Method for producing FRP

Patent metadata

Field	Value
Publication number	US-9950479-B2
Application number	US-201615230978-A
Country	US
Kind code	B2
Filing date	Aug 8, 2016
Priority date	Feb 25, 2011
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A method of producing FRP includes disposing a preform made of a reinforcing fiber base material in a cavity of a mold, providing a resin injection path and a suction path that sucks at least air to the mold, and causing resin from the resin injection path to flow in a direction toward the suction path in the cavity to be impregnated into the preform, wherein 1) a high flow resistance region for partially making the resin flowing in the preform hardly flow is formed in the preform itself, 2) a flow front of the resin flowing in the direction toward the suction path through the high flow resistance region is controlled to settle within a permitted region that has been predetermined relative to a shape of a product to be molded, 3) the resin injection path is formed from a runner provided around the preform and the suction path is disposed at a central portion of the preform, and the high flow resistance region is formed at a corresponding part corresponding to a part around the suction path as a high flow resistance region to cause the resin flowing in the preform from a part around the corresponding part toward the corresponding part hardly flow at the corresponding part.

First claim

What is claimed is:

1. A method of producing FRP comprising disposing a preform made of a reinforcing fiber base material in a cavity of a mold, providing a resin injection path and a suction path that sucks at least air to said mold, and causing resin from said resin injection path to flow in a direction toward said suction path in said cavity to be impregnated into said preform, wherein 1) a high flow resistance region for partially making said resin flowing in said preform hardly flow is formed in said preform itself, 2) a flow front of said resin flowing in said direction toward said suction path through said high flow resistance region is controlled to settle within a permitted region that has been predetermined relative to a shape of a product to be molded, 3) said resin injection path is formed from a runner provided around said preform and said suction path is disposed at a central portion of said preform, and said high flow resistance region is formed at a corresponding part corresponding to a part around said suction path as a high flow resistance region to cause said resin flowing in said preform from a part around said corresponding part toward said corresponding part hardly flow at said corresponding part.

2. The method according to claim 1 , wherein said high flow resistance region is formed at a position outside a molded product relative to an outline of said product to be molded or at a position where an appearance design property is not required in said product to be molded.

3. The method according to claim 1 , wherein resin having flowed into said high flow resistance region is detected at a position near said portion provided with said suction path.

4. The method according to claim 1 , wherein said high flow resistance region is formed by reducing a thickness of said preform at said high flow resistance region by said mold.

5. The method according to claim 1 , wherein said high flow resistance region is formed by increasing density of an arrangement of reinforcing fibers in said preform at a position of said high flow resistance region in advance.

6. The method according to claim 1 , wherein said preform is formed from a laminate of a plurality of reinforcing fiber base materials, and resin flow resistance of a reinforcing fiber base material of an inner layer is lower than that of a reinforcing fiber base material of a surface layer.

7. The method according to claim 1 , wherein a thickness of said preform in an area within said product to be molded before being disposed is greater than a height of a corresponding part of said cavity.

8. The method according to claim 2 , wherein resin having flowed into said high flow resistance region is detected at a position near said portion provided with said suction path.

Assignees

• Toray Industries
• Toray Industries

Inventors

• Yamamoto Kohnosuke
• Tsuji Seiji
• Watanabe Kazuya

Classifications

• B29C70/48 Primary

  and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM] {, e.g. by vacuum} · CPC title

• B29C70/548

  using distribution constructions, e.g. channels incorporated in or associated with the mould · CPC title

• B29L2009/00

  Layered products · CPC title

• B29C45/0005

  using fibre reinforcements · CPC title

• B29K2105/06

  containing reinforcements, fillers or inserts · CPC title