Application and Selection.
Match filtration rating, effective area and mechanical support to contamination, throughput, melt viscosity and the housing. Line pressure and differential pressure must be specified separately.
- Media
- Woven mesh, sintered fibre or supported composite
- Construction
- Pleated media with an application specific support and core
- Interfaces
- Threaded, flanged and custom connections
Technical Information
Open a section to view the details, tables and illustrations.
Product Overview
Stable melt cleanliness, controlled pressure development and protection of downstream equipment.
TYPICAL POLYMERS: PET ● rPET ● PA6 ● PA66 ● PP ● SPECIALITY POLYMERS
Technical Selection
Media type, filtration rating, element geometry and connection are selected from the actual polymer, contamination, throughput and pressure profile.
Melt Cleanliness
Precision Filtration Protects Process Stability & Yarn Quality
Candle elements remove hard particles and deformable contaminants from high viscosity polymer streams before critical downstream processing.
All metal pleated element for application specific melt filtration
Customer Value
01 CAPTURE CONTAMINATION: Retain carbonised particles, metal oxides, agglomerates, undissolved polymer and gel type contamination.
02 STABILISE THE MELT: Controlled retention supports a cleaner and more uniform polymer stream.
03 PROTECT DOWNSTREAM QUALITY: Reduce visible defects, filament breaks and unplanned interruptions associated with contamination.
04 SUPPORT CRITICAL DUTIES: All metal construction is suited to fibre, film, resin and other high temperature polymer services.
Element Architecture
Engineered for Filtration Area, Strength and Controlled Reuse
Supported multi pleat media increases effective filtration area while the welded support structure maintains the flow path under pressure and cleaning cycles.
CUTAWAY: CAGE ● PLEATED MEDIA ● SUPPORT MESH ● PERFORATED CORE
Representative element architecture; the approved drawing governs the supplied construction
No. | Component | Engineering Function |
|---|---|---|
1 | Connection / Adaptor | Matches the housing interface and transfers filtered melt to the outlet. |
2 | Welded End Fitting | Seals the media assembly and maintains mechanical integrity. |
3 | Outer Guard or Support Cage | Protects the pleats during handling, operation and reverse cleaning. |
4 | Pleated Filtration Medium | Provides the required retention mechanism and effective area. |
5 | Drainage / Support Mesh | Supports the filtration medium and maintains flow channels. |
6 | Perforated Inner Core | Resists differential pressure and conveys the filtered polymer. |
7 | Closed End / Flow Guide | Reduces low flow volume where included in the approved design. |
Material Integrity
All metal construction removes the need for organic binders. Media integrity and cleanliness must still be verified for the supplied element.
Match the Retention Mechanism to the Contamination Profile
Micron rating alone is not a complete specification. Media structure, permeability, support, effective area and cleanability must suit the actual process.
Media Option | Filtration Mechanism | Best Suited Duty | Operating Value |
|---|---|---|---|
Woven Stainless Steel Mesh | Predominantly surface filtration with defined woven openings. | Hard particles, lower contaminant loading and coarser filtration. | Good permeability, narrow pore distribution and comparatively straightforward cleaning. |
Sintered Stainless Steel Fibre | Three dimensional depth filtration through a bonded porous fibre network. | Hard particles and deformable gel type contamination. | High porosity and dirt holding with resistance to temperature, differential pressure and repeated cleaning. |
Supported Composite Construction | Application specific combination of filtration, drainage and structural layers. | Processes requiring a balance of gel control, strength and permeability. | Maintains pleat stability and distributes flow through the available area. |
Media structures are selected against contamination, pressure drop and cleaning requirements
Selection Principle
Use the coarsest rating that achieves the required melt cleanliness and quality while maintaining acceptable initial pressure drop and on stream life.
Effect on Filament Quality
Filtration Improves Consistency More than It Changes the Nominal Set Point
A correctly selected candle filter helps prevent local flow restrictions and contamination related weak points. Average yarn properties remain governed mainly by polymer quality, metering, temperature, quenching, spinning speed and drawing.
Quality Parameter | Expected Filtration Effect | Important Process Limit |
|---|---|---|
Linear Density / Decitex - Denier | Supports lower filament to filament and along length variation by reducing capillary restriction and unstable contaminant passage. | Average linear density is primarily set by actual mass flow and take up speed. |
Tenacity | Reduces contaminant related weak points and supports more consistent minimum strength and tenacity CV. | Mean tenacity remains strongly dependent on polymer molecular weight, orientation and draw. |
Elongation | Supports a narrower elongation distribution through more uniform filament formation and drawing response. | The direction of the mean change is process dependent. |
Evenness / Uster CV% | Fewer transient restrictions, partial blockages and contaminant events can reduce thick thin variation. | Pump, quench and winding stability must also be controlled. |
Shrinkage And Dye Uptake | More uniform filament formation supports more consistent orientation, shrinkage and dye response. | Thermal history and drawing conditions remain decisive. |
Defects And Line Stability | Fewer gels, slubs, broken filaments, spin breaks, fuzz and downstream interruptions. | An excessively fine or overloaded element can create high pressure and shorten service life. |
Diagnostic Indication
Stable total linear density with poor single filament uniformity points toward local distribution, contamination or downstream capillary restriction rather than the metering set point.
Design Limits and Pressure Control
Confirm Every Rating Against the Approved Element Design
The media, pleat pack, support core, welds, dimensions, end fitting and cleaning history jointly determine the allowable operating envelope.
Representative protected candle element
Representative Published Value | Basis for Use |
|---|---|
300 °C Typical Working Temperature | Confirm polymer temperature, alloy, dwell time and cleaning history. |
30 MPa Typical Line / Housing Pressure | This is not the same as differential pressure across the element. |
Up To 10 MPa Maximum Differential Pressure | Final limit must be certified for the exact element construction. |
Dirt holding capacity: confirm units and test basis | Confirm the unit, test method and media grade before specifying a numerical capacity. |
Specification Basis
Representative catalogue values for the element family. They are not universal ratings; the approved TEXFIL quotation, drawing and technical data sheet govern the supplied element.
Pressure Terminology
Use Pressure Terms Consistently
Line pressure and differential pressure describe different loads. The approved element design and the measured pressure across the element must both remain within their stated limits.
ΔP = P1 – P2
Differential Pressure is Measured Across the Loaded Element
Representative pressure measurement across a candle filter element
Pressure Terms
Working Pressure
The line or housing pressure acting on the element assembly.
Differential Pressure
Upstream pressure minus downstream pressure across the loaded element; this is the critical structural and terminal operating limit.
Clean Pressure Drop
The initial resistance at stabilised throughput, melt temperature and viscosity; use it as the baseline for monitoring pressure rise.
Applications and Configurations
Adapt the Media, Geometry and Interface to the Process Duty
Standard and custom candle elements can be configured for polymer fibre, film, resin and other high viscosity services, subject to complete design review.
Application | Typical Contamination / Requirement | Selection Emphasis |
|---|---|---|
PET & rPET FIBRE | Carbonised polymer, gels, oxides and recycled feed variability. | Gel retention, low pressure rise and stable on stream life. |
PA6 / PA66 Filament | Thermal sensitivity, gels and hard particles. | Low residence volume, compatible alloy and controlled differential pressure. |
PP Fibre & Nonwovens | Additive agglomerates, char and solid contamination. | Required rating, throughput per element and cleanability. |
Film & Resin Finishing | Visible defects, gels and final product appearance. | Fine retention, uniform flow and integrity verification. |
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Representative pleated construction without an outer support cage
Connections and Mounting
Confirm the Complete Element Interface
Connection names are only a starting point. The sealing arrangement, insertion length, flow direction and removal feature must match the approved housing drawing or verified reference sample.
*Quick interface codes are representative options and must be dimensionally confirmed
Drawing Control
Connection code alone is insufficient. Confirm sealing diameter, O ring material, insertion length, flow direction, effective length, outside diameter and removal feature.
Cleaning, Inspection and Reuse
A Cleanable Element Must Be Requalified After Each Cleaning Cycle
Cleaning restores permeability only when the method is compatible with the polymer, media, alloy, welds and contamination. Excessive thermal, chemical or mechanical treatment can damage the element.
Pleated all metal construction intended for controlled cleaning and reuse
Typical Controlled Cleaning Sequence
Remove bulk polymer using an approved thermal or chemical process selected for the polymer and element construction.
Clean the media and internal flow paths using qualified reverse flow, solvent, chemical or ultrasonic steps as appropriate.
Neutralise, rinse and dry the element completely without introducing new contamination.
Inspect the connection, welds, support cage, pleats and dimensions for deformation or damage.
Verify permeability / clean pressure drop and filter integrity before returning the element to service.
Post Cleaning Verification
Requalify Integrity and Flow Resistance Before Reuse
A visually clean element is not necessarily serviceable. Compare each cleaned element with approved dimensional, permeability and integrity acceptance criteria.
Post Cleaning Check | Purpose |
|---|---|
Visual And Dimensional Inspection | Detect damaged pleats, cage deformation, weld defects or interface wear. |
Permeability / Flow Resistance Test | Confirm that polymer and cleaning residue have been adequately removed. |
Bubble Point Or Qualified Bypass Flow Test | Detect large pores, leaks or breaches that could compromise retention. |
Cycle History Record | Track cleaning count, pressure recovery and any change in integrity values. |
Important
Do not release an element for reuse solely because it appears visually clean; integrity and flow resistance must remain within the approved acceptance limits.
Selection Inputs
Define the Complete Application Before Selecting the Candle
Reliable selection requires process, contamination, hydraulic and dimensional data. A nominal micron rating cannot compensate for an unsuitable area, support structure or interface.
Information Category | Data Required for Technical Review |
|---|---|
Polymer | Grade, virgin/recycled content, additives, intrinsic viscosity or melt viscosity range and thermal sensitivity. |
Process Conditions | Normal / maximum temperature, total throughput, number of elements, viscosity and operating cycle. |
Contamination | Hard particles, gels, char, oxides, agglomerates, target defect or current quality issue. |
Filtration Requirement | Current and required retention rating, media type, effective area and required product quality. |
Pressure Profile | Clean inlet/outlet pressure, initial differential pressure, terminal limit and pressure rise rate. |
Housing and Flow | Housing drawing, flow direction, element quantity, spacing, support and any dead volume constraints. |
Element Dimensions | Overall length, effective length, OD, ID/core, end fitting, sealing diameters and tolerances. |
Cleaning and Life | Existing cleaning method, cycle count, failure mode, on stream life and post cleaning test method. |
Reference Evidence | Existing element drawing, sample, photographs, nameplate data and current supplier specification. |
Minimum Dimensional Control
Do not manufacture from a product photograph alone. Use an approved drawing or dimensionally verified reference sample.
Application Specific Rating
Final filtration rating and media choice must balance retained contamination, clean pressure drop, pressure rise rate and target on stream life.
Plant Qualification
Prove Performance Against Agreed Process & Quality Criteria
A controlled comparison with the existing approved element provides the most reliable basis for routine supply approval.
Trial Measurement | What to Record | Decision Value |
|---|---|---|
Initial Pressure Drop | Stable throughput, melt temperature and viscosity after start up. | Confirms permeability and hydraulic fit. |
Pressure Rise Rate | Differential pressure trend over the agreed operating period. | Indicates contaminant loading and usable on stream life. |
Process Stability | Throughput, temperature, pressure fluctuations and interruptions. | Checks that the element supports normal operation. |
Filament / Product Quality | Linear density CV, tenacity and elongation CV, breaks, defects, colour or film appearance as applicable. | Links filtration performance to saleable quality. |
Element Condition | Pleat shape, cage, welds, seals and retained contamination after removal. | Confirms mechanical suitability and failure mode. |
Cleaning Recovery | Post cleaning permeability, integrity result and pressure drop recovery. | Determines whether repeated use remains economical and safe. |
Recommended Approval Sequence
Approve the element drawing, media description, rating method, dimensions and design limits.
Agree the trial quantity, operating window, monitoring frequency and terminal differential pressure.
Run the trial beside a defined baseline under comparable polymer and process conditions.
Review quality, pressure trend, on stream life, cleanability and total operating cost before routine approval.
Qualification Principle
Approve the complete element and process result - not only the nominal micron rating or initial purchase price.
TEXFIL Application Support
Application Led Support from Enquiry to Controlled Supply
TEXFIL Technologies coordinates application review, drawing confirmation, sample qualification, commercial support and planned supply for polymer melt filtration projects.
Configurable Element Supply
Control Point | Project Basis |
|---|---|
Media and Rating | Woven mesh, sintered metal fibre or supported composite; the grade and rating method are confirmed for the application. |
Construction | Outer cage or cage free arrangements, support layers, inner core and flow guide to the approved design. |
Materials and Seals | Metallic alloy and sealing materials selected for polymer temperature, chemistry and cleaning method. |
Dimensions and Interface | OD, ID (core), effective and overall length, connection and sealing diameters controlled by drawing or verified sample. |
Verification | Visual and dimensional inspection, with permeability or integrity testing included where specified. |
Documentation | Quotation, approved drawing, product specification and agreed inspection or test records. |
TEXFIL Support
Application review, sample and plant trial planning, documentation, commercial coordination and planned supply support from India.
Evidence Basis
Manufacturing location, applicable certificates, test methods, inspection records and acceptance criteria are confirmed in the project quotation rather than implied by this brochure.
Prepare Your Enquiry
What to Send Us.
Polymer; temperature and throughput; filter housing drawing; element dimensions; connection; clean and terminal differential pressure; current cleaning method.
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