アミノ樹脂はフェノール樹脂とともに熱硬化性樹脂を代表する樹脂で, 主としてユリア樹脂, メラミン樹脂に大別される。
用途別にアミノ樹脂を見ると, ユリア樹脂は接着剤用を主に成形材料用, その他に分類される。メラミン樹脂も接着剤用を主に塗料用, 成形材料用, 化粧板用, その他に分類される 。
本稿ではその中の成形材料用に着目して, その市場動向と技術開発動向について概説する。

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Two coal-stokers and three oil-burners (simple pressure-atomization type) have been tested in the same No.1 test boiler of our laboratory, and the detailed performance curves of those stokers and burners were obtained, concluding with the following considerations : (1) at the point of the best efficiency, the oil-burners were better than coat-stokers. (2) The working ranges of oil-burner were narrower than those of coal-stoker. (3) The excess air ratio of oil-burner at the best efficiency was smaller that of coal-stoker. (4) In the case of oil burning there were certain best density of smoke that gives best efficiency. The facts thus found are those commonly known already, but these results of our laboratory test give the exact and detailed deta and consideration for the comparison of the performance of oil-burner and coal-stoker, since the test was conducted with the same boiler under the same conditions.

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The fracture toughness of glass-fiber-reinforced thermosetting resin, molded by the transfer molding process is measured experimentally. The glass fiber is oriented unidirectionally near the surface of the plate and randomly inside the plate. The specimen is modeled by the two-layer model. The fracture toughness is measured using three-point bending specimens with different thicknesses. They are made by cutting off the surface of the bulk plate. The specimen made of the surface layer shows higher fracture toughness than that made of the central part. Three-dimensional FEM analyses are conducted considering the difference of the fiber orientation. It is found that the existence of the surface layer in the thickness direction has little effect on the fracture toughness, and that in the width direction increases the apparent fracture toughness. Residual stress distributions in the plate are measured by the layer removal method, coupled with the FEM calculation. The effect of residual stress is studied by two-dimensional FEM. It is shown that crack tip stress decreases with residual stress, which agrees with the experimental results qualitatively.

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