Heavy Weight PP Needle Felt for Mineral Filtration

Engineered for High-Solids Slurry, Abrasive Minerals, and Continuous Dewatering

Heavy Weight PP Needle Felt is specifically engineered for mineral filtration and high-solids slurry dewatering.
By combining increased basis weight with controlled needle-punching and finishing processes, it delivers stronger structural integrity, smoother surface condition, and more uniform permeability, supporting stable filtration performance in demanding mineral processing environments.

Why Mineral Filtration Requires Heavy Weight PP Needle Felt

Mineral filtration applications typically operate under harsh mechanical and hydraulic conditions, including:

• High solids concentration and abrasive mineral particles
• Severe mechanical stress during filtration and discharge cycles
• Continuous operation with extended service intervals
• Requirement for stable pressure drop and predictable filtration behavior

Limitations of Standard-Weight Filter Media

Under these conditions, standard-weight PP needle felt often suffers from:

• Accelerated surface wear
• Structural deformation under load
• Unstable pressure drop and inconsistent cake formation

Why Heavy Weight PP Needle Felt Is Required for Mineral Filtration

Heavy weight PP needle felt addresses these issues through a denser fiber structure and reinforced internal skeleton, making it more suitable for long-term, high-load mineral filtration.

Product Specification Range

Material & Structure

• Material: Polypropylene (PP)
• Structure: Needle-punched felt

Basis Weight Range

• 650–950 g/m²

Typical Applications

• Mineral slurry filtration
• High-solids slurry dewatering
• Tailings filtration and volume reduction
• Concentrate filtration

Thickness, air permeability, and structural parameters can be optimized based on specific filter press design and operating conditions.

Polypropylene Double-Sided Smooth Needle Felt

Technical Specifications

Parameter	Unit	650 g/m²	800 g/m²	950 g/m²	Tolerance / Notes
Material	—	Polypropylene staple fiber	Polypropylene staple fiber	Polypropylene staple fiber	—
Basis Weight	g/m²	650	800	950	±5%
Air Permeability	L/m²·s	15	10	5	±20%
Thickness	mm	2.0	2.2	2.35	±0.2
Tensile Strength (Warp)	N	≥1300	≥1300	≥1300	—
Tensile Strength (Weft)	N	≥1500	≥1500	≥1500	—
Elongation at Break (Warp)	%	≤25	≤25	≤25	—
Elongation at Break (Weft)	%	≤65	≤65	≤65	—
Continuous Operating Temperature	°C	≤90	≤90	≤90	—

Technical Notes

• All mechanical properties below thickness are identical across different basis weights.

• Values listed are typical production data for reference.

• Specifications may be adjusted according to application requirements and filtration conditions.

Engineering Advantages of Heavy Weight PP Needle Felt

Within the same basis-weight range, filtration performance is determined not only by weight, but also by manufacturing control and structural design.
Our heavy weight PP needle felt is engineered to achieve a balanced combination of surface condition, internal strength, and permeability uniformity.

Smoother Surface for Stable Filtration and Cake Release

Optimized needling density and finishing processes create a more uniform surface, resulting in:

• Reduced pressure drop fluctuation during initial filtration
• More consistent filter cake formation
• Improved cake release during discharge
• Reduced random particle adhesion

In mineral filtration, surface stability directly affects efficiency and operational consistency.

Stronger Structure for High-Solids and Abrasive Slurries

The reinforced internal fiber skeleton provides:

• Tighter fiber bonding and improved cohesion
• Higher resistance to deformation under load
• Better structural retention in high-solids slurry conditions
• Extended service life during continuous operation

This structure is particularly well suited for tailings dewatering and concentrate filtration, where mechanical stress is significant.

Uniform Air Permeability for Stable Operation

Higher basis weight does not automatically lead to unstable airflow.
Through balanced structural design, our heavy weight PP needle felt achieves:

• More uniform air permeability distribution
• Reduced localized high- or low-resistance zones
• Smoother pressure-drop curves over time
• Improved long-term operational stability

For mineral filtration systems, permeability consistency is often more critical than peak flow values.

Typical Mineral Filtration Applications

• Mineral slurry filtration and dewatering
• Concentrate filtration (copper, iron, lead-zinc, etc.)
• Tailings dewatering and tailings volume reduction
• Coal washing and coal slurry dewatering
• Industrial minerals (quartz, feldspar, talc) solid-liquid separation

Basis Weight Selection Guide (650–950 g/m²)

General guideline: higher solids content, stronger abrasion, and longer continuous operation favor higher basis weight.

Recommended Ranges

• 650–750 g/m² – Balanced throughput and service life
• 750–850 g/m² – Enhanced structural stability for higher-load slurries
• 850–950 g/m² – Heavy-load conditions with severe abrasion and continuous operation

Final selection can be refined based on:

• Slurry characteristics
• Particle size distribution
• Filter press type
• Target cake moisture

Compatible Filter Press Brands

Our heavy weight PP needle felt filter cloths (650–950 g/m²) are compatible with a wide range of filter press systems used in mineral processing and tailings applications, including:

• Metso Outotec (Lasta Series)
• Diemme Filtration
• Andritz Separation
• FLSmidth
• MC Press (Siemens systems)
• Ishigaki

Compatibility refers to dimensional, structural, and operational suitability only and does not imply any brand affiliation or authorization.

Why Choose Us for Mineral Filtration Applications

• Engineering-oriented material selection for mineral filtration
• Stable manufacturing capability with consistent batch quality
• Designed for project-based supply and long-term industrial operation
• Sample support and application guidance available

Contact Us

If you are sourcing heavy weight PP needle felt (650–950 g/m²) for mineral filtration, please share your operating conditions.
We will recommend an appropriate basis weight and structural configuration to help achieve stable filtration performance and extended service life.