Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
  • B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
  • B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
  • B65B63/022—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles using compressing chambers or plates moving in an endless path
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
  • B65B61/24—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for shaping or reshaping completed packages
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
  • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
  • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
  • B65B9/026—Enclosing successive articles, or quantities of material between opposed webs the webs forming a curtain

Definitions

• the invention relates to techniques for compressing and packaging compressible materials such as, in particular, sets of mineral fiber panels.
• US Patent US 4,501,107 describes a machine for stacking mineral wool mattresses and then compressing them to introduce them in the compressed state into a sort of bag which constitutes the packaging of the product. They remain there during transport and storage until they arrive at the site where, by cutting the envelope, the mattresses are released which resume their original thickness.
• US Pat. No. 4,501,107 provides automatic means for bringing the mattresses into a stack, for compressing the stack, and then for introducing the compressed stack into a bag where it remains in the compressed state.
• the compression means is a plate placed on top of the stack and driven by a piston of a vertical downward movement, while the plate on which the stack rests remains immobile.
• the method described herein is effective but has the drawback of any discontinuous method, the dead time separating the end of one start bagging operation for the next operation. Furthermore, the introduction of the compressed pile into the bag cannot be done without using accessories (essentially two plates, below and above the pile) to maintain the pressure during the introduction, accessories which occupy a significant place in the packaging and which therefore allow significant decompression during their evacuation. In addition, the introduction being made in the bags by rear pushing, there is friction of the edges of the compressed stack against fixed sheets and risks damaging the panels.
• United States patent US 3,717,973 describes a machine for continuously compressing volumes of compressible products, in particular rolls of mineral wool, for introducing them in parallelepiped form, into a sheath of larger dimension where they remain in the compressed state (but less than at the time of their introduction).
• the device described comprises in the lower part a substantially horizontal belt conveyor and in the upper part, a synchronous conveyor which is in two successive plane parts, the first converging with respect to the lower belt and the second which is substantially parallel thereto. At the exit of this second zone, two new horizontal conveyors convey the product which they have kept compressed in the packaging in the form of a sheath.
• Document DE-A-26 01 590 describes a method for packaging elongated packages consisting in particular of rolls of fabric. The process is continuous; while the packages placed lengthwise on a conveyor are driven by it, a packaging film is deposited above it, the width of which is such that it alone can surround the package.
• the carrier is in two parts, each supporting one side of the package. Between the two parts, below, is installed a welding device which makes it possible to form a sheath around the package.
• Document DE-A-26 01 590 also provides that between two successive packages, a suitable device can weld the packaging sheets and cut them to restore their autonomy to the packages.
• the invention sets itself the task of providing a process which makes it possible to effectively compress continuously volumes of compressible products, in particular stacks of mineral wool mattresses.
• the invention provides a packaging method "a volume of compressible material in which the volume is placed between two pressing surfaces and laterally moved relative to the pressing direction while the surfaces approach each on the other and in which the surfaces are parallel planes. This arrangement avoids stressing the volume in shear while it is being compressed.
• the known technique of continuous compression during the transport of the product such as that of US-A-3,717,973 indeed compresses the front of the volume more than the rear, which causes a shearing force detrimental to the product. In the case of mineral wool mattresses in particular, this technique resulted in breakages of fibers, which meant that the product never fully recovered after loosening the compression, its original elasticity.
• the technique must also allow rapid action and which does not deteriorate the elastic properties of the material.
• the invention proposes that the pressing surfaces be those of plates carried by carriages associated two by two and that each of the carriages is associated with a carriage which precedes it and another which follows it, to constitute two trains animated by a constant speed.
• the pressing surfaces approach symmetrically with respect to the volume of compressible material.
• the method of the invention provides that the sheath consists of two strips of packaging film placed above and below the volume of material, that they are entrained with it, that their width allows them to overlap on the sides of the compressed volume and that they are linked to each other on said sides of the volume.
• the packaging film is a plastic film, the strips are bonded by welding without changing the plane and, after assembly, the weld is stressed in shear.
• the invention provides a device comprising two converging conveyors situated one above the other and driven by a constant speed, they comprise carriages supporting flat plates parallel to the same plan, which they entail, the plates of a carrier and the other being superimposed.
• the corresponding flat plates on one conveyor and on the other are symmetrical with respect to a plane which is parallel to them.
• the device of the invention comprises, associated with each conveyor, a distributor of a strip of plastic film arranged so as to bring one strip into contact with the plate of the first lower carriage and another in contact with that of the first. upper carriage; moreover, the strips of plastic film have a width allowing them to be superimposed on the sides of the volumes of compressed material.
• the converging conveyors comprise, downstream, an area where the difference between corresponding plates is substantially invariable.
• the device comprises, in particular in this zone, shaping elements intended to place the edges of the superimposed plastic film strips, flat on the sides of the volumes of compressed material as well as, downstream of the shaping elements, means for welding the edges of plastic film strips such as hot air nozzles.
• FIG. 1 shows an overall view of a machine according to the invention
• Figure 2 shows the upstream end of the machine when switching on a new carriage
• Figure 3 shows the downstream end, the exit of a trolley from the circuit
• FIG. 4 shows a variant according to which, the trolleys move like the steps of an escalator
• FIG. 5 represents the shapers of the edges of the strips of packaging film and a hot air nozzle.
• FIG. 1 represents a line for packaging volumes of a compressible material, in this case a stack 1 of panels 2 of mineral fibers 8 in number here. It is a matter of compressing this stack and packaging it (packing it) without it regaining volume.
• the stack Upon arrival at the entrance to the machine, the stack is placed on a horizontal plate made of a plate 3.
• the plate is rectangular like the panels and the stack is centered on the plate. It will remain on this plate 3 until it leaves the packaging line.
• the plate 3 is supported, like the other nine lower plates and like the 10 upper plates represented, by a carriage 4.
• a carriage 6 In fact, above the stack 1 is another plate 5 identical and parallel to the plate 3 and supported like it by a carriage 6.
• the two carriages 4, 6 advance synchronously while approaching each other. They are each driven by a chain 7, 8 (or two chains, one on each side of the carriage).
• the five lower carriages and the five upper carriages which participate in the pressing of the volume 1 constitute a train which advances regularly, driven by the chains 7, 8.
• the carriages 4, 6 are pulled by the chains 7, 8 to which they are linked by axes each passing through the hollow of a link in the chain while a smooth roller centered on the axis makes it possible to guide the chain.
• the axis 16 linked to the carriage is driven by the link of the chain 7 which it crosses.
• a movable guide element 17 is capable of sliding laterally in the extension of the upper guide part 11.
• the carriage arrives (FIG. 2a), it is in position to the right, but when the carriage starts again (figure 2b), it is located in stop on the left. It will move again to the right during the progression of the carriage so that, when the roller 15 arrives in the connection area 18, the movable guide 17 is in place there to avoid any discontinuity.
• the moving guide 17 can be moved by a jack controlled by a central computer responsible for controlling the entire packaging line. It is however preferable to have a “positive” drive of the movable guide element 17 by the toothed wheel 19 which drives and / or supports the chain 7. This mechanical connection is produced by a connecting rod-crank system not shown.
• the system is different because the movable guide element 20 moves, driving with it the roller 21 which thus passes almost instantaneously from the upper guide part 11 to the lower guide part (back) 13.
• the transfer takes place while the toothed wheel 22 supporting (and possibly driving) the chain 7 makes a U-turn.
• the connecting rod 23, in the retracted position in Figure 3a acts during the rotation of the toothed wheel 22 on the element 20 which rotates around its axis 24 and comes to put ( Figure 3b) the movable guide element 20 vis-à-vis screw of the lower guide portion 13 when the connecting rod 23 is extended.
• FIG. 4 represents a variant of the drive system of the trays which have the function of transporting and pressing the volumes of compressible materials.
• This traditional system the mechanism of which is similar to that of escalators, has the disadvantage of requiring much more space for the return circuit.
• the plates when the plates must move apart to release the compressed products, they cannot remain parallel or horizontal, which does not facilitate handling of the finished products.
• Mixed solutions are also possible, one side of the stacks of panels being supported (or surmounted) by a plate associated with a carriage while the other is supported on a single synchronous conveyor belt so as to avoid slipping. But in this case, the packaging process could not be that described below, it must be adapted.
• the method of the invention also includes an original packaging technique. It is here applied to a volume of compressed material but is also applicable to products whose density does not decrease during their packaging.
• the packaging technique described below or an equivalent technique is an essential complement to the compression method because it alone makes it possible to practically conserve the compressed volume while limiting recovery as much as possible. volume.
• FIG. 1 and in FIG. 4 is shown a system for supplying packaging film 25.
• the film comes from two rollers, not shown. It has a precise width which during the tests was for each of the films 25 equal to half of the perimeter of the compressed volume increased by a few centimeters to allow recovery of the films each constituting half of the sheath which packages and traps the compressed product. .
• the films 25 are guided by rollers 26 so as to come into contact respectively with the plates 3, 5 of the first carriages 4, 6.
• the packaging film projects laterally over the products to be compressed (and, even possibly from the tray 3 itself).
• the edges of the strip fold down on each side of the stack 1.
• the film 25 is preferably driven only by the movement of the carriages, which ensures that the film stretches longitudinally under and on the stack 1 of mattress 2 of mineral fibers.
• the last carriages are in the compression zone, the first two in the packaging zone, where the length of film between plates no longer varies, and the fifth, in the middle, at the transition between the two zones.
• Figure 5 From the start of the packaging area, Figure 5, we placed in the middle area, on each side, conformers whose role is to set up the edges of the film strips 25.
• the edge of the lower film 35 is taken by the shaper 31 and conducted along the support plate 30 (located at a defined distance from the support plate 27) where it is pressed by the roller 32.
• the two edges, upper and lower come into contact and one can realize their joining.
• several means 33 are possible, addition of an external adhesive (hot melt in particular), deposition of a double-sided adhesive that has been introduced at the upstream end of the support plate 30 of the film. lower, or else autogenous welding of suitable plastic films. It is this technique which constitutes the preferred embodiment of the invention.
• the film is a HD polyethylene film (high density) with a thickness of 50 to 100 ⁇ m (tests made with a low density BD film have also given excellent results), the means for achieving the fusion of the material is the heat provided by nozzles which blow air at a temperature between 400 and 650 ° C; the tests were carried out with air heaters from the LEISTER Company.
• a person skilled in the art adapts the air temperature and blowing speed to the speed of movement of the film in front of the nozzles.
• safety devices cut off the hot air supply (or become so) in the event of a line shutdown.
• the packaging technique which has just been described in detail uses a technique of autogenous welding of a plastic film; it would not be departing from the scope of the invention to use a packaging film of another kind or a technique for joining the edges of the different film.
• the means of assembling the edges of the two upper and lower strips which intersect and overlap over a large area could be replaced by an edge-to-edge junction, where the internal face of a film is in contact with the face. internal of the other.
• This technique is not preferred because it solicits the weld or the glued junction in peeling, and this type of assembly is less solid than that which was retained where the joint is stressed in shearing.
• the packets of packaged materials 36 are driven by a conveyor 37. They are associated in a chain in the packaging sheath. Between two packages, the sheath is presented as an empty hose 38.
• the upper part of the machine which can be moved vertically, has been placed so that, at the end of the line, the silk trays, 125 mm apart. We made a measurement of the force exerted, it was 206 decanewtons.
• the packaging film was HD polyethylene 60 ⁇ m thick, the line advancing speed was 20 m / min.
• the volume of the packages was measured. It was 112.5 liters, which corresponds to a compression ratio of around 6.5.
• the stack of products found a height of 950 mm, which corresponds to a loss of thickness per panel, acceptable.
• the released panels regained their nominal thickness, 100 mm.
• the compression and packaging method of the previous tests thus makes it possible to have a packaged product whose compression ratio is the maximum that it is possible to keep with a deformable sheath as packaging.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Auxiliary Devices For And Details Of Packaging Control (AREA)
• Basic Packing Technique (AREA)
• Packaging Of Special Articles (AREA)
• Containers And Plastic Fillers For Packaging (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9478976

Family Applications (1)

Country Status (21)

Families Citing this family (46)

Family Cites Families (30)

• 1996
  • 1996-05-06 ZA ZA963563A patent/ZA963563B/xx unknown
  • 1996-05-08 TR TR96/00378A patent/TR199600378A1/xx unknown
  • 1996-05-09 DE DE69603273T patent/DE69603273T2/de not_active Expired - Fee Related
  • 1996-05-09 CA CA002219636A patent/CA2219636A1/fr not_active Abandoned
  • 1996-05-09 CN CN96193968A patent/CN1184453A/zh active Pending
  • 1996-05-09 WO PCT/FR1996/000693 patent/WO1996036536A1/fr not_active Application Discontinuation
  • 1996-05-09 ES ES96919880T patent/ES2134624T3/es not_active Expired - Lifetime
  • 1996-05-09 NZ NZ308580A patent/NZ308580A/xx unknown
  • 1996-05-09 KR KR1019970708230A patent/KR19990014885A/ko not_active Application Discontinuation
  • 1996-05-09 BR BR9609103A patent/BR9609103A/pt not_active Application Discontinuation
  • 1996-05-09 AT AT96919880T patent/ATE182112T1/de not_active IP Right Cessation
  • 1996-05-09 AU AU58254/96A patent/AU705317B2/en not_active Ceased
  • 1996-05-09 PL PL96323050A patent/PL323050A1/xx unknown
  • 1996-05-09 US US08/952,071 patent/US5979145A/en not_active Expired - Fee Related
  • 1996-05-09 JP JP8534595A patent/JPH11505200A/ja active Pending
  • 1996-05-09 HU HU9802923A patent/HUP9802923A2/hu unknown
  • 1996-05-09 EP EP96919880A patent/EP0825951B1/de not_active Expired - Lifetime
  • 1996-05-09 DK DK96919880T patent/DK0825951T3/da active
  • 1996-05-14 HR HR9505712A patent/HRP960219A2/hr not_active Application Discontinuation
  • 1996-05-14 AR AR33650296A patent/AR001937A1/es unknown
• 1997
  • 1997-11-12 NO NO975196A patent/NO975196L/no not_active Application Discontinuation

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