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1. 发明授权

US06623838B1 Lightweight resin molded product and production method thereof 失效
标题翻译：轻质树脂成型体及其制造方法
公开(公告)号：US06623838B1
公开(公告)日：2003-09-23
申请号：US09508091
申请日：2000-03-16
申请人： Manabu Nomura , Toru Shima , Atsushi Sato , Hirofumi Gouda
发明人： Manabu Nomura , Toru Shima , Atsushi Sato , Hirofumi Gouda
IPC分类号： B32B328
CPC分类号： B29C45/0005 , B29C44/12 , B29C45/1705 , B29C2045/1723 , Y10T428/2457 , Y10T428/24744 , Y10T428/2495 , Y10T428/249971 , Y10T428/249986
摘要： Using a mold equipped with a rib-forming member capable of moving forward and backward relative to the mold cavity, produced is a lightweight, hollow resin molding having a reinforcing rib structure in the hollow area, from a fiber-containing thermoplastic resin having a fiber content of from 10 to 70% by weight. To produce the molding, a melt of a fiber-containing thermoplastic resin is injected into the mold cavity or is injected thereinto under compression, then the movable mold member is moved backward in the direction in which the mold cavity is expandable, and after the start of the mold member moving, a gas is introduced into the resin melt. Even though the molding has a hollow structure and has a large surface area, it has good stiffness and high strength, and has good appearances. The weight of the molding can be well controlled and reduced to any desired degree. The molding has many applications in various fields.
摘要翻译：使用具有能够相对于模腔前后移动的肋形成构件的模具，是具有在中空区域中具有加强肋结构的轻质中空树脂模制品，其具有纤维的含纤维热塑性树脂含量为10〜70重量％。为了制造模制品，将含纤维的热塑性树脂的熔体注射到模腔中或在压缩下被注入，然后可动模具沿模腔扩展的方向向后移动，并且在开始之后模具构件移动时，将气体引入到树脂熔体中。即使成型件具有中空结构并且具有大的表面积，其具有良好的刚度和高强度，并且具有良好的外观。模制品的重量可以很好地控制并减少到任何所需的程度。该模具在各个领域有很多应用。

2. 发明授权

US06511621B2 Method for injection-molding a propeller fan 失效
公开(公告)号：US06511621B2
公开(公告)日：2003-01-28
申请号：US09757618
申请日：2001-01-11
申请人： Atsushi Suzuki , Masashi Inoue , Fumio Kondoh , Naoki Toda , Matsuo Sakuma , Hirofumi Gouda , Manabu Nomura
发明人： Atsushi Suzuki , Masashi Inoue , Fumio Kondoh , Naoki Toda , Matsuo Sakuma , Hirofumi Gouda , Manabu Nomura
IPC分类号： B29C4402
CPC分类号： B29C44/428 , B29C45/561 , B29C2045/566 , B29L2031/08 , B29L2031/087
摘要： A method for injection-molding a plastics propeller fan by using a fixed-side mold section and movable-side mold section, comprises the steps of providing a movable core at an area corresponding to a thicker portion of a blade section of the propeller fan; after a predetermined amount of plastics material has been injected into a blade space of a mold cavity defined by the fixed-side mold section, movable-side metal section and movable core and conforming to the propeller fan, pushing out the movable core into the mold cavity and, after this step, bringing the movable core back to a normal position conforming to a mold shape defining the blade space and forming a proper fan.

3. 发明授权

US5750068A Gas-introduced injection molding and method of obtaining the same 失效
公开(公告)号：US5750068A
公开(公告)日：1998-05-12
申请号：US539598
申请日：1995-10-05
申请人： Hirofumi Gouda , Takayoshi Tanaka
发明人： Hirofumi Gouda , Takayoshi Tanaka
IPC分类号： B29C45/17 , B29C45/00
CPC分类号： B29C45/1705 , B29C45/1704 , Y10T428/24182 , Y10T428/24479 , Y10T428/24777 , Y10T428/24942 , Y10T428/2495
摘要： A gas-introduced injection molding is disclosed, which is obtained by charging molten resin into a die and introducing gas into the charged molten resin. The molding thus obtained has a sufficient thickness portion extending linearly as a framework and a sheet-like small thickness portion integral with the sufficient thickness portion and having a uniform thickness, a space being formed inside the sufficient thickness portion. Thus, even by reducing the overall thickness of the molding it is possible to ensure sufficient rigidity with the hollow portion, and the molding is thus best suited as a sheet-like product requiring a predetermined rigidity, such as an automobile bumper, a household electric product casing, etc. Such gas-introduced injection molding is produced by a method, which comprises a first step of charging molten resin into the die when the die is open to a predetermined extent from the completely closed state, a second step of closing the incompletely closed die to cause spreading of the charged molten resin, and a third step of introducing gas into the charged molten resin in the die. The second and third steps are started before the end of the first step. The molten resin in the die is thus caused to move continuously until the completion of the molding, thus preventing the generation of hesitation mark or sink mark.

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