Sains Malaysiana
39(3)(2010): 441–444
Effect
of Mixed Tropical Hardwood Kraft Pulp and Polyacrylamide Types on Magnetite
Retention in Lumen Loaded Handsheets
(Kesan
Pulpa Kayu Keras Tropika Campuran dan Poliakrilamida Terhadap Retensi Magnetit
dalam Kertas Makmal Lumen Berpengisi)
Ainun
Zuriyati Mohamed*
Laboratory
of Biopolymer and Derivatives, Institute of Tropical Forestry & Forest
Products (INTROP) Universiti Putra Malaysia 43400 UPM, Serdang, Selangor D.E., Malaysia
Sarani
Zakaria, Roslinda Shamsuddin & Mustaffa Abdullah
Materials
Science Programme, School of Applied Physics, Faculty of Science and Technology
Universiti Kebangsaan Malaysia 43600 Bangi, Selangor D. E., Malaysia
Diserahkan:
28 Mac 2008 / Diterima: 22 Disember 2009
ABSTRACT
This
paper reports on the preparation of magnetic lumen loaded handsheets from
bleached and unbleached mixed tropical hardwood kraft pulps. The lumen coating
technique is a physical approach whereby fillers were deposited inside the
fibre lumen. In order to produce magnetically responsive fibres, magnetic
fillers were loaded into the fibre lumen. The magnetic filler chosen was
magnetite which is usually used to make mylar as found in a diskette. Low and high
molecular weights of polyacrylamide (PAM) were used as retention aids. The
effect of different molecular weight of PAM on filler content in the bleached
and unbleached handsheets were studied. The results showed that the amount of
fillers deposited in the pulp fibres increased with increasing molecular weight
of PAM using both pulps. However the bleached pulps gave better lumen loading
than the unbleached when using high molecular weight of PAM.
Keywords:
Lumen loading technique; magnetite; magnetic paper; polyacrylamide
ABSTRAK
Kajian
ini menumpukan kepada penyediaan kertas makmal lumen berpengisi magnet daripada
pulpa terluntur dan tidak terluntur kayu keras tropika campuran. Bagi
menghasilkan kertas magnet yang berfungsi, partikel magnet dimasukkan ke dalam
lumen gentian. Partikel magnet yang dipilih adalah magnetit, yang banyak
digunakan dalam pembuatan mylar di dalam disket. Poliakrilamida (PAM) dengan
berat molekul rendah hingga tinggi digunakan sebagai agen retensi. Kesan
penggunaan PAM dengan berat molekul yang berbeza ini ke atas kemasukan partikel
magnet dikaji. Keputusan menunjukkan kandungan pengisi yang dimasukkan ke dalam
gentian lumen bertambah dengan pertambahan berat molekul PAM bagi kedua-dua
jenis pulpa. Walau bagaimanapun, pulpa terluntur memberikan hasil yang lebih
baik berbanding pulpa tidak terluntur bila PAM dengan berat molekul tinggi
digunakan.
Kata
kunci: Kertas magnet; magnetit; poliakrilamida; teknik pemasukan lumen
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*Pengarang
untuk surat-menyurat: ainun.introp@gmail