Comprehensive Guide & Technical Breakdown
Corrugated cardboard liners are primarily made from two types of paper: Kraftliner and Testliner.
### 1. Kraftliner (Virgin Wood Fibers):
- Composition: At least 80% virgin wood pulp fibers manufactured using the chemical sulfate process.
- Performance: Exceptionally long fibers create high burst strength, excellent puncture resistance, and natural moisture resistance.
- Best for: Cold storage, humid transport climates, heavy shipping cartons, and export freight.
- Composition: 100% recycled paper and cardboard fibers, typically layered with a refined surface for printability.
- Performance: Shorter recycled fibers provide slightly lower burst strength than kraftliner, but excel in eco-credentials and affordability.
- Best for: Domestic e-commerce shipping, standard mailer boxes, and dry ambient retail transport.
### 2. Testliner (Recycled Paper Fibers):
### Summary Recommendation:
Use Kraftliner outer liners when boxes need to survive rough courier sorting or cold-chain logistics; use Testliner for sustainable, budget-friendly everyday shipping.