Paper smoothness meter
This article presents paper smoothness testers, essential tools for assessing the surface finish of paper, film, and foil. By measuring airflow resistance, these devices quantify how smooth a material is, critical for applications requiring ink adhesion, printability, and lamination.
Applicable Standards
The tester adheres to global benchmarks:
ISO: ISO 5627 (Paper/board), ISO 8791-2 (Plastic Film)
TAPPI: T 555 om-21 (Bendtsen Smoothness)
GB/T: GB/T 456 (Paper/board)
Main Parameters
| Parameter | Specification |
|---|---|
| Test Pressure | 100 kPa (Standard) |
| Measurement Range | 0-5000 Sheffield Units |
| Vacuum Degree | ≥90 kPa |
| Test Area | 10 cm² (Adjustable) |
| Repeatability | ≤1% |
Working Principle
The tester measures air leakage between the sample and a glass plate under controlled pressure. Higher leakage indicates lower smoothness. Results are expressed in Sheffield Units (ml/min).
Test Principle
Sample Placement: Secure the material on the glass plate.
Vacuum Application: Apply vacuum to draw air through the sample-plate gap.
Flow Rate Measurement: Calculate leakage rate to determine smoothness.
Applications
Used in paper mills, printing houses, and packaging labs, the tester ensures materials meet surface quality standards for coatings, printing, and conversions. Compliance with ISO/TAPPI methods ensures reliable data for quality control and process optimization.
This guide provides technical insights to support informed decisions when selecting or operating paper smoothness testers, ensuring accurate surface quality evaluation.