ISO 11093-7:2011 PDF

Name: ISO 11093-7:2011 — Paper and board — Testing of cores — Part 7: Determination of flexural modulus by the three-point method
SKU: ISO 11093-7:2011
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Paper and board — Testing of cores — Part 7: Determination of flexural modulus by the three-point method

Название (английский):

ISO 11093-7:2011

Paper and board — Testing of cores — Part 7: Determination of flexural modulus by the three-point method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 13 сентября 2011 г.
Издание:: ISO IS 11093 edition 2 version 1
ICS:: 85.060

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Описание (английский):

ISO 11093-7:2011 specifies a method for the determination, by the three-point method, of the flexural modulus of cylindrical paper and board cores, which meet the following criteria: internal diameter: 50 mm to 350 mm; minimum wall thickness: 0,05 × internal diameter, but not less than 10,0 mm; minimum length of core: 10 × internal diameter, but not less than 1 000 mm.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 11093-7:2011 specifies a standardized three‑point bending method for determining the flexural modulus (Young’s modulus) of cylindrical paper and board cores. It applies to cores with an internal diameter of 50 mm to 350 mm, a minimum wall thickness of 0.05 × internal diameter (but not less than 10.0 mm), and a minimum core length of 10 × internal diameter (but not less than 1 000 mm). The method treats the core as a slender beam and uses static bending theory to compute flexural modulus from measured load and deflection.

Key topics and technical requirements

Scope and sample rules

Minimum of five test pieces; length normally 10 × internal diameter or (1 000 ± 2) mm when shorter.
Sampling and moisture conditioning per ISO 11093-1 and ISO 11093-3.

Apparatus

Lower and upper vee‑arranged bearings (120° ± 2°); roll diameter (30 ± 1) mm.
Displacement gauge to measure deflection (accuracy ±0.01 mm when machine used).
Load applied by a belt with hanging weights (≈50 mm wide) or by a material‑testing machine.
When using a testing machine, loading rate (10 ± 0.1) mm/min and force measurement accuracy ±0.1 N.

Test procedure

Centre test piece on supports with specified centre‑to‑centre distances: lower bearings L = length − 300 mm; upper bearings l = length − 600 mm (tolerances ±2 mm).
Apply load at midpoint; required deflection f must be between 0.20 mm and 0.70 mm.
Read deflection within 2 s of applying hanging weight, or determine force producing the specified f when using a machine.

Calculation and reporting

Flexural modulus E is calculated from the recorded load (F), deflection (f), bearing distances (L, l), and core diameters (D, d) using the equation in Clause 8 (based on slender‑beam bending theory).
Test report must include sample IDs, moisture content, L/D/d, F and f, individual and mean E, method of loading, and any deviations.

Applications and users

Ensures core stiffness and bending resistance specifications for:

Paper and board core manufacturers
Reel and winding operations in paper mills
Packaging converters and roll‑handling equipment designers
Quality control and materials testing laboratories
R&D teams assessing core materials and designs

Useful for comparing core materials, verifying supplier claims, and ensuring reliable winding/reel performance.

Related standards

ISO 11093-1 (Sampling)

ISO 11093-2 (Conditioning)

ISO 11093-3 (Moisture content-oven drying)

ISO 11093-8 (Natural frequency and flexural modulus by modal analysis) - use ISO 11093-8 when flexural modulus is required for natural frequency calculations.

Keywords: ISO 11093-7:2011, flexural modulus testing, three-point method, paper cores, core stiffness, testing of cores, paper and board standards.

ISO 11093-7:2011 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 11093-1:1994

Paper and board — Testing of cores — Part 1: Sampling

ISO 11093-3:1994

Paper and board — Testing of cores — Part 3: Determination of moisture content using the oven drying method

BS ISO 11093-2:2025

Paper and board. Testing of cores. Conditioning of test samples.

ISO 11093-8:2012

Paper and board — Testing of cores — Part 8: Determination of natural frequency and flexural modulus by exper…