Fiber reinforced plastic bolt and method for producing the same

Patent metadata

Field	Value
Publication number	US-9316244-B2
Application number	US-201313955317-A
Country	US
Kind code	B2
Filing date	Jul 31, 2013
Priority date	Jun 3, 2009
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A fiber reinforced plastic bolt (FRP) and a method for producing the same are disclosed. The FRP bolt is useful in the industrial areas which require a bolt having electric-insulation, anti-corrosive, thermal-insulation, and non-magnetic properties. The method for producing the FRP bolt includes the steps of: winding a prepreg around a surface of an internal body, wherein the internal body includes a first reinforcing fiber which is unidirectionally aligned along the axis of the bolt, and a synthetic resin which is impregnated into the first reinforcing fiber, and the prepreg includes a second reinforcing fiber and a thermosetting resin which is impregnated into the second reinforcing fiber; forming a fiber reinforced plastic round bar by heat-hardening the prepreg; and forming a screw thread on the surface of the fiber reinforced plastic round bar.

First claim

The invention claimed is:

1. A fiber reinforced plastic bolt comprising:
an internal body which includes a first reinforcing fiber unidirectionally aligned along the axis of the bolt, and a synthetic resin which is impregnated into the first reinforcing fiber, and
a hardened prepreg layer which is wound around the internal body, and includes a second reinforcing fiber and a thermosetting resin which is impregnated into the second reinforcing fiber,
wherein the hardened prepreg layer is formed by winding a prepreg having a shape of a sheet and a thickness of 0.02 to 2.5 mm around the internal body 2 to 50 turns, and a screw thread is formed on an outer surface of the hardened prepreg layer, and
wherein the volume amount of the second reinforcing fiber is 45 to 60% and the volume of the thermosetting resin is 40 to 55% based on the total volume of the prepreg.

2. The fiber reinforced plastic bolt of claim 1 , wherein the first reinforcing fiber is long fiber continuously extended along the direction of the internal body.

3. The fiber reinforced plastic bolt of claim 1 , wherein a distance between a root of the screw thread and the internal body is more than 0.1 mm.

Assignees

• Sk Chemicals Co Ltd
• Samsung Heavy Ind

Inventors

• Jeong Hoon-Heui
• Park Yong-Min
• Kim Hyun-Seok

Classifications

• B29C70/545

  Perforating, cutting or machining during or after moulding · CPC title

• B29C70/083 Primary

  Combinations of continuous fibres or fibrous profiled structures oriented in one direction and reinforcements forming a two dimensional structure, e.g. mats (B29D24/00, B29D99/001 take precedence) · CPC title

• B29L2001/002

  Bolts · CPC title

• B29C70/347

  combined with compressing after the winding of lay-ups having a non-circular cross-section, e.g. flat spiral windings · CPC title

• F16B33/006 Primary

  Non-metallic fasteners using screw-thread · CPC title