SIST ISO 920:1995 PDF

Name: SIST ISO 920:1995 — Wool -- Determination of fibre length (barbe and hauteur) using a comb sorter
SKU: SIST ISO 920:1995
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Wool -- Determination of fibre length (barbe and hauteur) using a comb sorter

Название (английский):

SIST ISO 920:1995

Wool -- Determination of fibre length (barbe and hauteur) using a comb sorter

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 декабря 1995 г.
ICS:: 59.060.10
Технический комитет:: ITEK - Textile and textile products

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Описание (английский):

Applicable to wool in the form of worsted drawing slivers and rovings. Definitions of fibre lengths in relation to hauteur and barbe are given. The calculation of the coefficient of variation of both these terms is described. An annex deals with the Schlumberger apparatus for usage to determination the fibre lengths.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты SIST

Overview

ISO 920:1976 - "Wool - Determination of fibre length (barbe and hauteur) using a comb sorter" specifies a laboratory method for measuring wool fibre length distributions in worsted drawing slivers and rovings. The standard defines the two primary measures - barbe (mean fibre length from combing extractions) and hauteur (mean fibre length derived from mass proportions) - and describes sampling, specimen conditioning, the comb-sorting procedure, and calculation of mean lengths and their coefficients of variation. An annex describes the semi‑automatic Schlumberger (Type M.A.E.) analyser used for these determinations.

Key topics and requirements

Scope and materials: Applicable to wool presented as worsted drawing slivers and rovings.

Specimen preparation: 1 m samples, lightly twisted (~20 turns), ends aligned and conditioned 24 h in a normal atmosphere per ISO 139.

Equipment:

Precision balance (1 mg resolution).
Comb sorter / comb analyser (field of combs with successively lowered pegs that define length classes).
Semi‑automatic Schlumberger analyser described in the annex (10 mm class intervals, lateral displacement, leather pullers and brush collector).

Procedure:

Place a weighed mass (typically 500–4 000 mg) on the comb field, align fibre ends on the last comb and sequentially lower combs to peel off fibre fractions by increasing fineness.
Collect and weigh fibres from each length class separately.
Use the class mid‑lengths and class mass percentages to compute mean hauteur and barbe, plus their coefficients of variation.

Calculations and reporting:

Standard provides tables and formulae (using totals denoted A, B, C from class data) to derive length values and CVs.
Results presentation includes class distributions, histograms or cumulative polygons and full test details.

Reproducibility data:

Tabled method reproducibility is provided (e.g., reported method errors and percent figures for height and barbe and their CVs).

Practical applications and users

Quality control in wool processing, worsted spinning and combing operations.

Textile testing laboratories performing fibre characterisation for grading, blending and process optimisation.

Research and development groups evaluating fibre length distributions for product performance.

Buyers and sellers who need standardized, comparable fibre length data for specifications and trade.

Keywords: ISO 920:1976, wool fibre length, barbe and hauteur, comb sorter, Schlumberger analyser, worsted drawing slivers, rovings, textile testing, coefficient of variation.

SIST ISO 920:1995 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications and users

Related standards

Технические детали

ISO 920:1976

Wool — Determination of fibre length (barbe and hauteur) using a comb sorter

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