WO2021084340A1

WO2021084340A1 - Disposable package with break opening

Info

Publication number: WO2021084340A1
Application number: PCT/IB2020/059093
Authority: WO
Inventors: Ferruccio BERTOLINI; Gino TANSINI; Riccardo ZAMMORI
Original assignee: Guala Pack S.P.A.
Priority date: 2019-10-28
Filing date: 2020-09-29
Publication date: 2021-05-06
Also published as: IT201900019854A1; MX2022004175A; ES2962925T3; US20220324628A1; EP4051603B1; EP4051603A1

Abstract

A disposable package (1) with break opening for dispensing a liquid, dense or semi-dense product, consisting of a semi-rigid film (2) and a flexible film (8) which form a volume (10) for containing the product. The semi-rigid film comprises at least one layer of an admixed material, in which: said admixed material comprises a base polymer and an additive, in which the base polymer is selected from the group comprising polypropylene and polyethylene and the additive is selected from the group comprising COCs (Cyclic-Olefin-Copolymers), a mineral filler such as talc and/or calcium carbonate, a nucleating agent; the flexible film (8) comprises at least one layer comprising said base polymer, so that the package is monomaterial.

Description

"DISPOSABLE PACKAGE WITH BREAK OPENING" DESCRIPTION

Field of the invention

[0001]The present invention relates to the field of disposable packages with break opening for dispensing a liquid, dense or semi-dense product.

[0002]These packages generally have a flat, rectangular shape and are of limited size, such as to fit in one hand. Normally, they consist of a semi-rigid film and a flexible film applied to an inner face of the semi-rigid film, so as to form a volume for containing the product. [0003]On the outer face, the semi-rigid film typically has one or more notches from which, when the semi-rigid film is bent, a fracture is triggered which locally breaks the semi-rigid film, allowing the product contained in the volume to outflow.

Background art

[0004]Several solutions of disposable packages with break opening of the type mentioned above are known. Some solutions are illustrated, for example, in the documents US7121409, W02008038074, EP2170727, W02009040629,

EP2055474, W02010123581, US8662349, EP2766277, EP2628691, EP2928789, EP3019415, EP2944579, WO2015166453, EP3145836,

KR20160039388, KR101597150, KR101772884, US20170283145 US10370154 WO2018130984 KR200489112 WO2019106555 WO2019138435, WO2019142143 and WO2019142144.

[0005]These packages are particularly appreciated for the ease of use thereof and are rapidly spreading in various application fields, for example for dispensing food condiments, personal care products, medical products, and the like.

Object of the invention

[0006]Manufacturing companies and consumers are now particularly attentive to the environmental impact of consumer products. Packages of the type mentioned above receive the same attention, given the wide diffusion and the need for the packages to be properly disposed of after use.

[0007]Since the two films composing the package have very different functions (a semi-rigid film acts as a support and must undergo localized fracture following bending, the other flexible film has a containing function and must not undergo breakage as a result of the bending of the semi-rigid film to which it is applied), the materials used are different and this does not allow immediate disposal.

[0008]It is the object of the present invention to provide a disposable package with break opening which meets the field needs and overcomes the drawbacks mentioned with reference to the background art. [0009]Such an object is achieved by a disposable package with break opening according to claim 1. The dependent claims identify further advantageous embodiments of the invention. [0010]In particular, such an object is achieved by a disposable package with break opening for dispensing a liquid, dense or semi-dense product, consisting of a semi-rigid film, having an inner face and an opposite outer face, and a flexible film sealingly applied to the inner face of the semi-rigid film so as to create a volume for containing the product, in which the semi rigid film comprises at least one layer of an admixed material, in which:

[0011]- said admixed material comprises a base polymer and an additive, in which the base polymer is selected from the group comprising polypropylene and polyethylene and the additive is selected from the group comprising COCs (Cyclic-Olefin-Copolymers), a mineral filler such as talc and/or calcium carbonate, a nucleating agent; [0012]- the flexible film comprises at least one layer comprising said base polymer, so that the package is monomaterial .

[0013]The features and advantages of the disposable package with break opening according to the present invention will become apparent from the description given below.

Brief description of the drawings

[0014]Figure 1 shows a disposable package with break opening, according to an embodiment of the present invention.

[0015]Figure 2 shows the package in figure 1, from a further observation point.

[0016]Figures 3 to 7 diagrammatically show the structure with layers of semi-rigid film of the package, each in a bent configuration, according to different embodiments. Detailed description

[0017]With reference to the accompanying drawings, numeral 1 indicates, as a whole, a disposable package with break opening according to an embodiment of the present invention.

[0018]The package 1 comprises a semi-rigid film 2, having an inner face 4 and an opposite outer face 6, and a flexible film 8 applied to the inner face 4 of the semi rigid film 2, so as to create a volume 10 for containing a liquid, dense or semi-dense product to dispense.

[0019]Along the perimeter edge 8a-8d thereof, the flexible film 8 is sealingly applied to the semi-rigid film 2, for example by welding, so that the volume 10 is sealingly closed to contain the product. [0020]On the outer face 6, the semi-rigid film 2 preferably has a weakening line 12, consisting for example of a notch having a predefined depth, from which a local fracture is triggered by bending P the semi-rigid film 2, which allows the outflow of the product contained in the volume 10.

[0021]According to an alternative embodiment, there is no weakening line present on the outer face 6 of the semi rigid film 2.

[0022]The package 1 is substantially monomaterial, such a term meaning that at least 80% by weight of the package is made from the same base polymeric material.

[0023]Such a feature allows an immediate disposal of the package after use, as it consists of a single base material. [0024]Furthermore, the materials and the dimensions of the layers of the package are selected so that the package has a relative density <1, so as to be floating. Such a feature allows, during waste disposal processes, to separate these packages by floating in water. [0025]According to an embodiment, the flexible film 8 is a coextruded or laminated film, consisting of one or more layers of PE (Polyethylene), possibly interspersed with barrier layers of EVOH (Ethylene-Vinyl-Alcohol) or SiOx

(Silicon oxides) or AlOx (aluminum oxides), in which the inner layer is weldable to the inner face 4 of the semi rigid film 1 and for example made of a polyethylene layer.

[0026]According to a further embodiment, the flexible film 8 is a coextruded or laminated film, consisting of one or more layers of PP (Polypropylene), possibly interspersed with barrier layers of EVOH or SiOx or AlOx, in which the inner layer is weldable to the inner face 4 of the semi rigid film 1 and for example made of a polypropylene layer. Example 1

[0027]According to a first embodiment of the invention (figure 3, Table 1), the semi-rigid film 1 is coextruded, substantially made of polypropylene and comprises three layers: a first inner layer 2i, bearing the inner face 4 and intended to come into contact with the product, an intermediate layer 2m and a first outer layer 2e, bearing the outer face 6 and intended to receive any weakening line.

[0028]The first inner layer 2i is made of PP or comprises two sub-layers of PP interspersed with a barrier sub layer of EVOH or PVOH (Poly-Vinyl-Alcohol); the intermediate layer 2m is made of PP; the first outer layer 2e is made of PP with the addition of a functional additive adapted to increase the rigidity of the material. [0029]Said functional additive is selected from the group comprising COCs (Cyclic-Olefin-Copolimers) or other mineral filler, such as talc and/or calcium carbonate, or other nucleating agents. [0030]The composition of the first outer layer 2e makes the PP more rigid and the poor ability to stretch facilitates the fracture on the outer face 6 of the semi rigid film 1.

[0031]According to such an embodiment, the thickness of the semi-rigid film 1 is about 350 microns.

[0032]

[0033]According to such an embodiment, bending the semi- rigid film from the opposite side to the outer face, i.e., making the inner face convex, generating a tensional state of traction, no fracture will be obtained, neither on the outer face, which remains concave and does not undergo traction, nor on the inner face, where the inner layer 2i is sufficiently flexible so as not to break.

Example 2

[0034]According to a further embodiment (figure 3, Table 2) of a semi-rigid film 2, the structure and composition are substantially identical to those described for Example 1, except for the inner layer, made of admixed PP. [0035]

[0036]According to such an embodiment, by bending the semi-rigid film in one direction or the other, a fracture is obtained on the outer face or on the inner face, according to the bending direction, which causes one or the other face to take a convex shape.

Example 3

[0037]According to a further embodiment (figure 4, Table 3), the semi-rigid film 2 is a laminate and comprises, from the inner face 4 towards the outer face 6, a first inner layer 2i bearing the inner face 4, a second inner layer 2ii, an intermediate layer 2m, a second outer layer 2ee and a first outer layer 2e. [0038]The first inner layer 2i is of PP; the second inner layer 2ii is in admixed PP; the intermediate layer 2m is of PP or is a barrier layer comprising a first sub-layer of PP, an intermediate layer of EVOH or PVOH or other barrier material compatible with PP, and a second sub layer of PP; the second outer layer is of PP or comprises a first sub-layer of PP, a barrier layer of EVOH or PVOH or other barrier compatible with PP or an adhesive, and a second sub-layer of PP; the first outer layer 2e is of PP or comprises a first sub-layer of PP, a barrier layer of EVOH or PVOH or other barrier compatible with PP, and a second sub-layer of PP.

[0039]According to such an embodiment, the total thickness of the semi-rigid film is 410 microns.

[0040]

[0041]In such a case, the fracturable layer, which generates the fracture by bending, is the second inner layer 2ii, in admixed PP.

[0042]To facilitate the fracture, the sum of the thicknesses of the non-admixed layers external to the admixed layer should be equal to or less than half the sum of the thicknesses of the admixed layer and internal thereto. In other words, according to the example in figure 4: 12m + 12ee + t2e - ½ (t2ii + t2i) where tx is the thickness of the layer X.

[0043]Advantageously, in such an embodiment, the weakening line obtained on the outer face 6 preferably has a depth such as not to damage the barrier layer (second outer layer 2ee or first outer layer 2e), thus preserving the integrity thereof.

Example 4

[0044]According to a further embodiment (Figure 5, Table 4), the semi-rigid film 2 is coextruded in several layers, typically 7.

[0045]The semi-rigid film 2 comprises, from the inner face 4 towards the outer face 6, a first inner layer 2i bearing the inner face 4, a second inner layer 2ii, an inner binding layer 21i, a barrier layer 2o, an outer binding layer 21e, a second outer layer 2ee and a first outer layer 2e.

[0046]According to such an example, the first inner layer 2i is of PP, the second inner layer 2ii is in admixed PP; the inner binder layer 21i is a binder or adhesive; the barrier layer 2o is of EVOH or PVOH, the outer binder layer 21e is a binder or adhesive; the second outer layer 2ee is in admixed PP; the first outer layer 2e is of PP. [0047] According to such an embodiment, the semi-rigid film has a thickness of 350 microns. [0048]

[0049]In such an embodiment, the fragile layers, which undergo breakage by bending, are the second inner layer 2ii and the second outer layer 2ee, which undergo breakage alternately, according to the bending direction. [0050]For the distribution of the thicknesses, if the opening is to occur on the second outer layer, the formula shown above is followed:

12ee £ ½ (t2i÷t2ii+t21i+t2o+t21e+t2e).

[0051]Similarly, if the opening is to occur on the second inner layer, the formula below is followed:

12ii £ ½ (t2e+t2ee+t21e+t2o+t21i+t2i). Example 5

[0052]According to a further embodiment (figure 6, Table 5), the semi-rigid bottom 2 is made by coupling several semi-rigid bottoms, each of the latter formed as described in the previous examples. [0053]For example, according to an embodiment, a semi- rigid bottom 2 comprises, from the inner face 4 towards the outer face 6, a first inner layer 2i bearing the inner face 4, a second inner layer 2ii, a third inner layer 2iii, an inner binder layer 21i, a barrier layer 2o, an outer binder layer 21e, a third outer layer 2eee, a second outer layer 2ee and a first outer layer 2e bearing the outer face 6.

[0054]The second inner layer 2ii is in admixed polypropylene; the second outer layer 2ee is in admixed polypropylene. The barrier layer 2o is of EVOH or OPP/AlOx or OPP/SiOx or OPP/EVOH (OPP = Oriented Polypropylene) .

[0055]

[0056]The semi-rigid film according to such an embodiment undergoes fracture by bending in one direction or the other and, if provided with weakening lines for the trigger of the fracture, on the inner face and/or on the outer face, the depth of these weakening lines is such as not to affect the barrier layer.

Example 6

[0057]According to a further embodiment (figure 7, Table 6), a semi-rigid film 2 comprises, from the inner face 4 towards the outer face 6, a first inner layer 2i bearing the inner face 4, a second inner layer 2ii, a third inner layer 2iii, an inner binder layer 21i, a barrier layer 2o, an outer binder layer 21e and a first outer layer 2e, bearing the outer face 6. [0058]According to such an embodiment, the first inner layer 2i is made of polypropylene, the second inner layer 2ii of admixed polypropylene, the third inner layer 2iii of polypropylene, the inner binding layer 21i is an adhesive, the barrier layer 2o of EVOH or 0PP/A10x or OPP/SiOx, the outer binder layer 21e is an adhesive and the first outer layer 2e is in BOPP (Biaxially-Oriented-

Polypropylene) . [0059]

[0060]According to such an embodiment, the barrier layer is coupled by means of an adhesive to an outer layer of bi-oriented plastic material, for example a BOPP, so as to be protected from scratches and impacts. [0061]In the variant with a weakening line on the inner face, such a weakening line preferably has a depth such as to affect at most the third inner layer, without affecting the barrier layer.

[0062]In the variant with a weakening line on the outer face, such a weakening line preferably has a depth such as to affect only the first outer layer, without affecting the barrier layer.

[0063]

Further embodiments [0064]According to further embodiments, the package is shaped so as to take a particular shape, for example a stylized bottle. In such a case, there is a narrow-width region which forms a neck, and the fracture is triggered in such a region. [0065]Innovatively, the package described above meets the field needs, as the bending of the package causes a fracture which allows the product to outflow, and overcomes the aforementioned drawbacks, since the package is substantially monomaterial and therefore easily disposable. [0066]Advantageously, moreover the package described above is suitable for selective disposal, since it can be separated by means of the usual separation processes, and in particular by floating in water. [0067]It is apparent that those skilled in the art, in order to meet contingent needs, may make changes to the package described above, all contained in the appended claims.

Claims

1. Disposable package (1) with break opening for dispensing a liquid, dense or semi-dense product, consisting of a semi-rigid film (2), having an inner face (4) and an opposite outer face (6) and a flexible film

(8) sealingly applied to the inner face (4) of the semi rigid film (2) so as to create a volume (10) for containing the product, wherein the semi-rigid film comprises at least one layer in an admixed material, wherein:

- said admixed material comprises a base polymer and an additive, wherein the base polymer is selected from the group comprising polypropylene and polyethylene and the additive is selected from the group comprising COCs (Cyclic-Olefin-Copolymers), a mineral filler such as talc and/or calcium carbonate, a nucleating agent;

- the flexible film (8) comprises at least one layer comprising said base polymer, so that the package is monomaterial .

2 . Package according to claim 1, wherein the total amount of base polymer in the package is > 80% by weight.

3. Package according to claim 1 or 2, wherein said package is floating in water.

4. Package according to claim 3, wherein the material and thickness of each layer composing the semi-rigid film and the flexible film are defined so as to obtain a relative density to water < 1.

5. Package according to any one of the preceding claims, wherein the outer face (6) of the semi-rigid film (2) is free of weakening lines.

6. Package according to any one of claims 1 to 4, wherein the outer face (6) is provided with at least one weakening line (12) to trigger the fracture.

7. Package according to any one of the preceding claims, wherein the inner face (4) of the semi-rigid film (2) is free of weakening lines.

8. Package according to any one of claims 1 to 6, wherein the inner face (4) is provided with at least one weakening line to trigger the fracture.

9. Package according to any one of the preceding claims, wherein the semi-rigid film (2) is coextruded.

10. Package according to any one of claims 1 to 8, wherein the semi-rigid film (2) is laminated.

11. Package according to any one of the preceding claims, wherein the semi-rigid film (2) comprises at least one barrier layer (2m, 2o) in a barrier material, wherein said barrier material is selected from the group comprising EVOH, PVOH, AlOx, SiOx , 0PP/A10x, OPP/SiOx.

12. Package according to claim 11 when dependent on claim 6 or 8, wherein the weakening line has a depth such as not to affect the barrier layer.