1、The following commercial specification is adopted from the military document. Revision A included all known accepted revisions, amendments, notices, and Department of Defense (DoD) engineering changes previously developed for this item. Revisions B and forward include changes adopted by DoD and Indu
2、stry to reflect technology and design evolution. _ WEBBING, TEXTILE, WOVEN NYLON, FOR DECELERATORS The Parachute Industry Association makes this document available for use by Industry and Government organizations that wish to apply this specification to their products. 1. SCOPE 1.1 Scope. This speci
3、fication covers six types of Class I nylon webbing (shuttleloom weaving only). 1.2 Classification. The nylon webbing shall be of the types specified in 6.1. The types shall conform to the requirements of TABLE I as applicable for the type specified. 2. APPLICABLE DOCUMENTS 2.1 General. The documents
4、 listed in this section are specified in Sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, d
5、ocument users are cautioned that they must meet all specified requirements documents cited in Section 3 and 4 of this specification, whether or not they are listed. 2.2 Government publications. 2.2.1 Government publications. The following Government publication forms a part of this document. FEDERAL
6、 TRADE COMMISSION (FTC) 16 CFR 303 - Rules And Regulations under the Textile Fiber Products Identification Act. (Copies are available online at www.ftc.gov or from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W. Washington DC 20580-0001. Electronic copies may also be obtained from www.ac
7、cess.gpo.gov/.) 2.3 Non-government publications. The following document(s) form a part of this document (see2.4). PIA-W-27657C 29 July 2015 Superseding PIA-W-27657B 04 May 2007 DISTRIBUTION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior written permission
8、 from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . Copyright Protected: Do Not Copy!PIA-W-27657C Page 2 of 12 AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes. (Copi
9、es are available online at: or from the American Society for Quality, 600 Plankinton Avenue, Milwaukee, WI 53203). ASTM INTERNATIONAL (ASTM) ASTM D276 - Standard Test Methods for Identification of Fibers in Textiles ASTM D1423 - Standard Test Method for Twist in Yarns by Direct- Counting ASTM D1776
10、 - Standard Practice for Conditioning and Testing Textiles ASTM D1777 - Standard Test Method for Thickness of Textile Materials ASTM D1907 - Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method ASTM D3774 - Standard Test Method for Width of Textile Fabric ASTM D3775 - St
11、andard Test Method for Warp (End) and Filling (Pick) Count of Woven Fabrics ASTM D3776 - Standard Test Method for Mass per Unit Area (Weight) of Fabric (Application for copies should be addressed to ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19426-2959. Electronic copies may be
12、 obtained from www.astm.org.) AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC 20 - Fiber Analysis: Qualitative (Applications for copies should be addressed to the American Association of Textile Chemists and Colorists, PO Box 12215, Research Triangle Park, NC 27709-2215. Electro
13、nic copies may be obtained from www.aatcc.org.) PARACHUTE INDUSTRY ASSOCIATION PIA-TEST METHOD-4108 - STRENGTH AND ELONGATION, BREAKING; TEXTILE WEBBING, TAPE AND BRAIDED ITEMS (Electronic copies may be obtained from .) 2.3 Order of precedence. Unless otherwise noted herein or in the contract, in th
14、e event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained Copyright Protected: Do Not Copy!PIA-W-2765
15、7C Page 3 of 12 3. REQUIREMENTS 3.1 First article. When specified (see 6.1), a sample representative of the production quality shall be submitted for first article inspection in accordance with 4.2. 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environment
16、ally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3 Materials. 3.3.1 Nylon yarn. The nylon yarn shall be a bright, high tenacity
17、, light and heat resistant nylon 6,6 and shall have a melting point of 471 F Minimum (244 C). The yarn shall not be bleached. Testing shall be as specified in 4.4.1. 3.3.1.1 Denier. The yarn used in the manufacturing of the webbing shall be of the denier and filament specified in TABLE I. 3.3.1.2 Tw
18、ist. The final ply of the warp and filling yarns shall have a minimum of 2 turns per inch. The number of single yarns specified in TABLE I shall be twisted together (plied) in one operation. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy!PIA-W-27657C Page 4 of 12 TABLE I Cons
19、truction and physical requirements. Requirement Type I Type II Type III Type IV Type V Type VI Breaking strength (lbs minimum) 2/3,000 4,000 6,000 8,700 9,000 10,000 Weight (oz/linear yard) (maximum) 0.95 1.25 1.65 2.40 2.40 2.70 Width (inches) 2/3/4 1/16 1 1/16 1 1/16 1-23/32 1/16 1 1/16 1-3/4 1/16
20、 Ends (full width) (minimum) and denier 2/105(840) or 141(1260) 145(840) or 187(1260) 224(840) or 152(1260) 324(840) or 218(1260) 224(840) or 224(1260) 250(840) or 250(1260) Binders (minimum) 2/7 9 - - - - Picks per inch (minimum) 2/22 22 16 18 17 18 Number of single yarns for final plied yarn (mini
21、mum) 2/: Warp 2(840) or 1(1260) 2(840) or 1(1260) 2 2 3(840) or 2(1260) 3(840) or 2(1260) Binder 1 1 - - - - Filling 2(840) or 1(1260) 2(840) or 1(1260) 2(840) or 1(1260) 2(840) or 1(1260) 2(840) or 1(1260) 2(840) or 1(1260) Thickness (inches) 1/.070-.095 .090-.110 .100-.120 .080-.100 .175-.195 .115
22、-.135 Note: 1/For 1260 Denier yarn constructions, reduce thickness requirements by .010 inch. 2/All individual results shall be above minimum. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy!PIA-W-27657C Page 5 of 12 3.4 Construction and physical properties. The finished webbi
23、ng shall conform to TABLE I and 3.3 through 3.10. 3.4.1 Weave. 3.4.1.1 Types I and II. The weave for Types I and II shall be a double plain weave with a single filling. Separate binder warp ends shall weave 2 up, 2 down, 1 end as 1. All other warp yarns shall weave 2 ends as 1 except that the edge w
24、arp yarns shall weave 1 end as 1 not exceeding 8 ends on 1 selvage and 9 on the other. 3.4.1.2 Types III, IV and VI. The weave for Types III, IV and VI shall be a 5 up, 1 down, 1 up, 5 down herringbone twill with 1 reversal at the center of the webbing. The weave is shown on FIGURE 1. 3.4.1.3 Type V
25、. The weave for Type V shall be a 5 up, 1 down, 1 up, 5 down, 1 up, 1 down twill. The weave is shown on FIGURE 2. 3.5 Color. The webbing shall be natural color. 3.6 Length. Unless otherwise specified by the procuring activity, each roll of webbing shall contain 90 to 110 yards. No roll shall contain
26、 more than 3 pieces, and no piece shall be less than 10 yards in length. 3.7 Identification tickets. Each roll shall have a ticket attached with not finer than 5-ply cotton string doubled to not less than 6 inches long. The tickets shall be made of paperboard not less than 0.015 inch in thickness an
27、d the color shall be manila or light in intensity to permit easy reading of printed, stamped or typed markings. The use of handwritten entries is prohibited. The ticket shall have clipped corners at the end where a reinforcing patch (with or without a metal eyelet) is firmly affixed for attaching th
28、e tying string. The ticket shall be legibly printed with water insoluble ink with the following information: Stock number Nomenclature Type, Class and specification number Width Gross yardage Number of pieces Contract number Date of manufacture (month and year) Name of contractor Name of contracting
29、 agency. When webbing is not procured directly by the Government, the above information shall appear on the container, in which case individual roll tickets are not required. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy!PIA-W-27657C Page 6 of 12 3.8 Fiber identification. Wh
30、en directed in the procurement document or purchase order, each roll of webbing shall be labeled or ticketed for fiber content in accordance with the Rules and Regulations under the Textile Fiber Products Identification Act (see 2.2.1). 3.9 Workmanship. The finished webbing shall conform to the qual
31、ity of product established by this specification. The occurrence of defects shall not exceed the applicable Acceptance Quality Limit. 3.10 Date of Manufacture (see 6.1). When required by the procurement document, the textile manufacturer shall properly identify the age of the textile materials by pl
32、acing a tag on the finished goods or label on the containers identifying the specification to which the material is manufactured, the lot number and the date of manufacture. The date of manufacture is defined as the date (month and year) of the last manufacturing process that affects the physical ch
33、aracteristics of the material. 4. VERIFICATION. 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2) b. Conformance inspection (see 4.3). 4.2 First article inspection. The first article, submitted in accordanc
34、e with 3.1, shall be inspected and tested as specified in 4.3 through 4.7 for compliance with design, construction, workmanship and dimensional requirements. 4.3 Conformance inspection. Sampling for inspection shall be performed as specified in this document unless otherwise specified in the contrac
35、t or order (see 6.1). 4.4 Inspecting conditions. In accordance with 4.1 above, components and materials shall be inspected in accordance with all the requirements of referenced documents unless otherwise excluded, amended, modified or qualified in this specification or applicable procurement documen
36、ts. 4.4.1 Component testing. In addition to the quality assurance provisions of the subsidiary specifications, component materials listed in TABLE II shall be tested for the specified characteristics in accordance with the referenced test methods. The lot size shall be expressed in pounds, and the s
37、ample unit shall be 500 yards of the nylon yarn. The lot shall be unacceptable if one or more units fail to meet any requirement specified. All test reports shall contain the individual values utilized in expressing the final result. The sample size shall be as follows: Lot size (pounds) Sample size
38、 800 or less 2 801 up to and including 22,000 3 22,001 and over 5 Copyright Protected: Do Not Copy!PIA-W-27657C Page 7 of 12 TABLE II Component Tests. Characteristic Requirement reference Test method Nylon identification 3.3.1 ASTM D276/AATCC 20 1/Denier TABLE I ASTM D1907 Tenacity 3.3.1 1/ Luster 3
39、.3.1 1/ Melting point 3.3.1 ASTM D276 1/Light resistance 3.3.1 1/ Heat resistance 3.3.1 1/ Unbleached 3.3.1 1/ Ply TABLE I Visual 2/Twist 3.3.1.2 ASTM D1423 Notes: 1/ A Certificate of Compliance shall be submitted for these requirements. 2/ One determination per sample unit and the result reported a
40、s “pass” or “fail”. 4.5 Certificates of Compliance. When Certificates of Compliance are submitted, the Government procuring activity reserves the right to inspect such items to determine the validity of the certification. 4.6 End Item Inspection. 4.6.1 Yard-by-yard examination. The webbing shall be
41、examined on both sides for the defects listed in TABLE IV. All defects found shall be counted regardless of their proximity to each other, except where two or more defects represent a single local condition, in which case only the more serious defect shall be counted. A continuous defect shall be co
42、unted as one defect for each warp-wise yard or fraction thereof in which it occurs. The lot size shall be expressed in yards. The sample unit shall be 1 yard of webbing. Acceptance sampling shall be determined using Inspection Level III with Acceptance Quality Limit (AQL) of 2.5 minor defects. No cr
43、itical defects are allowed. The number of rolls from which the sample is to be selected shall be in accordance with TABLE III. The sample yardage shall be apportioned equally among the selected rolls. TABLE III Sampling plan. Lot size in yards Sample size in rolls Acceptance number 1,300 or less 1/5
44、 0 1,301 to 3,200 7 0 3,201 to 8,000 10 0 8,001 to 22,000 15 0 22,001 to 110,000 25 0 110,001 and over 35 1 Note: 1/ If a lot contains fewer than 3 rolls, each roll in the lot shall be examined. Copyright Protected: Do Not Copy!PIA-W-27657C Page 8 of 12 TABLE IV Webbing visual defects. Defect Descri
45、ption Critical Minor Abrasion Marks Resulting in rupture of yarns, or in nap sufficient to obscure the identity of any yarn exceeding 10 percent of width or 1 inch in length 01 Broken or missing end Two or more regardless of length or a single end exceeding 6 inch in length 02 Single end under 6 inc
46、hes but exceeding 1/4 inch 201 Broken or missing pick Two or more regardless of extent Note: The filling tie-in or joining shall not be construed as a defect of any nature. 03 Coarse or light filling bar Resulting in clearly visible1/difference in stiffness or thickness of webbing and extending for
47、more than 1/4 inch in the length direction 04 Twist or distortion Webbing will not lay flat upon application of manual pressure due to twist or distortion 202 Cut, hole, or tear Any cut, hole, or tear 05 Drop-ply Clearly visible 1/on more than 2 ends within same length and extending over 9 linear in
48、ches or more 06 Clearly visible 1/, on 1 or 2 ends within same length and extending over 9 linear inches or more 203 Edges inferior Cut, frayed, torn, slack, or otherwise poorly constructed and exceeding 1/4 inch in length 07 Floats or skips Three or more, 1/2 inch or more in combined warp and filli
49、ng directions or single float or skip over more than 1 inch 08 Three or more, less than 1/2 inch in combined warp or filling directions or single float or skip over more than 1/2 inch but not exceeding 1 inch, if in warp, nor more than 1/4 inch of the width but not exceeding 1 inch, if in filling 204 Hitchback crack Clearly visible 1/ opening between adjoining picks, or
