印刷胶辊的膨胀和收缩原因

胶辊的膨胀和收缩是良多印刷厂都面对的一个题目，对于印刷质量造成的影响也很大。膨胀和收缩产生的原因多种多样，但究其根源是因为橡胶和接触媒介之间的相互作用而产生的。

膨胀与收缩是胶辊的胶质与印刷机上媒介接触的化学反应。一方面：油墨中的物质会溶入胶质中。另一方面：胶质中的成分开释出到媒介中。总的来说，聚合物的抗溶剂性，在印刷中所用化学药品中，取决于墨辊的原料与媒介的化学极性。相同极性的物质互相溶解，显著不同极性的物质相互抵制。无极性的橡胶只含C，H和O微粒，当他们在相同无极性的油中则会膨胀，但在有极性的液体如酒精中则可以支持。橡胶辊厂分析导致墨辊收缩和膨胀的化学过程比较复杂，固然明确一点就是目前并无什么变形的测试在整个产业界可以认可，由于各种各样的因素，诸如：温度，时间等。

橡胶辊厂关于印刷化学药品与胶辊的膨胀实验只属于较简朴的，从长期的实验结果得出，影响的因素为：油墨组成成分，颜料，溶剂。印刷机中高速运转的墨辊，不单只传递墨和水，因为印版的吸墨量不同，所以墨辊要补偿这些墨源的几何误差。橡胶辊厂根据多年的经验会设计出精确的大小，位置和软硬度的印刷胶辊以适合印刷机高尺度的要求，因而加工这些胶辊时要用到非常精密的机器和长时间的处理过程。无论胶辊是膨胀或收缩对印刷过程都会造成很大的影响。

The expansion and contraction of rubber rollers is a problem faced by many printers, and the impact on printing quality is also great. There are many reasons for expansion and contraction, but the root cause is due to the interaction between the rubber and the contact medium.

Expansion and contraction are chemical reactions in which the glue of the rubber roller contacts the medium on the printing press. On the one hand: the substance in the ink dissolves into the gel. On the other hand: the components in the gum are released into the medium. In general, the solvent resistance of a polymer depends on the chemical polarity of the material and media of the ink roller in the chemicals used in printing. Substances of the same polarity dissolve each other, and substances of significantly different polarity resist each other. Non-polar rubber contains only C, H and O particles, which swell when they are in the same non-polar oil, but can be supported in polar liquids such as alcohol. The rubber roller factory analysis leads to a complicated chemical process that causes the ink roller to shrink and expand. Although it is clear that there is no deformation test at present, it can be recognized in the whole industry due to various factors such as temperature and time.

The rubber roller factory's expansion experiments on printing chemicals and rubber rollers are relatively simple. From the long-term experimental results, the factors affecting are: ink composition, pigments, and solvents. The ink roller running at high speed in the printing press not only transfers ink and water, but because the ink absorption of the printing plate is different, the ink roller compensates for the geometric error of these ink sources. Based on years of experience, the rubber roller factory will design precise size, position and hardness of the printing rubber roller to meet the high-scale requirements of the printing machine. Therefore, the processing of these rubber rollers requires very precise machines and long-term processing. process. Whether the rubber roller is expanded or shrunk has a great impact on the printing process.