Premium Scraper Blades & Filter Plates for Continuous Melt Filters

Upgrade to H13 when your melt processing temperature consistently exceeds 260 °C, or when you are processing highly contaminated streams such as post-consumer agricultural film, WEEE plastics, or heavily printed packaging waste. These feedstocks generate significant thermal cycling stress that causes D2 to soften and lose edge geometry within 200–400 operating hours. H13's molybdenum-vanadium carbide matrix maintains hardness and dimensional stability up to 300 °C, extending scraper service life by 60–80% on these feedstocks.

A worn scraper blade leaves a residual contamination film on the filter screen surface after each rotation. This film progressively reduces the effective open screen area, causing melt pressure to rise and throughput to fall. On a heavily loaded PCR line, a blade worn beyond its service limit can cause a 15–25% throughput reduction and accelerate screen clogging to the point of breakthrough failure. Monitoring melt pressure differential across the filter is the most reliable wear indicator — we recommend blade inspection when differential pressure rises more than 20% above baseline.

For standard PCR HDPE and PP pellet production targeting film or injection moulding applications, specify 300–500 µm filtration fineness. This removes hard particles that cause die-face streaking and surface defects without excessive pressure drop on moderately contaminated feedstock. For food-grade contact recycled resin (rHDPE, rPP under EU 10/2011), specify 150–200 µm to meet the stricter contamination removal requirements. For highly contaminated agricultural film or MSW-derived feedstock, start with 500–800 µm to manage pressure and step down as the input quality improves.

This is the most important question to ask any aftermarket blade supplier. Sureay engineers a deliberate hardness differential: filter plates are plasma nitrided to HV 1,000+ (approximately HRC 70+), and scraper blades are manufactured to a strictly controlled HRC 58–62. The blade is always softer than the plate surface — it functions as a controlled-wear consumable that gradually wears away without generating metal-transfer scoring or gouging on the harder plate face. Every shipment includes a Rockwell HRC test certificate confirming the blade is within this range. If a supplier cannot provide this certificate, you have no guarantee the hardness differential is correct.

Yes, fully compatible. Sureay filter plates are designed and FEA-validated for OEM-rated backflush pulse pressures (typically 150–400 bar on Ettlinger ERF and Gneuß RSFgenius systems). The conical laser-drilled hole geometry enhances backflush efficiency: the wider downstream outlet acts as a nozzle that accelerates the reverse pulse through each perforation, improving contaminant ejection versus cylindrical-hole plates. Hole array layout and plate dimensions replicate OEM specifications exactly — no recalibration of backflush timing, pressure, or controller parameters is required after installation.

This is the symptom of silent hole enlargement — a failure mode where filter plate micro-perforations gradually widen due to chemical corrosion of the hole walls rather than mechanical wear. Enlarged holes allow oversized contaminant particles through while maintaining low differential pressure because the wider holes offer less resistance. The root cause is almost always HCl outgassing from PVC or organochlorine contamination in the feedstock reacting with standard tool steel at melt temperatures. Confirm by: (1) measuring output melt contamination particle size — if oversized particles are present without pressure rise, hole enlargement is confirmed; (2) inspect a removed plate under magnification for hole-wall pitting or rounding. The solution is to specify Sureay PVD-coated, corrosion-resistant PM steel filter plates, which seal the micro-perforation walls against acid diffusion and prevent the insidious progressive enlargement.

Yes. Send us your existing blade sample or the OEM part number and machine model. We will dimensionally verify the blade profile on our CMM, confirm the mounting interface, edge bevel angle, and material specification, and supply direct drop-in replacements. For EREMA Continuous Filter and Gneuß Rotary Filtration Systems, we maintain reference drawings for the most common platform sizes. Lead time for standard replacement blades is 7–12 working days from dimension confirmation.

On a mixed PCR rigid plastics line (HDPE/PP, < 3% mineral contamination, melt temperature 230–260 °C), D2 scraper blades typically deliver 400–700 operating hours before the edge profile degrades to the point of rising differential pressure. H13 blades on the same line extend service intervals to 600–1,000 hours. On highly abrasive streams (glass-filled compounds, agricultural film with embedded soil), D2 service life drops to 150–300 hours; H13 extends this to 250–450 hours; solid carbide delivers 1,000–2,000+ hours on these feedstocks.