How to deal with technical problems in rubber books (2)

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Third, pre-press spelling and glue binding

1. The bookbinding bookbinding mouthpiece is 1mm larger than the booked mouthpiece, and it is 2mm in order to be used for rubber binding, milling, backing and grooving to ensure that the milling cutter has enough milling back dimensions and groove depth.

2. In the glue-binding process, in order to prevent the quality problems of the wrong posts and the less posts, the second check of wrong posts and less posts was made. There is a simple and feasible method: on the basis of the original ridge-stepped placard block (awareness), another step-like placard block (awareness) is also added to the celestial part of the signature so that the back of the book can be milled on the back. After slicing and covering the cover, solve the second pass through the head to check if there are any quality problems with the wrong posts and less posts.

3, processing books with Le mouth of the book block, in the glue before making pull (open) processing. That is, on the basis of the original size of the original wide widened 1.5mm?? 3mm, so that it completely guarantees that the product of the book block in the milling back slotted book meets the standard size of the finished product. When the book block is milled with a 1郾郾5mm puller in the milling back slot, the incision is increased by 1.5mm. In short, when pulling the mouth, it is necessary to grasp the principle of determining the pull in accordance with the principle of different paper and folding number. The number of incisions increased in the version to ensure the book's standard cut size.

4. At the same time, when spelling out the large version of the cover, the white edge of the cover should be designed to increase about 5mm. The white edge can be used as a "reception station" for glue, which helps to prevent the glue from leaking out of the cover during the glue binding process. First, it can prevent the remaining glue from leaking into the shaping clamp. Second, it can prevent the book from being I have a dirty gummer.

IV. Preparation before rubber binding

1. After stacking the folded signatures: In the preparatory work for the binding of the books, no matter whether it is a straight plastic wrapper, or a combination of a circular wrapper and a glued production line, the folding quality of the signature will directly affect the forming of the book. The quality and operation of the complete machine will affect the book cycle and economic efficiency. From the situation of more than a dozen printing machines, the failures of over 50% of the machine's shutdown and neutral operation (including the linkage line equipped with a throwing device) are caused by non-standard folding and irregular stacking of signatures. Caused. In order to ensure the normal operation of the plastic wrapper, folded signature processing is the key link in glue production. The method is as follows: 180g or more of the four-folded pages are to be treated as a breach, and after the air in the signature is discharged, both ends of the signature are made of hardwood (the size of the wood is the same size as the signature) and the same length of the signature is formed by the binding machine. The bundles and signatures need to be bundled for more than 2 days. The dispatching time of the urgent signatures should not be less than 24 hours or must be flattened before collating. 2 After the collation of the book blocks used in the plastic packet machine, it must be used for bundling-placing-splitting process to ensure that the back of the book block is flat and the inside pages do not loose or fall. If the book is not accompanied by a paste, the loose copy is easy to be scattered or some stickers, page milling and backing are not in line with the standards, it is easy to page or loose. After the 3 folds of pages were bundled, some of the company's factory area was limited by the development of production. Only the signatures were bundled in the aisle and outdoor, and the books were bundled in the unheated warehouse in the winter. When the car was booked, the car was used. Shipped directly to the glue shop. Due to the large temperature difference between indoor and outdoor in winter, this will seriously affect the quality of the glue binding. When the glue is contacted with the book with the temperature difference, the surface of the back glue layer and the side glue layer drops instantaneously and shortens the hot melt adhesive. The solidification time and opening time, for the above problems to deal with and avoid the method is: the production arrangement, the winter at least one day ahead of the need to glue the book to be sent to the workshop and the same temperature of the workshop site stacking, for glue bookbinding Aging process, as much as possible to reduce the quality problems of the temperature difference between the signature and the workshop. 4 off pages, loose pages; page loss, loose paper is mainly related to folding. If the folding cover is too large and the page is not in position when the page is pinched, the air must be vented to avoid page breaks and page breaks (80g) or more, such as a fold or single page in the booklet. Good for sticky page processing, so that the problem of page dropping and loosening (removing the cause of the milling cutter) is solved.

2. Pre-work inspection of the plastic package machine: 1 Before the start-up of the domestic plastic package machine, it is necessary to pay attention to check the milling cutter pallets and milling cutters. According to the length of time the plastic bag is used, the sharpness of the milling cutter should be inspected on a regular basis, and the milling cutters that can't be milled out of the swarf should be replaced regularly; the pallets should be grounded to ensure the consistency of the pallet's working surface; The working team refuels at least two refueling points. 2 At the end of the work of each work class, it is necessary to clear the brush wiper and slotted knife in time to keep the guide surface clean. Careful maintenance and overhaul of the suction device and scraps discharge are normal, ensuring that the paper scraps are completely separated from the signature page during milling and backing. Paper scraps cannot be brought into the glue pan with the movement of the signature page. Instead, check the replacement pallets and milling cutters.

V. Evasion of common quality problems

1. The round back and the back of the book are not rounded and convex: 1 The cause is that the height of the pallet is not enough. It should be adjusted to the standard gap between the back and the pallet; the second is the increase in the cover weight, and the increase in the cover weight. Unindented lines or crease lines are extra wide. 2 For super-heavy cover paper used in glue-binding production, it must be indented. The crease should be equal to the thickness of the book block or less than the thickness of the book block, 0 to 5 mm. can.

2, book degumming, loose leaf: 1 book block milling back depth is not enough, the signature page is not completely milled into a single page, cause the book to degummed, loose pages, should increase the depth of milling back and improve folding quality. 2 Slotting, the depth of the slot is not enough to cause the book off and loose pages, the depth of the slotted knife should be adjusted, and the sharpness of the slotting knife should be maintained. 3 The temperature of the hot melt adhesive is too low to make the adhesive liquid flow poor. The hot melt adhesive cannot penetrate into the slot of the book block, which causes the degumming of the book and loose pages. The hot melt adhesive should be heated to 160°C~180°C. Use it right and left. The optimum melting point of the hot melt adhesive depends on the temperature of the shop (hot melt adhesive requires a shop temperature of 20°C? 鄄 30°C). In winter, heating equipment is required in the glue shop of northern enterprises; The workshop also needs heating equipment to ensure the quality of plastic bags. 4 book spine hot melt sol glue on the book caused by degumming, loose pages, should control the thickness of adhesive, generally controlled between 0.6mm ~ 2mm, and adjust the distance between the rubber wheel and the book back. 5 Improper use of hot melt adhesives is also a cause of degumming and loosening of books. Therefore, the choice of hot melt adhesive should match the type and season of the plastic wrapping machine. 6 After the milling slot, paper hair, paper dust and paper scraps should be cleaned in time to avoid brushing. 7 Coated paper, offset paper mixed binding book block, slotted depth, glue, etc. should be based on the two papers stick firmly.

3, the back of the book is not square: 1 using a non-sharp milling cutter back to cause the book back is not square, should replace the sharp milling back knife. 2 The adhesive on the adhesive does not cause the back of the book to be square, and the gluing mechanism should be adjusted to make the adhesive glue even. 3 If the improper adjustment of the pallet setting mechanism causes the back of the book to be out of square, the pallet setting mechanism should be adjusted. 4 The fact that the book is not well-ordered due to the fact that the book is not square should be well-organized to ensure the formation of the book. 5 The key to deformation of the spine is the short setting time, the rapid fall of the book, and the heavy fall. Especially in thick books, it is more prone to this problem. (Some hot melt adhesives have a long open time and can also cause the same symptoms.) The solution is: in the production, the size and thickness of the book block should be used to control the speed of the plastic charter; and at the same time, the speed of the book should be adjusted by paying attention to the principle of thick book and fast payment.

4. The cover is not even and the cover line is obvious: the amount of plastic on one side is too large, which causes the cover to be uneven and the cover to be clearly visible. The amount of side glue should be controlled. When the temperature of the 2 side glue is too low, the uneven side coating causes the cover to be uneven and the cover line is obvious. The temperature of the side glue should be increased. With the book type of the book block, the glue temperature is generally controlled at 120~160°. C around.

5, book cutting size is not accurate, etc.: 1 first check the three-sided knife positioning file, front knife, side knife, push the book car (book pusher) size is equal to the size of the cut open, "Jack" pressure is Suitably, the pressure of the two-side knife should be adjusted to 3 kg - 5 kg. 2 Three-faced knives, “Thousands of pounds,” have caused excessive pressure on the books and caused large and small books and a back cover on the back. 3 Three-faced knives are under pressure to compact books, cover without wrinkles and without upper and lower knives. 4 If the platform cutter appears to have a non-standard book size, it should be adjusted to the left and right ends of the gauge to be in parallel or to repair the backlash of the lead. 5 The platform cutter cuts the book size when the upper and lower blades appear and the indentation, should adjust the "Jack" pressure, at the same time to "thousands" presser foot with "wooden board", the wood backing plate does not affect the back and forth motion for the back and forth The standard, thus avoiding the platform machine knife to cut the presser foot indentation left by the books.

6. Bubbles and empty glue appear on the back of the book. There are many reasons for this: 1 The hot melt adhesive is damp, and when the water content is high, air bubbles are most likely to occur. The hot melt adhesive should be stored in a dry warehouse to avoid moisture. 2 The back of the machine is not even after the milling and notching, which causes gaps in the uneven glue application. Check whether the milling cutter and the slotting knife are sharp. On the contrary, timely replacement and grinding are performed to control the evenness of the adhesive. (3) Empty glue can also occur when the pallet is not parallel to the back of the book, and the pallet mechanism is adjusted.

In the glue-binding process management, when no preheating glue pan is produced, the amount of glue added to the glue pot is strictly limited, so that the amount of ground glue is not increased, so that the time of the glue in the glue pot is shortened as much as possible to avoid the hot melt glue. Aging. In practice, it is proven that the glue temperature of the book block core in winter is generally increased by about 10° C. compared to other seasons, and the glue temperature is controlled between 180° C. and 185° C., so that the viscosity of the glue is lower than 4000 mPa·s. In order to make the glue on the page to maintain a good wet performance. In the normal use of the hot melt adhesive 170 °C ~ 220 °C within the critical temperature of aging, strict control of the higher temperature, not only to maintain good infiltration, but also to make glue drawing phenomenon greatly reduced or even disappeared. Reduces or avoids the processing time of each process failure caused by the winding of glue, which is beneficial to improve the production efficiency of the whole machine.

In short, as long as we continue to explore and summarize from practice, we must carefully understand and master the properties of materials, process parameters, and the strict process operations in production. We are able to obtain gel-bound products that meet the quality standards.

Source: Greater China Graphic Arts Network

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