Woven and non-woven materials can be made from many different types of fiber materials including cotton, nylon, polyester, and wool. Fabric materials are often combined to create hybrid textiles with multiple characteristics. These hybrid materials must be tested to ensure both quality, as well as manufacturability. As with most textile testing, this method must be performed on a CRE machine, usually at 12 inches per minute. Other speeds can be used to simulate different real world scenarios.
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More D Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of fabric of the type in question. Test specimens then should be randomly assigned in equal numbers to each laboratory for testing.
The average results from the two laboratories should be compared using the appropriate statistical analysis and an acceptable probability level chosen by the two parties before testing is begun.
If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.
In spite of the empirical nature of the reported values, the values are considered to reflect comparative performance of similar fabrics tested and measured in the same way. No known procedure is available that can be used with all fabrics to determine the minimum tearing strength.
The highest peaks appear to reflect the strength of the yarn components, fiber bonds, or fiber interlocks, individually or in combination, needed to stop a tear in a fabric of the same construction. The valleys recorded between the peaks have no specific significance. The minimum tearing force, however, is indicated to be above the lowest valleys.
Some modification of clamping techniques may be necessary for a given fabric due to its structure. Strong fabrics or fabrics made from glass fibers usually require special adaptation to prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. It is recognized that some constant-rate-of-traverse-type CRT tensile testing machines continue to be used. Consequently, these test instruments may be used when agreed upon between the purchaser and the supplier.
Scope 1. As a consequence, these test instruments may be used when agreed upon between the purchaser and the supplier. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.
Instructions are provided for testing specimens with or without wetting. The reported value obtained is not directly related to the force required to initiate or start a tear. The inch-pound units may be approximate. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
More D Two types of asphalt-saturated felts are presented: type I - commonly called No. In the process of manufacture a single thickness of dry felt shall be saturated with an asphaltic saturant. The methods for the determination of openness of the perforations in saturated felts are presented in detail.