AS NZS 1859.3:2017 pdf free download – Reconstituted wood-based panels—Specifications Part 3: Decorative overlaid wood panels

AS NZS 1859.3:2017 pdf free download – Reconstituted wood-based panels—Specifications Part 3: Decorative overlaid wood panels.
6.1 GENERAL REQUIREMENTS
6.1.1 Veneer
The veneer shall comply with the following requirements (see Clause 6.1.3):
(a) Each piece of veneer leaf shall be of sound timber, smoothly and tightly cut to a uniform thickness. Veneer thickness shall be 0.5 mm to 0.7 mm or as agreed between purchaser and supplier.
NOTE: Eucalyptus species often have gum veins and pin holes as an acceptable feature.
(b) Veneer leaf moisture content shall be in the range of 6% to 12% prior to making up into lay-on and also prior to pressing onto the substrate.
(c) Veneer leaf shall he cut such that the long edges or edges parallel to the grain are parallel and clean cut. Leaf shall be edge butt joined by suitable means to form a lay- on of the required grain pattern and dimensions.
NOTE: A veneer lay-on is made up of a numbcr of pieces of veneer Icaf, suitably matchcd for figure and colour according to purchaser requircmcnts.
6.1.2 Panel forms
Veneer panels may be manufactured in various forms based on veneer grades and end usc requirements, as specified in Table 6.1.
6.1.4 Backing grade seneers
Backing grade veneers may be of lower quality than face grade vencers. The following imperfections are permitted:
(a) Minor open joints, overlaps, knots. knotholes, splits and mismatching.
(b) Mild discolouration.
(c) Natural blemishes such as gum veins and knots.
(d) Other minor faults that do not impair the integrity of the veneer.
NOTE: Patching of open defects with a suitable tiller of matching colour can be arranged subject to agreement between supplier and purchaser.
6.1.5 Adhesic
Adhesive used to bond the veneer to the substrate shall comply with the requirements of AS/N7.S 4266.2 and with the bond durability requirements according to the substrate specified,
6.1.6 Construction
Veneered panels shall be constructed as follows:
(a) Veneered panels shall be balanced, that is, generally the same species and thickness of veneer shall be applied to both sides.
There may be occasions where purchasers’ requirements call for differing species on the face and back. These cases shall be subject to consultation and agreement between purchaser and supplier.
(b) The grain of the veneer shall be generally parallel to the long edges of the panel. There will be exceptions to this according to purchasers’ requirements, e.g. diagonal and cross grain panels. In these cases, grain direction should he the same on both sides where possible.
6.1.7 Finish
Where trimmed, edges shall be clean cut and square to the surface. Sanded finish shall he equivalent to 150 grit or higher.
NOTE: Unsanded and untrimmed veneer panels may be supplied subject to agreement between the purchaser and supplier.
6.2 GLUE SPREAL)
Glue spread shall he continuous over the whole surface.
6.3 VENEER BOND STRENGTH
When determined in accordance with AS/NZS 4266.2. Veneer bond strength shall he considered satisfactory provided that—
(a) failure occurs in the veneer or
(b) failure load exceeds requirements of Table 6.2.
6.4 VENEER BOND l)URABIIITY
When determined in accordance with AS/NZS 4266.2, Veneer bond durability is considered satisfactory if, on visual examination, there is no separation of the veneer from the substrate (see Table 6.2).