Co-Extrusion Layer Ratio Verification Sheet

Inspection template for verifying individual layer percentages and total structure on a multi-layer co-extrusion line against the job specification, including customer-required barrier and seal layers.

Inspection Details

• Job number matches the production order
  Enter the job number and confirm it matches the active production order or traveler.
• Product name and structure code confirmed
  Record the product name, structure code, or customer part number being verified.
• Line, die, and run date/time recorded
  Document the co-extrusion line identifier, die set, and verification timestamp.

Job Spec and Material Match

• Approved job specification available at point of use
• Total layer structure matches the approved spec
  Confirm the number of layers and the specified structure order match the customer or internal specification.
• Resin/material grade for each layer matches the spec
  Select any layer materials that were verified against the approved formulation or bill of materials.
• Target layer ratio setpoints entered correctly
  Verify the control recipe or setpoints reflect the approved target percentages for each layer.

Layer Percentage Verification

• Layer 1 percentage within acceptable tolerance
  Record the measured percentage for the first layer and compare it to the approved target.
• Barrier layer percentage within acceptable tolerance
  Record the measured barrier layer percentage and confirm it meets the customer structure requirement.
• Seal layer percentage within acceptable tolerance
  Record the measured seal layer percentage and confirm it meets the customer structure requirement.
• Other specified layer percentages within acceptable tolerance
  Use this field for any additional layer percentage verification required by the job spec.
• Total structure percentage equals 100%
  Confirm the total of all verified layer percentages equals the approved total structure.

Line Setup and Process Controls

• Extruder feed rates match target ratios
  Verify each extruder feed rate or output setting is aligned to the approved layer ratio targets.
• Melt temperatures within approved operating window
  Record the melt temperature used for the run and confirm it is within the approved process window.
• Die and feedblock configuration matches the structure
  Confirm the installed die/feedblock configuration matches the layer sequence and customer structure.
• Process alarms or deviations reviewed
  Confirm any active alarms, deviations, or adjustments were reviewed and documented before release.

Release and Attestation

• Non-conformances documented and contained
  Record any deficiency, hold action, scrap, or rework disposition if the structure did not match the job spec.
• Product released for production or shipment
  Confirm release only after the verified structure meets the approved specification.
• Inspector signature
  Inspector attestation that the verification was completed accurately.