Spin Packs & Filters

Representative spin pack bodies and precision internal components

Engineered to Support

Controlled melt cleanliness, reliable sealing, stable pressure development and consistent distribution to the spinneret or extrusion die.

TYPICAL POLYMERS: PET ● rPET ● PA6 ● PA66 ● PP ● PE ● SPECIALITY POLYMERS

Technical Selection

Pack body, filter geometry, media, layer stack and sealing interface are selected from the approved drawing and actual process data.

Spin Pack Bodies

Custom circular and rectangular configurations can be engineered to match the spinning beam, spinneret, sealing method and validated process duty.

Representative circular spin pack body components

Application Scope

01 SYNETHETCI FILAMENT: Pack interfaces for textile and industrial filament spinning

02 STAPLE FILAMENT: Housing and internal stack configurations for stable multi hole extrusion.

03 POLYMER PROCESSING: Screen pack and filtration duties requiring accurate location, sealing and support.

04 CUSTOM REPLACEMENT: Dimensional reproduction from an approved drawing or verified sample; the governing OEM limits must be retained

Spin Pack Engineering

Every replacement or custom pack should be reviewed as a pressure containing, heated precision assembly - not only as a machined component.

01 DIMENSIONAL ACCURACY: Critical diameters, threads, shoulders, plate location and spinneret seating must reproduce the approved interface.

02 PRESSURE AND TEMPERATURE CAPABILITY: Body alloy, wall section, closure and fasteners must suit the validated operating envelope.

03 SEALING INTEGRITY: Mating faces and sealing elements must limit polymer bypass and external melt leakage.

04 CONTROLLED FLOW PATH: Internal transitions should distribute melt without unnecessary stagnation, dead zones or excessive residence time.

05 SERVICEABILITY: The assembly should support repeatable opening, cleaning, inspection and rebuilding without damage to precision surfaces

Engineering Review Points

Design Authority

The approved drawing, validated material specification and process limits govern the final supplied construction.

Configuration

Mounting, melt feed, body form, closure and sealing are interdependent. A dimensional match alone does not confirm process suitability.

OEM Compatibility

Barmag, Neumag, TMT and other OEM packs may combine or reposition screens, filters and distribution plates. Supply should be based on the approved pack drawing or verified assembly; no OEM affiliation is implied.

Functional Melt Path

The Pack Creates the Controlled Pressure Path to the Spinneret

A representative pack routes metered polymer through the sealed housing, filtration and distribution stack before filament formation. Exact sequencing remains application and OEM specific.

Representative Loose Media Arrangement

Graded Bed Principle

Where a graded powder bed is used, coarse to medium to fine staging in the melt flow direction can delay local blockage and progressively build filtration resistance. Particle grades, quantities and bed depths must be selected for the actual polymer, viscosity, melt cleanliness, temperature and throughput.

Residence Time

Avoid unnecessary internal volume and stagnation after filtration. Excess residence time can aggravate thermal degradation and create new contamination downstream of the filter.

Filters for Polymer Extrusion

Custom flat, pleated and shaped metallic filters can be configured for controlled melt cleanliness, flow distribution and protection of fine downstream geometry.

Representative flat, annular and shaped metallic filter assemblies

Typical Polymer & Process Scope

Selection Basis

The filter is engineered around the contaminant profile, viscosity, throughput, temperature, available area, clean pressure drop, terminal pressure and target on stream life.

Filtration Objectives

The filter and its support stack should provide retention without creating unacceptable pressure loss, dead volume, deformation or bypass.

Flat metallic filter with prepared edge ring

Qualification Rule

Retention rating, permeability, support structure and sealing must be validated as a complete assembly. A mesh number alone is not a filter specification.

01 REMOVE CONTAMINATION: Retain hard particles, oxides, carbonised material, agglomerates and, when a suitable depth medium is used, deformable gel type contamination.

02 PROTECT DOWNSTREAM GEOMETRY: Reduce the risk of contamination reaching spinneret capillaries, film dies and other critical flow passages.

03 CONDITION MELT FLOW: Add controlled resistance that supports distribution and mixing without excessive clean pressure drop.

04 SUPPORT PACK LIFE: Provide sufficient area and dirt holding capacity to manage pressure rise rate across the operating cycle.

Filter Geometry

Geometry affects effective area, face velocity, initial pressure drop, dirt capacity and mechanical support. The approved pack dimensions remain the design boundary.

Flat Filters Compact and economical where pack depth is limited and contaminant loading is controlled.	Pleated Filters Expanded area can lower face velocity, reduce initial pressure drop or extend on stream life.	Shaped Filters Round, annular, rectangular, semicircular, oval and application specific profiles can match existing cavities.

Dimensional Control

Manufacturing Basis

Do not manufacture from a product photograph alone. Use an approved drawing or dimensionally verified reference sample.

Media Selection

Filtration medium, support structure and rating method should be considered together. Sintered metal fibre media can provide high porosity and dirt holding capacity for demanding viscous polymer duties.

Rating Must Be Stated Clearly

Identify whether the value is nominal or absolute and name the test method or acceptance basis.

Confirm media construction, wire/fibre alloy, support layers and intended flow direction.

Evaluate clean pressure drop and pressure rise rate at representative polymer viscosity and throughput.

Confirm resistance to collapse, deformation, edge bypass and cleaning damage.

Commercial Caution

Two products described by the same nominal micron value may have different pore distributions, permeability, dirt capacity and pressure behaviour.

Layer Construction

The layer stack must remain located and supported under temperature, differential pressure, handling and - where approved - cleaning cycles.

Representative annular metallic filter assembly

Common Edge and Surface Options

Stainless Steel ● Aluminium ● Copper ● Application Specific Sealing Materials

Nickel Plated Copper ● Anodised Aluminium ● Untreated Stainless Steel

Compatibility

Final alloy, coating and sealing materials must be confirmed for polymer chemistry, temperature, cleaning method and any product purity requirement.

Effect on Filament Quality

Pack filtration can reduce contamination related breaks and off denier variation, but it cannot correct polymer degradation, poor metering, temperature, quench, spinneret, draw or winding faults. Tenacity and elongation are therefore mainly indirect effects.

Selection Inputs

Reliable selection requires process, contamination, hydraulic and dimensional data. Maximising one attribute in isolation usually compromises another.

Optimisation Target

Successful design balances retention, acceptable clean pressure drop, controlled pressure rise rate and useful on stream life.

Reference Evidence

Provide the existing approved drawing, a verified sample, photographs, nameplate information and current product specification wherever available.

Plant Qualification

A controlled comparison with the existing approved pack/filter provides the most reliable basis for routine supply approval.

Recommended Approval Sequence

01 APPROVE THE DESIGN: Confirm drawing, media description, rating method, materials, dimensions and operating limits.

02 DEFINE THE TRIAL: Agree quantity, baseline, operating window, monitoring frequency and terminal differential pressure.

03 RUN COMPARABLE CONDITIONS: Use the same polymer grade and stable process settings where practical.

04 REVIEW TOTAL PERFORMANCE: Assess yarn quality, pressure trend, pack life and total operating cost before routine approval.

TEXFIL Application Support

TEXFIL coordinates application review, drawing confirmation, sample qualification, plant trial planning, commercial support and scheduled supply for polymer melt filtration projects.

Configurable Project Basis

Representative Configuration

Individual Barmag, Neumag, TMT and other OEM packs may combine or reposition screens and distribution plates. The approved OEM drawing and validated process conditions govern the project.

Evidence Basis

Manufacturing location, certificates, test methods, inspection records and acceptance criteria are confirmed in the project quotation rather than implied by this brochure.