CN217257584U - Short fiber orientation equipment - Google Patents
Short fiber orientation equipment Download PDFInfo
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- CN217257584U CN217257584U CN202220591144.9U CN202220591144U CN217257584U CN 217257584 U CN217257584 U CN 217257584U CN 202220591144 U CN202220591144 U CN 202220591144U CN 217257584 U CN217257584 U CN 217257584U
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Abstract
The utility model relates to a heat conduction silica gel manufacture equipment technical field especially relates to a directional equipment of short-staple, including the material pipe, switching pipe and the discharging pipe that connect gradually, the cross-sectional area of switching pipe is from last down reducing gradually, the material pipe with link up between the switching pipe have the screen cloth or the switching pipe with link up between the discharging pipe has the screen cloth. The utility model provides an ingenious use screen cloth structure and toper switching pipe of short-staple orientation equipment has improved short-staple orientation arrangement effect in the silica gel mixture, and the orientation rate is high, has improved the heat conductivity of thermal gasket, has also improved the point and has glued speed. The utility model discloses a short-staple orientation equipment has simple structure, convenient operation, and directional effectual, the advantage of production effect is fit for promoting.
Description
Technical Field
The utility model relates to a heat conduction silica gel manufacture equipment technical field especially relates to a short-staple orientation equipment.
Background
Since the performance of the electronic component is degraded or damaged by overheating, cooling of the electronic component is an important issue. A heat conductive interface material used between a heat generating body and a heat radiating body is often required to have excellent heat conductive properties.
At present, the main heat conduction material is filling type heat conduction material, and the filling type heat conduction material fills high heat conduction and high insulation filler into a high polymer material matrix to form a heat conduction network inside the high polymer material matrix, so that the heat conduction performance of the composite material is improved. Carbon fiber has the advantages of small density, excellent mechanical property, small thermal expansion coefficient, good heat conduction and electric conduction, anisotropy, high temperature resistance, fatigue resistance and the like, and is widely applied to the high-tech fields of aerospace, national defense, military industry, civil industry and the like. The carbon fiber is an anisotropic material, has ultrahigh thermal conductivity in the axial direction, can reach 600-plus 1300W/(m.K), and can remarkably improve the thermal conductivity of the silica gel under a smaller filling amount after the carbon fiber is orderly arranged in the silica gel, and simultaneously keeps good mechanical and mechanical properties of the silica gel.
Anisotropic materials tend to align naturally along the direction of fluid flow, an effect which has been widely reported and utilized by many researchers. The devices for controlling the orientation of the anisotropic filler are mainly extrusion equipment, injection molding equipment, and molding equipment. In the material obtained by these methods, the anisotropic fillers are aligned in the planar direction, and are difficult to align in the perpendicular direction.
The existing orientation equipment of the short fiber heat-conducting gasket is a cylindrical or square extrusion die, carbon fibers are oriented along the extrusion direction through pressure extrusion, the larger the cross section of a discharge port is, the poorer the orientation effect is, the lower the heat conductivity coefficient of the short fiber heat-conducting gasket is, and the size of the discharge port is limited (the cross section of the general discharge port is lower than 100 mm) 2 ) The directional efficiency is also limited.
The invention patent of publication No. CN103975429A realizes the qualitative arrangement of carbon fibers by using an extrusion method, in which the extruded strip-shaped composites are arranged, and because the columnar composites have certain fluidity before solidification, they cannot maintain a fixed columnar shape during stacking, and there will be uneven portions in the block, and during the pressing process, redundant interfaces will appear due to too many independent columnar composites, which will affect the compactness of the formed gasket.
SUMMERY OF THE UTILITY MODEL
In view of this, the technical problem to be solved by the present invention is to provide a directional device mechanism for improving the directional efficiency and the orientation effect of short fibers.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a directional equipment of short-staple, including the material pipe, switching pipe and the discharging pipe that connect gradually, the cross-sectional area of switching pipe is from last down reducing gradually, material pipe with link up between the switching pipe have the screen cloth or the switching pipe with link up between the discharging pipe has the screen cloth.
Preferably, the internal diameter of the tapping pipe is 5 to 15 mm.
Preferably, the taper ratio of the adapter tube is 1.2-1.6.
Preferably, the wire diameter of the screen is 0.2-0.8 mm.
Preferably, the shape of the holes of the screen is one of square, diamond, hexagon and octagon.
Preferably, the side length of the holes of the screen is 3-6 mm.
Preferably, the shape of the holes of the screen is a circle with a diameter of 3-6 mm.
Preferably, the material of the screen is one of metal, ceramic and composite material.
Preferably, the screen is a steel mesh.
The utility model provides an ingenious use screen cloth structure and the toper switching pipe of short-staple orientation equipment has improved short-staple orientation arrangement effect in the silica gel mixture, and the orientation rate is high, has improved thermal conductivity of thermal gasket, has also improved the point and has glued speed. The utility model discloses a short-staple orientation equipment has simple structure, convenient operation, and directional effectual, the advantage of production effect is fit for promoting.
Drawings
Fig. 1 is a schematic structural view of a short fiber orientation apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a short fiber orientation apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic view showing the shape of a screen in the short fiber orienting apparatus according to an embodiment;
FIG. 4 is a schematic view of the shape of a screen in another embodiment of a staple fiber orienting apparatus;
FIG. 5 is a microscopic morphology of the thermally conductive silica gel prepared in example 1;
FIG. 6 is a microscopic morphology of the thermally conductive silica gel prepared in example 4;
FIG. 7 is a microscopic morphology of the thermally conductive silica gel prepared in comparative example 1;
reference numerals: 1-material pipe, 2-adapter pipe, 3-discharge pipe and 4-screen.
Detailed Description
In order to further understand the present invention, the technical solution in the embodiment of the present invention is clearly and completely described with reference to the accompanying drawings, and obviously, the described embodiment is only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person having ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-4, the present embodiment provides a short fiber orientation apparatus, which includes a material pipe 1, an adapter pipe 2 and a material discharging pipe 3 connected in sequence, wherein the cross-sectional area of the adapter pipe 2 decreases gradually from top to bottom, and a screen 4 is connected between the material pipe 1 and the adapter pipe 2 or a screen 4 is connected between the adapter pipe 2 and the material discharging pipe 3.
Specifically, the lower part of the material pipe 1 has the same cross-sectional area, the cross-sectional area of the upper end of the adapter pipe 2 is equal to the cross-sectional area of the lower part of the material pipe 1, and the cross-sectional area of the lower end of the adapter pipe 2 is equal to the cross-sectional area of the upper part of the material pipe 3.
The utility model discloses a short-staple orientation equipment's a use method: the silica gel mixture that will mix the completion is poured into the feed cylinder into, and to the feed cylinder pressure application, the silica gel mixture passes through screen cloth 4, then through switching pipe 2, has increased the curtain coating area of contact, makes the short fiber pre-orientation in advance, extrudes from discharging pipe 3 export, and the short fiber further orientation for directional effect promotes, and the silica gel mixture arranges on slide glass or mould, and the solidification is formed the back, obtains fashioned heat conduction gasket that has the orientation of short fiber.
The utility model discloses a another kind of application method of short-staple orientation equipment: the silica gel mixture that will mix the completion injects the feed cylinder into, applys pressure to the feed cylinder, and the silica gel mixture passes through switching pipe 2, then passes through screen cloth 4, has increased curtain coating area of contact, makes the short fiber pre-orientation in advance, exports from discharging pipe 3 and extrudes, and the short fiber further orientation for directional effect promotes, and the silica gel mixture arranges on slide glass or mould, and the solidification is formed after, obtains fashioned heat conduction gasket that has the short fiber orientation.
The extrusion speed of the silica gel mixture is controlled by adjusting the pressure applied by the charging barrel, the extrusion speed is higher when the pressure is higher, the oriented arrangement of the short fibers is facilitated, and the pressure of the short fiber orienting equipment is adjusted according to the equipment capacity. The thickness of the heat conducting gasket is related to the distance between the outlet of the discharging pipe 3 and a slide glass or a mold and the width of the outlet of the discharging pipe 3, and the thickness is adjusted according to requirements.
In another embodiment, the internal diameter of the tapping pipe 3 is 5 to 15 mm. The inner diameter of the discharge pipe 3 in this example may be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, or the like, but is not limited to the above value.
In another embodiment, the taper ratio of the adapter tube 2 is 1.2-1.6. The taper ratio determines the degree of compression and the orientation time of the material. The taper ratio of the adapter tube 2 in this embodiment may be 1.2, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc., but is not limited to the above values.
In another embodiment, the wire diameter of the screen 4 is 0.2-0.8 mm. The wire diameter of the mesh 4 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc., but is not limited to the above values.
In another embodiment, the shape of the holes of the screen 4 is one of square, diamond, hexagon, and octagon.
In another embodiment, the screen 4 has openings with a side length of 3-6 mm. The side length of the hole may be 3mm, 4mm, 5mm, 6mm, etc., but is not limited to the above values.
In another embodiment, the shape of the holes of the screen 4 is circular with a diameter of 3-6 mm. The diameter may be 3mm, 4mm, 5mm, 6mm, etc., but is not limited to the above values.
In another embodiment, the material of the screen 4 is one of metal, ceramic and composite material.
In another embodiment, the screen 4 is a steel mesh.
The adapter tube 2 and the discharge tube 3 in this embodiment are circular openings, which can ensure uniform stress in all directions. But other shapes (square, triangular, oval, etc.) can also give good carbon fibre orientation.
The technical solution of the present invention is further described with reference to the following specific embodiments.
Example 1
The utility model provides a directional equipment of short fiber, is including the material pipe 1, switching pipe 2 and the discharging pipe 3 that connect gradually, and the cross-sectional area of switching pipe 2 reduces from last down gradually, links up screen cloth 4 between material pipe 1 and the switching pipe 2. The internal diameter of the discharge pipe 3 is 5mm, the taper of the adapter pipe 2 is 1.4, the screen mesh 4 is a steel mesh, the wire diameter is 0.4mm, the hole is square, and the side length is 3 mm. When the heat conducting gasket is prepared, the material pipe 1 is extruded by adopting 0.5MPa air pressure, and the dispensing speed is 10 mL/min.
Example 2
The utility model provides a directional equipment of short fiber, is including the material pipe 1, switching pipe 2 and the discharging pipe 3 that connect gradually, and the cross-sectional area of switching pipe 2 is from last down reducing gradually, links up screen cloth 4 between material pipe 1 and the switching pipe 2. The internal diameter of the discharge pipe 3 is 5mm, the taper ratio of the adapter pipe 2 is 1.4, the screen mesh 4 is a steel mesh, the wire diameter of the steel mesh is 0.2mm, the hole is square, and the side length is 3 mm. When the heat-conducting gasket is prepared, the material pipe 1 is extruded by adopting 0.5MPa of air pressure, and the dispensing speed is 10 mL/min.
Example 3
The utility model provides a directional equipment of short fiber, is including the material pipe 1, switching pipe 2 and the discharging pipe 3 that connect gradually, and the cross-sectional area of switching pipe 2 is from last down reducing gradually, links up screen cloth 4 between switching pipe 2 and the discharging pipe 3. The internal diameter of the discharge pipe 3 is 15mm, the taper ratio of the adapter pipe 2 is 1.2, the screen 4 is a steel mesh, the wire diameter is 0.8mm, the shape of the hole is circular, and the diameter is 6 mm. When the heat-conducting gasket is prepared, the material pipe 1 is extruded by adopting 0.5MPa of air pressure, and the dispensing speed is 40 mL/min.
Example 4
The utility model provides a directional equipment of short fiber, is including the material pipe 1, switching pipe 2 and the discharging pipe 3 that connect gradually, and the cross-sectional area of switching pipe 2 is from last down reducing gradually, links up screen cloth 4 between material pipe 1 and the switching pipe 2. The inner diameter of the discharge pipe 3 is 12mm, the taper ratio of the adapter pipe 2 is 1.4, the screen mesh 4 is a steel mesh, the wire diameter of the steel mesh is 0.4mm, the hole is square, and the side length of the hole is 3 mm. When the heat-conducting gasket is prepared, the material pipe 1 is extruded by adopting 0.5MPa of air pressure, and the dispensing speed is 30 mL/min.
Comparative example 1
The preparation method is the same as that of the example 1, and the equipment is different from the example 1 in that: there is not the screen cloth between material pipe 1 and the switching pipe 2.
The thermal conductivity of the thermal conductive pads of examples 1 to 4 and comparative example 1 were each tested according to the method of ASTM D5470. The test results for the specific examples and comparative examples are given in table 1 below:
TABLE 1 test results of examples and comparative examples
| Item | Thermal conductivity (W/(m.k)) |
| Example 1 | 20.1 |
| Example 2 | 20.0 |
| Example 3 | 15.8 |
| Example 4 | 16.2 |
| Comparative example 1 | 14.9 |
From the test results of example 1 and comparative example 1, the thermal conductivity coefficient is improved by 34.9% under the same dispensing speed; from the test results of example 3 and comparative example 1, it can be seen that the dispensing speed is 3 times faster without decreasing the thermal conductivity (6% improvement).
FIG. 5 is a microscopic morphology of the thermally conductive silica gel prepared in example 1; FIG. 6 is a microscopic morphology of the thermally conductive silica gel prepared in example 4; fig. 7 is a microscopic morphology of the thermally conductive silica gel prepared in comparative example 1. As can be seen from the above figures, the orientation and orientation effect of the short fibers in the thermal conductive pad prepared in example 1 is the best, the orientation and orientation effect of the short fibers in the thermal conductive pad prepared in example 4 is slightly inferior, and the orientation and orientation effect of the short fibers in the thermal conductive pad prepared in comparative example 1 is inferior.
Through the above embodiment and the comparative example, it can be confirmed that the orientation speed and the orientation effect of the short fiber heat-conducting gasket prepared by using the short fiber orientation equipment of the technical scheme are obviously improved, the heat conductivity coefficient and the dispensing speed are obviously improved, the productivity is improved, and the production and manufacturing cost is reduced.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The short fiber orientation equipment is characterized by comprising a material pipe, a switching pipe and a material pipe which are sequentially connected, wherein the cross-sectional area of the switching pipe is gradually reduced from top to bottom, and a screen mesh is connected between the material pipe and the switching pipe or between the switching pipe and the material pipe.
2. Short fiber orientation apparatus according to claim 1, characterized in that the internal diameter of the tapping pipe is 5-15 mm.
3. Short fiber orientation device according to claim 1, characterized in that the taper ratio of the adapter tube is 1.2-1.6.
4. Short fiber orientation apparatus according to claim 1, characterized in that the wire diameter of the screen is 0.2-0.8 mm.
5. Short fiber orientation apparatus according to claim 1, wherein the shape of the holes of the screen is one of square, diamond, hexagon, octagon.
6. Short fiber orientation apparatus according to claim 5, characterized in that the side length of the screen holes is 3-6 mm.
7. Short fiber orientation apparatus according to claim 1, characterized in that the shape of the screen holes is circular with a diameter of 3-6 mm.
8. Short fiber orientation apparatus according to any of claims 1-7, wherein the screen is made of one of metal, ceramic, composite material.
9. Short fiber orientation apparatus according to claim 8, wherein the screen is a steel mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220591144.9U CN217257584U (en) | 2022-03-18 | 2022-03-18 | Short fiber orientation equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220591144.9U CN217257584U (en) | 2022-03-18 | 2022-03-18 | Short fiber orientation equipment |
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| CN217257584U true CN217257584U (en) | 2022-08-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115972465A (en) * | 2022-11-27 | 2023-04-18 | 西北工业大学 | Device and method for preparing flat-plate-shaped prefabricated body with unidirectional short fiber distribution |
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- 2022-03-18 CN CN202220591144.9U patent/CN217257584U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115972465A (en) * | 2022-11-27 | 2023-04-18 | 西北工业大学 | Device and method for preparing flat-plate-shaped prefabricated body with unidirectional short fiber distribution |
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