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
Repositionable Microsphere Adhesive
In 1968 Spencer Silver at 3M, trying to make a very strong adhesive, made the opposite: an acrylate that formed tiny tacky spheres and held only lightly. For years it had no product. In 1974 his colleague Art Fry coated it on bookmarks for his church hymnal so they would stay put without tearing the pages; the sticky note reached shops in 1980.
**US 3,691,140**, "Acrylate copolymer microspheres", Silver, filed 9. March 1970, granted 12. September 1972: "inherently tacky", elastomeric microspheres of an acrylate ester such as iso-octyl acrylate with a small share of an ionic monomer.
**You measure what makes it different from tape**: the peel force over twenty re-sticks, side by side with masking tape, and the spheres themselves under a microscope.
Olùbẹ̀rẹ̀
1 hour
Ìlànà
1
1
Look at the stripe
Look at the stripe
Put a sticky note's adhesive stripe under the digital microscope at high magnification. Beside it, a strip of masking tape. Capture both; measure the bead size and spacing on the note.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bébà àkọsílẹ̀ alálẹ̀mọ́ tí a lè tún lẹ̀1 pad
Tépù ìbòmọ́lẹ̀1 ìyípoÀwọn irinṣẹ́ tí a nílò:
Mákírósíkóòpù Oní Nọ́ńbà2
2
Clean the glass
Clean the glass
Wipe a glass sheet with isopropyl alcohol and let it dry. Cut the masking tape to the same 25 mm width and 75 mm length as the note's sticky area.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọtí Isopropyl 99 %10 ml
Bébà ìnukàn1 ewéÀwọn irinṣẹ́ tí a nílò:
Àwo dígí
Ìṣẹ́ná
Ìdíwọ̀n3
3
Peel at 90 degrees
Peel at 90 degrees
Press the note and the tape onto the glass with one firm thumb stroke each. Clip a paper clip to each free end, hook the spring scale, and peel straight up, slowly. Record the steady force.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ohun ìdì ìwé2 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Ìwọ̀n Agbára (Òṣùwọ̀n Ìsúnkì)4
4
Re-stick and repeat
Re-stick and repeat
Stick the same pieces down again in the same place and peel again. Record peel 1, 2, 5, 10 and 20.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Ìwọ̀n Agbára (Òṣùwọ̀n Ìsúnkì)5
5
Peel ladder and contact area
Peel ladder and contact area
Ń ṣí ìwé Jupyter…
6
6
History & Context
History & Context
**What the patent specifies:** inherently tacky, elastomeric, solvent-insoluble acrylate copolymer microspheres made by suspension polymerisation with an ionic comonomer. **Modern build (derived):** a commercial sticky-note pad, tested.
The same idea now holds repositionable labels, wall graphics and removable flags. Its limits: a weak grip by design, fading tack as dust and fibre collect on the spheres, and poor hold on rough or damp surfaces.
Àwọn ohun-èlò
5- 1 ìyípoÀyè
- 10 mlÀyè
- 1 ewéÀyè
- 2 ẹyọÀyè
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