1. CENTERLINING
What is it?
Why do I want it?
How do I do it?

2. What Is Centerlining?
 Centerlining is a program or methodology that a Plant can
use to reduce variability in a process.

3. Why do I want Centerlining?
 Would you rather build good quality into a Process or
inspect bad quality out?
 Centerlining helps a Plant build quality into the
process.
 If a Process is out of control, the quality of the finished
product is a random event.
 A Process that is Centerlined reduces the randomness
of the quality of the finished product. You consistently
make good quality product.
 Reduce Waste = $
 Improve Machine Operating Efficiency = $

4. How Do I Do It?
 To ensure a consistent outcome, you must ensure
consistent raw materials, consistent operating conditions
and consistent parameters.
 Raw Materials
 Starch
 Paper
 Conditions
 Corrugator
 Heat
 Parameters
 Recipes
 Gaps

5. Raw Materials
 Starch
 COA Certificate Of Analysis
 Viscosity
 Temperature
 Gel Point
 Paper
 Damaged Rolls
 Established Specifications

6. Conditions
 Corrugator At OEM Specifications
 Mechanical Audit
 Level
 Alignment
 TIR
 Bearings
 Corrugator Rolls
 Scheduled verification inspections
 Heat checks
 Steam System

7. Parameters
 Recipe’s (Best Run Settings)
 Machine Settings
 Speed
 Gap and setting verification must be done on a
regular basis
 Does .005” on display equal .005” on machine?
 If Hotplates are supposed to be 350 degrees…..are they?

8. How do I Make a Recipe?
 Get EVERYONE on board and involved in determining
your recipes.
 Determine what machine settings are adjustable.
 Determine what speed each grade should run at.

9. Expected Speed
 Must be established by incremental speed trials
 Must be done in conjunction with the entire crew
 Must be recorded
 The expected speed from the data must be agreed to by the
crews
 All crews must participate plus the starch man and roll
stock man
 The expected speed should be listed on the recipe on the
schedule or set automatically by the corrugator computer
 Any reason for not meeting the expected speed must be
recorded

10. What Is Good Board?
 You only want to record recipes when you are
running good board at the right speed.
 What is good board?
 Each Plant will have different resources available to
measure good board.
 Visual – Is it flat? (+/- ¼” per 2’)
 Manual – Is it stuck together?
 Rip Bond Test
 Pin Test
 Dimensions
 Moisture
 ECT

11. Continuous Improvement
– What and When To Record
 Basic approach - only record when the centerlined
conditions cannot be met.
 When the Expected speed cannot be achieved the
cause must be recorded
 When bad paper is the cause the roll is best
removed and held aside for mill inspection
 Running slow to save the extra effort of a roll
change is a bad practice
 Adopt this practice and increase productivity and
decrease waste

12. RESPONSIBILITIES
 Before this can be started, the corrugator must be brought
up to a sound mechanical condition
 A simple planned maintenance program needs to be
started
 Crews must be trained and checked out under the new
procedures
 Management is responsible for organizing the speed trials
 Expected speeds must be committed to by the crews - all
shifts
 The production manager must review the results daily
 Solutions must be sought to overcome all causes of slow
downs in future runs. Regularly reviewed

13. What Does a Recipe Look Like?
Where Do I Keep It?
 Has all the settings needed for that machine center
 It must be tailored to your machine
 Needs to be at the machine
 Could be laminated and taped to side of machine
 Could be on a TV screen at each station
 Could be programmed into a Corrugator Control System

14. Sample Recipe For SF
Single-Facer #2
CORR
PH LINER MED PR/ MR/AR
LINER ROLL AR/CR
WRAP SPLICER SPLICER CR Glue
TEMP PRESS GAP
BOARD RUN ARM TENSION TENSION GAP Gap
URE % STEAM
GRADE SPEED SHOWER
E32B
E32BWT
E32C
E32CWT
200C
E44C
33UM
E48BC
E51BC

15. Sample Recipe For DB GM
Triple Stack / Glue Machine
Top Web Mid Web Bottom
Top GM Btm GM
Temps At Temp At Liner
Glue Gap Glue Gap
Flute Tips Flute Tips Temp
BOARD GRADE Speed
E32B
E32BWT
E32C
E32CWT
200C
E44C 33UM
E48BC
E51BC

16. Sample Recipe Format
Plant C - Flute
LINER TEMP 185-195
GLUE STATION STEAM SHOWER AUTO
METERING ROLL .005 METERING ROLL .015
DB EXIT TEMP 260 LINER SETTING LOW
E&L Web Tension 60 PRESSURE ROLL .017
Target Temp - Top (Flutes) 135 GLUE GAP .0065
Middle (Flutes) N/A CORR. ROLL PRESS. 800
DB Liner 170 Med Tension 120
Liner Tension 170 Liner Tension 170
Zone Temps:330 - 350 - 370 SF Chamber Pressure 26
Infeed Nip Caliper .250
E32C Paper Comb
Machine Speed 800 Med. Type