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    • 4. 发明授权
    • Product containing high density skins
    • 含高密度皮肤的产品
    • US4283450A
    • 1981-08-11
    • US95628
    • 1978-11-19
    • Allan J. LuckJohn T. ClarkeMichael R. Hoffman
    • Allan J. LuckJohn T. ClarkeMichael R. Hoffman
    • B27N7/00C08L97/02B32B5/14B32B23/04
    • C08L97/02B27N7/00B29K2311/14Y10T428/24603Y10T428/24992Y10T428/31949Y10T428/31971Y10T428/31982
    • A fiberboard is manufactured having relatively high density skins on a relatively low density core by including urea in at least the surface fibers of a consolidated mat, having a density of less than 35 pounds per cubic foot, and then hot-pressing the consolidated mat at a temperature of at least 525.degree. F. to form a board having high density surface skins. In accordance with another embodiment of the present invention, urea is used to form a skin on higher density mats having a density of 35 pounds/ft..sup.3 or greater. The skin formed on the higher density mats has strength and density properties which are not as significantly different from the core material as is the skin formed over the low density core material of the first embodiment, but the skin on the higher density mats also improves the board strength, stiffness, paint holdout and design fidelity properties.
    • 通过在至少具有小于35磅/立方英尺的密度的固结垫的表面纤维中包含尿素,然后在相对低密度的芯上具有相对高密度的表皮,然后热压固结垫 温度至少为525°F,以形成具有高密度表面皮的板。 根据本发明的另一个实施方案,尿素用于在密度为35磅/立方英尺或更大的较高密度的垫子上形成皮肤。 形成在较高密度垫子上的皮肤具有与第一实施例的低密度芯材上形成的皮肤的核心材料没有显着差异的强度和密度性质,但是较高密度垫子上的皮肤也改善了 板强度,刚度,油漆保持力和设计保真度。
    • 5. 发明授权
    • Post-press molding of man-made boards to produce contoured furniture
parts
    • 人造板的后压成型,生产轮廓家具部件
    • US4275027A
    • 1981-06-23
    • US95629
    • 1979-11-19
    • Allan J. LuckJohn T. ClarkeMichael R. Hoffman
    • Allan J. LuckJohn T. ClarkeMichael R. Hoffman
    • B27N7/00C08L97/02B29J5/00
    • B27N7/00C08L97/02B29K2311/14
    • A cellulosic fiber containing board is molded at a temperature of at least 525.degree. F. to provide a relatively high density skin on at least one surface. A fibrous composition, including cellulosic fibers, is consolidated to form a consolidated blank. The consolidated blank is then cut to a shape larger in at least two of its three dimensions than corresponding dimensions of a mold cavity when said mold is in a closed position. Urea is then included in at least a surface layer of fibers of the blank in an amount of at least 5% based on the dry weight of the fibers contacted with urea, and thereafter the cut blank is molded to form a contoured product having a skin on at least one surface thereof. The skin is formed by hot-pressing a consolidated cellulosic fiber-containing board including urea in at least its surface fibers, at a temperature of at least 525.degree. F. The composition of the skin has not been determined but is different than the composition of cellulosic material thereunder. In one embodiment, the consolidated cellulosic fiber-containing board has a density of less than 35 pounds/ft..sup.3 to provide a skin of higher density and substantially better structural properties. In accordance with another embodiment, a consolidated board having a density of at least 35 pounds/ft..sup.3 is provided with a skin which is not as significantly different from the core material as is the skin formed over the low density core material of the first embodiment, but the skin on the higher density mats also improves the board strength, stiffness, paint holdout and design fidelity properties.
    • 在至少525°F的温度下模塑含纤维素纤维的板,以在至少一个表面上提供相对高密度的皮肤。 包含纤维素纤维的纤维组合物被固结以形成固结的坯料。 然后当所述模具处于关闭位置时,将固化的坯料切割成其三维尺寸中至少两个中比模具腔的相应尺寸更大的形状。 尿素至少包含在坯料纤维的至少一层表面层中,其含量相对于与尿素接触的纤维的干重为至少5%,然后将切割的坯料模制成具有皮肤的成型产品 在其至少一个表面上。 皮肤通过在至少525°F的温度下热压含有至少其表面纤维中的尿素的固结的含纤维素纤维的板形成。皮肤的组成尚未确定,但不同于 纤维素材料。 在一个实施方案中,固结的含纤维素纤维的板具有小于35磅/英尺3的密度,以提供更高密度和更好的结构特性的皮肤。 根据另一个实施方案,具有至少35磅/英尺3的密度的固结板具有与芯材料没有显着不同的皮肤,这与在第一 但是高密度垫子上的皮肤也提高了板的强度,刚度,油漆保持力和设计保真度。