The most popular domestic gravure plastic ink appl

2022-07-31
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Analysis on the current situation of the application of Gravure plastic ink in China and the reasons for its limited development

current situation: hovering between hot and cold

95% of flexographic printing and 80% of gravure printing in the United States use water-based ink, 40% of plastic film printing uses water-based ink, and other developed countries, such as Japan, Germany and France, also increasingly use water-based ink in plastic film printing. The United Kingdom also legislated in june2003, It is forbidden to use solvent based ink to print films for food packaging

with the rapid development of China's economy, people's packaging aesthetic awareness and environmental protection awareness are constantly improving. The introduction of relevant national policies and the specific environmental protection requirements of international enterprises for export orders have become positive factors to promote the development and application of water-based inks in China. Some universities in China began to cooperate with enterprises in the research and development of Gravure plastic ink since the 1990s. In 1996, Zhuhai Ruilong Ink Co., Ltd. began to work with Sun Yat sen University to develop Gravure plastic ink. In 2000, the "water-based plastic gravure printing ink for food packaging" was approved by Guangdong Provincial Department of science and technology, and passed the achievement appraisal. The product filled the domestic gap, its achievements were at the leading level in China, and won the Guangdong Provincial Science and technology progress award. It is recommended as an environmental protection packaging product by the green packaging branch of the Chinese society of Environmental Sciences. In 2000, Ruilong stopped the production of solvent based inks, transformed into a professional ink manufacturer, and began to develop, produce and sell Gravure plastic ink

at present, there are many enterprises producing ink in China, and the annual sales increase by 30%. But for a long time, the vast majority of ink has been used in cartons or flexographic printing. Until the last two years, there has been a certain increase in the application of plastic film. According to relevant sources, some domestic enterprises that receive export orders have begun to use Gravure plastic ink. In recent years, due to the problem of drying, there has been little progress in the application of Gravure plastic ink. Although it has been reported that the development of water-based plastic ink has been successful, it is only in the trial production stage or under special application conditions, which is still a long way from industrialized production

although the use of flexographic ink in European and American countries has reached 40%, there is no data to show that Gravure plastic ink has been industrialized in large quantities. Plastic ink is widely used in Europe and the United States, and the technology has been mature, almost all of which are used in flexo printing machines. Since our country's flexible packaging printing products have been imitating Japan, the recognized gravure printing qualified products must be precise registration, fine points, rich layers and bright colors, so the printing machines are basically gravure printing machines. Everyone's printing effect standards are based on the effect of gravure printing, while the effect of flexographic printing is generally not recognized by domestic packaging users

according to our investigation, most well-known upholstery enterprises now use alcohol soluble ink in printing, and some companies only apply a small amount of water-based ink to the packaging of medical devices. Some enterprises said that this is mainly related to the packaging safety requirements of European and American countries for domestic export products. They generally require the use of alcohol soluble inks. At present, domestic ink is mainly used in flexo printing and carton printing, and the application of plastic film has not been launched. After the trial, some customers said that the trial effect of Gravure plastic ink was not satisfactory, because the success of the application was not only the problem of ink, but also related to the practical problems of equipment, substrate and other aspects

in ink manufacturing enterprises, the development and production of ink can be divided into hot and cold. The survey shows that most domestic ink enterprises are only in the R & D stage for ink, and have not yet produced and sold Gravure plastic ink. The main reason is that there is less market demand, and some specific problems such as printing equipment have not been solved, forming some practical application barriers. Some well-known ink manufacturers in Guangdong, such as Yeshi, Toyo and Letong, have just entered the R & D stage. At present, it is still the "golden age" of benzene soluble inks. The major ink enterprises basically focus on the production and sales of solvent inks. They mainly focus on controlling the content of benzene, take meeting the national requirements as the main benchmark for R & D and production, and also focus on alcohol soluble inks in the production of environmental friendly inks. Some enterprises even said that alcohol soluble inks have not been popularized yet, not to mention water-soluble inks

$page break $reason: there is no power without pressure

why do printing enterprises not care or even "stay away" from Gravure plastic ink recommended by ink manufacturers

to sum up, there are mainly the following reasons:

first, the reasons for the ink itself.

professor makancheng, deputy dean of the school of chemical engineering, Sun Yat sen University, said: "these problems have not been really solved, which should be the reason for the slow promotion of Gravure plastic ink."

some enterprises think: "printing a little sample may be very good, but once mass production, there will be many unexpected problems."

the printing performance and quality of both imported and domestic water-based inks can not meet the standards of solvent based intaglio inks. At present, water-based inks are generally not resistant to alkali, ethanol and water, slow drying, poor gloss, and easy to cause paper shrinkage. This is mainly due to the high surface tension of water (72dyn/cm), which makes the ink difficult to wet and slow to dry. It is difficult for water ink to be well wetted on polyethylene and other substrates and the long printing drying time are the key problems for the application of water ink. Unless the printing machine is equipped with sufficient drying equipment, the printing speed will be affected; The gloss of ink is lower than that of solvent based ink, which greatly limits the use of ink in occasions with high gloss requirements

in the survey, many ink enterprises said that the reason why they did not produce was not only the market, but also the technology. Some technical problems have not been solved internationally. They are skeptical of some enterprises that claim to have solved all the technical problems. Solvent ink has been developed in China and even Asia for many years. It is very mature in technology. Its printability and other aspects of performance are "very good", which is its biggest advantage

on the whole, the important reason why Gravure plastic ink has not been popularized further is that it is still unable to compare with solvent based gravure ink in terms of printing suitability and printing speed. Now benzene ink can also increase the air volume when printing and drying, and the machine speed can be opened to 200m/min. The Gravure plastic ink can only reach 50 ~ 80m/min in the actual printing process

although many ink manufacturers often say their products are perfect for understandable reasons when promoting ink, when we hope that the other party can provide corresponding successful application cases, ink enterprises often say that they cannot provide them for various reasons. Inspection and application are the last word. This journal learned from the communication with front-line management and production personnel of some well-known printing enterprises that they have tried plastic ink, but the effect is always unsatisfactory. Some well-known ink manufacturers engaged in research and development also said that not all plastic substrates are suitable for using ink. Because of their molecular structure, substrates such as nylon are prone to problems when drying. The drying capacity of ink is the biggest problem, which directly affects the equipment adaptation of printing enterprises, and the resulting transfer of printing and printing speed will be affected. The rust and corrosion prevention of equipment should also be followed up accordingly

the use of ink must bring benefits to printing enterprises before it can be promoted. However, the actual situation is that there are many problems in the product quality and process of Gravure plastic ink. When this product does not bring any benefits to the printing enterprise in terms of cost and product quality, the printing enterprise has the right to refuse to use it. They believe that ink factories must really think from the perspective of printing enterprises when promoting

gravure printing started late in China, but it has developed rapidly and the technical level has been greatly improved. At present, most of the printing equipment imported by flexible packaging printing enterprises come from Japan, and the development of gravure printing ink also refers to Japanese technology. Since Japan has successively formulated various laws and regulations on gravure printing industry, the printing and ink industry has also been adjusted to meet its requirements. These environmental protection restrictions first require the ink to change the status quo and gradually develop towards environmental protection. After the implementation of PRTR method in 2001, toluene based ink gradually transited to toluene free ink. Up to now, toluene free ink has occupied a dominant position, and the final trend towards environmental protection must be the development of water-based ink. At present, it is convenient to convert toluene based ink to toluene free ink, which is easy to popularize. However, the development of water-based ink has the characteristics of energy saving, safety, non destruction of the ozone layer and extremely low global warming potential. There are many factors limiting the development of these products. At present, the printing equipment, plate making and film are designed and developed according to the use requirements of solvent based ink, and a lot of basic development work is required to realize the printing transformation

at present, printing enterprises pay most attention to the performance of Gravure plastic ink mainly in the following aspects:

1, adhesion

2, dryness

3, gloss

4, bubble problems

others: the quality of printing products; Ease of use; Printing speed, equipment transformation cost; The corrosion of ink on mechanical equipment and other related issues

$page break $2. The reason for setting the pointer to zero is that the equipment can't keep up with it now, and it's useless for us to spend more effort on promotion

quite a number of ink manufacturers said that the difficulty in the promotion of ink now is not the problem of ink itself, but more the problem outside of ink

drying has always been regarded as the biggest obstacle to the application of ink, which is closely related to the drying equipment of the printing press. The key point of the transformation of the equipment manufacturer is to strengthen the drying capacity of the drying channel. Among them, the most critical issues are the length, wind force and temperature of the equipment oven. These are the problems that all printing enterprises will encounter when using Gravure plastic ink. The ink drying temperature does not refer to the temperature on the thermometer visible in the oven, but refers to the temperature blown to the surface of the substrate. Many people have misunderstood this aspect. Because the sensors of domestic printing machines are installed in different positions, the temperature displayed is also different. Many times, people see that the temperature seems to have reached the required temperature, but in fact, the temperature in the oven is so high, The temperature blown to the film surface is not so high, so the equipment of most printing enterprises can not meet the drying requirements of Gravure plastic ink

therefore, there must be some differences between the Gravure plastic ink printer and the solvent based ink printer. The solvent based drying system only needs to ensure that the solvent can volatilize. Gravure plastic ink requires a set temperature to ensure the drying speed, and the oven must reach a certain length

at present, the soft packaging enterprises are in a period of low profits. Most enterprises will not take the initiative to request the transformation of equipment, which is also a main reason why they are unwilling to use ink

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