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雙層設計不僅在工藝上難度加大,還同時具有兩方面的突出優越性:視覺上飲料猶如懸浮于空中,光線透過飲品投射在外壁上,呈現奇妙的時尚感;雙層中間的空氣具有隔熱保溫的功能,不論飲品冷熱,外壁始終接近室溫,持握十分舒適;雙層杯壁設計,產生了杯中杯的魔術效果。雙層杯不是真空的,在杯子的外層底部都有一個出氣孔,是因為在吹制過程中要排出氣體,防止杯子變形和爆炸,生產完成后再進行封孔,這樣比較安全的。雙層杯中間的隔層可以延緩散熱的時間,達到一定的保溫性能,喝熱飲時不會燙到手,喝冷飲時外壁不會產生水霧。

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