OVERVIEW

This unit describes a typical paper machine breakdown and the procedures for shutdown and startup.  Other unit segments show a wire/felt change and a grade change.

OBJECTIVES

Introduction to Papermaking Operations

·         List and explain the basic purposes of the three main parts of a paper mill.

·         Describe two ways in which paper machines are connected to drive configurations.

Sheet Breaks

·         Explain how a sheet break is detected, how its location in pinpointed, and how broke is removed safely from the machine.

·         Explain how a paper machine is threaded using a tail.

Shutdown

·         Describe common maintenance procedures performed during shutdowns and equipment in stock prep.

·         Describe common maintenance procedures performed during shutdowns on equipment in the wet end and the dry end of a paper machine.

Startup

·         Describe pre-startup checks commonly performed on equipment in stock prep and on a paper machine

·         Describe the steps involved in starting up equipment in stock prep and a paper machine after an extended shutdown.

Forming Wire Changes

·         Describe the steps involved in a forming wire change on a cantilevered fourdrinier.

Press Felt Changes

·         Describe the steps involved in a press felt change on a paper machine.

SUBJECTS

Introduction to Papermaking Operations

·         Stock preparation

·         The paper machine and finishing operations

·         Paper machine drive configurations

Sheet Breaks

·         Detecting breaks

·         Rerouting stock flow

·         Example: Correcting a sheet break in the dryer section

·         Restarting the paper machine

Shutdown

·         Stock prep equipment tasks

·         Wet-end equipment tasks

·         Dry-end equipment tasks

Startup

·         Pre-startup checks

o        Stock prep

o        Wet end

o        Dry end

·         Paper machine startup                                                                                            

Forming Wire Changes

·         Clothing change design considerations

·         Preparations for a forming wire change

·         New forming wire installation

·         Preparations for startup after a forming wire change

Press Felt Changes

·         Preparations for a press felt change

·         New felt installation

·         Preparations for startup after a felt change

·         Dryer felt changes