JPH02248224A - Manufacture and its device for laminated sheet with depressurizing semi-continuous press - Google Patents

Abstract

PURPOSE:To enable manufacturing of a laminated sheet superior in dimensional accuracy and the other physical properties also, by a method wherein transfer of a laminated material set and laminated sheet under depressurization is performed through a movement of an endless metallic foil belt. CONSTITUTION:A prevacuum chamber A, press machine B and taking-out chamber C are connected in series with each other in this order and the prevacuum chamber a and taking-out chamber C are provided respectively with a vacuum shutter V of a taking-in port of a laminated material set and the vacuum shutter V for taking-out of a laminated sheet. The title device is constituted so that end parts of the opposite sides of the prevacuum chamber A and taking-out chamber C in relation to the press machine are provided respectively with endless metallic foil belt holding and transferring parts M1, M2 and transfer of the laminated material set and laminated sheet under depressurization can be performed. The prevacuum chamber A is provided with a transfer device introducing the laminated material set from a laminated material set rest A1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for vacuum press-forming a laminate such as a single copper-clad laminate or a multilayer board in a short period of time by pressing several times. This invention relates to a novel method for continuously manufacturing laminates and an apparatus therefor. It is particularly suitable for production lines for manufacturing laminated boards such as multilayer boards, and has excellent physical properties and production suitability.

[Conventional technology]

The conventional manufacturing method for multilayer boards is to purchase copper-clad laminates, interlayer bonding prepregs, copper foils, etc., manufacture inner-layer boards by forming printed wiring for inner layers on the copper-clad laminates, and then produce copper foil/prepreg. /Inner layer plate/Prepreg.../Inner layer plate/Prepreg/
A product is made by combining laminated materials such as copper foil, press-molding this, plating through holes, forming outer layer wiring, etc. as appropriate. In addition, the external dimensions of some products are 800 m.
There are larger ones such as rn angle, but generally it is 500m.
The weight is less than m square, and vacuum press molding is extremely suitable for press molding.

On the other hand, copper-clad laminates are manufactured by laminate manufacturers using huge multi-stage presses, etc., and are designed to improve yields and eliminate waste at edges.
Furthermore, 1.000 I+1m x 2.000 mm
Square ones are also manufactured. On the other hand, in order to improve productivity, production by continuous pressing has been intensively studied, but continuous pressing has not yet been able to produce copper-clad laminates or multilayer boards with good physical properties for general purposes.

[Issues with conventional technology]

The inventors of the present invention have intensively studied the practical application of continuous presses. As a result, it was found that instead of the method for producing a cured copper-clad laminate, a method for producing a semi-cured copper-clad laminate is more suitable for continuous pressing. However, in continuous pressing, it has been virtually impossible to universally manufacture multilayer boards using inner layer boards manufactured in conventional printed wiring board manufacturing processes.

Therefore, the inventor of the present invention has developed a method for manufacturing semi-cured resin copper-clad laminates, by combining the knowledge of void-free production through vacuum press molding and the concept of one laminate with one breath, to improve the production of conventional printed wiring. It was discovered that a laminated molding process more suitable for the plate manufacturing process could be obtained, and the present invention was completed.

[Means to solve the problem]

That is, in the present invention, a pre-assembled laminate set is heated to a vacuum degree of 100 below the melting temperature of the prepreg-impregnated resin.
The pressure is reduced to below Torr, the prepreg is introduced between press hot platens under reduced pressure, the prepreg is pressurized, and the resin of the prepreg is made to the desired degree of hardening, the press pressure is released, and the press-formed laminate is taken out. A method for producing a laminate by a vacuum semi-continuous press as a cycle, the laminate set and the laminate being transferred under reduced pressure by movement of an endless metal foil belt. A method for manufacturing a laminate, in which the endless metal foil belt is entirely housed inside the vacuum system of a depressurized semi-continuous press;
The endless metal foil belt is stretched only on the lower surface, and furthermore, the endless metal foil belt is made of stainless steel or W4 metal foil, and one or both ends thereof are cleaned and coated with a release agent as appropriate. This is a method of manufacturing a laminate in which parts are added.

Furthermore, the present invention provides a preliminary vacuum chamber (A) for holding the laminate set at reduced pressure, a press machine (B), and a take-out chamber (C) capable of holding the laminate set at reduced pressure, which are connected in series in this order. Means for transferring the board (D) and the above ^, B
, C is a reduced pressure semi-continuous press apparatus having at least a vacuum system with reduced pressure, and the transfer means includes holding and transferring sections (M), , M2 of endless mirror-finished foil belts in the preliminary vacuum chamber A and the take-out chamber C, respectively. ), and the endless mirror foil belt is movably stretched from the preliminary vacuum chamber type to at least the floor of the take-out chamber C, and the press machine B is at least 2
A vacuum semi-continuous press consisting of tables arranged in series, a laminate material setting table (A1) capable of reducing pressure in the preliminary vacuum chamber A, and a laminate plate table (C1) capable of reducing pressure in the extraction chamber C. It is a device.

The configuration of the present invention will be explained below.

The laminated materials constituting the laminated material set of the present invention include conventional copper-clad laminates, copper foil used in multilayer boards, prepreg (hereinafter referred to as PP), and single-sided copper-clad laminates (hereinafter referred to as single-sided laminates). ), materials such as printed wiring boards with printed wiring on one side and no wiring on the other side (hereinafter referred to as single-sided PWB), printed wiring boards for inner layers (hereinafter referred to as P%IB), and new applications for these. Any material developed for this purpose can be used, and is not particularly limited, but in particular, from the characteristics of the reduced pressure semi-continuous press process of the present invention, the smaller the resin flow distance from the end of the PP during press molding, the smaller the PP material. It is preferable that the resin flow to the surrounding area is 10m+n or less, and if resin powder or glass powder comes out from the PP end, it will cause the product to be rejected, so it is better to use dust-free PP. . Note that depending on the type of PP with a long resin flow distance or the type of printed wiring pattern for the inner layer, the resin flow may be large only in a specific location. Use a wide copper foil, add unevenness to the surrounding copper foil, attach paper tape around the copper foil, or take other measures to prevent spilled resin from flowing onto mirrored plates, endless metal foil belts, etc. It is preferable to apply a mold release agent to a mirror plate, an endless metal foil belt, or the like.

Furthermore, the pre-combined laminate set of the present invention is a combination for a single-sided copper-clad laminate made by the conjugation method of copper foil/- or more sheets of PP (hereinafter referred to as MPP)/release film/MPP/copper foil. , combination of laminate materials for double-sided copper-clad laminates of copper foil 7MPP/copper foil, copper foil/MPP/PWB/MPP/--
---/Pv4B/MPP/Copper foil, single-sided board/MPP/P
IIIB/MPP/-.../PWB/MPP/Single-sided board, single-sided PWB/MPP/PltlB/MPP/...
.../PIliB/MPP/Single-sided PWB 5PWB
/MPP/.../PIIB/MPP/PWB, etc. are combinations for copper-clad laminates and multilayer boards, such as combinations of laminate materials for multilayer printed wiring boards, and these laminate material sets are laminate materials. Part or all of the part can be temporarily fixed using a jig such as an outer peripheral eyelet or a method such as fusion,
In particular, in the case of materials that require alignment between laminated materials, fixing with a jig such as an eyelet is suitable. In addition, in the present invention, it is not usually necessary to have a configuration in which the mirrored plates are stacked on both sides of the laminate material set, and the weight and heat capacity of the laminate material set can be made extremely small, and the transfer and thermal efficiency can be improved. , it is also possible to arrange mirrored plates in a laminate set. In addition, to prevent wrinkles from occurring in the copper foil during the transfer of the laminate material set, to prevent contamination of the press machine due to resin flow, and to balance heat transfer within the press machine, surface irregularities should be 1 p or less. It is preferable to use a combination of thin plates such as thin stainless steel or steel plates having a thickness of about 50 to 200 mm, or laminated plates made by laminating these plates together.

In the present invention, the above-mentioned laminate material set is placed on an endless metal foil belt, and first, at a temperature below the melting temperature of the PP-impregnated resin for a necessary and sufficient time under a reduced pressure of 100 Torr or less, preferably 60 Torr or less, particularly 2Q Torr or less. A preliminary vacuum treatment is performed to remove most of the air between and within the laminated materials.

Here, if the temperature of the reduced pressure treatment is higher than the melting point of the PP-impregnated resin, it is difficult to efficiently remove air in a short time.
Further, the processing time is the time until the degree of pressure reduction is reached to 100 Torr or less, particularly until the degree of pressure reduction is reached to 20 Torr or less.

Next, the endless metal foil belt is moved a predetermined distance, and the laminate material set is introduced into a heated hot platen press machine while substantially maintaining the degree of reduced pressure of the preliminary vacuum treatment, where the laminate material set is The temperature is raised and pressure is applied to melt the PP-impregnated resin, fluidize the resin, completely fill the gaps, and then perform a vacuum press to cause a curing reaction. In addition, prior to press molding, preheating to melt the PP-impregnated resin is carried out as appropriate, and the preheating method is to introduce the laminated material set so that it does not come into direct contact with the upper and lower heating plates. A method of raising or lowering the hot platen so that it comes into contact with the upper and lower hot notes at the same time as the press is closed;
A method of providing a preheating chamber having heating devices above and below between the preparatory vacuum chamber and the press machine; a method of arranging two or more press machines in series and using the first press machine as a low-temperature press machine may also be used.

Pressure and heating conditions can be suitably within the range of conventional multistage presses, that is, pressure of 100 kg/eIIf or less and temperature of 400°C or less, but in the present invention, since it is a vacuum press, high pressure is not required. It is possible to make the film sufficiently void-free at a pressure of about 20 kg/cd. Further, high temperatures are preferable from the viewpoint of rapidly advancing curing and improving productivity, but in the present invention, it is not necessarily necessary to completely cure the material, and it is within the range that can be completely cured by post-curing as appropriate. is sufficient. If the PP matrix resin is an epoxy resin, the guideline is the time such that the adhesive strength of the copper foil is 0.3 kg/cm or more (approximately 120°C as a glass transition temperature). Select from the range of 30 seconds to 10 minutes. Note that if the thermal gelation reaction is rapidly carried out at high temperatures, it may not be possible to achieve the chemical resistance or water resistance that is achieved by normal curing, even by post-curing. When using PP, it is preferable to proactively use preheating as described above.In particular, two or more vacuum presses are arranged in series to heat press on the low temperature side and press on the high temperature side. It is preferable to use a hot press at the same time.

Since the vacuum press molding of the present invention is based on -brace/-laminates, there is no need to use a mirror plate or the like for each cushioning material or laminate material set used in ordinary multi-stage presses. Mirror plate or surface unevenness on heating plate 1
A steel plate with a surface roughness of 1ρ or less is attached, or an endless metal foil belt is used as a stainless steel or steel metal foil with a surface roughness of 1ρ or less. As described above, the endless metal foil belt is preferable from the viewpoint of the appearance of a laminate made of press-formed metal foil made of stainless steel or steel with a surface roughness of 1 m or less, but aluminum foil, copper foil, and other metal foils are also preferable. A heat-resistant resin film can also be used, and is particularly suitable when an auxiliary plate is used in a laminated material set.

The semi-cured or cured resin laminate of the present invention produced by vacuum press molding is removed by moving the endless metal foil belt a predetermined distance after releasing the press machine plate. Usually, in the present invention, a method is used in which a take-out part that can be maintained in a reduced pressure state is provided, and the material is transferred to this take-out part and taken out to the outside. Note that the take-out section may also serve as a cooling section.

In addition, in the above, since the laminate material set or the laminate plates are moved between each part using an endless metal foil belt, it is difficult to use a vacuum door such as a knife shutter. For the purpose of reducing the pump load, it is preferable to provide an auxiliary vacuum chamber at each of the laminate material set input port and the laminate plate removal port, and further partition each part with a partition that can be opened and closed and has substantially no leakage.

The vacuum system of the present invention is usually designed in consideration of the preliminary vacuum treatment, the press machine, the capacity of the take-out section, the endless metal foil belt holding and transfer section for transfer, the volume of other storage space, and the time required to reach the desired degree of vacuum. , basically consists of a vacuum pump, piping, and valves with a slightly larger exhaust capacity so as to reach the desired degree of vacuum in 2 minutes or less, preferably 1 minute or less, especially 30 seconds or less. It is preferable to adopt
As mentioned above, partitions that can be opened and closed and have virtually no leakage should be placed between each unit consisting of the preliminary vacuum processing, press machine, and take-out section, and the actual volume of each unit should be kept as small as possible to reduce leakage. It is preferable to design.

Furthermore, dust entering the manufacturing process can cause product defects, so it is preferable to keep the environment around the press machine clean, especially when transporting the laminate set and taking out the laminate. The air introduced at the time should be filtered.

〔Example〕

Next, the manufacturing apparatus used in the above-described method of manufacturing a laminate using the novel vacuum semi-continuous press of the present invention will be described with reference to drawings showing examples thereof.

Figure 1.2 shows an example of a device consisting of the basic structure of the reduced pressure semi-continuous press machine of the present invention, in which an endless metal foil belt is placed on the floor surface and an endless metal foil belt is placed above and below, respectively. . Fig. 3.4 is a schematic diagram of the planar arrangement when a laminate material set supply section and a laminate take-out section are added, and when loading and unloading in the moving direction and loading and unloading from the lateral direction are performed, respectively. be.

This device in Figure 1.2 consists of a preliminary vacuum chamber (A), a press machine (B), and a press machine (B).
) and the take-out chamber (C) are connected in series in this order, and the preliminary vacuum chamber A is equipped with a vacuum shutter (V) for the laminate set intake, and the take-out chamber C is equipped with a vacuum shutter (V) for taking out the laminate. In addition, an endless metal foil belt storage and transfer section (Ml, M2) is provided at the opposite end of the preliminary vacuum chamber A and take-out chamber C from the brushing machine, and the laminate material set and the laminate plate are stored under reduced pressure. It is designed to be able to be transported by

Further, the preliminary vacuum chamber A is provided with a transfer means for introducing the laminated material set from the laminated material set table (A1).

In addition, Figure 3.4.5 shows C in which the laminate material set and the laminate are fed (A1) or taken out in the equipment shown in Figure 1.2.
1) This is an example of the arrangement when the tables for
In the case of the figure, a bidirectional coupling format as shown in FIGS. 3.4 and 5 is possible, and in FIG. 2, a Zide direction coupling format as shown in FIG. 5 is adopted. Further, FIG. 4 shows a case where A1 and C1 can be depressurized, and FIG. 5 shows an example of the arrangement when a low-temperature press machine and a high-temperature press machine are used as press machines.

To explain the manufacturing process with reference to Figures 3 and 5, a predetermined laminate set is placed in a predetermined position on the laminate set table A1, the vacuum shutter V is opened, and the transfer tool provided in the preliminary vacuum chamber A is placed. The laminate set is carried into the preliminary vacuum chamber A, the vacuum shutter is closed, and then the pressure is rapidly reduced by a vacuum pump to a predetermined pressure of 100 Torr or less. Press machine B, which has performed a prescribed press, is opened and the endless mirror-finished metal foil belt is moved by a prescribed amount, and accordingly, the laminate set and the press-formed laminate are respectively transferred onto the heating plate of the press machine and into the take-out chamber. , the laminate set is pressure pressed, and the laminate is cooled if necessary. When the pressure pressing of the laminate set in the press machine reaches a predetermined stage, the vacuum shutters of the preliminary vacuum chamber A and the take-out chamber C are opened, and the laminate set is introduced into the preliminary vacuum chamber A and the laminate is removed. and take out.

By repeating the above cycle, a laminate plate according to the manufacturing method of the present invention is continuously manufactured.

In addition, in the above method, if a vacuum shutter is further arranged before and after the press machine B, or if the laminate material setting table A1 and the laminate plate table C1 are configured to be able to maintain a vacuum as shown in FIG. The advantage arises that it is no longer necessary to insert the laminate set into the container and to take out the laminate.

Although the present invention has been explained using drawings, the present invention
The present invention is not limited to the drawings as long as a vacuum semi-continuous press is used, which is characterized in that the laminate material set is subjected to preliminary vacuum treatment and then heated and press-molded.

[Operation and effects of the invention]

As is clear from the detailed description of the invention, the method and apparatus for producing a laminate using vacuum semi-continuous pressing of the present invention involves pre-vacuum treatment and subsequent vacuum pressing, which eliminates voids. It is easy to handle, and has excellent dimensional accuracy and other physical properties because there is virtually no occurrence of defects such as cracking, and because the laminated material set does not use a mirror plate and is made of one breath and one laminated sheet. It is now possible to manufacture laminates with excellent quality. Furthermore, by using two or more press machines in series, it is possible to produce a good semi-cured or cured laminate using any prepreg.

Furthermore, press molding is essentially possible using fully automatic equipment, and it can be easily incorporated into existing manufacturing processes for printed wiring boards, multilayer boards, etc.
Its industrial significance is extremely high.

[Brief explanation of drawings]

FIGS. 1 and 2 show schematic diagrams of the reduced pressure semi-continuous press apparatus of the present invention, and FIGS.
The figure shows a schematic plan view of the vacuum semi-continuous press apparatus of the present invention. Patent Applicant Mitsubishi Gas Chemical Co., Ltd. Agent (9070) Patent Attorney Sadafumi Tebori Figure 1 Second Figure 3 V Vacuum Shafter ν” = Vacuum Shafter Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1 The pre-combined laminate set is reduced to a vacuum level of 100 Torr or less at a temperature below the melting temperature of the prepreg-impregnated resin, introduced between press hot platens under reduced pressure, and pressurized to remove the resin of the prepreg. A method for manufacturing a laminate by semi-continuous press under reduced pressure, in which one cycle consists of curing the material to a desired degree, releasing the press pressure, and taking out the press-formed laminate, the method comprising: the laminate set and the laminate; A method for producing a laminate using a vacuum semi-continuous press, characterized in that the board is transferred under reduced pressure by moving an endless metal foil belt. 2. The method for manufacturing a laminate according to claim 1, wherein the endless metal foil belt is entirely housed inside the vacuum system of a reduced-pressure semi-continuous press. 3. The method of manufacturing a laminate according to claim 2, wherein the endless metal foil belt is stretched only on the lower surface. 4. The method for producing a laminate according to claim 2, wherein the endless metal foil belt is made of stainless steel or steel metal foil, and a cleaning and release agent coating section is added to one or both ends as appropriate. 5 At least a preliminary vacuum chamber (A) for holding the laminate set under reduced pressure, a press machine (B), and a take-out chamber capable of holding the laminate set under reduced pressure (
C) are connected in series in this order, and has at least a means (D) for transporting a laminate material set and a laminate plate, and a vacuum system for reducing the pressure in A, B, and C, The transfer means D includes a holding transfer section (M1) of an endless mirror foil belt in the preliminary vacuum chamber A and the take-out chamber C, respectively.
, (M2), and the endless mirror foil belt is placed in a preliminary vacuum chamber A.
A reduced pressure semi-continuous press device, characterized in that it is movably stretched at least on the floor of a chamber C. 6. The vacuum semi-continuous press apparatus according to claim 5, wherein at least two press machines B are arranged in series. 7 In the preliminary vacuum chamber A, a laminate material setting table (A1
) and a laminate plate stand (C1) that can reduce the pressure in the extraction chamber C.
5. The vacuum semi-continuous press apparatus according to claim 4, further comprising: