Peel ply for elongate composite matertals

Patent metadata

Field	Value
Publication number	US-11697254-B2
Application number	US-202017602095-A
Country	US
Kind code	B2
Filing date	Apr 2, 2020
Priority date	Apr 11, 2019
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

An assembly ( 113 ) for composite manufacture is provided. The assembly comprises a cured resin impregnated reinforcement material ( 112 ) comprising a fibre component and a resin matrix component, in which the resin matrix component comprises polyurethane, the assembly having a length to width ratio of at least 5:1, and the assembly defining a longitudinal direction (L) along its length; and a peel ply ( 116 ) in contact with the cured resin impregnated reinforcement material ( 112 ), the peel ply ( 116 ) comprising a woven layer having a plurality of longitudinal fibres ( 118 ) extending in the longitudinal direction (L); and a plurality of transverse fibres ( 120 ) extending in a transverse direction (T) normal to the longitudinal direction (L); in which the areal density of the plurality of transverse fibres ( 120 ) is higher than the areal density of the plurality of longitudinal fibres ( 118 ).

First claim

The invention claimed is:

1. An assembly ( 113 ) for composite manufacture, the assembly comprising:
a resin impregnated reinforcement material ( 112 ) which is at least partially cured comprising a fibre component and a resin matrix component, in which the resin matrix component comprises polyurethane, the assembly having a length to width ratio of at least 5:1, and the assembly defining a longitudinal direction (L) along its length; and,
a peel ply ( 116 ) in contact with the cured resin impregnated reinforcement material ( 112 ), the peel ply ( 116 ) comprising a woven layer having:

a plurality of longitudinal fibres ( 118 ) extending in the longitudinal direction (L); and,
a plurality of transverse fibres ( 120 ) extending in a transverse direction (T) normal to the longitudinal direction (L);
in which the areal density of the plurality of transverse fibres ( 120 ) is higher than the areal density of the plurality of longitudinal fibres ( 118 ).

2. The assembly ( 113 ) according to claim 1 , wherein the areal density of the plurality of transverse fibres ( 120 ) is at least from 10% to 40% greater than the areal density of the plurality of longitudinal fibres ( 118 ).

3. The assembly ( 113 ) according to claim 2 , wherein there are a higher number of transverse fibres ( 120 ) per unit length in the longitudinal direction (DL) than the number of longitudinal fibres ( 118 ) per unit length in the transverse direction (DT).

4. The assembly ( 113 ) according to claim 3 , wherein the ratio of the number of transverse fibres ( 120 ) per unit length in the longitudinal direction (DL) to the number of longitudinal fibres ( 118 ) per unit length in the transverse direction (DT) is from 1.3:1 to 1.15:1.

5. The assembly ( 113 ) according to claim 4 , wherein the number of transverse fibres ( 120 ) in the longitudinal direction (L) is from 15 to 30 per 10 mm and/or wherein the number of longitudinal fibres ( 118 ) in the transverse direction (T) is from 15 to 30 per 10 mm.

6. The assembly ( 113 ) according to claim 5 , wherein the linear density of the transverse fibres ( 120 ) is greater than the linear density of the longitudinal fibres ( 118 ).

7. The assembly ( 113 ) according to claim 6 , wherein the linear density of the transverse fibres ( 120 ) is from 125 to 175%.

8. The assembly ( 113 ) according to claim 7 , wherein the dtex of the transverse fibres ( 120 ) is from 150 to 400; and/or wherein the dtex of the longitudinal fibres ( 118 ) is from 150 to 400.

9. The assembly ( 113 ) according to claim 8 in which the longitudinal fibres ( 118 ) and/or the transverse fibres ( 120 ) of the peel ply ( 116 ) are formed from nylon or polyamide.

10. The assembly ( 113 ) according to claim 9 , wherein the transverse fibres ( 120 ) are constructed from a different material to the longitudinal fibres ( 118 ).

11. The assembly ( 113 ) according to claim 10 , wherein the longitudinal fibres ( 118 ) are warp fibres and the transverse fibres ( 120 ) are weft fibres.

12. The assembly ( 113 ) according to claim 11 , in which the peel ply ( 116 ) is at least partially embedded in the matrix of the cured resin impregnated reinforcement material ( 112 ).

13. The assembly ( 113 ) according to claim 12 , in which the assembly ( 113 ) is a pultruded product.

14. The assembly ( 113 ) according to claim 13 , in which the average overall areal mass of the peel ply ( 116 ) is from 75 to 175 g/m2.

Assignees

• Hexcel Composites Ltd
• Hexcel Holding Gmbh
• Hexcel Corp

Inventors

• Moser Johannes
• Hung Yu-Chen
• Reagan Erin

Classifications

• B29C70/682

  Preformed parts characterised by their structure, e.g. form · CPC title

• B29C70/525 Primary

  Component parts, details or accessories; Auxiliary operations · CPC title

• B29C70/54

  Component parts, details or accessories; Auxiliary operations {, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing} · CPC title

• B29C70/086

  and with one or more layers of pure plastics material, e.g. foam layers (applying a non-preformed coating, e.g. a gel-coat, B29C37/0025; with foam blocks B29C70/86) · CPC title

• B29C70/688

  the inserts being meshes or lattices (B29C70/82, B29C70/683 take precedence) · CPC title