The liner is an important accessory of the ton bag, used to enhance its protective performance. This article will detail the functions, types, and selection methods of liners.
What is a Ton Bag Liner?
A liner (Liner) is a bag-shaped container placed inside the ton bag, used to hold materials and provide additional protective functions.
Main Functions of Liners
1. Moisture and Water Proofing
Function
Description
Block moisture
Prevent material from getting damp
Prevent leakage
Avoid liquid leakage
Keep dry
Maintain material quality
2. Dust and Stain Prevention
Function
Description
Block dust
Prevent dust contamination of materials
Keep clean
Material unaffected by external pollution
Hygiene guarantee
Meet hygiene requirements
3. Leak Prevention
Function
Description
Fine powder leak prevention
Prevent powder material leakage
Liquid leak prevention
Hold liquid materials
Odor barrier
Prevent odor diffusion
4. Protecting the Ton Bag
Function
Description
Isolate materials
Prevent material corrosion of the bag
Extend lifespan
Reduce bag wear
Easy cleaning
Liner is replaceable
Types of Liners
Classified by Material
Type
Material
Characteristics
Application Scenario
PE Liner
Polyethylene
Moisture/water proof, low cost
General purpose
PP Liner
Polypropylene
High strength, heat resistant
High-temperature materials
Aluminum Foil Liner
Aluminum foil composite
Good barrier properties
Special materials
Conductive Liner
Conductive material
Anti-static
Flammable materials
Classified by Thickness
Thickness
Characteristics
Application Scenario
Thin (30-50μm)
Low cost
General moisture proofing
Medium (50-80μm)
Balanced performance
General purpose
Thick (80-150μm)
High strength
Heavy load, leak prevention
Classified by Structure
Type
Description
Characteristics
Flat Bag
Simple bag shape
Low cost
M-shaped Bag
Side folding
Large capacity
Square Bottom Bag
Square bottom
Good stability
Classified by Installation Method
Type
Description
Pros & Cons
Loose-fit
Liner placed independently
Easy installation, may shift
Bonded
Liner bonded to outer bag
Secure fixation, higher cost
Integrated
Liner and outer bag integrated
Most secure, non-replaceable
Liner Specifications
Size Specifications
Ton Bag Spec
Liner Size (Reference)
500kg
90×90×90cm
1000kg
95×95×110cm
1500kg
100×100×120cm
2000kg
105×105×140cm
Note: Liner size should be slightly larger than the inner dimensions of the ton bag to ensure full expansion.
Thickness Selection
Material Type
Recommended Thickness
Granular materials
30-50μm
Powder materials
50-80μm
Fine powder materials
80-100μm
Liquid materials
100-150μm
How to Select a Liner?
Based on Material Characteristics
Material Characteristic
Recommended Liner
Susceptible to moisture
PE Liner
Powder prone to leakage
Thick PE Liner
Has odor
Aluminum Foil Liner
Flammable/explosive
Conductive Liner
Food grade
Food-grade PE Liner
Based on Protection Requirements
Protection Requirement
Recommended Solution
Moisture proofing
PE Liner
Leak prevention
Thick liner + Sealing
Anti-static
Conductive Liner
Odor barrier
Aluminum Foil Liner
Based on Usage Method
Usage Method
Recommended Type
Single use
Loose-fit
Multiple uses
Bonded or Integrated
Requires replacement
Loose-fit
Liner Installation Methods
Loose-fit Installation
Place the liner inside the ton bag
Expand the liner to fit the inner wall of the ton bag
Turn the liner opening out through the ton bag filling port
Tighten the liner opening after filling
Bonded Installation
The liner is already bonded to the ton bag at the factory
Use directly
No extra installation steps required
Integrated Type
Liner and ton bag produced as one piece
Use directly
Best performance
Quality Requirements for Liners
Appearance Requirements
Item
Requirement
Color
Uniform and consistent
Transparency
Meet specifications
Bubbles
No obvious bubbles
Impurities
No visible impurities
Physical Properties
Item
Requirement
Thickness deviation
Within ±10%
Tensile strength
≥15MPa
Elongation at break
≥200%
Dart drop impact
No rupture
Hygiene Requirements (Food Grade)
Item
Requirement
Sensory indicators
No odor
Evaporation residue
Meet standards
Heavy metals
Meet standards
Color transfer test
Negative
Cost Analysis of Liners
Cost Composition
Type
Relative Cost
PE Thin
Baseline
PE Medium
+30%
PE Thick
+60%
Aluminum Foil Liner
+100%
Conductive Liner
+150%
Cost-Benefit Analysis
Benefits of using liners:
Protect Materials: Reduce material loss
Extend Ton Bag Lifespan: Reduce ton bag replacement
Improve Safety: Prevent leakage accidents
Meet Special Requirements: Moisture proofing, anti-static, etc.
Frequently Asked Questions (FAQs)
Q: Do all ton bags need liners?
A: Not necessarily. If the material does not require special protection and the ton bag itself meets the requirements, a liner can be omitted.
Q: Can liners be reused?
A: Generally not recommended. Liners have low costs, and replacing them with new ones is safer and more hygienic.
Q: Do conductive ton bags need conductive liners?
A: Yes. Using a conductive liner with a conductive ton bag ensures overall anti-static effectiveness.
Q: How to seal the liner?
A: You can use ties, heat sealing, or specialized sealing clips. Heat sealing is recommended for liquid materials.
Conclusion
The liner is an important accessory of the ton bag. Correctly selecting and using liners can effectively protect materials, extend the ton bag’s lifespan, and improve safety. Choose the appropriate liner type and specification based on material characteristics and protection requirements.
If you need liner products or technical support, please feel free to contact us!
