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    • 4. 发明授权
    • Method of molding a cart using molding processes
    • 使用成型工艺成型车的方法
    • US06589458B2
    • 2003-07-08
    • US09819652
    • 2001-03-29
    • Norman DeCost
    • Norman DeCost
    • B29C4402
    • B29C45/1704B29C44/3446Y10T29/4998
    • A method of molding components of a shopping cart using high or low pressure molding processes. The molding processes eliminate sink marks in plastic components of the shopping cart while providing structural integrity thereto. The processes used to mold the components of the shopping cart can create either or both a center channel in the molded components and/or a plurality of voids within the molded components. If hollow channels are formed in the molded components then the plurality of voids will be formed in the walls of such molded component if both processes are used together. The processes used to form the molded components are either (i) a gas assist process which provides a laminar stream of blowing agent into the stream of molten resin after the molten resin is forced into a partially filled mold or (ii) a structural foam molding process which provides a blowing agent blended into the molten resin prior to the molten resin being forced into the mold.
    • 使用高压或低压成型工艺成型购物车部件的方法。 成型工艺消除购物车的塑料部件中的凹痕,同时提供结构完整性。 用于模制购物车部件的过程可以在模制部件中产生中心通道和/或模制部件内的多个空隙中的一个或两个。 如果在模制部件中形成中空通道,则如果两个方法一起使用,则在这种模制部件的壁中将形成多个空隙。 用于形成模制部件的方法是(i)在熔融树脂被迫进入部分填充的模具中之后提供发泡剂层流的熔融树脂的气体辅助方法,或(ii)结构泡沫模塑 在熔融树脂被迫进入模具之前提供混合到熔融树脂中的发泡剂的方法。