In order to improve the lifespan of punch pin for al tube, the failure reason was carefully analyzed by SEM.

The most common neural tube defects are spina bifida, in which the spin al cord fails to close completely during fetal development, and anencephaly, in which part or all of the brain doesn't develop.

The structure, property, partition, process and market analysis for the al plastic composite tube are described in this paper, and this product's technical economical cost are evaluated.