1、 The following commercial specification is adopted from the original military document. Revision A includes all known accepted revisions, amendments, notices, and Department of Defense (DoD) engineering changes previously developed for this item. Revision B and forward include changes adopted to ref
2、lect technology and design evolution. CORD, FIBROUS, ARAMID BRAIDED 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 specification covers braided aramid,
3、 intermediate modulus of elasticity coreless cord. 1.2 Classification. The coreless braided cords shall be the Types specified in TABLE I. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in Sections 3 and 4 of this specification. This section does not include
4、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, document users are cautioned that they must meet all specified requirements of the documents cited in Sections 3
5、 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 TRADE COMMISSION (FTC) 16 CFR 303 - Rules and Regulations Under the Textile Fiber Products Identificat
6、ion Act (Copies are available online at: www.ftc.gov or from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W., Washington, DC 20580-001. Electronic copies may be obtained from www.access.gpo.gov/.) PIA-C-87129D 20 December 2013 Superseding PIA-C-87129C 08 January 2009 DISTRIBUTION STATEME
7、NT: All Rights Reserved. No Part of this publication may be reproduced without prior written permission from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . PIA-C-87129D 2.3 Non-government publications. The following documents for
8、m a part of this document. AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies are available online at: www.asq.org or from the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL (ASTM
9、) ASTM D 1423 - Standard Test Method for Twist in Yarns by Direct- Counting ASTM D 1776 - Standard Practice for Conditioning and Testing Textiles ASTM D 1907 - Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method (Application for copies should be addressed to ASTM Intern
10、ational, 100 Barr Harbor Drive, West Conshohocken, PA 19426-2959. Electronic copies may be obtained from www.astm.org.) PARACHUTE INDUSTRY ASSOCIATION (PIA) PIA-TEST METHOD-4108 STRENGTH AND ELONGATION, BREAKING; TEXTILE WEBBING, TAPE AND BRAIDED ITEMS (Electronic copies may be obtained from .) 2.4
11、Order of precedence. Unless otherwise stated herein or in the contract, in the 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 spe
12、cific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 4.2). 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be
13、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 Material. The yarn used in the manufacture of the cords shall be a para-aramid, Page 2 of 9 PIA-C-87129D intermedi
14、ate modulus of the denier and twist specified in TABLE I (see 6.3). Plied yarns shall be made by twisting the specified number of ends of producers twist singles to the number of turns specified. 3.4 Construction and physical requirements. The finished braided cord shall conform to the requirements
15、specified in TABLE I, when tested as specified in 4.3.1 and 4.3.5. The cord shall be braided on braiding machines having the number of carriers specified in TABLE I for the applicable Type, and the machines shall be regulated to give a two over and two under conventional stitch, except for Type I wh
16、ich shall be 1 up and 1 down basket or diamond. 3.4.1 Carrier run-off. In the manufacture of the cord, no more than one carrier shall be allowed to be run off per length of cord specified in TABLE II for the applicable Type. When carrier ends run off, they shall be spliced a minimum distance of 5 in
17、ches to a maximum of 10 inches in length. When splicing, the outgoing carrier ends shall be joined with the new ends and hand braided for four to five picks, and the tail of the splice shall be run into the center of the braided cord. 3.5 Put-up. The length of the cord on the spools shall be as spec
18、ified by the procuring activity (see 6.2). The ends of all cords shall be securely joined and taped to the cord to prevent fraying. TABLE I Physical requirements. Cord Type Breaking strength (lb./min.) Carriers Ends/ carrier Total ends Basic yarn denier No. singles yarns for final plied yarn Yarn tw
19、ist 1/(turns/inch) Picks/ inch Length/lb. (ft. minimum) I 25 4 1 4 200 1 5.0 9 13500 II 50 8 1 8 200 1 5.0 18 6450 III 100 8 1 8 400 1 5.0 12 3240 IV 300 16 1 16 200 3 2.5 15 1080 IVa 425 16 1 16 400 2 2.5 15 825 V 500 16 1 16 1000 1 4.0 12.5 720 VI 750 16 1 16 1500 1 3.0 10.5 425 VII 1000 16 1 16 1
20、000 2 2.1 10 338 VIII 1500 16 1 16 1500 2 1.8 8 200 IX 2000 16 1 16 1500 3 1.0 6.5 135 X 4000 16 1 16 1500 6 1.0 5.5 67 XI 5000 24 1 24 1500 5 1.0 5.5 58 XII 6500 24 1 24 1500 6 1.0 4 50 XIII 200 16 1 16 400 1 5.0 14 1800 XIV 2750 16 1 16 1500 4 1.0 7 100 XV 225 12 1 12 200 3 4.0 16 1500 XVI 2/XVII
21、3/10000 16 16 256 1 22 Notes:Page 3 of 9 PIA-C-87129D 1/ Half of the carriers S twist, and the other half of the carriers Z twist 2/ Type XVI deleted. Use Type X 3/This is a 10,000 pound cord; each carrier has 16 ends braided together. TABLE II Carrier run-off. Types Distance between carrier run-off
22、s (ft. minimum) I, II, III, IV, IVa, XIII, XV 100 V, VI 50 VII 40 VIII 25 IX, XIV 20 X, XI, XII, XVII 5 3.6 Identification. Each unit pack (spool/reel) of cord interior and exterior container shall be marked per contract, or purchase order, requirements, (see 6.2). 3.7 Workmanship. The finished cord
23、 shall conform to the quality and grade of product established by this specification. The occurrence of defects shall not exceed the applicable acceptable quality levels specified herein. 3.8 Date of manufacture (see 6.2). When required by the procurement document, the textile manufacture shall prop
24、erly identify the age of the textile materials by placing 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 las
25、t manufacturing process that affects the physical characteristics of the material. 4. VERIFICATION 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: 1. First article inspection (see 4.2) 2. Conformance inspection (see 4.3). 4.2 First article in
26、spection. The first article submitted in accordance with 3.1, shall be inspected as specified in 4.3.2 through 4.3.5.1 plus TABLE V for compliance with design, construction, workmanship and dimensional requirements. 4.3 Conformance inspection. Sampling for inspection shall be performed as specified
27、in this document unless otherwise specified in the contract or order (see 6.2). Page 4 of 9 PIA-C-87129D 4.3.1 Certificates of Compliance. When Certificates of Compliance are submitted, the procuring activity reserves the right to inspect such items to determine the validity of the certification. 4.
28、3.2 Component and material inspection. In accordance with 4.1, components and materials shall be tested in accordance with all the requirements of referenced specifications, drawings, and standards unless otherwise excluded, amended, modified or qualified in this specification or applicable procurem
29、ent documents. In addition, inspection shall be performed for the requirements in TABLE III and will be accepted on a suppliers Certificate of Compliance thereto. TABLE III Component tests. Characteristics Requirement reference Commercial Test Method Material identification 3.2 1/Twist TABLE I ASTM
30、D 1423 Ply TABLE I Visual 1/Denier TABLE I ASTM D 1907 Note: 1/Suppliers Certificate of Compliance is accepted for this requirement. 4.3.3 Examination of the end item for visual defects. The defects specified in TABLE IV shall be counted regardless of their proximity to each other, except where two
31、or more defects represent a single local condition in which case only the more serious defect shall be counted. The sample unit for the examination shall be one spool/reel. Ten percent of the length contained on each sample unit, but not less than 100 feet, shall be subjected to the visual examinati
32、on. The lot size for this examination shall be expressed in units of spools/reels. Acceptance sampling shall be determined by using ANSI/ASQ Z1.4, Inspection Level III with an Acceptance Quality Limit shall be zero critical defects, 1.5 for major defects and 6.5 for total defects (major and minor co
33、mbined) per 100 units (yards). (THIS SPACE LEFT INTENTIONALLY BLANK) Page 5 of 9 PIA-C-87129D TABLE IV Visual defects. Examination Defect Classification Critical Major Minor Appearance and workmanship Any cut 01 Abrasion, chafed area or distortion in the orientation of yarns 02 Kinks, knots or uneve
34、nly braided resulting in open places, breaks in continuity of braid, or soft spots 03 Floats; broken, projecting or missing ends or picks 04 Over 1 knot per 10 linear yards in plied yarns 05 One knot per 10 linear yards in plied yarns 101 Type Other than specified 06 Color Other than specified 102 C
35、leanliness Spot or stain - clearly noticeable 1/201 Objectionable odor 2/202 Identification Omitted, incorrect, illegible, insecurely attached 203 Ticket or label not as specified 204 Handwritten entries 205 Notes: 1/ At normal inspection distance (approximately 3 feet) 2/ Normal residual odor of ch
36、emicals shall not be regarded as objectionable. 4.3.4 Examination for length and winding. The sample unit for this examination shall be one spool (reel). The inspection level shall be III and the Acceptable Quality Limit (AQL), expressed in terms of per hundred units, shall be 4.0 defects per hundre
37、d units (yards). For lots consisting of 500 or fewer units, the sample size shall be 10 and the acceptance number 1. The lot size shall be the number of spools/reels in the lot. Defects shall be as listed in 4.3.4.1 and 4.3.4.2. 4.3.4.1 Length. Defects with regard to length shall be considered to ex
38、ist if any of the following are determined during inspection: a. The length is less than specified or more than 10 percent in excess of the length specified b. Length is less than marked on ticket or label. 4.3.4.2 Winding. Defects with regard to winding shall be considered to exist if any of the fo
39、llowing are determined during inspection: Page 6 of 9 PIA-C-87129D a. Improperly or not firmly wound resulting in kinks, knots, entangling or slippage during unwinding or otherwise affecting free unhampered unwinding of cord b. Put-up not as specified c. Any end not securely joined and taped to cord
40、 to prevent fraying. 4.3.5 Testing of end item. The methods of testing specified as listed in TABLE V shall be followed. The physical values specified in Section 3 apply to the average of the determinations made on a sample unit for test purposes as specified in the applicable test methods. The samp
41、le size shall be in accordance with TABLE VI. All test reports shall contain the individual values utilized in expressing the final result. Except as otherwise specified, all testing shall be performed under standard conditions in accordance with ASTM D 1776. The sample unit for testing shall be one
42、 spool/reel of cord. The lot shall be unacceptable if one or more units fail to meet any requirements. The lot size shall be expressed in yards of cord. 4.3.5.1 Length per pound. The specimen shall be subjected to a tension load equal to 1 percent of the minimum specified breaking strength for the a
43、pplicable Type. While the specimen is under the load, a length of 10 feet shall be measured to the nearest 1/4 inch and marked off. This length shall then be cut out and weighed; and the length per pound, using the 10 foot length measurement determined under load, shall be calculated to the nearest
44、0.1 foot. TABLE V Test methods 1/. Characteristic Requirement reference Test method Determinations per sample unit Results as reported (as per sample unit) Number of carriers Picks per inch Ends per carrier Total ends TABLE I TABLE I TABLE I TABLE I Visual Visual Visual Visual 3 3 3 3 Average of 3 d
45、eterminations to nearest whole number for all characteristics Length per pound TABLE I 4.3.5.1 3 Average of 3 determinations to nearest 0.1 foot Breaking strength TABLE I PIA-STD-4108 2/, 3/1 4/Breaking strength to nearest: - 1 pound (for Types I, II, III, IV, IVa, V, VI, XIII, XV) - 5 pounds (for T
46、ypes VII, VIII, IX, X, XI, XII, XIV, XVII) Notes:1/Tests to determine compliance with specification requirements including quantity of delivery may be made under prevailing atmospheric conditions, except in settlement of dispute in which case the tests shall be made upon material which has reached e
47、quilibrium under Standard Conditions as defined in ASTM D 1776. 2/The cord shall be under a pre-tensioned load equal to 1 percent of the minimum specified breaking strength for the applicable type. 3/ The pulling clamp shall have a speed of 2 inches per minute. Page 7 of 9 PIA-C-87129D 4/ One determ
48、ination of breaking strength shall be made from each spool/reel in the sample size and reported as the breaking strength of that spool/reel. If the breaking strength of the single determination of any one spool/reel is below the specified minimum requirement for the Type of cord being tested, three
49、additional determinations shall be conducted from the same spool/reel and the average of the four determinations shall be reported as the breaking strength of that spool/reel. TABLE VI Sampling pan for end item tests. Lot size (in yards) Number of units 1 up to and including 10,500 2 10,501 up to and including 35,000 3 35,001 up to and including 105,000 5 105,001 up to and including 350,000 8 350,001 up to and including 2,240,000 13 2,240,001 up to and including 24,500,000 20 5. PACKAGIN
