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1、Multi-Nip Calender Covers & J. `$ i. c* G' B4 L
Required cover properties
0 S9 _# A' } J.Superior impact resistance! \ u$ x8 A4 F, h. T( e
.Superior wear resistance& Q0 l5 B/ w' E- R
.Good doctorability
$ q0 e1 x) y8 R2 T- R.Superior barring resistance
5 J* \4 x; Z) @. k+ }.Homogenious, smooth cover surface for SC/Release/LWC
. P3 x: j* x- F3 _9 X.Ultra-fine surface for coated fine paper1 ~ \) T% C7 S
.Low heat build-up
% q0 [8 W7 u8 h2\Calender Cover Demand
6 c2 Z1 k; f5 b1 m# i: g/ a2.1 Application Properties0 X+ K0 X+ F! |+ v1 q6 k: c1 x0 y ]
- Grinding Interval+ l7 n1 `: @1 n$ v
- Wear Resistance$ \& E! i L7 ~- q7 N* y( M
- Damage Tolerance; ?: K |$ E7 j, x8 f& i5 M
- Surface Topography. z4 d8 @: H( W/ G
- Hardness6 H% }/ d" ]6 A8 S* \
- Self Cleaning Properties
' l8 m' l8 O7 }' V( f7 d) J8 E/ L4 i5 v- Doctorability1 g6 I# L2 P. f/ R! u
- Colour4 S1 H, h! P8 a3 P9 G9 z
2.2 Machine Factors6 x% m+ U- b" F8 U8 ^* N
- Linier Load
6 E! R/ Y5 z4 ]3 g9 k3 m- Speed
2 z6 _* l; |% h# M B1 |& _7 w) f0 m. e- Dimensions
L' m6 {/ E) `. J- Calender Type8 L7 t' A6 r& T) n2 t) x
- Roll Type% R O1 z0 F1 d. t% h
- Paper Quality
4 @; T2 x+ V5 J3 P5 k0 p- Temperature
! i9 K) t# [- X) s9 u2.3 PhysicalProperties' Z/ w1 b: u& U6 J" S8 C1 t
- E′ (t, x, y, z)
# S v- r; N( z; }) j* @- tan d (t)0 F; p3 \- H& A& o8 k: C) C! Q
- sB (t)
% E7 H. D$ ?% ~ d; t- aT (x, y, z)% K, {7 g5 z8 C/ l7 v
- Wspez" C* V, _# D4 u0 J
- K1C
8 X8 g( V( U) V" J- sZ (t)' P0 ^. f4 p) R1 D: n6 ^
3\ Calender Cover Criteria
8 u. {/ N$ v' W" J w) _3.1 Finishing Results
' x7 T5 A# j6 {1 J -Dynamic deformation behaviour
/ P7 q; {5 H% g0 a -Hardness" [ A1 p: e) _) m
-Surface Topography. c& S2 G7 W7 ~4 H' V
-Less dirt accumulation
; H: ~& b) l* Z/ E3 D) h% M3.2 Damage Tolerance* T- o3 J$ j4 L5 @8 |6 l
Residual Stress
8 Q% m- ^4 u! O- N8 k- Fracture Toughness
: k0 u+ Z6 }. v3 V- Impact Behaviour f1 B# R/ B% Z3 h
- Dynamic Heat buildup2 D! U1 x9 F! q& l$ G
- Thermal Expansion Coefficient
; p1 v4 x# X9 y) U3.3 Tribological Properties
% i4 {$ Q) q: D" R5 {- Wear resistance
) K( q. T2 t! C& O& |7 A) W- Structural Strength
2 B$ q5 B. J% g! o- L- Coefficient of friction |
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