Splice (film technology)

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Magnetic film with splice

Splice is the generic term for film connections . A distinction is made between glue points and weld seams .

There are two different methods for making glued joints: if they are made with film putty , we speak of wet gluing (or wet gluing). On the other hand, there are the so-called dry gluing points (or dry gluing) with self-adhesive tape. These two methods are common in the cinema and amateur film sectors. Dry gluing is gentler on the material, since for wet gluing the film parts to be connected are connected to one another in a permanently overlapping manner, which is why some images are unavoidable when such a connection is broken.

Each method has its own devices that are used to ensure that the film sections are precisely aligned with one another, in particular that the hole spacing over the splice is maintained. These include the film scraper, the film plane, the non-cutting film splitter, the gluing press , the butt gluing jig and the heated, quick -release gluing press .

Weld seams, on the other hand, are the result of the connection of polyester film with the help of ultrasonic or heat welding devices, as is usually done in the copier when exposing film copies when two rolls of raw film are joined together. Splices should always coincide with the line of the picture , but the welding of raw film rolls often leads to weld seams that are visible in the picture.

Poorly made splices are often the cause of film tears and derailments in the projector and copier, as the film cannot be guided safely at these points.

The international standards ISO 6038 apply for splices in the film formats 70, 65, 35 and 16 mm and 3642 for splices in Super 8 film.