Complete Guide to Heat Sealing Tape Selection for Packaging Equipment

Heat seal tape choice has a direct impact on seal quality, uptime, and jaw life on any packaging line running heat sealable films. This guide explains how PTFE heat sealing tapes work, the main tape families, and how to select the right construction for your jaws, films, and operating conditions.

Why Heat Sealing Tape Choice Matters

On form‑fill‑seal, flow‑wrap, tray sealing and pouch machines, PTFE heat seal tapes form the non‑stick, sacrificial interface between the hot metal jaw and the packaging film. When the tape is wrong for the application, you see symptoms like sticking film, inconsistent seals, carbon build‑up, and frequent tape changes.

Choosing a tape that matches your jaw design, temperature profile, and film type improves three things:

• Seal integrity and appearance.

• Time between tape changes.

• Protection of jaws, wires and coatings.

Backing Type and Thickness

Backing type drives the balance between release performance, wear life, and heat transfer:

• PTFE glass laminate: maximum durability and life, best for demanding, constant‑heat jaws.

• PTFE glass cloth: robust, dimensionally stable, general‑purpose release surface.

• Extruded PTFE film: thin, fast heat transfer, ideal for narrow elements and where rapid sealing is needed.

• Filled PTFE: ultimate wear life, suited to abrasive or high‑pressure seals.

Thickness matters because it directly affects:

• Wear resistance: thicker tapes handle more abrasion and occasional misalignment.

• Heat transfer: thinner tapes transfer heat faster, which can reduce required dwell time.

Typical heat seal tapes span from around 0.05 mm to over 0.3 mm (2–14 mil) overall thickness, depending on grade.

Adhesive Type – Silicone vs Acrylic

Adhesive choice is usually between silicone and acrylic systems.

Silicone adhesive:

• Temperature range typically around ‑73°C to 260°C.

• Best for constant‑heat jaws and applications where the tape runs hot for long periods.

• Offers clean release at high temperature but lower bond strength at room temperature than acrylic.

Acrylic adhesive:

• Temperature range on many heat sealing tapes up to around 177°C (350°F).

• Higher bond strength at lower temperatures, useful where tape tends to peel from cooler jaws or rollers.

• Suitable for lower‑temperature sealers or backing rollers, not for the hottest jaw positions.

If jaws run close to 250–260°C, silicone adhesive is usually the safe choice; for auxiliary positions under about 150–160°C where strong anchorage is required, acrylic may be preferred.

Jaw Design: Impulse vs Constant‑Heat

Impulse heat sealers:

• Use wires or ribbons that cycle from ambient to high temperature briefly, then cool between cycles.

• Often benefit from zone tapes to keep adhesive away from the wire and to prevent adhesive burn‑off.

• Thin extruded PTFE tapes can improve heat transfer, allowing faster cycles and more consistent seals.

Constant‑heat bars and jaws:

• Run continuously at a set temperature, often close to the tape’s upper rating.

• Require backings that resist creep and maintain their shape: PTFE glass cloth, laminate, or high‑modulus PTFE films.

• Premium or laminate tapes pay off where long life and stable release are more important than lowest initial cost.

Film Type, Temperature Window, and Pressure

The properties of your film drive the tape grade you should choose:

• Simple PE/PP mono‑layer films at moderate temperatures:

  • Primary or industrial PTFE glass cloth grades (e.g. SG25, SG35) often give a good balance of life and cost.

• Laminated snack films, high‑COF structures, or films with aggressive seal layers:

  • Benefit from higher PTFE loading and more robust backings (SG05, SG15, laminate Chemlam grades, or filled PTFE).

• High‑pressure seals on thick laminates or multi‑lane tooling:

  • Reward thicker backings or laminate/filled tapes that better resist wear and surface deformation.

Where sealing temperature is close to the minimum window of the film, fast heat transfer tape constructions can help ensure consistent seals without increasing dwell time.

Line Speed, Changeover Strategy, and Cost

Total cost of ownership is usually lower when tape life aligns with your planned downtime and cleaning intervals.

Consider:

• High‑speed, fully automated lines with expensive unplanned stops generally justify premium or laminate tapes.

• Lower speed or manual sealers may sensibly use primary or industrial grades, accepting more frequent tape changes.

A helpful internal metric is cost per 1,000 packs, factoring in tape cost, changeover time, and scrap rate; in many cases a higher‑grade tape wins once downtime and rejects are fully

Practical Application Scenarios

Vertical Form‑Fill‑Seal (VFFS) Baggers

Setup:

• Constant‑heat jaws sealing laminated films for dry foods or frozen products.

Tape selection considerations:

• Jaw cover: PTFE glass cloth tape, such as a primary grade similar to SG25, sized to the jaw width and pattern.

• If seals show sticking or tape wears quickly at the sealing face, consider a higher PTFE content or laminate grade.

BIL value‑add: supply rolls slit to the exact jaw width so operators only need to wrap and trim the ends.

Horizontal Flow‑Wrap

Setup:

• Constant‑heat crimp jaws sealing snack or bakery films at high speed, with rotating or reciprocating jaws.

Tape selection considerations:

• Use durable PTFE glass cloth or laminate tapes that resist scratching from film edges and product contamination.

• For very high speeds and high seal temperatures, filled PTFE tapes may extend life significantly.

Impulse Sealers and Bag Closers

Setup:

• Narrow impulse wires or ribbons, often sealing PE bags or liners.

Tape selection considerations:

• Use zone tapes so adhesive does not sit directly over the wire.

• Combine with thin extruded PTFE tape where fast heat transfer is needed.

This combination helps minimise adhesive burn‑off, keeps the wire clean, and improves seal consistency.

Tray and Blister Sealing Tools

Setup:

• Flat tooling plates or profiled seals, often sealing lidding films to trays or blisters.

Tape selection considerations:

• PTFE‑coated fabrics used as replaceable release sheets, sometimes with multiple layers in high‑pressure zones.

• Higher PTFE content and smoother surfaces provide better release for complex lidding films.

Installation and Maintenance Best Practice

Good tape selection only pays off if installation and maintenance are done correctly.

Recommended practices:

• Surface preparation:

  • Clean jaws thoroughly to remove old adhesive, carbon deposits and oil.

  • Use a suitable solvent such as isopropyl alcohol where compatible with the jaw coating.

• Application technique:

  • Apply tape under light, even tension; avoid stretching.

  • Avoid air bubbles and creases; press tape firmly to ensure full adhesive contact.

  • Position overlaps away from the main sealing line where possible.

• Inspection and changeout:

  • Check for pinholes, wear tracks, and edge lifting as part of routine checks.

  • Replace tape before it fails completely to avoid damage to jaws or sealing wires.

• Troubleshooting guide:

  • Adhesive residue on jaws: may indicate running above the adhesive’s rating or using acrylic instead of silicone on a hot bar.

  • Pinholes or burn‑through: backing too thin for the pressure/temperature, or excessive dwell time.

  • Tape shifting or curling: insufficient surface cleaning, wrong adhesive choice, or operating conditions outside the tape’s design window.