Re: Tacky attraction
yet another thought: So the polymer is placed under a vacuum. It is entirely possible that doing that actually pulls air out of the polymer itself, causing the air pockets under the ohp. The stuff is water soluble, and not rigid, so I would BET that it is porous and contains air and water = vapor. solution: place the plate alone, under vacuum (no light), for a couple of minutes prior to exposure to evacuate any air that wants to leave, THEN do the positive exposure. who knows... maybe, maybe not. (In fact, the heat of a longer exposure might even exacerbate such a phenomenon.) susan On 2/28/07, SusanV <susanvoss3@gmail.com> wrote: ::::::::: smacking self in forehead ::::::::::: susan On 2/28/07, taylordow <taylordow@sprintmail.com> wrote: > Susan, > > Trim the film! I cut mine so that I have just the image - not even a > clear border. If I don't trim it down to less than the plate size, I > always get contact problems. > > Keith. > > > On Feb 28, 2007, at 12:09 PM, SusanV wrote: > > Hello, > > Another day, another idea... I haven't been cutting my positive films > to match the outside edge of my plates. I've just been letting the > excess hang off all around the edges. That "hangover" gets pulled > down by the vacuum pressure, probably creating a tight fit along the > perimeter of the plate, further hampering the attempted exit of > terrified air molecules. > > The little test strip I tried yesterday didn't measle. The ohp film > was actually a little smaller than the plate. > > note to self: trim those films. > > susan > > -- susan gravure blog at www.susanvossgravures.blogspot.com website www.dalyvoss.com -- susan gravure blog at www.susanvossgravures.blogspot.com website www.dalyvoss.com
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