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.
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