by 2017 Abstracts No Comments

Conventionally Hotmelt- and Pressure Sensitive Adhesives are produced in discontinuous Mixers. Advantageous in the batch method is the easy feeding and possibility for subsequent recipe adjustment during the ongoing process.

However, there are substantial disadvantages such as limited viscosity ranges, difficult cleanability, increased personnel requirements and batch-wise fluctuating quality.

The continuous production of HMA and PSA, especially in twin-screw machines, is gradually displacing the conventional batch method. The modern continuous method offers considerable benefits such as final product shortly after start-up, wide range of viscosities, short thermal stress, quick recipe change due to self-cleaning, consistently high quality and a high degree of automation.

The characterization of advantages associated with the continuous production of adhesives depends on the underlying machine concept. Within a machine concept the individual constructive designs are decisively determining the process and process capabilities for the adhesives production.

In the lecture the conventional discontinuous production is compared with the modern continuous production method.

The focus is on the co-rotating twin-screw extruder as market representative and cutting edge technology for the continuous production of Adhesives. In addition to Hot Melt and Pressure Sensitive adhesives an outlook on production of reactive, polyurethane-, silicone- and silane-based sealant and adhesive systems is given.

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