammatically by the contour cutting device 3, the traction rollers 4, the transverse cutting device 5, the table top 6 serving as a support for the welded packages 2 and the conveyor belts 7, between a tubular strip 8 provided with lateral folds which is separated by a median longitudinal section 9 into two tubular half-shells 10, 11. Each of the two tubular half-shells is provided in the vicinity of its lateral folds between weld seams. transverse lines 12 indicated by a dashed line of welded beads 13 curved arcuate each of which seizes only one of the folds resting on each other side folds. In addition, the half-sheath pieces 2 delimited by the cords

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  transverse welding seams 12, in the vicinity of the median cutting line 9, are provided with weld beads 14 extending diagonally that meet the median cutting line 9 and the weld seams 12. By weld seams 14 extending obliquely, half-sheath pieces 2 have been separated on either side of the median cutting line 9 from the triangular zones 15 which, with respect to the median cutting line

  9, are located at the opposite corner areas of the half-parts

  sheath 2 opposed in pairs. The unrepresented form cutting device of a known type of construction realizes

  in the form 1 cutting station on the half

  sheath 2 opposed in pairs, during timed stops of the tubular sheath 8, in the triangular areas 15 of the cutouts of handles 16 and perforation sections 17 extending approximately parallel to the welding beads 15. At about the same time with the shape cut-outs in the cutting station of form 1, transverse cuts 5 are made in the transverse cutting station 5 through the tubular sheath 8 and the tubular half-shells 11 respectively for separating the packings 2 from the tubular sheath. The cross-sections 18 are passed in the middle through the transverse weld seams 12 of a relatively large width so that there remain on both sides transverse sections 18 of the packaging of the transverse weld seams closing on the side, divided in the middle. Simultaneously with the cross-sections 18, the outer corners of the half-sheath pieces are separated, the cut corner pieces remaining connected to the following half-sheath pieces by narrow tabs. After executing the next rate during which the tubular sheath has been intermittently transported along the width of a half-sheath piece, the conveyor belts 7 made of the usual suction belts transport the welded packages on a predetermined transport path so as to to form a slot between the welded packages 2 and the front end of

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  the next tubular sheath. The triangular gussets 21 and the triangular corner pieces 19 are then separated or torn off by the punching punches or striking members applying at once to these and are sucked. The suction belt 7 then removes the packages 2 in pairs from the device 1. Each package 2 made in the device 1 therefore has a filling opening 24 which is located next to the tongue 25 in which the gripping hole 16 is formed. filling the package, the opening 24 is closed in the usual manner. When filling, the packaging, in its bottom zone, takes a roughly round shape in that the median fold 23 represented by a dashed line is pushed into the plane of the bottom formed by the cords of

curved weld 13.

  During the manufacture of the packages on the known device described above, problems arise during the tearing and removal of the gussets 21 and the triangular parts 19 because it is necessary to remove or remove them by cutting punches . In addition, it is necessary to suck the torn ends to avoid incidents in the device caused by the accumulation of these. Finally, it is also necessary to intermittently drive the suction belt 7 to bring in a separate step the separated pair of packages in a position towards the front end of the tubular sheath 10 so that the gussets and corner pieces

  19, 21 can be torn off or crushed in rhythm.

  Furthermore, the known device, due to the realization of cutting punches tearing the gussets and corner pieces 19, 21 and due to the suction belt 7 driven intermittently is relatively expensive. The invention therefore relates to the creation of a method of the type indicated at the beginning which allows the safe separation of the gussets and corner pieces 19, 21 and their perfect evacuation

with a smaller expense.

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  According to the invention, this object is achieved in a method of the type indicated in that a section line separating a corner piece and the cross section between the half-sheath pieces of the tubular sheath are made in the vicinity of the another corner piece in the form of perforation cuts, and the gusset-shaped corner pieces are pulled off by pull rollers of the two half-sheath pieces while they are still connected to the sheath tubular and / or are held by the cutting punch executing the cross sections. In the process according to the invention, the approximately triangular gussets lying on either side of the longitudinal longitudinal section of the sheath are grasped and safely torn off by the traction rollers during the stops in rhythm, by intermittency, sheath. The traction rollers, after tearing, also support the evacuation of the gussets in a transport direction defined precisely so that they can be evacuated in a bin collecting the ends. A simultaneous and simple tearing of two gussets is achieved according to the invention, in that a gusset is connected to the handle of a package or a piece of half-sheath by the tongues of the perforation cut and that the other projecting pointed gusset is connected by the tongues of the perforation cut to the bead

  lateral welding of the other piece of half-sheath.

  According to a further development of the method according to the invention in which the two lateral folds resting on each other are provided in the vicinity of each piece of half-sheath arc-shaped curved bottom weld beads, of so as to obtain when filling by the opening of the side fold between the two curved bottom weld beads a substantially round bottom packaging, it is expected that the corner pieces of the side fold of each half-sheath piece are provided perforation cuts separating them and that the corner pieces thus formed are torn off approximately simultaneously with the corner pieces by pulling rollers. To do this, cutting

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  angle to the pieces of half-sheath passing in front can be carried out continuously so that the corner piece remains connected by at least one perforation tongue with the following half-sheath pieces because it is torn from the latter parts angle. These corner pieces can be torn in the same advantageous manner as the gussets by the rollers

  traction and can be evacuated in a bin.

  A device for carrying out the process according to the invention according to claim 1 with traction rollers advancing the tubular sheath or the two tubular half-shells intermittently, with cutting punches respectively performing at each rate in two pairs of opposite half-sheath pieces to each other of the loops, and angular cuts as well as cross sections with perforation sections in the vicinity of an angular piece, and with

  conveyor belts carrying the half-timber

  sheath separated in pairs on a support table, is characterized according to the invention in that are arranged in the vicinity of the table the two traction rollers applying by tightening them to the gusset parts and tearing and evacuating them, with axes arranged

  transversely to the direction of transport of the tubular sheath.

  Advantageously, the table is provided with a window-shaped opening for receiving the torn gusset pieces in which the pull rollers carry the gussets. You can then place a bin under this opening. According to other features of the invention, it is intended to have two traction rollers in the vicinity of the table to tear the corner pieces. The axes of these traction rollers are suitably parallel to the

  transport direction of the tubular sheath.

  Conveniently, the table has openings behind the pull rollers for receiving the

corner pieces torn off.

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  According to another embodiment of the invention, provision is made for the transport in pairs of flat packs conveyor belts driven continuously. These conveyor belts can be made in the form of simple conveyor belts since they are simply intended to transport the packings resting on them and that they are not provided, as is the case in the known device, to retain these by aspiration. According to an additional development of the invention, for which independent protection is required, it is provided that each pick-up roller is arranged by a freewheeling mechanism on a shaft which is mounted so as to freely rotate in a pivoting lever pivotally mounted, that the shaft is connected to a lever at the free end of which is articulated the piston rod of a pneumatic jack with cylinder and piston exerting a pressure on it and on the pivoting lever, and that the shaft is provided with a spring element tending to hold it against a stop of the pivoting lever and which is subjected to an overpressure by the pneumatic cylinder cylinder and piston only when the tear roller is supported on its support or on the sheet of sheath to tear off. In this additional development of the invention, it is intended for compression and for driving the tear-off roller.

  a single pneumatic cylinder cylinder and piston.

  Advantageously, there is connected to the shaft a second lever arm which is held by a tension spring tensioned between it and the frame against a stop of the pivoting lever. In this realization, the element to

  spring is constituted by a simple tension spring.

  The invention will be better understood, and other purposes, features, details and advantages thereof

  will become clearer during the description

  explanatory which will follow made with reference to the accompanying schematic drawings given solely by way of example

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  illustrating an embodiment of the invention and in which: FIG. 1 illustrates a known method and a device for manufacturing liquid product packaging; - Figure 2 is a schematic top view of the package manufacturing device; - Figure 3 is a side view of the roller

  as well as the training device of this

  this; and - Figure 4 is an angular sectional view, folded down

  in a plane, the tearing roller according to Figure 3.

  In FIG. 2, the parts identical to FIG.

  bear the same numerical references.

  In the shape cutting device 3, the cut 30 is simply made in the lower part of the tubular half-sheath 2 in the form of a perforation cutting line, whereas the cutting line 31 consists of a cut-off section.

full through.

  The transversely extending cutting line 32 is carried out in the transverse cutting station 5 to the zone 33. In the zone 33 which extends over the zone on one side of the right angle of the gusset 21, the cutting line extending

  transversely is achieved by a perforation cut.

  After further transporting the finished packages 2 by the continuously driven conveyor belts 33, the upper gusset 21 is further connected by the perforation cutting line 33 to the next piece of tubular half-sheath 2, while the lower gusset 21 ' is connected to the lower piece of tubular half-sheath 2 by the line of

perforation cut 30.

  As soon as the tubular sheath 8 or the two half-sheaths 11 have reached their position visible in FIG. 2, the tearing rollers 36, 37 which are arranged in a manner shifted in a staggered manner to one another in the direction of transport, pull the gussets 21, 21 'during a stop of the sheath of the pieces of half-sheath 2 and evacuate them to

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  through the opening 38 formed in the table top 6

  in a trash can under this opening.

  Correspondingly, the tearing rollers 39 tear off the corner pieces 19 of the half-sheath pieces 2 and discharge them through the openings 41, 42 in the housing.

  table top 6 in bins located below.

  During the next phase, after performing the cross-sectional cut, the half-sheath pieces 2 are evacuated by the rotating conveyor belts 33.

continually.

  During tearing of the gussets 21, 21 'and the angular pieces 19, the half-sheath pieces 2 are either still connected to the tubular half-shells 10, 11 so as to be held by the pairs of traction rollers 4, or they are held by retaining pieces applying from the side against the knife of the transverse cutting device and which push the sheath on a support. The tear rollers cooperate with the table top which serves as a stop. However, to reduce the friction with the table top, we can predict how

  thrusts also freely rotating rollers.

  We will now describe in more detail with the help of FIGS. 3 and 4 the construction of the pulling rollers at

the support of the tearing roller 36.

  The tear roller 36 is housed on the shaft 51 via a freewheel mechanism 50. The shaft 51, due to the ball bearings 52, is mounted so as to be freely rotatable in the lever pivoting 53 which is housed itself by the ball bearings 54 pivotally on a stud 55 secured to the frame. On the pin protruding from the pivoting lever 53 of the shaft 51 is fixed a hub 57 which carries two levers 58 and 59 arranged at an angle to each other. The lever arm 58 projecting towards the extension of the pivoting lever 53 is provided with a pin 59 arranged at a right angle thereto on which is rotatably mounted the piston rod 60 of a cylinder 61 of a pneumatic jack with cylinder and piston. The

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  cylinder 61 is pivotally mounted on a post 63

  connected to a retaining arm 62 secured to the frame.

  The second lever arm 59 fixed to the hub 57 is provided with a stud 65 oriented at right angles on which is fixed one end of a tension spring 66 whose other end is fixed to a post 67 of an arm integral with the frame. The traction spring 66 holds the arm 59 in application against a stop 68 connected to the lever

swivel 53.

  When the lever arm 58 is pushed down by the piston and cylinder pneumatic unit 61, the pivoting lever 53 pivots counterclockwise until the pulling roller 36 reaches the position 36 'represented by a phantom line in which it comes into contact with the sheath gusset 21. In this case, the tension spring 66 is prestressed so as to maintain the lever 59 in application against the stop 68 , so that the tearing roller 36 does not rotate relative to the pivoting lever 53. When the tearing roller 36, in the position 36 ', bears on the gusset duct 21, the cylinder and piston cylinder 61 exerts an overpressure on the tension spring so that the cylinder cylinder and piston rotates the tear roller 36 which causes the lifting of the gusset

  sheath 21 and the evacuation thereof.

  The tearing roller 36 is provided at its periphery with a groove in which is placed a ring 60 which has a

high coefficient of friction.

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Claims (10)

CLASS I CAT IONS   1. A method of manufacturing liquid product packaging in which is performed on a flat resting tubular sheath, preferably provided with lateral folds, a median separation cut to form two half-tubular sheaths and is carried out in half pieces -gain opposed to each other in pairs, on both sides of the longitudinal section (9), in angular zones (15) separated by seams (14) extending at an angle, opposite one another at the other, shackle holes (16) and cutting lines (30, 31) separating outer corner pieces (21, 21 '), the cutting lines (30, 31) opening into the longitudinal section (9) and the surrounding transverse weld seams constituting the lateral cords of the half-sheath pieces (2), and wherein the corner pieces (21, 21 '), after having made the cross-sections separating the half-pieces -gaine (2) in pairs, are torn off pieces of half-sheath (2) , characterized in that a cutting line (30) separating a corner piece (21 ') and the cross section (32) separating the half-sheath pieces (2) from the tubular sheath (8) are made at near the other gusset (21) in the form of perforation cuts (30, 33), and the gusset-shaped corner pieces (21, 21 ') are pulled off by pulling rollers (36). 37) of the two half-sheath pieces (2) while they are still connected to the tubular sheath (8, 10, 11) and / or are held by the device   cutting device (5) making the cross sections (32, 33).   2. The method of claim 1, wherein the two portions of lateral folds resting on each other are provided in the vicinity of each piece of half-sheath (2) curved bottom weld beads (13) shaped arc, so that during filling, as a result of the opening of the lateral fold between the two curved bottom weld beads (13) is obtained a substantially round bottom of the package, it 2715101 characterized in that the corner areas of the side folds of each half-sleeve piece (2) are provided with these dividing perforation cups, and that the resulting corner pieces (19) are torn apart at about the same time as the pieces of gusset angle (21, 21 ') by the rollers pulling (39, 40).   3. Apparatus for carrying out the method according to claim 1, comprising pulling rollers (4) which pull the tubular sheath or the two tubular half-sleeves (10, 11) intermittently at intervals with cutting devices. (3, 5) producing at each cadence, in two pairs of half-sheath pieces (2) opposite one another respectively the gripping loops and the angular cuts and the transverse cuts with perforation cuts at adjacent a corner piece, and conveyor belts (33) discharging the half-sheath pieces separated in pairs by means of a support table (6), characterized in that they are arranged in the vicinity of the the two traction rollers (36, 37) are applied by clamping them against the gussets (21, 21 ') and tearing and removing them, with axes located transversely to the direction of transport of the sheath tubular (8).   4. Device according to claim 3, characterized in that the table (6) is provided with an opening (38) shaped   window to receive the gussets torn off (21, 21 ').   5. Device according to claim 3 or 4, characterized in that two traction rollers (39, 40) are arranged in the vicinity of the table (2) to pull the corner pieces (19).   6. Device according to claim 5, characterized in that the axes of the traction rollers (39, 40) are parallel to the conveying direction of the tubular sheath (8).   7. Device according to one of claims 3 to 6,   characterized in that the table presents behind the rollers 12 2715101   traction (39, 40) of the openings (41, 42) for receiving   torn corner pieces (19).   8. Device according to one of claims 3 to 7,   characterized in that continuously conveyed conveyor belts (33) are provided for the evacuation of packages (2) lying flat.   9. Device according to one of claims 3 to 8,   characterized in that each pulling roller (36, 37, 40, 41) is housed by a freewheel mechanism (50) on a shaft (51) which is rotatably housed in a pivoting lever (53). ) pivotally mounted on a part integral with the frame, in that the shaft (51) is connected to a lever (58) at the free end of which is articulated the piston rod (60) of a pneumatic cylinder to cylinder and piston exerting a downward pressure thereon in conjunction with the pivoting lever (53), and in that the shaft (51) is provided with a spring element (66) which strives to maintain it against a stop (68) of the pivoting lever (53), and which is subjected to an overpressure of the pneumatic cylinder cylinder and piston (61) only when the pulling roller (36) is supported on its   support or on the piece of sheath (21) to tear.   10. Device according to claim 9, characterized in that it is connected to the shaft (51) a second lever arm   (59) which is held by a spring (66) stretched between it   ci and a retaining piece secured to the frame against a   stop (68) of the pivoting lever (53).