Patent Application
20150104661
1. Field of the Invention
The present invention relates generally to a manufacturing method of artificial graphite sheet and a product thereof. The artificial graphite sheet manufactured by means of the manufacturing method has better ductility and malleability than the conventional artificial graphite sheet. Moreover, the artificial graphite sheet of the present invention can be rolled up to minimize the occupied space and facilitate transfer and delivery.
2. Description of the Related Art
It is known that artificial graphite substrate is applied to a heat source, a chip, an LED, etc. for conducting heat or dissipating heat. For example, a prior art discloses an artificial graphite heat dissipation substrate. In an environment of inert gas, a polyimide membrane is heated and carbonized into a graphite membrane, which is a laminated graphene collection with a thickness ranging from about 0.01 mm to 0.04 mm. Then, multiple layers of graphite membranes are thermally laminated in a laminating direction into the artificial graphite heat dissipation substrate with a thickness of about 50 mm.
In some other conventional techniques, chemical vapor deposition or high-temperature heating method is used to carbonize and graphitize a mixture of polymer solution and graphite to achieve a graphite membrane.
In the conventional manufacturing method of the artificial graphite substrate, multiple layers of graphite membranes are heated at about 1800° C.˜3000° C. and laminated to form the graphite substrate. The heating time is about 1.5 hours˜3 hours for completing the manufacturing of the graphite substrate. The manufacturing process is complicated and time-consuming. Moreover, for performing the high-temperature heating process, the cost for the equipment is increased.
Also, in general, the artificial graphite substrate is cast into a block for assembling with a heat source to conduct heat or dissipate heat. However, as known by those who are skilled in this field, in mechanical property, the conventional artificial graphite substrate is hard and crackly and is subject to breakage. Therefore, the conventional artificial graphite substrate cannot be freely flexed in accordance with the configuration of the heat source. As a result, the application range is limited. This is not what we expect.
It is therefore tried by the applicant to provide a manufacturing method of artificial graphite sheet and a product thereof. The artificial graphite sheet manufactured by means of the manufacturing method has better ductility and malleability than the conventional artificial graphite sheet. Accordingly, the artificial graphite sheet can be assembled and used in accordance with the configuration of the heat source. Moreover, the artificial graphite sheet can be bent to a greater extent and rolled up to minimize the occupied space and facilitate transfer and delivery. The conventional manufacturing method of the graphite substrate is complicated and time-consuming. Moreover, for performing the high-temperature heating process, the cost for the equipment is increased. In contrast, the manufacturing equipment and process of the artificial graphite sheet of the present invention are simplified and the manufacturing time is shortened.
It is therefore a primary object of the present invention to provide a manufacturing method of artificial graphite sheet and a product thereof. The artificial graphite sheet manufactured by means of the manufacturing method can be bent to a greater extent and rolled up to minimize the occupied space and facilitate transfer and delivery.
To achieve the above and other objects, the manufacturing method of the artificial graphite sheet includes steps of: selecting graphite powder (granules) and polymer (such as linear low-density polyethylene) and mixing the graphite powder with polymer; heating, compounding and homogenizing the mixture to form a graphite (mixture) subassembly with a basic thickness; calendering the graphite subassembly to form a graphite (mixture) sheet assembly with a purposed thickness; thermostatically (or heat insulation) maturing the graphite sheet assembly and gradually cooling the graphite sheet assembly to room temperature to form a flexible sheet body; and rolling up the flexible sheet body into a roll form with a rolling apparatus. The conventional manufacturing method of the graphite substrate is complicated and time-consuming. Moreover, for performing the high-temperature heating process, the cost for the equipment is increased. In contrast, the manufacturing equipment and process of the artificial graphite sheet of the present invention are simplified and the manufacturing time is shortened.
In the above manufacturing method of the artificial graphite sheet, a (hot-wind) drier can be used to dry the graphite powder and the linear low-density polymer and remove the water thereof. An additive can be added into the graphite powder and the linear low-density polymer. A (double-threaded-rod) blending machine can be used to blend the mixture of the graphite powder and the polymer and the additive so as to form the graphite subassembly. The additive is selected from a group consisting of flexibilizer, modifier and the likes including polymer plastic material, epoxy, styrene copolymer, thermoplastic plastic or the like.
In the above manufacturing method of the artificial graphite sheet, before rolling up the graphite sheet assembly or the flexible sheet body, at least one surface of the graphite sheet assembly or the flexible sheet body is coated with an isolation material layer for avoiding adhesion of the roll of graphite sheet.
The artificial graphite sheet manufactured by means of the manufacturing method of the artificial graphite sheet is a flexible sheet body formed of the mixture of the graphite powder, the polymer and/or the additive. The artificial graphite sheet has better ductility and malleability than the conventional artificial graphite sheet and can be bent to a greater extent.
The present invention can be best understood through the following description and accompanying drawings, wherein:
Please refer to
As shown in
The manufacturing method of the artificial graphite sheet of the present invention further includes a step (b) of compounding and homogenizing, a double-threaded-rod blending machine being used to blend the mixture of the graphite powder 10 and the polymer 20 and/or the additive 30 so as to form a graphite (mixture) subassembly with a preliminary or basic thickness.
In this embodiment, in step (b) of compounding and homogenizing, the mixture is heated to enhance the operation effect.
As shown in
Please now refer to
In a preferred embodiment, the graphite sheet assembly can be rolled up into a roll form by means of a rolling apparatus. Accordingly, the manufacturing method of the artificial graphite sheet of the present invention further includes a step (e) of rolling as shown in
In this embodiment, before step (e) of rolling, at least one surface of the graphite sheet assembly is coated with an isolation (material) layer 40 for avoiding adhesion of the roll of graphite sheet. The material of the isolation layer 40 can be PE or the like material.
The manufacturing method of the artificial graphite sheet and the product of the manufacturing method of the present invention are applicable to heat conduction or heat dissipation and have the following advantages:
In conclusion, the manufacturing method of the artificial graphite sheet and the product of the manufacturing method of the present invention are different from and advantageous over the conventional techniques.
The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102137213 | Oct 2013 | TW | national |
