Seal Bar Profile and Pressure Verification Inspection

Inspection template for verifying seal bar temperature uniformity and pressure across the bar width to prevent weak, incomplete, or channeled seals on bags and pouches.

Inspection Setup and Equipment Identification

• Seal bar identification matches the equipment being inspected
  Verify machine ID, seal bar location, and line or station match the inspection record.
• Product format and seal specification are available at the point of inspection
  Check that the current bag or pouch specification, seal width, and target settings are available to the inspector.
• Seal bar and surrounding area are clean and free of residue
  Inspect the bar face, jaws, and adjacent surfaces for film residue, product buildup, or debris that could affect heat transfer or pressure.
• Inspection tools are available and calibrated if applicable
  Confirm availability of temperature probe, pressure indicator, feeler gauge, or other approved verification tools.
• Equipment is in normal operating condition before verification
  Confirm the machine is at operating temperature and ready for verification per SOP or work instruction.

Seal Bar Temperature Uniformity

• Left end seal bar temperature is within acceptable range
  Record the measured temperature at the left end of the seal bar.
• Center seal bar temperature is within acceptable range
  Record the measured temperature at the center of the seal bar.
• Right end seal bar temperature is within acceptable range
  Record the measured temperature at the right end of the seal bar.
• Temperature variation across seal bar width is within limit
  Record the maximum observed temperature difference across the bar width.
• Temperature controller and display are stable during verification
  Verify the controller is not drifting, cycling abnormally, or showing fault indications during the check.

Seal Bar Pressure Profile

• Left end seal pressure is within acceptable range
  Record the measured pressure or force at the left end of the seal bar.
• Center seal pressure is within acceptable range
  Record the measured pressure or force at the center of the seal bar.
• Right end seal pressure is within acceptable range
  Record the measured pressure or force at the right end of the seal bar.
• Pressure variation across seal bar width is within limit
  Record the maximum observed pressure difference across the bar width.
• Seal bar closes evenly without visible tilt, gap, or binding
  Observe the closing action for uneven contact, misalignment, or mechanical interference across the bar width.

Seal Surface Condition and Alignment

• Seal face is free of nicks, gouges, warping, or worn coating
  Inspect the seal surface for damage that could create channels, weak seals, or inconsistent pressure transfer.
• Seal bar alignment is within specification
  Verify the upper and lower sealing surfaces are aligned and contact evenly across the full width.
• Padding, silicone, or release material is intact and properly seated
  Check that any cushioning or release material is not torn, compressed, missing, or shifted.
• Seal bar hardware is secure and free of abnormal looseness
  Inspect fasteners, mounts, and linkage for looseness that could affect pressure profile or alignment.

Seal Quality Verification

• Test seal sample shows no visible channeling, wrinkles, or incomplete seal area
  Inspect a representative sealed bag or pouch for uniform seal appearance and absence of channels or gaps.
• Seal integrity test result is acceptable
  Record whether the seal passed the approved integrity check, such as peel, burst, or leak verification per SOP.
• Corrective action documented for any out-of-specification condition
  If any temperature, pressure, alignment, or seal quality issue is found, document the corrective action and disposition of affected product.