8mm Forum: Striping questions

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Posted by John Whittle (Member # 22) on March 18, 2004, 08:26 PM:

Some comments about stripe problems brought this to mind.

Is it as it seems, impossible to dispersion (wet) stripe estar film? It would seem so since the chemicals in the normal dispersion formula act like film cement to make the stripe stick to the base. Emulsion striping has always been problematic with humidity changes the stripe would crack and peel. But what about magnetic tape which is mylar base? Isn't that close to the estar base of motion picture film?

But what about the laminated stripe? At one time Agfa (and perhaps others) sold a stripe material that was magnetic stripe coated onto a support and then a thermoplastic material on top. On the striping machine, heat and pressure would stick the stripe to the film and then the acetate backing would be pulled off.

And who is doing the striping and how could they miss gaps in the application of the dispersion material? Are the prints striped by a lab or by an individual working at home?

As long as we're on the subject, how are the new prints (of German origin?) made? Are they COR (continous optical reduction) from a 16mm internegative? The common COR printers in labs in the 70s were either 16mm printing two up Super8 in one pass or 35mm printing four up Super8 in one pass. The film was recorded before it was slit. It was inspected in it's wider width and then slit as the finishing operation.

While it would be possible to contact print Super8 from a Super8 internegative the quality would suffer greatly.

Just wondering if anyone knows any of the technical specs on the outfit making the "new prints".

John

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