| 摘要 |
PROBLEM TO BE SOLVED: To provide an air jet nozzle which prevents the jetting direction of a jet flow from going crooked, ensures high uniformity of transmission efficiency of a resin film width direction, and is suitably used for a stenter oven. SOLUTION: This air jet nozzle for blowing air against a resin film is conveyed in one direction. The air jet nozzle has a plurality of jet holes formed on a surface facing the resin film surface. The jet holes are arranged in such a manner that columns constituted of a plurality of jet holes in a direction orthogonal to the resin film conveying direction is n where there are 4 or more columns in the resin film conveying direction and even, in the hole columns of the n columns, first, second, third, fourth, to n columns are set from the upstream side of the film conveying direction, and intervals between the second column and the third column and between the (n-2)-th column and (n-1)-th column are larger than those between the first column and the second column, between the third column and the fourth column, and between the (n-1)-th column and the n-th column. COPYRIGHT: (C)2010,JPO&INPIT
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