Baler is mainly composed of conveyer belt, back strap, connector disconnect devices, transmission systems, comprising rail rack and control device. Using straps wrapped product or package, then tighten both ends and buckle used by heating and melting or other material connections of the machines. Packer's function is to make plastic bags close to the surface are bundled packages and guarantee packages in the transportation, storage, not scattered by the strapping is not strong, but should also be bundled neat appearance.