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
  • E04D3/02—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
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
  • E04D5/04—Roof covering by making use of flexible material, e.g. supplied in roll form by making use of metal foils

Definitions

• the present invention relates to copper sheeting for building purposes, and parti­cularly, although not exclusively, to copper sheeting for use as roofing material.
• Copper sheeting used hitherto for building purposes has the form of a rolled and annealed sheet product (Swedish Standard SS 14 50 13).
• the sheet is rolled from electrolytically produced cathode copper, or from some other refined copper product, which is first remelted and cast to form an ingot and then rolled, in several stages, while in a hot state, at least initially, to the desired thickness, normally 0.6-0.7 mm, whereafter the sheet is annealed, at least in the majority of cases.
• cathode copper or electrolytic copper as designated according to Swedish Standards, is meant here and in the following the refined copper product obtained when raw copper, so-called anode copper, is refined by conventional electrolytic processes. During this electrolytic refine­ment of the raw copper, the cathode copper is precipitated on mother plates in the form of cathodes placed between anodes of the copper to be refined in the electrolytic cell (anode copper).
• the sheeting is not delivered to the building site in the large rolls into which it is wound when leaving the rolls of the rolling mill, but more often in the form of separate pieces having lengths/widths of 2 m x 1 m.
• Copper is a highly useful building material, since it is impervious to water, has practically unlimited durability and has an aesthetically pleasant surface colour­ing.
• an electrolytically formed product comprising a sheet of non-remelted cathode or electrolytic copper produced in a limited dimension suitable for direct use.
• the sheet has a thickness of 0.5-1 mm, preferably 0.6-0.8 mm, and a length­/width of about 1 m x 1 m.
• the sheets are manufactured by conventional electrolytic copper refining tech­niques.
• the electrolytic tanks used have a depth which is roughly twice that of conventional tanks, and the dimensions of the anodes and mother plates are adapted accordingly.
• the cathodic copper product is preferably precipitated onto mother plates made of titanium or stainless steel to the thickness desired, and then stripped therefrom manually or mechanically in a conventional manner.
• the mother plates preferably have a length/width of 200 cm x 100 cm and are suspended "on end" in the electrolytic bath.
• the distance between the electrodes may be of the same order of magnitude as that applied with conventional, smaller electrodes, since longer electrodes tend to hang more vertically.
• the surfaces of the resultant cathodic copper sheet, or plate are rougher than the surface of rolled sheet, although this is more of an advantage than a disad­vantage in the case of roofing sheets, since rough copper sheeting obtains the desired green patina much more quickly than rolled plate.
• the sheets may be cold-rolled in one or two cold-rolling stages, therewith also increasing the mechanical strength properties of the sheeting at the same time.
• the mechanical properties of the electrolytically formed sheeting are sufficiently high, however, in the absence of such subsequent treatment, as illustrated hereinafter in the following working example, in which the properties of electrolytically produced sheeting are compared with industrial standards for copper-roof sheeting.
• Copper sheeting was produced electrolytically in dimensions of 1000 x 1000 x ⁇ 0.7 mm. Tensile tests, hardness tests, bending tests, and to-and-­from bending tests (reverse bending) were carried out in accordance with stan-­dardized methods on samples taken from the copper sheet, these samples com­prising seven tensile-test rods (sheet sample rods type F) according to SS 11 21 16 and 40 sample rods 100 x 20 x 0.7 mm for bending and reverse bend­ing tests. Prior to carrying out the tests, half of the sample rods used were hard­ened at 200°C for two hours in an N2 atmosphere.
• the hardness test was carried out in accordance with SS 11 25 17 (Vickers test HV 0.5 ), on the heads of the tensile rods subsequent to negligible polishing of the surfaces.
• the example shows that the mechanical properties of copper sheeting, or plate, according to the invention, which sheeting can be produced much more simply and therewith much more cheaply than conventional copper roofing sheet, are well on a par with conventional copper roofing sheet.
• the elongation limit and the ultimate tensile strength of the inventive product are fully comparable with those of annealed, rolled copper sheet or plate (5013-02), while the elongation values A 50mm and A5 lie inbetween the annealed and cold-worked state (5013-04).
• the hardness HV 0.5 is comparable with that of 5013-04.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Electrolytic Production Of Metals (AREA)
• Laminated Bodies (AREA)
• Chemical Treatment Of Metals (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20361413

Family Applications (1)

Country Status (7)

Citations (2)

• 1985
  • 1985-09-16 SE SE8504287A patent/SE8504287L/ not_active Application Discontinuation
• 1986
  • 1986-09-08 GR GR862291A patent/GR862291B/el unknown
  • 1986-09-10 ES ES8601770A patent/ES2000883A6/es not_active Expired
  • 1986-09-12 FI FI863698A patent/FI863698A/fi not_active Application Discontinuation
  • 1986-09-15 NO NO863679A patent/NO863679L/no unknown
  • 1986-09-15 EP EP86850309A patent/EP0215763A1/de not_active Withdrawn
  • 1986-09-16 DK DK443486A patent/DK443486A/da not_active Application Discontinuation

Patent Citations (2)

Non-Patent Citations (1)

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