Before mass production, plastic packaging bag manufacturers establish detailed production processes based on customer requirements, product specifications, and quality standards. Through systematic document management and process monitoring, factories ensure consistent product quality, production efficiency, and compliance with customer expectations.
Before production, the factory confirms all technical requirements with customers, including:
Product name and application
Bag type (ziplock bags, three side seal bags, mailing bags, vacuum bags, etc.)
Material requirements (PE, PP, PET, PA, PLA, recycled materials, etc.)
Size specifications
Thickness requirements (Micron / Mil)
Printing requirements
Packaging quantity
Special performance requirements (food grade, anti-static, moisture-proof, freezer safe, etc.)
All requirements are documented as a product specification sheet for production reference.
When customers provide samples, the factory analyzes and confirms:
Bag structure
Material composition
Film thickness
Bag dimensions
Sealing method
Product performance requirements
Based on the sample analysis, the factory develops a suitable production plan to ensure the final products match the customer's sample standards.
For printed packaging bags, customers need to approve the final artwork before production.
Artwork confirmation includes:
Logo position
Graphic design
Text content
Printing colors
Barcode information
Image resolution
Layout dimensions
The approved artwork becomes the official reference for plate making and printing production.
A standard sample is produced and confirmed before mass production.
The standard sample includes:
Product appearance
Dimensions and specifications
Material structure
Printing effect
Sealing performance
Packaging method
After customer approval, the standard sample becomes the quality reference for future production batches.
Before full-scale printing, a printing proof is prepared for customer confirmation.
Inspection items include:
Color accuracy
Printing position
Graphic clarity
Registration accuracy
Ink adhesion
This process helps prevent color differences, printing errors, and quality issues during mass production.
A detailed production process sheet is created according to the product requirements.
The process sheet includes:
| Item | Details |
|---|---|
| Product Name | Packaging bag model and specification |
| Raw Material | PE / PP / PET / PA, etc. |
| Film Thickness | Required thickness specification |
| Size | Length × Width dimensions |
| Printing | Number of colors and printing plate information |
| Bag Making Method | Sealing and production method |
| Production Parameters | Machine settings and production speed |
| Packaging Requirements | Quantity per carton and packing method |
| Inspection Standards | Quality control requirements |
The process sheet is distributed to the production department as the manufacturing guideline.
For printed plastic packaging bags, a plate-making order is prepared before printing.
The plate-making order includes:
Customer name
Product name
Number of printing colors
Printing size
Cylinder specifications
Text requirements
Artwork reference number
Plate material requirements
This ensures the printing department produces plates according to the approved design.
During production, the factory conducts quality monitoring at every stage.
Inspection items:
Film thickness uniformity
Film width accuracy
Transparency
Tensile strength
Film performance
Inspection items:
Color difference
Printing registration accuracy
Pattern clarity
Ink adhesion
Inspection items:
Adhesive mixing ratio
Lamination strength
Curing time
Bonding quality
Inspection items:
Bag dimensions
Cutting accuracy
Heat sealing strength
Edge quality
Overall appearance
If any problems occur during production, the factory performs:
Problem Identification → Cause Analysis → Process Adjustment → Quality Verification → Continuous Tracking
Common production issues include:
Raw material problems
Size deviation
Printing defects
Weak sealing
Appearance defects
This ensures defective products are controlled before shipment.
The factory maintains complete production records, including:
Customer requirement documents
Approved artwork files
Standard samples
Production process sheets
Plate-making documents
Inspection reports
Shipping records
This enables full traceability from raw materials to finished products.
Customer Requirement Confirmation
↓
Sample Analysis
↓
Artwork Approval
↓
Standard Sample Confirmation
↓
Printing Proof Approval
↓
Production Process Sheet Preparation
↓
Plate Making Order
↓
Raw Material Preparation
↓
Film Blowing
↓
Printing
↓
Lamination
↓
Bag Making
↓
Quality Inspection
↓
Packaging & Shipment
