EP4146559A1 - Valve adhésive, feuille et emballage pour des produits alimentaires et procédé de production de ladite valve adhésive et de ladite feuille - Google Patents

Valve adhésive, feuille et emballage pour des produits alimentaires et procédé de production de ladite valve adhésive et de ladite feuille

Info

Publication number
EP4146559A1
EP4146559A1 EP21734202.1A EP21734202A EP4146559A1 EP 4146559 A1 EP4146559 A1 EP 4146559A1 EP 21734202 A EP21734202 A EP 21734202A EP 4146559 A1 EP4146559 A1 EP 4146559A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
flexible
flexible membrane
incision
label
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21734202.1A
Other languages
German (de)
English (en)
Other versions
EP4146559B1 (fr
EP4146559C0 (fr
Inventor
Valerio Binda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Masterpack SpA
Original Assignee
Masterpack SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Masterpack SpA filed Critical Masterpack SpA
Publication of EP4146559A1 publication Critical patent/EP4146559A1/fr
Application granted granted Critical
Publication of EP4146559B1 publication Critical patent/EP4146559B1/fr
Publication of EP4146559C0 publication Critical patent/EP4146559C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element

Definitions

  • the present description relates to an adhesive valve, in particular an adhesive and flexible valve which can be applied onto incisions or openings formed on hermetically sealed containers, for example coffee containers, and similar packaging for shelf food products, where it is required to be able to discharge gas from the inside, while always maintaining a sealed closure preventing the entry of gas, in order to avoid the visual effect of an inflated package.
  • the present adhesive valve therefore has the purpose of releasing any gas which forms inside the packaging even at very low pressures of the order of 10 mbar. Therefore, the present label is not specifically intended for the packaging of food products to be heated in microwaves.
  • the present description also relates to a sheet and a container for food products comprising said adhesive valve as well as a method for manufacturing this adhesive valve or sheet.
  • the patent EP2275252 describes an adhesive valve which comprises a flexible label having at least one lower surface provided with adhesive, wherein a flexible membrane is applied to the lower surface of the flexible label, is completely covered by the flexible label and has a substantially non-adhesive lower surface.
  • a gas venting valve In order to act as a gas venting valve, one or more incisions are formed in the flexible label and positioned straddling the plan-view projection of the perimeter of the flexible membrane.
  • the venting gas throughput is very much influenced by the type of adhesive used to fix the valve to the container, so that if the adhesive is too strong it is difficult for the label to lift up at the incisions, namely opening occurs at relatively high pressures, while if it is too weak there is the risk that the valve does not perform correctly its sealed closure function.
  • the publication W02015/111015A1 describes a similar adhesive valve, in which the flexible membrane is always completely covered by the flexible label, but is provided with incisions which intersect with incisions formed in the flexible label.
  • US 2006/0076058 A1 describes an adhesive valve in which the opening pressures of the valve are very low.
  • such a conventional valve has a substantial drawback associated with its suitability for industrial production: in fact the flexible label and the flexible membrane have the same area, with the result that the flexible label cannot adhere to the sheet of the container such that the sheet or strip-like support of the adhesive valves cannot be punched in order to obtain the respective flexible membranes.
  • the problem underlying the present invention is therefore that of discharging gas at low pressures, namely about 10 mbar, or even lower, without giving rise to the aforementioned drawbacks.
  • the task of the present invention is therefore that of providing an adhesive valve which solves this problem.
  • an object of the present invention is to provide an adhesive valve which allows faster venting of gases than conventional adhesive valves.
  • Another task of the present invention is to propose a method for manufacturing an adhesive valve which is simple and low-cost to implement, while allowing the creation of adhesive valves which allow gases to be discharged at low pressures and more rapidly compared to conventional valves.
  • the adhesive valve allows regulation of the gas flow though the incisions or incision in the sheet which forms the walls of a container onto which the adhesive valve is applied.
  • the non-adherent portion allows raising of the flexible label of the valve in the presence of gas under pressure, so as to create a gas flow passage between the incisions of sheet and those of the flexible label, even when this sheet is pulled or folded.
  • valve and the sheet according to the present description may furthermore be manufactured using a relatively simple, low-cost and rapid method, preferably involving mass-production, in particular if continuous and uniform layers are used to form the flexible label, the flexible membrane and/or the adhesive layer between them.
  • Figures la and lb show, respectively, a top and bottom plan view of an adhesive valve
  • Figures lc shows a top plan view of the adhesive valve according to Figures la and lb applied to a sheet;
  • Figures Id and le show corresponding components of the adhesive valve shown in Figures la and lb, relating to a flexible label and a flexible membrane, respectively;
  • Figures 2 and 3 show top plan views of two variants of the adhesive valve according to Figures la and lb;
  • Figures 4a and 4b show a further variant of the adhesive valve shown in Figures la and lb;
  • Figures 5 and 6 show diagrams of the possible steps in a method for manufacturing an adhesive valve according to the present invention
  • Figures 7a and 7b illustrate operation of an adhesive valve according to the invention with reference to the valve shown in Figures 2, viewed in cross-section along the plane VII- VII.
  • an adhesive valve according to the present invention comprises:
  • At least one flexible label 1 which has an upper surface and a lower surface la, wherein at least the lower surface la is provided with adhesive and at least one incision lb connects the two surfaces;
  • At least one flexible membrane 2 which has an upper surface and a lower surface 2a and which adheres to the at least one portion provided with adhesive of the lower surface la of the flexible label 1.
  • the lower surface 2a of the flexible membrane 2 is substantially non-adhesive, and, in plan view, a portion of the flexible membrane 2 is arranged under the incision lb of the flexible label 1.
  • the flexible label 1 in plan view, has at least one flap which extends beyond the flexible membrane 2 in order to adhere to a sheet 5 so as to retain on the latter said flexible membrane 2.
  • the flexible label 1 has at least one flap which extends beyond the perimeter of the flexible membrane 2.
  • the flexible label may have a central part which, in plan view, is superimposed on the flexible membrane 2, for example two opposite ends which extend from the central part beyond a perimeter of the flexible membrane so as to be able to secure it to a sheet 5 on which the adhesive valve 100 is applied with the flexible membrane arranged between the sheet 5 and the flexible layer 1.
  • the flexible label 1 and the flexible membrane 2 may be configured and joined so that, viewing in plan view adhesive valve 100, the flexible membrane 2 is situated within the perimeter of the flexible label 1.
  • the adhesive valve 100 has a perimetral portion of the flexible label 1 which adheres directly to the sheet 5 and which surrounds the flexible membrane 2.
  • the adhesive valve 100 has a particular feature in that the lower surface la of the flexible label 1 comprises at least one non-adherent portion which in plan view, is adjacent to the flexible membrane 2 or at least partially superimposed on the latter.
  • the incision lb in plan view, crosses the non-adherent portion 4 and is not spaced from the latter.
  • the adhesive valve 100 comprises, in a manner known per se, at least one flexible label 1 having two surfaces and at least one lower surface la provided with adhesive.
  • At least one flexible membrane 2 having two surfaces may be applied under the lower surface la of the flexible label 1 and has a substantially non-adhesive lower surface 2a, namely a surface which is not provided with adhesive or in any case is substantially less adherent than the lower surface la of the flexible label 1 provided with adhesive.
  • the upper surface of the flexible membrane 2, in contact with the lower surface la of the flexible label 1, is substantially non-adhesive so as to allow gas to penetrate between them overcoming the tendency of natural adhesion of the two surfaces, namely the Van der Vaals force in combination with the accumulation of electrostatic charges due to the chemical nature of the adhesive, which tends to keep them in mutually adhering contact.
  • the flexible membrane 2 is preferably obtained by means of punching of a support 3 made of the same material, in sheet or strip form, which has a greater area than the flexible label 1 and on which one or more flexible layers 1 of the same type, arranged in at least one row, may be applied.
  • the label or the flexible labels 1 may also be obtained by means of punching of a sheet or strip with larger dimensions, having a surface provided with adhesive, wherein the surplus part, namely the part not comprising the label or the labels 1, is removed after application of the labels on the support 3.
  • the flexible label 1 and the flexible membrane 2 may be obtained from a film of plastic material suitable for coming into contact with food products, belonging in particular to the group composed of polypropylene (for example with a thickness of between 35 and 60 microns), polyester (for example with a thickness of between 25 and 45 microns) or plastic materials with equivalent characteristics.
  • the film of the layer of the flexible membrane 2 may comprise paper, polyethylene terephthalate and/or enriched polypropylene or a PE-RVOH laminate.
  • the film of the flexible label 1 may be formed by a laminate with several layers, in particular comprising the same plastic materials, polyethylene, paper, aluminium and/or a polyamide film, for example with a thickness of between for example 10 and 20 microns, or a PE-EVOH-PE laminate.
  • the film of the flexible label 1 may be made of recyclable materials such as polylactic acid and/or may be a multilayer laminate, comprising an inner layer, which comprises the lower surface la, made for example of a material from among those indicated above, as well as an outer layer, which comprises the upper surface, preferably made of a barrier material which increases the impermeability of the label 1.
  • the material which forms the flexible label 1 is less rigid than the material which forms the flexible membrane 2.
  • the flexible label may comprise a combination of polypropylene, which may have a thickness of about 30 microns, and PE-EVOH, which may have a thickness of about 40 microns, where the flexible membrane 2 may comprise a layer of polyethylene terephthalate, having a thickness which may be between about 120 microns and 12 microns and preferably equal to 30 microns.
  • One or both the surface of the flexible membrane 2 may be treated with a material which is preferably suitable for alimentary use and able to make the membrane non adherent or only slightly adherent, in particular silicone or another coating of a per se conventional, but in any case dry type.
  • the layer of adhesive which may be applied to the lower surface la of the flexible label 1 may be an adhesive of the PSA (Pressure Sensitive Adhesive) type, in particular may be an acrylic adhesive which is water-based or of the UV crosslinking type or an acrylic adhesive with organic solvent, or may be a silicone-based adhesive suitable for high temperatures (up to 250°C) depending on the particular implementational requirements of the invention.
  • PSA Pressure Sensitive Adhesive
  • acrylic adhesive which is water-based or of the UV crosslinking type or an acrylic adhesive with organic solvent
  • silicone-based adhesive suitable for high temperatures (up to 250°C) depending on the particular implementational requirements of the invention.
  • the flexible label 1 is shaped with at least one incision lb so as to connect the two surfaces of the flexible label 1.
  • the incision lb may be straight or curved, as in the embodiment shown in Figures la to 4a, or may be closed, so as to define at least one opening, for example a substantially circular hole which may have a diameter not greater than 10 mm, in the flexible layer 1, such that at least one portion of the upper surface of the flexible membrane 2 is not covered by the flexible label 1, in plan view.
  • the incision lb may form a recess on the edge of the flexible membrane 1 so that a portion of the perimeter of the flexible label 1, when viewing the adhesive valve 100 in plan view, passes above the flexible membrane 2 and this portion therefore divides the flexible membrane 2 into a portion not covered by the flexible label 1 and into at least one remaining portion covered by the flexible label 1.
  • the area of the portion of the flexible membrane 2 covered by the flexible label 1 may be greater than the area of the portion of the flexible membrane 2 not covered by the flexible label 1.
  • the flexible label 1 may have a substantially polygonal and/or curvilinear form, for example a square form, as for example shown in the attached figures, or for example a circular or triangular form, with the comers which are rounded and may be provided with anti- tamper slits, not shown.
  • the flexible membrane 2 has a substantially circular form, or polygonal and/or curvilinear form, so that the flexible membrane 2 may, in plan view, cover the incision lb of the flexible label 1.
  • the lower surface la of the flexible label 1 comprises at least one non-adherent portion 4 which may be obtained by avoiding the application of the adhesive in this portion or more preferably by applying and allowing to dry a substance designed to prevent or limit adhesion, for example in particular an anti-adhesive varnish or lacquer, for example of the type referred to in the sector as "glue killer". Therefore, this substance, once applied onto the adhesive of the flexible label 1, deactivates its adhesive action.
  • the non-adherent portion 4 may also be obtained by applying a shaped film onto the adhesive of the flexible label 1.
  • the non-adherent portion 4 covers at least partially a portion of the flexible membrane 2.
  • the flexible membrane 2 may have at least one incision 2c, also indicated by way of example in Figure 7a by means of a broken-line rectangle, which connects its two surfaces in order to facilitate, also across it, a gas flow from the opening 5a to the incision lb.
  • the non-adherent portion 4 may comprises at least a part thereof which, in plan view, extends towards an edge of the flexible membrane 2, tapering towards the latter and widening away from it so that, during use, it is able to define a diverging channel for gas which is directed towards the incision lb and which penetrates between the flexible membrane 2 and the non-adherent portion 4.
  • Figure 2 shows an embodiment of the present invention which has two non-adherent portions 4 which, in plan view, are in diametrically opposite positions with respect to the flexible membrane 2. Each has a narrow section which extends straddling the edge of the flexible membrane 2 and widens out as far as the incision lb, which crosses it.
  • Figures 7 and 7b show a cross-sectional view of the adhesive valve of Figure 2 along the cross-section VII- VII, applied to a sheet 5 with an incision 5a which encloses a gas inside it, where the adhesive valve 100 is applied on the outside so as to cover the opening 5a with the flexible membrane 2.
  • the operation of the adhesive valve 100 is described below, although the same description of operation applies, mutatis mutandis, in general to an adhesive valve according to the present invention.
  • Figure 7a shows a condition in which the pressure of the gas which acts on the inside of the sheet 5 is not greater than the pressure of the environment on the outside of the sheet 5.
  • the flexible membrane 2 adheres to the sheet 5, closing the incision 5a thereof, owing to the adhesion between the flexible membrane 2 and the sheet 5 which may be produced by the electrostatic charges and/or the Van der Waals interaction.
  • the incision lb is closed as a result of the adhesion of the flexible label 1 onto the flexible membrane 2 which, in each non-adherent portion 4, is due to the Van de Waals interaction between the surfaces in mutual contact.
  • this gas reaches and/or exceeds a threshold which depends on the force of adhesion between the flexible membrane 2 and the sheet 5 and between the flexible label 1 and the flexible membrane 2 - which in the case of an adhesive valve according to the present invention may also be 10 mbar or also 8 mbar - this gas penetrates between the sheet 5 and the flexible membrane 2; then, after passing over the edge of the latter or passing also through the incision 2c, the gas penetrates between the non-adherent portion 4 of the adhesive film 1 and the upper surface of the flexible membrane 2 until it reaches the incision lb which opens, venting externally, for example as can be seen in Figure 7b where the flow path of the gas is schematically indicated by means of a broken line arrow.
  • Figure 3 shows a variant of the adhesive valve 100 of Figure 2 which differs from the latter in that the two non-adherent portions 4 each have two narrow sections which extend towards the edge of the flexible membrane 2, reaching it or passing over it, and two parts which from a respective narrow section widen as far as the incision lb where they are joined together.
  • the adhesive valve 100 may comprise a first non-adherent portion 4a of the at least one non-adherent portion 4 and a second non-adherent portion 4b of the at least one non-adherent portion 4 where the first non-adherent portion 4a and the second non-adherent portion 4b are adjacent, but separated, namely, in plan view, spaced, preferably by a distance of between 0.1 mm and 10 mm, or may be connected, as shown in Figure 4b.
  • Figures la-ld and 4a and 4b show possible embodiments of the present invention showing two pairs of a first non-adherent portion 4a and a second non-adherent portion 4b.
  • the two non-adherent portions 4a and 4b may define two "lungs" which are crossed in succession by a gas which crosses the adhesive valve 100 so as to be discharged from a container which encloses it.
  • the first non-adherent portion 4a in plan view, may extend above the flexible membrane 2 and/or straddle a perimetral edge thereof and is not crossed by the incision lb of the flexible label 1.
  • the second non-adherent portion 4b in plan view, may extend above the flexible membrane 2 and as far as the incision lb of the flexible label 1 and may be crossed by the incision lb.
  • the second non-adherent portion 4b comprises a plurality of its parts, joined together, which, in plan view, extend towards the first non-adherent portion 4a, tapering towards the latter and widening away from it so as to define a plurality of diverging channels for the gas which is directed towards the incision lb and penetrates between the flexible membrane 2 and the second non-adherent portion 4b.
  • the adhesive valve 100 may comprise at least one third non-adherent portion 4c of the at least one non-adherent portion 4 which, in plan view, extends between:
  • this zone may coincide with the centre of the flexible membrane 2;
  • the third non-adherent portion 4c defines a preferential flow passage for gas between the flexible membrane 2, or an edge thereof, and the flexible label 1 towards the edge lc and/or the notch Id of the flexible label 1, so as to discharge this gas parallel to the extension of the flexible label 1.
  • the flexible membrane 2 may have at least one through-cut 2d which connects together the two surfaces so as to allow gas to pass through and/or has at least one channel which divides it at least partially.
  • the through-cut 2d and/or the channel extend between the zone of the flexible membrane 2 intended to cover an incision 5a of a sheet 5 to which the adhesive valve 100 is applicable, and the edge lc and/or notch Id of the flexible label 1.
  • the gas may be discharged in a direction transverse to the thickness of the adhesive valve 100 such that, when the containers which comprise it are stacked together and, therefore, the respective valves are covered by the wall of another container, they are in any case able to discharge gas across the edge lc and/or across the notch Id, thus making it possible to avoid the swelling effect which is not liked at all in the packaging of shelf products, such as the packaging of ground coffee.
  • FIGS 8, 9 and 10 show further variations of embodiment of the adhesive valve 100, according to the present invention.
  • the flexible label 1 may be annular, namely have a circular form, with an incision lb which follows a closed circle, in plan view, forming a circular opening which may be centred with respect to the perimeter of the said flexible label 1.
  • the non-adherent portion 4 in plan view, may extend in the manner of a circle around the incision lb, surrounding it and may have parts which extend, tapering, towards the incision lb itself, reaching it.
  • the perimeter of the non-adherent portion 4 remote from the incision lb may, in plan view, surround the perimeter of the flexible membrane 2 which, in plan view, is aligned with the incision lb so as to close it, except in order to discharge a gas from the inside of the package which comprises the adhesive valve 100.
  • the adhesive valve 100 may have a plurality of non-adherent portions 4, for example two first non-adherent portions 4a and two second non-adherent portions 4b, the first ones 4a of which extend straddling the edge of the flexible membrane 2, in plan view, and the second ones of which extend so as to be crossed by at least part of at least one incision lb of the flexible label 1.
  • the first non-adherent portions 4a and the second non-adherent portions 4b may be spaced apart and, between them, in plan view, at least one auxiliary incision 10b may be provided.
  • the first non-adherent portions 4a may form a series of lugs which extend towards the incisions lb where an auxiliary incision 10b may be provided between two lugs, and an incision 2c of the flexible membrane 2 may be provided in the region of at least one of the lugs.
  • the flexible label 2 may also have anti-tamper slits 6 which, for example, may be arranged in mutually opposite positions and be shaped so as to extend along a curved path and in particular circular or elliptical path so as to define, with their ends, a preferential initial -breakage portion of the flexible label 1, should it be removed from a sheet 5 onto which it may have been applied.
  • anti-tamper slits 6 which, for example, may be arranged in mutually opposite positions and be shaped so as to extend along a curved path and in particular circular or elliptical path so as to define, with their ends, a preferential initial -breakage portion of the flexible label 1, should it be removed from a sheet 5 onto which it may have been applied.
  • a sheet 5 designed to close or form a container for food products may have at least one incision 5a which connects the two surfaces of the sheet 5 covered by the adhesive valve 100 in order to seal the inside of the container, while allowing gas to be discharged therefrom.
  • the incision 5a in the sheet 5 may be straight, curved or closed, so that the portion of the sheet 5 surrounded by the incision 5a may be removed and form an opening, which is for example substantially circular.
  • the incision 5a in the sheet 5 may also be curved, so as to form a tongue-shaped portion which may bend towards the adhesive valve or the opposite side.
  • At least one layer of adhesive in particular of the PSA type, for example with a rectangular shape, may be arranged on a portion of the sheet 5 around the incision 5a in order to promote adhesion of the flexible label 1 to the sheet 5.
  • FIG. 5a may depict a plurality of incisions 5a, for example a group of closed incisions designed to form small openings, namely small holes, in a portion of the sheet 5.
  • the bottom surface la of the flexible label 1 may be joined together with the upper surface of the sheet 5 owing to the adhesive applied to the lower surface la so that the flexible membrane 2 is arranged between the flexible layer 1 and the sheet 5.
  • the flexible label 1 may adhere again to the flexible membrane 2, closing the gas flow passage between the sheet 5 and the flexible label 1, in particular owing to the elasticity of the materials and electrostatic forces and/or Van der Waals forces which are created between the flexible membrane 2 and the flexible label 1 and, in some cases, between the flexible membrane 2 and the sheet 5 if the said adhesive is not arranged between them.
  • a method for manufacturing an adhesive valve (100) according to the present invention in general has a particular feature in that it comprises the following operating steps:
  • step A realizing at least one non-adherent portion 4 on an adhesive surface of a first layer 14;
  • step B forming at least one incision lb passing through the first layer 14;
  • step C punching the first layer 14 around the non-adherent portion 4 and the incision lb to form the flexible layer 1 of the adhesive valve 100;
  • step D joining the first layer 14 to a support 3, with the non-adherent portion 4 arranged between the first layer 14 and the support 3;
  • step E punching the support 3 to form at least one flexible membrane 2 of the adhesive valve 100 in the support 3.
  • the first layer 14, the support 3 and/or the adhesive layer included between them may be continuous and uniform and may form a single strip.
  • the method may also comprise a step D of forming at least one incision 2c and/or at least one through-cut 2d through each flexible membrane 2 of the support 3.
  • the step B may also involve forming at least one notch Id passing through the first layer 14.
  • the method of manufacturing the adhesive valve 100 may therefore involve a strip 11 preferably wound onto a reel 12 being pulled, for example in the direction of the arrows shown in Figure 5, by one or more first auxiliary rollers 13.
  • the strip 11 may comprise a first layer 14 of suitable material for forming the aforementioned flexible labels 11, which may be joined by means of at least one adhesive layer to a support 3 of suitable material for forming the aforementioned flexible membranes 2.
  • the first layer 14, the support 3 and/or the adhesive layer included between them are preferably continuous and uniform and for example formed as strips.
  • a first of the auxiliary rollers 13 may separate the first layer 14 from the support 3, these being able to be pulled separately by other auxiliary rollers 13, for example as shown in Figure 5.
  • the first layer 14 of the strip 11 may be provided with a series of non-adherent portions 4 which may be arranged at regular distances one after the other on the adhesive surface of the first layer 14 which, with reference to the example shown in Figure 5, is directed upwards.
  • the series of non-adherent portions 4 may be arranged by an applicator 16 which, for example, applies and dries an anti-adhesive substance onto the non-adherent portions 4, for example a lacquer.
  • the first layer 14 may be provided with a series of incisions lb arranged at the same regular distances between the non-adherent portions 4, by a perforator device 20, for example a laser perforator, if necessary with the aid of a sensor 21 designed to detect the position of a non-adherent portion 4 on the first layer 14, so that the non-adherent portion 4 is crossed by the incision lb, viewing it in plan view.
  • a perforator device 20 for example a laser perforator
  • the incisions lb in the first layer 14 may also be formed before forming the non adherent portions 4.
  • the support 3 of the strip 11 may be joined to the first layer 14 by one or more second auxiliary rollers 23, with the non-adherent portions 4 arranged between the first layer 14 and the support 3.
  • the first layer 14 of the strip 11 may then be punched by a first mechanical punch, in particular a roller punch 24, so as to form in the first layer 14 a series of flexible labels 1 where the cut made by the punch may surround the non-adherent portions 4, being separated from these or also intersecting them if it is required to provide the possibility if venting gas, including through the side edge of the flexible label 1.
  • a first mechanical punch in particular a roller punch 24
  • the cut made by the punch may surround the non-adherent portions 4, being separated from these or also intersecting them if it is required to provide the possibility if venting gas, including through the side edge of the flexible label 1.
  • the material of the first layer 14 which is surplus with respect to the series of flexible labels 1 may be removed.
  • the support 3 of the strip 11 may be punched by a second mechanical punch, in particular a roller punch 25, so as to form in the support 3 a series of flexible membranes 2 which are each covered by a flexible label 1 with the non-adherent portion 4 arranged between them.
  • the strip 11 acts as a support for a series of adhesive valves 100 as described above, which are formed by a flexible label 1, a flexible membrane 2 and a non adherent portion 4 arranged between the flexible label 1 and the flexible membrane 2.
  • the strip 11 together with the adhesive valves 100, may be wound onto a reel 26.
  • a support membrane 6, preferably wound onto a reel 31, is pulled, for example by one or more first auxiliary rollers 32, following which a punch 33 forms the incisions 5a in the support membrane 6
  • an applicator 34 applies adhesive layers onto the support membrane 6 close to the incisions 5a, after which a labelling machine 35 applies adhesive valves 100, for example removing them from the strip 11, on top of the incisions 5a of the support membrane 6, with the lower surface 1 of the flexible label 1 in contact with the sheet 5 in the manner described above.
  • the sheet 5 may be removed from the reel 36 and cut to obtain a plurality of sections which comprise at least one adhesive valve 100 and may be used to form packaging for alimentary use, for example as a cover of a container in which the sheet portion 5 is joined to the edge of other sheet sections to form the container, in particular by means of adhesive or heat-welding.
  • an adhesive valve, a sheet which comprises said valve, a container which comprises said valve and a method for the manufacture thereof are able to perform the task and achieve the predefined objects.
  • a container which incorporates an adhesive valve according to the present invention is able to avoid the swelling or "puffing" effect which has a particularly negative effect on the appearance of the product.
  • the present adhesive valve allows gas to be discharged also at very low pressures, for example even at 8 mbar, and at speeds substantially higher than in the conventional solutions, namely even at 3 mbar/s.
  • the non-adherent portion has one or more parts which taper towards the edge of the flexible membrane and, vice versa, widen out towards the incision of the flexible label means that it is possible to form substantially funnel-like passages between the non-adherent portion and the flexible membrane, these preventing entry of the outside air, i.e. towards the inside of the sheet which supports the adhesive valve, while making venting towards the outside easier.
  • the non-adherent portion for example by applying a glue killer in a single step, defining therefore the form and the size of the non-adherent portion as well as the number of non-adherent portions to be obtained.
  • the non-adherent portion or non-adherent portions may be obtained by means of a single pressing plate (for example in a so-called "flexo" printing system), thus avoiding the need for pressing to be subject to strict tolerance constraints, as in the case of the conventional solutions. This ensures a greater precision during production as well as a reduction in the production complexity and increase in productivity.
  • an adhesive valve according to the present invention it is possible to obtain the discharging of gases inside the package also at pressure values below the 20 mbar of conventional valves and, especially, of the order of 10 mbar and preferably even as low as 8 mbar, obtaining moreover high gas discharging speeds, namely substantially higher than 0.5 mbar/s, i.e. of the order of mbar/s and even about 3 mbar/s.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Making Paper Articles (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Valve adhésive (100) comprenant au moins une étiquette souple (1) qui présente deux surfaces, au moins la surface inférieure (la) comprenant un adhésif et au moins une incision (1b) reliant les deux surfaces, la surface inférieure (la) de l'étiquette souple (1) comprenant au moins une partie non adhérente (4) au moins partiellement superposée à l'incision (1b). La présente invention concerne également une feuille et un récipient pour des produits alimentaires comprenant ladite valve adhésive (100) ainsi qu'un procédé de fabrication de la valve adhésive (100) ou de la feuille.
EP21734202.1A 2020-05-04 2021-04-30 Valve adhésive, feuille et emballage pour des produits alimentaires et procédé de production de ladite valve adhésive et de ladite feuille Active EP4146559B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000009742A IT202000009742A1 (it) 2020-05-04 2020-05-04 Valvola adesiva, foglio e contenitore per alimenti, nonché procedimento per fabbricare questa valvola adesiva o foglio
PCT/IB2021/053611 WO2021224737A1 (fr) 2020-05-04 2021-04-30 Valve adhésive, feuille et emballage pour des produits alimentaires et procédé de production de ladite valve adhésive et de ladite feuille

Publications (3)

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EP4146559A1 true EP4146559A1 (fr) 2023-03-15
EP4146559B1 EP4146559B1 (fr) 2025-06-04
EP4146559C0 EP4146559C0 (fr) 2025-06-04

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EP21734202.1A Active EP4146559B1 (fr) 2020-05-04 2021-04-30 Valve adhésive, feuille et emballage pour des produits alimentaires et procédé de production de ladite valve adhésive et de ladite feuille

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EP (1) EP4146559B1 (fr)
IT (1) IT202000009742A1 (fr)
WO (1) WO2021224737A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR046175A1 (es) 2004-10-07 2005-11-30 Celomat S A Una valvula unidireccional liberadora de presion aplicable a un envase que contiene un producto que emite gases, en la que coexisten un medio fluido y una burbuja de aire, y un envase que incluye a dicha valvula
US7837387B2 (en) * 2005-04-06 2010-11-23 Avery Dennison Corporation Evacuatable container
IT1394911B1 (it) 2009-07-09 2012-07-20 Masterpack S P A Procedimento di fabbricazione di etichette-valvola adesive flessibili
ITMI20140037U1 (it) 2014-01-27 2015-07-27 Masterpack S P A Etichette-valvola autoadesive
FR3040083B1 (fr) * 2015-08-14 2018-02-02 Centre National D'etudes Spatiales Soupape de securite pour enveloppe gonflable
WO2019077536A1 (fr) 2017-10-20 2019-04-25 Masterpack S.P.A. Valve adhésive, feuille et récipient alimentaire, support ainsi que procédé de fabrication de cette valve adhésive

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Publication number Publication date
WO2021224737A1 (fr) 2021-11-11
IT202000009742A1 (it) 2021-11-04
EP4146559B1 (fr) 2025-06-04
EP4146559C0 (fr) 2025-06-04

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