JPS63283905A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet which has few voids and is superior in moldability and heat resistance by improving resin impregnation properties of a base material with resin varnish, by a method wherein the base material under a state where it is wound up round a wind-up roll is prepressurized by a press roll. CONSTITUTION:A base material 2 under a state where it is wound up round a wind-up roll 1 is prepressurized by a press roll 3. A coating film on the surface of the base material 2 is destroyed through this prepressurization. As the base material 2 is pressurized over and over again while the same is being rewound, a destruction effect of a film in case of a surface treatment agent such as a coupling agent becomes high. The base material 2 is dipped into a resin varnish tank by rewinding the same, the same is impregnated with the resin, dried, and a prepreg is formed. A plurality of the prepregs formed in this manner are piled up, integrated through heating, pressurizing and molding and a laminated sheet is manufactured.

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to a method for manufacturing a laminate with fewer voids by prepressing a base material to improve the resin impregnation of a resin varnish into the base material.

[Background technology]

For example, glass cloth, which is often used as a base material, has a coupling agent applied to its surface, and the entire cloth is coated with this coupling agent.
For this reason, the impregnating properties of the resin varnish in the resin varnish impregnation step have deteriorated. For this reason, various methods have been conventionally adopted to improve the resin impregnation of the resin varnish into the base material. In addition, the rewound base material is pressurized or the base material is pressurized in a resin varnish tank, but in either case, pressure can only be applied instantaneously, and the effect is poor. Therefore, air bubbles and unimpregnated areas remained in the prepreg produced in this manner, and the laminate obtained from this prepreg had poor moldability and poor heat resistance.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to improve the resin impregnating properties of the base material and to produce a laminate with excellent moldability and heat resistance. [Disclosure of 11th Akira] The method for manufacturing a laminate of the present invention includes returning the base material 2 wound up on the winding roll 1 by 88 degrees, immersing it in a resin cloth bath, impregnating the base material 2 with a resin varnish, and then drying it. A method for producing a laminate in which a plurality of prepregs are formed by laminating and molding a plurality of prepregs, characterized in that a base material 2 that has been wound up on a winding roll 1 is pre-pressurized by a pressure roll 3. With this configuration, the above object is achieved. The base material 1 employed in the present invention includes lft cloth,
Examples include paper, woven cloth made of organic fibers or inorganic fibers. This base material 2 is transported to the manufacturing fin in a state of being wound up on a winding roll 1, and the base material 2 in this state of being wound up is
As shown in FIG. 1, the material is pressed by a pressure roll 3, which is a pinch roll pressed by a Schilling-4. This preliminary pressurization destroys the coating film on the surface of the base material. 〃In the case of lath cloth base material, the surface coating film due to the coupling agent will be destroyed, but the pre-pressure is 1 kg/a.
s” or more, preferably 3 kg/cm2 or more, and A*
9. If the pressing force is too large, it tends to deteriorate the plate thickness accuracy, so the upper limit is about 100 kg/am''. Since the base material 2 is pressurized in the rolled up state in this way, as shown in Figure 2. As the base material 2 is unwound, it is pressurized many times (for example, about 15 times at a pressure of 3 kg/am), which causes the destructive effect of the surface-physical agent film such as the coupling agent. becomes large. This base material 2 is rewound and immersed in a resin cloth tank.
The prepreg may be impregnated with resin and dried to form a prepreg. After unwinding, pressure may be applied again, or pressure may be applied within a resin cloth tank. A plurality of prepregs formed in this way are stacked, a metal cylinder is stacked on one or both sides of the prepregs, and a plurality of sets are arranged between hot platens, and they are integrated by heating and pressure forming to form a laminate. is manufactured. In this case, since the base material has excellent resin impregnation properties, the number of bubbles and unimpregnated areas contained in the prepreg is small, and therefore the molding pressure is 10 to 3.
The pressure is as low as 0 kg/cm, and it has excellent formability and improves board thickness accuracy and dimensional stability. Printed wiring boards can be manufactured from this laminate using conventional methods, such as subtractive methods. For example, printed wiring boards are produced through processes such as hole punching, activation treatment, electroless copper plating, screen printing, electrolytic copper plating, electrolytic solder plating (etching left), plating left peeling, etching, heat treatment, and solder resist printing. Next, a detailed explanation of the present invention will be given. (Example 1) As a base material - 0.18 m'm, weight 200 g/m"
We used a lath cloth base material whose surface was treated with an epoxy silane coupling agent. On the other hand, a resin cloth was prepared by blending 2 parts by weight of oxiandiamide and 0.2 parts by weight of imidazole with 100 parts by weight of Brized epoxy resin. The base material is transported in a state wound on a winding roll, pressurized at 5 kg/as'' by pinch cooling, and continuously unwound and immersed in a resin cloth tank, and then dried in a dryer. A so-called B-stage Lennon cloth was formed (resin content: 40% by weight). The number of air bubbles and resin-unimpregnated areas per square inch in this Lennon cloth was observed. The results are shown in Table 1. Stack 4 sheets of resin cloth, and 1 sheet on the top and bottom N sides.
A body tube of 1.5 oz. was arranged, sandwiched between stainless steel plates, and then molded in multiple stages to create an interlocking structure. The molding conditions were 170°C, 90 minutes, and 20 kg/a-2. The copper-clad laminate thus produced was observed for the presence or absence of fading in its appearance, and its heat resistance, warpage, and thickness accuracy were measured. The results are shown in Table 2. (Example 2) Except that the pressing force of the pinch roll was 0.7 kg/c■2! 1E Example A resin cloth was formed using Color Application 1, and a copper-clad laminate was also manufactured, and the same measurements as in Example 1 were carried out. The results are shown in Tables 1 and 2. (Example 3) Resin cloth was formed and a copper-clad laminate was manufactured in the same manner as in Example 1, except that the pinch cool pressure was set to 15,000, and the same measurements as in Example 1 were performed. The results are shown in Table mi and Table 2. (Comparative Example) A Lennon cloth was formed and a copper-clad laminate was manufactured in the same manner as in Example 1, except that preliminary pressure using pinch rolls was not applied, and the same measurements as in Example 1 were performed. The results are shown in Tables 1 and 2. 1 nch” Example 1600 of Lujin cloth air bubbles Fading Heat resistance Warpage Plate thickness accuracy mm Export Example 1 None 50K 1.5 0.08550U
T 2 Yes (small) 3.50K 1,5 0.070UT 3 No 50K 3 0.0755 OU
T Comparative example Yes 2.50K 2 0.09
OUT Measuring method> Fading: Visually determined after etching. Heat resistance: After etching, a test piece of 50u*
It was dipped in solder at 60° C. for 20 seconds and judged based on the presence or absence of swelling. It was set as 0 when there was no engraving in any of the five test pieces, and it was set as 0 tlT when even one test piece had blisters. Warpage: After etching the entire surface, the film was heated at 170° C. under suspension in IHr, and the maximum value of the amount of lifting of the end portion on a surface plate was defined as the amount of warpage. The test piece is 500a+mX300
It is m-. Plate thickness accuracy: by micrometer. From the results in Table 2, it can be seen that the comparative examples have poor heat resistance. This is thought to be because internal stress remains when resin cloth with poor resin impregnation properties is molded. On the other hand, in the example, if the pressing force of the pinch roll is small as in Example 2, the number of bubbles and unimpregnated parts of the Lennon cloth will be relatively large (and scratches will occur), and the heat resistance will be significantly improved. Furthermore, as in Example 3 (the warpage tends to increase as the pressure of the pinch roll increases), the Example had better transparency than the Comparative Example. [Effects] The present invention involves unwinding a base material wound onto a winding reel, immersing it in a resin varnish bath, impregnating the base material with resin varnish and drying it to form a prepreg, and laminating a plurality of sheets of this prepreg. In the manufacturing method for forming laminates, the base material that has been wound up on a take-up roll is pre-pressurized using a pressure roll. As a result, the film of the surface treatment agent such as the coupling agent is definitely destroyed, and as a result, the resin impregnation of the base material is improved, and the resulting prepreg has fewer air bubbles and unimpregnated areas. This results in the production of a laminate with excellent formability and heat resistance.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the present invention, and FIG. 2 is an enlarged view showing the same effect, in which 1 is a take-up roll, 2
3 is a base material, and 3 is a pressure roll. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 @ Figure 2... Winding roll... Pressure roll

Claims (1)

[Claims] (1) A laminate board in which a base material wound on a take-up roll is rewound and dipped in a resin varnish bath to impregnate the base material with resin varnish and then dried to form a prepreg, and a plurality of prepregs are laminated and molded. 1. A method for producing a laminate, characterized in that the base material wound around a take-up roll is pre-pressurized using a pressure roll.