In the manufacturing process of slippers, quality control is a crucial step in ensuring that products meet international standards. Whether it’s EVA slippers, PVC slippers, or slippers made of other materials, rigorous quality testing helps brands avoid after-sales issues and improve customer satisfaction.
一、Raw material warehousing inspection
The first hurdle before production is the rigorous inspection of raw materials:
- Material Composition Analysis: Ensures EVA/PVC raw material purity meets standards and is free of harmful substances.
- Physical Performance Testing: Tensile strength, elongation at break, and hardness testing.
- Environmental Certification Verification: Compliance with international standards such as REACH, RoHS, and SGS.
- Color Consistency Check: Prevents batch-to-batch color differences.
二、Injection Molding Process Monitoring
Real-time monitoring during the production process is crucial:
- Temperature Control: Injection molding temperature deviation controlled within ±5°C
- Pressure Monitoring: Ensure complete mold filling, free of missing material and air bubbles
- Cooling Time Management: Prevent deformation and uneven shrinkage
- First Article Inspection: Full-dimensional inspection of the first product after each shift’s start-up.
三、Appearance quality inspection
Appearance is the consumer’s first impression of a product and requires 100% inspection:
- Surface free of burrs, flash, and shrinkage marks.
- Logo printing clear, accurate, and with strong adhesion.
- Uniform color, free of spots, impurities, and bubbles.
- Upper and sole firmly bonded, with no risk of separation.
四、Dimensional accuracy inspection
Use professional measuring tools to sample and inspect key dimensions:
- Shoe Length: Tolerance ±3mm
- Shoe Width: Tolerance ±2mm
- Sole Thickness: Tolerance ±1mm
- Upper Height: Tolerance ±2mm
五、Physical performance testing
Laboratory sampling tests ensure product durability:
- Abrasion resistance test: DIN abrasion test, volumetric abrasion ≤150mm³
- Slip resistance: Dry/wet coefficient of friction ≥0.3
- Flexural strength test: 100,000 flexes without cracking
- Compression set: ≤35% (EVA material)
- Peel strength: Upper to sole adhesion ≥3.0N/mm
六、Finished product factory inspection
The last line of defense before shipment:
- AQL Sampling Standard: Performed according to ISO 2859-1
- Packaging Integrity Check: Verification of outer cartons, labels, and barcodes
- Quantity Count: Ensure order quantity accuracy
- Shipping Report: Provide a complete QC inspection report
Our Quality Commitment
As a professional slipper manufacturer, we implement a quality control system that exceeds industry standards:
- ✅ ISO 9001:2015 Quality Management System Certification
- ✅ BSCI Social Responsibility Audit Passed
- ✅ A quality control team with 15+ years of experience.
- ✅ The defect rate should be controlled below 0.3%.
- ✅ Quality issues will be responded to and handled within 48 hours.
Need more details on quality control or to request a test report template?
Feel free to contact our professional team; we will provide you with a complete quality management solution.
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