FIELD: mechanics.
SUBSTANCE: proposed device comprises one drive roller running at speed V1 and second drive roller running at speed V2. Note here that V1<V2 and rollers are arranged with a gap between them designed for stretching. The device intended for maintaining the sheet width clamps mechanically both film sheet edges areas. In stretching, the aforesaid gap width does not, in fact vary. Aforesaid device for maintaining the sheet width invariable comprises two pairs of supports. The proposed method of longitudinal film sheet stretching with the help of the above device consists in that the film is, first, directed over the low-speed roller, then, via the stretching gap to go over the high-speed roller. In stretching in the said stretching gap, both edges of the film are locked between the rollers of two pairs of supports. The proposed invention allows producing oriented film that features notable longitudinal shrinkage at increased temperature and does vary its crosswise sizes.
EFFECT: simple and efficient method.
31 cl, 14 dwg, 3 ex
