Regardless a vacuum can only apply a force of < 15 pounds per square inch where as with a roller or even a small iron (I use a sealing iron normally used on heat shrink model airplane covering film) you can apply a much greater pressure per area.
Heat sealing irons have an adjustable thermostat and I usually set it as hot as possible.
I use staples paper and got a perfect doublesided 8052 single board computer (8 - 9 chips) first try. Printer was an Okidata 10E and have used a Panasonic KX-P4440 with same results.
Hugh
----- Original Message -----
From: Earl T. Hackett, Jr.
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, October 19, 2004 10:13 PM
Subject: Re: [Homebrew_PCBs] Re: Questions about toner transfer method. Deep Fried
Precisely correct. On a 4" x 6" board that comes to 360 pounds. I only weigh 200.
----- Original Message -----
From: Hugh Prescott
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, October 19, 2004 9:38 PM
Subject: Re: [Homebrew_PCBs] Re: Questions about toner transfer method. Deep Fried
Dumb question probably but isn't the max presure (full space vacum) just equal to 15 psi relative to sea level.
So if you could deep space max vacum the inside of the bag the max applied pressure would be only 14.7 - 15 psi applied to the bag.
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Re: [Homebrew_PCBs] Re: Questions about toner transfer method. Deep Fried
2004-10-20 by Hugh Prescott