Content
Fundamentals concerning plastics
Extrusion welding
Extrusion welding
Cooling-off phase
After the joining process is carried out under pressure, a substance-to-substance bond is produced during the subsequent unpressurised cooling-off phase.
The thermal contraction and recrystallisation of the material lead to a volume reduction of the welding seam of up to 8 % [Gehde03].
In order to enable the sinking of the seam during the cooling-off phase and therefore to work against cavity formations in the centre of the seam, one should pay attention to a plain seam top (shape of welding shoe) during the welding process.
Show / hide the Table of Contents
Go to previous page
Go to next page
Show additional information for the current page
Show this help