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    • 6. 发明申请
    • PROCESS AND APPARATUS FOR MAKING GLASS BEADS
    • 制造玻璃珠的工艺和装置
    • WO00020345A1
    • 2000-04-13
    • PCT/US1999/023241
    • 1999-10-06
    • E01F9/04C03B19/10C03C3/078C03C3/087C03C3/089C03C3/091C03C12/00C03C12/02E01F9/015
    • C03B19/1015C03B19/102C03B19/109C03C3/078C03C12/00
    • A method and apparatus for preparing glass beads utilizes an equation solving for the relaxation time of molten glass filaments, which is the elapsed time from when a molten stream breaks up as a result of force imparted on the stream until reaching the relaxation point, at which a maximum percentage of filaments have formed round beads. The equation for relaxation time is tau =(d• mu )/ sigma , wherein tau is the relaxation time; d is the diameter of the formed round beads; mu is the viscosity of the filaments during the relaxation time; and sigma is the surface tension of the filaments during the relaxation time. The system for preparing glass beads is configured based on this equation by selecting certain parameters such that the relaxation point is achieved just when the round beads are exiting a heated region of the system and entering a cooling region, for example, the atmosphere. These parameters include the degree of heat applied both to melt the glass raw materials and to sustain the heated region, the length of the heated region, the force applied to the stream, and the composition of the molten glass. Typically, when designing a new system, all other parameters except for the length of the heated region are fixed, and the length is determined from the above equation. On the other hand, after a system is in place, the length of the heated region is usually fixed, and the force applied to the stream is determined based on the other parameters. In this way, a relatively high fraction of round beads are formed, even when relatively small beads are desired.
    • 用于制备玻璃珠的方法和装置利用解决熔融玻璃丝的弛豫时间的方程,这是由于在流上施加的力直到达到松弛点而从熔融流分解出来的时间,其中 长丝的最大百分比形成圆珠。 弛豫时间的方程为τ=(d·μ)/ sigma,其中τ是弛豫时间; d是形成的圆珠的直径; mu是松弛时间的丝的粘度; sigma是松弛时间的长丝的表面张力。 用于制备玻璃珠的系统通过选择某些参数来配置,使得仅当圆珠离开系统的加热区域并进入冷却区域(例如大气)时才实现松弛点。 这些参数包括为了熔化玻璃原料和维持加热区域,加热区域的长度,施加到流的力和熔融玻璃的组成而施加的热的程度。 通常,在设计新系统时,除了加热区域的长度之外的所有其它参数是固定的,并且根据上述等式确定长度。 另一方面,在系统就位之后,加热区域的长度通常是固定的,并且基于其他参数确定施加到流的力。 以这种方式,即使当需要相对小的珠子时,也形成相当高的圆珠粒。