The blanket must be fastened to the cot under appropriate tension. If the blanket tension is too loose and the blanket cannot be reset in time due to displacement under the action of extrusion force during blanket embossing, it will lead to ghosting failure. If the blanket is too tight, it will bring many disadvantages

1胶层较薄，弹性较低。如果印刷压力是通过在橡皮布的自场状态下测量千分尺的厚度来计算的，则胶层的过度变薄可能导致印刷压力不足。由于帘布层变薄，毯子的弹性降低了。即使在减小中心距离和增加压缩的情况下，也可能发生油墨转移不良。如果气垫毯过紧，可能使微泡海绵层失效，失去气垫毯的良好性能。

1. The adhesive layer is thin and has low elasticity. If the printing pressure is calculated by measuring the thickness of the micrometer in the self field state of the blanket, the excessive thinning of the adhesive layer may lead to insufficient printing pressure. As the ply becomes thinner, the elasticity of the blanket decreases. Even when the center distance is reduced and the compression is increased, poor ink transfer may occur. If the air cushion blanket is too tight, the microbubble sponge layer may fail and lose the good performance of the air cushion blanket.

2印刷压力不均匀。由于张力的作用，毛毯在圆周方向上不同位置上的张力不均匀，造成毛毯在圆周方向上的减薄不均匀，造成印刷压力不均匀。张力越紧，不均匀性越严重。压力的不均匀性导致油墨转移的不均匀性，使本应均匀的场或平板背景色变得不均匀，使彩像的色调发生偏移。

2. Uneven printing pressure. Due to the effect of tension, the tension of the blanket at different positions in the circumferential direction is uneven, resulting in uneven thinning of the blanket in the circumferential direction and uneven printing pressure. The tighter the tension, the more serious the non-uniformity. The non-uniformity of pressure leads to the non-uniformity of ink transfer, which changes the color of the field or flat background that should be uniform, and shifts the tone of the color image.

3影响同步滚动状态。在正常橡皮布张力和胶筒内衬厚度的情况下，三个辊子具有良好的同步轧制区，因此在张力过大的情况下，胶筒与板筒、压印筒的同步轧制比会上升，破坏同步轧制状态，三个辊子会滑动，这会影响网点的正确转移，破坏原稿的层次和色彩。

3 affect the synchronous rolling state. Under the condition of normal blanket tension and rubber cylinder lining thickness, the three rollers have a good synchronous rolling area. Therefore, under the condition of excessive tension, the synchronous rolling ratio of rubber cylinder, plate cylinder and embossing cylinder will rise, destroy the synchronous rolling state, and the three rollers will slide, which will affect the correct transfer of dot and destroy the level and color of the original.

4加速橡胶毯的蠕变和老化。张力越紧，越容易引起橡胶分子的构象变化，分子链越硬，橡胶的弹性越差，影响产品的印刷质量，缩短橡皮布的使用寿命。

4 accelerate the creep and aging of rubber blanket. The tighter the tension, the easier it is to cause the conformational change of rubber molecules. The harder the molecular chain, the worse the elasticity of rubber, which affects the printing quality of products and shortens the service life of rubber blanket.