Sealing Machines
Introduction
Equipment used to create a hermetic seal on packaging, containers, or products to protect contents from contamination, moisture, or tampering, and to preserve freshness.
Types of Products:
- Heat Sealers: Use heat and pressure to melt and bond thermoplastic materials.
- Impulse Sealers: Apply heat for a short pulse, then cool under pressure.
- Constant Heat Sealers: Maintain continuous heat.
- Band Sealers: Continuous sealing for higher volume.
- L-Bar Sealers: For shrink wrapping.
- Pouch Sealers: For sealing pre-made pouches.
- Induction Sealers: Use electromagnetic induction to create a non-contact seal (often for bottle caps with foil liners).
- Vacuum Sealers: Remove air before sealing, preserving perishables.
- Bag Sealers: Specifically for sealing plastic bags.
- Tray Sealers: For sealing trays with film.
- Blister/Clamshell Sealers: For sealing blister packs.
Applications, Technology in Various Industries:
- Food & Beverage: Packaging snacks, coffee, frozen meals, fresh produce, liquids.
- Pharmaceuticals: Sealing sterile products, blister packs, tamper-evident seals.
- Cosmetics: Packaging creams, lotions.
- Chemicals: Sealing hazardous materials, industrial products.
- Electronics: Protecting sensitive components from moisture.
- Medical Devices: Sterile packaging.
Material Selection Considerations
- Sealing Jaws/Bars: Aluminum with Teflon coating for non-stick properties and even heat distribution.
- Heating Elements: Nichrome wire or similar resistance heating alloys.
- Frame: Stainless steel (especially for food/pharma) or powder-coated steel for durability and hygiene.
- Conveyor Belts: Food-grade materials (PU, PVC), heat-resistant materials.
- Vacuum Components: High-quality pumps, robust hoses, and chambers (stainless steel, durable plastics).
- Gaskets/Seals: Silicone, EPDM, or other temperature-resistant elastomers for vacuum sealers.
