| 摘要 |
PROBLEM TO BE SOLVED: To provide a prepreg which can contribute the breakage reduction after vacuum packaging as for a vacuum packaging material. SOLUTION: In the prepreg 1a, in which the rectangular four corner portions 2a-2d are replaced with the circular arcs 3a-3d which are curved line portions and no acute angle portions (90°or below) exist which tend to cause the breakage of vacuum packaging, it can be ensured that the vacuum packaging material which vacuum packs the prepreg is hard to be torn. Similarly, in the prepreg 1b, which has a shape in which the four right-angled triangles 4a-4d including the rectangular four apex angles 7a-7d are sectioned from the rectangular four corners and in which no acute angle portions (below 90°) exist which tend to cause the breakage of vacuum packaging, it can be ensured that the vacuum packaging material which vacuum packs the prepreg is less prone to be torn. COPYRIGHT: (C)2004,JPO |
