* Q1 adj loss/shr $0.20 vs est EPS $0.11
* Q1 rev $184.7 mln vs est $192 mln (Follows alerts)
May 3 (Reuters) - Checkpoint Systems Inc posted a quarterly loss that surprised markets on higher costs related to the introduction of new products that hurt margins, but the company said margins would improve in the second quarter helped by price increases.
The company posted an adjusted loss of 20 cents a share for January-March, compared with analysts estimates of a profit of 11 cents.
Revenue for Checkpoint, whose products include radio-frequency identification tags and apparel labels, fell slightly to $184.7 million.
Operating expenses rose 7 percent.
Shares of the Thorofare, New Jersey-based company closed at $20.50 on Monday on the New York Stock Exchange. (Reporting by Divya Sharma in Bangalore; Editing by Sriraj Kalluvila) (email@example.com; within U.S. +1 646 223 8780; outside U.S. +91 80 4135 5800; Reuters Messaging: firstname.lastname@example.org))