увод
ИСО (Међународна организација за стандардизацију) је глобални савез националних тела за стандардизацију (Тела чланица ИСО). Развој међународних стандарда се обично спроводи преко ИСО техничких комитета. Свака институција чланица заинтересована за предмет за који је основан технички комитет има право да буде заступљена у тој комисији. Међународне владине и невладине организације које су у вези са ИСО такође су укључене у овај посао. ИСО блиско сарађује са Међународном електротехничком комисијом (ИЕЦ) о свим питањима електричне стандардизације.

Процедуре које се користе за израду овог документа и оне које се користе за даље одржавање описане су у Делу 1 ИСО/ИЕЦ директиве. Нарочито, треба обратити пажњу на различите критеријуме одобрења који су потребни за различите типове ИСО докумената. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (види исо.орг/дирецтивес).

Please note that certain elements of this document may be subject to patent rights. ИСО није одговоран за идентификацију било ког или свих таквих патената. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

ИСО 2493-2-1920 – Determination of the bending resistance of paper and paperboard – Парт 2: Taber type tester

Any trade names used in this document are provided for the convenience of the user and do not constitute an endorsement.

Voluntary, related standards and conformity assessment related ISO specific and express the meaning of terminology as well as in relevant ISO technical barriers to trade (ТБТ) adhere to the principle of the world trade organization (WTO) information, please refer to the iso.org/iso/foreword.html.

This document has been prepared by Technical Committee ISO/TC 6, Папир, Board and Pulp, Пододбор СЦ 2, Test Methods and Quality Specifications for Paper and board.

The second edition cancels and replaces the technically revised first edition (ИСО 2493-2:2011). Главне промене у односу на претходно издање су следеће:

– Other data reported in Article 12;

– Several editorial updates.

ИСО 2493-2-1920 – Determination of the bending resistance of paper and paperboard – Парт 2: Taber type tester

A list of all the components in the ISO 2493 series can be found on the ISO website.

Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

1 Range
This document specifies the steps for measuring the bending resistance of paper and paperboard using the Taber type tester.

This document is used to determine the bending moment required to deflector the free end of a 38 mm wide vertically clampdown specimen by 15° when a load is applied at a 50 mm bending length. For a circuit board that bends 15° and tends to permanently deform, you can use a semi-bending Angle, то је, 7,5 °. The bending resistance is expressed as the bending moment and parameters set by the manufacturer of the Taber tester.

This method is mainly used for paper with high gram weight.

Note that this document does not cover a lower range version of the Taber type instrument with a 10 mm bending length (see References [5]).

ИСО 2493-2-1920 – Determination of the bending resistance of paper and paperboard – Парт 2: Taber type tester

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. За датиране референце, примењује се само наведена верзија. For undated references, a new version of the reference (укључујући све ревизије) примењује.

ИСО 186, Папир и картон – sampling to determine average quality

ИСО 187, Папир, board and pulp – Standard atmospheres for conditioning and testing and procedures for monitoring sample atmospheres and conditioning

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Bending moment M

The torque required to bend a rectangular specimen clipped at one end is measured under the conditions specified in this document

Белешка 1: The bending moment is expressed in millinewtonian meters (mN·m).

3.2 Flexural resistance B

The average bending moment (3.1) required to bend a rectangular specimen fixed to one end of the fixture is measured under the conditions specified in this document

Белешка 1: Flexural resistance is expressed in millinewtonian meters (mN·m).

ИСО 2493-2-1920 – Determination of the bending resistance of paper and paperboard – Парт 2: Taber type tester

3.3 Bending Angle α

The Angle at which the fixture rotates when it moves from its initial position to the position where the bending resistance (3.2) is measured

Белешка 1: The bending Angle is 15° or 7.5° (see Article 10).

3.4 Bending Length

The radial distance between the fixture and the position where the force is applied on the sample under test is constant

3.5 Flexural index

Flexural resistance (3.2) divided by gram weight to the third power

Јаван је само одељак са стандардним информацијама. Да бисте видели цео садржај, морате купити стандард преко званичних канала.