Hot Melt Pressure Sensitive Adhesives (HMPSAs) are composed of Styrenic Block Copolymers (SBC), tackifier, mineral oil, a small amount of antioxidant, and other special additives - such as filler, colorant, and low molecular weight polymer if needed. Most of these ingredients are thermoplastic materials and require a heated environment to mix them together.
Many different types of mixers are available for mixing HMPSAs. Following are two commonly used techniques.
1. Vertical mixer. This is the most economic technique for making HMPSAs. Low molecular weight ingredients, oil and/or tackifiers, must be charged first for this type of mixer. Otherwise, the high torque generated from SBC may damage agitators. Commonly used charging sequence is… Read Article>>
Production of Hot Melt Pressure Sensitive Adhesives
- by Pierce Covert, Glue Machinery Corporation