Source: "Printing World" Author: yellow leather 4v Lead Acid Battery,Rechargeable Mosquito Swatter,Acid Rechargeable Battery ZHEJIANG ZHOUHE TECHNOLOGY CO.,LTD , http://www.zohetech.com
1) According to the arrangement of the technological process, after the pages printed by the sheet-fed offset printing machine are folded by the folding machine, the form of the plus-board binding shall also be adopted to keep the formation of the signature flat. The performance of the existing hybrid fence folding machine is good. The paper below 105g/m2 can be fully folded perpendicularly and 4 fold can still meet the requirements of the quality standard. 32-fold double-folding should be 3 fold, and the entire book folds attention. To give the book a flower knife to let go, the pages are folded tightly, keeping the signatures tidy.
2) For the post-print production method using flat-packed linkage, after the rotary or single-sheet machine has finished folding, there should be a condition where 10 tons of flat press is used to flatten and then the bundling code is neatly sent to the linkage line. With the package can not be linked to high-speed synchronization problems, thereby improving production efficiency. Since the packaged part of the new rubber-bonded linkage line introduced at home and abroad is designed to be more reasonable and practical, special secondary milling backs, special frequency conversion slots, secondary back adhesives, frequency conversion upper side glues, and straight lines are specially provided for the glue-set products. The upper sealer and the secondary holder are strongly used to ensure the assembly quality of the assembly, so that the book block can also be packaged with high quality products without flat pressing. For example, the ZXJD-440C Medium and High Speed ​​Rubber Bonding Line from Ziguang has the above configuration. .
3) If the production method is manual or semi-automatic flat assembly line production, the signature of the book should be dubbed as a hairline, and the hair should be shaved and the spine brush should be used to make the hair free. This work can not be saved, and generally the book on the loose copy of the book shaking the package out of the book, than the book behind the first package of the book is flat to the poor, often the book has been skewed failed to mill in place, easy to appear Open plastic off pages and other non-conforming products. Whether it is a flat-glued or rubber-bound book, before the upper disc or the straight-line pack of the local pack, it is necessary to flatten the prepared book block through a 10-ton flat press. Without the flat pressure of the book block directly packaged, the book back easily from empty, not square, easy into a circular arc shape.
4) Milling book back, groove quality is very important
â— The amount of milling on the back of the book should be based on the thickness of the folded signature, so that the last page of the signature can be milled into a single page, the back of the book can be milled into a plane, and the thickness of the adhesive layer can be evenly coated.
â— The back of the book must be pulled out, keeping the depth and spacing of the pull grooves consistent. The quality of the milling slot is directly related to the book's adhesive strength and quality. To reach the initial tensile strength and bond strength of the book, the pitch of the drawing groove is 3 to 5 mm, the depth of the groove is 1.0 to 1.5 mm, the shape of the groove is “U†type, and the shape of the groove is preferably “mouthâ€, which is advantageous to Fill the glue evenly into place and increase the tensile strength of the book.
â— It is necessary to pay attention to the proper use of clean-up book backs and brush to maximize the removal of confetti and make the glue even and penetrate the pages.
5) Control the amount of glue coating, the length of brushing, the starting position of brushing (can be achieved by adjusting the distance between the scraper, the rubber wheel and the back of the book, the rubber wheel and the rubber cam working surface, generally the rubber wheel and the book back The distance is 1.5mm, and the length of brushing is about 2mm shorter than the cover).
6) Strengthen the temperature control. The thickness of the book back adhesive layer also changes with temperature, and should be operated strictly according to the operating temperature of the hot melt adhesive. When the weather is cold, it can be appropriately increased by 5 to 10°C. In the operation, the temperature of the glue must be controlled well, and each captain should be equipped with a digital display probe thermometer to supplement the amount of glue in a pre-melting manner. Although the pre-melting glue pan on the linkage line is large, the quantity of glue to be added is small, the ground is hard to be added, and the temperature is kept stable. It is not allowed to directly add the hot-melt adhesive to the glue pot, causing artificially new quality problems. If there is a large temperature difference between the interior and exterior, it is necessary to consider whether the signature or book block to be packaged should be adapted to the workshop environment in advance.
7) Strengthen the maintenance of the binder machine. Because the book holder, the glue brushing mechanism, the cover conveying positioning, and the hitting forming mechanism will have certain wear and tear on the transmission parts after a certain period of operation, the working clearance will increase, which will affect the transmission accuracy, and regular inspection and maintenance of these parts shall be carried out. And adjust, compensate until the replacement and complete work records, in order to maintain the accuracy of their work transfer, thus stabilizing the quality of the package.
8) EVA hot melt adhesive glue pot cleaning and storage. Preheating glue pans and glue pots should be regularly cleaned and kept clean to prevent impurities from depositing on the edges of glue pans and glue. Generally, the glue pot is cleaned every 10 days, and the preheated plastic pot is cleaned every month. The remaining glue can only be used as a back glue. Hot melt adhesives should be stored in ventilated, dry and cool places, avoid exposure, high temperature, baking and rain, and mixed with chemicals. In order to ensure the stable performance of hot melt adhesives, inventory is generally required to be used within one year.
9) Different types and performances of hot melt adhesives are not allowed to be mixed in principle. Because different types and properties of hot melt adhesives have different application scopes, they are not allowed to be mixed in principle so as to avoid creating new quality risks. In some specific production processes, for example, the offset paper book has been glued and it needs to be changed. When setting a copper-coated paper book block, when there are 500 to 1000 left, it is possible to inject a pre-warmed suitable coated paper special hot melt adhesive into the plastic pot, which can reduce the waiting time caused by changing the plastic pot and thus affect the production progress, but When the coated paper book core glue is to be converted into offset paper bookbinding, it is necessary to inject the pre-heated suitable offset paper hot-melt glue into the glue pan until the coated paper book core has been wrapped.
10) It should be purchased in bulk from large companies that have the qualification and reputation for producing EVA hot-melt adhesives. After the actual varieties are tested in accordance with the actual quality requirements, it is best not to replace them frequently in the short-term, otherwise it will be difficult for operators to adapt. From.
4 Strengthen the quality inspection
1) In order to ensure that the manufactured products can meet the quality standards of 100% qualified and good products accounting for more than 30% required by the General Administration of Press and Publication, the technical quality management department also provides independent full-time technical quality inspectors as routines in these three processes. The patrol inspection is not only the supervision and technical guidance for the implementation of the quality management of the production department, but also the requirements for the technical and quality management work of the company.
2) Each batch of daily routine sampling of batch products according to quality standards shall be promptly resolved on the spot, and the defects of product quality shall not be hidden, which will affect the construction of the next process. Key products should increase sampling efforts or even page by page, page by copy, check by copy, maintain 100% inspection of prepress products, ensure that qualified and good products account for more than 80%; printed products account for more than 70% of good products; bound product good products It takes more than 50% to achieve the quality requirements for good products accounting for more than 30% of the requirements of the General Administration of Press and Publication.
Analysis of Quality Management of Commonly Used Wireless EVA Binding Technology (2)
3 Bookbinding Precautions