Method of Manufacturing an opaque paper using Genus Typha L.

Abstract

The present invention relates to a method of manufacturing an opaque paper by using Genus Typha L. The method includes preparing Genus Typha L. bleached pulp from Genus Typha L. and fabricating a paper from the Genus Typha L. bleached pulp. According to the present invention, the method can provide paper with a low basis weight, even if it includes very little or no mineral charging agent but having high opacity, smoothness, and printability. Since it includes very little or no mineral charging agent, it may not have much deteriorated mechanical strength.

Description

TECHNICAL FIELD [0001]The present invention relates to a method of manufacturing an opaque paper by using Genus Typha L. More particularly, the present invention relates to a method of manufacturing a paper with a low basis weight but having excellent mechanical strength as well as high opacity, smoothness, and printability.BACKGROUND ART [0002]Genus Typha L. is a perennial plant belonging to the Typhaceae family, which includes 9 to 18 species world wide. In Korea, there are three known species, including Typha Orientalis, Typha Angustata, and Typha Latifolia (Choi, 2000; Chung, 1957; Im, 1998; Kim and Choi, 2001; Lee, 1996; Mori, 1922; Nakai, 1911, 1951). Typha Latifolia and Typha Orientalis have one body of a stamen and a pistil, but are easily distinguished by leaf size. However, Typha Angustata has a stamen and a pistil 4 to 6 cm apart from each other, and a small leaf. This Typha Angustata is commonly found all over Korea. In America, they are called broad-leaved cattail (Typh...

AI Technical Summary

Benefits of technology

[0017]Since the Genus Typha L. bleached pulp may have increased mechanical strength and can thereby produce paper with a decreased basis weight, it can contribute to decreasing manufacturing cost.

[0018]In addition, it can be manufactured into paper with higher opacity and better smoothness than wood pulp paper including a mineral charging agent. In addition, since it includes less optical material, it may decrease paper cuts.

[0019]Furthermore, it can improve paper smoothness and printability. In particular, a paper with a low basis weight retains a mineral charging agent at a very low rate, but Genus Typha L. bleached pulp works as a mineral charging agent and helps a mineral charging agent to be well-retained. Accordingly, it can simplify a retention system and decrease the cost.Best Mode

[0020]As the supply of wood has been severely reduced world wide, paper industries are facing the task of simultaneously protecting wood and the environment while producing pulp as a row paper material. In particular, technologies for producing paper pulp from non-woody fibers have garnered attention.

[0021]Non-woody plants for paper pulp include mulberry bast, flax, hemp, cotton plant, rice straw, bagasse, and the like. In general, the non-woody plants include pectin, hemicellulose, and inorganic material in a large amount, but lignin in a small amount. They can be manufactured into pulp in a chemical, semichemical, or mechanochemical method, and can be manufactured into unbleached or bleached pulp under milder conditions than with wood.

[0022]The non-woody pulp may have various characteristics depending on the fiber shape, chemical composition, and kinds and amounts of non-fiber cells. Accordingly, when paper is manufactured of non-woody pulp or by appropriately combining the non-woody pulp with wood pulp, it can have easily-adjustable mechanical strength, durability, electrical characteristics, gloss, dimensional stability, and printability, and can thereby be used in various ways.

Problems solved by technology

This method of manufacturing pulp from wood requires high temperature and pressure and a lot of chemicals.

However, a mineral charging agent can still be considerably lost in a paper with a low basis weight or an express sheet-forming process in spite of this treatment.

When a mineral charging agent remains low, it may block a felt for paper, contaminate a white water system, and increase raw material cost.

However, when it is overused, the paper may have deteriorated mechanical strength and thereby may not be recycled.

In addition, a paper with low a basis weight may not be sufficiently charged with a mineral charging agent.

However, this mineral charging agent may deteriorate paper strength.

Further, when used to manufacture paper with a low basis weight or express paper, it may easily cause contamination due to friction.

In general, a paper with a low basis weight needs relatively more mineral charging agent for opacity but inevitably has decreased strength.