Rollers

Rollers

Types are:

Al₂O₃ Rollers with a application temperature up to 1300°C

Metal Rollers with a application temperature up to 1100°C

SIC Rollers with a application temperature up to 1800°C

Fast-burning kilns (roller kilns) represent the optimum of sintering technology in tile industry.In the field of sanitation, metal and glass industry roller kilns are used for refining processes, too.Schwendler is the most important supplier of Aloxi rollers worldwide.

Application temperatures for aloxi form 80 to 1350°C with constant rotation of the rollers. Aloxi rollers are products of highest dimensional accuracy. To prevent temperature radiation they are available sealed on both sides by a heat-resistant fibre.

In operation, the roller drive should not be turned off till the kiln has cooled down Usually Aloxi rollers are pre dried of the kiln. For that purpose the Aloxi rollers should be stored on the kiln for 48 hours.

Physical Properties

Crystallograph Analysis: Mullite
Bulk density: 2,4 - 2,5 g/cm³
Apparent porosity: 21 - 23 %
Absorbed water: 8 - 10 %
Content: 79%
Thermal expansion: 61 /K x 0,000001
Thermal shock resistance: excellent
Suggested temp. of Application: 1300°C
Cold crushing strength: 50 N/mm²
Thermal conductivity: 1.4 - 1.6 W/mK

Metal Rollers
		Cr	Ni
ALLOY	601 - 2.4851	21 - 24 %	59 - 63 %
AISI	310 - 1.4845	24 - 26 %	19 - 22 %
AISI	304 - 1.4301	17 - 19 %	8,5 - 9,5 %
With a application temperature up to 1100°C

SIC Rollers
Recrystallised Silicon Carbid Rollers KERAMOX
Temperature	1700°C
Bulk density	2,6 g/cm³
Porosity	16 - 18 %
Cold crushing strength	max. 300 N/mm²
Bending strength	90 - 100 N/mm² (20°C) 100 - 200 N/mm² (1400°C)
Refractoriness under load	max. 1800 T₀₅ (°C)
Thermal expansion	4,8 °C^-1 x 10^-6
Thermal conductivity	23 W / m x K (1100°C)
Elasticity module	240 x 10³ N/mm²
Specific heat	1000 J/kgK
Thermal shock resistance	very excellent