CN111251692A - Production process and equipment of high-frequency high-speed LCP copper-clad plate - Google Patents
Production process and equipment of high-frequency high-speed LCP copper-clad plate Download PDFInfo
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- CN111251692A CN111251692A CN202010070165.1A CN202010070165A CN111251692A CN 111251692 A CN111251692 A CN 111251692A CN 202010070165 A CN202010070165 A CN 202010070165A CN 111251692 A CN111251692 A CN 111251692A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B39/00—Layout of apparatus or plants, e.g. modular laminating systems
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Abstract
The invention provides a device and a process for producing a high-frequency high-speed LCP copper-clad plate, wherein the device comprises: a screw extruder; the two copper foil unwinding mechanisms are used for driving the copper foil to unwind; at least one hot-pressing roller group, wherein each hot-pressing roller group comprises two hot-pressing rollers which are oppositely arranged; the LCP resin is melted by a screw extruder and then extruded and cast onto the copper foil between two hot pressing rollers which are arranged side by side, and the molten LCP resin and the copper foil are compounded by the hot pressing roller set in a hot pressing way to form a copper-clad plate; during compounding and after-finishing, a protective film is pasted outside the copper foil, and the copper foil is stripped before the coated copper is rolled; at least one after-finishing unit, each of which comprises at least two groups of after-finishing hot-pressing rollers and two groups of cooling rollers, and is symmetrically distributed on two sides of the copper-clad plate; and a finished product winding mechanism for winding the cooled copper-clad plate; the invention overcomes the process limitation that the copper-clad plate can be produced only by film-forming the LCP resin, and improves the production speed and the product quality of the copper-clad plate.
Description
Technical Field
The invention relates to a production technology of a copper-clad plate material in the technical field of 5G, in particular to a production process and equipment of a high-frequency high-speed LCP copper-clad plate material.
Background
Compared with the 1G-4G communication technology, the 5G communication equipment has higher frequency and higher transmission speed, thereby providing higher and stricter requirements on technical indexes such as dielectric constant, dielectric loss factor and the like of electronic materials used by the equipment. The traditional epoxy-based copper clad laminate and polyimide-based copper clad laminate cannot meet the electrical performance requirement required by 5G high-frequency communication. The Liquid-Crystal Polymer (LCP) high Polymer material has the characteristics of extremely low dielectric constant and dielectric loss factor, low moisture absorption, good chemical resistance, high gas barrier property and the like, so that the LCP high Polymer material becomes the most important basic material for producing the copper-clad plate in the 5G era.
In the prior art, the method for manufacturing the copper-clad plate by using the LCP material generally comprises the steps of firstly preparing LCP resin into a film, and then hot-pressing and compounding the film-formed LCP resin and copper foil to prepare the copper-clad plate. The Flexible Printed Circuit (FPC) is manufactured by a Flexible board manufacturer by using a copper-clad plate and other production materials, and finally, the FPC Flexible board is manufactured into an antenna module by an antenna module manufacturer according to different antenna designs and supplied to manufacturers such as mobile phone terminals.
The LCP material has the unique physical and chemical properties of crystal and high molecular material, so that the film forming is very difficult, and the requirements on film forming equipment and process are very strict, so that the LCP resin has extremely high film forming production difficulty and high price. At present, only a few manufacturers in Japan and America can effectively provide commercialized LCP films, strict export restriction is implemented, the urgent requirement of the downstream on LCP copper-clad plates is severely restricted, and at present, no qualified manufacturer capable of providing LCP films exists in China, so that great material restriction and technical hidden danger exist in the 5G technical industrialization promotion process in China.
Disclosure of Invention
In view of the above, the invention provides a production process and equipment of a high-frequency high-speed LCP copper-clad plate, which overcome the process limitation that in the prior art, an LCP material needs to be firstly formed into a film and then is subjected to hot-pressing compounding with a copper foil in the production process of the LCP copper-clad plate, and improve the production speed of the copper-clad plate. Meanwhile, the invention also aims at the characteristics of the LCP material, so that the two surfaces of the LCP resin which is contacted with the copper foil in the whole production process can realize stable and consistent production process conditions, thereby ensuring the uniform and consistent bonding performance of the LCP resin and the copper foil and avoiding the aggravation of the anisotropy of the LCP resin caused by temperature difference.
According to one aspect of the invention, the invention provides a high-frequency high-speed LCP copper-clad plate production device, which comprises the following components in the transmission direction of materials:
a screw extruder;
the two copper foil unwinding mechanisms are used for unwinding the copper foils;
the two protective film unwinding mechanisms are used for unwinding the protective films;
the hot pressing roller set comprises at least one hot pressing roller set, and each hot pressing roller set comprises two hot pressing rollers which are symmetrically arranged; two hot pressing rollers contained in each hot pressing roller set are symmetrically arranged side by side; copper foils discharged by the copper foil unwinding mechanism are arranged on the two hot pressing rollers of the first hot pressing roller group; the screw extruder melts LCP resin and extrudes the LCP resin to the copper foil between the parallel hot-pressing roller sets;
the hot pressing roller group is driven by a transmission mechanism to thermally press the LCP resin and the copper foil to form a copper-clad plate coated with a protective film;
the post-finishing unit comprises at least two groups of hot-pressing finishing roller sets and at least two groups of cooling roller sets; the hot-pressing finishing roller group is a heating roller and is used for further hot-pressing finishing of the copper-clad plate; the cooling roller set is used for cooling the copper-clad plate; each hot-pressing finishing roller set comprises two heating rollers, and the heating rollers in each hot-pressing finishing roller set are symmetrically distributed on two sides of the copper-clad plate; each cooling roller set comprises two cooling rollers, and the cooling rollers in each cooling roller set are symmetrically distributed on two sides of the copper-clad plate;
and a finished product winding mechanism for winding the cooled copper-clad plate.
Preferably, the temperature of the hot-pressing roller in the hot-pressing roller group is less than the critical phase separation temperature T of the LCP materialcAnd is greater than the melting point temperature T of the LCP materialm。
Preferably, the screw extruder comprises a hopper and a barrel which are communicated, the LCP material is added from the hopper and enters the barrel for heating; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three temperature zones are sequentially arranged between the charging opening and the nozzle along the transmission direction of the LCP material; the temperatures of the three temperature zones are strictly controlled and gradually increased; the temperature of the nozzle is lower than that of the third temperature zone of the three temperature zones.
Preferably, the screw extruder is provided with a nozzle capable of precisely controlling flow, the nozzle and the hot-pressing roller group are arranged in a protective cover which is sealed relatively, and nitrogen is filled in the protective cover; the nitrogen in the protective cover keeps micro-positive pressure, so that air can be effectively discharged, and the quality of the peripheral air cannot be influenced; the screw extruder passes through penetrate the mouth and extrude LCP resin melt, penetrate the mouth and exist certain distance of predetermineeing with the part that two hot pressing roller contact, and be located two hot pressing roller contact site directly over. To ensure a smooth change in the temperature of the LCP resin, the predetermined distance should be as small as possible.
Preferably, the two copper foil unwinding mechanisms are provided, and the LCP resin on the surface of the copper foil is extruded from the nozzle and then flows to the position between the two layers of copper foils for hot pressing.
Preferably, the device further comprises two protective film unwinding mechanisms and two protective film winding mechanisms, wherein the protective film unwinding mechanisms are used for driving the protective films to unwind and roll; the copper foil is positioned between two layers of protective films and is in press fit with the LCP material and the protective films to form the copper-clad plate with the protective films on the surface; the protective film winding mechanism is used for stripping and winding the protective film from the surface of the copper-clad plate; the protective film and the protective cover are filled with nitrogen gas to protect the copper foil from being oxidized due to contact with air at high temperature.
Preferably, a temperature detection and control device is arranged in the protective cover, and the temperature in the protective cover is controlled to be the melting point temperature T of the LCP materialmAbove, but below the critical phase separation temperature Tc。
Preferably, the nozzle temperature is higher than TcThe LCP material extruded from the nozzle is isotropic liquid polymer; the LCP material is extruded and then stacked on the copper foil between the two hot pressing rollers; the hot pressing roller is driven by a motor to rotate, and LCP molten resin and copper foil are pressed; the temperature of the hot pressing roller is controlled to be TmAbove, but less than Tc. And the LCP molten resin and the copper foil are laminated to obtain the LCP copper-clad plate.
Preferably, the set of afterfinish rollers comprises at least four sets of press rollers. At least two groups of press rolls are heating rolls, and the roll surface temperature is controlled at TmAnd TcIn the meantime. The LCP material is in a molten state when passing through the compression roller, and LCP molten resin is uniformly extruded towards two sides under the compression of the hot-pressing roller, so that the transverse stretching effect is achieved. And at least two groups of compression rollers are cooling rollers, the temperature of the cooling roller group is set to be gradually reduced, and the copper-clad plate is gradually cooled to the required temperature. And the cooled copper-clad plate is stripped and rolled from the surface of the copper-clad plate by the protective film rolling mechanism.
Preferably, a thickness measuring mechanism is arranged between the cooling roller group and the finished product winding mechanism, and signals of the thickness measuring mechanism are transmitted to a central control system of the whole device; the thickness measuring mechanism is used for measuring the thickness of the copper clad plate; the screw extruder adjusts the amount of LCP resin extruded by the nozzle in unit time according to the measurement result of the thickness measurement mechanism, and the hot-pressing roller group adjusts the rolling speed and pressure of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
Preferably, the device further comprises two trimming scrapers, wherein the two trimming scrapers are positioned between the cooling roller set and the finished product winding mechanism and are symmetrically distributed on two sides of the copper-clad plate; the trimming scraper is used for trimming the copper-clad plate before rolling and cutting off the part of the edge of the copper-clad plate with apparent defect.
Preferably, the heat and pressure roller is an electromagnetic induction heating roller.
Preferably, the electromagnetic induction heating roller can provide a heating temperature of 280-450 ℃, and the temperature precision is controlled within +/-1.5 ℃.
According to another aspect of the invention, the invention provides a production process of a high-frequency high-speed LCP copper-clad plate, which adopts the production device for producing the copper-clad plate and comprises the following steps:
s10: conveying the LCP resin slices into a screw extruder, and heating to melt the LCP resin slices;
s20: controlling a copper foil unreeling mechanism to drive copper foil to a hot pressing roller;
s30: controlling the screw extruder to extrude the molten LCP resin to the middle of the copper foil symmetrically distributed in the middle of the hot pressing roller set;
s40: controlling the hot-pressing roller group to press the LCP resin and the copper foil to form a copper-clad plate;
s50: controlling an after-finishing roller set and a cooling roller set to carry out after-finishing and cooling on the copper-clad plate;
s60: controlling the protective film rolling mechanism to peel and roll the protective film from the surface of the copper-clad plate;
s70: and controlling a finished product winding mechanism to wind the cooled copper-clad plate.
Preferably, the temperature of the hot-pressing roller in the hot-pressing roller group is less than the critical phase separation temperature T of the LCP materialcAnd is greater than the melting point temperature T of the LCP materialm。
Preferably, the screw extruder comprises a hopper and a barrel which are communicated, the LCP material is added from the hopper and enters the barrel for heating; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three temperature zones are sequentially arranged between the charging opening and the nozzle along the transmission direction of the LCP resin; the temperatures of the three temperature zones are strictly controlled and gradually increased; the temperature of the nozzle is lower than that of the third temperature zone of the three temperature zones.
Preferably, the screw extruder is provided with a nozzle capable of precisely controlling flow, the nozzle and the hot-pressing roller group are arranged in a protective cover which is sealed relatively, and nitrogen is filled in the protective cover; the nitrogen in the protective cover keeps micro-positive pressure, so that air can be effectively discharged, and the quality of the peripheral air cannot be influenced; the screw extruder passes through penetrate the mouth and extrude LCP resin melt, it has a preset distance with the part that two hot press rolls contacted to penetrate the mouth, and is located two hot press roll contact site directly over.
Preferably, the two copper foil unwinding mechanisms are provided, and the LCP resin on the surface of the copper foil is extruded from the nozzle and then flows to the position between the two layers of copper foils for hot-press compounding.
The step S10 further includes: the temperature of the nozzle is controlled to be higher than TcThe LCP resin extruded from the nozzle is an isotropic liquid LCP.
The step S20 further includes: controlling the protective film unwinding mechanism to drive the protective film to unwind and roll; the copper foil is positioned between two layers of protective films and is pressed with the LCP resin and the protective films to form the copper-clad plate with the protective films on the surface; the protective film winding mechanism is used for stripping and winding the protective film from the surface of the copper-clad plate;
the step S30 further includes: a temperature detection and control device is arranged in the protective cover, and the temperature in the protective cover is controlled to be the melting point temperature T of the LCP resinmAbove, but below the critical phase separation temperature Tc. The protective film and the protective cover are filled with nitrogen gas to protect the copper foil from being oxidized due to contact with air at high temperature.
The step S40 further includes: the LCP resin is extruded and then is stacked on the copper foil between the two hot-pressing rollers; the hot pressing roller is driven by a motor to rotate to press the LCP molten resin and the copper foilCombining; the temperature of the hot pressing roller is controlled to be TmAbove, but less than Tc. And carrying out hot-pressing on the LCP molten resin and the copper foil to obtain the LCP copper-clad plate.
The step S50 further includes: the after-finishing roller group comprises at least four groups of press rollers. At least two groups of press rolls are heating rolls, and the roll surface temperature is controlled at TmAnd TcIn the meantime. The LCP material is in a molten state when passing through the compression roller, and plays a role in transverse stretching under the hot pressing of the compression roller. And at least two groups of compression rollers are cooling rollers, the temperature of the cooling roller group is set to be gradually reduced, and the copper-clad plate is gradually cooled to the required temperature.
The step S60 further includes:
a thickness measuring mechanism is arranged between the cooling roller set and the finished product winding mechanism, and signals of the thickness measuring mechanism are transmitted to a central control system of the whole set of production device; the thickness measuring mechanism is used for measuring the thickness of the copper clad plate; the screw extruder adjusts the amount of LCP molten resin extruded by the nozzle in unit time according to the measurement result of the thickness measurement mechanism, and the hot-pressing roller group adjusts the rolling speed and pressure of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
The step S60 further includes:
the device also comprises two trimming scrapers, wherein the two trimming scrapers are positioned between the cooling roller set and the finished product winding mechanism and distributed on two sides of the copper-clad plate; the trimming scraper is used for trimming the copper-clad plate before rolling and cutting off the part of the edge of the copper-clad plate with apparent defect.
Compared with the prior art, the invention has the beneficial effects that:
the production device and the production process of the high-frequency high-speed LCP copper-clad plate provided by the invention have the advantages that LCP resin is heated and melted, and is directly cast between two layers of copper foils, and then the LCP melted resin in the middle state and the copper foils are pressed at high temperature through the symmetrical hot-pressing roller sets to form the LCP copper-clad plate; the process limitation that the copper-clad plate can be manufactured by laminating only by film forming of the LCP resin in the prior art is overcome, and the temperature change of the LCP resin in the process of casting onto the copper foil is uniform and consistent, so that the performance consistency of the LCP resin and the two layers of copper foils in hot pressing is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of an LCP copper-clad plate production device disclosed by the embodiment of the invention;
FIG. 2 is a schematic view of the thermal compounding of LCP material with copper foil after melt extrusion;
FIG. 3 is a schematic structural diagram of an LCP copper-clad plate with a protective film after being compounded;
FIG. 4 is a schematic structural diagram of a screw extruder in an LCP copper-clad plate production device;
FIG. 5 is a schematic structural diagram of an LCP copper-clad plate disclosed by the embodiment of the invention;
FIG. 6 is a schematic representation of the trend of the shape change of a liquid LCP material extruded through a nozzle;
FIG. 7 is a graph of temperature versus viscosity for LCP materials;
FIG. 8 is a schematic view of a production process flow of a copper-clad plate disclosed in the embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, materials, devices, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising," "having," and "providing" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
As shown in figure 1, the invention discloses a copper-clad plate production device, which is used for heating and melting LCP materials 301, and then compounding the melted LCP materials with copper foils through high-temperature hot pressing to manufacture the LCP copper-clad plates. Along the transmission direction of the copper foil, the device comprises a screw extruder 101, two copper foil unwinding mechanisms 102, two protective film unwinding mechanisms 103, at least one hot press roller set 104, at least one after-treatment unit 106, two protective film winding mechanisms 111 and a finished product winding mechanism 113.
In this embodiment, the protection film unreeled by the protection film unreeling mechanism 103 is a PI (Polyimide) film. The number of the copper foil unwinding mechanism 102, the number of the protective film unwinding mechanism 103, and the number of the protective film winding mechanism 111 are two, and the number of the hot press roller sets 104 is one, but the present application does not limit the number of all the mechanisms and the hot press roller sets 104, and the type of the copper foil.
The copper foil unwinding mechanism 102 is used for driving the copper foil 302 to unwind and roll. The protective film unwinding mechanism 103 is used for driving the protective film to unwind and roll, and the protective film winding mechanism 111 is used for peeling and winding the protective film from the surface of the copper-clad plate. The protective films 303 are respectively coated on the outer surfaces of the two layers of copper foil 302, so that the copper foil 302 can be prevented from being oxidized in a high-temperature environment and the copper foil 302 can be prevented from being damaged.
Each of the hot press roller sets 104 includes two oppositely disposed hot press roller setsAnd hot press rollers 105, wherein the hot press rollers 105 in each hot press roller group 104 are symmetrically distributed on two sides of the copper foil 302 in the process of travelling. The screw extruder 101 melts the LCP material 301 and extrudes it to the surface of the copper foil 302 between the two hot press rolls 105, and the temperature of the surface of the hot press rolls 105 is controlled to be the melting point temperature T of the LCP resin 301mTemperature T of separation from critical phasecAnd the LCP resin 301 and the copper foil 302 are hot-pressed and compounded by rotating under the driving of a transmission mechanism.
The molten LCP resin 301 just extruded from the nozzle 406 is not in the form of a regular film, but is in the form of a liquid LCP material 201, the shape of which is shown in fig. 6. The viscosity of the LCP material decreases with increasing temperature, and exhibits a non-linear relationship as shown in fig. 7. Wherein, TmTo the melting temperature, TcThe critical phase separation temperature. Higher than TcIn this case, the viscosity of the molten LCP resin is low, and the resin is not easily molded. Below TmIn the case of LCP resins, they are solid and are not easy to process. And T of many LCP materialsmAnd TcOften, the difference is not great, therefore, in the invention, the temperature of the processing technology needs to be accurately controlled to be T through a high-end heating devicemAnd TcAt a specified temperature in between.
The LCP material 201 extruded from the nozzle 406 has a small amount of accumulation on the surface of the copper foil, and its temperature is higher than the melting temperature T of the LCP resinmBut below its critical phase separation temperature Tc. Therefore, the LCP molten resin 301 just laminated between the copper foils 302 is not regularly film-shaped, and further hot press molding and cooling treatment by the finishing unit 106 are required. Specifically, as shown in fig. 3, the copper-clad plate subjected to hot-pressing compounding by the hot-pressing roller set 104 still has protective films 303 on both sides, and enters the post-finishing unit 106 under the driving of the transmission mechanism. The finishing unit 106 comprises at least 2 groups (2 in each group) of finishing hot-press rolls 107, the roll surface temperature of which is also controlled at TmAnd TcMeanwhile, the LCP material 301 is in a molten state when the copper-clad plate passes through, and meanwhile, the post-finishing hot-pressing roller 107 can adjust the pressing force under the action of a control system of the whole production device according to the measurement data of the thickness measuring instrument 109 so as to finely adjust the thickness of the LCP material.
Specifically, when the actual thickness of the copper-clad plate measured by the thickness measuring mechanism is larger than the designed thickness of the copper-clad plate, the screw extruder 101 is controlled to reduce the amount of LCP material extruded by the nozzle 406 in unit time, and the production device controls the hot-press roller group to increase the rolling speed of the hot-press roller 105. When the actual thickness of the copper-clad plate measured by the thickness measuring mechanism is smaller than the designed thickness of the copper-clad plate, the screw extruder 101 is controlled to increase the amount of LCP material extruded by the nozzle 406 in unit time, and the production device controls the hot-pressing roller group to reduce the rolling speed of the hot-pressing roller 105.
The LCP molten resin is pressed to both sides by the finishing heat and pressure roll 107, and acts as a lateral stretching. After the hot pressing of aftertreatment hot-pressing roller 107, LCP copper clad laminate thickness obtains accurate control, and the adhesion force of LCP molten resin 301 and copper foil 302 obtains the reinforcing, through aftertreatment chill roll 108 under drive mechanism drives, under the effect of at least two sets of aftertreatment chill roll 108, LCP copper clad laminate is cooled down. The LCP copper clad laminate surface coming out of the post-finishing unit 106 also has a protective film, which is peeled off and wound by the protective film winding mechanism 111. And the finished product winding mechanism 113 winds and rolls the copper-clad plate after the protective film is peeled off, so that the preparation of the copper-clad plate is completed. The final manufactured LCP copper clad laminate structure is shown in fig. 5, and the copper clad laminate includes two layers of copper foils 302 and an LCP film 301 located between the two layers of copper foils 302.
As shown in FIG. 4, in this embodiment, the screw extruder 101 comprises a hopper 401 and a cylinder which are communicated with each other, and the LCP material 301 is fed from the hopper 401 into the cylinder and heated. The two ends of the charging barrel are respectively provided with a charging opening 402 and a nozzle 406, and along the transmission direction of the LCP material 301, three temperature zones are sequentially arranged between the charging opening 402 and the nozzle 406, namely a first temperature zone 403, a second temperature zone 404 and a third temperature zone 405. Moreover, the temperature of the three temperature zones gradually rises, and the temperature of the nozzle 406 is equivalent to the temperature of the second temperature zone of the three temperature zones and is lower than the temperature of the third temperature zone of the three temperature zones. That is, the temperature of the nozzle 406 is equal to the temperature of the second temperature zone 404 and less than the temperature of the third temperature zone 405, so as to ensure that the LCP resin 301 is extruded in an optimal state, which is convenient for the hot press roller set 104 to perform hot press lamination with the copper foil 302. Illustratively, the temperature of the charging port 402 is 60 ℃, the temperature of the first temperature zone 403 is 310 ℃, the temperatures of the second temperature zone 404 and the nozzle 406 are 335 ℃, and the temperature of the third temperature zone 405 is 345 ℃.
In this embodiment, the nozzle 406 and the hot press roll set 104 are both located in a nitrogen-filled protective cover, so that the surface oxidation of the heated copper foil 302 can be prevented. The nozzle 406 needs to have a precise temperature control function, and the temperature error of the nozzle 406 is controlled within ± 1.5 ℃.
In this embodiment, the apparatus for producing a copper-clad plate further comprises two trimming scrapers 112, wherein the two trimming scrapers 112 are located between the thickness measuring instrument 109 and the finished product winding mechanism 113 and symmetrically distributed on two sides of the copper-clad plate; the trimming scraper 112 is used for trimming the copper-clad plate before rolling and cutting off the apparent defect part at the edge of the copper-clad plate.
In this embodiment, the apparatus for producing copper clad laminate comprises a plurality of guide rollers 110 for changing the transmission direction of the copper foil 302, the protective film 303 or the LCP copper clad laminate.
In this embodiment, the hot press roller 105 is a high-precision electromagnetic induction heating roller, which can realize accurate control of the temperature of the hot press roller 105 and ensure uniform surface temperature of the hot press roller 105, so that the copper foil 302 can be uniformly heated.
In another embodiment of the present invention, the hot press roller 105 is a high precision electric heating roller, which can provide a high temperature of 300-500 ℃, the temperature precision can be controlled within ± 1.5 ℃, and the mechanical deformation can be controlled within ± 10 μm at the working temperature. However, the present application does not limit the type of the heat and pressure roller 105.
As shown in fig. 8, the embodiment of the invention also discloses a LCP copper-clad plate production process, which adopts the copper-clad plate production apparatus disclosed in any of the above embodiments to produce a copper-clad plate, and the production process comprises the following steps:
s10: conveying the LCP resin slices into a screw extruder, and heating to melt the LCP resin slices;
s20: controlling a copper foil unreeling mechanism to drive copper foil to a hot pressing roller;
s30: controlling the screw extruder to extrude the molten LCP resin to the middle of the copper foil symmetrically distributed in the middle of the hot pressing roller set;
s40: controlling the hot-pressing roller group to press the LCP resin and the copper foil to form a copper-clad plate;
s50: controlling an after-finishing roller set and a cooling roller set to carry out after-finishing and cooling on the copper-clad plate;
s60: controlling the protective film rolling mechanism to peel and roll the protective film from the surface of the copper-clad plate;
s70: and controlling a finished product winding mechanism to wind the cooled copper-clad plate.
Wherein the temperature of the nozzle in the screw extruder is higher than the critical phase separation temperature T of the LCP materialcThe temperature of the hot-pressing rollers in the hot-pressing roller group is lower than the critical phase separation temperature T of the LCP materialcBut above its melting point Tm。
The screw extruder comprises a hopper and a charging barrel which are communicated, and the LCP material is added from the hopper and enters the charging barrel for heating; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three temperature zones are sequentially arranged between the charging opening and the nozzle along the transmission direction of the LCP material; the temperatures of the three temperature zones are strictly controlled and gradually increased; the temperature of the nozzle is lower than that of the third temperature zone of the three temperature zones.
The screw extruder is provided with a nozzle capable of precisely controlling flow, the nozzle and the hot-pressing roller set are arranged in a protective cover which is sealed relatively, and nitrogen is filled in the protective cover; the nitrogen in the protective cover keeps micro-positive pressure, so that air can be effectively discharged, and the quality of the peripheral air cannot be influenced; the screw extruder passes through penetrate the mouth and extrude LCP molten resin, it has a preset distance to penetrate the part that mouth and two hot press rolls contacted, and is located two hot press roll contact site directly over.
The copper foil unwinding mechanisms are two, and the LCP molten resin on the surface of the copper foil is extruded from the nozzle and then flows to the position between two layers of copper foils for hot pressing.
The step S20 further includes: controlling the protective film unwinding mechanism to drive the protective film to unwind and roll; the copper foil is positioned between two layers of protective films and is in press fit with the LCP material and the protective films to form the copper-clad plate with the protective films on the surface; the protective film winding mechanism is used for stripping and winding the protective film from the surface of the copper-clad plate;
the step S30 further includes: a temperature detection and control device is arranged in the protective cover, and the temperature in the protective cover is controlled to be the melting point temperature T of the LCP materialmAbove, but below the critical phase separation temperature Tc. The protective film and the protective cover are filled with nitrogen gas to protect the copper foil from being oxidized due to contact with air at high temperature.
The step S40 further includes: the LCP molten resin is extruded and then is stacked on the copper foil between the two hot-pressing rollers; the hot pressing roller is driven by a motor to rotate, and LCP molten resin and copper foil are compounded in a hot pressing mode; the temperature of the hot pressing roller is controlled to be TmAbove, but less than Tc. And the LCP molten resin and the copper foil are laminated to obtain the LCP copper-clad plate.
The step S50 further includes: the after-finishing roller group comprises at least four groups of press rollers. At least two groups of press rolls are heating rolls, and the roll surface temperature is controlled at TmAnd TcIn the meantime. The LCP material is in a molten state when passing through the compression roller, and is uniformly rolled to two sides under the compression of the hot-pressing roller, so that the transverse stretching effect is achieved. And at least two groups of compression rollers are cooling rollers, the temperature of the cooling roller group is set to be gradually reduced, and the copper-clad plate is gradually cooled to the required temperature.
The step S60 further includes:
the device also comprises two trimming scrapers, wherein the two trimming scrapers are positioned between the cooling roller set and the finished product winding mechanism and distributed on two sides of the copper-clad plate; the trimming scraper is used for trimming the copper-clad plate before rolling and cutting off the part of the edge of the copper-clad plate with apparent defect.
In summary, the LCP copper-clad plate production device and the production process disclosed by the invention have at least the following advantages:
the LCP copper-clad plate production device and the production process provided by the invention have the advantages that LCP materials are heated and melted, and are directly cast between two layers of copper foils, and then LCP molten resin in an intermediate state and the copper foils are pressed at high temperature through a hot-pressing roller set to form the LCP copper-clad plate; the process limitation that the copper-clad plate can be manufactured by laminating only by film forming of the LCP material in the prior art is overcome, and the temperature change of the LCP resin in the process of casting onto the copper foil can be kept consistent, so that the performance consistency of the LCP resin and the two layers of copper foils in hot pressing is ensured.
Compared with the prior art which needs a process of LCP film forming and then laminating, the invention shortens the process flow; the comprehensive energy consumption in the production process is reduced by at least 30 percent; in addition, the invention does not need LCP film forming, and provides a better product production technical scheme for copper-clad plate production enterprises; meanwhile, in the invention, the temperature of the LCP material in the process of processing and forming is accurately controlled, the sensitivity of the LCP resin to temperature change is avoided, the uniform deformation and thickness control in the process of melting and hot-pressing the LCP resin is ensured, the stable thermal compounding with the copper foil is realized, and the quality stability of the product is ensured.
In the description of the present invention, it is to be understood that the terms "bottom", "longitudinal", "lateral", "upper", "lower", "front", "rear", "vertical", "horizontal", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the structures or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more and "several" means one or more unless otherwise specified.
In the description herein, references to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," etc., indicate that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (17)
1. The utility model provides a high frequency high speed LCP copper-clad plate apparatus for producing which characterized in that, along the transmission direction of material, the device includes:
a screw extruder;
the two copper foil unwinding mechanisms are used for unwinding the copper foils;
the two protective film unwinding mechanisms are used for unwinding the protective films;
the hot pressing roller set comprises at least one hot pressing roller set, and each hot pressing roller set comprises two hot pressing rollers which are symmetrically arranged; two hot pressing rollers contained in each hot pressing roller set are symmetrically arranged side by side; copper foils discharged by the copper foil unwinding mechanism are arranged on the two hot pressing rollers of the first hot pressing roller group; the screw extruder melts LCP resin and extrudes the LCP resin to the copper foil between the parallel symmetrical hot-pressing roller sets;
the hot pressing roller group is driven by a transmission mechanism to press the molten LCP resin and the copper foil to form a copper-clad plate coated with a protective film;
the post-finishing unit comprises at least two groups of symmetrical hot-pressing finishing roller sets and at least two groups of cooling roller sets; the hot-pressing finishing roller group is a heating roller and is used for further hot-pressing finishing of the copper-clad plate; the cooling roller set is used for cooling the copper-clad plate; each hot-pressing finishing roller set comprises two symmetrical heating rollers which are symmetrically distributed on two sides of the copper-clad plate; each cooling roller set comprises two cooling rollers, and the cooling rollers in each cooling roller set are symmetrically distributed on two sides of the copper-clad plate;
and a finished product winding mechanism for winding the cooled copper-clad plate.
2. The copper-clad plate production device of claim 1, wherein the temperature of the hot press rolls in the hot press roll group is less than the critical phase separation temperature T of the LCP resincAnd is higher than the melting point temperature T of the LCP resinm。
3. The copper-clad plate production device according to claim 1, wherein the screw extruder comprises a hopper and a barrel which are communicated, the LCP resin is added from the hopper and enters the barrel for heating; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three temperature zones are sequentially arranged between the charging opening and the nozzle along the transmission direction of the LCP resin; the temperatures of the three temperature zones are strictly controlled and gradually increased; the temperature of the nozzle is lower than that of the third temperature zone of the three temperature zones.
4. The apparatus for producing copper-clad plate according to claim 1, wherein the screw extruder has a nozzle capable of precisely controlling the flow rate, the nozzle and the hot press roller set are both disposed in a protective cover which is sealed relatively, and the protective cover is filled with nitrogen; the nitrogen in the protective cover keeps micro-positive pressure, so that air can be effectively discharged, and the surface of the copper foil entering the protective cover is protected from being oxidized in the high-temperature hot-pressing compounding process; the screw extruder passes through penetrate the mouth and extrude LCP resin, penetrate the mouth and exist certain distance of predetermineeing with the part that two hot pressing rolls contacted, and be located two hot pressing roll contact site directly over. To ensure a smooth change in the temperature of the LCP resin, the predetermined distance should be as small as possible.
5. The copper-clad plate production device of claim 1, wherein the copper foil unwinding mechanism comprises two copper foil unwinding mechanisms, and the LCP resin on the surface of the copper foil is extruded from an injection nozzle and then flows to a position between two layers of copper foil for thermocompression bonding.
6. The copper-clad plate production device according to claim 1, further comprising two protective film unwinding mechanisms and two protective film winding mechanisms, wherein the protective film unwinding mechanisms are used for driving the protective films to unwind and roll; the copper foil is positioned between two layers of protective films and is synchronously laminated with the LCP resin and the protective films to form the copper-clad plate with the protective films on the surface; the protective film winding mechanism is used for stripping and winding the protective film from the surface of the copper-clad plate; the protective film and the protective cover are filled with nitrogen gas to protect the copper foil from being oxidized due to contact with air at high temperature.
7. The apparatus for producing copper-clad plate according to claim 4, wherein a temperature detecting and controlling device is provided in the protective cover to control the temperature in the protective cover to the melting point temperature T of LCP resinmAbove, but below the critical phase separation temperature Tc。
8. The copper-clad plate production device of claim 4, wherein the nozzle temperature is higher than TcThe LCP resin extruded from the nozzle is in an isotropic molten state; the LCP resin is extruded and then is stacked on the copper foil between the two hot-pressing rollers; the hot pressing roller is driven by a motor to rotate, and the molten LCP resin and the copper foil are pressed; the temperature of the hot pressing roller is controlled to be TmAbove, but less than Tc. And the LCP resin and the copper foil are laminated to obtain the LCP copper-clad plate.
9. The copper-clad plate production device of claim 1, wherein the after-finishing roller set comprises at least four sets of press rollers. At least two groups of press rollers are heating rollers, the surface temperature of the rollersDegree is controlled at TmAnd TcIn the meantime. LCP resin process be in molten state during the compression roller, the partial LCP resin of pressfitting at the hot pressing roller is extruded and is extended towards both sides, plays horizontal tensile effect. And at least two groups of compression rollers are cooling rollers, the temperature of the cooling roller group is set to be gradually reduced, and the copper-clad plate is gradually cooled to a proper temperature. And the cooled copper-clad plate is stripped and rolled from the surface of the copper-clad plate by the protective film rolling mechanism.
10. The copper-clad plate production device according to claim 1, wherein a thickness measuring mechanism is arranged between the cooling roller group and the finished product winding mechanism, and signals of the thickness measuring mechanism are transmitted to a central control system of the whole device; the thickness measuring mechanism is used for measuring the thickness of the copper clad plate; the screw extruder adjusts the amount of LCP resin extruded by the nozzle in unit time according to the measurement result of the thickness measurement mechanism, and the hot-pressing roller group adjusts the rolling speed and pressure of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
11. The copper-clad plate production device according to claim 1, further comprising two trimming scrapers, wherein the two trimming scrapers are positioned between the cooling roller set and the finished product winding mechanism and symmetrically distributed on two sides of the copper-clad plate; the trimming scraper is used for trimming the copper-clad plate before rolling and cutting off the part of the edge of the copper-clad plate with apparent defect.
12. The copper-clad plate production device of claim 1, wherein the hot press roller is an electromagnetic induction heating roller, the electromagnetic induction heating roller can provide a heating temperature of 280-450 ℃, and the temperature precision is controlled within +/-1.5 ℃.
13. The LCP copper-clad plate production method is characterized in that the LCP copper-clad plate production device as claimed in claim 1 is adopted to produce the LCP copper-clad plate, and the method comprises the following steps:
s10: conveying the LCP resin slices into a screw extruder, and heating to melt the LCP resin slices;
s20: controlling a copper foil unreeling mechanism to drive copper foil to a hot pressing roller;
s30: controlling the screw extruder to extrude the molten LCP resin to the middle of the copper foil symmetrically distributed in the middle of the hot pressing roller set;
s40: controlling the hot-pressing roller group to press the LCP resin and the copper foil to form a copper-clad plate;
s50: controlling an after-finishing roller set and a cooling roller set to carry out after-finishing and cooling on the copper-clad plate;
s60: controlling the protective film rolling mechanism to peel and roll the protective film from the surface of the copper-clad plate;
s70: and controlling a finished product winding mechanism to wind the cooled copper-clad plate.
14. The method for producing a copper-clad plate according to claim 13, wherein the temperature of the hot press rolls in the hot press roll group is less than the critical phase separation temperature T of the LCP resincAnd is higher than the melting point temperature T of the LCP resinm。
15. The method for producing a copper-clad plate according to claim 13, wherein the screw extruder comprises a hopper and a cylinder which are communicated, and the LCP resin chips are added from the hopper and heated in the cylinder; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three temperature zones are sequentially arranged between the charging opening and the nozzle along the transmission direction of the LCP resin; the temperatures of the three temperature zones are strictly controlled and gradually increased; the temperature of the nozzle is lower than that of the third temperature zone of the three temperature zones.
16. The method for producing a copper-clad plate according to claim 13, wherein the screw extruder is provided with a nozzle capable of precisely controlling the flow rate, the nozzle and the hot press roller group are arranged in a protective cover which is sealed relatively, and the protective cover is filled with nitrogen; the nitrogen in the protective cover keeps micro-positive pressure, so that air can be effectively discharged, and the quality of the peripheral air cannot be influenced; the screw extruder passes through penetrate the mouth and extrude LCP resin, it has a predetermined distance with the part that two hot press rolls contacted to penetrate the mouth, and is located two hot press roll contact site directly over.
17. The method for producing a copper-clad plate according to claim 13, wherein the number of the copper foil unwinding mechanisms is two, and the LCP resin on the surface of the copper foil is extruded from an injection nozzle and then cast between two layers of copper foils for hot press compounding.
The step S10 further includes: the temperature of the nozzle is controlled to be higher than TcThe LCP resin extruded from the nozzle is in an isotropic liquid state.
The step S20 further includes: controlling the protective film unwinding mechanism to drive the protective film to unwind and roll; the copper foil is positioned between two layers of protective films and is pressed with the LCP resin and the protective films to form the copper-clad plate with the protective films on the surface; the protective film winding mechanism is used for stripping and winding the protective film from the surface of the copper-clad plate;
the step S30 further includes: a temperature detection and control device is arranged in the protective cover, and the temperature in the protective cover is controlled to be the melting point temperature T of the LCP resinmAbove, but below the critical phase separation temperature Tc. The protective film and the protective cover are filled with nitrogen gas to protect the copper foil from being oxidized due to contact with air at high temperature.
The step S40 further includes: the LCP resin is extruded and then is stacked on the copper foil between the two hot-pressing rollers; the hot pressing roller is driven by a motor to rotate, and the molten LCP resin and the copper foil are pressed; the temperature of the hot pressing roller is controlled to be TmAbove, but less than Tc. And the LCP resin and the copper foil are subjected to hot-pressing to obtain the LCP copper-clad plate.
The step S50 further includes: the after-finishing roller group comprises at least four groups of press rollers. At least two groups of press rolls are heating rolls, and the roll surface temperature is controlled at TmAnd TcIn the meantime. The LCP resin is subjected to the pressThe roller is in a molten state, and plays a role in transverse stretching under the hot pressing of the pressing roller. And at least two groups of compression rollers are cooling rollers, the temperature of the cooling roller group is set to be gradually reduced, and the copper-clad plate is gradually cooled to the required temperature.
The step S60 further includes:
a thickness measuring mechanism is arranged between the cooling roller set and the finished product winding mechanism, and signals of the thickness measuring mechanism are transmitted to a central control system of the whole set of production device; the thickness measuring mechanism is used for measuring the thickness of the copper clad plate; the screw extruder adjusts the amount of LCP resin extruded by the nozzle in unit time according to the measurement result of the thickness measurement mechanism, and the hot-pressing roller group adjusts the rolling speed and pressure of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
The step S60 further includes:
the device also comprises two trimming scrapers, wherein the two trimming scrapers are positioned between the cooling roller set and the finished product winding mechanism and are symmetrically distributed on two sides of the copper-clad plate; the trimming scraper is used for trimming the copper-clad plate before rolling and cutting off the part of the edge of the copper-clad plate with apparent defect.
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