Warp Offset and Processing of Web Offset (1)

Rotary offset press folding fault analysis and processing As we all know, wheel offset press is provided by the paper, printing, folding three parts, which folding machine folding press folding and impact folding two.
The following is an analysis of the failure phenomenon and its causes in the folding process of the general rotary glue machine and proposes the corresponding treatment method.
First, when the tape is folded vertically, two unevennesses or running on the triangle board is unstable:
1. The web is not positioned correctly in the axial direction;
2. The pressure of the paper pressing wheel on the paper belt driving roller is not uniform;
3, parsing roller set too loose;
4, the triangle plate and the belt drive roller equal level, skew.
deal with:
1. Set the axial position of the web correctly;
2, adjust the pressure of each pressure roller to make it uniform;
3, re-set folding folder roll gap;
4. Adjust the triangle so that it is parallel to the tape drive roller.
Note: Since the printer has been set up after the printer has been set up, it is rarely necessary to make adjustments. Therefore, be sure to check and queue other possible problems before re-adjusting the triangle.
Second, wrinkles appear at the longitudinal creases or wrinkles along the longitudinal folds Causes:
1, the folding roller set too loose;
2. Excessive paper feeding (The cause may be due to excessive ink or other related factors causing the rubber roll to become sticky);
3, folding triangle angle to set too large;
4. The triangle plate and the tape drive roller are not parallel and skew.
deal with:
1, re-set folding folder roll gap;
2, reduce the amount of ink scrubbing roller;
3. Re-set the angle of the folding triangle;
4. Adjust the triangle so that it is parallel to the tape drive roller.
Third, the triangular plate at the tip of the crack or crack occurs:
1. The guide roller and folding roller are too tight;
2. The angle of the folding triangle is too small.
deal with:
1. Re-set the gap between the guide roller and folding roller.
2. Re-set the angle of the folding triangle.
Fourth, the slitting of the edge of the paper or lack of slitting phenomenon causes:
1、Shoring paper-cutting film (round knife) Passivation or broken mouth;
2. The circular blade is not correctly set in the drive roller slot.
deal with:
1, replace the slitting paper blade (ie, round blade);
2. Set the position of the circular blade in the notch of the drive roller.
V. Cross-cutting position is not correct. The position of the header is unsatisfactory or half finished. Reasons:
1. Adjustment roller (paper roller) is not adjusted;
2, the paper line error.
deal with:
1, adjust the roller, change the root of the folding position;
2, change the paper path.
6, excessive tearing of the needle - book pin hole eye pull reasons:
1, passivation, bending or breaking of the pin on the roller;
2. The cam setting of the control needle is not correct;
3, folding folder roll set too loose;
4. The cam setting to control the movable tooth decay is incorrect;
5. The correct setting of a tooth corresponding to the parser.
deal with:
1, repair or replace the roller pin;
2. Reset the cam position of the control needle;
3, re-set folding folder roll gap;
4, reset the position of the movable tooth decay cam;
5, re-set the relative position of folding knife and tooth decay. (To be continued)