CN111231254A - Copper-clad plate production device and production method - Google Patents
Copper-clad plate production device and production method Download PDFInfo
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- CN111231254A CN111231254A CN202010039997.7A CN202010039997A CN111231254A CN 111231254 A CN111231254 A CN 111231254A CN 202010039997 A CN202010039997 A CN 202010039997A CN 111231254 A CN111231254 A CN 111231254A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/025—General arrangement or layout of plant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3425—Printed circuits
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a copper-clad plate production device and a production method, wherein the device comprises: a screw extruder; the metal foil unreeling mechanism is used for driving the metal foil to unreel and roll; at least one hot-pressing roller group, wherein each hot-pressing roller group comprises two hot-pressing rollers which are oppositely arranged; the screw extruder melts the liquid crystal polymer material, extrudes the melted liquid crystal polymer material to the surface of a layer of metal foil attached to the surface of the hot pressing roller, and transmits the melted liquid crystal polymer material to a position between the opposite hot pressing rollers in the hot pressing roller group along the surface of the metal foil; the hot-pressing roller group presses the liquid crystal polymer material and the metal foil to form a copper-clad plate; at least two groups of cooling roller sets are used for cooling the copper-clad plate; each cooling roller set comprises two cooling rollers, and the cooling rollers in each cooling roller set are distributed on two sides of the copper-clad plate; and a finished product rolling mechanism for driving the cooled copper-clad plate to roll; the invention overcomes the limitation that the copper-clad plate can be produced only by film-forming the liquid crystal polymer material, and improves the production speed of the copper-clad plate.
Description
Technical Field
The invention relates to the technical field of production of copper-clad plates for manufacturing 5G antennas, in particular to a production device and a production method of a copper-clad plate.
Background
With the advent of the 5G era, various 5G communication devices have higher frequencies and higher transmission speeds, and thus have made higher demands on dielectric constants, dielectric dissipation factors, and the like of electronic materials used for the devices. The traditional epoxy-based copper clad laminate and polyimide-based copper clad laminate cannot meet the electrical performance requirements necessary for high-frequency communication, and the Liquid Crystal Polymer (LCP) high Polymer material becomes the most important basic material for producing the copper clad laminate in the 5G era due to low moisture absorption, good chemical resistance, high gas barrier property and extremely low dielectric constant and dielectric loss factor.
In the prior art, the method for manufacturing the copper-clad plate by adopting the LCP material is to form a film by the LCP material and then press the formed LCP material and the copper foil to form the copper-clad plate. The Flexible Printed Circuit (FPC) Flexible board 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 the antenna module by an antenna module manufacturer according to different antenna designs.
However, the LCP material has the unique physical and chemical properties of both crystal and polymer materials, so that the LCP material has very strict requirements on film forming equipment and process, and the LCP material has very high film forming difficulty. At present, few manufacturers capable of providing a commercialized technical scheme for LCP film forming exist, so that the production capacity of the film-coated plate adopting LCP materials is severely restricted, and the film-coated plate becomes a fatal technical short plate for developing 5G industry groups in China. On the other hand, the LCP material and the copper foil which are formed into the film are directly subjected to hot-pressing compounding, the production speed is extremely low, the production speed of only 2-3 m/min can be realized probably, and the production efficiency is extremely low.
Disclosure of Invention
In view of the above, the invention provides a production device and a production method of a copper-clad plate, which overcome the limitation that a liquid crystal polymer material needs to be formed into a film in the process of producing the copper-clad plate in the prior art, and improve the production speed of the copper-clad plate.
According to one aspect of the invention, the invention provides a copper-clad plate production device, which comprises the following components in the transmission direction of metal foil:
a screw extruder;
the metal foil unreeling mechanism is used for driving the metal foil to unreel and roll;
the hot pressing roller set comprises two hot pressing rollers which are oppositely arranged; the screw extruder melts and extrudes the liquid crystal polymer material to the surface of a layer of metal foil attached to the surface of the hot pressing roller, and the liquid crystal polymer material is transmitted to the position between the opposite hot pressing rollers in the hot pressing roller group along the surface of the metal foil; the hot-pressing roller group presses the liquid crystal polymer material and the metal foil to form a copper-clad plate;
at least two groups of cooling roller sets are used for cooling the copper-clad plate; each cooling roller set comprises two cooling rollers, and the cooling rollers in each cooling roller set are distributed on two sides of the copper-clad plate;
and a finished product rolling mechanism for driving the cooled copper-clad plate to roll.
Preferably, the temperature of the hot press rolls in the hot press roll group is less than the melting point temperature of the liquid crystal polymer material and greater than the heat distortion temperature of the liquid crystal polymer material.
Preferably, the screw extruder comprises a hopper and a barrel which are communicated, the liquid crystal polymer material is added from the hopper and enters the barrel to be heated; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three subareas are sequentially arranged between the charging opening and the nozzle along the transmission direction of the liquid crystal polymer material; and the temperature of the three subareas is gradually increased, and the temperature of the nozzle is lower than that of the third subarea in the three subareas.
Preferably, the screw extruder is provided with a nozzle, and the nozzle and the hot-pressing roller group are both positioned in a nitrogen charging container; the screw extruder extrudes the liquid crystal polymer material through the injection nozzle, a preset distance exists between the injection nozzle and the contact part of the two hot pressing rollers, and the hot pressing rollers belong to the hot pressing roller group close to the injection nozzle.
Preferably, a thickness measuring mechanism is arranged between the hot pressing roller set and the cooling roller set and/or between the cooling roller set and the finished product winding mechanism, the thickness measuring mechanism is respectively and electrically connected with the screw extruder and the hot pressing roller set, and the thickness measuring mechanism is used for measuring the thickness of the copper-clad plate; the screw extruder adjusts the capacity of extruding liquid crystal polymer materials in unit time of the nozzle according to the measurement result of the thickness measurement mechanism, and the hot press roller group adjusts the rolling speed of the hot press roller according to the measurement result of the thickness measurement mechanism.
Preferably, the metal foil unwinding mechanism has two metal foil unwinding mechanisms, and the liquid crystal polymer material on the surface of the metal foil is conveyed between two metal foils for pressing.
Preferably, the device further comprises at least one protective film unreeling mechanism and at least one protective film reeling mechanism, wherein the protective film unreeling mechanism is used for driving the protective film to unreel and roll, and the protective film reeling mechanism is used for peeling and reeling the protective film from the surface of the copper-clad plate; the number of the protective film winding mechanisms is the same as that of the protective film unwinding mechanisms.
Preferably, along the transmission direction of the copper-clad plate, the temperature of the cooling rollers in the same cooling roller group is the same, and the temperature of the cooling rollers in different cooling roller groups is gradually reduced.
Preferably, the device further comprises two protective film unwinding mechanisms, wherein the protective film unwinding mechanisms are used for driving the protective films to unwind and roll; the metal foil is positioned between two layers of protective films and is pressed with the liquid crystal polymer material and the protective films to form the copper-clad plate with the protective films on the surface.
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 distributed on two sides of the copper-clad plate; the trimming scraper is used for trimming the copper-clad plate before rolling so as to align the edges of the metal foil and the liquid crystal polymer material.
Preferably, the hot-pressing roller is an electromagnetic heating roller, and the metal foil is a copper foil.
According to another aspect of the invention, a production method of a copper-clad plate is provided, the copper-clad plate is produced by adopting the production device of the copper-clad plate, and the method comprises the following steps:
s10, conveying the liquid crystal polymer material to a screw extruder, and controlling a metal foil unwinding mechanism to drive metal foil to unwind and roll;
s20, controlling the screw extruder to melt the liquid crystal polymer material, extruding the melted liquid crystal polymer material to the surface of a layer of metal foil attached to the surface of a hot pressing roller, and transmitting the melted liquid crystal polymer material to a position between the opposite hot pressing rollers in the hot pressing roller group along the surface of the metal foil;
s30, controlling the hot-pressing roller group to press the liquid crystal polymer material and the metal foil to form a copper-clad plate;
s40, controlling a cooling roller set to cool the copper-clad plate;
and S60, controlling a finished product winding mechanism to wind the cooled copper-clad plate.
Preferably, the temperature of the hot press rolls in the hot press roll group is less than the melting point temperature of the liquid crystal polymer material and greater than the heat distortion temperature of the liquid crystal polymer material.
Preferably, the screw extruder comprises a hopper and a barrel which are communicated, the liquid crystal polymer material is added from the hopper and enters the barrel to be heated; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three subareas are sequentially arranged between the charging opening and the nozzle along the transmission direction of the liquid crystal polymer material; and the temperature of the three subareas is gradually increased, and the temperature of the nozzle is lower than that of the third subarea in the three subareas.
Preferably, the screw extruder is provided with a nozzle, and the nozzle and the hot-pressing roller group are both positioned in a nitrogen charging container; the screw extruder extrudes the liquid crystal polymer material through the injection nozzle, a preset distance exists between the injection nozzle and the contact part of the two hot pressing rollers, and the hot pressing rollers belong to the hot pressing roller group close to the injection nozzle.
Preferably, the number of the metal foil unwinding mechanisms is two, and the copper-clad plate production device further comprises two protection film unwinding mechanisms and two protection film winding mechanisms;
the step S10 further includes: controlling the protective film unwinding mechanism to drive the protective film to unwind and roll;
the step S30 includes:
controlling the hot-pressing roller group to press the liquid crystal polymer material, the metal foil and the protective film to form the copper-clad plate with the protective film on the surface; the liquid crystal polymer material is positioned between two layers of the metal foils, and the metal foils are positioned between two layers of the protective films;
between the step S40 and the step S60, there is further included a step S50: and controlling the protective film rolling mechanism to peel and roll the protective film from the surface of the copper-clad plate.
Preferably, a thickness measuring mechanism is arranged between the hot pressing roller set and the cooling roller set and/or between the cooling roller set and the finished product winding mechanism, the thickness measuring mechanism is respectively and electrically connected with the screw extruder and the hot pressing roller set, and the thickness measuring mechanism is used for measuring the thickness of the copper-clad plate;
the step S40 and the step S60 include the steps of:
controlling the screw extruder to adjust the capacity of extruding the liquid crystal polymer material in unit time of the nozzle according to the measurement result of the thickness measurement mechanism; and controlling the hot-pressing roller group to adjust the rolling speed of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
Compared with the prior art, the invention has the beneficial effects that:
the production device and the production method of the copper-clad plate provided by the invention heat and melt the liquid crystal polymer material, directly cast the liquid crystal polymer material on the surface of the metal foil, and then press-fit the liquid crystal polymer material and the metal foil in the middle state at high temperature through the hot-pressing roller group to form the copper-clad plate; the method overcomes the limitation that the liquid crystal polymer material is required to be firstly formed into a film to be pressed to manufacture the copper-clad plate in the prior art, obviously improves the production speed of the copper-clad plate, and improves the production speed of the copper-clad plate from 2-3 m/min to 25-100 m/min.
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 a copper-clad plate production device disclosed in the embodiment of the invention;
FIG. 2 is a schematic structural diagram of a screw extruder in a copper-clad plate production device;
FIG. 3 is a schematic structural diagram of a copper-clad plate produced by the copper-clad plate production device disclosed by the embodiment of the invention;
FIG. 4 is a schematic flow chart of a production method of a copper-clad plate disclosed by the embodiment of the invention;
fig. 5 is a schematic flow chart of a copper-clad plate production method disclosed in another 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 a liquid crystal polymer material 301, and then pressing the melted liquid crystal polymer material and a metal foil at a high temperature to manufacture the copper-clad plate. Along the transmission direction of the metal foil, the apparatus includes a screw extruder 101, at least one metal foil unwinding mechanism 102, at least one protective film unwinding mechanism 103, at least one hot press roller set 104, at least two cooling roller sets 105, at least one protective film winding mechanism 106, and a finished product winding mechanism 107.
In this embodiment, the metal foil is a copper foil 302, and the protection film unreeled by the protection film unreeling mechanism 103 is a PI (Polyimide) film. The number of the metal foil unwinding mechanism 102, the protection film unwinding mechanism 103, and the protection film winding mechanism 106 is two, and the number of the hot press roller group 104 is one, but the present application does not limit the number of all the mechanisms and the hot press roller group 104, and the type of the metal foil.
The metal 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 106 is used for peeling and winding the protective film from the surface of the copper-clad plate; the number of the protective film winding mechanisms 106 is the same as that of the protective film unwinding mechanisms 103. The protective films 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 abraded.
Each of the hot press roller sets 104 includes two hot press rollers 110 disposed opposite to each other, and the hot press rollers 110 in each hot press roller set 104 are disposed on both sides of the copper foil 302 in advance. The screw extruder 101 melts and extrudes the liquid crystal polymer material 301 to the surface of the copper foil 302 attached to the surface of the hot press roll 110, and transmits the molten liquid crystal polymer material to the space between the hot press rolls 110 opposite to each other in the hot press roll group 104 along the surface of the copper foil 302. That is, in the present embodiment, a predetermined distance exists between the screw extruder and the portion where the two hot press rolls adjacent thereto are in contact. Specifically, the liquid crystal polymer material 301 is extruded, and then contacted with the copper foil 302 on the surface of one hot press roll 110, and after traveling the predetermined distance, contacted with the copper foil 302 on the surface of another hot press roll 110 in the same hot press roll set 104. The liquid crystal polymer material 301 needs to be driven within the preset distance before contacting with another layer of copper foil 302, for example, 10cm, the preset distance can ensure that the liquid crystal polymer material 301 is pressed with the copper foil 302 after being uniformly extended, and the yield of the manufactured copper-clad plate is ensured; meanwhile, the temperature of the liquid crystal polymer material 301 is reduced, so that the liquid crystal polymer material 301 is converted from a molten liquid state to an intermediate state, and the copper-clad plate is manufactured and molded. The intermediate state is a state of the liquid crystal polymer material 301 between liquid and solid states.
In order to keep the liquid crystal polymer material 301 on the surface of the hot press roll 110 after extrusion in the intermediate state and to prevent it from being transformed into a liquid or solid state, the temperature of the hot press roll 110 in the hot press roll set 104 is lower than the melting point temperature of the liquid crystal polymer material 301 and higher than the heat distortion temperature of the liquid crystal polymer material 301. Illustratively, the melting point temperature of the liquid crystal polymer material 301 is 315 ℃, the heat distortion temperature is 312 ℃, and the temperature of the hot press roll 110 is 313 ℃.
The hot-pressing roller set 104 presses the liquid crystal polymer material 301 and the copper foil 302 to form a copper-clad plate. In this embodiment, because the protective film is further provided, in this embodiment, the hot-press roller set 104 presses together a layer of liquid crystal polymer material 301, two layers of the copper foil 302 and two layers of the protective film to form a copper-clad plate with the protective film on the surface. Since the metal foil unwinding mechanism 102 and the protective film unwinding mechanism 103 in this embodiment are provided with two layers, the copper foil 302 and the protective film driven in the production apparatus are provided with two layers, respectively. The liquid crystal polymer material 301 on the surface of the copper foil 302 is transferred between the two copper foils 302 by the hot-pressing roller 110, namely, the liquid crystal polymer material is respectively contacted with the two copper foils 302, and simultaneously, the liquid crystal polymer material is pressed together with the copper foils 302 and the protective film by the hot-pressing roller group 104, so that the copper-clad plate with the protective film on the surface is formed.
As shown in fig. 2, in this embodiment, the screw extruder 101 includes a hopper 201 and a cylinder which are communicated with each other, and the liquid crystal polymer material 301 is fed from the hopper 201 and heated in the cylinder. The feed opening 202 and the nozzle 203 are respectively arranged at two ends of the barrel, and three partitions, namely a first partition 204, a second partition 205 and a third partition 206 are sequentially arranged between the feed opening 202 and the nozzle 203 along the transmission direction of the liquid crystal polymer material 301. The temperatures of the three zones gradually increase, and the temperatures of the three zones are all higher than the melting point temperature of the liquid crystal polymer material 301. The temperature of the nozzle 203 is equal to the temperature of the second of the three zones and less than the temperature of the third of the three zones. That is, the nozzle 203 has a temperature equal to that of the second section 205 and less than that of the third section 206, so that it is ensured that the liquid crystal polymer material 301 is extruded in an optimal state, and uniform spreading and cooling forming on the surface of the hot press roller 110 are facilitated. Illustratively, the feed inlet 202 has a temperature of 60 ℃, the first zone 204 has a temperature of 295 ℃, the second zone 205 and the nozzle 203 each have a temperature of 310 ℃, and the third zone 206 has a temperature of 320 ℃.
In this embodiment, the screw extruder 101 extrudes the liquid crystal polymer material 301 through the nozzle 203. The portion of the nozzle 203 in contact with the two hot press rollers 110 has the predetermined distance, and the hot press rollers 110 belong to the hot press roller group 104 close to the nozzle.
In this embodiment, the nozzle 203 and the hot press roll set 104 are both located in a nitrogen-filled container, so that the heated copper foil 302 can be prevented from being oxidized. The nozzle 203 needs to have a precise temperature control function, and the temperature control error of the nozzle 203 is within ± 1.5 ℃.
In the copper-clad plate production device disclosed by the embodiment, the copper-clad plate pressed by the hot-pressing roller group 104 enters the cooling roller group 105, and the cooling roller group 105 cools the copper-clad plate. Each cooling roller set 105 comprises two cooling rollers 111, and the cooling rollers 111 in each cooling roller set 105 are distributed on two sides of the copper-clad plate. Because the copper-clad plate production speed of the apparatus for producing of this embodiment is very fast, so in order to guarantee that the copper-clad plate after the pressfitting of hot-pressing roller set 104 can the rapid cooling, cooling roller set 105 in this application need have two sets ofly at least. And satisfies the condition: along the transmission direction of the copper-clad plate, the temperature of the cooling rollers 111 in the same cooling roller set 105 is the same, and the temperature of the cooling rollers 111 in different cooling roller sets 105 is gradually reduced.
For example, along the transmission direction of the copper-clad plate, the temperature of the cooling roller 111 in the first cooling roller set 105 is 80 ℃, the temperature of the cooling roller 111 in the last cooling roller set 105 is 20 ℃, and the difference between the temperatures of the cooling rollers 111 in two adjacent cooling roller sets 105 can be 10-20 ℃.
After the copper-clad plate is cooled, the protective film is peeled off from the surface of the copper-clad plate by the protective film rolling mechanism 106 and is rolled, and the copper-clad plate after the protective film is peeled off is rolled by the finished product rolling mechanism 107, so that the preparation of the copper-clad plate is completed. The structure of the finally prepared copper-clad plate is shown in fig. 3, and the copper-clad plate comprises two layers of copper foils 302 and a liquid crystal polymer material 301 positioned between the two layers of copper foils 302.
In another embodiment of the present invention, a thickness measuring mechanism (not shown) is provided between the hot press roller group 104 and the cooling roller group 105 and/or between the cooling roller group 105 and the finished product winding mechanism 107. The thickness measuring mechanism is electrically connected to the screw extruder 101 and the hot press roll group 104, respectively. The thickness measuring mechanism is used for measuring the thickness of the copper clad plate. The screw extruder 101 adjusts the capacity of the nozzle 203 to extrude the liquid crystal polymer material per unit time based on the measurement result of the thickness measuring means, and the hot press roller group adjusts the rolling speed of the hot press roller 110 based on the measurement result of the thickness measuring means. Generally, the thickness of the copper clad laminate to be produced, that is, the design thickness of the copper clad laminate, is determined, and then the thickness of the liquid crystal polymer material 301 to be extruded can be determined according to the known thickness of the copper foil 302.
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 capacity of the nozzle 203 for extruding the liquid crystal polymer material in unit time, and the production device controls the hot-press roller group to reduce the rolling speed of the hot-press roller 110. 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 capacity of the nozzle 203 for extruding the liquid crystal polymer material in unit time, and the production device is controlled to increase the rolling speed of the hot-pressing roller 110 by the hot-pressing roller group.
In this embodiment, the apparatus for producing a copper-clad plate further comprises two trimming scrapers 108, wherein the two trimming scrapers 108 are located between the cooling roller set 105 and the finished product winding mechanism 107 and distributed on two sides of the copper-clad plate; the trimming scraper 108 is used for trimming the copper-clad plate before rolling so as to align the edges of the copper foil and the liquid crystal polymer material.
In this embodiment, the apparatus for producing copper-clad plate includes a plurality of guide rollers 109 respectively located between the metal foil unwinding mechanism 102 and the hot press roller, between the protective film unwinding mechanism 103 and the hot press roller 110, between the hot press roller set 104 and the cooling roller set 105, and between the cooling roller set 105 and the protective film winding mechanism 106. The guide roller 109 is used for changing the transmission direction of the copper foil 302, the protective film or the copper-clad plate.
In another embodiment of the present invention, the number of the metal foil unwinding mechanisms 102 is two, the copper-clad plate production apparatus is not provided with the protective film unwinding mechanism 103 and the protective film winding mechanism 106, and the hot-press roller set 104 is used for laminating the liquid crystal polymer material 301 and the two layers of copper foils 302.
In this embodiment, the hot press roller 110 is an electromagnetic heating roller or a high-precision electric heating roller, so that the temperature of the hot press roller 110 can be accurately controlled, and the surface temperature of the hot press roller 110 can be ensured to be uniform, so that the copper foil 302 can be uniformly heated. However, the present application does not limit the type of the heat and pressure roller 110.
As shown in fig. 4, the embodiment of the invention also discloses a production method of the copper-clad plate, the method adopts the production device of the copper-clad plate disclosed in any embodiment to produce the copper-clad plate, and the production method comprises the following steps:
s10, conveying the liquid crystal polymer material to a screw extruder, and controlling a metal foil unwinding mechanism to drive a copper foil to unwind and roll;
s20, controlling the screw extruder to melt the liquid crystal polymer material, extruding the melted liquid crystal polymer material to the surface of a layer of copper foil attached to the surface of a hot pressing roller, and transmitting the melted liquid crystal polymer material to a position between the opposite hot pressing rollers in the hot pressing roller group along the surface of the copper foil;
s30, controlling the hot-pressing roller set to press the liquid crystal polymer material and the copper foil to form a copper-clad plate;
s40, controlling a cooling roller set to cool the copper-clad plate;
and S60, controlling the finished product winding mechanism to wind the cooled copper-clad plate.
Wherein the temperature of the hot-pressing roller in the hot-pressing roller group is less than the melting point temperature of the liquid crystal polymer material and greater than the heat distortion temperature of the liquid crystal polymer material.
The screw extruder comprises a hopper and a cylinder which are communicated, and the liquid crystal polymer material is added from the hopper and enters the cylinder for heating. The two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three subareas, namely a first subarea, a second subarea and a third subarea, are sequentially arranged between the charging opening and the nozzle along the transmission direction of the liquid crystal polymer material. And the temperature of the three subareas is gradually increased, and the temperature of the nozzle is equal to the temperature of the second subarea of the three subareas and is less than the temperature of the third subarea of the three subareas. That is, the temperature of the nozzle is equal to the temperature of the second zone and less than the temperature of the third zone, so that the liquid crystal polymer material can be extruded in an optimal state, and the uniform extension and cooling forming on the surface of the hot-pressing roller are facilitated.
In a preferred embodiment, the nozzle and the hot press roller set are both located in a nitrogen-filled container; the screw extruder extrudes the liquid crystalline polymer material through the nozzle. The contact part of the nozzle and the two hot pressing rollers has a preset distance, and the hot pressing rollers belong to a hot pressing roller group close to the nozzle. The arrangement of the preset distance can ensure that the liquid crystal polymer material is pressed with the copper foil after being uniformly extended, thereby ensuring the yield of the manufactured copper-clad plate; meanwhile, the temperature of the liquid crystal polymer material is reduced, the liquid crystal polymer material is converted into an intermediate state from a molten liquid state, and the copper-clad plate is manufactured and molded. The intermediate state is a state of the liquid crystalline polymer material between liquid and solid states.
As a preferred embodiment, a thickness measuring mechanism is provided between the hot press roller set and the cooling roller set and/or between the cooling roller set and the finished product take-up mechanism. The thickness measuring mechanism is electrically connected with the screw extruder and the hot-pressing roller set respectively. The thickness measuring mechanism is used for measuring the thickness of the copper clad plate.
The step S40 and the step S60 include the steps of:
controlling the screw extruder to adjust the capacity of extruding the liquid crystal polymer material in unit time of the nozzle according to the measurement result of the thickness measurement mechanism; and controlling the hot-pressing roller group to adjust the rolling speed of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
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 is controlled to reduce the capacity of extruding the liquid crystal polymer material in unit time of the nozzle, and the production device controls the hot-pressing roller group to reduce the rolling speed of the hot-pressing roller. 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 is controlled to increase the capacity of extruding the liquid crystal polymer material in unit time of the nozzle, and the hot-pressing roller group is controlled to increase the rolling speed of the hot-pressing roller.
Fig. 5 is a schematic flow diagram of a copper-clad plate production method disclosed in another embodiment of the present invention, in which the number of metal foil unwinding mechanisms is two, and the adopted copper-clad plate production apparatus further includes two protective film unwinding mechanisms and two protective film winding mechanisms. As shown in fig. 5, in the copper-clad plate production method disclosed in this embodiment, on the basis of the production method disclosed in the above embodiment, step S10 further includes: and controlling the protective film unwinding mechanism to drive the protective film to unwind and roll.
Step S30 in this embodiment specifically includes: and controlling the hot-pressing roller group to press the liquid crystal polymer material, the copper foil and the protective film to form the copper-clad plate with the protective film on the surface. The liquid crystal polymer material is positioned between the two layers of metal foils, and the metal foils are positioned between the two layers of protective films.
Further, between step S40 and step S60, step S50 is further included: and controlling the protective film winding mechanism to peel and wind the protective film from the surface of the copper-clad plate.
And step S60, controlling a finished product winding mechanism to wind the copper-clad plate after the protective film is peeled off.
In summary, the copper-clad plate production device and the production method disclosed by the invention have at least the following advantages:
the production device and the production method of the copper-clad plate disclosed by the embodiment heat and melt the liquid crystal polymer material, directly cast the liquid crystal polymer material on the surface of the metal foil, and then press-fit the liquid crystal polymer material and the metal foil in the middle state at high temperature through the hot-press roller group to form the copper-clad plate; the method overcomes the limitation that the liquid crystal polymer material is required to be firstly formed into a film to be pressed to manufacture the copper-clad plate in the prior art, obviously improves the production speed of the copper-clad plate, and improves the production speed of the copper-clad plate from 2-3 m/min to 25-100 m/min.
Compared with the method that LCP film forming is firstly carried out and then pressing is carried out in the prior art, the method shortens the process flow; the comprehensive energy consumption in the production process is reduced by at least 30 percent; in addition, LCP film forming is not needed, so that the development threshold of copper-clad plate production enterprises is reduced, and the development of the whole industry is facilitated.
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 copper-clad plate production device is characterized by comprising the following components in the transmission direction of metal foil:
a screw extruder;
the metal foil unreeling mechanism is used for driving the metal foil to unreel and roll;
the hot pressing roller set comprises two hot pressing rollers which are oppositely arranged; the screw extruder melts and extrudes the liquid crystal polymer material to the surface of a layer of metal foil attached to the surface of the hot pressing roller, and the liquid crystal polymer material is transmitted to the position between the opposite hot pressing rollers in the hot pressing roller group along the surface of the metal foil; the hot-pressing roller group presses the liquid crystal polymer material and the metal foil to form a copper-clad plate;
at least two groups of cooling roller sets are used for cooling the copper-clad plate; each cooling roller set comprises two cooling rollers, and the cooling rollers in each cooling roller set are distributed on two sides of the copper-clad plate;
and a finished product rolling mechanism for driving the cooled copper-clad plate to roll.
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 melting point temperature of the liquid crystal polymer material and greater than the heat distortion temperature of the liquid crystal polymer material.
3. The copper-clad plate production device according to claim 1, wherein the screw extruder comprises a hopper and a cylinder which are communicated, the liquid crystal polymer material is added from the hopper and enters the cylinder for heating; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three subareas are sequentially arranged between the charging opening and the nozzle along the transmission direction of the liquid crystal polymer material; and the temperature of the three subareas is gradually increased, and the temperature of the nozzle is lower than that of the third subarea in the three subareas.
4. The apparatus for producing copper-clad plate according to claim 1, wherein the screw extruder has a nozzle, and the nozzle and the hot-press roller set are both located in a nitrogen-filled container; the screw extruder extrudes the liquid crystal polymer material through the injection nozzle, a preset distance exists between the injection nozzle and the contact part of the two hot pressing rollers, and the hot pressing rollers belong to the hot pressing roller group close to the injection nozzle.
5. The copper-clad plate production device of claim 1, wherein a thickness measuring mechanism is arranged between the hot-pressing roller group and the cooling roller group and/or between the cooling roller group and the finished product winding mechanism, the thickness measuring mechanism is respectively electrically connected with the screw extruder and the hot-pressing roller group, and the thickness measuring mechanism is used for measuring the thickness of the copper-clad plate; the screw extruder adjusts the capacity of extruding liquid crystal polymer materials in unit time of the nozzle according to the measurement result of the thickness measurement mechanism, and the hot press roller group adjusts the rolling speed of the hot press roller according to the measurement result of the thickness measurement mechanism.
6. The apparatus for producing copper-clad plate according to claim 1, wherein the metal foil unwinding mechanism comprises two metal foil unwinding mechanisms, and the liquid crystal polymer material on the surface of the metal foil is conveyed between two metal foil layers for lamination.
7. The copper-clad plate production device according to claim 1, further comprising at least one protective film unwinding mechanism for driving the protective film to unwind and roll, and at least one protective film winding mechanism for peeling and winding the protective film from the surface of the copper-clad plate; the number of the protective film winding mechanisms is the same as that of the protective film unwinding mechanisms.
8. The copper-clad plate production device of claim 1, wherein along the transmission direction of the copper-clad plate, the temperature of the cooling rollers in the same cooling roller group is the same, and the temperature of the cooling rollers in different cooling roller groups is gradually reduced.
9. The copper-clad plate production device according to claim 6, further comprising two protective film unwinding mechanisms, wherein the protective film unwinding mechanisms are used for driving the protective films to unwind and roll; the metal foil is positioned between two layers of protective films and is pressed with the liquid crystal polymer material and the protective films to form the copper-clad plate with the protective films on the surface.
10. The copper-clad plate production device according to claim 1, further comprising two trimming scrapers, wherein the two trimming scrapers are located 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 so as to align the edges of the metal foil and the liquid crystal polymer material.
11. The copper-clad plate production device of claim 1, wherein the hot-pressing roller is an electromagnetic heating roller, and the metal foil is a copper foil.
12. A production method of a copper-clad plate is characterized in that the copper-clad plate is produced by adopting the production device of the copper-clad plate as in claim 1, and the method comprises the following steps:
s10, conveying the liquid crystal polymer material to a screw extruder, and controlling a metal foil unwinding mechanism to drive metal foil to unwind and roll;
s20, controlling the screw extruder to melt the liquid crystal polymer material, extruding the melted liquid crystal polymer material to the surface of a layer of metal foil attached to the surface of a hot pressing roller, and transmitting the melted liquid crystal polymer material to a position between the opposite hot pressing rollers in the hot pressing roller group along the surface of the metal foil;
s30, controlling the hot-pressing roller group to press the liquid crystal polymer material and the metal foil to form a copper-clad plate;
s40, controlling a cooling roller set to cool the copper-clad plate;
and S60, controlling a finished product winding mechanism to wind the cooled copper-clad plate.
13. The method for producing a copper-clad plate according to claim 12, wherein the temperature of the hot press rolls in the hot press roll group is lower than the melting point temperature of the liquid crystal polymer material and higher than the heat distortion temperature of the liquid crystal polymer material.
14. The method for producing a copper-clad plate according to claim 12, wherein the screw extruder comprises a hopper and a cylinder which are communicated, the liquid crystal polymer material is added from the hopper and enters the cylinder for heating; the two ends of the charging barrel are respectively provided with a charging opening and a nozzle, and three subareas are sequentially arranged between the charging opening and the nozzle along the transmission direction of the liquid crystal polymer material; and the temperature of the three subareas is gradually increased, and the temperature of the nozzle is lower than that of the third subarea in the three subareas.
15. The process for producing a copper-clad plate according to claim 12, wherein the screw extruder has a nozzle, and the nozzle and the set of hot press rolls are both located in a nitrogen-filled container; the screw extruder extrudes the liquid crystal polymer material through the injection nozzle, a preset distance exists between the injection nozzle and the contact part of the two hot pressing rollers, and the hot pressing rollers belong to the hot pressing roller group close to the injection nozzle.
16. The method for producing a copper-clad plate according to claim 12, wherein the number of the metal foil unwinding mechanisms is two, and the copper-clad plate production apparatus further comprises two protective film unwinding mechanisms and two protective film winding mechanisms;
the step S10 further includes: controlling the protective film unwinding mechanism to drive the protective film to unwind and roll;
the step S30 includes:
controlling the hot-pressing roller group to press the liquid crystal polymer material, the metal foil and the protective film to form the copper-clad plate with the protective film on the surface; the liquid crystal polymer material is positioned between two layers of the metal foils, and the metal foils are positioned between two layers of the protective films;
between the step S40 and the step S60, there is further included a step S50: and controlling the protective film rolling mechanism to peel and roll the protective film from the surface of the copper-clad plate.
17. The method for producing the copper-clad plate according to claim 12, wherein a thickness measuring mechanism is arranged between the hot-pressing roller set and the cooling roller set and/or between the cooling roller set and the finished product winding mechanism, the thickness measuring mechanism is respectively electrically connected with the screw extruder and the hot-pressing roller set, and the thickness measuring mechanism is used for measuring the thickness of the copper-clad plate;
the step S40 and the step S60 include the steps of:
controlling the screw extruder to adjust the capacity of extruding the liquid crystal polymer material in unit time of the nozzle according to the measurement result of the thickness measurement mechanism; and controlling the hot-pressing roller group to adjust the rolling speed of the hot-pressing roller according to the measurement result of the thickness measurement mechanism.
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| CN111231254B (en) | 2022-08-02 |
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