Operation management

“VNS for glass container industry
Capacitated Lotsizing problem”

B Almada-Lobo1; MA Caravilla1,2; JF Oliveira1,2
1
2

FEUP – Faculdade de Engenharia da Universidade do Porto
INESC Porto – Instituto de Engenharia e Sistemas de Computadores

[e-mail]

MIC 2007, 25th June

MIC 2007

Agenda
1. Glass Container Manufacturing Process
2. Glass Container Industry
3. Long-Term Production Planning
4. A Solution Approach: VNS
5. Conclusions

Bernardo Almada-Lobo

2

MIC 2007

1 Glass Container Manufacturing Process
Three main sub-processes
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Glass Production

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Containers Manufacturing

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Palletising

Raw materials silos Bernardo Almada-Lobo

One supporting sub-process
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Hot-end

Decoration

Cold-end
Quality Control

3

Final Product

MIC 2007

1 Glass Container Manufacturing Process

Reception and Control of Raw Materials
Raw Materials Storage
Filling, Weighting and Mixing

Bernardo Almada-Lobo

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MIC 2007

1 Glass Container Manufacturing Process
Furnace Melting Capacity (tonnes/day) → f (Colour)

Parallel Moulding Machines

Furnaces operate continuously

Moulding machine has four main characteristics:

Furnace output can vary to a limited extent high sequence dependent setup times involved in a colour change → furnace colour specialization
Glass paste colour (amber, flint, green)

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Number of individual sections

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Number of mould cavities per section (single, double or triple-gob machine)

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Distance between the moulds

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Manufacturing process
Blow-blow
Press-and-blow

Not negligible sequence dependent setup times in product changeovers
‘Machine balancing’
Job-splitting not allowed

Bernardo Almada-Lobo

5

MIC 2007

1 Glass Container Manufacturing Process

Inspection
Shipping

Reheating Kiln

Palletising

Surface treatment

Bernardo Almada-Lobo

6

MIC 2007

1 Glass Container Manufacturing Process