DLA A-A-55242 A-1996 WEBBING TEXTILE POLYESTER LOW ELONGATION《聚酯低伸长纺织带状织物》.pdf

1、A-A-55242A 4 OLL505 258 I INCH-POUND 1 A- A- 5 5 242A June 10.1996 SUPERSEDING A-A-55242 October 13, 1993 COMMERCIAL IJEM DESCRIPTION WEBBING, TEXTILE; POLYESTER LOW ELONGATION The General Services Administration has authorized the use of this commercial item description in preference to MIL-W-25361

2、. 1. SCOPE. This commercial item description covers low elongation textile webbing composed of a continuous filament polyester warp and bulked nylon filling or a continuous filament polyester filling. This webbing is intended for use in aircraft safety belts and restraining harnesses. The type VI we

3、bbing is intended for use as slings for heavy rockets and rocket warheads . 2. CLASSIFICATION. The webbing shall be provided in the following types and classes: Sype: I - 3,600-pound breaking strength II - 6,000-pound breaking strength IiI - 7,000-pound breaking strength IV - 8,700-pound breaking st

4、rength V - 10,000-pound breaking strength VI - 15,000-pound breaking strength Class: 1 - Untreated 2 - Latex treated 3. SALIENT CHARACTERISTICS. The warp yarn for all types and filling yarn for types V and VI shall be either 1000, 1100 or 2600 denier (nominal) semi-dull or bright, high tenacity poly

5、ester fiber identified as polyethylene glycol terephthalate with a minimum melting point of 4720F (see Table I). The filling yarn for types I, II, III and IV shuttle webbing shall be bright, continuous filament bulked nylon and shuttleless webbing shall be high tenacity polyester. Beneficial comment

6、s, recommendations, additions, deletions, clarifications, etc. and any data which may improve this document should be sent to: Defense Personnel Support Center, Clothing and Textiles Directorate, Attn: DPSC-FNS, 2800 South 20th Street, Philadelphia, PA 1 9 145-5099. AMSC NIA FSC 8305 DISTRIBUTION ST

7、ATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-55242A I 3.1 Widths. The webbing shall be of the widths specified in Table I. 3.2 Weave 3.2.1 Type I. The weave shall be a two up,

8、two down twill with one reversal at the center of 3.2.2 Twes II, LU, IV and V (shuttle webbing). The weave shall be as shown in Figure 1 with the webbing. one reversal at the center of the webbing. The weave shall be plain weave for the shuttleless webbing and shall have a catchcord using 500 denier

9、 polyester yarn. 3.2.3 Type VI. The webbing shall be woven in a three-ply (face, middle and back) plain weave with binders weaving three up and three down. The binders pull one face, one middle, and one . back pick together. Warp ends weave two ends as one, binder and selvage ends weave single. The

10、selvages shall have eight ends on one edge and nine ends on the other. A cross section of the weave is shown in Figure 2. 3.3 Finish 3.3.1 Class 1, untreated. When class 1 is specified, the webbing shall be untreated. 3.3.2 Class 2, latex treatment. When class 2 is specified, the webbing shall be im

11、pregnated with a natural rubber latex containing the necessary curatives and antioxidants. The webbing shall be saturated by total immersion in the latex bath for a period of time sufficient to allow penetration to the core of the webbing and the excess then removed to permit conformance to the fini

12、shed weight requirement. The webbing shall be dried and vulcanized. 3.4 Physical requirements. The finished webbing shall conform to the requirements in Table I when tested as specified under end item performance testing and Table IV. 2 Provided by IHSNot for ResaleNo reproduction or networking perm

13、itted without license from IHS-,-,-A-A-55242A 9993974 0171507 O20 A-A-55242A II I I o 3 + W CJ o - o 3 + O cl s - o i + O O D rl - 3 + o 3 : 11 I ? 3 2 III ? CI rl 00 CJ 2 III ? 3 2 III v? 3 C O r 3 4 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,

14、-A-A-55242A = 7979974 OL71508 Tb7 A-A-55242A This requirement applies to the yam prior to weaving. Face, middle, and back ends. For type V, class 2, dyed webbing, the thickness range shall be .080-. 1 10 inch. The breaking strength of any individual specimen in any sample unit shall be no lower than

15、 the minimum specified. Requirements for abrasion resistance of the webbing are based on the use of hexagonal rods supplied by the Narrow Fabrics Institute, Inc. as noted in Method 5309 of FED-STD-191 - Textile Test Methods. Pertains only to class 2 latex treated webbings. Pertains to untreated and

16、to treated webbings. 3.5 Color. The color of the types I, II, III and IV finished webbing shall be natural white or shall match the standard sample for Air Force Shade Sea Green 1001, Air Force Sage Green 1565, Camouflage Green 483, or the required color as specified by the procuring activity. Types

17、 V and VI shall be Camouflage Green 483 or as specified by the procuring activity. When dyed webbing is specified, the dyed untreated webbing shall match the shade standard and the shade imparted by the treatment shall be acceptable. 3.5.1 Colorfastness. The dyed and finished webbing shall show colo

18、rfastness to light equal to or better than the standard sample or equal to or better than a rating of “good“. Colorfastness to crocking shall be equal to or better than the standard sample or shall be an AATCC chromatic transference scale rating of not lower than 3.5. Testing shall be as specified a

19、ccording to the following test methods: ASTM-G 23-88 - Colorfastness to Light; and AATCC 8-89 - Colorfastness to Crocking. 3.6 Put-up The webbing shall be put up in rolls. Unless otherwise specified, each roll of webbing shall contain 90 to 110 yards. No roll shall contain more than three pieces and

20、 no piece shall be less than 10 yards in length. 3.7 Labeyidentification tickets. Each roll of webbing shall have an identification ticket attached to the roll. 3.8 Labeytag. Each roll shall be individually bar-coded with a paper tag. The paper tag shall be standard bleached sulfate having a basis w

21、eight of 100 pounds. The paper used for the tags shall have a smooth finish to accept thermal transfer and direct printing. The tags shall have a hole and shall be attached to each roll by a fastener, clearly legible and readable by a scanner. The bar coding element shall be a 13 digit national stoc

22、k number (NSN). The bar code type shall be a medium to high code density and shall be located so that it is completely visible on the roll as specified and so that it causes no damage to the roll. 4. REGULATORY REOUIREMENTS. The offerorkontractor is encouraged to use recovered materials to the maxim

23、um extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR). 5. QUALITY ASSURANCE PROVISIONS 5.1 Certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this commercial i

24、tem description; conforms to the producers, standards, and quality assurance practices. The Government reserves the right to require proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract. 4 Provided by IHSNot for Re

25、saleNo reproduction or networking permitted without license from IHS-,-,-A-A-55242A 5.2 Market acceptance criteria. The item offered, must have been sold to the commercial market or to the Government for at least two years. 5.3 Warranty. The item offered shall include the standard warranty given to

26、the commercial market beginning with the date of delivery of the individual items. 5.4 Visual examination. The lot size shall be expressed in units of yards. The sample unit is one linear yard. 5.4.1 Defects. The webbing shall be examined for the following defects: Abrasion mark Resulting in rupture

27、 of individual yarns or bruise distortion in the orientation of thread, dimensional distortion, areas noticeable thinner than adjoining unaffected areas, or in nap sufficient to obscure the identity of the filaments in any yam. Broken or Two or more, regardless of length missing, or single, missing

28、for more than 6 inches. missing thread Broken or missing pick Two or more regardless of extend. Cut, hole or tear Any cut, hole or tear. Drop-ply Edges Fine or light filling bar Floats More than two ends within same length and extending 9 linear inches or more clearly visible at normal inspection di

29、stance (approximately 3 feet). Cut, frayed, torn, slack, regardless of length or otherwise poorly constructed and exceeding 1/4 inch in length. Any fine or light filling bar clearly visible at normal inspection distance (approximately 3 feet). Three or more measuring 1/2 inch or more in combined war

30、p and filling directions; or single, floating over more than one inch. Heavy or coarse Noticeably stiffer or thicker than adjoining unaffected webbing. filling bar, heavy place Kinks More than three in any 9 linear inches on surface of webbing clearly visible at normal inspection distance (approxima

31、tely 3 feet). Knots More than one knot in any 9 linear inches. Mispick, skips Resulting in widthwise repeated floats more (harness) than 1/4 inch long. Slack end Two or more in same length, jerked-in between picks, or loops on surface of webbing clearly visible at normal inspection distance (approxi

32、mately 3 feet). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Smash Tight pick or scalloped Weak or tender Wrong draw Width Label A-A-55242A Any smash. Resulting in rolling of webbing; (any filling, edge noticeable indentation of edge). Any weak

33、or tender spot clearly visible at spot normal inspection distance (approximately 3 feet). Extending 9 linear inches or more. Less than minus tolerances, more than plus tolerance. Label missing, incorrect, or illegible; measurement of item not as specified; bar-code omitted or not readable by scanner

34、, Human- Readable Interpretation (HRI) omitted or illegible; bar-coded type not as specified code density not as specified. . 5.5 Overall examination. Each defect listed shall be counted not more than once in each roll examined. Each roll in the sample shall be examined over its entire length. If a

35、lot contains fewer than 3 rolls, each roll in the lot shall be examined. 5.5.1 Defects. The webbing shall be examined for the following defects: Objectionable odor. Uncleanness throughout. Off shade, (not within established tolerance). Poor color penetration, cloudy, mottled or streaky throughout. P

36、oorly constructed, not firmly and tightly woven. Class 2 - Latex treatment not fully cured, tacky, uneven. 5.6 Length examination. During the overall examination, each roll in the sample shall be examined for the defects listed below. In addition, the lot shall be rejected if the total of the actual

37、 gross lengths of the rolls in the sample is less than the total of the gross lengths marked on the roll tickets. 5.6.1 Defects. The webbing shall be examined for the following defects: Gross iength of roll is more than 2 yards less than the gross length marked on the ticket. Length of roll not as s

38、pecified in put-up paragraph. Length of individual piece is less than 10 yards. More than three pieces on a roll. 5.7 End item Derformance testing. The webbing shall be tested for the characteristics listed in table IV below. The lot size shall be expressed in units of 1 linear yard. The sample unit

39、 shall be as follows: 9 yards finished webbing (class 1) 25 yards finished webbing (class 2) 1 yard dyed, untreated webbing The lot shall be unacceptable is one or more sample units fail to meet any requirement specified. For breaking strength (initial and after abrasion) the lot shall be unacceptab

40、le if any test specimen fails to meet the minimum requirement specified. For breaking strength after accelerated aging, 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-55242A 9999974 Ol17l15l1L 551 Characteristic Weave Ends total A-A-55242A th

41、e lot shall be unacceptable if the lot percent average loss in strength exceeds the maximum requirement. The sample size shall be as follows: Lot size (yards) 800 or less 2 801 up to and including 22,000 3 22,001 and over 5 Sample size (sample units) TABLE IV: End item tests. Reference . Test method

42、 No. of determinations Table I Visual 1 Table I Visual - per sample unit Weight Thickness Break strength: Picks per inch I Table1 I Visual 1 - Table I ASTM-D-3776 If 1 Table I ASTM-D- 1777 1 Table I ASTM-D-5035 5 After abrasion (class 2) After accel-erated aging (class 2) Initial I l Table I ASTM-D-

43、5309 21 & ASTM-D-5035 Table I ASTM-D-5820 zf - 31 & Elongation: ASTM-D-5035 Table I ASTM-D-5035 I At 2500 lb load: tvDe I At 3000 lb load: types II, III, IV, V, VI specified minimum breaking strength: types II, III, IV, V, VI At 90 percent of Table I ASTM-D-5035 5 Table I ASTM-D-5035 5 Results repor

44、ted as II Vearest 0.01 ounces - ndividually and average Df I 5 deter. to nearest 1.0 Individually and average of 5 deter.to nearest 1 .O lb. Aver. of 5 deter. to nearest 1.0 Ib. Then nearest 1.0 % loss from untreated, not aged results. Aver. of 5 deter to nearest 1.0 % Aver. of 5 deter. to nearest I

45、I 0.1 % I Aver. of 5 deter. to nearest 0.1% - 1/ Except that one specimen 1 linear yard in length shall be weighed. - 2/ Test methods shall be as specified in FTMS 191 - Textile Test Methods. - 3/ Except that the webbing shal1,be oven aged for 7 days at 1500F 2 2OF. 5.8 Acceptance criteria. Acceptan

46、ce criteria shall be as specified in the contract or purchase order. 6. PACKAGING 6.1 Preservation, packing, and marking. The preservation, packing, and marking shall be as specified in the contract or order. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from

47、 IHS-,-,-7. NOTES 7.1 Source of Government documents. Copies of military and Federal documents are available from: Standardization Documents Order Desk Bldg. 4D 700 Robbins Avenue Philadelphia, PA 19 1 1 1-5094 7.2 Sources of Non-government documents ASTM Test Methods - Applications for copies shoul

48、d be addressed to: American Society For Testing and Materials 100 Barr Harbor Drive West Conshohocken, PA 19428 AATCC Test Methods - Applications for copies should be addressed to: American Association of Textile Chemists and Colorists (AATCC) P. O. 12215 Triangle Park, NC 22709-2215 MILITARY INTERE

49、STS: Custodians Army - GL Air Force - 99 Review Activities Air Force - 11,82,45 CIVIL AGENCY COORDINATING ACTIVITY: GSA - FSS PREPARING ACTIVITY DLA - CT Project Number 8305-0570 , 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-55242A 74 OLL5L3 324 A-A-55242A FIGURE 1. WEAVE DIAGRAM TYPE II, III, IV AND V 9 Provided by IHSNot for ResaleNo reprod