EP4039457A1 - Procédé de fabrication d'enveloppes d'expédition en matière plastique inviolable - Google Patents

Procédé de fabrication d'enveloppes d'expédition en matière plastique inviolable Download PDF

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Publication number
EP4039457A1
EP4039457A1 EP22155123.7A EP22155123A EP4039457A1 EP 4039457 A1 EP4039457 A1 EP 4039457A1 EP 22155123 A EP22155123 A EP 22155123A EP 4039457 A1 EP4039457 A1 EP 4039457A1
Authority
EP
European Patent Office
Prior art keywords
welding
tape
adhesive strip
envelope
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Withdrawn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
EP22155123.7A
Other languages
German (de)
English (en)
Inventor
Niccolò Tonarelli
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.)
Amutec Srl
Original Assignee
Amutec 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 Amutec Srl filed Critical Amutec Srl
Publication of EP4039457A1 publication Critical patent/EP4039457A1/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Withdrawn legal-status Critical Current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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/004—Closing 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
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/61—Uniting opposed surfaces or edges; Taping by applying or securing strips or tape
    • 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
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/645—Making seals 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
    • 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

Definitions

  • the present invention relates to the technical field of production process for producing shipping envelopes of thermal-welding material, such as plastic material, of the tamper-proof type.
  • the invention relates to an innovative production method which enables an application of the adhesive strip in such a way as to be free from production defects and/or risks of breakages.
  • Tamper-proof or burglarproof envelopes have been existing for a long time.
  • a tamper-proof envelope 100 of heat-weldable material such as plastic material
  • the envelope is formed by sheet material of the heat-weldable type, such as plastic material, and in particular by an upper sheet overlapping a lower sheet.
  • Figure 2 shows indeed the upper sheet 150 overlapping the lower sheet 160.
  • the two overlapped sheets have a closed bottom 101, that is a longitudinal lower edge, as well highlighted both in figure 1 and in figure 2 .
  • an upper opening 104 parallel to the lower longitudinal edge that is generally obtained by opening the upper edge and acts for introducing objects/goods into the envelope.
  • the two transversal edges (102, 103) are then comprised.
  • the product is obtained starting from one single-fold tape, that is a tape unwound from a parent reel and folded along its longitudinal center-line by overlapping one half to the other one.
  • figure 1 schematizes with hatching (St) the transversal welding strips going along the whole length of the edges 102 and 103 thereby producing closing lines.
  • the transversal lines may have a variable width depending on the type of welding bar used.
  • Figure 2 shows instead the closure 101 obtained as a consequence of the sheet folded over itself.
  • the envelope is open on the side of the upper edge 104 for enabling to insert into the envelope the objects or goods in general that it will have to contain during the use.
  • an adhesive strip (105, 105', 106) indicated as "detail A" is applied with the purpose of the tamper-proof closing.
  • the adhesive strip is an assembly of overlapped layers composed in this way:
  • the adhesive tape 105 may contain thermal-coloring additives that are activated by heat. Generally, this adhesive tape 105 is red.
  • the liner has the purpose of protecting the adhesive material 105' and only after having removed the "liner” strip, the gluing material distributed onto the tape can stick.
  • adhesive material is spread over the adhesive tape 105 in correspondence of its side (105') facing the lower sheet 160 of the envelope (see figure 2A ) to be able indeed to stick onto it and close the opening.
  • the liner, or sheet 106 protects the gluing material and only once it has been removed, the tape 105 can be pressed onto the edge of the lower sheet 160 to close the envelope.
  • this part 105' can overlap the underlying portion of sheet 160, thereby closing the envelope along its whole opening, with an actually sealed closing.
  • the envelope product can be obtained starting from the unwinding of two tapes that are overlapped or from one single-fold tape (N) that is then unwound from a parent reel (B) and folded along its longitudinal center-line in such a way as to obtain two overlapped sheets (150, 160).
  • Figure 3 refers in a non-limiting way to the single-fold tape but the present description is also valid for other cases, such as the two overlapped tapes.
  • a first phase once the two sheets are overlapped for forming the envelope (for example by folding the single-fold tape over itself or by overlapping two continuous tapes) one proceeds with the application phase of the above-introduced adhesive strip (105, 106), generally with a process in a continuous way.
  • the tape is folded and enters an application station 300 of the adhesive strip, schematically depicted in figure 3 and well known per se within the state of the technique.
  • the strip is applied in a continuous way.
  • the tape proceeds towards a welding and cutting station shown in figure 3A forming the transversal welded edges 102 and 103 of figure 1 and the cut of the tape in such a way as to form the succession of envelopes with a width (p) as per figure 3A .
  • the welding station is also well known per se and provides a welding bar 400 moving towards a matching part 401 in such a way as to carry out the welding.
  • the welding is in the form of two lines (L1, L2) positioned at a certain distance from each other and each one forming a line (St) of figure 1 .
  • the line (L1) belongs to the envelope upstream of the blade and the line (L2) belongs to the downstream envelope (envelopes that actually are not detached from each other yet).
  • a blade 500 is positioned in the middle thereby generating a cut interposed between the two welding lines (L1, L2) contextually to the welding.
  • the welding heat activates the thermal-coloring agents present in the tape 105, thereby causing an activation although no tampering has occurred.
  • the welding acting also onto the two end portions of the already applied adhesive strip may cause an unwanted activation of these thermal-coloring agents.
  • heat causes unwanted deformations onto the whole adhesive strip, particularly in correspondence of the edges onto which the heating bar pushes.
  • tears or breakages of the said strip may be caused and they may compromise the correct functioning thereof.
  • an excessive temperature of the welding bar with the purpose of compensating for the over-thickness due to the adhesive strip 105 may cause an excessive fusion of the material along the whole edge 103 and 104, thus altering the welding in the line outside the section "Z".
  • the aim of the present invention is providing a production method and corresponding production line which resolves said technical disadvantages at least partially.
  • the aim of the present invention is providing a production method of the tamper-proof envelopes, and corresponding production line, wherein the application of the adhesive closing strip is such that it does not cause any damages or defects to it.
  • This method comprises the phases of:
  • At least the welds that intercept the application area/s of the adhesive strip are carried out before the application phase of the said adhesive strip (105, 105', 106).
  • the welding is carried out only onto the tape constituting the envelope, particularly onto the two overlapped sheets.
  • the welds that must be carried out before are therefore at least those ones concerning the application area of the adhesive strip.
  • welds to be carried out before are those ones concerning the application area of the said strip, therefore one operates first the welding to form the two transversal closed sides (102, 103) of the envelope and then the adhesive strip is applied.
  • the envelope bottom will be already closed by the tape folding and therefore the only welds to be carried out are indeed the ones corresponding to the two transversal closings of the envelope, obviously keeping the upper opening.
  • the starting tape is not made by a single-fold material but by two overlapped sheets, then a third transversal welding of the bottom will be necessary and, as mentioned, it could be carried out at any moment, because it would not intercept the adhesive strip anyway.
  • this third further welding could be preferably carried out contextually to the production of the transversal welds but it could also be carried out at the end of the application of the adhesive strip, for example contextually to the envelope cut or before the cut and in exit from the application phase of the adhesive strip.
  • said welding phase can occur in a continuous way onto the tape under processing.
  • said application phase of the adhesive strip can also occur in a continuous way onto the tape under processing after the welding.
  • an adhesive strip roll is rolled down and applied onto the already welded tape.
  • the application phase of the adhesive strip occurs like in the known art, that is by using the gluing material 105' which is distributed onto an edge portion of the strip 105, with this edge portion that is attached through said glue to the envelope sheet and the remaining part of the strip 105 covered by the liner 106 (see the detail of figure 2A ).
  • a cutting phase of the tape for forming the envelope.
  • the welding operation creates on the tape under processing, with a certain pitch (p), a succession of transversal welding lines (102, 103) which form the two transversal sides of the envelope.
  • the starting tape is a single-fold tape.
  • said welding station is in a continuous way.
  • said application station of the adhesive strip is in a continuous way.
  • a cutting station downstream of said application station (300) of the adhesive strip, a cutting station (60, 60') is comprised.
  • a welding station preferably in a continuous way, positioned upstream of the application station of the adhesive strip in a production line of tamper-proof envelopes.
  • Figure 4 shows schematically a production line for a tamper-proof shipping envelope according to the invention.
  • the exemplifying case of figure 4 describes a production line, and corresponding method, according to a single tape of heat-weldable single-fold material, for example of plastic material.
  • the tape (N) can be unwound from a starting parent reel (B) and folded, as known, along a longitudinal axis thereof, preferably the center-line one, positioning one part of the tape on top of the other one.
  • This station positioned upstream of the strip application works for welding, before the strip application, all those welding areas (necessary for the envelope formation) that may concern the application area of the adhesive strip.
  • the welding station in question is just the one generating the transversal welds for forming the two closed sides of the envelope, given that the envelope bottom is already closed per se by the sheet fold and other welds are not necessary.
  • the tape finds the welding section and then, in exit from it, it finds the application section of the adhesive strip (therefore the application section 300 of the adhesive strip positioned downstream of the welding section 10).
  • the application station (or section) 300 of the adhesive strip that applies the strip onto the already welded envelope is present thereby applying the strip onto already welded areas.
  • the cut occurs after having firstly welded and then applied the adhesive strip, thereby actually carrying out the cut onto a tape which is ready and worked at this point.
  • the cut occurs in a suitable cutting section (or station) (60, 60') provided with a blade 70 which is lowered onto the tape and the tape is stopped during the blade lowering (start and stop).
  • the blade raises and lowers according to a certain cadence synchronized with the forward motion speed of the tape in such a way as to cause the tape to move forward with a certain pitch (p), to stop the tape and to cut and to start the tape again cyclically.
  • the blade cuts astride the welds (102, 103) thus determining the separation of the single envelopes (see in figure 5 the cut pitch (p) that is astride the produced welds).
  • the welding section 10 (or station) can be preferably of the continuous type and it has been well known per se within the state of the art and used for a long time for example in the production field of plastic bags.
  • the section is said continuous when the forward motion of the tape is never interrupted.
  • the welding bar (10') is present on this type of welding section and, as it is well known within the state of the art, it lowers until it intercepts the tape under processing moving forward according to the arrow direction indicated in figure 4 along the processing path.
  • the welding bar can be identical to the one already described in the known art and therefore it can generate two strips (L1, L2) spaced from each other or one single strip.
  • the welding bar trapping the two layers (or sheets) of material heats locally the material that melts, thereby mixing. During the cooling, the material acquires its solid state again thereby becoming a local union of the two layers (or sheets).
  • a support plane along which the tape moves is provided and the bar (10') lowers according to a vertical motion until intercepting the tape to generate a transversal welding line (102, 103).
  • the bar raises and lowers according to a certain cadence synchronized with the forward motion of the tape in such a way as to generate transversal welding lines according to a certain pitch (5) as per figure 5 .
  • the section 10 provides a roll passage system of the tape that can be shifted and shifts according to a motion inverse to the forward motion of the tape and with the same speed.
  • the absolute speed of the tape with respect to the welding bar, in the section comprised between the shiftable rolls is equal to zero when rolls shift in the direction opposite to the forward direction of the tape.
  • the tape keeps still enabling the lowering of the welding bar and the welding, although actually the feeding is never interrupted.
  • the tape width can be any, producing envelopes of any size and even two or more tracks can be worked starting from a single track of suitable width.

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EP22155123.7A 2021-02-05 2022-02-04 Procédé de fabrication d'enveloppes d'expédition en matière plastique inviolable Withdrawn EP4039457A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000002669A IT202100002669A1 (it) 2021-02-05 2021-02-05 Un metodo produttivo per realizzare buste di spedizione in materiale plastico antieffrazione

Publications (1)

Publication Number Publication Date
EP4039457A1 true EP4039457A1 (fr) 2022-08-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22155123.7A Withdrawn EP4039457A1 (fr) 2021-02-05 2022-02-04 Procédé de fabrication d'enveloppes d'expédition en matière plastique inviolable

Country Status (2)

Country Link
EP (1) EP4039457A1 (fr)
IT (1) IT202100002669A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3190049A (en) * 1960-04-13 1965-06-22 Meulen Leonard Van Der Method and apparatus for forming a package from sheet material
GB2278594A (en) * 1993-05-27 1994-12-07 Venus Flexible Packaging Limit Tamper evident bag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3190049A (en) * 1960-04-13 1965-06-22 Meulen Leonard Van Der Method and apparatus for forming a package from sheet material
GB2278594A (en) * 1993-05-27 1994-12-07 Venus Flexible Packaging Limit Tamper evident bag

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Publication number Publication date
IT202100002669A1 (it) 2022-08-05

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