It is lightweight, non-allergenic and cannot be harmed by moths or mildew. The loft and weight of the batting will vary with the number of layers used in the blanket. Additional processes are necessary to produce the variety of polyester batting available today. The blanket, as it comes off the carding machine, is called unbonded batting. It is available in many weights and thicknesses, with three inch most often the thickest loft available commercially.
Unbonded batting has many drawbacks.
Its loose construction makes it difficult to work with, and often, high and low areas develop. To lessen the chance of fiber migration, it is advisable to cover the unbonded batting with cheesecloth or a lightweight fabric. The high-loft, unbonded batting is a popular choice for tied comforters. Bonded Batting Bonded batting, on the other hand, has a light resin coating or glaze applied to both sides of the batting. This coating adds strength and locks the fibers to help prevent fiber migration.