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D5417-21 – Standard Test Method Technical Guide
This standard practice, D5417-21, covers the equipment and operation of the Vettermann drum tester for testing pile yarn floor coverings to produce changes in appearance and color from mechanical action. It is applicable only for unused pile floor coverings, with inch-pound units as the standard. The acceptance criteria should be set by mutual agreement between purchaser and supplier.
📐 Apparatus Specifications
The Vettermann drum tester comprises a rotatable drum with a revolution counter, four adjustable retaining segments (thickness: 0.60 ± 0.03 in. or 15 ± 1 mm), and a free-running circular brush. A vulcanized fiber backing sheet (93.3 × 10.6 × 0.06 in. or 2320 × 270 × 1.5 mm) remains permanently in the drum. Key dimensions are:
| 🟦 Parameter | 📏 Inch-Pound | 📐 SI Equivalent |
|---|---|---|
| Internal Diameter | 28.70 ± 0.39 in. | 730 ± 10 mm |
| Internal Depth | 10.60 ± 0.20 in. | 270 ± 5 mm |
| Effective Depth | 9.40 ± 0.28 in. | 240 ± 7 mm |
| Thickness of Curved Surface | 0.31 ± 0.02 in. | 8 ± 0.5 mm |
| Retaining Segment Thickness | 0.60 ± 0.03 in. | 15 ± 1 mm |
The driving system operates at a speed of 1.65 rad/s (16 ± 1 rpm), with rotation direction reversed every five revolutions.
⚙️ Test Procedure and Operation
The test specimen is mounted in the drum with the pile surface toward the center, and edges are secured under the retaining segments. A steel ball with 14 rubber studs rolls randomly on the pile surface for a specified number of revolutions, simulating mechanical action. A free-running circular brush lightly contacts the surface, and loose fibers are continuously extracted by a vacuum cleaner. This practice is intended to bring about changes in texture and appearance of pile floor coverings, with acceptance criteria to be determined by mutual agreement between parties.
⚠️ Important: This practice is only applicable for testing unused pile yarn floor coverings. It is not suitable for used specimens.
💡 Technical Note: Ensure the vulcanized fiber backing sheet is properly positioned inside the drum for consistent results.
❓ Frequently Asked Questions
🔍 What is the purpose of the Vettermann drum tester?
It evaluates changes in texture, appearance, and color of pile yarn floor coverings due to mechanical action.
💡 Can this standard be used for testing used floor coverings?
No, it is specifically for unused pile floor coverings only.
⚡ What are the key operating parameters?
The drum rotates at 16 ± 1 rpm, reversing every five revolutions, and has an internal diameter of 28.70 ± 0.39 in.
📌 How is the specimen mounted?
The specimen is mounted with pile facing the center, edges under retaining segments, and a steel ball rolls freely inside.