Talking about the printing of paper towels
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As a printing method that meets the future environmental protection requirements, flexographic printing has become more and more widely used in packaging in recent years, such as labels, folding cartons, flexible packaging and cartons. But when it comes to the application of flexographic printing in the series of paper towels, it is still little known in China. There are two main reasons: First, the domestic flexographic printing process starts later than foreign countries, and there is still a lot of market promotion and equipment use. The gap is the difference in consumer culture. Paper towels are a wide-ranging and artistically interesting design theme in the West. Beautifully printed napkins can be used on different occasions, such as the fairy tale series launched by Christmas and Children's Day. It's also an affordable form of personalized advertising, which is common in restaurants or hotels. As people's lifestyles become more and more personalized and fashionable, personalized paper towels have become a trend and trend nowadays. Specially designed paper towels are often used on special anniversaries such as weddings, banquets or company annual meetings. Paper towel printing has grown quite fast in the past few years.
At present, the main people in the Chinese market are the monochrome printing paper towels used by McDonald's and KFC. The patterns are relatively simple. However, we have also noticed that in the fashion-oriented large supermarkets like IKEA, color napkins imported from Europe have begun to be prominently displayed. The price is much more expensive than pure white products. Obviously, printing gives paper towels more products. High added value. For printing, this also means a new point of profit growth, which deserves everyone's attention.
Paper towel material
In the printing of tissue paper, the choice of tissue material is crucial, and it is also one of the basic elements to ensure the smooth progress of printing. Compared with other packaging materials, paper towel materials are characterized by very thin, soft, absorbent, poor tensile strength and easy to stretch. Therefore, tissue products generally pay attention to the matching of bright colors, but do not overemphasize the subtle levels and tones. Restore reproduction. In addition, the content of cotton or fiber in the paper towel product is high, it is easy to seep, and there is much paper dust. For folding paper towels, there are also single layer and multi-layer materials. For multi-layer materials, it is necessary to pay attention to the problem of layer separation, because at high speed (such as 700m/min), the paper towel material has not been embossed. All levels must be guaranteed to be tightly coupled, otherwise it will cause paper jams during printing and cause downtime. In addition, during printing, the ink may cause the surface material to expand. If the bonding between the layers is not tight, the material may wrinkle, affecting the printing effect or even causing waste, and increasing material waste. Therefore, in order to ensure the quality of printed products, reduce waste, and improve production efficiency, we must choose a good quality tissue material.
Printing ink
For napkin products, it is very important to be in direct contact with the human body, such as the mouth, hands or eyes, and food. Hygiene and environmental protection are very important. At present, the water-based ink used in the paper towel flexo printing machine is environmentally friendly, non-polluting and odor-free, and fully meets the requirements of hygiene and environmental protection. In addition, when many consumers in China talk about colored napkins, they will undoubtedly raise the doubt that when using such colorful paper towels, the printed ink will not stain the skin or pollute the surrounding environment. In fact, this kind of worry is not necessary. The paper towel printing factory has fully considered these factors when selecting inks. In particular, the abrasion resistance, water resistance and tamper resistance of the ink are very important technical indicators, and the ink used for paper towel printing. After repeated skin contact test and abrasion resistance, anti-caries test, especially in the home life, there may be many substances that are easy to induce ink seepage. Therefore, compared with ordinary water-based inks, the formula of paper towel printing ink is also The addition of certain ingredients can effectively prevent the ink printed on the paper towel from seeping or dissolving when it comes into contact with water or strong alkaline substances.
The printing suitability of paper towel printing ink is also very important. In the printing process, the pH value, viscosity and other properties must be kept stable, and the drying property is suitable, which is consistent with the printing speed and post-printing processing requirements. Paper towel flexo presses can print at speeds up to 700m/min or 10000 sheets / min, in the high-speed printing and high-speed folding process, the stability of ink performance is very important, the viscosity of the ink may be broken, the drying may be too slow to meet the requirements of high-speed production; if it is too fast, it will lead to dirty .
Printing Equipment
The paper towel flexo press is designed in a stacked or satellite configuration, and the complete machine includes unwinding, printing and wire processing. From the beginning of unwinding, through the printing, folding, embossing, fragrance addition, counting to the finished paper towel, the entire process is fully automated. Flexographic printing equipment uses a modular design that is highly flexible in configuration. The number of units, including printing units, can be increased or decreased, and the printer can tailor it to the needs of its business.
The paper towel flexo printing machine is characterized by high speed and high output. Take the paper towel flexo printing machine produced by Omit, for example, the format is 500~2740mm, printing speed can reach 600 ~ 700m / min; printing unit can be configured up to 8 color groups; in the paper exit part, according to the size of the output, there are several paper, double paper path or even 8 paper roads, etc. Ways to choose from.
In the printing process of paper towels, due to the particularity of the tissue material, the control of printing tension is one of the key factors affecting the quality of printed products. Many high-end flexographic printing equipments have adopted shaftless drive technology, with independent DC motor control in each unit of unwinding, printing, embossing, folding, etc., and digitally controlled multiple floating rollers and paper-feeding rollers, making the equipment The tension control and register control effects have been greatly improved. Secondly, the drying performance of the equipment is also very important. The paper towel flexo printing machine adopts infrared, hot air or a combination of the two, and is equipped with a water-cooled roller solution, so that it can achieve better drying effect and meet the requirements of the product.
However, there is still such a problem in the printing of paper towels. Because the paper towel material itself has a lot of paper hair, the surface strength is poor, it is easy to fall off the powder, and the hair is lost, sticking to the printing plate and gradually accumulating, which will result in dirty plates and blocking. Stop cleaning. In response to this annoying problem, many manufacturers have installed vacuum cleaners in the printing unit to solve them, or with special squeegees to reduce the incidence of such problems. Omit's use of a wheel press, a closed double knives, and a vacuum cleaner virtually eliminates this phenomenon, while Omit offers a non-stop cleaning plate that reduces downtime. ,Increase productivity.
Post-processing is an important part of paper towel flexo printing. Taking folding paper towels as an example, the folding of paper towels is very particular. It requires four sides to be square and has sharp edges and corners. In this process, tension control is especially important. The folding of paper towels is flexible.
Embossing is also an important part of the production process of paper towels. Embossing can improve the softness and moisture absorption of paper towels, and the uneven pattern of different patterns also adds beautiful effects. There are many ways to emboss, such as point to point, steel to steel, steel to paper, steel to rubber, etc., can also be divided into partial embossing and all embossing.
The strong development of paper towel flexo printing has attracted people's attention. The US FTA report stated that although the official statistics on the North American flexographic printing market in 2002 have not been included in the data part of the flexographic printing paper business, Paper towel printing, which accounts for 5% to 8% of its members, represents a new and powerful profit growth space, which has attracted attention in the North American flexographic printing industry, which has been in the doldrums. Many paper towel flexo printing companies are full of confidence in the current and future tissue printing market. Statistics show that in 2005, the tissue and napkin printing business will grow steadily by 3% to 5% per year.
These market dynamics can be used as a reference for domestic manufacturers engaged in the flexographic printing industry and those who intend to invest in flexographic printing. Together, the flexographic printing market will be bigger and stronger, and will gain wider development space.