| 摘要 |
PURPOSE:To improve profile control performance in relation to extrusion molding terms of a film sheet, by obtaining a correlation between a quantity of operation of a die bolt and a quantity of variation of a profile by making use of them. CONSTITUTION:Simultaneously with starting of a molding process operation of a die bolt and measurement of profile data are started by holding time intervals wherein a film sheet arrives at a molding roll part from a T die lip outlet by setting up the initial data on a position corresponding to the die bolt by obtaining the initial data, and in succession to the above, correlative coefficients of those two time train data are operated by a correlative operation expression. In the case where the maximum value of the correlative coefficient is obtained and the maximum value is generated, for example, with a quantity deltai.j of operation of a die bolt and a quantity ek.j of variation of a profile, a point of measurement on a film sheet corresponding to the first die bolt i allots or sets up or corrects a kth point k of measurement. Such a process is carried out at any time even during a molding process, control of a thickness of the sheet can be effected automatically. |
