与商品两性及阳离子淀粉比较，改性PAM在提高纸张强度方面有很好的效果，尤其是在提高纸张耐折度方面显现出明显优势。

Compared with cationic and amphoteric starches, modified PAM has obvious advantages in strength improvement, especially in the folding strength of paper.

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结果表明，氧化淀粉能有效地提高纸张的耐破度、耐折度等物理强度。

The application result showed that the physical property of paper has obvious raise, for example, tensile strength, tearing strength, folding strength.

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制备出几种淀粉衍生物表面施胶液，并对比了施胶后瓦楞纸的环压强度以及耐折度这两项指标。

Several starch derivatives was prepared as surface sizing agent, and then compared two indicators including ring crush strength and folding endurance.

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