Development and Application of Hot Pad Printing Technology and Precautions

Hot pad printing technology commonly known as hot stamping, the early hot stamping industry in the print is not much, the reason can be summarized in two points: First, the hot stamping machine is still on the small machine in the 1970s, such as manual hot stamping machine, 13-inch × 18 inch Heidelberger throat machines, and smaller flattened flattening stamping machines. At that time, if there was a large area or bronzing in the field, they could not be hot-pressed. There were multiple versions of the paper and a large amount of paper to be quasi-adjusted. Also, the large paper was finely sliced ​​before it could be gilded, resulting in slow bronzing and slow positioning. , to the printer troubled. At that time, most of them were hot stamped hardcover cases, book covers, covers, envelopes, letterheads, greeting cards, etc., and hot box printing was not popular. The second reason is that due to the fact that hot stamping is not popular, it was not promoted until the early 1980s when local companies introduced large-scale hot stamping machines in Japan, such as escaping machines. After the promotion, the printing merchants can see the hot stamping full sheet, the nesting is accurate, and the goods are fast, so they have the ability to receive the hot stamping of large area orders; and even more fully introduce the Heidelberg hot stamping machine to make the hot stamping industry more flourishing. Until now, the demand for bronzing of printing and packaging has increased.

Hot stamping machinery

In fact, bronzing seems simple, but it has its own learning. The bronzing industry can be briefly divided into paper stamping and plastic stamping. The machinery in the two types of industries is also different. Paper gilding machinery can be roughly divided into:

First, the manual small hot stamping machine can only be hot-stamped paper with smaller size.

Second, the flat pressing hot stamping machine, this model has a variety of sizes, from small to hot enough to open the size of the paper, with a computer program to pull the gold foil, the speed is slow, the process mostly manual operation.

Third, manual type beer box type hot stamping machine, this type of machine is similar to manual beer box machine, the size can be hot stamped to 28 inch × 40 inch paper, the process is also mostly manual operation, the speed is relatively slow, rarely used in Hong Kong.

Fourth, Heidelberg automatic rolling gilding machine, Heidelberg letterpress printing machine can be said to be the oldest top machine. This hot stamping machine was actually refitted from a letterpress machine. Now that letterpress printing has been replaced by offset printing, the machine factory has used its brains to convert it into a fully automatic hot stamping machine. This is mainly to convert part of the dial into heat. The board and the place where the bronzing plate is installed, and a gold-recovery paper component is installed. This machine has a good effect on hot lines and large fields.

Fifth, flat automatic hot stamping machine, nearly automatic beer box machine, the price is more expensive, not many users, but the speed is the fastest model, hot stamping area is also larger.

Sixth, automatic air throat hot stamping machine, modified by Heidelberg live version of the wind throat machine, paper size of 13 inches × 18 inches, fast, is the most important tool for the early gilding of the fortune.

Gold foil needs to match materials

In addition to the hot stamping machine, there must also be the cooperation of hot stamping foils. The hot stamping foils may seem thin. In fact, it consists of five layers of materials.

Many people have misunderstood that a kind of gold foil can be used to iron any kind of paper products. In fact, many kinds of gold foil are used to match different types of hot materials, such as PP film or polished paper products, metallic ink, cloth, PVC glue, etc. Hot and thin line stripe or large field and other materials and printed materials, must choose different materials of hot gold foil to cooperate. Therefore, the price of flashing hot stamping foils ranges from RMB 10 to RMB 1,000. It also depends on the origin and the nature of the materials. The price of matte color ironing fabrics and scratchable gold foils is about 700, and that of laser gold foils is over 1000. yuan. Gold foil manufacturers have manufactured 10 kinds of gold foils of different colors and different qualities to suit different paper products. On a scale, a well-managed hot stamping factory also makes samples of hot stamped gold foils and additional numbers for customers' selection. Customers can also designate a brand. Gold-foil foils, such as international toy makers "Barbie" dolls will specify a certain brand, a certain number of gold foil.

Apply different media

Followed by the hot stamping model, commonly known as the electric version, the electric version was commonly used in Hong Kong, and has a long history, in the early printing of the so-called font size, this is used for letterpress printing, after the hot stamping industry, later letterpress printing With the electric version (ZINC zinc is used as a plate material), the bronzing industry has also followed its use. In recent years, Hong Kong has also begun to use the magnesium version (Magnesium magnesium as the plate material). The magnesium plate has a variety of thicknesses, and the thicker ones can be etched (Photeched) and deeper. They are used for hot stencils, patterning or impact/striking. (embossing/debossing), the effect will be better, and because it is more durable, the large number of hot stamping does not have to be changed frequently. Another copper alloy (copper alloy) as a plate material, because the hardness is stronger than zinc, magnesium, can retain a better image level, high-definition, reduce the sand surface of the molding material, embossing millions of stone can also be done. The above materials made of zinc, magnesium and copper alloys are suitable for single-layer hot stamping and punching. (single level, beveled engraving).

There is also a brass plate (composed of copper, tint and lead) with a thickness of about 7mm. It has a low hardness and can be carved. It is suitable for hand-carving and motor engraving. It is regarded as an engraving plate with distinct layers and is multi-layered. Multi-level, sculptured engraving for special beveled engraving, can be used for punching/debossing, embossing, three-dimensional embossing, or one-time hot stamping with convex/concave, also due to the complicated manufacturing process. The price is very expensive, and depends on the complex requirements of the graphic to determine the price, and the copper plate needs to be carved in foreign countries, compared to the manufacturers can do.

Bronzing attention to temperature pressure

If the bronzing effect is good, it is necessary to have a suitable gold foil with good thermal stability, and it is also necessary to cooperate with the bronzing machine type, such as flat pressing and rolling type, which have different effects, and the matching temperature, pressure, and hot pressing pressure. Elements of time.

Temperature - The most suitable temperature for bronzing operations is the ability to imprint a clear texture at the lowest possible level. The platen stamping machine has a heating plate temperature of about 110°C, and a roll-type stamping machine has a temperature of 140°C to 150°C. The most suitable temperature is to be found in the test mode. Excessive temperatures will change the foil stamping paper. Bad and blurred lines.

The pressure-pressure depends on the hardness of the material and the texture of the surface. Surface smooth or soft material, lighter pressure, rough or hard, it can be heavier pressure. The flat pressing hot stamping machine is the synchronous hot pressing of the whole sheet. The hot line of the hot rod machine is the line pressure and then the flat pressure. The rolling machine is similar to the line pressure of the Koo machine.

Stoppage time - based on the shortest possible effect of hot stamping, the time is too long, the gold foil and the hot stamped paper are damaged, and the flash foil will become a matte foil.

There are also patterns to be hot stamping and printing pattern sets are accurate, when using a rolling hot stamping machine or a large area of ​​hot stamping, there is a need to foil the negative film film first reduced to 99.8% to 99.7%, before the arrangement of electricity Edition, so that the electric version is heated and swelled on the heating plate. It turns out that the current scratch-off raffle tickets can also be made using the bronzing method.

The price of bronzing depends on which type of gold foil is used, whether gold foil is wasted, the degree of closure, type of layout, quantity, size, and so on. Therefore, there is no standard calculation method for uniform quotation.

3 questions to note:

First, in the case of hot-printing cloth husks, although it has been pressed deeply, hot-foil foils are easily detached.

Second, the printed matter that has passed UV is not hot on gold foil.

Thirdly, many kinds of gold foils are tested and stamped on black prints (such as printed cardboards, thin papers, dyed black or primary colored leatherettes, and hot black foils, all in very short time. For 3 or 4 days or for a longer period of time (3 to 4 months), the shadows will gradually appear, and as time goes by, the more they appear, (the gold foil agents say that they are related to printing ink carbon molecules, so they cannot Guarantee that gold foil will not change with the print).