Paper making and fiber liberation – Processes and products – Plural fiber containing
Patent
1996-10-18
1998-03-17
Czaja, Donald E.
Paper making and fiber liberation
Processes and products
Plural fiber containing
162 13, 162 21, 162 98, 162225, 428326, 264109, 264124, D01C 102, D21H 1112
Patent
active
057282692
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a board such as a particle board and a fiber board using a Malvaceous bast plant as the raw material and a method for producing thereof.
BACKGROUND TECHNOLOGY
It had been well known for a long time a board could be produced by merely heating and pressurizing small fragments of a lignocellulosic material without using adhesive agent. This method depends mainly on the intertwinding of the lignocellulosic fibers or the hydrogen bond between the fibers, and since the chemical adhesion of the lignocellulosic material is small; thus the strength performance of the product is highly inferior.
Regarding the method for producing the board using the chemical adhesion effect of the lignocellulosic material, two methods are known, one is a method of utilizing a component of a natural plant and the other is a method of converting a part of the lignocellulosic material into an adhesive material by a high-temperature and high-pressure steam treatment.
As to the former method, Japanese Patent Application 59-14338, the production of a board, in which pulverized plant leaves are used as an alternative for an adhesive. Moreover, Japanese Patent Application, First Publication No.S60-30309 of 1985 discloses a method for the production of a board, in which a lignocellulosic substance containing a large amount of a free saccharide is used as the raw material. As such a lignocellulosic material disclosed are the sugar cane bagasse, African millet stalk, the corn stalk, the sunflower stalk, and the flax stalk. Furthermore, Japanese Patent Application, Second Publication No.H3-31565 of 1991 discloses a method for the preparation of a board in which a saccharide or a starch is added as an adhesive, although they are not necessarily a lignocellulosic substance.
The latter method by treating in high-temperature and high-pressure steam is disclosed in Japanese Patent Application, First Publication No.S49-74773 of 1971 and No.S60-206604 of 1985 and U.S. Pat. No. 5,017,319.
The method of Japanese Patent Application, First Publication No.S49-74773 of 1971 is characterized in that a wood fiber is treated in the steam at 150.degree. to 180.degree. C. and that the molding temperature is 250.degree. to 280.degree. C. The method of Japanese Patent Application, First Publication No.S60-206604 of 1985 is characterized in that a lignocellulosic material contained in a pressure vessel is heated at a temperature of not lower than 190.degree. C. within a period of 10 minutes by supplying the high-temperature and high-pressure steam to the vessel rapidly and that the molding temperature of the board is made preferably to be 200.degree. to 220.degree. C.
In addition, U.S. Pat. No. 5,017,319 79 is a U.S. patent application corresponding to Japanese Patent Application, First Publication No. 206604 of 1985 and is characterized in that a lignocellulosic material is treated with the high-temperature and high-pressure steam for a sufficient period to decompose the hemicellulose contained in the lignocellulose and to convert the hemicellulose to a water-soluble resin and that the relationship between the preferred steam temperature T (.degree.C.) and the treating period t (seconds) is defined by the following equation:
However, any of the boards prepared by those methods are inferior in the mechanical strength to those prepared by using usual adhesives and are below the level of satisfying industrial requirements comparing the industrial products such as particle boards and fiber boards.
Among the above methods, methods disclosed in Japanese Patent Application, first Publication No.206604 of 1985 and U.S. Pat. No. 5,017,319 require a steaming condition with special equipment such as a steam generator for a pressure of at least 20 kgf/cm.sup.2 and a pressure vessel tolerable to that condition, so that the process is impractical.
The object of the present invention is to provide a mechanically strong board which contains a specified lignocellulosic material and a modified material thereof as the substantial
REFERENCES:
patent: 5017319 (1991-05-01), Shen
patent: 5492756 (1996-02-01), Seale et al.
Kohno Tsuyoshi
Yamaguchi Hiroharu
Czaja Donald E.
Kohno Tsuyoshi
Leavitt Steven B.
Onishi Atsushi
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