Several kinds of fibers are used in the construction of polymer yarns. These are mainly made in a single step process. The polymer material possesses shape memory properties and can be twisted without softening the strands.
Some of these materials include EVA, PP, and TPU. These yarns have good adhesive strength, can be formed into hot melt yarn, and are resistant to xanthochromia. They are often used in home safety projects. They are also less expensive than hot melt systems. They are less complex and require less application equipment. They are less prone to tearing, and do not need hot viscous resin baths.
The outer coating can be made from a number of synthetic materials, such as polyester, polyamide, and other fibers. They are suitable for sunlight exposure. They are less flammable than glass and may extinguish on their own.
Polycarbonate plastic is also used in some of these yarns. It is flammable, but tends to extinguish on its own. It can be colored any hue. This material is also more lightweight and is less prone to damage.
The material can be used to coat the core of the yarn. This improves ribbon tearing toughness, and increases lear energy. It can also be used to enhance ribbon feel. It is typically added to a hot melt yarn to strengthen the active force between the warp thread and the weft yarn.
Another type of hot melt yarn is the twisted yarn. It is made in a single step process and is heat set below 260deg F. This process may be used to produce composite yarn. It is typically made from PE, PP, and EVA.
