SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
PTFE Thread Seal Tape: Paste-Extruded, Calendered, Never Sintered
The white tape wound on pipe threads is PTFE that has never been melted. Fine PTFE powder is mixed with a lubricant, pressed into a slug, squeezed through a slit die by a ram, rolled thin between two rolls, and dried. Kept below the sintering heat (about 350 °C) it stays soft and conforms to the thread (process: US 5,415,939, 1995). The targets and tests are those of the Indian standard IS 14643 (from BS 4375): no fillers, at most 0.1 % lubricant left, usually 12 mm wide and 0.075 mm thick.
The lubricant (naphtha) and the slitter are ours. The picture: Fig. 1a of the patent.
Juu
1 day
Maagizo
1
1
Wet the powder
Wet the powder
Mix fine (dispersion-made) virgin PTFE powder with a lubricant that can be driven off completely. Granular PTFE will not paste-extrude. No fillers. Ours: naphtha, as required.
Vifaa kwa hatua hii:
Unga laini wa PTFE1 batchZana zinazohitajika:
Nafta2
2
Press a preform
Press a preform
Compact the wet powder into a cylindrical preform in a mould with a plunger.
Zana zinazohitajika:
Kalibu ya kubana
Mashine ya kubana ya haidroliki3
3
Ram-extrude a flat tape
Ram-extrude a flat tape
Put the preform in the extrusion press. The plunger pushes it out through a slit die as a thick flat tape.
Zana zinazohitajika:
Mkandamizo wa haidroliki wa kitoaji4
4
Calender it thin
Calender it thin
Pass the tape between two counter-rotating rolls to a thin tape, aiming at about 0.075 mm.
Zana zinazohitajika:
Kinu cha kuviringisha metali
Maikromita5
5
Dry off the lubricant
Dry off the lubricant
Dry the tape until the lubricant is gone. Keep it well below the sintering heat (about 350 °C): sintered tape is stiff and will not seal.
Zana zinazohitajika:
Tanuri la kukaushia6
6
Slit and spool
Slit and spool
Slit it to width, usually 12 mm (±0.5 mm), and wind it on spools.
Zana zinazohitajika:
Mashine ya kupasua na kuzungusha upya7
7
Check the tape
Check the tape
It must look white, with no visible specks or torn edges. Measure the thickness at five points along a sample; each must be within 10 % of their mean.
Zana zinazohitajika:
Maikromita8
8
Test the residual lubricant
Test the residual lubricant
Weigh about 15 g of tape. Extract it in a Soxhlet with petroleum spirit (40-60 °C) for at least 4 h, dry it at 100 °C, then heat it at 300 °C for 6 h, cool and weigh. The loss must be 0.1 % or less.
Zana zinazohitajika:
Kichujio cha Soxhlet
Etha ya petroliTanuri la kukaushia
Kalibu ya chuma
Chemba ya kukausha (ndogo)
Mizani ya usahihi9
9
Wrap a thread
Wrap a thread
Wind tape round an R 1/2 taper pipe thread with 50 % overlap, two layers deep, just tight enough to take the thread form. It must hold the form, not break, and its end must stay put.
Zana zinazohitajika:
Kiungio cha bomba chenye nyuziVifaa
1- 1 batchKishikilia Nafasi
Zana Zinazohitajika
14- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.