CN112853607A - Jute non-woven fabric for green packaging bag and preparation method thereof - Google Patents
Jute non-woven fabric for green packaging bag and preparation method thereof Download PDFInfo
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- CN112853607A CN112853607A CN202011594499.5A CN202011594499A CN112853607A CN 112853607 A CN112853607 A CN 112853607A CN 202011594499 A CN202011594499 A CN 202011594499A CN 112853607 A CN112853607 A CN 112853607A
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- needling
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
- D04H1/485—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with weld-bonding
Abstract
The invention relates to a jute non-woven fabric for a green packaging bag and a preparation method thereof, wherein jute fibers, polybutylene adipate-terephthalate (PBAT) short fibers and viscose fibers are used as raw materials to prepare the non-woven fabric, the mass content of the jute fibers in the raw materials is not less than 50%, the mass content of the PBAT short fibers is not less than 10%, the temperature of hot rolling setting in a non-woven process is 115-118 ℃, the hot rolling speed is 25-45 m/min, and the pressure of a rolling roll line is 200-400N/cm; in the prepared jute non-woven fabric for the green packaging bag, jute fibers, viscose fibers and PBAT short fibers are mutually entangled and reinforced at the inner layer, and meanwhile, the fused PBAT short fibers on the surface layer of the non-woven fabric have a bonding effect on the jute fibers and the viscose fibers, so that the jute non-woven fabric has a smooth surface and has excellent breaking strength, bursting strength and wear resistance index.
Description
Technical Field
The invention belongs to the technical field of jute non-woven fabrics, and relates to a jute non-woven fabric for a green packaging bag and a preparation method thereof.
Background
Through preliminary estimation, the express industry in China only consumes about 180 ten thousand tons of plastic wastes every year and shows a rapid growth trend. Traditional plastics can not be biodegraded into inorganic matters or water and carbon dioxide, and the non-woven fabrics containing low-melting-point polyester fibers, polypropylene fibers and ES fibers have high breaking strength and elastic modulus, but after entering the environment, the non-degradability can cause continuous pollution, so that the search for alternative green environment-friendly materials for manufacturing packaging bags becomes the key point of research at present.
China is one of the most abundant countries of the world, jute fiber has high strength and is biodegradable, and the jute fiber can be prepared into green and environment-friendly packaging bags by combining the excellent performance of the jute fiber with a non-woven processing technology. The viscose fiber belongs to a regenerated cellulose fiber, has excellent spinning performance, weaving performance and biodegradability, and can be decomposed into carbon dioxide and water under natural conditions. Poly (butylene adipate terephthalate) (PBAT) is a novel biodegradable copolyester with good mechanical and thermal properties.
The needle punching method is a processing method in which a fiber web is pierced by needles of various shapes to entangle and tightly bond fibers. The needle punched fiber net is fluffy, good in permeability and excellent in mechanical property, but has rough surface and low smoothness. The hot-rolling bonding is to heat and press the needle-punched fiber web by using a heating roller, so that hot-melt fibers in the fiber web are melted, flowed and diffused to generate bonding effect, thereby reinforcing the fiber web. The hot-rolled non-woven fabric has the advantages of smooth and clean surface, stable size structure and good wear resistance. The packaging material is required to have smooth surface, good softness and good wear resistance, so the production of the jute non-woven fabric for packaging needs to be matched with the needling and hot rolling bonding process.
The invention patent with publication number CN101381929A discloses a high-strength easily degradable fibrilia non-woven fabric and a production method thereof, which is processed into the fibrilia non-woven fabric by using 50-70% of fibrilia and 30-50% of ES fiber through a non-woven technology. The main components of the ES fiber are polymer polypropylene PP and polyethylene PE, which have overlarge molecular weight, strong hydrophobicity, low surface energy and very slow biodegradation, and a large amount of greenhouse gas is generated by landfill treatment, and harmful substances such as dioxin, polychlorinated biphenyl, furan and the like can be generated by burning. The melting point of the ES fiber is 130 ℃, the temperature used in the heat bonding treatment process of the method is 130-160 ℃, the temperature is higher than the melting point, and the bonding fiber is completely melted, so that the non-woven fabric has high stiffness and is not beneficial to the application of a packaging bag.
The invention discloses a fibrilia non-woven fabric and a production method thereof with the publication number of CN1746360A, and the fibrilia non-woven fabric is prepared by using 50-80% of fibrilia and 50-20% of low-melting-point fiber through the steps of blooming, fluffing, carding, forming a net, needle punching, and calendaring and shaping. The low-melting-point fiber is usually prepared by composite spinning of common polyester and modified polyester and is difficult to biodegrade. The skin layer can be melted and generates a bonding effect or a parallel structure with the skin core at the temperature of 110-150 ℃, the calendering and shaping process of the invention is to send the needled fiber web into an oven at the temperature of 180-260 ℃ to bake for 2-10 minutes and then carry out hot rolling, the low-melting-point fiber is completely melted, and the strength of the non-woven fabric can be improved to a certain extent.
The master academic thesis "research on forming process and degradation performance of jute needled nonwoven material" uses a single-factor analysis method to study the influence of three process parameters, namely time, temperature and pressure, on the strength of the nonwoven material in the thermal bonding process. The used bonding fiber is 4080 fiber, the melting point is 71.43 ℃, the temperature parameters are 115 ℃, 130 ℃ and 145 ℃, and the bonding fiber is completely melted, so that the jute non-woven fabric has high stiffness and is not beneficial to packaging application.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a jute non-woven fabric for a green packaging bag and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of jute non-woven fabric for green packaging bags is characterized in that jute fiber and PBAT short fiber are used as main raw materials to prepare the non-woven fabric;
the mass content of jute fiber in the raw material is not less than 50 percent, and the mass content of PBAT short fiber is not less than 10 percent;
the hot rolling setting temperature in the non-woven process is 115-118 ℃, the hot rolling speed is 25-45 m/min, and the roller linear pressure is 200-400N/cm.
As a preferred technical scheme:
according to the preparation method of the jute non-woven fabric for the green packaging bag, the raw materials also contain viscose fibers, wherein the raw materials comprise 50-70% by mass of the jute fibers, 10-30% by mass of the PBAT short fibers and 0-40% by mass of the viscose fibers.
The preparation method of the jute non-woven fabric for the green packaging bag comprises the following specific process flows of:
(1) compounding the pretreated jute staple fibers and PBAT staple fibers, and then preliminarily mixing and uniformly mixing;
the preliminary mixing is as follows: performing preliminary mixing in a coarse opener;
the uniform mixing is as follows: conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web;
feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; carding the banquet type mixed fibers into a thin fiber web by a carding machine;
(3) firstly, lapping and disorderly drafting a fiber web, and reinforcing the fiber web by needling to obtain a needled fiber web; the disorder drafting is to pass the laid fiber web through a disorder drafting machine to increase the disorder degree of the fiber web structure; the degree of entanglement between fibers is increased during needling.
(4) And carrying out hot rolling and sizing on the needled fiber web through a hot rolling mill to obtain the jute non-woven fabric for the green packaging bag.
In the above-described method for preparing a jute non-woven fabric for a green packing bag, the melting point of the PBAT staple fiber is 121 ℃.
According to the preparation method of the jute non-woven fabric for the green packaging bag, the corner nail curtain speed of the cotton mixing machine is 45-80 m/min, the horizontal curtain speed is 0.3-0.7 m/min, the rotation speed of the cotton homogenizing roller is 582-882 r/min, and the rotation speed of the cotton stripping roller is 412-686 r/min.
According to the preparation method of the jute non-woven fabric for the green packaging bag, the rotating speed of the licker-in roller in the carding process is 600-900 r/min, the rotating speed of the cylinder is 300-500 r/min, the rotating speed of the doffer is 15-40 r/min, and the speed of the working roller is 670-960 r/min.
According to the preparation method of the jute non-woven fabric for the green packaging bag, the lapping mode is cross lapping;
the draft multiple of the disordered draft process is 2.2-2.6, and the small multiple draft with the multi-zone draft multiple of 2.2-2.6 is adopted to ensure that part of fibers originally arranged transversely in the fiber web move longitudinally, so that the difference between the longitudinal strength and the transverse strength of the fiber web is reduced;
the needling density in the needling process is 100-200 needling/cm2The needling depth is 6-8 mm, the needling frequency is 150-350 needling/min, and the number of needling channels is 2.
The invention also provides the jute non-woven fabric for the green packaging bag, which is prepared by the method, wherein fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on other fibers to form a smooth and wear-resistant surface; the other fibers are jute fibers, or the other fibers are jute fibers and viscose fibers.
As a preferred technical scheme:
the jute non-woven fabric for the green packaging bag has the non-woven fabric surface density of 80-100 g/m2The transverse breaking strength is 78-110N, the longitudinal breaking strength is 60-90N, the bursting strength is 56-80N, and the wear-resisting index is 70-95 times/mg.
The principle of the invention is as follows:
because the jute fiber is coarse and has higher rigidity, the fiber is difficult to form a net in the non-weaving process, and the fiber is not easy to be tangled, so that the strength of the fiber net is low. Degradable viscose fiber and PBAT short fiber are added into jute nonwoven, which is beneficial to the jute nonwoven web formation and improves the uniformity of the web. During needling, the slender and soft viscose and PBAT short fibers are easier to tangle, and the strength of the fiber web can be improved. The needle-punched jute fiber net is fluffy but has rough surface and low smoothness, and is required to have smooth, wear-resistant and soft surface as a packaging material, so hot rolling and bonding treatment are required after the needle punching is finished. The hot rolling bonding is to heat and press the needle-punched fiber web by using a heating roller, so that hot melt fibers in the fiber web are melted, flowed and diffused to generate bonding effect, and the fiber web is reinforced after being cooled, the surface is smooth and clean, and the dimensional structure becomes more stable. The melting point of the PBAT staple fibers is lower than the thermal decomposition temperature of the viscose and jute fibers and can be used as binder fibers.
Roll temperature, pressure and hot rolling speed are key factors for hot rolling and setting. Melting can increase the smoothness and stiffness of the nonwoven, but the packaging material requires some softness, and therefore the degree of melting needs to be controlled to produce a bonding effect only on the surface layer of the nonwoven. When the fiber web enters a hot rolling bonding area formed by rollers, the PBAT short fibers move by heated molecular chains, the fibers are melted when the movement is violent, and when the hot rolling temperature is too high, the melted PBAT short fibers enter the non-woven fabric and are also melted, so that the non-woven fabric is stiff; when the hot rolling temperature is too low, the PBAT short fibers cannot be melted to play a role in bonding, so that the non-woven fabric is low in strength, and insufficient in surface smoothness and wear resistance; the invention adopts the hot rolling shaping temperature slightly lower than the PBAT short fiber, and then utilizes the hot rolling pressure and the hot rolling speed to lead the heat effect generated by the deformation of the needled fiber net to melt the PBAT short fiber only positioned on the needled fiber net to form the structure with the surface being bonded and the inner layer of PBAT short fiber being intertwined with the jute fiber and the viscose fiber, and the structure plays a decisive role in the flexible, smooth and wear-resistant performance of the nonwoven material.
The invention adopts the technological parameters of hot rolling temperature of 115-118 ℃, hot rolling speed of 25-45 m/min and roller line pressure of 200-400N/cm. Under the condition, the bonding fibers (PBAT short fibers) in the surface layer of the fiber web are melted and flow and are diffused to the surfaces of adjacent fibers, so that a bonding effect is generated, the PBAT short fibers in the fiber web are only slightly melted or not melted, the unmelted PBAT short fibers are still used as entanglement fibers, the strength of the non-woven fabric is enhanced, the softness of the non-woven fabric is ensured, and the non-woven fabric is favorable for being used as a preparation material of a packaging bag.
Has the advantages that:
the hot rolling temperature adopted by the invention is 115-118 ℃, the hot rolling speed is 25-45 m/min, the linear pressure of a roller is 200-400N/cm, and bonding fibers (PBAT short fibers) in the surface layer of the fiber web are melted and flow and are diffused to the surfaces of adjacent fibers, so that the bonding effect is generated, and the surface of the non-woven fabric is smooth and wear-resistant; and the PBAT short fibers in the fiber web are only slightly melted or not melted and still serve as entangled fibers, so that the strength of the non-woven fabric is enhanced, the softness of the non-woven fabric is ensured, and the PBAT short fibers are favorable for serving as a preparation material of a packaging bag. The density of the non-woven fabric surface is 80-100 g/m2The transverse breaking strength is 78-110N, the longitudinal breaking strength is 60-90N, the bursting strength is 56-80N, and the wear-resisting index is 70-95 times/mg.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A preparation method of jute non-woven fabric for green packaging bags comprises the following specific process flows:
(1) compounding jute fiber, viscose fiber and PBAT short fiber with the melting point of 120 ℃ serving as raw materials, and then sending the raw materials into a coarse opener for preliminary mixing; wherein, the jute fiber accounts for 50 percent by mass, the PBAT short fiber accounts for 10 percent by mass, and the viscose fiber accounts for 40 percent by mass;
(2) conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers; wherein the angle nail curtain speed is 80m/min, the horizontal curtain speed is 0.7m/min, the rotational speed of a cotton-homogenizing roller is 882r/min, and the rotational speed of a cotton-stripping roller is 686 r/min;
(3) feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; wherein the air pressure of the cotton feeding pipeline in the fine opening process is 800Pa, and the air pressure of the cotton outlet pipeline is-200 Pa;
(4) carding the banquet type mixed fibers into a fiber web through a carding machine; wherein the rotating speed of the licker-in the carding process is 900r/min, the rotating speed of the cylinder is 500r/min, the rotating speed of the doffer is 40r/min, and the speed of the working roll is 670 r/min;
(5) lapping the fiber web by a lapping machine; wherein the lapping mode is cross lapping;
(6) the paved fiber net passes through a disorder drafting machine to increase the disorder degree of the fiber net structure; the draft multiple in the disordered draft process is 2.6;
(7) reinforcing the fiber net by needling through a needling machine; wherein the needling density in the needling process is 200 needling/cm2The needling depth is 6mm, the needling frequency is 350 needling/min, and the number of needling channels is 2;
(8) carrying out hot rolling and shaping on the needled fiber web by a hot rolling mill; wherein the hot rolling setting temperature is 115 ℃, the hot rolling speed is 25m/min, and the roller line pressure is 370N/cm;
(9) and winding and rolling the cloth cover.
Finally, preparing jute non-woven fabric for the green packaging bag; the jute fibers, the viscose fibers and the PBAT short fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on the jute fibers and the viscose fibers on the surface layer; the density of the non-woven cloth surface is 80g/m2The transverse breaking strength is 78N, the longitudinal breaking strength is 60N, the bursting strength is 56N, and the abrasion resistance index is 70 times/mg.
Example 2
A preparation method of jute non-woven fabric for green packaging bags comprises the following specific process flows:
(1) compounding jute fiber, viscose fiber and PBAT short fiber with the melting point of 120 ℃ serving as raw materials, and then sending the raw materials into a coarse opener for preliminary mixing; wherein, the raw materials comprise 50 percent of jute fiber, 30 percent of PBAT short fiber and 20 percent of viscose fiber by mass percent;
(2) conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers; wherein the angle nail curtain speed is 73m/min, the horizontal curtain speed is 0.6m/min, the rotational speed of a cotton-homogenizing roller is 882r/min, and the rotational speed of a cotton-stripping roller is 686 r/min;
(3) feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; wherein the air pressure of the cotton feeding pipeline in the fine opening process is 800Pa, and the air pressure of the cotton outlet pipeline is-200 Pa;
(4) carding the banquet type mixed fibers into a fiber web through a carding machine; wherein the rotating speed of the licker-in the carding process is 820r/min, the rotating speed of the cylinder is 450r/min, the rotating speed of the doffer is 34r/min, and the speed of the working roll is 750 r/min;
(5) lapping the fiber web by a lapping machine; wherein the lapping mode is cross lapping;
(6) the paved fiber net passes through a disorder drafting machine to increase the disorder degree of the fiber net structure; the draft multiple in the disordered draft process is 2.5;
(7) reinforcing the fiber net by needling through a needling machine; wherein the needling density in the needling process is 180 needling/cm2The needling depth is 6mm, the needling frequency is 300 needling/min, and the number of needling channels is 2;
(8) carrying out hot rolling and shaping on the needled fiber web by a hot rolling mill; wherein the hot rolling setting temperature is 118 ℃, the hot rolling speed is 45m/min, and the roller linear pressure is 200N/cm;
(9) and winding and rolling the cloth cover.
Finally, preparing the jute non-woven fabric for the green packaging bag for packaging;the jute fibers, the viscose fibers and the PBAT short fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on the jute fibers and the viscose fibers on the surface layer; the density of the non-woven cloth surface is 100g/m2The transverse breaking strength is 110N, the longitudinal breaking strength is 90N, the bursting strength is 80N, and the wear resistance index is 95 times/mg.
Example 3
A preparation method of jute non-woven fabric for green packaging bags comprises the following specific process flows:
(1) compounding jute fiber, viscose fiber and PBAT short fiber with the melting point of 120 ℃ serving as raw materials, and then sending the raw materials into a coarse opener for preliminary mixing; wherein, the raw materials comprise 55 percent of jute fiber, 16 percent of PBAT short fiber and 29 percent of viscose fiber;
(2) conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers; wherein the speed of the angle nail curtain is 62m/min, the speed of the horizontal curtain is 0.5m/min, the rotating speed of the cotton-homogenizing roller is 726r/min, and the rotating speed of the cotton-stripping roller is 537 r/min;
(3) feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; wherein the air pressure of the cotton feeding pipeline in the fine opening process is 800Pa, and the air pressure of the cotton outlet pipeline is-200 Pa;
(4) carding the banquet type mixed fibers into a fiber web through a carding machine; wherein the rotating speed of the licker-in the carding process is 740r/min, the rotating speed of the cylinder is 400r/min, the rotating speed of the doffer is 29r/min, and the speed of the working roll is 810 r/min;
(5) lapping the fiber web by a lapping machine; wherein the lapping mode is cross lapping;
(6) the paved fiber net passes through a disorder drafting machine to increase the disorder degree of the fiber net structure; the draft multiple in the disordered draft process is 2.4;
(7) reinforcing the fiber net by needling through a needling machine; wherein the needling density in the needling process is 160 needling/cm2Depth of penetration7mm, the needling frequency is 250 needling/min, and the number of needling channels is 2;
(8) carrying out hot rolling and shaping on the needled fiber web by a hot rolling mill; wherein the hot rolling setting temperature is 118 ℃, the hot rolling speed is 30m/min, and the roller line pressure is 340N/cm;
(9) and winding and rolling the cloth cover.
Finally, preparing jute non-woven fabric for the green packaging bag; the jute fibers, the viscose fibers and the PBAT short fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on the jute fibers and the viscose fibers on the surface layer; the density of the non-woven cloth surface is 85g/m2The transverse breaking strength is 84N, the longitudinal breaking strength is 68N, the bursting strength is 62N, and the abrasion resistance index is 72 times/mg.
Example 4
A preparation method of jute non-woven fabric for green packaging bags comprises the following specific process flows:
(1) compounding jute fiber, viscose fiber and PBAT short fiber with the melting point of 120 ℃ serving as raw materials, and then sending the raw materials into a coarse opener for preliminary mixing; wherein, the raw materials comprise 60 percent of jute fiber, 30 percent of PBAT short fiber and 10 percent of viscose fiber;
(2) conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers; wherein the speed of the angle nail curtain is 55m/min, the speed of the horizontal curtain is 0.4m/min, the rotating speed of the cotton-homogenizing roller is 726r/min, and the rotating speed of the cotton-stripping roller is 537 r/min;
(3) feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; wherein the air pressure of the cotton feeding pipeline in the fine opening process is 800Pa, and the air pressure of the cotton outlet pipeline is-200 Pa;
(4) carding the banquet type mixed fibers into a fiber web through a carding machine; wherein the rotating speed of the licker-in the carding process is 680r/min, the rotating speed of the cylinder is 350r/min, the rotating speed of the doffer is 23r/min, and the speed of the working roll is 890 r/min;
(5) lapping the fiber web by a lapping machine; wherein the lapping mode is cross lapping;
(6) the paved fiber net passes through a disorder drafting machine to increase the disorder degree of the fiber net structure; the draft multiple in the disordered draft process is 2.3;
(7) reinforcing the fiber net by needling through a needling machine; wherein the needling density in the needling process is 130 needling/cm2The needling depth is 7mm, the needling frequency is 200 needling/min, and the number of needling channels is 2;
(8) carrying out hot rolling and shaping on the needled fiber web by a hot rolling mill; wherein the hot rolling setting temperature is 116 ℃, the hot rolling speed is 30m/min, and the roller line pressure is 280N/cm;
(9) and winding and rolling the cloth cover.
Finally, preparing jute non-woven fabric for the green packaging bag; the jute fibers, the viscose fibers and the PBAT short fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on the jute fibers and the viscose fibers on the surface layer; the density of the non-woven cloth surface is 96g/m2The transverse breaking strength is 104N, the longitudinal breaking strength is 83N, the bursting strength is 74N, and the abrasion resistance index is 83 times/mg.
Example 5
A preparation method of jute non-woven fabric for green packaging bags comprises the following specific process flows:
(1) compounding jute fiber and PBAT short fiber with the melting point of 120 ℃ as raw materials, and sending the raw materials into a coarse opener for preliminary mixing; wherein the jute fiber accounts for 70 percent by mass and the PBAT short fiber accounts for 30 percent by mass in the raw materials;
(2) conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers; wherein the speed of the angle nail curtain is 45m/min, the speed of the horizontal curtain is 0.3m/min, the rotating speed of the cotton-homogenizing roller is 582r/min, and the rotating speed of the cotton-stripping roller is 412 r/min;
(3) feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; wherein the air pressure of the cotton feeding pipeline in the fine opening process is 800Pa, and the air pressure of the cotton outlet pipeline is-200 Pa;
(4) carding the banquet type mixed fibers into a fiber web through a carding machine; wherein the rotating speed of the licker-in the carding process is 600r/min, the rotating speed of the cylinder is 300r/min, the rotating speed of the doffer is 15r/min, and the speed of the working roll is 960 r/min;
(5) lapping the fiber web by a lapping machine; wherein the lapping mode is cross lapping;
(6) the paved fiber net passes through a disorder drafting machine to increase the disorder degree of the fiber net structure; the draft multiple in the disordered draft process is 2.2;
(7) reinforcing the fiber net by needling through a needling machine; wherein the needling density in the needling process is 100 needling/cm2The needling depth is 8mm, the needling frequency is 150 needling/min, and the number of needling channels is 2;
(8) carrying out hot rolling and shaping on the needled fiber web by a hot rolling mill; wherein the hot rolling setting temperature is 117 ℃, the hot rolling speed is 25m/min, and the linear pressure of the roller is 400N/cm;
(9) and winding and rolling the cloth cover.
Finally, preparing jute non-woven fabric for the green packaging bag; the jute fibers and the PBAT short fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on the jute fibers on the surface layer; the density of the non-woven cloth surface is 86g/m2The transverse breaking strength is 93N, the longitudinal breaking strength is 76N, the bursting strength is 69N, and the abrasion resistance index is 75 times/mg.
Claims (9)
1. A preparation method of jute non-woven fabric for green packaging bags is characterized by comprising the following steps: preparing non-woven fabric by using jute fibers and PBAT short fibers as main raw materials;
the mass content of jute fiber in the raw material is not less than 50 percent, and the mass content of PBAT short fiber is not less than 10 percent;
the hot rolling setting temperature in the non-woven process is 115-118 ℃, the hot rolling speed is 25-45 m/min, and the roller linear pressure is 200-400N/cm.
2. The method for preparing the jute non-woven fabric for the green packaging bag according to claim 1, wherein the raw materials further comprise viscose, and the raw materials comprise 50-70% by mass of jute fibers, 10-30% by mass of PBAT short fibers and 0-40% by mass of viscose.
3. The preparation method of the jute non-woven fabric for the green packaging bag according to claim 2, wherein the specific process flow is as follows:
(1) compounding the pretreated jute staple fibers and PBAT staple fibers, and then preliminarily mixing and uniformly mixing;
the preliminary mixing is as follows: performing preliminary mixing in a coarse opener;
the uniform mixing is as follows: conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web;
feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; carding the banquet type mixed fibers into a thin fiber web by a carding machine;
(3) firstly, lapping and disorderly drafting a fiber web, and reinforcing the fiber web by needling to obtain a needled fiber web; the disorder drafting is to pass the laid fiber web through a disorder drafting machine to increase the disorder degree of the fiber web structure; the degree of entanglement between fibers is increased during needling.
(4) And carrying out hot rolling and sizing on the needled fiber web through a hot rolling mill to obtain the jute non-woven fabric for the green packaging bag.
4. The method of preparing a jute non-woven fabric for a green packing bag according to claim 3, wherein the melting point of the PBAT staple fiber is 120 ℃.
5. The preparation method of the jute non-woven fabric for the green packaging bag according to claim 3, wherein in the uniform mixing, the corner nail curtain speed of a cotton mixing machine is 45-80 m/min, the horizontal curtain speed is 0.3-0.7 m/min, the rotation speed of a cotton homogenizing roller is 582-882 r/min, and the rotation speed of a cotton stripping roller is 412-686 r/min.
6. The method for preparing the jute non-woven fabric for the green packaging bag according to claim 3, wherein the rotating speed of a licker-in roller in the carding process is 600-900 r/min, the rotating speed of a cylinder is 300-500 r/min, the rotating speed of a doffer is 15-40 r/min, and the speed of a working roller is 670-960 r/min.
7. The method for preparing a jute non-woven fabric for a green packaging bag according to claim 3, wherein the lapping mode is cross lapping;
the draft multiple in the messy draft process is 2.2-2.6;
the needling density in the needling process is 100-200 needling/cm2The needling depth is 6-8 mm, the needling frequency is 150-350 needling/min, and the number of needling channels is 2.
8. The jute nonwoven fabric for green packaging bags produced by the method of any one of claims 1 to 7, wherein: fibers in the non-woven fabric are mutually entangled, and meanwhile, the fused PBAT short fibers on the surface layer have a bonding effect on other fibers to form a smooth and wear-resistant surface; the other fibers are jute fibers, or the other fibers are jute fibers and viscose fibers.
9. The jute nonwoven fabric for green packaging bags according to claim 8, wherein the nonwoven fabric surface density is 80 to 100g/m2The transverse breaking strength is 78-110N, the longitudinal breaking strength is 60-90N, the bursting strength is 56-80N, and the wear-resisting index is 70-95 times/mg.
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