Multiwall kraft paper bags are widely used for packaging cement, dry mortar, chemical powders and mineral products. By applying a polyethylene (PE) coating to the inner paper layer, manufacturers can improve moisture resistance and provide additional protection for packaged products.
1. Key Benefits of PE Laminated Inner Paper
PE lamination offers several advantages for industrial paper bags:
Improved moisture resistance: Helps reduce moisture penetration through the coated paper surface.
Better product protection: Helps protect moisture-sensitive powders from humid conditions.
Reduced direct paper contact: Creates a coated surface between the product and the inner paper layer.
Additional surface protection: Helps protect the coated paper surface during normal handling.
Flexible packaging design: Can be specified according to product requirements and bag structure.
Note: Actual performance depends on the PE coating, bag construction, seams and storage conditions. PE lamination does not make the entire bag completely waterproof.
2. Common Applications
PE laminated multiwall kraft paper bags can be considered for:
Cement and dry mortar
Tile adhesive and construction chemicals
Calcium carbonate and mineral powders
Chemical raw materials
Other moisture-sensitive dry products
The appropriate structure depends on the product’s moisture sensitivity, filling weight and transportation conditions.
3. PE Laminated Paper vs. Separate PE Liner
| Feature | PE Laminated Paper | Separate PE Liner |
|---|---|---|
| Structure | PE coating bonded to paper | Separate PE film inside the bag |
| Main purpose | Improve moisture resistance of the coated paper layer | Provide an additional inner film barrier |
| Key considerations | Coating weight and bonding quality | Film thickness, fit and sealing |
| Selection | Depends on required protection and bag design | Depends on product and packaging requirements |
For some applications, either option may be suitable. The right choice depends on the required moisture protection and overall packaging structure.
4. How to Choose the Right Specification
Before ordering PE laminated multiwall kraft paper bags, consider:
Product type: Cement, minerals, chemicals or other powders.
Filling weight: For example, 20 kg, 25 kg or 50 kg.
Paper structure: Number of layers and paper basis weight.
PE coating: Required coating specification.
Bag design: Open-mouth or valve type.
Storage conditions: Expected humidity and transportation duration.
Providing these details helps the manufacturer recommend a suitable structure for your application.
Conclusion
PE laminated inner paper is a practical option for improving the moisture resistance of multiwall kraft paper bags. It can help protect selected industrial products when the coating and complete bag structure are properly designed.
Looking for customized multiwall kraft paper bags for cement, dry mortar, minerals or chemical powders?
Contact Zhixin Packaging to discuss your bag specifications and request a quotation.
Website: https://smartpackbags.com/
Email: rain.xu@smartpackbags.com