The approaching sack operates the Topforms automatic cycle. Two blades enter the sack, the leading blade accurately positions the top of the sack and the trailing blade stretches the sack to the required width. The sack is then fed forward into the sealer or stitcher at the same speed as the conveyor. This action gives very precise presentation with minimal setting up time.
Systems are supplied with a control panel containing a PLC which links to an infeed sensor to control start/stop times. SMC and Origa Pneumatics for reliability and long life.
The easy speed of the Topform is achieved by the blades moving with the sack then returning at high speed to pick up the next one, up to 15 Sacks per minute are possible.
Works with almost any conveyor with sufficient spare length.
The main requirement of the sack is that the top must remain upright and open as the filled sack is conveyed. Guide boards are usually used to achieve this. Normal size range is 300mm to 600mm wide (including gusset). Sizes outside this range can usually be accommodated by small changes to specification Length of sack is unimportant as long as sufficient Ullage is available to allow blades to operate and the top to form the correct shape. For plastic and difficult bags use the Total Bag Control System.