Eight considerations for printing factory to do perfect binding:
1, observe proofs
1)
Printing random checks. When start book
printing, ink and water supply amount will be some changes, should frequent
random checks readjustment. At the same speed printing, ink and water supply
amount are in a stable state, per print 500 to 1000 carry out random checks.
2) Sandwiched
warning note. Formal printing, for local failure as a sign, a warning should be
sandwiched elongated strip to facilitate the inspection after the process.
2, Pay attention to water supply amount
1) Note
that the water supply amount on early printing. Be sure to observe the side
proofs whether the printing echoes, then adjust the water supply amount.
2)
Attention to the changes of water formal printing process. Pay close attention
to the machine body heat and ventilation in the workshop impact the water. Alcohol
Dampening to pay attention to the cooling device of dampening system.
3, Attention to changes in ink
1) attention
to fountain ink. Fountain ink outgoing from the ink fountain roller and the ink
fountain blade gap, the ink is extruded by weight. So, the number of fountain
ink amount directly affect the output amount of the ink.
So,
pay attention to make the fountain to maintain a certain amount of ink.
2) To
prevent the ink dried on the machine. Downtime such as eating, resting, the ink
fountain and rollers inks in the surface will be dry. Can Spray drying
inhibitors in the need to prevent dry place.
3)
Attention to the ink evenly. We should always be compared with the standard
sample checks, prevent uneven ink.
4) Maintain
the pH of the dampening water. When the ink added adjuvant, the pH value of the
dampening solution easily affect.
4, Attention to the back rub dirty
The
back rub dirty because ink dries slowly, graphic ink layer is too thick, paper
high smoothness and other reasons, the paper surface adhered to the back of a
printing paper phenomenon.
5, Pay attention printing echoes
failure
Printing
echoes is printing plate moved. The following method can check the cause and
treatment.
1) Printed
twice, observation overlay accuracy, check the machine and adjust it.
2) Check
the tension of the blanket. The new blanket easy to relax, watch several times
to tighten, but not too tight.
3) Check
cylinder packing and printing pressure.
4) Check
the paper adaptability. Defective paper adaptability prone to printing echoes,
so it should be checked.
5) Reduce
the viscosity of the ink. High viscosity of the ink, the paper can not be
successfully stripped the blanket, the paper end section unstable, resulting in
printing echoes.
6) Adjust
gripper. Gripper improper adjust and maintenance, is causing a major cause of printing
echoes.
6, Pay attention to check the situation
overprint
7, Attention to other work
1) Refilling,
mixing and wetting liquid supplement.
2)
Clear dirty job.
3) Clean
blankets, Wiping and gumming operations.
4)
Attention to presses anomalies.
8, Attention to confirm the number of
prints
When
printing ends, make sure that number of copies is consistent with the
production of construction orders.
