What is a duplex card?
Most of the digital and offset presses today, including laser printers, can only print up to a certain thickness, mostly 14pt-16pt. This is where duplexing comes in. Duplexing is the process of pasting multiple sheets of paper together to produce one thicker sheet. For instance, gluing two sheets of 14pt cover stock paper will produce a 28pt thick card. Having this added thickness is another way we increase the unique impact and tactility of our work.
Why duplex cards?
One reason for duplex cards would be to produce a more premium, deluxe card that is high quality and thick.
Another reason for duplexing cards is that certain finishing options will produce bruising or indentation, caused by the pressure from the press. For example, during letterpress printing, where the desired deboss feel is produced, a slight embossing can be seen and felt on the opposite side; similarly, with embossing, the effects will be visible.
Nevertheless, not all papers are produced in a heavy stock weight. Even with a thick stock like 160lb cover, a heavy impression will show on the other side.
What Captain Recommends
Use different type of paper on the front and back of the card for added effect;
Make duplex, triplex and quadplex cards using multiple sheets of colors to a unique look;
Add different color stock to the middle instead, to color the seams;
Edge paint the edges of your duplex cards to highlight the thickness of the card;
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Frequently Asked Questions
No, the industrial glue used for duplexing is a permanent adhesive and will not loosen.
You can glue quite a few sheets together; it can be as many sheets as necessary to achieve the desired thickness on the duplex cards.
Yes! Mix and match the colors you would like to have displayed in the seam of your duplex card. You can even choose a thick cover stock, sandwiched between to lighter-stock paper, tucked in between the front and back of your card. Changing the thickness of paper inserts enhances the effect you are trying to achieve.