Available Services - Papermaking
Papermaking
The PDC's pilot paper machine is available for raw material and process operation studies as well as to evaluate equipment components. Steady state is reached in less than 30 minutes allowing multiple trials in a single day.
Beating and Refining
Refining is a critical operation where the inherent properties of the paper are developed. UMaine has two double disc refiners (13-in.; 20-in.) both equipped with variable speed motors. The refiner loop is connected to several tanks for refining studies in the recirculation or single pass mode. A conical refiner is also available for use. The refiners, along with a beater, allow for a range of refining prior to papermaking as well as for a comparison of the benefits provided by each type of machine.
Screening and Fractionation
Pulp impurities arising from wood or external sources can be separated based on size, shape, specific gravity, and specific surface differences. Centrifugal cleaners are arranged to allow for performance evaluation under typical operating conditions and a pressure screen can remove over-size foreign bodies. Our Centri-sorter can be operated under a wide variety of conditions.
Gate Roll Coater / Size Press
A gate roll coater / size press is an option in the operation of the pilot paper machine. This piece of equipment allows for the addition of surface sizing as well as light coating on the basesheet.
Calendering
Calendering improves printing properties, particularly roughness and gloss. The values attained depend on the speed, pressure, and temperature of calendering, the base sheet, the average moisture content, and the composition of the coating. An on-line calender stack is available at the end of the paper machine.