Sealing Machines

Sealing methods, and what decides between them

Continuous band sealing (bags and film) — Bags and pouches pass between heated bands that crimp the open end closed — the standard route for poly bags, laminate pouches and expanded-food packaging, with optional date or lot printing at the seal.
Induction foil sealing (bottle and jar mouths) — An electromagnetic head bonds an aluminium-foil liner inside the closure to the container rim, giving a tamper-evident, leak-resistant seal — applied after capping, on plastic and glass containers.
Tube, tray, cup and box sealing — Tube filling-and-sealing, tray lidding, cup/can top sealing and carton tape sealing follow their own package logic. We source these subtypes through our supply network — ask with the package construction and we will specify against it.

The deciding inputs are the package construction (film layers, foil thickness, tray or tube material), the seal width and integrity requirement, the container or bag dimensions, and the throughput expressed in bags per minute or sealing speed in m/min. Our longer guides cover the trade-offs:

Sealing parameter windows: temperature, pressure and dwell by material

Every heat-seal is a balance of three variables — temperature, jaw pressure and dwell time — against the material's own sealing window. Setting one without the other two is why "the sealer runs but the seal fails" reports rarely have a single cause. The material-side window we check first:

PE films — the most forgiving sealant; wide window, but thin PE needs lower temperature and even pressure or it burns through.
PP and oriented PP — narrower window than PE; laminated OPP usually seals through a sealant layer, not the OPP itself.
Polyester (PET) outer layers — do not heat-seal by themselves; the sealant underneath does the work, so jaw temperature follows the laminate, not the print web.
Aluminium foil laminates — seal well but tolerate no pressure unevenness; foil creases become leak paths.
Aluminized (VMPET) composites — the metallised layer degrades above its window; the published horizontal baggers name PE/OPP/PET and aluminized composite films, which sets the material scope on those machines.
Paper-composite bags — the paper layer does not seal; the inner laminate does, and jaw pressure must bite through the paper without crushing the seal.
Tube shoulders and laminated tubes — folding-seal stations close metal tubes by folding and crimping, not heat; the published tube filling-and-sealing machine is that method.
Induction liners — foil-sealed caps need a compatible liner and the right power-vs-speed match; the liner and the machine are a system, per our induction sealing guide.

On the machine side, the published figures set the frame: our continuous band sealer states a 0–300 °C temperature range, a 6–15 mm seal width and 0–12 m/min of sealing speed — numbers that describe capability, not a setting recipe. Settings per material are established at commissioning against your actual packaging and recorded per product. We do not publish setting tables per film grade, because a setting without your material batch, jaw condition and dwell is a guess; our band vs impulse sealer comparison covers the method-level choice instead.

Maintenance and changeover on this family

Sealing machines are the family where a worn part shows up directly as a leak. The maintenance and spares guide carries the routine; family specifics:

Seal-band and jaw-face wear — band sealers consume PTFE bands and heating blocks on a meter-run basis; they are consumables, and a second set belongs next to the machine from day one.
Temperature uniformity — a drift in one heating block shows as one-sided weak seals; thermocouples and heating elements are the first checks.
Pressure flatness — crimp wheels and jaw springs lose evenness with wear; a seal-width check across the bag catches it.
Changeover scope — a bag-size change on band sealers is height and guide adjustment; on horizontal bagging machines it includes belt and clamp settings. We confirm the adjustment list per model.
Induction head upkeep — water-cooled heads and power supply health drive seal consistency; cooling-system checks belong in the daily routine on induction sealers.
Settings discipline — temperature, speed and pressure recorded per packaging material; a returning product should re-call a recipe, not re-tune a machine.

Published sealing machines

Every sealing machine in this list is published on its own model page — the list grows as models clear the catalogue gate. The band sealer and induction sealer additionally show their sourced parameter figures inline:

ZONESUN FR-770 Continuous Band Sealer — a continuous band sealer for plastic bags: sealing speed 0–12 m/min, sealing width 6–15 mm, temperature range 0–300 °C, published from $288.
ZONESUN ZS-FK6000A Continuous Electromagnetic Induction Sealer — a continuous electromagnetic induction sealer for foil liners on bottles: seal diameter Phi20 - Phi80mm, Bottle height 20–280 mm, sealing speed 0–10 m/min, published from $679.20.

All figures come from each machine's own parameter table — open the model page for the full specification and its source conditions. Sealing speed is conditional on material, temperature and package geometry, so treat any catalogue speed as a comparison point, not a guaranteed output; seal quality is proven on your package, not on the supplier's test sample.

What we need to quote a sealer

Package construction (film layers, foil thickness, tray material)
Seal width and integrity requirement
Container or bag dimensions
Target throughput

Scope, limits and what stays unconfirmed

Film, tray, foil, tube and product conditions determine the sealing method and the tests needed before purchase.

When this applies

Your package is a bag, film-lidded tray, foil-sealed bottle or tube, and you know its construction.
Seal integrity (leak path, peel strength, induction foil compatibility) is a purchase criterion.
Throughput is expressed in bags per minute or sealing speed in m/min.

Limits

Published sealing speed is conditional on material, temperature and package geometry.
Seal quality is proven on your package, not on the supplier's test sample.

What you get

A sealing-method recommendation with the material assumptions stated
A material compatibility question set for the supplier
A seal-test acceptance checklist to attach to the purchase contract

Verified so far

Two sealing models are published: a continuous band sealer (speed, power, dimensions sourced; published price $288) and an induction sealer (cap size, container range, power, dimensions and price $679.20 sourced).

Still unconfirmed

No owner-confirmed seal-integrity data exists for this family; acceptance is by your package trial.
Lead time for both models is a quotation item.

Confirm before quoting

Film, tray, foil or tube construction must be confirmed.
Seal-surface and contact requirements are application-specific.
Seal integrity must be verified on the production package.

Buyer question

Do published sealing speeds prove seal quality? No. Speed is conditional on material, temperature and package geometry.

Supply through own production plus outsourcing

PackHub fulfils sealing requirements through own production plus a vetted outsourcing network, so the family is not capped by a single factory floor. Band sealers, induction sealers, tube sealing and tray-lidding solutions are all quotable; whichever factory builds it, PackHub stays the one counterparty for specification verification, pre-shipment inspection and export.