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FOR THREAD GUIDES
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WEAR RESISTANCE

High processing speed, especially of synthetic fibres, mean that thread guides must be highly wear resistant.
The following table shows the predictable wear of thread guides based on the technical properties of the yarn and its processing conditions.

Wear ratio Very low Low High Very high
Yarn Natural discontinuous
(e.g. cotton, wool)
Synthetic discontinuous
(e.g. wool fibres)
Natural hard
(e.g. linen, hemp, jute)
Natural and synthetic continue
(e.g. silk, PA, PP, PET ecc.)
Yarn count Extra large Large Thin Extra thin
Yarn speed Low Moderate Fast Very fast
Tension and / or pressure yarn on thread guide Very low Low Moderate high Very high
Yarn spin finish Without finish or not wear Moderately wearing Wearing Very wearing
Yarn / thread guide contact length Long Medium Short Very short
Suitable materials Hard chromium-plated or thermal treated metal PO oppure BT-7 BT-8 Allumina BX-7 BX-8 BX-8 BX-9 BX-2
BZ-1 BZ-2 BN-1 BC-4

A ceramic material wear resistance depends on:
- hardness;
- specific weight;
- mechanical strength.
A great hardness is the most important conditions to obtain wear resistant parts.

The following figure compares 500g load Vickers hardness values of Bettini ceramics with conventional materials such as tempered steel and tungsten carbide.

   
BC-4 Silicon carbide
BZ-2 Zirconium oxide stabilised MgO
BZ-1 Zirconium oxide stabilised Y2O3
BX-9 Aluminium oxide 99.7%
BX-8 Aluminium oxide 99.0%
BX-7 Aluminium oxide 97.5%
BX-6 Aluminium oxide 96.0%
BX-2 Aluminium oxide 99.9%
BX-1 Aluminium oxide - Zirconium oxide
BT-8 Titanium trioxide Ti2O3
BT-7 Titanium dioxide TiO2
   


   
BN-1 Silicon nitride
BC-4 Silicon carbide
BZ-2 Zirconium oxide stabilised MgO
BZ-1 Zirconium oxide stabilised Y2O3
BX-9 Aluminium oxide 99.7%
BX-8 Aluminium oxide 99.0%
BX-7 Aluminium oxide 97.5%
BX-6 Aluminium oxide 96.0%
BX-2 Aluminium oxide 99.9%
BX-1 Aluminium oxide - Zirconium oxide
BT-8 Titanium trioxide Ti2O3
BT-7 Titanium dioxide TiO2
   
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