EN ISO 137:2015 PDF

Name: EN ISO 137:2015 — Wool - Determination of fibre diameter - Projection microscope method (ISO 137:2015)
SKU: EN ISO 137:2015
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Wool - Determination of fibre diameter - Projection microscope method (ISO 137:2015)

Название (английский):

EN ISO 137:2015

Wool - Determination of fibre diameter - Projection microscope method (ISO 137:2015)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 20
Дата публикации:: 16 декабря 2015 г.
Издание:: CEN EN 137 edition 1 version 1
ICS:: 59.060.10

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Описание (английский):

ISO 137:2015 specifies the procedure and the measurement conditions for the determination of the wool fibre diameter using a projection microscope. The method is suitable for wool fibres in any form and also for other fibres of reasonably circular cross-section. (In the case of dyed, bleached or finished fibres, the diameter might be different from that of fibres not subjected to such treatments. The estimates of fibre diameter obtained at the various stages of processing one lot of wool will not necessarily be the same.)

Abstract

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Стандарты, упомянутые в описании

Overview

EN ISO 137:2015 / ISO 137:2015 specifies the procedure and measurement conditions for determining wool fibre diameter using the projection microscope method. Adopted by CEN as EN ISO 137:2015, the standard describes how to project magnified images of fibre snippets onto a screen and measure their projected widths to obtain mean diameter values. The method is suitable for wool in any form and for other fibres with reasonably circular cross-sections. Note: dyed, bleached or finished fibres can give different diameters than untreated fibres, and measurements at different processing stages may vary.

Key topics and requirements

Principle: Projected images of fibre snippets are measured on a graduated screen to determine the projected width (mean diameter).

Apparatus:

Projection microscope with light source, condenser, movable stage and circular screen.
Objective/ocular combination capable of 500× magnification (calibrated by a certified micrometer).
Micrometer graduated scale for periodic calibration (0.01 mm divisions projected to cover 5 mm on screen for 500×).
Snippet cutters or microtome and fibre holder/pusher for controlled snippet length.
Mounting medium with refractive index between 1.43 and 1.53 (e.g., cedarwood oil, liquid paraffin); anhydrous glycerine is not suitable.
Standard microscope slides and No. 1 cover glasses.

Sampling & specimen prep: Total sample and subsample preparation follow ISO 1130 and conditioning per ISO 139 where applicable. Procedures for raw wool, slivers/rovings/yarns, snippet cutting and mounting are described.

Measurement procedure: Randomized sampling of fibres, focusing, measuring projected widths within an optically reliable area of the screen, recording measurements and calculating mean diameter.

Reporting & accuracy: Calculation rules, example calculations (Annex A), and confidence limits/accuracy guidance (Annex B) are included.

Applications and users

Applications of EN ISO 137:2015 include:

Quality control and grading of wool by fibre diameter.

Textile manufacturing and yarn production where fibre diameter affects spinning, fabric handle and end-product performance.

Research & development in fibre science and textile laboratories monitoring processing effects (dyeing, finishing).

Standards bodies and certification labs performing compliant fibre measurements for specifications and trade. Typical users: wool testing laboratories, textile mills, research institutes, spinners, raw wool brokers and quality assurance teams.

Related standards

ISO 139 - Standard atmospheres for conditioning and testing

ISO 1130 - Sampling methods for textile fibres

IWTO-8:2011 - Method basis referenced in ISO 137 development

CEN adoption: EN ISO 137:2015

Keywords: wool fibre diameter, projection microscope method, EN ISO 137:2015, ISO 137:2015, wool testing, fibre diameter determination, projection microscope calibration.

EN ISO 137:2015 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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ISO 137:2015

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