THERMOWOOD Spruce Updated: March 2014. Thermo Spruce - March 20142 General Information Main end uses...

THERMOWOODSpruce

Updated: March 2014

Thermo Spruce - March 2014 2

General Information

• Main end uses for Metsä ThermoWood® are– Thermo-D: external cladding and decking– Thermo-S: internal cladding and sauna benches

• The heat treatment enables the use of Scandinavian Whitewood in areas such as external claddings without the need for a chemical preservatives

• However, the main share of Whitewood ThermoWood® is treated as Thermo-S for internal claddings

• Whitewood ThermoWood® is mainly used due to it’s appearance, thus visual quality is of high importance

• Main market for Whitewood ThermoWood® is the Alps area (France, Switzerland, Italy) where Whitewood ThermoWood® is used to “look old and traditional”

• Metsä ThermoWood® is more stable than untreated softwood. It is less able to absorb or lose moisture. This limits any potential for swelling, shrinkage or distortion

• ThermoWood® is sourced from well managed and sustainable forests


Size specification• General dimensions

22 * 150 / 175 / 200 / 225 Thermo-S Raw material can also be 47mm (split at Kaskinen)

25 * 150 / 175 / 200 / 225 Thermo-S 38 * 175 / 200 / 225 Thermo-S

Raw material can also be 63mm (split at Kaskinen) Special sizes for Velux

Thermo-S: Treatment temperature 190oC (mainly for indoor use)

Thermo-D: Treatment temperature 212oC (for both indoor and outdoor use)


General knot types Source: RT-kortti

Sound knot Dead knot Barkringed knot Black knot

Arris knot Splay knot Spike knot Knot cluster

GENERAL KNOT SUM RULE:If the knot size is smaller than the table value, a greater number of knots is permitted. Total knot sum counted in mm (=number of knots * diameter) should not anyhow exceed.


– Total Thermo Spruce production: abt. 10 000 m3 (budget 2011)– Metsäwood Sawmills producing raw material for Thermo Spruce

• Vilppula• Renko• Svir Timber

– Optimum rawmaterial moisture: 22%• So a bit more than regular shipping dry• Sawmills should try to get as near as possible: overkilning is a problem!

– Normal set-ups:• 22/25mm 4 ex log cutting from sound knotted logs• 47/50/63mm 2e x log cutting from sound knotted logs

– Normal grading for Thermowood is “sound knotted fifth”, where black knotted US and naturally VI & VII are graded away

– Normal lengths requirements: 4.2-5.4m– Following rules are for inside use and knots sizes reflects from grading

camera rules

General information; sawmills/volume


Inside face sound knot INSIDE FACE SOUND KNOT RULES

Size out Reference Amount

THICKNESS WIDTH of width length mm

ALL X 150 50 % 2000 12

ALL X 175 50 % 2000 12

ALL X 200 50 % 2000 12

ALL X 225 50 % 2000 12

Addition to above: 2 maximum knots (+7 mm to normal knot size) allowed.

Normally the sound knotson the face do not causedowngrading (if they are 100% intact)!


Spike knot

Sound knot rules apply also to sound spike knots

Formula for calculating spike knot square area:

(D + d) / 6

D

d


Splay knot Sound knot rules apply also to sound splay knots

Formula for calculating splay knot square area:

(D + d) / 3

D

d


Inside face black and dead knot

Black / Dead knot

Knot rules black / dead knotINSIDE FACE DEAD/BLACK KNOT RULES



ALL X 150 15 % 2000 3

ALL X 175 15 % 2000 3

ALL X 200 10 % 2000 3

ALL X 225 10 % 2000 3

Addition to above: 1 maximum knot (+5 mm to normal knot size) allowed

The key point with black and dead knots is that there are no holes in the end product!


Inside face barkringed knot INSIDE FACE BARKRINGED KNOT RULES



ALL X 150 15 % 2000 2

ALL X 175 15 % 2000 2

ALL X 200 10 % 2000 2

ALL X 225 10 % 2000 2


The key point with barkringed knots is that there are no holes in the end product!


Pin knot On the board:Pin knots = sound knots <10 mm and dead knots<8 mm are allowed and not counted to the total knot sum.

Loose dead knots are not allowed because no holes are allowed in the end product!


Loose knot and hole Not allowed in the raw material nor end product!

Loose knot in ThermoWood treated material

Hole

Loose knot


Edge and arris sound knot Sound Arris knot

Sound edge knot

EDGE SOUND KNOT RULES


THICKNESS WIDTH of thickness length mm

ALL X 150 100 % 2000 6

ALL X 175 100 % 2000 6

ALL X 200 100 % 2000 6

ALL X 225 100 % 2000 6

Normally the edge and arris sound knots do not causedowngrading (if they are 100% intact)!


Edge black and dead knot Dead black knotEDGE DEAD/BLACK KNOT RULES



ALL X 150 45 % 2000 3

ALL X 175 45 % 2000 3

ALL X 200 45 % 2000 3

ALL X 225 45 % 2000 3


Knot must position minimum 3mm from inside face arris.

Edge black and dead knots are not critical in the product, because most likely they will not be visible!

min 3mm


Edge barkringed knot Barkringed knotEDGE BARKRINGED KNOT RULES



ALL X 150 45 % 2000 3

ALL X 175 45 % 2000 3

ALL X 200 45 % 2000 3

ALL X 225 45 % 2000 3


Knot must position minimum 3mm from inside face arris.

Edge barkringed knots are not critical in the product, because most likely they will not be visible!


Arris dead and black knot Dead and black knot

B: max 60mmA: max 12 mm

A B (inside face)22/25mm max 12mm max 60mm32mm max 12mm max 60mm38mm max 25mm max 60mm

44-63mm arris rules not in use


Arris barkringed knot Barkringed knot

B: max 30mmA: max 7 mm

A B (inside face)22/25mm max 7mm max 30mm32mm max 7mm max 30mm38mm max 15mm max 30mm

47-63mm arris rules not in use


Resin pocket

Not allowedin principle, butvery difficult todowngrade atWhitewoodSawmills.


Heartwood and heart

Allowed, heartwoodand heart are centre cut timber’s natural qualities.


Top rupture Not allowed in principle, but very difficult to downgrade at Whitewood Sawmills.


Shake

Through and ring shake not allowed!

not allowed!

OUTSIDE FACE SHAKE RULES

Max. Max. width Max. length End shake’s

length % mm mm max. length mm

20 % 2 50 80

INSIDE FACE SHAKE RULES

Max. Max. width Max. length End shake’s

length % mm mm max. length mm

20 % 2 50 80


Warp

Cup

Cup

Spring

Bow

WARP

% out of timber width Reference

Bow Spring Cup Twist length

20mm 15mm 3 % 25mm 2000


• Key points for Whitewood rawmaterial1. Sound knots are not a downgrading factor2. No holes (of any kind)3. No black/dead knots, which are likely to cause holes in treatment and/or

planing4. No mechanical damages nor wane5. No shakes, deformation, top rupture or other “VI defects”6. Goods have to be in nominal measurements when delivered to KTC7. Moisture content target 22 +/- 2 % for optimal treatment

• Optimal share of grades from ungraded logs:US abt. 30% (small black/dead knotted material)V/SF abt. 55% for ThermowoodVI abt. 10% and VII (or VI dom) abt. 5%

• Pricing to Sawmill has to be tempting in order to do a special product !

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THERMOWOOD Spruce Updated: March 2014. Thermo Spruce - March 20142 General Information Main end uses...

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