With plastic (poly film, etc.) film as the cover of the book book, Ping was introduced to China more than 10 years ago, once a year, all parts of the country were covered with filming equipment; books cover the book regardless of hardcover, paperback, saddle stitching More and more are using this material for decoration. In the past 10 years, the quality of the film has not been resolved. For this reason, publishers often have opinions on production units, and economic losses occur from time to time. Although not so much plastic film is still used so hot it? Below we briefly analyze the advantages and disadvantages of this technology.
First, I saw the "hot" so "hot"
1. Covering the cover protects the paper. After the paper is coated, it can extend the life of the cover, especially for students' textbooks.
2. Imprints are not easily damaged. After the film is covered, the cover of the color image can have the same protective effect, and it is not easy to be worn. Thanks to these advantages, the fine art editors of the publishing house are able to make various art designs on the cover. Therefore, publishers and editors are happy to adopt it, thus promoting the increase in usage.
3. Film production is profitable. The cost of film production is low, and there are profits. Companies can make money.
The above three points are the main cause of interest and heat.
Second, the film of the problems and causes
The main problems with the film cover or paper are: blistering, wrinkling, uneven bending, separation and separation. These three issues have not been resolved for 10 years. The reasons for this are many:
1. Effect of paper types
In the film coating process can also be effect, and offset paper is not easy to film. The same paper is different from the manufacturer, the paper batch is different, but also prone to quality problems.
2. Different effects of ink
In the actual processing, the substrate surface ink is light and easy to cover the film, and black, composite color and other dark color effect is extremely bad, often appear super bubble, wrinkle and so on. If it is a figure of a person, the face is light-colored and the clothes are dark. The result is that only the face is flat, and the clothes are wrinkled.
3. The impact of climate
Because of the great differences in temperature between north and south of China, the same materials are used, and the effects produced in the south and north and in different seasons are very different. There are heating and no heating seasons in Beiguang. The wet season and high temperature seasons in the south are all related to the coating quality.
4. Influence of environment and conditions
The film-covered environment should be constant temperature, no dust, humidity is about 50%, while the glue part should be sealed, and now the manufacturers across the country to achieve this standard conditions are few.
5. The effect of the binder
As the companies that manufacture film-coated adhesives do not have certain industry standards and there are many manufacturers, batch data are inaccurate and inconsistent. These are also important reasons for poor film coverage.
6. No scientific testing equipment
At present, hundreds of film-covered manufacturers across the country generally do not have scientific testing equipment. For example, the use of cassettes, freezers, and other detection devices, so the limitations of the use of products after the film, resulting in the emergence of the problem can not share the north and south.
7. Working temperature effect
The temperature used in the coating is directly related to the type of binder. Some adhesives may use an operating temperature of 60-70°C, but some adhesives may only use operating temperatures between 20-35°C. This is related to the difference in the temperature conditions of the film. However, many manufacturers often do not grasp it correctly. Therefore, it is necessary to scientifically analyze the temperature conditions of the film and the required working temperature of the adhesive when used, and proper cooperation can achieve good results.
For the above 7 reasons, the current coating and use units in China are still often unable to be resolved, and some are not easily solved.
Third, the film damage
The damage of the film is serious and it mainly deals with two humans:
1. Cover all caused by white pollution
There are two aspects of the pollution of the film: First, the film cannot be corrupted in the air, and it is difficult to recover, resulting in environmental pollution; Second, the intervention in the processing, harmful to human health, long-term use of hazardous to the health of workers.
2. Laminated paper cannot be recycled, destroying resources
At present, 80% of China's paper-making cellulose sources rely on the recycling of old paper, including paper edge paper. The amount of paper used in books and other books is very large. If we use large quantities of coated materials, the used old paper, including trimmed paper edges and paper hair, cannot be recycled. This will give the country The loss that cannot be counted is actually destroying resources. In the survey, we also discovered that some units, due to the cutting off of the edges of paper and paper with coated film, were not recycled by the paper mills and could not be processed. A self-made stove was used to combine these cut papers with uncoated paper edges. Burn it off. This not only caused the waste of resources, but also caused a second environmental pollution. The consequences are serious. However, this phenomenon has not attracted the attention of the relevant leaders and responsible departments for more than 10 years.
More than ten years ago, some advanced countries that used film-covered materials and technologies in the early days were closed to us. In the past year or two, foreign countries, especially the United States, have sent some "advanced technologies and materials" in this area to China. Promote introduction. What is the reason for this? 7 The meaning of drunkards is not alcohol. Because they also found the hazards of this material, they have already classified this technology as being eliminated, so they tried to promote it to China. We must think more about this, or we will be deceived. We should take into consideration the overall situation of sustainable development of the country. We should not only care about the small profits of our own company, and we should not hesitate to cause the two major hazards that we are unable to relieve: one is white pollution, and the other is destruction of resources.
The above facts prove that the use of film for paper books and other books is more harmful than profit, and therefore it is recommended that the relevant departments, publishing houses, design agencies, and production units should control the use of the film, and it is better not to use them. In this appeal, the vast majority of my colleagues in the printing industry should protect our country's environment and resources. These two functions are in the present day and will benefit our great contribution to the future.
Author: Beijing printing school
