IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Plasticised PVC (Plastisol)
PVC was known for decades as a hard, brittle powder nobody could use. In 1926 Waldo Semon at B.F. Goodrich found that certain liquids dissolve it only when hot, and that the hot solution sets on cooling into a soft, rubber-like gel - flexible PVC.
**US 1,929,453**, "Synthetic rubber-like composition and method of making same", Semon, assigned to B.F. Goodrich, granted 10. October 1933, claims dissolving "an insoluble polymerized vinyl halide at an elevated temperature" in a liquid that dissolves it only well above room temperature, and gelling it by cooling. One example: 8 parts PVC, 8 parts tricresyl phosphate, 3 parts dibutyl phthalate.
**Plastisol is that idea in a bottle**: PVC grains suspended, undissolved, in plasticiser. Heat makes the liquid dissolve the grains and fuse into solid flexible PVC. You bake test films at three temperatures and pull them apart to find where it truly fuses.
Olùbẹ̀rẹ̀
2 hours
Ìlànà
1
1
Ventilate and set the oven
Ventilate and set the oven
Use a toaster oven kept for crafts, never food, by an open window. Put the probe thermometer inside - dial settings are rarely accurate.
Àwọn irinṣẹ́ tí a nílò:
Ìléru orí tábìlì
Ẹ̀rọ ìwọ̀n ooru oníhun tí ó dúró sí inú
Ìbòjú ìmí N952
2
Stir the plastisol
Stir the plastisol
The PVC grains settle. Stir the plastisol from the bottom for 2 minutes until even. Read the label's fusion temperature.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Plastisol150 mlÀwọn irinṣẹ́ tí a nílò:
Ọ̀pá Ìrúwé3
3
Spread three films
Spread three films
On the silicone mat, spread three 100 x 40 mm films about 1.5 mm thick with the palette knife.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Plastisol50 mlÀwọn irinṣẹ́ tí a nílò:
Ẹní ìdáná silicone
Ìdìpọ̀ ọ̀bẹ paleti
Ìwọ̀n Irin4
4
Bake at three temperatures
Bake at three temperatures
Bake one film 10 minutes each at 130 °C, 150 °C and the label's fusion temperature (commonly 160–180 °C). Never exceed the label maximum.
Àwọn irinṣẹ́ tí a nílò:
Ìléru orí tábìlì
Ẹ̀rọ Ìwọ̀n Ooru Infurarẹ́dì
Ìbọ̀wọ́ wẹ́lídìn5
5
Cool and cut strips
Cool and cut strips
Cool 10 minutes. Peel each film and cut a 10 mm strip from its centre. Mark its temperature.
Àwọn irinṣẹ́ tí a nílò:
Ọ̀bẹ iṣẹ́Ìwọ̀n Irin6
6
Stretch and pull
Stretch and pull
Clamp one end in the vise. Hook the spring scale to the other and pull slowly. Record the peak force and how it failed.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Ìwọ̀n Agbára (Òṣùwọ̀n Ìsúnkì)
Ìdìmú Tábìlì
Gílásì Ààbò Tí Ó Mọ́7
7
Recipe, cure curve, siblings
Recipe, cure curve, siblings
Ń ṣí ìwé Jupyter…
8
8
History & Context
History & Context
**What the patent specifies:** gelling PVC in high-boiling liquids such as tricresyl phosphate and dibutyl phthalate. **Modern build (derived):** a commercial plastisol; many now use phthalate-free plasticisers.
Flexible PVC became cable insulation, shower curtains, hoses and flooring. Its limits: the plasticiser slowly migrates out, so old soft PVC stiffens and turns sticky; and overheated PVC yellows and releases hydrogen chloride, which is why the label's maximum temperature matters.
Àwọn irinṣẹ́ tó nílò
13- Àyè
- Àyè
- Ìbọ̀wọ́ wẹ́lídìnìdá 10%Àyè
- Àyè
- Àyè
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
CC0 Àgbègbè Gbogbogbò
Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.
Ṣàtìlẹ́yìn Olùṣẹ́dá nípa rírà àwọn ọjà nipasẹ̀ Blueprint wọn Ẹ̀san Olùṣẹ́dá tí àwọn Olùtajà gbé kalẹ̀, tàbí ṣẹ̀dá àtúnṣe tuntun ti Blueprint yìí kí o sì fi sínú Blueprint rẹ gẹ́gẹ́ bí ìsopọ̀ láti pín owó-wíwọlé.