WO2023170320A1 - Control method for a packaging machine and associated packaging machine - Google Patents

Control method for a packaging machine and associated packaging machine Download PDF

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Publication number
WO2023170320A1
WO2023170320A1 PCT/ES2022/070680 ES2022070680W WO2023170320A1 WO 2023170320 A1 WO2023170320 A1 WO 2023170320A1 ES 2022070680 W ES2022070680 W ES 2022070680W WO 2023170320 A1 WO2023170320 A1 WO 2023170320A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
base sheet
cut
actuation
area
Prior art date
Application number
PCT/ES2022/070680
Other languages
Spanish (es)
French (fr)
Inventor
Pedro Nieto Zaballos
Nicolas ARREGUI ARAMBARRI
Original Assignee
ULMA Packaging, S.Coop.
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
Priority claimed from EP22382236.2A external-priority patent/EP4242117A1/en
Application filed by ULMA Packaging, S.Coop. filed Critical ULMA Packaging, S.Coop.
Publication of WO2023170320A1 publication Critical patent/WO2023170320A1/en

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Classifications

    • 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
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/02—Feeding sheets or wrapper blanks
    • B65B41/10—Feeding sheets or wrapper blanks by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12

Definitions

  • the present invention relates to control methods for packaging machines, in particular with control methods adapted for packaging machines to generate easy-open containers, and with packaging machines adapted to generate easy-open containers.
  • a continuous base sheet is supplied on which a product to be packaged is arranged and a continuous lid sheet is provided on said base sheet and said product and which is sealed to said base sheet, leaving thus the product packaged between the two sheets. After said sealing, a cut is made to separate the container from the continuous sheets sealed together, obtaining an individual container with the packaged product.
  • Some containers are easy-open type containers, so called because they make it easy for the user to open them.
  • Some types of easy-open containers comprise a piece of lid sheet that protrudes from the base sheet, in such a way that the user pulls on said piece to open the container, causing the lid sheet to detach from the base sheet and the packaged product can be accessed.
  • a drawback in this type of easy-open containers is that an excess of lid foil is required, which can make it more expensive.
  • the base sheet has a cut or tear that implies a physical separation of a piece of the base sheet from the rest of the base sheet. As the lid sheet is sealed to the entire base sheet, including said piece, said piece also remains in the final container. The user pulls on this piece and causes the lid sheet to detach from the rest of the base sheet (the lid sheet is detached along with this piece), thus being able to access the packaged product.
  • EP0748746A1 discloses a packaging machine comprising a base sheet feeding means configured to supply a base sheet; a lid sheet feeding means configured to supply a lid sheet; a sealing station configured to receive the cover sheet and the base sheet in a direction of advance of the sheets, while in a rest position, and to seal the cover sheet to the base sheet while in a sealing position ; a cutting unit arranged downstream of the feeding means and configured to make at least one cut in the base sheet supplied by the base sheet feeding means; and transport means configured to hold at least one of said sheets downstream of the sealing station, in a horizontal holding plane, and to cause the already sealed sheets to advance with their action.
  • the object of the invention is to provide a control method for a packaging machine and an associated packaging machine, as defined in the claims.
  • a first aspect of the invention relates to a control method for a packaging machine.
  • a continuous lid sheet of plastic material and a continuous base sheet are supplied to a sealing station of the machine in a feed direction.
  • the base sheet is formed by at least a first layer of cellulosic material and a second layer of plastic material arranged on the first layer and joined to said first layer, and said base sheet comprises at least one cut, which extends, to the less partially, throughout the thickness of both layers.
  • the cover sheet is sealed to the second layer of said base sheet. Thanks to the cutting, the container finally generated is an easy-to-open container.
  • a relative displacement is forced between a first sheet region of the base sheet extending from said cut and which is to one side of said cut, and a second sheet region of the base sheet which extends from the cut and is on the other side of said cut, before sealing the cover sheet to said base sheet or once said sealing has been made.
  • the purpose of the sealing between the cover sheet and the base sheet is for the cover sheet to adhere onto the second layer of plastic material of the base sheet.
  • part of the cover sheet that coincides with said cut will be introduced into said cut, adhering to the side of said second layer of plastic material and, in some cases, even to the first layer of cellulosic material.
  • the risk of this occurring is eliminated or at least greatly reduced, since, thanks to the relative displacement between the sheet areas of the base sheet that are on both sides of the cut, it is difficult or impossible for part of the cover sheet base sheet is inserted into the cut, or at least to a lesser extent compared to not causing said displacement.
  • a second aspect of the invention relates to a packaging machine.
  • the machine comprises base sheet feeding means configured to supply a continuous base sheet; lid sheet feeding means configured to supply a continuous lid sheet; a sealing station which when in a rest position is configured to receive the cover sheet and the base sheet in a forward direction and which when in a sealing position is configured to seal the cover sheet to the base sheet ; transport means configured to hold at least one of said sheets downstream of the sealing station and to cause an advance of the already sealed sheets with its action; a control unit configured to cause intermittent actuation of the transport means and that, with each actuation of the transport means, said transport means cause an advance of the sheets of a given feed length in the feed direction; and means of action.
  • the control unit is configured to arrange a first sheet area of the sheet facing the actuation means. of base that is on one side of the cut, preferably downstream of the cut in the direction of advance, and that extends from said cut, and/or a second sheet area of the base sheet that is on the other side of said cut , preferably upstream of the cut in said direction of advance, and extending from said cut.
  • the actuation means are configured to act on at least one of said sheet areas and to force, with their actuation, a relative displacement between said first sheet area and said second sheet area of the base sheet.
  • Figure 1 schematically shows a simplified elevation view of a first embodiment of the packaging machine according to the invention, with a lid sheet and a base sheet.
  • Figure 2 is a simplified plan view of the machine of Figure 1, without the transport means.
  • Figure 3 shows an elevation section of the base sheet according to section A-A in Figure 2.
  • Figure 4 shows an elevation section of the base sheet and the cover sheet according to the section BB of Figure 2.
  • Figure 5 shows an elevation section of the base sheet and the cover sheet according to the CC section of Figure 2.
  • Figure 6 shows a simplified perspective view of actuation means of an embodiment of the machine of the invention, in which the relative displacement between two sheet areas of the base sheet is carried out once said sealing has been carried out.
  • Figure 7 shows a simplified elevation view of the actuation means of Figure 6, in a rest position.
  • Figure 8 shows a simplified elevation view of the actuation means of Figure 6, in an actuation position.
  • Figure 9 is a plan view of an individual container, with a packaged product.
  • Figure 10 schematically shows a simplified elevation view of another embodiment of the packaging machine according to the invention, with a lid sheet and a base sheet.
  • Figure 11a shows a detail of the machine of Figure 10, in which the base sheet is shown resting on a projection of the lower sealing mold of the sealing station of said machine.
  • Figure 11 b shows the detail of Figure 11a, after a separation has been forced between two sheet areas of the base sheet.
  • a first aspect of the invention relates to a control method adapted for a packaging machine 100 such as that shown by way of example in Figures 1 and 10.
  • a sealing station 104 of the machine 100 is supplied with a cover sheet 3, preferably continuous, of plastic material and a base sheet 1, preferably continuous, in a feed direction A.
  • a cover sheet 3 preferably continuous, of plastic material and a base sheet 1, preferably continuous, in a feed direction A.
  • an intermittent advance of said sheets 1 and 3 is caused during their supply, causing the displacement of a determined advance length L of said sheets 1 and 3 in each advance.
  • Sheets 1 and 3 are preferably wound on respective coils, and are thus supplied from said coils (in this case they would be continuous sheets, as opposed to portions or sheets of sheet).
  • the supplied base sheet 1 is formed by a plurality of layers of material, and, in particular, by at least a first layer 1.1 of cellulosic material and a second layer 1.2 of plastic material arranged on the first layer 1.1 and joined to said first layer 1.1, as represented in Figure 3.
  • the union between layers 1.1 and 1.2 can be made by sealing or gluing, for example.
  • the base sheet 1 further comprises at least one cut 2 in the form of a through cut (along the entire thickness of the base sheet 1), slit (extending along part of the thickness of the base sheet 1) or hole.
  • the cut 2 When the cut 2 is a slit it preferably extends along the entire thickness of the second layer 1.2 and along part of the thickness of the first layer 1.1, and when the cut 2 is a cut or a hole it extends along the entire thickness of the second layer 1.2 and along the entire thickness of the first layer 1.1. In this way, in general, said cut 2 preferably extends along the entire thickness of the second layer 1.2 and along at least part of the thickness of the first layer 1.1, preferably also the entire thickness of said first layer. 1.1.
  • the cut 2 serves so that the resulting container 300 is an easy-open container, which allows the lid sheet 3 to be easily detached and the packaged product 200 can be accessed in a simple way.
  • the cut 2 will therefore be close to one end of the resulting container 300 (or may reach the end of the container 300), and may be in a corner of the container 300 or centered for example, and does not have to have a certain shape.
  • Different types of cuts for easy-open containers are well known in the sector, such as the one described in EP0748746A1, for example, so no further details are given in this regard.
  • the method further comprises the operation of making the cut 2 in the base sheet 1, in which case said cut 2 is made before feeding said base sheet 1 to the sealing station 104.
  • Said cut 2 can be made in the machine 100 itself or the base sheet 1 can arrive at said machine 100 with said cut 2 already made.
  • the base sheet 1 and the cover sheet 3 are supplied to the sealing station 104 in such a way that said cover sheet 3 is above said base sheet 1 and facing the second layer 1.2 of the base sheet 1, and in said sealing station 104 the lid sheet 3 is sealed to said second layer 1.2 of the base sheet 1.
  • the product 200 to be packaged is arranged on the base sheet 1 before said base sheet 1 reaches the sealing station 104, in such a way that the lid sheet 3 is arranged on said product 200 and, after sealing between said sheets 1 and 3, the product 200 is packaged between said plates 1 and 3.
  • a relative displacement is forced between a first sheet area 1.3 of the base sheet 1 extending from the cut 2 and which is on one side of the cut 2, preferably downstream of the cut 2 in the feed direction A, and a second sheet area 1.4 of the base sheet 1 extending from the cut 2 and which is on the other side of the cut 2, preferably upstream of the cut 2 in said direction of advance A, before sealing the cover sheet 3 to said base sheet 1 or once said sealing has been made.
  • the first sheet area 1.3 is on one side of the cut 2
  • the second sheet area 1.4 is on the opposite side of the cut 2.
  • the first side L1 is on one of the sheet areas 1.3 and 1.4, depending on where the cut 2 is made, and the second side L2 is in the other sheet area 1 .3 or 1 .4.
  • the relative displacement between the sheet areas 1.3 and 1.4 causes the cut 2 to elongate until it extends along the entire thickness of said sheet. base sheet 1.
  • said displacement causes a stretching of at least the part of the cover sheet 3 that is on the cut 2 of the base sheet 1, ensuring at least to a large extent that part of said cover sheet 3 is not inserted in said cut 2 as shown in Figure 5, which allows the resulting final container 300 to be subsequently opened without the problems described.
  • the stretching is preferably performed outside of sealing station 104 (downstream of sealing station 104).
  • said relative displacement causes a stretching of said cover sheet 3, at least in the part of said cover sheet 3 that is between the two sheet areas 1.3 and 1.4 (which is the part of said cover sheet 3 that is on the cut 2 of the base sheet 1).
  • the displacement of a sheet area 1 .3 or 1 .4 can be carried out in the following way: a push is exerted on the cover sheet 3 that is on the cut 2 or on at least one of the sheet areas 1.3 and 1.4, in a downward direction; and/or is pushed onto the cut 2 (or below the cut 2) or onto at least one of the sheet areas 1.3 and .14 of the base sheet 1, in an upward direction.
  • At least the following options exert thrust pressure in an upward or downward direction on cut 2; exerting a thrust pressure in an upward or downward direction on only the first sheet area 1.3, causing said first sheet area 1.3 to move in said upward or downward direction with respect to the second sheet area 1.4; exerting a thrust pressure in an upward or downward direction on only the second sheet area 1.4, causing said second sheet area 1.4 to move in said upward or downward direction with respect to the first sheet area 1.3; exert a thrust pressure in the same upward or downward direction in both areas of the sheet 1.3 and 1.4, causing the displacement of said sheet area 1.3 and 1.4 in said direction; and exerting a pushing pressure in an upward or downward direction on the first sheet area 1.3 and exerting a pushing pressure in an opposite direction on the second sheet area 1.4.
  • the other of the sheet areas 1.3 and 1.4 is held in position by pressing it against a surface or holding it with a tool as a clamp, for example.
  • the ascending and descending directions are preferably vertical and opposite.
  • the relative displacement can be forced in the sealing station 104 or upstream of the sealing station 104. In both cases, after said forcing the first side L1 of the base sheet 1 with respect to the cut 2 is raised with respect to the second side L2 of said base sheet 1 with respect to said cut 2.
  • the Forced action can be carried out, for example, by means of a displacement actuator that acts on the base sheet 1 by pushing it to cause displacement or by means analogous to actuation means 105 described later in relation to the machine 100.
  • the sealing station 104 comprises an upper sealing mold 104.2 and a lower sealing mold 104.1 facing each other that cooperate with each other to perform the sealing between the lid sheet 3 and the base sheet 1 arranged between said sealing molds 104.1 and 104.2.
  • the lower sealing mold 104.1 comprises an upper surface 104.11 facing the upper sealing mold 104.2, and at least in the embodiments in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the lid sheet 3 to said base sheet 1 and at the sealing station 104, said lower sealing mold 104.1 may comprise a projection 104.10 projecting from said lower sealing mold 104.1 towards the upper sealing mold 104.2 as shown. represented in figures 11a and 11 b.
  • the projection 104.10 may be an additional element or may be integrated into the upper surface 104.11.
  • the base sheet 1 is arranged in the sealing station 104 in such a way that the first side L1 of said base sheet 1 that is on one side of a cut 2 rests on said projection 104.10 (see Figure 11a ), and with said first side L1 thus supported (and with the base sheet 1 preferably stopped, without advancing in the direction of advance A), the displacement of the second side L2 of said base sheet 1, which is on the other side, is caused. side of said cut 2, towards the upper surface 104.11 of said lower sealing mold 104.1. Since said first side L1 is supported on the projection 104.10, said displacement forces a relative displacement between the sheet areas 1.3 and 1.4 associated with said cut 2, as reflected in Figure 11b.
  • a suction S is applied on said second side L2 of the base sheet 1, through at least one hole 104.12 of the lower sealing mold. 104.1.
  • This The way of moving said second side L2 has an additional advantage, for cases in which the control method is used in second skin packaging.
  • a product 200 is packaged between the base sheet 1 and the cover sheet 3 under vacuum, and said cover sheet 3 covers the product 200 following its contour. Thanks to this suction S and the space existing through the cut 2, said suction S also sucks any gas (normally air) present in the space delimited between both sheets 1 and 3 around the product 200, achieving a container 300 with better finishes.
  • the product 200 is arranged on the base sheet 1 upstream of the sealing station 104, such that in said sealing station 104 the lid sheet 3 is arranged on said product 200.
  • the projection 104.10 is at least partially hollow and includes a hole communicated with the outside (not shown in the figures), said hole being, preferably, in a side wall of said projection 104.10 (the wall that faces the cut 2 and, therefore, therefore, to the separation between the sides L1 and L2 of the base sheet 1), also causing suction through said hole.
  • the sealing station 104 may also comprise the projection 104.10 described, to further ensure that the elevation of the first side L1 with respect to the second side L2 of the base sheet 1 is maintained. If a projection 104.10 is not available, it is I would avoid applying suction on the first side L1, so that this elevation would not be eliminated.
  • the relative displacement between the first sheet area 1.3 and the second sheet area 1.4 of the base sheet 1 is carried out with the cover sheet 3 and the base sheet 1 stopped, i.e. , when the cover sheet 3 and the base sheet 1 do not move in the feed direction A.
  • a second aspect of the invention relates to a packaging machine 100, such as a thermo-forming packaging machine.
  • the machine 100 is adapted to be able to implement the control method proposed in the first aspect of the invention, so it can comprise any configuration and/or embodiment necessary to be able to implement the different configurations and/or embodiments of said method.
  • the machine 100 is further configured to generate easy-open containers.
  • the machine 100 is configured to package products 200 in individual packages 300 generated from the base sheet 1 and the lid sheet 3, and, preferably, said packaging is a second skin packaging.
  • the machine 100 comprises a base sheet feeding means 101 configured to supply a base sheet 1 (preferably continuous); lid sheet feeding means 103 configured to supply a lid sheet 3 (preferably continuous); a sealing station 104 configured to receive the cover sheet 3 and the base sheet 1 in a forward direction A of the sheets 1 and 3 while in a rest position, and to seal the cover sheet 3 to the base sheet base 1 being in a sealing position; and may comprise a cutting station 107 downstream of the sealing station 104 and configured to cut the sheets 1 and 3 and obtain individual containers 300 as a result.
  • the base sheet 1 and the cover sheet 3 travel a respective determined path in the machine 100, said path being the same once they have been sealed.
  • the sealing station 104 comprises an upper sealing mold 104.2 and a lower sealing mold 104.1 facing each other that cooperate with each other to perform the sealing between the part of the lid sheet 3 and the part of the base sheet 1 arranged between said molds. sealing mold 104.1 and 104.2, the lower sealing mold 104.1 comprising an upper surface 104.11 facing the upper sealing mold 104.2.
  • the machine 100 may further comprise a cutting unit 102 arranged between the base sheet feeding means 101 and the sealing station 104, configured to make at least one cut 2 in the base sheet 1 supplied by the base sheet feeding means. base sheet 101. Cut 2 may be as previously described for the first aspect of the invention.
  • the machine 100 also comprises transport means 108 configured to hold at least one of said sheets 1 and 3, in a horizontal driving plane P, and to cause an advance of the already sealed sheets 1 and 3 with its action, and a control unit 106 configured to act on the transport means 108 and cause the intermittent actuation of the transport means 108, causing with each actuation said sheets 1 and 3 to advance a certain advance length L.
  • the transport means 108 may be conventional and may comprise, for example, a chain on each side of the sheets 1 and 3, actuators above and below the sheets 1 and 3 to capture and drag said sheets 1 and 3, or a combination of both.
  • the machine 100 also comprises actuation means 105.
  • the control unit 106 is configured to arrange facing the actuation means 105 a first sheet area 1.3 of the base sheet 1 that extends from said cut 2 and is on one side of the cut 2, preferably downstream of the cut. 2 in the direction of advance A, and/or a second sheet area 1.4 of the base sheet 1 that extends from said cut 2 and which is on the other side of the cut 2, preferably upstream of the cut 2 in said direction of advance advance A, when a base sheet 1 is supplied with at least one cut 2.
  • Said actuation means 105 are configured to act on at least one of said sheet areas 1.3 and 1.4 and to force, with said actuation, a relative displacement between said first sheet area 1.3 and said second sheet area 1.4 of the base sheet 1.
  • the actuation means 105 are arranged in such a way that, with their actuation, they cause the upward or downward displacement of at least one of the sheet areas 1.3 and 1.4 of the base sheet 1 to force the relative displacement between said sheet areas. 1.3 and 1.4, when said actuation means 105 are actuated while facing at least one of said sheet areas 1.3 and 1.4 of a base sheet 1.
  • the actuation means 105 are arranged downstream of the sealing station 104, in such a way that they are configured to cause a stretch of at least the part of the cover sheet 3 that is on the cut 2 of said base sheet 1, causing the upward or downward displacement of at least one of the sheet areas 1.3 and 1.4 of the base sheet 1.
  • the actuation means 105 comprise at least a first actuation tool 105.1 that moves between a position of rest and an action position.
  • the actuation means 105 are also upstream of the cutting station 107.
  • the first actuation tool 105.1 In the rest position, the first actuation tool 105.1 is arranged above or below the driving plane P, and in the actuation position, said first Actuation tool 105.1 exceeds the driving plane P acting on an area of action of the path of sheets 1 and 3. In this way, when there are sheets 1 and 3 in the machine 100, the first actuation tool 105.1 acts on the sheets 1 and 3 sealed together.
  • said first actuation tool 105.1 is arranged in a position dependent on the arrangement of the cutting unit 102 and the advance length L determined in the path of the base sheet 1, in such a way that when actuated, the first actuating tool 105.1 causes the stretching of the cover sheet 3 arranged on the cut 2 of the base sheet 1 by acting on said sheets 1 and 3.
  • the first actuation tool 105.1 is arranged in such a way that when it moves to the actuation position, said first actuation tool 105.1 acts in the actuation zone whose center is at a distance with respect to the cutting unit 102 equal to a multiple integer of the advance length L determined in the path of the base sheet 1, said action zone comprising a length equal to or less than 20% of said advance length L determined in said path.
  • a relative displacement is ensured between the sheet areas 1.3 and 1.4 of the base sheet 1 that are on the sides of the cut 2, causing the stretching of the cover sheet 3 at least in the part that It is on said cut 2.
  • actuation means 105 of the machine 100 are arranged downstream of the sealing station 104, said actuation means 105 comprise only one actuation tool 105.1. In other embodiments in which said actuation means 105 are arranged downstream of the sealing station 104, the actuation means 105 of the machine 100 comprise, in addition to the first actuation tool 105.1, a second actuation tool 105.2 arranged downstream or downstream.
  • said second actuation tool 105.2 like the first actuation tool 105.1, moving it between a rest position in which it is arranged above or below the plane of drag P and an actuation position, in which it acts in the actuation zone, and to do so, it preferably exceeds the drag plane P.
  • said actuation tools 105.1 and 105.2 are arranged so that each of them acts in the actuation zone, on a respective side with respect to the cut 2 (a actuation tool 105.1 or 105.2 on the first side L1 and the other actuation tool 105.1 or 105.2 on the second side L2).
  • both actuation tools 105.1 and 105.2 are actuated by the same actuator of the actuation means 105.
  • the actuation means 105 comprising two actuation tools 105.1 and 105.2 may comprise different configurations.
  • the actuation means 105 comprising two actuation tools 105.1 and 105.2 may comprise different configurations.
  • the actuation means 105 comprising two actuation tools 105.1 and 105.2 may comprise different configurations.
  • actuation tools 105.1 and 105.2 may comprise different configurations. For example:
  • the first actuation tool 105.1 is configured to be arranged above the drive plane P and the second actuation tool 105.2 is configured to be arranged below said drive plane P, when they are in the position of rest, and are configured to move in opposite directions to move to the respective actuation position.
  • the first actuating tool 105.1 moves in a downward direction and the second tool moves in an upward direction.
  • both the first actuation tool 105.1 and the second actuation tool 105.2 are configured to be arranged above the driving plane P, when they are in the position of repose.
  • the first actuation tool 105.1 is configured to advance a greater length than the second actuation tool 105.2 when they move to the respective actuation position (see Figure 8), in such a way that the second actuation tool 105.1 presses the sheets 1 and 3 against a support surface 105.30 to keep them subject while the first actuation tool 105.1 pushes said sheets 1 and 3 to obtain the stretching of the cover sheet 3.
  • the actuation means 105 may comprise a support 105.3 that comprises the support surface 105.30, and said support 105.3 may further comprise a slot 105.31 to allow the actuation of the first actuation tool 105.1.
  • the actuation means 105 are arranged in, or associated with, the sealing station 104, and comprise a projection 104.10 that protrudes from the upper surface 104.11 of the lower sealing mold 104.1 towards the upper mold of sealing. sealing 104.2, as shown in Figure 11a, and an actuation device 104.13.
  • the projection 104.10 may be an additional element or may be integrated into the upper surface 104.11.
  • the projection 104.10 is configured to support the base sheet 1, and the actuation device 104.13 is configured to apply a suction S on said upper surface 104.11 through the lower sealing mold 104.1 (through at least one hole 104.12 of said lower sealing mold 104.1), at least in an area of said upper surface 104.11 close to the projection 104.10.
  • the control unit 106 is configured to arrange a sheet area 1.3 or 1.4 of said base sheet 1 on the projection 104.10 (the first side L1) and the other sheet area 1.3 or 1.4 (the second side L2) on the area of the upper surface 104.11 of the lower sealing mold 104.1 which is adjacent to the projection 104.10, when a base sheet 1 with a cut 2 is supplied to the sealing station 104.
  • Actuation 105 causes the actuation device 104.13 to apply a suction S in said area, attracting the second side L2 of the base sheet 1 towards the upper surface 104.11 of the lower sealing mold 104.1, displacing it with respect to the first side L1 that remains. supported on the projection 104.10, forcing the relative displacement between the sheet areas 1.3 and 1.4 (resulting effect shown in Figure 11b, where the cover sheet 3 is also shown sealed to the base sheet 1).
  • the projection 104.10 is at least partially hollow and comprises a hole communicated with the outside (not shown in the figures), said hole being, preferably, in a side wall of said projection 104.10 (the wall that is facing the cut 2 and, therefore, the separation between the sides L1 and L2 of the base sheet 1), also causing suction through said hole.
  • the projection 104.10 is arranged in the path of the lid sheet 1 in a position dependent on the position of the cutting unit 102 and the determined feed length L.
  • the projection 104.10 is arranged in such a way that when the control unit 106 causes the advance of the sheets 1 and 3 said determined length L, a sheet area 1.3 or 1.4 of said base sheet 1 is arranged on the projection 104.10 ( supported on said projection 104.10), said sheet area 1.3 or 1.4 comprising the first side L1 of the base sheet 1 described previously.
  • the control unit 106 is configured to cause the synchronized and/or coordinated movement of the actuation means 105, the sealing station 104, the cutting unit 102, the cutting station 107 and the transport means 108.

Abstract

The invention relates to a method and to an associated packaging machine. A cover film (3) made of a plastic material and a base film (1), which is formed by at least a first layer (1.1) of cellulosic material and a second layer (1.2) made of a plastic material arranged on the first layer (1.1) and attached to said first layer (1.1) and comprising at least one cut (2), are supplied to sealing station of the machine, in a forward movement direction. In the method, a relative movement is forced between a first film area (1.3) of the base film (1) which is downstream of the cut (2) and extends from said cut (2) and a second film area (1.4) of the base film (1) which is upstream of the cut (2) and extends from said cut (2).

Description

DESCRIPCIÓN DESCRIPTION
Método de control para una máquina de envasado y máquina de envasado asociada Control method for a packaging machine and associated packaging machine
SECTOR DE LA TÉCNICA TECHNIQUE SECTOR
La presente invención se relaciona con métodos de control para máquinas de envasado, en particular con métodos de control adaptados para máquinas de envasado para generar envases abrefácil, y con máquinas de envasado adaptadas para generar envases abrefácil. The present invention relates to control methods for packaging machines, in particular with control methods adapted for packaging machines to generate easy-open containers, and with packaging machines adapted to generate easy-open containers.
ESTADO ANTERIOR DE LA TÉCNICA PRIOR STATE OF THE ART
En las máquinas para envasar productos se suministra una lámina de base continua sobre la que se dispone un producto a envasar y una lámina de tapa continua que se dispone sobre dicha lámina de base y dicho producto y que se sella a dicha lámina de base, quedando así el producto envasado entre las dos láminas. Posteriormente a dicho sellado se realiza un corte para separar el envase de las láminas continuas selladas entre sí, obteniéndose un envase individual con el producto envasado. In machines for packaging products, a continuous base sheet is supplied on which a product to be packaged is arranged and a continuous lid sheet is provided on said base sheet and said product and which is sealed to said base sheet, leaving thus the product packaged between the two sheets. After said sealing, a cut is made to separate the container from the continuous sheets sealed together, obtaining an individual container with the packaged product.
Algunos envases son envases del tipo abrefácil, denominados así porque facilitan su apertura al usuario. Algunos tipos de envases abrefácil comprenden un trozo de lámina de tapa que sobresale de la lámina de base, de tal manera que el usuario tira de dicho trozo para abrir el envase, provocando que la lámina de tapa se desprenda de la lámina de base y que se pueda acceder al producto envasado. Un inconveniente en este tipo de envases abrefácil es que se requiere un exceso de lámina de tapa, lo que puede encarecer el mismo. Some containers are easy-open type containers, so called because they make it easy for the user to open them. Some types of easy-open containers comprise a piece of lid sheet that protrudes from the base sheet, in such a way that the user pulls on said piece to open the container, causing the lid sheet to detach from the base sheet and the packaged product can be accessed. A drawback in this type of easy-open containers is that an excess of lid foil is required, which can make it more expensive.
Por ello, se conocen también otro tipo de envases abrefácil que carecen de un sobrante de lámina de tapa. En estos casos la lámina de base tiene un corte o rotura que implica una separación física de un trozo de la lámina de base del resto de la lámina de base. Como la lámina de tapa está sellada a toda la lámina de base, incluyendo dicho trozo, dicho trozo permanece también en el envase final. El usuario tira de ese trozo y provoca el desprendimiento de la lámina de tapa del resto de la lámina de base (la lámina de tapa se desprende junto con este trozo), pudiendo así acceder al producto envasado. EP0748746A1 divulga una máquina de envasado que comprende unos medios de alimentación de lámina de base configurados para suministrar una lámina de base; unos medios de alimentación de lámina de tapa configurados para suministrar una lámina de tapa; una estación de sellado configurada para recibir la lámina de tapa y la lámina de base en una dirección de avance de las láminas, estando en una posición de reposo, y para sellar la lámina de tapa a la lámina de base estando en una posición de sellado; una unidad de corte dispuesta aguas abajo de los medios de alimentación y configurada para realizar al menos un corte en la lámina de base suministrada por los medios de alimentación de lámina de base; y unos medios de transporte configurados para sujetar al menos una de dichas láminas aguas abajo de la estación de sellado, en un plano de sujeción horizontal, y para provocar un avance de las láminas ya selladas con su actuación. For this reason, other types of easy-open containers are also known that lack excess lid foil. In these cases, the base sheet has a cut or tear that implies a physical separation of a piece of the base sheet from the rest of the base sheet. As the lid sheet is sealed to the entire base sheet, including said piece, said piece also remains in the final container. The user pulls on this piece and causes the lid sheet to detach from the rest of the base sheet (the lid sheet is detached along with this piece), thus being able to access the packaged product. EP0748746A1 discloses a packaging machine comprising a base sheet feeding means configured to supply a base sheet; a lid sheet feeding means configured to supply a lid sheet; a sealing station configured to receive the cover sheet and the base sheet in a direction of advance of the sheets, while in a rest position, and to seal the cover sheet to the base sheet while in a sealing position ; a cutting unit arranged downstream of the feeding means and configured to make at least one cut in the base sheet supplied by the base sheet feeding means; and transport means configured to hold at least one of said sheets downstream of the sealing station, in a horizontal holding plane, and to cause the already sealed sheets to advance with their action.
EXPOSICIÓN DE LA INVENCIÓN STATEMENT OF THE INVENTION
El objeto de la invención es el de proporcionar un método de control para una máquina de envasado y una máquina de envasado asociada, según se define en las reivindicaciones. The object of the invention is to provide a control method for a packaging machine and an associated packaging machine, as defined in the claims.
Un primer aspecto de la invención se refiere a un método de control para una máquina de envasado. En el método, a una estación de sellado de la máquina se le suministra una lámina de tapa continua de material plástico y una lámina de base continua en una dirección de avance. La lámina de base está formada por al menos una primera capa de material celulósico y una segunda capa de material plástico dispuesta sobre la primera capa y unida a dicha primera capa, y dicha lámina de base comprende al menos un corte, que se extiende, al menos parcialmente, a lo largo del espesor de ambas capas. En la estación de sellado se sella la lámina de tapa a la segunda capa de dicha lámina de base. Gracias al corte, el envase generado finalmente es un envase abrefácil. A first aspect of the invention relates to a control method for a packaging machine. In the method, a continuous lid sheet of plastic material and a continuous base sheet are supplied to a sealing station of the machine in a feed direction. The base sheet is formed by at least a first layer of cellulosic material and a second layer of plastic material arranged on the first layer and joined to said first layer, and said base sheet comprises at least one cut, which extends, to the less partially, throughout the thickness of both layers. At the sealing station the cover sheet is sealed to the second layer of said base sheet. Thanks to the cutting, the container finally generated is an easy-to-open container.
En el método, además, se fuerza un desplazamiento relativo entre una primera zona de lámina de la lámina de base que se extiende desde dicho corte y que está a un lado de dicho corte, y una segunda zona de lámina de la lámina de base que se extiende desde el corte y que está al otro lado de dicho corte, antes de sellar la lámina de tapa a dicha lámina de base o una vez realizado dicho sellado. El propósito del sellado entre la lámina de tapa y la lámina de base es que la lámina de tapa se adhiera sobre la segunda capa de material plástico de la lámina de base. Sin embargo, debido a la presencia del corte en la lámina de base se corre el riesgo de que parte de la lámina de tapa que coincide sobre dicho corte se introduzca en dicho corte, adhiriéndose al lateral de dicha segunda capa de material plástico y, en algunos casos, incluso a la primera capa de material celulósico. Esto puede provocar que, al abrir el envase final, la segunda capa de la lámina de base se despegue de la primera capa junto con la lámina de tapa, quedando el producto dispuesto entre dicha segunda capa y dicha lámina de tapa, de forma que un usuario no pueda acceder por lo tanto al producto envasado de una manera sencilla y directa. Esto ocurre especialmente en los casos en los que se emplea una lámina de base con al menos una capa de material celulósico, como el cartón por ejemplo, y con una capa de material plástico unida a dicha capa de material celulósico, como es el caso, donde, algunas veces, se tiene el problema de que, al tirar del trozo de lámina de base que está separado o cuasi-separado del resto de la lámina de base gracias al corte, la lámina de tapa no se desprende de dicha capa de material plástico sino que es dicha capa la que se desprende de la capa de material celulósico, quedando así el producto inaccesible para el usuario entre la lámina de tapa y la segunda capa de la lámina de base. In the method, furthermore, a relative displacement is forced between a first sheet region of the base sheet extending from said cut and which is to one side of said cut, and a second sheet region of the base sheet which extends from the cut and is on the other side of said cut, before sealing the cover sheet to said base sheet or once said sealing has been made. The purpose of the sealing between the cover sheet and the base sheet is for the cover sheet to adhere onto the second layer of plastic material of the base sheet. However, due to the presence of the cut in the base sheet, there is a risk that part of the cover sheet that coincides with said cut will be introduced into said cut, adhering to the side of said second layer of plastic material and, in some cases, even to the first layer of cellulosic material. This can cause that, when opening the final container, the second layer of the base sheet detaches from the first layer together with the cover sheet, leaving the product arranged between said second layer and said cover sheet, so that a The user cannot therefore access the packaged product in a simple and direct way. This occurs especially in cases in which a base sheet is used with at least one layer of cellulosic material, such as cardboard for example, and with a layer of plastic material attached to said layer of cellulosic material, as is the case, where, sometimes, there is a problem that, when pulling the piece of base sheet that is separated or quasi-separated from the rest of the base sheet thanks to the cut, the cover sheet does not come off said layer of material plastic but rather it is said layer that is detached from the layer of cellulosic material, thus leaving the product inaccessible to the user between the cover sheet and the second layer of the base sheet.
Con el método propuesto se elimina o al menos se disminuye en gran medida el riesgo de que esto ocurra, puesto que, gracias al desplazamiento relativo entre las zonas de lámina de la lámina de base que están ambos lados del corte, se dificulta o imposibilita que parte de la lámina de tapa lámina de base quede introducida en el corte, o al menos lo esté en menor medida en comparación con no provocar dicho desplazamiento. With the proposed method, the risk of this occurring is eliminated or at least greatly reduced, since, thanks to the relative displacement between the sheet areas of the base sheet that are on both sides of the cut, it is difficult or impossible for part of the cover sheet base sheet is inserted into the cut, or at least to a lesser extent compared to not causing said displacement.
Un segundo aspecto de la invención se refiere a una máquina de envasado. La máquina comprende unos medios de alimentación de lámina de base configurados para suministrar una lámina de base continua; unos medios de alimentación de lámina de tapa configurados para suministrar una lámina de tapa continua; una estación de sellado que estando en una posición de reposo está configurada para recibir la lámina de tapa y la lámina de base en una dirección de avance y que estando en una posición de sellado está configurada para sella la lámina de tapa a la lámina de base; unos medios de transporte configurados para sujetar al menos una de dichas láminas aguas abajo de la estación de sellado y para provocar un avance de las láminas ya selladas con su actuación; una unidad de control configurada para provocar una actuación intermitente de los medios de transporte y que, con cada actuación de los medios de transporte, dichos medios de transporte provoquen un avance de las láminas de una longitud de avance determinada en la dirección de avance; y unos medios de actuación. A second aspect of the invention relates to a packaging machine. The machine comprises base sheet feeding means configured to supply a continuous base sheet; lid sheet feeding means configured to supply a continuous lid sheet; a sealing station which when in a rest position is configured to receive the cover sheet and the base sheet in a forward direction and which when in a sealing position is configured to seal the cover sheet to the base sheet ; transport means configured to hold at least one of said sheets downstream of the sealing station and to cause an advance of the already sealed sheets with its action; a control unit configured to cause intermittent actuation of the transport means and that, with each actuation of the transport means, said transport means cause an advance of the sheets of a given feed length in the feed direction; and means of action.
Cuando la lámina de base comprende al menos un corte que se extiende a lo largo de al menos parte del espesor de dicha lámina de base, la unidad de control está configurada para disponer enfrentada a los medios de actuación una primera zona de lámina de la lámina de base que está a un lado del corte, preferentemente aguas abajo del corte en la dirección de avance, y que se extiende desde dicho corte, y/o una segunda zona de lámina de la lámina de base que está al otro lado de dicho corte, preferentemente aguas arriba del corte en dicha dirección de avance, y que se extiende desde dicho corte. Los medios de actuación están configurados para actuar sobre la menos una de dichas zonas de lámina y para forzar, con su actuación, un desplazamiento relativo entre dicha primera zona de lámina y dicha segunda zona de lámina de la lámina de base. When the base sheet comprises at least one cut that extends along at least part of the thickness of said base sheet, the control unit is configured to arrange a first sheet area of the sheet facing the actuation means. of base that is on one side of the cut, preferably downstream of the cut in the direction of advance, and that extends from said cut, and/or a second sheet area of the base sheet that is on the other side of said cut , preferably upstream of the cut in said direction of advance, and extending from said cut. The actuation means are configured to act on at least one of said sheet areas and to force, with their actuation, a relative displacement between said first sheet area and said second sheet area of the base sheet.
Con la máquina se obtienen también las ventajas descritas para el método. The advantages described for the method are also obtained with the machine.
Estas y otras ventajas y características de la invención se harán evidentes a la vista de las figuras y de la descripción detallada de la invención. These and other advantages and characteristics of the invention will become evident in view of the figures and the detailed description of the invention.
DESCRIPCIÓN DE LOS DIBUJOS DESCRIPTION OF THE DRAWINGS
La figura 1 muestra esquemáticamente una vista simplificada en alzado de una primera realización de la máquina de envasado según la invención, con una lámina de tapa y una lámina de base. Figure 1 schematically shows a simplified elevation view of a first embodiment of the packaging machine according to the invention, with a lid sheet and a base sheet.
La figura 2 es una vista simplificada en planta de la máquina de la figura 1 , sin los medios de transporte. Figure 2 is a simplified plan view of the machine of Figure 1, without the transport means.
La figura 3 muestra una sección en alzado de la lámina de base según el corte A-A de la figura 2. Figure 3 shows an elevation section of the base sheet according to section A-A in Figure 2.
La figura 4 muestra una sección en alzado de la lámina de base y la lámina de tapa según el corte B-B de la figura 2. La figura 5 muestra una sección en alzado de la lámina de base y la lámina de tapa según el corte C-C de la figura 2. Figure 4 shows an elevation section of the base sheet and the cover sheet according to the section BB of Figure 2. Figure 5 shows an elevation section of the base sheet and the cover sheet according to the CC section of Figure 2.
La figura 6 muestra una vista simplificada en perspectiva de unos medios de actuación de una realización de la máquina de la invención, en la que el desplazamiento relativo entre dos zonas de lámina de la lámina de base se realiza una vez realizado dicho sellado. Figure 6 shows a simplified perspective view of actuation means of an embodiment of the machine of the invention, in which the relative displacement between two sheet areas of the base sheet is carried out once said sealing has been carried out.
La figura 7 muestra una vista simplificada en alzado de los medios de actuación de la figura 6, en una posición de reposo. Figure 7 shows a simplified elevation view of the actuation means of Figure 6, in a rest position.
La figura 8 muestra una vista simplificada en alzado de los medios de actuación de la figura 6, en una posición de actuación. Figure 8 shows a simplified elevation view of the actuation means of Figure 6, in an actuation position.
La figura 9 es una vista en planta de un envase individual, con un producto envasado. Figure 9 is a plan view of an individual container, with a packaged product.
La figura 10 muestra esquemáticamente una vista simplificada en alzado de otra realización de la máquina de envasado según la invención, con una lámina de tapa y una lámina de base. Figure 10 schematically shows a simplified elevation view of another embodiment of the packaging machine according to the invention, with a lid sheet and a base sheet.
La figura 11a muestra un detalle de la máquina de la figura 10, en el que se muestra la lámina de base apoyada sobre un saliente del molde inferior de sellado de la estación de sellado de dicha máquina. Figure 11a shows a detail of the machine of Figure 10, in which the base sheet is shown resting on a projection of the lower sealing mold of the sealing station of said machine.
La figura 11 b muestra el detalle de la figura 11a, tras haberse forzado una separación entre dos zonas de lámina de la lámina de base. Figure 11 b shows the detail of Figure 11a, after a separation has been forced between two sheet areas of the base sheet.
EXPOSICIÓN DETALLADA DE LA INVENCIÓN DETAILED STATEMENT OF THE INVENTION
Un primer aspecto de la invención se refiere a un método de control adaptado para una máquina 100 de envasado como la representada a modo de ejemplo en las figuras 1 y 10. A first aspect of the invention relates to a control method adapted for a packaging machine 100 such as that shown by way of example in Figures 1 and 10.
En el método, a una estación de sellado 104 de la máquina 100 se le suministra una lámina de tapa 3, preferentemente continua, de material plástico y una lámina de base 1 , preferentemente continua, en una dirección de avance A. Preferentemente, en el método se provoca un avance intermitente de dichas láminas 1 y 3 durante su suministro, provocándose el desplazamiento de una longitud de avance L determinada de dichas láminas 1 y 3 en cada avance. In the method, a sealing station 104 of the machine 100 is supplied with a cover sheet 3, preferably continuous, of plastic material and a base sheet 1, preferably continuous, in a feed direction A. Preferably, in the method, an intermittent advance of said sheets 1 and 3 is caused during their supply, causing the displacement of a determined advance length L of said sheets 1 and 3 in each advance.
Las láminas 1 y 3 están preferentemente arrolladas en bobinas respectivas, y se suministran así desde dichas bobinas (en este caso serían láminas continuas, en contraposición a porciones o placas de lámina). La lámina de base 1 que se suministra está formada por una pluralidad de capas de material, y, en particular, por al menos una primera capa 1.1 de material celulósico y una segunda capa 1.2 de material plástico dispuesta sobre la primera capa 1.1 y unida a dicha primera capa 1.1 , tal y como se representa en la figura 3. La unión entre las capas 1.1 y 1.2 puede estar realizada mediante sellado o pegado, por ejemplo. La lámina de base 1 comprende además al menos un corte 2 en forma de corte pasante (a lo largo de todo el espesor de la lámina de base 1), hendidura (que se extiende a lo largo de parte del espesor de la lámina de base 1) u orificio. Cuando el corte 2 es una hendidura se extiende preferentemente a lo largo de todo el espesor de la segunda capa 1 .2 y a lo largo de parte del espesor de la primera capa 1.1 , y cuando el corte 2 es un corte o un orificio se extiende a lo largo de todo el espesor de la segunda capa 1.2 y a lo largo todo el espesor de la primera capa 1.1. De esta manera, en general, dicho corte 2 se extiende preferentemente a lo largo de todo el espesor de la segunda capa 1.2 y a lo largo de al menos parte del espesor de la primera capa 1.1 , preferentemente también de todo el espesor de dicha primera capa 1.1. Sheets 1 and 3 are preferably wound on respective coils, and are thus supplied from said coils (in this case they would be continuous sheets, as opposed to portions or sheets of sheet). The supplied base sheet 1 is formed by a plurality of layers of material, and, in particular, by at least a first layer 1.1 of cellulosic material and a second layer 1.2 of plastic material arranged on the first layer 1.1 and joined to said first layer 1.1, as represented in Figure 3. The union between layers 1.1 and 1.2 can be made by sealing or gluing, for example. The base sheet 1 further comprises at least one cut 2 in the form of a through cut (along the entire thickness of the base sheet 1), slit (extending along part of the thickness of the base sheet 1) or hole. When the cut 2 is a slit it preferably extends along the entire thickness of the second layer 1.2 and along part of the thickness of the first layer 1.1, and when the cut 2 is a cut or a hole it extends along the entire thickness of the second layer 1.2 and along the entire thickness of the first layer 1.1. In this way, in general, said cut 2 preferably extends along the entire thickness of the second layer 1.2 and along at least part of the thickness of the first layer 1.1, preferably also the entire thickness of said first layer. 1.1.
El corte 2 sirve para que el envase 300 resultante sea un envase abrefácil, que permite que la lámina de tapa 3 se desprenda fácilmente y pueda accederse al producto 200 envasado de una manera sencilla. El corte 2 estará por lo tanto próximo a un extremo del envase 300 resultante (o puede llegar hasta el extremo del envase 300), y puede estar en un córner del envase 300 o centrado por ejemplo, y no tiene por qué tener una forma determinada. Diferentes tipos de cortes para envases abrefácil son de sobra conocidos en el sector, como por ejemplo el descrito en EP0748746A1 , por lo que no se detalla más al respecto. De esta manera, a un primer lado L1 del corte 2 queda una porción de lámina de base 1 bajo la lámina de tapa 3, entre dicho corte 2 y el extremo o borde del envase 300 (ver figura 9), y el usuario actúa sobre esa porción y/o sobre la parte de la lámina de tapa 3 dispuesta sobre dicha porción para abrir el envase 300 final, comprendiendo dicha porción una cantidad de lámina de base 1 menor que la lámina de base 1 (y lámina de tapa 3 correspondiente) que queda al otro lado del corte 2 (segundo lado L2, opuesto al primer lado L1). Preferentemente, el método comprende además la operación de realizar el corte 2 en la lámina de base 1 , caso en el que dicho corte 2 se realiza antes de alimentar dicha lámina de base 1 a la estación de sellado 104. Dicho corte 2 puede realizarse en la propia máquina 100 o la lámina de base 1 puede llegar a dicha máquina 100 con dicho corte 2 ya realizado. The cut 2 serves so that the resulting container 300 is an easy-open container, which allows the lid sheet 3 to be easily detached and the packaged product 200 can be accessed in a simple way. The cut 2 will therefore be close to one end of the resulting container 300 (or may reach the end of the container 300), and may be in a corner of the container 300 or centered for example, and does not have to have a certain shape. . Different types of cuts for easy-open containers are well known in the sector, such as the one described in EP0748746A1, for example, so no further details are given in this regard. In this way, on a first side L1 of the cut 2 there remains a portion of base sheet 1 under the cover sheet 3, between said cut 2 and the end or edge of the container 300 (see figure 9), and the user acts on that portion and/or on the part of the lid sheet 3 arranged on said portion to open the final container 300, said portion comprising an amount of base sheet 1 less than the base sheet 1 (and corresponding lid sheet 3) which is on the other side of cut 2 (second side L2, opposite to the first side L1). Preferably, the method further comprises the operation of making the cut 2 in the base sheet 1, in which case said cut 2 is made before feeding said base sheet 1 to the sealing station 104. Said cut 2 can be made in the machine 100 itself or the base sheet 1 can arrive at said machine 100 with said cut 2 already made.
A la estación de sellado 104 se le suministran la lámina de base 1 y la lámina de tapa 3 de tal manera que dicha lámina de tapa 3 está por encima de dicha lámina de base 1 y enfrentada a la segunda capa 1.2 de la lámina de base 1 , y en dicha estación de sellado 104 se sella la lámina de tapa 3 a dicha segunda capa 1.2 de la lámina de base 1. Aunque no se ha representado en las figuras, el producto 200 a envasar se dispone sobre la lámina de base 1 antes de que dicha lámina de base 1 llegue a la estación de sellado 104, de tal manera que la lámina de tapa 3 se dispone sobre dicho producto 200 y, tras el sellado entre dichas láminas 1 y 3, el producto 200 queda envasado entre dichas láminas 1 y 3. The base sheet 1 and the cover sheet 3 are supplied to the sealing station 104 in such a way that said cover sheet 3 is above said base sheet 1 and facing the second layer 1.2 of the base sheet 1, and in said sealing station 104 the lid sheet 3 is sealed to said second layer 1.2 of the base sheet 1. Although not shown in the figures, the product 200 to be packaged is arranged on the base sheet 1 before said base sheet 1 reaches the sealing station 104, in such a way that the lid sheet 3 is arranged on said product 200 and, after sealing between said sheets 1 and 3, the product 200 is packaged between said plates 1 and 3.
Como resultado del sellado entre las láminas 1 y 3, especialmente cuando se realiza un envasado en segunda piel, es posible que parte de la lámina de tapa 3 se introduzca en el corte 2, tal y como se representa a modo de ejemplo en la figura 4. Esto puede ocasionar problemas a la hora de intentar abrir el envase 300 final generado, tal y como se ha descrito previamente. As a result of the sealing between sheets 1 and 3, especially when second skin packaging is carried out, it is possible that part of the lid sheet 3 is introduced into the cut 2, as shown as an example in the figure. 4. This may cause problems when trying to open the final generated container 300, as previously described.
Para evitar este problema, al menos en gran medida, en el método se fuerza un desplazamiento relativo entre una primera zona de lámina 1.3 de la lámina de base 1 que se extiende desde el corte 2 y que está a un lado del corte 2, preferentemente aguas abajo del corte 2 en la dirección de avance A, y una segunda zona de lámina 1.4 de la lámina de base 1 que se extiende desde el corte 2 y que está al otro lado del corte 2, preferentemente aguas arriba del corte 2 en dicha dirección de avance A, antes de sellar la lámina de tapa 3 a dicha lámina de base 1 o una vez realizado dicho sellado. Así, la primera zona de lámina 1.3 está a un lado del corte 2, mientras que la segunda zona de lámina 1 .4 está al lado opuesto del corte 2. El primer lado L1 está en una de las zonas de lámina 1.3 y 1.4, dependiendo de dónde esté realizado el corte 2, y el segundo lado L2 está en la otra zona de lámina 1 .3 o 1 .4. Cuando el corte 2 no se extiende a lo largo de todo el espesor de la lámina de base 1 , el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 provoca que el corte 2 se alargue hasta extenderse a lo largo de todo el espesor de dicha lámina de base 1. En las realizaciones del método en las que el desplazamiento entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza antes de sellar la lámina de tapa 3 a dicha lámina de base 1 , se dificulta que dicha lámina de tapa 3 se introduzca en el corte 2 cuando dicha lámina de tapa 3 se vaya a sellar a la lámina de base , puesto que con dicho desplazamiento se aumenta la distancia de separación entre las zonas de lámina 1.3 y 1.4 a ambos lados del corte 2, de tal manera que se aumenta la longitud de lámina de tapa 3 necesaria sobre el corte 2 para sellarse a dicha lámina de base 1 ; mientras que en las realizaciones del método en las que el desplazamiento entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza después de sellar la lámina de tapa 3 a dicha lámina de base 1 , se genera un estiramiento de la lámina de tapa 3 que, aun en los casos en los que se haya introducido parte de dicha lámina de tapa 3 en el corte 2, provoca que dicha parte (o gran parte de ella) salga de dicho corte 2. To avoid this problem, at least to a large extent, in the method a relative displacement is forced between a first sheet area 1.3 of the base sheet 1 extending from the cut 2 and which is on one side of the cut 2, preferably downstream of the cut 2 in the feed direction A, and a second sheet area 1.4 of the base sheet 1 extending from the cut 2 and which is on the other side of the cut 2, preferably upstream of the cut 2 in said direction of advance A, before sealing the cover sheet 3 to said base sheet 1 or once said sealing has been made. Thus, the first sheet area 1.3 is on one side of the cut 2, while the second sheet area 1.4 is on the opposite side of the cut 2. The first side L1 is on one of the sheet areas 1.3 and 1.4, depending on where the cut 2 is made, and the second side L2 is in the other sheet area 1 .3 or 1 .4. When the cut 2 does not extend along the entire thickness of the base sheet 1, the relative displacement between the sheet areas 1.3 and 1.4 causes the cut 2 to elongate until it extends along the entire thickness of said sheet. base sheet 1. In embodiments of the method in which the displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the cover sheet 3 to said base sheet 1, it is difficult for said cover sheet 3 to be introduce into the cut 2 when said cover sheet 3 is going to be sealed to the base sheet, since with said displacement the separation distance between the sheet areas 1.3 and 1.4 on both sides of the cut 2 increases, in such a way that the length of cover sheet 3 necessary on the cut 2 to seal to said base sheet 1 is increased; while in the embodiments of the method in which the displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out after sealing the cover sheet 3 to said base sheet 1, a stretching of the sheet is generated of cover 3 which, even in cases in which part of said cover sheet 3 has been introduced into the cut 2, causes said part (or a large part of it) to come out of said cut 2.
En una realización del método en la que el desplazamiento entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza después de sellar la lámina de tapa 3 a dicha lámina de base 1 , dicho desplazamiento provoca un estiramiento de al menos la parte de la lámina de tapa 3 que está sobre el corte 2 de la lámina de base 1 asegurándose al menos en gran medida que parte de dicha lámina de tapa 3 no quede introducida en dicho corte 2 tal y como se representa en la figura 5, lo que permite posteriormente abrir el envase 300 final resultante sin los problemas descritos. El estiramiento se realiza preferentemente fuera de la estación de sellado 104 (aguas abajo de la estación de sellado 104). Al estar la lámina de tapa 3 sellada a ambas zonas de lámina 1.3 y 1 .4 de la lámina de base 1 antes de provocar el desplazamiento relativo entre dichas zonas de lámina 1.3 y 1.4, dicho desplazamiento relativo provoca un estiramiento de dicha lámina de tapa 3, al menos en la parte de dicha lámina de tapa 3 que está entre las dos zonas de lámina 1.3 y 1.4 (que es la parte de dicha lámina de tapa 3 que está sobre el corte 2 de la lámina de base 1). In an embodiment of the method in which the displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out after sealing the cover sheet 3 to said base sheet 1, said displacement causes a stretching of at least the part of the cover sheet 3 that is on the cut 2 of the base sheet 1, ensuring at least to a large extent that part of said cover sheet 3 is not inserted in said cut 2 as shown in Figure 5, which allows the resulting final container 300 to be subsequently opened without the problems described. The stretching is preferably performed outside of sealing station 104 (downstream of sealing station 104). Since the cover sheet 3 is sealed to both sheet areas 1.3 and 1.4 of the base sheet 1 before causing the relative displacement between said sheet areas 1.3 and 1.4, said relative displacement causes a stretching of said cover sheet 3, at least in the part of said cover sheet 3 that is between the two sheet areas 1.3 and 1.4 (which is the part of said cover sheet 3 that is on the cut 2 of the base sheet 1).
En cualquier realización del método, para provocar el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4, preferentemente se provoca el desplazamiento ascendente o descendente de al menos una de las zonas de lámina 1.3 y 1.4 de la lámina de base 1 con respecto a la otra de dichas zonas de lámina 1.3 y 1 .4. En la figura 5 se representa este efecto en un envase 300 final resultante, a modo de ejemplo. En las realizaciones del método en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza después de sellar la lámina de tapa 3 a dicha lámina de base 1 , el desplazamiento de una zona de lámina 1 .3 o 1 .4 se puede realizar de la siguiente manera: se ejerce un empuje sobre la lámina de tapa 3 que está sobre sobre el corte 2 o sobre al menos una de las zonas de lámina 1.3 y 1.4, en una dirección descendente; y/o se empuja sobre el corte 2 (o debajo del corte 2) o sobre al menos una de las zonas de lámina 1.3 y .14 de la lámina de base 1 , en una dirección ascendente. In any embodiment of the method, to cause the relative displacement between the sheet areas 1.3 and 1.4, preferably the upward or downward displacement of at least one of the sheet areas 1.3 and 1.4 of the base sheet 1 is caused with respect to the another of said sheet areas 1.3 and 1.4. Figure 5 represents this effect in a resulting final container 300, as an example. In embodiments of the method in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out after sealing the cover sheet 3 to said base sheet 1, the displacement of a sheet area 1 .3 or 1 .4 can be carried out in the following way: a push is exerted on the cover sheet 3 that is on the cut 2 or on at least one of the sheet areas 1.3 and 1.4, in a downward direction; and/or is pushed onto the cut 2 (or below the cut 2) or onto at least one of the sheet areas 1.3 and .14 of the base sheet 1, in an upward direction.
Así, en las realizaciones del método en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza después de sellar la lámina de tapa 3 a dicha lámina de base 1 , se pueden tener al menos las siguientes opciones: ejercer una presión de empuje en una dirección ascendente o descendente sobre el corte 2; ejercer una presión de empuje en una dirección ascendente o descendente sobre únicamente la primera zona de lámina 1.3, provocándose el desplazamiento de dicha primera zona de lámina 1.3 en dicha dirección ascendente o descendente con respecto a la segunda zona de lámina 1.4; ejercer una presión de empuje en dirección ascendente o descendente sobre únicamente la segunda zona de lámina 1.4, provocándose el desplazamiento de dicha segunda zona de lámina 1.4 en dicha dirección ascendente o descendente con respecto a la primera zona de lámina 1.3; ejercer una presión de empuje en la misma dirección ascendente o descendente en ambas zonas de la lámina 1.3 y 1.4 provocándose el desplazamiento de dichas zona de lámina 1.3 y 1.4 en dicha dirección; y ejercer una presión de empuje en dirección ascendente o descendente sobre la primera zona de lámina 1.3 y ejercer una presión de empuje en una dirección opuesta sobre la segunda zona de lámina 1.4. En este último caso, así, se provoca el desplazamiento de la primera zona de lámina 1.3 en una dirección descendente y el desplazamiento de la segunda zona de lámina 1.4 en una dirección ascendente o el desplazamiento de la primera zona de lámina 1.3 en una dirección ascendente y el desplazamiento de la segunda zona de lámina 1.4 en una dirección descendente. Thus, in the embodiments of the method in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out after sealing the cover sheet 3 to said base sheet 1, at least the following options: exert thrust pressure in an upward or downward direction on cut 2; exerting a thrust pressure in an upward or downward direction on only the first sheet area 1.3, causing said first sheet area 1.3 to move in said upward or downward direction with respect to the second sheet area 1.4; exerting a thrust pressure in an upward or downward direction on only the second sheet area 1.4, causing said second sheet area 1.4 to move in said upward or downward direction with respect to the first sheet area 1.3; exert a thrust pressure in the same upward or downward direction in both areas of the sheet 1.3 and 1.4, causing the displacement of said sheet area 1.3 and 1.4 in said direction; and exerting a pushing pressure in an upward or downward direction on the first sheet area 1.3 and exerting a pushing pressure in an opposite direction on the second sheet area 1.4. In the latter case, thus, the displacement of the first sheet area 1.3 in a downward direction and the displacement of the second sheet area 1.4 in an upward direction or the displacement of the first sheet area 1.3 in an upward direction is caused. and moving the second sheet area 1.4 in a downward direction.
En algunas de estas realizaciones en la que se ejerce una presión sobre únicamente una de las zonas de lámina 1.3 y 1.4, la otra de las zonas de lámina 1.3 y 1.4 se mantiene en posición, presionándola contra una superficie o sujetándola con un útil a modo de pinza, por ejemplo. In some of these embodiments in which pressure is exerted on only one of the sheet areas 1.3 and 1.4, the other of the sheet areas 1.3 and 1.4 is held in position by pressing it against a surface or holding it with a tool as a clamp, for example.
Las direcciones ascendentes y descendentes son preferentemente verticales y opuestas. The ascending and descending directions are preferably vertical and opposite.
En las realizaciones del método en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza antes de sellar la lámina de tapa 3 a dicha lámina de base 1 , el desplazamiento relativo se puede forzar en la estación de sellado 104 o aguas arriba de la estación de sellado 104. En ambos casos, tras dicho forzado el primer lado L1 de la lámina de base 1 con respecto al corte 2 está elevado con respecto al segundo lado L2 de dicha lámina de base 1 con respecto a dicho corte 2. In embodiments of the method in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the lid sheet 3 to said base sheet 1, the relative displacement can be forced in the sealing station 104 or upstream of the sealing station 104. In both cases, after said forcing the first side L1 of the base sheet 1 with respect to the cut 2 is raised with respect to the second side L2 of said base sheet 1 with respect to said cut 2.
En las realizaciones en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza antes de sellar la lámina de tapa 3 a dicha lámina de base 1 y aguas arriba de la estación de sellado 104, el forzado se puede realizar, por ejemplo, mediante un actuador desplazadle que actúa sobre la lámina de base 1 empujándola para provocar el desplazamiento o mediante unos medios análogos a unos medios de actuación 105 descritos más adelante con relación a la máquina 100. In embodiments in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the cover sheet 3 to said base sheet 1 and upstream of the sealing station 104, the Forced action can be carried out, for example, by means of a displacement actuator that acts on the base sheet 1 by pushing it to cause displacement or by means analogous to actuation means 105 described later in relation to the machine 100.
La estación de sellado 104 comprende un molde superior de sellado 104.2 y un molde inferior de sellado 104.1 enfrentados que cooperan entre sí para realizar el sellado entre la lámina de tapa 3 y la lámina de base 1 dispuestas entre dichos moldes de sellado 104.1 y 104.2. El molde inferior de sellado 104.1 comprende una superficie superior 104.11 enfrentada al molde superior de sellado 104.2, y al menos en las realizaciones en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza antes de sellar la lámina de tapa 3 a dicha lámina de base 1 y en la estación de sellado 104, dicho molde inferior de sellado 104.1 puede comprender un saliente 104.10 que sobresale de dicho molde inferior de sellado 104.1 hacia el molde superior de sellado 104.2 tal y como se representa en las figuras 11a y 11 b. El saliente 104.10 puede ser un elemento adicional o puede estar integrado en la superficie superior 104.11. The sealing station 104 comprises an upper sealing mold 104.2 and a lower sealing mold 104.1 facing each other that cooperate with each other to perform the sealing between the lid sheet 3 and the base sheet 1 arranged between said sealing molds 104.1 and 104.2. The lower sealing mold 104.1 comprises an upper surface 104.11 facing the upper sealing mold 104.2, and at least in the embodiments in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the lid sheet 3 to said base sheet 1 and at the sealing station 104, said lower sealing mold 104.1 may comprise a projection 104.10 projecting from said lower sealing mold 104.1 towards the upper sealing mold 104.2 as shown. represented in figures 11a and 11 b. The projection 104.10 may be an additional element or may be integrated into the upper surface 104.11.
En el método, se dispone la lámina de base 1 en la estación de sellado 104 de tal manera que el primer lado L1 de dicha lámina de base 1 que está a un lado de un corte 2 se apoya sobre dicho saliente 104.10 (ver figura 11a), y con dicho primer lado L1 así apoyado (y con la lámina de base 1 preferentemente parada, sin avanzar en la dirección de avance A), se provoca el desplazamiento del segundo lado L2 de dicha lámina de base 1 , que está al otro lado de dicho corte 2, hacia la superficie superior 104.11 de dicho molde inferior de sellado 104.1. Al estar dicho primer lado L1 apoyado sobre el saliente 104.10, dicho desplazamiento fuerza un desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 asociadas a dicho corte 2, tal y como se refleja en la figura 11b. In the method, the base sheet 1 is arranged in the sealing station 104 in such a way that the first side L1 of said base sheet 1 that is on one side of a cut 2 rests on said projection 104.10 (see Figure 11a ), and with said first side L1 thus supported (and with the base sheet 1 preferably stopped, without advancing in the direction of advance A), the displacement of the second side L2 of said base sheet 1, which is on the other side, is caused. side of said cut 2, towards the upper surface 104.11 of said lower sealing mold 104.1. Since said first side L1 is supported on the projection 104.10, said displacement forces a relative displacement between the sheet areas 1.3 and 1.4 associated with said cut 2, as reflected in Figure 11b.
Preferentemente, para desplazar el segundo lado L2 de la lámina de base 1 hacia dicha superficie superior 104.11 , se aplica una succión S sobre dicho segundo lado L2 de la lámina de base 1 , a través de al menos un orificio 104.12 del molde inferior de sellado 104.1. Esta manera de desplazar dicho segundo lado L2 tiene una ventaja adicional, para los casos en los que el método de control se emplea en un envasado de segunda piel. En este tipo de envasados, un producto 200 queda envasado entre la lámina de base 1 y la lámina de tapa 3 al vacío, y dicha lámina de tapa 3 cubre el producto 200 siguiendo su contorno. Gracias a esta succión S y al espacio existente a través del corte 2, dicha succión S succiona además cualquier gas (aire normalmente) presente en el espacio delimitado entre ambas láminas 1 y 3 alrededor del producto 200, consiguiéndose un envase 300 con mejores acabados al evitarse en gran medida que dicho gas quede encerrado entre ambas láminas 1 y 3 en las inmediaciones del corte 2, puesto que se aumenta la capacidad de vaciado de dicho espacio frente a las técnicas convencionales empleadas para tal fin. El producto 200 se dispone sobre la lámina de base 1 aguas arriba de la estación de sellado 104, de tal manera que en dicha estación de sellado 104 la lámina de tapa 3 está dispuesta sobre dicho producto 200. En algunas de estas realizaciones, además, el saliente 104.10 es hueco al menos parcialmente y comprende un orificio comunicado con el exterior (no representado en las figuras), estando dicho orificio, preferentemente, en una pared lateral de dicho saliente 104.10 (la pared que queda enfrentada al corte 2 y, por lo tanto, a la separación entre los lados L1 y L2 de la lámina de base 1), provocándose la succión, además, a través de dicho orificio. Preferably, to move the second side L2 of the base sheet 1 towards said upper surface 104.11, a suction S is applied on said second side L2 of the base sheet 1, through at least one hole 104.12 of the lower sealing mold. 104.1. This The way of moving said second side L2 has an additional advantage, for cases in which the control method is used in second skin packaging. In this type of packaging, a product 200 is packaged between the base sheet 1 and the cover sheet 3 under vacuum, and said cover sheet 3 covers the product 200 following its contour. Thanks to this suction S and the space existing through the cut 2, said suction S also sucks any gas (normally air) present in the space delimited between both sheets 1 and 3 around the product 200, achieving a container 300 with better finishes. It is largely avoided that said gas is enclosed between both sheets 1 and 3 in the vicinity of the cut 2, since the emptying capacity of said space is increased compared to the conventional techniques used for this purpose. The product 200 is arranged on the base sheet 1 upstream of the sealing station 104, such that in said sealing station 104 the lid sheet 3 is arranged on said product 200. In some of these embodiments, furthermore, The projection 104.10 is at least partially hollow and includes a hole communicated with the outside (not shown in the figures), said hole being, preferably, in a side wall of said projection 104.10 (the wall that faces the cut 2 and, therefore, therefore, to the separation between the sides L1 and L2 of the base sheet 1), also causing suction through said hole.
En las realizaciones en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza antes de sellar la lámina de tapa 3 a dicha lámina de base 1 y aguas arriba de la estación de sellado 104, la estación de sellado 104 puede comprender también el saliente 104.10 descrito, para asegurar en mayor medida que se mantenga la elevación del primer lado L1 con respecto al segundo lado L2 de la lámina de base 1. En caso de no disponer de un saliente 104.10, se evitaría aplicar una succión sobre el primer lado L1 , para que no se eliminase dicha elevación. In embodiments in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the cover sheet 3 to said base sheet 1 and upstream of the sealing station 104, the sealing station 104 may also comprise the projection 104.10 described, to further ensure that the elevation of the first side L1 with respect to the second side L2 of the base sheet 1 is maintained. If a projection 104.10 is not available, it is I would avoid applying suction on the first side L1, so that this elevation would not be eliminated.
En las realizaciones en las que el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 se realiza antes de sellar la lámina de tapa 3 a la lámina de base 1 , cuando los moldes de sellado 104.1 y 104.2 de la estación de sellado 104 cooperan entre sí para sellar la lámina de tapa 3 a la lámina de base 1 , gracias a la elevación entre el primer lado L1 y el segundo lado L2 de dicha lámina de base 1 (provocado por el desplazamiento relativo entre la primera zona de lámina 1.3 y la segunda zona de lámina 1.4), la lámina de tapa 3 se sella a la lámina de base 1 sin penetrar en el corte 2 (o si lo hace, lo hace mínimamente de manera que posteriormente también se desprende de la lámina de base 1). En todas las realizaciones del método, preferentemente, el desplazamiento relativo entre la primera zona de lámina 1.3 y la segunda zona de lámina 1.4 de la lámina de base 1 se realiza con la lámina de tapa 3 y la lámina de base 1 paradas, es decir, cuando la lámina de tapa 3 y la lámina de base 1 no se desplazan en la dirección de avance A. In the embodiments in which the relative displacement between the sheet areas 1.3 and 1.4 of the base sheet 1 is carried out before sealing the cover sheet 3 to the base sheet 1, when the sealing molds 104.1 and 104.2 of the sealing station 104 cooperate with each other to seal the lid sheet 3 to the base sheet 1, thanks to the elevation between the first side L1 and the second side L2 of said base sheet 1 (caused by the relative displacement between the first sheet area 1.3 and the second sheet area 1.4), the cover sheet 3 is sealed to the base sheet 1 without penetrating the cut 2 (or if it does, it does so minimally so that it is subsequently also detached from the base sheet 1). In all embodiments of the method, preferably, the relative displacement between the first sheet area 1.3 and the second sheet area 1.4 of the base sheet 1 is carried out with the cover sheet 3 and the base sheet 1 stopped, i.e. , when the cover sheet 3 and the base sheet 1 do not move in the feed direction A.
Un segundo aspecto de la invención se refiere a una máquina 100 de envasado, como puede ser una máquina termo-formadora de envasado. La máquina 100 está adaptada para poder implementar el método de control propuesto en el primer aspecto de la invención, por lo que puede comprender cualquier configuración y/o realización necesaria para poder implementar las diferentes configuraciones y/o realizaciones de dicho método. La máquina 100 está además configurada para generar envases abrefácil. Preferentemente la máquina 100 está configurada para envasar productos 200 en envases 300 individuales generados a partir de la lámina de base 1 y la lámina de tapa 3, y, preferentemente, dicho envasado es un envasado en segunda piel. A second aspect of the invention relates to a packaging machine 100, such as a thermo-forming packaging machine. The machine 100 is adapted to be able to implement the control method proposed in the first aspect of the invention, so it can comprise any configuration and/or embodiment necessary to be able to implement the different configurations and/or embodiments of said method. The machine 100 is further configured to generate easy-open containers. Preferably the machine 100 is configured to package products 200 in individual packages 300 generated from the base sheet 1 and the lid sheet 3, and, preferably, said packaging is a second skin packaging.
La máquina 100 comprende unos medios de alimentación de lámina de base 101 configurados para suministrar una lámina de base 1 (preferentemente continua); unos medios de alimentación de lámina de tapa 103 configurados para suministrar una lámina de tapa 3 (preferentemente continua); una estación de sellado 104 configurada para recibir la lámina de tapa 3 y la lámina de base 1 en una dirección de avance A de las láminas 1 y 3 estando en una posición de reposo, y para sellar la lámina de tapa 3 a la lámina de base 1 estando en una posición de sellado; y puede comprender una estación de corte 107 aguas abajo de la estación de sellado 104 y configurada para cortar las láminas 1 y 3 y obtener como resultado los envases 300 individuales. La lámina de base 1 y la lámina de tapa 3 recorren un recorrido determinado respectivo en la máquina 100, siendo dicho recorrido el mismo una vez se han sellado. La estación de sellado 104 comprende un molde superior de sellado 104.2 y un molde inferior de sellado 104.1 enfrentados que cooperan entre sí para realizar el sellado entre la parte de la lámina de tapa 3 y la parte de la lámina de base 1 dispuestas entre dichos moldes de sellado 104.1 y 104.2, comprendiendo el molde inferior de sellado 104.1 una superficie superior 104.11 enfrentada al molde superior de sellado 104.2. The machine 100 comprises a base sheet feeding means 101 configured to supply a base sheet 1 (preferably continuous); lid sheet feeding means 103 configured to supply a lid sheet 3 (preferably continuous); a sealing station 104 configured to receive the cover sheet 3 and the base sheet 1 in a forward direction A of the sheets 1 and 3 while in a rest position, and to seal the cover sheet 3 to the base sheet base 1 being in a sealing position; and may comprise a cutting station 107 downstream of the sealing station 104 and configured to cut the sheets 1 and 3 and obtain individual containers 300 as a result. The base sheet 1 and the cover sheet 3 travel a respective determined path in the machine 100, said path being the same once they have been sealed. The sealing station 104 comprises an upper sealing mold 104.2 and a lower sealing mold 104.1 facing each other that cooperate with each other to perform the sealing between the part of the lid sheet 3 and the part of the base sheet 1 arranged between said molds. sealing mold 104.1 and 104.2, the lower sealing mold 104.1 comprising an upper surface 104.11 facing the upper sealing mold 104.2.
La máquina 100 puede comprender además una unidad de corte 102 dispuesta entre los medios de alimentación de lámina de base 101 y la estación de sellado 104, configurada para realizar al menos un corte 2 en la lámina de base 1 suministrada por los medios de alimentación de lámina de base 101. El corte 2 puede ser como el descrito previamente para el primer aspecto de la invención. La máquina 100 comprende además unos medios de transporte 108 configurados para sujetar al menos una de dichas láminas 1 y 3, en un plano de arrastre P horizontal, y para provocar un avance de las láminas 1 y 3 ya selladas con su actuación, y una unidad control 106 configurada para actuar sobre los medios de transporte 108 y provocar la actuación intermitente de los medios de transporte 108, provocando con cada actuación que dichas láminas 1 y 3 avancen una longitud de avance L determinada. Los medios de transporte 108 pueden ser convencionales y pueden comprender, por ejemplo, una cadena a cada lado de las láminas 1 y 3, unos actuadores por encima y por debajo de las láminas 1 y 3 para aprisionar y arrastrar dichas láminas 1 y 3, o una combinación de ambos. La máquina 100 comprende además unos medios de actuación 105. The machine 100 may further comprise a cutting unit 102 arranged between the base sheet feeding means 101 and the sealing station 104, configured to make at least one cut 2 in the base sheet 1 supplied by the base sheet feeding means. base sheet 101. Cut 2 may be as previously described for the first aspect of the invention. The machine 100 also comprises transport means 108 configured to hold at least one of said sheets 1 and 3, in a horizontal driving plane P, and to cause an advance of the already sealed sheets 1 and 3 with its action, and a control unit 106 configured to act on the transport means 108 and cause the intermittent actuation of the transport means 108, causing with each actuation said sheets 1 and 3 to advance a certain advance length L. The transport means 108 may be conventional and may comprise, for example, a chain on each side of the sheets 1 and 3, actuators above and below the sheets 1 and 3 to capture and drag said sheets 1 and 3, or a combination of both. The machine 100 also comprises actuation means 105.
La unidad de control 106 está configurada para disponer enfrentada a los medios de actuación 105 una primera zona de lámina 1.3 de la lámina de base 1 que se extiende desde dicho corte 2 y que está a un lado del corte 2, preferentemente aguas abajo del corte 2 en la dirección de avance A, y/o una segunda zona de lámina 1.4 de la lámina de base 1 que se extiende desde dicho corte 2 y que está al otro lado del corte 2, preferentemente aguas arriba del corte 2 en dicha dirección de avance A, cuando se suministra una lámina de base 1 con al menos un corte 2. Dichos medios de actuación 105 están configurados para actuar sobre la menos una de dichas zonas de lámina 1.3 y 1.4 y para forzar, con dicha actuación, un desplazamiento relativo entre dicha primera zona de lámina 1.3 y dicha segunda zona de lámina 1.4 de la lámina de base 1. The control unit 106 is configured to arrange facing the actuation means 105 a first sheet area 1.3 of the base sheet 1 that extends from said cut 2 and is on one side of the cut 2, preferably downstream of the cut. 2 in the direction of advance A, and/or a second sheet area 1.4 of the base sheet 1 that extends from said cut 2 and which is on the other side of the cut 2, preferably upstream of the cut 2 in said direction of advance advance A, when a base sheet 1 is supplied with at least one cut 2. Said actuation means 105 are configured to act on at least one of said sheet areas 1.3 and 1.4 and to force, with said actuation, a relative displacement between said first sheet area 1.3 and said second sheet area 1.4 of the base sheet 1.
Los medios de actuación 105 están dispuestos de tal manera que, con su actuación, provocan el desplazamiento ascendente o descendente de al menos una de las zonas de lámina 1.3 y 1.4 de la lámina de base 1 para forzar el desplazamiento relativo entre dichas zonas de lámina 1.3 y 1.4, cuando dichos medios de actuación 105 son actuados estando enfrentados a al menos una de dichas zonas de lámina 1 .3 y 1 .4 de una lámina de base 1 . The actuation means 105 are arranged in such a way that, with their actuation, they cause the upward or downward displacement of at least one of the sheet areas 1.3 and 1.4 of the base sheet 1 to force the relative displacement between said sheet areas. 1.3 and 1.4, when said actuation means 105 are actuated while facing at least one of said sheet areas 1.3 and 1.4 of a base sheet 1.
En algunas realizaciones (como en la primera realización mostrada en la figura 1 por ejemplo), los medios de actuación 105 están dispuestos aguas abajo de la estación de sellado 104, de tal manera que están configurados para con su actuación provocar un estiramiento de al menos la parte de la lámina de tapa 3 que está sobre el corte 2 de dicha lámina de base 1 , provocándose el desplazamiento ascendente o descendente de al menos una de las zonas de lámina 1.3 y 1.4 de la lámina de base 1. En estas realizaciones, los medios de actuación 105 comprenden al menos un primer útil de actuación 105.1 desplazadle entre una posición de reposo y una posición de actuación. Los medios de actuación 105 están además aguas arriba de la estación de corte 107. En la posición de reposo, el primer útil de actuación 105.1 está dispuesto por encima o por debajo del plano de arrastre P, y en la posición de actuación, dicho primer útil de actuación 105.1 sobrepasa el plano de arrastre P actuando sobre una zona de actuación del recorrido de las láminas 1 y 3. De esta manera, cuando hay láminas 1 y 3 en la máquina 100, el primer útil de actuación 105.1 actúa sobre las láminas 1 y 3 selladas entre sí. Cuando está en la posición de actuación, dicho primer útil de actuación 105.1 está dispuesto en una posición dependiente de la disposición de la unidad de corte 102 y de la longitud de avance L determinada en el recorrido de la lámina de base 1 , de tal manera que cuando es actuado, el primer útil de actuación 105.1 provoca el estiramiento de la lámina de tapa 3 dispuesta sobre el corte 2 de la lámina de base 1 al actuar sobre dichas láminas 1 y 3. In some embodiments (such as in the first embodiment shown in Figure 1 for example), the actuation means 105 are arranged downstream of the sealing station 104, in such a way that they are configured to cause a stretch of at least the part of the cover sheet 3 that is on the cut 2 of said base sheet 1, causing the upward or downward displacement of at least one of the sheet areas 1.3 and 1.4 of the base sheet 1. In these embodiments, The actuation means 105 comprise at least a first actuation tool 105.1 that moves between a position of rest and an action position. The actuation means 105 are also upstream of the cutting station 107. In the rest position, the first actuation tool 105.1 is arranged above or below the driving plane P, and in the actuation position, said first Actuation tool 105.1 exceeds the driving plane P acting on an area of action of the path of sheets 1 and 3. In this way, when there are sheets 1 and 3 in the machine 100, the first actuation tool 105.1 acts on the sheets 1 and 3 sealed together. When it is in the actuation position, said first actuation tool 105.1 is arranged in a position dependent on the arrangement of the cutting unit 102 and the advance length L determined in the path of the base sheet 1, in such a way that when actuated, the first actuating tool 105.1 causes the stretching of the cover sheet 3 arranged on the cut 2 of the base sheet 1 by acting on said sheets 1 and 3.
El primer útil de actuación 105.1 está dispuesto de tal manera que cuando pasa a la posición de actuación, dicho primer útil de actuación 105.1 actúa en la zona de actuación cuyo centro está a una distancia con respecto a la unidad de corte 102 igual a un múltiplo entero de la longitud de avance L determinada en el recorrido de la lámina de base 1 , comprendiendo dicha zona de actuación una longitud igual o menor que el 20% de dicha longitud de avance L determinada en dicho recorrido. De esta manera en la máquina 100 se asegura un desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 de la lámina de base 1 que están a los lados del corte 2, provocándose el estiramiento de la lámina de tapa 3 al menos en la parte que está sobre dicho corte 2. The first actuation tool 105.1 is arranged in such a way that when it moves to the actuation position, said first actuation tool 105.1 acts in the actuation zone whose center is at a distance with respect to the cutting unit 102 equal to a multiple integer of the advance length L determined in the path of the base sheet 1, said action zone comprising a length equal to or less than 20% of said advance length L determined in said path. In this way, in the machine 100, a relative displacement is ensured between the sheet areas 1.3 and 1.4 of the base sheet 1 that are on the sides of the cut 2, causing the stretching of the cover sheet 3 at least in the part that It is on said cut 2.
En algunas realizaciones en las que los medios de actuación 105 de la máquina 100 están dispuestos aguas abajo de la estación de sellado 104, dichos medios de actuación 105 comprenden únicamente un útil de actuación 105.1. En otras realizaciones en las que dichos medios de actuación 105 están dispuestos aguas abajo de la estación de sellado 104, los medios de actuación 105 de la máquina 100 comprenden además del primer útil de actuación 105.1 un segundo útil de actuación 105.2 dispuesto aguas abajo o aguas arriba del primer útil de actuación 105.1 en la dirección de avance A, siendo dicho segundo útil de actuación 105.2, al igual que el primer útil de actuación 105.1 , desplazadle entre una posición de reposo en la que está dispuesto por encima o por debajo del plano de arrastre P y una posición de actuación, en la que actúa en la zona de actuación, y para ello, preferentemente sobrepasa el plano de arrastre P. En los medios de actuación 105 que comprenden dos útiles de actuación 105.1 y 105.2, dichos útiles de actuación 105.1 y 105.2 están dispuestos de manera que cada uno de ellos actúa en la zona de actuación, en un lado respectivo con respecto al corte 2 (un útil de actuación 105.1 o 105.2 en el primer lado L1 y el otro útil de actuación 105.1 o 105.2 en el segundo lado L2). Preferentemente ambos útiles de actuación 105.1 y 105.2 son actuados por un mismo actuador de los medios de actuación 105. In some embodiments in which the actuation means 105 of the machine 100 are arranged downstream of the sealing station 104, said actuation means 105 comprise only one actuation tool 105.1. In other embodiments in which said actuation means 105 are arranged downstream of the sealing station 104, the actuation means 105 of the machine 100 comprise, in addition to the first actuation tool 105.1, a second actuation tool 105.2 arranged downstream or downstream. above the first actuation tool 105.1 in the direction of advance A, said second actuation tool 105.2, like the first actuation tool 105.1, moving it between a rest position in which it is arranged above or below the plane of drag P and an actuation position, in which it acts in the actuation zone, and to do so, it preferably exceeds the drag plane P. In the actuation means 105 that comprise two actuation tools 105.1 and 105.2, said actuation tools 105.1 and 105.2 are arranged so that each of them acts in the actuation zone, on a respective side with respect to the cut 2 (a actuation tool 105.1 or 105.2 on the first side L1 and the other actuation tool 105.1 or 105.2 on the second side L2). Preferably, both actuation tools 105.1 and 105.2 are actuated by the same actuator of the actuation means 105.
Los medios de actuación 105 que comprenden dos útiles de actuación 105.1 y 105.2 pueden comprender diferentes configuraciones. Por ejemplo: The actuation means 105 comprising two actuation tools 105.1 and 105.2 may comprise different configurations. For example:
En una primera configuración, el primer útil de actuación 105.1 está configurado para estar dispuesto por encima del plano de arrastre P y el segundo útil de actuación 105.2 está configurado para estar dispuesto por debajo de dicho plano de arrastre P, cuando están en la posición de reposo, y están configurados para desplazarse en direcciones opuestas para pasar a la posición de actuación respectiva. Por ejemplo, el primer útil de actuación 105.1 se desplaza en una dirección descendente y el segundo útil se desplaza en una dirección ascendente. In a first configuration, the first actuation tool 105.1 is configured to be arranged above the drive plane P and the second actuation tool 105.2 is configured to be arranged below said drive plane P, when they are in the position of rest, and are configured to move in opposite directions to move to the respective actuation position. For example, the first actuating tool 105.1 moves in a downward direction and the second tool moves in an upward direction.
En una segunda configuración, mostrada a modo de ejemplo en las figuras 6 a 8, tanto el primer útil de actuación 105.1 como el segundo útil de actuación 105.2 están configuración para estar dispuestos por encima del plano de arrastre P, cuando están en la posición de reposo. Preferentemente el primer útil de actuación 105.1 está configurado para avanzar una longitud mayor que el segundo útil de actuación 105.2 cuando pasan a la posición de actuación respectiva (ver figura 8), de tal manera que el segundo útil de actuación 105.1 presiona las láminas 1 y 3 contra una superficie de apoyo 105.30 para mantenerlas sujetas mientras que el primer útil de actuación 105.1 empuja dichas láminas 1 y 3 para obtener el estiramiento de la lámina de tapa 3. En estos casos los medios de actuación 105 pueden comprender un soporte 105.3 que comprende la superficie de apoyo 105.30, y dicho soporte 105.3 puede comprender además una ranura 105.31 para permitir la actuación del primer útil de actuación 105.1. In a second configuration, shown by way of example in Figures 6 to 8, both the first actuation tool 105.1 and the second actuation tool 105.2 are configured to be arranged above the driving plane P, when they are in the position of repose. Preferably the first actuation tool 105.1 is configured to advance a greater length than the second actuation tool 105.2 when they move to the respective actuation position (see Figure 8), in such a way that the second actuation tool 105.1 presses the sheets 1 and 3 against a support surface 105.30 to keep them subject while the first actuation tool 105.1 pushes said sheets 1 and 3 to obtain the stretching of the cover sheet 3. In these cases the actuation means 105 may comprise a support 105.3 that comprises the support surface 105.30, and said support 105.3 may further comprise a slot 105.31 to allow the actuation of the first actuation tool 105.1.
En otras realizaciones de la máquina 100, los medios de actuación 105 están dispuestos en, o asociados a, la estación de sellado 104, y comprenden un saliente 104.10 que sobresale de la superficie superior 104.11 del molde inferior de sellado 104.1 hacia el molde superior de sellado 104.2, como se muestra en la figura 11a, y un dispositivo de actuación 104.13. El saliente 104.10 puede ser un elemento adicional o puede estar integrado en la superficie superior 104.11. El saliente 104.10 está configurado para soportar la lámina de base 1 , y el dispositivo de actuación 104.13 está configurado para aplicar una succión S sobre dicha superficie superior 104.11 a través del molde inferior de sellado 104.1 (a través de al menos un orificio 104.12 de dicho molde inferior de sellado 104.1), al menos en una zona de dicha superficie superior 104.11 próxima al saliente 104.10. La unidad de control 106 está configurada para disponer una zona de lámina 1.3 o 1.4 de dicha lámina de base 1 sobre el saliente 104.10 (el primer lado L1) y la otra zona de lámina 1.3 o 1.4 (el segundo lado L2) sobre la zona de la superficie superior 104.11 del molde inferior de sellado 104.1 que está adyacente al saliente 104.10, cuando se suministra una lámina de base 1 con un corte 2 a la estación de sellado 104. De esta manera, cuando se provoca la actuación de los medios de actuación 105 se provoca que el dispositivo de actuación 104.13 aplique una succión S en dicha zona, atrayendo el segundo lado L2 de la lámina de base 1 hacia la superficie superior 104.11 del molde inferior de sellado 104.1 , desplazándolo con respecto al primer lado L1 que queda apoyado sobre el saliente 104.10, forzándose el desplazamiento relativo entre las zonas de lámina 1.3 y 1.4 (efecto resultante mostrado en la figura 11b, donde se muestra además la lámina de tapa 3 sellada a la lámina de base 1). En algunas de estas realizaciones, además, el saliente 104.10 es hueco al menos parcialmente y comprende un orificio comunicado con el exterior (no representado en las figuras), estando dicho orificio, preferentemente, en una pared lateral de dicho saliente 104.10 (la pared que queda enfrentada al corte 2 y, por lo tanto, a la separación entre los lados L1 y L2 de la lámina de base 1), provocándose la succión, además, a través de dicho orificio. In other embodiments of the machine 100, the actuation means 105 are arranged in, or associated with, the sealing station 104, and comprise a projection 104.10 that protrudes from the upper surface 104.11 of the lower sealing mold 104.1 towards the upper mold of sealing. sealing 104.2, as shown in Figure 11a, and an actuation device 104.13. The projection 104.10 may be an additional element or may be integrated into the upper surface 104.11. The projection 104.10 is configured to support the base sheet 1, and the actuation device 104.13 is configured to apply a suction S on said upper surface 104.11 through the lower sealing mold 104.1 (through at least one hole 104.12 of said lower sealing mold 104.1), at least in an area of said upper surface 104.11 close to the projection 104.10. The control unit 106 is configured to arrange a sheet area 1.3 or 1.4 of said base sheet 1 on the projection 104.10 (the first side L1) and the other sheet area 1.3 or 1.4 (the second side L2) on the area of the upper surface 104.11 of the lower sealing mold 104.1 which is adjacent to the projection 104.10, when a base sheet 1 with a cut 2 is supplied to the sealing station 104. In this way, when the actuation of the sealing means is caused Actuation 105 causes the actuation device 104.13 to apply a suction S in said area, attracting the second side L2 of the base sheet 1 towards the upper surface 104.11 of the lower sealing mold 104.1, displacing it with respect to the first side L1 that remains. supported on the projection 104.10, forcing the relative displacement between the sheet areas 1.3 and 1.4 (resulting effect shown in Figure 11b, where the cover sheet 3 is also shown sealed to the base sheet 1). In some of these embodiments, furthermore, the projection 104.10 is at least partially hollow and comprises a hole communicated with the outside (not shown in the figures), said hole being, preferably, in a side wall of said projection 104.10 (the wall that is facing the cut 2 and, therefore, the separation between the sides L1 and L2 of the base sheet 1), also causing suction through said hole.
En estas realizaciones de la máquina 100 en las que los medios de actuación 105 están dispuestos en, o asociados a, la estación de sellado 104, el saliente 104.10 está dispuesto en el recorrido de la lámina de tapa 1 en una posición dependiente de la posición de la unidad de corte 102 y de la longitud de avance L determinada. El saliente 104.10 está dispuesto de tal manera que cuando la unidad de control 106 provoca el avance de las láminas 1 y 3 dicha longitud determinada L, una zona de lámina 1.3 o 1.4 de dicha lámina de base 1 queda dispuesta sobre sobre el saliente 104.10 (apoyada en dicho saliente 104.10), comprendiendo dicha zona de lámina 1.3 o 1.4 el primer lado L1 de la lámina de base 1 descrito previamente. In these embodiments of the machine 100 in which the actuation means 105 are arranged in, or associated with, the sealing station 104, the projection 104.10 is arranged in the path of the lid sheet 1 in a position dependent on the position of the cutting unit 102 and the determined feed length L. The projection 104.10 is arranged in such a way that when the control unit 106 causes the advance of the sheets 1 and 3 said determined length L, a sheet area 1.3 or 1.4 of said base sheet 1 is arranged on the projection 104.10 ( supported on said projection 104.10), said sheet area 1.3 or 1.4 comprising the first side L1 of the base sheet 1 described previously.
La unidad de control 106 está configurada para provocar el desplazamiento sincronizado y /o coordinado de los medios de actuación 105, de la estación de sellado 104, de la unidad de corte 102, la estación de corte 107 y de los medios de transporte 108. The control unit 106 is configured to cause the synchronized and/or coordinated movement of the actuation means 105, the sealing station 104, the cutting unit 102, the cutting station 107 and the transport means 108.

Claims

REIVINDICACIONES Método de control para una máquina de envasado, en el que a una estación de sellado (104) de la máquina (100), en una dirección de avance (A) se le suministran una lámina de tapa (3) continua de material plástico y una lámina de base (1) continua que comprende al menos un corte (2) que se extiende a lo largo de al menos parte del espesor de la lámina de base (1), y en la estación de sellado (104) se sella dicha lámina de tapa (3) a dicha lámina de base (1), caracterizado porque la lámina de base (1) que se suministra está formada por al menos una primera capa (1.1) de material celulósico y una segunda capa (1. CLAIMS Control method for a packaging machine, in which a sealing station (104) of the machine (100), in a direction of advance (A), is supplied with a continuous lid sheet (3) of plastic material and a continuous base sheet (1) comprising at least one cut (2) that extends along at least part of the thickness of the base sheet (1), and at the sealing station (104) is sealed. said cover sheet (3) to said base sheet (1), characterized in that the base sheet (1) that is supplied is formed by at least a first layer (1.1) of cellulosic material and a second layer (1.
2) de material plástico dispuesta sobre la primera capa (1.1) y unida a dicha primera capa (1.1), forzándose en el método un desplazamiento relativo entre una primera zona de lámina (1.3) de la lámina de base (1) que se extiende desde el corte (2) y que está a un lado de dicho corte (2), preferentemente aguas abajo del corte (2) en la dirección de avance (A), y una segunda zona de lámina (1.4) de la lámina de base (1) que se extiende desde el corte (2) y que está al otro lado de dicho corte (2), preferentemente aguas arriba del corte (2) en dicha dirección de avance (A), antes de sellar la lámina de tapa (3) a dicha lámina de base (1) o una vez realizado dicho sellado. Método de control según la reivindicación 1 , en donde se provoca el desplazamiento ascendente o descendente de al menos una de las zonas de lámina (1.3, 1 .4) de la lámina de base (1) para generar el desplazamiento relativo entre dichas zonas de lámina (1.3, 1.4). Método de control según la reivindicación 1 o 2, en donde el desplazamiento relativo entre la primera zona de lámina (1.3) de la lámina de base (1) y la segunda zona de lámina (1 .4) de la lámina de base (1) se realiza, al menos parcialmente, una vez sellada la lámina de tapa (3) a dicha lámina de base (1), provocándose un estiramiento de al menos la parte de la lámina de tapa (3) que está sobre el corte (2) de la lámina de base (1). Método de control según cualquiera de las reivindicaciones 1 a 3, en donde se dispone un producto (200) sobre la lámina de base (1) aguas arriba de la estación de sellado (104), se cubre dicho producto (200) con la lámina de tapa (3) en la estación de sellado (104), se envasa dicho producto (200) en segunda piel entre dicha lámina de tapa (3) y dicha lámina de base (1) en la estación de sellado (104), y, aguas abajo de la estación de sellado (104), se cortan dicha lámina de base (1) y dicha lámina de tapa (3) generándose un envase (300) individual con dicho producto (200) envasado, y en donde el desplazamiento relativo entre la primera zona de lámina (1.3) de la lámina de base (1) y la segunda zona de lámina (1.4) de la lámina de base (1) se realiza, al menos parcialmente, antes de sellar la lámina de tapa (3) a dicha lámina de base (1) y en la estación de sellado (104) o aguas arriba de la estación de sellado (104), forzándose para ello un desplazamiento relativo entre la primera zona de lámina (1.2) of plastic material arranged on the first layer (1.1) and attached to said first layer (1.1), the method forcing a relative displacement between a first sheet area (1.3) of the base sheet (1) that extends from the cut (2) and which is on one side of said cut (2), preferably downstream of the cut (2) in the direction of advance (A), and a second sheet area (1.4) of the base sheet (1) that extends from the cut (2) and is on the other side of said cut (2), preferably upstream of the cut (2) in said direction of advance (A), before sealing the cover sheet ( 3) to said base sheet (1) or once said sealing has been made. Control method according to claim 1, wherein the upward or downward displacement of at least one of the sheet areas (1.3, 1.4) of the base sheet (1) is caused to generate the relative displacement between said areas of sheet (1.3, 1.4). Control method according to claim 1 or 2, wherein the relative displacement between the first sheet area (1.3) of the base sheet (1) and the second sheet area (1.4) of the base sheet (1 ) is carried out, at least partially, once the cover sheet (3) is sealed to said base sheet (1), causing a stretching of at least the part of the cover sheet (3) that is above the cut (2 ) of the base sheet (1). Control method according to any of claims 1 to 3, wherein a product (200) is placed on the base sheet (1) upstream of the sealing station (104), said product (200) is covered with the sheet of lid (3) in the sealing station (104), said product (200) is packaged in a second skin between said lid sheet (3) and said base sheet (1) in the sealing station (104), and , downstream of the sealing station (104), said base sheet (1) and said cover sheet (3) are cut, generating an individual container (300) with said packaged product (200), and wherein the relative displacement between the first sheet area (1.3) of the base sheet (1) and the second sheet area (1.4) of the base sheet base (1) is made, at least partially, before sealing the lid sheet (3) to said base sheet (1) and at the sealing station (104) or upstream of the sealing station (104), For this purpose, a relative displacement is forced between the first sheet area (1.
3) de la lámina de base (1) y la segunda zona de lámina (1 .3) of the base sheet (1) and the second sheet area (1.
4) de dicha lámina de base (1) de tal manera que tras dicho forzado un primer lado (L1) de la lámina de base (1) a un lado del corte (2) está elevado con respecto a un segundo lado (L2) de dicha lámina de base (1) a un lado del corte (2) opuesto al primer lado (L1), siendo el primer lado (L1) el lado de la lámina de base (1) con respecto al corte (2) que en el envase (300) individual generado comprende menor cantidad de lámina de base (1). 4) of said base sheet (1) in such a way that after said forcing a first side (L1) of the base sheet (1) on one side of the cut (2) is elevated with respect to a second side (L2) of said base sheet (1) to a side of the cut (2) opposite to the first side (L1), the first side (L1) being the side of the base sheet (1) with respect to the cut (2) that in The individual container (300) generated comprises a smaller amount of base sheet (1).
5. Método de control según la reivindicación 4, en donde para forzar un desplazamiento relativo entre la primera zona de lámina (1.3) de la lámina de base (1) y la segunda zona de lámina (1.4) de dicha lámina de base (1) se actúa sobre el primer lado (L1) de la lámina de base (1) aguas arriba de la estación de sellado (104), deformándose dicho primer lado (L1). 5. Control method according to claim 4, wherein to force a relative displacement between the first sheet area (1.3) of the base sheet (1) and the second sheet area (1.4) of said base sheet (1 ) acts on the first side (L1) of the base sheet (1) upstream of the sealing station (104), deforming said first side (L1).
6. Método de control según la reivindicación 4 o 5, en donde la estación de sellado (104) comprende un molde superior de sellado (104.2) y un molde inferior de sellado (104.1) enfrentados que cooperan entre sí para realizar el sellado entre la lámina de tapa (3) y la lámina de base (1) dispuestas entre dichos moldes de sellado (104.1 , 104.2), apoyándose el primer lado (L1) de la lámina de base (1) sobre un saliente (104.10) que sobresale de una superficie superior (104.11 ) del molde inferior de sellado (104.1 ) que está enfrentada al molde superior de sellado (104.2), hacia dicho molde superior de sellado (104.2), y provocándose el desplazamiento del segundo lado (L2) de la lámina de base (1) hacia dicha superficie superior (104.11) del molde inferior de sellado (104.1) para forzar un desplazamiento relativo entre la primera zona de lámina (1 .3) y la segunda zona de lámina (1.4) de dicha lámina de base (1). 6. Control method according to claim 4 or 5, wherein the sealing station (104) comprises an upper sealing mold (104.2) and a lower sealing mold (104.1) facing each other that cooperate with each other to perform the sealing between the lid sheet (3) and the base sheet (1) arranged between said sealing molds (104.1, 104.2), the first side (L1) of the base sheet (1) resting on a projection (104.10) that protrudes from an upper surface (104.11) of the lower sealing mold (104.1) that is facing the upper sealing mold (104.2), towards said upper sealing mold (104.2), and causing the displacement of the second side (L2) of the sheet of base (1) towards said upper surface (104.11) of the lower sealing mold (104.1) to force a relative displacement between the first sheet area (1.3) and the second sheet area (1.4) of said base sheet ( 1).
7. Método de control según la reivindicación 6, en donde para desplazar el segundo lado (L2) de la lámina de base (1) hacia dicha superficie superior (104.11) del molde inferior de sellado (104.1) se aplica una succión sobre dicho segundo lado (L2) de la lámina de base (1), a través del molde inferior de sellado (104.1). Método de control según la reivindicación 6 o 7, en donde el corte (2) de la lámina de base (1) es un corte que se extiende a lo largo de todo el espesor de la lámina de base (1), o dicho corte (2) se extiende a lo largo de parte de dicho espesor de tal manera que el desplazamiento relativo entre la primera zona de lámina (1.3) y la segunda zona de lámina (1.4) de dicha lámina de base (1) provoca que el corte (2) se extienda a lo largo de todo el espesor de dicha lámina de base (1), succionándose la lámina de base (1) contra el molde inferior de sellado (104.1) de tal manera que se genera una succión de al menos parte del aire presente entre dichas láminas (1 , 3) a través del corte (2). Método de control según cualquiera de las reivindicaciones 4 a 8, en donde el desplazamiento relativo entre la primera zona de lámina (1 .3) y la segunda zona de lámina (1 .4) de dicha lámina de base (1) se realiza con la lámina de tapa (3) y la lámina de base (1) paradas. Método de control según la reivindicación 3, en donde para provocar el desplazamiento relativo entre las zonas de lámina (1.3, 1.4) de la lámina de base (1) se empuja la parte de la lámina de tapa (3) que está sobre el corte (2) en una dirección no horizontal, o se empuja al menos una de dichas zonas de lámina (1.3, 1.4) en una dirección no horizontal. Método de control según la reivindicación 10, en donde para provocar el desplazamiento relativo entre la primera zona de lámina (1.3) y la segunda zona de lámina (1.4) de la lámina de base (1) se empujan las dos zonas de lámina (1.3, 1.4) de la lámina de base (1), provocándose con dichos empujes el desplazamiento de la primera zona de lámina7. Control method according to claim 6, wherein to move the second side (L2) of the base sheet (1) towards said upper surface (104.11) of the lower sealing mold (104.1) a suction is applied on said second side (L2) of the base sheet (1), through the lower sealing mold (104.1). Control method according to claim 6 or 7, wherein the cut (2) of the base sheet (1) is a cut that extends along the entire thickness of the base sheet (1), or said cut (2) extends along part of said thickness in such a way that the relative displacement between the first sheet area (1.3) and the second sheet area (1.4) of said base sheet (1) causes the cut (2) extends along the entire thickness of said base sheet (1), the base sheet (1) being sucked against the lower sealing mold (104.1) in such a way that a suction of at least part is generated. of the air present between said sheets (1, 3) through the cut (2). Control method according to any of claims 4 to 8, wherein the relative displacement between the first sheet area (1.3) and the second sheet area (1.4) of said base sheet (1) is carried out with the cover sheet (3) and the base sheet (1) stop. Control method according to claim 3, wherein to cause the relative displacement between the sheet areas (1.3, 1.4) of the base sheet (1) the part of the cover sheet (3) that is on the cut is pushed (2) in a non-horizontal direction, or at least one of said sheet areas (1.3, 1.4) is pushed in a non-horizontal direction. Control method according to claim 10, wherein to cause the relative displacement between the first sheet area (1.3) and the second sheet area (1.4) of the base sheet (1), the two sheet areas (1.3) are pushed , 1.4) of the base sheet (1), with said thrusts causing the displacement of the first sheet area
(1.3) en una dirección descendente y el desplazamiento de la segunda zona de lámina(1.3) in a downward direction and the displacement of the second sheet zone
(1.4) en una dirección ascendente o el desplazamiento de la primera zona de lámina (1.3) en una dirección ascendente y el desplazamiento de la segunda zona de lámina (1.4) en una dirección descendente. Método de control según la reivindicación 0, en donde para provocar el desplazamiento relativo entre la primera zona de lámina (1.3) y la segunda zona de lámina (1.4) de la lámina de base (1) se empuja únicamente una de las zonas de lámina (1.3, 1.4) de la lámina de base (1), provocándose con dicho empuje el desplazamiento de dicha zona de lámina (1.3, 1.4) en una dirección ascendente o descendente. Método de control según la reivindicación 12, en donde para provocar el desplazamiento relativo entre la primera zona de lámina (1.3) y la segunda zona de lámina (1.4) de la lámina de base (1) se empuja una de las zonas de lámina (1.3, 1.4) de la lámina de base (1), y se mantiene estática la otra zona de lámina (1.3, 1.4) de la lámina de base (1). Método de control según cualquiera de las reivindicaciones 1 a 13, en donde se provoca un avance intermitente de la lámina de base (1) y de la lámina de tapa (3), desplazándose dichas láminas (1 , 3) una longitud determinada en cada avance. Método de control según cualquiera de las reivindicaciones 1 a 14, en donde se genera el corte (2) en la lámina de base (1) antes de suministrar dicha lámina de base (1) a la estación de sellado (104). Máquina de envasado que comprende unos medios de alimentación de lámina de base (101) configurados para suministrar una lámina de base (1); unos medios de alimentación de lámina de tapa (103) configurados para suministrar una lámina de tapa (3); una estación de sellado (104) que estando en una posición de reposo está configurada para recibir la lámina de tapa (3) y la lámina de base (1) en una dirección de avance (A) y que estando en una posición de sellado está configurada para sellar la lámina de tapa (3) a la lámina de base (1); unos medios de transporte (108) configurados para sujetar al menos una de dichas láminas (1 , 3) y para provocar un avance de las láminas (1 , 3) ya selladas con su actuación; una unidad de control (106) configurada para provocar una actuación intermitente de los medios de transporte (108) y que, con cada actuación de los medios de transporte (108), dichos medios de transporte (108) provoquen un avance de las láminas (1 , 3) de una longitud de avance (L) determinada en la dirección de avance (A); y unos medios de actuación (105), caracterizada porque cuando la lámina de base (1) comprende al menos un corte (2) que se extiende a lo largo de al menos parte del espesor de dicha lámina de base (1), la unidad de control (106) está configurada para disponer enfrentada a los medios de actuación (105) una primera zona de lámina (1.3) de la lámina de base (1) que está a un lado del corte (2), preferentemente aguas abajo del corte (2) en la dirección de avance (A), y que se extiende desde dicho corte (2) y/o una segunda zona de lámina (1.4) de la lámina de base (1) que está al otro lado de dicho corte (2), preferentemente aguas arriba del corte (2) en dicha dirección de avance (A), y que se extiende desde dicho corte (2), estando dichos medios de actuación (105) configurados para actuar sobre la menos una de dichas zonas de lámina (1.3, 1.4) y para forzar, con dicha actuación, un desplazamiento relativo entre dicha primera zona de lámina (1.3) y dicha segunda zona de lámina (1.4) de la lámina de base (1). Máquina de envasado según la reivindicación 16, en donde los medios de actuación (105) están dispuestos de tal manera que, con su actuación, provocan el desplazamiento ascendente o descendente de al menos una de las zonas de lámina (1.3, 1 .4) de la lámina de base (1) para generar el desplazamiento relativo entre dichas zonas de lámina (1.3, 1.4), cuando dichos medios de actuación (105) son actuados estando enfrentados a al menos una de dichas zonas de lámina (1.3, 1.4) de una lámina de base (1). Máquina de envasado según la reivindicación 16 o 17, en donde los medios de actuación (105) están dispuestos aguas abajo de la estación de sellado (104), de tal manera que están configurados para provocar un estiramiento de al menos la parte de la lámina de tapa (3) que está sobre el corte (2) de dicha lámina de base (1) con su actuación, provocándose el desplazamiento ascendente o descendente de al menos una de las zonas de lámina (1.3, 1.4) de la lámina de base (1). Máquina de envasado según la reivindicación 16 o 17, en donde la estación de sellado (104) comprende un molde superior de sellado (104.2) y un molde inferior de sellado(1.4) in an upward direction or the displacement of the first sheet area (1.3) in an upward direction and the displacement of the second sheet area (1.4) in a downward direction. Control method according to claim 0, wherein to cause the relative displacement between the first sheet area (1.3) and the second sheet area (1.4) of the base sheet (1) only one of the sheet areas is pushed (1.3, 1.4) of the base sheet (1), with said push causing the displacement of said sheet area (1.3, 1.4) in an upward or downward direction. Control method according to claim 12, wherein to cause the relative displacement between the first sheet area (1.3) and the second sheet area (1.4) of the base sheet (1) one of the sheet areas (1) is pushed 1.3, 1.4) of the base sheet (1), and the other sheet area (1.3, 1.4) of the base sheet (1) is kept static. Control method according to any of claims 1 to 13, wherein an intermittent advance of the base sheet (1) and the cover sheet (3) is caused, said sheets (1, 3) moving a certain length in each Advance. Control method according to any of claims 1 to 14, wherein the cut (2) is generated in the base sheet (1) before supplying said base sheet (1) to the sealing station (104). Packaging machine comprising a base sheet feeding means (101) configured to supply a base sheet (1); lid sheet feeding means (103) configured to supply a lid sheet (3); a sealing station (104) which when in a rest position is configured to receive the cover sheet (3) and the base sheet (1) in a forward direction (A) and which when in a sealing position is configured to seal the cover sheet (3) to the base sheet (1); transport means (108) configured to hold at least one of said sheets (1, 3) and to cause the already sealed sheets (1, 3) to advance with their action; a control unit (106) configured to cause an intermittent operation of the transport means (108) and that, with each operation of the transport means (108), said transport means (108) cause an advance of the sheets ( 1, 3) of a feed length (L) determined in the feed direction (A); and actuation means (105), characterized in that when the base sheet (1) comprises at least one cut (2) that extends along at least part of the thickness of said base sheet (1), the unit The control unit (106) is configured to have a first sheet area (1.3) of the base sheet (1) facing the actuation means (105), which is on one side of the cut (2), preferably downstream of the cut. (2) in the direction of advance (A), and which extends from said cut (2) and/or a second sheet area (1.4) of the base sheet (1) that is on the other side of said cut ( 2), preferably upstream of the cut (2) in said direction of advance (A), and extending from said cut (2), said actuation means (105) being configured to act on at least one of said zones of sheet (1.3, 1.4) and to force, with said actuation, a relative displacement between said first sheet area (1.3) and said second sheet area (1.4) of the base sheet (1). Packaging machine according to claim 16, wherein the actuation means (105) are arranged in such a way that, with their actuation, they cause the upward or downward movement of at least one of the sheet areas (1.3, 1.4). of the base sheet (1) to generate the relative displacement between said sheet areas (1.3, 1.4), when said actuation means (105) are actuated while facing at least one of said sheet areas (1.3, 1.4) of a base sheet (1). Packaging machine according to claim 16 or 17, wherein the actuation means (105) are arranged downstream of the sealing station (104), in such a way that they are configured to cause stretching of at least part of the sheet of cover (3) that is on the cut (2) of said base sheet (1) with its action, causing the upward or downward movement of at least one of the sheet areas (1.3, 1.4) of the base sheet (1). Packaging machine according to claim 16 or 17, wherein the sealing station (104) comprises an upper sealing mold (104.2) and a lower sealing mold
(104.1) enfrentados que cooperan entre sí para realizar el sellado entre una lámina de tapa (3) y una lámina de base (1) dispuestas entre dichos moldes de sellado (104.1 , 104.2), estando dispuestos los medios de actuación (105) en la estación de sellado (104), y comprendiendo dichos medios de actuación (105) un saliente (104.10) que sobresale de una superficie superior (104.11) del molde inferior de sellado (104.1) que está enfrentada al molde superior de sellado (104.2), hacia dicho molde superior de sellado(104.1) facing each other that cooperate with each other to carry out the sealing between a cover sheet (3) and a base sheet (1) arranged between said sealing molds (104.1, 104.2), the actuation means (105) being arranged in the sealing station (104), and said actuation means (105) comprising a projection (104.10) projecting from an upper surface (104.11) of the lower sealing mold (104.1) that is facing the upper sealing mold (104.2) , towards said upper sealing mold
(104.2), y que está configurada para soportar la lámina de base (1), y un dispositivo de actuación que está configurado para aplicar una succión sobre dicha superficie superior (104.11) a través del molde inferior de sellado (104.1), al menos en una zona de dicha superficie superior (104.11) que está adyacente al saliente (104.10). Máquina de envasado según la reivindicación 19, en donde la unidad de control (106) está configurada, cuando se suministra una lámina de base (1) con un corte (2) a la estación de sellado (104), para disponer una zona de lámina (1.3, 1.4) de dicha lámina de base (1) sobre el saliente (104.10) y la otra zona de lámina (1.3, 1.4) sobre la zona de la superficie superior (104.11) del molde inferior de sellado (104.1) que está adyacente al saliente (104.10). Máquina de envasado según las reivindicaciones 19 o 20, que comprende una unidad de corte (102) dispuesta aguas arriba de la estación de sellado (104) y configurada para realizar al menos un corte (2) en una lámina de base (1) y que está configurada para envasar productos (200) en envases (300) individuales generados a partir de la lámina de base (1) y la lámina de tapa (3), estando el saliente (104.10) dispuesto, en el recorrido de la lámina de base (1), en una posición dependiente de la longitud de avance (L) y de la posición de la unidad de corte (2), de tal manera que cuando la unidad de control (106) provoca el avance de las láminas (1 , 3) dicha longitud determinada (L), una zona de lámina (1.3, 1.4) de dicha lámina de base (1) queda dispuesta sobre el saliente (104.10), comprendiendo dicha zona de lámina (1.3, 1.4) un primer lado (L1) de la lámina de base (1) a un lado del corte (2) que se corresponde con el lado de la lámina de base (1) con respecto al corte (2) que en un envase (300) individual generado en la máquina (100) comprende menor cantidad de lámina de base (1). Máquina de envasado según la reivindicación 18, que comprende una unidad de corte (102) dispuesto aguas arriba de la estación de sellado (104) y configurada para realizar al menos un corte (2) en una lámina de base (1), estando los medios de transporte (108) configurados para sujetar al menos una de dichas láminas (1 , 3) en un plano de arrastre (P) horizontal, y comprendiendo los medios de actuación (105) al menos un primer útil de actuación (105.1) desplazadle entre una posición de reposo, en la que está dispuesto por encima o por debajo del plano de arrastre (P) en el recorrido de las láminas (1 , 3), y una posición de actuación, en la que sobrepasa el plano de arrastre (P) y actúa en una zona de actuación en el recorrido de las láminas (1 , 3), estando dispuesto el primer útil de actuación (105.1) de tal manera que al pasar a la posición de actuación actúa en la zona de actuación cuyo centro está a una distancia con respecto a la unidad de corte (102) igual a un múltiplo entero de la longitud de avance (L) determinada en el recorrido de la lámina de base (1), comprendiendo dicha zona de actuación una longitud igual o menor que el 20% de dicha longitud de avance (L) determinada en dicho recorrido. Máquina de envasado según la reivindicación 22, en donde los medios de actuación (105) comprenden al menos un segundo útil de actuación (105.2) dispuesto aguas abajo o aguas arriba del primer útil de actuación (105.1) en la dirección de avance (A) y desplazable entre una posición de reposo, en la que está dispuesto por encima o por debajo del plano de arrastre (P) en el recorrido de las láminas (1 , 3), y una posición de actuación, en la que sobrepasa el plano de arrastre (P) y actúa en una zona de actuación en el recorrido de las láminas (1 , 3), estando el primer útil de actuación (105.1) configurado para estar dispuesto por encima o por debajo del plano de arrastre (P) en la posición de reposo y estando el segundo útil de actuación (105.2) configurado para estar dispuesto al lado contrario que el primer útil de actuación (105.1), con respecto al plano de arrastre (P), en la posición de reposo, y estando el primer útil de actuación (105.1) y el segundo útil de actuación (105.2) configurados para actuar uno a cada lado del centro de la zona de actuación en el recorrido de las láminas (1 , 3). Máquina de envasado según la reivindicación 22, en donde los medios de actuación (105) comprenden al menos un segundo útil de actuación (105.2) dispuesto aguas abajo o aguas arriba del primer útil de actuación (105.1) en la dirección de avance (A) y desplazable entre una posición de reposo, en la que está dispuesto por encima o por debajo del plano de arrastre (P) en el recorrido de las láminas (1 , 3), y una posición de actuación, en la que sobrepasa el plano de arrastre (P) y actúa en una zona de actuación en el recorrido de las láminas (1 , 3), estando el primer útil de actuación (105.1) configurado para estar dispuesto por encima o por debajo del plano de arrastre (P) y estando el segundo útil de actuación (105.2) configurado para estar dispuesto al mismo lado con respecto al plano de arrastre (P) que el primer útil de actuación (105.1), en la posición de reposo, estando los útiles de actuación (105.1 , 105.2) dispuestos de tal manera que actúan cada uno a un lado del centro de la zona de actuación al pasar a la posición de actuación respectiva. Máquina de envasado según la reivindicación 23 o 24, en donde los medios de actuación (105) comprenden un soporte (105.3) dispuesto al lado contrario con respecto al plano de arrastre (P) que el segundo útil de actuación (105.2) en la posición de reposo, enfrentado a dicho segundo útil de actuación (105.2) cuando dicho segundo útil de actuación (105.2) está en la posición de actuación, y dispuesto de tal manera que limita el desplazamiento del segundo útil de actuación (105.2) cuando dicho segundo útil de actuación (105.2) se desplaza a la posición de actuación. Máquina de envasado según cualquiera de las reivindicaciones 16 a 25, en donde la unidad de control (106) está configurada para provocar el desplazamiento sincronizado y/o coordinado de los medios de actuación (105), de la estación de sellado (104), de la unidad de corte (102) y de los medios de transporte (108). (104.2), and which is configured to support the base sheet (1), and an actuation device that is configured to apply a suction on said upper surface (104.11) through the lower sealing mold (104.1), at least in an area of said upper surface (104.11) that is adjacent to the projection (104.10). Packaging machine according to claim 19, wherein the control unit (106) is configured, when a base sheet (1) with a cut (2) is supplied to the sealing station (104), to provide a zone of sheet (1.3, 1.4) of said base sheet (1) on the projection (104.10) and the other sheet area (1.3, 1.4) on the area of the upper surface (104.11) of the lower sealing mold (104.1) which is adjacent to the projection (104.10). Packaging machine according to claims 19 or 20, comprising a cutting unit (102) arranged upstream of the sealing station (104) and configured to make at least one cut (2) in a base sheet (1) and which is configured to package products (200) in individual containers (300) generated from the base sheet (1) and the cover sheet (3), the projection (104.10) being arranged, in the path of the sheet of base (1), in a position dependent on the advance length (L) and the position of the cutting unit (2), in such a way that when the control unit (106) causes the advance of the sheets (1 , 3) said determined length (L), a sheet area (1.3, 1.4) of said base sheet (1) is arranged on the projection (104.10), said sheet area (1.3, 1.4) comprising a first side ( L1) of the base sheet (1) to one side of the cut (2) that corresponds to the side of the base sheet (1) with respect to the cut (2) that in an individual container (300) generated in the Machine (100) comprises a smaller amount of base sheet (1). Packaging machine according to claim 18, comprising a cutting unit (102) arranged upstream of the sealing station (104) and configured to make at least one cut (2) in a base sheet (1), the transport means (108) configured to hold at least one of said sheets (1, 3) on a horizontal driving plane (P), and the actuation means (105) comprising at least one first actuation tool (105.1) that moves between a rest position, in which it is arranged above or below the driving plane (P) in the path of the blades (1, 3), and an actuation position, in which it exceeds the driving plane ( P) and acts in an action zone along the path of the blades (1, 3), the first action tool (105.1) being arranged in such a way that when it moves to the action position it acts in the action zone whose center It is at a distance with respect to the cutting unit (102) equal to an integer multiple of the advance length (L) determined in the path of the base sheet (1), said action zone comprising a length equal to or less than 20% of said advance length (L) determined in said path. Packaging machine according to claim 22, wherein the actuation means (105) comprise at least one second actuation tool (105.2) arranged downstream or upstream of the first actuation tool (105.1) in the direction of advance (A) and movable between a rest position, in which it is arranged above or below the driving plane (P) in the path of the blades (1, 3), and an actuation position, in which it exceeds the driving plane (P) and acts in an actuation area in the path of the sheets (1, 3), the first actuation tool (105.1) being configured to be arranged above or below the driving plane (P) in the position of rest and the second actuation tool (105.2) being configured to be arranged on the opposite side of the first actuation tool (105.1), with respect to the driving plane (P), in the rest position, and the first tool being actuation tool (105.1) and the second actuation tool (105.2) configured to act one on each side of the center of the actuation area in the path of the blades (1, 3). Packaging machine according to claim 22, wherein the actuation means (105) comprise at least one second actuation tool (105.2) arranged downstream or upstream of the first actuation tool (105.1) in the direction of advance (A) and movable between a rest position, in which it is arranged above or below the driving plane (P) in the path of the sheets (1, 3), and an actuation position, in which it exceeds the plane of drag (P) and acts in an actuation area in the path of the sheets (1, 3), the first actuation tool (105.1) being configured to be arranged above or below the drag plane (P) and being the second actuation tool (105.2) configured to be arranged on the same side with respect to the driving plane (P) as the first actuation tool (105.1), in the rest position, the actuation tools (105.1, 105.2) being arranged in such a way that each one acts on one side of the center of the acting area when moving to the respective acting position. Packaging machine according to claim 23 or 24, wherein the actuation means (105) comprise a support (105.3) arranged on the opposite side with respect to the driving plane (P) than the second actuation tool (105.2) in the position of rest, facing said second actuation tool (105.2) when said second actuation tool (105.2) is in the actuation position, and arranged in such a way that it limits the displacement of the second actuation tool (105.2) when said second actuation tool (105.2) actuation position (105.2) moves to the actuation position. Packaging machine according to any of claims 16 to 25, wherein the control unit (106) is configured to cause synchronized displacement and/or coordination of the actuation means (105), the sealing station (104), the cutting unit (102) and the transport means (108).
PCT/ES2022/070680 2022-03-11 2022-10-21 Control method for a packaging machine and associated packaging machine WO2023170320A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP22382236.2A EP4242117A1 (en) 2022-03-11 2022-03-11 Control method for a packaging machine and associated packaging machine
EPEP22382236.2 2022-03-11
EP22382726 2022-07-28
EPEP22382726.2 2022-07-28

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Citations (6)

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GB2086833A (en) * 1980-11-11 1982-05-19 Grace W R & Co Flexible easy-open package
EP0748746A1 (en) 1995-06-14 1996-12-18 Grace A.G. Easy-to-open thermoplastic package
WO2011003567A2 (en) * 2009-07-08 2011-01-13 Tetra Laval Holdings & Finance S.A. Robust packaging laminate, method for manufacturing of the packaging laminate and packaging container produced therefrom
US20170157885A1 (en) * 2014-07-08 2017-06-08 Sig Technology Ag A sheet-like composite, especially for containers, with an adhesion-promoting layer characterised by different c=o group absorption maxima
US20170320649A1 (en) * 2015-01-30 2017-11-09 Future Labo Co., Ltd. Peel-openable package and opening structure for peel-openable package

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1510115A (en) * 1974-06-20 1978-05-10 Grace W R & Co Laminate film for use in vacuum packaging
GB2086833A (en) * 1980-11-11 1982-05-19 Grace W R & Co Flexible easy-open package
EP0748746A1 (en) 1995-06-14 1996-12-18 Grace A.G. Easy-to-open thermoplastic package
WO2011003567A2 (en) * 2009-07-08 2011-01-13 Tetra Laval Holdings & Finance S.A. Robust packaging laminate, method for manufacturing of the packaging laminate and packaging container produced therefrom
US20170157885A1 (en) * 2014-07-08 2017-06-08 Sig Technology Ag A sheet-like composite, especially for containers, with an adhesion-promoting layer characterised by different c=o group absorption maxima
US20170320649A1 (en) * 2015-01-30 2017-11-09 Future Labo Co., Ltd. Peel-openable package and opening structure for peel-openable package

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