印刷制版用N_2等离子体蓝紫光源的实验研究

我国的印刷制版行业目前正处于从传统PS版向计算机直接制版(Computertoplate)技术转变的进程之中,PS版的产销量十分可观,在CTP技术中继续使用传统的PS版对我国印刷包装行业意义重大。实现传统PS版的CTP技术关键在于解决曝光光源问题。本文采用连续直流源空心阴极放电方式产生氮气等离子体蓝紫光源,成功地对一种超感度重氮萘醌系PS版进行曝光,从注入功率、放电气压等方面探讨了氮气等离子光源的最佳工作条件,在工作气压70Pa、放电电压580V、电流1.8A下获得了0.46mW/cm2的蓝紫光输出。气体放电光源还可轻易实现高频大功率脉冲输出,本研究结果表明,新型空心阴极氮气等离子体光源在实现PS版CTP技术方面具有一定的发展前景。

The Experimental Study of the Novel N2 Plasma Light Source for Plate Making in Printing Industry

Our printing and packaging industry is experiencing a rapid transfor mation from conventional pre-sensitivity(PS)plate to computer to plate(CTP)technology,the amount of PS plate is rather huge,it is very important to use t he conventional PS plate in CTP tech.The first difficulty we face is how to get an exposure light source for PS-CTP.In this paper,a blue-purple N2 plasma l ight source generated in direct current hollow cathode discharge(HCD)is invest igated.By using it a super sensitive diazo-salt PS plate is well photosensitiz ed.The properties of N2 plasma light source are studied from the injection powe r and gas pressure.With the applied voltage 580V,current 1.8A and working pres sure 70Pa an optical power density of 0.46mW/cm2 is obtained.Another advantage of gas discharge is that,it can be easily operated by the high frequency and hi gh power pulse activation.Our results show that,this novel hollow cathode disc harge plasma light source may bring a new method in CTP technology based on the conventional PS plate.