Talk about how to solve the problem of the stretch of nylon silk screen in the production process

There are many factors that cause the flexing of the printing plate, but there are mainly four kinds: the influence of the temperature, the influence of the printing plate and the vacuum pumping, the insufficient drying, the insufficient screen tension, and the debonding of the screen.

1. Effect of temperature

The influence of temperature on the screen is very obvious. We can confirm this problem in the following experiments, that is, the same tension, the same drying temperature, the same exposure time, with different cooling time for testing.

First, the five screens were coated and the thickness was changed. After completely drying at a temperature of 45°C, the first precoating plate was immediately cooled without cooling, and the other four plates were placed in a dark room at 15°C. After 30 minutes, 30 minutes, 60 minutes, and 120 minutes of cooling, respectively, printing and drying were performed, and the degree of flexing of the plates was found to be significantly different (see table). From the table, it can be seen that they are very flexible. The first four pieces can be clearly seen with the naked eye, and the last piece, whose cooling time is 120 minutes, cannot be clearly seen with the naked eye. Therefore, sufficient cooling time must be passed before the printing plate is dried.

Normal align=center> Cooling time

Normal align=center> ( mm)

Normal align=center> Shrinkage

Normal align=center> (%)

Normal align=center> Shrink length

Normal align=center> ( mm)

Normal align=center> Strain

Normal align=center> ( Mpa)

Normal align=center> 0

Normal align=center> 0.5

Normal align=center> 40

Normal align=center> 0.65

Normal align=center> 10

Normal align=center> 0.25


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