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Nowadays, more and more books are using EVA hot melt adhesive particles for wireless binding, and almost all large, medium, and small processing factories in China have put this technology into use. This is because the use of this book binding adhesive has the characteristics of fast binding, short operation cycle, good appearance of finished products, and saving several processes, which has become widely popular. However, we often encounter many problems during the binding process due to neglecting the proper use of this book binding adhesive.
Based on past experience and various reference materials, Sunlife will list common usage details as follows:
EVA book binding adhesive is a thermoplastic adhesive, and its opening time after application is affected by indoor environmental temperature and humidity. Generally, the indoor temperature (i.e. production workshop) should be maintained at a constant temperature, preferably between 15-26 ℃, and the humidity should be kept at around 50%. However, it is understood that among the book binding enterprises in the country, it is very rare to meet our standard requirements. Therefore, in many different regions, when using hot melt adhesive, there may occasionally be too many bubbles generated during the summer, making it difficult to cure and cool. In winter, there are problems such as adhesive curing, shortened cooling system time, weak or unattainable adhesion, and book breakage after adhesion. Some companies in certain regions are unable to cut their books perfectly in a timely manner due to the high humidity in the environment, resulting in irregular book shapes after packaging. These phenomena are directly related to the temperature and humidity of the workshop. So, in reasonable circumstances, try to achieve:
For units with conditions, it is best to install temperature control equipment and humidity detection instruments, and place them in a wireless adhesive bonding equipment factory to ensure normal environmental temperature and humidity. As for unconditional units, they should also continuously strive to develop and create conditions for social science standardized management of enterprise production. When these working conditions are not met, we temporarily follow some basic principles: for example, when the temperature is high in summer, the ambient temperature for using hot melt adhesive should be lowered by about 10 ℃, so that the opening and curing time of the adhesive can basically reach a reasonable design requirement range. The books processed by wireless adhesive binding should be stored in warehouses or factories to ensure a working temperature between 1-45 ℃. It is strictly prohibited to stack them for a long time against walls, heating systems (in winter), windows, or in open areas to avoid moisture or excessive system heating that may cause deformation of the paper material and change of the adhesive, resulting in irreparable losses.
In addition, during long-term repairs and wireless adhesive binding equipment, the glue box and glue pot should be closed to prevent the aging of the glue.
According to the reference manual of Sunlife hot melt adhesive, understand and master the technical performance (including technical parameters) of various EVA hot melt adhesives. The opening and development time, as well as the curing reaction time, of different hot melt adhesives vary depending on the model. It is particularly important to distinguish between summer and winter adhesives based on strict requirements. The opening and curing working time may also change when the temperature is different.
EVA book binding adhesive is different from general cold glue. According to its characteristics, it must be mastered and paid attention to in use through the following points:
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