Graphite plate is a graphite product obtained by rolling graphite
After chemical treatment, water washing and high-temperature expansion of graphite, a flexible and loose graphite material was obtained. This is not the ultimate goal. The ultimate goal is to produce products of various uses, such as graphite paper foilGraphite plateGraphite tube, graphite trough, graphite holder, etc. This requires a molding process, which uses mechanical methods to process products of various specifications, shapes and sizes. Xiaobian will talk about the rolling method
Rolling forming method
It is mainly used to press flexible graphite paper foil or plate. It is divided into single-layer flat plate continuous rolling and multi-layer flat plate continuous rolling.
(3) single layer flat plate continuous rolling method
This rolling method can press flexible graphite into plate without any binder. The whole process is carried out on the special equipment equipped with roller compactor. It is the structural schematic diagram of single-layer flat plate rolling equipment. Machine structure composition: hopper for worm graphite), vibrating feeding device 2, conveyor belt, four pressure rollers, heater pair (, roller for controlling plate thickness, embossing or pattern roller 1, composite pressing roller and roller, cutting knife finished product roll.
Working process: expanded graphite from hopper
Enters the feeding device 2 and lands on the conveyor belt. The material layer with a certain thickness is formed after being rolled by the pressure roller. Heating device (generating high-temperature heating to remove residual liquid in the material layer and make unexpanded graphite
This is the last expansion. And then the preliminarily formed reverse material is sent to a roller with a controlled thickness.
Multi layer plate rolling method
Single layer plate rolling, althoughGraphite anode plateFlat and smooth, but not too thick. When one-time forming is too thick, its uniformity and density are difficult to ensure. In order to make thick plates, multi-layer composite plates are pressed by stacking multi-layer single plates. The adhesive shall be added between each two layers and then rolled and formed. After forming, heat treatment is required to carbonize and harden the adhesive. The multi-layer plate rolling method is carried out on a multi-layer continuous roller. It is the structural schematic diagram of the multi-layer continuous flat plate mill.
- rack; - Veneer winding roll; (- three layer integrated board;) - Adhesive box; - Adhesive tank;
- adhesive coating roller; - Synthetic roller;! (- heater) - thickness control roll;
- adjusting roller clearance hand wheel; - Roasting unit - final pressure roller
Working process of multi-layer continuous plate mill:
The veneer drawn from the veneer winding roll passes through the adhesive coating roll
The first new process and technology of graphite production after coating both sides with adhesive, it is combined with the single plate wound around the roller to form a three in one thick plate, which is rolled to a certain thickness in the gap between the rollers. And then sent to the heater for heating and drying.
Adjust the thickness to the specified size through the thickness control roller, and then send it to the roasting device for roasting. After the adhesive is carbonized, it is finally pressed by a pressure roller. There are usually two types of adhesives used
Two cases:
(1) Synthesize plates with high heat resistance, and select inorganic binders such as silicate aqueous solution, colloidal alumina, colloidal silica and monovalent aluminum phosphate aqueous solution;
(2) Organic binders such as phenol based resins are often used for plates with low requirements for heat resistance. Multi layer continuous roller, capable of pressing;
(3) thick flexible graphite plate, which is superior to single-layer roller. But because
Graphite plateThick also brings the disadvantage of delamination and peeling of the plate, which brings trouble to use. The reason for this is that the gas escapes in the middle of the interlayer during pressing, which hinders the close bonding between the layers. The way to improve is to solve the problem of exhaust gas in the pressing process.
