冬暖式大棚的棚膜固定过去一般有两种形式:压膜杆压膜和压膜线压膜。前者压膜比较牢固,抗风,一般不存在风害鼓棚现象,但由于压膜杆与膜下拱杆连处棚膜均被细铁丝穿破,一个占地一亩的大棚棚膜要被穿破4800多个小孔,而且这些小孔在风力作用下越来越大,扣棚后3个月,即进入寒冷的冬季,保温效果显著下降,对越冬茬生产极 Winter shed greenhouse film fixed in the past there are two general forms: the film pressure film and laminated film laminated film. The former film is relatively solid, wind resistance, there is no wind damage drum phenomenon generally, but because of the film with the film arch with the film at the roof are thin wire worn, an area of ​​?? acres of greenhouse film to be Piercing more than 4800 holes, and these holes in the wind under the action of more and more big, buckle shed after 3 months, that is, into the cold winter, the insulation effect decreased significantly, the winter stubble pole