EVA (ethylene-vinyl acetate copolymer) type hot melt adhesive plays a crucial role in book binding. Its good bonding properties and weather resistance make it the adhesive of choice for wireless bonding processes. However, in order to ensure the binding quality of books and periodicals, it is essential to test the binding strength of EVA hot melt adhesive.
EVA hot melt adhesive is a solvent-free, moisture-free 100% solid fusible polymer. It is a solid at room temperature and becomes a liquid adhesive that can flow and has a certain viscosity after heating and melting to a certain extent. It is widely used in book binding, packaging, furniture manufacturing and footwear production, with excellent bonding properties and weather resistance.
According to the requirements and testing methods for the use of EVA hot melt adhesive for CY/T 40-2007 bookbinding, the bond strength after bookbinding should be greater than 4.5N/cm. This standard ensures that books are not prone to problems such as loose pages and paper drops during normal use.
The testing of the binding strength of books is a key step to ensure the quality and durability of books. Through testing, it is possible to quantify the maximum force that the adhesive can withstand when connecting the book block to the cover, thereby assessing the stability and reliability of the book in the course of long-term use. This is crucial for publishers, printers and readers.
Tensile strength test
Principle: The test sample is stretched until it breaks, and the maximum tensile stress in this process is measured
Instrument: YT-BBS500Q pneumatic Page Pull Tester, test items: middle page test, side page test.
Methods: According to the relevant provisions of GB/T 528-1998, the maximum tensile stress at fracture was recorded, expressed in MPA.
Intermediate page test
At 23 ° C ±3 ° C, place the sample book on the sample table, adjust the page baffle according to the page length and lock the screw, find the middle page of the book, and keep the page in the center position. The wide edge of the measuring page is attached parallel to the page guide plate and leads upward along the seam to the page clamping device, and the wide edge of the measuring page edge is attached parallel to the page guide plate and leads upward along the seam to the page clamping device. The fixture is rapidly stretched to test the middle pages of books and periodicals. When the ratio of the external force on the page to the page length is greater than 4.5N/cm, the bond strength of the binder can be judged to be qualified.
Edge page test
Under the environment of 23±3, pull the side page fixture back to the middle of the sample table and be locked by the buckle, adjust the instrument to zero, input the actual page length, test speed according to the standard input 50mm/min, place the sample book to be tested on the sample table, and the second page of the inside page of the book is used as the test page. The thicker part of the edge of the sample book under test is drawn from the oblique rear to the side page holder device, and the wide edge of the tested edge page is attached to the guide plate in parallel and drawn upward along the seam to the page holder device. Adjust the sample book under test according to the page length, so that it is in the center position with the scale of the page holder, hold the spine of the book with your hand, and gently attach the sample book to the side folder. Click the side page test button. Fixture express stretching for testing.
YT-BBS500Q pneumatic Page Pull Tester is an important means to ensure the quality and durability of books. Through scientific testing methods and strict standard requirements, the binding quality of books can be evaluated and corresponding improvement measures can be taken. This is of great significance for improving the printing quality and market competitiveness of books and periodicals.
