Influence of Various Properties of Blanket on Print Quality

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Thickness is expressed and measured, and the indicated thickness is called “nominal thickness”. This representation method is based on ISO specifications. The actual thickness is provided by the blanket manufacturer according to the printing press and practical conditions, so this thickness is not limited to the same as the actual thickness. For this reason, the blanket manufacturer will attach a check list with the actual thickness measured at the time of shipment of each blanket, or print the values ​​on the back of the blanket.

Hardness generally refers to the surface hardness of the blanket, that is, the overall hardness value of the rubber surface, the base fabric layer, and the compression layer. It is expressed by the Shore hardness value and used as an indicator of the compression performance of the blanket.

Resilience is expressed in %, and a certain weight of cone is dropped on the rubber surface of the blanket to measure its rebound force. This value can be considered as the absorptivity of the blanket. This is closely related to the quality of the surface rubber and the quality of the cushion layer, and has a great influence on the quality of the air-cushion blanket and the printed products.

The elongation rate is expressed in %. A certain load is reinforced in the longitudinal direction of the test piece of the specified size, and the elongation rate obtained by the calculation formula after a certain time is measured. This value is closely related to the base fabric structure of the blanket, which affects the installation of the blanket, the number of tightenings in the printing process, and the thickness variation of the rubber nose.

Tensile strength is expressed in %, a certain load is fixed in the longitudinal direction of the test article of a predetermined size, and is performed at a constant tensile speed, and the elongation at break of the test article is measured.

The bond strength between the layers is expressed in N/mm and the bond strength of each layer of the test article in a predetermined size. This value affects the stability of the quality of printed products. It is an important indicator for the surface rubber layer, the top layer fabric and the air cushion layer at high speed.

In addition, the solvent resistance is expressed in terms of the thickness change mm, and the ink resistance is expressed in terms of the thickness change mm, and each manufacturer has a specified number of values ​​to control.

In terms of dynamic properties, there are sags in mm. Percent changes in circumference are expressed in %. Each manufacturer also has a specified quantity to control.

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