The innovative cap contains a unique “Slip & Seal” mechanism that prevents ink from drying out in the pen.
When a fountain pen has a push-fit cap there is an airtight seal, however opening and closing the cap causes ink to spurt out due to a change in air pressure, which is called pumping, and it is extremely hard to prevent this occurring.
It has been considered difficult to make an airtight pen with a screw-type cap and if not sealed tightly, the following problems can result:
At the request of customers, Platinum Pen Company went back to the basics to deal with this problem. The #3776 Century was the first fountain pen to have their unique “Slip & Seal” structure in a pen with a screw-type cap. Thanks to this innovation it is possible to have a screw-type cap with complete airtightness.
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