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    • 6. 发明授权
    • Back-to-back transition web and method of making said
    • 背对背过渡网和制作方法
    • US3952124A
    • 1976-04-20
    • US377373
    • 1973-07-09
    • Frederick K. Mesek
    • Frederick K. Mesek
    • D04H1/04D04H1/26D04H1/28D04H1/42D04H1/44D04H1/64D04H1/72D04H1/732B32B5/14B32B5/26B32B5/28B32B31/12
    • D04H1/72B32B5/022B32B5/08B32B5/145B32B5/26B32B7/06D04H1/04D04H1/26D04H1/28D04H1/425D04H1/4374D04H1/4382D04H1/44D04H1/64D04H1/732B32B2260/023B32B2260/046B32B2262/0261B32B2262/0276B32B2262/04B32B2262/062B32B2262/067B32B2262/14B32B2307/54B32B2307/734B32B2555/02Y10T428/24992Y10T442/60
    • A method for producing a multi-layer web, and the web produced thereby, are disclosed. The nonwoven web consists of two half-thickness portions laminated to each other. A first half-thickness portion is characterized by a given overall concentration of long and short fibers and has one face enriched in long fibers above the overall concentration and the other face enriched in short fibers above the overall concentration. The concentrations of long and short fibers decrease substantially uniformly from the enriched faces to form a transition region within the half-thickness portion. The second half-thickness portion is bonded to the short fiber-enriched face of the first half-thickness portion and has an outer face (opposite the bonded face) of substantial structural integrity as compared to the short length fiber-enriched face of the first half-thickness portion. In the preferred embodiment, the second half-thickness portion is similar to the first half-thickness portion and bonded in mirror image relationship thereto.The method produces two half-thickness portions which are bonded together to form a multi-layer web. A first half-thickness portion is produced by feeding long and short fibers at given concentrations to individualizing means. The individualized fibers are deposited on a moving foraminous belt to produce a half-thickness portion enriched with long fibers at one face and short fibers at the other face and having a transition of fiber concentrations between the faces. A second half-thickness portion having at least an outer face with greater structural integrity than the short fiber-enriched face of the first half-thickness portion is produced by air-laying techniques. The second half-thickness portion is bonded with its outer face opposite the pulp-enriched face of the first half-thickness.
    • 公开了一种多层网的制造方法和由此制造的网。 非织造纤维网由彼此层叠的两个半层部分组成。 第一半厚部分的特征在于给定的长纤维和短纤维的总浓度,并且具有富含长纤维的一面以上的总浓度,另一面富含高于总浓度的短纤维。 长纤维和短纤维的浓度从富集面大致均匀地降低,以在半厚度部分内形成过渡区域。 与第一半层部的短纤维富集面相比,第二半部分与第一半层部分的短纤维富集面接合,具有显着结构完整性的外表面(与接合面相对) 半厚度部分。 在优选实施例中,第二半部分与第一半厚部分类似,并与其成镜像关系。