A used plastic recycling machine should be evaluated as an engineering asset, not only as a discounted purchase. The visible frame may look sound while the expensive risks sit inside a gearbox, screw and barrel, rotor bearings, control panel or incomplete safety system. This inspection guide focuses on the evidence a buyer should collect before agreeing on price or arranging shipment.
For the wider commercial decision—when second-hand equipment fits, seller channels and contract terms—use the newer used plastic recycling machine buyer’s guide. The checklist below is intentionally narrower: it helps a technical team inspect one identified machine and define an acceptance test.
Before visiting: establish the machine identity
Ask the seller for clear photographs of the nameplate, serial number, electrical panel and all supplied modules. Confirm the manufacturer, model, year, original function, current location and whether the machine is still connected to utilities. A line advertised as “complete” may exclude conveyors, water tanks, pumps, controls, dies, screens or safety guarding that are essential to operation.
Request these records before travel:
- Original quotation or equipment specification
- Operation, maintenance and parts manuals
- Electrical drawings, P&ID and PLC/HMI backup where applicable
- Service logs, oil records and major-repair invoices
- Operating-hour or production records and the method used to verify them
- Safety documentation and declarations required at the original installation
- A list of included spares, tooling, screens, blades, dies and accessories
Do not assume the original compliance documentation automatically makes the used machine compliant at a new site. Relocation, modification, a new feed system or integration with other equipment can change the risk assessment and the obligations of the owner or integrator.
First inspection: condition before power-up
A qualified mechanical and electrical team should inspect the machine in a safe, isolated condition. Follow the site’s energy-control procedure and do not remove guards or open panels unless the equipment has been made safe. OSHA’s control of hazardous energy guidance explains why servicing requires protection against unexpected energization; local rules and the machine-specific risk assessment take precedence.
Structure and installation history
- Check frames, welds and mounting points for cracks, distortion, corrosion and unrecorded repairs.
- Look for evidence of impact, fire, flooding, long outdoor storage or chemical exposure.
- Compare installed guards, platforms and access doors with drawings and photographs.
- Record missing fasteners, covers, sensors, lubrication lines and support steel.
- Confirm lifting points and the seller’s plan for disconnection, rigging and loading.
Motors, gearboxes and drives
- Record every motor and gearbox nameplate; confirm voltage, frequency, phase and rated current.
- Inspect mounts, couplings, belts, guards, seals and lubrication condition.
- Check for oil leakage, burnt odor, discoloration, damaged cooling fins and improvised wiring.
- Ask for oil-analysis, insulation-test or vibration records rather than relying on a quiet no-load run.
- Confirm that replacement bearings, seals, belts and gearbox parts remain available.
Electrical and controls
- Compare component labels with the electrical drawing and note undocumented changes.
- Inspect for heat damage, contamination, loose terminals and obsolete PLC or HMI hardware.
- Verify access to the PLC program, passwords, licenses and backups required for recovery.
- Check that emergency stops, door interlocks and protective devices are present; functional validation belongs in the controlled test.
- Identify components that will not match the destination plant’s supply or standards.
Machine-specific wear points
Shredders and granulators
Inspect rotor and stationary knives for chips, cracks, uneven sharpening and remaining adjustment range. Check the rotor, shafts, screen supports, screen holes, bearings and seals. Evidence of contact between rotating and fixed parts may indicate alignment or bearing problems. Measure components against original dimensions where drawings are available; appearance alone cannot establish remaining life.
Rotate only under an approved procedure and with the correct tools. Ask how the rotor is locked for knife work and how heavy screens or hoppers are lifted. For a granulator selection baseline, compare the machine with the 플라스틱 granulator 가이드.
Extruders and pelletizing systems
Screw and barrel wear can materially change output, melt stability and energy use. Request previous diameter and clearance measurements, rebuild history and the resin/filler previously processed. Check gearbox condition, heaters, thermocouples, cooling circuits, vacuum system, filtration, die plate, pelletizer and all included controls.
A brief unloaded rotation cannot demonstrate melt performance. The material trial must use an agreed feedstock and include steady-state readings for output, current, temperatures, melt pressure, vacuum and pellet quality.
Washing and drying lines
Inspect tanks, welds, screws, shafts, pumps, seals, nozzles and screens for corrosion and abrasion. Confirm which water-treatment equipment, piping, heat source and controls are included. On centrifugal dryers, check the rotor, basket or screen, bearings, access doors and vibration history. On thermal dryers, inspect fans, ducts, heaters, filters and fire-protection provisions.
A used washing line often becomes expensive because of missing balance-of-plant items. Compare the supplied modules with a complete 재활용 세척 시스템 layout and price the gaps before purchase.
Run a representative material trial
If the machine can be operated safely, test it with material representative of your intended feed—not only clean factory scrap selected by the seller. Define the batch mass, contamination, particle size, moisture and test duration in advance. The seller and buyer should agree on how samples and readings will be taken.
Record at least:
- Net acceptable output over a stable period
- Normal and peak motor current
- Temperatures, pressures, vibration and leakage relevant to the machine
- Stops, alarms, overloads and manual interventions
- Output particle size, moisture, contamination or pellet-quality result
- Time required for safe opening, screen or blade access and cleaning
Test safety functions under a controlled procedure. A seller’s statement that an interlock “worked last time” is not verification. If a live test is impossible, price the machine as an unverified asset and make inspection, repair and commissioning conditions explicit in the contract.
Build a landed-and-running cost
Do not compare only the seller’s price with a new-machine quotation. Calculate the cost to make the used machine safe, complete and productive at the destination:
- 점검, 퇴역, 청소 및 보존
- 장비 설치, 포장, 운송, 보험, 관세 및 저장
- 기초, 공공 시설, 플랫폼, 파이프 및 보호 장치
- 전기 변환, 제어 통합 및 소프트웨어 복구
- 와이어 부품, 알려진 수리 및 숨겨진 결함에 대한 예비
- 취역, 운영자 훈련 및 초기 생산 손실
- 예상 에너지, 노동 및 유지보수
사용된 기계는 여전히 더 나은 구매가 될 수 있지만, 이 사이트 특정 계산 없이는 일반적인 절감 비율이나 상환 기간은 신뢰할 수 없습니다. 협상 전에 가장 큰 수리 항목에 대한 단정한 가격을 확보하세요.
점검 결과를 보존하는 계약 조건
점검된 장비 목록, 사진 및 시리얼 번호를 구매 계약서에 첨부하세요. 포함된 액세서리, 제어 장치, 설명서 및 부품을 명시하세요. 분해 시 합의된 상태를 정의하고, 설치 후 재검토할 수 있는 손상 책임자 및 수용 기준을 정의하세요.
보증 또는 수리 의무에 대한 경우, 기간, 보장된 부품, 노동, 여행, 운송 및 기계가 합의된 시험을 거치지 못한 경우의 보완 조치를 명시하세요. 법적 조건은 관할 구역에 따라 다릅니다 따라서 거래에 대한 전문적인 상업적 및 법적 조언을 받으세요.
구매를 중단하는 이유가 되는 경고 신호
- 시리얼판, 문서 또는 소유권이 확인되지 않습니다.
- 판매자는 설명 없이 안전한 점검이나 합리적인 재료 시험을 거부합니다.
- 필수 보호 장치, 상호 차단 장치 또는 긴급 기능이 없으며, 재설치가 설계되지 않았습니다.
- PLC 접근, 독점 소프트웨어 또는 중요한 부품이 사용할 수 없습니다.
- cracks, major weld repairs, fire or water damage lack a documented engineering assessment.
- 최종 공급 범위는 사진과 설계와 일치하지 않습니다.
사용된 기계 점검 결정
결정은 확인된 상태, 목적 재료에 적합, 재설치 범위 및 도착 및 운영 비용에 기반해야 합니다. 잘 기록된 기계 장비와 사용 가능한 부품이 있으면 경험 있는 공장에서 관리할 수 있는 프로젝트일 수 있습니다. 문서화되지 않은 라인이 오래된 제어 장치와 안전한 생산 시험 없이도 저렴한 구매 가격에도 불구하고 비용이 많이 들 수 있습니다.
검사를 통해 서면으로의 결함 목록, 수리 예산 및 수용 시험을 작성하십시오. 증거가 불충분하다면, 가정으로 결함을 메우기보다는 불확실성을 비용과 위험으로 처리하십시오.
자주 묻는 질문
사용된 플라스틱 재활용 기계를 사는 가치가 있을까요?
그 상태가 문서화되고, 목표 원료에 적합하며, 수리와 통합 후에도 경쟁력이 유지되는 경우 가능합니다. 단순히 구매 가격만으로는 결정이 되지 않습니다.
What is the most important used-equipment test?
합의된 조건 하의 대표적인 재료 시험은 가장 강력한 성능 검사입니다. 넷 아웃�puta, 전류, 온도나 압력, 중지 및 필요한 출력 품질 측정치를 기록해야 합니다.
판매자가 기계를 운영할 수 없다면 어떻게 될까요?
성능과 상태는 확인되지 않음을 유의하십시오. 가능한 한 독립적인 검사를 받고, 수리 및 공사 위험을 평가하고, 계약서에 문서화, 부족한 부품 및 수용 보완 방법을 명확히 하십시오.
