Analysis of Problems in the Use of EVA Hot Melt Adhesive

Analysis of the causes of book block breakage

1. Uneven coating;

2. The milling back of the book is not parallel;

5. The cover paper is too thick and hard, the book core paper is too thin, and the cover and book paper are thick and thin, with different pulling forces, causing the front and back pages to break;

II.Analysis of the causes of bubble formation

1. Improper adjustment of rubber roller height;

2. The height of the bookshelf is not suitable;

3. The glue temperature is too high or the gel is not good;

4. The sticking time was slightly later and not completed within the opening time, resulting in sagging after gluing, and the appearance of glue cream like, such as bubbles;

ThreeBooksBackAnalysis of perforation reasons

1. Inconsistent thickness of the book back leads to non parallelism of the book and uneven gluing;

2. Improper adjustment of the rubber wheel, resulting in a stalactite shape after applying glue that cannot be controlled, and the back of the book is stuffed with adhesive;

4. The slope of the book board is too large, and the books are not parallel;

IV.Analysis of Drawing Reasons

1. The cover length is less than the book block length, causing glue leakage at both ends;

2. The amount of glue applied is too thick;

Fifth,Hot melt adhesive smokingCarbonizationCause analysis

1. The glue is melted by long-term heating in the glue pot;

2. Temperature controller malfunction;