But the strength of the cartridge case after ironing drawing cannot be accurately calculated by this formula, because the result of calculation is lower than that reached in practice.
用常规的幂强化公式计算药筒在引伸后的强度时，数值偏低较多，原因是该公式未考虑引伸凹模锥角对强化的影响。
The inner layer of the filter cartridge is polypropylene frame that can improve the filter cartridge's Pressure-resistant strength.
滤芯最内层为聚丙烯骨架，用以加强滤芯的耐压强度。
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