Process for manufacturing carbon fiber fabrics and fabric manufactured with this process

Abstract

A fabric containing carbon fibers impregnated with a silicone, polyurethane or acrylic emulsion which is then dried together with the fabric is disclosed. A protective layer containing a film, a woven or non-woven fabric is applied onto one side of the fabric.

Claims

1. A cured, carbon fiber fabric comprising: carbon fibers impregnated with a first coating of silicone, polyurethane or acrylic emulsion which is then dried together with the fabric, and impregnated with a second coating of an aliphatic solution comprising polyacrylates or glycols and thereafter dried, wherein at least one protective layer comprising a film, a woven fabric or a nonwoven fabric is applied onto one side of the fabric, wherein the cured, carbon fiber fabric is foldable, and wherein the surface of the protective layer contacting the fabric partially penetrates the fabric, so as to create an intermediate layer in which the outer filaments of the fabric are integral with the protective layer.

2. The fabric according to claim 1, wherein the fabric is impregnated with a percentage of silicone, polyurethane or acrylic emulsion between 1% and 60% of the weight of the fabric.

3. The fabric according to claim 1, wherein the protective layer is laminated to the side of the fabric.

4. The fabric according to the claim 1, wherein the protective layer comprises a polyurethane, polyamide or acrylic film.

5. The fabric according to claim 1, wherein the thickness of the intermediate layer is between 5% and 60% of the thickness of the fabric.

6. The fabric according to claim 1, wherein the basis weight of the aliphatic solution is between 48 and 90 g/m.sup.2.

7. The fabric according to claim 1, wherein the carbon fibers are impregnated with a third coating of an aqueous emulsion of isocyanate or crosslinking polyurea substances, after which the fabric is dried.

8. The fabric according to claim 1, wherein the thickness of the fabric in its initial non-impregnated state is between 50 and 1000 microns.

9. The fabric according to claim 1, wherein the basis weight of the fabric in its initial non-impregnated state is between 170 and 270 g/m.sup.2.

10. The fabric according to claim 1, wherein the basis weight of the fabric in its final state is between 260 and 320 g/m.sup.2.

11. The fabric according to claim 1, wherein at least one edge of the fabric is folded and sewn on itself so as to form a hem.

12. The fabric according to claim 1, wherein the fabric in its final state is deformable along two transversal curvature axes.

13. The fabric according to claim 1, comprising at least one weave of yarns of carbon fiber having a linear density between 50 and 5000 g/km and comprising from 1000 to 60000 filaments having a diameter between 5 and 10 microns.

14. The fabric according to claim 1, wherein the thickness of the protective layer is c between 50 and 500 microns.

15. The fabric according to claim 1, wherein the basis weight of the protective layer is between 20 and 40 g/m.sup.2.

16. A lining for motor vehicles, comprising a fabric according to claim 1.

17. A product or accessory of clothing or leather goods, comprising a fabric according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages and characteristics of the fabric and of the process according to the present invention will become apparent to those skilled in the art from the following detailed and non-limiting description of an embodiment thereof with reference to the accompanying drawings in which:

(2) FIG. 1 shows a partial section of the fabric during a step of the process;

(3) FIG. 2 shows the fabric of FIG. 1 during a subsequent step of the process;

(4) FIG. 3 shows the fabric of FIG. 1 during a subsequent step of the process; and

(5) FIG. 4 shows the fabric of FIG. 1 during a further step of the process.

DETAILED DESCRIPTION OF THE INVENTION

(6) Referring to FIG. 1, it is seen that fabric 1 according to the present invention comprises at least a weave, in particular cloth, twill or satin weave, of yarns of carbon fiber having a linear density between 50 and 5000 g/km and comprising from 1000 to 60000 filaments, in particular from 3000 to 24000 filaments having a diameter comprised between 5 and 10 microns. The thickness of fabric 1 is comprised between 50 and 1000 microns. The basis weight of fabric 1 is comprised between 170 and 270 g/m.sup.2, in particular 210 and 220 g/m.sup.2.

(7) In a first preliminary operating step, to ensure the regularity and a good aesthetic finish of the weave, fabric 1 is brushed and/or stretched at a temperature comprised between 30 and 200 and/or at a pressure comprised between 1 and 100 bar by means of two cylinders or two plates suitable to exert a variable pressure.

(8) In a second preliminary operating step, at least one protective layer 2, in particular comprising a film, a woven fabric or a nonwoven fabric, more particularly a polyurethane, polyamide or acrylic film, is applied onto one side of fabric 1. The thickness of the protective layer 2 is comprised between 50 and 500 microns. The basis weight of the protective layer 2 is comprised between 20 and 40 g/m.sup.2, in particular 25 and 35 g/m.sup.2. The protective layer 2 is applied to fabric 1 by means of a lamination, in particular a hot calendering or pressing, in which fabric 1 and the protective layer 2 are laminated together at a temperature comprised between 30 and 200 and/or at a pressure comprised between 10 and 200 bar. During this operating step the surface of the protective layer 2 in contact with fabric 1 partially penetrates fabric 1, so as to create an intermediate layer 3, having a thickness comprised between 5% and 60% of the thickness of fabric 1, in which the outer filaments of fabric 1 are integral with the protective layer 2.

(9) Referring to FIG. 2, it is seen that in a main operating step fabric 1 is impregnated with a silicone, polyurethane or acrylic emulsion 4 by means of sprayers 5, or by smearing, immersion or with a hot-melt transfer procedure. Sprayers 5 are arranged on the opposite side of fabric 1 with respect to the protective layer 2, namely fabric 1 is comprised between the protective layer 2 and sprayers 5. Fabric 1 with the silicone, polyurethane or acrylic emulsion 4 is pressed through laminating rollers at a pressure exerted by the rollers comprised between 1 and 100 bar to penetrate the silicone, polyurethane or acrylic emulsion 4 into fabric 1 and remove the exceeding quantity.

(10) In a subsequent step of the process the silicone, polyurethane or acrylic emulsion 4 in fabric 1 is dried, in particular through a heat treatment in an oven at a temperature comprised between 20 and 200 C., for a time comprised between 2 and 40 hours. At the end of this drying step fabric 1 is impregnated with a percentage of silicone, polyurethane or acrylic emulsion 4 comprised between 1% and 60% of the weight of fabric 1.

(11) Referring to FIG. 3, it is seen that in a subsequent optional step of the process, an aliphatic solution 6 is sprayed by means of the same sprayers 5 or of other sprayers onto fabric 1, so as to apply a basis weight of the aliphatic solution 6 comprised between 48 and 90 g/m.sup.2, in particular 55 g/m.sup.210% or 80 g/m.sup.210%, after which the aliphatic solution 6 is dried.

(12) The aliphatic solution 6 comprises polyacrylates, glycols and/or aliphatic polyurethane compounds, in particular opacifiers. The aliphatic solution 6 can also comprise silicon-oxygen chains.

(13) Referring to FIG. 4, it is seen that in a further optional step of the process, an aqueous emulsion 7 of isocyanate and/or crosslinking polyurea substances is sprayed by means of the same spraying 5 or of other sprayers onto fabric 1, after which this aqueous emulsion 7 is dried.

(14) The basis weight of the fabric 1 at the end of the process is preferably comprised between 260 and 320 g/m.sup.2.

(15) In an alternative embodiment, the silicone, polyurethane or acrylic emulsion 4 can be applied to fabric 1 in the described above manner before applying the protective layer 2.

(16) In a final operating step, at least one edge of fabric 1 impregnated with the silicone, polyurethane or acrylic emulsion 4 and joined to the protective layer 2, if any, is folded and sewn on itself so as to form a hem.

(17) Possible variants and/or additions may be made by those skilled in the art to the embodiment of the invention here described and illustrated remaining within the scope of the following claims. In particular, further embodiments of the invention may include the technical features of one of the following claims, with the addition of one or more technical features, taken individually or in any mutual combination, described in the text and/or illustrated in the drawings.