| 摘要 |
PROBLEM TO BE SOLVED: To prevent a deteriorated resin from flowing on the downstream side by preventing the retention of the resin in the channel of a screen changer. SOLUTION: In the screen changer comprising a slide bar 1 into which a breaker plate 3 which holds a screen 4 is inserted and a screen changer main body 2 which holds the slide bar 1 slidably, a retention preventing adapter 5 having a channel expanding toward the breaker plate 3 is installed between the surface on the upstream side of the breaker plate 3 and the screen changer main body 2.
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