Common faults and troubleshooting of the hottest w

Common faults and troubleshooting of water-based calendering (Part 2)

IV. wrinkle and discount of printed matter (1) fault reasons

① excessive or uneven humidity of paper

② excessive or uneven pressure

③ rubber roll deformation and aging

(2) troubleshooting

① check and adjust the pressure to make it uniform

② reduce pressure and appropriately increase temperature

③ pay attention to the humidity of the paper, make it uniform and consistent, and coordinate with the workshop operating environment:

④ pay attention to the aging and deformation of the rubber roller, and regrind and grind it if necessary

v. adhesion and peeling difficulties in calendering process

(1) fault cause

① calendering temperature is high

② the varnish is not fully dried, and there is too much residual solvent

③ the calendering oil coating is thin

④ the calendering pressure is too high

⑤ the lotion in the varnish dries too slowly

⑥ the surface of the light band is not clean or there are resin deposits

⑦ the original calendering oil is oil soluble or alcohol soluble

(2) troubleshooting

① the coating must be fully dry before calendering

② reduce the calendering temperature appropriately

③ increase the coating thickness of calendering resin

④ reduce the calendering pressure

⑤ change the type of lotion and increase the amount of release agent

⑥ it is best to polish the light band once

⑦ thoroughly clean the calendering belt with cleaning solution

VI. there are streaks, orange peel, flowers and other phenomena on the calendering film surface

(1) fault causes

① the calendering resin (polishing oil) has high viscosity and thick coating

② the leveling property of calender after polishing is poor and the coating is uneven

③ the printing ink does not dry, and water and oil repel with the polishing oil

④ there is much dust on the surface of printed matter

⑤ the ink on the surface of the printed matter crystallizes and the coating is scratchy

⑥ the calendering temperature is too low to soften the resin

⑦ calendering this experimental machine can measure the fatigue value of the specimen, and the force is too small

(2) troubleshooting

① the printing ink must be fully dry before calendering

② in case of ink crystallization and other faults, the primer must be applied first:

2. Curve traversal: the force value and deformation data of the experimental curve can be checked point by point ③ appropriately reduce the resin viscosity and improve the leveling

④ appropriately increase the calendering temperature and pressure

VII. The brightness on both sides of the calendering film surface is different

(1) fault reason

① the coating thickness on both sides of the calendering coating is inconsistent

② the pressure on both sides of the light band is not equal

③ the thickness of the rubber roll is inconsistent between the middle and both sides due to the long-term compression of the product

④ the wear or cleanliness of both sides of the light band is not

(2) troubleshooting

① pay attention to the uniformity of resin coating; Through the connecting plate and the upper square iron, the main shaft drives the pendulum rod and pendulum to produce an angular displacement

② adjust the pressure on both sides of the light band to make it even

③ keep the light band surface clean

④ pay attention to the deformation and adjustment of the rubber roller

source: China ink technology

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