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TAPPI T 831 om-09
- Water Absorption of Corrugating Medium: Water Drop Penetration Test
- standard by Technical Association of the Pulp and Paper Industry, 01/01/2009
- Publisher: TAPPI
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1. Scope and summary
1.1 The water absorptivity of corrugating medium is measured by dropping a drop of water on the surface ofa specimen and determining the time in seconds for the drop to penetrate through the sheet and wet the lower surface.
1.2 This method is applicable to corrugating medium as it is commercially produced by all processes. It isgenerally applicable to relatively unsized (water leaf) containerboards but may not be applicable to more highly sizedboards or to grades produced in different grammage (basis weight) than those normally used in corrugating medium.
1.3 Alternative methods which can be performed in the same general time period with equal repeatability donot give the same numerical results, but, in general, will rank the materials in the same order as this method (see Section9.2).
1.1 The water absorptivity of corrugating medium is measured by dropping a drop of water on the surface ofa specimen and determining the time in seconds for the drop to penetrate through the sheet and wet the lower surface.
1.2 This method is applicable to corrugating medium as it is commercially produced by all processes. It isgenerally applicable to relatively unsized (water leaf) containerboards but may not be applicable to more highly sizedboards or to grades produced in different grammage (basis weight) than those normally used in corrugating medium.
1.3 Alternative methods which can be performed in the same general time period with equal repeatability donot give the same numerical results, but, in general, will rank the materials in the same order as this method (see Section9.2).
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