Laser Heat

why laser print image not transfer to stainless steel net but easily transfer to copper board by heat transfe?

why laser print image not transfer to stainless steel net but easily transfer to copper board by heat transfer
even the steel net is very fine like silk cloth.
i want to know what actually happen during toner transfer by heat
plz. reply

The first answer I would give is cleanliness – it is easy to clean the surface of a copper board of all oils, but I would think harder to move to SS fabric.
If equally clean (alcohol, etc.)
then I would look to the surface quality. The surface of the fabric consists of minute bumps of the wires crossing each other. The laser print image is made of minute pieces of plastic bonded to the paper and each other by heat.
When heat is applied to the back of the paper, the plastic is softened.
On the copper, apparently an excellent bond is formed – enough to pull the plastic off the paper.
On the SS fabric, the bond between the raised round wire bumps is apparently not strong enough to pull the plastic free of its bond to itself and the paper.
Also a possible factor might be that some kinds of SS are very low in heat conductivity and some are high. It may be that when applying heat, the fabric is not getting overall hot enough to transfer the image, since copper is a high conductivity material, I would guess if this is the problem you have low conductivity SS. This can be tested by putting your finger on the SS fabric laying on your work surface and bringing the iron closer to the finger. When I test SS tubing scrap for making glassblowing tools, the low C steel allows me to move a torch a couple of inches away without much heat rise on the metal, while hi C almost instantly makes the fingers hot.
It may also be that it is the fabric weave. Here I am thinking of the screening used around open flames in an explosive gas tester in mines (seen at museum) where the gas lights up around the flame but can’t ignite the gas in the room/mine because the screen conducts the heat away too quickly.

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