Maro Publications



From 03/24/2014  
to 7/9/2012

Maro Topics

Patent Abstracts

Patent Titles




2. “Prepreg is a term for pre-impregnated fibers. A prepreg is typically a sheet-like product, in which reinforced fibers are pre-impregnated with a resin, i.e., binder, and is an intermediate product for producing a composite material product. As the reinforced fibers, carbon fibers, glass fibers, aramid fibers, etc. are mainly used. As the binder, epoxy resin, polyester resin, thermoplastic resin, etc. are typically used. A prepreg in the form of a fabric, such as cloth, can be molded into a predetermined shape by a mold, and cured to form a reinforced resin product such as a fiber-reinforced plastic (FRP).

The prepreg is formed into various products according to the type of fibers, the arrangement of fibers, and the type of binder used. The composite materials produced using the prepreg have improved properties such as strength, hardness, corrosion resistance, fatigue life, impact resistance, etc. compared to other materials. “

[Prepreg, US Patent 8,419,881 (4/16/2013)]


1. “Pre-preg is a term for "pre-impregnated" composite fibres where a material, such as epoxy is already present. These usually take the form of a weave or are uni-directional. They already contain an amount of the matrix material used to bond them together and to other components during manufacture. The pre-preg are mostly stored in cooled areas since activation is most commonly done by heat. Hence, composite structures built of pre-pregs will mostly require an oven or autoclave to cure out.

There are several advantages and disadvantages of the pre-preg process in comparison to the hot injection process. Pre-preg allows one to impregnate the fibers on a flat workable surface, or rather in an industrial process, and then later form the impregnated fibers to a shape which could prove to be problematic for the hot injection process. Prepreg also allows one to impregnate a bulk amount of fiber and then store it in a cooled area for an extended period of time to cure later. Unfortunately the process can also be time consuming in comparison to the hot injection process.”

(Wikipedia, Prepregs, 7/9/2012)


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(RDC 6/5/2012)


Roger D. Corneliussen

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921


Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

* Date of latest addition; date of first entry is 7/9/2012.