How to mount A4 paper for hard-pen calligraphy works?

Stick it to the bottom plate with double-sided tape and fix it with cardboard around.

It's best to write with thick and thin signature pens or boiling ink, so it's not easy to run out of ink and it's good for cursive writing. After the work is finished, just go to the painting shop and frame it. The disadvantage is that it is not conducive to writing regular script. Written works are not as free as when written with a pen. If you write with a pen, it is easy to run out of ink, which is not conducive to mounting. You can only stick it on the bottom plate with double-sided adhesive tape and frame it with cardboard around it.