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FINGER-JOINTED TIMBER

Finger jointed structural timber made of solid wood is a specially designed building material to meet the demanding requirements of modern timber construction and has been developed with precisely defined product characteristics. It's a kiln-dried, strength graded and finger-joined solid wood product from conifers.

Finger-jointed products supply two main market segments. Structural wood products are produced with the joints designed to have high tensile strengths. Finger-jointing provides a greater degree of stability than single, large dimension lumber pieces which can in certain circumstances be prone to distortion.

Finger-joints have been developed because it is not possible to make strong butt joints by gluing the end grain of adjacent boards.

In finger-joints the glued surfaces are on the side grain rather than end grain, and the glueline is stressed in shear rather than in tension.

Finger-jointed timber is generally high quality timber obtained by cutting out defects from lower grade material before finger jointing.

Applications

The finger joint is the most common joint used to form long pieces of lumber from solid boards; the result is finger-jointed lumber.

The finger joint can also be invaluable when fixing tables and chairs and also can be used in such things as floor boards, timber roof and door construction. This is also used in design technology for students. Finger joints can be hard to make without the right tools.

STRUCTURAL PRODUCTS

Structural finger-joints are glued joints connecting timber members end-to-end capable of transferring appropriate loads.

The structural joints for New Zealand pine use finger lengths of 10mm through to 25mm, though shorter finger lengths of 10mm are preferred.

Adhesives used in structural jointing such as phenol resorcinol and melamine urea-based glues must meet strict exterior and exposure tests.

New Zealand finger-jointed pine meets the requirements of New Zealand, Australia , Japanese, USA and British structural testing standards.

Extensive qualification to recognised national standards and in-house quality control tests are conducted by finger-joint manufacturers to verify the on-going strength and reliability of the timber joints.

APPEARANCE PRODUCTS

Finger-jointed lumber is used for a wide range of products where appearance is important. For this end use the 4mm 'micro joint' is offered by New Zealand manufacturers for Australasian markets as it is easily jointed, it provides a high quality finish and results in higher timber yields.

When clear adhesives are used, unblemished lengths of fingerjointed timber can be produced for high value end uses.

Appearance grade finger jointed products include mouldings. Fascia boards, handrails, balustrades, door and window components and weatherboard. 

USES OF STRUCTURAL FINGER JOINTED TIMBER

Finger jointed timber is used structurally in glue laminated beams, and sometimes in domestic construction as studs and trusses.

The purpose of structural finger joints is to maintain the strength of a piece of timber over its full length.

The strength of well made finger joints is significantly greater than the strength of the defects removed from the original timber.

For structural finger joints it is essential to dock the wood well away from knots, to avoid the strength-reducing effects of sloping grain around the knots.

USES OF NON-STRUCTURAL FINGER JOINTED TIMBER

Finger jointed timber is used in many non-structural applications, generally where attractive defect-free wood is required for decorative or functional purposes.

Typical uses of finger jointed wood include fascia boards, weather boards, joinery, furniture, door jambs and mouldings. Finger jointed radiata pine is being used increasingly for purposes where native timbers were traditionally used.

GRADES

Most finger jointed timber is of a high grade because defects are removed during the manufacturing process. Finger jointing is an excellent method of upgrading low grade material into valuable clear straight-grained timber.

Single board finger joint machine

Single board finger joint machine/Veneer finger jointing machine/finger jointer zig zag stitcher . Including coiling, reeling, sanding, polishing fabric-back-sticking slitting and re-coiling.The veneer line is used to make the planed veneer dried from short to long. The shape of joint is lopsided digit form gear and the length of the veneer jointed is up to 200-300 meters. The veneer joined is automatically made disc through coiling machine and is adhered with fiber bonded cloth through compound machine and then is confirmed the thickness sanded and polished through sanding machine. The veneer sanded is cut into some width as required through slitting and re-coiling machine and is automatically made disc edge sealing belt or sheeting material. be used to make the planed veneer dried form short to long .The shape of joint is lopsided digit form gear. The length of veneer joint is more than 200 meters.

Technological Process
Dried sliced veneer-->finger jointing-->uncoiling-->paper or pvc back sticking-->veneer sanding machine-->slitting and rewinding-->finish

Veneer coiling reeling machines

It can be used to roll the veneer finger-jointed to the shape of plate automatically for the use of the next procedure. Veneer Sanding polishing Machine used to sand the whole roll of veneer compound to calibrate and polish the veneer Veneer fabric-back-sticking Machine be used to stick a layer of non-woven fabrics on the back of veneer jointed to add the intensity and strength of the veneer and prepare for sanding and producing sheeting material .It covers the functions of glue spreading and hot compound which are one pass.
veneer slitting and rewinding machines be used to cut the veneer jointed and sanded to the width as required to make edge sealing belt or sheeting material of finished product .The cutting width of this machine can be adjusted and it is equipped with tension controlling device.

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