(57) Abstract Objective By adding improvement to the distribution path, in the die/diWithout making spiral number of gashes decrease, air giving of large diameter anti-The cold air passage inside the tube or the bubble, diameter of the die/di to large diameter is convertedTo guarantee without thing, cool the bubble sufficiently, the filmMaterial properties former ones without being inferior the filmIt makes formation possible. Constitution From destal of each main distribution path 20 furthermore 2 sub- distributionPath 30 doing to divide the branch, it communicates to the bottom of the spiral channel 13As it has done, the main distribution path 20 which it adjoins and sub- distribution path 30You avoid in the position where, cold air passage 40 inside the bubble of large diameter distributionThe position it is done. Because of this, the number and spiral number of gashes of distribution pathsSeeing in plane surface without making decrease, the amount in this die/diBe able to simplify the layout relation of the distribution path, the main distribution path 2 which at the same time it adjoinsIs surrounded on 0 and sub- distribution path 30 the field where it is taken widely with the fact thatComing, the cold air passage 40 inside the bubble of large diameter laying out in this fieldIt is possible to do.
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