Natro Tech’s in-line sealing systems are engineered to increase the productivity without modifications at the customer’s site. It has a limited physical space of only 3 to 5 metres in length and comes in two versions: 1800 bags/hour or 2400 bags/h. This sealing system is suitable for industrial paper bags with an external sealing valve.

The on-board sealing system is designed so that it can be installed on older and newer machinery, e.g. air or impeller packers. The system consists of two parts: the ultrasonic sealing unit and the discharging system.



  • In-line sealing system
  • On-board sealing system



Machinery Specifications

  In-line sealing system On-board sealing system

Valve Size


from 90 to 200mm


from 90 to 200mm




1800 or 2400 bags/h


100 to 240 bags/h


Valve type



External sealing valve


External sealing valve


Machine dimensions



From 3 to 5 m in length


Filling machine dimension


Ultrasonic sealing specification



20 kHz or 30 kHz


20 kHz or 30 kHz



Sealing Systems are suitable for the following industries:

  • Building and construction
  • Food
  • Pet food & Pet care
  • Farming and agriculture
  • Chemicals and dangerous goods
  • Electronics
  • Glassware and ceramics

Related products

Air packers

Developed to filling granular or powdery products at high speed into valve bags.

Bag applicators

Bags can be placed onto the filling spout conveniently through an automatic bag applicator.

Impeller packers

Developed for filling very fine powdery products (<3 mm) at high speed into valve bags.

High capacity palletisers

Meeting the need of high output production.

Medium capacity palletisers

Great flexibility to satisfy all requirements.

Low capacity palletisers

Ideal for medium and low production output.

Sealing systems

Offering in-line sealing systems and on-board sealing systems

Weighing systems

Various types of weighing systems for optimized productivity, providing various types of statistics.