公开(公告)号：US4855018A

公开(公告)日：1989-08-08

申请号：US80317

申请日：1987-07-31

申请人： Elizabeth C. Leonard ,  Lewis Erwin

发明人： Elizabeth C. Leonard ,  Lewis Erwin

IPC分类号： C08J7/12 ,  C09K13/00

CPC分类号： C08J7/12 ,  C09K13/00 ,  C08J2327/12

摘要： A process for etching polytetrafluoroethylene (PTFE) is disclosed herein which comprises defluorinating the surface layer of PTFE. The process includes exposing a sample of PTFE to the vapors of an alkali metal such that a layer of the fluoride of the alkali metal is formed on the surface of the PTFE sample and removing the fluoride of the alkali metal from the surface of the PTFE sample.

摘要翻译： 本文公开了一种蚀刻聚四氟乙烯（PTFE）的方法，其包括使PTFE的表面层脱氟。 该方法包括将PTFE样品暴露于碱金属的蒸气中，使得在PTFE样品的表面上形成碱金属的氟化物层，并从PTFE样品的表面除去碱金属的氟化物 。

公开(公告)号：US4509360A

公开(公告)日：1985-04-09

申请号：US508217

申请日：1983-06-24

申请人： Lewis Erwin ,  Jeffrey L. Dohner

发明人： Lewis Erwin ,  Jeffrey L. Dohner

IPC分类号： G01N29/032 ,  G01N29/22 ,  G01N29/00

CPC分类号： G01N29/032 ,  G01N29/221 ,  G01N29/228 ,  G01N2291/02416 ,  G01N2291/0421 ,  G01N2291/0422

摘要： An apparatus and method for measuring particle agglomeration or dispersion in fluid mixtures, such as polymer melts, resides in a piezoelectric transducer, a spherical fused quartz lens, and a fluid housing. A repetitive, broadband, ultrasonic wave is produced by the transducer and is sent into the lens, which also serves to isolate the transducer from the mixture. The ultrasonic wave meets a spherical dimple at the end of the lens which focuses a portion of it into a diffraction limited spot or "interrogation zone". Since the intensity of the wave is large in the interrogation zone, small changes in the impedance of the fluid in this zone, caused by passing agglomerates, will cause large fluctuations in the intensity of the back scattered wave, which is monitored by the transducer between pulses and displayed by associated electronic elements.

摘要翻译： 用于测量流体混合物（例如聚合物熔体）中的颗粒聚集或分散的装置和方法驻留在压电换能器，球形熔融石英透镜和流体壳体中。 重复的，宽带的超声波由换能器产生并被送入透镜，其也用于将换能器与混合物隔离。 超声波在透镜的端部处遇到一个球形凹坑，将其一部分聚焦成衍射限制光斑或“询问区”。 由于询问区的波强大，该区域的流体阻抗的小变化是由聚集体引起的，会引起背散射波强度的大幅波动，这是由传感器监测的 脉冲并由相关联的电子元件显示。

公开(公告)号：US5114907A

公开(公告)日：1992-05-19

申请号：US670236

申请日：1991-03-15

申请人： Lewis Erwin ,  Keith Crandell ,  Justin Whitney

发明人： Lewis Erwin ,  Keith Crandell ,  Justin Whitney

IPC分类号： G01F23/24

CPC分类号： G01F23/246 ,  Y10S505/842 ,  Y10S505/847

摘要： A cryogenic level sensor assembly. A sensor assembly includes a continuous length of high temperature ceramic superconductor material, an exterior housing for holding the length of ceramic superconductor material, a support material disposed between the ceramic superconductor material and the exterior housing, and a resilient retention material disposed opposite the ceramic superconductor material for holding the superconductor material while allowing expansion and contraction thereof during thermal cycling.

摘要翻译： 低温液位传感器组件。 传感器组件包括连续长度的高温陶瓷超导体材料，用于保持陶瓷超导体材料的长度的外部壳体，设置在陶瓷超导体材料和外部壳体之间的支撑材料和与陶瓷超导体相对设置的弹性保持材料 用于保持超导体材料同时允许其在热循环期间的膨胀和收缩的材料。

公开(公告)号：US4513116A

公开(公告)日：1985-04-23

申请号：US481366

申请日：1983-04-01

申请人： Ronald C. Kowalski ,  William M. Davis ,  Neil F. Newman ,  Lewis Erwin

发明人： Ronald C. Kowalski ,  William M. Davis ,  Neil F. Newman ,  Lewis Erwin

IPC分类号： C08F8/00 ,  C08C19/12 ,  C08F8/20 ,  C08F8/22

CPC分类号： C08C19/12 ,  C08F8/20

摘要： Continuous halogenation of polymers is achieved by contacting polymer and halogenating agent in a continuous flow device in which the reactants are present as either co-continuous phases or wherein the halogenating agent is present as a continuous phase and the polymer is present as a discontinuous phase, the polymer is subjected to deformation during reaction and in which means are provided for disengaging reaction by-products and unreacted halogenating agent from the reaction mixture. In a preferred embodiment the polymer passes through three extruder-reactor zones under controlled conditions to achieve halogenation: feed, reaction (preferably vented), neutralization, and optionally a wash and exit zone. A continuous halogenating agent phase is achieved during reaction by avoiding complete filling of the reaction zone with polymer. Various halogenated polymers are produced, for example, halogenated linear low density polyethylene and halogenated butyl rubber.

摘要翻译： 通过使聚合物和卤化剂在连续流动装置中接触来实现聚合物的连续卤化，其中反应物以共连续相存在，或者其中卤化剂作为连续相存在，并且聚合物以不连续相存在， 聚合物在反应过程中变形，并且提供了用于使反应副产物和未反应的卤化剂从反应混合物中分离的装置。 在优选的实施方案中，聚合物在受控条件下通过三个挤出机 - 反应器区域，以实现卤化：进料，反应（优选排气），中和，任选的洗涤和出口区。 在反应期间通过避免用聚合物完全填充反应区而实现连续的卤化剂相。 制备各种卤化聚合物，例如卤化线性低密度聚乙烯和卤化丁基橡胶。

公开(公告)号：US4758398A

公开(公告)日：1988-07-19

申请号：US916307

申请日：1986-10-07

申请人： John J. Sparapany ,  Lewis Erwin ,  Kevin J. Prey

发明人： John J. Sparapany ,  Lewis Erwin ,  Kevin J. Prey

IPC分类号： B29B9/06 ,  B29B11/10 ,  B29B13/04 ,  B29C47/00 ,  B29C47/88 ,  B29C47/92 ,  B29C69/00 ,  B29K101/10 ,  B29C47/12

CPC分类号： B29C47/0004 ,  B29C47/0016 ,  B29C47/0066 ,  B29C47/8815 ,  B29C47/92 ,  B29C2793/0027 ,  B29C2947/92123 ,  B29C2947/92428 ,  B29C2947/9258 ,  B29C2947/92619 ,  B29C2947/92923 ,  B29C2947/92933 ,  B29K2101/10 ,  B29K2301/10 ,  Y10S264/59 ,  Y10T83/0304

摘要： A method of preparing a plurality of thermoset resin preforms by extruding a rod, cooling the rod to retain its dimensional uniformity and to reduce further curing of the resin, forming a plurality of grooves in the rod, and fracturing the rod at the grooves to yield the preforms.

摘要翻译： 通过挤出杆来制备多个热固性树脂预成型件的方法，冷却棒以保持其尺寸均匀性并减少树脂的进一步固化，在棒中形成多个槽，并在棒上压裂棒以产生 预成型件。

公开(公告)号：US4674885A

公开(公告)日：1987-06-23

申请号：US688755

申请日：1985-01-04

申请人： Lewis Erwin ,  John Arimond

发明人： Lewis Erwin ,  John Arimond

IPC分类号： B01F3/08 ,  B28C7/04

CPC分类号： B01F3/0803

摘要： Liquids of different viscosity are mixed together more rapidly and with less energy consumption by elongating drops of the more-viscous liquid prior to mixing them into the less-viscous surrounding liquid. The more-viscous drops are elongated past a critical aspect ratio that is a function of the ratio of the viscosities of the two liquids and of the relative volume fractions they occupy. The rate at which the more-viscous drops mix into the surrounding liquid is dependent on the amount of shear strain required to stretch the drops to their critical aspect ratio, and thus, if the drops begin the mixing process already elongated, the rate of mixing is greater. In polymer blending operations, wherein a tumbled mixture of polymer pellets are melted and blended, the more-viscous pellets are elongated in the pelletizing operation. The mixing technique can be applied whenever the more-viscous drops are distributed discontinuously through a mixture, i.e., whenever they do not form a continously connected matrix. This occurs most often when the more-viscous liquid is in the minority, but may occur when it is in the majority.

摘要翻译： 将不同粘度的液体在将它们混合到较粘稠的周围液体中之前，通过延长较粘稠液体的液滴而更快速地并且具有较少的能量消耗混合在一起。 较粘稠的液滴通过临界长宽比伸长，其是两种液体的粘度与其占据的相对体积分数之比的函数。 更粘稠的液滴混合到周围液体中的速率取决于将液滴拉伸至其临界长宽比所需的剪切应变的量，因此，如果液滴开始已经延长的混合过程，混合速率 更伟大。 在聚合物共混操作中，其中聚合物颗粒的翻滚混合物熔融并混合，在造粒操作中更粘稠的颗粒是细长的。 每当粘稠的液滴通过混合物不连续地分布时，即每当它们不形成连续的基质时，混合技术就可以应用。 当更粘稠的液体在少数情况下，这种情况最常发生，但是当大多数情况下可能发生。