Product Description

The SUNAURA continuous induction foil sealer for glass jars is a desktop, air-cooled induction sealer optimized for food and cosmetic filling operations that have outgrown handheld sealers. The sealed cabinet houses a 1500W high-frequency power stage, and a short but sturdy desktop belt conveyor extends from the worktop. One operator feeds capped jars onto the belt at the left end; sealed jars exit on the right ready for labeling or boxing.

The sealing head height is adjusted by a handwheel — no tools needed when you switch between a 30 mm dropper bottle and a 70 mm honey jar. The painted steel chassis and aluminum-alloy head are built for daily production use in a food packing environment, and the air-cooled design means no water hookup, no chiller, and minimal maintenance. Sealing diameter covers Φ20–50 mm at belt speeds up to 10 m/min, with bottle heights from 40 to 200 mm.

This is the sweet spot for small-batch honey producers, jam makers, spice blenders, and cream jar packers who need consistent, repeatable seals without the capital cost or floor space of a full inline line. Every unit is 48-hour run-tested before shipment and ships with full CE documentation.

Technical Specifications

Key Features & Benefits

• Desktop form factor fits a standard packing bench: The entire sealer and conveyor occupies roughly 1.15 m of bench length — no floor-standing frame, no dedicated installation crew required.
• Purpose-built for glass jar mouths: The sealing head geometry and power curve are tuned for glass jar rims, where heat must penetrate thicker cap walls and heavier foil liners.
• Handwheel height adjustment: Raise or lower the head in seconds between product runs — no spanners, no shims, no downtime when switching from a small dropper bottle to a cream jar.
• Air-cooled, low maintenance: Integrated fan cooling removes the water supply and chiller from the equation. Clean the fan filter quarterly and the machine runs for years.
• Adjustable belt speed for dwell-time tuning: Slow the belt down for viscous products that need a longer cool-down, or speed it up for high-turnover SKUs — all from one dial.
• Robust painted chassis with aluminum-alloy head: Powder-coated steel cabinet resists food-area cleaning chemicals; the machined aluminum head stays flat and true through years of daily use.
• 1-year warranty on core electronics: The transistor generator, control board, and sealing head coil are covered for 12 months from shipment, with lifetime support beyond that.

Application Industries

Container compatibility: Glass jars, PET jars, HDPE tubs, and small glass bottles with mouth diameters from 20 to 50 mm. Not suitable for metal containers.

How Induction Foil Sealing Works

Induction sealing bonds a foil disc to the container mouth using electromagnetic energy — no rollers, no glue, no contact. On this desktop glass jar sealer, the cycle is:

1. Capped glass jar moves under the sealing head. The operator places a capped, foil-lined jar onto the left end of the belt. The conveyor carries it beneath the RF head centered by side guides.
2. High-frequency field heats the aluminum foil. The 1500W transistor generator produces an alternating magnetic field that passes through the cap and induces eddy currents in the aluminum foil layer, heating it within fractions of a second.
3. Wax absorbs into pulp, film bonds to glass. Heat melts the wax layer, which wicks into the pulp board inside the cap. Simultaneously, the heat-activated polymer film on the foil underside melts and fuses to the glass jar rim.
4. Jar exits — foil seal remains on rim. When the end customer unscrews the lid, the pulp disc stays in the cap, leaving the aluminum foil bonded to the glass mouth as a visible, tamper-evident, hermetic seal.
5. Cooling on the belt. The jar continues along the short conveyor, where ambient air cools the sealed film to its full bond strength before the jar reaches the operator’s collection tray.

Is This Desktop Glass Jar Sealer Right for You?

This model is the right upgrade if you are outgrowing a handheld induction sealer but are not ready for a full inline system. Check the four criteria below:

1. You currently hand-seal glass jars and need to speed up: If a handheld wand takes 2–3 seconds per jar and you are sealing hundreds per day, this desktop model removes the manual step entirely — one operator loads, another collects.
2. Cap diameters between Φ20 and Φ50 mm: This head covers standard honey jars (38–48 mm), jam jars, cream jars, and small spice jars. If you run wide-mouth jars over 60 mm, look at our inline wide-head models instead.
3. You need a self-contained benchtop unit: No floor space, no power upgrade beyond a standard wall socket, no water supply. The machine sits on your existing packing bench and starts producing within an hour of delivery.
4. Throughput under ~100 jars/min: At 10 m/min belt speed with typical 43 mm honey jar spacing, expect 60–100 jars per minute. If you need 200+ jars/min on a continuous line, step up to the 2000W floor-standing model.

Troubleshooting Guide — Common Issues & Solutions

Glass jars have slightly different sealing behavior than plastic bottles — thicker walls, heavier liners, and higher fragility. Below are the issues our engineers see most often on glass jar lines, with practical fixes. Always disconnect power before inspecting the head.

For persistent glass jar sealing issues, send photos of the failed seal (top view and cross-section) to [email protected] — we can often tell whether it is a liner, power, or alignment problem from the foil pattern itself.

Frequently Asked Questions

Related Induction Sealers

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Continuous Induction Foil Sealer for Bottles and Jars

Online Induction Sealing Machine for Small Jars

Large-Head Continuous Induction Sealer (30–150mm)

Browse the full range on the induction sealing machines landing page. Also explore our carton sealers and liquid filling machines for complete packaging lines.