TWI810187B - Insulating composite plate and method for producing the same - Google Patents

Abstract

The present application provides an insulating composite plate comprising: an upper plate layer, a lower plate layer, and a middle plate layer, wherein the upper plate layer and the lower plate layer are made of a thermoplastic material; the middle plate layer is located between the upper plate layer and the lower plate layer, the middle plate layer being a metal mesh; the upper surface of the middle plate layer and the lower surface of the upper plate layer are bonded together, and the lower surface of the middle plate layer and the upper surface of the lower plate layer are bonded together. An insulating composite plate provided by this application has good insulation properties and can shield electromagnetic interference.

Description

Insulating composite panel and method for producing same

This case involves an insulating composite board, especially an insulating composite board with electromagnetic shielding function, which is used for applications that need to realize electromagnetic shielding and insulation at the same time.

Insulating plates are used to isolate various electronic devices or components to avoid failures caused by short circuits, breakdowns, etc. between electronic devices or components, or electronic components in electronic devices or components, and reduce the risk of fire in electronic devices or components , so as to ensure the normal operation of various electronic components. According to different uses of insulating boards, insulating films are required to have different working characteristics.

Therefore, it is desirable to provide an insulating board with excellent performance.

According to the first aspect of the present case, there is provided an insulating composite board, which includes: an upper layer of the board and a lower layer of the board, the upper layer of the board and the lower layer of the board are made of thermoplastic materials; and a middle layer of the board, the middle layer of the board is located at the Between the upper layer of the board and the lower layer of the board, the middle layer of the board is a metal mesh; The upper surface of the middle layer of the board is bonded to the lower surface of the upper layer of the board, and the lower surface of the middle layer of the board is bonded to the upper surface of the lower layer of the board.

As in the aforementioned sheet material, the upper layer of the sheet material and the lower layer of the sheet material are bonded together at the positions of the meshes of the metal mesh.

As in the aforementioned plate, wherein: the insulating composite plate is configured to be formed into a shape of a battery pack cover; and the battery pack cover is configured to be assembled on a battery pack shell.

As in the aforementioned plate, wherein: the insulating composite plate is shaped to have four walls extending from its peripheral edges to form a battery pack cover.

As in the aforementioned sheet material, wherein: the thermoplastic material is a thermoplastic resin.

As in the aforementioned board, wherein: the insulating composite board is made by tape casting hot pressing or co-extrusion process; The mesh holes on the net contact the lower layer of the sheet or the upper layer of the sheet on the other side of the metal mesh. After the thermoplastic material in the molten state is solidified, the upper layer of the sheet and the lower layer of the sheet are integrated, thereby locking the metal mesh to the sheet. Between the upper layer and the lower layer of the board.

As with the aforementioned panels, the upper layer of the panel and the lower layer of the panel are bonded together without the use of additional media.

As in the aforementioned sheet, the thermoplastic resin forming the upper sheet and the lower sheet passes through the meshes of the metal mesh in a molten state, so that the upper sheet and the lower sheet are bonded together.

As in the aforementioned plate, the upper layer of the plate and the lower layer of the plate are made of the same material.

As in the aforementioned panel, the upper layer of the panel and the lower layer of the panel are made of different materials.

Like the aforementioned sheet material, the thermoplastic material can be selected from PP, PC or PET.

As mentioned above, the thermoplastic material is PP.

As in the aforementioned board, the upper layer of the board and the lower layer of the board do not contain flame retardants.

As in the aforementioned sheet, the upper layer of the sheet and the lower layer of the sheet contain a flame retardant.

As in the aforementioned sheet, the flame retardant is a halogenated flame retardant or a halogen-free flame retardant, the halogenated flame retardant is a bromine-containing flame retardant or a chlorine-containing flame retardant, and the halogen-free flame retardant It is phosphorus-containing flame retardant or nitrogen-containing or silicon-containing or sulfur-containing or inorganic flame retardant.

As in the aforementioned sheet, when a flame retardant is used in the upper layer of the sheet and the lower layer of the sheet, the flame retardant grade of the sheet is V-2 or VTM-2 or higher, or V-0 or VTM-0 , and meet Rohs standard.

Like the aforementioned board, the metal mesh is made of copper or other metals or alloys.

As in the aforementioned sheet material, the metal mesh is made of copper or its alloys.

As in the aforementioned plates, the specification of the metal mesh is 20-400 mesh, or 50-100 mesh.

As mentioned above, the thickness of the upper layer of the board is 0.05-4.0mm, or 0.43-2mm; the thickness of the middle layer of the board is 0.05-0.4mm; the thickness of the lower layer of the board is 0.05-4.0mm, or 0.43-2mm.

Like the aforementioned plate, the thickness of the plate is 0.15-5.0mm, or 0.75-4mm, or 1.5-3mm, the CTI of the plate is above 250 volts, or above 600 volts, and the RTI of the plate is 90 ℃ or more.

Like the aforementioned sheet, the sheet is made by tape casting, hot pressing or co-extrusion.

According to a second aspect of the present application, there is provided a method for producing an insulating composite board, the method comprising: (a) extruding particles of a first thermoplastic material on an extruder to melt them to form the first thermoplastic material in a molten state; (b) the first thermoplastic material in the molten state flows out from the extruder and enters the die of the die through the connecting pipe, and is formed into a first sheet thermoplastic material in the die of the die; (c) providing metal a wire; (d) simultaneously conveying the metal mesh and the first sheet of thermoplastic material to the cooling forming roll such that the first sheet of thermoplastic material is compressed On one side of the metal mesh, forming a laminated sheet consisting of the first sheet-like thermoplastic material and the metal mesh; (f) extruding pellets of the second thermoplastic material on an extruder to melt, Forming the second thermoplastic material in the molten state; (g) the second thermoplastic material in the molten state flows out from the extruder and enters the die of the die through the connecting pipe, and internally formed into a second sheet of thermoplastic material; (h) simultaneously conveying the press-fit sheet and the second sheet of thermoplastic material to the cooling forming roll so that the second sheet of thermoplastic material is press-bonded on On the other side of the metal mesh, the insulation layer is formed with a sheet middle layer made of a metal mesh, and a sheet upper layer and a sheet lower layer respectively formed of the first sheet-like thermoplastic material and the second sheet-like thermoplastic material. Composite panels.

As in the aforementioned method for producing an insulating composite board, the first thermoplastic material and the second thermoplastic material are both selected from PP, PC or PET.

As in the aforementioned method of producing insulating composite panels, the first thermoplastic material and the second thermoplastic material are the same or different.

A method of producing an insulating composite panel as before, wherein the metal mesh is delivered to the chill forming roll by providing the metal mesh by unwinding from a roll of metal mesh.

As in the aforementioned method for producing insulating composite boards, the laminated sheet formed in step (d) is rolled into a laminated sheet roll, and the The laminated sheet stock roll unwinds the laminated sheet to convey the laminated sheet to the cooling forming roll.

As in the aforementioned method for producing insulating composite boards, the speed at which the first sheet-like thermoplastic material and the second sheet-like thermoplastic material leave the die of the machine head and the rotational speed of the cooling forming roll are determined to determine the The thickness of the upper layer of the sheet and the lower layer of the sheet.

As mentioned above, the method for producing an insulating composite board includes the step (i) of heating the laminated sheet before the step (h).

As in the aforementioned method for producing an insulating composite board, the thermoplastic material on the upper layer of the board and/or the lower layer of the board passes through the mesh holes of the metal mesh in a molten state, and contacts the lower layer of the board or the upper layer of the board on the other side of the metal mesh, thereby After the thermoplastic material in the molten state is solidified, the upper layer of the board and the lower layer of the board are integrated, thereby locking the metal mesh between the upper layer of the board and the lower layer of the board.

According to a third aspect of the present application, there is provided a method of producing an insulating composite sheet, the method comprising: (a) extruding pellets of a first thermoplastic material on a first extruder to melt to form a first thermoplastic material in a molten state; thermoplastic material; (b) the first thermoplastic material in the molten state flows out from the first extruder and enters the first die of the die through the first connecting pipe, and forms in the die of the first die being a first sheet-like thermoplastic material; (c) extruding pellets of the second thermoplastic material on a second extruder to melt to form the second thermoplastic material in a molten state; (d) The second thermoplastic material in the molten state flows out from the second extruder and enters the die of the second die through the second connecting pipe, and is formed into a second sheet in the die of the second die thermoplastic material; (e) providing a metal mesh; (f) simultaneously conveying said metal mesh, said first sheet of thermoplastic material, and said second sheet of thermoplastic material to chilled forming rolls such that said first sheet The thermoplastic material and the second sheet-like thermoplastic material are respectively pressed on opposite sides of the metal mesh to form a board middle layer made of metal mesh and respectively composed of the first sheet-like thermoplastic material and the A second sheet of thermoplastic material forms the insulating composite panel for the upper panel layer and the lower panel layer.

As in the aforementioned method of producing an insulating composite sheet, the first thermoplastic material and the second thermoplastic material in a molten state are brought into contact with each other through mesh holes in a metal mesh, so that the first thermoplastic material and the second thermoplastic material in a molten state are solidified After that, they are integrated with each other, so that the metal mesh is locked between the upper layer of the board and the lower layer of the board.

As in the aforementioned method for producing an insulating composite board, the first thermoplastic material and the second thermoplastic material are both selected from PP, PC or PET.

As in the aforementioned method of producing insulating composite panels, the first thermoplastic material and the second thermoplastic material are the same or different.

A method of producing an insulating composite panel as before, wherein the metal mesh is delivered to the chill forming roll by providing the metal mesh by unwinding from a roll of metal mesh.

As in the aforementioned method for producing insulating composite boards, the speed at which the first sheet-like thermoplastic material and the second sheet-like thermoplastic material leave the die of the machine head and the rotational speed of the cooling forming roll are determined to determine the The thickness of the upper layer of the sheet and the lower layer of the sheet.

The composite sheet provided in this case has excellent insulation performance and electronic shielding function, and is suitable for isolating various electronic components.

12:Metal mesh roll

100: Insulation composite sheet

101: the upper layer of the plate

102:Metal mesh/sheet middle layer

103: The lower layer of the plate

105: mesh

301: Extrusion equipment

301.1: First Extrusion Equipment

301.2: Second extrusion equipment

302: Molding equipment

305: Nose die

305.1: Nose die

307: Hopper

307.1: Hoppers

307.2: Hoppers

309: Fuselage

309.1: Fuselage

309.2: Fuselage

310: Lamination sheet

321: fuselage outlet

323: feeding port

328: Forming roller/roller

328.1: Forming rolls

328.2: Forming rolls

328.3: Forming rolls

330: pipeline

330.1: Pipelines

351: export port

351.1: Export port

351.2: Export port

352: entry port

352.1: Entry port

352.2: Entry port

352.1: Entry port

360: First sheet thermoplastic material

380: Second sheet thermoplastic material

600: battery pack cover

These and other features and advantages of the present case may be better understood by reading the following detailed description with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout: FIG. A schematic cross-sectional view of an insulating composite sheet; FIG. 2 is another schematic cross-sectional view of the insulating composite sheet shown in FIG. The state together; Fig. 3A, 3B show the flow casting thermocompression forming process of the insulating composite sheet according to one embodiment of the present case; Fig. 4 shows the co-extrusion process of producing the insulating composite sheet according to one embodiment of the present case; Fig. 5 It is a top view of the metal mesh in the insulating composite sheet in this case; Fig. 6 is a schematic diagram of a battery pack cover made of the insulating composite sheet in this case; FIG. 7 is a schematic diagram of the battery pack in FIG. 6 being covered on the battery pack case.

Various specific embodiments of the present invention will be described below with reference to the accompanying drawings, which form a part hereof. It should be understood that although terms indicating direction are used in this case, such as "front", "rear", "upper", "lower", "left", "right", etc. to describe various aspects of this case Example structural parts and elements, but these terms are used herein for explanatory purposes only, based on the example orientations shown in the figures. Since the disclosed embodiments may be arranged in different orientations, these directional terms are for illustration only and should not be viewed as limiting. In the following drawings, the same reference numerals are used for the same components, and the similar reference numerals are used for similar components to avoid repeated descriptions.

Fig. 1 shows a schematic cross-sectional view of an insulating composite board 100 according to an embodiment of the present application. As shown in FIG. 1 , the board 100 includes an upper board layer 101 , a middle board layer 102 and a lower board layer 103 bonded together. The board upper layer 101 and the board lower layer 103 are made of thermoplastic material, so that the board 100 has a good insulating effect. The thermoplastic material may be a thermoplastic resin. The thermoplastic materials used to make the upper board layer 101 and the lower board layer 103 may be the same or different. The thermoplastic material used to make the board upper layer 101 and the board lower layer 103 can be PP, PC or PET. In one embodiment, PP is used as the material of the board upper layer 101 and the board lower layer 103 . This is because: (1) PP is a non-toxic, odorless, tasteless milky white high crystalline polymer with a density of 0.90-0.91g/cm ³ and is one of the lightest types of all plastics at present. Therefore, PP is selected as the upper layer of the board 101 and the material of the lower layer 103 of the sheet, a sheet 100 with a lighter total weight can be obtained to meet the weight requirements of the sheet for practical applications (such as electric vehicle battery pack cover); (2) and PP is a hydrophobic polymer material, and its electric Excellent insulation performance, choosing PP as the material of the upper layer 101 and the lower layer 103 of the board can make the board 100 obtain better insulation performance; (3) PP has good formability, making it easy to obtain the board 100 through the molding process; (4) PP The melting point is 164-170°C, and it has good heat resistance. The product can be used for a long time below 125°C, and it will not deform at 150°C without external force, so that it can meet the requirements of the plate 100 in practical applications (for example, as a battery) (5) The chemical stability of PP is very good, except that it can be corroded by concentrated sulfuric acid, concentrated nitric acid or strong oxidants, it is relatively stable to various other chemical reagents, so that it can meet the practical application The environment (such as the battery pack cover of an electric vehicle) has requirements on the solvent resistance of the plate 100 .

The thermoplastic material of the board upper layer 101 and/or the board lower layer 103 may optionally be added with a flame retardant or not. When a flame retardant is added to the thermoplastic material of the upper layer 101 of the board and/or the lower layer 103 of the board, the flame retardant is a halogenated flame retardant or a halogen-free flame retardant, and the halogenated flame retardant is a bromine-containing flame retardant or a chlorine-containing flame retardant. Flame retardant, the halogen-free flame retardant is a phosphorus-containing flame retardant or a nitrogen-containing or silicon-containing or sulfur-containing or inorganic flame retardant. No matter what kind of flame retardant is added to the thermoplastic material of the upper layer 101 and/or the lower layer 103 of the board, they all meet the requirements of the RoHS standard. And the flame retardant grade of the board can reach V-2 or VTM-2 or above, and even V-0 or VTM-0.

The board middle layer 102 is located between the board upper layer 101 and the board lower layer 103 . The middle layer 102 of the board is a metal mesh, so that the insulating composite board 100 of this case has the function of electromagnetic shielding. The metal mesh of the middle board layer 102 is embedded in the surfaces of the upper board layer 101 and the lower board layer 103 to form a firm connection between the upper board layer 101 , the middle board layer 102 and the lower board layer 103 . Fig. 5 shows a schematic structure of the metal mesh. The metal mesh can be copper or other metals, or an alloy of copper or other metals. In one embodiment, the metal mesh is copper or an alloy thereof. In another embodiment, the metal mesh is elemental copper. Due to the good ductility of copper, when single copper is used to manufacture the metal mesh of the middle layer 102 of the plate, it is beneficial to the subsequent thermoforming process to form the metal mesh. The mesh number of the metal mesh is related to the effect of electromagnetic shielding and the shaping and processing of the product. For the electromagnetic shielding effect of the metal mesh, the higher the mesh number of the metal mesh, the better; and for the shaping and processing of metal mesh products, the lower the mesh number of the metal mesh, the better. Considering two factors comprehensively, the mesh specification of the metal mesh is usually 20-400 mesh, or it can be 50-300 mesh, or it can be 50-200 mesh, or it can be 50-100 mesh, or it can be 80 mesh. The diameter of the metal wire can be 0.01-0.2mm, the distance between adjacent metal wires can be 0.05-0.3mm, and the thickness of the metal mesh can be 0.05-0.4mm. The mesh number of the metal mesh disclosed in this case can simultaneously realize a good electromagnetic shielding effect and facilitate product shaping and processing.

During the bonding process of the upper board layer 101, the middle board layer 102 and the lower board layer 103, at least one of the upper board layer 101 and the lower board layer 103 is in a molten state, so that the thermoplastic material of the upper board layer 101 and/or the lower board layer 103 in the molten state penetrates Through the mesh of the metal mesh, the contact The lower layer 103 of the plate or the upper layer 101 of the plate on the other side of the metal mesh. After the molten thermoplastic material is cooled and solidified, it is bonded together with the lower layer of the board and/or the upper layer 101 of the board, thereby forming the insulating composite board of this case.

Fig. 2 is another schematic cross-sectional view of the board 100, which is used to schematically show the state where the upper layer 101 of the board and the lower layer 103 of the board are bonded together through the meshes of the metal mesh. As shown in FIG. 2 , at the positions of the mesh holes 105 of the metal mesh of the middle layer 102 of the sheet material, the thermoplastic material of the upper sheet material layer 101 and/or the lower layer of the sheet material 103 penetrates through the mesh holes 105 of the metal mesh and is bonded together. As shown in FIG. 2 , the parts of the upper layer 101 of the board and the lower layer 103 of the board that pass through the mesh 105 of the metal mesh are bonded as if formed integrally. Through this bonding method, the upper board layer 101 and the lower board layer 103 can be bonded together without using other media (such as glue). Moreover, the bonding method of the upper layer 101 and the lower layer 103 of the insulating composite sheet 100 of this case makes the upper layer 101 and the lower layer 103 as if they are integrally formed, and can be firmly and tightly bonded together for a long time, so that the upper layer 101. The middle layer 102 of the board and the lower layer 103 of the board will not be separated, and there is no gap between the upper layer 101 of the board, the middle layer 102 of the board and the lower layer 103 of the board, so that moisture cannot enter between the upper layer 101 of the board, the middle layer 102 of the board and the lower layer 103 of the board The metal mesh of the middle layer 102 of the sheet is etched.

The thickness of the upper layer 101 of the insulating composite sheet 100 in this case is 0.05-4.0mm, the thickness of the middle layer 102 of the sheet is 0.05-0.4mm, or 0.43-2mm, and the thickness of the lower layer 103 of the sheet is 0.05-4.0mm, or 0.43-2mm. The total thickness of 0.15-5.0mm, or 0.75-4mm, or 1.5-3mm. The thickness of the insulating composite sheet in this case can meet the customer's requirements for the mechanical properties of the sheet. The CTI (Comparative Tracking Index, Relative Tracking Index) of the insulating composite sheet 100 of this case can reach more than 250 volts, even can reach more than 600 volts, especially when the thermoplastic material of the insulating composite sheet 100 of this case is PP, PC or PET case. For example, when PP is selected as the thermoplastic material to make the insulating composite plate 100 of the present application, the insulating composite plate 100 of the present application can obtain a higher CTI. The RTI (Relative Thermal Index, Relative Thermal Index) of the insulating composite board 100 in this case can reach above 90°C.

The insulating composite board 100 of this case has the following advantages: the insulating composite board 100 of this case has a good insulating effect due to the board upper layer 101 and the board lower layer 103 made of thermoplastic materials. Moreover, since the middle layer 102 of the insulation composite board 100 of this application is a metal mesh, the insulation composite board 100 of this application has the function of electromagnetic shielding at the same time.

The inventor noticed that in applications where insulation of components is required, generally insulating plates are used to achieve the purpose of insulation; in applications where electromagnetic shielding is required, metal plates are generally used to achieve electromagnetic shielding; The application of insulation and electromagnetic shielding requires the combined use of insulating plates and metal plates. However, the insulating composite board 100 of this case combines insulating materials and metal meshes together, so as to meet the application requirements of both insulation and battery shielding.

In addition, the inventors observed that due to the heavy weight of the metal plate, the electromagnetic shielding through the metal plate will increase the weight of the device or equipment using the metal plate, thereby causing various problems such as increased energy consumption of the device or equipment. However, the insulation composite board 100 of this case has an upper board layer 101 and a lower board layer 103 made of thermoplastic materials, so that the weight of the board 100 of this case is relatively light, so that compared with using a metal plate for electromagnetic shielding, the use of the insulating board of this case The electromagnetic shielding of 100 reduces the weight of the equipment or device, and thus avoids the problems caused by the excessive weight of the metal plate, such as reducing the weight of the equipment or device to reduce energy consumption and the like.

Moreover, the upper layer 101 and the lower layer 103 of the insulation composite sheet 100 of this case are bonded together through the meshes of the metal mesh in the middle layer 102 of the sheet in a molten state during the molding process, as if formed integrally, so that the upper layer 101 and the lower layer 103 of the sheet The lower layer 103 of the board can be firmly and tightly bonded together for a long time without separation, and there is no gap between the upper layer 101 of the board, the middle layer 102 of the board and the lower layer 103 of the board, so that moisture cannot enter the upper layer 101 of the board, the lower layer of the board 103, etc. The metal mesh of the middle layer 102 of the board is corroded between the middle layer 102 and the lower layer 103 of the board. Moreover, the metal mesh of the middle layer 102 of the board is embedded or at least partially embedded in the surfaces of the upper layer 101 and the lower layer 103 of the board, which further enhances the bonding strength between the layers of the board 100 .

The insulating composite board 100 of the present application is suitable for various applications requiring electromagnetic shielding and insulation. In particular, the insulating composite sheet 100 of the present application is particularly suitable for use as a battery pack cover of an electric vehicle due to the above-mentioned advantages. At present, global energy and the environment are facing enormous challenges. Cars, as major oil consumers and carbon dioxide emitters, need revolutionary changes. In order to reduce carbon dioxide emissions, the development of new energy vehicles has reached a global consensus. In the long run, pure electric drive including pure electric and fuel cell technology will be the main technical direction of new energy vehicles. In the short term, gasoline-electric hybrid and plug-in hybrid will be important transition routes. At present, the research and development hotspot of electric vehicles is mainly the improvement of cruising range. The direction of improvement comes from the improvement of battery technology on the one hand, and the reduction of body weight on the premise of ensuring vehicle safety on the other hand. Because the battery in the electric vehicle will emit electromagnetic waves during the running program, it is easy to generate electromagnetic interference to other electronic components of the vehicle and have adverse effects on the human body. The current solution is to add a metal cover on the top of the battery. However, the weight of the metal cover is relatively large. Therefore, using a metal cover plate to cover the vehicle battery increases the weight of the vehicle body, and thus leads to higher energy consumption of the vehicle, which is not conducive to improving the cruising range of the electric vehicle. And the battery pack cover of the electric vehicle made by using the insulating sheet 100 of this case not only makes the battery pack cover have the function of electromagnetic shielding while having good insulation effect, but also because the battery pack cover made of the insulating composite sheet 100 of this case Compared with the metal plate in the prior art, the weight of the metal plate is greatly reduced, which can reduce the weight of the vehicle body, and thus reduce the energy consumption of the vehicle, thereby meeting the development expectation of increasing the cruising range of the electric vehicle, and because each layer of the insulating composite plate 100 in this case can be long Time is firmly and tightly bonded together without separation, so that there is no gap between the layers of the board, so that moisture and the like cannot enter between the layers of the board and corrode the metal mesh of the middle layer 1 of the board, so that the insulating composite board of this case is 100 It can maintain excellent electromagnetic shielding effect for a long time.

FIG. 6 is a schematic diagram of a battery pack cover 600 made of the insulating composite sheet 100 of the present application. The battery pack cover 600 is made into a shape with four walls extending from the surrounding edges, and is used to cover the shell of the battery pack, so that the four walls extending from the surrounding edges of the battery pack cover 600 surround the four sides of the battery pack shell. wall. FIG. 7 shows a schematic diagram of the battery pack cover 600 in FIG. 6 covering the battery pack shell.

FIG. 3A and FIG. 3B are schematic diagrams of the tape casting and thermocompression forming process of the plate 100 according to an embodiment of the present application. The tape casting and thermocompression forming line includes extrusion equipment 301 and molding equipment 302 . Wherein the extrusion device 301 includes a nose die 305 , a body 309 and a feeding hopper 307 . Hopper 307 is used to receive thermoplastic material. The nose die 305 has an inlet port 352 and an outlet port 351 . The fuselage 309 has a fuselage outlet port 321, and the fuselage outlet port 321 is connected to the inlet port 352 of the nose die 305 through a pipeline 330 for conveying materials to the nose die 305. The body 309 also has a feeding port 323 connected to the feeding hopper 307 for receiving materials from the feeding hopper 307 . A driving mechanism, such as a driving screw (not shown), is provided in the body 309 . The nose die 305 has a suitable width and thickness, which is convenient to accommodate the materials transferred from the fuselage 309, and the die cavity of the die 305 of the die is roughly flat, so that the materials conveyed from the fuselage can be molded into a flat shape. shape. The forming apparatus 302 has a plurality of rollers 328 for cooling and forming.

The casting hot-pressing process shown in FIGS. 3A and 3B is as follows: As shown in FIG. 3A , the first thermoplastic material pellets are fed into the feeding hopper 307 . The first thermoplastic material particles enter the body 309 through the feeding port of the body 309 . The first thermoplastic material particles are melted in the fuselage 309 to form After being in a molten state and mixed evenly, it is transported through the driving mechanism of the fuselage through the pipeline 330 to the inlet port 352 of the die 305 of the die and enters the die 305 of the die. In the die 305 of the die, the first thermoplastic material in a molten state is molded to form a first sheet of thermoplastic material 360 . The first sheet of thermoplastic material 360 is output from the outlet end 351 of the die 305 to the forming roller 328 of the forming device 302 .

When conveying the first sheet-shaped thermoplastic material 360 to the forming roller 328, the metal mesh 102 is unrolled from the metal mesh coil 12, so that the unrolled metal mesh 102 and the first sheet-shaped thermoplastic material 360 are simultaneously conveyed in an up-down positional relationship. To the forming roll 328 of the forming device 302, and pass between the forming rolls 328.1 and 328.2 and between the forming rolls 328.2 and 328.3 in sequence, the forming rolls 328.1, 328.2 and 328.3 apply stretching to the first sheet thermoplastic material 360 and the metal mesh 102 and pressing force, so that the metal mesh 102 is embedded or at least partially embedded in the surface of the first sheet-shaped thermoplastic material 360 to form a pressing sheet 310, and then the pressing sheet 310 is rolled into a pressing sheet material roll. According to needs, the metal mesh 102 and the first sheet-like thermoplastic material 360 may pass through multiple rollers, or may only pass through two rollers.

Next, as shown in FIG. 3B, after the first step, the second step of the cast hot pressing process is shown in FIG. 3B. Similar to the first step, the second thermoplastic material particles are added to the fuselage 309 from the hopper 307 . The second thermoplastic material particles may be the same as or different from the first thermoplastic material particles. The second thermoplastic material particles enter the fuselage 309 through the feeding port of the fuselage 309 . The second thermoplastic material particles are melted in the fuselage 309 to form a molten state and mixed evenly, and then transported through the pipeline 330 to the machine head through the driving mechanism of the fuselage The inlet port 352 of the die 305 enters the nose die 305 . In the die 305 of the die, the second thermoplastic material in the molten state is molded to form a second sheet of thermoplastic material 380 in the molten state. The second sheet of thermoplastic material 380 is output from the outlet port 351 of the die 305 to the forming roller 328 of the forming device 302 .

While the second sheet-like thermoplastic material 380 is output from the outlet end 351 of the nose die 305 to the forming roller 328 of the molding device 302, the pressed sheet 310 formed in FIG. 3A is unrolled from the rolled sheet stock, The unrolled laminated sheet 310 and the second sheet-like thermoplastic material 380 are conveyed to the forming roller 328 of the forming device 302 at the same time, and pass between the forming rollers 328.1 and 328.2 and between the forming rollers 328.2 and 328.3 in sequence. In this procedure, the side of the metal mesh 102 of the pressing sheet 310 faces the second sheet of thermoplastic material 380 . The forming roller 328 exerts stretching and pressing force on the second sheet of thermoplastic material 380 and the pressing sheet 310 , so that the metal mesh 102 of the pressing sheet 310 is embedded or at least partially embedded in the second sheet of thermoplastic material 380 . And, because the second sheet-shaped thermoplastic material 380 is in a molten state when it leaves the outlet end 351 of the nose die, when the forming roller 328 presses the second sheet-shaped thermoplastic material 380 and the pressing sheet 310, the second sheet-shaped thermoplastic material 380 in the molten state The sheet of thermoplastic material 380 may flow through the meshes of the metal mesh 102 to contact the first sheet of thermoplastic material 360 of the lamination sheet 310 and solidify after being cooled by the forming rollers 328 so that the second sheet of thermoplastic material 380 and the first sheet of thermoplastic material 380 The sheet of thermoplastic material 360 is like a one-piece molding, and can maintain a strong and tight bond for a long time. And, before the laminated sheet 310 is conveyed by unwinding the laminated sheet material or delivered to the forming roller 328, as required, Selectively heating the pressing sheet 310 makes the first sheet-like thermoplastic material 360 therein reach a molten state, thereby achieving stronger and tighter bonding of the first sheet-like thermoplastic material 360 and the second sheet-like thermoplastic material 380 .

The insulating composite board 100 of the present application is obtained through the above tape-casting hot-pressing process shown in FIGS. 3A and 3B .

In the above casting hot pressing process, the desired shape of the upper layer 101 of the sheet and the lower layer 103 of the sheet can be obtained by controlling the speed at which the first sheet-like thermoplastic material and the second sheet-like thermoplastic material leave the die 305 of the die 305 and the rotating speed of the forming roller 328. thickness.

Figure 4 shows the co-extrusion process for producing the insulation composite board according to the present application, in which there are two extrusion equipment and one molding equipment. As shown in Figure 4, the first extruding device 301.1 prepares the first sheet-like thermoplastic material 360, the second extruding device 301.2 prepares the second sheet-like thermoplastic material 380, the first sheet-like thermoplastic material 360, the metal mesh 102 and the second The sheet-like thermoplastic material 380 is jointly formed by the forming equipment 302 to obtain the plate 100 .

Wherein the first thermoplastic material particles are fed into the hopper 307.1 into the fuselage 309.1. The first thermoplastic material melts in the fuselage 309.1 to form a molten state, and is transported by the driving mechanism of the fuselage 309.1 through the pipeline 330.1 to the inlet port 352.1 of the nose die 305.1 into the nose die 305.1, and in the nose die 305.1 The molten first thermoplastic material is molded to form a molten first sheet of thermoplastic material 360 . The second sheet-like thermoplastic material 360 is output to the forming roller 328 of the forming device 302 from the outlet port 351.1 of the nose die 305.1.

At the same time, pellets of the second thermoplastic material are fed into the hopper 307.2 into the fuselage 309.2. The second thermoplastic material particles may be the same as or different from the first thermoplastic material particles. The second thermoplastic material melts in the fuselage 309.2 to form a molten state, and is transported by the driving mechanism of the fuselage 309.2 through the pipeline 330.2 to the inlet port 352.2 of the nose die 305.2 into the nose die 305.2, in the nose die 305.2 The molten second thermoplastic material is compression molded to form a molten second sheet of thermoplastic material 380 . The second sheet of thermoplastic material 380 is output from the outlet port 351.2 of the nose die 305.2 to the forming roller 328 of the forming device 302 .

Simultaneously, the metal mesh 102 is unrolled from the metal mesh coil 12, so that the unrolled metal mesh 102 and the first sheet thermoplastic material 360 and the second sheet thermoplastic material 380 are simultaneously conveyed to the forming roller 328 of the forming device 302, and Pass through between forming rollers 328.1 and 328.2 and between forming rollers 328.2 and 328.3 in sequence. In this procedure, the metal mesh 102 is positioned between the first sheet of thermoplastic material 360 and the second sheet of thermoplastic material 380 . The forming rollers 328.1, 328.2 and 328.3 apply stretching and pressing force to the first sheet-like thermoplastic material 360, the second sheet-like thermoplastic material 380 and the metal mesh 102, so that the metal mesh 102 is embedded or at least partially embedded in the first sheet-like thermoplastic material 360 and the surface of the second sheet of thermoplastic material 380 . And, since the first sheet-like thermoplastic material 360 and the second sheet-like thermoplastic material 380 are in a molten state when they leave the outlet ports 351.1 and 351.2 of the die of the die, when the forming roller 328 presses the first sheet-like thermoplastic material 360 and the second sheet-like thermoplastic material 360 When the two sheets of thermoplastic material 380 and the pressing sheet 310, the first sheet in the molten state The first sheet of thermoplastic material 360 and the second sheet of thermoplastic material 380 can flow through the meshes of the metal mesh 102 into contact with each other and solidify after being cooled by the forming rollers 328 so that the first sheet of thermoplastic material 360 and the second sheet of thermoplastic material 360 and the second sheet of thermoplastic material Material 380 is generally formed in one piece and can maintain a strong and tight bond for a long time.

According to needs, the metal mesh 102 and the first sheet-like thermoplastic material 360 and the second sheet-like thermoplastic material 380 may pass through multiple rollers, or may only pass through two rollers.

In the composite sheet 100 made by the above two processes, the upper layer 101 and the lower layer 103 of the sheet are bonded together without the use of additional media (such as glue), but as if they are integrally formed, so the metal mesh The middle layer 102 of the board, the upper layer 101 of the board and the lower layer 103 of the board can be firmly and tightly bonded together for a long time, and it is not easy to separate, and there is no gap between the middle layer 102 of the board, the upper layer 101 of the board and the lower layer 103 of the board, so that moisture cannot enter the middle layer of the board 102. The metal mesh is corroded between the upper layer 101 of the board and the lower layer 103 of the board.

The following are examples of samples of composite plates made by tape casting and hot pressing. The materials used in these embodiments are as follows: PP is produced by Yizhou Electronic Components (Shanghai) Co., Ltd., and the trade name is Formex GK; 0.2mm, thickness 0.15mm, copper content 99.8%.

Example 1

Using the method of tape casting and hot pressing molding, the PP particles are first plasticized and formed to obtain the upper layer of the board. The thickness of the upper layer of the board obtained by molding is 0.13mm. The upper layer of the formed plate and the copper mesh placed between the die and the roller are cooled and formed by the roller at the same time to obtain a laminated sheet. Then the PP particles are plasticized and shaped to obtain the lower layer of the board, and the thickness of the lower layer of the board is controlled to be 0.76mm. The previously formed upper layer of the board and the laminated sheet of the copper mesh are placed between the die of the machine head and the roller, and rolled together with the lower layer of the board to form an insulating composite board.

Example 2

The method of tape casting and hot pressing is used to plasticize the PP particles and form the upper layer of the board, and the thickness of the upper layer of the board obtained by molding is 0.25mm. The upper layer of the formed plate and the copper mesh placed between the die and the roller are cooled and formed by the roller at the same time to obtain a laminated sheet. Then the PP particles are plasticized and shaped to obtain the lower layer of the board, and the thickness of the lower layer of the board is controlled to be 2.5 mm. The previously formed upper layer of the board and the laminated sheet of the copper mesh are placed between the die of the machine head and the roller, and rolled together with the lower layer of the board to form an insulating composite board.

Example 3

Using the method of tape casting and hot pressing, the PP particles are first plasticized and formed to obtain the upper layer of the board, and the thickness of the upper layer of the board obtained by molding is 0.43mm. The upper layer of the formed plate and the copper mesh placed between the die and the roller are cooled and formed by the roller at the same time to obtain a laminated sheet. Then the PP particles are plasticized and shaped to obtain the lower layer of the board, and the thickness of the lower layer of the board is controlled to be 2.5 mm. The previously formed upper layer of the board and the laminated sheet of the copper mesh are placed between the die of the machine head and the roller, and rolled together with the lower layer of the board to form an insulating composite board.

Example 4

The method of tape casting and hot pressing is used to plasticize the PP particles and form the upper layer of the board, and the thickness of the upper layer of the board obtained by molding is 0.13mm. The upper layer of the formed plate and the copper mesh placed between the die and the roller are cooled and formed by the roller at the same time to obtain a laminated sheet. Then plasticize the PP particles and form the lower layer of the board to control the thickness of the lower layer of the board to be 0.76mm. The previously formed upper layer of the board and the laminated sheet of the copper mesh are placed between the die of the machine head and the roller, and rolled together with the lower layer of the board to form an insulating composite board.

Compare and observe the surface effects of the four samples prepared, and wrap the four samples and the aluminum foil into the self-made battery pack respectively, electrify the battery pack and set different frequencies, and wrap the battery pack with the four samples and the aluminum foil The electric field strength outside the front and rear battery packs was tested to obtain the difference of the electric field strengths outside the front and rear battery packs of the four samples and the aluminum foil wrapped battery packs. This difference reflects the obtained four samples. The effect of electromagnetic shielding on samples and aluminum foil. The following is the difference in electric field strength outside the battery pack before and after wrapping the battery pack with the four samples prepared and aluminum foil at a frequency of 50MHz. The results are as follows:

From the experimental results, according to the present invention, the four insulating composite plates made after the composite of PP and copper mesh have effectively reduced the electric field strength outside the battery pack after wrapping (referring to the electric field strength difference outside the battery pack before and after the test wrapping) value), and the electromagnetic shielding effect of the prepared four insulating composite sheets is similar to that of aluminum foil (having the same thickness as the middle copper mesh of the prepared four insulating composite sheets). Therefore, the insulating composite board of the present invention has a good electromagnetic shielding effect. In addition, when the thickness of the upper layer of the insulating composite board of the present invention is greater than 0.43 mm, since the upper layer of the board is thick and high in strength, the upper layer of the board and the copper mesh and the lower layer of the board are not easily deformed during the pressing process together, so that the prepared insulation The surface effect of the composite board is good, and the appearance is smooth and beautiful.

While only a few features of the invention have been illustrated and described herein, numerous modifications and changes will occur to those skilled in the art. It should therefore be understood that the appended claims are intended to cover all such improvements and changes that fall within the true spirit of this case.

101‧‧‧Plate upper layer

102‧‧‧Metal mesh/sheet middle layer

103‧‧‧Plate lower layer

Claims (3)

A method of producing an insulating composite sheet, wherein the method comprises: (a) extruding pellets of a first thermoplastic material on an extruder to melt to form the first thermoplastic material in a molten state; (b) the molten state After the first thermoplastic material flows out from the extruder, it enters the die of the die through the connecting pipe, and is formed into a first sheet thermoplastic material in the die of the die; (c) providing a metal mesh; (d) The metal mesh and the first sheet-shaped thermoplastic material are simultaneously conveyed to the cooling forming roll, so that the first sheet-shaped thermoplastic material is pressed on one side of the metal mesh to form the first sheet-shaped thermoplastic material. A laminated sheet made of a thermoplastic material and the metal mesh; (f) extruding particles of the second thermoplastic material on the extruder to melt to form a second thermoplastic material in a molten state; (g) the melting After the second thermoplastic material in the state flows out from the extruder, it enters the die of the machine head through the connecting pipe, and is formed into a second sheet thermoplastic material in the die of the machine head; (h) the The pressing sheet and the second sheet-shaped thermoplastic material are simultaneously conveyed to the cooling forming roller, so that the second sheet-shaped thermoplastic material is pressed on the other side of the metal mesh to form a The middle layer of the sheet material composed of mesh and respectively the first sheet thermoplastic The insulating composite panel is formed of an upper panel layer and a lower panel layer of a thermoplastic material and the second sheet-like thermoplastic material, wherein the upper panel layer and the lower panel layer are bonded to the metal mesh without the use of an additional medium The positions of the mesh holes are bonded together, wherein the specification of the metal mesh is 20-400 mesh, and wherein the thickness of the upper layer of the plate is 0.43-2mm. The method for producing an insulating composite board according to claim 1, comprising the step (i) of heating the press-bonded sheet before the step (h). A method of producing an insulating composite sheet, wherein the method comprises: (a) extruding pellets of a first thermoplastic material on a first extruder to melt to form the first thermoplastic material in a molten state; (b) said The first thermoplastic material in a molten state flows out from the first extruder and enters the first die of the die through the first connecting pipe, and is formed into a first sheet-shaped thermoplastic material in the die of the first die; (c) extruding pellets of a second thermoplastic material on a second extruder to melt to form a second thermoplastic material in a molten state; (d) extruding said second thermoplastic material in a molten state from said second extruder After the machine flows out, enter the second die of the die through the second connecting pipe, and be formed into a second sheet thermoplastic material in the die of the second die; (e) provide a metal mesh; (f) combine the metal mesh, The first sheet of thermoplastic material and the The second sheet-shaped thermoplastic material is simultaneously conveyed to the cooling forming roller, so that the first sheet-shaped thermoplastic material and the second sheet-shaped thermoplastic material are respectively pressed on the opposite sides of the metal mesh to form a The middle layer of the board composed of the metal mesh and the insulating composite board of the upper layer and the lower layer of the board formed by the first sheet-like thermoplastic material and the second sheet-like thermoplastic material respectively, wherein the upper layer of the board and the lower layer of the board are respectively The lower layer of the board is bonded together at the position of the mesh of the metal mesh without using additional media, wherein the specification of the metal mesh is 20-400 mesh, and the thickness of the upper layer of the board is 0.43-2mm.