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How to confirm the cover printing get the perfect book cover
  • The release date:22-02-12 15:26
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In the printing process, the basic requirements are gauge to accurate positioning. Especially the printing cover, not only requires the printing color stability, and due to the finishing process is often covered with plastic film, lettering, UV varnish special process, the requirements of the gauge must have higher stability.
 
1.Lettering gauge
Due to the lettering content of the cover is generally not linked to the content of the printed material,small variations in printing rules don’t make a big influence in lettering quality.Lettering  content has a certain relationship with the printing content.So the lettering requirement of rule edge is the printings’,so as to assure the consistency of the same batch of lettering parts position.

2.UV Varnishing gauge
UV Varnishing version gauge should be consistent with printing gauge.The content of UV light oil is generally required to meet the requirements of printing content, so the requirement of connection error is especially high,generally at about 0.01mm.Because of sometimes the cover paper using loose special paper,easily deformed in printing.This puts a higher demand on the UV varnishing in the finishing process,so the printing gauge and UV glazing technology in the gauge must be unified. If the printing process with jump gauge (gauge instability) phenomenon, presswork must be carefully sorted according to jumping gauge case, respectively polished,and made an adjustment in UV varnishing version.
 
 3.Lettering + embossing gauge
If a presswork’s content is thermoprinted ,then hit after printing process,there will be two special processes composted in the same position and same content.This requires the error which is less than 0.01mm, so the lttering gauge , embossing gauge and printing gauge must be consistent.
 
4.UV varnishing + embossing gauge
The superposition of these two processes on the rules requirements are very strict , generally UV varnishing first and then hit convex.In the process of embossing,the error of UV varnishing process connecting may be due to the content of embossing leading to the UV varnishing connecting error not obvious.
 
Notice of cover printing
Generally,the common paper of the cover is determined more than 157g/m2,and special paper is determined more than 135g/m2. Because the paper is thick,especially at the time of printing pressing,change in water absorption of special paper is relatively large.In the printing,the paper deformation is large.The gauge paper positioning accuracy is particularly important.Generally,there are lettering,embossing,indentation,UV varnishing in the beautiful book after special printing process.So it is important that the control of the printing gauge and paper deformation match the gauge in the special process.
 
(1)Because the same pattern in the cover may need to process after printing for two times or three times.This needs to location process for several times.Therefore,it is necessary to make the content that needs to be processed by the post press close to the rule side, which is easy to make the press printing position is consistent with the position of the printing edge gauge, and is accurate.
 
(2)When cutting the paper, it is required to be accurate, tidy and with little error. The position of the feed edge and the cutting of the edge should be standardized and tidy, so as to ensure the correct positioning of the cover printing
 
(3)Strictly control the printing process. 1.Ensure the balance, under the premise of ensuring the quality of printing requiring water as small as possible, so as to avoid the deformation due to paper absorbing too much water;2.Control the temperature and humidity in the workshop.Temperature is 20~25℃.Humidity is 60%~70%;3.In the printing process,Edge drawing paper needs stability and the bottom gauge should be steady.4.The whole batch of the color of the cover should be consistent.
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