ISO 11093-3:1994

Overview

ISO 11093-3:1994 is an international standard developed by ISO that outlines the oven drying method for determining the moisture content of wound paper and board cores. This method is essential for accurately assessing the water content in paper and board cores at the time samples are taken, contributing to quality control and consistency in the paper, board, and packaging industries. The standard is part of the ISO 11093 series focusing on testing cores, with this third part dedicated specifically to moisture content determination.

Key Topics

• Moisture Content Measurement: Provides standardized procedures to quantify the moisture content in paper and board cores, ensuring that water is the primary volatile component measured during oven drying.
• Sampling and Weighing: Details the processes for sample selection in accordance with ISO 11093-1, as well as weighing protocols before and after oven drying to ensure accurate data.
• Oven Drying Method: Specifies using an oven maintained at 105°C (±2°C) to dry test pieces, with repeated weighing until a constant mass is achieved to eliminate moisture loss or gain.
• Test Equipment Requirements:
  • Analytical balances with high accuracy
  • Water vapor-proof containers
  • Controlled-temperature ovens
• Result Calculation and Reporting: Defines the formula to express moisture content as a percentage by mass and outlines mandatory elements for comprehensive test reporting.

Applications

• Quality Control in Manufacturing: Used by paper mills, packaging manufacturers, and converters to verify that cores meet specified moisture criteria, which are critical for subsequent processing and end-use performance.
• Product Consistency: Ensures uniformity in paper and board core properties, directly impacting dimensional stability, mechanical strength, and suitability for various applications such as spooling and winding.
• Process Optimization: Helps manufacturers adjust processing parameters by providing accurate, repeatable measurements of core moisture levels, thereby minimizing defects related to improper moisture content.
• Compliance and Certification: Facilitates compliance with international quality standards, supporting product certification and trade in global markets.

Related Standards

• ISO 11093-1:1994 - Sampling methods for cores, foundational for consistent moisture content testing.
• ISO 11093-2 - Guidelines on conditioning test samples to achieve reliable measurements.
• Other ISO 11093 Parts - Standards addressing additional core properties, including dimensional measurements, flat crush resistance, and dynamic testing.

Practical Value

Adopting ISO 11093-3:1994 ensures reliable, repeatable, and standardized determination of moisture content in cores made from paper and board, which is pivotal for maintaining high product quality and performance. Its clear procedures help industries avoid quality issues arising from incorrect core moisture, such as core deformation, paper sticking, or mechanical failures during converting processes. Integrating this standard into quality control protocols supports traceability, certifiable results, and greater confidence for producers, suppliers, and end-users in the paper and packaging supply chain.

Keywords: ISO 11093-3, oven drying method, paper core moisture content, board cores, quality control, paper industry standards, testing of cores, moisture determination, international standard, packaging.