1. The Thermal Limit: Why Not Just Heat Transfer?
To understand the process, we must first understand the physics of the fiber. Polyester (PET) is robust. It loves heat. The standard Sublimation (Heat Transfer) process relies on heating disperse dyes to 200°C - 230°C. It is efficient, fast, and dry.
Nylon (Polyamide), however, is sensitive. High-end swimwear typically contains 15% - 30% Spandex. Subjecting high-stretch Nylon to 220°C often leads to embrittlement and yellowing.
The Verdict
Polyester is "Baked" (Dry). Nylon must be "Steamed" (Wet). To preserve the buttery-soft hand feel of Nylon while ensuring deep color penetration, we must abandon the shortcut of heat transfer.
2. The Complexity Gap: 5 Steps vs. 9 Steps
The barrier to entry for Nylon printing is significantly higher than Polyester. Here is the comparative breakdown of our production line:
| Step | Polyester (Dry) | Nylon (Wet / Acid) | Notes |
|---|---|---|---|
| 01 | Color Matching | Color Matching | Precise pH management. |
| 02 | - | Relaxing (松布) | Release knitting tension. |
| 03 | - | Pre-coating (上浆) | Chemical paste application. |
| 04 | Paper Print | Direct Printing | Kyocera/Epson heads. |
| 05 | Heat Transfer | Steaming (蒸化) | 102°C Ionic Bonding. |
| 06 | - | Washing (水洗) | Removing residue. |
| 07 | - | Stentering (定型) | Heat-setting width. |
Air-Sculpt 34™
Engineered specifically for the 9-step Acid Process. Semi-dull yarn maximizes paste absorption.
View Fabric Specs →3. Decoding "The Black Box": Why Washing Matters?
Among the 9 steps, Step 06: Washing is the secret to the "Premium Feel." In Acid Printing, the fabric is saturated with chemical paste and excess dye. If a factory cuts corners here to save water, you get the "Sticky Feel" and poor color fastness.
The FORALL Standard: We treat Washing as a purification ritual. By rigorously removing 100% of the paste and floating ink, we restore the Nylon to its natural state.
4. The 100x Barrier: Capital & Compliance
Why is high-quality Acid Printing so rare? It comes down to an astronomical gap in investment.
A. The Hardware Gap
- Low-End Sublimation: Standard paper printers (<$5,000).
- FORALL Sublimation: Industrial transfer printers (~$50,000).
- Acid Direct (The Crown Jewel): Industrial Direct-to-Fabric printer with Epson Heads costs approx. $500,000 USD (¥3.6 Million) per unit. It demands a dust-free environment.
B. The "Hidden" Costs: The License Gap
Buying the printer is just step one. Because Acid Printing involves washing, it requires strict Water Pollution Discharge Permits (COD Indicators).
We operate within a certified Government Chemical Industrial Park. In today's regulatory environment, this environmental license is often scarcer and more valuable than the machinery itself.
Supply Chain Security
When you work with FORALL, you are working with a fully licensed, compliant industrial entity. You are buying Stability.
Conclusion
If your brand positioning is "Fast Fashion," Polyester is a valid choice. But if your brand stands for Performance and Luxury Touch, there is no shortcut. Nylon + Acid Digital Printing is the only protocol that respects the athlete's skin.