Automation Solution Engineering
SPM · HYDRAULIC · PNEUMATIC · CONVEYOR · PANELS
After filling, the pack must be closed properly. A weak seal or loose cap means leakage, spoilage and customer complaints. Sealing and capping machines close the pack using heat, pressure, vacuum or torque. This guide explains the main types, what each is used for and how to choose, as part of a complete packaging line.
| Machine | Closes | Method |
|---|---|---|
| Pouch heat sealer (impulse) | Plastic pouches and bags | Heated jaws melt the film for a short time |
| Continuous band sealer | Pouches moving on a conveyor | Bands carry the pouch through heating and cooling |
| Tray / cup sealer | Trays, cups and containers | Lid film heat-sealed onto the rim |
| Vacuum sealer | Pouches and trays | Air is removed, then the pack is sealed |
| Capping machine | Bottles and jars | Screw, press-on or ROPP caps fitted with set torque |
| Carton sealing machine | Cartons and cases | Tape or glue closes flaps |
| Strapping machine | Bundles and cartons | Plastic strap tensioned and welded |
A good heat seal needs the correct temperature, pressure and dwell time for the film. Too hot or too long weakens or burns the film; too cool or too short gives a weak seal. Product caught in the seal area is a common cause of leaks, so fillers should keep the pack mouth clean.
Vacuum machines remove air to slow spoilage and reduce pack size. The chamber type, vacuum level and sealing time depend on the product and film. Powders need controlled vacuum so they are not drawn out.
Screw capping machines turn the cap to a set torque so caps are tight but not damaged. Press-on caps use a vertical force. Cap feeders orient and deliver caps to the capping head. Missing or crooked caps can be detected with a sensor or camera.
Even good machines can make a bad seal occasionally. Inline checks include visual inspection with a camera, vacuum or pressure based leak checks and torque checks on caps. Learn more in our guides to leak test machines and vision inspection.
Automation Solution Engineering builds sealing and capping machines, with conveyors and control panels, to match your pack and output. Pair a sealer with a filling machine and checking station for a complete line. Share your pack details and target packs per minute for a proposal.
Common types are pouch impulse heat sealers, continuous band sealers, tray and cup sealers, vacuum sealers, carton sealing machines and strapping machines. Bottles and jars are closed with capping machines.
The usual causes are wrong temperature, pressure or dwell time for the film, and product trapped in the seal area. Worn or dirty sealing jaws can also cause weak or uneven seals.
Inline checks include camera inspection, vacuum or pressure leak checks and cap torque checks, with a reject mechanism that removes failed packs automatically.
Send the pack type, film or container material, size range, packs per minute and any vacuum or gas requirements. You can call or WhatsApp 8867148793.