Technical Specifications for Paint Bucket Molds
Chapter 1: Product Definition
Paint bucket molds are specialized equipment for manufacturing plastic paint packaging containers, belonging to the important category of hollow container molds, primarily used to produce various specifications of covered chemical packaging buckets.
Chapter 2: Structural Design Standards
2.1 Product Structure Parameters
Component | Design Standard | Technical Requirements |
|---|
Bucket Body | Wall Thickness 2.0-3.0mm | Uniformity deviation ≤10% |
Bucket Opening | Diameter 60-100mm | Thread accuracy 6g grade |
Handle | Load-bearing ≥200N | Fatigue life 5000 cycles |
Lid | Sealing pressure 0.05MPa | Opening/closing torque 3-5N·m |
2.2 Mold Technical Parameters
Basic Mold Parameters:┌─ Dimensions│ ├─ Plate size: 1500×1200mm│ ├─ Closed height: 800-1000mm│ └─ Mold weight: 3-8 tons├─ Molding System│ ├─ Number of cavities: 1×4 or 1×6│ ├─ Core-pull mechanism: Angle pin slides│ └─ Ejection method: Stripper plate ejection└─ Gating System ├─ Hot runner: Valve-gated 4-6 points └─ Cold runner: Auxiliary runner
Chapter 3: Material Selection
3.1 Main Material Types
HDPE: Density 0.95-0.96g/cm³, MFI 5-8g/10min
Copolymer PP: Density 0.90-0.91g/cm³, MFI 10-15g/10min
LLDPE: Density 0.92-0.93g/cm³, MFI 2-5g/10min
3.2 Material Performance Requirements
Performance Indicator | HDPE Standard | PP Standard | Test Method |
|---|
Tensile Strength | ≥22MPa | ≥25MPa | GB/T 1040 |
Flexural Modulus | ≥800MPa | ≥1200MPa | GB/T 9341 |
Impact Strength | ≥4kJ/m² | ≥6kJ/m² | GB/T 1843 |
Melt Flow Index | 5-8g/10min | 10-15g/10min | GB/T 3682 |
Chapter 4: Manufacturing Accuracy
4.1 Machining Accuracy Requirements
Machining Item | Accuracy Grade | Tolerance Range | Inspection Tool |
|---|
Cavity Dimensions | IT7 | ±0.02mm | CMM |
Guide Pin Holes | IT6 | ±0.01mm | Inside Micrometer |
Parting Surface | Flatness | 0.02mm/100mm | Surface Plate |
Cooling Holes | Position | ±0.5mm | Go/No-Go Gauge |
4.2 Surface Treatment Standards
Cavity surface: Texture or polish treatment
Texture depth: 0.02-0.03mm
Polish grade: A2 mirror finish
Rust prevention: Chrome plating or nitriding
Chapter 5: Molding Process
5.1 Injection Parameter Settings
Parameter Category | Setting Range | Control Accuracy |
|---|
Barrel Temperature | 190-220℃ | ±3℃ |
Mold Temperature | 40-60℃ | ±2℃ |
Injection Pressure | 80-120MPa | ±5% |
Packing Pressure | 60-90MPa | ±3% |
Cooling Time | 25-40s | ±1s |
Cycle Time | 55-85s | ±2s |
5.2 Process Control Points
Melt temperature control: Zoned heating
Injection speed control: Multi-stage setting
Packing pressure control: Decreasing curve
Cooling time optimization: Determined by wall thickness
Chapter 6: Quality Inspection
6.1 Product Inspection Items
Inspection Category | Inspection Item | Acceptable Standard | Inspection Frequency |
|---|
Dimension Inspection | Opening Diameter | ±0.2mm | Every 2 hours |
Wall Thickness Inspection | Uniformity | ±0.2mm | Every 4 hours |
Seal Inspection | Leakage Rate | ≤1%/min | Each batch |
Appearance Inspection | Surface Defects | No sink marks/flash | Each shot |
6.2 Performance Test Standards
Performance Test System:Strength Tests├─ Stacking test: 3 layers fully loaded 48h├─ Drop test: 1.0m height├─ Handle pull test: ≥200N└─ Lid torque test: 3-5N·mSeal Tests├─ Vacuum test: 0.03MPa/5min├─ Pressure test: 0.1MPa/10min└─ Cycle test: 100 open/close cyclesEnvironmental Tests├─ High/Low temperature: -20℃~60℃├─ UV exposure: 500h irradiation└─ Chemical immersion: 24h
Chapter 7: Production Efficiency
7.1 Production Cycle
Product Specification | Cavities | Cycle Time | Daily Output | Yield Rate |
|---|
1L Bucket | 1-4 | 45-55s | 9000-11000 | ≥99% |
4L Bucket | 1-2 | 55-65s | 5500-6500 | ≥98.5% |
18L Bucket | 1 | 70-85s | 2000-2400 | ≥98% |
7.2 Energy Consumption Indicators
Power consumption: 0.8-1.0 kWh/kg
Cooling water consumption: 2.0-2.5 m³/h
Compressed air: 0.3-0.5 m³/min
Hydraulic oil temperature: 40-50℃
Chapter 8: Mold Maintenance
8.1 Daily Maintenance Items
Parting surface cleaning: Each shift
Guide pillar lubrication: Daily check
Cooling water lines: Weekly check
Hot runner: Monthly calibration
8.2 Periodic Maintenance Plan
Maintenance Item | Maintenance Interval | Work Content | Acceptance Standard |
|---|
Slide System | 10,000 cycles | Clean and inspect | Smooth movement |
Ejection Mechanism | 20,000 cycles | Inspect and replace | Accurate return |
Cooling System | 30,000 cycles | Clean and test | Flow rate meets standard |
Complete Overhaul | 50,000 cycles | Accuracy restoration | Dimensions qualified |
Chapter 9: Application Requirements
9.1 Environmental Adaptability
Operating temperature: -20℃ to 60℃
Storage temperature: -30℃ to 70℃
Humidity range: 30-90% RH
Chemical environment: Resistant to common solvents
9.2 Safety Standards
Material safety: Compliant with FDA standards
Structural safety: No sharp edges
Usage safety: Clear labeling
Transport safety: Stable stacking
Technical Summary: Paint bucket molds ensure that the produced packaging containers have good sealing performance, sufficient strength, and stable performance through reasonable structural design, precise manufacturing processes, and strict quality control. Mold design must fully consider usage requirements and production processes, achieving efficient and stable production through optimized structure and parameter settings.
