The Trinity of Heat Pressing: Time, Temperature & Pressure
Applying custom transfers cannot be replicated with a household iron. In commercial apparel factories, transfer adhesion is a precise thermodynamic science requiring three simultaneous controls:
1. Temperature Precision: If the platen drops by even 10°C, the hot-melt TPU adhesive fails to liquefy, leading to print wash-off after 2 cycles. If it overheats by 10°C, cotton fibers can scorch and yellow.
2. Pneumatic Pressure: High pneumatic pressure (5 bars) is mandatory to physically force the liquefied TPU polymer deep into the interstitial spaces between cotton yarn fibers.
3. Moisture Pre-Pressing: Natural cotton stores up to 8% atmospheric humidity. Pressing the bare garment for 5 seconds before applying the graphic vaporizes trapped steam that would otherwise blister the transfer.
