KR102639632B1 - Bielastic fabric and manufacturing method thereof - Google Patents

Abstract

Bielastic fabrics comprising biopolyamide yarns and elastane yarns with excellent elastic properties and high dimensional stability and a cost-effective and efficient method for obtaining the same are described.

Description

Bielastic fabric and manufacturing method thereof

The present invention relates to bielastic fabrics comprising biopolyamide yarns and elastane yarns with excellent elastic properties and high dimensional stability, as well as cost-effective and efficient methods for obtaining them.

Environmental impact issues associated with the textile industry, particularly water and air emissions and water and energy use, are known and are of recent interest.

Therefore, being able to produce textile and clothing products with reduced energy consumption and environmental impact, without compromising the technical characteristics of the products themselves, is an important goal.

Therefore, the purpose of the present invention is to provide a solution to this problem that can simultaneously achieve excellent quality and technical performance.

Summary of the Invention

The above object is achieved by the dual elastic fabric claimed in claim 1 of the present application.

In another aspect, the present invention relates to a method for obtaining such dual elastic fabrics.

In another aspect, the invention relates to an article of clothing or furniture made at least in part from such a bi-elastic fabric.

DETAILED DESCRIPTION OF THE INVENTION

Accordingly, the present invention relates to a bi-elastic fabric comprising biopolyamide yarns and elastane yarns.

The term "bielastic" means that the fabric is elastic in the warp and weft directions.

The term “biopolyamide” refers to a polyamide that is wholly or partly of plant origin.

Preferably, the biomass from which the biopolyamides for the purposes of the present invention are derived are castor seeds, referred to as " Ricinus Communis ". The monomers used in the polymerization process are partially or completely derived from castor oil.

Biopolyamides exhibit high resistance to chemical agents, especially hydrocarbons, dimensional stability, relatively low density and good processability.

Preferably, the biopolyamide is Biopolyamide 6, Biopolyamide 6.6, Biopolyamide 6.10, Biopolyamide 6.12, Biopolyamide 11, Biopolyamide 12, or mixtures thereof.

More preferably, the biopolyamide is biopolyamide 6.6.

In an embodiment, the biopolyamide yarn has a count of 10 to 200 dTex, preferably 20 to 150 dTex.

“Elastane” refers to a synthetic fiber of polyurethane, also known as Spandex or Lycra.

Currently, polyurethanes are generally produced from raw materials. The reaction occurs in two steps, in the first step the polyol reacts with the diisocyanate to form an intermediate called a prepolymer, which will later be co-linked with an amine or glycol. Polyols are characterized by having hydroxy functional groups (-OH) at both ends and will form the elastic part of the molecule; It may be polyester or polyether or a mixture thereof. Diisocyanates, instead, will have isocyanate groups (-NCO) at their ends and will be the hard part of the polyurethane. The most commonly used isocyanate is diphenylmethane diisocyanate (“MDI”, 1-isocyanate-4-[(4-phenylisocyanate)methyl]benzene).

Since the reaction takes place between -NCO and -OH groups to form urea linkages and the molar ratio of isocyanate to polyol is 2:1, the final product will be a macrodiisocyanate, i.e. the prepolymer will have -NCO groups at the terminals. It would be a giant molecule.

Chain extension is obtained by adding a difunctional amine (H ₂ NR-NH ₂ ) to the prepolymer, which reacts with the -NCO group to form a urethane linkage. The exothermic reaction increases the molecular weight hundreds of times and with it the viscosity; To keep the product easy to handle, the reaction is carried out in a suitable solvent and a small amount of monofunctional amine is added to control its final length. The most common solvents are dimethylformamide (DMF) and dimethylacetamide (DMAc).

Suitable elastane yarns for the purposes of the present invention are described in international patent application WO0181442.

In a preferred embodiment, the elastane yarn is (A) poly(tetramethylene-ether-co-2methyltetramethylene-ether)glycol, (B) 1-isocyanate-4-[(4'-isocyanatephenyl)methyl] Benzene (abbreviated as "4,4'-MDI") and 23 to 55 mol% of 1-isocyanate-2-[(4'-isocyanatephenyl)methyl]benzene (abbreviated as "2,4'-MDI) based on total diisocyanates. ") is a reaction product between a mixture of (C), and (C) at least one chain extender.

More preferably, the elastane yarn is (A) poly(tetramethylene-ether-co-2methyltetramethylene-ether)glycol, (B) 1-isocyanate-4-[(4'-isocyanatephenyl)methyl] A mixture of benzene and 28 to 55 mole percent of 1-isocyanate-2-[(4'-isocyanatephenyl)methyl]benzene, relative to total diisocyanates, and (C) at least one chain extender.

Preferably, the chain extender is ethylenediamine, 1,4-butanediamine, 1,6-hexanediamine, 1,2-propanediamine, 1,3-propanediamine, 2-methyl-1,5-pentanediamine, 1,4-cyclohexanediamine, 1,3-cyclohexanediamine, 1,3-diaminopentane, or a mixture thereof.

In a preferred embodiment, the chain extender is ethylenediamine.

The elastane yarn is preferably obtained by dry spinning.

Preferably, the bielastic fabric comprises at least 60% biopolyamide yarn, more preferably at least 70% biopolyamide yarn.

Preferably, the bielastic fabric comprises at least 5% elastane yarn, more preferably at least 15% elastane yarn.

In an embodiment, the elastane yarn has a count of 10 to 200 dTex, preferably 15 to 100 dTex.

Alternatively, commercially available elastane yarns such as Easy Set LYCRA® sold by Invista can be used.

Preferably, the bielastic fabric has a basis weight of 50 to 270 grams per square meter (g/sqm).

Basis weight is the weight of the fabric per unit area expressed in grams per square meter, which represents the total amount of fibers in the fabric. Generally, for experimental reasons, reference is made to the "standard basis weight", which is rounded to tens of grams and is therefore different from the actual basis weight, which corresponds to the actual weight per unit area. For the purposes of the present invention, the indicated basis weight is the standard basis weight and corresponds to the actual basis weight ±5 g/sqm. The determination of basis weight is obtained by taking a fabric circle with a diameter of 11 cm and weighing it on a precision balance.

In some embodiments, the bielastic fabric includes at least 60% biopolyamide yarn and at least 5% elastane yarn.

Preferably, the bielastic fabric comprises at least 70% biopolyamide yarns and at least 15% elastane yarns.

More preferably, the bielastic fabric comprises 75 to 90% biopolyamide yarn and 10 to 25% elastane yarn.

Preferably, the bielastic fabric has jersey stitch or interlock stitch.

“Jersey” is a fabric manufactured with stocking stitch; The name refers to most products of the knitwear industry. Produced on a knitting machine, it is elastic in both length and width, and has the characteristic of not unraveling when made into a warp yarn. An example of a jersey fabric pattern appears in Figure 1.

“Interlock” is a fabric knitted crosswise; This is a variation of jersey but easier to cut; It is one of the basic weaves of weft knitting, i.e. it is made on a double knitting machine with two series of needles operating in opposite positions. The cylinder needle matches the dial needle, so they cannot sew together; Accordingly, one yarn is worked by the odd-numbered needles of the cylinder needle and the even-numbered needles of the dial needle to form the first row of rib stitches. The yarn is then worked by needles that did not work the first row: thus a second row of ribs is obtained, which “intersects” the first row. This results in a thickness and volume similar to that of a rib stitch, but with much reduced extensibility. Examples of interlocked fabric patterns appear in Figures 3 and 4.

In some embodiments, the bielastic fabric has a basis weight of 100 to 250 g/sqm.

Preferably, the bielastic fabric has a basis weight of 180 to 210 g/sqm, more preferably 190 to 200 g/sqm.

Preferably, the bielastic fabric has a basis weight of 100 to 140 g/sqm, more preferably 110 to 130 g/sqm.

Preferably, the bielastic fabric has a basis weight of 160 to 200 g/sqm, more preferably 170 to 190 g/sqm.

In some embodiments, the bielastic fabric has an elasticity of 40 to 200% of the weft yarn.

Preferably, the bielastic fabric has a weft elasticity of 45 to 90%, more preferably 50 to 80%.

Preferably, the bielastic fabric has a weft elasticity of 120 to 200%, more preferably 140 to 180%.

Preferably, the bielastic fabric has a weft elasticity of 110 to 190%, more preferably 130 to 180%.

In some embodiments, the bielastic fabric has a warp elasticity of 30 to 200%.

Preferably, the bielastic fabric has a warp elasticity of 35 to 80%, more preferably 45 to 70%.

Preferably, the bielastic fabric has a warp elasticity of 120 to 200%, more preferably 140 to 180%.

Preferably, the bielastic fabric has a warp elasticity of 50 to 100%, more preferably 60 to 90%.

More preferably, the bielastic fabric has a basis weight of 100 to 250 g/sqm, a weft elasticity of 40 to 200% and a warp elasticity of 30 to 200%.

For the purposes of the present invention, elasticity is measured by taking a 10×5 cm ² strip of fabric and placing it in a dynamometer (e.g. dynamometer Zwick/Roell Z0,5). “Elasticity of the weft” refers to a measurement of elasticity taken in the weft direction, while “elasticity of the warp” refers to a measurement of elasticity taken in the warp direction.

In some embodiments, the bielastic fabric comprises 75 to 90% biopolyamide yarn and 10 to 25% elastane yarn, jersey stitch, basis weight of 180 to 210 g/sqm, weft yarn of 45 to 90%. It has an elasticity of 35 to 80% and a slope of 35 to 80%. Preferably, the bielastic fabric comprises 80 to 90% biopolyamide yarn and 10 to 20% elastane yarn, jersey stitch, basis weight of 190 to 200 g/sqm, 50 to 80% of weft yarn. It has elasticity and elasticity with a slope of 45 to 70%.

In another embodiment, the bielastic fabric comprises 75 to 90% biopolyamide yarn and 10 to 25% elastane yarn, jersey stitch, basis weight of 100 to 140 g/sqm, weft yarn of 120 to 200%. It has an elasticity of 120 to 200% and a slope of 120 to 200%. Preferably, the bielastic fabric comprises 70 to 80% biopolyamide yarn and 20 to 30% elastane yarn, jersey stitch, basis weight of 110 to 130 g/sqm, 140 to 180% of weft yarn. It has elasticity and elasticity with a slope of 140 to 180%.

In another embodiment, the bielastic fabric comprises 75 to 90% biopolyamide yarn and 10 to 25% elastane yarn, interlock stitch, basis weight of 160 to 200 g/sqm, 110 to 190% It has the elasticity of the weft yarn and the elasticity of the warp yarn of 50 to 100%. Preferably, the bielastic fabric comprises 70 to 80% biopolyamide yarn and 20 to 30% elastane yarn, interlocked stitch, basis weight of 170 to 190 g/sqm, weft yarn of 130 to 180%. It has an elasticity of 60 to 90% and a slope of 60 to 90%.

Optionally, the bielastic fabric may further comprise at least one natural fiber yarn selected from wool, cotton, silk and flax.

Optionally, the bielastic fabric may further comprise at least one synthetic fiber yarn selected from polyester, polyamide, acetate, acrylic, rayon, and polyolefin such as polyethylene or polypropylene.

In some embodiments, the bielastic fibers consist essentially of biopolyamide yarns and elastane yarns. The expression “consisting essentially of” indicates that the fabric may additionally comprise yarns of different types, but this does not change the technical characteristics of the final bielastic fabric.

In another embodiment, the bielastic fabric is comprised of biopolyamide yarns and elastane yarns.

All aspects that have been identified as preferred and advantageous for bielastic fabrics comprising biopolyamide yarns and elastane yarns include bielastic fabrics consisting essentially of biopolyamide yarns and elastane yarns and biopolyamide yarns and elastane yarns. It should be understood that it should be considered similarly desirable and advantageous for a bi-elastic fabric consisting of.

In another aspect, the invention relates to a method for making a bi-elastic fabric as described above, comprising the following steps:

a) obtaining a fabric by stitching biopolyamide yarn and elastane yarn,

b) heat-setting the fabric at a temperature of less than 160° C. over a period of less than 100 seconds; and, optionally,

c) dyeing the thus heat-fixed fabric.

In step a) of the method, the fabric is obtained according to procedures known in the art.

Preferably, the fabric is obtained by circular knitting, stitching two yarns.

More preferably, the fabric has jersey stitches or interlock stitches.

For the purposes of this invention, knitting looms are selected based on the gauge of stitches they produce; Preferably, the gauge E (expressed in English as "number of stitches per inch") ranges from E20 to E50.

In particular, jersey fabrics are obtained on single knitting machines, whereas interlock fabrics are obtained on double knitting machines.

In step b) of the method, a heat-setting step of the fabric obtained in step a) is carried out.

Heat-setting is a heat treatment to fix the fabric, give it dimensional stability, and keep the mass per unit area of the finished fabric constant.

Heat treatment can be performed with a variety of heat sources:

- In tentering machines, warm air

- In a vaporizer, pressurized vapor

- In HT equipment, warm water.

For standard polyamide fabrics, the typical temperature at which heat-setting is performed is 190 to 195°C.

Biopolyamide allows the heat-setting temperature to be lowered to about 165°C.

For standard elastic material fabrics, the typical temperature at which heat-setting is performed is 190 to 195°C.

Surprisingly, by combining the biopolyamide yarn and the elastane yarn as described above, it is possible to obtain a heat-set fabric with excellent elastic properties and high dimensional stability by performing heat-setting step b) at a temperature of 160° C. or lower. I found that it was possible. This allows clear advantages in terms of energy consumption and production efficiency, since the process time is reduced without compromising the technical characteristics of the fabric, such as softness to the touch and dual elasticity, while maintaining the original brilliant color.

These results are even more surprising when considering that for the Easy Set LYCRA® yarns available from INVISTA, the temperature suggested by the manufacturer for heat setting is 170 to 175°C.

Therefore, the combination of yarns of the present invention goes beyond the already significant advantages of single yarns compared to traditional yarns considered individually.

Preferably, heat-setting step b) is carried out over a period of 30 to 70 seconds, more preferably 40 to 45 seconds.

Preferably, heat-setting step b) is carried out at a temperature of 100 to 160°C, more preferably 120 to 160°C.

Optionally, the method also comprises step c) of dyeing the heat-set fabric.

The steps may be carried out according to techniques known in the art, but the dyeing is preferably carried out in an overflow machine at atmospheric pressure. In these types of machines, the fabric moves at various speeds in a bath consisting of water, auxiliary products and dyes. The maximum temperature that can be achieved is below 100℃.

In a preferred embodiment, staining step c) comprises the following substeps:

i) refining at 80 to 100°C for 10 to 20 minutes, preferably at 90°C for 15 minutes,

ii) neutralizing the refined product at 50 to 70°C for 5 to 20 minutes, preferably at 60°C for 10 minutes,

iii) dyeing at 90 to 110°C for 15 to 30 minutes with a dye dosage that has a persistence of 20 to 40 minutes, preferably at 98°C for 24 minutes with a dye dosage that has a persistence of 30 minutes,

iv) stripping at 30 to 50°C for 5 to 20 minutes, preferably at 40°C for 10 minutes,

v) treatment with a fixer at 50 to 90°C for 10 to 30 minutes, preferably at 70°C for 20 minutes, and

vi) Final cold washing step.

After this step, the dyed fabric is discharged from the machine and opened using a specific machine.

Afterwards, the fabric is dried. Preferably, drying is carried out in a tentering machine at a temperature of 90° C. and at a speed of about 20 meters per minute.

In another aspect, the invention relates to a bi-elastic fabric obtainable by the method described above, the bi-elastic fabric comprising biopolyamide yarn and elastane yarn.

The fabric thus obtained is very soft, comfortable and technical. Therefore, it is particularly suitable for marine clothing such as swimsuits, underwear and sportswear.

Accordingly, in another aspect, the invention also relates to an article of clothing or furniture made at least in part from the bi-elastic fabric of the invention.

“Articles of clothing” include clothing for men, women, or children, such as shirts, pants, skirts, jackets, dresses, shirts, blouses, and sweaters, as well as handbags, briefcases, wallets, wallets, key cases, cases for phones and tablets, etc. Accessories refer to any article. In particular, it refers to articles of clothing suitable for marine clothing such as swimsuits, underwear and sportswear.

“Article of furniture” is meant to include any article of household linen such as bedspreads, curtains, tablecloths and linens for pillows, benches, armchairs, sofas, chairs, beds and ottomans.

It should be understood that all embodiments that have been found to be preferred and advantageous for the bielastic fabric should be regarded as similarly preferred and advantageous for the manufacturing process and the bielastic fabric obtained thereby, as well as articles of clothing or articles of furniture.

All combinations of the bi-elastic fabrics, the manufacturing process and the bi-elastic fabrics obtained thereby as well as preferred aspects and embodiments of the above-mentioned articles of clothing or articles of furniture are further understood as described.

The features and advantages of the present invention will become more apparent from the following detailed description, the embodiments shown by way of non-limiting examples, and the accompanying drawings:
- Figure 1 shows the pattern of jersey fabric (weave of stocking stitch) viewed from the knit side on the left and the purl side on the right;
- Figure 2 shows the double elastic jersey fabric obtained from Example 1;
- Fig. 3 shows a pattern of interlock fabric, showing a frontal alternation of the front and back stitches: the latter are shown by thinner lines alone, to aid the understanding of the drawing itself, which in reality are both equal in length and width;
- Figure 4 shows the same pattern of interlocked fabric as in Figure 1, with the alternation of front and rear stitches in perspective; and
- Figure 5 shows the bi-elastic interlock fabric obtained from Example 3.

The following is a non-limiting working example of the invention.

Example 1

Biopolyamide yarn 6.6 (marketed as Fulgar Bio® by Fulgar SpA) and elastane yarn (marketed as Easy Set LYCRA® by Invista) were circularly knitted on a single knitting machine (gauge E = E28). , produced a jersey fabric comprising 83% biopolyamide yarn (count of 88 dTex) and 17% elastane yarn (count of 44 dTex) with a basis weight of 195 g/sqm.

The jersey fabric thus obtained was heat-set in a tentering machine at a temperature of 160° C. over a period of 40 to 45 seconds.

Afterwards, a staining step was performed; The fabric was placed in an overflow machine and the following dyeing cycle was followed:

- Refining at 90℃ for 15 minutes

- Neutralize the refined product for 10 minutes at 60℃

- Dyeing at 98°C for 24 minutes with a dye dosage that is permanent for 30 minutes.

- Stripping at 40℃ for 10 minutes

- treatment with fixative for 20 minutes at 70°C, and

- Final cold wash.

After this step, the dyed fabric is discharged from the machine and opened using specific machinery.

The fabric is then dried in a tentering machine at a temperature of 90° C. at a speed of approximately 20 meters per minute.

The bielastic fabric thus obtained is shown in Figure 2 and has a basis weight of 195 g/sqm, a weft elasticity of 60% and a warp elasticity of 50%. The determination of basis weight is obtained by taking a circle of fabric with a diameter of 11 cm and weighing it on a precision balance. Instead, elasticity is measured by taking a 12 cm long strip of fabric and placing it on a dynamometer Zwick/Roell Z0,5.

Example 2

Biopolyamide yarn 6.6 (marketed as Fulgar Bio® by Fulgar SpA) and elastane yarn (marketed as Easy Set LYCRA® by Invista) were circular knitted on a single knitting machine (gauge E = E44) to obtain 115 g/ A jersey fabric was produced comprising 76% biopolyamide yarn (count 28 dTex) and 24% elastane yarn (count 22 dTex) with a basis weight of sqm.

The jersey fabric thus obtained was heat-set in a tentering machine at a temperature of 160° C. over a period of 40 to 45 seconds.

Afterwards, a staining step was performed; The fabric was placed in an overflow machine and the following dyeing cycle was followed:

- Refining at 90℃ for 15 minutes

- Neutralize the refined product for 10 minutes at 60℃

- Dyeing at 98°C for 24 minutes with a dye dosage that is permanent for 30 minutes.

- Stripping at 40℃ for 10 minutes

- treatment with fixative for 20 minutes at 70°C, and

- Final cold wash.

After this step, the dyed fabric is discharged from the machine and opened using specific machinery.

The fabric is then dried in a tentering machine at a temperature of 90° C. at a speed of approximately 20 meters per minute.

The bielastic fabric thus obtained has a basis weight of 115 g/sqm, a weft elasticity of 160% and a warp elasticity of 160%. The determination of basis weight is obtained by taking a circle of fabric with a diameter of 11 cm and weighing it on a precision balance. Instead, elasticity is measured by taking a 12 cm long strip of fabric and placing it on a dynamometer Zwick/Roell Z0,5.

Example 3

Biopolyamide yarn 6.6 (marketed as Fulgar Bio® by Fulgar SpA) and elastane yarn (marketed as Easy Set LYCRA® by Invista) were circular knitted on a single knitting machine (gauge E = E40) to obtain 175 g/ An interlock fabric was produced comprising 77% biopolyamide yarn (count 28 dTex) and 23% elastane yarn (count 22 dTex) with a basis weight of sqm.

The interlock fabric thus obtained was heat-set in a tentering machine at a temperature of 160° C. over a period of 40 to 45 seconds.

Afterwards, a staining step was performed; The fabric was placed in an overflow machine and the following dyeing cycle was followed:

- Refining at 90℃ for 15 minutes

- Neutralize the refined product for 10 minutes at 60℃

- Dyeing at 98°C for 24 minutes with a dye dosage that is permanent for 30 minutes.

- Stripping at 40℃ for 10 minutes

- treatment with fixative for 20 minutes at 70°C, and

- Final cold wash.

After this step, the dyed fabric is discharged from the machine and opened using specific machinery.

The fabric is then dried in a tentering machine at a temperature of 90° C. at a speed of approximately 20 meters per minute.

The bielastic fabric thus obtained is shown in Figure 5 and has a basis weight of 175 g/sqm, a weft elasticity of 150% and a warp elasticity of 70%. The determination of basis weight is obtained by taking a circle of fabric with a diameter of 11 cm and weighing it on a precision balance. Instead, elasticity is measured by taking a 12 cm long strip of fabric and placing it on a dynamometer Zwick/Roell Z0,5.

Example 4

Biopolyamide yarn 6.6 (marketed as Fulgar Bio® by Fulgar SpA) and elastane yarn (marketed as Easy Set LYCRA® by Invista) were circular knitted on a single knitting machine (gauge E = E28) to obtain 195 g/ A jersey fabric was produced comprising 83% biopolyamide yarn (count of 88 dTex) and 17% elastane yarn (count of 44 dTex) with a basis weight of sqm.

The jersey fabric thus obtained was heat-set in a tentering machine at a temperature of 150° C. over a period of 50 to 55 seconds.

Afterwards, a staining step was performed; The fabric was placed in an overflow machine and the following dyeing cycle was followed:

- Refining at 90℃ for 15 minutes

- Neutralize the refined product for 10 minutes at 60℃

- Dyeing at 98°C for 24 minutes with a dye dosage that is permanent for 30 minutes.

- Stripping at 40℃ for 10 minutes

- treatment with fixative for 20 minutes at 70°C, and

- Final cold wash.

After this step, the dyed fabric is discharged from the machine and opened using specific machinery.

The fabric is then dried in a tentering machine at a temperature of 90° C. at a speed of approximately 20 meters per minute.

The bielastic fabric thus obtained has a basis weight of 195 g/sqm, a weft elasticity of 60% and a warp elasticity of 50%. The determination of basis weight is obtained by taking a circle of fabric with a diameter of 11 cm and weighing it on a precision balance. Instead, elasticity is measured by taking a 12 cm long strip of fabric and placing it on a dynamometer Zwick/Roell Z0,5.

Claims (16)

A heat-set bielastic fabric comprising biopolyamide yarn and elastane yarn,
The fabric has a basis weight of 100 to 250 g/sqm, a weft elasticity of 40 to 200% and a warp elasticity of 30 to 200%, and the fabric undergoes the following manufacturing steps: Heat set bi-elastic fabric obtained by a process comprising:
a) obtaining a fabric by stitching biopolyamide yarn and elastane yarn,
b) heat-setting the fabric at a temperature of up to 160° C. over a period of up to 100 seconds.
2. The bielastic fabric of claim 1, comprising at least 5% elastane yarn.
The bielastic fabric of claim 1 comprising at least 60% biopolyamide yarn.
2. The bi-elastic fabric of claim 1, wherein the bi-elastic fabric has a basis weight of 50 to 270 g/sqm.
The bielastic fabric of claim 1, wherein the biopolyamide yarn has a count of 10 to 200 dTex.
The dual elastic fabric of claim 1, wherein the elastane yarn has a count of 10 to 200 dTex.
2. The bielastic fabric of claim 1, wherein the bielastic fabric comprises at least 60% biopolyamide yarn and at least 5% elastane yarn.
2. The bi-elastic fabric of claim 1, wherein the bi-elastic fabric has jersey stitches or interlock stitches.
2. The bielastic fabric of claim 1, wherein the bielastic fabric comprises 75 to 90% biopolyamide yarn and 10 to 25% elastane yarn, jersey stitch, basis weight of 180 to 210 g/sqm, 45 to 90%. having an elasticity of the weft yarn and an elasticity of the warp yarn of 35 to 80%, or
Comprising 75-90% biopolyamide yarn and 10-25% elastane yarn, jersey stitch, basis weight 100-140 g/sqm, weft elasticity 120-200% and warp yarn 120-200% Having the elasticity of, or
Comprising 75 to 90% biopolyamide yarn and 10 to 25% elastane yarn, interlocked stitch, basis weight of 160 to 200 g/sqm, weft elasticity of 110 to 190% and elasticity of 50 to 100% A double elastic fabric having the elasticity of the warp yarn.
10. The bielastic fabric of claim 9, wherein the bielastic fabric comprises 80 to 90% biopolyamide yarn and 10 to 20% elastane yarn, jersey stitch, basis weight of 190 to 200 g/sqm, 50 to 80%. having an elasticity of the weft yarn and an elasticity of the warp yarn of 45 to 70%, or
Comprising 70-80% biopolyamide yarn and 20-30% elastane yarn, jersey stitch, basis weight 110-130 g/sqm, weft elasticity 140-180% and warp yarn 140-180% Having the elasticity of, or
Comprising 70-80% biopolyamide yarn and 20-30% elastane yarn, interlocked stitch, basis weight of 170-190 g/sqm, weft elasticity of 130-180% and 60-90% A double elastic fabric having the elasticity of the warp yarn.
A method for producing the dual elastic fabric of claim 1,
a) stitching biopolyamide yarns and elastane yarns to obtain a fabric,
b) heat-setting the fabric at a temperature of less than 160° C. over a period of less than 100 seconds; and, optionally,
c) A method of making a bielastic fabric, comprising the step of dyeing the fabric thus heat-fixed.
The manufacturing method according to claim 11, wherein the heat-setting step b) is performed over a period of 30 to 70 seconds.
The manufacturing method according to claim 11, wherein the heat-setting step b) is performed at a temperature of 100 to 160°C.
The method of claim 11, wherein the dyeing step c) is
i) refining at 80 to 100°C for 10 to 20 minutes,
ii) neutralizing the refined product at 50 to 70°C for 5 to 20 minutes,
iii) dyeing with dye dosage at 90 to 110°C for 15 to 30 minutes and then maintaining for 20 to 40 minutes,
iv) stripping at 30 to 50°C for 5 to 20 minutes,
v) treatment with a fixer at 50 to 90°C for 10 to 30 minutes, and
vi) A manufacturing method comprising a final cold washing step.
A garment made at least in part from the bi-elastic fabric of claim 1.
An article of furniture made at least in part from the bi-elastic fabric of claim 1.