Under-roof screen and manufacturing process

Abstract

ROOF UNDERLAYMENT AND MANUFACTURING METHOD The invention relates to a roof underlayment (100) comprising a first metallic layer (102) having an inner face (102a) and an outer face (102b) and perforated (102c), a second breathable and waterproof layer (104) with a second face (104b) bonded to the inner face (102a) of the first layer (102), and a third resistant layer (106) with a second face (106b) bonded to a first face (104a) of the second layer (104), wherein the perforation of the first layer (102) is made prior to bonding the first layer (102) to the second layer (104), by penetration of points from the inner face (102a) to the outer face (102b). Fig. 2

Description

Title of the invention: ROOF UNDERCOVER AND METHOD OF MANUFACTURING Technical field

[0001] The present invention relates to a roof underlayment and to a method of manufacturing such a roof underlayment. STATE OF THE PRIOR ART

[0002] A roof underlay typically comprises a first layer made of a metallic material, and different layers which are glued successively from one face of the first layer.

[0003] The first layer and possibly other layers are perforated to create a waterproof and breathable screen.

[0004] Even if such an under-roof screen is efficient, it may happen that the microperforations are not optimal and breathability is degraded. Statement of the invention

[0005] An object of the present invention is to provide a roof underlayment whose breathability is guaranteed.

[0006] For this purpose, a roof underlay is proposed comprising:

[0007] - a first layer made of a metallic material having an in face inner and an outer face crossed by perforations,

[0008] - a second layer made of a breathable and waterproof material and having a first face and a second face glued to the inner face of the first layer, and

[0009] - a third layer made of a third resistant material and having a first face and a second face bonded to the first face of the second layer,

[0010] where the drilling of the first layer is carried out prior to bonding the first layer with the second layer, by penetration of points from the inner face towards the outer face.

[0011] Advantageously, the first layer is an aluminum sheet.

[0012] Advantageously, the second layer is a layer containing calcium carbonate mixed with polyethylene and / or polypropylene.

[0013] Advantageously, the third layer is a coating of glass fibers.

[0014] Advantageously, the diameter of the perforations is 0.125 ± 0.02 mm for a density of 80 perforations per cm2.

[0015] The invention also proposes a method of manufacturing a roof underlay according to one of the preceding variants, characterized in that it comprises:

[0016] - a step of providing a first layer made of a metallic material and having an inner face and an outer face,

[0017] - a step of perforating the first layer by penetration of points from the inner face to outer face,

[0018] - a step of providing a second layer made of a breathable material and waterproof and having a first face and a second face,

[0019] - a first bonding step during which the second face of the second layer is glued to the inner face of the first layer,

[0020] - a step of providing a third layer made of a resistant material and having a first face and a second face, and

[0021] - a second bonding step during which the second face of the third layer is glued to the first face of the second layer. Brief description of the drawings

[0022] The above-mentioned features of the invention, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the attached drawings, among which:

[0023] [Fig-1] is an enlargement of a section of a perforated metal sheet implemented in a roof underlay according to the invention, and

[0024] [Fig.2] is a schematic representation of a roof underlayment according to the invention.

[0025] DETAILED DESCRIPTION OF EMBODIMENTS

[0026] [Fig. 1] represents a first layer 102 made of a metallic material, and in particular takes the form of an aluminum sheet. The first layer 102 is implemented in a roof underlay 100 represented in [Fig. 2].

[0027] The first layer has an inner face 102a and an outer face 102b and is crossed by perforations 102c.

[0028] The under-roof screen 100 also comprises a second layer 104 made of a breathable and waterproof material and having a first face 104a and a second face 104b bonded to the inner face 102a of the first layer 102. A material is waterproof and breathable when it ensures impermeability to water and permeance to water vapor.

[0029] The under-roof screen 100 also comprises a third layer 106 made of a third resistant material and having a first face 106a and a second face 106b bonded to the first face 104a of the second layer 104.

[0030] When installing the under-roof screen 100 under a roof of a building, the first layer 102 is oriented towards the roof, i.e. towards the outside of the building, while the third layer 106 is oriented towards the inside of the building.

[0031] The first layer 102 serves as a reflective thermal barrier to the heat ex- interior wanting to enter the building.

[0032] To make the perforations 102c prior to bonding the first layer 102 with the second layer 104, points 50 penetrate into the first layer 102 from the inner face 102a towards the outer face 102b.

[0033] According to a particular embodiment, the first layer 102 passes between a first rigid roller 52a carrying the spikes 50 and a second flexible roller 52b. When the first layer 102 passes between the rollers, the inner face 102a is pressed against the first roller 52a and the outer face 102b is pressed against the second roller 52b.

[0034] With such an arrangement, each tip 50 pierces the first layer 102, forming a tube 110 which generally has the shape of a volcano with a wider base on the side of the inner face 102a and a narrower top on the side of the outer face 102b. The tube 110 thus has at its base, a lower orifice 110a, and at its top an upper orifice 110b and a channel 110c between the two orifices HOa-b. The lower orifice 110a has a diameter greater than the diameter of the upper orifice 110b.

[0035] Due to the presence of the lower orifice 110a with a larger surface area facing the second layer 104, the breathability of the under-roof screen 100 is improved compared to a reverse installation where the smaller diameter orifice is towards the second layer 104.

[0036] During manufacturing by passing between the rollers, a depression 112 is formed around the tubing 110 by depression of the outer face 102b.

[0037] According to a particular embodiment for obtaining a waterproof under-roof screen 100 on the side of the first layer 102 and breathable, the diameter of the upper orifice 110b of each perforation 102c is 0.125 ± 0.02 mm and for a density of 80 perforations 102c per cm2.

[0038] According to a particular embodiment, the second layer 104 is a layer containing calcium carbonate mixed with polyethylene and / or polypropylene. This second layer 104 is produced for example by stretching in order to produce a network of micro-channels allowing water vapor to pass through.

[0039] According to a particular embodiment, the second layer 104 is a breathable layer based on polyethylene or polypropylene of the Aptra 715© or Aptra W type 40001© type from the company RKW©.

[0040] According to a particular embodiment, the third layer 106 is a covering of woven or non-woven glass fibers, such as a tablecloth or a fabric.

[0041] The bonding of the different layers 102, 104 and 106 together can be carried out by heat bonding. For example, polyethylene can be used to constitute the glue between the different layers 102, 104 and 106.

[0042] The different layers are stored in the form of rolls and a method of manufacturing the under-roof screen 100 comprises:

[0043] - a step of providing the first layer 102,

[0044] - a step of perforating the first layer 102 by penetration of points 50 from the inner face 102a to the outer face 102b,

[0045] - a step of providing the second layer 104,

[0046] - a first bonding step during which the second face 104b of the second layer 104 is bonded to the inner face 102a of the first layer 102,

[0047] - a step of providing the third layer 106, and

[0048] - a second bonding step during which the second face 106b of the third layer 106 is bonded to the first face 104a of the second layer 104.

Claims

Demands

1. Underlayment (100) comprising: - a first layer (102) made of a metallic material having an inner face (102a) and an outer face (102b) and through perforations (102c), - a second layer (104) made of a material ensuring water impermeability and water vapor permeance and having a first face (104a) and a second face (104b) bonded to the inner face (102a) of the first layer (102), and - a third layer (106) made of a third material constituting a woven or non-woven glass fiber coating and having a first face (106a) and a second face (106b) bonded to the first face (104a) of the second layer (104), where each perforation (102c) of the first layer (102) takes the form of a tube (110) with a wider base on the inner face side (102a) and a narrower apex on the outer face side (102b),where the tubing (110) has, at its base, a lower orifice (110a), and at its apex, a higher orifice (110b), and where the lower orifice (110a) has a diameter greater than the diameter of the upper orifice (110b).

2. Underlayment screen (100) according to claim 1, characterized in that the first layer (102) is an aluminium sheet.

3. Underlayment screen (100) according to any one of claims 1 or 2, characterized in that the second layer (104) is a layer containing calcium carbonate mixed with polyethylene and / or polypropylene.

4. Underlayment screen (100) according to any one of claims 1 to 3, characterized in that the diameter of the perforations (102c) is 0.125 ± 0.02 mm for a density of 80 perforations (102c) per cm2.

5. A method for manufacturing a roofing underlayment (100) according to any one of claims 1 to 4, characterized in that it comprises: - a step of supplying a first layer (102) made of a metallic material and having an inner face (102a) and an outer face (102b), - a step of perforating the first layer (102) by penetrating points (50) from the inner face (102a) to the outer face (102b), where each perforation (102c) of the first layer (102) takes the form of a tube (110) with a wider base on the inner face (102a) and a narrower apex on the outer face (102b), where the tube (110) has at its base a lower orifice (110a), and at its apex a higher orifice (110b), and where the lower orifice (110a) has a diameter greater than the diameter of the upper orifice (HOb), - a step of supplying a second layer (104) made of a material ensuring impermeability to water and permeability to water vapor and having a first face (104a) and a second face (104b), - a first bonding step during which the second face (104b) of the second layer (104) is bonded to the inner face (102a) of the first layer (102), - a step of supplying a third layer (106) made of a material constituting a woven or non-woven glass fiber coating and having a first face (106a) and a second face (106b), and - a second gluing step during which the second face (106b) of the third layer (106) is glued to the first face (104a) of the second layer (104).

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