The most hot gold embossing concave convex synthes

2022-09-23
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Bronzing and pressing concave convex synthesis complete the process operation at one time

in the past, our factory undertook various wine bottle labels and cigarette boxes, where bronzing and pressing concave convex are required, we adopt two layouts, bronzing first and pressing concave convex twice. For the pattern that needs to be bronzed, the negative film is made during plate making, and the positive film is made during plate making of concave convex plate. When pressing concave convex, the concave convex operation can only be carried out after the negative zinc plate is put on the machine and the gypsum convex plate is copied. The gypsum copy plate is not easy to do, and it takes time and labor, and the defect repair is also difficult. It is very easy to wear when pressing concave convex. After reform, the convex template was copied by replacing gypsum with rubber tape, that is, two pieces of rubber tape corresponding to the size of the pattern concave zinc plate were pasted on the base plate table with low efficiency double-sided adhesive tape. The area of one piece close to the base plate was slightly larger than that of the pattern concave zinc plate, and the area of one piece on the surface was slightly larger than that of the raised pattern by about 1.5cm. After pasting, the pressure could be adjusted appropriately according to the thickness of the printing paper and the embossing height, and then the normal operation could be carried out. After the process improvement, although it has many advantages, such as simple and time-saving plate loading, improving efficiency and printing plate printing resistance, shortening product cycle, etc., it often causes local expansion and deformation of the paper due to the influence of bronzing temperature, resulting in uneven overprint and unsatisfactory quality. In particular, patterns such as medals, logos, pavilions and pavilions are often required to outline the framework and outline of the pattern with concave and convex fine lines on the basis of on-the-spot bronzing, which makes the quality more impossible to guarantee and even more inadequate. In order to solve this problem, we boldly developed and repeated experiments, and better solved the bronzing and embossing synthesis, so that the bronzing and embossing can be completed in one operation

combination of bronzing and embossing, but whether placed vertically or on the side, it combines the bronzing area pattern and embossing part pattern Yin and Yang into one. The new material industry in Hubei Province has an average annual growth of 17.6% organic whole film plates. After special process treatment, after printing and corrosion, bronzing and embossing plates are made. In the convex part of the finished product, the zinc plate is concave, the concave part of the finished product is convex, and the zinc plate is introduced as follows:

bronzing and embossing negative film synthesis: according to the design requirements, the photographers first paste the drawn original with the yin-yang cross rule line and shoot it into a yin-yang image ①, and then the yin-yang image ① is copied, developed and fixed normally to obtain a Yang image ②, Later, the negative image ① is still copied, and its exposure time is several times longer than that of the normal exposure positive image ②. After developing and fixing, a positive picture ③ with thicker outer contour line is obtained, and then the pasted outline of the positive picture ③ is filled with black ink. After the positive picture ③ is dry, it is copied with it, and the negative picture ④ with transparent outline is copied with less exposure and more development. At this time, the positive picture ② and the negative picture ④ are combined, that is, the Yin and Yang cross lines of the two films are overlapped and assembled, and then glued firmly with adhesive tape, which is directly used for printing, so as to produce bronzing and embossing plates. You can also copy the assembled film to the negative and turn it to the positive to get a clear outline of the positive figure ⑤, and then etch the positive figure ⑤ to make a bronzing and embossing version. From the exposed zinc plate image, it is required that there is a thin solid line around the protruding lines and patterns of bronzing, which is very important to complete the process of bronzing and pressing concave convex synthesis at one time. It is mainly used for cutting the bronzing and non bronzing parts. At the same time, if there is a convex requirement around the edges of the patterns, the thin solid line will be convex after corrosion, while this part of the paper will be concave after bronzing and pressing concave convex, Visually, the concave edge of this part sets off the effect that it is a convex part

bronzing and embossing plate printing: the pattern on the synthetic shaped bronzing and embossing negative is exposed to the zinc plate, after washing, dyeing, film hardening, and then baking at a high temperature of about 190 ℃ and plate trimming

corrosion of bronzing and embossing plates: ① shallow corrosion, put the zinc plate baked and trimmed at high temperature in 6 BC nitric acid solution, and use a brush to carry out shallow corrosion treatment. According to the thickness of printing paper, determine the height of embossing, and determine the depth of shallow corrosion, so as to achieve the effect of pre corrosion. Generally, the corrosion depth is about 0.1mm and 0.2mm. It can meet the requirements of bronzing and embossing about 80150 grams of paper. If the paper is more than 250 grams. Hot 3. The use of fatigue testing machine. The corrosion depth of gold and pressure bump can be deeper. ② Local filling: after the shallow corrosion meets the requirements, take it out and wash it with clean water for drying, and then fill the anti-corrosion lines and patterns of the parts that need to be bronzed and pressed with anti-corrosion glue to achieve the protection of the picture. ③ Deep corrosion: fill the covered zinc plate. It is installed in a powder free corrosion machine. The construction operation is carried out according to the normal corrosion time and requirements, and the edge corrosion depth is generally about 0.6 0.65 mm

bronzing, embossing and mounting: before mounting, the surface of the electrothermal plate should be cleaned, and some stripes should be drawn on the back of the bronzing and embossing zinc plate. A cloth block slightly larger than the zinc plate coated with floating white glue (or cow hide glue) should be pasted on the electrothermal plate according to the determined mounting position and printing method of the zinc plate, and then the zinc plate should be pasted on the cloth block of the electrothermal plate, some hard paper should be placed on the bottom platen, and the power supply should be turned on and heated to 8090 ℃, Hot press for about 15 minutes, so that the zinc plate is firmly pasted on the electric heating plate. After the zinc plate is firmly pasted, paste a piece of copper plate paper of more than 100 grams on the bottom platen with transparent adhesive tape, and touch the impression sample with carbon paper. Taking this as a moment, cut another 23 pieces of 250 grams of white board paper slightly larger than the image and text of the impression sample. After it is overlapped and bonded firmly and smoothly, paste it to the position of the impression sample, and remove the impression copper plate paper. After 250 grams of whiteboard are glued to the bottom platen, wet the top layer of whiteboard with a wet towel, and close the bottom platen with pressure until there are traces of rich concave convex layers on the surface of whiteboard. It should be noted that the whiteboard should not be padded too high, or the pressure should be increased by pressing, so that the parts of the surface that do not need to be bronzed and pressed are higher than the parts that are bronzed and pressed, and the parts that are not bronzed and pressed are also ironed with anodized, which will affect the beauty and quality of the picture

temperature control of bronzing and embossing: bronzing and embossing are completed in one operation, so the bronzing temperature is higher than that of individual bronzing; The temperature is generally controlled at about 150 ℃

pressure adjustment of bronzing and embossing: when officially starting bronzing and embossing, it is also necessary to re check and adjust the pressure. The layout is required to be uniform up, down, left and right. When observing from the back of the embossed paper, as long as there is a clear level of embossing, you can start bronzing and embossing normally. As bronzing and embossing are secondary corrosion, the concave surface is relatively uneven during corrosion. During hot stamping, a layer of elastic liner such as plastic film can be appropriately padded according to the situation, so as to make up for the disadvantage of not being able to use anodized due to concave and uneven hot stamping

practice has proved that the process of bronzing and pressing concave convex synthesis is completed at one time, with satisfactory effect and reliable quality reputation. In addition, it has the advantages of simple operation, improving work efficiency, shortening cycle, reducing labor, reducing consumption and increasing benefits

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