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Sealing Cap

seal cap sealing

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3 replies to this topic

#1 Hans-Gabriel

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Posted 19 March 2015 - 16:42

I was wondering if a plastic seal in the cap is essential in the design of an aluminum  FP.  

 

Is it to protect the nib from drying or to prevent a chemical reaction between the ink and the aluminum or both ?

 

If the cap is not supplied with the nib unit, do you have suggestions where to get then ?

 

H-G



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#2 Algester

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Posted 22 March 2015 - 16:27

if your entirely kitless I think you can fashion the cap out of resin possibly else ebonite but I'm not sure how ebonite and metal and ink work together

#3 hatchetfish

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Posted 22 March 2015 - 20:42

An unlined aluminum cap (or any aluminum exposed to ink long-term) would corrode, yes. A second benefit is cap sealing, but isolating the metal from the ink is critical. Kaweco, for instance, use a plastic inner cap and a nib unit with a thread in plastic feed housing in their aluminum pens. Since they're cartridge/converter, the aluminum body, section, and cap are all isolated from ink, with the ink contained by the inner cap, feed housing, and cartridge.



#4 Hans-Gabriel

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Posted 23 March 2015 - 03:15

An unlined aluminum cap (or any aluminum exposed to ink long-term) would corrode, yes. A second benefit is cap sealing, but isolating the metal from the ink is critical. Kaweco, for instance, use a plastic inner cap and a nib unit with a thread in plastic feed housing in their aluminum pens. Since they're cartridge/converter, the aluminum body, section, and cap are all isolated from ink, with the ink contained by the inner cap, feed housing, and cartridge.

 

Good info hatchetfish, thank you!







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