Hot melt adhesive film temperature is not one number. Across our grades, the press windows run from 80–110 °C for ZF-5180 up to 160–200 °C for ZF-6235 (176–392 °F overall), all at 0.1–0.4 MPa, with dwell times between 5 and 20 seconds. The press setting is a platen temperature, not the film’s melting point: heat has to pass through the substrate before the glue line flows, which is why a bond can fail at a temperature that looks high enough on paper.
Hot melt adhesive film settings at a glance
This guide covers adhesive film bonded in a heat press. Glue sticks and hot melt melted in a gun or tank work differently; the FAQ below explains the difference. For the basics of how film lamination works, see adhesive film lamination.
Hot Melt Adhesive Film Temperature Starts From the Grade, Not a Universal Number
The answer depends on the grade first and the substrate second. Windows differ so much between grades that a setting that bonds one grade cleanly will barely soften another.
The reference table below lists the same data with dwell time. Treat every value as a sample starting point, not a guaranteed production setting.
| Grade | Base | Melting point | Press temperature | Dwell |
|---|---|---|---|---|
| ZF-5180 | TPU | 75–80 °C | 80–110 °C | 5–20 s |
| ZF-1682 | Modified TPU | 65 °C | 90–110 °C | 5–12 s |
| ZF-7325 | TPU | 75–80 °C | 110–130 °C | 5–20 s |
| ZF-7608 | TPU | 85 °C | 110–130 °C | 10–20 s |
| ZF-4200 | TPU + resin | 100 °C | 120–150 °C | 5–15 s |
| ZF-8026 | TPU | 80–85 °C | 120–140 °C | 10–20 s |
| ZF-6238 | TPU | 95–100 °C | 120–140 °C | 5–20 s |
| ZF-8816 | PES | 110–120 °C | 140–160 °C | 10–15 s |
| ZF-8815 | TPU | 120–130 °C | 140–180 °C | 8–20 s |
| ZF-6235 | TPU | 95–100 °C | 160–200 °C | 10–20 s |
Pressure is the same for every grade: 0.1–0.4 MPa, which is 1–4 bar, about 1.0–4.1 kgf/cm² or 15–58 psi. Set the press within this range to start. The same setting can behave differently from one part to another: on a pneumatic press the gauge shows the air pressure in the cylinder, and the force it produces is spread over the area being bonded (pressure on the part = gauge reading × cylinder bore area ÷ bonded area), so a full garment panel receives much less pressure than a small patch at the same setting. Judge pressure by the result: full contact across the part, with no adhesive showing through the face. For a large platen, a roller line or an unusual part size, send the press type and part dimensions through the request a quote page and we will confirm a starting setting with you. The substrates each grade suits, widths and liner options sit on the product pages for TPU hot melt adhesive film, PES hot melt adhesive film and low-temperature TPU film.
Why the Press Setting Sits Above the Melting Point
A melting point describes the film, while a press temperature describes the hot plate, so one cannot stand in for the other.
When the press closes, heat has to travel from the platen, through whatever layer sits between the platen and the film, and into the glue line. Fabric, leather and foam all slow that heat down. The film only bonds once the glue line itself is hot enough to flow and wet both surfaces, and that has to happen within the dwell time.
In our reference data, the bottom of each press window sits between 0 and 60 °C above the top of the listed melting point. ZF-5180 has no gap at all (melting point up to 80 °C, window from 80 °C). ZF-8815 starts 10 °C above; ZF-4200, ZF-6238 and ZF-8816 start 20 °C above; ZF-1682, ZF-7608, ZF-7325 and ZF-8026 fall between 25 and 35 °C; ZF-6235 starts 60 °C above. Because the gap varies this much between grades, use each grade’s published window rather than adding a fixed offset to a melting point from another supplier’s datasheet.
The practical rule: if a bond fails at a temperature just above the melting point, the glue line most likely did not reach flow temperature. Check heat transfer before blaming the film, and check the platen itself: a contact thermometer or temperature strip on the platen surface often reads differently from the press display.
How much heat the finished bond can take in use is a different question from the press setting. If the part will see heat in service, ask for test data on your own build.
Temperature, Pressure and Dwell Time Work as One Window
The three settings are linked. A lower temperature can still bond if dwell is longer, because the glue line has more time to catch up with the platen. Higher pressure improves contact, and with it heat transfer, but it cannot replace heat. On porous fabrics, too much pressure pushes melted adhesive into the substrate instead of leaving it at the interface.
- Dwell time is usually the safest lever when the bond is weak. Lengthening dwell inside the grade’s range, in steps of about 5 s, lets heat reach the film without raising the platen setting. It costs cycle time, and a heat-sensitive face can still glaze with longer contact, so watch the face as dwell increases.
- Temperature comes next. Move in steps of about 10 °C and stay inside the window; going above it risks scorching, glazing or liner damage before the bond improves.
- Pressure is for contact. Use enough to close gaps across the whole part. If the adhesive starts showing through the face fabric, pressure is usually the first thing to reduce.
Film thickness matters as well. A thicker film needs more heat to melt through, so it usually sits further up the dwell range than a thin one of the same grade.
How the Substrate Changes Where You Start
Where you land inside the window depends on the materials on either side of the film.
When the two layers fall into different cases below, take the temperature limit from the more heat-sensitive layer and the pressure from the layer that is easiest to crush or stretch, then make up the difference with dwell, staying inside the grade’s dwell range and watching the knit for stiffness. For example, a polyester knit bonded to PU synthetic leather starts low in the window with low pressure: the knit is a stretch fabric and the PU coating is heat-sensitive. If the first bond is weak, lengthen dwell before raising temperature.
Heat-sensitive face fabrics
Thin knits, Lycra blends and coated synthetics can shine, shrink or change color before a high-window grade is fully melted. Start at the bottom of the window, extend dwell before adding heat, and if the face still marks, move to a lower-window grade such as ZF-5180 or ZF-1682 instead of running a high-window grade below its range.
Thick, foam or insulating layers
Every millimeter between the platen and the film delays heating at the glue line. If the press heats from one side, place the thinner layer against the heated platen where the build allows. Expect to need the upper half of the dwell range. Raising temperature alone mostly overheats the outer surface.
Metal parts and low-energy surfaces
Metal behaves differently from fabric: it pulls heat away from the glue line, and a thick metal part can keep the film below flow temperature even when the platen is hot. Expect to need the upper part of the dwell range, or warm the part before pressing. Low-energy plastics, coatings and silicone-finished surfaces are the opposite case. There the limit is usually wetting rather than heat, so clean, dry surfaces and even pressure do more than extra temperature. Our reference data lists ZF-1682 for special metals and low-energy surfaces and ZF-4200 for plastic and metal; see hot melt adhesive film for plastic-to-metal bonding for those builds.
Stretch fabrics
Lay elastic knits flat and without tension. Fabric pressed while stretched springs back after cooling and can pucker or lift the bond. Open knit structures also let melted adhesive sink in and stiffen the bond line, so keep pressure toward the low end and avoid dwell beyond what the bond needs. If you are still choosing the film itself, how to choose TPU hot melt adhesive film covers selection first.
A First Trial in Nine Presses
You do not need dozens of samples to find a usable setting. Nine presses inside the grade’s window usually show where the bond starts to work.
- Fix pressure at one value inside 0.1–0.4 MPa (mid-range is a reasonable start; lower for open or stretch fabrics) and keep it there for the whole trial.
- If the film is on a release liner, tack it to the first substrate at the bottom of the window with the shortest dwell that holds it in place, let it cool and peel the liner. Run the nine presses on the second, final press, which is where the bond forms.
- Pick three temperatures: the bottom, middle and top of the grade’s window. For ZF-7608 that is 110, 120 and 130 °C.
- Pick three dwell times across the grade’s range. For ZF-7608: 10, 15 and 20 s.
- Press one sample per combination, using the real production materials and the same layup each time. Mark each sample.
- Let every sample cool to room temperature before judging it. A hot melt bond is weak while it is still warm, and some bonds keep gaining strength for a while after cooling, so the final check is made after 24 hours (see below).
- Peel each sample by hand and look at where it failed, not only how hard it was to pull.
The failure surface tells you what to change:
- Adhesive failure (adhesive stays on one side, the other side is clean): the film did not wet that surface. Add dwell, then temperature, or check that surface for silicone, finishes or moisture.
- Cohesive failure (adhesive splits and remains on both sides): the bond formed. Strength now depends on the grade and the build, not on more heat.
- Substrate failure (the material tears before the bond): the bond is stronger than the material.
Find the lowest temperature and shortest dwell that give cohesive or substrate failure. Set production one step above that edge (the next temperature or dwell up) so normal platen and batch variation does not drop you below it, then confirm the production setting on three fresh samples: peel two once they have cooled, and peel the third only after it has rested for 24 hours. If the part will be washed, run your wash test before release. If that edge is already the top of the window, a lower-window grade is the better fix. Confirm on the production machine. For a measured result, follow the method in our peel strength test guide; T-peel methods such as ISO 11339 and ASTM D1876 apply when both bonded layers are flexible.
Symptom, Likely Setting Cause, What to Change
When a bond fails after the first trial, change one setting at a time and re-press. The table points to the setting most often involved; the linked guides go deeper into causes that are not about settings.
| What you see | Likely setting cause | What to change first |
|---|---|---|
| Film peels away clean from one side | Glue line too cold, or poor contact on that side | Longer dwell, then a higher temperature inside the window; check surface condition |
| Adhesive shows through the face fabric, stiff hand | Too much pressure, heat or dwell for an open fabric | Lower pressure first, then shorten dwell |
| Bubbles or blisters in the bond | Trapped air or moisture, uneven pressure | Pressure evenness and material moisture; see why film bubbles |
| Face fabric shines, shrinks or changes color | Platen too hot for that fabric | Bottom of the window with longer dwell, or a lower-window grade |
| Edges lift after cooling | Edges received less heat or pressure, or the substrate is shrinking or springing back after pressing | Make sure the platen covers past the part edge; let parts cool flat |
| Bond separates later in use or after washing | Marginal bond from the start, or a grade and material mismatch | Re-run the nine-press trial; see why laminated fabric delaminates |
| Liner is hard to remove or marks the film | Liner type not suited to the temperature used | Compare liner options in release paper vs PET release film |
FAQ
If you are working out settings for a new build, VELNORA can suggest a starting grade from the substrate pair and your equipment. Send the layer structure and press type through the request a quote page to ask for a sample roll or a quote.
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