Baked Plate _ Image expand 2 mm

[kala]

Hi we are backing the plate past 3-4 year we never faced any issues but recently we are getting feedback from customer that 1mm or 2 mm image expanded on plate , is it possible image expand on baked plate or need to check the regular jobs or rip too...

any advise

regards
kala

[gordo]

Hi we are backing the plate past 3-4 year we never faced any issues but recently we are getting feedback from customer that 1mm or 2 mm image expanded on plate , is it possible image expand on baked plate or need to check the regular jobs or rip too...

any advise

regards
kala

Aluminum plates expand and contract just like film as temperature changes.

best, gordo

[maxon]

Plates should return to their initial size upon cooling as they exit the oven unless something goes wrong. Plates may suffer permanent expansion if overheated and coating color will also change a lot : check the air circulation inside the oven and temperature control accuracy. The plates will also buckle if the thermal stress is significant and/or heating is not uniform. Let's not forget offset plates are not just aluminum sheets, coating does play a role. I wouldn't blame the baking for a permanent expansion of 2 mm though, unless you bake very large plates i.e. B1 size plus.
Do a test, reduce the oven temp setting by 30-40 deg. C and increase baking time, see what happens.

[Alois Senefelder]

Hello Kala,


A PDF - Baking Aluminium Alloys AA3103/1050



Regards, Alois