Kuralon is a synthetic fiber made of Polyvinyl Alcohol (PVA), which is used in many industrial applications owing to its unique and excellent performance such as high-tenacity and -modulus, dimensional stability, hydrophilicity, alkaline resistance and UV-stability. In particular, Kuralon is used for rubber reinforcement applications, taking advantage of its tenacity and dimensional stability. For reinforcing rubber, the fiber and the resin must be bonded, and RFL (Resorcinol-Formaldehyde-Latex) has conventionally been used as this adhesive. However, resorcinol and formalin are concerned chemical materials to give environmental negative effects. Therefore, we’ve developed a new adhesion technology using liquid rubber, which also does not contain latex to replace RFL, and we’ll report on its performance.