| Author | Zhang, Wenliang |
| Call Number | AIT Thesis no.PP-07-2 |
| Subject(s) | Waste paper--Recycling
|
| Note | A thesis submitted in partial fulfillment of the requirements for the
degree of Master of Engineering in
Pulp and Paper Technology, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Recycled fibers have low strength and drainage properties compared to virgin fibers, and the main causes are hornification of fibers and high fines content when it is mechanically upgraded. Considering of these two main difficulties, many treatments were taken in recycled fiber paper making. In this thesis work, the most popular, simple, efficacious method was used for recycled fibers treatment and it is wet-end chemical treatment. PAC, cationic starch and silica nanoparticle were used to improve draining and enhance strength properties. PAC was used as anionic trash collector; cationic starch was used to enhance paper strength by improving fiber bonding and control drainage by its super fines absorbing ability; silica nanoparticle could improve both strength and drainage properties by enhancing bonding created by cationic starch. Leo beer boxboards were used as raw material. Local acc was collected from local mill and all data of Local acc came from the master thesis "Quality of LOCC Compared with EaCC and Measures to Improve Its Papermaking Potential" written by Mr. Feng Minrao [13]. Fiber analyzing suggests that recycled, Leo beer boxboards containers have higher fines content and shorter fiber length than Local ace. After pulping and screening, the acc pulps were refined to 380ml freeness for handsheet making. For fiber identification, fiber furnish analyzing, Kajaani-200 fiber analyzing, Bauer-McNett fiber fractionation, Zeta-potential, Canadian standard freeness, ash content and contaminant were also measured and reported. Central Factorial Design Method was used for data analyzing. This method facilitates investigating the influences of cationic starch, silica nanoparticle and PAC on strength and drainage properties. An optimum dosing of these chemicals increased drainage 47%, Scott bond 78%, bending index 28%, zero span index 15%, tensile index 34%, TEA 27% |
| Year | 2007 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Pulp and Paper Technology (PP) |
| Chairperson(s) | Nazhad, Mousa M. |
| Examination Committee(s) | Lehtinen, Esa;Malinen, Raimo 0. |
| Scholarship Donor(s) | Finland - AIT Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2007 |