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HDSA1721 System | Automatic HDSA1721

Product Overview

Complete system comes with a fully integrated infeed conveyor which transfers product to maximize employee productivity of this shrink packaging system. 

The automatic HDSA1721 L-Bar sealer is a pneumatic operated system complete with:

+  PLC with Color HMI Controls.

+  Closing Conveyor.

+  Wraps up to 25 Packages per Minute.

Finished with a matching T3417 shrink tunnel with digital temperature controls..

Feed the wrapper by hand or integrate a model IC1572 staging belted infeed conveyor or a model FIC1772 staging flighted conveyor, both with a variable speed drive.

Heavy duty air-operated automatic L-sealer for years of dependable service.

Siemens PLC control package provides complete touchscreen HMI control of package motion with Vertical and Horizontal sensors and closing conveyor.

Stored package settings make product changeover accurate and simple without tools – crank and scale settings, motorized seal height adjustment.

Digitally Controlled Hot knife seal bars work with Cross-Linked Polyolefin, PVC and Polyethylene films.

Interlocked Safety Guarding.

Optional Integrated Staging-Infeed Conveyors for higher throughput.

Seal area 17” x 21” x 5.5”H.


For a Product Demo contact the Heat Seal Industrial Sales Team, 800-342-6329 ext. 5

Machine Specs & Options

Max. Package Dimensions: 2.0” L Min. (5 cm L) with Optional Closing Conveyor, 2” - 16” W (5 - 41 cm W), .13” - 4.75” H (.3 - 12 cm H), 4.0” L Min. (10 cm L)
Film Capacity: 22” Center Folded, up to 44” with Optional Center Folder (55 cm) (110 cm)
L Bar Seal Area: 17” W x 21” L (45 W x 55 cm L)
Conveyor Speed: 70 ft./min. (21 m./min.)
Overall Dimensions: 72” L, 38” W, 60” H (183 L, 97 W, 152 cm H)
Working Adjustable: 32”- 36” H
Height: (81 - 91 cm H)
Power Requirements: 220VAC, Single Phase, 50/60 HZ, 8 A
Air Requirements: 2 cu.ft./min. @ 80 psi (.085 cu.m./min. @ 5.5 kg./
Net Weight: 1020 Lbs.

  • FIC-1772- 6' Flighted Infeed Conveyor, Variable Speed ico_question
  • Indexing Motion Profile With Stop Sensor (Option with Flighted Infeed Conveyors) ico_question
  • T-3417/8 LDR - 17" W x 8" H Chamber Opening, 220V 1 phase
  • Export Crating ico_question


  • Automatic L Sealer System running electrical products

    The automatic L sealer shrink tunnel combo system is shown running a variety of electrical parts.  The system includes infeed conveyor, automatic L sealer and shrink tunnel.

  • Automatic L Sealer with Variety of Products

    Heat Seal's Automatic L Sealer, Shrink Tunnel Combo System has horizontal and vertical eyes to detect different size packages, a closing conveyor to accept small packages, and automatically wraps up to 30 packages per minute.

  • Threading the Automatic L Sealer

    Threading the Automatic L Sealer

  • Automatic L Sealer running sandwiches

    See the automatic L sealer running sandwiches on an FDA approved infeed belt.

  • Auto L with Flighted Infeed three packs

    The Automatic L Bar Sealer shown with Flighted Infeed to collate products before sealing and shrinking package.

  • Automatic L Sealer running two pack egg cartons

    Our automatic L bar sealer HDSA1721 and T3417 shrink tunnel, running two packs of egg cartons.

  • Automatic L running lunch trays

    Heat Seal at Pack Expo 2013 Automatic L running lunch trays

General Questions

Application Data

Your Heat Seal sales rep may require an application data sheet and product samples for certain applications.  Please contact your Heat Seal rep for questions or concerns.



Film won't separate; Static or film collapses package

Off-centered seal

  • Adjust the package platform.
  • Loosen the knobs on the tension blocks.

Severe Ballooning

  • Increase the tunnel temperature
  • Check condition/position of air evacuation holes

Erratic Shrink

  • Make sure the tunnel is functioning properly
  • Slow down tunnel conveyor
  • Adjust the tunnel air flow
  • Increase tunnel chamber temperature

Burn holes (Hot spots)

  • Check the condition of the air evacuation holes
  • Speed up the tunnel conveyor
  • Decrease the tunnel chamber temperature

Dog ears

  • Use less film around the package
  • Slow down the tunnel conveyor
  • Check the condition of the air evacuation holes
  • Increase the tunnel temperature

Angel hair

  • Check and clean wire, wire insulation or knife blades
  • Check condition of sealing pads and Non-stick tape, change if necessary
  • Check for even arm and magnet pressure, make sure the magnets release at the same time
  • Check the minimum sealing temperatures
  • Check the seal cycles is complete
  • Check the condition of the air evacuation holes
  • Increase the sealing temperatures

Fish eyes

  • Make sure tunnel is functioning properly
  • Slow down tunnel conveyor
  • Use less film around the package
  • Increase the tunnel temperature

Crows feet

  • Slow down tunnel conveyor
  • Increase the tunnel chamber temperature

Film smokes excessively

  • Check and clean wire and wire insulation
  • Check and clean knife blade
  • Check condition of sealing pads
  • Check condition of Non-stick tape
  • Check for even arm and magnet pressure
  • Check the minimum sealing temperatures
  • Increase the sealing temperatures
  • Decrease the dwell time

Film splits at top of package

  • Check hole punch for proper alignment.
  • Check the condition of the punched holes.
  • Make sure the tunnel is functioning properly.
  • Speed up the tunnel conveyor.
  • Decrease the tunnel temperature.
  • Adjust the air flow.

Film splits at hole punch

  • Check hole punch for proper alignment.
  • Check the condition of the punched holes.

Film splits along centerfold


How to change elements of Hot Knife Seal Bars

  1. When replacing an old heater rod with a new heater rod assembly, the element should be removed as well as the cable assemblies going to the terminal block underneath the product tray.
  2. Removal of the cable assemblies from the arms will require disconnecting the rigid conduit and flex conduit from the seal arm assembly.
  3. To remove the element from the front seal bar, loosen the set screw and loosen the wire fasteners to slide out the element and cable assembly.
  4. Thermocouple wires require re-threading with the cable assembly of the elements.
  5. For the side seal bar, loosen the wire fasteners, set screw, bracket and the acorn nut to slide the element out. With the preceding steps complete, reassembly of the new elements, cable assemblies and thermocouple wires re-threading can begin.
  • NOTE: Tag the front seal bar and side seal bar wires and cables for reference.
  1. For re-assembly of the side element rod, insert rod into seal bar and tighten the set screw, reassemble seal bar to arm by re-tightening the acorn nut and wire fasteners. For the front heater rod, insert the rod into the seal bar and re-tighten the set screw and wire fasteners.
  2. With the side and front heater rods in place, the cable assemblies and thermocouple wires can be threaded into the rigid and flexible conduit.
    • NOTE: Re-thread thermocouple wires and cable assemblies simultaneously.
  3. With the front cable assembly and thermocouple wires inserted up to the elbow, re-thread the side wires through the ½ inch hole on the elbow. Then re-thread all thermocouple wires through the flexible conduit.
  4. After all the cable assemblies and wires are through the flexible conduit, reinsert into the control housing and reconnect to the terminal block.

How to adjust the Heavy Duty Seal Arm

  • BEFORE YOU BEGIN  Make sure to disconnect air if present and electrical power to the machine before adjusting the sealing arm. Then remove the covers covering the arm shaft. Loosen the clevises for the air cylinders from the arm shaft.
  1. Adjust the arm springs so the arm just opens and stays in the open position by:
    • Putting a lever arm in the hole in the arm shaft that is at least 24 inches long.
    • Pull the lever towards the front of the machine to close the arm.
  2. While holding the lever tightly, loosen the 3/4” nuts on the arm casting. (Requires two people)
  3. To increase the opening force, rotate the arm shaft with the lever in the direction that will close the arm.Re-tighten the 3/4” nuts on the arm castings. Torque to 35 lb. per ft.
  4. Adjust the open stop to the desired maximum open position.
  5. Make sure the arm is all the way open and the cylinder fully retracted.
  6. Check that the cylinder is perpendicular to the arm shaft, then tighten the clevis on the shaft.
  7. Verify that the arm will easily close all the way. Do this by carefully pulling the arm down (the air should still be disconnected). If the arm feels smooth all the way down to the arm’s sealing position and there is less than 2 3/4 inches of the shaft extending out from the cylinder, then the arm is ok.
  8. If the arm will not close all the way, the maximum open position will need to be decreased. Loosen the cylinder clevis (see item 3) on the shaft, decrease the maximum position by changing the open stop, and repeat the procedure from the “adjust open stop” step listed above.