ポリビニルアルコールを使って膨張させる
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プロの方にお願いします。ポリビニルアルコールをツインスクリューで膨張させると、出来上がった製品が収縮して硬くなってしまいます。どうすれば解決できますか？柔らかく弾力のある状態にする。
もう一度聞くけど、知ってる人いる？ :D
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