Slavko, my experience suggests a different understanding of what is happening. In the laminator that I am using, the heat is applied between two plates; the rollers are on either side of these plates. Moving the board more slowly allows the board to get hotter before it encounters the pressure from the rollers. IOW, the rollers are not supplying any heat, only pressure.
--- In Homebrew_PCBs@yahoogroups.com, Slavko Kocjancic <eslavko@...> wrote:
>
> The speed controll is not right idea.
> They doesn't help. Even worse.
>
> When I put PCB in laminator I need aprox 6 times to repeat this to PCB
> get hot enought.
> If you observe laminator the roller inside does not have heater. The
> roller is heated by heater mounted by side of roller. So if we slow down
> the motor then roller will cool down quick as the rubber has smal
> thermal capacity. And the PCB radiate heat quick as it has big surface.
> So the beter way is to speed up that motor and make more passes. .. but
> I just live with original motor and speed 6 pass and modification in
> temperature regulation (180 centigrades) it's just work.
> If we want single pass work then the only way (with laminator) is to
> preheat board.
>
> Slavko.
>