| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of adjusting a film thickness which can correctly decide a thickness adjustor and its corresponding position for measuring its thickness in the width direction, in accordance with conditions at a given time whatever neck-in phenomenon or orienting conditions may be present. <P>SOLUTION: This method of adjusting film thickness involves the steps described below. A thickness adjustor for adjusting a resin discharge batch in a plurality of specified intervals, is arranged in the width direction of a molding die which squeezes out a molten resin in the form of film. Next, the film thickness is measured in each measurement position in the width direction of the film, using a thickness measuring apparatus arranged downstream from the thickness adjustor. After this step, the thickness is adjusted with the help of the thickness adjustor corresponding to the above measurement position according to the measurements. This method is characteristic in that the output of the thickness adjustor can be changed only by a specified output rate, and a thickness distribution variation due to a change in the above output rate in the film width direction can be measured by the thickness measuring apparatus, and further, that the measurement position, in the film width direction, of the thickness measuring apparatus corresponding to each thickness adjustor can be decided according to the measurements. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
