Platinum's Slip & Seal Mechanism

                                         

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:

• Ink drying out due to moisture evaporation.
• Problems with dried ink if the pen is not used for three to six months.
• It can be necessary to clean the pen using or even to repair or replace the nib itself if the damage due to dried ink is too severe.

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.