. India rubber world. volved in its process of its manufacture is interesting enough to serve asan excuse for going a little into detail as to how these pensare made. ROLLING THE RUBBER INTO rubber goes through the usual processes of washing, dry-ing and mixing, the proportion of sulphur being about 33 percent, of the wi;ight of the rubber. From the mill therubber is passed through sheeting rolls, as shown in ^Figure 2,and the sheets are cut into strips which form the barrel andcap of the fountain pen. These strips are rolled on smallspindles of the required
. India rubber world. volved in its process of its manufacture is interesting enough to serve asan excuse for going a little into detail as to how these pensare made. ROLLING THE RUBBER INTO rubber goes through the usual processes of washing, dry-ing and mixing, the proportion of sulphur being about 33 percent, of the wi;ight of the rubber. From the mill therubber is passed through sheeting rolls, as shown in ^Figure 2,and the sheets are cut into strips which form the barrel andcap of the fountain pen. These strips are rolled on smallspindles of the required diameter, the rolling being done on aheated, smooth steel table. Foil is wound over the rubber, andthe spindles, with their rubber covers, are deposited in steelboxes and buried in powdered soapstone. These boxes are put in vulcaniiccrs, the open steam cure being 300 degrees for about14 hours. The rubber should be hard enough to keep its shape and yetmust have sufficient resiliency so that all the joints will fit to-. Fic. 2. Rolling the Rubuer out into Sheets of the Re-quired Thickness. gether ink-tight. In other words, it will not do to vulcanize thepens too hard. While considerable machinery is used, there is much hand worktliat requires exceptional skill, for, with the exception of thechasing, all the work after the pen has been vulcanized requiresa combination of delicate mechanisms and skilled workmanship.
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidindiarubberworld49phil
