โ Scribed by Marszewska-ziemikcka, Madame Jadwiga
No coin nor oath required. For personal study only.
reinnin rigid i i i i d ;ire rc:itly for the niiirkct. T h c size of tlic slicct which is ninnufiicturcd is iisiinlly 20 in. 1' s I(\ in.
To ret,urn to t . 1 ~ extruding nincliinc, t,hc iiint erinl which hns to bc made into rods is cut. off in 30-in. or 4O-in. lengths, cooled, nnd plncctl in tmys. If tuhcs :ire requirctl, the iioezlc of thc cstxiitling niiicliiiic is fitted with ii screen \rliicIi ciirrics cciitmlly a pin. 'i'liis pin pnsscs t,lirough tlic nozzlc :ind ninp project, sliglit ly at tlic nioiitli of tlic iiozelc. 'rlic niatcrinl flows roiiiid t,he pin iind so fornis tlic rcqiiircd tubc. Tho t,ul)es : I I I ~ rods iirc plnccd in trays iind then pnss into tlic foriiinldchydc tniiks wlicrc tdicy reinnin unt il complctc fornializiug tnkcs pliicc. The circulnt.ion of t,hc forniiilin in tlic tnnks is of tlie ut,niost. import:incc, as is also nn :iccurntc tcnipcniturc coi:t,rol. Both these fnctors hnvc ii dcfinitc bearing on t,he length of tirnc rcquircd in t,hc forninlizin~ process. \'lien t,hc . rods and tubcs arc comph!tcly forinnlizctl, t,hcy iirc dried in rotating driinis throiigli which hot nir is pnsscd. !L'licy conic out, of 1 . 1 1 ~ drurns at the end of tlic drying ~iroccss pcrfcctly strnig!t. This finishes the nctuiil ni:inufricturiiig process. Sanding t.hc sheet to a sniooth surface, tmpping thc rods (\vIiicli is n process of cciitml grinding) t,o nccurntc dimensions, and fiually polishing, 110th shcrts nnd roils, arc niorc in t.lie nnturc of finishing opcriitions t;linn nct.unl mnniifncture.
Propertics of /Ire )~m/eric~l.-l'lic spccific gravity of tlic crisein plnstic nintcrial is 1 *33 to 1 e3.1 ; age nntl ntinosphcric conditions inny C:IIISC n rnriiition of t.lic figure ranging o mn 1inlf 1)cr ccnt. citlicr \ray.
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