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Solid unbleached board

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Solid unbleached board
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Solid unbleached board, also known as SUB, is a grade of paperboard typically made of unbleached chemical pulp. Most often it comes with two to three layers of mineral or synthetic pigment coating on the top and one layer on the reverse side. Recycled fibres are sometimes used to replace the unbleached chemical pulp.[1]

Thumb
SUB construction:
1 – Coating
2 – Solid Unbleached Board
Not drawn to scale

The main end use for this type of board is for packaging of frozen or chilled food, beverage carriers, detergent[2] cereals, shoes, toys and others.[3]

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