Just repeated the temperature measurements using a different
thermocouple. Temperatures at one inch from the end of the rollers
are in the 285 F to 290 F range. Temperatures at the middle of the
rollers are in the 295 F to 310 F range. My temperature measurements
vary, possibly indicating the heating mechanism is cycling off and on.
These temperatures don't sound very high to me. Yet my laminator
works like a charm. Perhaps it is telling us that the optimum
transfer temperature is lower than we might think.
--- In Homebrew_PCBs@yahoogroups.com, "Radra" <infositeus@y...> wrote:
>
> I measured the roller temperature as 287 degrees Fahrenheit (142
> degrees Celsius). This measurement was rather tricky to make. I
> fed the thermocouple into the H200 laminator and attempted to turn
it
> off just as the thermocouple junction entered the rollers. Can't
> actually see to verify the thermocouple is properly placed so
> measurement may be low. Repeated measurement several times and
> always found temperatures to be in the high 270s or low 280s ranges.
>
> According to a prior post, the temperature should have been 361 F
> (183 C). There is a large discrepancy here. I might repeat the
> measurement tomorrow using a different thermocouple. Perhaps
someone
> can suggest a better measurement technique.
>
> Lyman