公开(公告)号：EP0321160A3

公开(公告)日：1990-06-27

申请号：EP88311706.1

申请日：1988-12-09

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17 ,  B29C45/23 ,  B29C45/28 ,  B29C67/22

CPC分类号： B29C44/105 ,  B29C45/1735 ,  B29C45/2806

摘要： An injection molding method and nozzle for use therein wherein first and second variable pressures are applied to a piston of a valve mechanism of the nozzle so that a differential fluid pressure on the piston causes a tip portion of the valve mechanism to alternately open and close. In this way, the tip portion communicates the flow of resin from a nozzle body of the nozzle to an injection aperture of a mold. Differential pressure on the piston prevents a fluid which distributes the molten resin over the interior surfaces of the mold from entering the flow path of the molten resin in the nozzle body. The fluid preferably is a gas, such as nitrogen. Preferably, the piston is mounted for reciprocating movement within the nozzle body and the first pressure is provided by the resin during resin injection and the second pressure is partially applied by the nitrogen gas. Preferably, the valve mechanism includes a counterbalance mechanism which is set to prevent fluid entry into the mold until the tip portion of the valve mechanism is closed. The resulting article is then cooled to a temperature below the softening point of the resin, the pressure is relieved within the article and the mold is opened to remove the article. The nozzle may also be utilized in making structural foam articles from a foamable resin. The pressure within the mold is relieved to permit foaming by the foamable resin after injection of the foamable resin.

公开(公告)号：EP0321117B2

公开(公告)日：2005-07-13

申请号：EP88311260.9

申请日：1988-11-28

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17

CPC分类号： B29C45/1704

公开(公告)号：EP0321160B2

公开(公告)日：2000-08-02

申请号：EP88311706.1

申请日：1988-12-09

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17 ,  B29C45/23 ,  B29C45/28 ,  B29C67/20

CPC分类号： B29C44/105 ,  B29C45/1735 ,  B29C45/2806

公开(公告)号：EP0321117A3

公开(公告)日：1990-07-11

申请号：EP88311260.9

申请日：1988-11-28

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17

CPC分类号： B29C45/1704

摘要： A method and system are disclosed for locally introducing fluid, such as a gas, at a predetermined location into molten resin downstream from a resin injection aperture to form a hollow part. The gas is utilized at the localized area to distribute the molten resin, to eliminated molded in stress and to prevent formation of sink marks in the part during resin solidification. An overflow reservoir (112) outside of the mold cavity (114) is filled with the resin during resin injection and then the gas is introduced into the reservoir (112) through a fluid aperture (116, 118) and into the part. The reservoir creates a cocoon of solidified material to act as a seal to prevent gas leakage. One hollow body formed by the method and system includes a substantially endless hollow body portion with a fluid opening for communicating the interior of the hollow body portion with the locally introduced fluid. The hollow body provides an internal gas manifold and means for greater struc­tural integrity.

公开(公告)号：EP0321160A2

公开(公告)日：1989-06-21

申请号：EP88311706.1

申请日：1988-12-09

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17 ,  B29C45/23 ,  B29C45/28 ,  B29C67/22

CPC分类号： B29C44/105 ,  B29C45/1735 ,  B29C45/2806

摘要： An injection molding method and nozzle for use therein wherein first and second variable pressures are applied to a piston of a valve mechanism of the nozzle so that a differential fluid pressure on the piston causes a tip portion of the valve mechanism to alternately open and close. In this way, the tip portion communicates the flow of resin from a nozzle body of the nozzle to an injection aperture of a mold. Differential pressure on the piston prevents a fluid which distributes the molten resin over the interior surfaces of the mold from entering the flow path of the molten resin in the nozzle body. The fluid preferably is a gas, such as nitrogen. Preferably, the piston is mounted for reciprocating movement within the nozzle body and the first pressure is provided by the resin during resin injection and the second pressure is partially applied by the nitrogen gas. Preferably, the valve mechanism includes a counterbalance mechanism which is set to prevent fluid entry into the mold until the tip portion of the valve mechanism is closed. The resulting article is then cooled to a temperature below the softening point of the resin, the pressure is relieved within the article and the mold is opened to remove the article. The nozzle may also be utilized in making structural foam articles from a foamable resin. The pressure within the mold is relieved to permit foaming by the foamable resin after injection of the foamable resin.

摘要翻译： 一种注射成型方法和用于其中的喷嘴，其中第一和第二可变压力施加到喷嘴的阀机构的活塞，使得活塞上的差动流体压力使得阀机构的尖端部分交替地打开和关闭。 以这种方式，尖端部分将树脂从喷嘴的喷嘴体流到模具的喷射孔。 活塞上的差压防止了将熔融树脂分布在模具的内表面上的流体进入喷嘴体内的熔融树脂的流动路径。 流体优选为气体，例如氮气。 优选地，活塞被安装用于在喷嘴体内往复运动，并且在树脂注射期间由树脂提供第一压力，并且第二压力被氮气部分地施加。 优选地，阀机构包括平衡机构，其被设置为防止流体进入模具直到阀机构的末端部分闭合。 然后将所得制品冷却至低于树脂软化点的温度，在制品内释放压力，打开模具以除去制品。 喷嘴也可用于从可发泡树脂制造结构泡沫制品。 在注射可发泡树脂之后，模具内的压力被释放以允许发泡树脂发泡。

公开(公告)号：EP0321117B1

公开(公告)日：1993-12-22

申请号：EP88311260.9

申请日：1988-11-28

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17

CPC分类号： B29C45/1704

公开(公告)号：EP0321160B1

公开(公告)日：1993-05-12

申请号：EP88311706.1

申请日：1988-12-09

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17 ,  B29C45/23 ,  B29C45/28 ,  B29C67/22

CPC分类号： B29C44/105 ,  B29C45/1735 ,  B29C45/2806

公开(公告)号：EP0321117A2

公开(公告)日：1989-06-21

申请号：EP88311260.9

申请日：1988-11-28

申请人： Melea Limited

发明人： Loren, Norman S.

IPC分类号： B29C45/17

CPC分类号： B29C45/1704

摘要： A method and system are disclosed for locally introducing fluid, such as a gas, at a predetermined location into molten resin downstream from a resin injection aperture to form a hollow part. The gas is utilized at the localized area to distribute the molten resin, to eliminated molded in stress and to prevent formation of sink marks in the part during resin solidification. An overflow reservoir (112) outside of the mold cavity (114) is filled with the resin during resin injection and then the gas is introduced into the reservoir (112) through a fluid aperture (116, 118) and into the part. The reservoir creates a cocoon of solidified material to act as a seal to prevent gas leakage. One hollow body formed by the method and system includes a substantially endless hollow body portion with a fluid opening for communicating the interior of the hollow body portion with the locally introduced fluid. The hollow body provides an internal gas manifold and means for greater struc­tural integrity.

摘要翻译： 公开了一种用于将诸如气体的流体在预定位置局部引入到树脂注入孔下游的熔融树脂中以形成中空部分的方法和系统。 在局部区域使用气体来分配熔融树脂，以消除模塑应力，并防止在树脂固化期间在部件中形成凹痕。 在树脂注入期间，在模腔（114）外部的溢流容器（112）被树脂填充，然后气体通过流体孔（116,118）被引入储存器（112）并进入该部件。 储存器产生凝固材料的茧作为密封以防止气体泄漏。 通过该方法和系统形成的一个中空体包括基本上环状的中空主体部分，其具有用于将中空主体部分的内部与局部引入的流体连通的流体开口。 中空体提供内部气体歧管和用于更大结构完整性的装置。