Our philosophy in modern textile quality control

Problem of Quality Assessment

For decades, yarn buyers, as well as most spinning mills, have evaluated yarn quality based on the USTER® TESTER. These checks are based on random samples of 1/1000 of the spinning mill production.

Off-Line Laboratory tests (USTER® TESTER 4-SX etc.) allow a statement on average yarn quality. Bad bobbins (Off-Standards) such as higher hairiness, IPI etc. are only detected by pure chance.

But modern high-performance machines in knitting and weaving mills require an absolutely constant yarn quality.

A spinning mill produces with 40‘000 spindles a yarn Ne30 100% cotton. The daily production is 22‘000 kg.

conventional yarn testing in laboratory (Uster Tester)= testing scope per day:

Quality Assurance - Yarn Testing

0,014 % of production 3,12 kg (ca. 1 Cone)

What about the Off-Standard Cops

The average yarn quality is good

. . . are therefore State-of-the-Art in Textile Quality Control and conform with the long-standing philosophy of Loepfe in modern textile quality control

100 % of the production checked

100 % of the Off-Standard bobbins removed

Online Textile Laboratory Functions

Online Laboratory Data

Classification, Imperfection, Surface Index (SFI)

Online Classification

YarnMaster Spectra+

Cluster Channel ClearingShort, Long , Thin Clusterto detect: periodical and non periodical faults

Fault cluster can be detected independent of size of the single yarn defect.

- FaultCluster curve

YarnMaster and MillMaster

Significance of the Surface Index?

The surface of a yarn is characterized by:

• Irregularities (Thick-Thin)• Hairiness, Neps

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• You do not know when the ring spindle causes poor quality compact yarn.

• There are chances of producing very neppy yarn in compact spinning.

• Hairiness reduction and compact structure of the yarn surface are the key parameters of the compact spun yarn.

• So, surface monitoring of the yarn and the detection of the poor surface is a must – The ultimate solution for this is SFI

SFI- The Ultimate Solution for Compact Spun Yarn

SFI comparison / hairiness measurement (H) correlation (r = 0.91)

Quality Data Collection with SFI