钢丝弹性小，压膜较紧，在风力不大时，棚膜被风吹起时上下起伏较小，不易受到损害。但风力大时，只要气流一进入拱棚中，棚膜上下起伏幅度较大，由于钢丝直径在0.15cm-0.25cm，与棚膜的接触面积较小，没有弹性的钢丝就很容易将棚膜勒破。而且，这种钢丝随着雨水的增多，其寿命也不够长久，如果检查不及时，极容易被风吹断，刮坏薄膜。

Small wire elastic, squeeze film is tight, when the wind is not big, films by the wind of ups and downs, when it is not easy to damage. But when the wind is big, as long as the air flow into the tunnel, the films of ups and downs amplitude is bigger, because the wire diameter in 0.15 cm - 0.25 cm, and the films of the contact area is lesser, no elastic steel wire is easy to films, broken. Moreover, this kind of steel wire with more rain, the life is not long, if not timely examination, is extremely easy to be blown off, scrape bad film.

因此，建议菜农使用加粗型尼龙绳来压膜，因为这种尼龙绳的弹性大，当遇到大风时棚膜虽然也被风吹得上下起伏，但尼龙绳会随之上下起伏，再者加粗型尼龙绳粗度达到0.6-0.8cm，与薄膜接触面积大，所以对棚膜产生的破坏小，当风力较大时，发生压膜绳勒坏棚膜的可能性会大大降低。

Therefore, suggested that the farmers use bold type nylon cord to squeeze film, because this kind of nylon rope elasticity, films though when faced with the wind was the wind ups and downs, but with the ups and downs, of nylon rope and bold type nylon rope roughness is 0.6-0.8 cm, and the film contact area is large, so the damage to the films produced is small, when the wind is bigger, the possibility of a squeeze film rope, bad films will be greatly reduced.

在建造拱棚使用粗尼龙绳作为压膜绳时，只需要在拱棚最边缘立柱与棚面的转角处，用碎布或用剪成4-6cm宽的自行车外胎压于尼龙绳底下，减少转角处尼龙绳对棚膜的损坏即可，方便可行。

In the construction of tunnel using thick nylon rope as squeeze film rope, just on the edge of the tunnel the pillar and shed the corner, with a cloth or use cut into 4-6 cm wide under the bicycle tyre pressure in nylon cord, nylon cord damaged the films can reduce the corner, convenient and practical.