Schopper folding machine for paper
This article introduces Schopper fold testers, essential tools for evaluating paper and cardboard durability through repetitive folding. By simulating real-world stress, these devices help predict material lifespan in applications like packaging, printing, and corrugated boxes.
Applicable Standards
The tester adheres to international benchmarks:
TAPPI: T 511 om-18 (Folding Endurance)
ISO: ISO 5626 (Folding Resistance)
GB/T: GB/T 457-2008 (Paper/board)
Main Parameters
| Parameter | Specification |
|---|---|
| Fold Angle | 135° (Standard), Adjustable |
| Speed | 175±10 rpm (Reciprocating) |
| Max Cycles | 0-9999 (Digital Display) |
| Sample Size | 15mm x 140mm (Standard) |
| Load Type | Spring-loaded Clamps |
Working Principle
The tester uses a rotary blade to repeatedly fold a sample at a fixed angle. Sensors count cycles until the sample ruptures, with results displayed as double folds (MIT method) or single folds (Schopper method).
Test Principle
Sample Prep: Cut a 15mm wide strip, ensuring no creases.
Mode Selection: Choose MIT (double folds) or Schopper (single folds).
Cycle Execution: Run the test until failure, recording total cycles.
Applications
Used in paper mills and packaging labs, the tester ensures materials meet strength requirements for books, food cartons, and shipping boxes. Compliance with TAPPI/ISO standards ensures reliable data for process optimization and quality control.
This guide equips users with technical insights to select and operate Schopper fold testers, ensuring accurate assessment of material fatigue resistance.