Qualitätskontrolle

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Qualitätskontrollhandbuch für moderne Kunststoff-Optikspritzgussverfahren

1. Scope and Purpose

This manual specifies the quality control (QC) requirements, testing equipment, and inspection methods for the entire production process of plastic optical components (z.B., lenses, Lichtleiter) manufactured by injection molding. Its purpose is to ensure consistent optical performance, dimensional accuracy, and surface quality of final products, meeting customer and industry standards.

2. Quality Control Process & Hauptanforderungen

2.1 Pre-Production Quality Control

• Raw Material Inspection: Verify the conformity of optical plastic materials (PMMA, PC, COP, COC, etc.) with technical specifications, including purity, moisture content, melt flow rate (MFR), and optical transmittance. Reject materials with impurities or inconsistent properties.
• Mold Qualification: Inspect mold surface finish, dimensional accuracy of cavities/gates, and cooling system uniformity. Sicherstellen, dass die Oberflächenrauhigkeit der Form ≤2 nm für optische Bauteile beträgt.

2.2 Qualitätskontrolle während der Produktion

• Überwachung von Prozessparametern: Echtzeitüberwachung der Spritzgießparameter (Formtemperatur, Schmelzetemperatur, Spritzdruck/-geschwindigkeit, Halte- bzw. Nachdruckzeit, Kühlzeit) zur Vermeidung von Eigenspannungen und optischen Fehlern (z.B., Doppelbrechung, Verzug).
• Stichprobenkontrolle während des Prozesses: Regelmäßige Stichproben von Halbfertigprodukten zur Kontrolle der vorläufigen Oberflächenqualität (keine Kratzer, Blasen, oder Fließmarken) und kritische Abmessungen.

2.3 Qualitätskontrolle nach der Produktion

• Endabmessungsprüfung: Überprüfung kritischer Abmessungen (z.B., Linsenkrümmung, Dicke, Durchmesser) und geometrische Toleranz der Fertigprodukte.
• Optische Leistungsprüfung: Bewertung der wichtigsten optischen Eigenschaften zur Sicherstellung der Einhaltung der Spezifikationen.
• Oberflächenqualitätsprüfung: Umfassende Kontrolle auf Oberflächenfehler, die die optische Leistung beeinträchtigen.

3. Prüfgeräte & Inspection Methods

QC Stage
Inspection Items
Prüfgeräte
Inspection Methods & Standards
Pre-Production
Raw material transmittance, moisture content, MFR
UV-Vis spectrophotometer, moisture analyzer, melt flow index tester
• Transmittance: Test at 400–760 nm, ≥90% for PMMA/PC; • Moisture content: ≤0.02% (Karl Fischer method); • MFR: Comply with material supplier’s specs
Pre-Production
Mold surface roughness, dimensional accuracy
Atomic force microscope (AFM), coordinate measuring machine (KMG)
• Surface roughness: ≤2 nm (AFM scan); • Dimensional accuracy: ±0.001 mm (CMM measurement)
In-Production
Injection process parameters
Process monitoring system, temperature sensors, pressure transducers
Real-time data logging; deviation ≤±5% from set parameters; alarm for out-of-spec values
In-Production/Final
Surface defects (scratches, Blasen, flow marks)
High-resolution optical microscope, automated visual inspection (AVI) system
• Microscope: 50–100x magnification; • AVI: 100% inspection, defect size ≤0.01 mm rejected
Final
Dimensional accuracy (curvature, Dicke, Durchmesser)
Precision CMM, laser interferometer, thickness gauge
• Dimensional tolerance: ±0.002 mm; • Curvature: Deviation ≤0.001 mm (laser interferometry)
Final
Optical performance (transmittance, Doppelbrechung, light distribution)
UV-Vis spectrophotometer, polarimeter, goniophotometer
• Transmittance: ≥90% (400–760 nm); • Birefringence: ≤5 nm/cm; • Light distribution: Comply with design specs
Final
Coating quality (if applicable: HC/AR coating)
Abrasion tester, reflectometer
• Abrasion resistance: ≥6H pencil hardness; • Reflectance: ≤1% (AR coating)

4. Quality Assurance Measures

• Equipment Calibration: All testing equipment shall be calibrated annually by authorized institutions to ensure measurement accuracy, with calibration records retained.
• Personnel Training: QC operators must receive professional training on equipment operation, inspection standards, and defect identification, passing qualification tests before taking up posts.
• Data Traceability: Establish a complete quality record system, including raw material certificates, process parameter logs, inspection reports, and non-conforming product handling records, ensuring full traceability of each batch.
• Non-Conforming Product Handling: Non-conforming products shall be marked, isolated, and reviewed. Disposition (rework, scrap, re-inspection) shall be approved by the quality department, with preventive measures formulated to avoid recurrence.

5. Continuous Improvement

Regularly analyze quality data (defect rate, customer complaints, process stability) to identify improvement opportunities. Conduct internal audits quarterly to verify the effectiveness of this manual, es gemäß den Industriestandards aktualisieren, Kundenanforderungen, und technologische Fortschritte.
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