PET Film with Thermal Adhesive
- Structure: PET carrier + thermal adhesive layer
- PET thickness: 25um, 50um, 75um, 100um, 125um
- Adhesive layer: 15um-50um
- Appearance: clear, white, matte, or tinted
- Format: master rolls, slit rolls, sheets
- Use: heat press bonding and industrial lamination
Protective Film Rolls Company is a manufacturer of PET Film with Thermal Adhesive for heat-activated bonding and industrial lamination. This film is not made for instant room-temperature sticking like pressure sensitive adhesive film. Before heat activation, the adhesive side is usually low-tack or non-tacky. During heat pressing, the PET carrier holds the thermal adhesive layer as it softens under controlled temperature, pressure, and dwell time. After cooling, peel strength and laminate stability can be checked on the actual substrate.
Product Overview
PET Film with Thermal Adhesive is used when a part needs clean positioning first and firm bonding only after heat activation. It can be aligned or layered before bonding because the adhesive side does not behave like a normal PSA surface. In a heated press, hot roller, or thermode process, the heat-activated layer softens, wets the target surface, and forms a controlled bond under pressure.
A typical trial window may start from 90C-140C activation temperature, 0.2-0.5MPa press pressure, and 5-20s dwell time. These are reference ranges only. Final settings should be confirmed by adhesive grade, substrate surface, equipment contact method, and bond-line thickness.
The structure combines a polyester film substrate, a thermal adhesive layer, and an optional release liner. Common PET thickness options include 25um, 50um, 75um, 100um, and 125um. The adhesive layer is often specified around 15um-50um for bonding strength and flow control. Some grades may use a thermoplastic hot melt adhesive film type as the bonding layer, but the finished material remains a PET-based functional film. It is selected for controlled thermal bonding, not PSA hand-pressure tack or PET/PE packaging heat seals.
Benefits
- Low-tack or non-tacky surface helps reduce accidental sticking during setup.
- Controlled temperature, pressure, dwell time, and cooling support repeatable bonding.
- PET carrier film improves dimensional support for thin overlays and insulation layers.
- Adhesive flow can be tuned to reduce edge overflow, squeeze marks, and uneven bond-line thickness.
- Optional liner supports clean unwinding, surface protection, and stable release.
- Sample trials can check peel strength after cooling, heat aging stability, substrate compatibility, retained-sample comparison, and repeat-order consistency.
How Should Heat Press Parameters Be Confirmed Before PET Film with Thermal Adhesive Is Approved?
Heat press parameters should be treated as a working bonding window, not as one fixed temperature. The activation temperature must soften the thermal adhesive layer enough to wet the substrate, while pressure should create uniform contact without pushing too much adhesive to the edge. Short dwell time may leave weak bonding; excessive time may cause PET shrinkage, surface marks, or squeeze-out. Trials should include temperature, pressure, dwell time, cooling, and surface cleanliness on the actual substrate.
TDS
Item | Typical Value |
Product structure | PET carrier film + thermal adhesive layer, optional release liner |
PET film thickness | 25um, 50um, 75um, 100um, 125um |
Thermal adhesive layer thickness | 15um-50um, confirmed by adhesive grade |
Total thickness | PET thickness + adhesive layer + liner if required |
Adhesive type reference | Heat-activated adhesive layer, thermoplastic hot melt adhesive film type by grade |
Room-temperature tack | Low-tack or non-tacky, not PSA instant bonding |
Activation temperature | 90C-140C typical reference range |
Press pressure | 0.2-0.5MPa typical reference range |
Dwell time | 5-20s typical reference range |
Peel strength after cooling | Tested by substrate, adhesive grade, and bonding condition |
PET dimensional stability | Checked after selected heat press window |
Adhesive flow control | Edge overflow, bond-line uniformity, and squeeze-out inspection |
Surface preparation | Substrate should be clean, dry, and free from oil or loose dust |
Roll format | Custom width, length, winding direction, and slit tolerance |
Sample approval | 180-degree peel test and retained sample review when suitable |
Applications
- Electronic insulation lamination requiring PET support and heat-activated bonding.
- Printed overlay bonding for panels, graphic layers, and durable surface assemblies.
- Nameplate and label heat mounting where room-temperature tack is not preferred.
- Membrane switch component lamination with controlled adhesive flow and flatness.
- FPC and electronic component auxiliary fixing under validated heat press conditions.
- Industrial laminate bonding for plastic, metal, coated film, or treated surfaces.
What Should Be Checked After Cooling to Verify Stable Thermal Bonding?
The final bond should be checked after the laminated part has cooled, not only when it leaves the press. Useful checks include peel strength after cooling, edge overflow, adhesive flow uniformity, PET dimensional stability, and bond-line stability after heat aging or handling simulation. For overlays, nameplates, insulation layers, and membrane switch parts, the review should confirm whether the PET carrier film remains flat and whether the adhesive transfers cleanly without local lifting.
FAQ
What is the difference between PET Film with Thermal Adhesive and PSA polyester film?
PSA polyester film sticks at room temperature with hand pressure. This heat-activated PET film needs heat, pressure, and dwell time, then develops bonding strength after cooling.
How do I choose the right activation temperature?
Start with the adhesive grade’s typical range, then test on the actual substrate. Surface finish, PET thickness, adhesive thickness, press type, and dwell time all affect the final setting.
How should peel strength be tested?
Peel strength should be tested after cooling. A 180-degree peel test can be used when suitable, but the method should match the substrate, press condition, and aging requirement.
Can this film be supplied in custom rolls?
Yes. PET thickness, adhesive thickness, roll width, roll length, liner choice, winding direction, and slit width can be adjusted after sample testing and process confirmation.
