IT202100003821U1 - ADAPTABLE AND RE-SEALABLE PAPER BAG FOR WASTE - Google Patents

Description

ADAPTABLE AND RE-SEALABLE PAPER BAG FOR WASTE

[0001] The present invention relates to an adaptable and resealable paper waste bag.

Field of application

[0002] The innovation finds its destination in the sector of production and marketing of paper bags for the differentiated collection of urban waste. In particular, the invention improves the collection of paper waste and wet waste in residential and domestic environments, or in offices, being easily adaptable to the container used and being also resealable once filled, to be transported and sent in its entirety to the recycling plants and /or disposal and/or pulping.

[0003] In the state of the art, paper bags for food use shaped like a flattened but expandable envelope are widely known and widespread, as they originate from a single punched and folded sheet of paper with opposite side gussets, which? welded on one side and on the bottom; such a lot configuration ? otherwise called bread bag or flat bottom bag, or even open mouth bag. Apparatuses for automatically producing this type of paper sack are also known and widespread, and are generally called roll bagging machines and are suitable for continuously producing flat-bottomed paper sacks, with or without side gussets. It is therefore noted that in production ? It is possible to change the dimensions of the bag and the relative gussets, by modifying the cutting profile and/or the setting of the parameters relating to length and format.

[0004] Furthermore, ? It is also known that this paper bag making equipment can be fed online from a four or more flexographic printer? colors, to get the bag finished and down? superficially equipped with the usual graphic completion, further reducing the cost of the product. Such a result can be obtained by cyclically coordinating the printing with the various bag construction operations, such as die-cutting, bellows forming, tearing and gluing welding. Basically, once the pitch has been adjusted, the aforesaid coordinated equipment continues to reproduce the finished product, ready for packaging, as it is until further modifications are made. All of that? considered, it can be considered known and available the various technologies needed to produce industrially in an economic and convenient way paper bags shaped like an expandable envelope, with side gussets and flat bottom, and which are also equipped with an explanatory surface graphic and/or decorative.

[0005] In the specific sector of sacks for the collection of domestic or urban waste, some solutions of sacks made of paper are also known, having an envelope configuration of the type described above; for example, are already? note some specific paper bags for the collection of paper waste or paper bags suitable for wet waste.

State of art

[0006] In order to determine the state of the art relating to the proposed solution and in particular among the improved solutions of paper bags for the differentiated collection of domestic waste, ? A conventional verification was carried out, interrogating public archives, which led to the identification of some precedents, including:

Q1: DE4303341A1

Q2: FR1590585A

Q3: EP1762510

Q4: WO8809752A1

Q5: JP4394818B2

[0007] D1 proposes a paper bag for the collection of composting materials, with two flat sides and double side gussets, which? formed by two layers of paper unrolled from reels, then folded and glued together on the sides and bottom. The bag must be inserted in a particular support container which integrates an integrated fastening means in the form of a lid hinged from above; to this end every lot ? equipped with two flaps having a reinforcing core in metal wire, which protrude from the flat sides in correspondence with the opening to be supported and blocked by the aforementioned container.

[0008] D2 describes a domestic waste storage system including a particular closable bag, which is temporarily fixed to a containment structure equipped with a lid, inclined bottom and hooking means; the bag has a shape combined with said structure and has one or two protruding flaps which also act as closure means by adhesion, integrating adhesive tape. At the moment of unloading, the bag closed and filled with waste has a shape and dimensions compatible with the standardized ducts for the centralized collection of waste which are present in collective buildings, of the chute or fall type; in particular, the closed bag slides inside them without jamming or opening, facilitating the final collection without waste spilling.

[0009] D3 proposes a bag for the collection of wet-type household waste, which ? equipped with one or more Foldable upper flaps that protrude from the opening edge of the bag and correspond on the bottom to as many lower flaps having a complementary shape to facilitate cutting in production and form a reinforced bottom, once superimposed and glued. The bag ? obtained from a blank of rigid or semi-rigid paper, having a cut profile with steps which form said protruding upper flaps with different lengths; in particular, a sack in the shape of a parallelepiped and a rectangular base is proposed, where the upper flaps which protrude from the side walls have a greater height than the flap which protrudes from the front wall. The bag can be housed inside a special bin, with the side flaps and a front flap folded over a rigid lip that protrudes from the upper edge of the bin, in such a way as to engage with it being blocked from above by a special element perimetric fixation unit that closes the edge of the bin from above, like an integrated frame, and holds the bag in the position of use.

[0010] D4 describes a paper bag with four small flaps which protrude laterally from the opening edge and prevent the bag from slipping inside the container where it? inserted during use. In particular, the bag ? equipped with a rectangular bottom closed with double bellows that opens completely only during extraction from the container, with the bag filled, after the humidity? Has it dissolved the temporary fixing adhesive and the material contained? fell, stretching cos? the bag. Therefore, with the extraction, space is freed up at the opening so as to have enough material to close the end. top, rolling it up like a handle.

[0011] Furthermore, it should be noted that D5 offers a sack for the orderly collection of paper newspapers and magazines to be pulped, of the type with a rectangular bottom and two opposite sides folded into bellows, made from a welded multilayer film; on each lateral face of a sack placed vertically in the position of use, there are four series of full-height perforations, which therefore start from the upper edge in correspondence with the opening and arrive at the lower edge near the opening. of the fund. Once the sack ? filled, it can be cut along said vertical perforations in such a way as to remove the corner portions and obtain four long and narrow portions separated from each other and joined at the bottom like cross-shaped ribbons, one for each lateral face, which serve to bind the newspapers and magazines already collected and stacked inside.

[0012] Ultimately? therefore it is reasonable to consider a waste paper sack to be known and conventional equipped with means for anchoring to the opening edge of a rigid container consisting of flaps that protrude upwards from the mouth edge of the sack, otherwise called protruding flaps, to fold back to the container. outside and engage on said edge of? opening thus hindering? the bag's natural tendency to slide inwards. These flaps or flaps of the bag are generally blocked in the position of use by an element integrated in the container itself in the manner of a lid or a frame.

Drawbacks

[0013] The solutions just mentioned Q1 ? D4 allow you to combine a waste paper bag with a rigid support container, keeping it vertical and open in the position of use; However, ? operators in the sector know that they have certain disadvantages.

[0014] In principle, the conventional solutions provide for gripping flaps which protrude from the opening edge, to fold outwards and engage with said container, which have a fixed height determined by the cutting profile or by the protrusion with respect to the opening profile of the bag; it follows that the bag is inserted and effectively integrated only in containers dedicated to it or of a corresponding shape and height. Merely as an example, if the bag is placed in any container for domestic waste, it can verify that said flaps or flaps do not cling to the edge of the container if it is shorter than the bag; conversely, they could bend or yield not being able to support the weight of the contents if the said height of the container? higher than that of the bag, which therefore does not rest on the bottom.

[0015] Basically, yes? noted that the conventional and known solutions of paper bags for waste of the type with fixed profile protruding flaps, of which for example in D1 ? D3, are effectively adapted only to standardized containers corresponding to them but are not adapted to most of the containers which are generally used in the residential or domestic environment, which have various shapes and various heights being generally non-uniform or of casual use.

[0016] Also, yes? noted that the above conventional and known solutions of paper sacks for waste with fixed profile protruding flaps provide for a container which ? also equipped with a specific blocking element of the same flaps, like a lid or frame complementary to the opening edge of the container and able to firmly stop the bag in the position of use, thus avoiding unwanted slipping or shifting; ? well known, in fact, that such movements make the introduction of waste uncomfortable and not very hygienic and can also cause a partial leakage of the material already introduced. Consequently, the aforementioned known solutions of bags with fixed profile protruding flaps or flaps require a dedicated support system consisting of a custom-made container combined with the bag, which is in turn equipped with a specific means of blocking the turned-up flaps. All of that? having said that, it is believed that bags with fixed profile protruding flaps or flaps are not very versatile in residential or domestic use since they? do not adapt to multiple configurations and / or heights of containers generally used and also why? require specific locking frames.

[0017] Another limitation, in the opinion of the applicant, yes? found in the known solutions of paper bags with a flat bottom and folded on itself? itself, in the form of a double gusset, to make the bag extendable on the bottom once it has been removed from the container and therefore resealable by rolling up the upper portion released, as for example occurs in the bag for wet waste referred to in D4; in particular, yes ? noticed that a flat bottom cos? folded ? reinforced and more resistant but involves a high thickness and ? bulky and awkward, for the purposes of the present invention, being not very flexible and scarcely adaptable. Furthermore, D4 envisages that said bottom is held in the folded position thanks to an adhesive which must dissolve upon contact with the water contained in the wet portion of the collected waste; however, this does not occur in the case of the aforementioned dry paper-type waste, which is also light, so the thrust given by the natural gravity? could be insufficient and the fund would remain folded on s? same. In this case, in order to close the full bag again, it is necessary to perform an awkward and unhygienic manual operation, such as for example pushing the contents downwards, with the consequent risk of tearing the bag if the adhesive does not yield.

[0018] Yes? therefore noted that in the sack of which in D4 and in other known solutions, there are protruding flaps having a fixed profile and contained dimensions, so that they fit with difficulty? to containers or bins of non-corresponding height and/or shape. Pi? general, in the practical use of the paper bags have problems of compatibility been encountered? between the shape of the bag and that of the container, such as a common bin or waste basket, in cases where the latter has excessive dimensions so that the protruding flaps of the bag, once folded outwards like gripping flaps, are they not large enough to go beyond the edge of the container and allow the application of a blocking means, such as for example the said frame or lid referred to in D1 ? Q3. By contrast, ? it is also known that gripping flaps or protruding flaps whose dimensions are too large compared to the height of the container would leave side portions of the bag open due to the shorter cutting profile. deep compared to the opening, and therefore partially inside the container.

[0019] In the practical use of the aforementioned bags, where the dimensions of the bag and its attachment flaps do not correspond exactly to those of the container and its opening, it can the unpleasant leakage of the waste occurs during the extraction or transport of a full bag, through said laterally too deep cut profile; or, in the opposite case, bulky excess portions of said fins can remain outside, so that ? necessary to adjust the height manually with occasional or non-guided tears which sometimes cause excessive lacerations or breakage of the fins themselves. ? then it is noted that the adaptations of the bag, if not guided or not facilitated, often lead to unsatisfactory results and also require time and attention on the part of the user.

[0020] Furthermore, it is noted that the bag envisaged by D5 ? equipped with apparently similar perforations to those provided by the present invention; however, they have completely different purposes and have a different embodiment. The perforated lines of D5 extend from the opening edge to the bottom of the bag, i.e. they are full length, in order to dismember the bag after its filling, tearing and removing entire corner portions to obtain four long thin ribbons arranged in a cross to be used as a means of final binding of the content. In particular, in D5 there are no elements for retaining and/or attaching the bag to a container, this being substantially superfluous and not envisaged since the proposed bag is not? intended for the collection of loose paper waste, as in the present invention, but ? specific for temporarily containing newspapers and/or magazines stacked in an orderly manner and then tying them like a package.

[0021] All of that? considered, ? reasonable the need? of companies in the sector to identify innovative solutions capable of overcoming at least the problems just identified and achieving the set goals.

Summary of the invention

[0022] These and other objects are achieved with the present innovation according to the characteristics set forth in the appended claims, solving the problems described by means of an innovative paper bag (10a, 10b) for the collection of paper or wet waste, which? easily adaptable to the container used (20) and effectively resealable once filled. It comprises longitudinal perforated lines (106) which delimit retaining means (105a, 105b) integrated in the side walls of an intact bag, which are adjustable as required. by manual tear guided along said perforated lines made up of aligned holes (108), an initial guide (109) and at least two intermediate slots and a terminal slot (110a - 110b, 111a - 111c) to divide the tear into modular intervals . Optionally transversal perforated lines (10b, 107) are included which cross said slots in the form of a perforated grid, to shorten the bag and/or the retaining means in a coordinated and modular way. The bag ? printable with visible graphics (118) and packaged like a pack, closed by an elastic ring as a multifunctional accessory (119, 120a - 120b).

Purposes

[0023] Various purposes are achieved through the considerable creative contribution, the effect of which constitutes an immediate technical progress.

[0024] A first advantageous aim? was to create a paper bag for paper or wet waste, of the resealable and fully recyclable type, being transferable together with its content, which? very versatile having the mouth at an adjustable height according to the container or bin available, without the need to d? a specific container. The proposed bag adapts from time to time to the container used, locking itself in the best position of use; to this end, it integrates particular adjustable retention means described in detail below. Basically, the user can easily adjust the useful height of the bag, i.e. the distance of the mouth from the bottom, simultaneously obtaining from the side walls of the same bag retaining means able to engage with the opening edge of the container used , such as a conventional bin of lower height than the bag, to be blocked there until it is completely filled and then also used to close it, remove it and transport it manually.

[0025] A second advantageous purpose? was to create a paper bag for waste that can be manually adapted in a rapid, guided and intuitive way. It has a constructive configuration which allows the initial operations of adjustment and adaptation of the bag to the container to be performed without tools and with precision, as well as the final closing and extraction operations. For blocking the bag on the edge of the container ? usable an elastic element combined with the sales package, as a multipurpose accessory.

[0026] A third advantageous aim? The aim was to integrate retaining means which are also adapted from time to time to the width of the available container, being turned over in adherence with a large portion exceeding the opening edge of the container itself. This excess portion? also useful to be blocked laterally by an external elastic ring of simple configuration, for example the one included in the sales package or any conventional elastic ring having suitable dimensions. The aforementioned excess portion of the flap ? then also useful at the end of the use of the bag, as explained below.

[0027] A fourth advantageous aim, in fact, is was to integrate adjustable and multipurpose retention means, and also differentiated in function. For example, two of them in the closing phase of a full bag can be folded inwards to prevent the contents from escaping laterally, while the other two can be overlapped and rolled up together to seal the bag and also form a handle.

[0028] A fifth purpose, ? was to create a waste paper bag that could be packaged in an advantageous and pleasing way to look at. Therefore a substantially rectangular sack is proposed, devoid of the conventional grip flaps protruding from the edge, being equipped with particular retaining means integrated in the side walls. The bag can be printed with decorative and/or explanatory graphics, and can? be stacked on top of each other and folded en bloc, forming a low-cost sales package and without packaging and/or superfluous elements that already? integrates the necessary commercial information on the external face, like a pack of folded newspapers. It is combined with a closing element that acts as a reusable and multifunctional accessory.

[0029] Still a goal? attributable to the fact of making an extremely versatile and comfortable paper sack in residential and domestic use, which effectively achieves all the intended purposes, and which is also ? cheap and easy to produce with automatic equipment.

[0030] A further advantageous object, consequent to the previous objects, is was to propose an improved paper sack that favors the differentiated collection of waste, both paper and wet, and their disposal, also increasing cleanliness and hygiene, and reducing environmental pollution.

[0031] These and other advantages will appear from the following detailed description of some preferential embodiments, with the help of the attached schematic drawings, the execution details of which are not to be understood as limiting but merely as examples.

Drawing content

Figure 1 ? an axonometric view of the adaptable and resealable paper waste bag, which is? object of the present invention; in the figure ? represented the basic version of the bag, equipped with particular longitudinal perforated lines that separate integrated retention means.

Figure 2 ? an axonometric view of the same paper bag shown in Fig. 1, where two hands are schematically represented in the act of separating the integrated retaining means, performing a guided tear along the longitudinal perforated lines.

Figure 3 ? an orthogonal plan view of the sheet of punched paper which corresponds to the paper sack of Fig. 1, where the cutting profile, the fold lines and the longitudinal perforated lines are schematically represented, which are indicated with an arrow.

Figures 4a - 4b are detailed details relating to a longitudinal perforated line, as envisaged by the present invention. Respectively, Fig.4a ? an enlarged detail of the hatched area D1 of the previous fig. 3, including some embodiment variations of the slots; Fig.4b, however, ? a longitudinal section at the plane of section X ? X of Fig.4a. Figure 5 ? an orthogonal plan view of the sheet of punched paper shown in Fig. 3, to which further perforated lines have been added in the transversal direction, in correspondence with the intermediate and end slots.

Figure 6 ? an axonometric view of the paper bag for waste according to the present invention, in an evolved version which corresponds to the sheet of punched paper shown in the previous Fig. 5, where the addition of transversal perforated lines allows to shorten the means of modular bands retention integrated already? provided for in the basic version shown in Figs. 1 and 3.

Figures 7a - 7b are schematic representations of the preferred mode of use of the proposed bag, sequentially divided into eight phases (F1 ? F8) from the initial adaptation of an intact bag to the used container, with guided and regulated separation of the integrated retaining means , until the full bag is closed and extracted; it is noted that the two figures (Fig. 7a - 7b) are to be considered united and consequential, being graphically subdivided only to improve understanding.

Figures 8a - 8b are axonometric overall views relating to a packaging for the transport and sale of paper bags, as envisaged by the present invention, in a first embodiment with one fold and double ring. Multiple equal sacks are stacked one on top of the other and folded together transversely once, like a package, and then closed by two cross-over multi-purpose elastic rings. Respectively, Fig. 8a schematically illustrates this package where the perforated lines delimiting the integrated retention means are highlighted in the visible portion of the external bag; Fig. 8b represents the same package where in the bag more? external ? visible decorative graphics.

Figure 9 ? a side view of the multifunction elastic ring provided by the present invention.

Figure 10 ? a three-dimensional view of the whole relating to an anti? break-in for the transport and sale of paper bags, as envisaged by the present invention, in a second optimized compact pack version with double transversal fold, a single multifunctional elastic ring which also prevents lateral extraction of the bags, and with a? paper sealing label. In the bag more outside of this package? visible decorative graphics.

Practical realization of the invention

[0032] With reference also to the enclosed figures (Figs.1 - 10), the object of the present invention relates to an innovative paper bag (10a, 10b) which can be resealed and adapted for the collection of residential, domestic or even office waste; it ? more advantageous in the specific case of dry waste of the paper type, being resealable and fully transferable to paper pulping and/or recycling plants. In particular, the bag proposed (10a, 10b) ? from time to time adaptable to the container used; it is noted that ? suitable for the proposed bag is any bin or waste bin with top opening and compatible dimensions, where the height of the bin is ? lower than that of an intact bag in such a way as to be bound to it as described below.

[0033] The proposed sack comprises retaining means (105a, 105b) able to lock precisely and effectively to the opening (201) of the container (20) used; in particular, these retaining means are integrated and adjustable, being obtainable according to need? from the structure of the bag itself, according to the shape and/or dimensions of the container used. Before use, they are fully integrated, included within the side walls (103, 104) of an intact bag (Figs. 1, 6) near the of the mouth edge (113a), being delimited on the sides by longitudinal perforated lines (106) and parallel to each other; therefore, to use the bag in practice, said integrated retaining means must be separated from the user by means of an easy and quick guided manual tear (Fig. 2) along said longitudinal perforated lines (106), so such as to obtain in each wall (103, 104) edges of? extremity? flaps of adequate size to easily adapt and tie the empty bag to the container actually used and then also to close the full bag and transport it in complete safety (Figs.7a - 7b).

[0034] Basically, the said longitudinal perforated lines (106) act as a pre? cuts adjustable in length, with also predefined or coordinated intervals in all the longitudinal perforated lines of the same bag. Pi? in detail, a longitudinal perforated line (106) ? composed of aligned through holes (108), with an initial invitation on the mouth edge (113a) in the form of a clean cut to start the tear correctly; to make the effective length of the tear effectively adjustable and modular, said perforated lines also comprise through slots (110a - 110b, 111a -111c) which divide the entire tear path into modular sections, being placed at predefined or coordinated intervals in all the perforated lines of the same bag, and thus acting as programmed stop notches (Figs.2, 4). In each longitudinal perforated line (106) at least two intermediate slots (110a, 110b) and one terminal slot (111a, 111b, 111c) are provided, which has a protective function at the end? tear or anti? laceration. In a sack, said longitudinal perforated lines (106) start from the upper edge (113a) and do not reach the bottom (102); they are positioned at least in correspondence with all the longitudinal folds (116) of the corner between the flat side walls (103) and the bellows ones (104), or in the so-called crease lines of the bellows, thus facilitating the the turning of the upper band in all the walls of the sack. For more convenience? For adaptation to non-parallelepiped containers, such as for example in the case of traditional cylindrical baskets, further longitudinal perforated lines can be interposed in the walls of the bag (Figs. 1, 3, 5, 6). Generally, there are at least four longitudinal perforated lines (106), or six or eight lines in a sack.

[0035] Said aligned holes (108) have dimensions and center distances such as to allow easy manual tearing, without altering the structural consistency of the bag; these dimensions and center distance of the holes, therefore, are determined according to the thickness, weight and composition of the paper used. In general, for the bag proposed (10a, 10b) ? fit a paper of the Kraft type; however, it can contain substances of other nature aimed at improving its performance and/or producibility. In particular, the paper used must be stickable and printable, and must have a thickness between 0.05 mm and 0.75 mm, with a weight between 40 g/m2 and 90 g/m2; Yes ? experimentally found that such a paper, if inclusive of long fibers, ? also capable of containing waste with sharp edges, without tearing, while ensuring sufficiently easy manual tearing along said perforated lines (106, 107, 108).

[0036] More in the technical detail of said paper, for the purposes of the invention ? fit a paper having a longitudinal breaking load that ? between 0.5 kN/m and 9.5 kN/m, according to the ISO 1924-1/2 standard, and with a transversal breaking load that ? between 0.5 kN/m and 9.5 kN/m, according to the said ISO 1924-1/2 standard. Furthermore, it must have a resistance to bursting, according to the ISO 2758 standard, which is ? between 50 kPa and 450 kPa. This card? it can therefore be used in sheets from reels, for the continuous production of the proposed sack, for example by means of an automatic apparatus of the said rotary sack machine type where the said reel has a width between 500 mm and 1200 mm.

[0037] More in the manufacturing detail of a perforated line (106, 107), using a paper of these characteristics, there are aligned through holes (108), of small dimensions and of an approximately rectangular or circular shape, for example semi-round; the encumbrance of a single hole (108) ? between 0.1 mm and 5 mm both in the longitudinal (116) and transverse (117) directions, depending for example on the size of the bag, its thickness and/or its weight. They are longitudinally aligned at an interval distance between 0.1 mm and 5 mm, this distance being preferably regular; However, ? It is possible to provide for variable distances in order to diversify the manual tearing effect. It is noted in this regard that the? intensity? of the effect of pre - cutting, and therefore the size and/or diameter of the holes and their center distance, ? easily adjustable as needed. With the aforementioned manufacturing characteristics and maintaining an adequate distance between the perforated lines, precise and rapid manual tearing is ensured in all conditions of use, without interfering with nearby tears.

[0038] Each longitudinal perforated line (106, 108) has its origin from the top? of the sack (10a, 10b), starting from the upper edge of the mouth (113a) with the aforementioned initial invitation (109), which ? a clean through cut having the function of starting the tear correctly along the longitudinal trajectory (116) of the aligned holes (108). The invitation (109) has a length between 5 mm and 50 mm, proportionally according to the dimensions of the bag and its mouth (10a, 10b, 101), with a possible tolerance between one invitation and the other, in the same lot, equal to +/- 30%. Preferably, it has a linear shape in the form of a straight cut (Fig. 4a); However ? fits any shape equivalent in purpose, such as a hole or a slot.

[0039] More in detail, however, of said intermediate slots (110a, 110b) and terminal slots (111a, 111b, 111c), they are aligned and positioned in a regular manner at a distance of at least 20 mm from each other, presenting any shape and guidance suitable for the intended purpose. The intermediate slots can be larger holes with an elongated shape, for example elliptical (110a, 111a), or they can be clean and thin cuts (110b, 111b); the terminal slot, moreover, can? have a specific and/or combined shape to prevent the tear from extending as, for example, by combining a clean cut with a large circular hole at the end of the perforated path (111c). These slots have a length in the longitudinal direction (116) which ? between 5 mm and 50 mm, while in the transverse direction (117) they have a width which ? between 0.1 mm and 50 mm, where the minimum size ? referring to a clean and thin cut.

[0040] Such a configuration of perforated lines considerably facilitates the manual operations for adapting the bag to the container and also the effectiveness of containment. For example, if the container ? up and the user rips (106, 108, 109) up to the first intermediate slot (110a -110b), the underlying perforated line prevents the contents from falling out in any case; if the container was more? low, the user can? continue with the tear up to the next intermediate slot or up to the terminal slot (111a - 111c), definitively stopping the tearing path and preventing, even the most? clumsy, to tear and/or tear excessively the entire bag making it unusable. Once the height of the bag (113b) has been adjusted according to the actual depth? of container (20, F1, F2), ? therefore it is possible to turn the retaining means outward along its external surfaces so? separated (105a, 105b, F4).

[0041] An integrated retention means (105a, 105b)? laterally delimited by two longitudinal perforated lines (106) which are equal to each other at least from the first intermediate slot onwards, therefore? has a height in the longitudinal direction (116) that ? variable being at most corresponding to the total length of said perforated lines, considered from the initial invitation to the terminal slot (109, 111a - 111b, 113a); this characteristic ? evident in an intact bag (10b, 10b), before adaptation to the container used (20) (Figs 1, 2, 3). In the configuration of use, on the other hand, the aforesaid retention means (105a, 105b) ? partially separated and has an effective height which corresponds to the torn and foldable portion beyond the? of the edge of the container, like a flap joined to the base and obtained as needed? separating by means of a guided manual tear (Figs.2, 7a) the upper portion of the side walls of the bag (103, 104, 106). The constructive configuration of said perforated lines (106, 108? 111) makes the manual separation of said retaining means (105a, 105b) easy and precise, adjusting their height in a coordinated way, where the tear is ? modular on intermediate slots (110a, 110b) or ? entirely executable up to the terminal slot (111a - 111c). However, ? it is also possible to use said intermediate buttonholes only as a coordinated reference in the form of equal modular notches throughout the sack, to possibly extend the tear as desired but with less precision in the effective length.

[0042] The proposed paper bag (10a, 10b) can be made in a basic version (10a), which includes said longitudinal perforated lines (106) suitable for separating and longitudinally adjusting (116) said retaining means (105a, F2) (Figs, 2, 3, 7a); it also can be made in an evolved version (10b) which also includes transversal perforated lines (107) parallel to each other, which allow the retention means (105b) to be shortened in a coordinated and uniform way, according to modular bands (114a - 114c, F3) ( Figs. 5, 7a). These transversal perforated lines (107) are formed by the same aligned holes (108) described above, and are spaced longitudinally from each other at a distance coinciding with said intermediate slots (110a, 110b) and the terminal slots (111a, 111b, 111c), in such a way as to cross with the aforementioned longitudinal perforated lines (106) forming an orthogonal perforated grid where at each intersection there is an interruption of the tear that regulates the separations and/or the shortenings in a modular and coordinated way.

[0043] Basically, said perforated lines (106, 107) simultaneously perform multiple functions, ensuring greater versatility? and adaptability? of the bag to the depth? of the container used (20, F1 ? F3), with respect to the protruding fins of the known type, with a fixed profile. Particularly, are the retention means (105a, 105b) obtainable according to necessity? in a guided and coordinated way by the longitudinal perforated lines (106), offering a large revolving surface (F4) commensurate with the opening of the container (20, 201); before filling, this facilitates blocking of the bag from the outside and its filling up to the edge of the mouth (113b, 119, 201, F5), and then allows effective closure (F6 ? F8). In fact, the same retaining means turned upside down can then be folded inside in the form of large flaps, capable of overlapping and crossing each other and completely covering the mouth of the full bag, sealing its contents with a containing effect (F6). In this way, any spills from the sides of the collected material are prevented since the material is collected. said retaining means (106, F2, F4) form flaps to size, without lateral slots. Furthermore, the same retaining means folded inside are closure flaps opposite each other in pairs, where the two upper flaps can be jointly rolled up and/or curled to create a comfortable carrying handle and effective closure, such as? already known in paper bags for bread (F7, F8). In addition, the possibly present transverse perforated lines (107) (10b) allow said retention means (105b, F3) to be shortened in a coordinated manner in order to avoid, if necessary, the end portions of in excess; such a trick can? be useful in cases where the container available has a height significantly lower than that of the bag.

[0044] For the purposes of final closing and sealing of a bag (10a, 10b, F6 -F7), therefore, it is envisaged that the length of said longitudinal perforated lines (106) is greater than half the width of the opening (101), which corresponds approximately to the width of the flat wall (104); this reference, considered with a tolerance of /- 30% according to the fact that the lower pair of flaps opposed and folded inside have the function of containment, while others the upper pair must be more? long to roll up together, closing the bag like a carrying handle.

[0045] It is noted that in a bag (10b) all the transverse perforated lines (107) are at the same height, being spaced out in such a way as to intersect the various intermediate and end through slots (110a - 110b, 111a - 111c) of the lines longitudinal perforated (106), forming a perforated lattice of pre ? cut that guarantees the user high freedom, precision and speed? execution in the adaptation of the bag to the container (F1, F2, F3, F4) (Fig. 7a). Such an arrangement of crossed perforated lines (106, 107) ? also useful in the event that the height of the bag greatly exceeds that of the container used, so that the retaining means (105b) adapted to its opening edge have at the end an excess portion that exceeds the actual needs? d?anchoring and closing; then, ? it is advantageous to tear entire transverse portions (117) from an intact bag (10b) following said transverse perforated lines (107). This transverse separation or shortening of the bag can? be easily performed before separating said retaining means (105b) along the longitudinal perforated lines (106), or after it.

[0046] The proposed paper bag (10a, 10b) looks like an intact bag shaped like a bag for bread (101, 102, 103, 104) of large dimensions with the opening edge (113a) without protrusions, and with perforated lines (106, 107) able to delimit and separate said retaining means (105a, 105b). In order to insert and fix it in the container (20), the bag (10a, 10b) must first be adapted (105a - 105b, F1 ? F4) and then it must be blocked in the correct position for use (F5); then, after filling, it pu? be closed effectively and safely, facilitating extraction and transport (F6 ? F8). To contextually allow these operations, it has integrated retaining means (105a - 105b, 106, 107) which can be separated and adjusted in an easy and modular way, according to need. Once separated and positioned (F4), they appear as turned-up flaps having a greater width than known and conventional solutions, descending in adherence along the external surfaces of any available and compatible container (20), with effective grip temporary, keeping the empty bag upright. In this setup? therefore it is possible to apply externally from above, with both hands, locking means of the elastic type. In particular, ? fits the? application of one or more? elastic rings (119) in natural or synthetic rubber, or in an equivalent known material having a high degree of elasticity.

[0047] The elastic ring (119) used must support an extension such as to be applied from the outside, around the opening of the container (201), on said retaining means (105a, 105b) turned downwards, and also such as to shrink when ? released to block the bag and keep it firmly in the correct position of use, preventing movement and/or slipping. The snap ring (119) therefore has dimensions and elasticity? proportionate to the size of the bag, and therefore of the container; it can have a thin width or even more? wide, like a band.

[0048] For the purposes of the invention, a paper bag (10a, 10b) is proposed advantageously equipped with a particular multifunctional elastic ring (119), which is not? integrated in the constructive structure of the bag itself and not even in that of the container, being attached to the sales package of said bag as a more reusable external accessory? times and for different purposes (Fig. 7b, 9). In fact, an elastic ring (119) is envisaged which can be used both to close a bundle of intact bags (Fig. 8a) before using them, also with an anti? break-in to prevent the extraction of individual bags from a packed package (Fig. 10), and to block a bag on the opening of the container, in the correct position for use as described above (F5). Basically, the same circlip (119) ? the closure means of a package of intact bags (120a, 120b), for the purposes of transport and marketing, and also ? the locking means attaches a single bag of said package (10a, 10b, 120a, 120b) to the container (20).

[0049] Due to its various functions, said elastic ring (119) must have a perimeter development when at rest proportionate to the dimensions of a single bag and of a package (120a, 120b) of stacked and folded intact bags, considered at least in one (117) or both (116, 117) application directions (Figs. 7b, 8a, 8b, 9, 10). The perimeter development of said elastic ring (119), therefore, must be equal to approximately twice the width of a flattened bag and/or its height, considering a tolerance of /-30% depending on the two directions of application ; in fact, the ring (119) can? be applied to the package only lengthwise or only transversely (120b) or with a double crossed application (120a) with possibly two different extensions. It should be noted that the same elastic ring must then guarantee, in traction, a development suitable for the mouth of the bag (F5); ? therefore, at least one ring sized for transversal use is required (117). Regarding its height, it must be between 0.5 mm and 150 mm.

[0050] The bag proposed (10a, 10b) can? be superficially provided with decorative and/or explanatory graphics (118) of use, printed with a known technique on at least one of its flat walls (104). It is noted that this printed wall also constitutes the most? external and visible of a package of bags (120a, 120b), where a plurality? of intact sacks are stacked one on top of the other and folded together in the shape of a package, clearly showing said graphics (118) integrated as ? required for commercial purposes (Figs, 8b, 10). For example, ? suitable for the invention is a printing configuration where on the front there is the sales information and on the back the usage information, and where the perforated lines are hidden in the gussets of an intact bag, so that a sales package presents on the front only the said sales information and hide the perforated lines, being pleasing to the eye.

[0051] The bag proposed? advantageously stackable and packaged in the form of a compact package suitable for transport and sale, which also comprises at least one multifunctional elastic ring (119) suitable for closing the same package and also for blocking a single bag during use. In a first embodiment variant (Figs. 8a, 8b), a transport and sales package (120a) is proposed where multiple identical bags (10a, 10b) are stacked one on top of the other and folded together transversely only once, like a common pack of newspapers, and then closed by two multipurpose elastic rings (119) crossed between them. In a second packaging variant (Fig. 10), multiple identical bags are stacked, folded and sealed in such a way as to form an anti-? break-in (120b) which optimizes the sale and transport, being able to simultaneously solve certain known problems in the paper sack retail sector, such as for example the possibility? of theft d? a single bag of the package, or the possibility? that the edges of a package tear the plastic shopping bag or shopper, or the problem of encumbrance.

[0052] More in the construction detail (Fig. 10) of said anti? break-in (120b), the sacks (10a, 10b) are stacked one on top of the other and folded together transversely twice in the manner of a compact package without sharp edges, which is divided into four superimposed portions held by a single multifunction elastic ring (119); in this case, the elastic ring simultaneously acts as a means of retaining the bags and as an anti? break-in, for the purposes of sale in the shop, and then acts as a means of blocking a sack in use as described above. The said decorative and/or explanatory graphics (118) ? visible from the outside in a favorable position, substantially vertical in a shelf; the snap ring (119) ? inserted transversely (117) and cio? parallel to the mouth, in such a way as to stop all the bags together after a first fold, and also such that after a second fold the mouth edge (101) of the bags, already? rejoined to their bottom (102), is located alongside the main centerline fold (122), on the opposite side of the ring (119). The packaging (120b) ? then closed by means of an adhesive sealing label (121) in recyclable and/or biodegradable paper, applied across the mouth edge of the bags, of said main centerline fold (122) and of the bottom (102) of the bags, thus blocking the elastic ring (119) on the opposite side and thus preventing? the unthreading of a single bag in every direction, both from the head and from the side.

[0053] Alternatively, ? a similar pack configuration is suitable where the bags are folded together transversely for the first time, held by said elastic ring, and then are rolled up in the shape of a tube to be similarly closed by said paper adhesive label, which in this case will be ? more long.

[0054] Yes? therefore found in practice that this package (120b) optimized for transport and sale of the bags proposed by the invention ? contextually anti-theft, intrinsically preventing theft of both the bags contained (10a, 10b) and the elastic ring (119); it ? also anti? tearing since it has no sharp edges thanks to a double folded or tubular conformation, so as not to tear normal plastic shopping bags or shoppers. Furthermore, it can be positioned visibly on the shelf, where the graphic (118) remains in a lateral or vertical position, instead of? horizontal as in the solutions with only stacked bags. It is also noted that the general size of an intact package (120b) is ? reduced, where said folded or tubular conformation (Fig. 10) is advantageous on the shelf of a point of sale and also at home; in particular, this conformation optimizes the containment spaces inside the standardized cardboard boxes for transport to the point of sale, having dimensions equal to 30 cm by 40 cm according to the module called Epal pallet. Such a packaging anti ? break-in (120b) completely eliminates the packaging and the non-homogeneous waste, where even the said adhesive sealing label ? in recyclable paper and the elastic ring (119) ? multipurpose and reusable. In particular, the usual application and relative disposal of external strapping or the plastic closing bands that are generally applied to the products on the shelves of the points of sale with an anti-corrosion function is eliminated. break-in, when not? there is an external plastic film that seals the product completely. Furthermore, with respect to the previously described package (120a) (Fig. 8b), in this solution (120b) costs are optimized since only one elastic ring is required (Fig.10).

[0055] The advantageous adaptable and resealable bag (10a, 10b), shaped as described above, is also suitable for the separate collection of wet waste in residential and domestic environments; the bag proposed, in fact,? hygienic, ? resistant and ? fully transferable, together with its content, to common treatment and/or recycling plants for urban wet waste. To this end, the proposed bag ? made of 100% recycled and 100% long fiber Kraft paper, biodegradable and compostable, and also resistant to humidity as the paper is produced with an anti-pulping treatment of the type called WS, English acronym of Wet Strength, or a It is a similar process designed to give the paper high strength and resistance even when wet. Pi? in technical detail? suitable such a paper having a weight between 40 g/m2 and 90 g/m2, with capacity? of absorbency at least equal to 20 g of water per m² according to the one-minute Cobb test.

[0056] This bag for the separate collection of wet waste can possibly be equipped with an accessory capable of absorbing the excess water that drips and stagnates on the bottom of the bag. To this end, provision is made for the insertion of an absorber element into the bag, such as an additional bottom made up of a rectangular absorbent sheet, i.e. having a shape corresponding to the bottom of the bag internally considered. It ? supplied separately from the single bag while being combined with it, in the form of an external accessory included and/or enclosed in the transport and/or sale package (120a - 120b) of a group of identical bags, similarly to what is provided for the said multipurpose snap ring (119). The said absorber element pu? be placed by the user in an empty bag where deemed necessary, depending on the intended use, such as, for example, can? happen in the case of summer fruit waste including a lot of water, or when the bag has to remain inside the container for a long period of time. Such an absorbing element, once inserted in adherence on the bottom of a bag, retains the water and reinforces the bottom itself, preventing the glue of the welds from yielding in the presence of excessive humidity.

[0057] According to the preferred embodiment, the absorber element ? an absorbent sheet made of 100% recycled and 100% long fiber Kraft paper, biodegradable and compostable, and also resistant to damp since it is made with an anti-pulping treatment of the said WS type; considering the specific purpose, this paper must have a weight between 110 g/m2 and 160 g/m2, with capacity? of absorbency at least equal to 29 g of water per m² according to the one-minute Cobb test.

[0058] In summary, in the preferential method of use (30) (Figs. 7a - 7b) of the proposed bag (10a, 10b) the following consequential phases are foreseen (F1 ? F8):

F1) insertion of an intact bag in a container suitable for the purpose, and cio? lower in height than the bag and with the opening from above, to check the correct tear-off length along the longitudinal perforated lines (106);

F2) longitudinal guided tear (106) up to the intermediate or terminal slot suitable for the container used, like a stop notch, regulating and coordinating the separation of all the retaining means (105a, 105b) according to actual needs;

F3) possible transversal guided tear of the excess material in the retention means already? separated, where necessary, following the transverse perforated lines (107);

F4) reversal of the means of retention cos? separated, positioning them along the outer walls of the container like a turned-up flap;

F5) application of the multifunction snap ring (119), above said retaining means so? separated and turned upside down, locking them in adherence to the outer walls of the container;

F6) after having filled the bag up to the height of the container, there is? closing the mouth of the bag by turning the retaining means (105a, 105b) crosswise inwards, first by turning over the opposite retaining means joined to the side gussets (104) and then those joined to the flat walls (103);

F7) final closure of the bag by rolling up in the manner of a handle or mutual curling of the two upper retaining means (104, 105a - 105b), generally the one placed on the front and the one on the back of a bag in vertical position;

F8) extraction of the bag from the container and transport by hand.

[0059] Yes? finally, it has been found in practice that the operations envisaged by the aforementioned phases (F1-F8) are quick and intuitive, being also facilitated by the constructive conformation of the longitudinal perforated lines (106, 108? 111a - 111c). In conclusion, the paper bag (10a, 10b) proposed by the present invention ? versatile, safe, comfortable to use and achieves all intended purposes.

Legend

(10a, 10b) paper bag for papery or wet urban waste, of the resealable type and adaptable according to the container used, made according to the present invention. Respectively, in a basic version (10a) it has retention means integrated and separable longitudinally, while in an evolved version (10b) the same means can also be shortened by modular bands;

(100a, 100b) punched sheet of paper, respectively corresponding to said bag in the basic version (10a, 100a) and in the advanced version (10b, 100b); (101) bag mouth;

(102) welded bottom;

(103) flat side walls;

(104) bellows sidewalls, symmetrically opposed;

(105a, 105b) retention means, according to the present invention, which ? integrated into the walls of an intact bag before use; respectively, it ? provided for in a basic version (105a) which can be separated longitudinally and adjusted, to adapt to the container used, and in an evolved version (105b) where ? also shortenable for modular bands;

(106) longitudinal perforated line, being vertical in the bag in use;

(107) transverse perforated line, being horizontal in bag in use;

(108) lined holes;

(109) initial invitation, like a clean cut to start the rip correctly;

(110a, 110b) intermediate slot, of the through type, placed along the perforated line at regular intervals to subdivide it into modular sections and regulate tearing, described in two embodiments;

(111a, 111b, 111c) terminal slot, of the through type, with a protective function at the end ? tear or anti? laceration, described in three embodiments; (112) portion of non-perforated material in a perforated line, between hole and hole; (113a, 113b) mouth edge, respectively in an intact bag (113a) before use and in a bag adapted to the container (113b) after separation and flap of the retaining means;

(114a, 114b, 114c) modular sections between the intermediate and terminal passing slots of a longitudinal perforated line, also corresponding to the height of the bands delimited by the transversal perforated lines which cross them like a grid;

(115) side weld edge;

(116) longitudinal direction in a bag, otherwise called vertical;

(117) transverse direction in a bag, otherwise called horizontal;

(118) decorative and/or explanatory graphics;

(119) elastic ring or equivalent elastic band, as a multifunctional and reusable accessory, to close a pack of intact bags before using them and to block an adapted bag on the opening of a container;

(120a - 120b) transport and sale package of the proposed bag, formed by multiple identical bags stacked and folded into a pack, closed by at least one multipurpose elastic ring. Respectively, the packaging ? in a first embodiment variant (120a), with a crease and two crossed elastic rings, or in a second anti? break-in (120b) with double fold, an elastic ring and an adhesive sealing label.

(121) sealing adhesive label, in recyclable and/or compostable paper; (122) main centerfold, in a bundle of stacked bags;

(20) rigid container, such as a bin or basket;

(201) opening of the container, from above;

(30) way of using the proposed bag;

(F1 ? F8) consequential phases of use of the proposed bag.

Claims (15)

1. A paper bag (10a, 10b) for the differentiated collection of paper or wet waste, of the resealable and modular type, which ? shaped like a tubular bag having an opening (101), a welded bottom (102) and two flat side walls (103) joined longitudinally (116) to two bellows side walls (104) symmetrically opposite each other; the said paper bag (10a, 10b) ? insertable in a rigid container (20) having the opening (201) facing upwards, and ? comprising means for binding to the container (20, 201) in the vertical position of use; said paper bag (10a, 10b), characterized in that it comprises at least four longitudinal perforated lines (106) parallel to each other, which delimit integrated and adjustable retention means (105a, 105b); said retaining means (105a, 105b), being entirely integrated into the side walls (103, 104) of an intact bag (10a, 10b, 100a, 100b, F1), before use, and being separable longitudinally (116) according to need? by means of manual tearing guided along said longitudinal perforated lines (106, F2); said longitudinal perforated lines (106), being positioned at least in correspondence with all the longitudinal corner folds (116) between said flat walls (103) and bellows walls (104), starting from the upper edge (113a) and without reaching the bottom (102); said longitudinal perforated lines (106), being composed of: aligned holes (108), an initial guide (109) for tear start, at least two intermediate slots (110a - 110b) for tear interruption and a terminal slot (111a - 111c) of the end ? tore up; and where said intermediate and end slots (110a - 110b, 111a - 111c) are through holes of larger dimensions than said aligned holes (108), placed at predefined intervals to divide said perforated line and said tear into modular sections ( 114a - 114c), uniformed and aligned in all the perforated lines of the bag; said retaining means (105a, 105b), being adjustable in height (114a - 114c, F4, H) using the intermediate or end slot (110a - 110b, 111a - 111c) as a univocal and coordinated reference, which ? more close to the opening of the container (20, 201), in such a way as to regulate the tear (106, F2) and separate said retaining means (105a, 105b) in the form of custom-made flaps, which are: - which can be folded up against the outside of the container (20, 201, F4), with an empty bag, and locked therein by an elastic ring (119, F5) applied from the outside; - foldable inside like crossed flaps, when the bag is full (113b, F6), in such a way as to completely cover the contents by sealing it and in such a way that at least the two opposing upper flaps can be rolled up and/or curled together (F7, F8) in the manner of a handle. 2. A paper bag (10a, 10b) according to the preceding claim, characterized in that it also comprises transversal perforated lines (10b, 107) which cross said eyelets in the manner of a perforated grid, to shorten and adapt the whole bag and/or its retaining means (105a - 105b) in a coordinated way, according to bands corresponding to said modular portions (114a - 114c). 3. A paper bag (10a, 10b) according to claim 1 or 2, characterized in that it has visible graphics (118) of a decorative and/or explanatory type, printed on at least one flat wall (104). 4. A paper bag (10a, 10b) according to at least one of the preceding claims, characterized in that ? made of glueable and printable Kraft paper, with a thickness between 0.05 mm and 0.75 mm and a weight between 40 g/m2 and 90 g/m2; said paper, with a longitudinal breaking load between 0.5 kN/m and 9.5 kN/m and a transversal breaking load between 0.5 kN/m and 9.5 kN/m, according to ISO standards 1924-1/2; said paper, with a bursting strength between 50 kPa and 450 kPa, according to the ISO 2758 standard. 5. A paper bag (10a, 10b) according to at least one of the preceding claims, characterized in that a longitudinal perforated line (106) has a total length (109, 111a - 111c) which is ? higher than half of the opening width (101) of a flattened sack. 6. A paper bag (10a, 10b) according to at least one of the preceding claims, characterized in that in a longitudinal perforated line (106) the initial invitation (109) is? a clean through cut of between 5 mm and 50 mm in length, originating from the mouth edge (113a); and where said intermediate (110a, 110b) and end (111a, 111b, 111c) slots are through holes placed at a distance of at least 20 mm from each other, with a length between 5 mm and 50 mm in the longitudinal direction (116) and between 0.1 mm and 50 mm in width in the transverse direction (117). 7. A paper bag (10a, 10b) according to at least one of the preceding claims, characterized in that said intermediate slots are alternatively: elliptical (110a) or clean and thin cuts (110b) or circular holes; and where said terminal slots are alternatively: elliptical (111a) or clean and thin cuts (111b) or circular holes, or combined shape (111c) where a thin cut? joined to a final circular hole. 8. A paper bag (10a, 10b) according to at least one of the preceding claims, characterized in that for the collection of wet waste ? made of 100% recycled and 100% long fiber Kraft paper, biodegradable and compostable, with an anti-pulping treatment of the WS or Wet Strength type, with a weight between 40 g/m2 and 90 g/m2, with capacity? of absorbency at least equal to 20 g of water per m² according to the one-minute Cobb test. 9. A paper bag (10a, 10b) according to the preceding claim, characterized in that it is equipped with at least one absorber element that can be inserted inside, in adherence to the bottom, which ? supplied separately from the single bag but ? combined with it in the form of an external accessory, included and/or attached to a transport and/or sale package of the same bag. 10. A paper sack (10a, 10b) according to the preceding claim, characterized in that said absorber element ? a rectangular absorbent sheet, made of 100% recycled and 100% long fibre, biodegradable and compostable Kraft paper, with an anti-pulping treatment of the WS or Wet Strength type, with a weight between 110 g/m² and 160 g/m² sqm, with capacity? of absorbency at least equal to 29 g of water per m² according to the one-minute Cobb test. 11. A paper sack (10a, 10b) according to at least one of claims 1 to 10, characterized in that it ? stackable on top of each other and foldable together with the other stacked bags in such a way as to form a transport and/or sales package (120a, 120b) shaped like a pack of newspapers, with said graphics visible (118) on the external face, and closed by at least one external elastic ring (119) which acts as a multifunctional accessory being also reusable as a means of locking a single bag (10a, 10b) to a container (20), in the correct position of use, where fixed elastically from the outside around said retention means (105a, 105b) already? adapted and turned over on the opening of the container (20, 201, F5). 12. A paper bag (10a, 10b) according to the preceding claim, characterized in that said package (120a) comprises multiple bags equal to each other (10a, 10b) stacked and folded together transversely once, like a package divided into two overlapping portions and held by two orthogonally crossed multifunction elastic rings (119) (116, 117); and where said rings (119) have capacity? of diversified extension so as to adapt to the two different directions of application (116, 117) on the package (120), and also such as to adapt to two different container shapes (20, 201) for the purposes of said blocking of the bag to the container (10a - 10b, 105a - 105b, 20, 201, F5). 13. A paper bag (10a, 10b) according to claim 11, characterized in that said package (120b) is compact and anti? burglary, being comprised of multiple bags equal to each other (10a, 10b) stacked and folded together transversely twice, in the form of a package divided into four superimposed portions and held by a single multifunctional elastic ring (119), which holds them and prevents the extraction of the side, and where all the extremities? of the folded bags (101, 102, 122) are jointly closed by means of an adhesive sealing label (121) made of recyclable and/or biodegradable paper. 14. A paper sack (10a, 10b) according to claim 11 or 12 or 13, characterized in that the perimetric development at rest of said multifunctional elastic ring (119) ? equal to double the opening width (101) of a flattened bag, considering a tolerance of +/- 30%. 15. A paper bag (10a, 10b) according to at least one of the preceding claims, characterized in that it has a method of use (30) which provides for the following consequential steps (F1 ? F8): F1) insertion of an intact bag in a container suitable for the purpose, and cio? lower in height than the bag and with the opening from above, to check the correct tear-off length along the longitudinal perforated lines (106); F2) longitudinal guided tear (106) up to the intermediate or terminal slot suitable for the container used, like a stop notch, regulating and coordinating the separation of all the retaining means (105a, 105b) according to actual needs; F3) possible transversal guided tear of the excess material in the retention means already? separated, where necessary, following the transverse perforated lines (107); F4) reversal of the means of retention cos? separated, positioning them along the outer walls of the container like a turned-up flap; F5) application of the multifunction snap ring (119), above said retaining means so? separated and turned upside down, locking them in adherence to the outer walls of the container; F6) after having filled the bag up to the height of the container, there is? closing the mouth of the bag by turning the retaining means (105a, 105b) crosswise inwards, first by turning over the opposite retaining means joined to the side gussets (104) and then those joined to the flat walls (103); F7) final closure of the bag by rolling up in the manner of a handle or mutual curling of the two upper retaining means (104, 105a - 105b), generally the one placed on the front and the one on the back of a bag in vertical position; F8) extraction of the bag from the container and transport by hand.