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D3990-12 – Standard Test Method Technical Guide
📜 Scope and Application of ASTM D3990-12
ASTM D3990 – 12 (Reapproved 2020) is a standardized terminology document specifically covering defects in both woven and knit fabrics. Approved for use by the U.S. Department of Defense, this standard provides a comprehensive lexicon designed to foster precise communication across the textile industry. It offers detailed descriptions of defects, illustrations, and a robust cross-referencing system where synonyms are listed in parentheses (e.g., chafe mark for abrasion mark).
The standard defines terms alphabetically and is structured to support a wide range of stakeholders—from production and quality control to research and development. Importantly, it was developed in accordance with the internationally recognized principles on standardization established by the World Trade Organization Technical Barriers to Trade (TBT) Committee, ensuring its global applicability in fabric quality assessment and trade.
📋 Core Defect Definitions and Synonyms
The terminology in D3990 categorizes defects stemming from yarn inconsistencies, structural construction flaws, and finishing or handling damage. The following table highlights key defects defined in the standard, directly quoting their official descriptions and associated synonyms.
| 🟦 Defect | 📏 Synonym(s) | 🎯 Description (per D3990-12) |
|---|---|---|
| Abrasion Mark | Chafe Mark | An area damaged by friction. |
| Barré | Warp Streak (contextual) | An unintentional, repetitive visual pattern of continuous bars and stripes usually parallel to the filling of woven fabric or to the courses of circular knit fabric. Barré can be caused by physical, optical, or dye differences in the yarns, or geometric differences in the fabric structure. |
| Blotch | Oil Spot | An off-colored area of any shape caused by grease or oil. |
| Bow | — | A fabric condition resulting when filling yarns or knitting courses are displaced from a line perpendicular to the selvages and form one or more arcs across the width of the fabric. |
| Broken End | — | Woven fabrics: A void in the warp direction due to yarn breakage. |
| Broken Pick | — | Woven fabrics: A discontinuity in the filling direction caused by a break or cut in the filling yarn. |
| Bruise | Pressure Mark | An area that has been subjected to impact or pressure, that differs from the adjacent normal fabric. |
💡 Technical Note on Cross-References: D3990 heavily utilizes cross-references to standardize language. For example, “baggy cloth” directs the user to wavy cloth, and “box mark” refers to shuttle mark. Using the precise primary term is essential for consistent quality reporting and defect analysis across the supply chain.
⚙️ Referenced Standards and Evaluation Guidance
Accurate defect identification according to D3990 is best performed under controlled conditions. The standard explicitly references ASTM D1776, the Practice for Conditioning and Testing Textiles. This ensures that evaluations for bow, skew, barré, or contamination (like blotches) are conducted under the proper temperature and humidity levels, allowing for reproducible results.
Understanding the hierarchical structure of the terminology is crucial. Defects such as barré are distinguished from warp streaks and mixed filling based on their specific root causes, which may involve physical, optical, or dye differences in the constituent yarns.
⚠️ Common Misidentification of Edge Defects: Operators must differentiate between a clip mark and a pin mark. D3990 defines a clip mark as a visual deformation near the fabric edge caused by pressure from a clasping device on a clip tenter frame. Accurate identification is vital for troubleshooting the specific finishing process causing the defect.
❓ Frequently Asked Questions
🔍 What types of fabrics are covered under the scope of D3990-12?
Per Section 1.1, this terminology covers defects in both woven and knit fabrics, providing descriptions and illustrations for the most frequently used defect terms in these categories.
💡 What is the difference between a “broken end” and a “broken pick”?
A broken end refers to a void in the warp (lengthwise) direction of a woven fabric due to yarn breakage. A broken pick refers to a discontinuity in the filling (widthwise) direction caused by a break or cut in the filling yarn.
⚡ How does D3990 define the defect “barré”?
Barré is defined as an unintentional, repetitive visual pattern of continuous bars and stripes usually parallel to the filling (woven) or courses (circular knit). It can be caused by physical, optical, or dye differences in yarns, or geometric differences in fabric structure.
📌 Which specific ASTM standard is referenced in D3990 for the conditioning of textiles?
Section 2.1 of D3990 references ASTM D1776 (Practice for Conditioning and Testing Textiles) to ensure that fabric inspections and evaluations are conducted under standardized atmospheric conditions.