| 摘要 |
Disclosed is a method for producing a thermoplastic resin sheet or film, wherein a raw resin material to which have been added one or more additives selected from the group consisting of a nucleating agent, fine powder of a high melting point polymer, a petroleum resin, a terpene resin and an organic peroxide is melted under heat to form a resin sheet or film, the resulting resin sheet or film is brought into contact with and adhered to the outer surface of a cooling roll having a mirror-finished surface or the outer surface of an endless metal belt having a mirror-finished surface and then moved along with the roll or the belt, and thereafter it is inserted, pressed and cooled between the outer surface of said cooling roll and the outer surface of said endless metal belt. Also disclosed is a method for producing a thermoplastic resin sheet or film, wherein a raw resin material to which have been added one or more additives selected from the group consisting of a nucleating agent, fine powder of a high melting point polymer, a petroleum resin, a terpene resin, an organic peroxide and a crystalline polypropylenic copolymer is melted under heat to form a resin sheet or film, the resulting resin sheet or film is inserted between a cooling roll having a mirror-finished surface and an endless metal belt having a mirror-finished surface, then it is moved and cooled while being kept in contact with the outer surface of said cooling roll between said cooling roll and said endless metal belt, and thereafter it is pressed from the inside of said endless metal belt, then it is released from the contact with said cooling roll, and it is further moved while being kept adhered to said endless metal belt and then peeled from the belt. The non-oriented sheet or film thus produced, having a high surface gloss, a high surface smoothness and a high transparency, is suitable for wrapping foods, medicines. etc. |
