2006-12-17 00:11:56 · 5 answers · asked by krishnamoorthy m 1 in Science & Mathematics ➔ Botany
Normal paper is less porous and more dense. The more "sponge" like the better the absorption
2006-12-17 00:14:45 · answer #1 · answered by firefly 5 · 0⤊ 0⤋
Very interesting question.
The difference in properties in normal paper and tissue paper is due to a treatment to the fiber during paper making to improve its water absorbing/repelling properties called "sizing"
"Sizing" is a substance that is applied to fibers during paper manufacture in order to curb their tendency to absorb liquids by capillary action. By doing so, sizing keeps the ink on the surface of the paper where it was intended to remain.
In addition, sizing affects abrasiveness, creasibility, finish, printability, smoothness, and surface bond strength, and decreases surface porosity and fuzzing.
There are three categories of papers with respect to sizing: unsized (water-leaf), weak sized (slack sized), and strong sized (hard sized).
1) Waterleaf has low water resistance and includes absorbent papers for blotting, paper towels and tissue paper.
2) Slack sized paper is somewhat absorbent and includes newsprint, while
3) hard sized papers have the highest water resistance.
There are two major types of sizing: engine (rosin) and surface (tub).
i) Rosin is an amphipathic molecule, having both hydrophilic (water-loving) and hydrophobic (water-repelling) ends. Rosin sizing is applied to almost all papers and especially to all those that are machine made. The rosin coats the paper fiber and forms a film, with the hydrophilic tail facing the fiber and the hydrophobic tail facing outwards. This creates a water-repellent situation, which causes the water-based ink to remain outside on the paper surface.
ii) Tub sizing consists of gelatin glue and / or starch and is generally only used for handmade papers. Tub sizing is added for the highest grade bond, ledger, and writing papers.
Best wishes
2006-12-17 01:54:12 · answer #2 · answered by Ash 2 · 4⤊ 0⤋
The capillary action is more in tissue paper than normal paper. so its absorbence is more than normal paper.
2006-12-17 00:47:06 · answer #3 · answered by Lalitha 2 · 1⤊ 0⤋
because the normal paper paper doesn`t has many pores while tissue paper has many pores to absorb
2006-12-18 03:05:14 · answer #4 · answered by Anonymous · 0⤊ 0⤋
tissue paper absorbs water as it is soft and compactly packed molecules are not seen the have more poresin them .....so absorb the water by the process of OSMOSIS the paper has tightly packed molecules so they do not absorb water....
2006-12-19 23:58:37 · answer #5 · answered by vimalin j 2 · 0⤊ 0⤋