» This article describes the farm machinery. For the municipality in Aurora, Philippines, see Baler, Aurora. A baler is a piece of farm machinery that's used to compress a cut and raked crop (such as hay or straw) into bales and bind the bales with twine. There are several different types of balers that are commonly used. Balers are also used in the material recycling facilities, primarily for baling plastic, paper or cardboard for transport to a recycling facility. Round baler The most frequen… (More on Baler)