Heat Seal S.O.S. Thermo
Fin-Pak Bag Machinery

The H.G. Weber Thermo Fin-Pak Heat Seal S.O.S. bag machine consists of a Weber Variable Size bag machine and a Weber Heat Seal In-line Bottomer. The equipment is designed to produce impermeable heat sealed S.O.S. bags in a single machine line.

Variable Size Bag Machine
Bag formation starts on a modified Weber Variable Size S.O.S. bag machine. Paper is drawn through the laminator, which adheres a heat sealable plastic film line to the innermost paper ply. Prelaminated material may also be used. The web or webs advance to the web end, which slits the flaps and applies interply paste between webs. The drawrolls pull the web over the former, which forms the paper into a continuous gusseted tube. A heat seal bar is used to form the seam. Optional servo-driven drawrolls advance the tube to the cutoff station where the tube is cut to the desired length and is transferred to the scoring station, at which point two lateral creases are made across the tube. The tube proceeds to the opening cylinder where the bottom is formed. The tube, now with overlay bottom folds, is transferred to the Fin-Pak section.

Heat Seal In-line Bottomer Fin-Pak Section
The Fin-Pak section folds the bag face longitudinally the entire tube length, forming a vertical fin. A hot air nozzle and compression wheels are used to heat seal the bottom fin. A proportional heat control feature ensures that machine speed increases in proportion to sealing temperature. The bottom fin is then folded against the bag bottom, after which the bag is compressed and transferred to a lug conveyor positioned 90 degrees from the bag machine. A bag decelerator brings the bag to a controlled stop, dressing the bag for a lug conveyor pick-up. A motorized straight-through bypass feature aids in setup. This feature allows the operator to bypass the remainder of the machine line and focus on the bag machine and Fin-Pak section.

"T" Configuration Section
After bags are aligned on a lug conveyor, they are transferred to the "T" configuration transport belts. During "T" configuration, the bag bottom remains horizontal and the tube is transferred to a second 90 degree radius turning conveyor. Here the bag is spaced properly and turned to ensure proper bottom orientation for sealing. The standard U-shaped machine configuration allows for easy operator access to all machine sections.

Cross Seal Section
With both bottom flaps open and extended, belts transport bags through multiple hot air nozzles and compression wheels, forming heat seals across the bag bottom. These seals, along with the fin seal, form an "H" shaped seal in the bottom. The "H" shape assures minimal particle entrapment in the bag bottom. A proportional heat control feature ensures that machine speed increases in proportion to sealing temperature.

Bottom Forming and Delivery
The transport belts move the bag through flap cutting where the flaps are cut to the desired length. Two lateral creases are made across the bag bottom with rotary scoring discs. Bottom pasting is completed utilizing a multiple line hot melt bottom paste system. A belt fold method is used for bottom closing, completing the formation of a heat sealed S.O.S bag. The finished bag is then reoriented back to the horizontal position, transferred through a bottom compression unit and placed on a delivery table in shingle style format. A counter offers adjustable batch counts and maintains the total bag count. 

Additional ranges may be available upon request.
For more information, please contact us.