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TYPES OF CURRUGATED BOARDSGrades of Testliner:%u2022 Testliners are available in different grades based on weight and bursting strength (the ability to withstand pressure). The heavier the testliner (measured in grams per square metre, or GSM), the stronger the material.%u2022 Common grades might include Testliner 2 (a lower grade made primarily from recycled fibres) and Testliner 3 (a slightly higher quality).4. How Fluting and Testliner Work TogetherWhen combined, fluting and testliner form a corrugated board with the following properties:%u2022 Strength: The fluting%u2019s wavy structure adds resistance to compression, while the testliner provides a protective layer.%u2022 Cushioning: The fluting creates air pockets that absorb shocks, protecting the contents during transport.%u2022 Stacking Ability: The combination of fluting and testliner ensures that boxes can be stacked without crushing easily.%u2022 Customisability: Different combinations of fluting sizes and testliner types allow manufacturers to tailor the corrugated board for specific uses, whether it%u2019s for heavy-duty industrial packaging or lightweight consumer goods.5. Types of Corrugated BoardCorrugated boards come in various types, depending on the number of fluting and testliner layers:%u2022 Single-Wall Board: One layer of fluting between two layers of testliner. It%u2019s the most common type for everyday packaging.%u2022 Double-Wall Board: Two layers of fluting sandwiched between three layers of testliner. It%u2019s stronger and used for heavier items.%u2022 Triple-Wall Board: Three layers of fluting with four layers of testliner, providing maximum strength for the heaviest or most fragile items.6. Applications of Fluting / Medium and Testliner%u2022 E-commerce: Smaller flute profiles (like E-flute) are used for retail and online shopping packaging due to their smooth printable surfaces.%u2022 Industrial Packaging: Larger flutes (like A or C) are preferred for packaging heavy or fragile items because of their superior cushioning and stacking strength.%u2022 Food Packaging: White top testliner with smooth surfaces for branding is often used in the food and beverage industry.When testliner is made from virgin pulp it%u2019s called Kraft Liner / KLB, it is much stronger and has an inherent water resistance, it can also be barrier coated to dramatically increase the water resistance.A good example of white top liner (virgin) or white top test liner(recycled) are the Smart copy / Typek copy paper boxes.ConclusionUnderstanding fluting/medium and testliner is crucial in the packaging industry. Fluting provides strength and cushioning, while testliner offers a protective surface for branding and durability. The combination of these components allows for the customization of corrugated boards to suit various packaging needs. The flat layers of paper, usually testliner, are used to make corrugated boxes, which are commonly found in packaging for shipping goods.SINGLEFACEA FLUTE5mmB FLUTE3mmC FLUTE4mmE FLUTE1.6mmF FLUTE0.9mmSINGLE WALL DOUBLE WALL TRIPLE WALL38