"38 



THE INDIA RUBBER WORLD 



July 1, 1921 



Rubber Beli Dl\ k. A ^oit. plaiii-wcavc Juck ul plied yarns 

 not liner than No. 8, weight ranging from 22 to 36 ounces to 42 

 inches width. When made of tiner yarn than No. 8, it is classed 

 as special belt duck. ' 1 . J » l> ' 



B.\L.\TA Belt Duck. A closely woven fabric made of hard 

 twisted plied yarn usually made in wide widths, weight being 

 based on the square yard. 



Oil Belt Dvck. A closely woven fabric of plied yarns not 

 over No. 8, made in a variety of widths, the weight being based 

 on the square yard. 



Ni'mbered Duck. A plain woven fabric of plied yarns ranging 

 from coarse to fine numbers, weight being based on 32-inch width 

 one yard long. 



Army Duck. A fabric made in closely woven plied yarns, 

 weight being based on 285'2-inch width. 



Single Filled or Fl.\t Duck. A fabric made of single yarn, 

 plain weave, the weight being based on 30-inch width. 



Enameling Duck. A plain woven fabric with laid warp and 

 plied yarn filling, weight being based on 46;/.-inch widtli. 



PROPOSED TENTATIVE SPECIFICATIONS' FOR IMPERFECTIONS 



AND TOLERANCES FOR M-INCH 17'i-OUNCE SQUARE- WOVEN 



TIRE BUILDER FABRIC 



Serial Designation: D 21 T; Issued, 1921 



IMPERFECTIONS 

 Definition 



1. Imperfections shall be those defects in material and work- 

 manship which are in large measure capable of reduction and 

 control by supervision and which, though important, do not form 

 an essential element of the specifications. They may be classified 

 as such deviations from the qualitative characteristics of the per- 

 fect fabric as shall materially depreciate its commercial value. 



Misweaves 



2. The following imperfections are to be classified as mis- 

 weaves : mispicks. double picks, floats, broken picks and ends, 

 dropped threads, wrong draws, filling cuts, reed marks, light and 

 heavy strips, smash. 



(a) Heavy strip is a place in the fabric which contains more 

 than the specified number of picks per inch. 



(b) Thin strip is a place in the fabric which contains less than 

 the specified number of picks per inch. 



(c) Reed mark in the fabric is caused by a sprung reed in the 

 loom during weaving and appears in the fabric as though two 

 warp threads had been forced apart with the result that the next 

 threads are very close together. 



(d) Wrong draw is caused by drawing warp threads through 

 wrong harness and appears in the fabric as a streak lengthwise 

 due to the filling floating over more than one thread. 



(e) A mispick is a missing or partly missing pick and appears 

 as a streak across the width of the fabric. 



Deductions 



3. Misweaves may be sufficient cause for deductions if the 

 fabric is weakened thereby either as it is or in later processes, 

 unless the misweave is satisfactorily repaired. 



Hejections 



4. Misweaves are sufficient cause for rejection of a roll if they 

 are of such extent, importance and frequency as to require cutting 

 the fabric in four or more places per 100 yd. 



Imperfect Selvage 



5. Tight, loose, cut, weak and nicked or wavy selvage may be 

 considered imperfect selvage. 



Deductions 



6. Imperfect selvage may be cause for deductions if it is sufifi- 

 ciently imperfect to cause trouble or waste of material in 

 processing. 



Rejection 



7. Imperfect selvage may be sufficient cause for rejection if its 

 extent, frequency and importance requires cutting of the fabric 

 in four or more places per 100 yd. 



Knots 



8. No knots are allowable in the ply yarn except in colored 

 identification threads and in selvage. 



Deductions 



9. Knots in the ply yarn may be cause for deductions. An 

 allowance of one-quarter per knot is suggested. 



Rejections 



10. Knots in the ply yarn may be sufficient cause for rejection 

 if they occur in excess of 25 knots per 100 yds. of the fabric. 



'These specifications are issued under the fixed designation D — ; the final 

 number indicates the year of original issue, or in the case of revision, the 

 year of last re%ision. 



Broken Threads 



11. All broken threads should be properly repaired. 



Deductions 



12. Broken threads although repaired may be sufficient cause 

 for deductions if they cause reduction of strength below the toler- 

 ance for individual tests or cause waste of material. 



Rejections 



13. Broken threads may be sufficient cause for rejection of a 

 roll, if they are of such extent, frequency, and importance as to 

 require cutting the fabric in four or more places per 100 yd. 



Oil Spots 

 . 14. Oil spots or oily yarn should be reduced to the smallest 

 possible number and if present should be thoroughly removed. 



Deductions 



15. Oil spots or oily yarn may be cause for deduction if of 

 sufficient size to require the cutting and waste of fabric. 



Rejections 



16. Oil spots or oily yarn inay be sufficient cause for rejection 

 of a roll if they are of such extent, frequency and importance as 

 to require the cutting of the fabric in four or more places per 

 100 yd. 



TOLERANCES 

 Definition 



17. Tolerances shall be the limits within which a textile must 

 come in its specified characteristics in order that it shall con- 

 stitute a good delivery on contract. They may be classified as 

 the allowable limits of the quantitative characteristics of the fabric 

 as defined in the specifications. The following tolerances are 

 based upon the Standard General Methods for Testing Cotton 

 Fabrics (Serial Designation: D 39) of the American Society for 

 Testing Materials." 



Width 



18. (a) \o individual measurement made to determine the 

 width of the fabric shall be more than 2 per cent over or one 

 per cent under the specified average width. 



(b) The average width determined by measurements shall be 

 not more than one per cent over nor 0.5 per cent under the speci- 

 fied average width. 



Weight per Square Yard 



19. The weight of the fabric determined by test shall be not 

 more than 1.5 per cent under nor more than 3 per cent over the 

 specified weight. 



Count per Inch 



20. The count per inch determined by test shall be not more 

 than 0.2 ends over nor 0.4 ends under the specified count and not 

 more than one pick over or under for the filler. 



Bow 



21. The bow determined by test shall be not more than J4-inch 

 over or under the bow specified. 



Note. — )3cw should be ascertained by five determinations made through- 

 cut the roll commencing at least 10 j-ards from either end of roll. 



Off-square 



22. The allowable variation in the off-square of the fabric shall 

 be 3 per cent over or under the specified off-square. 



Gage 



23. (a) The individual measurements of the thickness shall 

 not vary more than 0.005-inch under or over the specified thickness. 



(b) The average thickness determined by test shall not vary 

 more than 0.002-inch under nor 0.003-inch over the specified 

 thickness. 



Tensile Strength 



24. Individual test results on warp and filling shall be not more 

 than 5 per cent below the specified tensile strength. The average 

 tensile strength of the warp and the average tensile strength of 

 the filling found by test shall be not less than the specified tensile 

 strength. 



=A.S.T.M. Standards Adopted in 1920. 



THE "BULL GRIP" THAT STICKS AND STRETCHES 



The "Bull Grip" inner tube patch equipment consists of patch- 

 ing rubber which is all gum, averaging 5/128 and 6/128-inch in 

 thickness. The cement is of the best quality, packed in J4 by 

 4-inch lead, clipped end tubes, with polished metal buffers V/2 

 inches in diameter. The manufacturer guarantees Bull Grip to 

 vulcanize better than steam, to stretch with the tube, and not to 

 deteriorate for a period of 12 months, the patch sticking and 

 holding as long as the tube lasts.— Bull Grip, Inc., Atlanta, 

 Georgia. 



