Finishing department

Finishing Departement | Sappi Fine Paper Europe 1

Finishing


Contents

1. Introduction 3

1.1. Finishing in the production process 4

1.2. Finishing installations 5

2. Calender 6

2.1. Effect on paper properties 7

2.2. Soft calender 8

2.3. Supercalender 10

2.4. Janus calender 13

3. Slitting 16

4. Reel packaging & labeling 19

5. Cutting 21

5.1. Schematic drawing 22

5.2. Slitter 23

5.3. Cutter 24

5.4. Braking section 25

5.5. Counting strips, 2-reel mounting, triple cut 26

6. Sheet packaging & pallet labeling 27

7. Reama & ream labels 29

8. Logistics 31


1. Introduction

• Definition:

– According to customer specifications, the paper is cut in reels or sheets

and packaged

• Purpose:

– Eliminating imperfections

– Dividing the paper into sales units

– Protecting the paper against climatic conditions, moisture etc.

– Marking the product with identifying labels

• Configuration criteria

– Sheets:

Web direction: long grain, short grain

Packaging: unreamed with or without counting strips, ream wrapped

Pallett: height, weight, sheets

– Reels:

Width, diameter, core, weight tolerance

(Finishing


1.1. Finishing in the production process

Collecting raw materials

Stock preparation – mixing the raw materials, fillers, additives

Paper machine – paper production (sheet formation)

Coater (+ calender) – paper improvement

Finishing – making the paper ready for the customer


1.2. Finishing installations

• Overview

– Calender (satination)

– Slitter-rewinder

– Reel packaging machine

– Sheet & ream packaging machine

Paper storage as an independent part of logistics

• Paper improvement

– Satination, just likecoating, can be part of the improvement process

– Online calender as part of the paper machine

Paper production Coating Satination Finishing

Paper improvement


2. Calender

• Purpose:

– Making the paper smooth (mechanical process) and glossy (optical property)

Surface plasticizing

• Method:

– Physical processes – ironing effect - triggers

Pressure (mechanical)

Moisture exchange (hydrostatic)

Thermal force – administering heat - convection

• Available components:

– Heated steel rolls, unheated paper rolls

– Heated steel rolls – unheated plastic rolls or rubber rolls

• Impacting parameters:

– Paper: temperature, humidity, surface mass, fibre material, fillers

– Coating: humidity, temperature, mass, binding agents, pigments

– Calender: roll temperature, roll roughness, roll surface, bending compensation, line

force, nip pressure, number of nips, dwell time, velocity


2.1. Effect on paper properties

• Advantages of calendering:

– Enhanced smoothness, enhanced gloss

– Decreased air permeability, decreased oil absorption

• Disadvantages of calendering:

– Increased density

– Decreased thickness, stiffness, opacity, whiteness, rub resistance

Base paper Coated paper + Calendered


2.2. Soft calender

Higher pressure – lower temperature

Paper web Heated

steel rolls

Plastic or

rubber rolls

Components: heated steel rolls, rubber or plastic rolls

higher pressure, lower temperature


2.2.1. Soft calender Pictures


2.3. Supercalender


2.3.1. Supercalender

Components: heated steel rolls and paper rolls

low pressure, high temperature


2.3.2. Supercalender Pictures


2.4. Janus calender

Components: heated steel rolls, paper rolls

high pressure, high temperature

Steel roll

Plastic roll

Steel roll

Plastic roll


2.4.1 Janus calender

• Combined advantages of supercalender and soft calender

– High pressure, high temperature

• Additionally:

– Nip Protect System for fast and secure roll separation

– Special tool for easier roll changes


2.4.2 Janus calender Pictures


3. Slitter

Mother reel

Knife

Daughter reels


3.1. Reel cutter

Daughter reels Secundary stations


3.2. Type - Vari Dur Reel cutter

Support rolls

Mother reel Daughter reels


4. Reel packing installation


4.1. Reel label (Allegro)


5. Cutter Overview


5.1. Schematic drawing


5.2. Slitter

Blade

Paper web


5.3. Cutter

Blade


5.4. Braking section

Fixing rolls

Paper web


5.5. Counting strips, 2-reel mounting, triple cut

http://www.bohemia-grafia.de/upload/foto/machines/000633/000633-001.jpg


6. Sheet packaging

Pallet

Pressure beam

Label applied by robotic arm


6.1. Pallet label Pallet label nr. 110


7. Ream

Wrapped reams in neutral packaging


7.1. Ream labels

Improved layout Easier identification

with emphasis on brand, gsm & surface

Standard label size (210x12mm) Already standard in most of Sappi’s mills, this size enables safe handling

of XL format sizes throughout the supply chain

Label print Black print on white label


8. Logistics High shelves storage and truck transport


Thank you

for your attention

Jörg Abelmann

Business

Finishing department