| 摘要 |
PURPOSE:To prevent films from being closely adhered to each other, by sucking the outside of films which are laid, one over the other, in a method in which 2 sheets or more of thermoplastic resin films, which are laid, one over the other, are stretched by a tenter method. CONSTITUTION:Two sheets of thermoplastic resin film 1 and 1', which are laid, one over the other, are fed into a stretching process in such a condition as keeps both ends grasped by clips 2 and 2' of a tenter system stretching device, and are stretched as they are heated by hot blast blwon against them from hot blast nozzles 3 and 3'. The films are protected from being adhered to each other by sucking the outside of the superposed films by means of sucktion ducts 4 and 4', and with it the films are stretched, whereby the films can be separated from each other after stretching. This method is effective particularly to stretching of a crystalline resin film such as polyolefin, polyester and the like. |
