JP2898454B2 - hot press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot press for forming a multilayer printed wiring board and the like.

[0002]

2. Description of the Related Art When a pressurized object placed between hot plates is heated and pressed, as the fluidity of a resin component of the pressurized object increases, the molten resin tends to flow to the outer periphery. I do. Conventional hot presses usually do not have means for preventing molten resin flowing out on the outer periphery of a flat hot plate. For this reason, at the outer peripheral portion of the molded product, there are problems such as the resin that has flowed out becoming burrs and a portion that cannot be used as a product due to insufficient pressing force due to thinning due to resin outflow. I tended to.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot press capable of preventing the resin from flowing out to the outer periphery of the object to be pressed and degassing.

[0004]

[Means for Solving the Problems] To solve the problems,
The outer periphery is almost the same as the outer periphery of the hot plate, the inner periphery has a slight gap with the outer periphery of the object to be placed on the hot plate, and the heat resistance is the same as the thickness of the object to be pressed A hot plate enclosing means for disposing an elastic frame having the following structure between each hot plate, allowing the hot plate to ascend and descend, and enclosing the outer periphery of the hot plate with a slight gap; and According to the above, the elastic frame was made air-permeable, and the space inside the hot plate surrounding means was made a hot press capable of being suctioned and deaerated by a vacuum pump.

[0005]

This configuration allows air existing between the layers of the object to be pressurized or gas generated from the inside to be degassed to the outside before the start of hot press or at the time of pressurization at an extremely low pressure in the initial stage. By increasing the amount of compression of the elastic frame as the pressing force increases, a pressing force is generated between the hot plate surrounding means and the outer periphery of the object to be pressed, thereby preventing the molten resin from flowing out.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment according to the present invention will be described with reference to FIGS. 1 is a pressing cylinder of a hot press and 2 is an upper plate located above the pressing cylinder 1. The pressing cylinder 1 is fixed on the upper surface of the lower frame 3 with its flange mounted thereon.
To the upper panel 2. Reference numeral 5 denotes a movable plate which can be moved up and down with respect to the upper plate 2 in the press body 4, and is attached to the tip of a pressing ram 6 inserted into the pressing cylinder 1.

Reference numeral 7 denotes a plurality of hot plates provided between the upper plate 2 and the movable plate 5. Of the plurality of hot plates 7, the uppermost one is fixed to the upper plate 2 via the heat insulating member 8, and the lower one is fixed to the movable plate 5 via the heat insulating member 8, and the remaining intermediate hot plate Numerals 7 are respectively arranged so as to keep a predetermined interval when descending.

An opening 9 is formed in the front surface of the press body 4 from the lower surface of the upper plate 2 to the vicinity of the upper surface of the movable plate 5 when it is lowered in order to enable the object to be pressed to be inserted into and removed from the hot plate 7. Are formed. A shutter 10 capable of opening and closing the opening 9 is provided as shown in FIG. 2 (not shown in FIG. 1 corresponding to the front view). The shutter 10 is normally located above the hot press, for example, and is lowered during the press to cover the opening 9. However, the shutter 10 is a known technique, and a detailed description thereof will be omitted.

Reference numeral 11 denotes an elastic frame. Reference numeral 12 denotes a pressurized object placed inside the elastic frame 11 and placed on the upper surface of the hot plate 7. The elastic body frame 11 can be, for example, a solid frame body having continuous pores having gas permeability and elasticity, or a hollow frame body which can be expanded by introducing gas or fluid. You can also. In addition, by heating or cooling the gas or fluid introduced into the hollow elastic frame, a desired temperature can be given to the outer periphery of the pressurized object 12. The elastic body frame 11 preferably has heat resistance and excellent releasability. For example, a material such as Teflon or silicon can be used.

The relationship among the press body 4, the hot plate 7, the elastic frame 11, and the object to be pressed 12 will now be described. The inner wall of the press body 4 including the shutter 10 has a hot plate 7
The heating plate 7 has a small gap to allow
And close. That is, in the present embodiment, the press body 4 is a strength member that fastens the pressing cylinder 1 and the upper platen 2 and receives a tensile stress according to the pressing force at the time of pressurization, and also serves as a hot plate surrounding means. . The outer periphery of the heating plate 7 is almost the same as the heating plate 7, the inner periphery of the heating plate 7 has a slight gap with the outer periphery of the object to be pressed 12, and the thickness of the heating plate 7 is the same as that of the object to be pressed 12. A similar elastic frame 11 is placed together with the object to be pressed 12. That is, a predetermined gap is provided between each of the hot plate surrounding means, the elastic body frame 11 and the object to be pressurized 12 so as to avoid contact before pressurization and to prevent elasticity during pressurization. When the body frame 11 is compressed, the outer peripheral side surface of the object to be pressed 12 is pressed and sealed while the outer periphery thereof is held by the hot plate surrounding means. The predetermined gap needs to be determined based on the thickness and compression amount of the elastic body frame 11 and the object to be pressed 12, but usually the surface pressure acting on the outer periphery of the object to be pressed 12 during pressing is 1kg to 3k per square cm
If it is determined to be within the range of about g, the outflow of the resin can be sufficiently prevented.

The press body 4 may be appropriately provided to dispose the hot plate 7 at a predetermined interval, for example, to provide a claw and a step plate, or to provide piping or wiring to the hot plate 7. Although a notch is formed, a detailed description and illustration are omitted since a known technique is applied in any case. By the way, the object to be pressurized 1 before the hot plate is raised or at the time of low-pressure pressurization in the initial stage of pressurization.
If it is necessary to forcibly degas air or gas between the two layers or inside, the hot press can be a vacuum hot press. In this case, for example, a sealing member 13 indicated by a virtual line in FIGS.
Finally, the space inside the hot plate surrounding means is configured to be able to be sucked by a vacuum pump. The technology related to the vacuum hot press is already known, and further description is omitted.

Next, a second embodiment will be described with reference to FIGS. In the description of the second embodiment,
Mainly, portions different from the first embodiment will be described.
Reference numeral 20 denotes front and rear frames of the hot press, which are strength members that receive a tensile stress according to a pressing force.
Unlike the first embodiment, the frame 20 does not constitute the hot plate surrounding means.

Reference numeral 21 denotes a plurality of hot plates. Unlike the case of the first embodiment, convex portions 21A are provided integrally with the hot plates 21 at both ends in the insertion direction of the intermediate hot plate and the lowermost hot plate. I have. The lower portion of each hot plate 21 is fitted into the male and female with a slight gap with the convex portion 21A, so that the convex portion 21A becomes a part of the hot plate surrounding means of the hot plate 21. Reference numeral 22 denotes a shutter capable of opening and closing the front and rear openings of each heat plate 21 where the convex portions 21A are not provided. The shutters are provided on the front and rear surfaces of the frame 20, respectively. Needless to say, the shutter 22 is provided only on the front side of the frame 20 when the convex portion 21A of the hot plate 21 is also provided on the outer peripheral portion behind the hot plate. Then, the protrusion 21A and the shutter 2
2 completes the hot plate surrounding means.

When the hot press is a vacuum hot press, the space inside the hot plate surrounding means is surrounded by a sealing member 23 so as to be able to be sucked by a vacuum pump. In the case of the present embodiment, a space can be freely provided on both sides of the convex portion 21A of the heating plate 21. Therefore, compared to the first embodiment, piping to the heating plate 21 or the elastic body frame 11 or the like of the stepped plate can be provided. Attachment (neither is shown) or the like is easy, but the configuration of the hot plate 21 is complicated because the hot plate 21 has the convex portion 21A.

As described above, the second embodiment is mainly described in the first embodiment.
The difference from the embodiment has been described. Other basic technical ideas and configurations are the same as those in the first embodiment, and thus description thereof is omitted.

Next, the operation of the first embodiment will be described with reference to FIGS. An elastic frame 11 and a pressurized object 12 having a predetermined gap with an inner periphery of the elastic frame 11 on the hot plate 7
Is placed. The shutter 10 moves down to cover the opening 9,
The outer periphery of the hot plate 7 in the press body 4 is surrounded.

In the case of a vacuum hot press, the space in the sealing member 13 and the space in the hot plate surrounding means can be suctioned in vacuum in this state, that is, before the hot plate is raised and closed. As a result, for example, if the object to be pressurized is a multilayer wiring board, the air between the layers can be suctioned and degassed in advance, and the molded product is burned due to voids and compression of the residual air. Can be prevented.

Hydraulic oil is supplied to the pressing cylinder 1 from a hydraulic drive (not shown), and the pressing ram 6 and the movable platen 5 start to rise. The hot plate 7 rises sequentially as the movable platen 5 rises. The pressing of the pressurized object 12 by the initial extremely low pressure is started, the elastic body frame 11 receives a slight compression, the inner periphery thereof comes into contact with the outer periphery of the pressurized object 12, and the outer periphery thereof is heated plate surrounding means. That is, it comes into contact with the respective inner walls of the press body 4 and the shutter 10. With the passage of time, the resin component of the pressurized object 12 undergoes gelation (fluidization) due to the heating from the hot plate 7 and gas generation is observed.

At this time, by employing the solid elastic frame 11 having continuous pores having gas permeability, the generated gas can be easily released to the outside. The generated gas can be forcibly degassed.

When a predetermined pressing force is applied, the pressurized object 12 is compressed to a predetermined molded product thickness, and at the same time, the compression amount of the elastic body frame 11 is increased, and the hot plate surrounding means and the pressurized object 1 are compressed.
2, the pressing force between them increases, and the outflow of the molten resin component to the outside is prevented.

When the resin component is hardened and a predetermined cooling process is completed, the hydraulic oil of the pressing cylinder 1 is returned to the tank of the hydraulic drive device, and the pressing ram 6, the movable platen 5, and the hot plate 7 are lowered by their own weight. The opening 9 is formed again by raising the shutter 10, and the molded product can be taken out of the hot press.

It is to be noted that, by adopting a hollow body for the elastic body frame 11 and introducing a temperature control medium heated or cooled to a predetermined temperature into the elastic body frame 11, a pressurized medium having no contact with a hot plate can be obtained. The outer periphery of the object 12 can be heated and cooled.

The operation of the first embodiment has been described above. The second embodiment is similar to the first embodiment and will not be described.

[0024]

According to the present invention, since air, gas, and the like existing inside the object to be pressurized can be discharged to the outside of the hot press, a molded article free from voids and burns can be obtained.
Furthermore, since the resin component of the object to be pressed can be prevented from flowing out, a molded article having a uniform thickness and uniformity over the entire area of the molded article can be obtained. Also, since there is almost no flow of the resin component, there is no residual distortion of internal stress, and in the case of a multilayer board, it is possible to obtain a molded product having no displacement between layers. Since there is no flash of burrs on the outer periphery, effects such as omission of a step of cutting and removing a defective portion and improvement in material yield can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of an essential part for explaining a first embodiment of the present invention, in which a hot plate is in a lowered state.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a front view of an essential part for explaining a second embodiment of the present invention, in which a hot plate is in a state of being raised and closed.

4 is a view taken in the direction of arrows IV-IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressing cylinder 2 Upper plate 4 Press body (Hot plate surrounding means) 7 Hot plate 9 Opening 10 Shutter (Hot plate surrounding means) 11 Elastic frame 12 Pressurized object 13 Sealing member 21 Hot plate 21A Convex portion (Hot plate Surrounding means) 22 Shutter (Hot plate surrounding means) 23 Sealing member

Claims (7)

(57) [Claims] 1. An outer periphery is substantially the same as an outer periphery of a hot plate, and an inner periphery has a slight gap with an outer periphery of a pressurized object placed on the hot plate, and has a thickness equal to that of the pressurized object. A hot plate enclosing means for disposing an elastic frame having substantially the same heat resistance between the hot plates, allowing the hot plates to move up and down, and enclosing the outer periphery of the hot plate with a small gap. A hot press characterized by having. 2. A heating plate surrounding means for connecting a pressing cylinder and an upper plate located above the pressing cylinder, and partly enabling supply and removal of the object to be pressed to and from the heating plate. The hot press according to claim 1, wherein the hot press is a box-shaped press body having an opening and a shutter for opening and closing the opening. 3. A convex portion integrally provided with the hot plate on two or three sides of an outer peripheral portion of the hot plate in a state where the hot plate surrounding means allows mutual fitting of the hot plate with the male and female. The hot press according to claim 1, further comprising a shutter provided for a portion where the protrusion is not provided. 4. The hot press according to claim 1, wherein said elastic body frame has continuous pores having air permeability. 5. The hot press according to claim 1, wherein the elastic frame has a hollow state that can be expanded by introducing a gas or a fluid. 6. The hot press according to claim 5, wherein said gas or fluid is heated or cooled to a predetermined temperature. 7. The hot press according to claim 1, wherein the space inside the hot plate surrounding means can be suctioned and deaerated by a vacuum pump.