5 Hot stamping process and processing of luxury hardcover book covers Luxury hardcover stamping is generally semi-mechanical operation, that is, manual stamping machine. The hot stamping materials used in luxury hardcover stamping are mainly red gold foil, some are made of color film and pure silver foil, and some are concave hot stamping plate. 1. Red hot gold foil process 1) Preparation before hot stamping Preparation before hot stamping mainly refers to the selection, production and processing of various hot stamping materials, adhesive materials and plate materials. The quality of the preparation work directly affects the success of the hot stamping work and the quality of the quality, so it must be done carefully and meticulously. ①Preparation of hot iron. Cut the red gold foil to the required format according to the area to be ironed. The small red gold foil after cutting must be stacked neatly; the cutting of the ironing material must pay attention to the size. Big waste of materials. ② Preparation of adhesive. Because the red gold foil (or pure silver foil) itself has no bonding properties, it is necessary to apply adhesion promoter materials before hot stamping. There are two commonly used adhesion promoter materials, namely adhesive powder and adhesive liquid. The sticky powder includes rosin powder and egg white powder, which is used for the ironed objects with permeable ability on the surface, such as fabrics; the sticky liquid is used for the leather-type ironed objects with no pores on the surface, and the material is mainly shellac, with an alcohol solution Use after soaking and dissolving. ③ Make hot stamping plate. The material of the hot stamping plate is copper plate (red copper), because the copper plate has good heat resistance, moderate properties, and is not easy to deform, which can achieve a good hot stamping effect. The height of the hot stamping plate (the protruding part of the writing) can be selected according to the different textures of the material to be hot, such as the hot stamping fabric velvet hot stamping plate height is higher, and the hot stamping smooth leather hot stamping plate height can be smaller It is generally appropriate to master between 1.5 ~ 3mm. When using a concave hot stamping plate to emboss (ie, the surface of the hot stamping plate is concave, and the hot image is convex), pay attention to the depth and smoothness of the concave surface, so as not to cause the convex image to be unstable after hot Or not clear. 2) Previous version operation The upper version refers to the working process of firmly bonding and positioning the produced hot plate on the upper iron plate, and adjusting the lower regulation strips correctly after bonding and positioning. Before publishing, you must first check whether the graphics and text of the hot stamping are consistent with the original, whether there are any errors in the volume, whether there is any problem with the hot stamping method, etc., and you should check again whether the surface of the hot stamping plate is smooth. Only then can the upper version be glued. ①Operation of hot stamping plate on the front cover. The hot stamping on the front cover refers to the hot stamping on the surface of the book cover (that is, the first sealing position). Before publishing, take a piece of offset paper of about 180g / m2, mark the size according to the print (ground into a rough surface), and then use sandpaper to remove a layer of corrosive agent on the back of the copper hot plate, and apply adhesive on it, according to the regulations Glue it firmly in the size position; at the same time, stick three strip rule plates on the lower plate (the bottom plate of the machine), and then use the bottom of the waste book shell to press and bond the upper hot plate and the lower rule plate firmly. ②Upper middle waist hot stamping plate operation. The upper middle waist hot stamping plate adopts the method of taking the middle diameter width as the rule (the square back can be positioned by the middle seam slats). During operation, a piece of cardboard with a thickness of about 5mm (can be laminated), the same length as the book case, and the same width as the middle diameter cardboard is glued to the correct position of the lower hot plate as the rule for hot middle waist plate. The method of hot stamping is the same as that of hot stamping on the front cover. When the upper hot printing plate encounters a gravure plate, a relief plate with the same specifications as the intaglio plate must be placed on the lower regular plate to ensure the effect after hot stamping. The operation requirements of the previous version: A. The positioning specifications of the hot stamping plate are correct after sticking, which meets the design requirements of the layout; B. The layout is smooth and free of burrs (especially the concave version), firm adhesion, no warpage, dropout, and running ; C. The height of the lower slat should be less than about 0.5mm of the thickness of the bookcase cardboard to ensure hot stamping pressure. 3) Gold foil laying operation Laying gold foil is also called feeding, that is, the operation of laying red gold foil on the hot stamping plate. The purchased red gold foil is packaged in a carton, with a sheet of gold foil separated by a layer of paper. When hot stamping, firstly cut the large-format red gold foil into the required specifications of small format according to the size of the hot stamping area, and the stacked gold foils are placed in the carton at a slight angle and ready for use. The red gold foil is directly laid on a hot plate with a certain degree of heat. The thickness of each gold foil is only about 1µm. Its weight is particularly light. It is not careful when operating. When it encounters airflow (the operator speaks, breathes, and lays gold) (Pause, etc.), the gold foil will fly into clumps, which cannot be spread on the heated hot plate and wasted. Therefore, it is necessary to have certain operating skills and carefulness when laying this hot material to ensure smooth processing. Prepare tools before operation, namely a pair of medical tweezers and a small cotton ball. During operation, put the carton with gold foil on the workbench board close to the hot plate (do not be too close to the hot plate to avoid the gold foil being blown up due to the heat of the hot plate), and the left index finger and middle finger are sandwiched. Cotton, hold the tweezers in your right hand (tweezers are about 140mm long, round head), gently lift the paper on the gold foil and throw it away, then tweez the gold foil together with a piece of paper under the gold foil at its end, gently follow the airflow The gold leaf tweezers move up and spread accurately on the hot plate. After laying the gold foil, use the cotton ball of the left hand to press it firmly on the hot plate to avoid being wasted by the hot air of the hot plate. Hot stamping can be done after laying the gold foil. Gold foil spreading operation requirements: A. The specifications of the cut red gold foil should be accurate and leave room to avoid wasting or missed spreading; B. The tweezers used for gold spreading should not be pointed, and the gold leaf should be accurate when lifted. Spread it smoothly and accurately on the stamping of the hot plate; C. When the gold is broken or wrinkled in the middle of the gold plating and cannot be covered with the hot mark, it needs to be re-paved to avoid the leakage of the hot plate; D. After the gold is used The cotton ball gently presses the gold foil firmly to avoid the waste caused by the falling of the gold sheet during hot stamping. 4) Hot stamping operation The hot stamping of red gold foil is currently processed by a manual semi-automatic hot stamping machine with an upper hot stamping (or lower hot stamping). Hot stamping red gold foil is highly technical and requires the operator to have certain skills to master the pressure sensation during hot stamping to obtain a good hot stamping effect. Hot stamping is mainly completed in three steps, namely, coating adhesive, hot stamping, cleaning hot surface. ①Coated with sticky material. Since the red gold foil itself has no adhesive capacity, it must be coated on the object to be ironed (the surface of the book cover) before hot stamping, otherwise the gold foil cannot be ironed on it. There are two kinds of sticky materials, one is sticky powder and the other is sticky liquid, which are used on different objects to be scalded. Sticky powder is used on materials with gaps and permeability on the surface of hot objects, such as fabrics; sticky liquid is used on attractive materials with smooth and non-permeable surfaces, such as leather and plastics. One is liquid and the other is powder, and the two must not be used indiscriminately. There are three types of sticky powder: rosin powder, shellac powder and protein powder. Rosin powder and Cuban gum powder (ie bronzing powder) can be purchased, protein powder needs to be made by yourself. Preparation method of protein powder: extract the protein of several fresh eggs (according to the dosage) (not to be mixed with a little egg yolk), put it in a smooth storage tray, dry naturally (should not be exposed or baked), and then dry After the protein hard block is ground with a mortar into a fine powder for use. There are two types of slime liquid: shellac and protein liquid, both need to be made by yourself (nowhere to buy). Production of shellac: first prepare shellac (shellac or dry paint) and alcohol, the dosage is 100-200g shellac per 500g of alcohol, after sealing and soaking for 10 hours, the glue and alcohol are mixed to form a uniform liquid It can be used afterwards, and it should be shaken or stirred evenly before use. The preparation of protein liquid is very simple, as long as the protein is extracted, it can be used, but pay attention to the amount, because the protein liquid is easy to multiply bacteria, and it is also easy to dry. After the above adhesive material is ready, you can apply it. When applying sticky powder, use cotton ball dipping material to apply to hot stamping parts; when applying sticky liquid, use cotton ball or foam plastic dipping material to apply thin, uniform, non-overflowing flower In order to make the application accurate and not waste, a mold frame can be made in advance to ensure the quality of the application. ②Hot stamping. When hot stamping, we must master the temperature, time and pressure, these three are the key to ensure the quality of hot stamping (see Table 1). Fabric Time temperature A. When stamping a smooth book cover, the adhesive liquid must be completely dry before being applied for hot stamping; B. When hot-printing the suede, the hot-pressing of the velvet should be pressed firmly before the gold hot-pressing is applied, that is, the hot-pressing method should be used twice; C. The temperature and time of hot stamping are shown in Table 1. In addition to the contact pressure, the most important pressure is the hot stamping pressure. The ideal hot stamping effect should be achieved by the operator's skills. ③Clean up the hot surface. After the red gold foil is hot, clean the hot surface, that is, remove the extra gold pages after the hot, so that the hot marks are clear and beautiful. During operation, use cotton cloth or smooth bamboo board or plastic board to follow the edge of the picture and text, and wipe off (scrape) the excess hot material, but do not touch the damaged picture or text. The cleaned scrap gold pages should be kept in a Storage Box, because the red gold foil is a very expensive hot stamping material made of 24K pure gold, which is generally only used for high-value luxury books and albums. Therefore, although the remaining broken gold foil can no longer be used, it can also be recycled for processing. The quality standard requirements of hot stamping red gold foil: A. The time of hot stamping, the temperature of hot stamping and the pressure of hot stamping meet the requirements of the material being hot; B. The imprint after hot stamping is clearer than that of paste, pattern, and hot stamping , Firm and shiny. The position of hot stamping is accurate, the tolerance of the cover does not exceed 1.5mm; the difference of the middle waist table is less than 2mm (1/10) below the thickness of 20mm, the thickness of the above 20mm does not exceed 2mm, and the skew does not exceed 1.5mm. (To be continued) Cleaning Squeegee,Bathroom Glass Wiper,Shower Squeegee,Shower Cleaner Squeegees Qin Jian International Limited , https://www.luanbosmart.com