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1、Multi-Nip Calender Covers
/ w8 v; R5 {4 u) M& q1 V) a. B- ~Required cover properties
. Z6 E9 C9 h' Y. V$ R6 Y.Superior impact resistance" u$ `; ?8 M% m F$ W
.Superior wear resistance
8 N4 b: }9 j: F8 P$ k h2 ^% T.Good doctorability
9 b' c/ ^ `9 P& X.Superior barring resistance
" n7 r) K' x3 O5 j3 I/ B8 j+ G.Homogenious, smooth cover surface for SC/Release/LWC% U: I! B) x4 ?( u
.Ultra-fine surface for coated fine paper
$ A3 R$ J" [* {& c) H.Low heat build-up8 }4 w3 | w" {+ u- l
2\Calender Cover Demand
: b! f9 V" K4 N& Q, p. p2.1 Application Properties P, t8 e2 q& m7 p8 i% W
- Grinding Interval
6 f6 e4 F; A6 Q0 |- Wear Resistance
/ a- i3 r0 T4 W7 P- Damage Tolerance
5 C' o$ W. D' [4 T- Surface Topography
! J" R2 k* R0 Q, Y- Hardness* L+ W- d( g5 W3 k2 J+ Y
- Self Cleaning Properties4 U/ n. K$ |/ O8 G. E' D7 J
- Doctorability8 e3 H2 y- e% [. v
- Colour% O, B/ d; |! {6 s/ E
2.2 Machine Factors- Y$ A! V/ ^9 z& O6 z p- S4 m
- Linier Load2 T( q% F* O+ }. Z
- Speed
$ J. l2 e6 a* m$ j- Dimensions
# V! S8 }0 ~+ ^9 L- Calender Type) A: l$ ]& D9 f0 M
- Roll Type
; K% o* G+ V g8 u1 ?+ H- Paper Quality) j1 n( D( k/ }- p. |3 [! A
- Temperature( _+ [, Z% Y& ]$ }9 l
2.3 PhysicalProperties
, m6 C$ l) o8 d3 S$ n* f- E′ (t, x, y, z); ?6 X) k; ?* [! C p$ B
- tan d (t)( S$ r g* U' H, b3 M. c
- sB (t)$ D5 B* @2 o' ^2 E
- aT (x, y, z)0 _2 a9 p9 T5 B: r; F9 ]9 v
- Wspez
( c8 N3 k* R5 s# @' k; Z* E- K1C3 [' C' C: F0 `$ g
- sZ (t)) B2 P, W9 k' \2 @
3\ Calender Cover Criteria. W& T4 r0 w: t( x4 N
3.1 Finishing Results 2 z+ ?( r9 n2 P
-Dynamic deformation behaviour
; J+ ]# X% q7 X, {( z& l -Hardness M5 K3 k. _2 {6 J2 ^
-Surface Topography
; _0 ^1 b- a5 l5 D7 H -Less dirt accumulation$ d9 Y' E/ [5 T, V0 ?
3.2 Damage Tolerance
2 z7 C: e4 i8 d. @: L v1 ^Residual Stress! U% ?/ k" I5 y. }( L* ], N/ X" I: `# o
- Fracture Toughness `9 f3 q6 x/ j% j" E& G& K [
- Impact Behaviour
2 E6 s Z6 U4 u1 y4 N7 x; V- Dynamic Heat buildup
+ U- S; R% q8 r- Thermal Expansion Coefficient f- P& D1 C$ j @
3.3 Tribological Properties+ ]/ O8 m) W, z* ?
- Wear resistance
; Q8 _) Q6 V3 _- P; m7 I, ~- Structural Strength0 L* c9 H/ N+ a$ _. {1 j
- Coefficient of friction |
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