Analysis of two common quality problems in book adhesive bonding
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: 860681365@qq.com
Book glue binding is a necessary part of the book binding process. This process is completed well and will greatly enhance the appearance of the book. If there are quality problems, it will undoubtedly reduce the grade of the whole batch of books. The bookbinding quality is not enough only by the responsibility of the glue-binding workers. It also involves the technology, production process, raw material quality, workshop production environment, and even the local climate. Therefore, it is necessary to analyze the common quality problems. And explore.
Quality problems caused by adhesive binding equipment
1. Double cover and broken sheet (no cover)
The double cover is caused by the angle of the nozzle of the machine and the amount of blown air. The air volume can be adjusted first, and then the angle of the blow nozzle can be adjusted. Generally, rigid paper requires a large amount of air, and the angle of the air duct is generally 20 to 40. It is appropriate. The broken piece is generally caused by the inaccurate cooperation time between the nozzle and the pressing wheel. The pressing wheel fails to convey the entire cover, the nozzle lifts the work, and the second half of the cover is attracted to cause the break. When adjusting, loosely control the fixing nut of the nozzle, turn the cam, and let the pressure roller turn all the cover, and then the nozzle can perform the second work.
2, the book is not neat
The large chuck transports the book that has been wrapped on the cover to the receiving position, and the book falls after the clamping is opened. Because the large chuck is higher than the suction device, the book will produce shock and vibration when it falls, and the continuous operation of the large chuck will increase the impact of the falling of the book, and the falling body will produce a rebounding force, resulting in an untidy collection. At this time, the book receiver should be raised to reduce the impact force and enhance the sinking hardness of the book receiver.
Analysis of common quality problems of finished products
1, wild rubber
Wild rubber is the most common adhesive-bonding quality problem in bookbinding. It is mainly related to the running condition of the adhesive-bonding equipment. If the bookboard is loose, the running track is worn, and the book moves, the vibration will generate wild rubber. After the rubber wheel is worn, the diameter of the front and rear wheels is different. After the front wheel is glued, the rear rubber wheel is not completely smoothed, and the wild rubber is also generated. In addition, the technical performance (such as the melt temperature, the package speed, etc.) of the adhesive binding equipment during operation is unstable or does not meet the requirements, and wild rubber is also generated. Therefore, to avoid the generation of wild rubber, firstly, the equipment should be fully adjusted. Parts with excessive wear should be replaced, and the temperature and output speed of the hot melt should be strictly controlled within the technical standards. These data can be used in small samples. Determine after performing the machine test.
2, empty back
The empty back greatly affects the beauty of the book, and in severe cases, the book is off the page and scattered. The occurrence of empty back may be due to serious problems in the hot melt adhesive itself. For example, the hot glue contains many impurities, and bubbles are generated during melting. It may also be that the amount of glue is small or the glue is not uniform, and the surface of the rubber wheel is insufficiently in contact with the book block, or The running wheel is caused by the parallelism difference. In addition, the contact between the scraper rubber and the book block is too tight or the rubber is too hard, so that the glue that has been brushed is scraped off, resulting in an empty back.
The solution is:
(1) Select a hot melt adhesive with better quality, which can be determined after trial in small batches;
(2) Adjust the machine so that the surface of the rubberizing wheel is in good contact with the book block. Loosen the connecting rod nut first, raise the height of the upper rubber plate, and then loosen the fixing nut of the rubber plate to make the book core and the surface of the rubberizing wheel parallel and good. contact;
(3) Adjust the distance between the rubber and the book block so that the rubber is not in close contact with the book block, or the rubber can be softened.
3, overflow glue, pulp mouth width is inconsistent
The slurry mouth is controlled by the glue binding machine to brush the rubber teeth. If the rubber sheet is in poor contact with the book block, or the parallelism of the rubber sheet is poor, the gap of the glue or the mouth may be inconsistent.