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Sticker hot stamping

2021-05-02

1. Hot stamping method

According to the processing method of self-adhesive labels, the bronzing method is divided into sheet-fed bronzing and web bronzing. The sheet-fed bronzing process is the same as the traditional bronzing process and is processed on a special gilding machine. Web bronzing is accomplished on the label linkage mechanism and is the most widely used processing method. At present, there are several ways to roll foil material:
1 label machine flat press flat hot stamping

No matter whether it is a flat press or a round press-type device, the letterpress label printing press adopts a flat press mode because the paper is fed intermittently. In general, the stamping station is an independent unit, and there are also some models of bronzing that share one unit for die-cutting and are used separately.

2 multi-station flat press hot stamping

Some models have a hot stamping unit with two stations, such as Shiki's SMHC-45-MWL labeler. One unit is close to the printing plate to complete horizontal bronzing, and the other is a stand-alone unit to complete vertical bronzing. The model can be double-colored at the same time.

3 flat press on the processing machine

The processing machine is designed to process printed roll labels and labels that do not need to be printed. Hot foil stamping is a function of the processing machine. The hot stamping device on the processing machine generally adopts the flat pressing method. Its working principle is the same as the above labeling machine.

4 rounds on the rotary press

The bronzing plate used for round press bronzing is in the form of a roll, and it is in contact with the embossing roll when it is bronzing to achieve bronzing. Round round hot stamping is suitable for use on continuous transfer paper label converting machines, but it has certain requirements on the paper feed speed, that is to say it has an impact on the printing speed. However, compared to the flat bronzing, the efficiency has been greatly improved. Round press hot stamping roll is expensive to manufacture, so it is only suitable for long live stamping.

5 turn cold stamping machine

This is a new technique for bronzing. Instead of using heated metal plates, it uses printing adhesives to transfer metal foils to achieve bronzing. The process flow is: First, the UV-sensitive adhesive is printed on the location where the printed product needs to be gilded, the adhesive is dried by the UV drying device, and then the special metal foil is used to compound the pressure-sensitive adhesive, and then the metal foil is peeled off. Thus, the metal The part of the foil that needs to be transferred is transferred to the surface of the print to achieve cold stamping. The cold bronzing process is low in cost, saves energy, and has high production efficiency. It can utilize existing equipment components without adding additional devices. It is a promising new process.

2. First hot stamping and hot stamping

Self-adhesive bronzing is also divided into bronzing and bronzing. First gilding refers to bronzing on the labeling machine and then printing; then bronzing refers to printing first, and then bronzing. The key to bronzing and post-bronzing is the drying of the ink. There are two situations in the relationship between bronzing patterns and printed patterns: juxtaposition and overprinting. Because of the different inks used, the labels must be printed using the first and second hot stamping processes respectively.

1 first hot stamping process

When the label machine installed with the intermittent paper-feeding stamping unit uses ordinary ink to print the label, the first stamping process is used. Since the used ink is an oxidative polymerization-drying type, the ink layer after printing needs a certain time to be completely dried, so the hot stamping is performed. Pattern must avoid ink. The best way to avoid ink is to pre-foil the roll material before printing.

The use of the first bronzing process requires that the printing pattern and the bronzing pattern be separated (side by side) because the surface of the galvanized aluminum is smooth, free from ink, and cannot be printed. The first hot stamping can prevent the ink from getting dirty and ensure the label printing quality.

After 2 hot stamping process

After the bronzing process is applied to the labeling machine where the bronzing components are mounted on the back door, the printing uses UV ink. The web material is printed first, and the ink is instantaneously dried by a UV drying device, and then gilded on the surface of the ink or the ink surface after the ink is dried. Since the ink is dry, the hot stamping pattern and the printed pattern can be either side-by-side or overprinting, and no ink pick-up will occur.

Two kinds of gilding methods are ideal methods for post-bronzing, which also brings convenience to the label pattern design and expands the application scope of hot stamp patterns. However, due to the limitation of the function of the device, the cost of label printing is relatively high. The first bronzing process is suitable for the processing of small labels with simple patterns. The low cost and wide range of applications are commonly used by small and medium sized printing plants.

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