Induction Sealing — Flowtek Capping Systems
Induction Sealing Systems for Bottles & Containers
Induction sealers apply an electromagnetic field to fuse a foil liner inside the cap to the container opening—creating a tamper-evident, leak-resistant inner seal. Required for many chemical, personal care, and food products by retailers, regulations, or shipping standards.
How Induction Sealing Works
After capping, containers pass under an induction sealing head. The electromagnetic coil heats the foil liner bonded to the underside of the cap, melting it to the container's neck finish. No cap removal required; the seal is inside the threaded closure.
The process takes place in milliseconds, with the heat generated by electromagnetic induction causing the foil to fuse directly to the container's opening. This creates a permanent, tamper-evident seal that cannot be removed and resealed without visible evidence of tampering.
Capped Container Infeed
Bottles move on conveyor toward the induction sealing head; caps must be properly threaded and seated.
Electromagnetic Field Activation
The coil energizes when container reaches the sealing position, generating high-frequency magnetic field.
Foil Liner Fusion
Electromagnetic energy heats the aluminum or composite foil, melting it to the container neck finish.
Seal Verification & Advance
Optional seal check systems verify integrity; container advances down the line.
Ideal Applications
Solvents & Cleaners
Solvents, cleaners, preservatives, and industrial compounds requiring tamper-evident sealing for safety and regulatory compliance.
- Chemical Safety Compliance
- Hazmat Shipping Standards
- Anti-Counterfeiting
Detergents & Cleaners
Laundry detergent, fabric softener, bleach, and household cleaning products for retail shelf compliance.
- Retail Shelf Compliance
- Consumer Safety
- Leak Prevention
Cosmetics & Toiletries
Shampoos, lotions, creams, and body care products for retail and distribution chain tamper protection.
- Tamper Evidence
- Premium Packaging
- Quality Assurance
Premium Oils & Supplements
Oils, extracts, supplements, and specialty food products where leak resistance and tamper evidence are required.
- Leak Resistance
- Shelf Life Protection
- Authenticity
Technical Specifications & Configurations
| Specification | Details |
|---|---|
| Sealing Speed | Matches line speed; typically up to 300+ BPM in tunnel-style configurations |
| Container Neck Compatibility | Varies by neck finish and cap liner specification; typically 18mm to 120mm+ |
| Cap Liner Material | Aluminum foil, polyester foil, or composite liners; must be bonded to cap underside |
| Seal Verification | Integrated seal check systems available; pressure decay or visual inspection |
| Power | 110–240V depending on head size and line speed; 2–10 kW typical |
| Coil Life | Typically 2,000–5,000 sealing hours; field replaceable |
Tunnel Inline Systems
High-speed continuous sealing for production lines. Inline positioning after capping; synchronized with line conveyor speed up to 300+ BPM.
Flat-Cap Sealers
Specialty design for flat-topped or non-standard closures. Lower profile; optimized for cosmetic and household product packaging.
Bench-Top Semi-Automatic Units
Manual placement for batch QA, sampling, or smaller lines. Operator-controlled with adjustable dwell time and seal verification.
Integration Into Complete Packaging Lines
An induction sealer's real-world performance depends on everything around it. Cap specification, sealer positioning, line speed synchronization, and seal verification must all be engineered as a unified system. Flowtek designs and integrates induction sealing into complete, balanced packaging lines.
What we integrate around the induction sealer
- Upstream capping systems (chuck, ROPP, linear belt) properly torqued before sealing
- Cap supply and bowl-feed systems with oriented, liner-verified cap delivery
- Conveyor positioning and speed synchronization for consistent dwell time
- Seal integrity verification systems (pressure decay, high-voltage detection)
- Data logging, QA documentation, and SPC reporting for audit trails
- Downstream rejection and divert systems for failed seals
- Safety interlocks, guard systems, and electrical compliance
How we approach the integration
Induction sealing success depends on precision timing, proper cap specification, and downstream verification. We engineer each integration to ensure the sealer is positioned correctly after capping, synchronized with line speed, and equipped with seal check systems that meet your product's regulatory and retail requirements.
Documentation includes cap vendor qualification records, validated seal parameters per SKU, operator training materials, and maintenance reference guides—so the line is set up for stable operation from the first production shift.
Related Capping Technologies
Induction sealing is one step in a complete closure system. Here's where the other primary capping technologies fit.
Chuck Cappers
Precision threaded-closure capping to prepare containers for induction sealing. Delivers tight torque control on threaded closures.
View chuck cappers →Inspection Systems
Seal verification and integrity testing for quality assurance. Pressure decay, visual, and high-voltage detection methods confirm induction seal bond.
View inspection systems →Cap Handling Systems
Reliable cap supply ensuring consistent cap presentation upstream of sealing. Bowl feeders, vibratory sorters, and automatic orientation systems.
View cap handling systems →Need tamper-evident sealing for your product?
Tell us your container type, cap specification, required line speed, and compliance requirements. We'll confirm whether induction sealing is the right fit and outline a complete integration path including seal verification and QA data logging.