Injection molding factories generate 5-15% of material as in-house scrap-sprues, runners, defective parts, color-change waste. Left unsorted, this scrap either goes to landfill (cost) or to third-party recyclers (lost value). The ZL-PC300 Injection Molding Scrap Crusher turns this scrap into clean, uniform flake that can be directly re-fed to molding machines-saving 80-95% of virgin material cost on the recovered portion.
For injection molding factories producing 50-500 kg/day of scrap (typical for 5-15 molding machine operations), the ZL-PC300's 220-300 kg/h capacity handles all in-house scrap within a single 8-hour shift. The 6-8mm screen output is ideal for direct re-feed to molding machine hoppers (combined with virgin material at 10-30% ratio per most polymer specifications).
| Parameter | Value |
|---|---|
| Model | ZL-PC300 |
| Motor Power | 5.5 kW (3-phase, custom voltage available) |
| Capacity | 220-300 kg/h sustained (PET bottle flakes, <5% moisture) |
| Rotating Blades | 9 pcs SKD-11 (HRC 60-62) |
| Fixed Blades | 2 pcs SKD-11 (matched set) |
| Feed Opening | 310 x 220 mm (accommodates whole 2L bottles, larger rigid items) |
| Screen Mesh | 8mm default (6/10/12/14/16/18/20mm interchangeable) |
| Rotor Speed | 500 RPM (low-speed high-torque for clean cuts) |
| Noise Level | Max 85 dB at 1m |
| Net Weight | 300 kg |
| Machine Size | 1100 x 730 x 1200 mm |
| Power Supply | 3-phase 380V/50Hz (220V/415V/440V/480V custom available) |
| Compliance | CE, ISO 9001, IEC 60204-1 |
Injection molding operations produce several types of in-house scrap, each with different characteristics and value:
| Scrap Type | Description | % of Molding Output | Re-feed Suitability |
|---|---|---|---|
| Sprues | Main injection channel from nozzle to part | 2-5% | 100% (same resin, same color) |
| Runners | Distribution channels from sprue to cavities | 3-10% | 100% (same resin, same color) |
| Defective Parts | Parts with defects (short shot, flash, color, dimension) | 1-3% | 100% (same resin, same color) |
| Color-Change Waste | Residual material from switching colors | 1-2% (per change) | Limited (mixed colors) |
| Start-up Waste | Initial parts before process stabilizes | 0.5-1% | 100% (same resin, same color) |
| Total In-House Scrap | Sum of all above | 5-15% | 80-95% recoverable |
By material type:
For injection molding factories, in-house scrap recovery delivers direct cost savings by reducing virgin material purchase. Here's a detailed ROI calculation for a typical 10-machine molding operation producing 200 kg/day of scrap:
| Item | Calculation | Annual (USD) |
|---|---|---|
| Scrap Generated | 200 kg/day x 300 days/year | 60,000 kg/year |
| Recoverable Scrap (90%) | 60,000 x 90% | 54,000 kg/year |
| Virgin Resin Cost (PP, for example) | Per ton | USD 1,500 |
| Recovered Flake Cost (processing) | Per ton (energy + labor + blade) | USD 200 |
| Net Savings per Ton | USD 1,500 - 200 | USD 1,300/ton |
| Annual Net Savings | 54,000 kg x $1.30/kg = 54 tons x $1,300 | USD 70,200/year |
| ZL-PC300 Investment | One-time | USD 1,050 |
| Payback Period | USD 1,050 / USD 70,200 annual | 5.5 days |
| 5-Year Net Savings | USD 70,200 x 5 - 1,050 | USD 350,000 |
Why this ROI is achievable: For molding factories using commodity resins (PP, PE, PET), recovered flake quality is sufficient for 20-30% re-feed ratio with minimal property loss. Total cost savings scale directly with material price-PP at $1,500/ton saves $1,300/ton recovered; higher-price resins (engineering plastics at $3,000-5,000/ton) save even more.
For injection molding operations, recovered flake quality directly impacts finished part quality. The ZL-PC300's output must meet specific consistency standards for re-feed:
Quality control workflow:
For maximum efficiency, the ZL-PC300 can be integrated directly with molding machines via conveyor feeding and pneumatic conveying of recovered flake. Three integration levels are common:
Closed-loop system example (5-machine operation):
Q1: What types of injection molding scrap can the ZL-PC300 process?
Sprues, runners, defective parts, color-change waste, start-up waste. Compatible materials: PP, PE, PET, ABS, PS, PC, PA (with drying for hygroscopic). For multi-material operations, sort scrap by resin type before crushing.
Q2: Can the PC300 be integrated with molding machines for automated scrap recovery?
Yes. Three integration levels: manual (operator), conveyor-fed (semi-automatic), closed-loop pneumatic (fully automatic). Most common is conveyor-fed for 5-15 machine operations. Closed-loop systems for 20+ machine operations.
Q3: What screen mesh produces flake suitable for direct molding machine re-feed?
6-8mm screen is recommended. Smaller screens (4-6mm) produce finer flake (may cause dust issues in hopper); larger screens (10-12mm) produce chunks that may not feed smoothly into molding machine throat.
Q4: How much scrap can the PC300 recover from a typical molding operation?
Typical molding operations generate 5-15% scrap by weight. For a 10-machine operation producing 200 kg/day scrap, the PC300 processes all of it in 1-2 hours. Most operations process scrap in batches (once per shift or once per day).
Q5: Can the PC300 handle engineering plastics (ABS, PC, PA)?
Yes. ABS processes well at 6-8mm screen. PC (polycarbonate) processes well but generates more heat-recommend reduced feed rate. PA (nylon) is hygroscopic-recommend drying recovered flake before re-feed to molding machine.
Q6: What's the typical payback period for an injection molding factory using ZL-PC300?
For typical molding operations (5-15 machines, 50-500 kg/day scrap), payback is 1-4 weeks. The PC300's USD 1050 cost is recovered via virgin material savings (USD 1,300-3,500/ton for PP/PE/PET, more for engineering plastics).
Q7: Can the ZL-PC300 handle multi-color scrap (e.g., color-change waste)?
Yes, but mixed-color flake has limited re-feed use. Most molding operations separate color-change waste and either: (a) re-feed at low ratio (5-10%) for dark colors only, or (b) sell as mixed-color scrap to third-party recyclers.
Q8: How does the PC300 compare to grinding machines (beside-the-press grinders)?
Beside-the-press grinders (e.g., Wittmann, Rapid granulators) are smaller, designed for one molding machine each. The PC300 is a central crusher for 5-15+ machines. PC300 has higher capacity (220-300 kg/h vs 50-100 kg/h for beside-the-press). Cost: PC300 USD 1050 vs beside-the-press USD 3000-8000 each.
Q9: Can the PC300 handle glass-fiber-reinforced plastics (e.g., glass-filled PA)?
Glass fiber is highly abrasive-reduces blade life 60-80%. The PC300's SKD-11 blades can handle but require frequent rotation/replacement. Recommend tungsten carbide blades for high-glass-fiber applications (USD 800-1200 per set vs USD 350 for SKD-11).
Q10: What's the FOB price and lead time for the ZL-PC300 Injection Molding Scrap Crusher?
FOB price: USD 1050/set. MOQ: 1 set. Lead time: 15 working days. For molding factory integration packages (PC300 + conveyor + blender), quote on request. Volume discounts available for 5+ units.
Injection molding operations generate three categories of scrap: (1) Sprues from the main injection channel connecting barrel to mold, typically 50-150g per shot depending on part size, (2) Runners from multi-cavity mold distribution channels, typically 20-80g per shot, and (3) Defective parts from quality rejection at 2-8% reject rate depending on process control. Combined scrap rate is typically 8-15% of total polymer consumption. The ZL-PC300 injection molding scrap crusher is positioned between the molding machine and the granulator/hopper loader to recover this scrap into reusable feedstock. Workflow: (1) Sprues and runners collected in Gaylord boxes or conveyor at the molding machine exit, (2) Defective parts sorted by polymer type and color code to prevent cross-contamination, (3) Mixed scrap loaded into ZL-PC300 hopper via conveyor or manual feed at 50-80 kg per batch, (4) ZL-PC300 crushes to 6-8mm flakes at 220-300 kg/h depending on wall thickness and polymer, (5) Crushed flakes conveyed to material handling system (Zillion ZL-AL800 autoloader) for direct re-feed to molding machine hopper. Closed-loop recovery rate: ZL-PC300 enables 95-98% in-process scrap recovery versus 60-70% with manual collection and external recycling.
The ZL-PC300 injection molding scrap crusher is tuned for engineering plastics common in injection molding: PP (polypropylene) at 25-30% of all injection molded parts, ABS at 15-20%, nylon (PA6, PA66) at 10-12%, PC (polycarbonate) at 8-10%, POM at 5-8%, and engineering blends (PC/ABS, PA/PP) at remainder. Each polymer has distinct crushing characteristics: PP is soft and ductile, requiring sharp blades and screen aperture 8mm or smaller to prevent flake agglomeration; ABS is rigid and brittle, crushing easily at 10-12mm screen with low fines generation; nylon is tough and fibrous, requiring 460 RPM rotor and tempered blades to prevent smearing; PC is hard and notch-sensitive, requiring low-impact crushing action to prevent stress cracking in output. ZL-PC300 with 9 SKD-11 blades and adjustable screen aperture handles all five polymers at rated throughput with blade rotation per material: PP every 5 days, ABS every 7 days, nylon every 4 days, PC every 10 days, POM every 14 days. For molding shops running multiple polymers, ZL-PC300 is configured with material-specific screen sets purchased separately.
Injection molding scrap recovery traditionally uses a granulator (also called beside-the-press granulator or auger granulator). The ZL-PC300 crusher differs from a granulator in three operational respects. First, throughput: ZL-PC300 at 220-300 kg/h is 3-5x higher than typical molding-machine-side granulators at 50-80 kg/h, making it suitable for centralized scrap recovery rather than per-machine granulation. Second, feed format: granulators accept small sprues and runners directly from the molding machine exit, while ZL-PC300 accepts larger items including defective parts up to 310x220mm. Third, output destination: granulators feed directly back to the molding machine hopper via vacuum autoloader, while ZL-PC300 typically feeds to a central recycling station or intermediate storage. For molding shops with 3 or fewer machines producing similar parts, granulator economics favor per-machine granulators. For shops with 5+ machines, mixed parts, or engineering plastics requiring careful handling, ZL-PC300 centralized crusher is more economical.
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