Bag Sealing
Browse bag sealing machines.
Choosing bag sealing machinery for flexible packs
The correct sealer is determined by the packaging material, seal area, product, production method and finished-pack acceptance test.
Start with the film structure and filled-bag condition
Bag sealing cannot be specified reliably from bag width alone. Provide the complete laminate or film specification, thickness, sealant layer, gussets, zipper or valve details, bag size range and the condition of the seal area after filling. Powders, oils, product fragments, folds and trapped air can all affect the result. The filled pack may also need support so its weight does not pull on the hot seal while it is being formed or cooled.
Compare the sealing method with the operating pattern
| Sealing route | Useful starting condition | Points to verify |
|---|---|---|
| Bar or impulse sealer | Intermittent manual or semi-automatic sealing where the bag can be positioned in a fixed jaw. | Jaw length, material, seal time, cooling, operator loading and repeatability. |
| Continuous band sealer | Filled bags can travel consistently through heated and cooling bands. | Bag support, line height, speed, seal position, tracking and coding requirements. |
| Vacuum sealer | Air removal and a sealed chamber process are part of the pack requirement. | Product behaviour, chamber size, bag compatibility, liquid migration and cycle sequence. |
| Form-fill-seal process | The bag is formed from film and sealed as part of an integrated filling machine. | Film tracking, forming set, dosing interface, seal contamination and cut-off. |
Define seal acceptance before comparing machines
Temperature, pressure and dwell time interact with material, contamination and cooling. A machine setting is not a universal seal specification. Agree the visible requirements and any strength, leak or integrity test relevant to the product and distribution route. Record the test method, conditioning time and sample preparation so results can be repeated.
For continuous production, review the upstream filler, discharge height, bag spacing and the way the operator presents the top of the bag. Downstream coding, checkweighing, metal detection or case packing may affect conveyor height and pack orientation. If the product is dosed directly into film, review vertical form-fill-seal machinery and pouch and bag application guidance.