Nation projector carbons (1935)

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00018
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
May 30, 2024
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National Projector Carbons required diameter. For carbons that are to be cored these rods are formed with a central opening into which the core material is inserted at a later stage of production. The extruded product is then allowed to Figure 6 Hydraulic Extrusion Pre* cool. When cool, these "green" carbon rods are fairly rigid but, in reality, are still in plastic form. Before they can be used, they must be baked at a high temperature wThich converts the pitch bonding agent into coke, leaving a homogeneous solid of pure carbon. Preparatory to baking, the green carbons are packed in a specially designed, gas fired furnace where they are subjected to a very high temperature. The time-temperature cycle of the baking operation is of great importance and is carefully controlled within close limits throughout the baking period. A typical furnace room is shown in Figure 7. When the carbons come from the furnace, they are leaned, cut to the required length, and inspected for straightness and visible faults, after which the core material is forced into those carbons which are manufactured in hollow form. These carbons are again baked to solidify the core material. Next, the carbons 14