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    • 4. 发明授权
    • Method for forming multi-layer laminates with microstructures
    • 用微结构形成多层层压板的方法
    • US06375776B1
    • 2002-04-23
    • US09489789
    • 2000-01-24
    • Drew J. BuoniAlan R. Kaufman
    • Drew J. BuoniAlan R. Kaufman
    • B32B3120
    • B32B38/06B29D11/00605B32B37/26B32B2037/268B32B2307/418Y10T156/1023Y10T156/1712Y10T156/1741
    • A method of continuously forming a multi-layer laminate of thermoplastic polymeric films wherein one surface thereof has a precision pattern of embossed elements thereon and wherein the thermoplastic polymeric films can be dissimilar. A generally cylindrical seamless metal embossing tool with an outer surface having the reverse of the pattern to be formed on the surface of the sheeting is used. The laminate is formed by continuously feeding onto a heated embossing tool a superimposed first resinous film and a first carrier film wherein the first resinous film is pressed against the embossing tool and is heated above its glass transition temperature thereby becoming embossed with the pattern, while the first carrier film remains at a temperature below its glass transition temperature. The first carrier film is then removed, and a second resinous film and second carrier film are superimposed on the unembossed surface of the first resinous film and are heated such that the two resinous films become bonded together. The resulting laminate is then cooled and is stripped from the embossing tool. If the laminate is to be used for retroreflective sheeting, then, because the second resinous film is applied after the embossing step is complete, a smooth interface can be formed between the two resinous films. This results in a sheeting of exceptional retroreflective capability, even if the first and second resinous films are dissimilar thermoplastic materials.
    • 一种连续形成多层热塑性聚合物薄膜的方法,其中一个表面上具有压花元件的精密图案,其中热塑性聚合物薄膜可以是不相似的。 使用通常为圆柱形的无缝金属压花工具,其外表面具有形成在片材表面上的图案的相反面。 层压体是通过将加热的压花工具连续地送入叠加的第一树脂膜和第一载体膜而形成的,其中第一树脂膜被压靠在压花工具上并被加热到其玻璃化转变温度以上,从而变得被压印,同时 第一载体膜保持在低于其玻璃化转变温度的温度。 然后除去第一载体膜,并且将第二树脂膜和第二载体膜叠加在第一树脂膜的未卷曲的表面上并被加热,使得两个树脂膜结合在一起。 然后将所得层压体冷却并从压花工具剥离。 如果层压板用于逆反射片材,则由于在压花步骤完成之后施加第二树脂膜,所以可以在两个树脂膜之间形成平滑的界面。 即使第一和第二树脂膜是不同的热塑性材料,这导致了特殊的反射能力的片材。