Basic understanding of hot stamping process and rational design of layout
The hot stamping process, in short, is to print a layer of colored foil (such as anodized aluminum) on the substrate. With the diversification and personalization of products, the color of anodized aluminum is beginning to become more and more abundant. In addition to the common gold, silver and copper colors, there are blue, green, yellow, orange, purple, brown, red and rose colors. , white, gray, black and other colors. Whether it is a color in the spectrum or not, it is now almost possible to find the corresponding color of anodized aluminum for hot stamping. In addition, laser foils with different color effects can be displayed, which greatly expands the range of visual effects.
Since the label area is generally small, the hot stamping pattern and color of the label are designed reasonably, which helps to reduce the production cost, and at the same time can take into account the label display effect, so that the hot stamping part plays the role of finishing touch and highlighting the label theme. Therefore, the label hot stamping area does not have to be designed too much, it is recommended to design important parts of the label, such as brand logo, product name, etc. into a hot stamping effect.
Need to be reminded that the color of the hot stamping foil and the background color of the label should not be too close, otherwise, the process effect of the hot stamping part cannot be highlighted. Only when the hot stamping part forms a strong contrast with other parts, can the effect of the hot stamping surface be better highlighted. For example, the background color of the label is yellow. If the gold is stamped, the hot stamping area is not conspicuous; if the surface of the yellow background is hot-printed with silver, red or other contrasting colors, the effect will be different.
Reasonable selection and quality control of hot stamping foil
1. Reasonable selection of hot stamping foil varieties and specifications
Modern label materials, in addition to conventional paper materials, have other materials that are not paper based. Different materials of the label, the selected hot stamping foil material should also be different, to consider the matching of hot stamping foil material and label material. For example, some anodized aluminum is only suitable for hot stamping of cloth labels. If it is used for hot stamping of plastic film materials or labels of other materials, it is easy to produce quality defects.
Without knowing the "market" of hot stamping foil, label companies may wish to conduct technical consultations with hot stamping foil manufacturers to clarify the characteristics of hot stamping materials, label printing and postpress processing. Suppliers will usually Give advice on the applicable hot stamping foil variety. The author suggests that for hot stamping of high-volume label products, it is best to purchase a small sample of hot stamping foil for trial production to accurately identify the adaptability of the process and the reliability of hot stamping quality.
Of course, the selection of hot stamping foil can also be more personalized, such as the anti-counterfeiting pattern and text on the hot stamping foil with laser effect, so as to adapt to the hot stamping processing of the customer's specific product.
In addition, there are many options for hot stamping foil specifications. In terms of width, the specifications generally range from 500 to 1500 mm. Under special circumstances, companies can customize the width of special specifications to meet the requirements of different orders. In terms of thickness, the thickness of the base film layer of the hot stamping foil is usually 12 μm, 14 μm, 16 μm, 18 μm, and 20 μm, and the domestic material is mostly 16 μm. The type of hot stamping foil is generally divided into 1 to 18, of which material No. 1 is generally viscous and No. 18 is the most viscous.
It should be reminded that the performance of different hot stamping foils of different suppliers or different suppliers may vary. Therefore, it is necessary to pay attention to observation and continuous summarization in order to select the hot stamping foil suitable for the product.
2. Quality inspection and control points of electrochemical aluminum
As the main hot stamping material, anodized aluminum can control the quality of the label to a certain extent to ensure the quality of the label. When selecting anodized aluminum, in addition to the need for reasonable selection, it is necessary to pay attention to quality inspection and control when purchasing.
When inspecting the appearance quality of anodized aluminum, it is mainly observed whether the product specifications, model, color, grade and shelf life meet the requirements. See if the surface of the electrochemical aluminum has scratches, blisters, abnormal colors, surface damage, wrinkles, and unevenness. And whether the brightness is balanced. In addition, it should also check whether the primer film layer is uniformly coated, whether the texture is smooth, whether there are impurities, whether there are obvious streaks, whether it is oxidized or not.
When detecting the transfer performance of anodized aluminum, it can be evenly pasted on the back side of the anodized aluminum with a transparent tape to a length of about 1 cm, while the tape is slightly pressed to make the tape adhere to the anodized aluminum, and then the separation force is used to uncover the tape. If the large area of ​​the electrochemical aluminum layer is transferred to the tape, it indicates that the transferability of the electrochemical aluminum is basically in accordance with the hot stamping requirements.
For the quality inspection of quantifiable indicators of anodized aluminum, it is recommended to refer to the BB/T0031—2006 “Electrified Aluminum Hot Stamping Foil†standard, which specifies the number of blisters, yellow spot length, mechanical scratch length, color difference, and gloss of anodized aluminum. There are clear requirements for the degree and the sharpness of hot stamping and the wear resistance of the hot stamping layer. When sampling according to the standard, a roll of anodized aluminum is cut at an effective length of 2 meters for the detection of all quality indicators. If there is one indicator for each batch of products that is unqualified, it should be doubled and re-examined. If the re-inspection is still unqualified, it is judged that the quality of the batch of products is unqualified.
In actual production, due to the lack of testing equipment, it is often difficult for label companies to effectively detect each indicator. At this time, the quality status can be effectively verified in accordance with the production status. For example, when detecting the gloss of anodized aluminum, as long as the hot stamping temperature is within the normal range, the color of the anodized aluminum is basically unchanged; when detecting the sharpness of the hot stamping, as long as the pressure used in the hot stamping process is appropriate, the stroke of the text layout is appropriate. It is clear that there is no adhesion, paste or lack of pen break, and it can be judged that the electrochemical aluminum material is qualified.
When the purchase volume of electrified aluminum is large, it is recommended that the label company should reach an agreement with the supplier. On the basis of the reference standard, the quality control should be applied to the quality acceptance method that is more practical and practical, to ensure the quality of hot stamping. .
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