... OPP material such as plastic bag machine,can be equipped with three-side sealing machine, ziplock bag machine, etc.2. Features:(1) ... , spot welding, etc. Bags that were welded by this machine look beautiful.(2) Strong and stable output power: piezoelectric ceramics ... digit dial code switch, adjustable 1 / 100 seconds precision, easy to adjust.(6) Be compatible with automated machine or a bag machine ...