OSIST prEN 13307-2:2004

SLOVENSKI OSIST prEN 13307-2:2004

PREDSTANDARD
oct 2004
Timber blanks and semi-finished profiles for non-structural uses - Part 2: Production
control
ICS 79.080 Referenčna številka
OSIST prEN 13307-2:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD
DRAFT
prEN 13307-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

August 2004
ICS

English version
Timber blanks and semi-finished profiles for non-structural uses
- Part 2: Production control
Ebauches et profilés semi-finis en bois pour usages non Holzkanteln und Halbfertigprofile für nichttragende
structurels - Partie 2 : Contrôle de production Anwendungen - Teil 2: Produktionskontrolle
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 175.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13307-2:2004: E
worldwide for CEN national Members.

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prEN 13307-2:2004 (E)
Contents Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Material requirements .6
5 Manufacturing .8
6 Production control.11
7 Lamella joint testing .12
8 Finger joint test.13
9 Records.13
Annex A (normative) Requirements for adhesives .14
Annex B (informative) Delamination test .15

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prEN 13307-2:2004 (E)
Foreword
This document (prEN 13307-2:2004) has been prepared by Technical Committee CEN/TC 175 “Round and
sawn timber”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry, it was initially submitted to a first enquiry under the
reference prEN 13307.
This European Standard is one of a series of standards for timber in joinery.

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prEN 13307-2:2004 (E)
Introduction
The production requirements and control described in this standard are designed so as to obtain a reliable
and durable bonding between the lamellae, in order that the bonds in the glued laminated blanks will maintain
their integrity throughout their intended service life. Such blanks are not intended to be used as load-bearing
members.
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prEN 13307-2:2004 (E)
1 Scope
This European Standard specifies the factory production control requirements of timber blanks and semi-
finished profiles (products) for non-structural uses, including glueing operations during laminating and/or finger
jointing.
Requirements are set for the raw materials, glueline integrity and the manufacturing process.
This specific requirements for dimensions, stability and moisture content are given in prEN 13307-1.
Requirements for mechanical strength of glued laminated timber are covered in EN 386.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) appliesEN 204, Classification of thermoplastic wood adhesives for
non-structural applications
1)
prEN12765, Classification of thermosetting wood adhesives for non-structural applications
prEN 14257, Adhesives - Wood adhesives - Determination of tensile shear strength of lap joints at elevated
temperatures (WATT ’91)
EN 301, Adhesives, phenolic and aminoplastic, for load-bearing structures - Classification and performance
requirements
EN 386, Glued laminated timber - Performance requirements and minimum production requirements
EN408,Timber structures – Tet methods – Structural timber and glued laminated timber – Determination of
some physical and mechanical properties
EN 13183-1, Moisture content of a piece of sawn timber – Part 1 : Determination by oven dry method
EN 13183-2, Moisture content of a piece of sawn timber – Part 2 : Estimation by electrical resistance method
prEN 13307-1, Timber blanks and semi-finished profiled for non-structural uses – Part 1 : Requirements?
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in prEN 13307-1 and the
following apply.
3.1
adhesive failure
failure in the glueline, where an adhesive film may be detected on the matching sheared wood surfaces
(compare 3.11 wood failure).
3.2
closed assembly time
interval between joining the lamellae together (with the adhesive already spread on its surface) and the
application of pressure and/or heat to the member

1) This draft standard is at present (Sept-00) in the CEN/TC193 (Adhesives) for decision concerning Formal

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prEN 13307-2:2004 (E)
3.3
end-pressure (for finger jointing)
applied lengthways force divided by the lamellae cross-sectional area.
3.4
exposure classes1, 2 and 3
classification system which indicates the average equilibrium wood moisture content for timber blanks and
semi-finished profiles in service in service. Described in prEN 13307-1.
3.5
lot
lamellae with same lay-up prepared within the same time period in same production line.
3.6
open assembly time
interval between the spreading of the adhesive onto the lamella, and joining the lamellae together,but not yet
applying heat or pressure (compare 3.2 closed assembly time).
3.7
potlife
length of time a ready mixed catalysed adhesive system retains a viscosity low enough to be used in
processing.
3.8
pressure
effective perpendicular clamping pressure in the glueline expressed as applied force divided by clamping area.
3.9
thermoplastic adhesive
adhesive capable of being softened by heat and hardened by cooling.
NOTE "hardened" as apposed to "chemically cured"
3.10
thermosetting adhesive
cross-linked adhesive which has undergone a chemical reaction by the action of e g heat, catalysts, ultraviolet
light, etc, leading to a relatively infusible state.
3.11
wood failure
failure of the glueline which is not an adhesive failure.
3.12
wood failure percentage
percentage of the wood failure area in relation to the total sheared area.
4 Material requirements
4.1 Timber
4.1.1 Species
The manufacturer shall identify the species used in the production of the profile. If the product is glued the
use of a combination of species is permitted, provided sufficient information is available to enable these
species to be satisfactorily combined in a glueline.
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prEN 13307-2:2004 (E)
4.1.2 Timber quality
The manufacturer shall identify the quality of timber used in the production. The requirements for the various
timber quality classes are given in prEN 13307-1.
NOTE The timber quality requirements for glued laminated blanks may vary depending on the end use.
4.1.3 Moisture content and dimensions
The manufacturer shall, at the time of production, check the moisture content and the dimensions as specified
in pr EN 13307-1. In the case of glued products the manufacturer shall ensure that, at the time of assembly,
the moisture content of the wood is within the limits specified by the adhesive manufacturer.
The moisture content of the timber in the completed components shall not exceed the guidance in Table 1 for
the particular end uses described.
Table 1 — Typical content levels of timber in particular end uses
Use class (EN 335) Exposure Moisture content in Examples of end use
service products
1 Internal E1 and E2 Internal doors, staircases
(9 ± 3)%
2 or 3 External E2 and E3 External doors, windows
(12 ± 3)%
4 Exposed to weather E5 Fences, external stairs
(15 ± 3)%

At assembly, the mean wood moisture content:-
• in every lamella shall be in the range identified by the adhesive manufacturer.
• between any two neighbouring lamellae in the same profile shall not be greater than 3%.
The same requirements apply to wood intended for finger jointing of the lamellae. Moisture content
measurements made with calibrated resistance moisture meters are considered satisfactory.
The moisture content of any piece or parcel shall be estimated using the method described in EN 13183–2. In
the case of a dispute the method to be used shall be the method described in EN 13183–1.
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prEN 13307-2:2004 (E)
4.2 Adhesive
The adhesive selected shall be capable of producing strong and durable joints so that the integrity of the bond
is maintained throughout the intended lifetime of the product. Adjustments in the formulation of the adhesive
system are permitted if approved by the adhesive manufacturer. Minimum adhesive requirements for each of
the exposure classes are given in Annex A.
5 Manufacturing
5.1 Premises
The premises shall be suitable for all production phases, taking the requirements given in this standard into
consideration. Special attention shall be paid to the air temperature and to the relative humidity. The relative
humidity in the production premises shall be such that the equilibrium moisture content of the wood can be
maintained.
NOTE The temperature in the production and curing shall be maintained above 15 °C. During curing, a higher
temperature may be needed, but this requirement may be limited to a specific part of the premises (curing and post-curing
chambers).
5.2 Storage
5.2.1 Timber
Timber for use in the production of the finger jointed blanks and laminated profiles shall be stored so as to
maintain its moisture content within the limits approved by the adhesive specified.
5.2.2 Adhesive
The adhesive shall be stored according to the adhesive manufacturer’s recommendations.
Components of the adhesive system shall be stored according to the adhesives manufacturer’s instructions.
Adhesives shall not be used later than the expiration date. The storage time is also dependent on the
temperature. Fluid resins, hardeners and mixed adhesives shall be stored in closed tanks. Hardeners in
powder form shall be kept dry.
5.2.3 Finished components
After bonding and pressing of the components, the adhesive manufacturer’s instructions regarding post-curing
shall be followed.
5.3 Equipment
Equipment shall be available:
- to continuously monitor and record the temperature and relative humidity (thermohygrograph) in storage,
production and curing areas.
- to measure the wood moisture content.
- for any necessary machining to provide surfaces fulfilling the requirements of the thickness tolerances and
surface quality
- for weighing and mixing resin and hardener in the required proportions.
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prEN 13307-2:2004 (E)
- for the uniform application of the required quantity of adhesive.
- to achieve the pressure and temperature necessary for bonding, without exceeding the adhesive’s closed
assembly time. The pressure must be adjustable, and the pressure applied must be possible to maintain
during the entire pressing process.
- to carry out any necessary production control tests.

5.4 Preparation
5.4.1 Lamella
Before bonding the temperature of the lamellae shall be ≥ 15 °C. and the moisture content of the adjacent
pieces shall be balanced so as not to cause uneven movement.
Lamellae shall be planed on all faces intended for bonding, with a tolerance on the lamella thickness of
± 0,2 mm. Planing shall take place just before the bonding stage is carried out. This is especially important
when bonding species which are resinous or contain extractives.
Note: The time between planning and laminating will vary according to the species used. An average time of
24 hrs is usual for European pines, however periods of up to 48 hrs may be acceptable for some hardwoods
and lower than 24 hrs for some species of softwood.
Systematic lamella thickness differences shall be avoided (see note to glueline tightness test).
NOTE Systematic lamella thickness differences mean that the surfaces of individual lamella are not parallel to one
another. This may result in one of the faces of the blank being wider than the other face during the bonding process. This
can also result in the application of uneven pre
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