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山东印刷过程中墨杠造成的原因是什么?

  1. 随机的墨水

  1. Random ink

  现象:随机发生,无规则可循,有时轻有时重。

  Phenomenon: random occurrence, no rules to follow, sometimes light sometimes heavy.

  原因:油墨辊长时间和墨水,喷泉的解决方案和其他物质接触,摩擦力的作用下,墨辊表面性能下降,变得非常光滑,并逐渐老化,失去弹性,导致其转速和串墨辊,盘转速产生速度差,导致滑动摩擦,导致墨水。另外,如果胶印机振动异常也会产生不规则和较宽的油墨。

  Causes: ink roller contact with ink and fountain solution for a long time. Under the action of friction, the surface performance of ink roller decreases and becomes very smooth, and it gradually ages and loses elasticity, resulting in the speed difference between the speed of ink roller and the speed of disk, resulting in sliding friction and ink. In addition, if the offset machine vibration is abnormal, irregular and wide ink will be produced.

  排除方法:对墨辊进行全面检查。如果发现墨辊老化严重,有必要更换新的墨辊。反之,它可以用浮石粉、研磨机等适当地磨掉玻璃墨辊表面的皮,增加其摩擦。另外,还应做好胶印机的日常保养工作,定期检查关键紧固件的螺栓是否有松动和磨损的问题,一旦发现,必须立即进行修理。

  Exclusion method: conduct a comprehensive inspection on the ink roller. If it is found that the ink roller is seriously aged, it is necessary to replace it with a new one. On the contrary, it can use pumice powder, grinder and so on to properly grind off the skin on the surface of glass ink roller and increase its friction. In addition, we should also do a good job in the daily maintenance of the offset press, and regularly check whether the bolts of key fasteners are loose and worn. Once found, we must repair them immediately.

  2. 等间距的墨水

  2. Equidistant ink

  现象:印版分布宽度约为25px,颜色有暗墨和淡墨,油墨间距等于齿轮间距。

  Phenomenon: the plate distribution width is about 25px, the color has dark ink and light ink, the ink spacing is equal to the gear spacing.

QQ截图20170929174712.jpg

  原因:当滚筒式齿轮发生严重磨损时,齿轮侧隙会膨胀,齿轮啮合会不准确,滚筒式齿轮之间的接触会容易产生异常振动,导致滚筒式齿轮与表面的接触摩擦滑动,从而形成等间距的油墨。

  Cause: when the drum gear is seriously worn, the gear backlash will expand, the gear engagement will be inaccurate, and the contact between the drum gear will easily generate abnormal vibration, which will cause the contact friction and sliding between the drum gear and the surface, thus forming the ink with equal spacing.

  消除方法:(1)更换磨损严重的鼓形齿轮;(2)如果条件允许,可以适当减小滚子之间的距离,让齿轮啮合更加紧密,为了避免顶齿事故的发生,使齿轮侧间隙达到约0.1mm;(3)更换软衬,调整托辊之间的压力,采用微调,每次增加0.02mm,直到达到值。

  Elimination methods: (1) replace the drum gear with serious wear; (2) if conditions permit, the center distance between rollers can be appropriately reduced to make the gear mesh more closely. In order to avoid the occurrence of top gear accident, the gear side clearance can reach about 0.1mm; (3) replace the soft lining, adjust the pressure between rollers, use fine adjustment, increase 0.02mm each time until the optimal value is reached.

  3.浮动栏

  3. floating bar

  现象:浮墨,即油墨上有油墨颗粒和墨斑的地方。

  Phenomenon: floating ink, that is, there are ink particles and ink spots on the ink.

  原因:(1)清洁辊使用清洗剂与油墨混合,导致油墨变稀;(2)油墨辊筒老化;(3)使用质量不合格的油墨,这些油墨乳化、粘度等性能较差,在印刷过程中容易产生油墨。

  Reasons: (1) the cleaning roller uses cleaning agent and ink to mix, resulting in ink thinning; (2) ink roller aging; (3) using unqualified ink, these ink emulsification, viscosity and other poor performance, easy to produce ink in the printing process.

  排除方法:(1)更换油墨或在原用油墨中加入适量增稠剂,如印刷企业使用专色油墨,一般不易更换,此方法可采取添加增稠剂的方法。(2)若浮动油墨产生变色后,清洗水辊,则很可能是汽油或煤油残留与油墨混合,导致油墨粘结剂结构改变。为此,应重新清洗水辊,以保证其印刷前的清洁标准。(3)对于老化的墨辊应及时更换或进行研磨处理。(4)油墨乳化严重时,应重新清洗印版,开始印刷时应尽量减少纸张的水分。

  Exclusion methods: (1) change the ink or add a proper amount of thickener into the original ink. If the printing enterprise uses spot color ink, it is generally not easy to change. This method can adopt the method of adding thickener. (2) if the floating ink is discolored and the water roller is cleaned, it is likely that the residual gasoline or kerosene will mix with the ink, resulting in the change of ink binder structure. Therefore, the water roller should be cleaned again to ensure the cleaning standard before printing. (3) the aging ink roller shall be replaced or grinded in time. (4) when the ink emulsification is serious, the printing plate shall be cleaned again, and the water content of the paper shall be minimized at the beginning of printing.


 
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