Polyvinyl alcohol release film for artificial marble molding, and method of manufacturing artificial marble using it

摘要

A release film that is placed between the stock solution and the shaper when the stock solution, which is the raw material for artificial marble, is supplied to the shaper and solidified and molded. The release film is a polyvinyl alcohol film. It is a polyvinyl alcohol release film for artificial marble molding that is present and satisfies the following formula (1). As a result, even in the production of wide artificial marble, wrinkles and curls generated at both ends can be suppressed, the surface shape of the obtained artificial marble can be prevented from being defective, and the process of grinding and polishing the artificial marble can be simplified. , A polyvinyl alcohol release film for molding artificial marble, and a method for producing artificial marble using the same. 4.6 × 10 -3 ≧ Δn (MD) 0 − 1.4 × 10 -3 ≧ Δn (TD) 0 ≧ 1.0 × 10 -3 (1) [In the formula (1), Δn (MD) 0 indicates a value obtained by averaging the double refractive index in the mechanical flow direction in the central portion of the polyvinyl alcohol release film in the width direction in the thickness direction of the film, and Δn (TD). ) 0 indicates a value obtained by averaging the double refractive index in the width direction in the central portion in the width direction of the polyvinyl alcohol release film in the thickness direction of the film. ]