Method for making flexible sandwich board
A manufacturing method and laminated board technology, applied in chemical instruments and methods, lamination, layered products, etc., can solve problems such as difficulties and achieve high utilization value
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Embodiment 1
[0035] Polyamic acid resin solution A (2500 cp / 24° C.) and polyamic acid resin solution B (28000 cp / 24° C.) dissolved in N,N-dimethylacetamide were prepared as resin solutions. A strip-shaped electrolytic copper foil having a width of 540 mm, a length of 540 m, and a thickness of 12 μm was prepared as the metal foil. When conveying this copper foil continuously, the resin solution was uniformly apply|coated in 3 layers so that it may follow A, B, A on the copper foil. The coated copper foil is dried in a floating heating furnace at 90 to 130°C for 6 minutes, and then heated and hardened at 130 to 360°C for 20 minutes to obtain a polyamide coating on the copper foil. Copper-clad laminate with imide film layer. Wherein, the thickness of the polyimide film layer was measured and found to be 40 μm.
[0036] On the laminate thus obtained, wavy irregularities (wave-shaped wrinkles) with a pitch of 10 to 20 mm and a height of about 1 to 2 mm are generated in the flow direction. Ne...
Embodiment 2
[0038] Apply the laminate made as in Example 1 on the curved surface of a metal flattening roller with a radius of 300mm in an environment of 220°C, with the copper foil surface as the inner side and in the direction of the flow of the laminate. Under the state of tension of 220N / m, make the above-mentioned roller surface and the copper foil surface in close contact within 1 / 2 of the circumference of the roller, and while the flattening roller is rotating, the laminated board is rotated at a speed of 5m / min As a result of conveying, an outwardly flat flexible copper-clad laminate with corrected wrinkles was obtained. Then, the flexible copper-clad laminate is passed over rollers for conveyance only, and is wound up. The obtained flexible copper-clad laminate was good in appearance without waviness.
Embodiment 3
[0040] Apply the laminate made as in Example 1 on the curved surface of a metal flattening roller with a radius of 200mm in an environment of 200°C, with the copper foil surface as the inner side and in the direction of the flow of the laminate. Under the state of tension of 100N / m, make the above-mentioned roller surface and the copper foil surface in close contact within 1 / 2 of the circumference of the roller, and while the flattening roller is rotating, the laminated board is rotated at a speed of 5m / min As a result of conveying, an outwardly flat flexible copper-clad laminate with corrected wrinkles was obtained. Then, the flexible copper-clad laminate is passed over rollers for conveyance only, and is wound up. The obtained flexible copper-clad laminate was good in appearance without waviness.
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