Dibond

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Construction board made of Dibond
Composite material with a photo laminated on it
Construction site board made of Dibond, detailed view

Dibond is a brand for a rigid composite material. The brand belongs to the manufacturer 3A Composites , Singen . Dibond consists of two 0.3 millimeter thick aluminum layers that are thermally bonded to a polyethylene core. Therefore, Dibond is lighter than aluminum with the same overall thickness.

use

Dibond can be used for large format photo prints, both directly printed and laminated . Due to the low weight and high stability of the material, photo prints on Dibond are often used for traveling exhibitions , but also for construction boards. With a direct print on Alu-Dibond, however, luminosity is lost and the image becomes darker compared to a print on a white background. This does not apply if the FineArtPrint is initially made on paper and the layers are subsequently laminated together.

The wall of telephone booths of the Austrian Post from the 1980s consists of approximately 7 mm thick, colorless anodized composite panels, the windows are fitted with rubber seals.

properties

Cover sheets made of AlMg1 alloy, sheet thickness 0.3 mm each. Middle layer made of black polyethylene type LDPE.

  • Total plate thickness = 2–6 mm
  • Width = typically 1.25–1.50 m
  • Length = typically 2.5-4.05 m
  • Dibond - with 0.3 mm thickness of the coated aluminum sheet, core PE.
    • Total thickness: 2, 3, 4 and 6 mm.
    • Basis weight: 2.9, 3.8, 4.75 or 6.6 kg / m 2 .

In addition, there is also a Dibond digital variant with cover sheets that are only 0.2 mm thick

Dibond FR with a mineral core without halogenated flame retardants has a fire classification B-s1, d0 according to EN 13501.

Compared to solid aluminum, aluminum-plastic-aluminum panels have different properties:

  • rather cheaper
  • lighter - with the same overall thickness
  • stiffer - with the same basis weight
  • less booming, for example when raindrops hit or exposure to wind
  • rather more impact-resistant when subjected to blunt loads, such as a punch or a kick
  • largely devalued as scrap metal for aluminum recovery
  • With the reduced scrap value, the risk of theft from this motif is reduced

Dibond is produced in different surface qualities:

  • Butler finish - looks brushed, but is rolled and clear stove enamel
  • Dibond digital - coated for digital printing with inks
  • Dibond decor - wood look
  • Dibond mirror - superficially reflective
  • Dibond structure - black or silver, textured paint; haptically felt
  • Dibond anodized - 5 or 10 μm thick anodized; hard surface

Alternatively with a mineral core:

  • Dibond FR - fire classification "flame retardant"

Similar to Reynobond

Dibond panels are technically similar to Reynobond panels from Arconic (previously Alcoa ).

In architecture, the mechanically more stable Reynobond 55 panels are used in particular for ventilated facade cladding, and the lighter Reynobond 33 for displays, photo presentations and trade fair construction. The processing instructions from Alcoa name the following range of types:

  • Reynobond 33 - with 0.3 mm thickness of the coated aluminum sheet, PE core. Protective film on one side, transparent 0.035 mm.
    • Total thickness: 2, 3 and 4 mm
    • Basis weight: 2.90, 3.80 or 4.75 kg / m 2
  • Reynobond 55 - with 0.5 mm thickness of the coated aluminum sheet, PE core. One-sided protective film opaque, UV-opaque 0.080 mm.
    • Total thickness: 3, 4 and 6 mm
    • Basis weight: 4.59, 5.51 or 7.36 kg / m 2
  • Reynobond 55 - 4 mm (FR) - fire retardant
    • Basis weight: 7.50 kg / m 2

Plate length up to 6 m.

The temperature range for use is –50… + 80 ° C.

The coefficient of thermal expansion is calculated like that of aluminum: 2.36 × 10-5 m / ° C (0.0236 mm / m / ° C). Taking into account a temperature change of –20… 40 ° C, ie 60 K, the result is a change in length of 1.42 per thousand of the initial length, i.e. 8.52 mm for a 6 m long plate.

Before processing, panels should be brought to ambient temperature in order to avoid the formation of condensation and warping due to sides with different temperatures.

At the edges of the originally fabricated panel, the PE core can protrude or recede by up to 1.5 mm compared to the aluminum sheets.

Manufacturing tolerances for the width and length of the panels are around –0 / + 2 per thousand of the nominal size. The thickness of the 3 and 4 mm plates can vary by +/- 0.1 mm.

For processing, V-grooves with a flattened bottom can be milled on the back (non-visible side), leaving a thin PE covering of the lower aluminum layer, in order to bend the panel up to 135 ° along the groove.

See also

Web links

Commons : Dibond  - collection of images, videos and audio files

Individual evidence

  1. DIBOND® aluminum composite panels for indoor and outdoor use 3A Composites GmbH, accessed June 27, 2017.
  2. FR = fire retardent
  3. Reynobond processing Alcoa Architectural Products, Merxheim , F, baubook.at, accessed April 1, 2020 - PDF, 36 pp.