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| Extender for Plywood Bonding |
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| 글쓴이 : 관리자
날짜 : 08-09-29 11:49
조회 : 10416
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The Utilization of Corn Stalk, Pine Bark, Pine Leaves, Wheat and Wood-Flour as an Extender for Plywood Bonding <Jour. Kor. For. Soc. 51:41-50 1981> Corresponding author Jin-Heon Kwon kwon@kangwon.ac.kr
The purpose of this study was to evaluate the substitutional possibility of new extender instead of wheat flour, which is extending for p]ywood adhesives in Korea.
As the extending materials corn stalk, pine bark, pitch and Korean pine leaves, wheat, or wood flour were selected and prepared for the extending powders, dried at 103±2℃ during 24 hours in the drying oven, followed by being pulverized into 60-100 mesh powder. The extenders were mixed with urea formaldehyde resin in the ratio of 5,10, 15 or 20%. After plywoods were manufactured by the above extended ratios, dry and wet shear strength and wood failures were analyzed and discussed. The results at the study were summarized as follows:
1) In urea formaldehyde resin dry shear strength in plywood extended by wheat flour showed the highest value. 2) Among the extenders in 10 and 20% extension of urea formaldehyde resin wet shear strength of wood flour was higher than that of wheat powder. They had no significant difference statistically. 3) Among the extenders of 5% extension of water soluble phenol formaldehyde resin dry shear strength of plywood extended by Korean pine leaf powder showed the highest value, while wheat powder showed the highest value among 10,15 and 20% extensions. 4) In water soluble phenol formaldehyde resin the best results of wet shear strength showed in wheat powder. 5) Among the extenders in 15 and 20% extension of water soluble phenol formaldehyde resin, dry and wet shear strength in plywood of corn stalk powder were the highest value next to wheat powder.
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