HDF with plywood or blockboard sandwich panels

mdf+blockboardProduction of high quality door profiles and door components can be obtained with a sandwich panel, combining 2 or 3 plies of high density fiberboard (HDF) and plywood or blockboard as the core material.

This kind of board can guarantee high stability and moisture resistance, high bending strength and light weight.

The most common sandwich panels are made with a 3-ply construction, for example:
– about 13 mm HDF
– about 14 mm blockboard core or poplar plywood
– about 13 mm HDF
The inner core is produced by calibrating the blockboard cores (spruce, pine and poplar are the most common timbers used), so that there’s no significant thickness tolerance in single staves, and the final board is free from gaps.
In other applications, the core is made with poplar plywood with standard cross-banded veneer composition, or also with all veneers in the same long-grain direction.

The size of sandwich panels varies according to the specific market, however, the most common sizes are:
– 2200×1220 mm
– 2200×1260 mm
– 3050×1220 mm
in 40 mm and 44 mm thickness.
It is also possible to order products that are cut to size.

Bonding of the faces is made with urea-formaldehyde glue (UF) (formerly called IF20), while the lumber core is bonded with PVAc (D3), in compliance with the provisions of the EN 314 standard.
After suitable treatment in view of resistance to humidity, the board complies to Class 1 requirements for the use of boards in dry environments (EN 636-1).
Class 2 (formerly called AW100 or MR) can also be produced upon request.
Formaldehyde emissions are below those established for Class E1 in conformity with the EN 636 standard. The low-emission class E1 panels do not cause a concentration of equilibrium in the air of the test chamber (defined in the EN 717-1 standard) greater than 0.1 ppm, the limit established by the World Health Organization for living and residential environments.

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