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In double-faced corrugated board, two liners are securely bonded to the corrugated medium, providing the strength of a structure. This adhesive strength is tested as follows. Two pin apparatuses are inserted between threads of the corrugated medium and the liner. One of the pin apparatuses is inserted from one side, and the other, from the opposite side, forming a U shape, on both sides of the specimen. This specimen is set onto the crush tester's compression plate to read the value of the adhesive strength. This is referred to as the double-faced pin adhesion test method, and you can observe that the pin apparatus on the side with weaker adhesion strength comes off first. In the single-faced pin adhesion test method, every other pin on a pin apparatus is inserted between a flute and the liner to measure adhesion strength.

参考規格 :

• [JIS]Z-0402-1995
• [TAPPI]T-821