Reduced die lip buildup extrusion of polymer compositions
    2.
    发明授权
    Reduced die lip buildup extrusion of polymer compositions 失效
    降低聚合物组合物的模唇加压挤压

    公开(公告)号:US06245271B1

    公开(公告)日:2001-06-12

    申请号:US09447015

    申请日:1999-11-22

    CPC classification number: B29C47/065 B29C47/0021 B29C47/0883 B29C47/145

    Abstract: Process for die extrusion of melted polymers that reduces die lip buildup and its deleterious effects. Direct extrusion of mixed polymer pellets and filler concentrate pellets in one embodiment avoids a precompounding step and reduces the tendency of polymer and filler particles to adhere to the exit portion of the die. In other embodiments a reduced die lip radius and lower melt processing temperatures further enhance the benefits obtained. For co-extruded muitilayer film embodiments elimination of fillers and antiblock additives in skin layers add to the levels of die lip buildup reduction obtained. Hours of continuous operation without excessive die lip buildup in one arrangement have been increased from a level of 4 to 6 hours, for example, to in excess of 20 hours. Reduced product defect levels have also been attained.

    Abstract translation: 熔融聚合物挤出模具的方法可以减少乳液的积聚及其有害的影响。 在一个实施方案中,混合聚合物颗粒和填料浓缩物颗粒的直接挤出避免了预混合步骤并且降低了聚合物和填料颗粒粘附到模头的出口部分的趋势。 在其它实施例中,减小的模唇半径和较低的熔融加工温度进一步增强了获得的好处。 对于共挤出的三层膜,实施方案消除皮肤层中的填料和抗粘附添加剂增加获得的模唇增厚降低的水平。 在一个布置中没有过多的模唇积累的连续操作的小时已经从4小时增加到6小时,例如超过20小时。 降低产品缺陷水平也已经达到。

    Methods of making stretched filled microporous films
    3.
    发明授权
    Methods of making stretched filled microporous films 失效
    拉伸填充微孔薄膜的制备方法

    公开(公告)号:US06179939B2

    公开(公告)日:2001-01-30

    申请号:US08854460

    申请日:1997-05-12

    CPC classification number: B29C55/065 B29K2105/04 B29K2105/16

    Abstract: Breathable barriers, comprising a thermoplastic polymer and at least 30% by weight filler, are stretched in one direction in multiple discrete steps wherein the strain rate of each discrete stretching step is less than about 100,000%/minute and wherein the line speed of the last stretching step is in excess of 500 feet per minute. The resulting films may be stretched, as a result of the cumulative discrete stretching operations, from about 2 to 7 times its original length in order to create a breathable barrier having a WVTR in excess of 800 g/m2/day and a hydrohead of at least 60 cm.

    Abstract translation: 包含热塑性聚合物和至少30重量%填料的透气屏障在多个离散步骤中沿一个方向拉伸,其中每个离散拉伸步骤的应变速率小于约100,000%/分钟,并且其中最后的线速度 拉伸步骤超过每分钟500英尺。 由于累积的离散拉伸操作,所得到的膜可以拉伸其原始长度的约2至7倍,以便产生具有超过800g / m 2 /天的WVTR的透气屏障和 至少60厘米。

    Method of forming thin, embossed, textured barrier films
    4.
    发明授权
    Method of forming thin, embossed, textured barrier films 失效
    形成薄的,压花的,有纹理的屏障膜的方法

    公开(公告)号:US06264872B1

    公开(公告)日:2001-07-24

    申请号:US09205904

    申请日:1998-12-04

    Abstract: Embossed textured films are made by feeding a thin thermoplastic polymer barrier film through the nip of a bonding roll assembly having a patterned roll and an anvil roll rotating at different circumferential speeds which differ by 5% to 200%. The bond pattern is imparted to the film as well as additional texture due to the differential speeds of the rollers thereby creating an embossed, textured barrier film having improved hand and a hydrohead in excess of about 30 mbar.

    Abstract translation: 通过将薄的热塑性聚合物阻挡膜通过具有不同圆周速度旋转的图案化辊和砧辊的粘合辊组件的辊隙供给而制成压纹织化膜,其差异在5%至200%。 由于辊的差速而使粘合图案赋予膜以及附加的质地,从而产生具有改进的手和具有超过约30毫巴的水压头的压花纹理的屏障膜。

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