After that, the author calmed down and sorted out the bronzing process theoretically. As we all know, hot metal is in the field of hot stamping. Hot stamping is a special decorative effect formed by contacting anodized aluminum with a substrate, melting the adhesive by the action of heat and pressure, and stamping the anodized aluminum onto the surface of paper, wood, plastic or other materials. The reason why the adhesive can transfer anodized aluminum is because the outermost layer of anodized aluminum is composed of an adhesive layer. Anodized aluminum (also known as bronzing foil, commonly known as bronzing paper) is one of the most commonly used materials for modern bronzing decoration, and it shows its prominence in the bronzing business and process. If the combination of bronzing and screen printing gold and pasting gold is used to replace bronzing and used in white enamel fast food cups, what will the effect be? The author has tried boldly (practice) and found that the effect is very good. The following describes the operation methods and procedures one by one for the reference of colleagues in the industry. Select the 280 ~ 300 mesh screen, and make the required printed text into a screen according to the conventional plate making method. The graphic on the plate must be clear, the lines are full and smooth, the edges are hairless and thornless, and the font is full. Add gold oil and copper powder to a small amount of glass gold yellow ink (manufactured in Tianjin), and add an appropriate amount of DMP-130 high-efficiency additives to ensure the stability and color of the printed material (gold ink) (Note: the printing at this time The material is similar to the color of anodized aluminum), it can be used after being thoroughly mixed. The specific process is: Plate-making → Printing → Put anodized aluminum → Light pressure → Heating → Dry 8h → Remove anodized aluminum → Compensation overprint → Finished product points: (1) When printing, it is best to use a 65A90 ° angle scraper and tilt 45 ° ~ 55 ° , Manual scraping. (2) Printing on a self-made "inner cavity support type" curved printer, because the enamel fast food cup "belt handle" cannot be used for outer diameter support roll printing. (3) Print one paste one (the pre-cut anodized aluminum foil is larger than the graphic), and paste one to process one (Note: use a soft rubber strip or a sponge block to gently scrape the auxiliary pressure on the graphic part where the anodized aluminum has been attached) . (4) The interval is about 1h, then use a temperature-adjustable electric baking gun to heat one by one, heat to dry for about 6 ~ 10h, and place it for 8 ~ 10h. After the bottom of the printing material is dry, the anodized aluminum is removed, and the printed parts are displayed A clear and bright picture of anodized aluminum (Note: At this time the transfer of anodized aluminum has been achieved). This method not only meets the requirements of customers, but also improves the quality of printed products. It can also be used to decorate small batches of ceramic cups and stainless steel fast food cups (but not suitable for transparent glass cups). (5) When anodized aluminum is used for hot stamping, it is necessary to use a product with a close production date. The effect of placing it for more than half a year or more is not ideal. Anodized aluminum is preferably 18 # or a single piece of pure gold foil, preferably Japanese 2 # metal foil. Note: ①In order to prevent the incomplete transfer of the anodized aluminum and affect the appearance of the overall pattern, the pressure when rolling the auxiliary pressure after attaching the anodized aluminum should be uniform, so as to ensure the complete transfer of the anodized aluminum foil layer. ② After the graphic printing of the enamel cup, attach the anodized aluminum immediately, the time should not be too long, because the dryness of the printing material will directly affect the transfer effect of the anodized aluminum. The last process is to compensate and reinforce the overprint. Use 200-mesh silk screen and take UV-MI-20N metal varnish to cover the above enamel snack cups (cover). The area of ​​the cover is slightly larger than the graphic size. The fast-food cups covered (covered) with varnish have good adhesion after UV light solidification, and are resistant to washing and abrasion. 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Talking about the high simulation bronzing method
As we all know, the customer base in the printing field comes from all walks of life, and the needs and requirements are also diverse and unique. One day, a customer requested hot stamping on 300 sets of white enamel fast food cups (with logos and text) (Note: The customer is very stubborn and does not agree to print gold directly on the screen, he said that the gold printing is not bright and not graded) . Faced with the strong demands of customers and the need to live and rush, a small number of small bronzing businesses, the author really feels a little tricky and at a loss. It's a shame to push away this job and the kindness (Note: The customer came here for admiration), it's really a bit difficult to take over this job! Only a few can be left to do the experiment and explain to the customer, because there is no curved surface hot stamping machine (equipment) It can only be operated by local methods. It is difficult to say whether the effect is ideal. You can only try it first. If you are satisfied with the finished product, you can do it. If you are not satisfied, ask them to find another expert. The customer nodded with a smile in agreement.