Hot stamping process of cork paper

In recent years, the continuous introduction of high-grade cigarettes has made the application of hot stamp printing more and more widely, with an upward trend, such as the blue hard and soft Lotus products of Hunan Changde Cigarette Factory, the Red Dragons and Yellow Crane Towers of Wuhan Cigarette Factory. Products, Changsha cigarette factory black and series products.

Compared with the hot stamping process of cigarette packs, the hot stamping process of the cork paper is more difficult in some aspects. The tipping paper is a reel type material, and most of them adopt a round press hot stamping method, which has an overall hot stamping and a single hot stamping. Hot stamping equipment is mainly made in domestic equipment, such as Zhejiang Haining Tengda, Ruian powerful, Xi'an black cattle equipment, but also imported equipment, typical of France Shangbang. The heating method uses electricity or oil heating. The bronzing roller is an integral version, which cannot be used as a local version of cigarette packs. The base material is copper and steel (copper has good thermal conductivity and steel has high resistance to printing).

Due to the low quantification of tipping paper products, it is generally around 40g/m2. Therefore, the temperature and humidity of the workshop are required to be higher. It is better to maintain the constant temperature and humidity, and the hardness and material of the impression cylinder are also high. Claim. In the corrugated paper hot stamping process, the factors that affect the product quality mainly include the following aspects.

Cork paper

1. Effect of anodized aluminum

In the hot stamping process of corrugated paper products, the quality of anodized aluminum is closely related to the quality of hot stamping. If the tightness of the anodized aluminum is improper (too loose and too tight) will cause the hot stamping is not true; Improper temperature of the hot melt adhesive will cause a hot stamp paste; production time of the anodized aluminum is too long or too short, the tension is too large or Too small, inaccurate hue, or instability can directly affect product quality. Taizhou, Zhejiang, Wenzhou Yushi, Guangdong Sihui Sun and other companies produced the corrugated paper hot stamping aluminum quality is relatively stable. To some extent, grasping the quality of anodized aluminum is equivalent to controlling half the quality of the product.

2. Influence of the hot materials

The impact of the hot-ironed materials on the hot stamping quality of the water pine paper products is mainly reflected in the ink layer on the surface of the hot-lining material. If the white ink used as the diluting agent in the ink is added in excess, the electric aluminum will be pulled back, causing the hot stamping to be false. In addition, the temperature resistance and thickness of the ink layer will also affect the quality of the stamping product, especially when printing with pearlescent ink.

3. Effect of hot stamping speed

Hot stamping speed is too slow, hot stamping is mostly not clear (except for products with special requirements), with the increase of speed, the performance of aluminum and hot stamping temperature, hot stamping pressure to achieve the best state, the product of the pattern, text, The lines become clear. The speed of most tassel paper hot stamping is appropriate at about 40 m/min, and should be adjusted depending on the complexity of the pattern, the size of the text, and the thickness of the lines.

4. Effect of hot stamping temperature

The level of hot stamping temperature plays a key role in product quality. Hot stamping temperature is too high, which can easily cause pattern blooming. If the temperature is too low, hot stamping is not easy. The use of oil or electric heating method, the choice of copper or steel as the substrate of the bronzing plate is also very different in temperature control, generally equipped with a temperature detector, mainly used to detect the actual temperature of the bronzing plate surface.

5. Influence of hot stamping pressure

Hot stamping pressure mainly refers to the pressure of the rubber pressure roller on the hot stamping plate. It also plays a very important role in the hot stamping of tipping paper. If the pressure is too small, the hot stamping will not be caused, and the paste will be generated after the convention, and the service life of the tipping and hot stamping version of the tipping paper product may be shortened. When setting the pressure, it should be gradually increased from small to large.

With the development of hot stamping technology, it is believed that the cold stamping and hot stamping techniques used on cigarette packs will also be applied to tipping paper. For the corrugated paper hot stamping production enterprises, they should keep abreast of the development of cigarette packs, and reposition themselves (like Zhejiang Lida Packaging Materials Co., Ltd., making stamping stamps its own competitive product) so as to remain undefeated in the future competition. place.

Reprinted from: "Printing Technology"