CN221112593U - Polymer powder hot press device - Google Patents
Polymer powder hot press device Download PDFInfo
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- CN221112593U CN221112593U CN202322425775.0U CN202322425775U CN221112593U CN 221112593 U CN221112593 U CN 221112593U CN 202322425775 U CN202322425775 U CN 202322425775U CN 221112593 U CN221112593 U CN 221112593U
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- 239000000843 powder Substances 0.000 title claims abstract description 59
- 229920000642 polymer Polymers 0.000 title claims abstract description 23
- 238000007731 hot pressing Methods 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000005485 electric heating Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 abstract description 37
- 230000008569 process Effects 0.000 abstract description 35
- 238000010438 heat treatment Methods 0.000 abstract description 26
- 229920001721 polyimide Polymers 0.000 abstract description 16
- 239000004642 Polyimide Substances 0.000 abstract description 14
- 239000002861 polymer material Substances 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 12
- 230000007547 defect Effects 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 9
- 229920006351 engineering plastic Polymers 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000009704 powder extrusion Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model belongs to the technical field of polymer material processing, and discloses a polymer powder hot pressing device, which comprises: the air exhaust hole, the upper cover, the hot-pressing die and the feeding port; the exhaust hole is arranged on the upper cover, the upper cover can be combined with the hot-pressing die, and the feed inlet is arranged on the side surface of the hot-pressing die; the feeding hole is connected with a power supply, the power supply can supply power to the electric heating wire, and the electric heating wire is arranged in the feeding hole and can heat; a cavity is arranged in the hot-pressing die and can contain materials; two cavities are arranged in the upper cover and are communicated with the exhaust holes; ejector pins can be placed in the cavities. The utility model prevents the powder from forming a hard shell layer by directly contacting a high-temperature die by heating the powder in advance, thereby reducing the generation of the hard shell layer. According to the utility model, through designing the die with the exhaust channel, the hot-pressing exhaust efficiency is improved in the hot-pressing process, and the number of holes formed by gas molecules generated by polyimide materials is reduced.
Description
Technical Field
The utility model belongs to the technical field of polymer material processing, and particularly relates to a polymer powder hot pressing device.
Background
In the field of polymer material processing, flat plate hot pressing is a common process method. The method is characterized in that high molecular material powder is placed in a hot die, and high temperature and high pressure are applied to sinter the powder into a compact block material. However, there are problems in this process such as formation of a hard shell layer of powder and poor discharge of gas molecules. The prior art solution is: one of the current solutions is to preheat the powder prior to heating to prevent the powder from suddenly coming into direct contact with the high temperature mold under low temperature conditions to form a crust. This allows the powder to be more uniformly thermalized and sintered, thereby reducing the formation of hard shells. However, there are some problems in the prior art. First, the process of preheating the powder requires additional equipment and time, and the powder is added to the hot pressing equipment after being preheated, reducing process continuity, which increases production costs and process complexity. Secondly, polyimide special engineering plastic materials are subjected to intermolecular polymerization to generate gas molecules in the heating process, but the gas molecules are not good in discharging effect due to lack of a gas discharging channel, so that a large number of holes are formed. These holes can lead to defects and surface irregularities in the polymeric material, which reduces the quality of the product. Therefore, the prior art has some problems and limitations in the hot pressing process of the polymer materials, and needs improvement and optimization. In order to improve the hot pressing and exhausting efficiency, reduce surface defects, and reduce production cost and process complexity, it is necessary to design a new apparatus capable of extruding while heating powder and having an exhausting passage to improve the exhausting efficiency, which will contribute to the improvement of the processing rate and the improvement of the product quality.
Through the above analysis, the problems and defects existing in the prior art are as follows: the process of preheating the powder requires additional equipment and time, reduces the process continuity and increases the production cost and the process complexity; polyimide special engineering plastic materials can generate gas molecules in the heating process, but due to lack of an exhaust channel, the gas molecules can form holes in the material, and the holes can cause structural defects and uneven surfaces of high polymer materials, so that the quality of products is reduced, and the application scene of the materials is limited.
Disclosure of utility model
Aiming at the problems existing in the prior art, the utility model provides a high polymer powder hot pressing device.
The utility model is realized in such a way that a polymer powder hot press device comprises: the air exhaust hole, the upper cover, the hot-pressing die and the feeding port; the exhaust hole is arranged on the upper cover, the upper cover can be combined with the hot-pressing die, and the feed inlet is arranged on the side surface of the hot-pressing die.
Further, the feed inlet is connected with the screw rod, and the electric heating wires are distributed on the feed inlet, so that the power supply can supply power to the electric heating wires and can heat the electric heating wires.
Further, the inside cavity that is provided with of hot pressing mould can hold the material.
Further, two cavities are arranged in the upper cover.
Further, the cavity communicates with the vent.
Further, a thimble can be placed in the cavity.
The implementation mode of the utility model is as follows:
(1) After the thimble is placed, preheating a die and an upper cover;
(2) Extruding high polymer powder through a screw, extruding the high polymer powder into a die through a feed inlet, preheating the high polymer powder in the extruding process of the screw, and heating the high polymer powder at the feed inlet to the hot-pressing temperature;
(3) After the powder extrusion amount reaches a preset amount, covering and mounting the die, and pressurizing for hot pressing;
(4) And after the treatment is finished, demolding is carried out to obtain the high-molecular hot-pressed product.
In combination with the technical scheme 3 and the technical problems to be solved, the technical scheme to be protected has the following advantages and positive effects:
first, the present utility model can effectively prevent the powder from forming a hard shell layer by directly contacting a high temperature mold by performing a preheating treatment before the powder is heated. Thus, the powder can be heated and sintered more uniformly, the generation of hard shell layers is reduced, and the quality of products is improved.
The utility model designs a new device, which can squeeze powder into a die while heating the powder by a screw heating and extruding mode. The design can realize simultaneous heating and extrusion, reduces the processing time and the complexity of equipment, maintains the continuity of the process and reduces the production cost.
The utility model also designs a die which is provided with an exhaust channel, so that the hot-pressing exhaust efficiency can be improved, and gas molecules generated in the hot-pressing process can be smoothly exhausted. Thus, the generation of a large number of holes can be reduced, the defect rate of the product is reduced, and the surface quality and the overall quality of the product are improved. In summary, compared with the prior art, the technical scheme can effectively prevent the formation of the hard shell layer in the hot pressing process, improve the processing rate, reduce the surface defect rate of the product, and simultaneously reduce the production cost and the process complexity. These superiorities make this technical scheme have practicality and economic nature more.
Second, the present utility model prevents the powder from forming a hard shell layer by directly contacting a high temperature mold by heating the powder in advance, thereby reducing the generation of the hard shell layer.
According to the utility model, through designing the die with the exhaust channel, the hot-pressing exhaust efficiency is improved in the hot-pressing process, and the number of holes formed by gas molecules generated by polyimide materials is reduced.
The utility model can heat by the screw and squeeze the powder into the mould at the same time by designing the equipment, thereby realizing simultaneous heating and extrusion, reducing the need of preheating treatment and reducing the production cost and the process complexity.
The utility model can reduce the defects and uneven surface of the high polymer material and improve the product quality by improving the exhaust efficiency and reducing the generation of the hard shell layer.
Thirdly, whether the technical scheme of the utility model solves the technical problems that people want to solve all the time but fail to obtain success all the time is solved: polyimide special engineering plastic materials can generate gas molecules in the heating process, the gas molecules can cause material defects, the common hot pressing equipment cannot be used for producing engineering plastic parts, the application of the special engineering plastic is limited, and the polyimide special engineering plastic materials are often key parts and materials in the high-precision fields of aviation, aerospace, national defense and the like because of the advantages of high temperature resistance, high strength, light weight and the like. Therefore, development of the production process and means for extending and expanding the engineering plastic materials has very practical and strategic significance for the production and application of polyimide special engineering plastic materials.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a polymer powder hot pressing apparatus according to an embodiment of the present utility model;
FIG. 2 is a schematic view of a feed inlet structure according to an embodiment of the present utility model;
FIG. 3 is a schematic view of a hot press mold according to an embodiment of the present utility model;
FIG. 4 is a top view of a hot press mold provided by an embodiment of the present utility model;
FIG. 5 is a bottom view of an upper cover provided by an embodiment of the present utility model;
FIG. 6 is a cross-sectional view of a top cover provided by an embodiment of the present utility model;
FIG. 7 is a schematic diagram of the positions of pins of a polymer powder hot pressing device according to an embodiment of the present utility model;
in the figure: 1. an exhaust hole; 2. an upper cover; 3. hot pressing a die; 4. a feed inlet; 5. an electric heating wire; 6. a power supply; 7. a cavity; 8. and (5) a thimble.
Detailed Description
The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Aiming at the problems existing in the prior art, the utility model provides a high polymer powder hot pressing device, and the utility model is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the polymer powder hot pressing apparatus provided in the embodiment of the present utility model includes: an exhaust hole 1, an upper cover 2, a hot-pressing die 3 and a feed inlet 4; the exhaust hole 1 is arranged on the upper cover 2, the upper cover 2 can be combined with the hot-pressing die 3, and the feeding port 4 is arranged on the side surface of the hot-pressing die 3.
As shown in fig. 2, the feeding port 4 is connected with a power supply 6, the power supply 6 can supply power to the electric heating wire 5, and the electric heating wire is arranged inside the feeding port and can heat.
As shown in fig. 3, a cavity 7 is arranged inside the hot pressing mold 3 and can accommodate materials.
Fig. 4 is a top view of a hot press mold according to an embodiment of the present utility model.
As shown in fig. 5, the upper cover is internally provided with two cavities 7.
As shown in fig. 6, the cavity 7 communicates with the exhaust hole 1.
As shown in fig. 7, a thimble 8 may be placed in the cavity 7.
The following is a description of the detailed working principle of the technical scheme:
And (3) material entering: first, a polymer powder material is fed into the cavity 7 of the hot press die 3 through the feed port 4. The feed inlet 4 is designed on the side surface of the hot pressing die, so that the filling of materials is facilitated.
Preheating: because feed inlet 4 internally mounted has electric heater strip 5 to be connected with power 6, so when the material gets into hot pressing die 3 through feed inlet 4, electric heater strip 5 can carry out preliminary heating to the material, this helps improving hot pressing efficiency and ensures the even heating of material in whole hot pressing process.
Hot pressing: the upper cover 2 is coupled to the hot pressing mold 3 while the exhaust hole 1 is in a closed state. As the temperature increases, the polymer powder begins to soften and compress under pressure into the desired morphology.
And (3) exhausting: as the hot pressing process proceeds, gas may be generated inside the material or some residual gas may need to be exhausted. At this time, the two cavities 7 inside the upper cover 2 are communicated with the exhaust holes 1, so that gas can be rapidly led out, and the shape of the material cannot be influenced due to the pressure generated by the gas in the hot pressing process.
Ejector pin function: in some cases it may be desirable to create certain depressions or special shapes in the hot pressed material, in which case the pins 8 may be placed in the cavities 7. The pins 8 may enter the cavity 7 during the hot pressing process to help form the desired recess or specific shape.
In summary, the polymer powder hot pressing device provided by the embodiment of the utility model can effectively perform hot pressing operation, ensure that polymer powder is uniformly heated in the hot pressing process, and simultaneously can effectively discharge gas through the exhaust hole 1 to ensure the stability of the hot pressing process. In addition, the design of the thimble 8 provides more possibility for hot pressing, and different product requirements can be met.
The embodiment of the utility model adopts the following technical scheme:
1. Heating the powder in advance: in the powder molding process, the powder is preheated to prevent the powder from forming a hard shell layer due to direct contact with a high-temperature die. Preheating may be accomplished by heating the powder to a temperature using a heating device, such as a screw heater.
2. Designing a die with an exhaust passage: in the hot press device, the design mould has the exhaust passage for the gaseous molecule that the macromolecular material heated produced can discharge smoothly, reduces the production of defect and hole. The vent passage may be realized by providing a cavity, passage or hole in the mold, etc.
3. Heated by a screw and simultaneously extruded into a die: the powder is heated by a screw heater and extruded into a die. The screw heater can control the heating and extrusion process by adjusting the temperature and extrusion speed. Therefore, heating and extrusion can be carried out simultaneously, the need of preheating treatment is reduced, and the production cost and the process complexity are reduced.
Example 1: polymer flat plate hot pressing equipment
The embodiment of the utility model provides equipment for hot pressing of a polymer material flat plate, which comprises a heating device, a die and an exhaust channel. The heating device comprises a screw heater for heating the powder in advance. The screw heater controls the heating and extrusion process by adjusting the temperature and extrusion speed. In the powder molding process, the powder is preheated to prevent the powder from forming a hard shell layer due to direct contact with a high-temperature die. Preheating may heat the powder to a temperature that imparts fluidity. The mould is provided with an exhaust channel for exhausting gas molecules generated by heating the high polymer material. The exhaust channel can be realized by arranging a cavity, a channel or a hole in the die, so that gas molecules can be smoothly exhausted, and defects and holes are reduced. During the hot pressing process, the screw heater extrudes the preheated powder into the mold. The heating and extrusion are carried out simultaneously through the heating function of the screw heater and the exhaust passage of the die. This reduces the need for preheating and reduces production costs and process complexity. By the technical means, the technical problems of hard shell formation, unsmooth gas molecule discharge, increased production cost and process complexity, reduced product quality and the like in the prior art are solved. The equipment can improve hot-pressing exhaust efficiency, and reduce defects and holes of high polymer materials, so that the processing rate is improved, and the surface defects of the workpiece after hot pressing are reduced.
The polyimide powder is preheated, extruded into a cavity of a die by a screw, and is subjected to hot press molding after an exhaust design is arranged in the cavity. The temperature of the screw is lower than the temperature of the cavity of the die, namely the polyimide material is not heated to be higher than the glass transition temperature, namely the polyimide powder is ensured not to be solidified, and certain fluidity is still maintained. After extrusion into a mold, the transition temperature is reached during hot pressing to form a cured resin, i.e., the desired hot pressed bulk material.
Preferably, in the use process of the utility model, materials enter the cavity 7 through the feed inlet 4, after reaching a certain height, the ejector pins 8 are put in the corresponding positions of the cavity 7 of the upper cover 2, and the pushing down is started to perform hot pressing operation; after the materials are compacted, the ejector pins 8 are positioned in the cavities 7 to form a plane state, and the hot pressing is completed.
In order to prove the inventive and technical value of the technical solution of the present utility model, this section is an application example on specific products or related technologies of the claim technical solution.
The mold was preheated to 250 degrees, the feed inlet was preheated to 250 degrees, and simultaneously the screw was preheated to 150 degrees, 50g of polyimide powder was added, and the mixture was extruded into the mold via the screw, heat press treatment was performed, and after 1 hour of heat press, the polyimide resin block was obtained by demolding, that is, application example.
For comparison, the same type of polyimide powder is put into a common mold, heated to 250 ℃, hot-pressed for 1 hour, and then demolded to obtain a polyimide resin block, namely the application comparative example.
The embodiment of the utility model has a great advantage in the research and development or use process, and has the following description in combination with data, charts and the like of the test process.
The mechanical tensile test was performed without using the inventive die, using the polyimide blocks of the inventive die (application example) and using the polyimide blocks of ordinary hot pressing (application comparative example), with reference to the test method of the GB/T13022-1991 specimen, and the technical advantages of the present utility model were examined by the degree of mechanical tensile test performance.
| Tensile Strength (MPa) | Tensile modulus (GPa) | |
| Application examples | 78.6±2.0 | 6.5±0.2 |
| Comparative examples of application | 35.7±2.0 | 3.0±0.3 |
In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the utility model is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present utility model will be apparent to those skilled in the art within the scope of the present utility model.
Claims (4)
1. The utility model provides a polymer powder hot press unit which characterized in that, polymer powder hot press unit includes: the air exhaust hole, the upper cover, the hot-pressing die and the feeding port; the exhaust hole is arranged on the upper cover, the upper cover can be combined with the hot-pressing die, and the feed inlet is arranged on the side surface of the hot-pressing die;
The feeding hole is connected with a power supply, the power supply can supply power to the electric heating wire, and the electric heating wire is arranged in the feeding hole and can heat;
the hot pressing die is internally provided with a cavity which can contain materials.
2. The polymer powder hot pressing apparatus of claim 1, wherein the upper cover has two cavities formed therein.
3. The polymeric powder autoclave of claim 1, wherein the cavity is in communication with the vent.
4. The polymer powder hot pressing apparatus of claim 1, wherein the cavity has pins disposed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322425775.0U CN221112593U (en) | 2023-09-07 | 2023-09-07 | Polymer powder hot press device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322425775.0U CN221112593U (en) | 2023-09-07 | 2023-09-07 | Polymer powder hot press device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221112593U true CN221112593U (en) | 2024-06-11 |
Family
ID=91370180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322425775.0U Active CN221112593U (en) | 2023-09-07 | 2023-09-07 | Polymer powder hot press device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221112593U (en) |
-
2023
- 2023-09-07 CN CN202322425775.0U patent/CN221112593U/en active Active
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