| Title |
Technical Notes on manufacturing of a Paper - making Dryer |
| Abstract |
Through the anther`s experiences on manufacturing of over forty paper-making dryers an optimum condition was drawn out. Although the shape of a dryer shell appears very simple, there are lots of difficulties in practical manufacturing such as composition and microstructure control for physical and mechanical requirements of a paper dryer. Sorbite structure is recommended as the most foreign makers prefer. The optimum allowances of shell shrinkage and machining are 8/1000 and l0㎜ out diameter (5㎜ inside dia)respectively. Pouring temperature was recommended to be near 1380℃ with the pouring rate of about 230㎏/sec. The 1:1:1 ratio of sprue, runner and gate and top pouring through 2 or 4 down sprues gave satisfied results of the castings. |