EP3424828B1 - Wrapping system with extensible plastic film and relative improved retaining device, and method for wrapping an item - Google Patents

Wrapping system with extensible plastic film and relative improved retaining device, and method for wrapping an item Download PDF

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Publication number
EP3424828B1
EP3424828B1 EP18181207.4A EP18181207A EP3424828B1 EP 3424828 B1 EP3424828 B1 EP 3424828B1 EP 18181207 A EP18181207 A EP 18181207A EP 3424828 B1 EP3424828 B1 EP 3424828B1
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EP
European Patent Office
Prior art keywords
film
item
wrapping
devices
cutting
Prior art date
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Application number
EP18181207.4A
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German (de)
English (en)
French (fr)
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EP3424828A1 (en
Inventor
Davide CORBERI
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Publication of EP3424828A1 publication Critical patent/EP3424828A1/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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
    • 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
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • 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
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/12—Feeding webs from rolls
    • B65B41/14—Feeding webs from rolls by grippers

Definitions

  • the present invention relates to an extensible plastic film wrapping apparatus, in particular a wrapping apparatus and related gripping device for holding such a film.
  • a first major distinction in this technological field is that relating to the used films, which may be of heat-shrinkable or extensible type.
  • a wrapping with extensible film is achieved with machines which wrap the items to be packaged with one or more spirals of a preferably prestretched extensible film.
  • Wrapping takes place by defining a relative rotation of a plastic film spool around the item to be packaged, optionally moving the spool along a movement axis to determine wrapping turns distributed over a certain length.
  • Wrapping can take place according to a vertical axis (for example in the traditional pallet-wrapping machines), along which the item to be packaged is upright, or according to a horizontal axis, along which the items to be packaged are fed. In the latter case, each item is fed to the wrapping station along a conveyor belt or a roller conveyor, which is stopped at this station, then is wrapped with the film and then delivered onto the conveyor belt of the packaging line.
  • performing the wrapping with horizontal axis involves the use of a spool supporting carriage, which is moved along a circular guide, arranged in the wrapping station according to a vertical plane oriented perpendicular to the feeding line of the items and which encircles the conveyor belt.
  • the item is supported only on cantilevered guide means (typically a shelf and any lateral containment rails) which connect the feed portion of the conveyor with a delivery portion.
  • cantilevered guide means typically a shelf and any lateral containment rails
  • these guide means are shaped and designed in such a way as to favour the sliding and pulling out of the packaged item.
  • Critical stages of this packaging process are the initial and final ones, respectively, in which the film must be attached to the item and must then be cut to re-present it to the next item.
  • a holding and cutting gripper is used, conventionally placed below the cantilevered guide means, mounted movable longitudinally to the rotation axis of the supporting carriage.
  • FIG. 1 represents a perspective view of a gripper of the prior art.
  • a straight gripper with a holding axis arranged horizontally and aligned with the rotation axis of the film spool, has a fixed upper jaw 1 and a movable (pivoting) lower jaw 2 which has a scissor closure on the fixed jaw 1.
  • the two jaws are arranged to cooperate in retaining a flap end of film and also to perform, in a position slightly downstream of the retaining line, a cut of the film (with a cutting blade which is not visible in Fig. 1 ).
  • the straight gripper has a length equal to a substantial part of the width of the film and grasps the film from a side edge thereof.
  • the initial flap end of the spool is held by the gripper - stationary in a fixed position - until at least a part of a first turn of film is formed around the item to be packaged, as the spool is displaced in rotation on the spool supporting carriage.
  • the film is partially wrapped around the item and tends to adhere to it naturally, stretched and closely fitted to the corners.
  • the gripper When the spool supporting carriage reaches a position prior to possible interference with the gripper, the latter is retracted longitudinally to withdraw from underneath the carriage. Given the considerable size, in fact, the gripper must be moved away from its position before completing the first film turn, because afterwards it would no longer be possible to pull it out without compromising the packaging.
  • the gripper moves away holding the initial flap with it, so as not to lose film tension, which film otherwise would tend to become loose, thus losing adherence to the item even before completion of a consolidation turn.
  • the gripper pulls the film with it, which film collapses into a plastic material cord that remains tucked between the first turn and the item to be wrapped.
  • this film cord portion is essential to ensure that the initial end of film is not released prematurely, on the other hand, however, it constitutes a side appendix of the packaging, which compromises the aesthetics and functionality of the packaging itself.
  • US5027581 discloses a wrapping apparatus and method, where two gripping units are provided at the opposite edges of the wrapping film.
  • the gripping units are reciprocally moved, transversally to the longitudinal path of the film, by a cam/follower drive unit; a cutting blade is also provided, moving vertically up and down below the film path.
  • the underlying problem of the invention is therefore that of providing an apparatus and a wrapping method as above, which allows to achieve an efficient extensible film wrapping, still using a gripper retaining mechanism, but without the drawbacks described above.
  • a wrapping arrangement for an item, to be wrapped with extensible plastic film comprising a driving ring which drives into rotation a support carriage of a spool of extensible plastic film, on a circular path which wraps an item to be packaged, at least a holding unit of the film being furthermore provided, equipped with a gripping device and a cutting device, and further comprising, on two opposite sides of a plane on which said circular path develops, a pair of holding units arranged on a same operating line transversal to the longitudinal development of the film, each holding unit being provided with gripping devices and with cutting devices which can be brought mutually closer along said operating line.
  • said gripping devices and cutting devices are mounted longitudinally movable in opposite directions.
  • said gripping devices and cutting devices are mounted on guides and are moved backward and forward by respective first movement actuators.
  • second gripping actuators are also provided for mutually opening and closing pairs of jaws of said gripping devices.
  • the first and second actuators are mounted so that said gripping devices may mutually move forward and backward both with said jaws closed and with said jaws open.
  • said cutting devices are designated as complementary and have respective cutting means arranged on two parallel but offset planes.
  • a holding device for a wrapping arrangement as described above, comprising a pair of holding units, opposite and arranged on a same operating line transverse to the longitudinal development of a wrapping film, each holding unit being provided with gripping devices and cutting devices which can be brought mutually closer along said operating line.
  • a method for wrapping an itema is provided by using an arrangement as above, in which the following steps are provided:
  • the method involves subsequently bringing said holding units closer together to grasp and retain respective flaps of opposite side edges of said extensible plastic film, bringing said cutting devices mutually closer to bring respective cutting means to cut said film along a cutting line placed between said gripping devices and said item.
  • a sequence of items to be wrapped runs along a horizontal conveyor line and travels to a wrapping station, stopping on a support shelf.
  • a driving ring which drives into rotation a carriage on which a support shaft of a spool B of extensible plastic film is installed.
  • the driving ring is traditionally arranged on a vertical plane arranged substantially perpendicular to the conveying line for items.
  • the item or load C to be wrapped, when stationary on the support shelf S, is inside the circular path of that carriage, so that a plurality of film P turns can be wrapped around it.
  • a pair of holding units 10 and 20 are arranged opposite to one another on a same operating line transversal to the longitudinal development of the film.
  • the operating line is arranged at a height that is easily accessible to an operator, but in itself is not relevant to the operation of the system.
  • the two holding units 10 and 20 are located at a height immediately below the support shelf S of the item C to be wrapped, as shown in Figs. 2B and 2C .
  • Each holding unit 10 and 20 provides a gripping device 11 and 21 and a cutting device 12 and 22, both mounted movable longitudinally in opposite directions, so as to be mutually approached and moved away from each other.
  • Both the gripping devices 11, 21 and the cutting devices 12, 22 are mounted on guides and are moved backward and forward by respective actuators, for example, pneumatic actuators 14, 15, 24, 25.
  • Additional gripping actuators 16 and 26 are provided for mutually opening and closing pairs of jaws of the gripping devices 11 and 21.
  • the latter have a configuration similar to the traditional one, with a fixed jaw arranged on the horizontal plane and a movable jaw underneath, which abuts against the fixed jaw pivoting from below.
  • the foot print of these clamping devices is however very small compared to the prior art, because they are provided for grasping a short flap of the side edge of the film, as shown in Fig. 4C .
  • the operation of the gripping devices 11 and 21 provides that they can move forward and backward reciprocally both with the jaws closed (tightened) and with the jaws open (released), by the intervention of the gripper feed actuators 15 and 25.
  • the cutting devices 12 and 22 of the two units 10 and 20 are designed as complementary, so as to obtain a more effective cutting of the film P.
  • they preferably have respective cutting means 17 and 27 with a cutting blade oriented respectively with an equal and opposite angle, for example 45° for the blade of the left unit and -45° for the blade of the right unit.
  • the cutting action produced on one side has a component facing upwards which is balanced by a component of the opposing blade directed downwards.
  • the two cutting means 17 and 27 are preferably arranged on two parallel but slightly offset planes, so that the two blades can cross each other along their movement with a scissor effect (see Fig. 3C ).
  • the crossing between the blades takes place in the intermediate zone between the two holding units 10 and 20, in an end-of-stroke position of the actuators 14 and 24 of the cutting devices 12 and 22.
  • a film P is laid ( Fig. 4A ) between a spool B and the item C, with the holding devices 10 and 20 completely spaced apart from each other so as not to interfere with the path of the spool B.
  • the gripping devices 11 and 21 with the open jaws are brought mutually closer until they intercept the area where the two lateral edges of the film are located.
  • the gripping devices 11 and 21 are then clamped, lifting the lower jaw against the upper fixed jaw, so that the two gripping units 11 and 21 firmly grasp the respective opposite lateral edges of the film P ( Fig. 4C ).
  • the gripping devices 11 and 21 move away from each other, keeping the film tightly clamped in the jaws, so as to cause a slight stretching which extends the film transversely ( Fig. 4D ).
  • the cutting means 17 and 27 are brought mutually closer, through the respective actuators 14 and 24, which efficiently cut through the stretched film, until they cross in the central area ( Figs. 3C and 4F ).
  • the blades run along a line located between the gripping devices 11 and 21 and the wrapped item, so as to separate the film P from the item, but leaving the end flap of film coming from the respective spool clamped between the gripping devices 11 and 21 ( Fig 2C ) .
  • the two blades 12 and 22 are withdrawn towards the starting position and the free flap of film remains joined to the item (due to its own elasticity), while the other end coming from the spool B remains held by the two opposite gripping devices 11 and 21.
  • the spool B can be brought into rotation around a new item to be wrapped, laying at least one film turn, even partially against the two opposite gripping devices. Since the clamping devices are of small size - since they are intended to grip only a short flap of film and not the whole film width as in the prior art - the opening movement of the jaws, at least to the extent sufficient to release the film, can take place in any case even if an extensible film turn has been placed on it.
  • the two grippers can be opened to free the film end, which thus remains well stretched and captured under the first wrapping turn. Once the jaws have been opened, the two grippers can be moved away from each other until they return to the initial condition.
  • the system of the invention perfectly achieves the purposes stated in the introduction.
  • the two opposite holding units allow to effectively manage the gripping and cutting of the film; working from opposite sides laterally, the film is always kept well stretched and the formation of the unwanted cord of the prior art is prevented; moreover, since the holding effect occurs only on a small part of the edge of the film and the cutting operation takes place with separate, longitudinally movable means, the footprint of the grippers is minimal and they can hold the film even below the first turn (e.g. between the shelf and the first turn, as in Fig. 2C ), without the wrapping being compromised during the release step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP18181207.4A 2017-07-06 2018-07-02 Wrapping system with extensible plastic film and relative improved retaining device, and method for wrapping an item Active EP3424828B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18181207T PL3424828T3 (pl) 2017-07-06 2018-07-02 Układ do owijania za pomocą rozciągliwej folii z tworzywa sztucznego oraz związane z nim ulepszone urządzenie przytrzymujące i sposób owijania przedmiotu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000075940A IT201700075940A1 (it) 2017-07-06 2017-07-06 Sistema di imballaggio a pellicola estensibile e relativo dispositivo di ritegno perfezionato

Publications (2)

Publication Number Publication Date
EP3424828A1 EP3424828A1 (en) 2019-01-09
EP3424828B1 true EP3424828B1 (en) 2020-05-13

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ID=60294312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18181207.4A Active EP3424828B1 (en) 2017-07-06 2018-07-02 Wrapping system with extensible plastic film and relative improved retaining device, and method for wrapping an item

Country Status (5)

Country Link
EP (1) EP3424828B1 (it)
DK (1) DK3424828T3 (it)
ES (1) ES2805044T3 (it)
IT (1) IT201700075940A1 (it)
PL (1) PL3424828T3 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110510180B (zh) * 2019-09-09 2024-07-09 春禾（深圳）自动化技术有限公司 包装封切机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587796B1 (en) * 1983-04-21 1997-12-23 Newtec Int Packaging machine
US5027581A (en) * 1990-05-30 1991-07-02 Hayssen Manufacturing Company Wrapping method and apparatus
ES2660450T3 (es) * 2014-02-14 2018-03-22 Krones Ag Aparato de embalaje que utiliza película extensible con dispositivo de retención mejorado
ITUB20151033A1 (it) * 2015-05-29 2016-11-29 Aetna Group Spa Macchina avvolgitrice

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2805044T3 (es) 2021-02-10
DK3424828T3 (da) 2020-07-27
IT201700075940A1 (it) 2019-01-06
EP3424828A1 (en) 2019-01-09
PL3424828T3 (pl) 2020-11-30

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