8/13/2019 Paper Process

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The process of paperm

including water, energy

chips (1), that contain c

fiber component of wo

most plant life.

The paper mill boilers (

turbines (3) that make e

pumps. Steam is also u

to cook the wood chips

pulping. The boilers us

by-product as fuel. Les

boiler fuel comes from

Wood fiber often come

paper mills as chips, (4

are debarked ( 6) and th

(7) Chips and chemical

which is a big pressure

with chemicals and ste

are separated into woo

chemical binding the ce

the mixture is blown ou

digester into a non-pre

Washers (10) clean the

the cooking chemicals

pulp. The cooking chem

black liquor, is pumped

which remove water. T

liquor is pumped into a

(12) its bio-based cont

the majority of steam a

power the facility. The

liquor burns and provid

inorganic material beco

that is drained from the

water and prepared for

to cook more wood chi

causticizer (13) from a

chemicals are pumped

allow the solids to sett

chemicals are sent to t

and residuals are wash

lime kiln to be turned i

The naturally brown pua bleaching process (16

used for books and ma

tissues, and hundreds o

unbleached pulp is use

and corrugated shippin

boxes). The pulp fibers

paper machine in refine

(18) is often used for a

of wood fiber from tree

(19) and cleaned, (20) j

the digester and the pu

uniform sheet of paper.

To make paper, a pulp

fiber and 99 percent w

headbox (22) onto a mo

screen that drains som

wire pit (24). The sheet

into a press section (25

removed. The paper pa

enclosed in a hood (27

get coated with liquid c

coating machine (28), t

and printability of the p

The calender (29) smoo

which is then wound on

is either cut into smalle

or made into sheets of

The finished product is

customers around the w

ational Paper Company. All rights reserved.

Slitter/Winder

Pulper

Digester

Trees

Logs

Dryers

(toDigester)

Electricity may besold to or purchased

from local utility.

Energy distributed topower the facility

Electricity distributedto power the facility

Hood

31

Sheeter

32

26

27

Cleaner20

Clarifier

15

Evaporator

11

RecoveryBoiler

12

Causticizer

13

Cleaners

21

Headbox

22

8

1

5

Lime Kiln

14

Turbine

3

Boiler

2

Former

23

Wire Pit

24

WoodChips

4

Washers

10

Bleach Towers& Washers

16Blow Tank

9

Press Section

25

Debarker

6

RecoveredPaper

18

Calender

29

30

Reel

Coaters

28

Chipper

7

19

Refiners

17