PatentDe  


Dokumentenidentifikation EP1468878 19.10.2006
EP-Veröffentlichungsnummer 0001468878
Titel Herstellungsverfahren einer Abdeckung für eine Gassackvorrichtung, Gassackvorrichtung und Fahrzeug-Innenverkleidung
Anmelder Takata Corp., Tokio/Tokyo, JP
Erfinder Hayashi, Shinji, Tokyo 106-8510, JP;
Morita, Masaru, Tokyo 106-8510, JP
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 602004002227
Vertragsstaaten DE, FR, GB, SE
Sprache des Dokument EN
EP-Anmeldetag 19.03.2004
EP-Aktenzeichen 040066961
EP-Offenlegungsdatum 20.10.2004
EP date of grant 06.09.2006
Veröffentlichungstag im Patentblatt 19.10.2006
IPC-Hauptklasse B60R 21/20(2000.01)A, F, I, 20040903, B, H, EP

Beschreibung[en]

The present invention relates to a method of manufacturing a cover component respectively, a vehicle interior trim.

The closest prior art is US-A-6 113 131 describing : A method of manufacturing a cover component or instrument panel for an airbag system, the cover component having a tear line that is torn open when an airbag of the airbag system inflates, the method comprising the steps of

  • forming a recessed line at least in a part of the tear line;
  • boring hollows in the recessed line at intervals by laser processing.

Said prior art starts from JP-A-6-25059 in which a notch is formed by use of a molding process whereby a mold member is incorporated in a core of the molding die, thereby forming the notch. The process used in said JP - document should not be used for the embodiments of US-A-6 113 131.

Cover components for airbag systems mounted to highspeed movable bodies such as automobiles include a folded airbag, a gas supply means for inflating the airbag, and a cover component for covering the folded airbag. The cover component is sometimes referred to as a module cover, a lid, a deployment door and so on.

An instrument panel itself in place of the cover component is sometimes provided with a tear line.

The cover component and the instrument panel are manufactured by molding a synthetic resin material with a die. On the surface of the cover component and the instrument panel, leather, felt or the like is sometimes integrally formed.

One type of the cover component and the instrument panel has a tear line (brittle linear part) which is torn open by the pressure of an airbag when the airbag inflates to thereby open the cover component or the instrument panel.

The tear line is generally formed with a raised line provided on the core surface of a die for molding the cover component or the instrument panel. When the core surface has the raised line, a recessed line corresponding to the raised line is formed in the molded cover component. Another method for forming the tear line is described in Japanese Unexamined Patent Application Publication No. 8-282420, in which a recess or a recessed line is formed by exposing a cover component to a laser beam. Fig. 8 of the gazette shows a tear line formed of an even-depth recessed line. Fig. 20 of the gazette shows a tear line having hollows at intervals in a recessed line. In the gazette, both the recessed line and the hollows in Fig. 20 are formed with a laser beam.

When the recessed line and the hollows as in Fig. 20 of the above-mentioned Japanese Unexamined Patent Application Publication No. 8-282420 are formed by a laser processing method by which recesses are formed by exposure to a laser beam, cycle change of laser output is a possible approach. More specifically, an increase in laser output will increase the depth of the recess while a decrease in laser output will decrease the depth of the recess.

However, when the recessed line is formed in a specified depth by laser light as described above, the relative speed between the laser output and the movement of the cover component, or the workpiece must be strictly controlled and the time for laser processing is increased.

It is an object of the present invention to provide, i.e. to manufacture, a cover component and a vehicle interior trim which have a tear line formed of a specified-depth recessed line and hollows and which are easy to manufacture and an airbag system including the cover component.

According to the present invention, this object is achieved by the measures of claim 1 and claim 7, respectively. Further details are outlined in the dependent claims.

The cover component of an airbag system according to the present invention is mounted to an airbag system and has a tear line that is torn open when an airbag of the airbag system inflates. At least part of the tear line includes a recessed line and hollows bored in the recessed line at intervals; the recessed line is formed with a raised line provided on the core surface of a die when the cover component is molded; and the hollows are bored by laser processing.

The airbag system of the invention includes the cover component of the invention.

The vehicle interior trim according to the invention has a tear line that is torn open when an airbag of an airbag system inflates. At least part of the tear line includes a recessed line and hollows bored in the recessed line at intervals; the recessed line is formed with a raised line provided on the core surface of a die when the cover component is molded; and the hollows are bored by laser processing. The vehicle interior trim is preferably an instrument panel or, alternatively, it may be a door trim.

The cover component of the airbag system and the vehicle interior trim according to the invention can easily be manufactured since the recessed line is formed by molding and only the hollows are formed by laser processing.

In the cover component of the airbag system and the vehicle interior trim according to the invention, the recessed line at the end of the tear line may decrease in depth gradually toward the endmost of the tear line. This structure prevents a tear-over phenomenon that the cover component is torn open excessively to stop the tearing at the end of the tear line.

In the cover component of the airbag system and the vehicle interior trim according to the invention, the part of the tear line to start the tearing may have a strength lower than that of the other part. Providing the low-strength part allows the tearing to start from a specified position.

In order that the part to start the tearing has low strength, the recessed line of the part is preferably deeper than the other part. The part to start the tearing may be formed of a recessed line and hollows and the other part may be formed of a recessed line. As described above, the recessed line is formed with a raised line on the core surface of a die and the hollows are formed by laser processing.

The present invention provides a cover component and a vehicle interior trim in which at least part of a tear line includes a specified-depth recessed line and hollows and which is easy to manufacture. According to the invention, the tear line can be torn open from a specified position.

Embodiments of the present invention will be described hereinafter with reference to the drawings.

  • Fig. 1 is a front view of a cover component of an airbag system according to an embodiment.
  • Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1.
  • Fig. 3 is a cross-sectional view taken along line III-III of Fig. 2.
  • Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 1.
  • Fig. 5 is an explanatory diagram of another embodiment.
  • Fig. 6 is a cross-sectional view of yet another embodiment.
  • Fig. 7 is a cross-sectional view of still another embodiment.
  • Fig. 8 is a cross-sectional view of a further embodiment.
  • Fig. 9 is a cross-sectional view of another embodiment.
  • Fig. 10 is a cross-sectional view of another embodiment.
  • Fig. 11 is a cross-sectional view of another embodiment.
  • Fig. 12 is a cross-sectional view of yet another embodiment.

Fig. 1 is a front view of a cover component 1 of an airbag system according to an embodiment. Although the cover component according to the embodiment concerns a lid of a front-passenger-seat airbag system, the cover component of the invention can also be applied to various airbag systems such as a driver-seat airbag system, a rear-seat airbag system, and a side airbag system.

The cover component 1 according to the embodiment is formed of a synthetic resin by injection molding. The cover component is mounted to an instrument panel in front of a front passenger seat. The front-passenger-seat airbag system includes a front-open container, a folded airbag housed in the container, a gas generator for inflating the airbag, and the cover component covering the front opening of the container, which are not shown in the drawing. On the back of the cover component is provided a joining piece for joining the cover component to the container.

The cover component 1 has a tear line 2 for partially opening the cover component 1 by the pressure of the airbag when the airbag inflates. In this embodiment, the tear line extends in H-shape, viewed from a vehicle guide side; however, it may extend in another shape such as U-shape.

The tear line 2 is formed of a recessed line 2a and hollows 2b arranged along the recessed line 2a at specified intervals. The recessed line 2a is formed by providing a raised line on the core surface of a die when the cover component 1 is formed with the die. The hollows 2b are bored by irradiation with a laser beam. The depth and width of the recessed line 2a and the hollows 2b and the arrangement (pitch) of the hollows 2b are appropriately determined in consideration of the material and the size of the cover component 1 and the pressure generated from the gas generator.

In this embodiment, the recessed line 2a is decreased in depth at the end, as shown in Fig. 4. In this embodiment, the bottom near the end of the recessed line 2a forms a slope 2c about 30° to 60° inclined relative to the back of the cover component 1. The slope 2c is also formed with the raised line provided on the core surface of the die.

In the cover component 1 with such a structure, since it is only the hollows 2b that is formed by laser processing, it takes only a short time for laser processing. Since the hollows 2b have only to be formed in a uniform depth by laser processing, the output of the laser can be controlled simply by on-off control, so that it is easy to control. Accordingly, the cover component 1 is very easy to manufacture.

Since the recessed line 2a is formed by molding, its depth is of high accuracy and agrees with a designed depth, and also the surface roughness of the bottom of the recessed line 2a corresponds to the raised line of the core surface, thus having a designed value.

Particularly, in this embodiment, since the recessed line 2a at the end of the tear line is gradually decreased in depth toward the endmost of the tear line 2, the cover component 1 can be surely torn open along the tear line 2 at the end.

More specifically, as the tearing that has advanced along the tear line 2 has come near the slope 2c at the end, the cover component 1 increases in thickness gradually to absorb tearing energy gradually and stop the tearing in the region of the slope 2c at which the depth decreases gradually. Even if the tearing has overshot the endmost of the tear line 2, it stops with slight tearing from the endmost since the tearing momentum has been decreased extremely, so that the end of the tearing is near the endmost of the tear line 2.

Fig. 5(a) is a front view of a cover component 11 according to another embodiment; and Fig. 5(b) is a cross-sectional view taken along line B-B of Fig. 5(a).

A tear line 12 of the cover component 11 is also in H-shape having a pair of left and right vertical lines and a lateral line connecting them as is the tear line 2; however, it may be in U-shape.

The tear line 12 is formed of the recessed line 2a and the hollows 2b arranged along the recessed line 2a at specified intervals, as is the tear line 2. The recessed line 2a is formed by providing a raised line on the core surface of a die when the cover component 11 is formed with the die. The hollows 2b are bored by irradiation with a laser beam.

The vicinity of the middle of the length of the lateral part of the tear line 12 is lower in strength than the other part, from which the tearing of the tear line 12 starts.

In this embodiment, inclined parts 13 and 13 are provided in the adjacent part to a hollow 2B positioned in the vicinity of the middle, in which the recessed line 2a increases in depth at the hollow 2B. The inclined parts 13 and 13 are also formed with the raised line on the core surface of the die, as is the recessed line 2a.

The ceiling surface (deepmost surface) of the hollow 2B is deeper than the ceiling surface of the other hollows 2b, thus positioned close to the front surface of the cover component 11.

The raised line of the die core surface has a small trapezoidal salient with parts overlapping with the inclined parts 13 and 13 as a pair of oblique lines. A small recessed part formed with the small salient is irradiated with a laser beam at the same intensity as that for forming the hollows 2b, so that the hollow 2B deeper than the other hollows 2b is formed.

The ceiling surface of the hollow 2B may be in the same position as those of the other hollows 2b.

The cover component 11 with such a structure starts to be surely torn open from the vicinity of the middle of the tear line 12.

Referring to Fig. 6, steps 23 and 23 are provided in the adjacent part to the hollow 2B in the vicinity of the middle of a tear line 22 (neighboring parts along the length of the tear line 22) in order to start tearing. The steps 23 and 23 connect to the hollow 2B. The ceiling surface of the hollow 2B is closer to the front surface of a cover component 21 than those of the other hollows 2b; however, it may be the same.

The other structures of the cover component 21 are the same as those of the cover component 11.

A cover component 31 in Fig. 7 has three hollows 2B in the middle of a tear line 32 in the proximity to one another to provide low strength to start tearing. The size and depth of the hollows 2B are the same as those of the hollows 2b. The other structures of the cover component 31 are the same as those of the cover component 1.

Also the cover components 21 and 31 in Figs. 6 and 7 surely start to be torn open from the hollow 2B.

In Figs. 5 and 6, although one hollow 2B in the middle has the inclined parts 13 and the steps 23, respectively, two or more hollows in the middle may have the similar inclined parts and steps. Although the steps 23 each have one step, they may be multisteps of two or more.

Although the three hollows 2B are arranged in proximity in Fig. 7, two or more than four hollows may be arrange in proximity.

Figs. 8 to 12 show other structures in which tearing start positions are made easier to be torn open than the other parts. Figs. 8(a) and 9(a) are cross-sectional views taken along the respective tear lines and Figs. 8(b) and 8(c) and Figs. 9(b) and 9(c) are cross-sectional views taken along line B-B and line C-C of Figs. 8(a) and 9(a), respectively.

Cover components 41 and 51 in Figs. 8 and 9, respectively, are the same as the above-described cover components in that respective tear lines 42 and 52 are composed of the recessed line 2a formed with a die and hollows 2b formed by laser processing. The tear lines 42 and 52 have the recessed line 2a deep in the part to start tearing. Reference numerals 43 and 53 denote deep recessed parts.

Referring to Fig. 8, the hollows 2b including the deep recessed part 43 have substantially the same depth.

Referring to Fig. 9, all the deepmost surfaces of the hollows 2b have substantially the same level. In other words, the distances between the deepmost surfaces of the hollows 2b and the front surface (the top) of the cover component 51 are substantially the same.

The deepmost parts 43 and 53 are formed with a die, along with the recessed line 2a.

Referring to Fig. 10, also the hollows 2b of a tear line 62 of a cover component 61 are substantially at the same level at the deepmost surfaces. The tear line 62 is different from the tear line 52 in that the recessed line 2a has a slightly deep part 63 and a deepmost part 64 in the middle of the slightly deep part 63 along the length of the tear line 62. Although the deep parts 63 and 64 are provided in two steps in Fig. 10, they may be in three steps or more.

A cover component 71 in Fig. 11 is the same as the above-described cover components in that a tear line 72 is composed of the recessed line 2a and the hollows 2b. In the cover component 71, a deep part 73 provided in the position of the recessed line 2a to start tearing decreases in depth gradually at a deepmost part 73a in the middle of the length of the tear line 72. The tearing is started from the deepmost part 73a or from the vicinity of the hollows 2b adjacent thereto.

The levels of the deepmost surfaces of the hollows 2b are substantially equal.

In a cover component 81 in Fig. 12, the greater part of a tear line 82 is formed of only the hollows 2b. The tear line 82 is formed of a recessed line 83 and the hollows 2b only at the part to start tearing.

The hollows 2b are formed by laser processing, which are formed in column at regular intervals. The deepmost surfaces of the hollows 2b have substantially the same level. The part to start tearing has the hollows 2b bored from the bottom of the recessed line 83. The recessed line 83 is formed with a die.

Examples of the synthetic resin for constructing the cover components include a styrene and/or ethylene based thermoplastic elastomer (TPE) and polypropylene. The styrene based TPE is a compound material containing a styrene-conjugated diene block polymer and its hydrogenated block polymer as the base, to which components selected from thermoplastic resins such as an olefinic resin and a styrene resin, various rubber softeners such as a petroleum-hydrocarbon-rubber softener (oil, etc.) and a synthetic softener (polybutene, etc.), inorganic fillers, waxes, and various additives are compounded.

An olefinic TPE is a compound material containing a copolymer rubber made from ethylene and C3 to C6 alpha olefin and a soft polymer as the base, to which components selected from various resins, softeners, inorganic fillers, waxes, various additives similar to those of the styrene TPE are compounded.

For the ethylene-alpha olefin conjugated diene rubber, a certain quantity of diene components such as dicyclopentadiene and ethylidene norbornane are copolymerized may be used. The alpha olefins that use C3: propylene and C4: butane-1 are widely on the market, which are preferable in terms of performance and cost.

The cover components of the invention may be made from other components.

Although the above-described embodiments relate to cover components, the invention may also be applied to an instrument panel with a tear line. The invention can also be applied to vehicle' interior trims other than the instrument panel, such as a door trim which implements a side airbag system and a roof-side trim which implements a head-protection airbag system.


Anspruch[de]
Verfahren zur Herstellung einer Abdeckungskomponente für ein Airbagsystem,

wobei die Abdeckungskomponente eine Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82) aufweist, welche aufreißt, wenn ein Airbag des Airbagsystems aufgeblasen wird,

das Verfahren umfasst die Schritte Ausbilden einer vertieften Linie (2a; 83) zumindest in einem Teil der Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82), indem eine erhöhte Linie verwendet wird, welche auf einer Kernoberfläche eines Formwerkzeugs vorhanden ist, wenn die Abdeckungskomponente ausgeformt wird; und Bohren von Vertiefungen (2b; 2B) in die vertiefte Linie (2a; 83) in Abständen durch ein Laserverfahren.
Verfahren nach Anspruch 1, wobei die vertiefte Linie (2a; 83) allmählich in der Tiefe zu dem letzten Ende der Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82) hin an dem Ende der Risslinie abnimmt. Verfahren nach Anspruch 1 oder 2, wobei der Teil (2B; 43; 53; 63, 64; 73; 83) der Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82), um mit dem Reißen zu beginnen, eine Festigkeit aufweist, welche geringer als diejenige des anderen Teils ist. Verfahren nach Anspruch 3, wobei der Teil (43; 53; 63, 64; 73), um mit dem Reißen zu beginnen, die vertiefte Linie (2a) und Vertiefungen (2b) aufweist und

wobei der Teil, um mit dem Reißen zu beginnen, tiefer als der andere Teil ist.
Verfahren nach Anspruch 3, wobei der Teil, um mit dem Reißen zu beginnen, die vertiefte Linie (83) und Vertiefungen (2b) aufweist und wobei die andere Risslinie (82) mit Vertiefungen (2b) ausgebildet ist. Verfahren zur Herstellung eines Airbagsystems, die Schritte umfassend Herstellen einer Abdeckungskomponente für das Airbagsystem gemäß einem der Ansprüche 1-5; und Montieren der Abdeckungskomponente mit einem gefalteten Airbag und einem Gasgenerator zum Aufblasen des Airbags, um derart das Airbagsystem auszubilden. Verfahren zur Herstellung einer inneren Fahrzeugverkleidung, wobei die innere Fahrzeugverkleidung eine Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82) aufweist, welche aufreißt, wenn ein Airbag eines Airbagsystems aufgeblasen wird,

das Verfahren umfasst die Schritte Ausbilden einer vertieften Linie (2a; 83) zumindest in einem Teil der Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82), indem eine erhöhte Linie verwendet wird, welche auf einer Kernoberfläche eines Formwerkzeugs vorhanden ist, wenn die innere Fahrzeugverkleidung ausgeformt wird; und Bohren von Vertiefungen (2b; 2B) in die vertiefte Linie (2a; 83) in Abständen durch ein Laserverfahren.
Verfahren nach Anspruch 7, wobei die vertiefte Linie (2a; 83) allmählich in der Tiefe zu dem letzten Ende der Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82) hin an dem Ende der Risslinie abnimmt. Verfahren nach Anspruch 7 oder 8, wobei der Teil (2B; 43; 53; 63, 64; 73; 83) der Risslinie (2; 12; 22; 32; 42; 52; 62; 72; 82), um mit dem Reißen zu beginnen, eine Festigkeit aufweist, welche geringer als diejenige des anderen Teils ist. Verfahren nach Anspruch 9, wobei der Teil (43; 53; 63, 64; 73), um mit dem Reißen zu beginnen, die vertiefte Linie (2a) und Vertiefungen (2b) aufweist und wobei der Teil, um mit dem Reißen zu beginnen, tiefer als der andere Teil ist. Verfahren nach Anspruch 9, wobei der Teil, um mit dem Reißen zu beginnen, die vertiefte Linie (83) und Vertiefungen (2b) aufweist und wobei die andere Risslinie (82) aus Vertiefungen (2b) ausgebildet ist. Verfahren nach einem der Ansprüche 7 bis 11, wobei die innere Fahrzeugverkleidung ein Armaturenbrett ist.
Anspruch[en]
A method of manufacturing a cover component for an airbag system,

the cover component having a tear line (2; 12; 22; 32; 42; 52; 62; 72; 82) that is torn open when an airbag of the airbag system inflates,

the method comprising the steps of forming a recessed line (2a; 83) at least in a part of the tear line (2; 12; 22; 32; 42; 52; 62; 72; 82) by using a raised line provided on a core surface of a die when the cover component is molded; and boring hollows (2b; 2B) in the recessed line (2a; 83) at intervals by laser processing.
A method according to claim 1, wherein the recessed line (2a; 83) decreases in depth gradually toward the endmost of the tear line (2; 12; 22; 32; 42; 52; 62; 72; 82) at the end of the tear line. A method according to claim 1 or 2, wherein the part (2B; 43; 53; 63, 64; 73; 83) of the tear line (12; 22; 32; 42; 52; 62; 72; 82) to start the tearing has a strength lower than that of the other part. A method according to claim 3, wherein the part (43; 53; 63, 64; 73) to start the tearing includes said recessed line (2a) and hollows (2b) and wherein the part to start the tearing is deeper than the other part. A method according to claim 3, wherein the part to start the tearing includes said recessed line (83) and hollows (2b) and wherein the other tear line (82) is formed of hollows (2b). A method of manufacturing an airbag system, comprising the steps of manufacturing a cover component for the airbag system according to any one of claims 1-5; and assembling the cover component with a folded airbag and a gas generator for inflating the airbag so as to form the airbag system. A method of manufacturing a vehicle interior trim, the vehicle interior trim having a tear line (2; 12, 22; 32; 42; 52; 62; 72; 82) that is torn open when an airbag of an airbag system inflates,

the method comprising the steps of forming a recessed line (2a; 83) in at least a part of the tear line (2; 12; 22; 32; 42; 52; 62; 72; 82) by using a raised line provided on a core surface of a die when the vehicle interior trim is molded; and boring hollows (2b; 2B) in the recessed line (2a; 83) at intervals by laser processing.
A method according to claim 7, wherein the recessed line (2a; 83) decreases in depth gradually toward the endmost of the tear line (2; 12; 22; 32; 42; 52; 62; 72; 82) at the end of the tear line. A method according to claim 7 or 8, wherein the part (2B; 43; 53; 63, 64; 73; 83) of the tear line (12; 22; 32; 42; 52; 62; 72; 82) to start the tearing has a strength lower than that of the other part. A method according to claim 9, wherein the part (43; 53; 63, 64; 73) to start the tearing includes said recessed line (2a) and hollows (2b) and wherein the part to start the tearing is deeper than the other part. A method according to claim 10, wherein the part to start the tearing includes said recessed line (83) and hollows (2b) and wherein the other tear line (82) is formed of hollows (2b). A method according to any one of claims 7 to 11, wherein the vehicle interior trim is an instrument panel.
Anspruch[fr]
Un procédé de fabrication d'un composant de couvercle pour un système de coussin de sécurité gonflable ou air-bag: - le composant de couvercle ayant une ligne de déchirement (2; 12; 22; 32; 42; 52; 62; 72; 82), qui s'ouvre en se déchirant lorsqu'un coussin de sécurité gonflable du système de coussin de sécurité gonflable se gonfle, le procédé comprenant les étapes consistant à: - former une ligne en creux (2a; 83) dans au moins une partie de la ligne de déchirement (2; 12; 22; 32; 42; 52; 62; 72; 82) en utilisant une ligne surélevée prévue sur une surface de noyau d'un modèle lorsque le composant de couvercle est moulé; et - former des creux (2b; 2B) dans la ligne en creux (2a; 83) par intervalles, par traitement laser. Un procédé selon la revendication 1, dans lequel la ligne en creux (2a; 83) décroît graduellement en profondeur vers l'extrémité de la ligne de déchirement (2; 12; 22; 32; 42; 52; 62; 72; 82), à l'extrémité de la ligne de déchirement. Un procédé selon la revendication 1 ou 2, dans lequel la partie (2B; 43; 53; 63; 64; 73; 83) de la ligne de déchirement (12; 22; 32; 42; 52; 62; 72; 82) qui commence le déchirement présente une résistance plus faible que celle de l'autre partie. Un procédé selon la revendication 3, dans lequel la partie (43; 53; 63; 64; 73) qui commence le déchirement comprend ladite ligne en creux (2a) et des creux (2b), et dans lequel la partie qui commence le déchirement est plus profonde que l'autre partie. Un procédé selon la revendication 3, dans lequel la partie qui commence le déchirement comprend ladite ligne en creux (83) et des creux (2b), et dans lequel l'autre ligne de déchirement (82) est formée de creux (2b). Un procédé de fabrication d'un système de coussin de sécurité gonflable, comprenant les étapes consistant à: - fabriquer un composant de couvercle pour le système de coussin de sécurité gonflable selon l'une quelconque des revendications 1 à 5; et - assembler le composant de couvercle avec un coussin de sécurité gonflable plié et un générateur de gaz pour gonfler le coussin de sécurité gonflable, de façon à former le système de coussin de sécurité gonflable. Un procédé de fabrication d'un habillage intérieur de véhicule, l'habillage intérieur de véhicule ayant une ligne de déchirement (2; 12; 22; 32; 42; 52; 62; 72; 82) qui s'ouvre en se déchirant lorsqu'un coussin de sécurité gonflable d'un système de coussin de sécurité gonflable se gonfle, le procédé comprenant les étapes consistant à: - former une ligne en creux (2a; 83) dans au moins une partie de la ligne de déchirement (2; 12; 22; 32; 42; 52; 62; 72; 82), en utilisant une ligne surélevée prévue sur une surface de noyau d'un modèle lorsque l'habillage intérieur de véhicule est moulé; et - former des creux (2b; 2B) dans la ligne en creux (2a; 83) par intervalles, par traitement laser. Un procédé selon la revendication 7, dans lequel la ligne en creux (2a; 83) décroît graduellement en profondeur vers l'extrémité de la ligne de déchirement (2; 12; 22; 32; 42; 52; 62; 72; 82), à l'extrémité de la ligne de déchirement. Un procédé selon la revendication 7 ou 8, dans lequel la partie (2B; 43; 53; 63; 64; 73; 83) de la ligne de déchirement (12; 22; 32; 42; 52; 62; 72; 82) pour commencer le déchirement présente une résistance plus faible que celle de l'autre partie. Un procédé selon la revendication 9, dans lequel la partie (43; 53; 63; 64; 73) pour commencer le déchirement comprend ladite ligne en creux (2a) et des creux (2b), et dans lequel la partie pour commencer le déchirement est plus profonde que l'autre partie. Un procédé selon la revendication 10, dans lequel la partie pour commencer le déchirement comprend ladite ligne en creux (83) et des creux (2b), et dans lequel l'autre ligne de déchirement (82) est formée de creux (2b). Un procédé selon l'un quelconque des revendications 7 à 11, dans lequel l'habillage intérieur de véhicule est un tableau de bord.






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