CA2394982A1 - Air bag protective cover - Google Patents
Air bag protective cover Download PDFInfo
- Publication number
- CA2394982A1 CA2394982A1 CA 2394982 CA2394982A CA2394982A1 CA 2394982 A1 CA2394982 A1 CA 2394982A1 CA 2394982 CA2394982 CA 2394982 CA 2394982 A CA2394982 A CA 2394982A CA 2394982 A1 CA2394982 A1 CA 2394982A1
- Authority
- CA
- Canada
- Prior art keywords
- air bag
- nonwoven
- bag protective
- protective cover
- filaments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/235—Inflatable members characterised by their material
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/009—Condensation or reaction polymers
- D04H3/011—Polyesters
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/016—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the fineness
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
- D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/235—Inflatable members characterised by their material
- B60R2021/23504—Inflatable members characterised by their material characterised by material
Abstract
Air bag protective cover made of an endless filament nonwoven of polyester with surface weights of 60 - 200 g/m2, whereby the nonwoven is made of meltspun, stretched and immediately laid down endless filaments having a fibre titre of 1.5 - 5 dtex, preferably 2.4 - 3 dtex, whereby the laid fibre web is subjected to a consolidation by high pressure water jets, possibly after a pre-consolidation. The resulting material protects the airbag from dirt and damage and does not impede unfolding of the airbag.
Description
AIR BAG PROTECTIVE COVER
FIELD OF THE INVENTION
The invention relates to a protective cover for an air bag, in particular air bag covers made of a non-woven.
BACKGROUND ART
A cover for an air bag is known from DE 195 36 603, which cover is made of a polyethylene nonwoven web. Air bag covers or air bag protective envelopes are intended to protect the air bag on the one hand from dirt and damage, while they on the other hand should not only not impede the unfolding of the airbag in an accident situation but even support a preferred unfolding characteristic. Furthermore, the air bag protective envelope should be printable with warning notices. Consequently, the automotive industry demands from the supply industry a material which has high strength and low elongation values at a comparatively high tear propagation strength.
Furthermore, the material should be well printable and correspond to the requirements with respect to fire proofing properties. In particular, the material used for the manufacture of air bag protective envelopes should have very narrowly tolerated tear and tear propagation strengths. Very high demands are further placed on the continuous temperature resistance, the dust retention capacity and simultaneously a good air permeability for the avoidance of condensation problems.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an air bag protective envelope which fulfills the above mentioned demands.
This object is achieved in accordance with the invention with an air bag protective envelope made of an endless filament nonwoven with surface weights of 60-200 g/m2, whereby the nonwoven is made of melt spun, stretched endless filaments immediately laid into a nonwoven web and having a fibre titre of 1.5 - 5 dtex, preferably 2.4 - 3 dtex, and which nonwoven after laying is subjected to a subsequent solidification by high pressure water jets, possibly after a pre-consolidation. The isotropic filament distribution in the nonwoven obviates edging and the consideration of the machine direction during cutting. The air bag protective cover does not fray, due to the endless filaments. In addition, the air bag protective cover in accordance with the invention has a very good bending angle recovery of > 120° and has a very good seam and thread slide resistance of 200 N, measured according to standard BS 3320.
The material furthermore has no protruding fibres and therefore has no tendency to piling.
In addition, it has a high abrasion resistance and can be melt bonded, glued and sewed.
The air bag protective cover has a high strength, a low stretchability, a high dimensional stability and above all a very defined tear strength, which in combination with embossed tear lines allows a controllable unfolding of the air bag at a predetermined force. The tear propagation resistance is 120-200 N, measured according to standard DIN EN ISO 9073-4.
The consolidation of the nonwoven is preferably achieved in that the possibly preconsolidated nonwoven is subjected at least once on each side to high pressure water jets. The air bag protective cover thereby is provided with a good surface. A
preconsolidation is preferably achieved by needle punching.
The air bag protective cover is preferably also subjected to a point calendaring to increase its strength and abrasion resistance. The preconsolidated nonwoven is therefore guided through heated rollers of which at least one includes protrusions which lead to a point form melt bonding of the filaments to one another. Apart from the point calendaring, the air bag protective cover in accordance with the invention can also be subjected to a smooth calendaring to increase its strength, printability and abrasion resistance. For this, the consolidated nonwoven is guided through heated rollers.
The polyester for the air bag protective envelope is preferably admixed with an additive, such as color pigments, permanently active antistatics, flame retardants and/or additives which influence the hydrophobic properties, in amounts of up to 10% per wt.
Example 1 A filament web with a surface weight of 120 g/m2 is produced from polyester endless filaments with a titre of 2.8 dtex and subjected on both sides to a water jet consolidation at pressures up to 230 bar.
After the water jet treatment and after a subsequent point calendaring, the nonwoven has a thickness of 0.6mm. The tear resistance in machine direction was measured at 360 N and in transverse direction at 330 N. The tear propagation resistance was 166/151 N.
FIELD OF THE INVENTION
The invention relates to a protective cover for an air bag, in particular air bag covers made of a non-woven.
BACKGROUND ART
A cover for an air bag is known from DE 195 36 603, which cover is made of a polyethylene nonwoven web. Air bag covers or air bag protective envelopes are intended to protect the air bag on the one hand from dirt and damage, while they on the other hand should not only not impede the unfolding of the airbag in an accident situation but even support a preferred unfolding characteristic. Furthermore, the air bag protective envelope should be printable with warning notices. Consequently, the automotive industry demands from the supply industry a material which has high strength and low elongation values at a comparatively high tear propagation strength.
Furthermore, the material should be well printable and correspond to the requirements with respect to fire proofing properties. In particular, the material used for the manufacture of air bag protective envelopes should have very narrowly tolerated tear and tear propagation strengths. Very high demands are further placed on the continuous temperature resistance, the dust retention capacity and simultaneously a good air permeability for the avoidance of condensation problems.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an air bag protective envelope which fulfills the above mentioned demands.
This object is achieved in accordance with the invention with an air bag protective envelope made of an endless filament nonwoven with surface weights of 60-200 g/m2, whereby the nonwoven is made of melt spun, stretched endless filaments immediately laid into a nonwoven web and having a fibre titre of 1.5 - 5 dtex, preferably 2.4 - 3 dtex, and which nonwoven after laying is subjected to a subsequent solidification by high pressure water jets, possibly after a pre-consolidation. The isotropic filament distribution in the nonwoven obviates edging and the consideration of the machine direction during cutting. The air bag protective cover does not fray, due to the endless filaments. In addition, the air bag protective cover in accordance with the invention has a very good bending angle recovery of > 120° and has a very good seam and thread slide resistance of 200 N, measured according to standard BS 3320.
The material furthermore has no protruding fibres and therefore has no tendency to piling.
In addition, it has a high abrasion resistance and can be melt bonded, glued and sewed.
The air bag protective cover has a high strength, a low stretchability, a high dimensional stability and above all a very defined tear strength, which in combination with embossed tear lines allows a controllable unfolding of the air bag at a predetermined force. The tear propagation resistance is 120-200 N, measured according to standard DIN EN ISO 9073-4.
The consolidation of the nonwoven is preferably achieved in that the possibly preconsolidated nonwoven is subjected at least once on each side to high pressure water jets. The air bag protective cover thereby is provided with a good surface. A
preconsolidation is preferably achieved by needle punching.
The air bag protective cover is preferably also subjected to a point calendaring to increase its strength and abrasion resistance. The preconsolidated nonwoven is therefore guided through heated rollers of which at least one includes protrusions which lead to a point form melt bonding of the filaments to one another. Apart from the point calendaring, the air bag protective cover in accordance with the invention can also be subjected to a smooth calendaring to increase its strength, printability and abrasion resistance. For this, the consolidated nonwoven is guided through heated rollers.
The polyester for the air bag protective envelope is preferably admixed with an additive, such as color pigments, permanently active antistatics, flame retardants and/or additives which influence the hydrophobic properties, in amounts of up to 10% per wt.
Example 1 A filament web with a surface weight of 120 g/m2 is produced from polyester endless filaments with a titre of 2.8 dtex and subjected on both sides to a water jet consolidation at pressures up to 230 bar.
After the water jet treatment and after a subsequent point calendaring, the nonwoven has a thickness of 0.6mm. The tear resistance in machine direction was measured at 360 N and in transverse direction at 330 N. The tear propagation resistance was 166/151 N.
Claims (7)
1. Air bag protective covers made of an endless filament nonwoven of polyester with surface weights of 60-200 g/m2, whereby the nonwoven is made of melt spun, stretched endless filaments immediately laid into a nonwoven web and having a fibre titre of 1.5 - 5 dtex, and thereafter subjected to a high pressure water jet treatment.
2. Air bag protective envelope according to claim 1, wherein the consolidation of the nonwoven is carried out in that the nonwoven is subjected to high pressure water jets at least once from each side.
3. Air bag protective envelope according to one of claims 1 or 2, wherein the nonwoven is point or smooth calendared after consolidation.
4. Air bag protective envelope according to one of claims 1 to 3, wherein the polyester is admixed in amounts up to 10% per wt. with at least one additive, selected from the group of color pigments, permanently active antistatics, flame retardants and additives influencing the hydrophobic properties.
5. Air bag protective envelope according to claim 4, wherein the dying of the endless filaments is carried out by dope dying.
6. Air bag protective cover according to any one of claims 1 to 5, wherein the filaments have a fibre titre of 2.4 - 3 dtex.
7. Air bag protective cover according to one of claims 1 to 6, wherein the laid down filaments are pre-consolidated prior to the high pressure water jet treatment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2001139227 DE10139227A1 (en) | 2001-08-09 | 2001-08-09 | Airbag Cover |
| DEP10139227.3 | 2001-08-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2394982A1 true CA2394982A1 (en) | 2003-02-09 |
Family
ID=7694962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2394982 Abandoned CA2394982A1 (en) | 2001-08-09 | 2002-07-25 | Air bag protective cover |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1285820A1 (en) |
| CA (1) | CA2394982A1 (en) |
| DE (1) | DE10139227A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10252034B4 (en) * | 2002-11-06 | 2004-12-16 | Johns Manville Europe Gmbh | Airbag Cover |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW246699B (en) * | 1992-10-05 | 1995-05-01 | Unitika Ltd | |
| DE19536603A1 (en) * | 1995-09-30 | 1997-04-03 | Bayerische Motoren Werke Ag | Vehicle air bag restraint and protection system designed for early side expansion |
| DE19739049A1 (en) * | 1997-09-05 | 1999-03-11 | Fleissner Maschf Gmbh Co | Process for producing a hydrodynamically strengthened nonwoven, nonwoven after this production and carrier fleece after this production |
| DE19821848C2 (en) * | 1998-05-15 | 2001-08-23 | Ivo Edward Ruzek | Tufting carrier and process for its manufacture |
| DE10009283C2 (en) * | 2000-02-28 | 2002-02-21 | Freudenberg Carl Kg | Airbag Cover |
-
2001
- 2001-08-09 DE DE2001139227 patent/DE10139227A1/en not_active Withdrawn
-
2002
- 2002-06-19 EP EP02013362A patent/EP1285820A1/en not_active Withdrawn
- 2002-07-25 CA CA 2394982 patent/CA2394982A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE10139227A1 (en) | 2003-03-06 |
| EP1285820A1 (en) | 2003-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |