CA1177728A - Thin seat belt webbing and method - Google Patents
Thin seat belt webbing and methodInfo
- Publication number
- CA1177728A CA1177728A CA000399120A CA399120A CA1177728A CA 1177728 A CA1177728 A CA 1177728A CA 000399120 A CA000399120 A CA 000399120A CA 399120 A CA399120 A CA 399120A CA 1177728 A CA1177728 A CA 1177728A
- Authority
- CA
- Canada
- Prior art keywords
- wefts
- woven
- webbing
- weft
- belting
- 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.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D1/00—Woven fabrics designed to make specified articles
- D03D1/0005—Woven fabrics for safety belts
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Woven Fabrics (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
ABSTRACT
THIN SEAT BELT WEBBING AND METHOD
Thinner seat belt webbing than conventional webbing is provided without a decrease in physical proper-ties. The webbing has a weft denier of less than 2/300 dtex or 1/600 dtex, the number of wefts is at least 70 per 10 cm and the warp is at least 2% shorter than the conventional webbing.
THIN SEAT BELT WEBBING AND METHOD
Thinner seat belt webbing than conventional webbing is provided without a decrease in physical proper-ties. The webbing has a weft denier of less than 2/300 dtex or 1/600 dtex, the number of wefts is at least 70 per 10 cm and the warp is at least 2% shorter than the conventional webbing.
Description
~777'~
DESCRIPTION
THIN SEAT BELT WEBBING AND METHOD
BACKGROUND OF THE INVENTION
This invention relates to woven belting for safety belts, preferable with a 2 binding, and to a method for its manufacture.
In the automotive industry, belt systems with belt winders, especially automatic ones, are used to secure the occupants, in regular belt systems such as three-point belts, and also in passive belt systems.
The automotive industry is demanding from the belt system manufacturers the development of smaller and lighter belt winders, especially automatic ones. If the volume and weight of automatic belt winders can be reduced, it will be a contribution towards increased com-fort and improved efficiency of the motor vehicle.
To the producer of safety belt systems, smaller belt winders in conjunction with less weight means pri-marily the development of thinner belting because a belt winder of a volume smaller than that o-f conventional win-ders will allow only the winding up of a shorter length ofbelting of conventional thickness and weight.
Accordingly, it would be desirable to provide woven belting of less thickness while retaining the other belt properties, such as elongation, strength, abrasion properties, etc.
SUMMARY OF THE INVENTION
According to the invention, this problem is li777~
solved in that the weft denier is less than 2/300 dtex or 1/600 dtex; that the number of wefts per 10 cm is at least 70; and that the warp is at least 2~ shorter than that in comparable woven products of greater weft denier and less wefts with the same elongation, scrength and abrasion pro-perties.
In addition, in accordance with this invention there is provided a method for the manufacture of seat belt webbing having warp and weft yarns, characterized by the steps of:
a. employing weft yarns of a denier less than
DESCRIPTION
THIN SEAT BELT WEBBING AND METHOD
BACKGROUND OF THE INVENTION
This invention relates to woven belting for safety belts, preferable with a 2 binding, and to a method for its manufacture.
In the automotive industry, belt systems with belt winders, especially automatic ones, are used to secure the occupants, in regular belt systems such as three-point belts, and also in passive belt systems.
The automotive industry is demanding from the belt system manufacturers the development of smaller and lighter belt winders, especially automatic ones. If the volume and weight of automatic belt winders can be reduced, it will be a contribution towards increased com-fort and improved efficiency of the motor vehicle.
To the producer of safety belt systems, smaller belt winders in conjunction with less weight means pri-marily the development of thinner belting because a belt winder of a volume smaller than that o-f conventional win-ders will allow only the winding up of a shorter length ofbelting of conventional thickness and weight.
Accordingly, it would be desirable to provide woven belting of less thickness while retaining the other belt properties, such as elongation, strength, abrasion properties, etc.
SUMMARY OF THE INVENTION
According to the invention, this problem is li777~
solved in that the weft denier is less than 2/300 dtex or 1/600 dtex; that the number of wefts per 10 cm is at least 70; and that the warp is at least 2~ shorter than that in comparable woven products of greater weft denier and less wefts with the same elongation, scrength and abrasion pro-perties.
In addition, in accordance with this invention there is provided a method for the manufacture of seat belt webbing having warp and weft yarns, characterized by the steps of:
a. employing weft yarns of a denier less than
2/300 dtex or 1/600 dtex, and b. weaving the weft yarns through the warp yarns in such a manner to provide at least 70 weft yarns per 10 cm, the length of the warp yarns in the webbing being at least 2% shorter than in comparable woven webbing of greater weft denier and fewer wefts with the same elonga-tion, strength and abrasion properties.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Given the above problem of creating a practical, thinner belt, it was found that one possible influential factor was a change of the material density per unit of area, i.e. per cm2. One possiblity of reducing the material density per cm2 was reducing the weight of the wefts. The teaching of the invention, namely to make the wefts of the new belting thinner than in conventional belting, was contradicted, first of all, by the disadvan-tage that it causes the seam strength to become too weak.
Another possiblity would have been the reduction of the number of wefts per unit of length. But then, too poor abrasive properties of the finished belt would have had to be expected. Also, the cohesive strength of the belt in transverse direction or, in other words, its transverse strength, would then have become worse.
However, in conjunction with the other features of the teaching of this invention it has been discovered that the wefts can he made thinner than in conventional belts or, in other words, that the weft denier can be 1~777Z8 reduced. This makes it possible, due to the smaller amount of material per unit of area in the belt, to obtain thinner woven belting. ~he unit dtex is expressed in weight per 10,000 m, and it is the known unit of the yarn thickness, here of the weft. The expression 2/300 dtex refers to a needle system in which a yarn of 300 deni~r is inserted twice into one opening in an in and out fashion, whereas the expression 1/600 dtex refers to a shuttle system in which a yarn of 600 denier is inserted once into one opening.
The other measure according to the teaching of the invention and connected with reducing the weft thickness is the increase in the number of wefts per unit of length. This step can be taken without thereby reaching overall a comparable amount of material per cm2 in the belting as in conventional woven products. But the salient advantage resulting therefrom is the improve-ment of the abrasion properties due to the increased number of wefts.
Another measure to solve the problem is the shortening of the warps by 2% compared to the warps of comparable woven products. Comparable woven products are those of conventional type having a weft denier greater than, say, 2/300 dtex and a smaller number of wefts than, say, 70 per 10 cm; while elongation, strength and abra-sion properties of the heavy, thick belting of conven-tional type should be the same as those of the thinner belting according to the invention. A reduction of the warp length compared to warps in known belts is obtainable even when the number of wefts per unit of length is increased over that in conventional belts to improve the seam strength and the abrasion properties of the belt.
Another result of using thinner wefts has been that the crimp of the warps, i.e. their reorientation around the wefts, becomes less, whereby better utilization of the strength of the warps can be obtained to advantage.
For example, assuming a linear load of a warp yarn without crimp to be 100% this strength is reduced to, 72~3 say, 80~ due to the reorientation of the warps around the wefts, as is known. Conse~uently, the better utilization of the linear strength of the warp plays quite a substan-tial role.
While the basic assumption had to be that the weft thickness can possibly be reduced to reduce the thickness of a conventional belt, the general conviction was that the number of warps must not be reduced because an intolerable loss of ultimate strength would otherwise have to be expected. Due to the advantageous effect of the reduced crimp and the better utilization of the linear strength it is possible, according to another expedient feature of the invention, to reduce the number of warps also, in comparison to their number in conventional belts.
It has turned out that while there is a certain increase in the crimp due to the greater number of wefts per unit of length, the crimp still stays low enough to obtain the said better utilization of the strength of the warps.
Thus, it is possible to reduce the number of warps by 5 to 7%, for example, without reducing the strength.
The above measures are by no means a matter of course in woven belting, especially since the high safety factors attained by the conventional belts are prohibited by stringent laws from being jeopardized, and these values are in no way sacrificed by the teaching of the invention, although a thinner belt has been created.
In advantageous further development of the inven-tion, the number of wefts per 10 cm in the new belting ranges between 70 and 85, pre~erably between 73 and 80.
The most expedient values can be adjusted here in adap-tation to the specifications respectively demanded, because numerous parameters play a role; one only has to think of the choice of material for the warps of and wefts, for instance. Basically, the weft denier could be set as small as possible; however, the lower li~it is determined bv the specified seam strength and the abrasion properties.
The above measures also have their effect in 1~77'7Z~
belting types having bindings other than the 2 binding preferentially considered here, for beltings with a 3, 4
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Given the above problem of creating a practical, thinner belt, it was found that one possible influential factor was a change of the material density per unit of area, i.e. per cm2. One possiblity of reducing the material density per cm2 was reducing the weight of the wefts. The teaching of the invention, namely to make the wefts of the new belting thinner than in conventional belting, was contradicted, first of all, by the disadvan-tage that it causes the seam strength to become too weak.
Another possiblity would have been the reduction of the number of wefts per unit of length. But then, too poor abrasive properties of the finished belt would have had to be expected. Also, the cohesive strength of the belt in transverse direction or, in other words, its transverse strength, would then have become worse.
However, in conjunction with the other features of the teaching of this invention it has been discovered that the wefts can he made thinner than in conventional belts or, in other words, that the weft denier can be 1~777Z8 reduced. This makes it possible, due to the smaller amount of material per unit of area in the belt, to obtain thinner woven belting. ~he unit dtex is expressed in weight per 10,000 m, and it is the known unit of the yarn thickness, here of the weft. The expression 2/300 dtex refers to a needle system in which a yarn of 300 deni~r is inserted twice into one opening in an in and out fashion, whereas the expression 1/600 dtex refers to a shuttle system in which a yarn of 600 denier is inserted once into one opening.
The other measure according to the teaching of the invention and connected with reducing the weft thickness is the increase in the number of wefts per unit of length. This step can be taken without thereby reaching overall a comparable amount of material per cm2 in the belting as in conventional woven products. But the salient advantage resulting therefrom is the improve-ment of the abrasion properties due to the increased number of wefts.
Another measure to solve the problem is the shortening of the warps by 2% compared to the warps of comparable woven products. Comparable woven products are those of conventional type having a weft denier greater than, say, 2/300 dtex and a smaller number of wefts than, say, 70 per 10 cm; while elongation, strength and abra-sion properties of the heavy, thick belting of conven-tional type should be the same as those of the thinner belting according to the invention. A reduction of the warp length compared to warps in known belts is obtainable even when the number of wefts per unit of length is increased over that in conventional belts to improve the seam strength and the abrasion properties of the belt.
Another result of using thinner wefts has been that the crimp of the warps, i.e. their reorientation around the wefts, becomes less, whereby better utilization of the strength of the warps can be obtained to advantage.
For example, assuming a linear load of a warp yarn without crimp to be 100% this strength is reduced to, 72~3 say, 80~ due to the reorientation of the warps around the wefts, as is known. Conse~uently, the better utilization of the linear strength of the warp plays quite a substan-tial role.
While the basic assumption had to be that the weft thickness can possibly be reduced to reduce the thickness of a conventional belt, the general conviction was that the number of warps must not be reduced because an intolerable loss of ultimate strength would otherwise have to be expected. Due to the advantageous effect of the reduced crimp and the better utilization of the linear strength it is possible, according to another expedient feature of the invention, to reduce the number of warps also, in comparison to their number in conventional belts.
It has turned out that while there is a certain increase in the crimp due to the greater number of wefts per unit of length, the crimp still stays low enough to obtain the said better utilization of the strength of the warps.
Thus, it is possible to reduce the number of warps by 5 to 7%, for example, without reducing the strength.
The above measures are by no means a matter of course in woven belting, especially since the high safety factors attained by the conventional belts are prohibited by stringent laws from being jeopardized, and these values are in no way sacrificed by the teaching of the invention, although a thinner belt has been created.
In advantageous further development of the inven-tion, the number of wefts per 10 cm in the new belting ranges between 70 and 85, pre~erably between 73 and 80.
The most expedient values can be adjusted here in adap-tation to the specifications respectively demanded, because numerous parameters play a role; one only has to think of the choice of material for the warps of and wefts, for instance. Basically, the weft denier could be set as small as possible; however, the lower li~it is determined bv the specified seam strength and the abrasion properties.
The above measures also have their effect in 1~77'7Z~
belting types having bindings other than the 2 binding preferentially considered here, for beltings with a 3, 4
3 4 or 5 binding may be provided also. Preferably, the yarns are polyester or nylon yarns.
A conventional seat belt has an elongation of e.g. 8 to 10% at a belt thickness (not calendered) of about 1.2 mm. Such a belt weighs 60 g per m at a strength of 2900 daN, and the weft density, i.e. the number of wefts per unit of length, specifically per 10 cm, being 68. The weft denier here of the polyester yarns is 2/550 dtex.
The thinner belt according to the invention has the same elongation, strength and abrasion properties (as the above described conventional belt). However, the thickness of the new belt is (in one embodiment) 1.0 mm, it weighs 52 g per m, its weft density is 79 per lO cm, and its weft denier of the polyester yarns is 2/280 dtex.
The above example clearly demonstrates the impro-vement of the new belting over the conventional belting in regard to thickness and weight, with safety charac-teristics remaining unchanged.
Both belts described above have a 2 binding.
In order to prevent a thinner belt according to the teaching of the invention from being produced and becoming floppy, i.e. too flexible, it may be expedient, in further development of the invention, to have infrared rays act upon the belting to fix it thermally. It is already known that certain technical properties such as elongation, abrasion properties, and flexibility can be imparted to the belting by heat setting. However, this thermal fixation is generally in the form of contact heat or hot air (e.g. 230C). This shrinks, fixes, or stretches the belting by heat setting. But the disadvan-1177';~;Z8 tage of this known thermal fixation is that the tem-perature can be applied mainly to the outer surfaces only of the woven products to be fixed.
Due to the action of infrared rays on the woven belting, complete fixation through and through is obtained to advantage. The infrared rays heat the belt through completely. This makes it possible also for a thin belt, produced by using thinner wefts, for instance, to attain good stiffness or the desired correct flexibility.
A total weight saving of 32 g can be achieved in a specific automatic winder through the measures according to the invention. This figure demonstrates the advantages of a belt winder with the new woven belt.
Other advantages, features and possible applica-tions of the present invention follow from the descriptionbelow in connection with the drawings in which Fig. 1 shows, in transverse section and greatly enlarged, a por-tion of a woven seat belt according to a conventional system, and Fig. 2 shows a view similar to that of Fig. 1, but with thinner wefts and, hence, a thinner belt overall.
The known type of weaving according to Fig. 1 as well as the new one according to Fig. 2 has a 2 binding.
According to this binding, the warp 1 is severely crimped around the wefts 2. The use of these relatively thick yarns results in an uncalendered thickness of the known belt of D = 1.25 mm approx.
The wefts 3 of the new belt according to Fig. 2 are thinner so that the warps 4 and the weEts 3 are inter-woven with less crimp so that the resultant total uncalen-dered belt thickness is d = 1.00 approx.
A conventional seat belt has an elongation of e.g. 8 to 10% at a belt thickness (not calendered) of about 1.2 mm. Such a belt weighs 60 g per m at a strength of 2900 daN, and the weft density, i.e. the number of wefts per unit of length, specifically per 10 cm, being 68. The weft denier here of the polyester yarns is 2/550 dtex.
The thinner belt according to the invention has the same elongation, strength and abrasion properties (as the above described conventional belt). However, the thickness of the new belt is (in one embodiment) 1.0 mm, it weighs 52 g per m, its weft density is 79 per lO cm, and its weft denier of the polyester yarns is 2/280 dtex.
The above example clearly demonstrates the impro-vement of the new belting over the conventional belting in regard to thickness and weight, with safety charac-teristics remaining unchanged.
Both belts described above have a 2 binding.
In order to prevent a thinner belt according to the teaching of the invention from being produced and becoming floppy, i.e. too flexible, it may be expedient, in further development of the invention, to have infrared rays act upon the belting to fix it thermally. It is already known that certain technical properties such as elongation, abrasion properties, and flexibility can be imparted to the belting by heat setting. However, this thermal fixation is generally in the form of contact heat or hot air (e.g. 230C). This shrinks, fixes, or stretches the belting by heat setting. But the disadvan-1177';~;Z8 tage of this known thermal fixation is that the tem-perature can be applied mainly to the outer surfaces only of the woven products to be fixed.
Due to the action of infrared rays on the woven belting, complete fixation through and through is obtained to advantage. The infrared rays heat the belt through completely. This makes it possible also for a thin belt, produced by using thinner wefts, for instance, to attain good stiffness or the desired correct flexibility.
A total weight saving of 32 g can be achieved in a specific automatic winder through the measures according to the invention. This figure demonstrates the advantages of a belt winder with the new woven belt.
Other advantages, features and possible applica-tions of the present invention follow from the descriptionbelow in connection with the drawings in which Fig. 1 shows, in transverse section and greatly enlarged, a por-tion of a woven seat belt according to a conventional system, and Fig. 2 shows a view similar to that of Fig. 1, but with thinner wefts and, hence, a thinner belt overall.
The known type of weaving according to Fig. 1 as well as the new one according to Fig. 2 has a 2 binding.
According to this binding, the warp 1 is severely crimped around the wefts 2. The use of these relatively thick yarns results in an uncalendered thickness of the known belt of D = 1.25 mm approx.
The wefts 3 of the new belt according to Fig. 2 are thinner so that the warps 4 and the weEts 3 are inter-woven with less crimp so that the resultant total uncalen-dered belt thickness is d = 1.00 approx.
Claims (6)
1. Woven belting for safety belts, characterized in that the weft denier is less than 2/300 dtex or 1/600 dtex; that the number of wefts is at least 70 per 10 cm;
and that the warp is at least 2% shorter than in com-parable woven products of greater weft denier and fewer wefts with the same elongation, strength and abrasion pro-perties.
and that the warp is at least 2% shorter than in com-parable woven products of greater weft denier and fewer wefts with the same elongation, strength and abrasion pro-perties.
2. Woven belting according to claim 1, charac-terized in that the number of wefts per 10 cm ranges from 70 to 85.
3. Woven belting according to claim 2, charac-terized in that the number of wefts per 10 cm is from 73 to 80.
4. Woven belting according to claim 1, charac-terized in that the belting has a 2 binding.
5. Method for the manufacture of woven seat belt webbing having warp and weft yarns, characterized by the steps of:
(a) employing weft yarns of a denier less than 2/300 dtex or 1/600 dtex, and (b) weaving said weft yarns through said warp yarns in such a manner to provide at least 70 weft yarns per 10 cm, the length of said warp yarns in said webbing being at least 2% shorter than in comparable woven webbing of greater weft denier and fewer wefts with the same elongation, strength and abrasion pro-perties.
(a) employing weft yarns of a denier less than 2/300 dtex or 1/600 dtex, and (b) weaving said weft yarns through said warp yarns in such a manner to provide at least 70 weft yarns per 10 cm, the length of said warp yarns in said webbing being at least 2% shorter than in comparable woven webbing of greater weft denier and fewer wefts with the same elongation, strength and abrasion pro-perties.
6. The method according to claim 5, including the step of thermally fixing said webbing by the action of infrared radiation, whereby said webbing is fixed throughout its thickness.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813113701 DE3113701A1 (en) | 1981-04-04 | 1981-04-04 | WOVEN STRAP AND METHOD FOR PRODUCING THE SAME |
| DEP3113701.6 | 1981-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1177728A true CA1177728A (en) | 1984-11-13 |
Family
ID=6129388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000399120A Expired CA1177728A (en) | 1981-04-04 | 1982-03-23 | Thin seat belt webbing and method |
Country Status (8)
| Country | Link |
|---|---|
| CA (1) | CA1177728A (en) |
| DE (1) | DE3113701A1 (en) |
| FI (1) | FI820612L (en) |
| FR (1) | FR2503197A1 (en) |
| GB (1) | GB2096189A (en) |
| IT (1) | IT8267418A0 (en) |
| NL (1) | NL8201305A (en) |
| SE (1) | SE8201862L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013210274B4 (en) * | 2013-06-03 | 2014-12-18 | Berger Gmbh & Co. Holding Kg | Fine-thread safety belt webbing and method for producing such a seat belt webbing |
| DE102014222654B4 (en) * | 2014-11-06 | 2022-08-25 | Autoliv Development Ab | Webbing for a seat belt device and seat belt device |
-
1981
- 1981-04-04 DE DE19813113701 patent/DE3113701A1/en not_active Withdrawn
-
1982
- 1982-02-24 FI FI820612A patent/FI820612L/en not_active Application Discontinuation
- 1982-03-04 GB GB8206340A patent/GB2096189A/en not_active Withdrawn
- 1982-03-15 FR FR8204338A patent/FR2503197A1/en not_active Withdrawn
- 1982-03-23 CA CA000399120A patent/CA1177728A/en not_active Expired
- 1982-03-24 SE SE8201862A patent/SE8201862L/en not_active Application Discontinuation
- 1982-03-30 IT IT8267418A patent/IT8267418A0/en unknown
- 1982-03-30 NL NL8201305A patent/NL8201305A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE8201862L (en) | 1982-10-05 |
| GB2096189A (en) | 1982-10-13 |
| IT8267418A0 (en) | 1982-03-30 |
| NL8201305A (en) | 1982-11-01 |
| FI820612L (en) | 1982-10-05 |
| DE3113701A1 (en) | 1982-10-21 |
| FR2503197A1 (en) | 1982-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |