Quality control is key to ensuring the safety and reliability of construction waste chutes. Longkang has established a full-process quality control system from raw material to finished product. This article explains the key quality control points in detail.
- Quality Control System
Longkang quality management process:
- Raw material inspection → 2. In-process patrol inspection → 3. Finished product inspection → 4. Outgoing inspection → 5. Traceability management
- Raw Material Quality Control
- Incoming inspection
- HDPE raw material: check grade, batch number, production date
- Performance testing: melt index, density, tensile strength
- Appearance: uniform color, no impurities
- Nonconforming raw material rejected
- Auxiliary material control
- Carbon black masterbatch: content, dispersion
- Antioxidant: purity
- Sealing ring: material, dimensions
- Buckle: material strength
III. In-Process Quality Control
- Extrusion process patrol inspection
- Wall thickness measured every 2 hours
- Check outer diameter dimensions
- Observe appearance (bubbles, streaks)
- Record process parameters
- Key control points
- Wall thickness: 6 points measured per section
- Diameter: online measurement
- Length: fixed-length cutting
- Appearance: visual inspection
- Nonconforming product handling
- Marked and segregated
- Reviewed for rework or scrap
- Causes recorded
- Prevent recurrence
- Finished Product Inspection Items
- Dimensional inspection
- Outer diameter: ±2 mm
- Wall thickness: ±0.5 mm
- Length: ±5 mm
- Out-of-roundness: ≤3 mm
- Socket-and-spigot fit
- Appearance inspection
- Smooth surface, no bubbles
- No cracks, no holes
- Uniform color
- Smooth cut surface
- Performance inspection
- Sampling inspection of tensile strength
- Sampling inspection of impact strength
- Trial assembly for sealing performance
- Buckle tensile test
- Outgoing Inspection
Before each section leaves the factory:
- Check identification and labels
- Fitted with sealing rings and buckles
- End protection
- Accompanied by a certificate of conformity
- Packaged
- Traceability Management
- Batch number spray-printed on each section
- Production records archived
- Raw material batch traceable
- Outgoing records archived
- Customers can trace the production time and shift
VII. Quality Standards
Longkang products comply with:
- Enterprise standard Q/LK JZJT
- Reference GB/T 13663 (PE pipes for water supply)
- Reference JG/T 229 (Plastic pipes for buildings)
VIII. Longkang Quality Commitment
- Nonconforming products never leave the factory
- Products accompanied by a certificate of conformity
- Warranty period 1 year (5 years under normal use)
- Free replacement for quality issues
- Lifetime technical support
