HUATAO Conical refiner discs to boost your efficiency

Material

Features and Applications

Stainless steel series

For example, 304 and 316 have good corrosion resistance and are used in some corrosive slurries or in situations with high hygiene requirements.

Alloy steel series

After special heat treatment (such as quenching and carburizing), it has extremely high surface hardness and good wear resistance, making it the most commonly used material.

Bimetallic Composite

The matrix is made of tough steel, with the tooth surfaces overlaid or inlaid with ultra-hard wear-resistant alloys (such as tungsten carbide), combining strength and wear resistance for a long service life.

Ceramic/Engineering Ceramics

Possesses extremely high hardness and wear resistance, but is brittle, suitable for specialty papers requiring high purity and low iron contamination.

Parameter

Description

Hardness

Wear resistance typically refers to the surface hardness of the gear teeth, expressed using Rockwell hardness. This is a core indicator for measuring wear resistance; alloy steel grinding discs typically have a Rockwell hardness of HRC 50-65, while tungsten carbide coatings can exceed HRC 70.

Mechanical Strength

Ensuring no fracture under high speed and high load typically refers to tensile strength and impact toughness.

Wear-resistant layer thickness

For bimetallic grinding discs, the effective thickness of the wear-resistant alloy layer on the surface determines the number of repairs and the total lifespan.

Parameter

Description

Pattern design

①Straight teeth: The simplest type, with a straight fiber flow path and strong cutting effect.

②Herringbone/Oblique teeth: More common, they increase fiber residence time in the grinding zone, promote fiber separation and buffing, and result in better pulping quality.

③Wave teeth/Honeycomb teeth: Specially designed to optimize energy distribution and fiber handling.

④Strip teeth/Grooveless teeth: Primarily used for high-consistency pulping, relying on friction and compression.

Bar Angle

The angle between the tooth groove and the radial direction affects the flow direction and shearing action of the slurry.

Bar and groove width

①Tooth width: The width of the grinding surface (cutting ridge).

②Groove width/depth: The dimensions of the groove that accommodate slurry and fibers.

③Groove ratio: The ratio of tooth width to groove width, a core design parameter. A large gear ratio (wide teeth, narrow groove) increases friction and compression, facilitating buffing; a small gear ratio (narrow teeth, wide groove) allows for smooth flow, strong cutting action, and typically lower energy consumption.

Bar dam

The transverse protrusions in the toothed grooves are used to break the laminar flow of the slurry, increase turbulence and mixing, and improve slurrying efficiency.

Partition design

Grinding discs are typically divided into a feeding zone, a coarse grinding zone, and a fine grinding zone from the inner ring to the outer ring. Each zone has different tooth groove ratios, rack angles, and groove depths to accommodate changes in slurry concentration and flow rate within the grinding zone, achieving optimal graded grinding. For example, the feeding zone has a wider groove width for easier feeding; the fine grinding zone has an increased tooth groove ratio for finer processing.

Parameter

Description

Specific Energy Consumption

The energy consumed to grind a unit weight of pulp. Tooth profile design has a significant impact on this.

Freeness Improvement Curve

The influence of different tooth profile designs on pulp freeness.

Fiber Morphology Influence

Tendency towards fiber length retention and fibrillation degree.

Lifespan

The expected run time for a given slurry and production intensity depends on both the material and the tooth profile.