Heat sealers are used to seal products, packaging, and other thermoplastic materials using heat. This process involves melting the thermoplastic material and then fusing it together to create an airtight and watertight seal.

Replacement parts are often needed due to the exposure to heat, and melted plastic.

 

Equipment / Heat Sealer Parts

Equipment / Heat Sealer Parts

Heat sealing is one of the most common ways to close thermoplastic packaging because it creates a fused bond between layers of film. Over time, the consumable components that contact heat and molten plastic can wear, stretch, carbonise, or become contaminated. This category focuses on the core service parts that restore seal quality and uptime: PTFE (often called “Teflon”) cover materials and heating element wire for bench and pedestal-style sealers in common jaw lengths.

In practical terms, most sealing faults trace back to a small set of wear items: the non-stick PTFE layer that prevents film from adhering to the hot bar, and the resistance wire that generates heat. Replacing these parts at the right interval helps maintain consistent seal appearance, reduces rework, and lowers the risk of product damage caused by overheating or sticking.

Heat Sealer Parts — Helpful Guide

This guide explains the main part types in this collection, what they do, and how to match them to your sealer. It also links directly to the specific sizes listed on this page so you can confirm you’re selecting the correct length for your machine.

1) PTFE / “Teflon” cover materials (non-stick sealing surface)

PTFE cover materials sit between the heated sealing bar and the packaging film. Their job is to provide a smooth, non-stick surface so molten plastic doesn’t bond to the metal bar or the element wire. When PTFE is worn, you may see sticking, drag marks, wrinkling at the seal, or uneven gloss across the seal line.

• 200mm - Tefflon
  PTFE cover sized for 200mm seal bars. Useful when the sealing surface shows burn-through, tears, or adhesive contamination that can’t be cleaned away.
• 300mm - Tefflon
  PTFE cover sized for 300mm seal bars. Helps restore a smooth release surface and reduce film sticking during repeated cycles.
• 400mm - Tefflon
  PTFE cover sized for 400mm seal bars. Often replaced when seals become inconsistent due to hot spots caused by damaged cover material.
• 400mm - Tefflon - Pedestal
  PTFE cover intended for pedestal/foot-operated configurations using a 400mm sealing length.
• 600mm - Tefflon for Pedestal
  PTFE cover intended for pedestal/foot-operated configurations using a 600mm sealing length.

Typical symptoms of PTFE wear: film sticking to the bar, seal line showing scuffing or “drag”, brown/black marks on the seal area, or a seal that looks patchy even when temperature and dwell are unchanged.

2) Heating element wire (resistance wire that creates the seal)

Element wire is the resistive heating component used in many impulse-style sealers. When current passes through the wire, it heats rapidly for a short time (the “impulse”), melting the film layers at the seal interface. If the wire is stretched, nicked, oxidised, or broken, the sealer may fail to heat, heat unevenly, or produce weak seals.

• 200mm - Element Wire
  Pre-cut element wire for 200mm seal bars. A common replacement when the sealer no longer reaches sealing temperature or the seal is incomplete at one end.
• 300mm - Element Wire
  Pre-cut element wire for 300mm seal bars. Helps restore uniform heating across the full jaw length.
• 400mm - Element Wire
  Pre-cut element wire for 400mm seal bars. Often replaced alongside PTFE when seals show intermittent weak spots.
• 400mm - Element Wire - Pedestal
  Element wire intended for pedestal/foot-operated configurations using a 400mm sealing length.
• 600mm - Element Wire - Pedestal
  Element wire intended for pedestal/foot-operated configurations using a 600mm sealing length.
• Heat Sealer Element Wire - per metre
  Bulk element wire sold by length. Useful for maintenance teams who service multiple machines or need to cut custom lengths for specific bar designs.

Typical symptoms of element wire wear: no heat at all, heat only in sections, a seal that peels open easily, or a seal that requires unusually long dwell to close properly.

How heat sealing works (and why these parts matter)

Heat sealing relies on controlled energy transfer into thermoplastic films. The goal is to soften or melt the sealant layer (often polyethylene or similar) just enough that, under pressure, the layers fuse. After the heat pulse, the joint must cool under pressure to set. PTFE cover materials and element wire directly influence each stage:

• Energy delivery: element wire condition affects how evenly heat is generated across the jaw length.
• Release and surface finish: PTFE condition affects whether film releases cleanly and whether the seal line is smooth or scuffed.
• Consistency: worn consumables can cause operators to “chase settings” (increasing time/temperature), which may mask the real issue and increase scrap.

Case study: restoring seal quality with routine consumable replacement

A small packing line running mixed poly bags began seeing two issues: occasional pinhole leaks at the seal edge and film sticking to the bar during busy periods. Operators compensated by increasing dwell time, which reduced throughput and sometimes distorted thinner films.

During maintenance, the PTFE cover was found to be scored and contaminated with adhesive residue, and the element wire showed uneven tension. After replacing the PTFE cover and fitting a fresh element wire matched to the jaw length, the line returned to stable settings. Seal appearance became uniform, sticking stopped, and dwell time could be reduced back to the original range. The key takeaway: when settings drift over time, inspect consumables first before assuming the machine needs major repair.

How to choose the correct heat sealer parts

Step 1: Confirm your sealing length

Match the part length to the sealing bar length (for example 200mm, 300mm, 400mm, or 600mm). A mismatch can lead to incomplete heating coverage or installation issues. If your machine is a pedestal/foot-operated style, select the pedestal-specific items where listed.

Step 2: Identify your sealer type (bench vs pedestal)

Bench/hand-operated impulse sealers and pedestal/foot-operated sealers can use similar consumables, but mounting methods and lengths may differ. This collection separates standard PTFE and element wire items from pedestal-specific versions so you can choose the correct fit.

Step 3: Decide whether you need PTFE, element wire, or both

• Replace PTFE if film sticks, the cover is torn, or the seal line shows drag marks.
• Replace element wire if heating is intermittent, the wire is broken, or seals are weak despite correct settings.
• Replace both when the machine has been run with a damaged cover (wire may have been overheated or contaminated) or when you want to reset performance after extended use.

Step 4: Consider film type and operating conditions

Thicker films, laminated structures, and high-throughput cycles generally increase thermal load and can shorten consumable life. If you frequently seal dusty products, powders, or items that shed particles, contamination can build up on PTFE surfaces faster and may require more frequent replacement or cleaning.

Installation and maintenance tips (general guidance)

Always follow your machine’s manual and isolate power before servicing. The points below are general best practices for many impulse and pedestal sealers:

• Keep surfaces clean: wipe the sealing area when cool to remove residue that can imprint into seals.
• Maintain correct wire tension: element wire should be secure and evenly tensioned to avoid hot spots and premature breakage.
• Avoid over-temperature “compensation”: if you keep increasing time/temperature to get a seal, inspect PTFE and wire first.
• Check pressure alignment: uneven jaw pressure can mimic heating problems by creating weak areas along the seal.
• Inspect regularly: a quick visual check for PTFE scoring, burn marks, or wire discoloration can prevent downtime.

Troubleshooting common sealing problems

Film sticks to the sealing bar

Most often linked to worn or contaminated PTFE cover material. Replace the PTFE and clean any residue from the bar once cool. Also verify dwell time isn’t excessive for the film thickness.

Seal is weak or peels open

Check for uneven heating (element wire condition), insufficient dwell, contamination in the seal area, or inadequate cooling under pressure. If the wire is aged or heats inconsistently, replacement is typically the fastest fix.

Seal is incomplete at one end

This can indicate uneven pressure, a wire that is not heating uniformly, or a PTFE cover that is damaged at the edge. Confirm the correct length part is installed and that the jaw closes evenly across the full width.

Seal looks scorched or film shrinks excessively

Reduce dwell/temperature and inspect PTFE for burn-through. A damaged PTFE layer can create local hot spots that overheat the film. Also confirm the film structure is suitable for heat sealing at your chosen settings.

Frequently asked questions