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Training Manual — Section 8

Production Quality Control

The complete production QC reference — pre-production, inline, end-line, FRI, defect categories, QC tools, and production SOP.

Contents

01Pre-Production (PP) Control02Inline Quality Control03End-Line Quality Control04Final Random Inspection (FRI)05Production Defect Categories06Quality Control Tools07Production Quality SOP08Sampling & AQL Governance09CAPA & Escalation Control10Quality Data & Process Capability
Section 01

Pre-Production (PP) Control

Quality control activities before bulk production begins.

Key Activities

  • PP meeting
  • PP sample approval
  • Fabric & trims inspection
  • Pattern verification
  • Marker approval

Quality Checkpoints

  • Fabric test report approved
  • Shrinkage verified
  • Color fastness approved
  • Trims matching garment color
  • PP sample signed by buyer

Common Issues

  • Wrong fabric shade
  • Incorrect trims
  • Pattern mismatch
  • PP sample not aligned with bulk
Section 02

Inline Quality Control

Inline Quality Control

Quality control during the sewing line process.

Key Activities

  • Line feeding inspection
  • First output inspection
  • Hourly audit
  • Defect tracking
  • Operator training

Quality Checkpoints

  • Seam strength
  • Stitch density
  • Panel alignment
  • Measurement control
  • No skipped stitches

Common Issues

  • Puckering
  • Open seams
  • Wrong stitch tension
  • Wrong attachment method
Section 03

End-Line Quality Control

End-Line Quality Control

Full inspection of finished garments at line end.

Key Activities

  • 100% inspection
  • Defect classification
  • Rework management
  • Final measurement check
  • Visual appearance check

Quality Checkpoints

  • No stains
  • No wrinkles
  • No loose threads
  • Correct measurements
  • Correct labels

Common Issues

  • Dirty marks
  • Wrong folding
  • Wrong label placement
  • Measurement out of tolerance
Section 04

Final Random Inspection (FRI)

Final Random Inspection (FRI)

Statistical final inspection using AQL sampling levels.

AQL 1.5AQL 2.5AQL 4.0

Key Activities

  • Appearance
  • Construction
  • Functionality
  • Measurements
  • Packing

Quality Checkpoints

  • Correct sampling
  • Correct defect classification
  • Pass/Fail decision
  • Buyer standard compliance

Common Issues

  • Wrong AQL level
  • Incorrect sampling
  • Misclassification of defects
Section 05

Production Defect Categories

Production Defect Categories

Classification of production defects by severity.

Defect Categories

Critical Defects

  • • Safety issues
  • • Broken needles inside garment
  • • Wrong size label
  • • Major open seam

Major Defects

  • • Visible stains
  • • Wrong measurement
  • • Broken stitches
  • • Poor seam strength

Minor Defects

  • • Loose threads
  • • Small puckering
  • • Slight misalignment
Section 06

Quality Control Tools

Core analytical tools used to track and resolve quality issues.

Core Tools

  • AQL
  • Defect mapping
  • Inline defect chart
  • Root cause analysis
  • 5 Why analysis
  • Fishbone diagram

Quality Checkpoints

  • Correct documentation
  • Correct defect coding
  • Correct reporting
  • Correct corrective action
Section 07

Production Quality SOP

The controlled quality sequence from product readiness through shipment release.

SOP Flow

1. Risk review and PP meeting2. Approved sample and specification release3. First-piece approval4. Inline process audits5. End-line inspection6. Finishing and packing audit7. Final random inspection8. CAPA closure and shipment release

Quality Checkpoints

  • Current controlled documents at point of use
  • Inspectors trained and calibrated
  • Daily reports reconcile checked, defective, repaired, and passed quantities
  • Only authorized quality personnel release held goods
Section 08

Sampling & AQL Governance

Statistical inspection decisions require defined lot formation, random selection, inspection level, sample size, and acceptance numbers.

Key Activities

  • Define homogeneous lot and lot size
  • Select general or special inspection level
  • Determine code letter and sample size
  • Select cartons and pieces randomly across the lot
  • Count critical, major, and minor defects separately
  • Apply Ac/Re values without unauthorized averaging

Quality Checkpoints

  • Use buyer-approved ISO 2859-1 / ANSI-ASQ Z1.4 plan
  • Critical defects follow the specified zero-tolerance rule
  • Reworked failed lots receive controlled reinspection

Common Issues

  • Convenience sampling
  • Mixed incomplete lots
  • Wrong defect unit
  • Incorrect Ac/Re interpretation
Section 09

CAPA & Escalation Control

Quality failures are contained immediately, investigated with evidence, corrected at source, and prevented from recurring.

Key Activities

  • Stop and segregate affected work
  • Trace machine, operator, bundle, material lot, and time window
  • Verify root cause using 5 Why, fishbone, and process evidence
  • Implement correction and systemic corrective action
  • Validate effectiveness through follow-up audits
  • Share learning across lines and similar styles

Quality Checkpoints

  • Owner and due date assigned
  • Root cause is causal rather than descriptive
  • Effectiveness evidence closes the action

Common Issues

  • Repair used as corrective action
  • Operator blamed without process analysis
  • Actions closed without verification
Section 10

Quality Data & Process Capability

Consistent defect codes and denominators convert inspection records into actionable process intelligence.

Core Tools

  • DHU and defect rate
  • First-pass yield
  • Right-first-time rate
  • Pareto analysis
  • Defect heatmap
  • Control chart
  • Measurement trend
  • Repair and rejection cost

Quality Checkpoints

  • Define defect, defective unit, opportunity, and denominator
  • Trend by operation, line, style, shift, machine, and operator
  • Escalate special-cause variation before final inspection

Continue your training

Review garment testing standards or explore the full module library.

Garment testing

Advanced reference

Technical controls & troubleshooting

Control Plan

  • Link each operation to CTQ characteristics, method, frequency, sample size, and reaction plan
  • Approve first output after every style, operator, machine, folder, or setting change
  • Use traffic-light escalation based on DHU, defect recurrence, and critical-risk triggers
  • Track defects by operation, operator, machine, hour, size, shade, and root cause
  • Verify rework independently and prevent repaired pieces from bypassing inspection
  • Stop and contain production when safety or recurring systemic defects exceed limits

AQL & Sampling

  • Use ISO 2859-1 / ANSI ASQ Z1.4 where required by the buyer
  • Select inspection level, lot size, code letter, sample size, and AQL before drawing samples
  • Draw samples randomly across cartons, colours, sizes, and production periods
  • Treat critical-defect acceptance as zero unless an explicit standard states otherwise
  • Do not average defects across separate lots or conceal repeated defects by re-sorting
  • Record actual inspected quantity, defect count, accept/reject numbers, and disposition

Process Controls

  • Verify production quality at incoming, first-output, inline, end-line, and final stages
  • Separate critical, major, and minor defects using the approved defect library
  • Use risk-based sampling; increase frequency after a failure or process change
  • Maintain shade, size, lot, roll, and bundle traceability throughout production
  • Quarantine nonconforming output until disposition and corrective action are approved
  • Confirm corrective action effectiveness on consecutive production checks

Corrective Action

  • Contain affected quality output and identify the last verified-good checkpoint
  • Use 5 Why and fishbone analysis across material, machine, method, people, and environment
  • Compare failed output with the sealed sample, specification, and machine settings
  • Correct the root cause rather than relying on repeated inspection or repair
  • Run a controlled trial, validate results, then release the updated process setting
  • Update SOP, control plan, training record, and preventive-maintenance requirement

Written by Sanjeewa Dehiwalage — www.nosk.life — All rights reserved.

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