Hardcover journal printing typically involves a process called case binding, where the pages of the journal are sewn together and then attached to a hardcover made of cardboard or a similar material. Here are the basic steps involved in hardcover journal printing:

1. Design: Create a design for your journal cover, spine, and interior pages. You may also need to choose paper types and weights.

2. Printing: Print the interior pages of your journal on a high-quality paper stock. This can be done using a digital or offset printing process.

3. Binding: Bind the pages together using a sewn binding process. This involves folding the pages and sewing them together in small groups called signatures.

4. Case making: Create the hardcover by cutting and folding a cardboard or similar material to the right size, then covering it with your chosen material, such as book cloth or leather.

5. Case binding: Glue the sewn pages into the case, and attach the endpapers to the inside of the cover.

6. Finishing: Add any final touches, such as foil stamping or embossing, to the cover and spine.

There are many printing companies that offer hardcover journal printing services. When choosing a printer, consider factors such as quality, price, turnaround time, and customer service. It's also a good idea to ask for samples of previous work to get an idea of the quality of their printing and binding.