JPH02235630A - Preparation of laminated sheet - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet wherein warpage is reduced and a long material is not broken by a method wherein the required material in a laminate wherein a metal foil is arranged to the upper surface and/or lower surface of a long strip like resin impregnated base material after squeeze-lamination is once separated to measure the tension thereof and, after said material is again laminated, the laminate is continuously transferred to be cured and cut into a required dimension. CONSTITUTION:In the curing of a long strip like laminate 5 having a metal foil arranged and laminated to the upper surface and/or lower surface thereof after squeeze- lamination, curing temp. and a curing time can be selected according to the kind of a resin but the pressure at the time of curing is pref. non-pressure-40 kg/cm<2> or less and can be selected to the kind of a resin to be used. At the time of the measurement of tension after the impregnation with the resin, the required material of the metal foil or resin impregnated base material in the laminated long strip like laminate is once separated. Then, the tension of the material is measured by a tension measuring roll 7 and again laminated. Thereafter, the laminate is continuously transferred through a curing oven 10 by pinch rolls or drawing-out rolls 9 to be cured and cut into a required dimension by a cutter 11 to obtain a laminated sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a laminate used in electronic equipment, electrical equipment, computers, communication equipment, etc.

[Conventional technology]

Conventionally, laminates used for electrical equipment, etc. are made of camphor laminates made of a resin-impregnated base material and metal foil, and are pressed for a long time (
1 to 2 hours) Since it is obtained by heating and pressure molding, there are bubbles in the resin-impregnated base material, and even if they are false, they will be discharged from the laminate after long heat and pressure molding, so the laminate is a cured product. A dense laminate with no residual air bubbles was obtained. However, when manufacturing laminates continuously, the curing process takes a long time, and the tensile stress applied to the long material becomes large, which remains as internal stress in the laminate and has a negative effect on warping. There was also the problem that the long material would break in the middle. For this reason, attempts have been made to measure the tensile strength of long materials, but in each case the measurements were taken before the long material was impregnated with resin, and the tensile strength of the long material after it had become a resin-impregnated material was measured.
! It did not measure 1 inch and was not an accurate solution to the problem.

[Problems that the invention attempts to solve]

As described in the prior art section, when laminates are continuously split, there are problems in that the laminates are warped to a large degree and long materials tend to break during the splitting process. The present invention has been made in view of the above-mentioned problems in the conventional technology, and its purpose is to provide a method for manufacturing a laminated board with small warpage and without breaking long materials during the manufacturing process. It is in.

[Means for solving problems]

In the present invention, after squeezing and laminating a required number of long strip-like resin-impregnated base materials, the required materials in the long strip-like laminate are separated once and laminated by disposing metal foil on the upper and/or lower surfaces thereof. The manufacturing method for laminates is characterized by measuring the tensimeter of the material, laminating it again, curing it while continuously transferring it, and then cutting it to the required size. Because we can know the tensile techniques, we are able to avoid applying excessive tensile stress to the long materials, thereby reducing the warpage of the laminate and eliminating breakage of the long materials. The present invention will be explained in detail below.

Long strip-shaped substrates used in the present invention include glass-based substrates such as glass cloth, glass fibers, glass non-woven fabrics, and paper,
Synthetic fiber cloth, synthetic fiber nonwoven fabric, asbestos barber, cotton cloth, etc. are used, but it is preferable to use thick B glass cloth, glass paper, glass nonwoven fabric, etc., which have thickness adjustment effects. Examples of the resin include unsaturated polyester resins, diallyl phthalate resins, vinyl ester resins, epoxy acrylate resins, epoxy resins, phenol resins, melamine resins, etc. alone, in mixtures, and modified products. In addition, the resin may be impregnated with only the same resin, but the primary impregnation may be a low-viscosity resin and the secondary impregnation may be impregnated with a higher viscosity resin than the primary resin. Of course, a curing agent, a crosslinking agent, a polymerization initiator, a heptanomer diluent, etc. may be added to the resin, and if necessary, Additives such as inorganic powder fillers and short fiber fillers can also be added. The above-mentioned resin may be used as it is, but it is preferable to use it after degassing it under reduced pressure, since this reduces the generation of air bubbles in the resin-containing substrate. As the metal foil, single, alloy, or composite foils of copper, aluminum, iron, nickel, zinc, etc. are used, and if necessary, an adhesive layer can be provided on one side of the metal foil to further improve adhesiveness. . When using a squeeze roll, it is possible to supply the resin used for the resin-impregnated base material between the long strip-shaped resin-impregnated base material and the squeeze roll to generate a resin pool while squeezing and laminating the resin-impregnated base material. This is preferable in order to prevent bubble generation. The resin to be supplied is not limited to the resin used for the resin-containing base material, but it is preferable to use the same resin.Means for supplying b0 include coating, casting, spraying, transfer, impregnation, etc. The advantage of optional force S casting is that it does not incorporate air bubbles. The resin supply is not limited to either one side or both sides. Squeeze rolls are made of metal or rubber! J1: A synthetic resin or metal roll whose surface is lined with rubber or synthetic resin. But it's often optional. When laminating a resin-impregnated base material and a metal foil, it is important to create a resin pool warp between the resin-impregnated base material and the metal foil while causing resin retention warpage due to the resin supply, similar to that in squeeze lamination. This is preferable in order to prevent bubble generation. The laminating roll is not particularly limited, and a normal laminating roll can be used as is.

The curing temperature and curing time of the long strip-shaped laminate can be selected depending on the type of lubricant, but the curing ranges from no pressure to 400 m
Kg/cd or less is preferable, and can be selected depending on the type of resin used. The tensile strength measurement after resin impregnation is carried out by separating the required materials of the metal foil or resin-containing base material in the laminated long strip laminate, and measuring the tensile strength of the material using a test roller or the like. After measuring the thickness, the laminated sheets are laminated again, and then cured while being continuously moved through a curing furnace using pinch rolls, a drawer tool, etc., and then cut into required dimensions to obtain a laminate. Note that the laminate after cutting may be subjected to after-kinearing, if necessary, to improve dimensional stability.

An embodiment of the present invention will be described below based on the illustrated embodiment.

Embodiment FIG. 1 is a simplified process diagram showing an embodiment of the method for producing a laminate according to the present invention.

As shown in FIG. 1, the width IQ is 50ff, the thickness is Q. 2
Four sheets of the long strip-shaped resin-impregnated base material 1, in which a long glass cloth of jf'1 was impregnated with a benzoyl peroxide-containing unsaturated polyester resin degassed under reduced pressure, were passed through a squeeze roll 2 and squeezed to a resin ID of 50% by weight. After lamination, a long strip-shaped laminate 5 with a width of 1050 m and a thickness of 0.0351111 was placed on the top and bottom surfaces and laminated with a laminating roll 4. The base materials are separated one after another by the roll 6, the tensile strength B is measured by the tensilon measuring roll 7, and the density of each material is adjusted to 25 kg per 1 m in the width direction, and then the material is separated again by the small laminating roll 8.
Laminate and integrate with drawer roll 9 to 150
After heating and curing under no pressure while applying KQ tension a and moving continuously in the curing furnace IO, 1000 X io
A double-sided copper-clad laminate sheet with a thickness of 1 fi was obtained by cutting each oo w with a carnotter U.

Comparative Example The same process as in Example was carried out, except that each material in the long strip-shaped laminate was subjected to a tension of 150 knots at the exit hole without measuring the tension individually.
A double-sided copper-clad laminate of I was obtained.

The performance of the laminates of Examples and Comparative Examples is shown in Table 1.

〔Effect of the invention〕

The present invention is constructed as described above. Structures recited in the claims e. The method for manufacturing a laminate having this method has the advantage that there is no warping of the laminate and no breakage of the elongated material.

[Brief explanation of the drawing]

FIG. 1 is a simplified process diagram showing an embodiment of the method for manufacturing a laminate according to the present invention. 1 is a long strip-shaped resin-impregnated base material, 2 is a squeeze roll, 3 is a long copper foil, 4 is a laminate roll, 5 is a long strip-shaped laminate, 6 is a separation roll, 7 is a tension date measuring roll, 9 is a 10 is a curing furnace, 11 is a cutter, and 10 is a laminate plate.

Claims (1)

[Claims] (1) After squeezing and laminating the required number of long strip-shaped resin-impregnated base materials, the required material in the long strip-shaped laminate is separated once by arranging metal foil on the upper and/or lower surfaces of the laminated material. A method for manufacturing a laminate, which comprises: measuring tension, laminating again, curing while continuously transferring, and cutting into required dimensions.