The response of commercial wheat straw soda-AQ pulps to both laboratory beating and commercial refining was observed versus three hardwood (acacia, aspen, eucalyptus) and two softwood (spruce, radiata pine) market kraft pulps. Tested parameters include Canadian Standard Freeness, PQM fibre length distribution, shive content, handsheet strength (tear, tensile, stretch, burst, TEA), Bendtsen roughness and air permeability. Blend systems containing wheat, hardwood and softwood pulps at constant refiner specific energy were also prepared and tested in order to observe the impact of wheat pulp substitution on the physical characteristics of the blend. For the wheat-aspen-spruce system, blends were also prepared when the refiner specific energy for each furnish was different, providing additional insight into the commercial application of blends containing wheat pulp. Due to the lower bleached brightness of the sourced wheat straw pulp versus the wood pulps, comparison of optical properties was not possible.
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