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Polypropylene Felt: a Spunbonded Web, Kinney 1967
George Allison Kinney (Du Pont) · Public domain (US patent)
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Polypropylene Felt: a Spunbonded Web, Kinney 1967

A polypropylene felt made without weaving or needling: hot filaments are spun, pulled down by an air jet, given an electric charge so they spread apart, and laid in loops on a moving table until they form an even sheet. Kinney's patent (Du Pont, US 3,338,992, 1967) gives every setting for polypropylene. The corona runs at 20 to 25 kV: keep clear of it while it is live. The picture: the patent's own Fig. 1 (the process) and Fig. 7 (the web).
Osezingeni eliphezulu
1 day

Imiyalelo

1

Melt and spin

Melt polypropylene of melt index 10 in a screw extruder, no hotter than 290 °C. Meter it at 12 g a minute through a 1/4 in. sand filter and a 20-hole spinneret (holes 0.015 in. across): pack block 275 °C, spinneret 260 °C.

Izinto zokwakha zalesi sinyathelo:

Ama-pellet e-polypropyleneAma-pellet e-polypropylene500 g

Amathuluzi adingekayo:

I-extruder yepulasitikiI-extruder yepulasitiki
I-spinneretI-spinneret
I-pyrometerI-pyrometer
Isikali sesilinganisoIsikali sesilinganiso
Amagilavu EsikhumbaAmagilavu Esikhumba
2

Quench

Cool the bundle of filaments in a 6 in. quench chimney blowing 40 cubic feet a minute of room air in from the side.

Amathuluzi adingekayo:

I-compressor yomoyaI-compressor yomoya
3

Draw with the air jet

Lead the bundle 72 in. down into an air draw jet run at 25 psi: it pulls the filaments with about 3 g of tension and stretches them.

Amathuluzi adingekayo:

I-Air Draw JetI-Air Draw Jet
I-compressor yomoyaI-compressor yomoya
Isilinganiso SengcindeziIsilinganiso Sengcindezi
4

Charge the filaments

8 in. above the jet, let the filaments brush a 1 1/4 in. bar turning at 10 rpm, with a four-point corona 5/8 in. from it at minus 20 to 25 kV (100 to 150 µA). The charge pushes them apart. Keep clear while it is live.

Amathuluzi adingekayo:

Iyunithi yokushaja nge-coronaIyunithi yokushaja nge-corona
5

Lay the web

Catch the filaments on a grounded 47 in. square table that moves 26 in. a minute one way and 570 in. a minute the other. Each layer weighs 0.5 oz per square yard; lay several for each sheet.

Amathuluzi adingekayo:

Itafula LokubekaItafula Lokubeka
6

What you get

An even sheet of fine filaments, about 2.5 denier each, tenacity 2.0 g per denier, stretching 300 % before they break.

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso

Izinto

1

Amathuluzi Adingekayo

10

Le blueprint yenza

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