Fig. 1 Green glass in blank mold.

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1 On the Thickness of Inter Layer between Glass andmold (Some Comments in Regard to Trier's Experiment) By Hiromu KISIGAMI (Toyo Glass Co., Ltd. 2-3, 3 Chome, Yako, Kawasaki shi, Kanagawa) In the process of glass formation by the automated machine manufacturing, the presence of temperature of glass, especially in the peripheral areas surrounding the inner surface of mold does hold a serious bearing as the deciding factor for success or failure in securing the desired quality product. Particularly does such temperature find itself heavily swayed by the extent of the magnitude of the layer's thickness lying inbetween the mold and glass. By means of utilizing the analogue computer, the research experiment had been conducted by E. Deeg on the movement of heat at the time of glass formation within such mold-glass interface. It was claimed by M. Coenen through his experiment that such layer's presence can be entirely ignored from being taken into any account whatever. Using the special method which is to be the measurment of the glass viscosity, W. Trier estimated the temperature distribution of glass in the blank mold as well as the thickness of layer. Following after his experiment, this report is made as to the presenta tion of the theoretical analysis that was conducted by the author. Such a thermal property as thermal conductivity, specific heat and specific weight of glass, together with the heat transfer and heat radiation of very thin zone between glass and mold were treated as the function of temperature. In this manner, because it is extremely difficult under the transint states, to obtain some tangible solution in a strick sense for the non-lineal, the digital computer was utilized in arriving at the numerical solution. Thus, by this means of approaching upon the procedural, bases on the comparisions, it was found from the evaluation actually computed as against those of the experimental data, it has thereby been enabled to clarify many aspects which had been left undisclosed up till now dealing with the problems of interface layer and the mechanism of the heat flow within the peripheral layer in between the area of mold-glass interface. [Received Feb. 24, 1969]

2 Fig. 1 Green glass in blank mold.

3 Table 1 Composition of green glass. Fig. 2 Thermal conductivity of green glass at various temperature. Fig. 3 Resultant relationship obtained between the gap clearance and ƒð where the mold is held at a constant maximum temperature of 470 Ž.

4 Fig, 4 Temperature distributions of green glass in the case where the maximum mold temperature is 470 Ž with filled gob. Fig. 6 Resultant relationship obtained between the gap clearance and ƒð where the mold's initial temperature is 400 Ž. Fig. 5 Time variations resulted from temper ature differences on the surfaces of glass-mold and thermal flux. Fig. 7 Temperature distribution of green glass in the case where the initial temperature of blank mold is 400 Ž.

5 Fig. 8 Surface heat radiation of transparent body having inner radiation.

6 œ : Surface temperature of glass : Surface temperature of blank mold Fig. 10 Surface temperatures of green glass and blank mold at various clearansce. (2.9 sec after gob is filled.) It is initial temperature of blank mold. Fig. 9 Viscosity of green glass at various temperatures; compositions given in Table 1.

7 1) E. Deeg, Glastechn. Ber, 32 [10] (1959). 2) M. Coenen, Advan. Glass Techno. July 8-14, (1962). 3) W. Trier, Glastechn. Ber. 33 [12] (1960) ; J. Am. Ceram. Soc. 44, , (1961). 4) D.E. Sharp and LB. Ginther, J. Am. Ceram. Soc. 34, 260 (1951). 5) W.L. Baillie., J. Soc. Chem. Ind. 40, 141 (1921). 7) F.V. Tooley, Handbook Glass Manu., 24 (1953) 8) A. Russ, Sprechsaal 15, 907 (1928). 9) L. Genzel, Glastechn. Ber. 26 [3] (1953). 10) I. Huhmann, Glastechn. Ber. 32 [5] (1959). 11) N. Neuroth, Glastechn. Ber. 32 [5] (1959). 12) W. Giegerich, Glastechn. Ber. 26 [11] (1953). 13) M.V. Okhotion, Steklo i Keramika, 11 [1] 7 (1954) Glass Ind. 38, 270 (1937).

Rate of Oxidation of Liquid Iron by Pure Oxygen Shiro BAN-YA and Jae-Dong SHIM Synopsis: The rate of oxidation of liquid iron by oxygen gas has been s

Rate of Oxidation of Liquid Iron by Pure Oxygen Shiro BAN-YA and Jae-Dong SHIM Synopsis: The rate of oxidation of liquid iron by oxygen gas has been studied using a volume constant technique. The process