US3840997A - Apparatus for wrapping stacked compressible materials in a thermo-shrinkable plastics film - Google Patents

Apparatus for wrapping stacked compressible materials in a thermo-shrinkable plastics film Download PDF

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Publication number
US3840997A
US3840997A US00350462A US35046273A US3840997A US 3840997 A US3840997 A US 3840997A US 00350462 A US00350462 A US 00350462A US 35046273 A US35046273 A US 35046273A US 3840997 A US3840997 A US 3840997A
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article
heating
film
zone
rollers
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US00350462A
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English (en)
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J Lucas
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    • 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
    • B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
    • B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
    • B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
    • B65B53/063—Tunnels

Definitions

  • the apparatus having a wrapping, a heating and a cooling station provided respectively, with lower first, second and third consecutively aligned roller conveyers, which are at the same level and are driven independently at desired times to convey a stack into and out of each station in turn and halting the stack in each station for a desired period.
  • Each station is provided with an upper press member having an upper conveyer mounted on its underside driven in synchronism with the corresponding lower conveyer.
  • the upper conveyers at the heating and cooling stations are maintained at the same level as the upper conveyer at the wrapping station so that the compression of the stack achieved at the wrapping station is main tained'at the other two stations during the film shrinking process.
  • the present invention relates to an apparatus operating in a continuous sequence for wrapping stacked compressible materials in a thermo-shrinkable plastics film.
  • thermo-shrinkable plastics materials are available in the form of films facilitating an automatic and rational operation for wrapping products supplied for sale, the advantages of which are, inter alia, a saving in the cost of the materials used, a reduction in the labor cost, a visible presentation of the product, storage and transportation out of doors without any fear of the action of ambient humidity.
  • This method of wrapping has been decided on for compact and non-deformable products, of any shape, by means of appropriate thermo-shrinkable plastics films.
  • the solution of the packaging problem required a preliminary operation of pressing said product, then keeping it at a reduced volume during the shrinkage of the cover as well as during its cooling.
  • a first drawback of this apparatus resides in the fact that the various operations of pressing, heating and cooling are effected in perpendicular directions.
  • the-press and products are brought into the heating oven by means of a second roller'path perpendicular to the former. Due to this, after passing into the heating oven, the press and products are once more displaced on the second roller path and kept on one of the roller paths for the time necessary for cooling, the press only being released after complete cooling of the plastics envelope. A new cycle of placing the load under pressure and moving it into the heating oven may only take place when said press has been released.
  • the various stages of pre-wrapping the materials, heating the thermo-shrinkable wrapping film and cooling said plastics film may be carried out continuously.
  • pre-wrap the next stack which passes intothe heating oven after the discharge of the preceding stack which is discharged into the cooling station where it is cooled during the heating of the stack admitted to the heating oven.
  • the heating oven is variable in height and is constituted by two half-shells open at one of their sides and movable in an air tight manner with respect to each other.
  • the height of the heating oven is adapted to the height of the stack of materials which makes it possible to limit the production of hot air to the volume of the heating oven,
  • the stations for prewrapping, heating and cooling are constituted by rollers for conveying and supporting the materials to be wrapped, the rollers of each station being able to be rotated in synchronism with the rollers of another operating station such that the materials are displaced in a uniform manner and smoothly when passing from one working stationto another. Due to the alignment of said rollers in the same horizontal plane, the materials are always pressed at the same value.
  • FIG. 11 is an elevational view of the wrapping apparatus according to one embodiment of the invention.
  • FIG. 2 is a plan view of the heating station.
  • FIG. 3 is a sectional view of the heating oven.
  • the apparatus is constituted by different working stations located in a line, connected to each other by sections of roller path constituting a single roller and support path whose various parts and functions will be described hereafter.
  • Station 1 comprising conveying rollers 6 rotated or not rotated is intended to receive a handling palette 9 on which is placed a stack of compressible materials 8.
  • the stack 8 is wrapped by an evelop ll) of thermo-shrinkable plastics material known per se.
  • the stack 8 covered by its envelope 10 without special precautions is brought into a station 2 for putting it under pressure, the conveying and support rollers 6a of which are firstly at the same level as the rollers 6 and secondly rotated by means of a reduction motor 7 and other parts known per se.
  • thisvstation 2 Located in thisvstation 2 is a press provided with a stand 11 and bracket 12, said press being able to displace along the roller path,'i.e., perpendicularly to the generatrices of the conveyor and support rollers 6a; provided on the lower face of the pressure plate are conveyor rollers 16 rotated by reduction motors 17, the upper rollers 16 and lower rollers 6a being driven in synchronism in manner known per se.
  • the pressure plate 15 and rollers 16 being brought into contact with the top of the stack 8 covered with its envelope 10, their descent is controlled by means of a hydraulic cylinder device 13 controlled by a central station 14 so as to apply to said covered stack the desired pressure depending on the nature of the material to be wrapped and which, in the case of corrugated card or folding boxes is of the order of lT/m While the stack 8 is being placed under pressure, the envelope 10 is put in position so that the latter appropriately covers the materials displacing said envelope if necessary and, this is in order that at the time of the subsequent shrinkage of the plastics material, there are no parts of least resistance and parts where said envelope is not applied uniformly against the materials.
  • the latter When the stack 8 has been placed under pressure, the latter is supplied by means of rollers 16 and 6a to a heating station 3 in which is provided a heating oven 19 provided with two doors 2t) and 20a sliding in the direction of the generatrices of the rollers of the roller path.
  • the oven 19 is constituted by at least two halfshells 30 and 31, in the shape of a U and able to be displaced with respect to each other in order to produce with the doors 20 and 20a, a vessel which is closed in an air tight manner by seals 32.
  • conveyor rollers Ma and 6b rotated by reduction motors l7 and 7 such that they rotate in synchronism with each other and with the rollers 16 and 6a of the pressure station 2.
  • the stack 8 passes from station 2 to station 3 continuously and smoothly.
  • the rollers 16a are strictly at the same level as the rollers 16 and since the pressure able to push the upper half-shell 30 onto said stack 8 is also equal to that exerted by the rollers 16 in the station 2, said stack is transferred from station 2 to station 3 under the same pressure. In this way, there is no tendency for the stack to expand between stations 2 and 3 and the heating of the plastics envelope 10 may be carried out appropriately, the stack 8 always being at the height that it must have after cooling.
  • the rollers 16a are made of special plastics material which is resistant to heat or covered by an endless belt 18 made of a fireproof and strong material, for example a metal belt covered with a film of material known by the trade name TEFLON.
  • said belt may be made of asbestos.
  • the rollers 16a provided or not with their belt are secured to the end wall of an internal sleeve 27, in the shape of an inverted U and housed inside the upper half-shell 30.
  • the sleeve 27 partially surrounds the stack 8 and provides between its outer wall and the inner wall of said half-shell 30, an annular space 28 in which circulates hot pulses of air 23, provided with its burner 24 and blower 25.
  • the hot air is channelled towards the stack 8 by means of an aperture 33 defined by the lower edge of the sleeve 27 and the lower curved edge 30a of the half-shell 30.
  • the rollers 16a and the sleeve are dis placed with respect to the stack 8 by any appropriate means such as a press similar to that provided in station 2.
  • the sleeve 27 and the rollers 16a are integral with the press plate, the displacement of said press plate being effected along a stand and by means of a cylinder device associated with a hydraulic central station.
  • the upper part of the oven and said rollers 1611 may be cooled by means of an appropriate cooling circuit known per se and which has not been shown in order not to over burden the drawing.
  • the rollers 16a and 6b are set in rotation, which causes the discharge of the stack 3 from said heating oven and towards a cooling station 4 in which is located a press similar to those described previously, the upper rollers 16b integral with the pressure plate and the lower rollers 6 of the roller path being rotated in synchronism with each other and with the rollers 16a and 6b, the rollers 16b and 6c being strictly at the same level as the rollers 16a and 6b respectively.
  • the stack 8 always kept at the same pressure is displaced along the roller path from station 4 until the plastics envelope It) is completely cooled, said cooling causing, in manner known per se, the shrinkage of said plastics envelope, which is thus applied against the entire surface of the materials such that the latter are appropriately wrapped and without any possiblity of resuming their position before being placed under pressure, the wrapped materials being in the form illustrated in FIG. 1 in the discharge station 5 which is adjacent the station 4 and provided with rollers 6d which are driven or not driven and located at the same level as the rollers 60.
  • the apparatus according to the invention is associ-- ated with a central electronic control means which sets the various conveying rollers in rotation and which controls the opening of the doors 2% and Na in the position illustrated in broken line in FIG. 3.
  • a central electronic control means which sets the various conveying rollers in rotation and which controls the opening of the doors 2% and Na in the position illustrated in broken line in FIG. 3.
  • the central electronic control means only authorises the transfer from station 2 to station 3 when the stack being discharged is completely outside the heating oven W, Le, when it is in the cooling sta tion 4. Moreover, when the height of a pressed stack is determined, the central electronic control means defines the position of the various rollers 1 6a and Mb such that the stack is transferred from one station to the other without the pressure applied thereto varying in any manner whatever.
  • the stoppages and starting up of the reduction motors 7 and 17 as well as the sending of hot air into the oven is programmed depending on the nature of the material to be wrapped. in the same manner, the time during which the plastics envelope is exposed inside the heating oven is variable. This is the reason why this variation is also programmed and controlled by the central electronic control means.
  • station 2 may be eliminated if the heating oven comprises members for positioning the envelope, which are able to be controlled from outside said heating oven. in fact, the station 2 for placing the stack under pressure is dispensible only if the heating oven is equipped with such members.
  • the stack previously covered with its envelope may be sent directly into the heating oven, inside which paratus comprising, in combination, a horizontal antifriction conveyor means for supporting for advancement along a linear path, a pallet carrying an article to be wrapped, said article being covered by a shrinkable plastic film, a compression zone at an upstream position along said path, said zone including a planar pressure plate means in parallel spaced relation to said conveyor means and shiftable toward and away therefrom for squeezing said article between said plate means and conveyor means, drive means on said pressure plate means for engaging the film portion above the upper surface of said article and advancing said compressed article along said path, a heating zone adjacent and downstream of said compression zone positioned to receive articles compressed at said compression zone, said heating zone including a second compression plate means in parallel spaced relation to said conveyor and shiftable toward and away from said conveyor, said sec ond plate means including second drive means for en gaging the film above the upper surface of said article and advancing said article in said direction, heating means at said heating zone for heating said film as the same
  • said heating zone includes a heat chamber, the upper surface of which is defined by said second drive means, said chamber including upper and lower, telescopically interfitting, vertically relatively movable half shells, said half shells having open portions at their upstream and downstream ends to permit passage therethrough of said article and film.
  • heating chamber includes upstream and downstream door portions shiftable in a direction normal to said path between first and second positions, respectively, forming with said ends of said half shells a substantially air impervious enclosure, and in clearing relation of said ends.
  • said upper half shell includes an internal sleeve resistant to heat and adapted to be disposed about said article and film, said sleeve and upper half shell defining therebetween an annular space for the circulation of heated air.
  • At least one of said drive means comprises a plurality of rollers mounted on a said plate means, the lower peripheries of said rollers being in coplanar alignment, and an endless anti-friction belt arrayed about said rollers and having a lower flight engaged against said lower peripheries.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Laminated Bodies (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
US00350462A 1972-04-18 1973-04-12 Apparatus for wrapping stacked compressible materials in a thermo-shrinkable plastics film Expired - Lifetime US3840997A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7213631A FR2181141A5 (fr) 1972-04-18 1972-04-18

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US (1) US3840997A (fr)
DE (1) DE2319485A1 (fr)
FR (1) FR2181141A5 (fr)
GB (1) GB1377454A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616123A (en) * 1984-11-13 1986-10-07 Zagoroff Dimiter S Shrink oven
US5339605A (en) * 1993-03-11 1994-08-23 Signature Packaging Machinery, Inc. Product compressor for shrink tunnel
US20080202072A1 (en) * 2005-10-24 2008-08-28 Hannen Reiner Method and Device For Shrinking a Heat Shrink Film Placed
US20100126122A1 (en) * 2008-05-16 2010-05-27 Krones Ag Packaging machine for packs of beverage containers and related conveying device
EP2740673A1 (fr) * 2012-12-06 2014-06-11 MSK - Verpackungs-Systeme GmbH Procédé et dispositif d'application d'une feuille sur une pile de marchandises
US20140366488A1 (en) * 2012-03-12 2014-12-18 Norbert Vermeulen Device and method for shrinking a shrink film onto a stack of goods
CN104787397A (zh) * 2014-01-16 2015-07-22 珠海格力电器股份有限公司 冷水机组包装袋的热缩方法
CN106275625A (zh) * 2016-08-04 2017-01-04 江苏中大包装材料有限公司 一种均热式热收缩膜加热装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949242A1 (de) * 1979-12-07 1981-06-11 Msk - Verpackungs-Systeme Gmbh, 4192 Kalkar Vorrichtung zum schrumpfen von auf einem gutstapel gezogenen schrumpfhauben
DE3339337A1 (de) * 1983-10-29 1985-05-15 B. Hagemann & Co, 4430 Steinfurt Verfahren und vorrichtung zum einhuellen von packstuecken oder gebinden in schrumpffolie

Citations (10)

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Publication number Priority date Publication date Assignee Title
US2561069A (en) * 1944-01-21 1951-07-17 Kingsburg Cotton Oil Co Baled hay feeding device
US2841270A (en) * 1956-03-21 1958-07-01 Int Paper Box Machine Co Individual presser roll unit
US3156812A (en) * 1962-02-14 1964-11-10 Formatron Inc Oven for shrinking wrappers
US3309835A (en) * 1964-01-23 1967-03-21 Diamond Int Corp Method and apparatus for producing packages with a heat-shrink film
US3402475A (en) * 1965-07-07 1968-09-24 Scott Paper Co Wrapper tightening
US3430358A (en) * 1967-01-30 1969-03-04 Doughboy Ind Inc Shrink tunnel with conveyer and air directing means
US3660962A (en) * 1969-10-13 1972-05-09 Bliss Pack Inc Shrink film package, and apparatus and method for making same
US3711961A (en) * 1970-11-25 1973-01-23 Gilbreth Co Heat shrink tunnel
US3727324A (en) * 1970-09-18 1973-04-17 Despatch Ind Inc Shrink tunnel for palletized loads
US3760154A (en) * 1972-02-29 1973-09-18 Signode Corp Apparatus for heat-shrinking a plastic film on a load

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561069A (en) * 1944-01-21 1951-07-17 Kingsburg Cotton Oil Co Baled hay feeding device
US2841270A (en) * 1956-03-21 1958-07-01 Int Paper Box Machine Co Individual presser roll unit
US3156812A (en) * 1962-02-14 1964-11-10 Formatron Inc Oven for shrinking wrappers
US3309835A (en) * 1964-01-23 1967-03-21 Diamond Int Corp Method and apparatus for producing packages with a heat-shrink film
US3402475A (en) * 1965-07-07 1968-09-24 Scott Paper Co Wrapper tightening
US3430358A (en) * 1967-01-30 1969-03-04 Doughboy Ind Inc Shrink tunnel with conveyer and air directing means
US3660962A (en) * 1969-10-13 1972-05-09 Bliss Pack Inc Shrink film package, and apparatus and method for making same
US3727324A (en) * 1970-09-18 1973-04-17 Despatch Ind Inc Shrink tunnel for palletized loads
US3711961A (en) * 1970-11-25 1973-01-23 Gilbreth Co Heat shrink tunnel
US3760154A (en) * 1972-02-29 1973-09-18 Signode Corp Apparatus for heat-shrinking a plastic film on a load

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616123A (en) * 1984-11-13 1986-10-07 Zagoroff Dimiter S Shrink oven
US5339605A (en) * 1993-03-11 1994-08-23 Signature Packaging Machinery, Inc. Product compressor for shrink tunnel
US20080202072A1 (en) * 2005-10-24 2008-08-28 Hannen Reiner Method and Device For Shrinking a Heat Shrink Film Placed
US7703263B2 (en) * 2005-10-24 2010-04-27 Msk-Verpackungs-Systeme Gesellschaft Mit Beschrankter Haftung Method and device for shrinking a heat shrink film placed
US20100126122A1 (en) * 2008-05-16 2010-05-27 Krones Ag Packaging machine for packs of beverage containers and related conveying device
US7966791B2 (en) * 2008-05-16 2011-06-28 Krones Ag Packaging machine for packs of beverage containers and related conveying device
US20140366488A1 (en) * 2012-03-12 2014-12-18 Norbert Vermeulen Device and method for shrinking a shrink film onto a stack of goods
CN103848006A (zh) * 2012-12-06 2014-06-11 Msk包装系统有限公司 用于将薄膜敷设到货垛上的方法和设备
US20140157724A1 (en) * 2012-12-06 2014-06-12 Reiner Hannen Method and apparatus for wrapping a film around an object
EP2740673A1 (fr) * 2012-12-06 2014-06-11 MSK - Verpackungs-Systeme GmbH Procédé et dispositif d'application d'une feuille sur une pile de marchandises
CN103848006B (zh) * 2012-12-06 2016-11-09 Msk包装系统有限公司 用于将薄膜敷设到货垛上的方法和设备
US10538354B2 (en) * 2012-12-06 2020-01-21 Msr-Verpackungs-Systeme Gmbh Method and apparatus for wrapping a film around an object
CN104787397A (zh) * 2014-01-16 2015-07-22 珠海格力电器股份有限公司 冷水机组包装袋的热缩方法
CN106275625A (zh) * 2016-08-04 2017-01-04 江苏中大包装材料有限公司 一种均热式热收缩膜加热装置

Also Published As

Publication number Publication date
GB1377454A (en) 1974-12-18
FR2181141A5 (fr) 1973-11-30
DE2319485A1 (de) 1973-10-31

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