EP0312868A2 - Méthode et dispositif à enrouler un film autour d'un produit - Google Patents

Méthode et dispositif à enrouler un film autour d'un produit Download PDF

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Publication number
EP0312868A2
EP0312868A2 EP88116750A EP88116750A EP0312868A2 EP 0312868 A2 EP0312868 A2 EP 0312868A2 EP 88116750 A EP88116750 A EP 88116750A EP 88116750 A EP88116750 A EP 88116750A EP 0312868 A2 EP0312868 A2 EP 0312868A2
Authority
EP
European Patent Office
Prior art keywords
film
supply roll
deflection device
braking force
area
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.)
Ceased
Application number
EP88116750A
Other languages
German (de)
English (en)
Other versions
EP0312868A3 (fr
Inventor
Michael Löwe
Jörg Meyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanpack-Gesellschaft Lohss & Co (gmbh & Co)
Original Assignee
Sanpack-Gesellschaft Lohss & Co (gmbh & Co)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanpack-Gesellschaft Lohss & Co (gmbh & Co) filed Critical Sanpack-Gesellschaft Lohss & Co (gmbh & Co)
Publication of EP0312868A2 publication Critical patent/EP0312868A2/fr
Publication of EP0312868A3 publication Critical patent/EP0312868A3/fr
Ceased legal-status Critical Current

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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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles

Definitions

  • the invention relates to a method for wrapping a product with a film, which is unwound from a supply roll and fed to the product via at least one deflecting device which acts on the film with a force that unwinds it from the supply roll and expands it.
  • the invention further relates to a device for wrapping a product with a film, which is stored on a rotatably mounted supply roll and is deflected in the area of at least one rotatably mounted deflection device in the direction of the goods, which unwind the film from the supply roll and stretch it Force applied.
  • the object of the present invention is therefore to improve a method of the type mentioned in the introduction in such a way that the film is subjected to gentle stretching.
  • the object is achieved in that the film is pre-stretched in an area between the supply roll and the deflection device and stretched in an area between the deflection roller and the goods.
  • the pre-stretching ensures that the film in the area of the supply roll is only subjected to slight forces that stretch it.
  • the macromolecules forming the film are oriented in a suitable direction by the pre-stretching, thereby ensuring the stretchability required for the post-stretching.
  • the pre-stretching takes place essentially by braking the supply roll and the post-expansion is carried out essentially by braking the deflection device.
  • the ratio of the pre-expansion to the post-expansion can be influenced as a function of the film material used. In particular it is possible to set an expansion course aimed for at a high processing speed for different film thicknesses and film materials.
  • the forces developed in the area of the supply roll and the deflection device are detected by measuring sensors and fed to an evaluation unit.
  • the evaluation unit controls the supply roller brake and the deflection device brake as a function of the measured values determined.
  • Such monitoring and control can on the one hand easily compensate for material irregularities, and on the other hand damage to the film to be stretched can be excluded with a high degree of certainty even if the forces stretching the film unevenly develop, for example due to a non-centric rotational movement of the goods will.
  • Another object of the present invention is therefore to improve a device of the type mentioned in the introduction in such a way that overloading of the film is largely avoided.
  • a supply roll brake is arranged in the area of the supply roll and a deflection device brake is arranged in the area of the deflection device.
  • the arrangement of brakes both in the area of the supply roll and in the area of the deflection device makes it possible to divide the area of the film expansion into a pre-expansion area and a post-expansion area. This division ensures that the film is gently acted upon by stretching forces in the area of the supply roll and that the macromolecules are aligned. In the subsequent area of post-stretching, the film prepared in the area of pre-stretching can be stretched to the extent necessary without fear of damage to the film.
  • the device can be adapted to different operating conditions by suitably adjusting the braking strength.
  • the brakes are connected to an evaluation unit controlling them, which evaluates signals detected in the area of the brakes, which characterize the respective braking strength, and converts signals that control the braking strength.
  • the evaluation unit can ensure safe operation of the device even under changing operating conditions.
  • a device for wrapping a product (1) with a film (2) consists essentially of a supply roll (3), a deflection device (4) and a drive device (5) which rotates the product (1).
  • a plurality of deflection devices (4) can also be arranged one behind the other in the transport direction (6) of the film (2).
  • the deflection device (4) is designed as a deflection roller (7) which is mounted such that it can rotate and which extends with its longitudinal axis essentially perpendicular to the transport direction (6).
  • a supply roll brake (8) In the area of the supply roll brake (8) and in the area of the deflection device (4) a deflection device brake (9).
  • a pre-expansion area (1o) extends between the supply roll (3) and the deflection device (4) and a post-expansion area (11) between the deflection device (4) and the goods (1).
  • the supply roll (3) and the deflection device (4) are rotatably mounted in the region of a support arm (12).
  • the support arm (12) extends in the vertical direction below the supply roll (3) and the deflection device (4). But it is also possible to arrange the support arm (12) in the vertical direction above the supply roll (3) and the deflection device (4).
  • the brakes (8.9) are mechanical, but it is also possible to provide electrical training.
  • Brake sensors (13, 14) are arranged in the area of the supply roller brake (8) and the deflection device brake (9), which measure the braking forces deployed in the area of the respective brake (8, 9).
  • the brake sensors (13, 14) are connected to an evaluation unit (17) via signal lines (15, 16).
  • the evaluation unit (17) controls the brakes (8, 9) taking into account the data recorded by the brake sensors (13, 14) via control lines (18, 19).
  • the drive device (5) is essentially designed as a mounting surface (2o) which is driven in rotation by a drive (21).
  • the installation surface (2o) is designed as a turntable (22) which is mounted so that it can rotate in the region of its center.
  • the drive energy fed into the drive (21) is detected by a drive sensor (23) and transmitted to the evaluation unit (17) via a signal line (24).
  • the support arm (12) is height-adjustable in the area of a lifting device (25) and its orientation is fixed by an alignment element (26).
  • the film (2) is pulled off the supply roll (3) and guided over the deflection device (4) in the direction of the goods (1).
  • the goods (1) are set into a rotational movement by the drive device (5).
  • the rotational movement of the goods (1) applies tensile forces to the film (2), which on the one hand unwind the film (2) from the supply roll (3) and on the other hand both in the pre-stretch area (1o) and in the post-stretch area (11) stretch the film (2).
  • the pre-treated area is treated in the post-expansion area (11)
  • the film is subjected to the required stretching.
  • the strength of the respective expansion in the areas (1o, 11) can be specified via the strength of the braking in the area of the brakes (8,9).
  • the respective braking force can be automatically specified by the evaluation unit (17) as a function of changing operating conditions.
  • the evaluation unit (17) supplies the brakes (8, 9) with signals that set them via the control lines (18, 19). The device can therefore be operated largely without manual intervention. After the goods (1) have been wrapped sufficiently, the film is cut through, the goods (1) are removed from the area of the drive device (5) and replaced by a new product (1) to be packaged.
  • the supply roll (3) and the deflection device (4) are lifted (25) in the vertical direction via the lifting device (25) adjusted in height and thereby an essentially helically shaped wrapping of the goods (1) is produced.
  • a diameter sensor (27) detecting the diameter can be arranged in the area of the supply roll (3).
  • the diameter sensor (27) enables the braking forces deployed in the area of the supply roll brake (8) to be readjusted as a function of the orientation of the transport direction (6) in relation to the longitudinal axis of the supply roll (3).
  • the transport direction (6) runs with increasing unwinding of the supply roll (3) in a decreasing win angle to the connecting line of the axis of the supply roll (3) and the axis of the deflection device (4). Depending on this angle, the braking force is adjusted manually or automatically by the evaluation unit (17).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
EP88116750A 1987-10-13 1988-10-10 Méthode et dispositif à enrouler un film autour d'un produit Ceased EP0312868A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3734527 1987-10-13
DE19873734527 DE3734527A1 (de) 1987-10-13 1987-10-13 Verfahren und vorrichtung zum umwickeln einer ware mit folie

Publications (2)

Publication Number Publication Date
EP0312868A2 true EP0312868A2 (fr) 1989-04-26
EP0312868A3 EP0312868A3 (fr) 1989-08-30

Family

ID=6338186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116750A Ceased EP0312868A3 (fr) 1987-10-13 1988-10-10 Méthode et dispositif à enrouler un film autour d'un produit

Country Status (2)

Country Link
EP (1) EP0312868A3 (fr)
DE (1) DE3734527A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19516870B4 (de) * 1995-05-09 2005-12-22 Rovema - Verpackungsmaschinen Gmbh Vorrichtung zum Zuführen einer ebenen Folienbahn

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4503658A (en) * 1981-04-06 1985-03-12 Lantech, Inc. Feedback controlled stretch wrapping apparatus and process
FR2528020A1 (fr) * 1982-06-07 1983-12-09 Procter & Gamble Europ Procede et dispositif de regulation du pre-etirage d'un film de matiere plastique, en particulier en vue de l'emballage d'une charge
DE3608182A1 (de) * 1986-03-12 1987-10-01 Roland Man Druckmasch Vorrichtung zur regelung der spannung einer drucktraegerbahn mit einer notstoppeinrichtung

Also Published As

Publication number Publication date
DE3734527A1 (de) 1989-04-27
EP0312868A3 (fr) 1989-08-30

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