Aite LFZK Series: Master heat, defeat stickiness, extend cartridge life – standardize every step.

1. Working Condition Pain Points & Product Core Positioning

Welding fume is a complex cocktail of hazards: molten metal oxide particles, atomized oil mist, tar colloids, and high-temperature

 spark fragments generated by arc melting. Under prolonged operation, ordinary polyester filter cartridges face two fatal failure

 modes:

· Thermal softening & deformation – media fibers lose structural integrity under sustained heat.

· Sticky dust agglomeration – tar and fine metal dust form an impermeable, concrete-like layer on the media surface.

Conventional non-coated filter cloth typically becomes blinded within 300–500 operating hours, leading to sharp airflow 

attenuation, excessive fan energy consumption, frequent stack emission exceedances, and dramatically shortened cartridge 

service life.

Our new-generation High-Temperature Anti-Stick Welding Filter Cartridges address these challenges through two core technical 

routes:

· Aramid / modified high-temperature polyester base fabric compounded with a PTFE microporous anti-stick membrane.

· Integrated high-temperature resistant sealing system and reinforced anti-spark structural design.

These innovations solve the dual risks of thermal media damage and sticky dust blockage across manual welding, robotic

 automation, plasma cutting, and alloy welding production lines – extending the service cycle of all matched filter cartridges 

by over 40%.

This updated guide systematically presents full-process standardized usage points, covering:

· Pre-installation matching

· Real-time operational parameter control

· Pulse-jet cleaning specifications

· Daily inspection protocols

· Regular maintenance limits

· Fault diagnosis and troubleshooting

A comprehensive FAQ section is appended for workshop maintenance engineers and equipment managers.

2. Pre-Installation Matching Key Points (Eliminate Hidden Dangers from the Source)

2.1 Filter Cartridge Material Grade Matching Based on Flue Gas Temperature

Two critical temperature indicators must be distinguished: continuous long-term operating temperature and instantaneous 

peak spark temperature. Incorrect material selection accelerates thermal aging and dust adhesion.

Welding Type Continuous Temp Peak Spark Temp Recommended Media

Conventional carbon steel manual welding ≤110℃ ≤130℃ Anti-static PTFE-laminated modified polyester – continuous

 resistance 130℃, peak 150℃. Nano-PTFE surface film prevents molten oxide penetration; tar colloid cannot adhere to smooth

 film.

High-load robotic / stainless steel alloy welding 110–150℃ Frequent high-temp spark impact Mandatory Aramid (Nomex) 

base + PTFE composite – continuous 200℃, peak 220℃. No softening, shrinkage, or decomposition under long-term high-temp

 flue gas.

Plasma cutting / thick-plate high-current welding Instantaneous sparks >200℃ Heavy molten metal splash Add independent 

metal flame-retardant baffle at inlet; match full PTFE fiberglass high-temp cartridge with thickened double-layer pleats to

 reduce local heat concentration.

2.2 Structural & Sealing Matching Standards for High-Temperature Anti-Stick Conditions

· End-cap bonding: High-temperature oil-resistant epoxy full-circumference hot-melt composite,

 peel strength ≥50 N/cm – prevents ordinary polyurethane adhesive failure above 120℃.

· Sealing ring: Replace standard NBR with silicone or FKM fluororubber – continuous resistance -40℃~180℃, no hardening 

or leakage under thermal cycling.

· Internal support skeleton: Galvanized perforated steel mesh, wall thickness ≥1.2 mm, thermal expansion coefficient 

matched to media.

· Anti-static grounding: All metal end-caps and housing must be grounded to ≤1 Ω. Welding dust is conductive – static 

accumulation firmly adsorbs fine dust to the membrane surface.

2.3 Pre-Equipment Airflow & Face Velocity Pre-Calculation

Excessive face velocity is the primary cause of sticky dust compaction. For welding cartridges, face velocity must be controlled

 below 0.6 m/min:

· Single-station light-load manual welding: 0.5–0.6 m/min (10% air volume margin)

· Multi-station continuous robotic welding: 0.4–0.5 m/min (20% margin)

· Plasma cutting / high-dust high-heat: ≤0.4 m/min (30% margin)

If velocity exceeds limits, hot flue gas presses molten tar and metal dust tightly onto the PTFE membrane, forming a hard sticky 

layer that pulse cleaning cannot remove.

3. Real-Time Operation Control Key Points (Stable High-Temperature Anti-Stick Performance)

3.1 Temperature Control Specifications

· Avoid heat accumulation: In summer (>38℃ ambient), open maintenance doors during non-welding shifts to keep box

 temperature below 140℃ (polyester) or 190℃ (aramid). Prolonged heat causes tar components to solidify into sticky film.

· Prevent cold-hot condensation: In winter, preheat the box for 15 minutes before production to avoid cold media contacting

 hot fume and creating moisture condensation – which forms mud-like sticky dirt. If condensation occurs, temporarily increase

 pulse frequency by 50%.

· Limit continuous high-load duration: For fully automated lines, schedule 15-minute intermittent cooling every 4 hours of 

full-load operation.

3.2 Real-Time Differential Pressure (ΔP) Threshold Management

ΔP is the core indicator of sticky dust adhesion. Establish three-stage early-warning standards:

Zone ΔP Range Status & Action

Normal stable operation 120–180 Pa (initial); maintained <300 Pa PTFE membrane remains smooth; pulse cleaning fully removes

 dry dust.

Sticky dust early warning 350 Pa Partial tar layer forming; shorten pulse cycle and increase pressure within limits.

Mandatory replacement 600 Pa Hard sticky agglomeration formed; pulse cannot restore airflow; replace immediately.

For multi-station continuous welding, record ΔP per shift. If ΔP rises >80 Pa within one shift, sticky adhesion is 

accelerating – adjust parameters immediately.

4. Pulse-Jet Cleaning Standard Operation (Core to Maintain Anti-Stick Performance)

The PTFE anti-stick membrane relies on standardized pulse back-blowing to maintain a smooth surface. Improper settings 

scratch the membrane or fail to remove sticky dust.

4.1 Compressed Air Quality & Pressure Standards

· Air source purification: Must include a cold dryer and oil-water separator – oil content ≤0.1 ppm, dew point ≤-20℃.

 Oil-contaminated air causes irreversible sticky blockage.

· Pressure grading:

  · Light-load single-station: 0.40–0.45 MPa

  · Conventional multi-station: 0.45–0.55 MPa

  · High-temp high-tar alloy: Maximum 0.6 MPa – higher tears the membrane; lower fails to peel sticky dust.

4.2 Pulse Cycle & Duration Settings

Core logic: frequent light blowing prevents dust compaction.

Condition Pulse Cycle Single Duration

Low-temp light-load carbon steel 10–15 min 0.15–0.2 s

Medium-temp continuous robotic 5–8 min 0.2–0.25 s

High-temp stainless/alloy (high tar) 3–5 min 0.25–0.3 s

Prohibit long-interval concentrated high-pressure blowing – this compacts dust into hard sticky blocks. Blow direction must

 be from inner support outward (reverse blowing).

5. Daily Inspection & Regular Maintenance Judgment Standards

5.1 Daily Shift Inspection (10 minutes)

· ΔP recorder check – compare with previous shift

· Box temperature reading – confirm within media limit

· Inlet flame-retardant baffle & pre-filter cotton – clean metal sediment, replace oil-saturated cotton

· Pulse air source oil-water separator – drain accumulated water/oil

5.2 Weekly Comprehensive Inspection

· Seal leakage check – smoke overflow at end-cap gaps indicates aging seals; replace with FKM/silicone.

· Spot-check cartridge surface – if black hard sticky patches appear, adjust pulse cycle and face velocity immediately.

· Grounding resistance test – confirm ≤1 Ω to eliminate static-assisted fine dust adhesion.

6. Common Fault Troubleshooting (Improper Use Related)

Fault Symptom Root Cause Solution

Rapid ΔP rise; hard black sticky layer Excessive face velocity; oil/water in pulse air; pulse cycle too long Increase cartridge count; 

replace dryer/separator; shorten cycle to 3–5 min; adjust pressure to 0.5–0.55 MPa

Local cartridge shrinkage; severe adhesion at pleat tops Box temperature exceeds media limit; missing flame-retardant baffle 

Replace with aramid high-temp cartridges; reinstall baffle; increase intermittent cooling

Pulse blowing no ΔP recovery PTFE membrane scratched/worn; tar permanently solidified on surface Discard damaged cartridges;

 strengthen pre-filter oil mist adsorption

Static spark risk; fine dust firmly adsorbed Grounding failure; non-anti-static media mismatched Reconnect ground wire; 

replace with conductive anti-static PTFE high-temp cartridges

7. Conclusion

The stable service life of high-temperature anti-stick filter cartridges in welding workshops depends on full-process standardized 

control – from pre-installation material matching, real-time temperature and face velocity management, pulse-jet parameter

 optimization, to daily inspections.

The PTFE microporous membrane – the core anti-stick enabler – is vulnerable to:

· High-velocity airflow impact

· Oil contamination

· Mechanical friction

· Prolonged over-temperature heat accumulation

Any non-standard operation in any link will rapidly degrade anti-stick performance, increasing maintenance costs and risking

 emission non-compliance.

By strictly matching aramid or modified polyester media to flue gas temperature, controlling face velocity below 0.6 m/min, 

supplying oil-free dry pulse air with optimized cleaning cycles, and integrating front-end flame-retardant and oil-mist

 pre-treatment, you can:

· Maximize cartridge anti-stick and high-temperature resistance

· Extend replacement cycles by >40%

· Reduce total operating and maintenance costs of the welding dust extraction system

8. Comprehensive FAQ

Q1: Why can't ordinary polyester filter cartridges resist sticky welding dust even when face velocity is reduced?

A1: Ordinary polyester lacks a smooth PTFE anti-stick film. Under high-temperature flue gas impact, tar and molten metal 

dust embed into the fiber pores, forming a permanent hard sticky layer that pulse blowing cannot dislodge. The PTFE

 membrane provides a non-stick surface that prevents penetration and allows dust to be easily pulsed off.

Q2: What material cartridge should be selected for long-term 120–150℃ stainless steel welding fume?

A2: Aramid (Nomex) base fabric compounded with a PTFE anti-stick membrane. It offers continuous temperature resistance

up to 200℃, will not soften or deform under medium-high temperature flue gas, and effectively slows dust adhesion speed. 

Standard polyester would degrade rapidly in this range.

Q3: Can blocked high-temperature anti-stick welding cartridges be washed and reused?

A3: Strictly prohibited. Water washing causes tar dust to solidify and bond tightly to the membrane surface. Cleaning agents 

corrode the microporous PTFE film, permanently destroying its anti-stick function. Only 1–2 emergency low-pressure 

reverse-blowing treatments are allowed – and even these are not recommended as a routine practice.

Q4: What is the recommended pulse pressure for aramid PTFE cartridges in robotic welding applications?

A4: For robotic multi-station continuous welding, maintain pulse pressure at 0.45–0.55 MPa. Do not exceed 0.6 MPa, as higher 

pressure can tear the delicate PTFE membrane. Lower pressure will fail to remove slightly sticky metal oxide dust from the 

membrane surface.

Q5: How often should the pre-filter oil-mist cotton be replaced?

A5: Inspection is recommended weekly. Replace when visible oil staining covers >50% of the cotton surface, or when the

 differential pressure across the pre-filter increases by more than 150 Pa. Oil breakthrough will quickly destroy the anti-stick

 property of the main cartridges.

Q6: What is the correct grounding resistance requirement, and why is it critical?

A6: Grounding resistance must be ≤1 Ω. Welding dust consists of conductive metal oxides. Without proper grounding, 

static charge accumulates on the cartridge surface, attracting fine dust particles and bonding them tightly to the PTFE

 membrane – dramatically increasing cleaning difficulty and accelerating blockage.

Q7: How can I tell if the PTFE membrane has been damaged?

A7: Signs include: (a) pulse cleaning no longer reduces ΔP below 400 Pa; (b) visible tears or scratches on the cartridge surface 

during visual inspection; (c) localized dust penetration (smoke) through the media. Once damaged, the cartridge cannot be 

repaired – replacement is mandatory.

Q8: What is the typical service life of high-temp anti-stick welding cartridges under proper operation?

A8: With correct matching, face velocity ≤0.6 m/min, oil-free dry air, and optimized pulse settings, expect 18–24 months for 

polyester-based and 24–36 months for aramid-based cartridges. Improper operation can reduce this to 3–6 months.

Q9: Is it better to use time-based or differential-pressure-based pulse cleaning?

A9: Differential-pressure-based is strongly preferred. It triggers cleaning only when needed (e.g., at 350 Pa), adapting to 

real-time dust load variations. Time-based cleaning wastes compressed air during low-load periods and may allow dust

 compaction during high-load periods. Our updated PLC controllers support both – we recommend ΔP-triggered with a

 time-based safety override.

Q10: Can the LFHY-2000 mobile unit use these high-temp anti-stick cartridges?

A10: Yes. The LFHY-2000 and similar mobile collectors can be retrofitted with our high-temperature anti-stick cartridges.

 However, 

ensure the fan and pulse system can deliver the required pressure and that the housing temperature limit is not exceeded. 

For plasma or heavy robotic welding, we recommend stationary collectors with larger cartridge capacity.

Q11: What should I do if differential pressure rises more than 80 Pa within a single shift?

A11: This indicates accelerated sticky dust adhesion. Immediate actions: (a) shorten pulse cycle to the minimum recommended

 range (e.g., 3–5 min); (b) verify compressed air is oil/water-free; (c) check face velocity – if >0.6 m/min, reduce production load

 or add filter capacity; (d) inspect for missing flame-retardant baffles or seal leaks.

Q12: Are these cartridges compatible with explosive dust environments (ATEX)?

A12: Yes, we offer an ATEX-certified variant with anti-static conductive fibers, grounded metal components, 

and spark-resistant construction. Please specify your hazardous zone classification and dust type when ordering so

 the correct certification and bonding details are applied.

Q13: What is the warranty coverage for high-temperature anti-stick cartridges?

A13: We provide a 12-month warranty against manufacturing defects in materials and workmanship.

 The warranty does not cover failures caused by: (a) operation above specified temperature limits; (b) oil/water contamination 

in pulse air; (c) mechanical damage during installation; (d) chemical attack from incompatible cleaning agents; (e) exceeding 

face velocity limits.

Q14: Can I mix different cartridge materials in the same dust collector?

A14: Not recommended. Different materials have different temperature limits and pressure-drop characteristics, leading 

to uneven airflow distribution. This can cause some cartridges to overload and blind prematurely while others remain 

underutilized. Always use identical media across all cartridges in a single collector.

Q15: How should I store spare high-temperature anti-stick cartridges?

A15: Store in a cool, dry, dust-free environment, away from direct sunlight and ozone sources (e.g., motors, welding arcs). 

Ideal temperature: 5–35℃, humidity <65%. Keep cartridges in their original sealed packaging until installation. Do not stack 

heavy objects on top. Shelf life is 36 months from the manufacturing date under proper storage.