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只看该作者 #10 | ||
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正式会员
等级: 三袋长老
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Why the press vendor need to provide the adjustment of this roller in width and position of the return match the plate cylinder position? In the old days, press operator would change the sweep width and position quite often. The function of the oscillator is to make the ink applied from the ink fountain to ink roller become more even. Each ink zone width (in Heidelberg press) is 32.5mm, the max. sweep width of the oscillator is 35mm. So we always find that the ink key position of an individual ink key would be affected by the ink key value next to it (having two ink key - left and right). Normally, if the job is having large ink coverage, then the sweep width would be set to max. width. For less ink coverage job, the sweep width would set to as small as possible. In some rare case, even turn off the oscillation. I did not know, nowadays, not many press operator would try to analyze the total ink coverage and adjust it accordingly. Normally the position of the return would be set at the nip area. However, why the design allow the adjustment there? The oscillator would travel in horizontal direction. One return trip is the same as the plate cylinder having two turns (printed two sheets). At the end of the each direction, the speed of the oscillator is ZERO. At this moment the effect on the ink evenness is the worst. The speed of the oscillator is keep on changing during the traveling. At the end of the journey, the speed is zero, then the speed would be increased when towards center, from the center to the other end, the speed would be decrease and reach zero at the other end. The effect of the ink evenness would be the best in certain part of the movement. Sometimes, press operator will change the position, the change would be according the content of the print job. For example, if a job having a important area at the certain area. The operator would change the position of the oscillator and place the most evenness ink area to that place to make the important part having the most evenness ink. |
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| 右列 2 位会员因为此帖价值甚高向 xxyyzz97 表示感谢: |
abear (2010-05-01),
Bloodsaler (2010-04-27)
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只看该作者 #13 | ||
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正式会员
等级: 三袋长老
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引用:
Originally I have a layout to show the describe the ink evenness distribution, but I cannot find it. The starting point of the oscillation, for example, in normal setting, the starting motion of the oscillator should at the nip area, because at this position, there is enough printed. Now the most important part of the job is very close to the gripper, in order to get the most even film at this part, then we need to adjust the starting position of oscillation, at this moment which will not start at the nip area. The modern press using the drive motor installed at the oscillator assy. Operator can change the position from the console. I believed that your KBA C215 should have this feature. You can adjust the starting position of oscillator at at place, there is no limitation or only set at a few places. |
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| 右列 2 位会员因为此帖价值甚高向 xxyyzz97 表示感谢: |
abear (2010-05-01),
Bloodsaler (2010-04-28)
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只看该作者 #14 | |||
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荣誉版主
等级: 七袋长老
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引用:
串墨辊的作用是什么? 为何印刷机需要提供校正该区域辊筒的摆幅与位置的功能来匹配印版滚筒? 曾经印刷机的操作员需要经常调整串墨辊的摆幅与位移。 串墨辊的作用就是使油墨从墨斗到墨辊上更为平整。在海德堡设备中,每一墨区的宽度是32.5mm,串墨辊的最大摆幅是35mm。因此我们发现一个墨区的墨键位置可能就会影响到相邻墨区的墨键值(左右墨键区) 一般来说,如果一个活件油墨覆盖面较广,这其串墨辊的摆动宽幅就可以设置为最大,对于墨区覆盖较窄印件,则串墨辊摆动宽幅越小越好。对于一些特定活件可能还要关闭串墨辊的运转。然而现在已经很少有印机操作员会根据整体油墨覆盖率来对应调整串墨辊的位置了。 通常串墨辊的回转方向被设置在印版滚筒的凹陷区域。为何会如此设计?传墨辊呈水平方向运转,一次转向过程中印版滚筒有两周运转。每次转向前,串墨辊的速度减为0;然后串墨辊方向以后速度又相对于中心速度增长。从一次转向到下一次转向,串墨辊速度又会持续递减为0.这样的运转过程中,在某一速度处,油墨的平整度会达到最佳。 有时印机操作人员也会改变串墨辊的位置。改变根据活件的具体内容而定。举例来说,如果某个活件在某一区域有一要求较重要的特定部分,操作员便会相应改变串墨辊位置来使该处的油墨碾平度最好。 News老大,翻译完了。不准确的你继续解释一下~ |
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| 右列会员因为此帖价值甚高向 Bloodsaler 表示感谢: |
abear (2010-05-01)
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只看该作者 #15 | |||
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荣誉版主
等级: 七袋长老
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引用:
我的意思是串墨辊从最左边运转到最右边,印版滚筒会转一转;然后串墨辊从左运转至右,印版滚筒又会转一转。因此对于串墨辊的整个循环过程,印版滚筒会转两圈。 我曾经有一张图表明了油墨在这一过程中的平整分配,但是我现在找不到那张图了。串墨辊的初始行程,举个例子,常规的设置来说,串墨辊的初始行程应该在咬口位,因为这一位置能被充分印刷到。现在该活件很重要的部分接近拖稍处,为了在该处得到最平整的墨层厚度,那么我们就需要调整串墨辊的初始位置,这样一来串墨辊就不会在咬口位起始运转。 现代印刷机在串墨辊处安装了独立的电机。操作员能在操作界面中就能调整其位置。我相信KBAC215也有该功能。 你可以改变串墨辊的起始位置在任何地方,并没有什么特定的限制。
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| 右列会员因为此帖价值甚高向 Bloodsaler 表示感谢: |
sudong123 (2010-04-29)
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