Insulating glazing unit with micro-drilled film shielding element

Abstract

Insulating glazing unit (1) comprising a supporting frame (2); a pair of plates (3) at least partly transparent and fixed to the frame (2) and spaced apart from each other to define a gap (4) and collecting means (7) constrained to the frame (2) and arranged in the gap (4). The insulating glazing unit (1) further comprises a shielding element (5) arranged inside the gap (4) and comprising a film (6) having a free end (6a) and an opposite engagement end (6b) engaged with the collecting means (7). The shielding element (5) is provided with a plurality of through holes (8) distributed on the film (6). The collecting means (7) are adapted to switch the shielding element (5) at least between an extended configuration and a retracted configuration, wherein the free end (6a) of the film (6) is closer in a longitudinal direction (X) to the collecting means (7) with respect to the extended configuration.

Description

[0001] TITLE: "Insulating glazing unit with micro-drilled film shielding element".

[0002] DESCRIPTION

[0003] FIELD OF THE INVENTION

[0004] The present invention relates to an insulating glazing unit with a film shielding element and a method for manufacturing the aforesaid insulating glazing unit. This invention finds particular application for windows, or more in general space separators, in buildings such as offices, restaurants, hospitals or more.

[0005] Description of the prior art

[0006] It is known in the art to make insulating glazing units comprising a frame and at least two glass plates hermetically fixed to the frame to define a gap therebetween. Such insulating glazing units comprise, inserted in the gap, a Venetian type blind or pleated blinds or roller blinds.

[0007] According to the known art, the blinds adopted in the insulating glazing unit can be wound or compacted by collecting means, for example a roller, placed inside the gap. Specifically, the blinds are configured to switch between a retracted or open configuration, an extended or closed configuration, and a series of intermediate configurations for a partial opening or closing.

[0008] In the state of the art, winding blinds, also called roller blinds, are made of fabric and can have an open weave to allow more light to enter through the insulating glazing unit. However, for the aforesaid fabric winding blinds, a high thickness is obtained in the retracted configuration, due to the winding of several layers. The well-known insulating glazing units with the aforementioned roller blinds therefore require the creation of a large gap. However, this makes difficult to maintain the correct thermal insulation, especially for insulating glazing units with a great height.

[0009] To overcome the problem, blinds made of polymeric film are also known in the art, adapted to reduce the overall thickness once the blinds have been wound around the collecting means. Contrary to fabric blinds, the known film blinds actuate a diffusion of transmitted light, with loss of the external image, and / or a chromatic distortion due to a reflective glossy surface, which can generate an external mirror effect and consequent glare.

[0010] Problem of the prior art

[0011] The blinds known in the state of the art are able to reflect a good percentage of the solar energy which hits the insulating glazing unit. However, at least a portion of this energy is absorbed by the blinds, thus leading to an increase in the internal temperature of the insulating glazing unit.

[0012] Disadvantageously, an increase in temperature entails an increase in the risks for the insulating glazing unit, including deformations of the glass plates which could swell or, in extreme cases, break.

[0013] The problem is particularly felt for sealed insulating glazing units, where therefore the heat accumulated internally is difficult to dissipate outside.

[0014] SUMMARY OF THE INVENTION

[0015] The object of the instant invention is to provide an insulating glazing unit and a method for manufacturing the insulating glazing unit which overcome the drawbacks of the aforementioned prior art.

[0016] In particular, it is an object of the present invention to provide an insulating glazing unit and a method for manufacturing such an insulating glazing unit capable of allowing a lower accumulation of solar energy.

[0017] The technical task mentioned and the objects stated are substantially achieved by an insulating glazing unit and by a method for manufacturing the insulating glazing unit comprising the technical features set out in one or more of the appended claims. Advantages of the invention

[0018] The insulating glazing unit of the present invention comprises a frame, a pair of plates mounted on the frame and defining a gap, collecting means inserted in the gap and a shielding element engaged with the collecting means. In particular, the shielding element is configured to switch between a retracted and an extended configuration. Furthermore, the shielding element comprises a film provided with folding lines and a plurality of holes. Thereby, the shielding element is hit by sunlight for a smaller surface area. A certain amount of light instead passes through the holes and is not absorbed. Therefore, the amount of accumulated solar energy is reduced and the temperature inside the insulating glazing unit is kept within safe levels.

[0019] In addition, the manufacturing method according to the present invention allows to obtain an insulating glazing unit with the advantages listed above. Preferably, the method envisages drilling the film by means of a drilling technique with the removal of material. It is thereby ensured that the holes are not clogged by residual material, which is removed, and the effect of reducing absorbed energy is amplified. Furthermore, the absence of residues ensures greater uniformity in the shape of the holes, and it is therefore possible to more effectively control their dimensions and the amount of heat absorbed or transmitted.

[0020] Still preferably, it is also possible to adapt the size and arrangement of the holes on the film according to needs, so as to maximize the above-described advantages.

[0021] BRIEF DESCRIPTION OF THE DRA WINGS

[0022] The features and advantages of the present invention will become apparent from the following detailed description of a possible practical embodiment thereof, illustrated by way of non-limiting example in the accompanying drawings, in which:

[0023] - Figure la shows an insulating glazing unit according to the present invention; - Figure lb shows the insulating glazing unit of Figure la with partial removal of an element for better understanding;

[0024] - Figure 2a shows a sectional view of the insulating glazing unit of Figure la;

[0025] - Figure 2b shows an enlargement of a detail of the insulating glazing unit of Figure 2a;

[0026] - Figure 2c shows an enlargement of a further detail of the insulating glazing unit of Figure 2a;

[0027] - Figure 3 a shows a first embodiment of a detail of the insulating glazing unit of Figure la;

[0028] - Figure 3b shows an alternative embodiment to the first embodiment of the detail of Figure 3 a;

[0029] - Figure 4a shows a second embodiment of a detail of the insulating glazing unit of Figure la;

[0030] - Figure 4b shows the second embodiment of the detail of Figure 4a.

[0031] DETAILED DESCRIPTION

[0032] The present invention relates to an insulating glazing unit 1 for the thermal insulation of a house or a building, as shown in Figure la and Figure lb.

[0033] The insulating glazing unit 1 of the present invention comprises a supporting frame 2. Preferably, the frame 2 comprises an upper crosspiece 21, a bottom 22, and at least two side posts 23 adapted to connect the upper crosspiece 21 and the bottom 22 to each other so that they are separated along a longitudinal direction X. Typically, the frame 2 has the function of allowing the insulating glazing unit 1 to be fixed to a fixture of an external wall of a building or to an internal wall which separates two rooms. The insulating glazing unit 1 further comprises at least one pair of plates 3, at least partially transparent and fixed to the frame 2. The plates 3 are spaced apart from one another along a thickness direction Y perpendicular to the longitudinal direction X to define a gap 4 therebetween, shown in Figures 2a-2c. Preferably, the gap 4 is defined between the pair of plates 3, the upper crosspiece 21, the bottom 22 and the two side posts 23. Still preferably, the plates 3 are parallel to each other. Still preferably, the plates 3 are made of glass. Alternatively, the plates 3 are made of any suitable transparent or semi-transparent material.

[0034] It should be noted that the insulating glazing unit 1 of the present invention is preferably of the non-ventilated, in particular sealed, gap 4 type. Alternatively, the insulating glazing unit 1 can be of the type with an unsealed gap 4, such as to allow a limited air circulation, in particular by convection. For example, a slit can be provided for vertical fluid communication with the gap 4 through one, and preferably only one, of the upper crosspiece 21 and the bottom 22.

[0035] The structure of the frame 2 and the plates 3 is known per se to the person skilled in the art, and will therefore not be further described.

[0036] The insulating glazing unit 1 further comprises a shielding element 5 arranged inside the gap 4. The shielding element 5 comprises a film 6, or film blind, an example of which is shown in the attached figures. Preferably, the shielding element 5, and therefore the film 6, is made of polymeric material, and more preferably of polyester. Therefore, a fabric shielding element 5 is not used, which would occupy excessive volumes. In particular, the shielding element 5 has the function of reflecting sunlight and allowing less of it to enter an environment inside the building.

[0037] As shown in Figures 2a-2c, the insulating glazing unit 1 therefore comprises collecting means 7 constrained to the frame 2 and placed inside the gap 4, for example a roller 71, detailed below.

[0038] The film 6 has a free end 6a and an engagement end 6b opposite the free end 6a with respect to the longitudinal direction X.

[0039] The engagement end 6b of the film 6 is engaged with the collecting means 7. Preferably, the engagement end 6b is fixed to the collecting means 7 or, alternatively, reversibly connected to the collecting means 7 by coupling means, not illustrated in the appended figures.

[0040] The collecting means 7 are adapted to switch the shielding element 5 at least between an extended configuration and a retracted configuration, wherein the free end 6a of the film 6 is closer along the longitudinal direction X to the collecting means 7 with respect to the extended configuration, Preferably, the collecting means 7 are adapted to switch the shielding element 5 between the extended configuration, the retracted configuration and one or more intermediate configurations.

[0041] It should be noted that, in the extended configuration, the shielding element 5 is partially or totally lowered. In the retracted configuration, the shielding element 5 is instead completely raised so as to allow sunlight to pass through the gap 4. In the intermediate configurations, there is a partial lowering according to different heights of the shielding element 5.

[0042] In a known manner, the insulating glazing unit 1 can comprise driving means (not illustrated) connected to the collecting means and operable from outside the insulating glazing unit to move the collecting means and thus the shielding element.

[0043] According to an aspect of the invention, the film 6 has an inner surface 61 and an opposite outer surface 62 extending between the free end 6a and the engagement end 6b. Also preferably, each surface 61, 62 of the film 6, at least partially and at least in one configuration, faces a respective plate 3. In particular, the inner surface 61 is configured to face the inside of the roller 71, when wound, i.e. in the retracted configuration, while the outer surface 62 is configured to face the outside of the roller 71, when wound. Indifferently, any one of the inner surface 61 and the outer surface 62 can face the inside of a building environment, while the opposite surface will face the outside of such an environment.

[0044] According to an embodiment of the invention, the film 6 can be opaque. Alternatively, the film 6 can be transparent. Still alternatively, the film 6 can be made of diffusing material.

[0045] In accordance with the preferred embodiment of the invention, the film 6 of the shielding element 5 can have a layer of reflective material 60 on the surface which in use faces the outside of the building, which from the point of view of winding can be the inner surface 61 or the outer surface 62. Preferably, the reflective material layer 60 is metallised, in particular obtainable by physical vapour deposition (PVD) or thermovaporization. Advantageously, the metallised reflective material layer 60 allows to increase the reflected component of the sunlight incident on the insulating glazing unit 1, i.e., to reduce the energy transmission of solar energy and, therefore, the temperature inside the insulating glazing unit 1.

[0046] However, it is not excluded that a reflective layer is also applied on the surface facing the interior of the building. In alternative embodiments, this surface can instead be painted or without any coating.

[0047] According to an aspect of the invention, the shielding element 5 is microdrilled. In particular, the shielding element 5 is provided with a plurality of through holes 8 distributed on the film 6, as illustrated in Figure 3a and Figure 3b.

[0048] According to the invention, each hole 8 has a respective hole surface 8a defined by the surface extension, i.e., the area, of the hole on the film. In accordance with the preferred embodiment of the invention, the insulating glazing unit 1 has a coverage ratio between the sum of the hole surfaces 8a and a surface of the film 6, i.e., the inner or outer surface 61 or 62, greater than 0.05. Preferably, the coverage ratio is comprised between 0.01 and 0.3, more preferably 0.1.

[0049] For the purposes of the present invention, coverage ratio is understood as the ratio between the surface extension of the hole 8 and the surface extension of the film 6.

[0050] Advantageously, the presence of the holes 8 on the film 6 allows a film 6 to be inserted inside the gap 4, which film 6 is capable of allowing a certain amount of sunlight to pass through the holes and not be absorbed.

[0051] It should be noted that, although the shielding element 5 is adapted to shield, and therefore mainly to reflect, sunlight, part of the light is still absorbed by the shielding element 5. Thereby, especially in the presence of high external temperatures, there is an increase in the internal temperature of the insulating glazing unit 1 with an increase in associated risks.

[0052] The film 6 of the present invention instead has the particularly advantageous technical effect of reducing the amount of accumulated solar energy and limiting the internal temperature of the insulating glazing unit 1. In fact, the film 6 is hit by sunlight on a smaller surface area thanks to the presence of holes 8, and is therefore subject to a lower absorption of solar energy. This technical effect can be combined with the presence of a metallised layer to further reduce the energy transmission and, therefore, the internal temperature of the insulating glazing unit 1.

[0053] Still advantageously, the presence of holes 8 on the film 6 allows to obtain a further advantageous technical effect, namely to allow a better view outside from the building environment in which the insulating glazing unit is mounted, regardless of whether the film is transparent or opaque. Still advantageously, with respect to known films, the film 6 of the present invention does not require treatments to improve the visual quality of the exterior, which could distort the image due to the diffusion of sunlight and / or a colour defect. Consequently, the quality of the view remains substantially unchanged.

[0054] According to the preferred embodiment of the invention, each hole 8 has a characteristic dimension of less than 2 mm. Preferably, the characteristic dimension is comprised between 0.8 and 1 mm. Still preferably, the holes 8 have a substantially circular shape.

[0055] Within the scope of the present description, characteristic dimension means a value which better defines the geometry in question. For example, for a circular geometry, the characteristic dimension of the holes 8 is given by the diameter thereof. For polygonal or irregular geometries, the diameter of a minimum circumference circumscribed to the hole 8 can be considered as the characteristic dimension of each hole 8.

[0056] Preferably, each hole 8 is spaced from one or more adjacent holes by an interaxis distance comprised between 1.5 mm and 10 mm, more preferably comprised between 2.5 mm and 6 mm.

[0057] It should be noted that the size of the holes 8 and the distance therebetween can be adapted based on the needs of the window to which the present insulating glazing unit will be mounted.

[0058] Still preferably, the holes 8 are evenly distributed on the film 6. Alternatively, the holes 8 are distributed in certain areas of the film 6. By way of example, the film 6 can have the plurality of holes 8 in side portions of the film 6 itself, with the exception of perimeter portions and / or a central portion. Advantageously, the holes 8 can be distributed according to predefined patterns or geometries, adapted to optimize the coverage ratio and, therefore, the absorption of solar energy. Such an advantage can be combined with the further advantage of being able to arrange the holes so as to obtain areas with a wider view of the external environment.

[0059] Still advantageously, the arrangement of the holes 8 can occur according to particular graphics, for example writings or symbols attributable to the manufacturer.

[0060] According to the preferred embodiment of the invention, the holes 8 are obtainable by a drilling technique with material removal, in particular a milling technique. It should be noted that the drilling technique with material removal allows to avoid the accumulation of materials along the edges of the holes 8 or obstruction thereof, thus limiting the thickness of the film 6.

[0061] According to alternative embodiments, the holes 8 are obtainable by means of one of the following techniques: cold drilling, in particular with a rotating tip or with step cutting, or alternatively hot needle drilling, laser drilling, or any other type of drilling suitable for the film 6 according to the present disclosure.

[0062] In accordance with the preferred embodiment of the invention, the shielding element 5 comprises a plurality of folding lines 9 which extend on the film 6 along a width direction Z transverse to the longitudinal direction X and the thickness direction Y. The folding lines 9 are also spaced apart from each other along the longitudinal direction X.

[0063] Preferably, the film 6 is configured to fold along the folding lines 9 to pass at least from the extended configuration to the retracted configuration.

[0064] In the preferred embodiment, the folding lines 9 all have concavities on a same surface of the film 6, for example the inner or outer surface 61, 62. Furthermore, in the extended configuration the film 6 is arched between pairs of adjacent folding lines 9. Instead, the film 6 is less arched between pairs of adjacent folding lines 9 in the retracted configuration than in the extended configuration.

[0065] Given the small thickness of the film 6, the folding lines 9 improve the rigidity of the film 6 and facilitate its orderly unfolding in the extended configuration, without ripples or undulations. Preferably, the film has a thickness comprised between 10 and 30 pm, for example 19 pm or 23 pm.

[0066] It should be noted that the drilling technique with material removal allows the film 6 to be drilled with or without folding lines 9. In other words, such a technique allows the film 6 to be drilled after the folding lines 9 have been made, and thus to arrange the holes 8 as most desired with respect to the folding lines 9. Other drilling techniques are applicable only before making the folding lines 9, and therefore do not allow a precise positioning of the holes 8 with respect thereto.

[0067] According to an aspect, the holes 8 are distributed on the film 6 between one or more pairs of adjacent folding lines 9. Preferably, the folding lines 9 are free of holes 8, as shown in Figure 3b. Thereby, it is possible to ensure the correct mechanical strength of the film 6, without weakening at the folding lines and without losing the endurance and stability of the folding lines 9. Alternatively, it is possible to obtain a film 6 provided with folding lines 9 provided with holes, as shown in Figure 3a.

[0068] Preferably, as shown in Figures 2a, 2b, 3a, 3b, 4a and 4b, the collecting means 7 comprise a roller 71 adapted to rotate around a rotation axis R, substantially parallel to the width direction Z, to wind and / or unwind the shielding element 5 between the retracted configuration and the extended configuration.

[0069] Still preferably, the driving means defined above comprise, for example, an electric motor, not illustrated, configured to operate and rotate the roller 71.

[0070] According to an embodiment, the frame 2 further comprises at least one sliding guide 20, illustrated in Figure la and Figure lb, fixed or formed in at least one side post 23. By way of example, the sliding guide 20 comprises a groove extending along the longitudinal direction and shaped to receive a side edge of the shielding element. It should be noted that such a movement mechanism of the shielding element 5 is known to the person skilled in the art and will therefore not be further disclosed.

[0071] In an embodiment, the shielding element 5 is of the pleated type. In this case, the folding lines 9 have concavities alternating with each other on the inner and outer surfaces 61, 62. Specifically, the film 6 is pleated along the longitudinal direction X and is adapted to fold along the folding lines 9 to compact along the longitudinal direction X and pass from the extended configuration to the retracted configuration. In the case of a pleated shielding element 5, it can comprise cords in order to compact the film 6 along the folding lines 9.

[0072] According to another preferred embodiment of the invention, the roller 71 has a shape with polygonal section, defined by three or more edges 71a, as shown in Figures 2a, 2b, 3a and 3b.

[0073] In this embodiment, the film 6 is configured to be wound and / or unwound directly on / from the roller 71.

[0074] Preferably, the folding lines 9 are spaced apart so as to be positioned along the edges 71a of the roller 71 when the film 6 is wound around the roller 71. Preferably, the roller 71 has a pyramidal shape, as illustrated in Figures 3a and 3b. Still preferably, the edges 71a have the same length.

[0075] Advantageously, the use of a polygonal roller 71 allows to optimize the stability of the folding lines 9, which, once the film 6 is wrapped around the roller 71, are positioned along the edges 71a. Therefore, each time the film 6 is brought into the retracted configuration, the folding lines 9 are again marked, and do not flatten even after numerous cycles of use.

[0076] Alternatively, the roller 71 has a substantially cylindrical shape, as shown in Figures 4a and 4b.

[0077] According to an aspect, the shielding element 5 has a mass element 10, e.g., a weight, shown as a bar in the figures. The mass element 10 is placed at the free end 6a of the film 6, as illustrated in Figures lb, 2c, 3a, 3b, 4a and 4b. Such a mass element 10 allows a pulling force to be applied by gravity to the film 6 along the longitudinal direction X towards the bottom 22 of the insulating glazing unit 1, thus facilitating the passage of the shielding element 5 from the retracted configuration to the extended configuration. It should be noted that such a mass element 10 is particularly advantageous for the second embodiment of the present invention, wherein the shielding element is wound and / or unwound around the roller 71.

[0078] Advantageously, the shielding element 5 of the present invention, comprising a film 6, has the advantageous technical effect of limiting the overall thickness of the film 6 once it has been completely wound around the roller 71. In fact, with respect to the prior art in which the insulating glazing unit comprises blinds made of fabric, the insulating glazing unit 1 of the present invention, with the same thickness of the insulating glazing unit, is also applicable to windows of greater height.

[0079] Still advantageously, the aforementioned technical effect is further enhanced by a film 6 drilled by means of drilling with material removal. In fact, such a technique allows to avoid the accumulation of material on the edges of the holes 8 and thus limit the thickness of the film 6.

[0080] A further object of the present invention is a method for manufacturing an insulating glazing unit 1 according to the present description.

[0081] The manufacturing method comprises the step of providing a shielding element 5. It should be noted that the shielding element 5, in the moment when it is provided, is not yet provided with holes.

[0082] The method thus comprises the step of drilling the shielding element 5. It should be noted that the drilled shielding element 5 thus has any technical feature previously illustrated in the present disclosure. Preferably, the step of drilling the shielding element 5 comprises drilling the film 6 by means of a drilling technique with removal of material.

[0083] Preferably, the method comprises forming a plurality of folding lines 9 in the film 6. Preferably, such a step is carried out before drilling with removal of material. According to an aspect, the step of drilling the shielding element 5 comprises drilling the film 6 between one or more pairs of adjacent folding lines 9. It is thereby possible to obtain folding lines 9 without holes.

[0084] According to a further aspect, the step of drilling the shielding element 5 comprises drilling the film 6 according to predefined patterns or graphics.

[0085] The method therefore comprises providing a frame 2, a pair of plates 3, and collecting means 7 according to the present disclosure.

[0086] The method then comprises the step of constraining the collecting means 7 to the frame 2.

[0087] The method also comprises the step of engaging the shielding element 5 to the collecting means 7. Preferably, the aforesaid step comprises engaging the engagement end 6b of the film 6 to the collecting means 7.

[0088] The method then comprises the step of fixing the pair of plates 3 to the frame 2 so as to retain the collecting means 8 and the shielding element 5 inside the gap 4.

[0089] According to the preferred embodiment, the aforesaid steps are to be carried out according to the sequential order in which they were disclosed. Alternatively, the steps may be carried out according to a different temporal order.

Claims

CLAIMS1. An insulating glazing unit (1) comprising:- a supporting frame (2);- a pair of plates (3) which are at least partly transparent and fixed to the frame (2), said plates (3) being spaced apart to define a gap (4);- a shielding element (5) arranged inside the gap (4), the shielding element (5) comprising a film (6) having a free end (6a) and an opposite engagement end (6b),- collecting means (7) constrained to the frame (2) and arranged in the gap (4), the engagement end (6b) of the film (6) being engaged with the collecting means (7), wherein the collecting means (7) are adapted to switch the shielding element (5) at least between an extended configuration and a retracted configuration, the free end (6a) of the film (6) being closer in a longitudinal direction (X) to the collecting means (7) in the retracted configuration with respect to the extended configuration, wherein the film (6) has a plurality of folding lines (9) spaced apart along the longitudinal direction (X), characterised in that the shielding element (5) is provided with a plurality of through holes (8) distributed on the film (6).

2. An insulating glazing unit (1) according to claim 1, wherein a coverage ratio between the sum of each hole surface (8a) of a respective hole (8) and a surface of the film (61) is comprised between 0.01 and 0.3, more preferably 0.1.

3. An insulating glazing unit (1) according to claim 1 or 2, wherein the holes (8) are distributed on the film (6) between one or more pairs of adjacent folding lines (9), the folding lines (9) being devoid of holes (8).

4. An insulating glazing unit (1) according to any one of the preceding claims, wherein the collecting means (7) comprise a roller (71) configured to rotate around a rotation axis (R) to wind and / or unwind the shielding element (5) between the retracted configuration and the extended configuration.

5. An insulating glazing unit (1) according to claim 4, wherein the roller (71) has a polygonal shape defined by three or more edges (71a), the folding lines (9) being spaced from each other so as to be positioned along the edges (71a) of the roller (71).

6. An insulating glazing unit (1) according to any one of the preceding claims, wherein the film (6) of the shielding element (5) is pleated along the longitudinal direction (X), the film (6) being configured to fold along the folding lines (9) and compact along the longitudinal direction (X) to pass from the extended configuration to the retracted configuration.

7. An insulating glazing unit (1) according to any one of the preceding claims, wherein each hole (8) has a characteristic dimension less than 2 mm, preferably between 0.8 and 1 mm, each hole (8) being spaced from one or more adjacent holes by an interaxis distance comprised between 1.5 mm and 10 mm, preferably between 2.5 and 6 mm.

8. An insulating glazing unit (1) according to any one of the preceding claims, wherein the film (6) of the shielding element (5) has a layer of reflective material (60) on a surface of the film (6) facing towards the exterior of an environment of a building, thelayer of reflective material preferably being obtainable by means of PVD or thermovaporization.

9. An insulating glazing unit (1) according to any one of the preceding claims, wherein the shielding element (5) is made of polymeric material, preferably polyester.

10. An insulating glazing unit (1) according to any one of the preceding claims, wherein the holes (8) of the shielding element (5) are obtainable by means of a drilling technique with removal of material, in particular by means of rotating tips.

11. Method for manufacturing an insulating glazing unit (1) according to any one of claims 1 to 10, wherein the holes (8) of the shielding element (5) are obtainable by means of a technique of cold drilling, hot needle drilling, or laser drilling, preferably cold drilling by means of rotating tips or step cutting.

12. Method for manufacturing an insulating glazing unit (1) according to any one of claims 1 to 11, comprising the steps of:- providing a shielding element comprising a film (6);- drilling holes in the film (6) and forming folding lines in the film (6), preferably the holes (8) being distributed on the film (6) between one or more pairs of adjacent folding lines (9) and not at the folding lines (9);- providing a frame (2), a pair of plates (3), and collecting means (7);- constraining the collecting means (7) to the frame (2);- engaging the shielding element (5) to the collecting means (7);- fixing the pair of plates (3) to the frame (2), so as to retain the collecting means (7) and the shielding element (5) inside a gap (4) defined between the plates (3).

13. Method according to claim 12, wherein the step of drilling the film (6) comprises drilling the film (6) by means of drilling with the removal of material.

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