ST-01SmoothnessTester
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ST-01 Smoothness Tester

The ST-01 Smoothness Tester is a highly accurate instrument designed to measure the surface smoothness of paper and board using the Bekk Method. It is specifically used to assess the smoothness of these materials.
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Introduction

The ST-01 Smoothness Tester is a highly accurate instrument designed to measure the surface smoothness of paper and board using the Bekk Method. It is specifically used to assess the smoothness of these materials.

Smoothness is a key metric that gauges the degree of surface irregularity on paper. It reflects how flat and smooth the surface of the paper is. In technical terms, smoothness refers to the time it takes for air to pass through a defined space between the test sample surface and a ring-shaped surface under controlled contact and pressure conditions. The time is measured in seconds (s). A longer time indicates better smoothness and a higher smoothness rating. In general, papers with higher smoothness levels produce better print quality, making smoothness an essential factor in achieving superior printing outcomes.

Bekk Smoothness:
The time in seconds required, under a set pressure difference, to pull a specific amount of air at atmospheric pressure between the surface of the test sample and a ring-shaped surface under predefined contact conditions.

Working Principle

 

A test sample of paper or board is placed on a glass plate and subjected to a specified pressure. A partial vacuum is then created, drawing atmospheric air across the contact surface. The time taken for a predetermined change in vacuum is measured.

 

Key Features and Benefits

Simple one-button operation with no need to set pressure or other variables, ensuring ease of use.
The use of a stepper motor and high-precision load sensor ensures smooth and impact-free pressing of the paper, providing highly accurate pressure (precision of 100±0.5kPa).
Note: Directly applying a weight or weight lever mechanism can damage the sample due to impact. Some automatic smoothness testers use a spring-based pressure mechanism, which can lead to inaccuracies over time due to spring fatigue. Additionally, pressure may vary depending on the sample's thickness.
Powered by a 32-bit ARM processor, the instrument boasts enhanced processing speed, delivering faster and more accurate calculation results.
A large, easy-to-use 7-inch color touch screen.
Precise airflow detection technology automatically identifies the correct range for the sample and switches as needed. It also adjusts the venting speed based on the sample's characteristics.
Built-in thermal micro printer for convenient data printing.
Equipped with imported, oil-free vacuum pumps that require no maintenance throughout their lifespan.

 

Standards

GB/T 456-2002: Paper and board - Determination of smoothness (Bekk method)
ISO 5627-1995: Paper and board - Determination of smoothness (Bekk method)
QB/T1665: Paper and board - Smoothness tester
TAPPI T479: Smoothness of paper (Bekk method)
TQD-01 Air Permeance Tester

 

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