Abstract
Rockwool is popularly used as heat insulating material, which can usually be applied being filled in air space of walls as cotton type insulator. Especially the case which the rockwool is installed in walls of cold storage cars was considered and a vibration test was performed to the settling aspects thereof.
Rockwool was filled in a wooden box (Fig. 1) whose total inner height was divided in 10 layers each height 6.08cm, by sheets of thin paper to observe the settling condition. Observation was made from outside through the glass window. The vibration was given by an apparatus utilizing a flow tester of cement mortar (Figs. 2, 3). The last settled conditions were found by 100000-200000 vibrations (Figs. 10, 11, 12). The allowable heights of rockwool when filled in any density before vibration were found (Figs. 14, 15).
5 kinds of rockwool were examined, whose physical and chemical properties were referred, namely, thickness distributions of fibre (Fig. 4), thermal conductivities when filled with the density of about 0.2g/cm3 (Fig. 7), chemical analysis (Table 2), temperature gradients of thermal conductivities regarding void (Fig. 8), were comparatively referred. All the comparative results were shown in Tables 1, 3.
