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Paper Machine Basis Weight Measurement

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Paper Machine Basis Weight Measurement

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One of the more cost-effective measurements in a paper mill is that which monitors the flow of pulp stock into the head box of the paper machine. The stock level in the head box directly affects the thickness of the stock being laid onto the forming screens and the thickness of the end product. Because there are normally variations in the thickness of the pulp stock as it is laid onto the forming screens, excess stock must be laid on to ensure that a minimum thickness is maintained. Since the finished product is measured by weight, this figure is referred to as the “basis weight” of the product. Basis weight is defined as the weight of 500 sheets of paper cut to a standard size, usually 17” x 22” for bond paper, 25” x 38” for text, offset, and coated papers, and 20” x 26” for cover papers.

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