EN 14081-4:2005+A3:2008

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte SystemeStructures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machineTimber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems91.080.20Lesene konstrukcijeTimber structures79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 14081-4:2005+A3:2008SIST EN 14081-4:2005+A3:2008en,fr,de01-oktober-2008SIST EN 14081-4:2005+A3:2008SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14081-4:2005+A3
March 2008 ICS 79.120.10; 79.040 Supersedes EN 14081-4:2005+A2:2007English Version
Timber structures - Strength graded structural timber with rectangular cross section - Part 4: Machine grading - Grading machine settings for machine controlled systems
Structures en bois - Bois de structure de section rectangulaire classé selon la résistance - Partie 4: Classement par machine - Réglages pour les systèmes de contrôle par machine
Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 4: Maschinelle Sortierung - Einstellungen von Sortiermaschinen für maschinenkontrollierte Systeme This European Standard was approved by CEN on 26 August 2005 and includes Amendment 1 approved by CEN on 28 December 2006, Amendment 2 approved by CEN on 13 August 2007 and Amendment 3 approved by CEN on 7 February 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14081-4:2005+A3:2008: ESIST EN 14081-4:2005+A3:2008

! ", # $ and % &. Other parts of this European Standard are EN 14081-1, Timber structures - Strength graded structural timber with rectangular cross section -
Part 1: General requirements EN 14081-2, Timber structures - Strength graded structural timber with rectangular cross section -
Part 2: Machine Grading - Additional requirements for initial type testing EN 14081-3, Timber structures - Strength graded structural timber with rectangular cross section -
Part 3: Machine Grading - Additional requirements for factory production control According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14081-4:2005+A3:2008

EN 14081-2:2005 and the following apply. 3.1
Speed range maximum and minimum throughput speeds appropriate to the critical speed for the derived settings (see 6.2.2 of EN 14081-2:2005). 4 Symbols a deflection (in mm) b width of timber cross section (in mm)
F force (units as stated) I indicating property (units as stated) P pressure (units as stated) t thickness of timber cross section (in mm) Et,mean characteristic mean tensile modulus of elasticity parallel to grain (in N/mm2)
ft,k characteristic tensile strength (in N/mm2)
ρk characteristic value of density (in kg/m3) SIST EN 14081-4:2005+A3:2008

subscripts
n for setting being calculated a actual size measured as the average dimension of a batch 5 Settings for timber strength grading machines %Tables 1 to 9& give settings for certain grades, timber species and types of grading machine. Settings for other grades, species or grading machines shall be added when the relevant information is sent to, and assessed by, CEN/TC 124.
country or countries Source mark a
Species Permitted timber sizes b (mm) Grade c or grade combination Model value F Feed speed range (m/min) Comments and additional requirements UK Ireland 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C24 C16 F = 2,68 F = 2,27 150 max. Minimum temperature of timber at time of grading shall be -10 °C. The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn timber, tn in the following equations is the target tn + 1 mm.)
an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61
(bar) ()572739,413n1.701nnn+=ttFbF
Spruce Picea abies Picea sitchensis
C16 F = 1,24 150 max.
C24 C16 F = 2,79 F = 1,90 150 max.
GB IE Pine Pinus nigra Pinus sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C16 F = 1,34 150 max. C27 C16 F = 3,03 F = 1,43 150 max. C24 C16 F = 2,32 F = 2,09 150 max. Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50 60 ≤ bn ≤ 300 C16 F = 0,92 150 max.
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. & SIST EN 14081-4:2005+A3:2008

Species Permitted timber sizes b (mm) Grade c or grade combination Model value
Feed speed range (m/min) Comments and adjustments for size C18 ƒmod = 20,8 C24 ƒmod = 20,8 C27 ƒmod = 21,8 C30 ƒmod = 28,5 C24 C35 ƒmod = 20,0 ƒmod = 46,5 Estonia Finland Latvia Norway Russia d Sweden Poland
Finland Norway Sweden Latvia EE FI LV NO RU SE PL
FI NO SE LV Spruce Picea abies
Pine Pinus
sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C18 C30 C40 ƒmod = 23,8 ƒmod = 30,6 ƒmod = 54,5 150 max.
Air temperature to be +10 oC min. +35 oC max. Minimum timber temperature to be -10 oC Maximum relative humidity to be 85 % Timber mean moisture content to be > 10 % The following equations shall be used to calculate settings for the target size bn × tn. (NOTE For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm).
Pn = 4,412 Fn / tn0,61
(bar)
Fn
= (5,5I n n bntn3)10-12
(kN)
an = 830,7 tn-1,299
I n = 79.0mod24,022,0f4228nnbt
a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia. $ SIST EN 14081-4:2005+A3:2008

Species Permitted timber sizesb) (mm) Gradec) or grade combina-tion Model value
Feed speed Range (m/min) Comments and additional requirements Spain ES Scots pine Pinus Sylvestris 35 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C27
C16 F = 2,84
F = 1,71
100 max Minimum temperature of timber at time of grading shall be -10 oC. The following equations shall be used to calculate settings for the target size bn x tn. (Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 ()735729,413n1.701nnn+=ttFbF
(kN) Spain ES Corsican pine Pinus nigra 40 ≤ tn ≤ 70
100≤bn ≤ 200 C30
C18 Not relevant as all settings shall be calculated using equations in comments column 100 max Minimum temperature of timber at time of grading shall be
-10 oC. The following equations shall be used to calculate settings for the target size bn x tn.
(Note. For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm). an = 830,7 tn-1,299 Pn = 4,412 Fn / tn0,61 FnC30 = (96,2979 – 0,489321tn)anbntn3 / (1,3189433.109 ) FnC18 = (54,4979 – 0,489321tn)anbntn3 / (1,3189433.109 ) a) See 7.3 of EN 14081-1:2005. b) Timber sizes shall be to EN 336. c) Grades prefixed by C are strength classes given in EN 338.
Species Permitted timber sizes b (mm) Grade cor grade combi-nation Deflection a (mm) Feed speed range (m/min) Comments and additional requirements C24 C16
6,35 7,49 105 max. Spruce Picea abies Picea
sitchensis 35 ≤ tn ≤ 75
60 ≤ bn ≤ 300 C16 13,78 105 max. C24 C16
6,10 8,97 105 max. UK Ireland GB IE Pine Pinus nigra Pinus
sylvestris 35 ≤ tn ≤ 75
60 ≤ bn ≤ 300 C16 12,74 105 max. C27 C16 5,62 11,86 105 max. C24 C16 7,35 8,13 105 max. Chile CL Radiata pine Pinus radiata 35 ≤ tn ≤ 50
60 ≤ bn ≤ 300 C16 18,52 105 max. Minimum temperature of timber at time of grading shall be -10 °C. The following equations shall be used to calculate settings for the target size bn × tn. (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the following equations is the target tn + 1 mm.) Actual deflection settings are determined from an/0,19 rounded to the nearest whole number. Refer to calibration tables for machine to convert Force Fn to pressure setting Fn = 0,010 1 bn tn2 ()()91,0109851,07846,000567,071,36nn5nnn+×+=−btttaa a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338.
or grade combination Model value fmod Feed speed range (m/min) Comments and additional requirements Norway NO Sitka spruce Picea Sitchensis 33 < tn <53 88 < bn < 218 C18 C30 27,9 38,8 105 max.
Equation (2) shall be used to calculate settings for the target size tn and bn where tn and bn are target dimensions. Actual deflection setting an shall be rounded up to the nearest whole number. If the actual thickness ta exceeds the target thickness tn more than 1 mm then the pressure shall be increased by 3natt To convert from stress to force Fn use equation (1).
Refer to calibration tables for machine to convert Fn to pressure setting.
20101,0nnntbF⋅⋅=
(1) BITfbtfbtannnnn⋅⋅−⋅⋅⋅=−mod152,0186,0mod152,0814,014,218063 d
(2)
Requirements for grading:
- air temperature: 10 °C to 50 °C; - relative humidity in the air: < 85 %; - timber temperature: > -10 °C; - timber mean moisture content: > 10 %. a
See 7.3 of EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades specified by C are strength classes given in EN 338. d
BIT is a machine constant. & SIST EN 14081-4:2005+A3:2008

sizes b (mm) Grade c or grade combination Deflectiona
(mm) Feed speed range (m/min) Comments and additional requirements C24 9,82 C27 6,21 C30 4,75 C35 3,40 C27 C16 5,85 8,92 C30 C18 4,75 9,82 C30 C24 C18 4,46 5,49 8,92 C35 C24 C18 3,40 5,49 8,92 Finland Norway
Sweden Estonia Latvia Russia d Poland
Finland Norway Sweden Latvia
FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea abies
Pine Pinus sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 300 C40 C27 2,85 5,85 105 max. TR26 is a UK grade for trussed rafters. Its primary characteristic values are:
ƒm,k = 28,3 N/mm², E0,mean = 11 000 N/mm², k = 370 kg/m³ Other characteristic values can be calculated from the equations given in EN 384. Equation (2) shall be used to calculate settings for the target size tn x bn. where tn and bn are target dimensions. Actual deflection settings an shall be rounded to the nearest whole number. If the actual thickness ta exceeds the target thickness tn more than 1 mm then the pressure shall be increased by 3natt. To convert from stress to force Fn use Equation (1). Refer to calibration tables for machine to convert Fn to pressure setting. 20101,0nnntbF=
(1)
19,015050500901,0186,0−=nnnnbttaa (2) Requirements for grading: − Air temperature
10 °C to 50 °C − Relative humidity in the air
< 85 % − Timber temperature
> -10 °C − Timber moisture content
> 10 % a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia. SIST EN 14081-4:2005+A3:2008

or grade combinationDeflectiona
(mm) Feed speed range (m/min) Comments and additional requirements 30 ≤ tn ≤ 75 TR26 6,21 105 max. 60 ≤ bn ≤ 300
Finland Norway
Sweden Estonia Latvia Russia c Poland
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV
Spruce Picea abies
Pine Pinus sylvestris
TR26 is a UK grade for trussed rafters. Its primary characteristic values are:
ƒm,k = 28,3 N/mm², E0,mean = 11 000 N/mm², k = 370 kg/m³ Other characteristic values can be calculated from the equations given in EN 384. Equation (2) shall be used to calculate settings for the target size tn x bn. where tn and bn are target dimensions. Actual deflection settings an shall be rounded to the nearest whole number. If the actual thickness ta exceeds the target thickness tn more than 1 mm then the pressure shall be increased by 3natt. To convert from stress to force Fn use Equation (1). Refer to calibration tables for machine to convert Fn to pressure setting. 20101,0nnntbF=
(1)
19,015050500901,0186,0−=nnnnbttaa (2) Requirements for grading: − Air temperature
10 °C to 50 °C − Relative humidity in the air
< 85 % − Timber temperature
> -10 °C − Timber moisture content
> 10 % a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Settings apply only to timber grown west of the Ural mountain range in Russia. $ SIST EN 14081-4:2005+A3:2008

Species Permitted timber sizes b (mm) Grade c or grade
combination fmod for calc. of settings Comments and additional requirements C40 C30 C24 C18 50,8 40,6 31,3 21,6 C35 C27 C18 43,4 31,7 21,6 C40 C30 C24 C18 50,8 40,6 31,3 21,6 Finland Norway Sweden Estonia. Latvia Russia d Poland
Finland Norway Sweden Latvia FI NO SE ES LV RU PL
FI NO SE LV Spruce Picea abies
Pine Pinus
sylvestris 30 ≤ tn ≤ 75 60 ≤ bn ≤ 225
C35 C27 C18
43,4 31,7 21,6 Requirements for grading: • air temperature between 10 °C and 50 ºC; • timber temperature greater than -10 ºC; • air relative humidity less than 85 %; • timber mean moisture content greater than 10 %; • feed speed between 48 m/min and 124 m/min.
The following equation shall be used to calculate settings
afbtF727,0mod259,1n749,1nn000524,0=
where Fn is the indicating property in N (to obtain the indicating property in kilopound Fn shall be divided by 9,81), tn is the target thickness in mm, bn is the target width in mm (NOTE
For timber with a thickness to tolerance class 1, i.e. sawn, tn in the above equation is the target tn + 1 mm.) and fmod is given in the 6th column of this table for each grade. a is the pre-set deflection in mm and shall be: a = 1,3 mm for 70 ≤ t ≤ 75 mm a = 1,4 mm
for 61 ≤ t ≤ 69 mm a = 1,5 mm
for 54 ≤ t ≤ 60 mm a = 1,6 mm
for 47 ≤ t ≤ 53 mm a = 1,7 mm
for 44 ≤ t ≤ 46 mm a = 1,8 mm
for 41 ≤ t ≤ 43 mm a = 1,9 mm
for 38 ≤ t ≤ 40 mm a = 2,0 mm
for 36 ≤ t ≤ 37 mm a = 2,1 mm
for 34 ≤ t ≤ 35 mm a = 2,2 mm
for 32 ≤ t ≤ 33 mm a = 2,3 mm
for 30 ≤ t ≤ 31 mm a
See 7.3 in EN 14081-1:2005. b
Timber sizes shall be according to EN 336. c
Grades prefixed by C are strength classes given in EN 338. d
Settings apply only to timber grown west of the Ural mountain range in Russia. $ SIST EN 14081-4:2005+A3:2008

size b [mm] Grade or grade combination Settings Comments and additional requirements Germany DE 30 ≤tn ≤ 50 L36 IP ≥ 34,5 These grades apply to boards for glued laminated timber. Austria AT Spruce Picea abies 95 ≤bn≤ 280L25 34,5 > IP ≥ 22,3 The characteristic values for the grades are: 30 ≤tn ≤ 55 L35 IP ≥ 34,0
L36 L35 L25 L24
Czech Republic CZ Fir Abies alba 80 ≤bn≤ 280L24 34,0 > IP ≥ 21,0 ft,k [N/mm²] 22,0 21,0 14,5 14,0
Et,mean[N/mm²] 13 000 13 000 11 000 11 000
ρρρρk
[kg/m³] 400 400 350 350
Requirements for grading:
- timber temperature greater than 0 °C;
- timber mean moisture content between 7 % and 15 %;
- feed speed between 80 m/min and 300 m/min;
- timber surface planed or sawn.
a
See 7.3 of EN 14081-1:2005. b
Timber size shall be according to EN 336. &
[mm] Grade d or grade combination Settings Comments and additional requirements UK GB Sitka spruce 35 ≤ tn ≤ 80 C24 IP ≥ 10 800Requirements for grading: Ireland IE 70 ≤ bn ≤ 260C16 10 800 > IP ≥
6 000- timber temperature greater than 0 °C;
Picea sitchensis
C16 IP ≥
5 200- timber mean moisture content between 10 % and 30 %;
- feed speed not greater than 450 m/min;
- timber surface planed or sawn.
The moisture content shall be measured by a Brookhuis FMI In-line system. Germany DE Spruce 38 ≤ tn ≤ 100C27 IP ≥ 36,0Requirements for grading: Austria AT Picea abies 89 ≤ bn ≤ 250C16 36,0 > IP ≥ 20,1- timber temperature greater than 0 °C; Czech Republic CZ Fir
C24 IP ≥ 34,4- timber mean moisture content between 10 % and 18 %;
Abies alba
C18 34,4 > IP ≥ 26,9- feed speed not greater than 450 m/min;
C24 IP ≥ 34,4- timber surface planed or sawn.
C16 34,4 > IP ≥ 23,6 a
These settings are approved to permit each piece of timber to be graded as if it is two pieces of timber of smaller widths. The timber is subsequently cut lengthwise into two pieces with the correct grade marked on each piece. This requires the machine to have the appropriate software, and the timber sizes before and after grading, to be as required by that software. This note is valid for all approved source countries and species for this machine. b
See 7.3 of EN 14081-1:2005. c
Timber size shall be according to EN 336. d
Grades prefixed by C are strength classes given in EN 338.
size a c
[mm] Grade or grade combination Settings Comments and additional requirements Germany DE Spruce 30 ≤ tn ≤ 50 L25 IP ≥ 21,6 These grades apply to boards for glued laminated timber. Austria AT Picea abies 95 ≤ bn ≤ 280L17 21,6 > IP ≥ 16,9 The characteristic values for the grades are: Fir
L36 IP ≥ 32,9
L40 L36 L25 L17
Czech Republic CZ Abies alba
L25 32,9 > IP ≥ 26,8 ft,k [N/mm²] 26,0 22,0 14,5 11,0
L17 26,8 > IP ≥ 14,7 Et,mean[N/mm²] 14 000 13 000 11 000 9 000
L40 IP ≥ 39,6 ρρρρk
[kg/m³] 420 400 350 320
L25 39,6 > IP ≥ 20,8
L17 20,8 > IP ≥ 19,1 Requirements for grading:
- timber temperature greater than 0 °C;
- timber mean moisture content between 7 % and 15 %;
- feed s
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