Triple-core poplar blockboard: bending strength and lightness

triple core poplar + HDF

triple core poplar blockboardWhen producing large-size sliding doors, dividers and partitioning, tables and bench tops, the risk of warping or bowing is very high.
The so-far unequalled solid wood solution, is triple-core poplar blockboard.
Triple-core blockboard is a special construction with 3-ply of cross-banded blockboard cores, overlaid by poplar veneer or thin HDF.
In comparison to any other kind of wood-based panel, this blockboard, available in the thicknesses between 36 mm and 60 mm, has superior bending strength, the lightness of Italian poplar timber (between 400 and 450 Kg/m3) and high screw-hold ability.

Trade names
Triplecore blockboard, Ecocore, lumber triple core plywood, triple core poplar board, cross-core poplar panel, 5‑ply Poplar Blockboard Panel, Pappeltischlerplatte, Staptischlerplatte, Stabpappelsperrholz, Stabilomassief, panneaux latté peuplier, alistonado de chopo, listellare pioppo tripla anima.

Construction
The triple-core poplar blockboard composition is a 5-ply construction. For example in 50 mm:
– about 2 mm poplar veneer cross grain (B)
– about 16 mm blockboard poplar core long grain (A)
– about 14 mm blockboard poplar core short grain (A)
– about 16 mm blockboard poplar core long grain (A)
– about 2 mm poplar veneer cross grain (B)

triple core blockboard

The poplar face is ideal for veneering. When the board is intended to be painted or laminated, the outer veneer is replaced by a 3 mm thin panel of HDF (high density fiberboard). This panel is called triple-core poplar blockboard + HDF.

triple core poplar + HDF
And for very special paintings applications, to reduce the consumption (and costs) of paint, the triple-core poplar blockboard + HDF is also available overlaid with a 240 gr/m2 lacquering paper.

triple core poplar + HDF + prime paper

Standard sizes
2200×2100 mm
2520×2100 mm
2600×2100 mm
2800×2100 mm
3100×2100 mm
3670×2100 mm
4200×2100 mm
2170×1870 mm
2520×1870 mm (*)
2600×1870 mm
2800×1870 mm (*)
3130×1870 mm
3670×1870 mm (*)
4200×1870 mm
3050×1300 mm
4200×1300 mm
(*) = most common size

Thickness
36, 38, 40, 44, 50, 60 mm
(thinner thicknesses are available with 3-ply or 5-ply construction)

Special sizes and thicknesses upon request.

Triple core blockboardUsing this product, veneered, laminated or lacquered, the leading Italian designer Mauro Lipparini and furniture manufacturer Misuraemme brought a real innovation in the concept of bookcases with the Crossing product line, a versatile modular system of panels to create wall shelving: the thickness (38 mm) and the bending strength and lightness of poplar blockboard, give the system a stability that allows you to hang the shelf directly on the wall with brackets, creating an unusual “visible lightness“.

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.

If you are looking for a reliable supplier of this product or you need more technical information, please contact me using the form on this page.

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Double-core blockboard, the thick lumber core

lumber core double core

Double core blockboardDouble-core blockboard is a special kind of construction to produce thick lumber core panels, generally in the thicknesses between 34 mm and 60 mm.
This kind of panel has superior bending strength, lightness and screw-hold ability in comparison to any other kind of wood-based panel.
While the most common application is door frames, it’s suitable for the production of high-quality door, tables, and structural furniture components like shoulders.

Trade names
Block board, lumber core, lumber core plywood, lumber core blockboard, commercial double core blockboard, double core board, double core ply board, double core prime block board, 5‑ply Blockboard Panel, Tischlerplatte, Staptischlerplatte, Stabsperrholz, panneaux latté, alistonado, listellare doppia anima.

Construction
The normal double-core composition is a 5-ply construction. For example in 50 mm:
– about 2 mm veneer cross grain (poplar or fromager) (B)
– about 22 mm blockboard core long grain (spruce, pine or poplar) (A)
– about 2 mm veneer cross grain (poplar or fromager) (B)
– about 22 mm blockboard core long grain (spruce, pine or poplar) (A)
– about 2 mm veneer cross grain (poplar or fromager) (B)

Double core blockboard draw

Most blockboard manufacturers worldwide are producing a 5-ply construction, while it’s also possible a 7-ply construction, with two veneers on each side, in order to achieve the best surface stability and flatness.

Standard sizes
1880×3140 mm
1880×3680 mm (*)
2070×2800 mm
2070×4200 mm
For door frames sizes, refer to this page
(*) = most common size

Thickness
34 to 60 mm
(thinner thicknesses are available with 3-ply or 5-ply construction)

Special sizes and thicknesses upon request.

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.

If you are looking for a reliable supplier of this product or you need more technical information, please contact me using the form on this page.

If you want to improve the information I provided on this page, or you simply want to add your comments or experience about this product, feel free to post a comment below.

5-layer blockboard, the light and stable lumber core

5-ply blockboard

5 ply Poplar Lumber CoreBlockboard (aka lumber core) is well known worldwide due to its characteristics of bending strength, lightness and screw-hold ability. As it’s a real solid-wood alternative to timber, suitable for the production of high-quality and long-lasting furniture and furnishings. It is commonly used for shutters (also with large dimensions), structural components (shoulders), long book shelves, partition walls and cabinet-making.
While most blockboard manufacturers worldwide are producing a 3-ply construction, in Italy it has been developed in the 5-ply construction, with two veneers on each side, in order to achieve the best surface stability and flatness.

Trade names
Blockboard, lumber core, lumber core plywood, commercial block board, Manufactured Board, single core board, Block Composite Board, battenboard, Tischlerplatte, Stabsperrholz, PDP, Mebloplato, Meubelplaat, Meubelpanelen, panneaux latté, alistonado, listellare, panforte, paniforte a listelli.

5-ply blockboardFeatures and advantages
– Excellent dimensional stability and moisture resistance.
– High bending strength.
– Light weight.
– High screw-holding resistance.
– Easy to work and cut, allowing long-term life to tools during processing.
– Suitable to be covered with plastic laminate or veneer.
– A real green alternative to solid wood, with good resistance to warping.
– To achieve maximum strength, it’s important to ensure that the core runs lengthways.

Composition
A. The center of the panel (blockboard core) is a solid slab generally made with side-glued lumber strips in the width of 28-38 mm; the most common are kiln-dried soft wood timber species used in the cores are poplar, spruce and pine.
B. The blockboard core (long-grain) is then glued under high pressure with two layers of crossband veneer sheets on each side, with parallel grain. The two layers of veneer are normally in poplar, with a minimum total thickness of about 2.5-3.5 mm per side.

Blockboard technical draw

Standard sizes
1300×3050 mm
1880×3140 mm
1880×3680 mm (*)
2070×2800 mm
2070×4200 mm
(*) = most common size

Thickness
14 to 30 mm
(other thicknesses are available with 3-ply or double-core construction)

Special sizes and thicknesses upon request.

Technical specifications
Thickness tolerance+/- 0,3 mm
Length tolerance+/- 5 mm
Width tolerance+/- 5 mm
Tolerance in squaring2 mm/m
Moisture content (at delivery)8-12%
Reaction to fire (EN 13501-1)D-s2,d0 – Dfl-s1
Density (EN 323) for poplar coreabout 420 kg/m3
Density (EN 323) for spruce coreabout 450 kg/m3

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.

If you are looking for a reliable supplier of this product or you need more technical information, please contact me using the form on this page.

If you want to improve the information I provided on this page, or you simply want to add your comments or experience about this product, feel free to post a comment below.

Multiflex, the flexible and bendable plywood

Multiflex bending plywood

Multiflex is a special kind of plywood which, thanks to its particular composition, has a high flexibility and bend-ability that can be applied on a curved radius.
Multiflex is a very practical solution to produce curved structures, especially when small radii are required.
Multiflex is a unique product for the ease with which it can take any curvature and rounded shapes, including “S” or circular.
Multiflex is suitable in the creation or the coating of curved columns, arches cabinet applications, curved furniture parts and fixtures in restaurants, reception and office work stations, stage sets, spiral stairways, boats, caravans, and interior architecture in general.

Trade names
Flexply, flexoply, flexible plywood, bendy plywood, bending plywood, bendable plywood, curve-ply, wacky wood, wiggle wood, contreplaqué souple, panneau contreplaqué cintrable, biegensperrholz, contrachapado curvable, compensato flessibile, pannello compensato curvabile, esotico flessibile, esoflex, compensato pieghevole, radius plywood.

Features and advantages
– Cold forming with small radii (with no need for heat forming or water treatment).
– Self-supporting structure eliminates the need for structural skeletons or special supports.
– Complex multi-radii shapes can be quickly and easily prepared.
– The panels can simply be combined and glued together to create different thicknesses (10, 13, 15, 18, 20, 21 mm, etc.).
– More convenient than other pre-made wood forms.
– Reduction of material and labour costs to a minimum.
– No need for special equipment or prior experience.

Composition
The panel consists of two veneer sheets of Ceiba pentandra (exotic veneer from timber plantation wood, also called fromager or fuma) with parallel grain and inner core of thin wood or other flexible material.
From 3 mm to 9 mm thickness the composition is 3-layers, over the composition is 5-layers.

Standard Sizes

Long grain
2500×1220 mm
3100×1830 mm
(bending in the longest dimension)

Cross grain
1220×2500 mm
1830×3100 mm
(bending in the shortest dimension)

Thickness
4, 5, 8, 10, 12, 16 mm

Special sizes and thicknesses upon request.


long grain
Multiflex long grain
cross grain
Multiflex cross grain
Technical specifications
Bending radius for a 5 mm boardabout 50 mm
Bending radius for a 8 mm boardabout 100 mm
Bending radius for a 16 mm boardabout 300 mm
Longitudinal elasticity for a 5 mm board210 N/mm2
Cross elasticity for a 5 mm board6300 N/mm2
Thickness tolerance+/- 0,35 mm
Length tolerance+/- 5 mm
Width tolerance+/- 5 mm
Tolerance in squaring2 mm/m
Moisture content (at delivery)8-12%
Reaction to fire (EN 13501-1)D-s2,d0 – Dfl-s1
Thermal conductivity (EN 12664)0,12 W * (m k)-1
Density (EN 323)about 400 kg/m3

Bonding (formerly called IF20) is made with urea-formaldehyde glue (UF) and is in compliance with the provisions of the EN 314-2 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), for uses subject to exposure to moisture variation, can also be produced upon request with melamine gluing.
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.

Usage and storage instructions
– Store the panels lying flat in a clean, shaded, dry place.
– Panels should be transported on a hard flat surface. Single panels can be rolled, but should not remain in this position for long periods.
– Do not expose the panel to sudden changes in humidity, temperature, and also protect it from sunlight.
– Glue the panels while they are brought into the desired shape. When the glue is dry, panel will retain its shape.
– High Pressure Laminate or paper-backed veneer can be applied during the initial curving process, or in a second step.
– Any wood glue can be used.

Multiflex is developed and optimized to work in perfect combination with GLOBAL membrane presses

GMP-P | GLOBAL MEMBRANE PRESS PROFESSIONAL from GLOBAL VACUUM PRESSES on Vimeo.

If you are looking for a reliable supplier of this product or you need more technical information, please contact me using the form on this page.

If you want to improve the information I provided on this page, or you simply want to add your comments or experience about this product, feel free to post a comment below.