Screwing strategy
Joining plastic
The plastic direct screw connection has proven itself in the field of mechanical connection technology and has been used successfully for more than 30 years. Users can get to grips with screw connections in plastic with the Koala process from Desoutter.
The material properties that plastics achieve depend primarily on the subsequent processing method. Compared to metal screw connections, the preload force in thermoplastics is essentially created by the deformation of the plastic. This means that it makes sense to take a close look at the processing, design specifications and properties of the material to be fastened. The joining technology of plastics is closely related to overall product development; all necessary process steps must be coordinated with the material properties, shaping and assembly as early as the design phase.
Reliable fastening is fundamentally linked to the reproducibility of the fastening results and the precision of the screwdriver. This requires a suitable choice of tool and assembly location. In direct fastening, the thermal properties of thermoplastics are used to form the nut thread with low stress and without cracks. Manual tightening is not recommended here because it is not continuous and the speed is far too low. Depending on the fastening class and tightening form, the tools must be able to measure control and/or control variables directly or indirectly. The higher the fastening class and the degree of automation, the higher the requirements for the tool used and the documentation capability. pb
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