Abstract Flexographic sleeves are made using various materials, including a sub-group with extremely durable polyurethane foam shock-absorbing layer. During exploitation, the sleeves are exposed to cyclic dynamic loading, and the flexographic printing process is highly sensitive to the changes in pressure. Deformation of printing elements occurs due to the almost two times higher residual strain of the exploited sleeves. Changes in the residual strain induce occurrence of the hysteresis losses, which lead to heat generation. The forces impacting the material are not strong enough to induce permanent deformation in the microstructure. Therefore, the leading cause of the change lies in the molecular structure of the parent polymer of the polyurethane foam cell walls, whose resilience is declining. The thickness of the exploited sleeves tends to be around 8 % lesser. In addition to high-frequency cyclic loads during printing, the adhesive layer of self-adhesive sleeves undergoes reduction in the share of acrylates, phthalates and rosin, thereby reducing the adhesive strength and the force needed to initiate the de-adhesion by half. The knowledge of mechanisms of change in certain characteristics of the sleeves enables predicting their service life and increasing the stability of the printing process through possible corrections of other process parameters.

中文翻译：

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开发对可压缩聚氨酯柔版套筒性能的影响

摘要 柔印套筒使用各种材料制成，包括具有极其耐用的聚氨酯泡沫减震层的子组。在开发过程中，套筒受到循环动态载荷，柔版印刷过程对压力变化高度敏感。由于使用过的套筒的残余应变几乎高出两倍，因此会发生打印元件的变形。残余应变的变化会引起滞后损失的发生，从而导致发热。冲击材料的力不足以在微观结构中引起永久变形。因此，变化的主要原因在于聚氨酯泡沫细胞壁母体聚合物的分子结构，其回弹性下降。被利用的袖子的厚度往往要小 8% 左右。除了印刷过程中的高频循环载荷外，自粘套筒的粘合层中丙烯酸酯、邻苯二甲酸酯和松香的份额减少，从而使粘合强度和启动脱粘所需的力降低了一半。了解套筒某些特性的变化机制可以预测其使用寿命并通过可能的其他工艺参数修正来提高印刷工艺的稳定性。