| 摘要 |
PURPOSE:To manufacture an ultrafine roller having a relatively uniform length with high productivity without dusting, by giving a sudden temperature change to crush conjugate glass fibers consisting of plural kinds of glass of cross section having different thermal expansion coefficients. CONSTITUTION:Glass having a low thermal expansion coefficient is placed in the inside of a crusible 1 of double structure, and glass having a high thermal expansion coefficient is placed on the outside thereof. Both are melted under heating in an electric furnace 2, and drawn to give a conjugate glass fiber 3 of cross section consisting of a glass part (3a) having the low thermal expansion coefficient and a glass part (3b) having the high thermal expansion coefficient. The resultant conjugate glass fiber 3 is then wound onto a capstan 4 in a thermostatic chamber 5 kept at the strain point of the above-mentioned glass. A sudden temperature change is given to the above-mentioned conjugate glass fiber 3 by adjusting the temperature thereof to ordinary temperature or above and dipping the glass fiber 3 in a cryogenic liquid to give the aimed ultrafine roller having abot 2-12mu diameter and a length about 3-20 times that of the diameter.
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