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NANJING ALAS INTERNATIONAL CO., LTD
Views: 60 Author: Site Editor Publish Time: 2026-05-30 Origin: Site
In the plastic recycling sector, equipment selection and wear part management directly dictate production capacity, operational costs and profit margins. Many small-scale recyclers only focus on the upfront purchase price of shredders while overlooking proper blade material selection. The consequence is frequent blade replacement, prolonged production downtime, inconsistent pellet quality and soaring per-ton processing expenses.
As a professional manufacturer specializing in R&D and production of recycling machine blades, AlasMachinery receives countless consultation requests from small recycling operators on a daily basis. We find most clients can afford quality equipment but lack professional knowledge to match optimal machine configurations and blade grades to their actual waste materials.
This guide is compiled to help small recyclers build cost-effective, durable recycling production lines with scientific equipment and blade matching solutions.
Most small recycling plants run a daily throughput below 5 tons (300–800 kg/h). Three mainstream shredder types serve distinct purposes within this capacity range.
Equipment Type | Core Advantages | Limitations | Ideal Applications |
|---|---|---|---|
Single-Shaft Shredder | High versatility, adjustable output size with screen mesh, cost-effective | Lower efficiency for extra-large rigid scraps | PE film, PP woven bags, PET bottle flakes, injection sprues, small-diameter plastic pipes |
Double-Shaft Shredder | High torque, robust for contaminated mixed scraps with minor metal impurities | Prone to film wrapping, higher equipment cost and power consumption | Large plastic drums, plastic pallets, automotive bumpers, thick-walled plastic tubing |
High-Speed Granulator | Fine granular final output (rice-sized), ideal for downstream pelletizing | Precise structure only for clean, brittle rigid plastics | Post-shredding fine crushing paired with primary shredders |
Main Recycled Material | Recommended Primary Machine | Optimal Configuration | Investment Reference (Small-Scale Unit) |
|---|---|---|---|
Soft plastics: plastic film & woven sacks | Single-Shaft Shredder | Single-shaft shredder + high-speed granulator (best-value combo) | USD 1,900–16,500 |
Thick rigid plastics (ABS/PC/drums/pipes) | Double-Shaft Shredder | Double-shaft shredder + high-speed granulator | USD 4,100–45,500 |
Mixed soft & hard plastics | Single-shaft shredder (cost priority) / Double-shaft shredder (universal feed tolerance) | Optional extra granulator | USD 1,900–23,400 |
Tip for Small Operators: The single-shaft shredder plus high-speed granulator set delivers the highest cost performance. It handles most soft and regular hard plastics with uniform output, perfect for finished scrap sales or in-house pelletization.
Even with well-selected shredding machines, blades – the most frequently replaced consumable part for shredders, granulators and pelletizers – dominate long-run production costs. Countless recyclers opt for cheap carbon steel blades to cut initial spending, only suffering frequent sharpening and replacement that inflate total expenditure.
9CrSi stands as the most widely used cost-effective blade grade for facilities processing clean soft plastics including PE/PP film, woven bags and regular PET flakes.
Hardness: HRC 58–62, balanced wear resistance with low edge curling risk
Moderate unit price, perfectly suited for daily output under 5 tons
Best pick for cost-conscious recyclers receiving clean incoming feedstock
Upgrade to premium blade materials if your feed covers:
Glass fiber-reinforced (GF) engineering plastics
High-hardness rigid scraps (ABS, PC, POM etc.)
Mixed waste contaminated with sandstone or sporadic metal fragments
Material Grade | Key Properties | Application Scenarios |
|---|---|---|
SKD11 / D2 | High hardness & superior abrasion resistance | Rigid plastics under medium-wear working conditions |
DC53 | Better toughness and wear resistance vs SKD11, outstanding chipping resistance | Glass-filled plastics and high-impact shredding tasks |
HSS High-Speed Steel | Excellent red hardness and heat resistance | High-speed granulators and pre-processing for precision pelletizing |
Field proven data: DC53 blades extend service life by 200%–300% compared to ordinary carbon steel when shredding 30% glass-filled reinforced plastics. Despite higher upfront procurement cost, per-ton blade consumption drops sharply over long-term operation.
Carbide tipped blades are designed for extreme high-abrasion working conditions: soil-covered agricultural film, coastal recycled plastic with sand grit, and scrap mixed with fine metal particles.
Hardness HRC 89–93 with exceptional anti-abrasion performance
Service life 3–5 times longer than conventional tool steel blades, drastically cutting downtime for blade replacement and maintenance
Drawback: Higher purchase cost; limited regrind cycles and strict precision requirements during installation
Recycled Raw Material | Suggested Blade Grade | Core Reason |
|---|---|---|
Clean PE film, PP woven bags & regular bottle flakes | 9CrSi | Lowest comprehensive cost with fully matched performance |
Mixed rigid engineering plastics (ABS, HIPS, PC etc.) | SKD11 or D2 | Enhanced wear resistance to cut frequent replacement downtime |
Glass-filled plastics & crushed automotive plastic scrap | DC53 | Balanced toughness and abrasion resistance against edge chipping |
Muddy farm film & coastal sand-contaminated waste plastics | Tungsten Carbide Tipped Blades | Top-tier wear resistance for minimal long-run operational cost |
Thick heavy-wall rigid pipes & large-size injection sprues | DC53 or High-Speed Steel | Optimized for combined heavy impact and abrasive wear |
Correct material specification is only half the solution. Even with identical steel grade, inconsistent forging, heat treatment and machining precision across different foundries can lead to several-fold differences in blade service life.
This explains why growing numbers of small recycling plants source blades directly from specialized manufacturers instead of generic low-cost aftermarket spare parts.
AlasMachinery is an experienced professional blade maker focusing on plastic recycling consumables, supplying global recyclers with full-spectrum solutions:
✅ Complete blade material portfolio
Full product range from economical 9CrSi to industrial-grade SKD11, D2, DC53, high-speed steel and carbide tipped variants. Customized blade formulas available for soft film, rigid scrap, glass-filled feed and gritty agricultural plastic.
✅ Non-standard custom blade fabrication
Shredder and granulator blades vary drastically across different machine brands. AlasMachinery produces dimensionally accurate replacement blades against customer drawings or used sample parts for seamless equipment fitting.
✅ Strict heat treatment & quality control
Up to 70% of blade durability relies on heat treatment. We implement vacuum quenching, cryogenic treatment and multi-step tempering to deliver uniform hardness, refined grain structure and minimized retained austenite, greatly boosting anti-wear and anti-chipping performance.
✅ Custom spare blade package recommendation for small enterprises
Our engineering team calculates economical replacement cycles based on clients’ feed type, daily output and machine model, advising a spare blade set on initial purchase to avoid unplanned production halt caused by sudden blade failure.
"We previously ran low-cost carbon steel blades for glass-filled ABS recycling and needed blade sharpening every three days, driving up recurring maintenance costs. After switching to DC53 blades from AlasMachinery, one full month of continuous operation is possible before regrinding required. Though blade unit price is higher, our per-ton production cost has fallen by 40%."
– A small modified plastic recycler based in Zhejiang Province, China
Optimize core machine layout: Single-shaft shredder for soft-dominant feed; double-shaft shredder for heavy rigid or heavily contaminated scrap; add a high-speed granulator for fine downstream crushing if budget permits.
Avoid inferior blade materials: 9CrSi for clean soft plastics, DC53/SKD11 for rigid/glass-filled scraps, carbide tipped blades for heavily abrasive grit-laden feed.
Cooperate with professional blade suppliers like AlasMachinery offering material consulting, custom manufacturing, full QC and aftersales support, helping recyclers slash overall per-ton operating cost by 30%–50%.
If you struggle with frequent unplanned downtime, short blade lifespan or uneven shredded particle size, reach out to AlasMachinery’s technical team. Submit your waste material samples and equipment specifications to receive free professional blade selection advice.
Nanjing Alas International Co., Ltd. is a professional industrial tooling manufacturer focused on shear blades, bending dies, shredder blades, and custom wear parts. We offer full application engineering, material selection, setup guidance, and after-sales support to global customers.
Tell us your requirements, and our engineering team will provide professional solutions for blade specification, tool life optimization, and cost-effective production.