Sains Malaysiana 39(2)(2010): 239–242
Cationic Starch as a Dry Strength Agent
in Magnetic Papermaking
(Kanji Kation sebagai Agen Kekuatan Kering di dalam Pembuatan Kertas Magnet)
Ainun Zuriyati Mohamed @ Asa’ari*
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 Shamsudin
Material Science Programme,
School of Applied Physics, Faculty of Science and Technology
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia
Mustaffa Abdullah
Physics Programme,
School of Applied Physics, Faculty of Science and Technology
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia
Diserahkan: 28 Mac 2008 / Diterima: 24 November
2008
ABSTRACT
The
mechanical strength of magnetic lumen loaded handsheets was reported to be lower than the unloaded handsheets.
This effect is due to the deposition of filler inside the fiber lumen and some
on the fibre surface which interfere with the fibre to fibre bonding. Hence, in
order to improve the handsheets strength, cationic
starch is used as a dry strength additive. In this study, mixed tropical
hardwood pulps were used throughout the experiment. The magnetite particles
were deposited in the fibre lumen via the lumen
loading technique. The addition of cationic starch was found to increase the handsheet strength. However, it disturbed and influenced
the location and distribution of the magnetic fillers. Some of the magnetite
particles were observed to be displaced from the fiber lumen and pit apertures.
The charges of the filler particles and cationic starch played an important
role in producing charge repulsion and pulling effect which lead to filler
dislocation.
Keywords:
Dry strength agent; lumen loading technique; magnetic paper; papermaking; polyacrylamide
ABSTRAK
Kekuatan mekanik kertas makmal menggunakan teknik pemasukan lumen dilaporkan lebih rendah daripada kertas makmal tanpa pemasukan lumen. Kesan ini adalah disebabkan kemasukan pengisi ke dalam lumen gentian dan terdapat gangguan pada ikatan antara gentian. Oleh itu, bagi memperbaiki kekuatan kertas makmal, kanji kation digunakan sebagai penambah kekuatan. Dalam kajian ini, pulpa tropika campuran digunakan. Partikel magnetit dimasukkan ke dalam lumen melalui kaedah pemasukan lumen. Penambahan kanji kation didapati meningkatkan kekuatan kertas. Namun begitu, penambahan ini telah mengganggu lokasi kemasukan dan taburan pengisi. Terdapat partikel magnet yang tersasar dari kawasan lumen dan bukaan pit. Dipercayai cas partikel magnet dan kanji kation memainkan kesan yang penting untuk menghasilkan gangguan cas dan kesan penarikan yang mengakibatkan kemasukan pengisi yang rendah.
Kata kunci: Agen kekuatan kering; kertas magnet; pembuatan kertas; poliakrilamida; teknik pemasukan lumen
RUJUKAN
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*Pengarang untuk surat-menyurat; email: ainun.introp@gmail.com