Requirements:
Quality criteria of KVH®

 

KVH Finger jointer line

 

  
Sorting feature Requirements on

KVH®-Si
visual quality

KVH®-NSi
industrial quality

Sorting class DIN 4074-1 sorting class
S 10 TS;
C 24 to DIN 1052-2008		 DIN 4074-1 sorting class
S 10 TS;
C 24 to DIN 1052-2008
Dovetail joint DIN 68140-1 or DIN EN 385 DIN 68140-1 or DIN EN 385
Timber moisture 15% ± 3% 15% ± 3%
Cut type heart-separated
 heart-separated
Tree edge not permitted measured across
< 10% of the smaller cross-section side
Dimensional accuracy of the
cross section		 DIN EN 336, dimension tolerance class 2
≤ 10 cm ± 1.0 mm, > 10 cm ± 1.5 mm		 DIN EN 336, dimension tolerance class 2
≤ 10 cm ± 1.0 mm, > 10 cm ± 1.5 mm
Knot state

Loose knots and fallen knots not
permitted. Individual knocked-out knots
or parts of knots up to
max. 20 mm Ø are permitted.

 DIN 4074-1
Sorting class S 10
Knot contents A ≤ 2/5,
not over 70 mm		 A < 2/5,
not over 70 mm
Bark pockets not permitted
 DIN 4074-1
Cracks, radial shrinkage cracks
(drying cracks)		 Crack width b ≤ 3% of the related
cross-section width, max. 6 mm		 DIN 4074-1
Resin galls Width b ≤ 5 mm  
Discolouration not permitted DIN 4074-1
Insect attack not permitted DIN 4071-1
Longitudinal warping / Twisting = 8 mm / 2 m = 8 mm / 2 m
Processing the ends Cut at right angle Cut at right angle
Surface condition planed and chamfered Levelled and chamfered