AIR FORCE MIL-C-83242-1969 CORD AROMATIC POLYAMIDE NONMELTING《不熔融芳香族聚酰胺软线》.pdf

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1、MLL-G83242 (USAI?) 27 October 1969 MILITARY SPECIFICATION CORD, AROMATIC POLY. ,Preparation for Delivery of STANDARDS Federal FED-STD- 19 1 Textile Test Methods Military MIL- STD- 105 Sampling Procedures and Tables for Inspection by Attributes (Copies of specifications, standards, drawings, and publ

2、ications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as di-rected by the contracLing officer.) r “, P -Y 4020 THIS DOCUMENT CONTAINS /3 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without li

3、cense from IHS-,-,-MIL-C-83242 (USAJ?) 3. REQU IKEMENTS 3.1 Goverment or supplier purchases. The requirements specified in 3.11 and 3.12 apply only to cord purchased directly by the Government. All other requirements apply to cord purchased by a supplier as a component for an end item and to cord pu

4、rchased directly by the Government. 3.2 Standard sample. The cord shall match the standard sample for shade and shall be equal to or better than the standard sample with respect to all characteristics for which t1.e standard sample is referenced (see 6.3). 3.3 Materials. The yarn used in the manufac

5、ture of the cord shall be a nomelting, aromatic polyamide, The yarn shall not carbonize at a temperature below 800F. The plied yarns shall be twisted only from the deniers specified in table I. 3 .LC Processing of yarns 3.4.1 Stretching. The yarns used to manufacture the cord shall not be subjected

6、to a stretching operation (see 4.2.2). 3.5 Bleaching. The yarn or the fabricated cord shall not be subjected to any type of bleaching process 3.6 Construction and physical requirements. The fabricated cord shall conform to the applicable requirements specified in tables I and II and following paragr

7、aphs for the respective types when tested as specified in 4.2.1 and 4.2.6. 3.6.1 Lapping o F core ends. Lapping of core ends is permissible providing the overlapsarenore than five inches but do not exceed ten inches in length (see 4.2.2). Splicing or knotting of core lines is not permissible (see 6.

8、4). The mnimum distance between a core end overlap or any adjacent core end shall be 500 feet. The approximate center of each overlap shall be marked by iqserting a bright red thread through the sleeve. The free ends of the mafker shall extend approximately three inches on either side of the sleeve,

9、 The removal of the marker shall be accomplished by a light pull on either end. When colored cord is specified, (see 3.8), the color of the marker shall be white. NOTE: The core cnd marker shall not be removed until the cord is used in the manufactured end item. 2 Provided by IHSNot for ResaleNo rep

10、roduction or networking permitted without license from IHS-,-,-C c H( r b U O m rl hl m m 0r.m e4 O I kI I aloa url a -rd 34 OUG PIrlk k m .rl om b O U rl MIL-C- 83242 (USAF) P Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIZ-C-83242 (USAI?) 3.6.1

11、.1 Protruding core ends. Mhen any core end projects through the sleeve as a result of overlapping (see 3.6.1 and 6.4) the end(s) shall be cut flush with the surrace of the sleeve with the cord in a relaxed condition. CAUTION. Do not hot knife the end (S) and be extremely careful not to damage the sl

12、eeve. 3.6.2 Extractable matter (chloroform-soluble material). No material shall be added for the purpose of weighting the cord. Thech1orofox-m- soluble material of the cord shall not exceeJ 2.0 percent when tested as specifie.d in 4.2.6. 3.7 Resistance to light and heat. The nylon cord shall lose no

13、 more than 15 percent of its original breaking srrength after exposure to light and heat when tested as specified in 4.2.6. 3.8 Color. Unless otherwise specified (see 6.2), the color of the cord shall be natural. When colored cord is specified, the color shall be obtained by yarn dyeing, and the cor

14、d shall match an approved standard shade. 3.8.1 Color matching. When dyed cord is specified, the shade of the cord shall match the standard sample under natural (north sky) daylight or artifical daylight having a color temperature of 7500 Kelvin and shall be a good approximation to the standard samp

15、le under incandescent lamplight at 2800 Kelvin (see 6.3). 3.9 Type identification. Type II cord shall be identified by one international orange colored yarn braided into the sleeve (or cover). 3.10 Ax. The yarn used to fabricate the cord shall be no more than two years old. The cord shall be no more

16、 than one year of age from the date of manufacture to the date of delivery to the first receiving point. 3.11 Put-up. Unless othenLse specified (see 6.2), the cord shall be put-up without knots in continuous lengths on spools (reels), as specified in the contract or order and in accordance with the

17、lengths specified in table III. Each spool (reel) of cord shall be so wound that each turn and layer is free from entanglement. A plus tolerance of 10 percent shall be allowed on the length of any spool (reel) specified. The ends of the cord shall be heat sealed to prevent fraying. Eighty percent of

18、 the total number of spools (reels) in the lot shall be of continuous length. The remaining twenty percent oi the number of spools (reels) in the lot may contain pieced lengths (lapped on ends). These spools (reels) sha11 contain no mure than two pieces with no piece less than 300 feet in lcngth. Wh

19、en pieced lengths are contained on a spool (reel) tile lengths of the pieces on the spool shall be marked on the identification ticket or label as specified in 3.12. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table III. Length . I I TYPe Lengt

20、h on spool (reel), feet (minimum) Type I 1500 I Type II 2100 or 1200 i Type III 2100 or 1200 3.12 Identification Each spool (reel). of cord shall have a ticket (identification tag) or label attached to it for identification purposes. The ticket shall conform to the requirements for type B, class 1,

21、size 4 or 5 of UU-T-81. The ticket shall be made of not less than 15-point paper stock and shall have a minimum tearing resistance of both directions (total) of 850 grams when tested as specified in UU-T-81. When labels are used, the 1abe.l shall be attached in such a manner as to remain in place an

22、d be clearly legible until all cord has been removed. The ticket or label shall be legibly printed, stamped or typed with water insoluble ink. The ticket or label shall contain the following information: 3.13 Workmanship. and grade of produc of defects shall no Stock Number Nomenclature Specificatio

23、n Number Length Color Contract number and date Date of manufacture (month and year) Length of pieces of cord per spool (when applicable) Suppliers name The fabricated cord shall conform to the quality t established by this specification. The occurrence t exceed the applicable acceptable quality leve

24、ls. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplie

25、r may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. Tllc Goverruncnt reserves the rigllt to perft7rm any of the inspections set forLh i.n the :;pcbcification where such inspections are deemed nc

26、ccssary to assure supplies and services conform to prescribed rcquirements. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-83242 40 m 7777706 0111172 8 . - MIL-C-83242 (USm) 4.1.1 Certificate of compliance. Where certificates of compliance a

27、re submitted, the Government reserves the right to check test such items to determine the validity of the certification. 4.2 Inspection. Sampling for inspection shall be performed in accordance with MIL-STD-105, except where otherwise indicated here- inaf ter. 4.2.1 Component and material inspection

28、. In accordance with 4.1 above, components and materials shall be tested in accordance with all requirements of referenced specifications, drawings, and standards unless otherwise excluded, amended, modified or qualified in the specification or applicable purchase documents. In addition, inspection

29、shall be performed for the requirements in table IV. Tat Characteristic Material Denier Melting point Bleaching Age of yarn and cord Twist, single yarns Twist, plied yarns ? IV. Component tests Paragraph reference 3.3 3.3 3.3 3.5 3.10 Table 1 Table I Test Method 1534 L/ 2/ - 1/ Unless otherwise spec

30、ified, a suppliers certificate of compliance is required and will be accepted for the requirements. 2/ Refers to test method of Fed Std 191. 1 B-7ist of yarns: The number of specimens averaged for the result shall be 5 determinations on the core yarns and 10 determinations on the sleeve yarns, and t

31、he deadweight tension applied to the specimens shall be 60 2 2.0 grams. The 10 deteminations of the sleeve yarns twist shall be made on specimens so selected that observations shall be made on 5 yarns braiding in one direction, and 5 yarns braiding in the opposite direction. Ttlrns per inch of the s

32、ingle yarns (spin twist) shall be determinecl from the same specirncn used for the determination of ply t.wist by cutting out all but onesingle, yarn,leaving the pli.ed ends still fastened in the clamps, and calculating on the basis of the elongated gage length which has resulted from the relief of

33、the plied twist contraction. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-83242 (USAF) 4.2.2 In-process inspection. Inspection shall be made at any point or during any phase of the manufacturing process to determine that the requirements f

34、or processing of the core and sleeve yarns for shrinkage and stretching (see 3.4.1, 3.4.2: and 3.4.3) and no more than 20 percent of the total number of spools (reels) in the lot contain pieced lengths of cord (see 3.121 have been adhered to in the manufacture of the cord. Unless otherwise specified

35、, a supplie2s certificate of Compliance thereto shall be furnished and will be accepted for the requirements. The Government reserves the right to exclude from consideration for acceptance any material or service for which in-process inspection has indicated non-conformance. 4.2.3 Examination of the

36、 end- item for visual defects. The defects specified in table V shall be countd, 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. The sample unit for the examination shall be

37、 one spool (reel). Ten percent of the length contained on each sample unLt, but not less than 100 feet, shall be subjected to the visual examina- tion. The lot size for this examination shall be expressed in units of spools (reels) each. The- acceptable quality level shall be 1.5 major defects and 6

38、.5 total defects (major and minor combined) per 100 units. Any critical defect found during sampling inspection shall be cause for rejection of the lot represented by the sample. The inspection level shall be level III. In regard to the critical defect class, inspection lot sizes of 150 or less shal

39、l be inspected IC0 percent. For inspection lot sizes of 151 to 3,200, use a sample of 150 units. For inspection lot sizes greater than 3,200 use the sample size for level III, as indicated in MIL-STD-105. At its discretion, the Government may verify the result of the suppliers examination by 100 per

40、cent examination or by sampling inspection. Any critical defect found during sampling inspection shall be cause for rejection of the lot represented by the sample. Examine Appearance and workmanship Table V. Visua.1 examinatio Defect . Cut or hole, any Abrasion, chafed area or distortion in the orie

41、ntation of yarn Kink, or unevenly braided resulting in open place, break in continuity of braid or soft spot 7 - defects Classific Cri tical Ma j or X X tion qinor 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t Type Put-up Cleanness Identificati

42、on Heavy, thick, or hard places, or uneven picks kats in plied yarn (per 10 linear yards) Light place, pull down, step marks: or uneven picks Light place . Visual examination - defec Defect Float, broken (r missing end or pick Any projecting core end Missing core end Type identification missing Manu

43、facturer S dent ification (when applicable) missing Other than specified Other than specified Spot or stain clearly Objectionable odor Omitted Information incorrect, Ticket or label not as visible 11 illegible specified Over 10 percent increase over maximum in picks per inch or over 2 inches of incr

44、eased picks per inch 10 percent increase over maximum in picks per inch for up to 2 inches ker 1 knot in sleeve yarns 4ny knot or splice in core L knot in sleeve yarns . %er 10 percent decrease under minimum in picks per inch or over 2 inches of decreased picks per inch o percent decrease under mini

45、mum in pick per inch . t! T Cl.as! Zritica: “ X X X X X X 8 Eicnti VIa j or X X X X X X o 1- c “ I 1 Minor X X X X X X x Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-83242 (UShall be used. The exposure time shall be 50 hours. The spray heads

46、 shall be shut off during the entire exposure period and the relative humidity in the test chamber during the exposure shall be 55 t 5 percent. At the end of tge exposure period, the specimens shall be conditioned at 70 + 2 F(21+10C) and 65 + 2 percent relative humidity for 24 hou -s. The specimens

47、shall then be-tested for breaking strength in accordar,ce with Method 4102 of FED STD 191, and the percent of breaking strength (B.S.) lost shall be calculated as follows : Percent of B.S. lost = Original B.S. - B.S. after exposure X 100 Original B. S. One determination shall be made per individual

48、sample unit. 4.2.6.4 Determination of resistance to heat. Five test specimens shall be taken from each sample unit. The test specimens shall be suspended in a circulating air oven at a temperature of 18O0 + 3OC (356 +, 5OF) for 1 hour. After removal from the oven, the spcimen shall be conditioned at

49、 70 + 2F and 65 2 2 percent relative humidity for 24 hours. The specimens-shall then be tested for breaking strength in accordance with Method 4102 of FED STD 191, and the percent breaking strength lost shall be calculated as specified in 4.2 .G.3. One deCemina tion shall be made per individual sample unit. - Provided by IHSNot for ResaleNo reproduction or networking p