Testing Standard:
TAPPI T460 Air Resistance of Paper (Gurley Method)
Standard Number
TAPPI T460
Standard Title
Air Resistance of Paper (Gurley Method)
Overview for TAPPI T460 Gurley Air Resistance:
TAPPI T460 Test Method measures the air resistance of paper and can help find issues such as filtering efficiency, vacuum cup usability in manufacturing, absorbency, and more. The TAPPI T460 Gurley air resistance test is a standard test method that determines the air permeability of papers, films, foils, and other materials. The test measures the time it takes for a certain volume of air to pass through a sample under a standard pressure differential.
The test is carried out using a Gurley densometer, which consists of a cylindrical chamber with a defined area and a piston that applies a specific pressure to the sample. The sample is clamped between the two chambers of the densometer, and a timer is started once the piston is released. Air is then allowed to flow through the sample, and the time it takes for a certain volume of air to pass through is recorded.
The TAPPI T460 Gurley air resistance test is widely used in the paper, packaging, and printing industries to evaluate the porosity, air permeability, and breathability of materials. The test is also useful for determining the efficiency of filters, nonwoven materials, and other products that rely on air flow. Purple Diamond Testing offers TAPPI T460 Air Resistance of Paper (Gurley Method) as part of our packaging compliance and validation services.
Rationale for TAPPI T460 Gurley Air Resistance:
Air Resistance of Paper (Gurley Method). Data is obtained by measuring the time it takes for a certain volume of air to pass through the material. Some materials require a high air resistance which will allow the use of vacuum opening or lifting devices mainly used in manufacturing and packing of corrugated boxes. With the air resistance of paper influenced by the fiber type, length, hydration, orientation, compaction, and sizing, the data obtained from this test can verify the specification set by the manufacturer. Recycled paper generally has fibers that are ½ the length of virgin paper and therefore the porosity can be affected.
Key Points:
- Determines the need for moisture barrier coatings and the sizing of paper
- Identifies possible issues with manufacturing to end use
- Utilize this test method to ensure quality control
Related Standards:
- ISO 5636-5 – Paper and Board – Determination of Air Permeance (Medium Range) – Part 5: Gurley Method
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