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Heat-Shrink Tubing
Paul M. Cook, Richard W. Muchmore · Public domain (expired patent)
Ed

Nilikha ni

Ed

22. Setyembre 2026FI
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Heat-Shrink Tubing

Paul Cook founded Raychem in 1957 to use radiation chemistry: electron beams that cross-link polyethylene chains so the plastic no longer melts, only softens. Such a material has a memory. Stretch it while hot, cool it stretched, and it keeps the new size until heated again - then it shrinks back tight onto whatever is inside. **US 3,086,242**, "Process and apparatus for producing materials having plastic memory", Cook and Muchmore, assigned to Raychem, filed 15. July 1960, granted 23. April 1963: tubing carried through a heated zone in a pressure vessel, expanded as it emerges, and cooled while expanded - "dimensionally heat-unstable tubing". **You measure the memory and use it**: free-shrink a sample and check where the plastic went, then insulate a crimped wire splice.
Baguhan
1 hour

Mga Tagubilin

1

Measure as supplied

Cut 40 mm of 2:1 heat-shrink. Measure its flattened width, its wall (pinch one wall in the caliper) and its length.

Mga materyales para sa hakbang na ito:

Heat shrink tubingHeat shrink tubing1 piraso

Mga kailangang kasangkapan:

Kutsilyong pantallerKutsilyong pantaller
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
2

Shrink it free

Hold it in the helping hands and heat evenly with the heat gun, keeping the gun moving, until it stops changing. Let it cool; measure inside diameter, wall and length again.

Mga kailangang kasangkapan:

Pang-init na baril na hanginPang-init na baril na hangin
Helping handsHelping hands
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
3

Crimp the splice

Slide 40 mm of heat-shrink onto one wire first. Strip 6 mm from both wire ends, push them into a butt splice and crimp each side. Tug each wire to 20 N on the spring scale - it must not pull out.

Mga materyales para sa hakbang na ito:

Kawad na pandugtongKawad na pandugtong1 metro
Walang-insulasyong pandugtong ng kawadWalang-insulasyong pandugtong ng kawad1 piraso
Heat shrink tubingHeat shrink tubing1 piraso

Mga kailangang kasangkapan:

Pambalat ng kawadPambalat ng kawad
Pang-crimpPang-crimp
Panukat ng Puwersa (Timbangang Spring)Panukat ng Puwersa (Timbangang Spring)
4

Shrink it on

Centre the tube over the splice with 10 mm overlap onto the insulation each side. Heat from the middle outwards so air is pushed out, not trapped.

Mga kailangang kasangkapan:

Pang-init na baril na hanginPang-init na baril na hangin
5

Test the insulation

Wrap aluminium foil tightly round the shrunk sleeve. Set the multimeter to its highest resistance range and measure between the wire and the foil: it must read open circuit. Then check the wire end to end: near zero ohms.

Mga materyales para sa hakbang na ito:

Palara ng AluminyoPalara ng Aluminyo1 pilyego

Mga kailangang kasangkapan:

MultimetroMultimetro
6

Shrink ratio and conservation

Naglo-load ng Jupyter notebook…
7

History & Context

**What the patent specifies:** tubing heated, expanded under pressure as it leaves a vessel, and cooled while expanded, to give material with plastic memory. **Modern build (derived):** commercial 2:1 polyolefin heat-shrink. Heat-shrink replaced tape on aircraft, military and then all wiring harnesses; the same memory idea gives shrink film and pipe-joint sleeves. Its limits: it must be slid on before the joint is made, overheating chars it, and a thin wall offers little protection from abrasion.
Hakbang 7 - Image 1

Mga Materyales

4

Mga Kinakailangang Kasangkapan

9

Ang blueprint na ito ay gumagawa ng

Thumbnail
Placeholder

Heat shrink tubing

Free

196
0

Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

High-Pressure Polyethylene

High-Pressure Polyethylene

ni KarenSE

Paggawa ng Plastik

52
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PTFE (Polytetrafluoroethylene)

PTFE (Polytetrafluoroethylene)

ni MartinNO

Mekanika

46
0
0
0
0
0

CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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