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    Graphite rolling molding process

    2019-11-22 11:32:01
    Times

    Graphite rolling molding method: mainly used to press graphite sheets paper foils, divided into single-layer flat continuous rolling multi-layer flat continuous rolling

    1. Single-layer flat continuous rolling method

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    This rolling method can press flexible graphite into a sheet without any binder. The whole process is carried out on special equipment equipped with roller compactors.

    The structure of the roller compactor: (1) a hopper with vermicular graphite (2) a vibrating feeding device (3) a conveyor belt (4) four pressure rollers (5) a pair of heaters (6) a roller that controls the thickness of the plate ( 7) Embossing pattern roll (8) roll (9) cutting knife (10) finished roll

    Working process: High purity graphite enters the feeding device the hopper falls on the conveyor belt. After being rolled by the pressure roller, a material layer with a certain thickness is formed. The heating device generates high-temperature heating to remove the residual gas in the material layer expand the unexpanded graphite for the last time. Then the preliminarily formed counter material is sent to a roller with a controlled thickness size, pressed again according to the specified size to obtain a flat board with uniform thickness a certain density. Finally, after being cut by a cutter, the finished tube is rolled.

    2. Single-layer flat plate rolling method

    Single-layer flat plate rolling, although the pressing plate is flat smooth, it should be too thick. When the one-time molding is too thick, its uniformity density are difficult to guarantee. In order to make a thick board, a multi-layer single board is used to stack press into a multilayer composite board. Binder is added between every two layers then rolled into shape. After molding, heat treatment is required to carbonize harden the binder. The multi-layer flat plate rolling method is carried out on a multi-layer continuous rolling machine.

    The working process of the multi-layer continuous roller compactor: the veneer is led out the veneer by winding the roller, the adhesive is applied to the soil on both sides through the adhesive coating roller, it is combined with the winding roller the veneer to become a Sanhe thick plate. The gap is rolled to a certain thickness. Then send it into the heater to heat dry. Through the thickness control roller, the thickness is adjusted to the specified size, then sent to the roasting device for roasting. When the binder is carbonized, it is finally formed by pressing with a pressure roller.

    The continuous rolling grade used can compress flexible graphite sheets with a thickness of 0.6~2mm, which is better than a single-layer rolling machine, but due to the thickness of the sheet, it will also bring the disadvantage of delamination peeling of the sheet, which brings trouble to use. The reason is that the gas overflows stays in the middle of the interlayer during pressing, which prevents the close bonding between the layers. The way to improve is to solve the exhaust problem during the pressing process.

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