简便快捷的地质图电分制版工艺

由于计算机和激光技术的迅猛发展,世界印刷工业已进入全面应用电子计算机的新阶段,地质图件的出版发行也随之受到冲击。一方面,电分机、桌面出版系统、多媒体技术等各种新技术在印刷领域广为采用,使得大量印品日臻完美。另一方面,与绝大多数的图件复制一样,我国目前的地质图复制基本还停留在人工翻版。

从印刷工艺角度看前端挂网的重要性

前端控网是相对于后端挂网来说的。传统的电分工艺,可以对各个图片分开扫描、分色、制得四张分色片,然后经手工拼版拷贝,组成一张整页版面;因此,可以实现在同一版面内对不同图片使用变化的挂网参数。这几年,随着桌面系统的快速发展,电子整页拼版早已实现,排版后的结果经照排时统一挂网发出四张分色片。

Vacuum pyrolysis of waste print circuit board

Waste print circuit board containing 11.38% Br was pyrolyzed in vacuum. Thermal stability of waste print circuit board was studied under vacuum condition by thermo-gravimetry(TG). Vacuum pyrolysis of WPCB was studied emphasizing on the kinetics of WPCB pyrolysis reactions. Based on the TG results, a kinetic model was pro- posed. Kinetic parameters were calculated for reaction with this model including all stages of decomposition. The average activation energy is 68 kJ/mol with reaction order 3. These findings provide new insights into the WPCB thermal decomposition and useful data for rational design and operation of pyrolysis.