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    • 50. 发明授权
    • Co-extrusion process for making decorative moldings having simulated wood appearance and decorative molding made thereby
    • 用于制造具有模拟木材外观的装饰模制品和由此制成的装饰模制品的共挤出工艺
    • US08323545B2
    • 2012-12-04
    • US12724029
    • 2010-03-15
    • Angelo SudanoBenoit Meloche
    • Angelo SudanoBenoit Meloche
    • B29C47/00
    • B29C47/025B29C47/0028B29C47/003B29C47/046B29C47/064B29C2947/9259B29C2947/92885B29K2027/06B44F9/02Y10T428/24438
    • A co-extrusion process for making decorative moldings having a simulated wood appearance and a given profile includes mixing a base material and color particles to form a mixture, the base material having a rigid polymer and the color particles having a different color from the base material and a higher melt temperature than the base material. The mixture is heated and displaced using a feed screw such that the color particles move helically along the trajectory of the feed screw while avoiding backflow and melting to create corresponding helical vein segments within the base material. The mixture is forced through a tubular channel while controlling heat and shear conditions such that the helical vein segments remain substantially intact. The mixture is fed into a die having at least a first tubular inlet communicating with the tubular channel, a first outlet having a planar shape corresponding to the given profile, and a first cavity between the inlet and the outlet, the cavity having a form to flatten and widen the mixture to produce a planar surface coating at the outlet wherein the helical vein segments are transposed into two-dimensional nested arches simulating wood appearance. The surface coating is extruded onto a first side of a core having cellular polymer material, producing the decorative mouldings.
    • 用于制造具有模拟木材外观和给定轮廓的装饰模制品的共挤出方法包括混合基材和着色颗粒以形成混合物,所述基材具有刚性聚合物,并且所述着色颗粒具有与所述基材不同的颜色 并且熔融温度比基材高。 使用进料螺杆将混合物加热和移位,使得着色颗粒沿着进料螺杆的轨迹螺旋运动,同时避免回流和熔化,以在基材内形成相应的螺旋状静脉段。 混合物被迫通过管状通道,同时控制热和剪切条件,使得螺旋静脉段保持基本上完整。 将混合物进料到具有至少与管状通道连通的第一管状入口的模具中,具有对应于给定轮廓的平面形状的第一出口和入口与出口之间的第一空腔, 使混合物变平并加宽以在出口处产生平面表面涂层,其中螺旋形静脉段被转置成模拟木材外观的二维嵌套拱。 将表面涂层挤出到具有多孔聚合物材料的芯的第一侧上,产生装饰模制品。