Hot Air Welding


Packages start at $225,000 usd MSRP
or $4,400/mo

Back-Seam Bag Sealing Machine

The PS300 back seam sealer was designed and built as a poly-woven bag sealing machine, specializing in sealing poly-woven and thermoplastic bags with great precision and speed. The back seam sealer machine forms and closes bags into a tube form with an overlap seal. This automated poly-woven bag sealer can be easily integrated into new or existing bag lines.

Best For:
  • Packaging
Seam Type:
  • Flat Seam Tube Flat Seam Tube
  • Fold Overlap Fold Overlap
  • Overlap Overlap
  • Tube Tube
Features & Option

Features & Benefits

  • Digitally controlled for quick production start-up
  • Servo controlled enabling synchronization with converting line
  • Precision folding system for clean- straight folds
  • Recipe management system for easy recall of different batches
  • Quick change folding system for size and type of fold
  • No glue, adhesives or hot melt
  • Can be custom designed to fit your specific applications

Optional Add Ons:

  • Grommet Machine
  • Ultrasonic Cutter


Technical Specifications

Power Requirements

  • 230 Volts - Three Phase - 40 Amp.
  • 480 Volts - Three Phase - 25 Amp.

Air Requirements

  • 30cfm @ 90psi

Power Consumption

  • Approx. 18kW

Maximum Temperature

  • 788˚C (1,450˚F)


  • Width: 1.52m (60")
  • Length: 3.1m (120") 
  • Height: 2m (78")


  • 1,200kg (2,650lb)

Seam Width

  • 25-38mm (1-1.5")

Welding Cycle

  • Up to 100 m/min (328ft/min)*

* Depending on the application, the seam width and the type of material used


Trust Miller Weldmaster to get your started!


Schedule Your Training

A Miller Weldmaster certified field service engineer will contact you to schedule installation and training at your facility.

Installation Preparation

We provide you with everything you need to know to get your team ready for installation and training.

Staff Training

Your staff will receive extensive instruction on welding equipment operation and maintenance and how to produce your product.

Machine Videos

  • Overview & How Tos
  • Training Videos
Back-Seam Bag Sealing Machine
Automated Back Seam Sealer for poly-woven and thermoplastic bags l PS300
Automated Poly-woven bag sealer - Easily integrate into your existing bag line l PS300

Service & Resolution Center

Our service team is dedicated to keeping our customer’s businesses running at optimal performance and assisting with any solutions you need. We are standing by to help you.

Contact Us Today!

Ready to get started or just have more questions for us? Simply fill out this form and we will be in touch with you shortly.