JPS6354545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous method for manufacturing a laminate.

There are the following methods for manufacturing laminates used for electrically insulating substrates and the like. That is, an unsaturated resin having an unsaturated bond such as an unsaturated polyester resin, diallyl phthalate resin, or vinyl ester resin is diluted with a vinyl monomer (crosslinking agent), etc.
Furthermore, a polymerization initiator is added to create an unsaturated resin varnish, and a base material such as a strip of paper or glass cloth is impregnated with this to continuously create a resin-impregnated base material. next,
A plurality of sheets of this resin-impregnated base material are stacked while being transferred, and if necessary, strip-shaped copper foil, release film, etc. are stacked while being transferred to continuously form a laminate. Next, a laminate is continuously produced by heating the laminate under no pressure while transferring it,
This method involves cutting this into desired dimensions.
This method does not involve placing each laminate in a press and applying heat pressure, but instead laminates the resin-impregnated base material while transferring it, and heat-cures the resulting laminate under no pressure while transferring the resin-impregnated base material. Since the method involves continuously manufacturing laminates, production efficiency is high. In addition, when producing unsaturated resin varnish, the unsaturated resin is diluted with a crosslinking agent rather than with a solvent to create the varnish, so there is no need to use a solvent, which is advantageous in terms of resource savings. .

However, in this continuous non-pressure forming method, the long strip-shaped laminate obtained in the lamination process is placed on a line as it is and heated and cured, so tension is applied to the laminate during transfer on the line, which causes There was a problem that it appeared as undulations (including undulations and wrinkles) and was fixed by heat curing and remained on the laminate product. In addition, the laminated body after lamination is sent to a heating furnace (cure furnace) without cutting and is cured therein, so the lamination process and heat curing process are related to each other, and therefore the entire laminate manufacturing process The line speed is regulated by the transfer speed of the laminate in the curing furnace, and there is also the problem that no further improvement in productivity can be expected. In other words, in a curing furnace, if the temperature rises rapidly, there will be problems such as, for example, only the outside of the laminate will be cured first and the inside will be difficult to harden. It is necessary to set limits on temperature and hot air volume, and to slow down the line speed in the heat curing process so that heating takes a certain amount of time.As a result, the line speed in the lamination process is unnecessarily suppressed. It was. Furthermore, although it is necessary to maintain the most favorable operating conditions in each of the laminating process and the heating process, there is a problem that this cannot be achieved if the two processes are related to each other.

This invention was made in view of these circumstances, and it provides a laminate that has less waviness, undulations, and wrinkles (hereinafter referred to as "undulations, etc."), has high production efficiency, and can produce a high-quality laminate. It provides a manufacturing method. This will be explained below.

In other words, the continuous method for producing a laminate according to the present invention involves laminating continuously supplied resin-impregnated base materials while transferring them, and heating and curing the obtained laminate under no pressure to continuously produce a laminate. In the method of
At an appropriate stage after lamination and before curing occurs, the laminate of the resin-impregnated base material is cut into suitable dimensions, and each cut laminate is divided into multiple lines and transferred while being heated and cured. It is a feature.

Hereinafter, the present invention will be described in detail based on drawings showing embodiments.

FIG. 1 is a schematic diagram showing an example of the manufacturing method according to the present invention. As shown in the figure, similarly to the conventional method, a strip-shaped base material 1 wound into a roll is continuously fed in the direction of arrow A by a plurality of sheet feed rolls 2. Next, each base material 1 is impregnated with resin by dropping unsaturated resin varnish from the upper resin supply device 3, respectively, to obtain a strip-shaped resin-impregnated base material 1'... . These plurality of resin-impregnated base materials 1'... are formed by a pair of upper and lower rolls 4,
4 to form a strip-shaped laminate 5. A strip-shaped release film 6 and a copper foil 7 are superimposed on the front and back surfaces of this laminate 5 by laminating rolls 8, 8. The copper foil 7 to be laminated here is coated with adhesive resin by dropping adhesive resin from the resin supply device 9, and then preheated in the heating furnace 10. In this embodiment, copper foil and release film are overlaid on the front and back surfaces of the laminate 5, but depending on the purpose of use of the laminate, copper foil or release film may be overlaid on only one side or both sides. , and there are cases where nothing is superimposed on either side.

In the conventional method, the laminate 5, which may or may not be overlaid with copper foil, release film, etc., is continuously sent to a heating furnace as a strip without being cut, where it is heated and hardened under no pressure to form a laminate. becomes.
On the other hand, in the manufacturing method according to the present invention, after the lamination process, the strip-shaped laminate (including those made by overlapping copper foil, etc.) 5 is pulled out from the laminate rolls 8, 8 by a pull-out device such as pull-out rolls 11, 11. The material is then sent to the cutter 12, where it is cut into appropriate dimensions.

The purpose of cutting here is to produce the following effects. In other words, by shortening the dimensions of the laminate, tension is not applied and the occurrence or increase of waving is prevented as much as possible, and waving, etc. that once occur before or after this cutting process can be removed by removing tension. Then I will make this disappear. This cutting separates the lamination process and heat curing process, so the overall line speed for laminate manufacturing is not limited by the line speed in the heating process, so it is possible to increase the number of lines in the curing furnace as described below. By doing this, you can increase your speed. The lamination process is a lamination process, and the heat curing process is a heat curing process, each of which can maintain its own favorable operating conditions. In the heat curing process, we operate under unique conditions to eliminate or prevent the occurrence of waviness, in the lamination process we select our own optimum conditions to improve adhesion, and in the heat curing process we select our own optimum conditions to ensure uniform curing. You can choose the conditions.

Even if there are multiple transfer lines after cutting, the distance of the production line can be prevented from increasing by arranging each line in parallel. Therefore, it can be said that the manufacturing method of the present invention, which does not involve an increase in line length, is extremely useful in this respect as well.

It is preferable to cut as soon as possible after the completion of the lamination process, as this will reduce waving caused by the tension. Furthermore, when cutting the laminate, it is better to shorten it because if it is too long, tension will be applied easily, and it is also preferable to cut the laminate to the desired product size as it is after heating and curing.

The cut laminate 5'... is then distributed into several lines by the distribution belt 13 and sent to the cuer furnace 1.
4, and is transferred through the curing furnace 14 in several lines using a transfer device such as a steel belt 15, thereby being heated and cured under no pressure. In this embodiment, the number of lines in the curing furnace is three, but by increasing this number, it is possible to increase the overall line speed for manufacturing the laminate. However, instead of heat-curing while transferring, a large amount of the laminate may be fed into a curing furnace, arranged, heat-cured under no pressure, and then transported out.

The cured laminate 5'' is sent out by a delivery belt 16 and, if necessary, further cut into desired dimensions with a cutter to form a laminate product 17.

The continuous manufacturing method of the laminate according to the present invention is to cut the laminate into short lengths and heat harden them instead of keeping them in a long shape, so that a high quality laminate with good smoothness can be obtained. By transferring the material along the line, it is possible to increase the speed of the production line and increase production efficiency, and by arranging a plurality of transfer lines in parallel, the length of the production line can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the manufacturing method according to the present invention. 5...Laminated body, 5'...Laminated body after cutting, 5''...
... Laminate after curing, 11 ... Drawer roll, 1
2... Katsuta, 14... Cure furnace, 15... Steel belt, 17... Laminate plate product.

Claims (1)

[Claims] 1. In a method of continuously manufacturing a laminate by laminating continuously supplied resin-impregnated base materials while transferring them, and heating and curing the obtained laminate under no pressure,
At an appropriate stage after lamination and before curing occurs, the laminate of the resin-impregnated base material is cut into suitable dimensions, and each cut laminate is divided into multiple lines and transferred while being heated and cured. Continuous manufacturing method for laminated sheets.