Custom Filter Element with Mesh

Custom Filter Element Manufacturing / Mesh Insert Molding Services

Processing Capabilities for Inline Mesh Filter Cartridge

Item	Detailed Capabilities
Material (Housing)	Nylon (PA6/PA66), PP, PVC, CPVC, PVDF, ABS, PC (Polycarbonate), or custom engineering plastics
Material (Filter Element)	Nylon mesh, black wire cloth, PP mesh, PET mesh, stainless steel wire cloth
Housing Style	Inline / Cylindrical / Cartridge-style / Straight-through
Transparent Housing	PC, PMMA (Acrylic), or clear Nylon for visual flow monitoring and filter condition inspection
Disc Diameter	5–500 mm (custom sizes available)
Cartridge Outer Diameter	20–150 mm (custom sizes available)
Cartridge Length	50–500 mm (custom lengths available)
Shapes	Cylindrical, pleated, multi-layered, conical, or fully custom designs
Mesh Count	10–500 meshes (plain weave, twill weave, or dutch weave)
Filtration Accuracy	50–1000 μm (nominal or absolute rating)
Structure	Single layer, multiple layers, or composite structures with inner core and outer mesh sleeve
Frame Style	Over molding (encapsulation), insert molding, ultrasonic welding, heat staking, or snap-fit assembly
Connection Types	Threaded (BSP, NPT, Metric), hose barb, push-fit, socket weld, flange, or custom connections
Port Size	1/4" to 2" (DN8–DN50), custom sizes available
Pressure Rating	0.6–1.6 MPa (6–16 bar), depending on material and design
Temperature Range	-20°C to 120°C (depending on housing material)
Sealing Method	O-ring, gasket, integrated over-molded seal, or black retaining ring compression seal
Assembly	Complete inline filter cartridge assembly including transparent housing, mesh sleeve, end caps, retaining ring, and seals
Surface Finish	Smooth, textured, or custom finishes available
Color	Black, white, grey, blue, clear, or custom colors matched to customer requirements
Processing Tolerance	Diameter tolerance ±0.1mm, Length tolerance ±0.5mm
Certifications	ISO9001, ROHS, CE, food-grade options available
Applications	Water treatment, RO pre-filtration, irrigation, chemical processing, HVAC, marine, aquarium, and industrial fluid filtration

Processing Techniques & Difficulties for Semi-Transparent SCR Filter Cartridge

1. Thin-Walled, Long Tubular Shape

Key Point:
The thin-walled, long tubular shape makes it prone to short shots or warping. So we need high-speed, high-pressure injection combined with precise mold temperature control, plus a hot runner system to make sure the melt fills the cavity evenly.

Processing Techniques:

• Hot runner system with valve gates for precise filling control and reduced material waste.
• High-speed injection (200–500 mm/s) to fill thin walls before the melt freezes.
• High injection pressure (120–180 MPa) to overcome high flow resistance in long, thin sections.
• Multi-stage injection profile to balance flow front velocity and avoid jetting.
• Precise mold temperature control (80–120°C depending on material) using oil or pressurized water heaters.
• CAE flow simulation (Moldflow) to optimize gate location, runner size, and filling balance.
• Conformal cooling channels for uniform temperature distribution along the tubular length.

Difficulties:

• Short shots at the far end of the tube due to premature melt freezing.
• Warpage along the length due to uneven cooling and packing.
• Weld lines where flow fronts meet, reducing transparency and strength.
• High scrap rate during startup due to unstable filling.

Countermeasures:

• Use high melt temperature (240–280°C for PA/PC, 220–250°C for PP) to improve flowability.
• Increase injection speed and packing pressure (85–95% of injection pressure) with a long hold time.
• Optimize gate location to balance flow length and avoid weld lines in critical areas.
• Use hot runner with sequential valve gating to control fill sequence and weld line location.
• Implement scientific molding (decoupled molding) to determine optimal switchover point.
• Use mold temperature controllers with PID feedback to maintain ±1°C uniformity.
• Anneal parts after molding (80–100°C, 2–4 hours) to relieve internal stress and reduce warpage.

2. Metal Mesh Over-Molding

Key Point:
Metal mesh over-molding. Positioning is tricky: the mold must be designed to place the mesh during injection.

Processing Techniques:

• Insert molding with a precision mesh positioning jig to hold the mesh in place during injection.
• Magnetic or vacuum fixturing to secure the mesh without damaging it.
• Over-molding with molten polymer encapsulating the mesh edges for a leak-proof bond.
• Mesh pre-forming (cutting, rolling, or pleating) to match the cavity geometry.
• Plasma treatment on the mesh surface to improve polymer adhesion.
• Pre-heating the mesh (80–120°C) to improve bonding and reduce thermal shock.

Difficulties:

• Mesh displacement during injection due to high melt pressure.
• Incomplete encapsulation causing bypass leakage.
• Mesh damage (tearing, deformation) during mold closing or injection.
• Weak bond between mesh and polymer leading to delamination.
• Mesh edges creating flow obstruction and weld lines.

Countermeasures:

• Use mesh positioning jigs with tight tolerances (±0.05mm) to hold the mesh securely.
• Design mechanical anchors (grooves, ribs, or perforations) on the mesh edge for polymer interlocking.
• Reduce injection speed locally around the mesh to prevent displacement.
• Use low-viscosity polymer grades to improve penetration into mesh openings.
• Pre-dry the mesh to remove moisture and prevent steam pockets.
• Inspect mesh position in-process using vision systems or sensors.
• Perform pressure testing on 100% of parts to detect bypass leakage.

3. Injection Gate Location & Ejection

Key Point:
Injection gate location. Ejection is a headache – it's easy to end up with drag marks or stress whitening. We recommend a gentle ejection system, like stripper sleeves or air-assisted ejection, along with proper draft angles and a mirror-polished cavity surface.

Processing Techniques:

• Gate location optimization using CAE simulation to balance flow and minimize weld lines.
• Hot runner valve gates for precise fill control and reduced gate vestige.
• Stripper sleeves for uniform ejection force around the cylindrical part.
• Air-assisted ejection for gentle release of thin-walled sections.
• Mirror-polished cavity (SPI A1–A2) to reduce friction during ejection.
• Proper draft angles (1.5–3°) on all vertical surfaces.
• Ejection simulation to predict stress points and optimize ejection pin layout.

Difficulties:

• Drag marks on the transparent surface during ejection.
• Stress whitening (crazing) from excessive ejection force.
• Part deformation or cracking during ejection.
• Gate vestige affecting appearance and flow characteristics.
• Ejection marks on sealing surfaces causing leakage.

Countermeasures:

• Use stripper sleeves instead of ejector pins for uniform force distribution.
• Apply air-assisted ejection for thin-walled or delicate sections.
• Polish cavity surfaces to SPI A1–A2 finish to minimize friction.
• Maintain draft angles of 1.5–3° on all vertical walls.
• Use mold release agent sparingly (or not at all for transparent parts).
• Optimize ejection speed and force using servo-controlled ejection.
• Anneal parts after molding to relieve stress and prevent stress whitening.
• Inspect for drag marks and stress whitening under polarized light.

4. Transparency & Surface Quality

Key Point:
Semi-transparent parts require high surface quality and consistent optical properties. Any flow marks, weld lines, or contamination will affect appearance and function.

Processing Techniques:

• Use high-purity, optical-grade resins with a consistent melt flow index.
• Mirror-polish mold surfaces to SPI A1–A2.
• High mold temperature to improve surface replication and reduce flow marks.
• Slow injection speed near the gate to avoid jetting and flow marks.
• Vacuum venting to prevent gas entrapment and surface defects.
• Clean room assembly to prevent contamination.

Difficulties:

• Flow marks and weld lines reducing transparency.
• Sink marks on thick sections.
• Contamination (dust, oil) causing surface defects.
• Color variation between batches.

Countermeasures:

• Optimize injection speed profile to maintain uniform flow front.
• Use sequential valve gating to control weld line location.
• Maintain consistent mold temperature (±1°C) across all cavities.
• Use vacuum venting or porous vent inserts to eliminate gas traps.
• Handle materials in closed-loop conveying systems to prevent contamination.
• Use color masterbatch with tight tolerance and consistent dispersion.
• Perform visual inspection under controlled lighting for surface defects.

5. Dimensional Accuracy & Fit

Key Point:
The part must fit precisely into the SCR system housing, with tight tolerances on the outer diameter, length, and connection features.

Processing Techniques:

• CNC-machined mold inserts for tight tolerances (±0.05mm).
• In-process gauging for critical dimensions.
• Statistical process control (SPC) for dimensional trends.
• Annealing to stabilize dimensions after molding.

Difficulties:

• Shrinkage variation causing dimensional deviation.
• Warpage affecting fit and sealing.
• Batch-to-batch variation in material shrinkage.

Countermeasures:

• Use CAE shrinkage simulation to compensate mold dimensions.
• Maintain consistent mold temperature and packing pressure.
• Anneal parts (80–100°C, 2–4 hours) to stabilize dimensions.
• Implement SPC with control charts for critical dimensions.
• Inspect 100% of parts for fit-critical dimensions using automated vision systems.

Our Workflow

A transparent, step-by-step process from design to delivery — tailored for inline mesh filter cartridges.

Stage 1 — Inquiry & Drawing Review

You send us your drawing or sample. We review dimensions, material requirements, wall thickness, mesh specifications, and SCR system compatibility within 24 hours.

Stage 2 — DFM Report

Our engineers provide a Design-for-Manufacturability report, highlighting potential issues such as short shots, warpage, mesh displacement, and ejection marks, and suggesting optimizations for moldability, transparency, and cost.

Stage 3 — Mold Design & Fabrication

We design the mold in SolidWorks, simulate filling and cooling with Moldflow, and machine the mold in-house with hot runner systems, mesh positioning jigs, and conformal cooling channels (lead time: 25–35 days).

Stage 4 — Sampling & Approval

We produce T1 samples with over-molded metal mesh, send them with inspection reports (dimensional, mesh pull-test, leak-test, transparency inspection), and iterate until you approve.

Stage 5 — Mass Production & Shipping

Once approved, we begin mass production with full SPC monitoring, 100% pressure testing, and cold cycling verification. Typical lead time: 15–20 days after approval.

Why Choose Yixing Technology?

Partner with a trusted leader in precision mesh insert molding for filter elements.

20+ Years Experience
Specialized in over-molding and insert molding since 2003. We have completed 5,000+ custom filter disc and cartridge projects.
Extensive experience in over-molding metal mesh, black wire cloth, and engineering plastics for automotive SCR systems.

ISO 9001:2015 Certified
Full quality management system with traceable production records for every batch.
We inspect each SCR filter cartridge batch for dimensional accuracy, mesh bonding strength, leak-proof performance, transparency, and low-temperature impact resistance.

One-Stop Service
From mesh sourcing → mold design → injection molding → assembly → packaging, all under one roof in our Shanghai factory.
From semi-transparent housing molding and metal mesh over-molding to annealing, pressure testing, and global shipping — all under one roof.