EVA hot melt adhesive, different from general cold glue, according to its characteristics, the following points must also be mastered and paid attention to in use:
1. It is necessary to recognize and master the various types and technical properties (including technical parameters) of EVA hot melt adhesives. The opening time and curing time of different types of hot melt adhesive are also different, especially the use period of summer glue and winter glue should be strictly distinguished, and the opening and curing time will also change when the temperature is different.
2. When using EVA hot melt adhesive, do not use open flame for direct heating, and be sure to use septum oil solution heating (the boiling point of water should be 100 °C), or use a sealed electric hot plate for heating.
3. Before using the solid EVA hot melt adhesive, it should be preheated with a preheating device and then released into the working glue box for use. The preheating time is generally about 2 hours. When using glue, it is not allowed to directly mix solid glue blocks (i.e., glue without preheating) in the gluing box, so as to prevent the gel from having poor fluidity or coating the unmelted colloid on the back of the book, resulting in uneven gluing and affecting the appearance quality of the book.
4. The amount of glue in the preheating glue pot should be grasped appropriately, and the colloid will melt in turns after adding too much, which will make it deteriorate and age, reduce viscosity, and affect adhesion.
5. During the opening time of the hot melt adhesive, the whole bonding process should be completed, and if the machine is shut down in case of failure, the books in the book folder should be taken out in time, especially the book core above the gluing wheel should not stay.
6. When repairing the wireless adhesive binding equipment for a long time, the pre-glue and working glue pot should be turned off to prevent the aging of the gel.
7. The temperature of the molten colloid should be strictly controlled within the range of use.
8. It is necessary to regularly clean the pre-glue pot and the working glue box to keep the glue pot clean and prevent the accumulation of impurities in the glue from affecting the accuracy of temperature control, and even causing the thermostat to malfunction and cause colloid combustion. Generally, under the normal operation of production, the preheated rubber pot should be cleaned every 3 months; The working glue box (for gluing) should be cleaned every half month. A system should be set for cleaning up the plastic pot to facilitate implementation.
