What Is “Peel” in DTF?

Process Definition

In DTF printing, Peel refers to the action of removing the PET carrier film after the heat transfer process has been completed.

It occurs:

  • After printing
  • After powder curing
  • After heat pressing
  • During the release stage

Peel is a post-transfer release operation, not part of the printing stage.

What Determines Peel Type?

Classification Principle

In DTF printing, Peel refers to the action of removing the PET carrier film after the heat transfer process has been Peel types are defined solely by:

The timing of film removal relative to the cooling curve after heat pressing.

Peel classification does NOT describe:

  • Print quality
  • Surface category
  • Durability level
  • Softness level
  • Film thickness

It only describes:

Release timing position.

Cooling Curve Model

Thermal Positioning Concept

After pressing, the system follows this cooling sequence:

Heat Press (High Temperature)
↓
Powder Melt (Flow State)
↓
Cooling Phase
↓
Solidification
↓
Film Removal (Peel)

Peel timing refers to the moment at which the film is removed within this cooling curve.

Types of DTF Peel

Instant Hot Peel

Definition:
Film is removed immediately after the press opens (approximately 0–3 seconds).

Thermal State:
Surface remains near peak press temperature.

Process Characteristic:
No waiting period before peeling.

Some modern films support instant hot peel, allowing the carrier film to be removed immediately.

Hot Peel

Definition:
Film is removed after a short delay (approximately 5–10 seconds).

Thermal State:
Still hot but slightly reduced from peak temperature.

Process Characteristic:
Brief pause before peeling.

Hot peel refers to removing the transfer film immediately after pressing.
See a detailed explanation in Hot Peel vs Warm Peel in DTF Printing.

Warm Peel

Definition:
Film is removed during partial cooling (approximately 10–20 seconds).

Thermal State:
Noticeably cooled but not fully solidified.

Process Characteristic:
Moderate waiting time before peeling.

Cold Peel

Definition:
Film is removed only after full cooling (30 seconds or more).

Thermal State:
Near room temperature.

Process Characteristic:
Complete cooling before peeling.

Another common workflow is cold peel, where the film is removed only after the transfer has cooled.

Surface Finish Clarification

Matte System Explanation

In standard DTF systems:

The final transferred surface belongs to the matte category.

Different peel timings:

  • Do not change surface type
  • Do not create glossy PU-style finish
  • Do not convert matte to mirror gloss

They may only create:

Minor gloss variation within the matte spectrum.

This variation results from:

  • Differences in cooling stage
  • Micro-surface structure formation
  • Light scattering differences

However:

All peel types remain within the matte surface system.

Peel timing may also influence surface appearance, which is discussed in How Peel Time Affects Surface Finish.

What Peel Type Does Not Determine

Peel classification alone does not determine:

  • Wash resistance
  • Stretch performance
  • Adhesion strength
  • Powder chemistry
  • Ink saturation

Those factors depend on overall system compatibility and process control.