Binding is one of the important processes in the post-press process. At present, China's books mainly use the wireless binding process, and the adhesives used are mostly EVA hot melt adhesives. However, there are some environmental problems in the EVA hot melt adhesive itself and the use process. .
First of all, from the perspective of EVA hot melt adhesive itself, in addition to the main components such as ethylene, vinyl acetate, rosin, paraffin, etc., in order to prevent the adhesion of EVA hot melt adhesive at high temperature, some antioxidants are added. There are two kinds of antioxidants currently used, one is non-polluting pentaerythritol propionate, and the other is di-tert-butyl-p-cresol with certain pollution. There is no standard requirement for EVA hot melt. The latter substance should not be used in the glue. I have been to a joint venture adhesive manufacturer. When the author asked the owner whether there was cresol in the adhesive, the boss replied, but when asked a worker, he said that there is a problem with the composition of EVA hot melt adhesive. Did not cause the attention of adhesive manufacturers. But we must be clear that almost all paperback bookbinding books use EVA hot melt adhesives. The use of EVA hot melt adhesives is nearly 20,000 tons per year, involving more than 5 billion books and more than 4 billion books. Therefore, the environmental protection of EVA hot melt adhesive itself must attract the attention of the society, and relevant testing standards need to be improved.
Secondly, printing companies also have environmental problems when using EVA hot melt adhesives. 1 Preheating the rubber barrel and using the non-exhaust system on the plastic barrel, the gas containing the synthetic resin fumes, carbon dioxide and other harmful substances discharged after the EVA hot melt adhesive is heated (the temperature is above 150 °C) is all distributed in the workshop. At any time, it harms the health of workers and pollutes the environment. 2 The amount of glue in the preheating rubber barrel is too much, and the EVA hot melt adhesive is repeatedly heated. The lighter will cause the colloid to deteriorate and the viscosity and strength decrease. The heavy colloid will carbonize and emit smoke, and the carbon dioxide will be discharged in a large amount. Unrecoverable consequences. 3 Do not clean the plastic drum according to the standard or clean the plastic drum at all. This method will not only cause the adhesive to precipitate, but also affect the bonding strength, and will also cause the adhesive to be carbonized and powder on the edge of the plastic barrel. After the fire caused a fire. For the above phenomenon, printing companies should strictly implement the CY/T40-2007 "EVA type hot melt adhesive requirements and testing standards for bookbinding and binding" formulated by the National Printing Standardization Technical Committee, and correctly use EVA hot melt adhesive.
Of course, in addition to the environmental protection problems mentioned in the laminating and binding process mentioned above, there are still excessive noise in the post-pressing section, some of the cover materials are highly polluting, and the development and promotion of new green post-printing processes are weak. Issues related to the lack of awareness of the importance of green post-printing by leaders, departments and printing companies. Although some problems, such as the development of environmentally friendly materials, involve many industries, we cannot solve them directly and in a timely manner, but most problems can be solved by improving industry standards, strengthening industry monitoring, and improving the standardization level. Therefore, the relevant industry management departments should strengthen the guidance of printing enterprises, strengthen the printing enterprises' understanding of the importance of green printing, so that they can put green printing on the agenda, make our people healthier and make our environment more beautiful. !
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