Falling Ball Viscometer

1. Overview

Viscosity is a key parameter representing internal friction in fluid materials and is critical in adhesive preparation and mixing processes. Accurate viscosity monitoring helps stabilize production, ensure product consistency, reduce material waste, and optimize energy consumption.

Common measurement methods include viscosity cups, rotational viscometers, falling-body methods, and plate methods. Among them, the falling ball viscometer is widely used in industrial adhesive systems due to its simple principle and suitability for online or semi-online control.

2. Working Principle

The falling ball viscometer measures adhesive viscosity by recording the time required for a standard ball to fall through the adhesive.

Under fixed conditions of distance, weight, and ball size, the falling speed depends on the internal resistance of the adhesive. Higher viscosity results in longer falling time, while lower viscosity leads to shorter falling time.

When the measured time exceeds the preset limit, the system automatically opens a pneumatic valve to add solvent. Solvent addition stops once the viscosity returns to the set range, ensuring continuous and stable viscosity control.

3. Main Components

1. Standard falling ball
2. Pneumatic lifting cylinder
3. Mounting rod
4. Falling ball connecting rod
5. Level indicator
6. Mounting base
7. Detection sensor

4. Precautions

a. Flush the viscometer with solvent after operation to prevent adhesive residue from curing and affecting ball movement.

b. Ensure vertical installation to avoid measurement errors caused by uneven falling forces.

5. Advantages

The falling ball viscometer operates on the same principle as viscosity cup testing but offers automated measurement. It reduces operator exposure to irritating adhesive fumes, improves workplace conditions, and provides more stable and consistent viscosity control.