Application of dehumidifier in screen stretching p

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Application of dehumidifier in the stretching process of printing process

1. Whether the new and old frames are flat must be determined before use, because the uneven frame will seriously affect the stretching fastness. When the stress value required to break or deform the sample at a certain height, that is, the tightening strength value, the frame must be evenly and fully polished before use

2. The oil stain on the new frame must be removed, and the original glue on the old frame must be removed. At the same time, it is better to use it after cleaning

3. The best use temperature of viscose is 25 ℃, and the humidity is between 50% ~ 70%. If the temperature is low, the drying time will be prolonged accordingly, and if the humidity is low, the drying time will be shortened accordingly; When the humidity is 70%, the drying time shall be extended accordingly. If necessary, the dehumidifier shall be used to reduce the humidity

4. Special attention should be paid to the sudden cold weather, because the moisture in the air condenses on the frame surface. Although the humidity is not high at this time, it is better to dry the frame or use it after drying in the sun

5. In rainy days or spring, due to the relatively humid air, in addition to the normal treatment of the frame, special attention should be paid to the frame before the primer can be applied. When the glue is applied, a dehumidification device should be prepared or it is safe to irradiate with an infrared lamp and blow dry with a fan

6. The best oven temperature is 40 ~ 45 ℃. If it exceeds 50 ℃, the viscose begins to soften and easy to fall off

7. It's not easy to tear off the old and stretch again after gluing with universal glue. The residual universal glue on the frame is uneven, which affects the next stretch

it should be noted that many peers like to use cheap universal glue as viscose. Please use it with caution. Compared with viscose, all-purpose adhesive bandage has the following disadvantages:

① high surface viscosity and not easy to penetrate; ② Long drying time and low work efficiency; ③ The adhesive film is soft, and the initial viscosity and final tensile strength are not high; ④ Poor brushing performance and easy wire drawing; ⑤ Poor adhesion to the frame; ⑥ It is easy to fall off in rainy and humid days. These are all taboos of viscose, but "occupation" means "it's over if you don't work hard". The accurate degradation time control needs to be improved; There is no unified standard for the evaluation method of degradation performance, so it is better not to advocate the use

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