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Pprocess for producing a stampable reinforced composite semi-finished product

A technology of composite materials and semi-finished products, applied in the direction of coating, etc., can solve the problems affecting the cost and price of composite semi-finished products, excessive non-uniformity, defective mechanical properties, etc.

Inactive Publication Date: 2009-04-15
法国费保利内
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of powders and fine particle sizes also affects the cost price of composite semi-finished products
[0014] Conversely, if a powder is chosen that is too coarse, the mixture of particles and fibers runs the risk of being too inhomogeneous to such an extent that the composite semi-finished product risks reduced or even defective mechanical properties

Method used

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  • Pprocess for producing a stampable reinforced composite semi-finished product

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Embodiment Construction

[0047] The accompanying drawing thus illustrates a production line for semi-finished products made of composite material according to one embodiment of the method which is the subject of the invention. In this production line, the conveyor device 1 comprises a conventional conveyor whose belt advances in the direction indicated by the arrow 15 .

[0048] During a first step illustrated by the figures, the lower layer 2 is deposited on the belt of the conveyor 1 . The lower layer 2 is in this case in the form of a film wound on a roll 3 and unrolled synchronously with the advancement of the conveyor 1 .

[0049] According to the invention, the lower layer 2 comprises a plastic whose softening point is lower than that of the reinforcing fibers constituting the semifinished product obtained according to the method that is the subject of the invention. This lower layer 2 is made to bond with the rest of the composite semi-finished product during a heat treatment step as described...

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Abstract

Process for producing a stampable reinforced composite semi-finished product comprising one or more plastics and chopped fibres or continuous filaments (4), the softening temperature of which is above the highest of the softening temperatures of said materials, which process comprises the steps consisting in: depositing said fibres or filaments (4), especially by gravity, onto a conveyor (1); sprinkling particles (6) of a powder of said plastics onto said fibres or said filaments (4), in a proportion of between 5% and 90% of the total weight; blending said particles (6) with said fibres or said filaments (4); and heating the blend to a temperature above the softening temperatures of said materials, characterized in that the blending step includes subjecting said blend (4, 6) to at least one electric field approximately perpendicular to the direction of advance (15) of said conveyor (1).

Description

technical field [0001] The invention relates to a method for producing fiber-reinforced plastic composite semi-finished products. More specifically, the invention relates to a method of using the plastic forming the semi-finished binder in powder form. [0002] The term "plastic" denotes any synthetic material based on the use of macromolecules and deformable by molding, forming or casting, usually with the aid of heat and pressure. Background technique [0003] In a conventional method of manufacturing a composite semi-finished product, such as that described in document US-A-4 487 647, the binder of the semi-finished product may be mixed in pulverulent form with reinforcing filaments or yarns. The yarn is first deposited, usually by gravity, onto a conveyor, thereby forming a kind of mat, and then particles of bonded plastic powder are sprayed, and the assembly is subsequently heated to melt the bonded plastic. The components are then cooled to obtain a reinforced, stamp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/50B29B15/12
CPCB29C70/506B29C70/508B29B15/105B29B15/12B29C70/50
Inventor 洛朗斯·卡拉马罗约里克·马迪埃尔
Owner 法国费保利内
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