Quality control standards, recognised practice and metrology of - - PowerPoint PPT Presentation

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Quality control standards, recognised practice and metrology of - - PowerPoint PPT Presentation

Feb 27, 2023 88 likes •437 views

Quality control standards, recognised practice and metrology of greasy wool Mr Ian Ashman Australian Wool Testing Authority Ltd About AWTA Ltd Take and test wool samples Issue certified results Guarantee results Public

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Quality control standards, recognised practice and metrology of greasy wool

Mr Ian Ashman Australian Wool Testing Authority Ltd

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About AWTA Ltd

§ Take and test wool samples § Issue certified results § Guarantee results § Public company § Owned by industry

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Company capabilities

§ Textile testing § R&D § Computer services § Raw wool testing

§ Yield and micron § Staple length and strength § Other

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Why test wool?

§ Equity for buyer and seller § Allows specification

§ Trading § Processing and manufacturing performance § Competition with man-made fibres

§ Not compulsory

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Contract specifications

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IWTO

International Wool Textile Organisation

§ International rules for testing and trading wool textiles.

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Technical standards

§ Licensed by IWTO § Accredited by Interwoollabs

§ Round trials

§ Accredited by NATA § Audits

§ Internal § External

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Yield and Micron

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Yield and Micron – bale weighing

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Yield and Micron – core sampling

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Core sampling

§ 20 or more cores per lot § Same number of cores each bale § Every bale core sampled

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Replicate testing

§ Two or more sub-samples § Statistical tolerance

§ 95% confidence limits

§ Check tests

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Calibration

§ All measuring instrumentation

§ Schedule § Records

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Yield

§ Wash sample of known weight § Oven dry mass § Weigh residual components

§ Vegetable Matter § Grease § Mineral Content § Used to determine quantity of wool

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Yields

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§ Burr § Seed and shive § Hardheads

Vegetable Matter

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Carding

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Combing

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Micron

§ Average Fibre Diameter § Determines ‘end purpose’ § Significant influence on price § Measured across four instruments § 1000 snippets per instrument § Results combined

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Micron

§ Average Fibre Diameter § CV Diameter § Comfort Factor

§ Percentage < 30 microns

§ Fibre Curvature

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Grab sampling

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Display sample

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Tuft sampling

§ Approximately 60 tufts at random

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Staple preparation

§ Approximately 60 staples § One staple from each tuft § Random

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ATLAS - Length

§ Staple length

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ATLAS – Strength

§ Staple strength § Position of break

§ Tip § Middle § Base

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RIALS VALUATING DDITIONAL EASUREMENT

T E A M

§ Hauteur prediction formula § Average fibre length in a wool top

TEAM formula

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H = 0.43L + 0.35S +1.38D – 0.15M – 0.45V – 0.59CVD – 0.32CVL + 21.8

H = Hauteur L = Staple Length S = Staple Strength D = Fibre Diameter M = % Mid Breaks V = Vegetable Matter Content CVD = CV Diameter CV = CV Length

TEAM 3 formula

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Combined certificate

§ Single certificate representing many § Mathematically combined results § Individual component results

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Certified data

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