1. The book is very smooth
According to the recommended brushing thickness, the thickness of the book block brush is about 0.025cm. At this time, the pur adhesive layer is much softer than the eva hot melt adhesive. Therefore, the book is opened very flatly, and the book does not have to be pressed by hand when reading, and the leveling of the book is improved. The reader's reading comfort. Therefore, pur is favored by some large companies. For example, Microsoft and Texas Instruments use pur hot melt adhesives to bind product manuals.
2. High temperature and low temperature resistance
Put a book bound with pur hot melt and a book bound with eva hot melt into the refrigerator for one night. Then take the two books from the refrigerator the next day and open the book. You will hear the cracking sound of the eva hot melt binding book, while the pur hot melt binding book is intact.
The refrigerator test simply simulates the environmental conditions that the book may face in the winter. To test the durability of the pur binding book under summer environmental conditions, the book can be placed on the back seat of the car during the day. At this time, the ambient temperature can reach 43°C. At this temperature, the eva hot melt binding book begins to disperse. The page falls off and the pur-bound book remains intact.
Even if the pur book is placed in a high or low temperature environment, it will not be affected at all. Even if it reaches 94°C or minus 40 degrees, there is no problem.
3. Spine formation
When ordinary hot melt adhesives are used to bind irregularly textured art paper book blocks, a large amount of wrinkles are generated at the grooves. Since pur hot melt adhesive is a cold glue adhesive, the working temperature is low, so the moisture of the paper at the spine is not lost. At the same time, the pur adhesive layer has a certain degree of ductility in the drying process, so that the paper fibers can be restored.
In addition, due to the small amount of pur hot melt glue used in binding, few adhesives are squeezed out on the enclosing table, and the splints on both sides firmly wrap the cover on the book block to form a stiff spine.
4. The smoothness of the book block cut is trapezoidal
Because the pur hot melt adhesive coating thickness is only half of the thickness of other hot melt adhesive coating, the incision is smooth without trapezoidal shape when cutting, and the edge of the book seal is also very smooth.
5. Solvent resistance
Some bookbinding experts believe that pur is the only type of binding material that is both solvent and grease resistant. The dry-fixed pur adhesive layer is immersed in solvents and greases used in the printing industry, such as methyl ethyl ketone and alcohol, and these chemicals have no effect on the pur adhesive layer. On the other hand, some of the solvents used in the printing industry will completely soften or even dissolve frequently used hot-melt adhesives, such as eva.
6. For hardcover cost savings
For many years, the book block of the hard-back book has been used for sewing, and before brushing, a tough adhesive is applied to the book block. According to the use of some users, put a book line with a lock line in the book, and then apply pur hot melt adhesive. This kind of binding can save about 30-40% of the cost.
7. Good rounding performance and arc deformation
Many hardcover books use round spine backs to enhance the beauty and durability of the book. Brush the pur adhesive on the book block, then round and ridge to get a more beautiful round ridgeback. Since the pur pad and the book block are dried in a circular state, the durability of the round book back is maximized.
While the ordinary hot melt adhesive is used for binding the book block, it is generally used for brushing and then rounding. Therefore, the durability of the circle cannot reach the effect of pur adhesion.
