There are two angles (α and β) when the spring is put onside the profile . When the winder acts on the film, the force is transferred to the spring, according to the force theory, if α less than β,the profile will lpck the spring and the spring will move downwards; if α greater than β, the spring will move upwards. When the wind-resist SK profile is used with the spring, as α less tha β, the more wind loading, the more of force to go downwards. It is hard to collapse. On the contray, for the common profile and U shape profile, α greater than β, so the more wind loading, the more force to go upwards. It is hard to cpllapse.
 

working with lockup profile ,it can stand 12 grades(>117km/h) wind to ensure the greenhouse safety;
special 72B spring steel wire, the spring maybe used many times without distortion;
The length may reach 2.2m after insert the profile;
Anti-aged and anti-UV treatment on the surface, resistance to severe high or low temperature;
Plastic coated to care the film and operator;

Features:

* Full thickness , High strength
* Full zinc coating and long anti corruption time
* Scientific interior angle design and self - locking performance.

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