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Delve deeper into our technical insights and give your strategy direction. Discover in detail how we take care of everything, what core values typify our modus operandi and how we shape the future.

Insights & Innovation

Paper & Cardboard industry Magazine - NL
Paper & Cardboard industry Magazine - NL
PDF - 8,2 MB
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Paper & Cardboard industry Magazine - EN
Paper & Cardboard industry Magazine - EN
PDF - 8,2 MB
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Paper & Cardboard industry Magazine - FR
Paper & Cardboard industry Magazine - FR
PDF - 8,2 MB
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Whitepaper CO2 reduction NL
Whitepaper CO2 Reduction NL
PDF - 3,5 MB
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Whitepaper CO2 reduction EN
Whitepaper CO2 Reduction EN
PDF - 3,6 MB
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Whitepaper CO2 reduction FR
Whitepaper CO2 Reduction FR
PDF - 2,9 MB
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Brochures

Service Contracts EN
Service Contracts
PDF - 1,6 MB
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Servicecontracten NL
Service Contracten
PDF - 1,6 MB
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Contrats de Services
Contrats de services
PDF - 1,6 MB
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Sustainability

Sustainability Report 2025
Duurzaamheidsrapport Callens NL
PDF - 14 MB
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Branding

Brand Book - Callens
Brand Book - Callens
PDF - 11 MB
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Logo Callens
Logo Callens
SVG - 3 KB
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Logo Optimum
Logo Optimum
SVG - 10 KB
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Logo Cometi
Logo Cometi
SVG - 7 KB
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Logo Jonker
Logo Jonker
SVG - 6 KB
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Insights & innovation

Download our magazine for the paper and cardboard industry

Where does the paper and cardboard industry get its energy from? A practical guide to decarbonizing your production process

Download the magazine
Mockup Magazine N1
Callens Whitepaper CO2 reductie mock up NL HR WEB

Download our Decarbonization White Paper

CO2 reduction in the manufacturing sector

Download the White Paper

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