EP3805124A1 - Procédé de fabrication d'un sac en papier, machine pour la réalisation de ce procédé et sac en papier obtenu par ce procédé - Google Patents

Procédé de fabrication d'un sac en papier, machine pour la réalisation de ce procédé et sac en papier obtenu par ce procédé Download PDF

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Publication number
EP3805124A1
EP3805124A1 EP20198541.3A EP20198541A EP3805124A1 EP 3805124 A1 EP3805124 A1 EP 3805124A1 EP 20198541 A EP20198541 A EP 20198541A EP 3805124 A1 EP3805124 A1 EP 3805124A1
Authority
EP
European Patent Office
Prior art keywords
strip
gluing
sheet
bag
station
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Withdrawn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
EP20198541.3A
Other languages
German (de)
English (en)
Inventor
Stefano Giacometti
Walter ZANON
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.)
JB Machines Srl
Original Assignee
JB Machines 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 JB Machines Srl filed Critical JB Machines Srl
Publication of EP3805124A1 publication Critical patent/EP3805124A1/fr
Withdrawn legal-status Critical Current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
    • B65D27/00—Envelopes or like essentially-rectangular containers for postal or other purposes having no 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
    • B31B70/148—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
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • 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
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom 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

Definitions

  • the present invention regards a process for making a bag made of paper material, a machine for making said process and a bag made of paper material attained by means of said process, according to the preamble of the respective independent claims.
  • the present bag is intended to be employed in the field of packaging, in order to package many different articles, which are advantageously intended to be packed within further packages, or shipped, such as for example articles purchased via internet.
  • the bag, object of the present invention is advantageously employable for enclosing and packing articles, such as in particular bags of parchment paper for packing shirt articles within the respective packages.
  • the machine and the process for making the bag are advantageously intended to be employed in the field of production of bags made of paper material for packaging, or for shipping and, more generally, they are inserted in the industrial field of production of packing articles and/or shipping articles.
  • the invention is therefore inserted in the context of the industrial field of production of packing material and in particular in the production of packing material for the transport and/or shipping of articles.
  • bags have existed on the market that are made of paper material, for packing articles intended to be transported, shipped and/or stored for example in a warehouse, e.g. by means of the postal service or by means of courier.
  • Bags of parchment paper are also known, intended for example for containing stamps in stamp collections, or for containing small costume jewelry items or other small objects for retail sales.
  • the bags of parchment paper have been known on the market for some time due to the fact that they are provided with low grammage (in particular usually lower than 50 g/m 2 ), which confers transparency to the paper, allowing the view of the contents thereof through the sheet-like elements that form it.
  • the bags of parchment paper of known type are normally made by hand and are provided with two sheet-like elements, of which one is front and one rear, which are placed facing each other and are joined together at three of their four perimeter margins, thus defining a containment volume of the articles to be packaged.
  • the bags of known type are provided with an access opening to the containment volume, and such opening is delimited by the two free perimeter margins of the two sheet-like elements, i.e. by the free perimeter margin of the front element and by the free perimeter margin of the rear element.
  • the two sheet-like elements are made in a single body, with a single paper element folded to form one of the four perimeter margins, while the other two perimeter margins defining containment volume are normally joined by means of gluing.
  • the bags made of paper material made of parchment paper of known type are also provided with a closure flap, which is generally made in a single body with the rear sheet-like element, projecting from its free margin, and is susceptible of being folded on the front sheet-like element to cover the access opening of the bag.
  • the closure flap can be provided with a strip of adhesive material in order to fix the closure flap itself to the front sheet-like element, in such a manner to ensure the closure of the access opening and prevent the bag's contents from exiting during transport.
  • machines are known on the market for producing bags made of paper material and in particular of parchment paper, which are intended to produce bags of limited size, i.e. on the order of several centimeters, so as to contain small objects for retail sales or for stamp collections.
  • Such machines of known type provide for an initial station for feeding a paper strip, moved by a plurality of actuation rollers extended along a substantially horizontal direction.
  • the machine drives the strip of paper material along a longitudinal work direction that is substantially horizontal.
  • the machine also comprises a folding station, in which a wedge intercepts the strip of paper material in order to form a fold that is substantially median with respect to the transverse extension of the strip and parallel to the longitudinal direction.
  • the folding station normally provides for folding the strip of paper material in a manner such that an end flap of the strip itself projects following the folding, which will form the closure flap of the bag.
  • the machine of known type also provides for a cutting station, in which the folded paper strip is transversely cut into folded portions, at regular intervals. In this manner, each folded portion defines the two aforesaid sheet-like elements facing each other and joined at a perimeter margin defined by the longitudinal bend.
  • the machine of known type also provides for a gluing station, in which two of the three free perimeter margins have glue material spread thereon in order to join together the free perimeter margins of the two sheet-like elements, making a bag.
  • the main drawback lies in the fact that the bags attainable are all small-size, since the parchment paper is extremely thin and extremely fragile.
  • the folding station provides for longitudinally folding the strip of parchment paper in order to form a tube, from which the two sheet-like elements which form the bag will be subsequently made.
  • the folding station imparts a very high force on the strip, which is broken if its transverse extension exceeds a threshold value, normally a few centimeters, and in particular when it exceeds an extension of about 10 cm.
  • a further drawback lies in the fact that the production quality of each single bag depends on the manual abilities of the operators and therefore it is impossible to ensure a quality production standard.
  • bags of parchment paper have never been used as valid substitution of bags made of other material, in particular of plastic material, since such bags of parchment paper of known type are hard to work and therefore extremely costly to be made when they exceed critical dimensions, in particular a few centimeters width.
  • bags of parchment paper are known that are made starting from two separate sheet-like elements fixed together by means of gluing three folded margins (to make the two lateral margins and the bottom margin of the bag). In particular, each margin is made by placing a glue line on an external face (directed towards the exterior of the bag) of one of the two sheet-like elements and folding the flaps of the second sheet-like element on such glue line.
  • a machine for making bags made of paper material, which comprises a coupling station for facing two strips of paper material and a gluing station which places two longitudinal gluing lines along the two longitudinal margins of the two strips, in order to fix together the two lateral margins of a bag, and a plurality of transverse gluing lines in order to fix the bottom margin of each bag.
  • the aforesaid machine of known type comprises a cutting station, adapted to cut the two strips after each transverse cutting line, in order to separate the bottom margin of each bag from the open margin of the subsequent bag.
  • the problem underlying the present invention is therefore that of overcoming the drawbacks manifested by the bags of known type, by providing a bag made of paper material for packing articles, which is made of thin paper material and is attainable of any desired size.
  • a further object of the present invention is to provide a bag made of paper material which can constitute a valid substitution of the bags made of plastic material.
  • a further object of the present invention is to provide a bag made of paper material of high structural quality, suitable for enclosing articles of any type, such as shirt articles, for the packing thereof.
  • a further object of the present invention is to provide a bag made of paper material that is structurally solid, which is quick, simple and inexpensive to make.
  • a further object of the present invention is to provide a machine for making a bag made of paper material which is capable of making bags of thin paper of any size.
  • a further object of the present invention is to provide a machine for making a bag made of paper material which does not require carrying out production steps by hand.
  • a further object of the present invention is to provide a machine for making a bag made of paper material which ensures a high quality standard for each bag made.
  • a further object of the present invention is to provide a machine for making a bag made of paper material which is simple to operate and entirely reliable.
  • a further object of the present invention is to provide a process for making a bag made of paper material which ensures high structural quality of each bag thus made.
  • a further object of the present invention is to provide a process for making a bag made of paper material which allows making bags made of very thin paper material of any desired size.
  • a further object of the present invention is to provide a process for making a bag made of paper material which is quick and simple to actuate.
  • reference number 100 overall indicates a bag made of paper material, according to the present invention.
  • the bag 100 is attained by means of a process and a machine, which are also the object of the present invention and are better described hereinbelow.
  • the bag 100 can be made from one or more layers of paper material that are joined together, and preferably the bag 100 is made of parchment paper, commonly known in the jargon of the field with the name "glassine paper”.
  • Parchment paper or glassine paper, is normally obtained by means of calendering common paper and is normally thin and at least partially transparent.
  • the bag 100 is advantageously employable for packing products of various type, for example shirt articles.
  • the bag 100 can be advantageously used for enclosing a shirt before the latter is inserted within a corresponding box in order to be stored or shipped.
  • the bag 100 object of the present invention, can be advantageously used in any field where the use of a bag of parchment paper is preferable, such as stamp collection or archiving documents.
  • the bag 100 made of paper material for packing articles, object of the present invention comprises a first sheet-like element 101 and a second sheet-like element 102, facing each other and between them delimiting a containment volume of the bag intended to contain articles to be packaged.
  • first sheet-like element 101 and the second sheet-like element 102 are provided, respectively, with a first internal face and with a second internal face facing each other and between which the aforesaid containment volume is advantageously extended.
  • the first sheet-like element 101 and the second sheet-like element 102 have substantially quadrangular shape, in particular rectangular.
  • each between the first and the second sheet-like element 101,102 is provided with at least two lateral margins 103, fixed to the corresponding at least two lateral margins 103 of the opposite sheet-like element 102, 101.
  • each lateral margin 103 of the first sheet-like element 101 is superimposed and fixed to a corresponding lateral margin 103 of the opposite second sheet-like element 102.
  • the lateral margins 103 of the first and of the second sheet-like element 101, 102 correspond to the lateral margins of the bag 100 itself.
  • the lateral margins 103 of each of the aforesaid first and second sheet-like elements 101, 102 are substantially parallel to each other and spaced from each other by a distance equal to the width of the bag 100.
  • the distance between the two lateral margins 103 of the first sheet-like element 101 which substantially coincides with the distance between the two lateral margins 103 of the second sheet-like element 102, defines the width of the bag 100.
  • the first sheet-like element 101 and the second sheet-like element 102 of the bag 100 according to the invention also comprise at least one bottom margin 104, which is extended between the two lateral margins 103 and is fixed to the corresponding bottom margin 104 of the opposite sheet-like element 102, 101.
  • the bottom margin 104 defines an end edge of the bag 100 and is placed to connect the two lateral margins 103, and advantageously it has an extension equal to the width of the bag 100.
  • the first sheet-like element 101 and the second sheet-like element 102 of the bag 100 according to the invention comprise at least one free margin 106 opposite the bottom margin 104, facing the corresponding at least one free margin 106 of the opposite sheet-like element 102, 101, with which it delimits an access opening 105 to the containment volume.
  • the distance between the bottom margin 104 and the free margin 106 defines the height of the bag 100.
  • the bag 100 also comprises a closure flap 108, which is extended projectingly from the free margin 106 of at least one between the first sheet-like element 101 and the second sheet-like element 102 and is susceptible of being folded at least in partial superimposition on the other sheet-like element 102, 101 in order to close the access opening 105 to the containment volume of the bag 100.
  • a closure flap 108 which is extended projectingly from the free margin 106 of at least one between the first sheet-like element 101 and the second sheet-like element 102 and is susceptible of being folded at least in partial superimposition on the other sheet-like element 102, 101 in order to close the access opening 105 to the containment volume of the bag 100.
  • closure flap 108 is extended beyond the free margin 106 of the opposite sheet-like element 101, 102, and is susceptible of being folded around the latter until it is at least partially superimposed on the latter to close the access opening 105 to the containment volume of the bag 100.
  • the closure flap 108 has quadrangular shape, in particular rectangular or trapezoidal shape, and is preferably extended for the entire width of the bag 100.
  • the closure flap 108 is made in a single body with the second sheet-like element 102.
  • the first sheet-like element 101 and said second sheet-like element 102 are made of paper provided with grammage comprised between 12 g/m 2 and 28 g/m 2 .
  • the lateral margins 103 of the first sheet-like element 101 are constrained to the corresponding lateral margins 103 of the second sheet-like element 102 by means of gluing and the bottom margin 104 of the first sheet-like element 101 is also constrained to the bottom margin 104 of the second sheet-like element 102 by means of gluing.
  • the bag 100 object of the present invention, comprises at least two second glue lines 110, each placed along a corresponding lateral margin 103 and interposed between the first internal face of the first sheet-like element 101 and the second internal face of said second sheet-like element 102.
  • each second glue line 110 is advantageously placed flush with the corresponding lateral margins 103 of the first and of the second sheet-like element 101, 102, without having to make latter turn-ups.
  • the bottom margin 104 of the second sheet-like element 102 comprises a folded flap 107 fixed to the bottom margin 104 of the first sheet-like element 101 at an external face thereof.
  • the folded flap 107 is preferably extended starting from a perimeter edge of the second sheet-like element 102 opposite the free margin 106.
  • Such folded flap 107 at least partially encloses the bottom margin 104 of the first sheet-like element 101 and is fixed to the latter by means of gluing, for example by means of a first glue line 109.
  • the folded flap 107 of the second sheet-like element 102 is extended substantially for the entire width of the bag 100, so as to close the bottom margins 104.
  • the folded flap 107 of the second sheet-like element 102 is extended for a height (substantially orthogonal to the width of the bag 100), different from the height of the closure flap 108.
  • the closure flap 108 is provided with a height greater than the folded flap 107 of the second sheet-like element 102, so as to be inserted within the containment volume in order to close the bag.
  • the closure flap 108 can have height equal to or smaller than the folded flap 107 and for example be provided with an adhesive strip in order to be fixed to the first sheet-like element 101.
  • the bottom margin 104 of the first sheet-like element 101 faces the bottom margin 104 of the second sheet-like element 102 and is fixed at an internal face thereof.
  • the two lateral margins 103 and the bottom margin 104 of the first sheet-like element 101 are all fixed to the corresponding two lateral margins 103 and to the corresponding bottom margin 104 of the second sheet-like element 102, defining the containment volume for packing articles.
  • the first sheet-like element 101 and the second sheet-like element 102 are made of parchment paper provided with grammage comprised between 18 g/m 2 and 24 g/m 2 .
  • Also forming the object of the present invention is a machine for making a bag for packing articles, of the type described up to now, and regarding which the same reference numbers will be maintained for the sake of description simplicity.
  • the present machine is adapted to make the above-described bag 100 by means of a process, also the object of the present invention, and described in detail hereinbelow.
  • reference number 1 overall indicates a machine for making a bag for packing articles, according to the present invention.
  • the machine 1 for making a bag 100 for packing articles, object of the present invention is extended along a main work axis X between a feeding section 2 and an unloading section 3.
  • the machine 1 comprises a coupling station 4 provided at the feeding section 2, configured for facing a first strip 5 of paper material and a second strip 6 of paper material and for moving them parallel to the main work axis X.
  • each strip 5, 6 is provided with corresponding longitudinal edges 19, 19' (including a first longitudinal edge 19 and a second longitudinal edge 19'), which delimit the width of the strip 5, 6, and it is moved to advance with such longitudinal edges 19, 19' parallel to the main work axis X.
  • the feeding section 2 advantageously comprises feeding means for a first roll 5' of first strip 5 and for a second roll 6' of second strip 6.
  • the feeding means for the first and the second roll 5', 6' comprise at least two roll holders mechanically supported by a support structure and configured for rotatably constraining the first and the second roll 5', 6' around their respective rotation axes which are parallel to each other and preferably substantially horizontal.
  • the coupling station 4 comprises at least one coupling roller 11 rotatable around a rotation axis thereof parallel to that of the roll holders and configured for approaching the second strip 6 facing the first strip 5 along the main work axis X.
  • the width transverse to the main work axis X of the second strip 6 is greater than that of the first strip 5.
  • the second strip 6 projects laterally with respect to the first strip 5 with a first flap 20 and a second flap 21 that are opposite, once coupled at the coupling station 4.
  • the first flap 20 and the second flap 21 can have any height, also different from each other, only depending on the difference of transverse width between the first strip 5 and the second strip 6.
  • the first and the second strip 5, 6 are placed facing each other, with the first strip 5 having a first internal surface thereof directed towards a second internal surface of the second strip 6.
  • the machine 1 also comprises at least one gluing station 7 operatively associated with the coupling station 4 and provided with gluing means 12 configured for intercepting and placing, on at least one between the first strip 5 and the second strip 6, gluing lines 8 that are transverse with respect to the main work axis X and at least one longitudinal gluing line 9 at the first longitudinal edge 19 of at least one between the first strip 5 and said second strip 6.
  • the gluing means 12 are configured for placing the longitudinal gluing line 9 on the first longitudinal edge 19 of the second strip 6.
  • the gluing station 7 comprises a dispensing nozzle 15 configured for injecting, in a substantially continuous manner, a dose of glue material on the second strip 6 at its first longitudinal edge 19 in order to longitudinally glue the second strip 6 to the first strip 5.
  • the gluing station 7 comprises at least one gluing roller 13 arranged for intercepting at least one between the first and the second strip 5, 6 and preferably the second strip 6, in order to place the transverse gluing lines 8 between the first internal surface of the first strip 5 and the second internal surface of the second strip 6.
  • the gluing roller 13 places the transverse gluing lines 8 on the second internal surface of the second strip 6, intended to be directed towards, and coupled with the first internal surface of the first strip 5 at the coupling station 4.
  • the coupling station 4 is arranged in order to make the first internal surface of the first strip 5 and the second internal face of the second strip 6 adhere with each other, constraining the latter by means of the aforesaid transverse gluing lines 8.
  • the gluing roller 13 places the transverse gluing lines 8 spaced from each other, along the main work axis X, by a distance equal substantially to the width of the bag 100 to be made, and more preferably places such transverse gluing lines 8 all at the same distance, i.e. with constant pitch along the main work axis X.
  • the gluing means 12 also provide for at least one tensioning roller 14 and preferably a plurality of tensioning rollers 14 placed alongside the gluing roller 13 in order to allow a correct application of the transverse glue lines 8.
  • the gluing roller 13 comprises at least one elongated pad, termed "blade” in the technical jargon of the field, externally mounted on the gluing roller 13 itself and extended transverse to the main work axis X.
  • blade elongated pad
  • the elongated pad of the gluing roller 13 is soaked with glue material and cyclically intercepts the second strip 6 in order to transfer the glue material on the second strip 6 itself, forming the aforesaid transverse gluing lines 8 that are advantageously equidistant.
  • the gluing means 12 can be configured for intercepting the first strip 5 and applying the transverse gluing lines 8 on the latter, without departing from the protective scope of the present patent.
  • the machine 1 also comprises at least one cutting station 10 operatively associated with the coupling station 4 and with the gluing station 7, configured for intercepting the first strip 5 and the second strip 6 and provided with cutting means 16 actuatable in order to cut the first strip 5 and the second strip 6.
  • the aforesaid cutting means 16 are arranged in order to cut with pitch such to make cutting lines orthogonal to the main work axis X and superimposed on the transverse gluing lines 8 to define lateral margins 103 of the bags 100 to be made.
  • the cutting means 16 are operatively synchronized with the gluing means 12 (and in particular with the gluing roller 13) in order to have substantially equal operating pitch (i.e. respectively for cutting and gluing the transverse gluing lines 8), i.e. for acting on the strips 5, 6 in the same positions along the main work axis X.
  • the cutting means 16 cut the strips 5, 6 in the same position at which the gluing means 12 deposit the transverse gluing lines 8, cutting each of the latter at the two gluing semi-lines that define the lateral margins 103 of the bags 100.
  • a bag 100 of the above-described type is formed.
  • each orthogonal cutting line made by the cutting means 16 corresponds with a lateral margin 103 of a bag 100 and with the lateral margin 103 of a subsequent bag 100 along the main work axis X.
  • the cutting means 16 are arranged for making the orthogonal cutting lines spaced from each other, along the main axis X, by a distance equal to the width of the bags 100 to be made, and preferably for making such orthogonal cutting lines all at the same distance from each other.
  • the cutting means 16 are arranged for dividing each gluing line 8 into two transverse gluing semi-lines, corresponding to the second glue lines 110 of two consecutive bags 100.
  • the cutting means 16 are arranged for dividing each gluing line 8 substantially in half, so as to obtain the two transverse gluing semi-lines substantially of the same width.
  • the cutting means 16 comprise at least one rotatable blade 22 actuatable by means of an electric servomotor (not illustrated in the enclosed figures) between a passage configuration, in which it does not interfere with the first and the second strip, and a cutting configuration, in which the blade 22 cuts the first and the second strip 5, 6 at a transverse gluing line 8 in order to separate a bag 100 thus formed.
  • an electric servomotor not illustrated in the enclosed figures
  • the cutting means 16 of the cutting station 10 comprise a shaped blade 23, in particular known in the technical jargon of the field with the name "cutter”, it too preferably rotatable, movable by means of the actuation of an electric motor (not illustrated in the enclosed figures) in order to cut the second flap 21 of the second strip 6 at each transverse gluing line 8 in order to form the trapezoid-shaped closure flaps 108 of the bags 100.
  • the machine 1, object of the present invention comprises a folding station 17 interposed between the coupling station 4 and the cutting station 10.
  • the folding station 17 preferably comprises an interception element 18 configured for interfering with the second strip 6 in order to fold the first flap 20 at its first longitudinal edge 19.
  • the interception element 18 of the folding station 17 comprises a former sliding block interposed between the coupling station 4 and the cutting station 10 and configured for intercepting with one end thereof the first longitudinal edge 19, forming in particular the aforesaid first flap 20 of the second strip 6 and folding it on the first strip 5.
  • the gluing station 7 comprises the aforesaid dispensing nozzle 15, which is mechanically associated with the interception element 18 of the folding station 17 and is configured for injecting, in a substantially continuous manner, a dose of glue material on the second strip 6 at the first flap 20 in order to longitudinally glue the second strip 6 on the first strip 5.
  • the machine 1 also preferably comprises at least one conveyor belt 24 placed at the outlet section 3 and in particular associated with the cutting station 10, which defines a driving surface 24' movable by actuation rollers in order to transport the bags 100 obtained for the storage thereof.
  • Also forming the object of the present invention is a process for making a bag 100 for packing articles, advantageously attainable by means of a machine for making a bag for packing articles of the type described up to now and regarding which the same reference numbers will be maintained hereinbelow for the sake of description simplicity.
  • the process according to the invention advantageously comprises a step of arranging a first strip 5 and a second strip 6 made of paper material.
  • the process then provides for a coupling step, in which the first strip 5 of paper material faces the second strip 6 of paper material and they are directed along a main work axis X.
  • the process also provides for at least one gluing step in which gluing means 12 intercept and place, on at least one between the first strip 5 and the second strip 6, gluing lines 8 that are transverse with respect to the main work axis X and at least one longitudinal gluing line 9 at the first longitudinal edge 19 of at least one between the first strip 5 and the second strip 6.
  • the process, object of the present invention also provides for at least one cutting step, subsequent to the gluing step, in which cutting means 16 are actuated in order to cut the first strip 5 and the second strip 6.
  • the cutting means 16 make cutting lines orthogonal to the main work axis X and superimposed on the transverse gluing lines 8, in a manner such that each cutting line defines a lateral margin 103 of a bag 100 and a lateral margin 103 of a subsequent bag 100 along the main work axis X.
  • the cutting step divides each transverse gluing line 8 into two transverse gluing semi-lines, preferably of the same width, each of which placed along the corresponding lateral margin 103 of the corresponding bag 100 and defines the corresponding second glue line 110 of such bag 100.
  • the transverse gluing lines 8, deposited in the gluing step are spaced one from the next, along the main work axis X, by a distance equal substantially to the width of the bag 100 to be made, and preferably they are all spaced from each other by the same distance.
  • the orthogonal cutting lines, made in the cutting step are spaced one from the next, along the main work axis X, by a distance equal substantially to the width of the bag 100 to be made, and preferably are all spaced from each other by the same distance.
  • the width of each bag 100 is defined by the distance between two consecutive orthogonal cutting lines along the main work axis X.
  • the first strip 5 is provided with a first internal surface and the second strip 6 is provided with a second internal surface, which, during the coupling step, are directed towards each other, so as to define the internal faces of the first and of the second sheet-like element 101, 102 of the bag 100 to be made.
  • the gluing means 12 place the transverse gluing lines 8 between the first internal surface of the first strip 5 and the second internal surface of the second strip 6.
  • the first and the second strip 5, 6 advance along the main work axis X with their longitudinal edges 19, 19' placed substantially parallel to each other and parallel to the main work axis X itself.
  • the two longitudinal edges 19, 19' of the first and of the second strip 5, 6 are intended to define the bottom margin 104 and the free margin 106 of the first and of the second sheet-like element 101, 102 of the above-described bag 100.
  • the gluing means 12 place the longitudinal gluing line 9 at the first longitudinal edge 19 of at least one between the first strip 5 and the second strip 6.
  • the second longitudinal edges 19' of the first strip 5 and of the second strip 6, opposite to the longitudinal gluing line 9 are not glued to each other and are therefore left separate from each other, so as to defined, at such second longitudinal edges 19', the free margins 106 of the bags 100.
  • the process comprises a folding step in which an interception element 18 intercepts the second strip 6 and folds a first flap 20 at its first longitudinal edge 19, placing it at least partially to cover the first strip 5 so as to allow the aforesaid gluing step.
  • the gluing step provides for inserting, in a substantially continuous manner, a dose of glue material between the first flap 20 and the first strip 5 so as to join the two bottom margins 104 of the bag 100.
  • the process provides for using the first strip 5 and the second strip 6 of parchment paper with grammage comprised between 12 g/m 2 and 28 g/m 2 .
  • first strip 5 and the second strip 6 have grammage comprised between 18 g/m 2 and 24 g/m 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
EP20198541.3A 2019-09-27 2020-09-25 Procédé de fabrication d'un sac en papier, machine pour la réalisation de ce procédé et sac en papier obtenu par ce procédé Withdrawn EP3805124A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000017399A IT201900017399A1 (it) 2019-09-27 2019-09-27 Busta in materiale cartaceo per l’imballaggio di articoli, macchina per realizzare detta busta e procedimento per realizzare detta busta

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EP3805124A1 true EP3805124A1 (fr) 2021-04-14

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EP20198541.3A Withdrawn EP3805124A1 (fr) 2019-09-27 2020-09-25 Procédé de fabrication d'un sac en papier, machine pour la réalisation de ce procédé et sac en papier obtenu par ce procédé

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EP (1) EP3805124A1 (fr)
IT (1) IT201900017399A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR758378A (fr) 1933-05-23 1934-01-15 C Et A Holweg Procédé de fabrication de sacs plats avec de la matière en bobines
US2067948A (en) 1934-10-10 1937-01-19 Potdevin Machine Co Bag
US4015771A (en) * 1975-01-14 1977-04-05 Sengewald Karl H Packaging bag of thermoplastic synthetic plastic film
GB2112732A (en) * 1978-09-01 1983-07-27 Gregg Eng Corp Method and device for making stuffed envelopes
CA2226619A1 (fr) * 1995-07-11 1997-01-30 Avery Dennison Corporation Ensemble double enveloppe n·10 imprimable par ordinateur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR758378A (fr) 1933-05-23 1934-01-15 C Et A Holweg Procédé de fabrication de sacs plats avec de la matière en bobines
US2067948A (en) 1934-10-10 1937-01-19 Potdevin Machine Co Bag
US4015771A (en) * 1975-01-14 1977-04-05 Sengewald Karl H Packaging bag of thermoplastic synthetic plastic film
GB2112732A (en) * 1978-09-01 1983-07-27 Gregg Eng Corp Method and device for making stuffed envelopes
CA2226619A1 (fr) * 1995-07-11 1997-01-30 Avery Dennison Corporation Ensemble double enveloppe n·10 imprimable par ordinateur

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