Hot melt adhesives and applicators

The parts need to be joined while the applied hot melt adhesive can still be worked. Open time depends on the specific product and application conditions; it does not describe the later service temperature or complete curing. Check the material and surface of both parts, the intended application method and the sequence up to joining. The data sheet for the selected adhesive is the basis for setting the process.

Thermoplastic hot melt adhesive solidifies as the melt cools. A reactive polyurethane hot melt is also applied warm, but then additionally crosslinks through moisture. Initial strength and final cure therefore need to be assessed separately for reactive systems. Both groups are available as hot melt adhesives; the choice depends on the parts, processing and subsequent loads. Any claim about resistance applies only to the specific product that has been assessed.

That can only be decided for the specific joint. The range describes an EVA-based hot melt adhesive for cartons, cardboard and fabric, while a polyamide hot melt adhesive is also offered for applications involving electronic components. This does not mean every EVA or polyamide formulation suits those tasks. Check surfaces, geometry, loads and processing requirements against the relevant product data sheet, and test the bond on the intended component.

Describe both parts and their surfaces, the bonding area, intended loads and environmental conditions. For processing, explain how the adhesive will be applied, the joining sequence, the time available before joining and the planned equipment. If you already use an adhesive or applicator, its exact designation and the required supply form help with assessment. Krückemeyer GmbH can then discuss product selection and outstanding technical questions with you.