HotMelt Adhesives (HMA) Manufacturing for Book Binding, Packaging and Courier Bag.Profitable Adhesives Production Business Ideas for Entrepreneurs.
Hot melt adhesive (HMA), also referred to as hotglue, may be a variety of thermoplastic adhesive that's commonly sold as solidcylindrical sticks of varied diameters designed to be applied using a hot gluegun. The gun uses a continuous-duty component to melt the plastic glue, whichthe user pushes through the gun either with a mechanical trigger mechanism on thegun, or with direct finger pressure. The glue squeezed out of the heated nozzleis initially hot enough to burn and even blister skin. The glue is tacky whenhot, and solidifies during a few seconds to at least one minute. Hot meltadhesives also can be applied by dipping or spraying, and are popular withhobbyists and crafters both for affixing and as an inexpensive alternative toresin casting.
In industrial use, hot meltadhesives provide several advantages over solvent-based adhesives. Volatileorganic compounds are reduced or eliminated, and therefore the drying or curingstep is eliminated. Hot melt adhesives have long time period andusually are often disposed of without special precautions. a number of thedisadvantages involve thermal load of the substrate, limiting use to substratesnot sensitive to higher temperatures, and loss of bond strength at highertemperatures, up to complete melting of the adhesive. This will be reduced byusing a reactive adhesive that after solidifying undergoes further curing e.g.,by moisture (e.g., reactive urethanes and silicones), or is cured byultraviolet radiation. Some HMAs might not be resistant to chemical attacks andweathering. HMAs don't lose thickness during solidifying; solvent-basedadhesives may lose up to 50–70% of layer thickness during drying.