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wikisignpedia officially launches in Beta Version

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Over 426 sign wiki's now submitted.

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wiki updated due to glitch in post count. This glitch has now been rectified.

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Wikisignpedia has now been launched in beta-version to 15 trustee members of UKSB only.

We would like to encourage members to contribute as much as possible. Particularly on information based on their geographical location.

Thank you…

Robert Lambie

 

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Calendered

Calendered Films Like cast, calendered film also gets its name from the manufacturing process. These films may also be referred to as intermediate, 4 mil, short-term or economy. Calendered vinyl is formulated with similar raw materials as cast, except that no solvents are used. The batch is mixed and heated to a molten state that resembles pizza dough. Once the film reaches this molten state it is extruded through a die and is then fed through a series of calendering rolls. These polished steel rolls progressively squeeze and stretch the vinyl into a flat sheet (similar to flattening out dough with a rolling pin). Because the film is stretched into shape, it has some degree of memory and therefore is less dimensionally stable than cast vinyl films. This means that when a calendered film is exposed to heat the film will have a tendency to shrink or pull back towards its original form. Calendered films also tend to be thicker (usually 3.2 to 3.4 mils) than cast films because of the limitations of the calendering process. Unlike casting where a textured or smooth casting sheet is used to produce the film finish, calendering implements a special finish cylinder at the end of the process while the film is still warm. This process is extremely fast and is ideal for bulk production runs. Therefore, color matching is very unattractive on these machines. However, due to its bulk production with high yields, calendered films are relatively inexpensive.

The quality of calendered films can range from economy to intermediate with durability of one to five years. These films generally are not recommended for vehicle applications because they are thicker, less conformable and less durable than cast films.

extract: http://www.signindustry.com

 
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