Manufacturing process of double-layer ES composite fiber smooth and fluffy hot air non-woven fabric

Abstract

The invention discloses a double-layer ES composite fiber smooth and fluffy hot air non-woven fabric manufacturing process, and belongs to the technical field of hot air non-woven fabrics, the double-layer ES composite fiber smooth and fluffy hot air non-woven fabric manufacturing process comprises the following steps: S1, fine denier ES composite fibers and coarse denier ES composite fibers with the fiber denier number smaller than or equal to 1D are pre-opened respectively and then conveyed into a carding machine; s2, stripping the fine-denier ES composite fiber through a single doffer of a fine-denier carding machine, removing the disordered treatment of a disordered condensing roller, and discharging the fine-denier ES composite fiber out of a net to form a fine-denier ES composite fiber layer; s3, stripping the coarse denier ES composite fibers through double doffers of a coarse denier carding machine to form a coarse denier ES composite fiber layer; s4, the coarse denier ES composite fiber layer is laid on the surface of the fine denier ES composite fiber layer after being taken out of the net to form a double-layer ES composite fiber layer, and the double-layer ES composite fiber layer is subjected to hot air bonding to obtain a hot air non-woven fabric; and S5, rolling, slitting and packaging. The hot air non-woven fabric has the advantages of being smooth and fluffy, and the comfort can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot air nonwoven fabrics, and in particular to a manufacturing process of a double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric. Background Art

[0002] Hot air nonwoven fabric is made by combing two-component fibers into a fiber web, and then using hot air from a hot drying device to penetrate the fiber web, so that the low melting point component in the two-component fiber is heated and melted, so that the fibers are adhered to each other and then cooled and fixed to form a hot air nonwoven fabric. Since the molten bonding generated when the hot air penetrates the fiber web is point-shaped rather than regional, the hot air nonwoven fabric has the advantages of good fluffiness and breathability. These advantages make hot air nonwoven fabrics widely used in absorbent sanitary products such as diapers and sanitary napkins, and hot air nonwoven fabrics are usually used as absorbent sanitary products with The surface layer and the bottom layer are in direct contact with the human body, and the absorbent sanitary products have higher requirements on the strength of the non-woven fabric inside to ensure the structural stability of the absorbent sanitary products. If the hot air non-woven fabric uses fibers with higher deniers to ensure its strength, the surface of the hot air non-woven fabric will be rough, and the absorbent sanitary products using the hot air non-woven fabric as the surface layer and the bottom layer will have poor comfort. If the hot air non-woven fabric uses fibers with lower deniers to ensure its comfort, the gram weight of the hot air non-woven fabric needs to be increased to ensure its strength, which will increase the production cost of the hot air non-woven fabric and affect its breathability.

[0003] Based on the above situation, the Chinese patent with announcement number CN112323258A discloses a hot air fluffy cloth manufacturing process, including the following steps: a) opening, putting the composite staple fiber and the polyester staple fiber into the first bag opening machine and the second bag opening machine respectively for bag opening, so that the pre-opened fiber raw material enters the cotton box storage tank under the action of the airflow, and the fibers are opened into small and uniform fiber clusters by the beater roller under the grip of the feeding roller and the cotton feeding plate; b) impurity removal, the beater roller rotates at a high speed to separate the fibers and impurities in the composite staple fiber and the polyester staple fiber, the impurities are adsorbed by the dust suction pipe, and the fibers are blocked by the dust stick and fall back to the beater, The airflow pushes the fibers to continue moving forward; c) In the combing and web-forming process, the composite staple fibers and polyester staple fibers are simultaneously conveyed to the combing machine, which breaks up the loosened fiber clusters and mixes them evenly. The combed fibers are transferred to the doffer and output in the form of a fiber web; d) In the hot air web-fixing process, the initially shaped fiber web is conveyed to the oven for hot air penetration. After the fiber web is conveyed to the oven, it is heated by hot air jet; e) In the softening treatment, the fiber web heated by hot air jet is conveyed to the forging roller for rolling and a layer of softener is applied at the same time; f) In the cooling process, after rolling, it is conveyed to the cold air blower for cooling by cold air.

[0004] The above-mentioned hot air fluffy cloth is a hot air non-woven fabric. The hot air fluffy cloth improves the surface softness by applying a layer of softener on the surface, thereby improving the comfort of human body contact during use. After the softener is applied to the surface of the hot air fluffy cloth, a coating will be formed on the surface. Whether the hot air fluffy cloth is used to make masks or the surface layer of absorbent sanitary products, these products are all sanitary products. During use, they are prone to chemical migration through contact with human body fluids, etc., causing some components in the softener to be absorbed by the human body, posing a potential threat to human health. It needs to be used with caution in sanitary products. Therefore, the hot air fluffy cloth still has room for improvement. Summary of the invention

[0005] In view of the technical defects existing in the background technology, the present invention proposes a production process of a double-layer ES composite fiber smooth and fluffy hot air non-woven fabric, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows: A manufacturing process of a double-layer ES composite fiber smooth and fluffy hot air non-woven fabric, comprising the following steps: S1. Pre-opening the fine denier ES composite fiber and the coarse denier ES composite fiber respectively, removing impurities from the two opened fibers, accurately weighing them, and then conveying them to a carding machine; the fiber denier of the fine denier ES composite fiber is ≤1D; S2, the fine denier ES composite fiber is stripped out of the web by a fine denier carding machine single doffer, and the disorderly treatment of the disorderly condensation roller is cancelled to form a fine denier ES composite fiber layer and laid on the surface of the collecting curtain, and the ratio of the longitudinal direction to the transverse direction of the fiber in the fine denier ES composite fiber layer is 10: (0.5~1); S3, stripping the coarse denier ES composite fiber from a web through a coarse denier carding machine with a double doffer, and forming a coarse denier ES composite fiber layer after random coagulation and laying, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the coarse denier ES composite fiber layer is (4-5):1; S4, after the coarse denier ES composite fiber layer comes out of the net, it is laid on the surface of the fine denier ES composite fiber layer to form a double-layer ES composite fiber layer on the surface of the collecting curtain, and the double-layer ES composite fiber layer is thermally bonded by a thermal bonding machine, and after cooling and shaping, a hot air non-woven fabric is obtained; S5, rolling, slitting and packaging the hot air nonwoven fabric to obtain a hot air nonwoven fabric roll.

[0006] As a further technical solution of the present invention, the skin structure of the fine denier ES composite fiber is polyethylene and the core structure is polypropylene, and the skin structure of the coarse denier ES composite fiber is polyethylene and the core structure is polyester.

[0007] As a further technical solution of the present invention, the gram weight of the hot air non-woven fabric is 16~24gsm.

[0008] As a further technical solution of the present invention, the fine denier ES composite fiber layer has a gram weight of 6-10 gsm.

[0009] As a further technical solution of the present invention, the coarse denier ES composite fiber layer has a gram weight of 10-14 gsm.

[0010] As a further technical solution of the present invention, the fiber denier of the fine denier ES composite fiber is 0.4~1D, and the fiber denier of the coarse denier ES composite fiber is 1.2~6D.

[0011] As a further technical solution of the present invention, in step S2, before the fine denier ES composite fiber layer is stripped off the web, the doffer surface needs to be cleaned and static electricity eliminated.

[0012] As a further technical solution of the present invention, in step S2, the speed of stripping the fine denier ES composite fiber layer out of the mesh is 80-110 m / min.

[0013] As a further technical solution of the present invention, in step S4, the temperature at which the thermal bonding machine performs hot air bonding on the double-layer ES composite fiber layer is 110-150°C.

[0014] The beneficial effects of the present invention are: The hot air nonwoven fabric of the present invention is composed of a fine denier ES composite fiber layer and a coarse denier ES composite fiber layer. One side of the fine denier ES composite fiber layer is set as the direct contact surface with the human body. The fine denier ES composite fiber layer is discharged through a single doffer and the random processing operation of the random condensation roller is eliminated during the discharge process to improve the fiber straightness, making the direct contact surface with the human body smoother and softer, thereby improving the comfort of the hot air nonwoven fabric. The coarse denier ES composite fiber layer is composed of fibers with larger diameters, thereby ensuring the overall strength and fluffiness of the hot air nonwoven fabric. The double doffer is used to strip the net and the net is laid into a net by random condensation laying, thereby ensuring the lateral strength of the hot air nonwoven fabric to improve durability. DETAILED DESCRIPTION

[0015] The implementation mode of the present invention is described below in conjunction with relevant embodiments. The implementation mode of the present invention is not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0016] A manufacturing process of a double-layer ES composite fiber smooth and fluffy hot air non-woven fabric, comprising the following steps: S1. Pre-opening the fine denier ES composite fiber and the coarse denier ES composite fiber respectively, removing impurities from the two types of fibers after opening, accurately weighing them, and then conveying them to a carding machine, wherein the fiber denier of the fine denier ES composite fiber is ≤1D; S2, the fine denier ES composite fiber is stripped out of the web by a fine denier carding machine single doffer, and the disorderly treatment of the disorderly condensation roller is cancelled to form a fine denier ES composite fiber layer and laid on the surface of the collecting curtain, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the fine denier ES composite fiber layer is 10:(0.5~1); S3, stripping the coarse denier ES composite fiber through a coarse denier carding machine with a double doffer to form a coarse denier ES composite fiber layer after random coagulation and laying, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the coarse denier ES composite fiber layer is (4-5):1; S4, after the coarse denier ES composite fiber layer comes out of the net, it is laid on the surface of the fine denier ES composite fiber layer to form a double-layer ES composite fiber layer on the surface of the collecting curtain, and the double-layer ES composite fiber layer is thermally bonded by a thermal bonding machine, and after cooling and shaping, a hot air non-woven fabric is obtained; S5, rolling, slitting and packaging the hot air nonwoven fabric to obtain a hot air nonwoven fabric roll.

[0017] The hot air nonwoven fabric of the present invention is composed of two kinds of fibers with different properties, namely, fine denier ES composite fibers and coarse denier ES composite fibers. The fine denier ES composite fibers can significantly improve the fineness and softness of the hot air nonwoven fabric due to their extremely fine fiber diameter, while increasing the specific surface area of ​​the fibers and providing more abundant fiber gaps inside the hot air nonwoven fabric, thereby improving the moisture absorption, air permeability and warmth retention performance of the hot air nonwoven fabric; the coarse denier ES composite fibers have a relatively large diameter and a relatively high strength, so the hot air nonwoven fabric made of the coarse denier ES composite fibers has higher strength and better wear resistance. The fiber web is high, and the fibers at non-crossing points still maintain their original state after hot air bonding, forming a good supporting effect on the inside of the hot air non-woven fabric, and ensuring the fluffiness of the hot air non-woven fabric; the hot air non-woven fabric is obtained by compounding the fine denier ES composite fiber and the coarse denier ES composite fiber, wherein the fine denier ES composite fiber layer is mainly used as the side in direct contact with the human body, which can make the side of the hot air non-woven fabric in direct contact with the human body soft and smooth, thereby improving the comfort of use of the hot air non-woven fabric, and the coarse denier ES composite fiber layer is mainly to ensure the overall strength and fluffiness of the hot air non-woven fabric, and improve the durability of the hot air non-woven fabric.

[0018] It should be further explained that ES composite fiber is a fiber with a skin-core structure, in which the skin structure of the fine denier ES composite fiber is made of polyethylene and the core structure is made of polypropylene. The skin structure uses polyethylene with a lower melting point to ensure that the fine denier ES composite fiber layer melts the internal fiber surface and bonds to each other under the action of hot air, and the ES composite fiber with polypropylene in the core structure has better softness, which can further improve the comfort of the hot air non-woven fabric in direct contact with the human body; the skin structure of the coarse denier ES composite fiber is made of polyethylene and the core structure is made of polyester. The ES composite fiber with polyester in the core layer has higher strength and support, which can further improve the overall strength and fluffiness of the hot air non-woven fabric; after the coarse denier ES composite fiber layer is laid on the surface of the fine denier ES composite fiber layer to form a double-layer ES composite fiber layer, the polyethylene on the fiber surface is melted and bonded to each other by hot air heating to form a hot air non-woven fabric, one side of the hot air non-woven fabric is composed of fine denier ES composite fibers, which is used for direct contact with the human body and has good comfort, and the other side is composed of coarse denier ES composite fibers to ensure the strength of the hot air non-woven fabric.

[0019] Regarding the production process of the hot air non-woven fabric of the present invention, in step S1, the fine denier ES composite fiber and the coarse denier ES composite fiber are pre-opened by an opening device respectively, and the opening reduces the scale of the lateral connection of the fibers, creates conditions for the fibers to be further loosened to a single state, and is beneficial to the subsequent combing operation. The fiber blocks or fiber bundles can be made looser and more uniform by opening, which is beneficial to the uniform distribution of the fibers in the subsequent processing process, thereby improving the quality and stability of the product. In addition, during the opening process, the density of the fiber blocks or fiber bundles is reduced, and the connection with impurities is weakened, and some impurities with low adhesion can be effectively separated. Then, a strong airflow is generated by an airflow device to absorb or blow away the separated impurities, thereby realizing fiber impurity removal. After impurity removal, the uniform fiber clusters of the fibers are conveyed to the combing machine, and the fiber clusters are accurately weighed during the conveying process, which is beneficial to accurately control the gram weight of the fine denier ES composite fiber layer and the coarse denier ES composite fiber layer.

[0020] In step S2, the fiber clusters formed by the fine denier ES composite fibers are further broken up and mixed evenly in the fine denier carding machine. Specifically, the fibers are hooked, stretched and combed by the needle teeth on the surfaces of the two rollers through the front cylinder and the carding doffer whose needle teeth of the card clothing are arranged in opposite directions. The fibers between the two needle tooth surfaces are partially taken away by the two needle surfaces, and the front cylinder and the carding doffer rotate at different speeds. This speed difference causes the fibers to be subjected to combing forces in different directions on the needle surface between the front cylinder and the carding doffer, thereby achieving fiber combing. The fibers are initially combed and straightened on the needle surface of the front cylinder, and then transferred to the needle surface of the carding doffer. On the needle surface of the carding doffer, the fibers are further combed and evenly mixed to form a thicker fiber layer. The carding doffer gradually transfers the fiber layer to the rear cylinder, where the fiber layer is further combed to improve its straightness, and then the fiber layer on the surface of the rear cylinder is stripped by a stripping doffer which is arranged in the same direction as the needle teeth of the needle cloth of the rear cylinder. The linear speed of the rear cylinder is much greater than that of the stripping doffer. The effective area of ​​the stripping doffer is small while the relatively rotated area of ​​the rear cylinder is large. The fibers on the unit area of ​​the stripping doffer are taken from many unit areas of the rear cylinder and condensed. During the condensation process, the fibers on the rear cylinder are gradually transferred to the stripping doffer to form a fiber web. As the stripping doffer continues to rotate, the fiber web is transferred to the collecting wheel. The collecting wheel lays the fiber web on the surface of the collecting curtain to obtain a fine denier ES composite fiber layer and transport it to the coarse denier carding machine.

[0021] It should be further explained that when the fine denier ES fiber layer is laid on the surface of the collecting curtain for web laying, the random processing operation of the random condensation roller is cancelled and the cross-laying web laying method is not adopted, so that most of the fibers in the fine denier ES composite fiber layer are distributed longitudinally, which can make the fine denier ES composite fiber layer smoother after hot air bonding, and after canceling the random processing operation of the random condensation roller, the fine denier ES composite fiber layer can be laid with a lower gram weight. Based on the higher production cost of fine denier ES composite fibers, this operation can reduce the production cost of hot air non-woven fabrics.

[0022] In step S3, the fiber clusters formed by the coarse denier ES composite fibers are further broken up and mixed evenly in the coarse denier carding machine. Specifically, the fibers are hooked, stretched and combed by the needle teeth on the surfaces of the two rollers through the front cylinder and the carding doffer whose needle teeth of the card clothing are arranged in opposite directions. The fibers between the two needle tooth surfaces are partially taken away by the two needle surfaces, and the front cylinder and the carding doffer rotate at different speeds. This speed difference causes the fibers to be subjected to combing forces in different directions on the needle surface between the front cylinder and the carding doffer, thereby realizing the carding of the fibers. The fibers are preliminarily combed and straightened on the needle surface of the front cylinder, and then transferred to the needle surface of the carding doffer. On the doffer needle surface, the fibers are further combed and evenly mixed to form a thicker fiber layer. The combing doffer gradually transfers the fiber layer to the rear cylinder, where the fiber layer is further combed to improve its straightness. The fiber layer on the surface of the rear cylinder is then stripped by two stripping doffers that are arranged in the same direction as the needle teeth of the needle cloth of the rear cylinder. The linear speed of the rear cylinder is much faster than that of the stripping doffer. The effective area of ​​the stripping doffer is small, while the relatively rotated area of ​​the rear cylinder is large. The fibers on the unit area of ​​the stripping doffer are taken from many unit areas of the rear cylinder and condensed. During the condensation process, the fibers on the rear cylinder are gradually transferred to the stripping doffer to form a fiber web.

[0023] After adopting the above structure, it needs to be further explained that two stripping doffers are provided in the coarse denier carding machine, and the two stripping doffers will form two layers of fiber webs composed of coarse denier ES composite fibers. The two layers of fiber webs are formed into a coarse denier ES composite fiber layer by means of random condensation and laying. The proportion of the lateral distribution of fibers inside the coarse denier ES composite fiber layer is increased by random condensation and laying, thereby avoiding the problem of easy tearing of the hot air non-woven fabric due to insufficient lateral strength; in step S4, the coarse denier ES composite fiber layer is laid on the surface of the fine denier ES composite fiber layer to form a double-layer ES composite fiber layer, and the double-layer ES composite fiber layer is heated by hot air to melt the polyethylene on the surface of the fibers and bond them to each other to form a hot air non-woven fabric. The two sides of the hot air non-woven fabric are respectively composed of fine denier ES composite fibers and coarse denier ES composite fibers, so that the hot air non-woven fabric has good strength and fluffiness, and the side that is in direct contact with the human body is smoother and more comfortable.

[0024] As one of the preferred embodiments of the present invention, the gram weight of the hot air nonwoven fabric is 16-24gsm, and the set gram weight of the hot air nonwoven fabric of the present invention is preferably 20gsm. The hot air nonwoven fabric with this gram weight can ensure sufficient strength while having good air permeability and fluffiness; wherein, the gram weight of the fine denier ES composite fiber layer is 6-10gsm, preferably 6gsm. Since the fine denier ES composite fiber layer is formed by only one stripping doffer for stripping and then laying, and the operation of the messy treatment of the messy condensation roller is cancelled during the laying process, the fine denier ES composite fiber layer can achieve low gram weight during the laying process, and reduce the fine denier. The usage of ES composite fiber is based on the higher production cost of fine denier ES composite fiber. This method can reduce the production cost of hot air non-woven fabric; the gram weight of the coarse denier ES composite fiber layer is 10~14gsm, preferably 14gsm, and the coarse denier ES composite fiber layer is stripped by two stripping doffers and then discharged from the net. It is composed of two layers of fiber webs composed of coarse denier ES composite fibers and with a gram weight of 7gsm, so that the coarse denier ES composite fiber layer can be formed by a random condensation and laying method. The strength and fluffiness of the hot air non-woven fabric are guaranteed by the coarse denier ES composite fiber layer with a higher gram weight, thereby avoiding damage of the hot air non-woven fabric during use.

[0025] Furthermore, a double-layer ES composite fiber layer with a grammage of 20gsm is obtained by compounding a fine denier ES composite fiber layer with a grammage of 6gsm and a coarse denier ES composite fiber layer with a grammage of 14gsm. After subsequent hot air treatment, the internal fibers are adhered to each other to form a hot air non-woven fabric with a grammage of 20gsm.

[0026] As one of the preferred embodiments of the present invention, the fiber denier of the fine denier ES composite fiber is 0.4~1D. The lower the fiber denier of the fine denier ES composite fiber, the better the softness. The fiber denier of the fine denier ES composite fiber can be adaptively adjusted according to the softness requirement of the hot air non-woven fabric. Considering the physical properties and processing difficulty of the fine denier ES composite fiber, the fiber denier of the fine denier ES composite fiber of the present invention is preferably 0.8~1D; the fiber denier of the coarse denier ES composite fiber is 1.2~6D. The higher the fiber denier of the coarse denier ES composite fiber, the higher the strength. In order to avoid the coarse denier ES composite fiber from affecting the overall softness of the hot air non-woven fabric due to excessively high denier, the fiber denier of the coarse denier ES composite fiber is preferably 2~4D.

[0027] As one of the preferred embodiments of the present invention, in step S2, before the fine denier ES composite fiber layer is stripped out of the web, the doffer needs to be roller-surface cleaned and roller-surface electrostatically eliminated. Since the fine denier ES composite fiber has a lower fiber diameter and is softer and lighter, it is easier to remain on the surface of the stripping doffer. The stripping doffer needs to be roller-surface cleaned and roller-surface electrostatically eliminated. The roller surface cleaning treatment can use a brush and a negative pressure fan to remove the residual fibers on the surface of the stripping doffer. The roller surface electrostatic elimination treatment can use an electrostatic eliminator to eliminate static electricity on the surface of the stripping doffer to avoid continuous adsorption of fibers on the surface of the stripping doffer through static electricity, thereby avoiding the fine denier ES composite fibers from remaining and winding on the surface of the stripping doffer, affecting the stripping out of the fine denier ES composite fiber layer and making the fine denier ES composite fiber layer stably available at a lower gram weight.

[0028] After adopting the above structure, it needs to be further explained that in step S2, the speed of stripping the fine denier ES composite fiber layer out of the web is 80~110m / min. Since the fine denier ES composite fibers are easy to remain and wind on the surface of the stripping doffer, it is usually necessary to reduce the web speed of the fine denier ES composite fiber layer. The web speed is usually 60~70m / min, so that the fine denier ES composite fiber layer can be stripped into a web more stably. However, this operation will affect the production efficiency of the hot air non-woven fabric. After the stripping doffer is cleaned and the static electricity on the roller surface is eliminated, the fine denier ES composite fiber layer can be stably stripped into a web. Therefore, the web speed of the fine denier ES composite fiber layer can be increased to 80~110m / min, thereby improving the production efficiency of the hot air non-woven fabric.

[0029] As one of the preferred embodiments of the present invention, in step S4, the temperature at which the thermal bonding machine performs hot air bonding on the double-layer ES composite fiber layer is 110~150°C. Since the cortical structures of the fine denier ES composite fibers and the coarse denier ES composite fibers are both polyethylene with a lower melting point, the polyethylene can be converted to a molten state by heating it to 110~150°C by the thermal bonding machine, so that the internal fibers of the double-layer ES composite fiber layer are adhered and fixed to each other, and a hot air non-woven fabric with a stable structure is formed after subsequent cooling.

[0030] In summary, the hot air non-woven fabric of the present invention is composed of a fine denier ES composite fiber layer and a coarse denier ES composite fiber layer. One side of the fine denier ES composite fiber layer is set as the direct contact surface with the human body. The fine denier ES composite fiber layer is discharged through a single doffer and the messy processing operation of the messy condensation roller is eliminated during the discharge process to improve the fiber straightness, so that the direct contact surface with the human body is smoother and softer, thereby improving the comfort of the hot air non-woven fabric. The coarse denier ES composite fiber layer is composed of fibers with larger diameters, thereby ensuring the overall strength and fluffiness of the hot air non-woven fabric. The double doffer is used to strip the net and the net is laid into a net through a messy condensation laying method, thereby ensuring the lateral strength of the hot air non-woven fabric to improve durability.

[0031] The present invention is further described below by way of examples and comparative examples.

[0032] Example 1

[0033] S1. Pre-opening the fine denier ES composite fiber and the coarse denier ES composite fiber respectively, removing impurities from the two opened fibers, accurately weighing them, and then conveying them to a carding machine, wherein the fine denier ES composite fiber has a fiber denier of 0.8D, and the coarse denier ES composite fiber has a fiber denier of 2D; S2, the fine denier ES composite fiber is stripped out of the web by a fine denier carding machine single doffer, and the disorderly treatment of the disorderly condensation roller is cancelled to form a fine denier ES composite fiber layer and laid on the surface of the collecting curtain, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the fine denier ES composite fiber layer is 10:0.5, and the gram weight is 6 gsm; S3, stripping the coarse denier ES composite fiber through a coarse denier carding machine with a double doffer to form a coarse denier ES composite fiber layer after random coagulation and laying, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the coarse denier ES composite fiber layer is 5:1, and the gram weight is 14 gsm; S4. The coarse denier ES composite fiber layer is laid on the surface of the fine denier ES composite fiber layer after exiting the net to form a double-layer ES composite fiber layer on the surface of the collecting curtain. The double-layer ES composite fiber layer is thermally bonded by a thermal bonding machine, and after cooling and shaping, a hot air nonwoven fabric with a gram weight of 20 gsm is obtained.

[0034] Comparative Example 1 S1, pre-opening the fine denier ES composite fiber, removing impurities from the opened fiber, accurately weighing the fiber, and then conveying it to a carding machine, wherein the fine denier ES composite fiber has a fiber denier of 0.8D; S2, the fine denier ES composite fiber is stripped out of the web by a fine denier carding machine double doffer, and a fine denier ES composite fiber layer is formed after random coagulation and laying, and the fine denier ES composite fiber layer is laid on the surface of the collecting curtain, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the fine denier ES composite fiber layer is 5:1, and the gram weight is 20gsm; S3 and the fine denier ES composite fiber layer are thermally bonded by a thermal bonding machine, and after cooling and shaping, a hot air nonwoven fabric with a gram weight of 20 gsm is obtained.

[0035] Comparative Example 2 S1, pre-opening the coarse denier ES composite fiber, removing impurities from the opened fiber, accurately weighing the fiber, and then conveying it to a carding machine, wherein the fiber denier of the coarse denier ES composite fiber is 2D; S2, stripping the coarse denier ES composite fiber through a coarse denier carding machine double doffer to form a coarse denier ES composite fiber layer after random coagulation and laying on the surface of the collecting curtain, wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the coarse denier ES composite fiber layer is 5:1, and the gram weight is 20gsm; S3 and the coarse denier ES composite fiber layer are thermally bonded by a thermal bonding machine, and after cooling and shaping, a hot air nonwoven fabric with a gram weight of 20 gsm is obtained.

[0036] The longitudinal strength, transverse strength and surface friction coefficient of the hot air nonwoven fabrics obtained in the above embodiments and comparative examples were tested. The test results are shown in Table 1 below:

[0037] Table 1 It should be noted that the result of the surface friction coefficient is obtained by taking the average value after testing the longitudinal and transverse friction coefficients of the hot air nonwoven fabric, wherein the surface friction coefficient of Example 1 is obtained after testing the surface of the hot air nonwoven fabric that is in direct contact with the human body.

[0038] According to the data in Table 1, compared with the hot air non-woven fabric in Comparative Example 2, the surface friction coefficient of the hot air non-woven fabric in Example 1 is significantly lower, and its direct contact surface with the human body is smoother and more comfortable. Although the overall strength is poor, its strength can meet the basic requirements of sanitary products, and the gram weight of the coarse denier ES composite fiber layer can be increased to meet the higher requirements for the strength of hot air non-woven fabrics in other fields, and will not affect the smoothness of its surface; the surface friction coefficient of the hot air non-woven fabric in Comparative Example 1 is close to that in Example 1, and the surface also shows the advantages of smoothness and comfort, but the overall strength of the hot air non-woven fabric is significantly worse and is made entirely of fine denier ES composite fibers. Considering the performance and production cost of the hot air non-woven fabric, the hot air non-woven fabric obtained in Comparative Example 1 is difficult to meet the low cost and high performance requirements of producers and users for non-woven fabrics.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A production process for a double-layer ES composite fiber smooth and fluffy hot air non-woven fabric, characterized in that: The following steps are involved: S1. Pre-opening the fine denier ES composite fiber and the coarse denier ES composite fiber respectively, removing impurities from the two opened fibers, accurately weighing them, and then conveying them to a carding machine; wherein the fiber denier of the fine denier ES composite fiber is ≤1D; S2, the fine denier ES composite fiber is stripped out of the web by a fine denier carding machine single doffer, and after the disorderly treatment of the disorderly condensation roller is removed, a fine denier ES composite fiber layer is formed and laid on the surface of the collecting curtain; wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the fine denier ES composite fiber layer is 10:(0.5~1); S3, stripping the coarse denier ES composite fiber through a coarse denier carding machine with a double doffer to form a coarse denier ES composite fiber layer after random coagulation and laying; wherein the ratio of the longitudinal direction to the transverse direction of the fiber in the coarse denier ES composite fiber layer is (4-5):1; S4, after the coarse denier ES composite fiber layer comes out of the net, it is laid on the surface of the fine denier ES composite fiber layer to form a double-layer ES composite fiber layer on the surface of the collecting curtain, and the double-layer ES composite fiber layer is thermally bonded by a thermal bonding machine, and after cooling and shaping, a hot air non-woven fabric is obtained; S5, rolling, slitting and packaging the hot air nonwoven fabric to obtain a hot air nonwoven fabric roll.

2. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air non-woven fabric according to claim 1, characterized in that: The skin structure of the fine denier ES composite fiber is polyethylene and the core structure is polypropylene, and the skin structure of the coarse denier ES composite fiber is polyethylene and the core structure is polyester.

3. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: The gram weight of the hot air nonwoven fabric is 16-24 gsm.

4. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: The fine denier ES composite fiber layer has a gram weight of 6-10 gsm.

5. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: The coarse denier ES composite fiber layer has a gram weight of 10-14 gsm.

6. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: The fiber denier of the fine denier ES composite fiber is 0.4-1D, and the fiber denier of the coarse denier ES composite fiber is 1.2-6D.

7. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: In step S2, before the fine denier ES composite fiber layer is stripped off from the web, the doffer surface needs to be cleaned and static electricity eliminated.

8. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: In step S2, the speed of stripping the fine denier ES composite fiber layer out of the web is 80-110 m / min.

9. The manufacturing process of the double-layer ES composite fiber smooth and fluffy hot air nonwoven fabric according to claim 1, characterized in that: In step S4, the temperature of the thermal bonding machine for hot-air bonding the double-layer ES composite fiber layer is 110-150°C.

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