Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
  • E04D3/24—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like
  • E04D3/30—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like of metal
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
  • E04D3/02—Roof covering by making use of flat or curved slabs or stiff sheets of plane slabs, slates, or sheets, or in which the cross-section is unimportant
  • E04D3/16—Roof covering by making use of flat or curved slabs or stiff sheets of plane slabs, slates, or sheets, or in which the cross-section is unimportant of metal

Definitions

• the present invention relates to a roof comprising a covering support on which a cover is laid, the cover comprising an assembly of sheets of zinc or galvanized steel having one side facing said support, said side being provided with a organic coating.
• Zinc covers are traditionally placed on ventilated fir supports. AT because of the high cost of this traditional support, we are looking to replace it with supports cheaper, in particular non-ventilated supports possibly not compatible with the zinc or galvanized steel such as particle board, plywood, concrete and rigid insulation. However, many corrosion phenomena of zinc coverings have been reported on these non-ventilated supports. To solve these problems it would be necessary, according to document EP-B-0410822, to improve the ventilation between the support of cover and zinc plates to avoid condensation and to isolate the zinc from the support non-ventilated, especially if the support is made of concrete.
• the object of the present invention is to provide a blanket as defined above, which avoids the disadvantages mentioned above.
• said support is non-ventilated and said covering has a thickness of 50 to 150 micrometers, is elastic, durable and waterproof to water vapor, the other side of the sheets being either uncoated or coated by any surface treatment process applied for purely aesthetic purposes.
• the coating quality it is highly recommended that it be applied continuously, in particular between a unwinding station and a winding station, at the zinc sheet producer or in a workshop specializing in application of coatings; the elasticity of the coating must therefore be such that the coated sheet can undergo, on the site or in the workshop of the roofer-zinc-worker, the shaping operations necessary for its installation without the coating being damaged. It is obvious that the coating must be hard enough so that the various manipulations, that the coated sheet must undergo until it is finally placed on the support, do not leave traces in the coating or in any case not deep traces. The thickness of at least 50 micrometers is essential to avoid for sure that possible small scratches undergone as a result of the above manipulations can not discover zinc.
• the coating cannot crack or flake, as it is essential that it remains waterproof to water vapor. It should be noted here that there is a perfect synergy between the zinc sheet and its coating in the sense that they protect each other against the worst of their respective enemies, namely ultraviolet radiation in the case coating and condensation in the case of zinc or galvanized steel.
• Document DE-A-3444669 describes strips of plastic covering of a thickness of about 5 mm, protected by a metallic film of about 0.05 mm on the face outside.
• the metallic film protects the synthetic material from atmospheric influences and also plays an aesthetic role.
• the document recommends a flexible synthetic material and foamy such as polyethylene or expanded polyurethane to promote insulation thermal and sonic; the metallic film can be copper, stainless steel or alloys based on aluminum. This document does not address the issue of ventilation of the media. roofing.
• Document FR-A-2471859 describes a metal sheet with composite coating for use in the production of exterior building materials.
• This sheet metal carries a coating of a composition containing a chloride resin polyvinyl, a powdered metal, a plasticizer and a stabilizing agent, this product having a excellent resistance to atmospheric factors, as shown by a test of accelerated aging entitled "Sunshine Weather Meter Test".
• galvanized sheets covered with either a layer of resin-based paint thermosetting, either a polyvinyl chloride film and / or polyacrylate do not not always suitable from an economic point of view and as regards their resistance for the production of exterior building materials.
• the coating may consist of a layer of paint based on polyester (standard symbol: SP), silicone polyester (SPSI), polyester polyamide (SPPA), epoxy (EP), polyurethane (PUR), polyvinylidene fluoride (PVDF) organosol chloride vinyl (PVCO), vinyl chloride plastisol (PVCP), acrylic (AY) or silicone acrylic (AYS), the thickness of the layer in the dry state being advantageously from 50 to 70 micrometers.
• the painting is advantageously carried out continuously at the sheet producer or in a painting workshop by depositing the paint in liquid or powder form and baking subsequent by passage through an oven. Preference is given to polyester paint deposited in powder form. Such a paint is marketed under the name "Beckryspeed®" by the firm BICHON S.A.
• the coating can also consist of an adhesive film of polyvinyl chloride (PVCF), polyvinyl fluoride (PVFF), acrylic (PMMAF), polyethylene (PEF), polyurethane or polyester, the thickness of the film advantageously being from 80 to 150 micrometers.
• PVCF polyvinyl chloride
• PVFF polyvinyl fluoride
• PMMAF acrylic
• PETF polyethylene
• polyurethane polyurethane
• polyester polyurethane or polyester
• the thickness of the film advantageously being from 80 to 150 micrometers.
• the application of film is advantageously carried out continuously by the sheet producer. Preference is granted to polyethylene film.
• An example of such a film is the low polyethylene adhesive film. density with a thickness of 100 micrometers, which is sold under the reference 4118 by NOVACEL S.A. for economic reasons, adhesive film coating is prefer to paint coating.
• the coating can also consist of a layer of paint as defined above, which is itself covered with an adhesive film as defined above. Needless to say, such coating is even more effective than coating with paint or adhesive film.
• the other side of the sheet is either uncoated or coated with any surface treatment process applied for purely aesthetic purposes. This is how example that this face can be prepatinated.
• the present invention also relates to the use of zinc or steel sheets galvanized, one side of which is provided with a coating as defined and described above and of which the other side is either uncoated or coated for purely aesthetic purposes, for the realization of the cover according to the invention, this embodiment comprising the operations of shaping the sheets necessary for their laying and the laying proper of the shaped sheets.
• the shaping and laying of coated sheets, supplied by the sheet producer, can be do according to current practice.
• a roll of rolled zinc is unwound on a line of finishing together with a roll of plastic film of the same width which includes one side covered with adhesive.
• the film After unwinding, the film is plated on the rolled zinc by means of a set of rollers pressers and the whole is rewound into a reel. This coil will then be cut into width and length suitable for use on construction sites.
• the thickness of zinc is that commonly used for roofing, between 0.65 and 1 mm.
• the plastic film is made of low density polyethylene 100 micrometers thick.
• the adhesive is a mixture of rubber and resin 10 micrometers thick.
• Zinc samples coated with the film were placed in an oven, at 100 ° C. for 6 months, either at 70 ° C for 8 months, or at 40 ° C for 15 months, durations which correspond to more than 10 years of real site exposure on a cover.
• Zinc samples coated with the film were placed in an oven for 60 days, ie at 90 ° C. either at 100 ° C. Beforehand we made folds and stampings on the samples to simulate the deformations that the product will undergo on a site.
• Film coated zinc samples underwent temperature cycles from -20 ° C to + 90 ° C to simulate in real time what is actually happening on a blanket. After 300 cycles (1400 hours) it can be seen that the film has remained well adhered. After 5 days of Kestemich trial (5 cycles) it is noted after removal of the film that the protected face is not corroded then that the other is excessively.
• a zinc coil After rolling, a zinc coil is subjected to a surface treatment operation by conversion, giving on both sides a surface layer of zinc phosphate, i.e. light gray in color, or dark gray in color, the zinc thus obtained being called prepatinated zinc.
• the pre-patinated zinc is rewound into a coil.
• the pre-weathered zinc coil undergoes the same operations as the rolled zinc coil in Example 1 and the material thus obtained is subjected to the same tests as the material obtained in example 1: the same results are obtained as in example 1.
• the zinc coil coated with example 1 was used to make a cover above a room in which water vapor has been produced.
• the interior of the room is maintained at 30 ° C with a relative humidity of 100% and its walls are thermally insulated so that moisture condenses preferentially on the face rolled zinc protected by the film.
• a roll of rolled zinc is unwound at a speed of 5m / min on a lacquering installation including a surface preparation station (degreasing, chemical conversion, rinsing, drying), a powder coating booth with powder guns for depositing on a face of rolled zinc a layer of more than 50 micrometers of powder, a polymerization oven at 250 ° C, a cooler and a rewinder. This coil will then be cut into width and length suitable for use on construction sites.
• the thickness of rolled zinc is that commonly used for roofing, between 0.65 and 1 mm.
• the powder is a "Beckryspeed®" polyester powder specially made to combine the performance and benefits of powder to continuous application technology. The following tests confirm the good performance of the coating. They were carried out on flat test pieces with a coating of 60 micrometers, including an Erichsen stamping according to ISO 1520, an impact stamping according to ISO 6272, and an OT fold on a side.
• test pieces underwent the accelerated salt spray corrosion test according to the NFX standard. 41002 for 1000 hours. After the test, it is found that the appearance of the coating has not been modified, even on deformed areas, when the unprotected side has been excessively corroded.
• test pieces underwent the Kestemich test, according to DIN 50017 for 1000 hours (42 cycles). After the test, it can be seen that the appearance of the coating has not been changed, even on the deformed areas, while the unprotected face has been uniformly corroded by the condensation, by the formation of white rust.
• Example 4 The operations and tests of Example 4 are repeated, but starting this time with a coil of pre-patinated zinc and the same results are obtained as in Example 4.
• Example 4 The operations and tests of Example 4 are repeated, but in the powder installation, between the cooler and the rewinder, an adhesive film is continuously deposited on the coated side low density polyethylene 50 microns thick. We get the same results as in example 4.
• Example 6 The operations and tests of Example 6 are repeated, but starting this time with a coil of pre-patinated zinc. The same results are obtained as in Example 4.
• Example 3 The operations of Example 3 are repeated, but this time using the coated zinc coil of example 4. We arrive at the same result as in example 3.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Laminated Bodies (AREA)
• Glass Compositions (AREA)
• Roof Covering Using Slabs Or Stiff Sheets (AREA)
• Non-Insulated Conductors (AREA)
• Primary Cells (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Electroplating And Plating Baths Therefor (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)
• Electroplating Methods And Accessories (AREA)
• Coating With Molten Metal (AREA)
• Physical Vapour Deposition (AREA)
• Building Environments (AREA)
• Arc Welding In General (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

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Family Applications (1)

Country Status (17)

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• 1994
  • 1994-12-23 FR FR9415568A patent/FR2728604A1/fr active Granted
• 1995
  • 1995-12-07 ES ES95942113T patent/ES2133178T3/es not_active Expired - Lifetime
  • 1995-12-07 DK DK95942113T patent/DK0804659T3/da active
  • 1995-12-07 HU HU9702105A patent/HU220542B1/hu not_active IP Right Cessation
  • 1995-12-07 DE DE69508437T patent/DE69508437T2/de not_active Expired - Lifetime
  • 1995-12-07 EP EP95942113A patent/EP0804659B1/fr not_active Expired - Lifetime
  • 1995-12-07 AU AU43430/96A patent/AU4343096A/en not_active Abandoned
  • 1995-12-07 JP JP52015196A patent/JP3803778B2/ja not_active Expired - Fee Related
  • 1995-12-07 CN CN95197622A patent/CN1079476C/zh not_active Expired - Lifetime
  • 1995-12-07 SK SK822-97A patent/SK284822B6/sk not_active IP Right Cessation
  • 1995-12-07 AT AT95942113T patent/ATE177810T1/de active
  • 1995-12-07 PL PL95320788A patent/PL320788A1/xx unknown
  • 1995-12-07 WO PCT/EP1995/004886 patent/WO1996020320A1/fr active IP Right Grant
  • 1995-12-07 CZ CZ19971949A patent/CZ287617B6/cs not_active IP Right Cessation
• 1997
  • 1997-06-20 NO NO19972918A patent/NO310118B1/no not_active IP Right Cessation
• 1998
  • 1998-07-16 HK HK98109207A patent/HK1008232A1/xx not_active IP Right Cessation
• 1999
  • 1999-06-10 GR GR990401578T patent/GR3030503T3/el unknown

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