Industrial gelatin, as a adhesive, is as good as synthetic resin in its adhesion to fibers. Its advantage lies in its long application period, but its water resistance is poor. In order to improve its water resistance, polyformaldehyde hardening crosslinking agents are usually added to gelatin adhesives, which can reduce the water solubility of gelatin. Without changing the biodegradation of collagen, the gelatin molecular chain can be formed into a bond., so that the viscosity is increased, The solidification structure is strengthened and the mechanical properties of gelatin are improved. As a dry mixture, gelatin can be used in the manufacture of sand cloth and sandpaper, and can also be used in the production of tape paper.
The application of adhesive for bookbinding in the printing industry:
In order to avoid the problem of binding quality due to adhesive, the adhesive for bookbinding should have good anti-aging, high and low temperature resistance, stretching.
Types of hot melt glue used for binding books and periodicals
There are many kinds of adhesive used for bookbinding, among which the largest amount is hot melt glue. Synthetic resin type EVA hot melt adhesive is used in high-speed wireless adhesive linkage production line and stand-alone. It is fast drying, short curing time, and easy to operate, and because it only needs to be physically mixed at room temperature, heated and melted to a certain extent and turned into a liquid, it can be used. Therefore, the melt glue device is simple.
Development Direction of Binding Adhesives for Books and Books
Compared with other adhesives, hot melt PUR has superior performance and better compatibility with equipment. Although the price is relatively high, the amount of glue used is about one-third of that of traditional adhesive and it reduces the occurrence of failure.