WHY DO THERMAL GRAPHITE SHEETS NEED TO BE EDGED?

Thermal graphite sheet is a kind of high thermal conductivity material which is very popular in recent years due to its high thermal conductivity, low thermal resistance and light weight. Graphite can conduct uniform heat conduction in two directions, thus achieving rapid thermal diffusion, shielding heat sources and components and improve the performance of consumer electronics. At present, according to the performance characteristics, it can be divided into two types: synthetic heat conductive graphite film and natural heat conductive graphite paper. At present, the main application fields of thermal graphite sheets: IC, MOS, LCD-TV, notebook computers, communication equipment, wireless switches, routers, smart phones and other industries.

Because graphite sheets are characterized by easy breakage and poor toughness, thermal graphite sheets need to be processed in the process of applying heat-conducting materials. The current main processing methods include:

1, adhesive processing

Mainly in order to better adhere to the IC and electronic component circuit board, it needs to be back-coated on the surface of the thermal graphite sheet, which can be divided into two types: double-sided adhesive and single-sided adhesive.

2, film processing

Because some electronic products require insulation and insulation in the circuit design, and the thermal graphite sheet itself is electrically conductive, it is necessary to carry out lamination processing on the surface of the thermal graphite sheet to optimize product performance.

3, edging processing

Graphite die cutting process, the edges of the powder is easy to fall, so the thermal conductivity of graphite sheet during most of the applications are required edging process.

Reasons for the edge treatment of thermally conductive graphite film 

In fact, the reason why the thermal graphite sheets need to be edged is the graphite itself is electrically conductive. Although the insulation effect is achieved after the coating film, the edge of the graphite sheet which is cut (die-cut) when cutting the size specifications of the customer will be the graphite fine powder particles are dropped, and the heat conductive graphite sheet is better adhered to the heat source after being edged, and also prevents the graphite fine powder particles from falling. If the client is used inside the electronic products for thermal conduction, thermal conductivity of graphite film if a small amount off the well does not affect the normal operation of the electronic device, may be processed. However, if there is a lot of falling off, if the graphite fine powder particles are dropped on the electronic components during use, the electronic components may be short-circuited, which may cause damage to the electronic components.

Suzhou Dasen Electronics Material Co., Ltd. realized the process of asynchronous die-cutting operation through technology update. The new heat-conducting graphite sheet edge-wrapping process is operated in comparison with the traditional composite graphite sheet, and the asynchronous die-cutting is performed only on the sheet graphite. When the outer frame is combined with the protective film, the sheet graphite is reduced in the stress of the composite material, so that the graphite of the sheet is more stable, and the punching of the two pieces of graphite time can be avoided, and the graphite piece can be completed according to the punching positioning holes cut rule die cut position, not falling, but also makes more convenient waste discharge. At the same time, it is only necessary to carry out the chasing positioning in the first step, which not only effectively improves the production efficiency, but also greatly improves the product qualification rate.