The carbon fiber square tube needs to go through the layup process in the production process, but the rectangular tube layup is more difficult, especially at the corners. If sufficient external force cannot be applied to fully fill the prepreg, then the carbon fiber is long. The square tube will appear relatively loose, delamination and cracking in these areas, which will affect the overall strength and performance.
1. Although the layup of carbon fiber rectangular tubes is more difficult, it is not impossible to overcome. Combine pre-compaction and suitable temperature, lay up one or several layers, and then pre-compact at the right temperature, so that the blank will not absorb glue again during the curing process and can maintain good overall performance .
2. The wrinkles left by the auxiliary materials are not fixed, as long as the film surface is pulled again, it can be eliminated. As long as the operation is perfect before curing, it can still be effectively avoided. In the specific operation, when placing the air felt and the vacuum bag, it is necessary to pay attention to the fit to ensure that there is no overlap, so that the surface of the rectangular tube can avoid wrinkles.
If the manufacturing process and experience are the same, the density of the carbon fiber square tube and the round tube should be almost the same, but in practice, any small detail change will cause a difference in value. Many details ultimately determine the high and low performance of carbon fiber products, which is why domestic carbon fiber is not as good as Japanese and American carbon fiber, because these problems require constant trial and error to find the right path in the end.
