Several reasons for wrinkled paper caused by web printing

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In web printing , paper wrinkling is a very common problem, which not only affects the overprinting accuracy of multi-color printing, but also brings serious quality problems to the product itself, because the wrinkled portion of the paper passes through When the paper is passed through the paper roll, it will inevitably produce smudging, which will affect the quality of the printed product, and even cause the paper tape to break under severe wrinkles. For the diary printing of the high quality requirements I am currently engaged in, the crumpled paper problem under any circumstances cannot be tolerated. Moreover, compared with the characteristics that the paper printing and folding methods used in newspaper printing are relatively fixed, the diary printing is quantitative or paper-based, depending on the demand of the order, and the folding method often changes, so the machine The adjustment is more complicated, and wrinkled paper becomes a more prominent problem.

In addition to the above-mentioned "size and size" caused by uneven water absorption of the paper, the following various conditions can also cause wrinkle paper failure: 1 the entire paper roll width, winding hardness and paper thickness are uneven during the production process; The tension of a section of paper tape is too small; 3 the crumpled paper caused by the paper holder; 4 The pressure of the blanket cylinder of the printing unit is improperly adjusted; 5 The adjustment of the paper roller and the paper feed roller is incorrect (there is no horizontal or uneven pressure between the two sides) 6; paper powder and ink are accumulated on the paper guide roller; the angle of the triangle of the folding machine is improperly adjusted; 8 the printing unit of the printing machine, the upper structure of the folding machine, the paper pulling device and the folding mechanism are not properly matched with each other.

These are the reasons why the paper is easy to cause wrinkles in the production process. The previous points are easier to exclude because the factors causing the wrinkles are single. The last point is relatively complicated and needs to be analyzed according to the specific conditions at the time of production. When printing a diary, it is often necessary to switch to different paper feeding methods, folding methods and paper. Especially when the paper quality and quantitative change of the paper used are large, each time it needs to be adjusted according to different situations. Otherwise, it is easy to wrinkle the paper at the folding machine triangle. Therefore, from the platen roller, the paper-feeding roller of the upper structure of the folding machine, to the triangular plate of the folding machine, and to the sets of parallel rollers under the tip of the triangular plate, the adjustment of each mechanism should be accurate and cooperate with each other. Accurately fold according to the requirements of the order, and ensure that there will be no wrinkles and no smud on the printed products.

The above content is selected from the 9th issue of “Printing Technology ·Digital Graphic Arts ” in 2012. More journal content please pay attention to the journal channel, and the latest journal content clicks into the electronic journal channel of Keyin.com.


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Square Double Sided Light Box

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Material

Aluminium/ Stainless steel/ Acrylic Panel

Size

Customized

Lighting Colour

White/ Pink/ Red/ Green/ Blue/ Yellow etc.

Lighting Source

Led Strips/LED module

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Waterproof/ Low Consumption / Bold Visual Effect etc.

Safe Voltage

Normally 12 DC, 110V~230V

Processing

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Average Life Time

>60,000 hours

Working temperature

-20℃~60℃

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3M adhesive, Back screw bolts fixing or hanging, with 1:1 fixing template and accessories for Installation Reference

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Shipment

By express:(TNT/UPS/DHL etc.):4-5 Days

By Air:5-7 Days

By Ship:25-35 Days

OEM/ODM

Accepted


Models pictures:

Square

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