A study of the impact on pulp quality of the processing steps used in the conversion of inkjet-printed commercial papers to deinked pulp by two deinking methods.

摘要

Deinking of printed paper materials has become a concern in modern paper recycling streams due to new printing and converting technologies which can introduce challenges to the traditional deinking processing steps. As a means of predicting how well a printed paper substrate will deink, laboratory methods have been devised to test and score the resultant deinked pulp quality, and these test scores can be used to deem a product deinkable or not suitable for deinking. One such method is INGEDE Method 11 (benchtop single loop method), which is a lab-scale test method that was developed to simulate the deinking of offset printed mechanical fiber (newsprint), including supercalendered (SC) and light-weight coated (LWC) wood-containing paper grades.~1 One major limitation of the benchtop single float method is that it incorporates single-loop flotation as the primary processing step for deinking, yet purports to predict deinkability on the basis of this alone.