Polymer Melt Candle Filter for Plastic Extrusion and Fiber Spinning

Technical Parameters

  

Product Type	Polymer Melt Candle Filter
Filter Media	Sintered Mesh + Sintered Fiber Felt
Material	SS304 / SS316 / SS316L
Filtration Rating	5-100μm  Customized
Structure	Candle Type / Pleated Type
Connection	Thread / Flange / Customized
Working Temperature	Up to 600℃
Application	Polymer Melt Filtration
Cleaning Method	Backwashing / Ultrasonic Cleaning

Product structure

 

The candle filter is composed of multiple stainless steel filtration layers:

1. Sintered Mesh Support Layer

The stainless steel sintered mesh provides mechanical reinforcement for the filter element. Multiple layers of woven wire mesh are laminated and sintered under high temperature and vacuum conditions, forming a strong porous metal structure.

Advantages:
►High mechanical strength
►Excellent pressure resistance
►Stable pore size
►Good corrosion resistance
►Suitable for repeated cleaning and regeneration

2. Stainless Steel Sintered Felt Filter Layer

The sintered felt layer consists of randomly arranged stainless steel fibers bonded through high-temperature sintering. Compared with traditional wire mesh, it provides deeper filtration performance and higher contaminant capacity.

Advantages:
►High porosity
►Large internal filtration area
►High dirt holding capacity
►Low pressure drop
►Excellent filtration efficiency for fine particles

3. Pleated Candle Design

The filter media is processed into a pleated structure to increase effective filtration area. Compared with conventional cylindrical cartridges, the pleated design allows higher flow capacity while maintaining compact dimensions.

The increased surface area helps reduce filtration resistance, extend operating cycles, and improve the overall efficiency of polymer melt filtration systems.
 

Related Products

Melt filter elements are designed to remove gels, black specks, unmelted particles, and other contaminants from polymer melts. Widely used in extrusion, spinning, blow molding, film blowing, sheet extrusion, and other polymer processing applications.

 

 

Working Principle of a Polymer Melt Filter Element

 

A polymer melt filter element is designed to remove contaminants, gels, unmelted particles, carbonized materials, and other impurities from molten polymers during the extrusion, spinning, film, sheet, and compounding processes. It ensures product quality, protects downstream equipment, and improves production efficiency.
 

1. Filtration Process

When the polymer melt is pumped through the filtration system under pressure:

1）Molten polymer enters the filter housing through the inlet.

2）The melt flows through the multi-layer filter media (such as stainless steel woven mesh, sintered mesh, or fiber metal felt).

3）Solid contaminants larger than the filter's pore size are captured on the filter surface or within the filter layers.

4）The purified polymer melt passes through the filter element and exits the system for further processing.

2. Contaminant Retention Mechanisms

The filter element removes impurities through several mechanisms:

1）Surface Filtration: Larger particles are trapped on the outer surface of the filter media.

2）Depth Filtration: Smaller contaminants are captured within the multiple layers of the filter structure.

3）Adsorption and Interception: Fine particles and gels are intercepted as the melt flows through complex pore channels.

3. Pressure Differential Monitoring

As contaminants accumulate: The pressure drop across the filter gradually increases.When the differential pressure reaches a preset value, the filter element should be cleaned, replaced, or switched to a standby filter.This prevents excessive pressure buildup and maintains stable production.

4. Benefits of Melt Filtration

✔ Improves product surface quality

✔ Reduces black specks and gel defects

✔ Protects extrusion dies and spinning nozzles

✔ Enhances production stability

✔ Extends equipment service life

✔ Reduces downtime and maintenance costs

Applications：Plastic Extrusion Filtration

The candle filter is widely used in plastic extrusion processes to remove contaminants from polymer melts, improving the quality of finished products.

Typical applications include: Plastic recycling extrusion, Masterbatch production, Polymer granulation, Compounding processes
 

Advantages

01

We have over 20 years of export experience, serving clients in more than 100 countries. We operate expansive production facilities with multiple specialized zones, enabling us to deliver tailored solutions that address each client’s unique production challenges. Our advanced automated production lines ensure consistent quality at high volumes, from precise raw material selection to finished housings. Built on responsibility, professionalism, and integrity, Topep has earned the trust of customers worldwide.

02

Customized filters for every application—end caps, interfaces, skeletons, filter media, and seals are all fully configurable to meet your specific needs. We are dedicated to innovation and excellence. Our stable and efficient production lines are backed by proprietary patents, CE and ISO 9001 certifications, a comprehensive production management system, and rigorous quality inspection protocols. We specialize in designing high-performance filter elements that deliver reliability, precision, and long-lasting performance.

03

Boasting a state-of-the-art production facility covering 26,000 square meters, our advanced manufacturing capabilities include CNC lathes, laser cutting machines, sintering furnaces, spot welders, pleating machines, air filter paper folding machines, automatic mesh assembly machines, spiral mesh winding machines, strapping machines, spiral cage buckle machines, ring rolling machines, filter element welding machines, and laser marking systems.

04

Our state-of-the-art production facilities, combined with a team of highly skilled engineers, ensure that every filter is designed and manufactured with exceptional precision and reliability. Through rigorous quality control protocols, we guarantee consistent performance and long-lasting durability across all our products. Topep provides customized filtration solutions that meet the highest industry standards, serving a wide range of applications worldwide.

Company Description

Henan Top Environmental Protection Equipment Co., Ltd. is a professional manufacturer specializing in filtration industry. Based in Xinxiang, Henan, China, the company operates a modern facility covering 26,000m², with strong manufacturing and in-house R&D capabilities. Our products include hydraulic oil filters, sintered metal filters, air dust collection filters, and water treatment solutions, widely used in energy and industrial applications.We serve over 7,000 customers worldwide, with exports to Europe, North America, the Middle East, Southeast Asia, and Africa. Driven by technology and committed to quality, Henan Top continuously enhances its manufacturing and service capabilities, aiming to build a globally competitive filtration brand.

FAQ
 

Q1: Can melt filter elements be cleaned and reused?

A1:Yes. Most stainless steel melt filter elements can be cleaned using:

• ♦ Thermal cleaning

• ♦ Ultrasonic cleaning

• ♦ Chemical cleaning

• ♦ Backflushing methods

Q2:How do I choose the correct filter element?

A2:Please provide:

• ► Polymer type

• ► Operating temperature

• ► Flow rate

• ► Filtration rating

• ► Working pressure

• ► Filter dimensions

Our engineers can recommend the most suitable solution.

Q3:How Long Does a Melt Filter Element Typically Last?

A3:The service life depends on:

1. Polymer cleanliness
2. Contamination levels
3. Filtration rating
4. Operating pressure
5. Cleaning frequency

Under normal conditions, stainless steel melt filter elements can be cleaned and reused multiple times, significantly reducing replacement costs and improving overall return on investment.

Workshop Show

Application field

Nonwoven Fabric Industry

Used in melt-blown, spunbond, and composite nonwoven production processes to ensure consistent fiber formation and product performance.

Chemical Fiber Industry

Applied in the production of polyester, nylon, polypropylene, and other synthetic fibers to eliminate impurities and prevent spinneret blockage.

Petrochemical Industry

Applied in polymerization and resin production processes to protect downstream equipment and maintain product purity

Masterbatch and Compound Production

Filters contaminants during color masterbatch and plastic compounding processes, enhancing product consistency and appearance.

Engineering Plastics Manufacturing

Used for filtering high-performance polymers such as PA, PEEK, PPS, PC, and ABS during processing.