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Operating experience in producing 32 folio double copies

generally, the printing of books and periodicals must go through three processes: prepress, prepress and binding, of which binding is the last process and the most critical one. Because the ultimate goal of printing is to produce products, all work should be done around binding. It is not enough to only rely on the introduction of advanced binding equipment, but also to ensure the continuous and efficient operation of production equipment, and to ensure the smooth production by using scientific and reasonable production technology. Here, the author will exchange some operating experience in the production of 32 open double copies of paperback adhesive binding package with peers in the industry

at present, the finished specifications of textbooks are mostly 16 or 32 folios, and the binding method is mainly paperback adhesive binding package. Due to the large printing volume, the main body printing method is rotary printing, supplemented by single sheet offset printing. Among the 32 open books, the mass binding is mainly based on the production of double copies. In plate making, the printing workload changes little. Adjust the span of the two supports of the zigzag attachments. Using the production of double copies, the efficiency of the binding process can be increased by more than 50%, which is a commonly used binding method for book printing

prepress process should be considered comprehensively

first of all, it is necessary to master the actual operation of the production equipment of the unit, mainly in terms of operability, and formulate the prepress process of paperback adhesive binding 32 open double copy package. In the common 32 folio paperback books, the paperback adhesive binding package is used for single binding or wireless adhesive binding. The back thickness of the book is 3 ~ 25mm, which can be designed as a double binding package. Take the size of large 32 opening 148 ~ 210mm as an example, the folding width of the text is 153 ~ 216mm, 4mm sawtooth is left between the upper and lower couplets, and the layout center is centered in the finished product after subtracting 5 ~ 7mm of the set opening. The size of the split large version is 612 ~ 872mm, which can meet the requirements of 880mm, 890mm rotary printing machine and 890 ~ 1240mm sheet fed printing machine

from the perspective of all production links, it should be noted that the specifications of the folding marks of the upper and lower couplets should be different. Considering the convenience and operation habits of making up, the folding marks of the upper couplet are generally 4 ~ 10mm and the lower couplet are 4 ~ 20mm. The main purpose is to remind the bookbinding and matching operators that this is the first bookbinding of this product. Similarly, the folding village of the upper link of the last book can also be designed as 4 ~ 20mm, marking that this is the last book of the product. In this way, when the semi-automatic assembly line or manual production is used, the quality of the matching book can be monitored and the production of more and less books can be reduced

in order to effectively strengthen the quality monitoring and the convenience of future search, generally add vertical No. 7 character book label, crease mark, edition, shift mark and other marks at the back of the book, and add vertical No. 4 ~ 2 character book label, edition, edition number and the code of the stitching operator of the book, the file name and path of the output large piece (or CTP plate) at 1 ~ 2mm outside the folding line of the book block with the largest code. At the same time, the process design of the cover also needs to correspond to the text

printing precautions

when printing on the machine, both the text and the cover should be printed in the middle of the left and right, and the specifications should be consistent before and after. Especially when printing on the sheet fed offset press, the direction of its mouth and pull gauge is wrong or the positioning is irregular. Walking too far will bring great trouble to the binding and folding, and even can only be folded manually. The amount of fountain solution should be controlled to prevent printing products from deforming due to excessive water absorption. When printing on a sheet fed offset press, excessive water will cause uneven printing sheets and curling on both sides, which will make it difficult to process on the folding machine and affect the production progress

for the text bookpastes printed by the rotary machine, after getting off the machine, the codes are neat first, and each layer is staggered. Generally, the bookpastes with 20 reams of paper per board are placed for 4-8 hours. After the ink is basically dry, the bookpastes with a height of 40-50cm are bundled into a bundle by the bookbinding machine, and then bound with wood mattresses before being sent to the binding process

when the workshop air temperature trap or not binding in a short time, it is necessary to cover the semi-finished products with plastic covers to prevent moisture. This work looks complicated, but it plays a great role in improving the binding efficiency of books and periodicals, preventing the deformation of books and periodicals, keeping them flat, and contributing to the normal operation of semi-automatic and automatic book matching lines

for the case that Martini and other adhesive binding coupling lines are used after printing, the book stickers should be flattened with a flat press of more than 10 tons after the folding is printed by a rotary machine, and finally bundled and stacked. If you have any questions, please call us to send them neatly for binding

binding is the key

according to the arrangement of the technological process, the folding of the pages printed by the sheet fed offset press should also be in the form of adding boards to bind, so as to keep the forming characteristics of the book paste flat

if the production method of manual or semi-automatic paperback adhesive binding is adopted, the back of the book should be shaken up before checking the book after the book is matched into a woolen book, and the thin back glue should be brushed to prevent the woolen book from scattering

generally, loose books should be vibrated and mixed well before gluing this single machine. Whether the books and periodicals are bound by paperback adhesive binding single machine or wireless adhesive binding coupling line, the plane or the safest means of transportation in the world must pass through a flat press of more than 10 tons before binding. The purpose of the flat press is to eliminate the air in the book and maintain the flatness of the book block, so as to ensure that the book and the three-sided knife will not wrinkle and collapse when cutting. This is a very critical process. We have done a comparative test. Without the flat pressing book block, the back of the book is easy to be hollow, not square, and easy to form an arc shape. At the same time, when double cutting, the back of the book is easier to wrinkle, and the two ends are easy to collapse, affecting the binding quality

from the actual operation, we found that when using three side cutting to cut the double bound bound book, if the back thickness is greater than 8mm, when cutting the second copy, the back will have a wrinkle of 4 ~ 15mm. At this time, we can only use the dividing machine to divide it into two single books first, and the original 4mm saw will come in handy. Generally, the cutting edge of the dividing saw blade of this machine is 3 ~ 4mm. You can first put the double copy of the newly bonded bound book for 1 ~ 2 hours, and then divide it into single copies after the hot melt adhesive is cooled and dried, and send it to the three side book cutting machine to cut the finished products. After passing the inspection, it is packed and delivered out of the factory

strengthen sampling inspection

in order to ensure that the ex factory products can meet the 100% qualification requirements of the national publishing corps, good products should account for more than 30%. In addition to the pre press, printing and post press departments' self inspection according to quality standards, we also specially equip independent professional technical quality inspectors in these three processes. Spot check the products in each daily process according to the quality standards, strengthen the spot check of key products, and even inspect them one by one, and maintain 100% inspection of prepress products. If problems are found, they should be solved immediately without affecting the construction of the next process. At the same time, the work records of inspection should be made, and we should be good at summarizing experience and formulating preventive and preventive measures

the binding of the author's unit is semi-automatic paperback adhesive binding production, and the matching, sorting, wrapping, cutting and packaging are all manual and semi-automatic auxiliary. Relying on three disc adhesive binding and wrapping machines, the daily output of the production of the combined book can be stabilized at about 200000 single books, and the progress can be the same as that of the martini adhesive binding line. The equipment investment is less than 30% of its price, but the economic benefits are considerable

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