EP0794125A1 - Procédé et appareil pour réaliser une bande de déchirement dans des emballages en feuille thermo-rétrécissable - Google Patents

Procédé et appareil pour réaliser une bande de déchirement dans des emballages en feuille thermo-rétrécissable Download PDF

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Publication number
EP0794125A1
EP0794125A1 EP97100650A EP97100650A EP0794125A1 EP 0794125 A1 EP0794125 A1 EP 0794125A1 EP 97100650 A EP97100650 A EP 97100650A EP 97100650 A EP97100650 A EP 97100650A EP 0794125 A1 EP0794125 A1 EP 0794125A1
Authority
EP
European Patent Office
Prior art keywords
heat
weakening
provision
band
pair
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
EP97100650A
Other languages
German (de)
English (en)
Inventor
Mario Gambetti
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.)
Baumer SRL
Original Assignee
Baumer SRL
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 Baumer SRL filed Critical Baumer SRL
Publication of EP0794125A1 publication Critical patent/EP0794125A1/fr
Ceased legal-status Critical Current

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    • 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
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/02—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for perforating, scoring, slitting, or applying code or date marks on material prior to packaging

Definitions

  • the invention relates to a method for obtaining at least one opening tear strip in packages of the heat-shrink type using pieces of sheet of heat-shrink material, a pack obtained in this way and an apparatus for implementing the said method.
  • the invention comes within the specific sector of packaging with pieces of sheet of heat-shrink material, in which the said pieces are first wrapped round the products in the manner of sleeves, and are then heat- shrunk in a hot air oven in order to obtain the adhesion of the said piece close to the product to be packaged.
  • the strip is obtained by producing on the band of packaging in the process of being supplied towards the packing station at least two perforated weakening lines side by side, disposed transversely with respect to the longitudinal development of the said band.
  • the pack obtained has an irregular structural continuity because the tearing lines which delimit the tear strip have undergone modifications during the heat-shrinking which cause, along their development, zones in which an enormous weakening has taken place (tears) and zones where there is no weakening because the perforations have closed.
  • the pack obtained has a tear strip which has an irregular tear strength along its extent for the same reasons as those stated above.
  • these alternative methods provide to produce a light weakening line on the band in the process of being supplied towards the packaging station and/or towards the piece cutting station and to combine it with one or more tear threads/strips.
  • the pack has a very strong pre-cut tear line to maintain the structural continuity of the pack, in which the said tear line can be torn solely by pulling the said tear thread/strip since the latter acts as a knife, and it is not possible to tear it by hand because it is too strong and irregular.
  • -A third disadvantage lies in the fact that the above- mentioned operations require the use of additional apparatus suitable for applying the said tear threads/ strips to the band of packaging and, furthermore, the use of additional devices for cutting the said tear threads/ strips, as well as the use of additional elements for supporting and unwinding the associated spools, comprising an increase in the cost of the packing machine and the associated maintenance.
  • -A fifth disadvantage comprises the fact that by applying the said tear threads/strips, the residual mass of the pack after opening increases and, furthermore, because the said threads/strips comprise a different material from the pack film, the disposal and/or recycling of the said pack waste involves problems.
  • the object of the invention is to eliminate the above unfortunate disadvantages.
  • the invention therefore principally relates to a method for obtaining at least one opening tear strip in packages of the heat-shrink type using sheets of heat-shrink material, wherein provision is made to produce on the said pieces before they are wrapped round the product to be packed at least one pair of weakening lines side by side and intended to determine a tear strip on the heat-shrunk pack, wherein the said method is characterized in that provision is made to manage and vary the degree of weakening along the weakening lines produced on the sheet in relation to the product to be packed, in that provision is made to weaken with greater intensity the sections of the weakening lines intended to undergo a build-up of material during the heat-shrinking phase and in that provision is made to weaken with less intensity the sections of the weakening lines intended to undergo less build-up of material during the heat-shrinking phase.
  • the invention also relates to a pack obtained by means of the above-mentioned method which is characterized in that the tear lines which determine the tear strip on the pack are obtained by means of weakening lines which have a differentiated degree of weakening along their extent and are produced on the sheet of wrapping material.
  • the invention further relates to an apparatus for implementing the above-mentioned method which is characterized in that it provides: a first pair of dragging rollers, located upstream of the said apparatus, suitable for stretching and dragging downstream a band of heat-shrink material; a second pair of dragging rollers, located at a distance downstream of the said first dragging rollers, suitable for stretching upstream and dragging downstream the band of heat-shrink material; and cutting means located between the first pair of dragging rollers and the second pair of dragging rollers, extending transversely with respect to the direction of feed of the band, equipped with adjustment means to vary the degree of cutting along their extent and suitable for cyclically cutting the band as it slides by.
  • the invention which is characterized by the claims, solves the problem of creating a method for obtaining at least one opening tear strip in packages of the heat-shrink type using pieces of heat-shrink material, of creating a pack of the above-mentioned type equipped with a tear strip to facilitate its opening and of creating an apparatus for implementing the said method.
  • the tear strip obtained does not have tear lines having sections with enormous breaks (tears) and sections without breaks; the tear strip does not have an irregular tear strength along its extent; the band of heat-shrink material does not have to be subjected to applications of tear threads/strips; the packing machine does not have to be equipped with apparatus for applying the said tear threads/strips, the packing machine does not have to be equipped with devices for cutting the said tear threads/strips and elements for supporting the associated spools; the pack obtained does not have additions of material; the pack obtained does not have different materials.
  • the advantages obtained by means of the invention essentially comprise the fact that the pack obtained maintains a structural continuity, the fact that the tear strip has a constant tear strength over its entire extent, the fact that high operating speeds can be used with consequent increase in the productive capacities of the packing machines, the fact that jams and/or malfunctions due to the above-mentioned application operations are avoided, the fact that the production costs of the packing machine are reduced, the fact that the packaging production costs are reduced, the fact that the mass of the pack waste after unpacking is reduced and, finally, the fact that the disposal and/or recycling operations of the said pack waste are facilitated.
  • This pack 1 provides a heat-shrunk wrapping 2, obtained from a piece 102 (see Fig. 1b) which has been wound longitudinally y-y round a product 3, in this case a group of six bottles 3a-3f, and then, after having disposed the longitudinal terminal ends 4 and 5 under the product 3, it has been heat-shrunk, obtaining the above-mentioned wrapping 2, wherein the latter has a tear strip 9 defined by the tearing lines 6 and 7 described in greater detail below.
  • Fig. 1A shows the pack of Fig. 1 sectioned along a horizontal plane located between the breaking lines 6 and 7, after shrinking, because of the particular shape of the packed product 3, build-ups of heat-shrunk material form in particular zones of the opening wall of the pack 1.
  • the thickness of the opening wall of the pack 1 provides a thickness which varies in size along its extent and, with reference to the said Figs. 1 and 1A, substantially and diagrammatically, provides a section A of thick thickness, a section B of thin thickness, a section C of thick thickness, a section D of thin thickness, a section E of thick thickness, a section F of thin thickness and a section G of thick thickness.
  • the piece 102 has a terminal end portion 105 intended to form the portion 5 of the pack 1 and a pair of weakening lines 106 and 107 extending transversely with respect to the said line y-y, intended to form the breaking lines 6 and 7 of the pack 1, between which is determined a strip of material 109, also extending transversely, and intended to form the tear strip 9 of the pack 1.
  • the weakening lines 106 and 107 provide segments A', C', E' and G' having a larger degree of weakening and segments B', D' and F' having a smaller degree of weakening.
  • the method described above comprises managing and varying the degree of cutting and/or weakening along the weakening lines 106 and 107 produced on the piece 102 prior to heat-shrinking in relation to the shape of the product to be packed 3a-3f, wherein provision is made to weaken with greater intensity the segments A', C', E' and G' of the weakening lines intended to undergo an increase in thickness further to heat-shrinking and to weaken with less intensity the segments B', D', F' of the weakening lines which do not undergo an increase in thickness further to heat-shrinking, so as to obtain, after heat-shrinking, breaking lines 6 and 7 which have a tensile and tear strength that is substantially constant along their entire extent.
  • a band 202 of heat- shrink material which extends longitudinally along a line y-y, is intended to be cut into longitudinal pieces so that they can then be wrapped round the products 3a-3f in the manner described above.
  • This band 202 has a pair of weakening lines 206 and 207, intended to form the breaking lines 6 and 7 of the pack 1, wherein the cuts 247a, 247b, 247c, etc. and the bridges 248a, 248b, 248c, etc. of a weakening line 206 are arranged staggered longitudinally with respect to the counter-facing cuts 249a, 249b, 249c etc. and associated bridges 250a, 250b, 250c, etc. of the other weakening line 207, determining a strip 209 intended to constitute the tear strip 9 of the pack 1.
  • This embodiment of the weakening lines 206 and 207 after the heat-shrinking of the piece onto the product, comprises the formation of breaking lines 6 and 7 having mechanical tear and separation/tensile strength properties which are different from those of the preceding embodiment and which have particular uses.
  • a band 302 of heat- shrink material which extends longitudinally along a line y-y is intended to be cut into longitudinal pieces so that they can then be wrapped round products 3a-3f in the manner described above.
  • This band 302 has a pair of weakening lines 306 and 307 intended to form the breaking lines 6 and 7 of the pack 1, wherein the said weakening lines 306 and 307 are convergent at the centre and divergent at the ends so as to obtain, following heat-shrinking, which comprises an enormous shrinking of the transverse terminal portions of the band 302, see also Fig. 1, a tear strip 9 having a substantially uniform height.
  • a band 402 of heat-shrink material which extends longitudinally along a line y-y is intended to be cut into longitudinal pieces so that they can then be wrapped round products 3a-3f in the manner described above.
  • This band 402 has a pair of weakening lines 406 and 407, intended to form the breaking lines 6 and 7 of the pack 1, wherein the said weakening lines 406 and 407 determine between them a portion of material 409 which extends transversely and is intended to form the tear strip 9 of the pack 1.
  • the weakening lines 406 and 407 provide a double set of oblique cuts 406a, 406b, etc. and 407a, 407b, etc. disposed in the manner of a fish's backbone with respect to the portion 409, wherein, to vary the degree of weakening, provision is made to vary the length L3, L4 of the cuts and/or to vary the spacing distance D between the successive cuts of each row 406 and 407.
  • the pack 1 has a take-hold tab 75 which is obtained by making a pair of mirror-image continuous lateral cuts, denoted by 71, 71 in Fig. 5B and 72, 72 in Fig. 6B, in the vicinity of the terminal portion of the weakening lines denoted by 306, 307 in Fig. 5B and by 406, 407 in Fig. 6B, so as to obtain a tab-portion denoted by 73 in Fig. 5B and by 74 in Fig. 6B, between the said weakening lines.
  • a band 502 of heat-shrink material extends longitudinally along a line y-y and is intended to be cut into longitudinal pieces so that they can then be wrapped round the products 3a-3f in the manner described above.
  • This band 502 has a pair of weakening lines 506 and 507, intended to form the breaking lines 6 and 7 of the pack 1, wherein the said weakening lines 506 and 507 are separated centrally by a total cut line 574a determining two tear strips 509, 509 extending from the centre outwards.
  • the separation line 547a is associated with a pair of further cut lines 572, 572 so as to determine two tabs 574, 574 which, following heat-shrinking, will form on the pack obtained two central take-hold tabs for pulling the respective tear strips 509, 509.
  • This perforation apparatus 20 is arranged upstream of a cutting station 21 intended to cut pieces 23 from a band 22 of heat-shrink material being fed according to the arrow F, so as then to feed them by means of a conveyor 24 into the wrapping station of the packing machine, as described and illustrated in Italian patent No. 1.246.637 (corresponding to US patent 5.203.144) for example.
  • the perforation apparatus 20 initially provides a first pair of dragging rollers 25 and 26, counter-rotating, wherein the roller 25 provides a rotating shaft 27 on which four rubberized wheels 28a, 28b, 28c, 28d are close-fitted, and the roller 26 provides a rotating shaft 29 on which four corresponding rubberized wheels 30, only the wheel 30c being visible in Fig. 2A, are close-fitted, which wheels are arranged vertically above the wheels 28a, 28b, 28c, 28d and are suitable for cooperating therewith for the feed of the band 22.
  • a first sliding plate 31 extending longitudinally beneath the plane of sliding of the band 22, which plate has slots 32a, 32b, 32c and 32d in which the said rubberized wheels 28a, 28b, 28c, 28d, the tops of which project from them at the top, are inserted.
  • a cutting tool 33 rotating about an axis x, which comprises a shaft 34 which carries a pair of perforating blades 35 and 36, each of which provides a profile with teeth 51 and 52 arranged aligned, only the row of teeth 52a, 52b, 52c, 52d, 52e, 52f, 52g and 52h of which being visible in Fig. 3A.
  • a set of adjustment blocks 37 denoted respectively by 37a, 37b, 37c, 37d, 37e, 37f and 37g, which are adjustably movable radially with respect to the shaft 34 by means of a set of screws 38a, 38b, 38c, 38d, 38e, 38f, 38g having their free ends opposite to the heads rotoidally engaged in the said blocks 37a, 37b etc. and their shanks coupling in a screwable manner inside and through the said shaft 34.
  • a second pair of dragging rollers 39 and 40 wherein the roller 39 provides a rotating shaft 41 on which four rubberized wheels 42a, 42b, 42c, 42d are close-fitted, and the roller 40 provides a rotating shaft 43 on which four corresponding rubberized wheels 44, only the wheel 44c being visible in Fig. 2A, are close-fitted, which wheels are arranged vertically above the wheels 42a, 42b, 42c, 42d and are suitable for cooperating therewith for the feed of the band 22.
  • a second sliding plate 45 extending longitudinally beneath the plane of sliding of the band 22, which plate has slots 46a, 46b, 46c and 46d in which the said rubberized wheels 42a, 42b, 42c, 42d, the tops of which project from them at the top, are inserted.
  • the apparatus 20 described above is also equipped with mechanical and/or electrical and/or electronic and control means to synchronize and control the operation of the said apparatus 20, which are not described or illustrated here because they do not come within the inventive concept of the invention and because they are well-known and may have various configurations.
  • the operation of the apparatus 20 provides, during the feed of the band 22 towards the cutting station 21, the cyclical rotation of the perforation assembly 33 in such a way that the tips 51 and 52 of the perforating blades 35 and 36 interfere with the said band 22 which, being stretched between the pair of rollers 25-26 and 39-40, is inserted in the teeth 51 and 52 of the said blades 35 and 36 until it meets the radially external surfaces of the blocks 37, see Fig. 2A.
  • FIG. 4 and 4A show a particular configuration of the cutting blades of the perforator assembly 33.
  • a pair of perforating blades 235 and 236, equipped with respective perforator teeth 251 and 252 (followed by letter a, b, c, etc. in Fig. 4A) are arranged in such a way that the teeth 251 of the blade 235 are staggered with respect to the teeth 252 of the other blade 236 whilst a set of adjustment blocks 237a, 237b, 237c, etc. is arranged between the said blades 235 and 236 in the manner and for the reasons described above for the first embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP97100650A 1996-02-08 1997-01-17 Procédé et appareil pour réaliser une bande de déchirement dans des emballages en feuille thermo-rétrécissable Ceased EP0794125A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96BO000058A IT1285557B1 (it) 1996-02-08 1996-02-08 Metodo per ottenere almeno una banda a strappo di apertura negli imballaggi del tipo termorestringenti utilizzanti spezzoni in foglio
ITBO960058 1996-02-08

Publications (1)

Publication Number Publication Date
EP0794125A1 true EP0794125A1 (fr) 1997-09-10

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EP97100650A Ceased EP0794125A1 (fr) 1996-02-08 1997-01-17 Procédé et appareil pour réaliser une bande de déchirement dans des emballages en feuille thermo-rétrécissable

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EP (1) EP0794125A1 (fr)
IT (1) IT1285557B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19750429A1 (de) * 1997-11-14 1999-05-20 Gerro Plast Gmbh Verfahren zum Aufbringen einer schrumpfartigen Hülse aus folienartigem Schaumstoff auf eine Flasche oder dergleichen und Flasche oder dergleichen mit einer solchen Hülse
EP1321379A1 (fr) 2001-12-20 2003-06-25 Alessandro Cristofani Film thermoretractable pour bouteilles, procédé de fabrication de ce film, et dispositif pour former des incisions pour lignes d'affaiblissement
EP1785357A1 (fr) * 2005-11-09 2007-05-16 Sealed Air Limited Dispositif et procédé de fabrication d'emballages retrécissables faciles à ouvrir
DE102006011272A1 (de) * 2006-03-10 2007-09-13 Schreiner Group Gmbh & Co. Kg Schrumpf-Foliensiegel und Verfahren zur Versiegelung von Behältern
ITFR20090002A1 (it) * 2009-02-16 2009-05-16 Danilo Gabriele Sistema apertura facilitata fardelli
FR2986509A1 (fr) * 2012-07-11 2013-08-09 Sidel Participations Equipement et procede pour fardeleuse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2016039A1 (de) * 1970-04-03 1971-10-28 E.I. du Pont de Nemours an d Company, Wilmington, Del. (V.StA.) Vorrichtung zum Verpacken von Gegenständen
US4586312A (en) * 1984-04-02 1986-05-06 Pet Incorporated Method for producing heat shrinkable package with a frangible access panel
EP0406136A1 (fr) * 1989-06-29 1991-01-02 Louis Marion Procédé et moyens de fabrication de sachets en papier pour emballer des produits notamment des produits stérilisés, et les sachets obtenus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2016039A1 (de) * 1970-04-03 1971-10-28 E.I. du Pont de Nemours an d Company, Wilmington, Del. (V.StA.) Vorrichtung zum Verpacken von Gegenständen
US4586312A (en) * 1984-04-02 1986-05-06 Pet Incorporated Method for producing heat shrinkable package with a frangible access panel
EP0406136A1 (fr) * 1989-06-29 1991-01-02 Louis Marion Procédé et moyens de fabrication de sachets en papier pour emballer des produits notamment des produits stérilisés, et les sachets obtenus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19750429A1 (de) * 1997-11-14 1999-05-20 Gerro Plast Gmbh Verfahren zum Aufbringen einer schrumpfartigen Hülse aus folienartigem Schaumstoff auf eine Flasche oder dergleichen und Flasche oder dergleichen mit einer solchen Hülse
EP1321379A1 (fr) 2001-12-20 2003-06-25 Alessandro Cristofani Film thermoretractable pour bouteilles, procédé de fabrication de ce film, et dispositif pour former des incisions pour lignes d'affaiblissement
EP1497198A2 (fr) 2001-12-20 2005-01-19 Alessandro Cristofani Emballage a film thermoretractable pour bouteilles, procede de fabrication dudit emballage et equipement de coupe en long utilise avec ce procede
EP1321379B1 (fr) * 2001-12-20 2009-05-27 Alessandro Cristofani Film thermoretractable pour bouteilles et procédé de fabrication de ce film
EP1785357A1 (fr) * 2005-11-09 2007-05-16 Sealed Air Limited Dispositif et procédé de fabrication d'emballages retrécissables faciles à ouvrir
DE102006011272A1 (de) * 2006-03-10 2007-09-13 Schreiner Group Gmbh & Co. Kg Schrumpf-Foliensiegel und Verfahren zur Versiegelung von Behältern
US8181815B2 (en) 2006-03-10 2012-05-22 Schreiner Group Gmbh & Co. Kg Shrink-film seal and method for sealing containers
ITFR20090002A1 (it) * 2009-02-16 2009-05-16 Danilo Gabriele Sistema apertura facilitata fardelli
FR2986509A1 (fr) * 2012-07-11 2013-08-09 Sidel Participations Equipement et procede pour fardeleuse

Also Published As

Publication number Publication date
IT1285557B1 (it) 1998-06-18
ITBO960058A0 (it) 1996-02-08
ITBO960058A1 (it) 1997-08-08

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