US3673703A - Shrink-wrap film heating apparatus - Google Patents

Shrink-wrap film heating apparatus Download PDF

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Publication number
US3673703A
US3673703A US108477A US3673703DA US3673703A US 3673703 A US3673703 A US 3673703A US 108477 A US108477 A US 108477A US 3673703D A US3673703D A US 3673703DA US 3673703 A US3673703 A US 3673703A
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United States
Prior art keywords
shrinkage
chamber
air
shrinkage chamber
duct
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Expired - Lifetime
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US108477A
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English (en)
Inventor
Friedrich Wieligmann
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Individual
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Individual
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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
    • 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

Definitions

  • Apparatus for heating shrink-wrap film includes a heating space incorporating a heater element and a fun.
  • a shrinkage [52] [1.8.
  • German utility model specification 1,958,765 shows a heater for shrink-wrap film in the form of a chamber to which warm air can be admitted and through which stacked goods (moulded bricks, for example) are moved on trolleys. Upon completion of the shrinkage process, thedoors of the shrinkage chamber are opened and the loaded trolleys are run out.
  • Another proposed shrink-wrap film heater has a shrinkage chamber to which hot air can be admitted and which is opened when stacked goods shrouded in film are inserted and is closed while hot air is being fed to the film, as well as a heater space housing an air heater and fan, which space can be connected to an air inlet duct and an air outlet duct serving the shrinkage chamber, and cut-off devices for the air inlet and outlet ducts, which close the connections between the heater space and the shrinkage chamber and open a duct for circulating the air within the heater space when the shrinkage chamber is open.
  • An object of the invention is to provide an improved shrinkwrap film heater so as to make the timing of the conveyor trolleys independent of the shrinkage time.
  • a shrink-wrap film heating apparatus comprising a shrinkage chamber to which hot air can be admitted and which is opened when stacked goods loosely shrouded in film are inserted and is closed while hot air is being fed to the film, a heater space housing an air heater and fan, which space can communicate with an air inlet duct and an air outlet duct serving the shrinkage chamber, and cut-off devices for the air inlet and outlet ducts, which can close the connections between the heater space and the shrinkage chamber and open a duct for circulating the air within the heater space when the shrinkage chamber is open, the shrinkage chamber being formed by a hood which is fitted at one side of the heater space and can be pivoted upwardly to open the chamber.
  • heating apparatus for shrinking on to at least one article a shrink-wrap film
  • said apparatus comprising means defining an air heating space and incorporating therein a heating element and a fan, a hood pivoted to the air heating space means and defining a shrinkage chamber which can be opened for the insertion and removal of articles and closed when the shrinkage process is taking place, an air inlet duct providinG communication between the heating space and the shrinkage chamber, an air outlet duct providing communication between the shrinkage chamber and the heating space, flow-control means in the inlet and outlet ducts, and a by-pass duct enabling the hot air flow to by-pass the shrinkage chamber, when the shrinkage chamber is open, said by-pass duct being controlled by said flow-control means.
  • the reference numeral 1 has been used to designate a casing comprising a top 2, an outer wall 3, and a bottom 4.
  • a shrinkage hood 5 is hinged at 6 to the casing top 2.
  • the hinge at 6 enables this hood to be pivoted upwards.
  • a tension device (not shown) is attached to an eye 7 and serves to impart this upward pivotal motion to the hood 5.
  • the duct 12 forms part of the heater space 10 and is separated by a partition 15, from another duct 14.
  • a cut-off device in the form of a flap 16, in front of the passage 11, serves to open and close the ducts 13 and 14.
  • heating elements 21 which heat the air blown by the fan 19. It is also possible, of course, for other kinds of heating elements to be used, such as, for example, gas or oil burners.
  • the duct 13 is bounded by a part 5a of the casing top of the shrinkage hood 5 and by a grid or other metal sheet 22, fixed to the latter.
  • This sheet 22 contains slots 23,- the efi'ective size of opening of which can be varied by means of sliding shutters 24. This adjustment facilitates the distribution of the air in the shrinkage chamber 9.
  • the floor of the shrinkage chamber 9 is formed by a trolley 25, which runs on rollers 26 and 27, along rails 28 and 29, the dimensions of the trolley bottom or platform 30 being precisely the same as those of the bottom of the shrinkage chamber 9.
  • a number of such trolleys 25 is arranged in succession to form an endless belt, so that the trolleys 25 emerging from the shrinkage chamber 9 and forthwith. unloaded are brought back, for a further run through the shrinkage chamber 9, on to the rails 28 and 29 that constitute the top track, by means of a track (not shown in the drawing) situated below the rails 28 and 29.
  • Each trolley bottom 30 is inclined at an angle such that the goods 31, shrouded in the their shrink-film covers, slide on the trolley bottom 30 towards the outer side 5b of the shrinkage hood 5 and come up against a strut 32 or other stop.
  • the trolley bottom 30 is hollow, so that the heated air entering the shrinkage chamber 9 flows past the goods 31 and into the space 33 in the trolley bottom 30, through which it passes, emerging from an outlet 34 in the underside plate 3000f the trolley bottom 30, and is directed by trunking 35 fixed-to the plate.30a,to an admission aperture 36. Then the air passes through a passage 37 to the radial fan 19.
  • the admission aperture 36 is fitted with a cut-off member in the form of a flap 38.
  • the operation of the two cut-offs 16 and 38 can be controlled either by the hood 5 or independently thereof, the effect being that during the shrinkage process, when the hood 5 is down, the two ducts 13 and 37 are opened and the duct 14 is closed at the air admission end, whereas, when the hood 5 is raised, the two ducts l3 and 37 are closed and the duct 14 is opened.
  • the mode of operation of the heating apparatus in accordance with the invention is as follows:
  • the hood 5 is lowered and the shrinkage process begins.
  • the radial-flow fan 19 blows air into the duct 12, where it is heated to the requisite shrinkage temperature by the heater elements 21. From there, the heated air flows through the passage 11 into the duct 13, passes through the slots 23 into the shrinkage chamber 9 and flows round the goods 31, so that the shrink-wrap film is raised to the shrinkage temperature.
  • the air is led away through the space 33 in the trolley bottom 30, which directs it through the outlet 34 into the trunking 35.
  • the air then flows through the fan inlet 36 and on through the passage 37, whence it is drawn by the fan for re-use.
  • the hood 5 On completion of the predetermined shrinkage time, the hood 5 is pivoted upwardly and the packedgoods stand free, the shrink-wrap .film being then surrounded by ambient air so that it can cool and contract.
  • the air is now driven round a reduced (by-pass) circuit, past the electric heater elements 21 in the duct 12 and into the duct 14, whence it is led back to the fan 19.
  • the trolleys 25 having been indexed, the shrinkage process is repeated, the hood 5 being lowered over the goods 31 newly run into position, while the position of the flaps 16 and 38 is changed simultaneously to enable the air that has already been pre-heated in the by-pass circuit to pass from the heater space to the shrinkage chamber 9.
  • the shrinkage hood can be pivoted so as to leave the packed goods free, thereby enabling the film to cool and contract, without the trolleys having to be moved at set intervals. Hot air is admitted to the shrinkage chamber only when the hood is down.
  • the timing of the conveying trolleys becomes independent of the shrinkage time. Only one conveying system is therefore required, this being controlled not by the shrinkage time, but by the loading, shrink-wrap film covering and/or unloading of the goods being packed.
  • Heating apparatus for shrinking on to at least one article a shrink-wrap film said apparatus comprising means defining an air heating space and incorporating therein a heating element and a fan,
  • a by-pass duct enabling the hot air flow to by-pass the shrinkage chamber, when the shrinkage chamber is open
  • said by-pas duct being controlled by said flow-control means.
  • said flow-control means comprise pivotal flap valves.
  • Apparatus accordin to claim 1 comprisin an arr inlet grid in the s rmkage chamber, an

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Packages (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
US108477A 1970-01-22 1971-01-21 Shrink-wrap film heating apparatus Expired - Lifetime US3673703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2002786 1970-01-22

Publications (1)

Publication Number Publication Date
US3673703A true US3673703A (en) 1972-07-04

Family

ID=5760245

Family Applications (1)

Application Number Title Priority Date Filing Date
US108477A Expired - Lifetime US3673703A (en) 1970-01-22 1971-01-21 Shrink-wrap film heating apparatus

Country Status (5)

Country Link
US (1) US3673703A (fr)
CH (1) CH529007A (fr)
DE (1) DE2002786B1 (fr)
FR (1) FR2075822A5 (fr)
GB (1) GB1265778A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939575A (en) * 1974-12-04 1976-02-24 Tasope' Limited Dryer unit for printing plates
US4106430A (en) * 1976-03-26 1978-08-15 Nippon Paint Co., Ltd. Single chamber type coating and baking apparatus
US4149354A (en) * 1976-11-25 1979-04-17 Fritz Noack Shrink wrapping apparatus
WO1981000448A1 (fr) * 1979-08-09 1981-02-19 A Karlsson Procede d'alimentation en energie calorifique d'une chambre de sechage et chambre de sechage pour l'application de ce procede
US5155799A (en) * 1989-11-27 1992-10-13 Tetra Alfa Holdings S.A. Heating apparatus for packaging materials utilizing heated air recirculation
US5400570A (en) * 1993-05-17 1995-03-28 Bennett; Charles J. Method and apparatus for heat shrinking film around a product
US6108931A (en) * 1997-02-01 2000-08-29 Babcock-Bsh Gmbh Continuous dryer for flat workpieces
US7363728B1 (en) * 2004-07-20 2008-04-29 Belco Packaging Systems, Inc. Shrink wrap tunnel with variable set points

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1024614B (it) * 1976-03-03 1978-07-20 Torre F Macchina confezionatrice per il confezionamento di prodotti vari in una pellicola di materiale ternoretraibile
GB1603816A (en) * 1977-09-26 1981-12-02 Grace W R & Co Shrinking method shrink tunnel and shrunk package formed therein
NO900771L (no) * 1989-03-10 1990-09-11 Msk Verpackung Syst Gmbh Anordning for behandling av krympeplast.
DE202007018402U1 (de) * 2007-10-16 2008-07-10 Krones Ag Schrumpftunnel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399506A (en) * 1965-04-01 1968-09-03 Grace W R & Co Process and apparatus for simultaneously heat sealing and heat shrinking film
US3430358A (en) * 1967-01-30 1969-03-04 Doughboy Ind Inc Shrink tunnel with conveyer and air directing means
US3586516A (en) * 1969-04-18 1971-06-22 Fred C Smith Meat defrosting apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399506A (en) * 1965-04-01 1968-09-03 Grace W R & Co Process and apparatus for simultaneously heat sealing and heat shrinking film
US3430358A (en) * 1967-01-30 1969-03-04 Doughboy Ind Inc Shrink tunnel with conveyer and air directing means
US3586516A (en) * 1969-04-18 1971-06-22 Fred C Smith Meat defrosting apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939575A (en) * 1974-12-04 1976-02-24 Tasope' Limited Dryer unit for printing plates
US4106430A (en) * 1976-03-26 1978-08-15 Nippon Paint Co., Ltd. Single chamber type coating and baking apparatus
US4149354A (en) * 1976-11-25 1979-04-17 Fritz Noack Shrink wrapping apparatus
WO1981000448A1 (fr) * 1979-08-09 1981-02-19 A Karlsson Procede d'alimentation en energie calorifique d'une chambre de sechage et chambre de sechage pour l'application de ce procede
US5155799A (en) * 1989-11-27 1992-10-13 Tetra Alfa Holdings S.A. Heating apparatus for packaging materials utilizing heated air recirculation
US5400570A (en) * 1993-05-17 1995-03-28 Bennett; Charles J. Method and apparatus for heat shrinking film around a product
US6108931A (en) * 1997-02-01 2000-08-29 Babcock-Bsh Gmbh Continuous dryer for flat workpieces
US7363728B1 (en) * 2004-07-20 2008-04-29 Belco Packaging Systems, Inc. Shrink wrap tunnel with variable set points

Also Published As

Publication number Publication date
FR2075822A5 (fr) 1971-10-08
CH529007A (de) 1972-10-15
DE2002786B1 (de) 1970-11-12
GB1265778A (fr) 1972-03-08

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