Knowledge Hub

Insights from the paperboard industry

Technical articles, industry trends, and application guides from the Sowji Papers team.

Technical Guide7 min read

What is Kappa Board? A Complete Guide to Grey Board for Packaging

Everything you need to know about kappa board — what it is, how it is made, what grades exist, and which applications it is best suited for.

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Technical Guide6 min read

Grey Board vs Duplex Board — Which Should You Choose?

A practical comparison of grey board (kappa board) and duplex board for packaging converters — covering stiffness, printability, lamination, and cost.

Production Tips6 min read

How Rigid Boxes Are Made — The Role of Kappa Board

A step-by-step look at rigid box manufacturing — from board selection and scoring to wrapping and finishing — and how kappa board grade affects the final result.

Sustainability5 min read

FSC Certified Paper Board — Why It Matters for Exporters

Why FSC certification on kappa board and grey board is increasingly required by European and North American buyers, and what it means for Indian exporters.

Technical Guide5 min read

Kappa Board Thickness Guide — 1.0 mm to 4.0 mm

Which kappa board thickness is right for your application? A practical guide covering 1.0 mm to 4.0 mm, with GSM equivalents and recommended uses for each size.

Technical Guide5 min read

How to Choose the Right Kappa Board for Your Packaging

A practical guide to selecting the correct grade, thickness, and grammage for rigid box, book binding, and retail packaging applications.

Production Tips4 min read

5 Tips for Better Rigid Box Making with Greyboard

Common pitfalls in rigid box production and how the right board specification can improve yield, reduce waste, and speed up your line.

Sustainability6 min read

Sustainable Paperboard: What Converters Need to Know

How recycled fibre boards are meeting the demands of brand owners committed to sustainable packaging without compromising on performance.

Technical Guide5 min read

Maximising Lamination Adhesion on Kappa Boards

Surface preparation, adhesive selection, and board specification tips for achieving consistent lamination results on rigid box boards.

Industry Insights7 min read

Export Packaging: Board Specifications for International Markets

Understanding burst strength, moisture resistance, and caliper requirements for packaging boards used in export and international logistics.

Industry Insights4 min read

Sivakasi: India's Packaging Powerhouse

A look at how Sivakasi became the hub of India's printing and packaging industry, and what it means for board manufacturers and converters.