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| PDF : |  05030099.pdf |
| title(En) : | Studies of Foaming Adhesives. VII. Durability Test on the Foaming Urea-Resin Glued Plywoods by Using a Weather Meter. |
| author(En) : | Shigeru Mori, Sumio Imura |
| information : | Mokuzai Gakkaishi 5(3), 99-101 (1959) |
| assort : | Original Article |
| summary(En) : | Durability of foaming urea-resin glued plywoods and the common extended urea-resin glued plywoods have been studied. Durability test was carried out by using an open-type weather meter. One group of test samples was of standard shear test size, the other 8 × 15 cm size. The former test pieces were exposed for 0, 24, 48, 96, 144 and 216 hours, the latter for 0, 24, 96, 216, 336 and 432 hours. Table 1 illustrates the components of the glue and the condition of making plywoods. Fig. 1 shows the adhesive strength of the test pieces taken from the 8 × 15 cm samples, and Fig. 2 shows that of the standard shear test pieces. The results obtained are as follows: 1) For the purpose of estimating the durability of glue joint, the smaller size sample was found to be suitable for the weather meter test. The adhesive strength of the larger size (i.e. 8×15 cm) does not fall so rapidly that it takes considerably long time to gain an appreciable fall as shown in Fig. 1. 2) There was not any remarkable difference upon the durability between the foaming urea-resin glued plywoods and that of the common extended urea-resin glued. 3) As regards the wood failure, the excellent durability of urea-melanin-condensated resin glue is preferably to that of urea-resin glue. 4) Appreciable differences between wheat powder and soybean powder as the suitable extender could not be recognized in the small quantity used of them. |