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The lens hood needs to be flat.

Release Date:

2021-06-30 09:38

Source:

　　When SOMA/KIMOTO materials of various models are rolled up after coating, the outer surface experiences tensile stress, while the inner surface is subjected to compressive stress, leading to varying degrees of curling. In certain engineering applications—such as shutters used in DSC/CCTV systems—this curling can be unacceptable. Please provide a material‑flattening method for our customers’ reference.

　　When the material is in sheet form

　　1. Place the curled portion of the material face-down on a flat surface, and heat it with a hot-air dryer to 40–60°C for 1–3 days. For thin materials such as 25XS1B/25X1BST, use a lower temperature of around 40°C; for thicker materials, use a higher temperature.

　　Heat to approximately 65 degrees.

　　2. For materials that are severely curled, turn the curled portion outward, roll them onto a 6-inch‑diameter paper tube, and heat for 30 minutes at a temperature of 80°C. In such cases, it is best to use approximately 50 sheets.

　　When the material is in roll form

　　The entire roll material is heated using a hot-air dryer for several hours to 24 hours; thin materials such as 25 and 38 are heated at 30–40°C.

　　For 75‑ and 188‑grade thick materials, heat to 50–60°C. Unlike sheet material, coil stock can deform if subjected to high temperatures, so temperature control must be carefully maintained.

　　Do not subject the above‑mentioned materials to prolonged high‑temperature heating. After heating is complete, allow them to cool slowly inside the furnace before removing them; this is known as furnace cooling. If rapid cooling is employed, the corrective effect against warping will be lost, and the material may instead develop a wavy, undulating shape.

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