手工烫金,谁知道用什么胶水粘电化铝箔。在红纸上手工烫金。
有经验者,能具体叙述一下。急、特急…
推荐回答(1个)
烫金机、烫金板、烫金纸及被烫物体准备好以后即可进行烫金。烫金工艺除去烫金纸选用正确外,最主要的是温度、压力、时间的掌握,这三点是烫金加工的主要参数。
(1)烫印压力:烫印压力的大小应根据被烫物性质、厚度及烫印形式决定。其压力之大以不糊版,烫印清晰光亮为度;其压力之小以牢固不脱落、不发花为宜。如果在同一块版上,烫印两种面积大小悬殊的图文时,要掌握好单位面积压力的相等,烫印面积越大,烫印压力应越大,反之则小。在整个烫印过程中存在着三个方面的力:一是电化铝从PET基膜上剥离下来时产生的剥离力;二是电化铝与承印物之间粘结在一起的粘结力;三是承印物表面的固着力。因此,烫印时所需的烫印压力要比一般印刷的压力大:大约为4kg/cm2对烫印压力有影响的因素主要有:烫印温度、机器速度、电化铝本身的性质和被烫印物表面的情况。所以,在设定和调整烫印压力时要对上述因素进行综合考虑。一般来说,在烫印温度低、烫印速度快、被烫印物表面平滑度低的情况下,要增加烫印压力,反之则减少。
烫印机压力的调整方法有两种:一种是自动的;一种是手动的,自动的可根据被烫物厚度、性质进行调整。手动的主要掌握接触被烫物以后的压力。这在操作中是十分重要的。自动烫金机调整烫印压力,是受数据控制的,比较方便,但遇到被烫物厚度不等时,会出现质量问题;而手动虽笨重,但压力可以自由掌握,不受被烫物厚与薄的影响。
(2)烫印温度。烫印温度是根据被烫物的质地与烫印形式以及烫金纸的性质等决定的。烫印温度过高,则会出现糊版、图文不清晰等弊病,反之则会出现烫印不上、烫后脱、无光泽、发花等弊病。
确定最佳烫印温度所应考虑的因素是:烫金纸(电化铝)的型号及性能、烫印压力、烫印速度、烫印面积、烫印图文的结构以及烫印车间的环境。当烫印压力较小,机器速度快、车间环境差的情况下,烫印温度要适当提高。烫印温度的适当范围为80—200℃。当最佳温度确定以后,应能够自始自终保持恒定,温度差尽量不要超过±2℃,以保证一批产品的质量稳定。
(3)烫印时间。烫印时间是电化铝与承印物的接触时间,接触时间与烫印牢度在一定条件下是成正比的,烫印速度稍微慢一点,可使电化铝与承印物粘结牢固,有利于烫印,当机速增大,烫印速度太快,电化铝的热熔性膜和脱落层在瞬间尚未熔化或熔化不充分,就导致烫印不上或印迹发花。烫印时间必须与压力、温度相适应,过快、过慢都有弊病。
在实际操作中,烫金人员通常把烫印时间作为一个常量不轻易改变它。固定了烫印时间后,去调整烫印温度与压力会使变量减少、操作简化、容易控制质量。一般来说,只有在条件特殊时才考虑改变烫印时间。
总之,上述三个工艺参数确定的一般顺序:以被烫物的特性和电化铝的适性为基础,以印版面积和烫印时间来确定温度和压力,温度和压力两者首先要确定最佳压力,使版面压力适中、平整、各处均匀,在此基础上最后确定最佳温度。
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