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s contents. The flutes also serve as an insulator (絕緣體, 絕熱器,保溫層), providing some product protection from sudden temperature changes. At the same time, the vertical linerboard provides even more strength and protects the flutes from damage. Flutes e in several standard shapes or flute profiles (A, B, C, E, F, etc.). Aflute (A楞)was the first to be developed. Bflute was the next and is much smaller than Aflute. Cflute followed and is between A and B in size. It is also the most mon large flute profile. Eflute is smaller than B and Fflute is smaller yet. Due to variances in flute sizes between manufacturers, FBA no longer publishes flute guidelines. In addition to these five most mon profiles, new flute profiles—both larger and smaller than those listed here—are being created for more specialized boards. Generally, larger flute profiles deliver greater vertical pression strength (垂直壓力)and cushioning, while smaller profiles provide better resistance to process and printing crush. Different flute profiles can be bined in one piece of bined board. For instance, in a triple wall board, one layer of medium might be Aflute while the ot