WestbankKurt
New Member
Which is better for car application: calendered or cast?
Thank you
Thank you
Thank for the quick response. Why is cast the better vinyl then calendered?
And your in the sign business?
CAST is manufactured by pouring the liquid vinyl to its finished size and allowing it to cure accordingly. CALENDARED is manufactured by pouring the liquid to a specific size, curing, and then "stretching" the product to its finished size. The stretching gives the vinyl a memory; therefore, over time, the applied vinyl will "shrink" back to its pre-stretched size.
And your in the sign business?
It was explained to me by a VP at the old Fasson (now Avery) ...
Calendared vinyl starts out as a dough and is either extruded through a thin slot with pressure or rolled into a sheet using steel rollers. Either way the molecular memory of the film is that of a lump and it will want to shrink back into a lump when exposed to heat or as it ages. All that stops it from doing so is the adhesive.
Cast vinyl is liquified and then sprayed like paint against a "casting sheet" where it dries or cures and is left with the molecular memory of the sheet it dried as. Therefore, it has no tendency to shrink as it ages.
Cast vinyl is inherently more expensive to produce but it is also inherently superior for long term outdoor vinyl lettering and graphics.
similar, but what i always understood, and told by a gregory rep probably 15 years ago, that cast starts as a liquid and is poured onto massive sheets and baked to cure, while calendared starts as almost like a "playdough" or putty and rolled through different pinch rollers to squeeze it down to the thin shape
cast is stretchy and does not have a memory because it started as a liquid and has no reference point while calendared will always try to ball back up to its original "playdough" state, causing the curling and the shrinking.....