Frame welders are used for bulk packaging such as household chemistry, beverages in PET bottles, coffee, etc. The BP-700 is a pneumatic control unit. The welding and feeding cycle to the package shrink tunnel is automatic with a photocell. Operations performed by the operator during operation of the machine are limited to the delivery of packaging products to the conveyor belt. The sealer can be adjusted to vary the width of the shrink film to a maximum width of 700 mm