US5356680A — Industrial fabrics of controlled air permeability…

Claim 1

Independent Claim 82 words

An industrial woven fabric having a controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, and high ageing-resistance, wherein the air permeability does not change by more than 15% from its original value after storage at very high and very low temperatures or after storage at very high and very low atmospheric humidities, and wherein the fabric is made of a yarn having a hot air shrinkage of less than 9% at about 190° C.

Claim 2

Dependent Claim 82 words

An industrial woven fabric having a controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, and high ageing-resistance, wherein the air permeability does not change by more than 15% from its original value after storage at very high and very low temperatures or after storage at very high and very low atmospheric humidities, and wherein the fabric is made of a yarn having a hot air shrinkage of less than 9% at about 190° C.

Claim 3

Dependent Claim 16 words

The fabric according to claim 1, wherein the fabric is made of a synthetic filament yarn.

Claim 4

Dependent Claim 25 words

The fabric according to claim 2, wherein the synthetic filament yarn is a polyamide yarn having a shrinkage of about 2-4% at about 190° C.

Claim 5

Dependent Claim 70 words

An industrial woven fabric having a controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, and high ageing-resistance, wherein the air permeability does not change by more than 15% from its original value after storage at very high and very low temperatures or after storage at very high and very low atmospheric humidities, and wherein the fabric is made of a polyester yarn.

Claim 6

Dependent Claim 70 words

An industrial woven fabric having a controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, and high ageing-resistance, wherein the air permeability does not change by more than 15% from its original value after storage at very high and very low temperatures or after storage at very high and very low atmospheric humidities, and wherein the fabric is made of a polyester yarn.

Claim 7

Dependent Claim 24 words

The fabric according to claim 1, wherein the very high temperature is about 105° C. and the very low temperature is about -35° C.

Claim 8

Dependent Claim 24 words

The fabric according to claim 1, wherein the very high atmospheric humidity is about 95% and the very low atmospheric humidity is about 30%.

Claim 9

Dependent Claim 87 words

An air bag comprised of an industrial woven fabric having a controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, and high ageing-resistance, wherein the air permeability does not change by more than 15% from its original value after storage at very high and very low temperatures or after storage at very high and very low atmospheric humidities, and wherein the fabric is made of a yarn having a hot air shrinkage of less than 9% at about 190° C.

Claim 10

Dependent Claim 87 words

An air bag comprised of an industrial woven fabric having a controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, and high ageing-resistance, wherein the air permeability does not change by more than 15% from its original value after storage at very high and very low temperatures or after storage at very high and very low atmospheric humidities, and wherein the fabric is made of a yarn having a hot air shrinkage of less than 9% at about 190° C.

Claim 11

Dependent Claim 18 words

The air bag according to claim 7, wherein the fabric comprises a filter part of the air bag.

Claim 12

Dependent Claim 27 words

The airbag according to claim 7, wherein the fabric is made of a yarn having a hot air shrinkage of less than 6% at about 90° C.

Claim 13

Dependent Claim 11 words

Air bag system comprising an air bag according to claim 7.

Claim 14

Dependent Claim 27 words

The fabric according to claim 1, wherein the fabric is made of a yarn having a hot air shrinkage of less than 6% of about 190° C.

Claim 15

Dependent Claim 22 words

The fabric according to claim 4, wherein the polyester yarn has a hot air shrinkage of about 1-4% at about 190° C.

Claim 16

Dependent Claim 22 words

The fabric according to claim 4, wherein the polyester yarn has a hot air shrinkage of about 5-9% at about 190° C.

Claim 17

Dependent Claim 24 words

The fabric according to claim 4, wherein the polyester yarn has a tenacity of at least 60 cN/tex and an elongation of about 10-25%.

Claim 18

Dependent Claim 10 words

An airbag comprised of the fabric according to claim 3.

Claim 19

Dependent Claim 10 words

An airbag comprised of the fabric according to claim 12.

Claim 20

Dependent Claim 10 words

An airbag comprised of the fabric according to claim 13.

Claim 21

Dependent Claim 10 words

An airbag comprised of the fabric according to claim 14.

Claim 22

Dependent Claim 116 words

A process for manufacturing industrial fabrics of controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, comprising: subjecting a fabric, made of synthetic filament yarn having a hot air shrinkage adapted to the air permeability to be achieved and having a thread density accurately adapted to yarn linear density and the air permeability to be achieved, to a wet treatment in an aqueous bath at a temperature of 60°-140° C.; then treating the fabric in at least one hot air stage, the last hot air treatment always taking place on a stenter; and then gradually cooling the fabric after the stenter treatment; and winding the fabric with minimal tension.

Claim 23

Dependent Claim 116 words

A process for manufacturing industrial fabrics of controlled air permeability <120 l/dm 2 ×min, measured under a test pressure difference of 500 Pa, comprising: subjecting a fabric, made of synthetic filament yarn having a hot air shrinkage adapted to the air permeability to be achieved and having a thread density accurately adapted to yarn linear density and the air permeability to be achieved, to a wet treatment in an aqueous bath at a temperature of 60°-140° C.; then treating the fabric in at least one hot air stage, the last hot air treatment always taking place on a stenter; and then gradually cooling the fabric after the stenter treatment; and winding the fabric with minimal tension.

Claim 24

Dependent Claim 96 words

The process according to claim 19, wherein the fabric is made of polyamide filament yarn and subjecting the fabric to the wet treatment causes relaxation, further comprising: feeding the fabric into a stenter after wet treatment at an overfeed of 3-5%; drying the fabric in the stenter at a temperature of not more than 150° C.; slowly cooling the fabric without a fan at the stenter outlet; winding up the fabric at minimal tension; and setting drying and cooling conditions in such a way that a moisture content of the fabric is about 5% at wind-up.

Claim 25

Dependent Claim 53 words

The process according to claim 19, wherein the fabric is made of a polyester yarn, and after subjecting the fabric to the wet treatment, the fabric is subsequently dried and set in a stenter at a temperature of about 190° C., gradually cooled after the stenter treatment and wound up with low tension.

Claim 26

Dependent Claim 46 words

The process according to claim 19, further comprising: selecting a type of synthetic filament yarn, having a predetermined yarn linear density, for constructing the fabric; and treating the fabric in the at least one hot air stage according to the type of synthetic filament yarn selected.

Claim 27

Dependent Claim 19 words

The process according to claim 20, further comprising passing the fabric emerging from the stenter over successive floating rolls.

Claim 28

Dependent Claim 23 words

The process of claim 20, wherein the polyamide filament yarn has a hot air shrinkage of less than 9% at about 190° C.

Claim 29

Dependent Claim 23 words

The process of claim 20, wherein the polyamide filament yarn has a hot air shrinkage of less than 6% at about 190° C.

Claim 30

Dependent Claim 22 words

The process of claim 21, wherein the polyester yarn has a hot air shrinkage of less than 10% at about 190° C.

Claim 31

Dependent Claim 18 words

The process of claim 21, wherein the fabric is gradually cooled without a fan after the stenter treatment.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1997-10-17	1998-04-18	1998-10-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2001-10-17	2002-04-18	2002-10-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2005-10-17	2006-04-18	2006-10-18	$7700.00	Window Closed / Lapsed

Industrial fabrics of controlled air permeability and high ageing resistance and manufacture thereof

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