Inspection includes:
PE (LDPE/HDPE), PP, PA, PET, PLA and other plastic materials
Material purity and grade
Recycled material ratio
Color, transparency and odor inspection
Purpose:
Ensure the film has good strength, appearance, and processing stability.
Test the melting flow performance of plastic materials to ensure proper processing during film production.
Inspection items:
Film thickness (Micron / Mil)
Thickness uniformity
Thickness tolerance control
Equipment:
Thickness Gauge / Micrometer
Purpose:
Prevent uneven thickness and improve bag durability.
Check for:
Black spots
Foreign particles
Bubbles
Wrinkles
Scratches
Poor transparency
Surface defects
For printed packaging bags, shopping bags, mailing bags, and custom packaging.
Testing:
Pantone color matching
Color difference control
Printing consistency
Check:
Ink bonding strength
Printing durability
Resistance to peeling and fading
Verify:
Logo position
Artwork alignment
Printing accuracy
Testing:
Film tensile strength
Bag load capacity
Elongation at break
Equipment:
Electronic Tensile Testing Machine
Purpose:
Ensure packaging bags can withstand pulling and loading forces.
Testing:
Tear strength of film
Edge tear resistance
Bag durability
Suitable for:
Heavy duty bags
Garbage bags
Industrial packaging bags
Puncture Resistance Test
Testing:
Resistance against sharp objects
Film toughness and durability
Suitable for:
Frozen food bags
Industrial bags
Heavy packaging bags
Testing:
Heat sealing strength
Seal reliability
Sealing performance
Suitable for:
Vacuum bags
Ziplock bags
Food packaging bags
Testing:
Internal pressure resistance
Bag breaking strength
Suitable for:
Liquid packaging bags
Vacuum packaging bags
Check:
Air leakage
Water leakage
Seal integrity
Suitable for:
Vacuum bags
Ziplock bags
Food packaging bags
Testing:
Moisture resistance
Water protection performance
Suitable for:
Poly mailers
Shipping bags
Moisture-proof packaging
Testing:
Film surface friction
Smoothness
Opening performance
Purpose:
Improve automatic packing efficiency.
Inspection includes:
| Item | Inspection Details |
|---|---|
| Bag Length | Size accuracy |
| Bag Width | Dimension tolerance |
| Thickness | Micron control |
| Handle Size | Carrying strength |
| Zipper Position | Closing performance |
| Sealing Edge | Sealing quality |
| Bag Shape | Appearance consistency |
Common standards:
FDA Food Contact
EU 10/2011
GB 4806
Testing items:
Heavy metals
Overall migration
Specific migration
For biodegradable and recycled packaging:
EN13432 Compostable Certification
ASTM D6400 Compostable Standard
GRS Recycled Material Certification
During production, factories monitor:
Before shipment, products are inspected according to customer requirements and AQL standards.
Final checks include:
| Equipment | Testing Purpose |
|---|---|
| Tensile Testing Machine | Tensile strength and seal strength |
| Thickness Gauge | Film thickness measurement |
| Colorimeter | Color difference testing |
| COF Tester | Film friction testing |
| Leak Tester | Sealing performance |
| Heat Seal Tester | Seal strength testing |
| Impact Tester | Impact resistance |
| Drop Test Machine | Transportation safety |
Raw Material Inspection
↓
Film Blowing Quality Control
↓
Printing Inspection
↓
Lamination Inspection
↓
Bag Making Inspection
↓
Physical Performance Testing
↓
Safety Certification Testing
↓
Final Product Inspection
↓
Packaging & Shipment
