In Feb, HOTSALES, Dubai customer order 500pcs zinc plates.

In Feb, HOTSALES, 500pcs zinc plates are packed for delivering to our customer in Dubai. High quality zinc plates with good packing.

Hot stamping - as one of the commonly used post-print finishing processes for labels, it can increase the texture and aesthetics of the label, and ultimately achieve the purpose of increasing the added value of the product. However, in the actual production process, due to the unclear understanding of the suitability of hot stamping plates and equipment, it is prone to hot stamping quality defects. Below, we will interpret this process from two perspectives: analysis of hot stamping suitability and technical control and the main points of preventing hot stamping quality defects.

Hot stamping suitability analysis and technical control

1. Characteristics analysis of hot stamping plates

Zinc plate is the most traditional hot stamping plate, and it is also the cheapest hot stamping plate. Zinc plate is made by corrosion process, the process is cumbersome and the plate making time is long, and it often needs to reach a certain batch before it is suitable for opening the plate. Because the edge of the hot stamping pattern on the zinc plate has a certain slope, the layout is prone to quality defects such as pitting and poor gloss. Therefore, it is generally suitable for hot stamping of small-area line layouts, and is a commonly used hot stamping plate for middle and low-grade labels.

The copper plate is usually made by computer engraving, and the plate-making precision is high and the plate-making speed is fast. The copper plate has a smooth surface, high wear resistance, and fast heat transfer. The edge of the hot stamping pattern has almost no slope, and it is not easy to cause dirty and paste problems. The hot stamping quality is better than that of the zinc version. . However, the copper plate material is relatively expensive, and the production cost is significantly higher than that of the zinc plate.

Magnesium alloy plate is also an ideal hot plate for hot stamping high-quality labels, usually made by etching plate-making process, and plate-making speed is fast. The magnesium alloy plate has a neat slope, good continuity, smooth edges, high surface hardness, small specific gravity, light weight, and fast heat conduction, heat transfer and heat dissipation. Due to the delicate material of the magnesium alloy plate, the heat transfer effect is better than that of the zinc plate and the copper plate, and almost no deformation occurs during the hot stamping process. The hot stamping speed of the magnesium alloy plate is faster than that of the copper plate and the zinc plate, and the printing endurance is about 20% higher than that of the copper plate.

It is recommended that enterprises select the appropriate type of hot stamping plate material according to the production process characteristics and quality requirements of the label, and then select the hot stamping plate of the corresponding thickness according to the characteristics of the hot stamping equipment and layout, so as to take into account production efficiency, quality and cost.

2. Suitability analysis of hot stamping equipment

The hot stamping equipment is divided into three structures: flat flat, circular flat and circular flat, and these three models have their own characteristics and technological advantages.

The hot-stamping machine with the vertical flat-pressing structure is the most commonly used hot-stamping equipment, and its main features are convenient and fast operation. Flat-pressing hot-stamping equipment runs slowly and is more suitable for short orders. If hot-stamping orders with large batches, the efficiency will be greatly limited. In addition, due to the surface-to-surface contact between the hot stamping layout and the printed sheet, the required working pressure is large, but the pressure is relatively dispersed, and the uniformity is also restricted to a certain extent, so it is not conducive to the complete transfer of the anodized aluminum layer, especially for hot stamping. When large-area patterns are used, the quality and effect are not as good as the round flattening and round pressing models.

The hot stamping equipment with circular flattening structure adopts automatic paper feeding, the hot stamping speed is obviously faster than that of the flat pressing machine, and the hot stamping efficiency and quality are also higher. Due to the contact between the line and the surface during hot stamping, the pressure is relatively concentrated, the working pressure is relatively small, and the pressure in the hot stamping area is easy to be uniform, so it is more suitable for label orders with large batches, large areas and high hot stamping accuracy.

The hot stamping equipment with the round-pressing structure has a high degree of automation and the best hot-stamping quality. Because the hot stamping plate cylinder and the impression cylinder are in line-to-line contact, the working pressure is small, the pressure is most likely to be concentrated, and a uniform hot stamping effect can be obtained. It is an ideal choice to achieve high-quality hot stamping.

3. Hot stamping process control

Hot stamping process control is mainly to control the hot stamping pressure and temperature. If the surface smoothness of the label material is not good or the background ink layer is thick, the hot stamping pressure applied is relatively slightly larger; for the hot stamping layout with large-area patterns and text or small lines coexisting, more Pad a layer of paper of appropriate thickness, so that the text or small lines are not easy to smear; if the imprint is not dry or the background ink layer is thick, in order to avoid the hot stamping pattern, the lamination delay can be 1 to 2 seconds , in order to prolong the transfer and adhesion time of anodized aluminum, and improve the quality and effect of hot stamping.

The reasonable adjustment of the hot stamping temperature is also an important part. It should be comprehensively considered and adjusted according to factors such as the ambient temperature, the hot stamping material, the characteristics of the hot stamping plate, the size of the hot stamping area, the hot stamping speed, and the structure of the hot stamping equipment. Mastering the appropriate hot stamping temperature requires operators to carefully observe, analyze and record relevant process data in the production process, so as to accurately summarize and adjust the best hot stamping process parameters and ensure the hot stamping quality of label products. .

The main points of preventing the quality defects of hot stamping

The hot stamping layout of many label products is designed on the basis of the printing background color. Therefore, the quality of the printing ink will directly affect the hot stamping quality. This requires that the fineness of the ink used in the printing base color should be high, and the degree of curing and the thickness of the ink layer should be appropriate to ensure that the ink layer is evenly coated and adhered firmly. In addition, it is necessary to avoid adding excessive brighteners, diluents, detackifiers, desiccants, etc. to the ink, so as to avoid hot stamping, hot stamping, poor adhesion of anodized aluminum, and easy to tear off the ink during the hot stamping process. Layers and other quality defects.

When hot stamping on the base color of the spot color ink, it is better to adjust the hue of the base color ink to be a little darker, so that the printing ink layer is relatively thinner, which can not only meet the requirements of the printing hue, but also make the printing ink layer solidify. It is sufficient and firmly attached to the substrate, which is conducive to achieving good hot stamping quality and effect.

Furthermore, it is also necessary to pay attention to the selection of inks with good tinting strength and temperature resistance for printing, and try not to use or use less powder during the printing process. At the same time, the printing pressure is slightly larger, which can avoid the floating ink phenomenon caused by the large amount of ink coating.

To sum up, as long as we pay attention to the quality control and control from layout design, material selection, equipment selection to production process, we can effectively avoid the disadvantages of hot stamping, better ensure the hot stamping quality of labels, and meet the quality of customers. Require.