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1、Multi-Nip Calender Covers + S2 e3 M, m* M5 z5 L, n6 R7 y
Required cover properties
( Q& C4 A, g) E6 d.Superior impact resistance
- h* F! s! K4 _' T5 ], \! r* j.Superior wear resistance
9 X; Z! A, E: w! u8 e2 W& w8 Q3 [4 Y.Good doctorability1 E; |5 d5 R4 v
.Superior barring resistance2 y6 F) z, g8 r. x
.Homogenious, smooth cover surface for SC/Release/LWC
6 Z, @, o- {2 w2 a) H4 m.Ultra-fine surface for coated fine paper
( b' Z& E5 W- w" D1 n4 W.Low heat build-up% a# y( B2 e" C+ k
2\Calender Cover Demand
1 \8 X- y- l3 m/ v1 G2.1 Application Properties; [0 `. I# B! V' P' o S
- Grinding Interval1 C% Q8 Q& z& |" `+ a5 \0 P
- Wear Resistance
. Y8 ]& R# P" Z; n- Damage Tolerance
' Q$ G) b z. j5 u" \1 }9 h! X- Surface Topography7 `6 ~9 r! Y/ O f0 ]! n+ \
- Hardness& W% a1 ]! C- C* I4 Z* k
- Self Cleaning Properties
S: Z; T1 z! K+ ` a8 }' t8 S% {, F- Doctorability
6 u% H4 `+ b2 v- Colour
/ k" I8 S8 x; {% }3 C2.2 Machine Factors
- J4 n5 q; q# L1 T3 _- H- T" A- Linier Load
a5 ?9 Y- t9 K2 m- Speed0 @8 h, w! O0 [4 o# y8 {8 \3 t5 l
- Dimensions! ?$ U8 l1 g7 W/ m$ E
- Calender Type
& V$ e* n/ w9 ^% k- Roll Type3 b' T6 U' {8 j- R6 ]
- Paper Quality( H; }( X$ s0 m' ]# R4 j
- Temperature
) Y" l! d+ j5 n4 Q3 S2.3 PhysicalProperties4 B. Y6 m# Y1 z+ Z6 i# V
- E′ (t, x, y, z)
- H$ {% R1 U; E( S' M5 N" B' `+ y- tan d (t)! ]3 E, I V& L# O6 M6 Z2 x
- sB (t)
% u# F; }3 T" O/ r' y- aT (x, y, z)9 O$ F7 I0 {) D) B% C( p* @
- Wspez* [( T# N. B- O0 E
- K1C
6 g4 G1 A: i4 Z2 Q; l- sZ (t)) Q# T( o* i& t& Y/ K
3\ Calender Cover Criteria( ~. o0 B- Z9 |
3.1 Finishing Results
! G4 v/ A+ _# s, i) R& {% T/ u: ^ -Dynamic deformation behaviour
6 B. ^$ q2 J5 A) \" W# H; P5 Z -Hardness
- {' ]1 m0 v& x: \/ m' C' i0 r. F8 A -Surface Topography% B) Z7 ~& @' r+ Z0 Q1 t! [, ]
-Less dirt accumulation
) |4 i" q7 k1 @2 \% k" n3.2 Damage Tolerance
+ ]: r6 F( e9 KResidual Stress
' Z) d6 Y, B7 l& O0 N: V- Fracture Toughness
- e5 S# N2 s- M7 i- Impact Behaviour. |8 a' B& T! k$ ]8 L! B
- Dynamic Heat buildup
e2 A& Z: e9 @% T- Thermal Expansion Coefficient
- J& ~- C- [3 w! v0 Z) o3.3 Tribological Properties, l# S j& Y8 ^8 f# n
- Wear resistance
$ z8 G$ B2 s6 \! I& j8 O) _- Structural Strength9 g6 n) V I/ ], m
- Coefficient of friction |
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