FR2565201A1 - METHOD AND INSTALLATION FOR PACKAGING A PACKET USING A PACKAGE SHEET AND PACKAGED PACKAGES OBTAINED - Google Patents

Abstract

A.PROCEDE FOR PACKAGING A PACKAGE USING A PACKAGING SHEET. B. PROCEDURE CHARACTERIZED IN THAT THE PACKAGE IS SURROUNDED WITH A SHEET COVERING AT LEAST PARTLY ITS LOWER SIDE 23, ONE OF THE SIDE SIDES 23 AND ITS UPPER SIDE 23 LEAVING THE REAR EDGE OF THE SHEET TO EXTEND BEYOND THE REAR SIDE AND THAT WE PUSH UNDER THE TRANSFER PATH THROUGH A SLOT. C. THE INVENTION RELATES TO PACKAGING TECHNIQUES.

Description

"Method and apparatus for packaging a package using a

packing sheet

and the packaged packages obtained ".

  The invention relates to a method and an installation

  for packing a package with a sheet

  packaging and the packages obtained.

  The invention is particularly applicable to the packaging of packets consisting of a group of objects such as bottles, cans or subgroups of objects already packaged by a sheet of heat-shrinkable plastic material. At present, when it is desired to pack a group of objects 1 (see FIG. 1) using a sheet of heat-shrinkable plastic material 2, this sheet is placed around the contiguous objects 1 so that the two ends of the sheet are arranged on the top of the group of objects where they are assembled in 3 by gluing or heat-sealing, the sheet then being subjected to heat-shrinking operations

  the purpose of which is to tighten the foil

  retractable on the group of objects that are thus joined together

each other.

  This known assembly method has various disadvantages

  and, in particular, it leads to the production of unsightly packages due to the two assembled edges of the sheet which form a ridge on the top of the package and, also, it leads to a consumption of plastic film which is relatively large, because of assembled film lengths that make up this peak. The most important disadvantage, however, lies in the fact that it results in packets whose assembly is not very strong due to the fact that the two contiguous edges of the sheet at 3 form a ridge which is oriented perpendicularly.

  on the upper face of the package, that is to say perpendicularly

  the zones 21 adjacent to the two assembled edges 3.

  However, when one carries out the thermo-retraction of the film or

  possibly when handling the package after thermo-

  retraction, the forces generated are exerted in the zones 21, that is to say perpendicular to the assembled surfaces of the ends 3, so that these forces tend to gradually separate the assembled surfaces since they are exerted on the line lower junction

these surfaces.

  The present invention is intended in particular to remedy these drawbacks and in particular to enable the production of a package (see FIG. 2), the grouped objects 1 of which are surrounded by a sheet 4 such as a sheet of shrinkable thermo-plastic material. , the ends 4 and 42 of this sheet being located under the lower face of the group of objects and being superimposed and assembled to one another by gluing or heat-sealing, so as to form a junction surface parallel to the lower surface

grouped objects.

  Thus, this assembly area, located under the group of objects, is concealed, while this method of assembly reduces the length of plastic film required and causes a solid junction because the tensile forces are exerted parallel to the surfaces of the extremities

41 and 42 assemblies.

  To this end, the invention relates to a method for packaging a package by means of a packaging sheet, characterized in that a package to be packaged is placed on a transfer path. around this package a wrapping sheet so that it covers, at least partially its lower face, one of its lateral faces, said front face, and its upper face, the rear edge of the sheet extending beyond the rear side face of the package, pushing the trailing edge of the sheet under the transfer path through a first slot which it is provided and relatively moves the slot of the transfer path and the package without sliding the package on the transfer path to place the trailing edge of the sheet under the front edge of this sheet,

itself located under the package.

  According to another characteristic of the invention, the packaging sheet is issued from a roll of film intended for the packaging of packets brought successively to the transfer path, characterized in that a cycle of operation is established. wherein the sheet is disposed substantially vertically to the transfer path to form a sheet curtain that passes through a second slot of the transfer path, the free end of the sheet being located under the transfer path, the first packets to be packaged on the transfer path and towards the curtain until this first pack is located beyond this second slot, the sheet then covering, at least partially the lower face, the front face and the upper face, the sheet is pressed by folding it between the first pack and a second pack until the folded part of the sheet penetrates into the second slot and cross section is cut the folded sheet portion under the transfer path so that the new end of the roll sheet forms a new sheet curtain for the second package, the first package surrounded by the severed sheet portion being fed to the first slot of the

  transfer path for its packaging.

  According to another characteristic of the invention, the first and second slots of the transfer path are merged and the sheet is pressed, by folding, between a first and a second packets until the folded part of the sheet enters the the single slot and relatively move the single slot of the transfer path and the package to place the two edges of the sectioned fold of the sheet under the first package and then brings back the slot

in initial position.

  The invention also relates to a machine for carrying out the method, this machine being characterized in that it comprises an endless belt stretched over rollers and forming, by its upper strand, a horizontal transfer path for the package to be packaged, a carriage under the upper run of the belt, which carriage is movable back and forth parallel to the transfer path and having rollers over which the upper run of the belt passes to form a first transverse slot on the transfer path, means located above the upper strand of the carpet, these means being movable towards the upper strand of the carpet to penetrate into the

  the first slot and drive the sheet into this slot.

  According to another characteristic of the invention, the carriage comprises at least three parallel rollers free in rotation, two of them being located at the height of the transfer path and defining between them the first slot, the third roller being located under both first, the upper strand of the carpet passing over these rollers to form a loop under the transfer path, this

  loop opening through the slot on this transfer path.

  According to another characteristic of the invention, the means for driving the sheet by folding it in the

  second slot is constituted by an alternating movable bar

  between a higher and lower position than

  respectively above and below the transfer path through the second slot, the bar being in its lower position applying the

  fold of the leaf on a way of cutting the leaf.

  The invention is shown by way of non-limiting example in the accompanying drawings, in which: - Figure 1 schematically represents a package packaged according to the known method; - Figure 2 shows a package packaged according to the method of FIG. 3 is a side view of an embodiment of the machine according to the invention for discontinuous operation, FIG. 4 is a top view of FIG. 3, FIGS. 5g illustrate the operating cycle carried out using the machine of FIGS. 3 and 4,

  FIG. 6 is a side view of a mode of realization

  modification of the machine, for continuous operation,

  FIGS. 6a to 6e illustrate the operating cycle

  the machine of Figure 6.

  The machine shown in FIGS.

  consists of two machine frames 5 and 6 mounted on

  letters and juxtaposed. Frame 5 has two endless belts

  7 and 8 arranged one behind the other, in the sense of

  Packing packages (arrow F) while the frame 6 comprises an endless belt 9 disposed after the belt 8 so that the carpets 7, 8 and 9 form by their upper strand

  a transfer path 10 for the objects to be packaged.

  These belts 7, 8 and 9 are stretched and driven in displacement by rollers 11. These rollers are arranged so as to form, between the two belts 7 and 8, a slot 11, this slot being located above a heel 13 provided, on the one hand, suction means for holding the end of the packaging sheet from the roll 14,

  on the other hand, means for sectioning this sheet.

  Above the belt 7, the frame 5 comprises a support 15 provided with means 151 capable of driving in vertical displacement a horizontal bar 16. Thus, this bar 16 is movable between a high position (see Figure 3) and a low position (See Figure 5c), which after passing through the slot 12, it is applied against the heel 13. On the support 15, there is also provided a horizontal plate 17 movable. between a high position and a low position, this plate 17 being applied, in the low position, on the upper face of the package to be wrapped partially covered with the sheet from the

roller 14.

  The endless belt 8 constitutes the actual wrapping mat and is provided, under the transfer path 10, with four rollers 181, 182, 183 and 184 on which the upper run of the endless belt 8 passes in order to form

a loop 81.

  Thus, according to this embodiment, the rollers 181 and 182 are arranged at the height of the transfer path 10 and delimit between them a transverse slot 19, while the two other rollers 183 and 184 are arranged at one level.

  lower to form this loop 81.

  Above the slot 19, the frame 5 comprises a support 20 on which slides vertically a flap 21 capable of penetrating inside the buckle 81.

passing through the slot 19.

  These rollers 181, 182, 183, 184 are arranged on the frame 5 by means of a carriage on which they are free to rotate, this carriage being movable by a

  movement back and forth along the path of trans-

  10, that is to say in the direction of the arrow F and in the opposite direction of this arrow. It is understood that by moving this carriage in the direction of the arrow F or in the opposite direction, the loop 81 and the slit 19 are moved without the movement of the endless belt 8 being

modified itself.

  After packaging a package by the elements 7, 8, 13, 16, 17 and 21, this package arrives on the endless belt 9 and enters a heated chamber 22 in which is carried out the thermo-shrinking of the film surrounding plastic

the packet.

  In the description above, we did not mention,

  for the purpose of simplification, the means for bonding or heat-sealing the two edges 41 and 42 of the sheet 4 surrounding the package (see Figure 2). These means, which are known in themselves, may be provided either at height of the heel 13, or between the slots 12 and 19 if it is a bonding assembly. On the other hand, if it is a means of assembly by thermo-welding, these means will be

  between slot 19 and enclosure 22 or even within

from this chamber 22.

  The operation of this machine is illustrated

on the figures from Sa to 5g.

  At the beginning of the operating cycle, it is considered that a pack 23 is on the endless belt 7 moving in the direction of the arrow F, while the plastic sheet 14! -Issue of the roller 14 forms a curtain vertically passing through the slot 12, its lower end being held on the heel 13 by

  the suction means that it comprises.

  Continuing its advancement movement in the direction of the arrow F, the package 23 pushes the curtain constituted

  by the sheet 141 by unrolling it from the roll 14 and separating it

  its free end of the heel 13. At this stage, the sheet 141 is disposed partly under the bottom face 231 of the package, it also covers the front face 232 and it

  is preparing to completely cover the upper face 233.

  When the package 23 has passed the slot 12, the two rollers 111 and 112 which define the slot 12 deviate from each other, while maintaining the carpets 7 and 8 under tension, the belt 8 being immobilized. The plate 17 is then lowered in order to apply the sheet 14 to the upper face 233 of the pack, while the bar 16 is lowered through the spaced slot 12, until it comes to apply the sheet of plastics material against the heel 13, which has the effect of cutting the sheet and maintain, by the suction means, the portion 142 of the sheet connected to the roll so that this part is a new curtain for the next package 24. The carpet endless 8 is then put back into operation and the package 23 partially covered with the sheet 141

  moves to slot 19 (Figure 5d).

  When the packet 23 has passed the slot 19, the

  strand 21 descended through this slot to the inte-

  Loop 81, which has the effect of driving the interior of this loop and through the slot, the rear portion of the sheet 141 which extends beyond the

234 rear edge of the package.

  The flap 21 then rises up and then (see Figure 5f) the carriage which rotatably supports the rollers 181, 182, 183 and 184 moves in the direction of the arrow F, which has the effect of moving the slot 19 without causing relative movement of the endless carpet 9

  with respect to packet 23, which are both, preferably

  stillness. During this operation, the part of the sheet 14 introduced into the loop 81 comes against

  the lower face 231 of the pack 23, so that the end

  back of the leaf is superimposed on the front end,

  itself applied against the underside of the package.

  The package is then totally surrounded by the sheet

  of packaging and the endless belt 9 is put into operation again.

  while the carriage comprising the rollers 181, 182, 183 and 184 returns to its initial position (see FIG. 5g). The package 23 then moves to the heat-shrink enclosure 22 after the two superposed ends of the sheet have been suitably

glued or thermo-welded.

  In the embodiment of FIGS. 3, 4 and 5a to 5g, the machine comprises two slots 12, 19 through which, respectively,

  the pre-packaging and packaging of the package by the sheet.

  In the example shown in Figures 6 and 6a to 6e, there is shown a modified construction of this machine in which these two slots 12, 19 are combined into a single slot 24 formed between two endless belts 25 and 26 forming, by their upper strand, a transfer path

  27 for packages to be packaged, for continuous operation.

  The construction of this machine will be described in

same time as its operation.

  According to FIG. 6, which represents the machine in a position taken as starting point of the operating cycle, the pack 28 pushes the curtain formed by the sheet 291 coming from the roll 29, this sheet passing

  by its lower end through the slot 24.

  On either side of the transfer path are arranged two endless chains 30 stretched by the rollers 31, these chains being connected by a transverse bar 32 intended to drive the sheet 291 through the slot 24 and by

  a cutter bar 33 for severing this sheet.

  The cutter bar 33 is arranged after the bar of

  32 in the direction of travel (arrow F1) chains 30 and the cutter bar 33 is intended to cooperate

  with a counter-cutter bar 34 located under the slot 24.

  According to FIG. 6a, the pack 28 continues its pressing movement of the sheet curtain 291 and this advancement movement occurs without discontinuity.

  until the end of the operating cycle.

  According to FIG. 6b, the pack 28 has passed the slot 24 and is surrounded on its upper face, on its front face and partially on its underside, by the film 291. At this stage of the operating cycle, the bar 32 driven by the chains 30 is applied to the film 291 by folding it and pushing it through

of the slot 24.

  According to Figure 6c, the sheet 291 driven by the bar 32, continues its downward movement in the folded state and the cutter bar 33 cooperates with the counter-cutter bar 34 to cut the sheet 291, the slot 24 comprising then the cut rear edge of the sheet 291 and the leading edge of the sheet 292 connected to the roller 29. In the next stage (see Figure 6d) the rollers 251 and 261 of the endless belts 25 and 26 which delimit the slot 24, move in the direction of advancement of the package 28 so that this slot catches the package and that until the roller 251 applies the rear edge of the sheet

  291 under the front edge itself placed under the package 28.

  During this movement, the sheet 292 still attached to the roller 29 is also driven but its lower end remains hanging under the slot 24 in view of

its longer length.

  Finally (see Figure 6e) the rollers 251 and 261 move in the opposite direction of the packet 28 to return to the initial position (Figure 6) to achieve the packaging of a new package 35 by the sheet 292 forming a curtain.

through the slot 24.

  During the recoil movement of the rollers 251 and 261 it will be noted that the rear edge of the film 291 remains applied against the lower face of the pack 28, because of its short length and, therefore, its low weight, whereas, on the contrary , the front edge of the sheet 292 is disengaged from the underside of the pack 28 because the front edge is not completely extracted from the slot 24 and also because of its greater length and thus, its weight

most important.

Claims (10)

  1) Method for packaging a package with the aid of a packaging sheet, characterized in that a package (23) is placed on a transfer path (10) around this package a wrapping sheet (141) so that it covers, at least partially its lower face (231), one of its side faces (232) said front face, and its upper face (233), the the rear edge of the sheet extending beyond the rear side face (234) of the packet, pushing the rear edge of the sheet under the transfer path (10) through a first slot (19) which he is provided and   the slot (19) of the conveyor path is moved relatively   and the package (23) without slipping the package onto the transfer path to place the trailing edge of the sheet (141) under the front edge of that sheet, itself located under the package (23).   2) Process according to claim 1, wherein the packaging sheet (141) is derived from a film roll (14) for packaging packets brought successively to the transfer path (10), characterized in that an operating cycle is established in which the sheet (141) is disposed substantially vertically to the transfer path (10) so as to form a sheet curtain which passes through a second slot (12) of the transfer path ( 10), the free end of the sheet being located under the transfer path, the first of the packages (23) to be packaged is moved onto the transfer path and towards the curtain until the first package is located beyond this second slot (12), the sheet then covering, at least partially, the lower face (231), the front face (232) and the upper face (233), the sheet is pressed by folding it between the first package (23) and a second package (24) until the The folded portion of the sheet penetrates the second slot (12) and transversely severs the folded sheet portion under the transfer path so that the new end (142) of the roll sheet (14) forms a new sheet curtain for the second pack (24), the first pack (23) surrounded by the severed sheet portion (141) being fed to the first slot (19) of the transfer path (10) for its packaging.   3) Process according to claims 1 and 2,   wherein the first and second slits of the transfer path are merged and the sheet (291) is pressed, by folding it, between a first (28) and a second (35) package until the folded portion of the sheet penetrates the single slot (24) and relatively moves the single slot (24) of the transfer path and the package (28) to place the two edges of the severed fold (291, 292) of the sheet under the first package (28). ) then bring back the slot (24) in initial position.   4) Machine for implementing the method   according to claims 1 or 3, characterized in that   comprises an endless belt (9) stretched over rollers (11) and forming a horizontal transfer path (10) for the package (23) to be packaged by means of its upper run, a carriage (181, 182, 183 and 184) under the upper strand of the carpet, this   carriage being movable with a parallel back and forth motion   to the transfer path and having rollers over which the upper run of the belt passes to form a first transverse slot (19) on the path of   transfer, means (21) located above the upper strand   of the carpet, these means being movable towards the upper strand of the carpet to enter the first slot   (19) and drive the sheet into this slot.   Machine according to claim 4, characterized in that the carriage comprises at least three parallel free-rotating rollers (181, 182, 183), two of them (181, 182) being located at the height of the feed path. transfer and determining between them the first slot (19), the third roller (183) being located under the first two, the upper run of the belt passing over these rollers (181, 182, 183) to form a loop (81) under the transfer path, this loop opening through the slot (19) on this transfer path.   6) Machine for carrying out the method according to claim 2, characterized in that the means for driving the sheet by folding in the second slot (12) is constituted by a bar (16) movable alternately between an upper position and a lower position respectively above and below the transfer path (10) through the second slot (12), the bar (16) being in its lower position applying the fold of the sheet (14). ) on a cutting means (13) of leaf.   7) Machine according to claim 6, characterized   in that the cutting means of the sheet are provided on a heel (13) arranged under the second slot (12), this heel also comprising suction means for   maintaining, against this heel, the severed leaf.   8) Machine according to claim 7, characterized   in that the height of the heel (13) is adjustable.   9) Machine according to any one of the claims   cations from 4 to 7, characterized in that the endless belt forming the transfer path by its upper strand, is made using two endless belts (7 - 8; 25 - 26) stretched on rollers and delimiting between them a slit (12, 24).   10) Machine according to claim 9, characterized in that the rollers (111, 112) of the two belts (7, 8) delimiting between them the slot (12) are adjustable spacing.   11) Machine according to claims 4 and 9,   wherein the two slots are combined, characterized in that the movable means towards the upper run of the belt to enter the slot, are constituted by a bar (32) movable in a closed circuit supported laterally to the transfer path by chains for driving the sheet (291) into the slot (24) formed between the rollers (251 and 261), these chains (30) also supporting a cutting bar (33) behind the draft bar (32) of the sheet; relative to its direction of travel, this bar (33) cooperating with a counter-bar   cutter (34) under the slot (24) for sectioning sheet.