VOIDS on Solder joint (backside of D2PAK heatsink)

Hi!,

Can anyone help me with problems with Solder voids after reflow curing on D2PAK heatsinks? I would like to remove the gas from the solder paste; can centrifuge help?How many minutes should a solder paste in a tube be processed in a softener? How does a centrifuge process differ from a softener? I hope anyone can help me.

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