A PTFE copper clad laminate production system and a method for preparing PTFE copper clad laminates

Abstract

This invention discloses a PTFE copper-clad laminate production system and a method for preparing PTFE copper-clad laminates. The production system includes an extrusion unit, a pressing and baking unit, and a copper-cladding unit. The pressing and baking unit is located on the discharge side of the extrusion unit, and the copper-cladding unit is located on the discharge side of the pressing and baking unit. The extrusion unit is used to extrude PTFE demulsified preforms into shape. The pressing and baking unit is used to press and bake the extruded PTFE material into a continuous PTFE semi-cured sheet. The copper-cladding unit is used to laminate copper foil onto the continuous PTFE semi-cured sheet. The extrusion unit can continuously extrude PTFE demulsified preforms into shape. The extruded PTFE material is then conveyed to the pressing and baking unit for pressing and baking to form a continuous PTFE semi-cured sheet. The continuous PTFE semi-cured sheet is then conveyed to the copper-cladding unit for copper cladding to obtain the PTFE copper-clad laminate. This system has a simple structure, can continuously produce PTFE copper-clad laminates, and improves the production efficiency of PTFE copper-clad laminates.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper-clad plate preparation, and particularly relates to a PTFE copper-clad plate production system and a method for preparing PTFE copper-clad plate. BACKGROUND

[0002] As a polymer-based composite substrate material, the copper-clad plate gradually becomes one of the most important basic materials in electronic information products.

[0003] At present, the automatic process of continuous PTFE copper-clad plate is blank in the industry, and the conventional preparation of copper-clad plate without glass cloth is mostly through a lamination process, that is, through copper foil and semi-solid lamination, and then through a hot pressing process, each link in the process needs to be controlled by human, and the obtained copper-clad plate is a sheet material produced in batches by the intermittent method, which affects the production efficiency.

[0004] Therefore, the prior art still needs to be further improved and promoted. SUMMARY

[0005] In view of the above problems of the prior art, the present application aims to provide a PTFE copper-clad plate production system and a method for preparing PTFE copper-clad plate, which aims to solve the problem of low production efficiency of the existing copper-clad plate.

[0006] A PTFE copper-clad plate production system, characterized in that it comprises an extrusion device, a pressing and baking device and a copper-clad device; the pressing and baking device is arranged on the discharge side of the extrusion device, and the copper-clad device is arranged on the discharge side of the pressing and baking device; the extrusion device is used for extruding PTFE demulsification blank into a shape, the pressing and baking device is used for stacking and pressing the several PTFE materials after the extrusion and baking into a PTFE continuous semi-solid sheet, and the copper-clad device is used for covering the copper foil with the PTFE continuous semi-solid sheet.

[0007] Optionally, the PTFE copper-clad plate production system, wherein the extrusion device comprises several extruders, and each extruder comprises a gradient cavity and a multi-stage concentric extrusion rod.

[0008] Optionally, the PTFE copper-clad plate production system, wherein the gradient cavity comprises a first-order cavity, a second-order cavity and a third-order cavity with diameters gradually decreasing, the feeding end of the second-order cavity is fixedly connected with the discharge end of the first-order cavity, the feeding end of the third-order cavity is fixedly connected with the discharge end of the second-order cavity, and the discharge port of the third-order cavity is flat or circular.

[0009] Further, when the discharge port is circular, each extruder is connected to a roller press, and the strip-shaped PTFE material is pressed into a sheet-shaped PTFE material by the roller press. Optionally, the PTFE copper-clad plate production system further comprises a shearing device arranged at the discharge side of the copper-clad device.

[0010] A method for preparing a PTFE copper-clad plate by using the PTFE copper-clad plate production system, comprising:

[0011] injecting the PTFE breaker embryo material into the extrusion device to form a flat PTFE material;

[0012] injecting the PTFE breaker embryo material into the extrusion device to form a strip-shaped PTFE material, and pressing the strip-shaped PTFE material into a sheet-shaped PTFE material by a roller press;

[0013] delivering the extruded flat or strip-shaped PTFE material to the pressing and baking device, stacking and pressing a plurality of flat or strip-shaped PTFE materials into a continuous and integral PTFE sheet material, and baking the PTFE sheet material into a PTFE continuous prepreg;

[0014] delivering the PTFE continuous prepreg to the copper-clad device, cladding the PTFE continuous prepreg with a copper foil, and simultaneously completing PTFE sintering to obtain the PTFE copper-clad plate.

[0015] Optionally, the method for preparing a PTFE copper-clad plate, wherein the extrusion device comprises a plurality of extruders, and before the step of injecting the PTFE breaker embryo material into the extrusion device to form an extruded material, the method further comprises preheating the extruders at a preheating temperature of 30-50℃.

[0016] Optionally, the method for preparing a PTFE copper-clad plate, wherein the step of delivering the extruded PTFE material to the pressing and baking device to press into a continuous PTFE sheet material, wherein the pressure of the pressing and baking device is 1-2 MPa.

[0017] Optionally, the method for preparing a PTFE copper-clad plate, wherein the step of baking the PTFE sheet material into a PTFE continuous prepreg, wherein the baking temperature is 270-300℃.

[0018] Optionally, the method for preparing a PTFE copper-clad plate, wherein the step of delivering the PTFE continuous prepreg to the copper-clad device, cladding the PTFE continuous prepreg with a copper foil, and simultaneously completing PTFE sintering, wherein the pressure is 2-8 MPa, and the sintering temperature is 360-400℃.

[0019] Optionally, the method for preparing the PTFE copper-clad plate, wherein the extrusion amount of each of the extruders is the same.

[0020] Beneficial effects: compared with the prior art, the PTFE copper-clad plate production system provided by the application can continuously extrude the PTFE breaking emulsion blank into a shape by using an extrusion device, and then transport the extruded PTFE material to a pressing and baking device for pressing and baking to form a PTFE continuous prepreg, and then transport the PTFE continuous prepreg to a copper-cladding device for copper-cladding to obtain a PTFE copper-clad plate. The system has a simple structure and can continuously produce the PTFE copper-clad plate, thereby improving the production efficiency of the PTFE copper-clad plate. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A PTFE copper-clad plate production system schematic diagram provided by an embodiment of the application;

[0022] Figure 2 A structure schematic diagram of an extruder in an embodiment of the application, and the right side is enlarged as a cross-sectional schematic diagram of a flat die of the extruder;

[0023] Figure 3 A PTFE copper-clad plate production system schematic diagram when the discharge port of the extruder is circular in an embodiment of the application;

[0024] Figure 4 A structure schematic diagram when the discharge port of the extruder is circular (the right side is enlarged) in an embodiment of the application. DETAILED DESCRIPTION

[0025] The application provides a low-dielectric resin substrate with high heat resistance and a preparation method and application thereof, in order to make the purpose, technical scheme and effects of the application more clear and explicit, the application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0026] As shown in Figure 1 A PTFE copper-clad plate production system provided by the application includes an extrusion device 10, a pressing and baking device 20 arranged at the discharge side of the extrusion device 10, a copper-cladding device 30 arranged at the discharge side of the pressing and baking device 20, and a shearing device 40 arranged at the discharge side of the copper-cladding device 30.

[0027] In the embodiment, the extrusion device 10 is used to extrude PTFE breaker cake into shape, the pressing and baking device 20 is used to press and bake the shaped PTFE material, the continuous and integral PTFE sheet material can be obtained by rolling the multiple flat or calendered sheet PTFE material, the continuous PTFE prepreg can be formed after baking and pressing, the obtained continuous PTFE prepreg is transported to the copper cladding device 30, the copper foil is combined with the continuous PTFE prepreg by the copper cladding device 30, and the PTFE copper-clad plate is obtained.

[0028] In the embodiment, the extrusion device 10 includes at least one extruder 11, and the number of the extruder 11 can be set according to actual needs, for example, three, four or five. When the extruder is set to multiple, for example, three, the extrusion amount of each extruder 11 is required to be the same (in the same time), and when the three-stage cavity of the extruder is matched with a circular die, for example, as shown in Figure 3 and Figure 4 each extruder is matched with a rolling machine 12 at the discharge end to press the strip-shaped PTFE material into sheet-shaped PTFE material. The flat PTFE material extruded by the extrusion device 10 or the sheet-shaped PTFE material calendered by the rolling machine 12 in the extrusion device 10 is stacked at the feeding end of the pressing and baking device 20. In the embodiment, the extruder 11 includes a gradient cavity 110 and a multi-stage concentric extrusion rod 120, and the gradient refers to that the extrusion cavity is composed of multiple cavities with gradually reduced diameters, and the corresponding extrusion rod is also composed of multiple concentric circular rods with gradually reduced diameters.

[0029] For example, as shown in Figure 2 or Figure 4As shown, the gradient cavity 110 is three orders, namely first-order cavity 111, second-order cavity 112 and third-order cavity 113, the feed end of the second-order cavity 112 is fixedly connected with the discharge end of the first-order cavity 111, and the feed end of the third-order cavity 113 is fixedly connected with the discharge end of the second-order cavity 112. Wherein, the diameters of the first-order cavity 111, the second-order cavity 112 and the third-order cavity 113 gradually decrease along the PTFE demulsification blank extrusion direction (such as the diameter ratio of 4:2:1), and the length of each order gradually increases along the PTFE demulsification blank extrusion direction (such as the length ratio of 1:1.5:2). According to the material properties of PTFE: under the action of extrusion force, PTFE continuously fiberizes and gradually densifies, realizing the continuous and strength improvement of PTFE; setting the gradual extrusion can make the material stress continuously increase, and complete the improvement of material density and mechanical strength. Therefore, the diameter of each cavity continuously decreases, and each cavity is long enough to ensure that the material is dense, shaped and stably extruded; the gradient extrusion process is: the three concentric extrusion rods extrude the raw material to the end of the first-order cavity, then the middle rod and the small rod extrude the raw material to the end of the second-order cavity, and finally the small rod extrudes the raw material from the third-order cavity. It is easy to understand that the extruder can realize continuous extrusion.

[0030] In the embodiment, the pressure baking device 20 includes a roller press 21 and a baking and track pressure bonding equipment 22. The plurality of PTFE materials extruded by the extrusion device are rolled by the roller press to form a continuous and integral PTFE sheet material. The continuous PTFE sheet material is baked and pressed by the baking and track pressure bonding equipment to become a PTFE continuous prepreg. Through the surface pressure of the track pressure bonding machine, the PTFE material can become more dense and the thickness can be more uniform, which is beneficial to subsequent lamination with copper foil. It should be noted that the roller press is a commonly used equipment in the prior art, and its specific structure is not required here, as long as it can meet the purpose of the present application. Its specifications and operation can be set according to actual needs, and will not be described here. The track pressure bonding machine needs to meet the requirements of simultaneously applying temperature and pressure, and the parameters can be flexibly changed as needed.

[0031] Exemplarily, the plurality of PTFE materials after extrusion molding are transported to the roller press for rolling to form a single-layer and integral PTFE sheet material. The sheet material passes through the track pressure bonding equipment, on the one hand, removes part of the water, additives and other small molecular additives under heating conditions to avoid excessive additives affecting the dielectric properties of the material; on the other hand, simultaneously performs planar pressure to make the PTFE prepreg thickness more uniform and flat; then the roller pressing and track pressure bonding process is repeated to obtain the PTFE continuous prepreg.

[0032] In the embodiment, the copper cladding device 30 comprises a copper foil conveying mechanism 31, a track pressing and sintering mechanism 32 and a roller pressing and traction guiding mechanism 33. After the PTFE continuous prepreg comes out of the pressing and baking device, the copper foil conveying mechanism 31 lays copper foils on both sides of the PTFE continuous prepreg, and then the track pressing and sintering mechanism 32 is entered to be pressed and sintered, so that the copper foils are laminated with the PTFE continuous prepreg. After the pressing and sintering, the roller pressing and traction guiding mechanism 33 is entered to be properly pressed and tractioned, and the complete PTFE copper clad plate is obtained.

[0033] In the embodiment, the copper cladding device 30 is further provided with a shearing device 40 on the discharging side. The shearing device 40 can cut the complete PTFE copper clad plate into the required specifications and discharge. It should be noted that the shearing device 40 can be a slicing machine or a cutting machine, and the specific structure of the slicing machine or the cutting machine is not described here.

[0034] In the embodiment, the raw material (PTFE demulsification blank) is formed by the extrusion device, and then the PTFE continuous prepreg is formed by the pressing and baking, and then the copper cladding, slicing, the whole process is a continuous production and processing process, compared with the intermittent production mode in the prior art, the production efficiency is improved.

[0035] Based on the same inventive concept, the application also provides a method for preparing a PTFE copper clad plate by using the above-mentioned PTFE copper clad plate production system, which comprises the following steps:

[0036] (1) injecting the PTFE demulsification blank into the extrusion device for extrusion forming;

[0037] (2) conveying the extrusion-formed PTFE blanks to the pressing and baking device, pressing the PTFE blanks into an integral and continuous PTFE sheet, and baking and pressing the PTFE sheet into a PTFE continuous prepreg;

[0038] (3) conveying the PTFE continuous prepreg to the copper cladding device, laminating the PTFE continuous prepreg with copper foils, and simultaneously completing the sintering of the PTFE to obtain the PTFE copper clad plate;

[0039] (4) cutting and packaging the continuous PTFE copper clad plate.

[0040] In the embodiment, the PTFE demulsification blank is injected into the extrusion device before preheating the extrusion device before extrusion molding. The extruder 11 is preheated to a temperature of 30-50°C, and part of the liquid in the material is removed by preheating the extruder 11. This temperature setting is a preheating condition that does not affect the performance of the PTFE material, and the subsequent baking temperature range can be reached faster. It should be noted that the injection of the PTFE demulsification blank can be performed by an injection pump, which injects the PTFE demulsification blank in the raw material barrel into the extruder. Of course, other injection methods can also be used.

[0041] In the embodiment, the pressure of the roller press and the belt press during the pressure baking process of the PTFE material after extrusion molding can be 1-2 MPa. If the pressure is too small, the material cannot be compacted, multiple PTFEs cannot be pressed into a single layer, or the PTFE can be layered during subsequent processing. If the pressure is too high, the material can be cracked or overflowed, and the PTFE sheet with moderate thickness and integrity needs to be pressed. The PTFE material can obtain a good prepreg under a pressure of 1-2 MPa. The speed of the belt is 0.5-2 m / min. By setting the speed of the belt to 0.5-2 m / min, the speed is too slow to affect the production capacity, and the speed is too fast to cause unstable material transportation, thereby affecting the performance of the copper-coated product. At the same time, drying and copper coating require a long time, so a suitable speed is used to ensure that the material passes through the belt press to complete the drying and copper coating process. The baking temperature is set to 270-300°C. The temperature control in the range of 270-300°C can complete the pre-sintering of the PTFE material, give it higher mechanical properties, and obtain a prepreg. Pre-shrinking can also be achieved, which reduces the thermal shrinkage mismatch problem when the copper foil is pressed, and is beneficial to the subsequent pressing with the copper foil.

[0042] In the embodiment, the continuous PTFE prepreg and the copper foil are combined by applying temperature and pressure to the belt, and the PTFE sintering process is completed at the same time. The pressure is 2-8 MPa, and the sintering temperature is 360-400°C. The continuous PTFE copper-clad plate is cut and packaged.

[0043] The method for preparing a PTFE copper-clad plate provided by the present application is further explained and described below through specific preparation examples.

[0044] Example 1

[0045] Three extruders with the same specifications are arranged vertically and spaced apart, the end of the three-stage cavity of the extruder is flat, each extruder is micro-heated and heated to 30°C, then the PTFE demulsification embryo material is injected into the extruder and extruded into a flat strip. Three flat strips of PTFE material are stacked and transported to the roller press, the pressure of the roller press is 1MPa, the speed of the track pressing equipment is 0.5m / min, the baking temperature is 270°C, the PTFE sheet material is rolled, baked and surface pressed to form a continuous PTFE prepreg, which is transported to the copper cladding equipment, temperature and pressure are applied on the track, the applied pressure is 2MPa and the temperature is 380°C, the continuous PTFE prepreg is combined with the copper foil, then the continuous PTFE copper-clad plate is cut to obtain a finished product with a thickness of 360 microns.

[0046] Example 2

[0047] Three extruders with the same specifications are arranged vertically and spaced apart, the end of the three-stage cavity of the extruder is flat, each extruder is micro-heated and heated to 30°C, then the PTFE demulsification embryo material is injected into the extruder and extruded into a flat strip. Three flat strips of PTFE material are stacked and transported to the roller press, the pressure of the roller press is 1MPa, the speed of the track pressing equipment is 0.5m / min, the baking temperature is 270°C, the PTFE sheet material is rolled, baked and surface pressed to form a continuous PTFE prepreg, which is transported to the copper cladding equipment, temperature and pressure are applied on the track, the applied pressure is 2MPa and the temperature is 380°C, the continuous PTFE prepreg is combined with the copper foil, then the continuous PTFE copper-clad plate is cut to obtain a finished product with a thickness of 360 microns.

[0048] Example 3

[0049] Three extruders with the same specifications are arranged vertically and spaced apart, the end of the three-stage cavity of the extruder is flat, each extruder is micro-heated and heated to 30°C, then the PTFE demulsification embryo material is injected into the extruder and extruded into a flat strip. Three flat strips of PTFE material are stacked and transported to the roller press, the pressure of the roller press is 1MPa, the speed of the track pressing equipment is 0.5m / min, the baking temperature is 270°C, the PTFE sheet material is rolled, baked and surface pressed to form a continuous PTFE prepreg, which is transported to the copper cladding equipment, temperature and pressure are applied on the track, the applied pressure is 2MPa and the temperature is 380°C, the continuous PTFE prepreg is combined with the copper foil, then the continuous PTFE copper-clad plate is cut to obtain a finished product with a thickness of 360 microns.

[0050] Example 4

[0051] Three extruders with the same specifications are arranged vertically and spaced apart, the end of the three-stage cavity of the extruders is flat, each extruder is micro-heated and heated to 50 DEG C, then the PTFE breaking embryo material is injected into the extruder and extruded into a flat strip. Three flat PTFE materials are stacked and transported to the roller press in the press and baking device, the pressure of the roller press is 2 MPa, the speed of the press device is 2 m / min, and the baking temperature is 300 DEG C. The PTFE sheet material is rolled, baked and surface pressed to form a continuous PTFE prepreg, which is transported to the copper cladding device. Temperature and pressure are applied on the track, the applied pressure is 6 MPa, and the temperature is 380 DEG C. The continuous PTFE prepreg is combined with the copper foil, and then the continuous PTFE copper clad plate is cut to obtain a finished product with a thickness of 270 microns.

[0052] Example 5

[0053] Three extruders with the same specifications are arranged vertically and spaced apart, the end of the three-stage cavity of the extruders is flat, each extruder is micro-heated and heated to 50 DEG C, then the PTFE breaking embryo material is injected into the extruder and extruded into a flat strip. Three flat PTFE materials are stacked and transported to the roller press in the press and baking device, the pressure of the roller press is 2 MPa, the speed of the press device is 2 m / min, and the baking temperature is 300 DEG C. The PTFE sheet material is rolled, baked and surface pressed to form a continuous PTFE prepreg, which is transported to the copper cladding device. Temperature and pressure are applied on the track, the applied pressure is 6 MPa, and the temperature is 380 DEG C. The continuous PTFE prepreg is combined with the copper foil, and then the continuous PTFE copper clad plate is cut to obtain a finished product with a thickness of 270 microns.

[0054] In summary, the present application provides a PTFE copper clad plate production system and a method for preparing a PTFE copper clad plate, wherein the production system comprises an extrusion device, a press and baking device, and a copper cladding device; the press and baking device is arranged on the discharge side of the extrusion device, and the copper cladding device is arranged on the discharge side of the press and baking device; the extrusion device is used for extruding PTFE breaking embryo material; the press and baking device is used for stacking and pressing the extruded PTFE materials and baking them into a continuous PTFE prepreg; and the copper cladding device is used for combining copper foil with the continuous PTFE prepreg. By using the extrusion device, the PTFE breaking embryo material can be continuously extruded, the extruded PTFE materials are transported to the press and baking device, the multiple layers are stacked and pressed to form a whole and are baked, a continuous PTFE prepreg is formed, and the continuous PTFE prepreg is transported to the copper cladding device for copper cladding to obtain a PTFE copper clad plate. The system has a simple structure and can continuously produce PTFE copper clad plates, thereby improving the production efficiency of PTFE copper clad plates.

[0055] It is to be understood that the application is not limited to the examples described above, which can be modified or adapted in several ways by those skilled in the art without departing from the scope of the present application, as defined by the appended claims.

Claims

1. A PTFE copper clad plate production system, characterized in that, The PTFE copper-clad plate production system comprises: an extruding device, a pressing and baking device and a copper-clad device; the pressing and baking device is arranged at the discharging side of the extruding device, and the copper-clad device is arranged at the discharging side of the pressing and baking device; the extruding device is used for extruding PTFE breaker embryo into a strip-shaped PTFE material or a flat-shaped PTFE material; when the strip-shaped PTFE material is obtained, the strip-shaped PTFE material is pressed into a flat-shaped PTFE material by a roller pressing device; the pressing and baking device is used for pressing and baking the extruded PTFE material into a PTFE continuous prepreg; and the copper-clad device is used for cladding the PTFE continuous prepreg with a copper foil and simultaneously completing PTFE sintering to obtain the PTFE copper-clad plate. The extruding device comprises a plurality of extruders, and each extruder comprises a gradient cavity and a plurality of concentric extrusion rods. The gradient cavity comprises a first-order cavity, a second-order cavity and a third-order cavity, and the diameters of the cavities are gradually reduced; the lengths of the cavities are gradually increased along the extrusion direction of the PTFE breaker embryo.

2. The PTFE copper clad plate production system according to claim 1, wherein, The feeding end of the second-order cavity is fixedly connected with the discharging end of the first-order cavity, the feeding end of the third-order cavity is fixedly connected with the discharging end of the second-order cavity, and the discharging port of the third-order cavity is flat-shaped or circular; when the discharging port is circular, a roller pressing device is arranged at the discharging end of each extruder to press the strip-shaped PTFE material into a flat-shaped PTFE material.

3. A method for producing a PTFE copper clad plate using the PTFE copper clad plate production system according to claim 1, characterized by, The gradient extrusion process is as follows: the three concentric extrusion rods extrude the raw material to the end of the first-order cavity, then the middle rod and the small rod extrude the raw material to the end of the second-order cavity, and finally the small rod extrudes the raw material from the third-order cavity. The PTFE copper-clad plate production system further comprises a shearing device arranged at the discharging side of the copper-clad device. The PTFE copper-clad plate production system comprises: an extruding device, a pressing and baking device and a copper-clad device; the pressing and baking device is arranged at the discharging side of the extruding device, and the copper-clad device is arranged at the discharging side of the pressing and baking device; 4. The method of producing a PTFE copper-clad plate according to claim 3, wherein the extruding device is used for extruding PTFE breaker embryo into a strip-shaped PTFE material or a flat-shaped PTFE material; when the strip-shaped PTFE material is obtained, the strip-shaped PTFE material is pressed into a flat-shaped PTFE material by a roller pressing device; 5. The method of producing a PTFE copper-clad plate according to claim 3, wherein the pressing and baking device is used for pressing and baking the extruded PTFE material into a PTFE continuous prepreg; and 6. The method of producing a PTFE copper-clad plate according to claim 3, wherein the copper-clad device is used for cladding the PTFE continuous prepreg with a copper foil and simultaneously completing PTFE sintering to obtain the PTFE copper-clad plate.

7. The method of producing a PTFE copper-clad plate according to claim 3, wherein The extruding device comprises a plurality of extruders, and the step of injecting the PTFE breaker embryo into the extruding device and extruding the PTFE breaker embryo into a flat-shaped PTFE material or a strip-shaped PTFE material further comprises preheating the extruders, and the preheating temperature is 30-50℃.

8. The method of producing a PTFE copper-clad plate according to claim 4, wherein The step of delivering the extruded PTFE material to the pressing and baking device and pressing the PTFE material into a continuous PTFE material further comprises that the pressure of the pressing and baking device is 1-2MPa. The step of baking the PTFE material into a PTFE continuous prepreg further comprises that the baking temperature is 270-300℃. The step of delivering the PTFE continuous prepreg to the copper-clad device, cladding the PTFE continuous prepreg with a copper foil and simultaneously completing PTFE sintering further comprises that the pressure is 2-8MPa and the sintering temperature is 360-400℃. The extruding amounts of the extruders are the same.

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