US3531873A - Hot air heated shrinking tunnel - Google Patents

Hot air heated shrinking tunnel Download PDF

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Publication number
US3531873A
US3531873A US746357A US3531873DA US3531873A US 3531873 A US3531873 A US 3531873A US 746357 A US746357 A US 746357A US 3531873D A US3531873D A US 3531873DA US 3531873 A US3531873 A US 3531873A
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United States
Prior art keywords
tunnel
hot air
hood
shrinking
air heated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US746357A
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English (en)
Inventor
Hans Beck
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Individual
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Individual
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Publication date
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Publication of US3531873A publication Critical patent/US3531873A/en
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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
    • B65B53/063—Tunnels

Definitions

  • a hot-air circulating system for a tunnel for heat shrinking plastic foil packaging materials comprises two blower systems for circulating air in closed circular paths, each path being disposed in planes perpendicular to each other, with some of the air in one path being commingled with the air in the other path.
  • the invention concerns a hot-air heated shrinking tunnel for goods packed in shrinkable plastic foil, with a conveyer belt for the goods passing through the tunnel in longitudinal direction, with at least one hot-air blower each arranged at the ceiling and floor of the tunnel, for production of circular currents of hot air closed within themselves and directed into the tunnel.
  • An object of this invention is to overcome this disadvantage just described and of proposing an arrangement with the help of which the inside space of a hot-air heated shrinking tunnel can be filled completely with owing hot air, so that considerably better quality packaging can be achieved.
  • this task is solved through the fact that the direction of flow of one current of hot air will run in parallel to the longitudinal section of the tunnel and that of the other current of hot air will run transversely in relation to this plane, in such a manner that both currents of hot air commingle with each other, at least partially.
  • a tunnel hood is arranged above the iioor of the tunnel and, in order to change the effective cross section of the tunnel, the hood, in relation to the floor, can be adjusted in height, whereby the lateral walls of the hood encircle the oor at the sides thereof in telescoping fashion.
  • the additional advantage will be achieved that the inside cross section of the tunnel can be adapated to the height of the goods that are to be wrapped, which makes possible a further improved quality of the packaging with a saving of heat energy in combination with the currents of hot air introduced in accordance with the invention.
  • FIG. 1 shows a longitudinal section of a shrinkage tunnel in accordance with a preferred form of the invention
  • FIG. 2 shows a cross section of the tunnel along the line 2-2 in FIG. 1 and
  • FIG. 3 shows a front view of the tunnel as viewed from the left in FIG. 1.
  • a tunnel oor 2 is mounted tixedly on a supporting frame 1, which oor is covered by a tunnel hood indicated generally numeral 3.
  • a conveyer belt 4 which is permeable to air throughout, which can consist, for example, of an endless conveyer belt which is preferably perforated, guided over rollers 5 and driven in conventional manner which has not been shown in the drawing in detail.
  • the goods wrapped into shrinkable Plastic foil are transported through the shrinking tunnel.
  • the oor of the tunnel and the ceiling 6 of the tunnel, formed by the horizontal part of the hood 3, are provided With recesses 7 and 8, in each of which an impeller of a hot air blower 9 and 10, as well as electrically heating elements 11 and 12 have been arranged.
  • the recesses 7 and 8, whose shapes can be recognized in FIGS. 1 and 2, form guideways for the currents of hot air produced by the blowers 9 and 10.
  • the longitudinal axis of recess 7 in the floor 2 of the tunnel runs in parallel to the longitudinal axis of the tunnel.
  • the longitudinal axis of recess 8 in the ceiling 6 of the tunnel runs transversely in relation to the longitudinal axis of the tunnel.
  • blower 9 lls the tunnel essentially in a longitudinal direction with hot air
  • blower 10 on the basis of its cross directed current 14 ensures that the entire cross section of the tunnel is lled with hot air.
  • the tunnel hood 3 has an approximately U- shaped cross section and it encompasses with its lateral walls 15 and 16 the side Walls 17 and 18 standing upwardly in a telescoping way from floor 2. In this manner it is possible through lifting or lowering the hood 3 of the tunnel to change the effective cross section of the tunnel and to adapt it in correspondence with the cross sectional shape of a material that is to be packaged, which is of a considerable advantage for the sake of a quick shrinkage and for the saving of heat energy.
  • a nut 24 shifts on a screw spindle 2S upon turning of a crank 23.
  • the nut 24 is connected pivotally with a guide element 26, which is slidably seated on an arm of a toggle lever 28 mounted xedly on a shaft 27.
  • the other arm of this toggle lever 28 has been connected pivotally with support 21.
  • the supports 21 and 22 are furthermore sup- 3 ported by levers 29 mounted for rotational movement, one of which likewise is xedly attached on shaft 27 and is moved with lever 28.
  • crank 23 In the operation of crank 23, the toggle lever 28 shifts and carries along the supports 21 and 22 either upward or downward, depending on the direction of rotation of the crank, as a result of which the hood 3 covering the tunnel is moved up or down with columns 19 and 20, which are supported slidably on the supports 2l and 22.
  • guide varies 31 have been arranged inside the tunnel, which can be angularly rotationally adjusted preferably from outside the hood and which serve for the purpose of adjusting the currents of hot air correspondingly and in dependence on the shape of the material that is to be packaged.
  • individually adjustable plates 32 have been arranged by means of which the size of the inlet and outlet openings can be adjusted to the shape of the material 33 that is to be packaged (see FIG. 3).
  • these adjustable plates 32 consist of individual sheetmetal plates with longitudinal holes 34- on which the plates are held by means of adjusting screws 35 at the front sides of the hood 3.
  • Hot-air heated shrinking tunnel for materials packed in shrinkable plastic foil with a horizontal conveyor belt for the goods passing through in a longitudinal direction of the tunnel and having at least one hot air blower arranged at the ceiling and another hot-air blower on the Hoor of the tunnel for producing two respective circular closed currents of hot air directed into the tunnel, each of the respective blowers having an inlet means and at least two horizontally spaced outlet means arranged respectively on opposite sides of the inlet means to direct a current of air toward the conveyor belt, characterized in that the direction of ow of one current of hot air runs in parallel to the vertical plane of the longitudinal section of the tunnel and that of the other current of hot air runs perpendicularly in relation to this plane, in such a manner that one respective current of hot air commingles with the other respective current of hot air at least partially.
  • the tunnel is formed by a hood arranged above the Hoor of said tunnel, which hood can be adjusted with regard to height as compared to the Hoor for a change in the effective cross section of the tunnel, and wherein the side walls of the hood engage with the oor laterally in telescoping fashion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
US746357A 1967-07-21 1968-07-22 Hot air heated shrinking tunnel Expired - Lifetime US3531873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1561983 1967-07-21

Publications (1)

Publication Number Publication Date
US3531873A true US3531873A (en) 1970-10-06

Family

ID=5677658

Family Applications (1)

Application Number Title Priority Date Filing Date
US746357A Expired - Lifetime US3531873A (en) 1967-07-21 1968-07-22 Hot air heated shrinking tunnel

Country Status (5)

Country Link
US (1) US3531873A (enrdf_load_stackoverflow)
CH (1) CH468278A (enrdf_load_stackoverflow)
FR (1) FR1574444A (enrdf_load_stackoverflow)
GB (1) GB1231246A (enrdf_load_stackoverflow)
SE (1) SE336757B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146777A (en) * 1975-11-11 1979-03-27 Black Body Corporation Heat conserver for bell-type ovens
CN103935565A (zh) * 2014-04-10 2014-07-23 湖州众友物流技术装备有限公司 热伸缩包装机
US20160122058A1 (en) * 2014-10-31 2016-05-05 Arpac, Llc Shrink wrap tunnel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3035032C1 (de) 1980-09-17 1982-08-26 Stahlwerke Röchling-Burbach GmbH, 6620 Völklingen Verfahren zum Waermebehandeln von Drahtbunden und Durchlaufofen zur Durchfuehrung des Verfahrens
DE3136667A1 (de) * 1981-09-16 1983-03-24 Brown, Boveri & Cie Ag, 6800 Mannheim Industrieofen mit luftumwaelzung fuer waermebehandlungsverfahren
EP0299094B1 (de) * 1987-07-11 1990-06-13 VfI Gesellschaft für Verpackungstechnik mbH Hebebühne für eine mit insbesondere gestapelten Waren beladene Palette
ITMI20011825A1 (it) * 2001-08-29 2003-03-01 Smi Spa Forno a tunnel di termoretrazione per la produzione di imballaggi in pellicole di materiale termoretraibile e procedimento di imballaggio re
FR3094779B1 (fr) * 2019-04-02 2021-05-14 C E R M E X Constructions Etudes Et Rech De Materiels Pour Lemballage Dexpedition Dispositif de chauffage de lots de produits enrobés et installation de conditionnement par fardelage de lots de produits

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146777A (en) * 1975-11-11 1979-03-27 Black Body Corporation Heat conserver for bell-type ovens
CN103935565A (zh) * 2014-04-10 2014-07-23 湖州众友物流技术装备有限公司 热伸缩包装机
CN103935565B (zh) * 2014-04-10 2016-02-10 湖州众友物流技术装备有限公司 热伸缩包装机
US20160122058A1 (en) * 2014-10-31 2016-05-05 Arpac, Llc Shrink wrap tunnel
US11084616B2 (en) * 2014-10-31 2021-08-10 Arpac, Llc Shrink wrap tunnel

Also Published As

Publication number Publication date
GB1231246A (enrdf_load_stackoverflow) 1971-05-12
SE336757B (enrdf_load_stackoverflow) 1971-07-12
CH468278A (de) 1969-02-15
FR1574444A (enrdf_load_stackoverflow) 1969-07-11

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