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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.
Àárín
1 day
Ìlànà
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).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ewé rọ́bà àdánidá1 as requiredÀwọn irinṣẹ́ tí a nílò:
Àká Ìgbẹ
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 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.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìgé okùn rọ́bà3
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.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìgé okùn rọ́bàÒṣùwọ̀n Kálípà Díjítà Ìnṣì 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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìyẹ̀fun talcum1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìgé okùn rọ́bà5
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".
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Omi1 as requiredÀwọn irinṣẹ́ tí a nílò:
Àká ÌgbẹÀwọn ohun-èlò
3- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
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