The effect of using deinked mixed office waste pulp on the properties of Alkaline Proxide Mechanical Pulp from cotton stalk

The present study was carried out aiming to investigate The effect of using Deinked Mixed Office Waste Paper (MOW) on the properties of Alkaline Proxide Mechanical Pulp (APMP) from cotton stalk. In order to APMP pulps was prepared using chelating agents such as Na2SiO3 and DTPA (control sample) and without these agents in two-stage pulping with L/W ratio 6:1(ml/g), 20 minutes and 70 0C for first stage, 60 minutes and 75 0C for second stage. Also, pulp was prepared from mixed office waste paper, which were deinked with conventional flotation and then separately refined up to about 300 ( CSF,ml ) freeness. The handsheets were made from control sample pulps, APMP without chelating agents, MOW deinked pulp and mixing 10%, 20% this pulp with control APMP. Physical and mechanical properties were determined using TAPPI standard methods. Deinked pulp of MOW had the maximum values of density, brightness, strength properties and APMP pulp without chelating agents had the minimum values . Among mixed pulps, APMP pulp having 20% deinked MOW pulp had the maximum value of density, brightness, burst index and tear index.