EP0888875A1 - Dispositif pour application d'une bandelette d'arrachement - Google Patents

Dispositif pour application d'une bandelette d'arrachement Download PDF

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Publication number
EP0888875A1
EP0888875A1 EP97111249A EP97111249A EP0888875A1 EP 0888875 A1 EP0888875 A1 EP 0888875A1 EP 97111249 A EP97111249 A EP 97111249A EP 97111249 A EP97111249 A EP 97111249A EP 0888875 A1 EP0888875 A1 EP 0888875A1
Authority
EP
European Patent Office
Prior art keywords
tear
strips
blade
rotary body
insert
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.)
Withdrawn
Application number
EP97111249A
Other languages
German (de)
English (en)
Inventor
Pier Carlo Scaliti
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.)
Ferrero OHG
Ferrero SpA
Soremartec SA
Original Assignee
Ferrero OHG
Ferrero SpA
Soremartec SA
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 Ferrero OHG, Ferrero SpA, Soremartec SA filed Critical Ferrero OHG
Priority to EP97111249A priority Critical patent/EP0888875A1/fr
Publication of EP0888875A1 publication Critical patent/EP0888875A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/812—Applying patches, strips or strings on sheets or webs
    • B31B70/8123—Applying strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B50/812—Applying tabs, patches, strips or strings on blanks or webs
    • B31B50/8125—Applying strips or strings, e.g. tear strips or strings
    • B31B50/8127—Applying strips or strings, e.g. tear strips or strings perpendicular to the direction of movement of the webs or the blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B50/812—Applying tabs, patches, strips or strings on blanks or webs
    • B31B50/8125—Applying strips or strings, e.g. tear strips or strings
    • B31B50/8129—Applying strips or strings, e.g. tear strips or strings the webs or blanks moving during application of the strips or strings

Definitions

  • the present invention relates to a device for applying tear-strips according to the preamble to Claim 1.
  • a device of this type is known, for example, from IT-B-1 041 468 (Ferrero) to which GB-A-1 558 998 corresponds.
  • the aforementioned prior documents address the problem of preventing the application of transverse tear-strips from resulting in a need to render the forward movement of the wrapping material intermittent, at least locally. This selection is difficult to reconcile with the very fast speeds of advance which the material is intended to reach in recently-produced packaging machines, particularly in those of the type known as "flow-pack", "form-fill-seal", or "FFS" packaging machines.
  • the solution described in the above-mentioned prior documents provides for the tear-strips to be formed by transverse cutting of a further ribbon of sheet material. The individual tear-strip is then transferred to the wrapping material by means of a rotary member which also acts as a striker element during the cutting of the individual tear-strips and/or as an applicator member for applying the tear-strips to the wrapping material.
  • the aforementioned rotary member is configured substantially as a roller with two transfer elements mounted in diametrally-opposed positions.
  • one of the transfer elements receives a tear-strip just formed as a result of a cutting action performed by a cutter located in a fixed position relative to the structure of the device.
  • the diametrally-opposed transfer element cooperates with a sheet of wrapping material in order to deposit a tear-strip formed in a previous cutting operation.
  • the object of the present invention is to provide a device of the type specified above in which the operation to cut and apply the tear-strips can be rendered quicker and more efficient.
  • a device for applying tear-strips is generally indicated 10. This is a device which, as a whole, goes back the solution described in IT-B-1 041 468 and GB-A-1 558 998, to which reference may usefully be made for a general description of the operating criteria of the device 10.
  • the device in question is usually intended to be associated with a packaging machine, for example, of the type generally known as a "flow-pack” or "FFS" packaging machine.
  • a packaging machine for example, of the type generally known as a "flow-pack” or "FFS" packaging machine.
  • FFS flow-pack packaging machine
  • a machine of the type specified above is intended to be supplied with a ribbon of sheet material F which is to form wrappers for packaging the articles in the packaging machine.
  • the ribbon of sheet material F is unwound from a respective roll, not visible in the drawing but theoretically located at the top of the drawing on the right-hand side, in order then to be transferred towards the so-called "shaper" of the packaging machine; this element is also not shown in the drawings but may be imagined theoretically to be located at the bottom of the appended drawing on the right-hand side.
  • the sheet material F may be constituted, for example, by heat-sealable plastics material or aluminium, possibly of the type which is coated with plastics material, thus giving rise to a so-called "combined" wrapper.
  • the material F is drawn from the supply roll and passed through the device 10 - where the tear-strips are applied - and is then sent towards the shaper of the packaging machine.
  • the ribbon of sheet material F is closed onto itself so as to form a tubular semi-finished wrapper in which the articles to be packaged are inserted in a precisely regulated sequence.
  • transverse tear-strips T have to be applied to the sheet F in precisely spaced positions. These tear-strips are intended to permit regular and neat tearing of the wrappers or packages formed from the sheet F by the user in order to eat, or in general, to use the packaged articles.
  • the device 10 operates on the ribbon of sheet material F in the region of a portion F1 thereof which extends substantially vertically from an upper deflection roller 100 towards a lower deflection roller 102. All of this takes place during a downward movement from above at a given speed which should be kept as constant as possible since it is linked with the speed of operation of the packaging machine (not shown).
  • the device 10 can be regarded as being constituted by a set of functional elements or sub-units.
  • the first of these sub-units is constituted by a source 104 for supplying an additional ribbon of sheet material B which is to be cut transversely relative to its direction of advance so as to form the individual tear-strips T to be applied to the sheet material.
  • the source is constituted by a roll of the material B associated, with the interposition of a set of tensioning rollers, generally indicated 16, with a withdrawal unit 106 constituted, for example, by a roller 108 driven by a respective motor 108a, with an associated opposed pressure roller 110.
  • a guide member 114 Downstream of the unit constituted by the roller 108 and the opposed roller 110, is provided and constitutes the output of the source for supplying the ribbon B.
  • the function of the withdrawal unit 106 is to unwind the sheet material B from the respective roll, causing it to emerge from the member 114 in steps, the size of each step being equal to the width of the tear-strips T to be formed (typically a few mm).
  • a cutting unit 116 is mounted on the framework of the device 10 and comprises a cutter comprising a rotary body 118 having at least one blade 120 with a cutting edge 120a.
  • the blade, or rather the cutting edge 120a extends along a generatrix of a theoretical cylindrical surface the principal axis of which corresponds to the axis of rotation X 118 of the body 118.
  • the body 118 is constituted in practice by a roller or cylinder which rotates about the axis X 118 under the action of a motor (not visible in the drawings) and which carries two blades 120 located in diametrally opposed positions.
  • the rotary cutter 118 can act on the sheet material B coming out of the guide member 114, cutting it into pieces of precisely the desired length corresponding to the width of the tear-strips T. This takes place in cooperation with a fixed blade (or counter-blade) 122 mounted on the framework of the device 10 with its cutting edge extending horizontally immediately downstream of the output of the guide member 114.
  • the rotary member 126 also has a generally carousel-like structure and can rotate about a respective axis X 120.
  • the rotary member 126 carries on its periphery at least one (and, in the embodiment shown, two) diametrally-opposed striker elements or blocks 128 for cooperating with the blades 120 in accordance with criteria which will be described further below.
  • the ribbon of sheet material F (the wrapping material) is advanced at a constant speed determined by the speed of operation of the packaging machine with which the device 10 is associated.
  • the members which draw off the additional sheet B are controlled (in a known manner which does not need to be described in detail herein) so as to unwind the material B in steps, the size of each step being equal to the width of the tear-strips T to be formed.
  • the ribbon B is cut and the tear-strips T are consequently formed as a result of the interaction of the rotary blades 120 with the fixed counter-blade 122.
  • the blades 120 and the counter-blade 122 preferably have complementary scissor-like profiles.
  • the tear-strips formed (at least partially dynamically) as a result of the cutting action on the strip B are transferred from the cutting unit 116 towards the sheet of wrapping material F by the blades 120 themselves.
  • These blades carry respective associated restraining elements formed (in the embodiment illustrated, which is an example, since the same restraining action may also be performed in a different manner, for example, mechanically) in the form of ducts 130 (usually of flattened shape so as to have, on the outer surface of the rotary cutter 112, respective mouth portions 130a substantially comparable to slots (possibly divided up along their length) formed in respective inserts 150 mounted in the body 118.
  • the tear-strips T just formed are intended to be restrained on the ducts 130 (according to known criteria). This is achieved by virtue of the presence, in the rotary body 118, of ducts 132 connected to a source of a vacuum (a sub-atmospheric pressure) by means of respective ducts, schematically indicated 132 in the drawings.
  • the tear-strips T are thus transferred from the cutting unit 116 towards the sheet F and are applied thereto by a precisely synchronized movement, that is, in a manner such that the tangential velocity of the blades 120 is practically identical to the (linear) velocity of the portion F1 of the sheet material F when the or each blade is close to the ribbon F.
  • the striker blocks 128 are mounted on the body of the member 126 in respective radial seats 128a which allow the striker blocks 128 a certain freedom of movement in a radial direction relative to the member 126.
  • This enables each striker block 128 to withdraw slightly inwards relative to the rotary member 126, overcoming the reaction of respective springs 138.
  • the springs 138 associated with the striker block 128 mounted on the right-hand side of the member 126 in the drawing are shown; naturally, however, exactly the same arrangement is provided for the other striker block 128.
  • the gripping of the sheet material F and of the tear-strip T being applied thereto at a particular time can thus be achieved in the form of a resiliently-loaded grip ensured by the ability of the striker block 128 to yield resiliently.
  • the insert if there is only one blade 120 or inserts 150 in which the ducts 130, the respective mouths 130a of which restrain the tear-strips T on the rotary blade 118, are formed, are mounted on the body 118 so as to be movable radially in a manner substantially similar to that described above with reference to the striker blocks 128 mounted on the rotary member 126.
  • the inserts 150 are therefore able to move radially relative to the body 118, that is, in general, towards and away from the axis X 118. It is not, however, essential for the inserts 150 to be flat and/or arranged in a diametral plane relative to the cylindrical body of the cutter 118; the inserts 150 could also be of a different shape, for example, a curved shape, and/or could be mounted obliquely on the body of the cutter 118 so as in any case to be movable between:
  • the mouth 130a of the duct 130 formed in the body of the insert 150 is, so to speak "shielded" by the blade 120 adjacent thereto (in a downstream position in the direction of rotation of the body 118) so that the cutting edge 120a of the blade constitutes the outermost projection of the respective region of the curved surface of the body 118.
  • the cutting edge 120a is thus free to cooperate with the counter-blade 122 (in the region which, in the following claims, is called the "first region" of the path of the blade 120/cutting edge 120a) to cut the tear-strips T from the ribbon B.
  • the mouth portion 130a of the duct 130 projects at least slightly beyond the cutting edge 120a of the respective blade 120 and, by this movement, brings the tear-strip T applied thereto to a projecting position ideal for transfer to the sheet F (in the region of the path called the "second region" of the path in the claims).
  • the movement of the insert or inserts 150 between the two positions described in a manner such that it adopts or they adopt the radially outer position in the angular position of its or their orbital movement in which the transfer of the tear-strip T to the ribbon F takes place can easily be brought about - for example - by means of one or more cams 152 (the profile of which is shown schematically by a broken line in the drawing) or by equivalent actuator means.
  • cams 152 the profile of which is shown schematically by a broken line in the drawing
  • the cam or cams 152 are usually formed so as to have a projecting lobe 156 in the angular region (the second region) of the path of movement of the blades 120 in which the transfer of the tear-strip T to the ribbon F takes place (and hence in the portion of the path farthest to the right in the appended drawing), with provision, however, for them to be returned to and kept in the radially retracted position for the rest of the path.

Landscapes

  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP97111249A 1997-07-04 1997-07-04 Dispositif pour application d'une bandelette d'arrachement Withdrawn EP0888875A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97111249A EP0888875A1 (fr) 1997-07-04 1997-07-04 Dispositif pour application d'une bandelette d'arrachement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97111249A EP0888875A1 (fr) 1997-07-04 1997-07-04 Dispositif pour application d'une bandelette d'arrachement

Publications (1)

Publication Number Publication Date
EP0888875A1 true EP0888875A1 (fr) 1999-01-07

Family

ID=8227012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111249A Withdrawn EP0888875A1 (fr) 1997-07-04 1997-07-04 Dispositif pour application d'une bandelette d'arrachement

Country Status (1)

Country Link
EP (1) EP0888875A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226282A (en) * 1961-06-14 1965-12-28 Molins Organisation Ltd Feeding of webs of material
US3298891A (en) * 1963-06-04 1967-01-17 Beck Mach Corp Charles Mechanism for applying tear strips to wrapper-forming material
DE2930231A1 (de) * 1979-07-25 1981-02-12 Ferrero Ohg Vorrichtung zum anbringen von aufreissstreifen an verpackungsfolien

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226282A (en) * 1961-06-14 1965-12-28 Molins Organisation Ltd Feeding of webs of material
US3298891A (en) * 1963-06-04 1967-01-17 Beck Mach Corp Charles Mechanism for applying tear strips to wrapper-forming material
DE2930231A1 (de) * 1979-07-25 1981-02-12 Ferrero Ohg Vorrichtung zum anbringen von aufreissstreifen an verpackungsfolien

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