GRA 324 Midterm: GRA324 Cobb Test 11 Instrumentation .docx
12 Dec 2013
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Test # 11 water absorption of paper cobb test. Paper has varying degrees of porosity due to its composition of unsystematic felted layers of fibre. Water absorbency a measure of the amount of water absorbed by the wetted surface of paper and board materials. (leatherdale, n. d. ) Sizing the treatment of paper with materials or chemicals to impart the resistance to water, oils and other fluids, to seal down its surface fibers, and to improve its surface strength (wilson, 1998) It is expected that all of the different types of paper will increase in weight due to the water absorbed by the paper"s fibres. Also, just by knowing the paper types, we can hypothesize that the uncoated papers will have a lesser mass compared to coated. Paper manufacturers have to meet the technical requirements of the papermaking process in order for different types of paper to be reproduced in a way that meets a customer"s expectations.
