felt laminating machine double layer roofing sheet roll forming machine roof deck roll former 

double layer machine combine two profile on one machine, obvious advantage is save space,save cost.
How to control or choose which layer start working ? We use a clutch to choose which layer is given transmission power.
Cangzhou zhongtuo roll forming machinery Co.,ltd.
Melinda Xing
whatsapp/wechat: 008617832978885