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Youblob · CC0
Rubber Thread: One Long Strand Cut Spirally from Cured Sheet (Gibbons 1934)
The rubber in elastic webbing and braided elastic is not spun: it is cut. A thin cured sheet is wound on a big drum and a small fast circular knife, walked across the drum by a lead screw, cuts it into one long square strand. How fast the knife travels sets the thread's width. This is how Edwin Gibbons described the American practice in 1934.
Source: E. J. Gibbons, "Rubber Thread in Narrow Fabrics", India Rubber World, 1 July 1934. Starting from our cured rubber sheet and the tools are ours. Picture drawn by Youblob.
Kati
1 day
Maagizo
1
1
Start from thin cured sheet
Start from thin cured sheet
Take thin vulcanised rubber sheet, hung up and dried. Gibbons's sheets were gauged in hundredths of an inch; for a square thread, cut it as wide as the sheet is thick (ours).
Vifaa kwa hatua hii:
Bati la mpira asilia1 as requiredZana zinazohitajika:
Kichanja cha Kukaushia
Kipima-unene cha dijitali cha inchi 62
2
Wind it on the drum
Wind it on the drum
Wind the sheet on a large drum (his were 6 to 7 feet across) and fasten the ends.
Zana zinazohitajika:
Mashine ya kukata uzi wa mpira3
3
Cut with the travelling knife
Cut with the travelling knife
Turn the drum very slowly and bring a small, high-speed circular knife against the rubber. A long lead screw carries the knife across the drum face; its speed against the drum sets the width of the cut, and so of the thread.
Zana zinazohitajika:
Mashine ya kukata uzi wa mpiraKipima-unene cha dijitali cha inchi 64
4
Tie, unwind and dust
Tie, unwind and dust
Tie the many cut ends together. As the drum is slowly unwound, dust the thread lightly with talc so the cut edges do not stick together.
Vifaa kwa hatua hii:
Unga wa talki1 as requiredZana zinazohitajika:
Mashine ya kukata uzi wa mpira5
5
Wash, dry and chain
Wash, dry and chain
Wash and dry it again, then link it in a chain stitch for keeping: a "chain of rubber".
Vifaa kwa hatua hii:
Maji1 as requiredZana zinazohitajika:
Kichanja cha KukaushiaVifaa
3- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
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