公开(公告)号：US4145375A

公开(公告)日：1979-03-20

申请号：US881347

申请日：1978-02-27

申请人： Louis A. Cutter ,  Robert E. Nunn

发明人： Louis A. Cutter ,  Robert E. Nunn

IPC分类号： C08F212/08 ,  C08F222/08 ,  C08L25/04

CPC分类号： C08F222/08 ,  C08F212/08

摘要： Styrene is copolymerized with maleic anhydride by mixing maleic anhydride with styrene under mass polymerization conditions in a ratio of styrene to maleic anhydride of at least 5:1, continuing to add maleic anhydride throughout a mass polymerization stage until about 25% to about 40% of the styrene monomer is reacted to produce a reaction mass in which the polymerized maleic anhydride is about 1% to about 10% of the total reaction mass. The polymerization is then completed in a pH-adjusted free-radical initiated suspension stage, which generates homopolymer of styrene. During the suspension stage about 10% to about 20% of the bound maleic anhydride is hydrolyzed. The acid component of the bound maleic acid may be converted back to the anhydride through the use of a vented extruder.

公开(公告)号：US4816197A

公开(公告)日：1989-03-28

申请号：US180487

申请日：1988-04-12

申请人： Robert E. Nunn

发明人： Robert E. Nunn

IPC分类号： B29C45/76

CPC分类号： B29C45/7693 ,  B29C45/76 ,  B29C45/7646

摘要： A method for controlling certain parameters of an injection molding cycle applying PVT optimization wherein the injection pressure and injection velocity of the melt are utilized to calculate an average viscosity for the melt during injection in a qualifying cycle of the machine as well as subsequent production cycles. A ratio of the average viscosity in a given cycle relative to the viscosity in either the qualifying cycle or a preceding cycle is utilized to adjust the holding time and cooling time, thereby achieving PVT optimization. In a second aspect, an injection molding machine is utilized to develop PVT constants for a given material by pressurizing the material in the barrel against the blocked outlet nozzle, measuring the volume during pressurization, and then weighing the pressurized shot after it is purged from the barrel in order to calculate the specific volume of the material. Plotting specific volume against a variety of pressure and temperature values produces a plot of PVT relationships from which the constants can be derived.

摘要翻译： 一种用于控制采用PVT优化的注射成型循环的某些参数的方法，其中使用熔体的注射压力和注射速度来计算在机器的合格循环期间的注射期间熔体的平均粘度以及随后的生产周期。 使用给定循环中的平均粘度相对于合格循环或前一循环中的粘度的比例来调整保持时间和冷却时间，从而实现PVT优化。 在第二方面，一种注射成型机用于通过将筒体内的材料压靠阻塞的出口喷嘴，在加压期间测量体积，然后在将加压的喷枪从 桶，以计算材料的比体积。 根据各种压力和温度值绘制特定体积产生一个PVT关系图，可以从中得出常数。

公开(公告)号：US4850217A

公开(公告)日：1989-07-25

申请号：US258652

申请日：1988-10-17

申请人： Robert E. Nunn

发明人： Robert E. Nunn

IPC分类号： B29C45/76

CPC分类号： B29C45/7693 ,  B29C45/76 ,  B29C45/7646

摘要： An injection molding machine is utilized to develop PVT constants for a given material by pressurizing the material in the barrel against the blocked outlet nozzle, measuring the volume during pressurization, and then weighing the pressurized shot after it is purged from the barrel in order to calculate the specific volume of the material. Plotting specific volume against a variety of pressure and temperature values produces a plot of PVT relationships from which the constants can be derived.

摘要翻译： 使用注射成型机来开发给定材料的PVT常数，通过将筒体内的材料压靠堵塞的出口喷嘴，测量加压时的体积，然后在从筒体清除之后称重加压喷丸，以便计算 材料的比体积。 根据各种压力和温度值绘制特定体积产生一个PVT关系图，可以从中得出常数。

公开(公告)号：US4299792A

公开(公告)日：1981-11-10

申请号：US152170

申请日：1980-05-22

申请人： Robert E. Nunn

发明人： Robert E. Nunn

IPC分类号： B29C45/00 ,  B29C45/60 ,  B29F1/02 ,  B29F1/12

CPC分类号： B29C45/0005 ,  B29C45/60

摘要： A method for the injection molding of plastics material wherein the forward portion of the screw is designed such that mixing and shear of the material is minimized. This is advantageous when processing materials having diverse colorations so as to produce a mottled product, and also for processing glass reinforced materials wherein high shear processing would break the fibers thereby resulting in a lower quality product. Low shear processing of the material in the forward portion of the barrel is accomplished by providing a screw having a fully flighted rear portion, but a forward portion which is flightless so that a generally unobstructed, annular flow passage is formed between the cylindrical outer periphery of the flighted portion and the inner wall of the barrel. In a mottling application of the apparatus, materials of diverse coloration are softened by the flighted rear portion of the screw but not yet fully mixed so that distinct color patterns are present. When the material reaches the unflighted portion, it will be forced forwardly by the forward pressure developed as the screw continues to pump material forwardly, but the only shear imparted thereto is the gentle wiping action produced by the inner wall of the barrel and the outer periphery of the unflighted portion of the screw so that the streaked condition of the material remains intact. In the case of glass reinforced materials, the circumferential wiping action produced by the unflighted section of the screw aids in wet-out.

摘要翻译： 一种用于塑料材料注射成型的方法，其中螺杆的前部被设计成使材料的混合和剪切最小化。 当处理具有不同着色的材料以便产生斑驳的产品时，并且还用于加工玻璃增强材料的加工材料是有利的，其中高剪切加工将破坏纤维，从而导致较低质量的产品。 通过提供具有完全飞行的后部的螺钉来实现筒的前部中的材料的低剪切加工，但是具有无飞行的前部，使得在圆筒形的外圆周之间形成大致无阻碍的环形流动通道 枪管的飞行部分和内壁。 在该设备的斑驳应用中，不同着色的材料被螺丝的后排部分软化，但尚未完全混合，从而存在不同的颜色图案。 当材料到达未被打开的部分时，当螺杆继续向前泵送材料时，由向前压力产生的向前的压力将被强制向前施加，但是施加到其上的唯一剪切是由筒的内壁和外周产生的温和擦拭作用 的螺丝的未打开的部分，使得材料的条纹条件保持完整。 在玻璃增强材料的情况下，由螺丝的未开启部分产生的周向擦拭作用有助于润湿。

公开(公告)号：US4925313A

公开(公告)日：1990-05-15

申请号：US178188

申请日：1988-04-06

申请人： Robert E. Nunn

发明人： Robert E. Nunn

IPC分类号： B29B7/42 ,  B29C47/60

CPC分类号： B29C47/6081 ,  B29B7/429 ,  B29C47/003 ,  B29C47/60

摘要： A plasticating screw having a mixing section comprised of two flow channels separated by barrier flights having axially spaced undercut sections and areas of compression and decompression in each channel. Inhomogeneities in the material being plasticated are distributed in both the forward and back directions by means of pressure driven cross-flows caused when the material encounters a section of a channel having a decreasing depth adjacent an undercut section of the barrier flight.

摘要翻译： 一种塑化螺杆，其具有由两个流动通道组成的混合部分，两个流动通道由具有轴向间隔开的切口部分和每个通道中的压缩和减压区域的阻挡层隔开。 正在塑化的材料中的不均匀性通过当材料遇到具有与屏障飞行的底切部分相邻的深度减小的深度的通道的一部分时引起的压力驱动的交叉流而在前后方向上分布。

公开(公告)号：US4306848A

公开(公告)日：1981-12-22

申请号：US208854

申请日：1980-11-21

申请人： Robert E. Nunn

发明人： Robert E. Nunn

IPC分类号： B29C45/00 ,  B29C45/16 ,  B29C45/52 ,  B29C45/60 ,  B29F1/02 ,  B29F1/12

CPC分类号： B29C45/60 ,  B29C45/0005 ,  B29C45/1634 ,  B29C45/52

摘要： A method and apparatus for the injection molding of plastics material wherein the forward portion of the screw is designed such that mixing and shear of the material is minimized. This is advantageous when processing materials having diverse colorations so as to produce a mottled product, and also for processing glass reinforced materials wherein high shear processing would break the fibers thereby resulting in a lower quality product. Low shear processing of the material in the forward portion of the barrel is accomplished by providing a screw having a fully flighted rear portion, but a forward portion which is flightless so that a generally unobstructed, annular flow passage is formed between the cylindrical outer periphery of the flighted portion and the inner wall of the barrel. In a mottling application of the apparatus, materials of diverse coloration are softened by the flighted rear portion of the screw but not yet fully mixed so that distinct color patterns are present. When the material reaches the unflighted portion, it will be forced forwardly by the forward pressure developed as the screw continues to pump material forwardly, but the only shear imparted thereto is the gentle wiping action produced by the inner wall of the barrel and the outer periphery of the unflighted portion of the screw so that the streaked condition of the material remains intact. In the case of glass reinforced materials, the circumferential wiping action produced by the unflighted section of the screw aids in wet-out.

摘要翻译： 一种用于塑料材料注射成型的方法和装置，其中螺杆的前部被设计成使材料的混合和剪切最小化。 当处理具有不同着色的材料以便产生斑驳的产品时，并且还用于加工玻璃增强材料的加工材料是有利的，其中高剪切加工将破坏纤维，从而导致较低质量的产品。 通过提供具有完全飞行的后部的螺钉来实现筒的前部中的材料的低剪切加工，但是具有无飞行的前部，使得在圆筒形的外圆周之间形成大致无阻碍的环形流动通道 枪管的飞行部分和内壁。 在该设备的斑驳应用中，不同着色的材料被螺丝的后排部分软化，但尚未完全混合，从而存在不同的颜色图案。 当材料到达未被打开的部分时，当螺杆继续向前泵送材料时，由向前压力产生的向前的压力将被强制向前施加，但是施加到其上的唯一剪切是由筒的内壁和外周产生的温和擦拭作用 的螺丝的未打开的部分，使得材料的条纹条件保持完整。 在玻璃增强材料的情况下，由螺丝的未开启部分产生的周向擦拭作用有助于润湿。