Abstract
It is well known fact that a blood has excellent glueing strength and water proof as a glueing material.
The writer is now carrying out the experiments on the strength and water proof of the glueing materials, and on the relation of the glueing temperatures, times of press, and power of pressure to the glueing strength. As the samples, bloods of horse and ox were used in the experiments. After the blood completely separated to two parts of resum and blood-cake, each of them was dried up respectively. The dried serum was named as “serum glue”, the dried blood-cake as “blood-cake glue”, and the blood powder as “entire blood glue”.
The ply-woods which were made using the three kinds of glue were tasted in the experiments. The tested pieces of the ply-wood were soaked for 4 hours in the hot water with 50°C., and then dried in air for 24 hours. The results obtained from the experiments ars as follows.
The blood-cake and the entire blood glues seem to have a greater glueing. strength than the serum glue.
2. When the ply-wood is made by use of three veneers, each having the thickness of 1.3mm., the following conditions are necessary:-
(a) the time of press: 5 minutes; (b) the temperatnre of glueing: 100°C.;
(c) pressure: 10kg/cm2.
3. The glueing materiales made with blood of horses and oxen seem to have a greater strength of water-proof.
4. The water-proof of the glueing materials seems to be increased with addition of the cuprous salt, especially remarked increased in the case used blood-cake glue.
