design and analysys of ind. experiments
TRANSCRIPT
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Design and Analysis of
Industrial ExperimentsStatistica in azienda, Statistici in azienda
Padova Complesso Santa Caterina15 Giugno 2010
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ExternalTarantino-Leardi / Jun 2010
Design and Analysis of Industrial ExperimentsAgenda
Introduction of Tetra Pak
Statistics at Tetra PakStatistics support to PD process:
V-model approach
DOE at Tetra PakConsumer satisfaction case study
Process parameter optimization case study
Key messagesQuestions & Answer
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Processing solutions Packaging solutions Distribution solutions
Tetra Pak is a systems supplier of
Design and Analysis of Industrial Experiments
Tetra Pak Introduction
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Present in morethan 170 countriesacross 5 continents
42 packagingmaterial plants
11 R&D units
11 machineassembly plants
Tetra Pak is global and works locally
Design and Analysis of Industrial Experiments
Tetra Pak Introduction
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Development & Engineering
No. of employees
Lund, Sweden 1031
Modena, Italy 466Stuttgart, Germany 19
Romont, Switzerland 26
Other locations 4
Design and Analysis of Industrial Experiments
Tetra Pak Introduction
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2009Carton packaging material, mio packs 145,030
Distribution machines 1,113
Packaging machines 351
Processing units 1,699
Total world deliveries
Design and Analysis of Industrial Experiments
Tetra Pak Introduction
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Machines in operation
Tetra Pak Group, January 2010
51,859 processing units
9,048 packaging machines
16,641 distribution machines
Design and Analysis of Industrial Experiments
Tetra Pak Introduction
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Todays package portfolio
Design and Analysis of Industrial Experiments
Tetra Pak Introduction
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ExternalTarantino-Leardi / Jun 2010
Design and Analysis of Industrial ExperimentsAgenda
Introduction of Tetra Pak
Statistics at Tetra PakStatistics support to PD process:
V-model approach
DOE at Tetra PakConsumer satisfaction case study
Process parameter optimization case study
Key messagesQuestions & Answer
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Design and Analysis of Industrial Experiments
Statistics at Tetra Pak
Andmanyotherthings
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Design and Analysis of Industrial ExperimentsAgenda
Introduction of Tetra Pak
Statistics at Tetra PakStatistics support to PD process:
V-model approach
DOE at Tetra PakConsumer satisfaction case study
Process parameter optimization case study
Key messagesQuestions & Answer
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CustomerCustomer
DefineDefine
SystemSystem
RequirementsRequirements
ConfirmConfirm
RequirementsRequirementsFulfilledFulfilled
RequirementsRequirements
CascadeCascade
IntegrationIntegration
DetailedDetailed
DesignDesign
ArchitectureArchitecture
DesignDesign
VerificationVerification
PhysicalPhysical
ValidationValidation
Integration Tests
Validation Tests
Unit Test
Module Test
Verify linesVerify lines
consistencyconsistencyState of the art?Market research & screening
Commissioning
SPC at customer site
Requirements validation Screening & system simulations
VVT Strategy
Preliminary assessments Screening & Virtual verification
VVT Plan & Robust Design
Modules verification:Screening & Optimization
Concept evaluation, trade studiesScreening and confirmation
Unit testing
Verify system requirements: optimization
Validate the systemOptimization
andRobustness verification
Confirmation runsCombined with SPC
Root cause analysis& continuous improvements
Screening
Robust Design
Design and Analysis of Industrial ExperimentsStatistical support to PD process: DoE within V-model
State of the art?Market research & screening
CommissioningSPC at customer site
Verify system requirements: optimization
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CustomerCustomerneedsneeds
DefineDefine
SystemSystem
RequirementsRequirements
ConfirmConfirm
RequirementsRequirements
FulfilledFulfilled
RequirementsRequirements
CascadeCascade
IntegrationIntegration
DetailedDetailed
DesignDesign
ArchitectureArchitecture
DesignDesign
VerificationVerification
PhysicalPhysical
ValidationValidation
Verify linesVerify lines
consistencyconsistency
Reqsverifiable?
Ready toVerify, Validate
And test?
State of the art?
SystemVerified?
SystemValidated?
Risk scenarioWhat is in
what is out?
SystemConsistentlyOperating?
Remainingareas
for improvement& issues
Design and Analysis of Industrial ExperimentsStatistical support to PD process: Decision process
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ExternalTarantino-Leardi / Jun 2010
Design and Analysis of Industrial ExperimentsAgenda
Introduction of Tetra Pak
Statistics at Tetra PakStatistics support to PD process:
V-model approach
DOE at Tetra PakConsumer satisfaction case study
Process parameter optimization case study
Key messagesQuestions & Answer
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Consumer Satisfaction
of opening systemCase study
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ExternalTarantino-Leardi / Jun 2010Tetra Pak Internal
Tarantino/May 09
The aim of this study was to identifythe parameters that optimize theperformance and the customersatisfaction
Packaging types, dimensional,sensorial and sociological factorswere studied.
Design and Analysis of Industrial
ExperimentsDOE at Tetra Pak ConsumerSatisfaction case study
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This activity is part of the product test & consumersatisfaction activity during concept development phase.
Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
1. A trade study furnishes the feasibilitytest cases that fit the targeted usagescenarios.
2. Instrumented mock-ups aremanufactured in order to exercise the
alternative opening systems3. A representative set of consumers
from the addressed population isselected.
4. A short training set is proposed to
every consumer and successive 5randomized openings.
5. Subjective satisfaction index andobjective opening performance areregistered and analyzed.
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
FACTORS UNDER STUDY Dimensional
Sensorial: different grips
Competitors: Carton vs. Bottle
Sociological: age & gender
Dimensional: height &diameter
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
Due to subjective evaluations and low cost of the single test a mixed fullfactorial testing with multiple mid-points was planned and executed in orderto eliminate risky confounding and assess single users biases.
Each consumer opened 5 consecutive randomized mock-ups afterone or two training openings on the mid-points.
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case studyThe two main responses evaluated are characterized by:
Opening force: objective, continuous, normally distributed
Consumer satisfaction: Subjective, semi-quantitative and comparative:
To determine the number of replicates in the experiment we used thepower function on the base of historical information in order to optimizingthe chances to identify at least one grade on the satisfaction scale.
The sampling so determined was more than sufficient to characterize the
opening force characteristics.
Min. Max satisfaction
0 1 2 3 4 5
X1X4X2 X0X3 X5
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
Note: the runs are here not randomized but in reality they are. The responses areartificially changed for confidentiality reasons
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
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Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
Bottles Carton
The green area inside the plot shows the range of diameter andheight where the criteria: appraisal 2.5-5 and a reasonable torque areboth satisfied. In the yellow one only one of the two responses is fitsthe criteria.This plot is used to find the best operating conditions for getting the
desired dimensions of the cap.
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The final configuration for the openingsystem design to achieve the target of thisstudy is:
Height: 20.35 mm
Diameter: 39.5 mm
Grip: G2 (not practically relevant)
Grip is not practically relevant and so it was
settled up to the state of the art withoutfurther developments.
Design and Analysis of Industrial Experiments
DoE at Tetra Pak Consumer Satisfaction case study
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CustomerCustomer
DefineDefine
SystemSystem
RequirementsRequirements
ConfirmConfirm
RequirementsRequirements
FulfilledFulfilled
RequirementsRequirements
CascadeCascade
IntegrationIntegration
DetailedDetailed
DesignDesign
ArchitectureArchitecture
DesignDesign
VerificationVerification
PhysicalPhysical
ValidationValidation
Integration Tests
Validation Tests
Unit Test
Module Test
Verify linesVerify lines
consistencyconsistency
Design and Analysis of Industrial ExperimentsStatistical support to PD process: DoE within V-model
State of the art?Market research & screening
Verify system requirements: optimization
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Process parameteroptimization
Case study
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InternalTarantino/Nov.09Tetra Pak Internal
Tarantino/May 09
The aim of this study was tooptimize the injection mouldingprocess parameters to producecaps according to the dimensions
identified in the previous study.In particular, cap-lid diameter and
cap total height were studied.
Design and Analysis of IndustrialExperiments
Process parameter optimization
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The injection moulding is a manufacturing process forproducing parts from thermoplastic material.
Design and Analysis of Industrial Experiments
DOE at Tetra Pak Process parameter optimization
1. Granules of plastic powder are pouredor fed into a hopper
2. A heater heats up the tube and when itreaches a high temperature a screwthread starts turning.
3. A motor turns a thread which pushesthe granules along the heater sectionwhich melts then into a liquid.
4. The liquid is forced into a mould whereit cools into the desired shape (in thiscase a cap).
5. The mould then opens and the unit isremoved.
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INJECTION TIME: Time for the injection of the polymer into the mold cavity
INJECTION TEMPERATURE: Temperature at which the heater heats up the tube
HOLDING PRESSURE: Pressure applied by the screw to compensate the shrinkage of theplastic part
HOLDING TIME: Time at which the screw applied the holding pressure
COOLING TIME = Time to transform row plastic material into desired part
Design and Analysis of Industrial Experiments
DOE at Tetra Pak Process parameter optimization
FACTORS UNDER STUDY
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Design and Analysis of Industrial Experiments
DOE at Tetra Pak Process parameter optimization
543 bar407 barHolding pressure
1.2 s0.8 sHolding Time
1.1C0.9 CCooling temperature
250 C230 CInjection temperature
0.4 sec0.2 secInjection time
High level (+1)Low level (-1)
For each one of the factors, 2 levelswere studied, a high leveland a low level. We call these levels by 1 and +1 respectively(or just and +).
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
3 additional midpoints wereadded.
They are used to learnsomething about non-lineareffect and to limit the effortof replications
-1 0 1
-1
0
1
With 5 factors and 16 runs wehave a resolution V factorialdesign, i.e. main effects would
be confounded with four-factorinteractions, and two-factorinteractions would beconfounded with certain three-factor interactions.
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
0.020.010.00-0.01-0.02
1.0
0.8
0.6
0.4
0.2
0.0
Effect
Power
A lpha 0.05
StDev 0.002
# Factors 5# C orner Pts 16
# Blocks none
# Terms O mitted 0
C enter Points Yes
Term Included In Model
A ssumptions
1, 3
Ctr Pts Per Blk
Reps,
Power Curve for 2-Level Factorial Design
To determine the number of replicates in the experiment we used thepower function
Power function is a function of the probability to reject a certain
hypothesis
Significance level: 0.05,risk to reject the
hypothesis that the Effectis zero despite the fact thatit is. (Type I risk)
Relevant difference: If the effect
is 0.02 we want to detect it
Sample size
needed.
Question: What is thesize of difference in theresponse that we want
to be able to detect(practical relevance)
With such lowvariations in the
experiment 1replicate per runis good enough
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
RESPONSESFACTORSRUN
39.50320.299475112400.319
39.49920.301475112400.318
39.49920.301475112400.317
39.71320.4025431.21.12500.416
39.46320.2994071.21.12500.215
39.57820.3044071.21.12300.414
39.58920.4005431.21.12300.213
39.57520.2894071.20.92500.412
39.57620.3845431.20.92500.211
39.71220.3915431.20.92300.410
39.45920.2844071.20.92300.2939.40220.2154070.81.12500.48
39.40320.3045430.81.12500.27
39.53220.3085430.81.12300.46
39.28720.2114070.81.12300.25
39.52820.2965430.80.92500.44
39.28420.1944070.80.92500.23
39.40720.2024070.80.92300.42
39.40220.2935430.80.92300.21
DHHolding pressureHolding timeCooling timeInj. TempInj. Time
Note: the runs are here not randomized but in reality they are. The responses areartificially changed for confidentiality reasons
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Randomizing the order of the runs is usually good.
It is some kind of insurance that our conclusions will not be
affected by uncontrolled variation of the test environment.
but randomization is not always easy or even possible
Drawbacks with randomization:
Some factors are hard and time consuming to change
The number of changes of factor levels might in itself be timeconsuming
It might get difficult to keep track of the experiments.
Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
0.40.30.2
39.60
39.55
39.50
39.45
39.40
250240230 1.11.00.9
1.21.00.8
39.60
39.55
39.50
39.45
39.40
543475407
Inj. Time
Mean
Inj. Temp Cooling time
Holding time Holding pressure
Corner
Center
Point Type
Main Effects Plot for DData Means
0.40.30.2
20.350
20.325
20.300
20.275
20.250
250240230 1.11.00.9
1.21.00.8
20.350
20.325
20.300
20.275
20.250
543475407
Inj. Time
Mean
Inj. Temp C ooling time
Holding time Holding pressure
Corner
Center
Point Type
Main Effects Plot for HData Means
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
250240230 1.11.00.9 1.21.00.8 543475407
20.4
20.3
20.220.4
20.3
20.220.4
20.3
20.220.4
20.3
20.2
Inj. Time
Inj. Temp
Cooling time
Holding time
Holding pressure
0.2 Corner
0.3 Center
0.4 Corner
Time
Inj.
Point Type
230 Corner
240 Center
250 Corner
Temp
Inj.
Point Type
0.9 Corner
1.0 Center
1.1 Corner
time
Cooling
Point Type
0.8 Corner
1.0 Center
1.2 Corner
time
Holding
Point Type
Interaction Plot for HData Means
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
250240230 1.11.00.9 1.21.00.8 543475407
39.6
39.5
39.4
39.6
39.5
39.4
39.6
39.5
39.4
39.6
39.5
39.4
Inj. Time
Inj. Temp
Cooling time
Holding time
Holding pressure
0.2 Corner
0.3 Center
0.4 Corner
TimeInj.
Point Type
230 Corner
240 Center
250 Corner
Temp
Inj.
Point Type
0.9 Corner
1.0 Center
1.1 Corner
time
Cooling
Point Type
0.8 Corner
1.0 Center
1.2 Corner
time
Holding
Point Type
Interaction Plot for DData Means
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
180160140120100806040200
99
95
90
80
70
60
50
40
30
20
10
5
1
Standardized Effect
Percent
A Inj. T ime
B Inj. Temp
C C ooling time
D Holding time
E H olding pressure
F a ct or N am e
Not Significant
Significant
Effect Type
AE
E
D
A
Normal Plot of the Standardized Effects(response is D, Alpha = 0.05)
200150100500
99
95
90
80
70
60
50
40
30
20
10
5
1
Standardized Effect
Percent
A Inj. T ime
B Inj. Temp
C C ooling time
D Holding timeE H olding pressure
F a ct or N am e
Not Significant
Significant
Effect Type
DE
E
D
C
A
Normal Plot of the Standardized Effects(response is H, Alpha = 0.05)
BD
AD
BE
BC
AB
CD
AE
AC
CE
B
DE
A
C
D
E
200150100500
Term
Standardized Effect
4.3
A Inj. Time
B Inj. Temp
C C ooling time
D Holding time
E H olding pressure
F a cto r N am e
Pareto Chart of the Standardized Effects(response is H, Alpha = 0.05)
AB
BD
AD
BE
BC
CE
AC
CD
B
C
DE
AE
A
E
D
180160140120100806040200
Term
Standardized Effect
4.3
A Inj. T ime
B Inj. Temp
C Cooling time
D Holding time
E H olding pressure
F a cto r N am e
Pareto Chart of the Standardized Effects(response is D, Alpha = 0.05)
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
D i d A l i f I d i l E i
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
Holding time
Holdingpressure
1.21.11.00.90.8
540
520
500
480
460
440
420
Inj. Time 0.2
Cooling t ime 0.9
Hold Values
>
< 20.20
20.20 20.24
20.24 20.2820.28 20.32
20.32 20.36
20.36
H
Contour Plot of H vs Holding pressure, Holding time
Holding time
Holdingpressure
1.21.11.00.90.8
540
520
500
480
460
440
420
Inj. Time 0.2
Cooling time 0.9
Hold Values
>
< 39.30
39.30 39.35
39.35 39.40
39.40 39.45
39.45 39.50
39.50 39.55
39.55
D
Contour Plot of D vs Holding pressure, Holding time
D i d A l i f I d t i l E i t
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
The white area inside the plotsshows the range of holding time
and holding pressure where thecriteria for both responsevariables are satisfied.
This plot is used to find the best
operating conditions for gettingthe right height and the rightdiameter of the caps
Holding time
Holdingpressure
1.21.11.00.90.8
540
520
500
480
460
440
420
Inj. Time 0.2
Cooling time 0.9
Hold Values
20.3
20.38
H
Contour Plot of H
Holding time
Holdingpressu
re
1.21.11.00.90.8
540
520
500
480
460
440
420
Inj. Time 0.2
Cooling time 0.9
Hold Values
39.3
39.55
D
Contour Plot of D
D i d A l i f I d t i l E i t
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Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
Design and Anal sis of Ind strial E periments
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The final configuration for the injectionmoulding process to achieve the target ofthis study is:
Injection time: 0.21 sec
Cooling time: 1.10 sec
Holding time: 1 sec
Holding pressure: 407
The injection temperature is unimportantand so it was settled up at 230 C
Design and Analysis of Industrial ExperimentsDOE at Tetra Pak Process parameter optimization
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Design and Analysis of Industrial Experiments
Agenda
Introduction of Tetra Pak
Statistics at Tetra Pak
Statistics support to PD process:V-model approach
DOE at Tetra PakConsumer satisfaction case study
Process parameter optimization case study
Key messages
Questions & Answer
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Design and Analysis of Industrial Experiments
Key messages DoE increases value of the overall system life-cycle planned activity
Careful preliminary tests maximise the successas a part of proper planning.
DoE design is easy but proper planning,randomization, preparation and execution is
another game. DoE is not the Panacea to clarify all theuncertanties characteristics of the system duringthe development.
DoE complements very well with the majority ofthe other statistical techniques.
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Design and Analysis of Industrial Experiments
Agenda
Introduction of Tetra Pak
Statistics at Tetra Pak
Statistics support to PD process:V-model approach
DOE at Tetra PakConsumer satisfaction case study
Process parameter optimization case study
Key messages
Questions & Answer
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Design and Analysis of Industrial Experiments
Question & Answer
Who should you contact
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Who should you contact
Pietro Tarantino
Expert Advisor
D&E - Packaging Technology
Engineering ExcellenceSystems Engineering Methodology
[email protected]+39 059898389
To know more and keep updated
Carlo LeardiExpert Advisor
D&E - Carton Value
Systems EngineeringSystems Engineering Validation
[email protected]+39 059898389
www.tetrapak.com
Th k f i !
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Thank you for attention!
Turning used cartons into an asset
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Turning used cartons into an asset
Collected cartons Repulping
Pulp
Poly/Al
Products
Products
TP1137, JH/200903
Separating paperboard from plastic and aluminium
Recycled cartons a valuable asset
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Recycled cartons a valuable asset
Trays Household tissue
Paper bags
Egg cartons
Cardboard
Envelopes Paper cores Plasterboard liner
Frozen food boxes Industrial tissue Office paper
Dry food boxes
TP1138, JH/200903
Raw material for a wide range of new products
Recycling a growing industry
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Recycling a growing industry
33% of beverage cartonsrecycled in EU (2008)
18.7% Tetra Pak cartonsrecycled world-wide (2009)
We actively supportincreased recycling andconsumer awareness
TP1113, JH/201002
Ensuring efficient re-use of valuable resources