β Scribed by Willshaw, H.
No coin nor oath required. For personal study only.
Cher:illy, u h -c n hrgc iiiass of rubber, such :is :I solid tyrc or rubbcr block nnd thc likc, is to Lac vulcaniscd, n slow hcating or \vnriuiiig-iip period is giveit, t o bring tlic iiinss t o n gcncrnl tcmpcrature tlirougltout, following ivliicli t,lic tenipcratiire is raised to cffcct vulcnnisation.
The nrticlcs cured on tltesc lines linvc d i n t is cnllcd '' stcppccl " rulcnnisntions to distinguish tlieni froin t-hose \vherc the stenni pressurc itiiiiicrlintcly rises to a innxiinurn viilcnnising prcssitrc, aiid is lield them over n tlefiiiite t.i nit.
11 ccelercc/ors 3lany rubbcr goods, cspecinlly such itciiis as ~mciinint.ic :i tit1 solid tyrcs, rcquirc n rerp lengthy period of vulcnnisntion, and in view of t,hc hcavy cost of this operation tlirougli tliis factor of time and tlic ndclitioiinl factor of cspensivc pliint., every effort is nindc to reduce tlic titile for vulcnnis n t' ton.
Tlic substnnces wlticli Iinvc been used to rcducc tlic tiiiic for vulcniiisiitioii nrc knomn iis nccclcrntors. C'onimon forms arc litliitrgc, tn:igncsiiuii osiilc, derivatives of aniline, etc.
If thc tiinterin1 is tliin, nntl n.ltcrc ritbbcr iiiisings arc used cot~tniitittg such nctivc ncceleriitors ns snnthntc, npprccinble vulcnnisatioti liiity tnke pliicc a t ordinary rooin tcmpernturcs, niitl with dcvclopnieiit along tltcse lines, i t is quitc possiible that wit11 sucli nrticles, scpnrntc viilcnnising openitions niny not bc neccssnry.
On the cltctniciil action of siicli iiccclcmtor;., tlic author docs not propose to tortcli, but refers to tltcui ns :I tnen~ts \rhcrel)p tlic clictiiist cnii co-opcrntc witlt tlic etigincer iii rediiciiip nioiililirtg costs.
Altltougli tlic foregoing dcscriptions Itnvc rcferrcd to tlic niouldittg and ~~ulcnnisiit~ion of tyres, prncticnlly nll rubber articlcs follow one of tltc processcs tlcscribctl, iis for esntnplc :-
π SIMILAR VOLUMES
It. It. Tiitlock. IIoii. Trrasarer : 11. . J. C / i r ~~n I ~d . Uoti. Local Seerstarb : -1. Stniiluy Miiir, Ciioinicnl Lnhrutory, Univerui1.X of G~ILSKOW. h'0ticc.r of 1% or8 niid Commuiiicntioiis for tho Jfcctiiies to bo coiit to thc LociirSccrotnr$. Tliu iinnics iii itnlirs nrc tli0.0 of riiciiib
I ( 5 ) More than ono qrialitv of rubber cqm oiind. inny be employed in uiakhg i4p np a r t i c t , for 1 instnncc, tlie sole, lieel and upper of a shoe, and Afcclinq kcld u1 Glauqoio on TuesdnU, 20th d p r i l , I 1915. ! ( 0 ) Tlie r:uv material rimy not be uniformly 1 inivecl nnd tlie vulcanisati
Proton spin-lattice relaxations in the laboratory and rotating frames, together with transverse relaxation (free induction decay), have been measured for natural and epoxidised rubber, plus a series of vulcanised samples. The data have been analysed by fitting procedures to give characteristic times