AOPA Pilot Magazine - March 1958 - (Page 57) moisturn tends to increase bride atrmgkh and weight of undoped f&r.k The strength of fabric dried o& by impropm storage may aometimw be reahred by leaving it in a p h where t humidity is sufficient. h Dope? on the other b d , doesn't give a hoot about moisture? but i8 extremely sensitive t changes i t e m p ~ a h w e . ~ a n Gold makes it britkle and hard Xeat makes it a d t and ductile. Skudies conduck& br the CAA T ~ h i c d Devdopment and Evaluation h h r at Indiana~&, h d * ?have proved that gwd fabric covered with brittle dope will show s u c W v e fdure-'%tst by cracking of the dope, and finally by breding of the fabric." To complicute the testing problem mare, the study ahow6 that the combination of plastic and M e ~ doped I I fabric does not permit a ~ p l addie tion of the valne~of the propertha of the aepaxatx mahiah. Dopa and fabric act -h te M give the &in ib rewired mrvim a~~ One of the d n reasom for doping b t put a prohcthe seal over the cloth? a era of New York City?poinb out that ECSTASY in ETCHING The exciting new ADVENTURE IN ADVERTISING . your product, building or frudernark, pemanently etched .. . a n everendurin~ vinyl .. . "If it will PHOTQGRAPI-L ; will t PERMA ETCH" - atem from them facts: I Tempmature and humidity condi. tiens affecting fabric atrengkh are not controlled. One of the moat p p u h field testma 2, The test m y not be @ o d i i s the Seybth tesbr which ahow the n a way ka p m d w the ma& accurate r! e- amount of re&tance a doped fabric tion against a m a puncher. As sulb & which the w r h-capable, When t o or more fldd bt.~the the punch e w on n the fabric, r & e~ =me fabric show &Ear& remlta, here of t ?thmads causes a pist~nin the the are some of the t h i m which rn h btmr i~ be pushed up. The dkkr~ce responsible: pktm is q m e d increaaea with the Even a *pie fxsting drmice c d l s f ~ r fabric sken&. a s&hd testing In the W m h i w n officm of the CAA, there i~ a tension-ty~eWd h t e r which r e quires that a earn& be cut from the p h , s b i p p d of dope and ~ u b j b d pull. R w l Q will be WmYneoUs, however, if the mahrid i~ cat t t not ob m m m width md properly wcwed iQ the b3frkr'~ grip. A h m n a s o thh f test will be affwted by the dightast residue of dope on the sample, CAA SWL Ein Washinghu m y samp ham been h o r n b b t 20 m a & l a gma*r than thw would have had tbe fabric hen p q e r l y drippd. Thh i s the kind of error WE&a n a 4 y occur i the field. n Such a ample might have been subjected to a punch tmt and f d d . Y it & wmld appear h have p d t pull b test b m w a the dope residue did in fact Puw cam ~~ c a m a false reading. Another rwmn for hco-t test resdta ia that airerdt wv* can vary in skength o w its d a c e . Deteriorated and good cloth often exid side by aide. Wealmess may be =used by flaws or cracks in the dqm where mohture has enkred, or by m d posure t smshina Mewncm in ml- ~ 0 r k On d8Vd0pm-t of a fidd h 8 k o ored pigment may also permit one area of the impact type. This device canMARCH, 1958 83fH Mmcbesier Ave., St, Louis 17, Mo. A d m k h g SF-* At- C~~ the M d o a
For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.