First, the paper is seriously deformed, surrounded by lotus leaf, undulating, this kind of paper mouth is uneven, and after pressure rolling, it is prone to wrinkles. In this case, folds generally appear on the sides and corners, and the pleats are relatively large, the paper is turned over, the head is turned, and the adjustment mechanism does not change much.
Second, the oscillating tooth and the impression cylinder have a small open angle, which causes the gripper to play paper, which causes the uneven mouth or the amount of paper to be reduced, thus causing wrinkles in the printing. The pleats appear to be larger and longer in this case, generally from the mouth to the tip. If the situation is serious, there will be a sticky skin or paper loss.
Third, the imprinting cylinder grippers lack of strength, wear pads, tooth wear, dental prosthesis, etc. will make grippers in the printing process can not hold the paper, resulting in paper micro-displacement, the surface is not smooth, and there Folds. The pleats in this case are generally small and fixed in position. Coated paper is prone to horseshoe folds or misprints.
Fourth, the transfer roller, the collection of paper chain rod tooth pads, tooth wear, lack of paper force will also cause the paper to pleat.
How do the transfer roller and the delivery chain link correlate with the wrinkling of the paper? Let's take a look at the cross-sections of the following four sets of paper, the transfer roller and the delivery chain link.
From the above four sets of figures, we can see that when the transfer cylinder or delivery chain lever is connected to the paper, there is still a part of the paper that does not pass the nip between the blanket cylinder and the impression cylinder, that is, the transfer cylinder or After the delivery chain levers hold the paper, the paper is also under pressure from the blanket cylinder. Therefore, the pad and the tooth chip of the transfer roller or the delivery chain bar are worn out, and the lack of pressure will also cause wrinkles to appear.
The folds in this case only appear when printing large-format paper, and the position is fixed. If the maximum size of the press is 780'540, the wrinkles will appear in the position marked in FIG. For example, if the maximum width of the press is 540'390, wrinkles appear in the position marked in FIG.
In addition, the ink is too viscous, the pressure is too large, the amount of paper roll is not uniform (large and small), and the common paper pick-up time is not appropriate, so that the printed product will wrinkle.
These are my own experiences in practice - I hope to give you some inspiration.
Second, the oscillating tooth and the impression cylinder have a small open angle, which causes the gripper to play paper, which causes the uneven mouth or the amount of paper to be reduced, thus causing wrinkles in the printing. The pleats appear to be larger and longer in this case, generally from the mouth to the tip. If the situation is serious, there will be a sticky skin or paper loss.
Third, the imprinting cylinder grippers lack of strength, wear pads, tooth wear, dental prosthesis, etc. will make grippers in the printing process can not hold the paper, resulting in paper micro-displacement, the surface is not smooth, and there Folds. The pleats in this case are generally small and fixed in position. Coated paper is prone to horseshoe folds or misprints.
Fourth, the transfer roller, the collection of paper chain rod tooth pads, tooth wear, lack of paper force will also cause the paper to pleat.
How do the transfer roller and the delivery chain link correlate with the wrinkling of the paper? Let's take a look at the cross-sections of the following four sets of paper, the transfer roller and the delivery chain link.
From the above four sets of figures, we can see that when the transfer cylinder or delivery chain lever is connected to the paper, there is still a part of the paper that does not pass the nip between the blanket cylinder and the impression cylinder, that is, the transfer cylinder or After the delivery chain levers hold the paper, the paper is also under pressure from the blanket cylinder. Therefore, the pad and the tooth chip of the transfer roller or the delivery chain bar are worn out, and the lack of pressure will also cause wrinkles to appear.
The folds in this case only appear when printing large-format paper, and the position is fixed. If the maximum size of the press is 780'540, the wrinkles will appear in the position marked in FIG. For example, if the maximum width of the press is 540'390, wrinkles appear in the position marked in FIG.
In addition, the ink is too viscous, the pressure is too large, the amount of paper roll is not uniform (large and small), and the common paper pick-up time is not appropriate, so that the printed product will wrinkle.
These are my own experiences in practice - I hope to give you some inspiration.