EP2960048A2 - Verfahren zur herstellung von rollen aus vorgeschnittenen beuteln mit gestanzten griffen - Google Patents

Verfahren zur herstellung von rollen aus vorgeschnittenen beuteln mit gestanzten griffen Download PDF

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Publication number
EP2960048A2
EP2960048A2 EP15173990.1A EP15173990A EP2960048A2 EP 2960048 A2 EP2960048 A2 EP 2960048A2 EP 15173990 A EP15173990 A EP 15173990A EP 2960048 A2 EP2960048 A2 EP 2960048A2
Authority
EP
European Patent Office
Prior art keywords
tubular film
welding
bags
handles
punching
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Withdrawn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
EP15173990.1A
Other languages
English (en)
French (fr)
Other versions
EP2960048A3 (de
Inventor
Roberto Trezzi
Maurizio Toniato
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.)
Mobert Srl
Original Assignee
Mobert 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 Mobert Srl filed Critical Mobert Srl
Publication of EP2960048A2 publication Critical patent/EP2960048A2/de
Publication of EP2960048A3 publication Critical patent/EP2960048A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/06—Handles
    • B65D33/065—Integral handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • 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
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/142—Cutting, e.g. perforating, punching, slitting or trimming using presses or dies
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/148—Cutting-out portions from the sides of webs or sheets
    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
    • 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
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/872—Forming integral handles on bags
    • 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
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/874—Forming integral handles or mounting separate handles involving punching or cutting

Definitions

  • the present invention relates to a method for the manufacture of rolls of pre-cut bags with punched handles
  • the present invention relates to a method for the manufacture of rolls of pre-cut bags of the shopper type and with punched handles, especially of the type with base of the so-called "star” or “tomato” type typically, but not exclusively, used in supermarkets for the insertion and subsequent weighing of fruit, vegetables and similar foods sold loose or non-pre-packaged.
  • the bags of the shopper type can be of the "extended” or “flat” type or with a "star” or “tomato” base.
  • Said latter types tend increasingly often to replace the bags of the "flat” type in that they have the advantage of solving the disadvantage of the typical fragility of the "flat” bags at the point in which the gusset ends and the bag, as is known, passes from four to two thicknesses of plastic film.
  • the bags or shoppers with "star” or “tomato” base are typically and traditionally made from a tubular film 10 in plastic material or the like ( Figure 1 ) which is completely gusseted along the side edges to define two opposite gussets 12 and 14 with longitudinal development ( Figure 2 ), single folded ( Figure 3 ) with a special folding device along a median longitudinal axis 17 and, subsequently, subjected to an operation of transverse welding to weld handles 11 and a base of each bag 15 ( Figure 5 ).
  • the welding of the handles 11 is performed using a band or strip of Teflon which, interposed in the gusset, more specifically between the gusset 12 and the gusset 14 of Figure 3 formed following single folding of the tubular film, allows the welding of the gussets preventing the handles also from being welded one to the other. More particularly said strip or band of Teflon separates the two handles of the bag, allowing an upper welding device to weld a handle or grip and a lower welding device to weld the other handle, preventing said two handles from being welded one to the other (as schematised in Figures 4 and 5 by the welding line 9).
  • the handles 11, as is known, are obtained through punching performed before or after the welding of the base.
  • This punching in Figure 4 the portion defining the shape of the bag is denoted by 13
  • WO 2010/108944 describes such a method for the production of shopper bags with "star” or “tomato” base and therefore has the disadvantages stated previously.
  • the object of the present invention is that of obviating the disadvantages stated above. More particularly the object of the present invention is that of providing a method for the manufacture of rolls of pre-cut bags with punched handles apt to perform the welding of the handles and of the base of the bag in a single phase without the need for double movements.
  • a further object of the present invention is that of providing a method which does not need regulation of the distance between the welding bars as the length of the bag to be manufactured varies.
  • a further object of the present invention is to make available to users a method for the manufacture of bags apt to ensure a high level of resistance and reliability in time of the product obtained and such, moreover, as to be easily and economically produced.
  • a method for the manufacture of a roll of pre-cut bags with punched handles, of the type with "star” or “tomato” base comprising the steps of sliding movement of a tubular film in plastic material, formation of two opposite gussets along side edges of said tubular film, single folding of said gusseted tubular film along a median longitudinal axis, insertion of a layer of Teflon between said gussets of the single-folded tubular film with function of insulant to prevent the first gusset and the second gusset from being able to weld to each other, formation of a line of transverse pre-cutting apt to define a line of separation between single bags of said tubular film, formation of a transverse welding band at a base of the single bag and of a transverse welding band at handles of the adjacent bag, punching of the single-folded tubular film to define handles of the bags, winding of said tubular film to form a roll of bags, with the
  • upstream and downstream are referred to the direction of forward movement of the film, understanding “downstream” to be an operation which takes place in a more advanced position with respect to another in the direction of forward movement of the film.
  • the method for the manufacture of rolls of pre-cut bags with punched handles comprises a sequence of steps of processing performed on a tubular film 10 which is made to move forwards in the direction indicated by the arrow Y in Figure 6 with the handles or grips 11 of the single bags 15 positioned at the head with respect to the bases (substantially with said punchings or regions of the grips/handles in an opposite position with respect to the traditionally known arrangement).
  • Said automatic apparatus is fed continuously by at least one tubular film 10 which is gusseted and single-folded in longitudinal direction according to traditionally known methods to define a strip which is made to transit in a welding and pre-cutting station 18 (described in detail here below) having the function of welding the handles and the base of the bags and in a punching station having the function of obtaining the handles 11 of the aforementioned bags, with said punching station which can be positioned upstream or downstream of the welding and pre-cutting station.
  • a welding and pre-cutting station 18 described in detail here below
  • This known apparatus is, likewise, provided with means for stopping the tubular film 10, having the function of stopping the sliding of a portion of said film at least with respect to the welding and pre-cutting station 18 in such a way as to be able to perform the operations of welding and, optionally, also those of punching in an optimal way, that is to say with the tubular film practically at a standstill, without stopping the feeding of the same.
  • the welding and pre-cutting station 18 is schematised which comprises two opposite welding bars, an upper welding bar 20 and a lower welding bar 22, placed transversely to the tubular film 10, which can be moved reciprocally towards/away with respect to the tubular film 10 slidingly placed between said opposite welding bars.
  • the upper welding bar is mobile while the lower one is fixed or, alternatively, the upper welding bar is fixed while the lower welding bar is mobile or, again, both the welding bars are mounted mobile.
  • the upper welding bar 20 and the lower welding bar 22 each comprise a film blocking element, respectively, upper 24 and lower 26, tendentially U-shaped and co-operating one with the other to block the tubular film during the phase of welding and pre-cutting.
  • the upper film blocking element 24 of the upper welding bar 20 houses a pre-cutting blade 28 having the function of forming a pre-cut 23 in transverse direction of the tubular film 10 during the phase of welding.
  • This transverse pre-cut defines substantially a line of separation between the bags 15 of the tubular film 10 apt to facilitate the separation between the same for use.
  • the lower film blocking element 26, on the opposite side with respect to the tubular film 10, co-operates with a series of contrast springs 30 for the function described here below.
  • the upper welding bar 20 and the lower welding bar 22 comprise, respectively, a pair of upper welding resistors 32 and 32' and a pair of lower welding resistors 34 and 34' parallel and opposite one to the other and apt to come into contact with the upper and lower surface of the tubular film to perform the welding of the same.
  • the upper 32 and lower 34 welding resistors have the function of forming a transverse welding line 16 at the base of the single bags, while the upper 32' and lower 34' welding resistors have the function of forming a further transverse welding line 9 of the handles 11 of the same bags 15.
  • the upper 32' and lower 34' welding resistors are provided with at least one strip 36 in Teflon placed between said welding resistors and the upper 20 and lower 22 welding bars with function of insulant (one strip in Teflon attached to the upper welding bar and placed between the upper welding bar and the upper welding resistors and a similar strip in Teflon fixed between the lower welding bar and the lower welding resistors).
  • the upper welding resistors 32, 32' and the lower welding resistors 34, 34' are likewise provided with a further strip 36' likewise in Teflon, placed between the upper welding resistors 32, 32' and an upper layer of the tubular film 10 and between the lower welding resistors 34, 34' and a lower layer of the same tubular film, with said strips of Teflon having the function of protecting said welding resistors and preventing the material to be welded from adhering to the same resistors.
  • a layer of Teflon 38 is likewise placed inside the tubular film 10 and, more particularly, inserted between the first gusset 12 and the second gusset 14 of said single-folded tubular film as described above and as schematised in Figure 3 .
  • said layer of Teflon 38 is restrained, placed on a plane parallel to that of the tubular film 10, to an attachment rod 40 placed at the upper and lower welding bars and attached to the welding and pre-cutting station 18 so as to maintain said layer of Teflon 38 between said first gusset and said second gusset of the tubular film 10.
  • the layer of Teflon 38 is inserted between the first gusset 12 and the second gusset 14 of the single-folded tubular film 10 at the upper welding resistor 32' and the lower welding resistor 34', i.e. at the zone intended for the transverse welding 9 of the handles 11. In this way the layer of Teflon 38 performs an insulating function apt to prevent the first gusset 12 and the second gusset 14 from welding one to the other.
  • the station of punching of the bags 15 (not shown in the drawings) is placed downstream of the welding and pre-cutting station 18 with the punch placed at a distance corresponding to the length of the bag to be manufactured or, alternatively, upstream of said station of welding and pre-cutting.
  • this punching can be performed with a total ( Figure 9 ) or partial ( Figure 10 ) removal of material of the tubular tape 10 or, likewise, with pre-cutting of the same tubular tape ( Figure 11 ).
  • the dimension of the punching corresponds to the dimension of the handles which are intended to be formed.
  • a portion of punching 13 is defined with shape and length corresponding to the type of handles which are intended to be manufactured and, taking account of the direction of forward movement of the tubular tape 10, said portion of punching 13 has a mouth 13' turned at the base of the bag 15 and the direction of forward movement of the tubular tape 10 with the consequence that an entry of air may occur in the bag 15 during the forward movement of the tubular tape.
  • the tubular film 10 is charged with electrostatic charges of opposite sign on the two surfaces of the film in such a way that, due to the effect of the electrical attraction, said surfaces remain electrostatically adhered.
  • a turn or fold 43 is formed, created by means of a folding of a flap of the mouth of the punching at a corner and turned in the direction of the base of the bag.
  • the turn or fold 43 is formed due to the effect of the speed of forward movement of the tubular film and co-operates with the electrostatic action in order to close the mouth 13' with respect to the entry of air in the bags.
  • the apparatus for the production of bags is traditionally provided with an extractor hood (not shown in the drawings) having the function of aspirating the punching scrap and whose flow of air, during the sliding of the tubular film 10, sucks in a flap of punching 13 which, by folding, defines the turn or fold 43 preventing, in this way, accidental entry of air in the bag 15.
  • a partial punching of the tubular film 10 is performed with removal of the scrap at each bag 15 and defined by a punching window 44 closed at the edge of folding of the tubular film 10 by a flap 46 of film provided with lines of transverse pre-cutting in such a way as to allow easy removal thereof in a successive phase.
  • This embodiment avoids the formation of the turn or fold 43 which is present in the case of punching for total removal of the scrap described previously.
  • Figure 11 shows schematically a further alternative embodiment for the punching defining the handles 11, which does not comprise total or partial removal of scrap, but instead a pre-cut 48 apt to be removed in a successive phase for the forming of the handles 11 of the bag 15 (for example before the station of rolling or when a single bag is detached from the rolled tubular tape 10).
  • the bags 15 formed in this way (welded and pre-cut) on the tubular tape 10 are wound around an axis of winding at a rolling station to define rolls of bags conveyed, subsequently, to an unloading station.
  • the method for the manufacture of rolls of pre-cut bags with punched handles of the present invention allows advantageously the welding of the handles and of the base of the bag to be performed in a single step without the need for double movements and without the need to regulate the distance between the welding bars as the length of the bags to be produced varies.
  • the direction of forward movement of the tubular tape allows the welding of the handles of a bag to be performed upstream of that of the base of the preceding bag without the need to have to continuously extract and insert the layer of Teflon 38 between the first gusset 12 and the second gusset 14 of the tubular film 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
EP15173990.1A 2014-06-26 2015-06-26 Verfahren zur herstellung von rollen aus vorgeschnittenen beuteln mit gestanzten griffen Withdrawn EP2960048A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20141162 2014-06-26

Publications (2)

Publication Number Publication Date
EP2960048A2 true EP2960048A2 (de) 2015-12-30
EP2960048A3 EP2960048A3 (de) 2016-03-23

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EP15173990.1A Withdrawn EP2960048A3 (de) 2014-06-26 2015-06-26 Verfahren zur herstellung von rollen aus vorgeschnittenen beuteln mit gestanzten griffen

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114043778A (zh) * 2021-12-17 2022-02-15 广东海洋大学 一种用于无纺布制袋机的提手成型装置
CN114643747A (zh) * 2022-03-25 2022-06-21 浙江天济新材料科技有限公司 一种生物降解塑料袋生产方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108944A1 (en) 2009-03-26 2010-09-30 Roll-O-Matic A/S A process of making bags
IT1394527B1 (it) 2009-03-20 2012-07-05 Mobert Srl Macchina termosaldatrice per la produzione contemporanea di una pluralita' di rotoli di sacchetti pretagliati e con manici fustellati

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4846349A (en) * 1988-01-08 1989-07-11 Gianfranco Galimberti Method and equipment for the production and packaging operation of a continuous manufacture of small bags with longitudinal folds and transversal pre-incisions and manufacture thus packaged
US20100166340A1 (en) * 2008-12-31 2010-07-01 Ips Industries, Inc. Pack of unfolded plastic bags

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1394527B1 (it) 2009-03-20 2012-07-05 Mobert Srl Macchina termosaldatrice per la produzione contemporanea di una pluralita' di rotoli di sacchetti pretagliati e con manici fustellati
WO2010108944A1 (en) 2009-03-26 2010-09-30 Roll-O-Matic A/S A process of making bags

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114043778A (zh) * 2021-12-17 2022-02-15 广东海洋大学 一种用于无纺布制袋机的提手成型装置
CN114643747A (zh) * 2022-03-25 2022-06-21 浙江天济新材料科技有限公司 一种生物降解塑料袋生产方法
CN114643747B (zh) * 2022-03-25 2022-09-20 浙江天济新材料科技有限公司 一种生物降解塑料袋生产方法

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