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Liquid Paperboard (LPB) is a type of cardboard with waterproof qualities. It is used in food packaging.

There are 2 types of LPB - Standard LPB and Aeseptic LPB.

Standard LPB has a layer of plasticising coating the inside of the container. Milk cartons are an example of LPB packaging. The cardboard itself is very high quality and valuable for recycling as long as it can be separated from other grades of paper and cardboard. It requires a longer time in the hydropulping process than normal uncoated cardboard to recover its fibre content. If it is mixed with normal cardboard and paper for pulping it emerges from the process unpulped and has to be disposed of with all the other contaminants from the process.

Aeseptic LPB has a thin aluminum foil lining on the inside surface of the container. Fruit juice and liquid soup packs are examples of aeseptic LPB. The aluminum foil is worth more than the LBP fibres so the highest recovery value is to pulp the material separately and recover the foil from the residual or to recycle the ALPB as aluminum and simple discard the cardboard.

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