TROUBLESHOOTING OF INDUCTION SEALING DEFECTS

SYMPTOM                                         POSSIBLE CAUSE

No Seal                                          • Wrong material selection for heat seal application

                                                       • Insufficient application torque & Pressure

                     • Product Contamination on the container land

                                                       • Capping Problem

                                                       • Induction unit malfunction

                                                       • Induction unit set-up faults

Partial Seal                                   • Insufficient application torque & pressure across land area

                                   • Dimensional Mismatch between closure and container

                                                       • Product/ Moisture on container land seal

                                                       • Insufficient energy setting on induction unit

                                                       • Incorrect head coil position not uniform

                                                       • Capping problem

                                                          • Off centre liner alignment

                                                       • Uneven Container land area

High Removal Torque                • Excessive application torque

                                                      • Material back bonding closure

                                                      • Incomplete wax absorption / wax burning

                                                      • Excessive energy setting, holding time causing melting

                                                      • Oversize cut edge

Low Removal Torque                 • Insufficient application torque

                                                      • Container finish melts down

                                                      • Dimensional conflict between closure and container

                                                      • Excessive dwell time within induction field

Incomplete Wax Absorption            • Insufficient energy setting

                                                            • Insufficient dwell time within induction field

                                                            • Incorrect head coil position

                                                            • Product fills temperature

                                                            • Hot melt adhesive failure

                                                            • Product in contact with foil

                                                            • Coil too narrow for closure diameter & undersized foil

Foil Corrosion                                 • Wrong material for application

                                                          • Excessive energy setting

                                                          • Excessive dwell time within induction field

                                                          • Product on container land area

Back Bonding to Closure                • Excessive energy setting

                                                          • Incorrect backing for application

                                                          • Melt point conflict between back and closure

Induction Sealing Process Flow:

Examples of Induction Sealing wads:

For HDPE containers

For ALL containers

Liner Selection Criteria

Critical Induction Heat Seal Parameters