An overlock machine is a must-have piece of machinery in the metal roof installation process. After the roof panels are fastened, lock the sides with a locking machine, which increases the airtightness and waterproof performance of the roof. A good lacking machine can realize that it can move forward and backward freely, and can also be soft according to the thickness of the roof panel. Hardness, resilience, adjust the bite gap and seaming speed to protect the roof tile paint film intact
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