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Product Description
The ZJF Series Spring PVC Powder Feeder is a purpose-built automatic feeding machine engineered for continuous, dust-free conveying of PVC powder and other free-flowing thermoplastic powders into extruder hoppers. Designed as a critical auxiliary unit for extrusion lines, the ZJF series employs a proven spring screw conveying mechanism paired with automatic level control to deliver hands-free operation, consistent material flow, and zero spillage throughout the production cycle.
Available in three models — ZJF100, ZJF300, and ZJF700 — the series covers rated throughputs from 100 kg/h to 700 kg/h, with maximum capacities reaching 1,000 kg/h. Each unit integrates a top-loading hopper, intermediate storage tank, spring-driven transfer tube, and intelligent control system into a compact, modular footprint. The fully enclosed conveying path prevents airborne dust contamination, making the ZJF series suitable for both general industrial environments and facilities with strict cleanliness requirements.
As part of Chenxing Machinery's comprehensive auxiliary equipment lineup, the ZJF feeder seamlessly pairs with single-screw and twin-screw extruders, high-speed mixers, and downstream pelletizing systems to form a complete automated material handling chain for PVC pipe, profile, sheet, and compounding operations.
| Parameter | ZJF100 | ZJF300 | ZJF700 |
|---|---|---|---|
| Rated Conveying Capacity (kg/h) | 100 | 300 | 700 |
| Max. Conveying Capacity (kg/h) | 200 | 450 | 1,000 |
| Hopper Capacity (kg) | 100 | 120 | 150 |
| Storage Tank Capacity (kg) | 120 | 150 | 200 |
| Spring Diameter (mm) | 30 | 36 | 59 |
| Transfer Tube Length (m) | 3 | 3–5 | 3–5 |
| Motor Power (kW) | 1.1 | 1.1 | 2.2 |
| Overall Dimensions (mm) | 850 × 620 × 740 | 905 × 655 × 840 | 950 × 950 × 960 |
| Net Weight (kg) | 120 | 150 | 250 |
| Voltage | 380V 50Hz 3-Phase (Customizable) | 380V 50Hz 3-Phase (Customizable) | 380V 50Hz 3-Phase (Customizable) |
| Control Mode | Automatic Level Control | Automatic Level Control | Automatic Level Control |
| Enclosure Type | Fully Enclosed | Fully Enclosed | Fully Enclosed |
Note: Rated capacities are measured under standard operating conditions with free-flowing PVC powder. Maximum capacities represent peak throughput under optimal conditions. All specifications are subject to confirmation; please contact our engineering team for application-specific data.
ZJF100: Ideal for laboratory-scale extrusion lines, small-diameter PVC pipe production (≤50 mm), and pilot-plant operations. Pairs well with compact single-screw extruders.
ZJF300: Suitable for medium-volume PVC profile, pipe (50–160 mm), and sheet extrusion. Balances throughput with energy efficiency for continuous shift operations.
ZJF700: Engineered for high-output twin-screw extrusion lines producing large-diameter PVC pipes (≥160 mm), thick sheets, and WPC profiles. Delivers up to 1,000 kg/h peak capacity for demanding production schedules.
The ZJF series integrates material level sensors in the storage tank that continuously monitor powder inventory. When the level drops below the preset low threshold, the controller automatically starts the motor to replenish the tank. Once the high-level setpoint is reached, the motor stops. This closed-loop, start-stop cycle eliminates manual intervention, reduces labor costs, and ensures the extrusion line never runs dry during production.
Unlike pneumatic or vacuum conveying systems that require high-power blowers, the ZJF screw feeder uses a rotating helical spring housed inside a smooth-bore transfer tube. The spring's rotational motion pushes powder forward through mechanical displacement. With motor power as low as 1.1 kW for the ZJF100 and ZJF300 models, energy consumption is minimal. The spring mechanism has no internal bearings, seals, or wear-prone components in the material path, which substantially reduces maintenance frequency and spare parts costs.
The entire material path — from hopper inlet to extruder discharge point — is fully enclosed. This design prevents PVC powder dust from escaping into the production environment, protecting operator health and maintaining workplace cleanliness. For facilities operating under GMP, ISO 14001, or other environmental management standards, the ZJF feeder's dust-containment capability is a critical compliance asset. Combined with a high-speed mixer and vibrating screen, the system forms a contamination-controlled powder handling chain.
Each ZJF model uses a progressively larger spring diameter — 30 mm, 36 mm, and 59 mm — matched to its throughput class. Larger-diameter springs generate higher driving torque, enabling reliable conveying of higher-volume or slightly cohesive PVC powder batches without clogging. This gradient design ensures that each model operates within its mechanical sweet spot, avoiding the inefficiencies of an oversized or undersized drive train.
The ZJF feeder is designed to interface with virtually all extruder types used in PVC processing. It connects seamlessly to single-screw extruders for small to medium lines and twin-screw extruders for high-output compounding and pelletizing. The discharge tube can be configured with standard flange adapters to match different extruder hopper geometries. This versatility allows a single feeder model to support multiple downstream machines as production needs evolve.
The ZJF series is built around independent, bolt-together modules: hopper assembly, storage tank, spring drive unit, transfer tube, and control panel. This modular architecture simplifies on-site installation — each module can be moved through standard doorways and assembled in sequence. For maintenance, individual modules can be accessed or replaced without disassembling the entire machine. The spring element itself can be extracted from the tube for periodic fatigue inspection and replacement.
With transfer tube lengths ranging from 3 to 5 meters, the ZJF300 and ZJF700 models can accommodate varied distances between the raw material staging area and the extruder intake. This flexibility reduces the need for plant layout compromises — the feeder can be positioned optimally relative to a plastic crusher, mixer, or other upstream equipment without being constrained by fixed tube geometry.
The control system includes integrated overload protection that monitors motor current draw. In the event of a material blockage or mechanical jam, the controller cuts power before damage occurs to the motor, spring, or gearbox. The drive assembly is fully guarded with a removable safety cover, and all electrical components meet CE safety standards. Emergency stop functionality is standard.
The ZJF Spring PVC Powder Feeder operates on a simple yet effective three-phase cycle:
PVC powder is loaded into the top hopper, which gravity-feeds into the intermediate storage tank. A level sensor continuously monitors the powder height inside the tank. When the powder level falls below the low-level setpoint — indicating that the downstream extruder has consumed sufficient material — the controller activates the drive motor.
The motor, coupled through a reduction gearbox, rotates the helical spring element inside the transfer tube. As the spring turns, its coils act as a series of moving cavities that mechanically push powder from the storage tank outlet along the tube toward the extruder hopper. The spring does not directly contact the tube wall under normal load — instead, powder forms a thin lubricating layer between the spring and the tube interior, reducing friction and wear. This is a fundamental advantage over rigid screw feeder designs, where metal-to-metal contact generates heat and accelerates wear.
When the storage tank powder level reaches the high-level sensor setpoint, the controller de-energizes the motor. Conveying stops immediately. The tank holds sufficient buffer material to supply the extruder for several minutes of continuous operation, preventing frequent motor cycling. As the extruder continues to consume powder, the level gradually drops, and the cycle repeats. This on-demand operation mode reduces energy consumption compared to continuous-run systems and extends motor and spring service life.
The key mechanical advantage of the spring conveying principle is its inherent flexibility: the spring can navigate gentle bends in the transfer tube without requiring intermediate bearings or couplings. This allows the ZJF series to route material around existing plant infrastructure, avoiding the straight-line constraints of rigid screw conveyors.
The ZJF feeder is extensively deployed in PVC pipe extrusion lines producing water supply pipes, drainage pipes, electrical conduits, and spiral-reinforced pipes. The feeder's consistent powder delivery directly impacts pipe wall thickness uniformity and surface finish quality. For high-speed pipe lines producing diameters from 20 mm to 630 mm, the ZJF700 model with its 700 kg/h rated capacity provides the sustained feed rate necessary to maintain line speed without starvation-induced defects.
In window frame, door frame, cable tray, and decorative trim production, the ZJF feeder supplies compounded PVC dry blend to twin-screw extruders. Profile extrusion demands precise formulation consistency — any interruption in powder feed can alter the compound residence time in the barrel, causing color shifts or dimensional drift. The ZJF's automatic level control maintains a constant extruder hopper level, stabilizing back-pressure and thermal history.
For WPC foam board extrusion lines, PVC roofing sheets, and industrial panels, the ZJF feeder integrates with high-output conical twin-screw extruders. The ZJF700 model delivers sufficient throughput to match extruders operating at 300–600 kg/h, ensuring the Celuka process or free-foam expansion is not compromised by intermittent feeding.
In PVC hot-cutting pelletizing lines and compounding operations, the ZJF feeder transfers PVC powder from mixers to compounding extruders. The enclosed conveying path prevents cross-contamination between batches — critical for color masterbatch and specialty compound production where even trace carryover can ruin a full batch. After pelletizing, downstream vibrating screens classify pellets by size.
In plastic recycling solutions that process post-industrial PVC scrap, the ZJF feeder can convey reclaimed PVC powder from disc grinding pulverizers or plastic grinding machines back to the extrusion or pelletizing line. The spring mechanism handles recycled powder with up to 20–30% regrind content without bridging or rat-holing, provided the powder remains free-flowing.
The ZJF Spring PVC Powder Feeder functions as the critical link between bulk material preparation and precision extrusion. A typical integrated system comprises:
Raw Material Intake: PVC resin, stabilizers, fillers, and additives are batched and charged into a high-speed mixer for dry blending and heating.
Intermediate Storage: The compounded dry blend is discharged into a buffer silo or directly into the ZJF feeder's top hopper.
Automatic Conveying: The ZJF feeder, controlled by its integral level sensor, transfers the powder blend through the enclosed transfer tube to the extruder feed throat.
Extrusion and Downstream: The extruder melts, homogenizes, and pumps the material through a die. Downstream equipment — calibrators, cooling tanks, haul-offs, cutters, and pelletizers — completes the production.
The ZJF feeder can also be positioned between a crushing and grinding machine and a pelletizing extruder in recycling applications, creating a closed-loop material recovery circuit. Chenxing Machinery provides turnkey system engineering to ensure proper mechanical interfacing, control signal integration, and throughput balancing across all connected equipment.
Chenxing Machinery, headquartered in Zhangjiagang City, Jiangsu Province, has specialized in plastic processing and auxiliary equipment manufacturing for over 20 years. Our factory-direct business model delivers verified quality at competitive pricing, and our integrated product ecosystem — covering crushers, mixers, extruders, pelletizers, pulverizers, vibrating screens, and material handling equipment — makes us a single-source partner for complete PVC processing lines.
ISO & CE Certified: All ZJF feeders are manufactured under ISO 9001 quality management and carry CE certification.
Factory Testing: Each machine undergoes a pre-delivery test run with PVC powder to validate throughput, control logic, and mechanical integrity.
Global Support: Remote commissioning via video call, optional on-site engineer dispatch, and lifetime technical support.
Custom Engineering: Voltage customization (380V 415V 480V / 60Hz), PLC integration, stainless steel contact parts, and custom tube lengths available on request.
The ZJF spring feeder uses mechanical spring conveying, while vacuum loaders use negative air pressure. Spring conveying consumes significantly less energy — 1.1–2.2 kW versus vacuum systems that typically require 3–7.5 kW blowers. Spring feeders are also quieter, do not require filter maintenance, and are better suited for continuous, high-volume PVC powder conveying over short to moderate distances. However, vacuum loaders may offer advantages for very long conveying distances (>10 m) or when handling multiple pickup points.
Yes. While specifically designed for PVC dry blend, the ZJF series can convey other free-flowing thermoplastic powders including PE, PP, and certain WPC formulations. However, materials with high moisture content, strong electrostatic charge, or poor flow characteristics (tendency to bridge or cake) should be tested before purchase. Chenxing Machinery offers material trial runs at our Zhangjiagang factory to validate compatibility with your specific feedstock.
Spring service life depends on operating hours, material abrasiveness, and conveying load. Under normal conditions with PVC powder at rated capacity, the stainless steel spring typically requires inspection every 3,000–4,000 operating hours and replacement at 8,000–10,000 hours. Operators should watch for decreased conveying rate or unusual vibration as early indicators of spring fatigue. The modular design allows spring extraction and replacement within approximately 2 hours by one technician.
Yes, the ZJF series is fully compatible with both extruder types. The discharge tube can be fitted with standard bolt-flange adapters to match the feed throat geometry of most single-screw and conical/parallel twin-screw extruders. For lines switching between different extruder types, quick-change adapter plates can be supplied. The control system operates independently of the extruder's PLC, requiring only a dry-contact interlock signal to pause feeding during extruder shutdown.
Each ZJF model requires a level floor area corresponding to its footprint dimensions plus 1 meter of clearance on all sides for maintenance access. The transfer tube should be routed with minimal bends (ideally straight or gentle curves only) to maintain conveying efficiency. Electrical connection requires a standard 3-phase supply plus a single-phase control circuit. Installation typically takes one shift (8 hours) with basic lifting equipment and two technicians. No special foundation is required — the base frame mounts on level concrete or steel platforms.
The standard transfer tube length is 3–5 meters. Lengths beyond 5 meters are possible but require engineering evaluation to confirm that the spring element can generate sufficient conveying force without excessive deflection or torque demand. For applications requiring longer conveying distances, Chenxing Machinery's ZD series screw feeder with higher motor power may be a more suitable alternative. Contact our engineering team with your specific layout drawing for a feasibility assessment.
No. The ZJF spring feeder is purely electromechanical — it requires only a 3-phase electrical supply (plus control power). It does not need compressed air, cooling water, or any other plant utility. This simplifies installation and eliminates ongoing utility costs associated with pneumatic conveying systems. The only consumable is the spring element, which is replaced on a preventive maintenance schedule.
Ready to integrate the ZJF Series Spring PVC Powder Feeder into your extrusion line? Follow these four steps to receive a tailored quotation:
Specify your feedstock: PVC dry blend formulation (compound type, additives), bulk density (if known), and any special characteristics (moisture sensitivity, electrostatic tendency, abrasive fillers). If you are conveying recycled powder from a plastic pulverizer, mention the regrind percentage and particle size distribution.
Indicate your required conveying capacity (kg/h), the distance between your raw material source and extruder feed point, any vertical lift required, and the extruder type and model. A simple sketch or photo of your plant layout will speed up the engineering review.
Within 24 business hours, our engineering team will provide a detailed proposal including the recommended ZJF model, configuration options (voltage, tube length, adapter flange), shipping terms (FOB/CIF/C&F), and estimated delivery lead time.
Optionally send 50–100 kg of your actual PVC powder for a trial run at our Zhangjiagang factory. We record throughput, energy consumption, and conveying stability data for your evaluation. After confirmation, we manufacture, test, and ship your machine with full documentation and installation support.
Contact Nicole directly:
Phone WhatsApp WeChat: +8615951187228
Email: ceo@cxsljx.com
Company: Zhangjiagang Chenxing Machinery Co., Ltd.
Website: www.chenxingmachinery.com
We respond to all inquiries within one business day. For urgent requests, WhatsApp messages typically receive a reply within 2 hours during China business hours (UTC+8, 8:00–18:00).
