| Application |
Product type and PE grade |
Film, pipe, profile, sheet, cable coating, or pelletizing; common materials include LDPE, LLDPE, HDPE, and recycled PE blends. |
Request a material-processing matrix showing grades, melt-flow ranges, additives, recycled content, and maximum approved operating conditions. |
A line optimized for one PE product may not deliver stable quality on another. Specify the full product mix before comparing quotations. |
| Capacity |
Required output and utilization |
Small profile or laboratory lines: approximately 10–80 kg/h; medium film or pipe lines: approximately 80–500 kg/h; larger industrial systems can exceed 500 kg/h. |
Compare guaranteed output at the actual resin, product size, screw speed, die, cooling system, and acceptable scrap rate. |
Do not select capacity from the maximum nameplate value alone. A practical design target is often 70–85% of the supplier’s stated maximum output. |
| Screw and Barrel |
Screw diameter, L/D ratio, and material construction |
Screw diameters commonly range from about 30–150 mm for many general-purpose PE lines; L/D ratios of approximately 24:1–33:1 are frequently used, depending on application. |
Check engineering drawings, metallurgy, surface treatment, screw design, wear allowance, and spare-parts specifications. |
Longer screws can improve melting and mixing but may increase residence time, energy use, and replacement cost. |
| Output Stability |
Melt pressure, temperature, and weight consistency |
For a qualified product and stable raw material, target steady melt temperature variation of approximately ±2–3 °C and controlled pressure fluctuation appropriate to the process. |
Review factory acceptance test data, trend charts, sample dimensions, and continuous operation records rather than one-time readings. |
Stable output reduces start-up waste, thickness variation, downstream interruptions, and operator intervention. |
| Drive System |
Motor power, speed control, and torque reserve |
Motor size depends on screw diameter, output, resin, and pressure; many industrial single-screw PE lines use variable-speed drives for controlled screw speed and soft starting. |
Request rated power, overload capability, speed range, power-factor data, control cabinet drawings, and protection ratings. |
Avoid comparing motor kilowatts without checking guaranteed output, specific energy consumption, and torque at the required operating point. |
| Energy |
Specific energy consumption |
A broad planning range for many PE extrusion processes is approximately 0.20–0.60 kWh/kg, depending on product, throughput, heating method, cooling, and auxiliary equipment. |
Measure total line electricity during a defined production run, including auxiliaries, and record output in kilograms over the same period. |
Use measured kWh/kg in the total-cost model. A lower purchase price can be offset by higher energy costs over the line’s service life. |
| Heating and Cooling |
Zone control, cooling capacity, and response time |
The barrel should have independently controlled heating zones suitable for its length; cooling may use air, water, or a combination depending on output and process requirements. |
Check temperature-controller accuracy, heater protection, cooling-water flow, alarms, insulation, and recovery time after a controlled disturbance. |
Poor thermal control can cause surging, degradation, gels, inconsistent color, and unstable dimensions. |
| Filtration |
Screen changer and melt filtration |
Manual, hydraulic, or continuous screen changers may be used. Selection depends on contamination level, recycled content, pressure, output, and permitted production interruption. |
Request filtration area, screen specification, maximum operating pressure, changeover time, leakage controls, and maintenance procedure. |
Recycled PE applications usually require more robust filtration and a clear plan for pressure monitoring and screen replacement. |
| Quality Control |
Dimensional and material-performance controls |
Define product-specific limits for thickness, diameter, width, ovality, tensile performance, surface appearance, melt-flow rate, and contamination. |
Require inspection tools, calibration certificates, sampling frequency, test methods, and a documented nonconformance process. |
Quality guarantees should state measurable tolerances and test conditions, not only general claims such as “high precision.” |
| Safety Design |
Guards, interlocks, emergency stops, and hot-surface protection |
Moving parts and accessible hot zones should be guarded; access doors should use suitable interlocks; emergency-stop devices should be reachable from operating and service positions. |
Request a risk assessment, safety-circuit diagram, validation records, emergency-stop test results, and lockout/tagout instructions. |
Safety features must be verified on the delivered machine, not accepted solely from a quotation or marketing document. |
| Global Compliance |
Applicable machinery, electrical, and electromagnetic requirements |
For applicable European markets, commonly referenced frameworks include the Machinery Regulation, relevant harmonized standards, ISO 12100, ISO 13849-1, and IEC/EN 60204-1. Other markets may require local electrical, radio, or workplace-safety rules. |
Request the technical file index, declaration of conformity, risk assessment, electrical schematics, test reports, and user manual in the required language. |
Compliance responsibility should be allocated contractually between supplier, importer, integrator, and end user. |
| Electrical Compatibility |
Voltage, frequency, short-circuit rating, and control architecture |
Typical industrial supplies may include 380–415 V, three-phase, 50 Hz, but the correct configuration must match the installation site and local utility requirements. |
Confirm incoming power, transformer needs, protective-device coordination, enclosure rating, grounding method, cable requirements, and harmonic considerations. |
Incorrect electrical assumptions can create delays, redesign costs, nuisance trips, and unsafe commissioning. |
| Indicative Investment |
Equipment purchase budget |
Basic small or profile extrusion systems may start around USD 30,000–100,000; medium industrial lines often fall around USD 100,000–350,000; advanced high-output systems can exceed USD 350,000. |
Obtain itemized quotations covering extruder, die, calibration, cooling, haul-off, cutting or winding, controls, filtration, testing, and documentation. |
These are planning ranges only. Product width, automation, recycled-material handling, and downstream equipment can materially change the final price. |
| Installed Cost |
Freight, installation, commissioning, and infrastructure |
As an early planning allowance, installation, utilities, civil work, training, and commissioning may add approximately 10–30% to the equipment purchase price, depending on site readiness and scope. |
Request a responsibility matrix covering shipping terms, unloading, foundations, water and air systems, electrical work, local labor, travel, and acceptance testing. |
Compare total cost of ownership, not only the quoted machine price. |
| Operating Cost |
Labor, energy, scrap, maintenance, and consumables |
Model energy from measured kWh/kg, scrap from start-up and steady-state data, labor from required staffing, and maintenance from documented replacement intervals. |
Ask for a three- to five-year cost model using local electricity, labor, resin, logistics, and spare-parts prices. |
A line with higher automation may have a higher capital cost but lower labor, scrap, and downtime expenses. |
| Supplier Capability |
Engineering, manufacturing, testing, and service resources |
The supplier should demonstrate relevant process experience, documented quality controls, traceable component sourcing, testing capacity, and qualified commissioning personnel. |
Conduct a remote or on-site audit covering design review, machining, assembly, wiring, software control, FAT, and service-response procedures. |
Prioritize verifiable engineering and after-sales capability over an unusually low quotation. |
| Factory Acceptance Test |
Performance confirmation before shipment |
FAT should cover output, product dimensions, melt stability, alarms, safety devices, control functions, noise, energy readings, and changeover procedures using agreed materials. |
Use a signed test protocol with defined instruments, tolerances, operating conditions, sample quantities, and remedies for failed criteria. |
Link final payment and shipment approval to documented FAT results where commercially appropriate. |
| After-Sales Support |
Warranty, response time, training, and spare parts |
Define warranty duration, remote-response target, on-site support terms, operator training hours, software backup, and recommended critical spares. |
Require a spare-parts list with part numbers, material specifications, lead times, prices, and interchangeability information. |
For remote installations, local service arrangements and stocked critical parts can be more valuable than a small initial discount. |
| Contract Protection |
Guarantees, delivery, payment, and remedies |
The contract should define technical specifications, guaranteed capacity, product tolerances, delivery milestones, documentation, training, warranty, and remedies for performance shortfalls. |
Use an approved specification sheet and acceptance schedule attached to the purchase agreement. |
Avoid vague terms such as “equivalent components” unless substitutions require prior written approval and equal or better performance. |
| Final Selection |
Weighted supplier score |
A practical scoring model may allocate 30% to technical performance, 20% to total cost of ownership, 15% to safety and compliance, 15% to service, 10% to delivery risk, and 10% to supplier capability. |
Score every shortlisted proposal using the same requirements, evidence standards, and commercial assumptions. |
Select the highest-value compliant solution, not automatically the lowest initial price. |