Abstract: Spun-bonded process was used on the Polypropylene needled felt’s surface. Obtaining certain aperture and permeability properties of the controlled permeability formwork liner after heat-seal lamination treatment. The best technology to make spun-bonded/needling controlled permeability formwork liner was acquired through the orthogonal experiment, then the effect of the hot-press temperature and the weight of spun-bonded on the relevant properties of formwork liner were discussed. The results showed that the optimal hydraulic conductivity was obtained when the hot-pressing temperature was 171℃, hot pressing time was 4 s, hot pressing pressure was 1.5 MPa. Under the same hot pressing time and pressure, the fiber density of the formwork liner and the performance of the surface condensation changed along with the hot-pressing temperature and affected the effect of the end use.

Key words: spun-bonded, formwork liner, aperture