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Products > Plastic Bag-Making Accessories > Sealing Devices > Pre-sealing Devices

Pre-sealing Devices

Pre-sealing devices assist in the ultimate achievement of uniform seal formations by pre-sealing web regions which consist of additional layers. For example, side- or bottom-gusseted webs have regions of 2 layers and 4 layers. A pre-sealer can be used to pre-heat the four layer regions so that the final seal becomes homogenous.

A plethora of pre-sealing devices are available, including:

  • AC Servo & Pneumatic versions
  • Single and dual heat models
  • Side gusset pre-sealers
  • Bottom-gusset pre-sealers
  • Patch sealers
  • Tab sealers

Examples of such devices include:


MTRS Series Servo Pre-Sealer


Features of this model include:

  • Dual AC servo actuation, one for near-side and one for far-side sealing jaw pairs; each jaw pair can be individually enabled.
  • Pneumatically adjustable sealing pressure and secondary jaw retraction
  • Unparalleled performance
  • Extremely quiet and smooth operation
  • Sealing jaws can be rotated, thereby facilitating multiple uses, including:
    • Side gusset pre-sealer
    • Bottom gusset pre-sealer
    • Single or dual longitudinal sealers
    • Mitre sealer
  • Individual Teflon curtains for each jaw
  • Separate digital temperature control of each jaw
  • Full adjustability
  • Excellent accessibility to web and jaws
  • Fault diagnostic system, including alarm system for temperature deviation and faults.
  • Linear ball bushing mountings for width adjustment


SGP Series Side Gusset Presealer


Features of these devices include:

  • Independent pneumatic actuation of each sealing jaw
  • Four linear ball guides per sealing jaw, ensuring precise and rigid sealing action
  • Four sealing jaws, providing both top and bottom sealing action for each side of the web
  • Independent digital temperature controllers for each sealing jaw
  • Operator alarm system, for fault monitoring.
  • Teflon curtains fitted to each sealing jaw for operatorís convenience
  • Swappable sealing jaw profiles are optionally available


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