Modern Uses

As copying technology advanced, Thermofax machines were subsequently marketed as a method of producing transparencies (viewgraphs) for overhead projector presentations. A sheet of heat-sensitive clear stock was placed on top of the original, and passed through a ThermoFax, producing a black image on the clear stock. This application saw a common usage well into the 1980s, and specialized uses thereafter.

As of 2009, Thermofax machines were still widely used by artists. In addition to making copies, Thermofax machines can be used to make a "spirit master" for spirit duplicator machines. Tattoo artists use these spirit masters as tattoo stencils, to quickly and accurately mark the outlines of a tattoo on the skin of the person to be tattooed using a transfer solution. Textile and Printmaking artists use these machines for creating silk screens in several seconds by running a piece of Riso film through with a photocopied image.

Riso film is a Japanese silk screen product composed of a Saran-type plastic that has been bonded to a screen mesh of various sizes. When the Riso film is exposed to the infrared bulb inside the machine, the saran plastic emulsion side opens up wherever there is an ink toner on the photocopy. Paint and other mediums can then be screened once the film is mounted on a frame. The imaging barrel inside the Thermofax is 8.5" wide, but the film can be of any length. These modern uses have kept up the demand for most of the models of Thermofax machines.

Model 45EGA which was manufactured with an electrical problem that requires a conversion kit to be installed for safe use of the machine. The 45EGA models that were not converted, are still considered to be fire hazards.

Thermofax and Models

Thermo-Fax (very often Thermo fax^[1]) is 3M's trademarked name for a photocopying technology which was introduced in 1950.^[2][3] It was a form of thermographic printing and an example of a dry silver process.^[4] It was a significant advance as no chemicals were required, other than those contained in the copy paper itself. A thin sheet of heat sensitive copy paper was placed on the original document to be copied, and exposed to infrared energy. Wherever the image on the original paper contained carbon, the image absorbed the infrared energy when heated. The heated image then transferred the heat to the heat sensitive paper producing a blackened copy image of the original.

Model 12

The first commercially available Thermofax machine was the Model 12. The 'layup' of the original and the copy paper was placed on a stationary glass platen and an infrared lamp and reflector assembly moved beneath the glass, radiating upwards. The layup was held in position by a lid with an inflatable rubber bladder that was latched down by the user.

Model 17

In subsequent versions, beginning with the Model 17, the layup was fed into a slot, and continuously exposed as it passed the lamp and reflector. The Model 17 and successors were table-top machines, approximately the size of a typewriter from the same era.

Q system

A variation of this technology was a billing system called the Q System, which was typically used by medical and dental offices. A 'master' composed of a sheet of heavy backing paper and a thin sheet of ruled paper attached to it at the top edge was created for each patient. Billing entries were then made in pencil on the thin sheet for each patient visit. To create a billing copy, a sheet of heat sensitive paper was inserted between the backing and the entry sheet and passed through the ThermoFax machine,a Model 47being the most commonly used.