Preparation Method of Polyester Cord Fabric with Low Denier and High Modulus

Abstract

The present invention discloses a preparation method of polyester cord fabric with low denier and high modulus, including steps of: spinning, reducing melt discharge volume for extruding yarn with denier of 500-1000 D; using high-speed motor and heat roller, spinning speed of 6000-6500 m/min to produce raw yarn; performing initial and repeat twisting of raw yarn by straight twisting machine; performing weaving of twisted yarn using Dornier air-jet loom to produce cord fabric, when weaving and reeding-in, using two into a reed way, adding creel roller bearing and creel single spindle tension control belt to improve uniformity; performing dipping of cord fabric using two-bath dipping, adjusting temperature to 250-260 degrees Celsius, tension to 0.3-2.9 daN/each yarn of key area, running speed of yarn to 55-70 m/min. The polyester cord fabric with low denier and high modulus can reduce rolling resistance and fuel consumption, and improve performance.

Claims

1. A preparation method of polyester cord fabric with low denier and high modulus, being characterized in that, includes the following steps of: 1) spinning, reducing melt discharge volume for extruding yarn with denier of 500˜1000 D; using high-speed motor and heat roller, and spinning speed of 6000˜6500 m/min to produce raw yarn; 2) twisting yarn, performing initial and repeat twisting of the raw yarn by a straight twisting machine to produce twisted yarn; 3) weaving, performing weaving of the twisted yarn by using a Dornier air-jet loom to produce a cord fabric, when weaving and reeding-in, using two into a reed way, and at the same time, adding creel roller bearing and creel single spindle tension control belt to improve uniformity of the fabric; 4) dipping, performing dipping of the cord fabric using two-bath dipping method, adjusting the temperature of a key area to 250-260 degrees Celsius, the tension of the key area to 0.3 to 2.9 daN/each yarn, running speed of yarn to 55 to 70 m/min to produce the polyester cord fabric with low denier and high modulus.

2. The preparation method of polyester cord fabric with low denier and high modulus according to claim 1, being characterized in that, the raw yarn has a modulus of 105 to 120 mN/dtex and a strength of 9.0 to 9.5 g/d.

3. The preparation method of polyester cord fabric with low denier and high modulus according to claim 2, being characterized in that, the twist factors are both 430 to 435 of target twist of the initial and repeat twisting.

4. The preparation method of polyester cord fabric with low denier and high modulus according to claim 3, being characterized in that, the cord fabric is dipped in ovenes, tension zones and glue grooves in turn in the step 4).

5. The preparation method of polyester cord fabric with low denier and high modulus according to claim 4, being characterized in that, ovenes contain six ovenes with different temperature.

6. The preparation method of polyester cord fabric with low denier and high modulus according to claim 5, being characterized in that, tension zones include five tension zones.

7. The preparation method of polyester cord fabric with low denier and high modulus according to claim 6, being characterized in that, glue grooves contain an one-bath glue groove and a two-bath glue groove.

8. The preparation method of polyester cord fabric with low denier and high modulus according to claim 7, being characterized in that, the polyester cord fabric with low denier and high modulus has a diameter range of 0.37 mm (500 D) to 0.54 mm (1000 D).

Description

DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings as required:

Embodiment 1

[0022] (1) The process parameters are as follows:

TABLE-US-00001 TABLE 1 The process parameters of the embodiment 1 of the preparation method of a polyester cord fabric with low denier and high modulus Product specification PET 500D-1000D Raw material Polyester raw yarn 500-1000D Process Process control point conditions Unit Spinning Spinning speed 6000-6500 m/min process Twisting yarn twist direction S / process Target twist factors of 430-435 / initial and repeat twisting Rotational speed 6600 RPM Winch winding 6 Circle number Winding number of 6 Circle inner yarn tensioner Tensioner 50 % selection of creel Overfeeding −1.5 % Scale of inner 1.75 / yarn tensioner Oven H1/H2 145-165 degrees temperature Celsius H3 250-260 degrees Celsius H4/H5 145-165 degrees Celsius H6 250-260 degrees Celsius Dipping speed Dipping speed 70 ± 5  m/min Tension of Z2 0.5 ± 0.1 daN/each tension zone yarn Z3 1.0 ± 0.1 daN/each yarn Z5 1.9 ± 0.1 daN/each yarn Z6 1.9 ± 0.1 daN/each yarn Z7 0.30 ± 0.1  daN/each yarn

[0023] (2) The specific production process includes the following steps:

[0024] 1) spinning: selecting modified polyester (HMLS) with high-modulus and low-shrinkage production line for spinning, replacing metering pumps to reduce the melt discharge volume, replacing high-speed motor and heat roller to provide spinning speed, and performing production using rotational speed of 6000˜6500 m/min;

[0025] 2) twisting yarn, performing twisting yarn of the raw yarn by a straight twisting machine, producing polyester twisted yarn with twist coefficient of 430˜435 according to setting process parameters;

[0026] 3) weaving, finishing weaving of the cord fabric by using a Dornier air-jet loom, when weaving and reeding-in, using two into a reed way, and at the same time, adding creel roller bearing and creel single spindle tension control belt to improve uniformity of the fabric;

[0027] 4) dipping, producing fabric using a dipping machine, dipping successively six ovenes (ovenes temperature being 145˜165 degrees Celsius; 250˜260 degrees Celsius; 145˜165 degrees Celsius; and 250˜260 degrees Celsius) of H1/H2; H3; H4/H5; H6 with the speed of 70±5 m/min, five tension zone (the tension of the key area being 0.29 to 2.0 daN), and dipping effect by two-bath dipping method (an one-bath and a two-bath of polyester glue).

[0028] Polyester cord fabric with 500 D˜1000 D is produced through the embodiment. Raw yarn has 2% elongation modulus of 116.58 mN/dtex and strength of 9.23 g/d. Dipped cord fabric has 2% elongation modulus of 126 mN/dtex and strength of 154.00 N.

Embodiment 2

[0029] (1) The process parameters are as follows:

TABLE-US-00002 TABLE 2 The process parameters of the embodiment 2 of the preparation method of a polyester cord fabric with low denier and high modulus Product specification PET 500D-1000D Raw material Polyester raw yarn 500-1000D Process Process control point conditions Unit Spinning Spinning speed 6000-6500 m/min process Twisting yarn twist direction S / process Target twist factors of 430-435 / initial and repeat twisting Rotational speed 6600 RPM Winch winding 6 Circle number Winding number of 6 Circle inner yarn tensioner Tensioner 50 % selection of creel Overfeeding −1.5 % Scale of inner 1.75 / yarn tensioner Oven H1/H2 145-165 degrees temperature Celsius H3 250-260 degrees Celsius H4/H5 145-165 degrees Celsius H6 250-260 degrees Celsius Dipping speed Dipping speed 65 ± 5  m/min Tension of Z2 0.5 ± 0.1 daN/each tension zone yarn Z3 1.0 ± 0.1 daN/each yarn Z5 2.4 ± 0.1 daN/each yarn Z6 2.4 ± 0.1 daN/each yarn Z7 0.38 ± 0.1  daN/each yarn

[0030] (2) The specific production process includes the following steps:

[0031] 1) spinning: selecting modified polyester (HMLS) production line for spinning, replacing metering pumps to reduce the melt discharge volume, replacing high-speed motor and heat roller to provide spinning speed, and performing production using rotational speed of 6000˜6500 m/min;

[0032] 2) twisting yarn, performing twisting yarn of the raw yarn by a straight twisting machine, producing polyester twisted yarn with twist coefficient of 430˜435 according to setting process parameters;

[0033] 3) weaving, finishing weaving of the cord fabric by using a Dornier air-jet loom, when weaving and reeding-in, using two into a reed way, and at the same time, adding creel roller bearing and creel single spindle tension control belt to improve uniformity of the fabric;

[0034] 4) dipping, producing fabric using a dipping machine, dipping successively six ovenes (ovenes temperature being 145˜165 degrees Celsius; 250˜260 degrees Celsius; 145˜165 degrees Celsius; and 250˜260 degrees Celsius) of H1/H2; H3; H4/H5; H6 with the speed of 65±5 m/min, five tension zone (the tension of the key area being 0.3 to 2.9 daN), and dipping effect by two-bath dipping method (a one-bath and a two-bath of polyester glue).

[0035] Polyester cord fabric with 500 D˜1000 D is produced through the embodiment. Raw yarn has 2% elongation modulus of 108.13 mN/dtex and strength of 8.81 g/d. Dipped cord fabric has 2% elongation modulus of 128 mN/dtex and strength of 160.35 N.

Embodiment 3

[0036] (1) The process parameters are as follows:

TABLE-US-00003 TABLE 3 The process parameters of the embodiment 3 of the preparation method of a polyester cord fabric with low denier and high modulus Product specification PET 500D-1000D Raw material Polyester raw yarn 500-1000D Process Process control point conditions Unit Spinning Spinning speed 6000-6500 m/min process Twisting yarn twist direction S / process Target twist factors of 430-435 / initial and repeat twisting Rotational speed 6600 RPM Winch winding 6 Circle number Winding number of 6 Circle inner yarn tensioner Tensioner 50 % selection of creel Overfeeding −1.5 % Scale of inner 1.75 / yarn tensioner Oven H1/H2 145-165 degrees temperature Celsius H3 250-260 degrees Celsius H4/H5 145-165 degrees Celsius H6 250-260 degrees Celsius Dipping speed Dipping speed 60 ± 5  m/min Tension of Z2 0.5 ± 0.1 daN/each tension zone yarn Z3 1.0 ± 0.1 daN/each yarn Z5 2.9 ± 0.1 daN/each yarn Z6 2.9 ± 0.1 daN/each yarn Z7 0.38 ± 0.1  daN/each yarn

[0037] (2) The specific production process includes the following steps:

[0038] 1) spinning: selecting modified polyester (HMLS) production line for spinning, replacing metering pumps to reduce the melt discharge volume, replacing high-speed motor and heat roller to provide spinning speed, and performing production using rotational speed of 6000˜6500 m/min;

[0039] 2) twisting yarn, performing twisting yarn of the raw yarn by a straight twisting machine, producing polyester twisted yarn with twist coefficient of 430˜435 according to setting process parameters;

[0040] 3) weaving, finishing weaving of the cord fabric by using a Dornier air-jet loom, when weaving and reeding-in, using two into a reed way, and at the same time, adding creel roller bearing and creel single spindle tension control belt to improve uniformity of the fabric;

[0041] 4) dipping, producing fabric using a dipping machine, dipping successively six ovenes (ovenes temperature being 145˜165 degrees Celsius; 250˜260 degrees Celsius; 145˜165 degrees Celsius; and 250˜260 degrees Celsius) of H1/H2; H3; H4/H5; H6 with the speed of 60±5 m/min, five tension zone (the tension of the key area being 0.3 to 2.9 daN), and dipping effect by two-bath dipping method (a one-bath and a two-bath of polyester glue).

[0042] Polyester cord fabric with 500 D˜1000 D is produced through the embodiment. Raw yarn has 2% elongation modulus of 110.10 mN/dtex and strength of 9.10 g/d. Dipped cord fabric has 2% elongation modulus of 131 mN/dtex and strength of 158.61 N.

[0043] The dipping rates of embodiments 1, 2 and 3 are successively reduced, and the tension is successively increased. By adjusting the dipping speed and the tension, the straightness of its microscopic polymer is increased when the cord fabric is in a high tension state, so that crystalline morphology of lamellar crystal is further expanded, and the modulus of the cord fabric is finally improved.

[0044] Product indicators of the above three embodiments are in the following table:

TABLE-US-00004 TABLE 4 product performance indicators of raw yarn and product of embodiments 1, 2 and 3 Raw yarn Dipped cord fabric 2% elongation 2% elongation modulus Strength modulus Name (mN/dtex) (g/d) (mN/dtex) Strength N Embodiment 1 116.58 9.23 126 154.00 Embodiment 2 108.13 8.81 128 160.35 Embodiment 3 110.10 9.10 131 158.61

[0045] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications previously mentioned in the specification and embodiments, and can be applied in various fields suitable for the present invention. For ordinary skilled person in the field, other various changed model, formula and parameter may be easily achieved without creative work according to instruction of the present invention, changed, modified and replaced embodiments without departing the general concept defined by the claims and their equivalent are still included in the present invention. The present invention is not limited to particular details and illustrations shown and described herein.