Non-woven fabric, production process thereof and drying and synchronous embossing equipment

Abstract

The invention relates to the field of non-woven fabric production, in particular to a non-woven fabric, a production process of the non-woven fabric and drying and embossing equipment, the production process of the non-woven fabric comprises a non-woven fabric forming step for reinforcing and forming fibers into the non-woven fabric, and a drying and embossing step for heating the non-woven fabric after the non-woven fabric forming step. The method comprises the following steps: heating and drying a non-woven fabric to dry moisture on the non-woven fabric, heating and drying the non-woven fabric, and performing embossing processing on the non-woven fabric in a thermal environment of heating and drying the non-woven fabric at the same time, the embossing processing is to press the non-woven fabric in a rolling mode of an embossing roller so as to form textures with a concave-convex structure on the non-woven fabric, in this way, drying heat is utilized for pattern profiling, and energy consumption in the non-woven fabric production process can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of non-woven fabric production, and specifically relates to a non-woven fabric, its production process, and a drying and synchronous embossing device. Background Art

[0002] Non-woven fabric, also known as non-woven cloth or non-woven fabric, has the characteristics of light weight, fluffiness, softness and comfort, and is widely used in the fields of medical care, hygiene products and household daily necessities.

[0003] There are various production processes for non-woven fabrics, including needling method, thermal bonding method, melt blowing method, spunlace method, wet method, etc. Among them, both the spunlace method and the wet method non-woven fabric production processes involve drying of the fabric. Taking the spunlace method non-woven fabric production process as an example, it includes fiber preparation steps, spunlace reinforcement steps, post-treatment steps, curling and cutting steps. The fiber preparation steps include the selection of fibers and the combing and arrangement into a net. The spunlace reinforcement steps include pre-wetting treatment before the fiber web enters the machine and spunlace reinforcement. Spunlace reinforcement is the core step of the spunlace non-woven fabric production process. Through the injection of high-pressure water flow, the fibers are displaced, interpenetrated and entangled, so that the fiber web is reinforced. The post-treatment steps include drying and shaping. Drying is to remove the excess moisture in the non-woven fabric through a drying device, and then shaping is carried out to make the fabric have a certain dimensional stability and physical stability. According to requirements, the post-treatment steps can also include embossing.

[0004] Embossing is to form a three-dimensional pattern with concave and convex structures on the non-woven fabric through pressing. The means that can be adopted include hot embossing. The traditional hot embossing is to hot-press the non-woven fabric after drying through a pressing roller with a relatively high temperature. This method requires pre-wetting treatment of the dried non-woven fabric before embossing and heating of the pressing roller, and there are technical problems such as high energy consumption and poor shape retention of the pattern. It is also possible to form patterns by impacting fibers with high-pressure water needles during the spunlace stage. This method will consume more water and there are also technical problems such as high energy consumption, non-three-dimensional patterns and needle leakage. Summary of the Invention

[0005] The present invention provides a non-woven fabric, its production process, and a drying and synchronous embossing device to reduce the energy consumption in the production process of non-woven fabrics.

[0006] In a first aspect, the non-woven fabric production process provided by the present invention includes:

[0007] A non-woven fabric forming step for forming fibers into a non-woven fabric by reinforcement;

[0008] Drying and embossing step: After the non-woven fabric forming step, the non-woven fabric is heated to dry the moisture on the non-woven fabric. While heating and drying the non-woven fabric, in the hot environment of heating and drying the non-woven fabric, the non-woven fabric is embossed. The embossing process is to press the non-woven fabric into a shape by rolling with an embossing roller, so as to form a texture with concave and convex structures on the non-woven fabric.

[0009] In a technical solution, the drying and embossing step includes at least two stages, namely a first stage and a second stage. The first stage is before the second stage, and in both the first stage and the second stage, the non-woven fabric is pressed into a shape by the embossing roller. The temperature T1 of heating the non-woven fabric in the first stage is higher than the temperature T2 of heating the non-woven fabric in the second stage, so as to achieve softening and shaping of the non-woven fabric in the first stage. In the second stage, the pressure P2 exerted by the embossing roller on the non-woven fabric is greater than the pressure P1 exerted by the embossing roller on the non-woven fabric in the first stage, so as to emboss and shape the non-woven fabric in the second stage.

[0010] In a technical solution, the temperature T1 of heating the non-woven fabric in the first stage is higher than the glass transition temperature of the fibers of the non-woven fabric, and the temperature T2 of heating the non-woven fabric in the second stage is lower than the glass transition temperature of the fibers of the non-woven fabric.

[0011] In a technical solution, in the first stage, the range of the temperature T1 of heating the non-woven fabric is: 145°C ≤ T1 < 160°C, and the range of the pressure P1 exerted by the embossing roller on the non-woven fabric is: 3 kPa ≤ P1 ≤ 10 kPa.

[0012] In a technical solution, in the second stage, the range of the temperature T2 of heating the non-woven fabric is: 110°C ≤ T2 ≤ 130°C, and the range of the pressure P2 exerted by the embossing roller on the non-woven fabric is: 12 kPa ≤ P1 ≤ 20 kPa.

[0013] In a technical solution, in the drying and embossing step, the non-woven fabric is heated by blowing hot air to the position where the non-woven fabric is located.

[0014] In a second aspect, the present invention provides a non-woven fabric, which is produced by the non-woven fabric production process in the above technical solutions, so as to form a pattern on the non-woven fabric.

[0015] In a third aspect, the present invention provides a drying and synchronous embossing device, which is used to be arranged after the non-woven fabric forming device on the non-woven fabric production line. The non-woven fabric forming device is used to reinforce and form fibers into a non-woven fabric. The drying and synchronous embossing device includes:

[0016] A box body, having an inner cavity, an inlet and an outlet communicating with the inner cavity, the inlet being used for feeding the non-woven fabric into the inner cavity, and the outlet being used for outputting the dried non-woven fabric;

[0017] A heating structure, configured to heat the inner cavity to form a thermal environment for heating and drying the non-woven fabric entering the inner cavity;

[0018] A embossing roller, arranged in the inner cavity, for embossing the non-woven fabric to form a texture with a concave-convex structure on the non-woven fabric.

[0019] In one technical solution, a partitioning structure is provided in the box body, the partitioning structure divides the box body into at least two compartments, each compartment is provided with the heating structure and the embossing roller, so as to be able to independently control the temperature in each compartment, and emboss the non-woven fabric in each compartment. The partitioning structure is provided with a channel, so that the non-woven fabric can sequentially enter each compartment.

[0020] In one technical solution, the heating temperature of the inner cavity by the heating structure is adjustable, and the pressure of the embossing roller on the non-woven fabric is adjustable.

[0021] The beneficial effects of the present invention are as follows:

[0022] While heating and drying the formed non-woven fabric, by means of the drying thermal environment, the embossing roller is used to emboss the non-woven fabric synchronously. Compared with the traditional method of embossing the non-woven fabric with an embossing roller with a relatively high temperature after drying the non-woven fabric, the heating of the embossing roller can be omitted, achieving energy saving; in the non-woven fabric production process of the present invention, if the spunlace method is used for reinforcement in the non-woven fabric forming step, compared with the process of forming patterns in the spunlace stage, the present invention can reduce the water consumption and the spunlace pressure in the spunlace stage, and can also achieve energy saving. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a drying and synchronous embossing device in an embodiment of the present invention.

[0024] List of the corresponding feature names of the reference numerals in the drawings:

[0025] 1. Box body; 11. First compartment; 12. Second compartment; 13. First heating structure; 14. First embossing roller group; 15. Second heating structure; 16. Second embossing roller group; 17. Drag net; 2. Fabric conveyor; 3. Non-woven fabric; 4. Partitioning structure. Detailed Embodiments

[0026] The present application will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0027] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operation steps involved in each embodiment can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the specification and the drawings are only for clearly describing a certain embodiment and do not mean that they are essential components and / or sequences.

[0028] The serial numbers assigned to the components in this document, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0029] In an embodiment of the present invention, while heating and drying the non-woven fabric, in the hot environment of heating and drying, a corrugating roller is used to synchronously perform a corrugating process on the non-woven fabric, forming a texture with a concave-convex structure on the non-woven fabric. In this way, there is no need to additionally heat the corrugating roller for corrugating, reducing the energy consumption in the production process of the patterned non-woven fabric. Moreover, if the non-woven fabric is a spunlace non-woven fabric, the non-woven fabric production process in the present invention can reduce the water consumption in the spunlace stage and also achieve a reduction in energy consumption.

[0030] An embodiment of the non-woven fabric production process in the present invention:

[0031] In one embodiment, taking the production of all-cotton spunlace non-woven fabric as an example, the non-woven fabric production process in the present invention is introduced. Specifically, the all-cotton spunlace non-woven fabric production process includes: cotton bale opening - cleaning - impurity removal - carding - web forming - spunlace - winding - decolorizing - drying and corrugating - slitting - packing.

[0032] Among them, in the carding and web forming steps, the cotton fibers are arranged in a net-like structure through the carding process to form a uniform fiber web. During the carding process, the cotton fibers are refined and oriented, laying a foundation for subsequent spunlace reinforcement.

[0033] Hydroentangling is the core step in the production of hydroentangled nonwovens. In this step, high-pressure water jets are sprayed onto the fiber web at extremely high speeds through nozzles. Under the action of the water flow, the cotton fibers are displaced, interpenetrated, and entangled, forming countless flexible entanglement points, thereby strengthening the fiber web and shaping it into nonwovens. As those skilled in the art know, during the hydroentangling process, parameters such as the water pressure, spraying angle, and spraying frequency can be adjusted according to the requirements of the product.

[0034] The cotton fibers are formed into nonwovens through carding, web laying, and hydroentangling. Therefore, in the present invention, the carding, web laying, and hydroentangling stages are collectively referred to as the nonwoven forming step, aiming to express that in the production process of nonwovens, there is such a step of strengthening and shaping the fibers into nonwovens.

[0035] Of course, as those skilled in the art can understand, other nonwoven production processes also have their corresponding nonwoven forming steps. For example, in the wet nonwoven production process, the nonwoven forming step is to transport the prepared fiber suspension to the web-forming mechanism and form a fiber web by web-forming in the wet state. After forming the fiber web, dehydration is carried out to make the fiber web more compact and stable.

[0036] After hydroentangling and forming, the nonwovens contain a large amount of water, and even after subsequent desizing and bleaching, the nonwovens still contain a large amount of water. Therefore, it is necessary to dry the nonwovens. Embossing the nonwovens is to form concave-convex textured patterns on the nonwovens. Here, the texture can refer to patterns, words, etc.

[0037] In the present invention, drying and embossing are carried out synchronously. Therefore, the production process of all-cotton hydroentangled nonwovens of the present invention has a drying and embossing step. The drying and embossing step is after the nonwoven forming step. In some embodiments, specifically after the desizing and bleaching step, the nonwovens are dried and embossed to dry the moisture formed on the nonwovens during the strengthening and forming step and the desizing and bleaching step. Desizing and bleaching are only applicable to hydroentangled nonwovens made of raw cotton fibers. For nonwoven production processes without a desizing and bleaching step, the drying and embossing step dries the moisture generated during the strengthening stage, such as viscose fiber hydroentangled nonwovens and wood pulp wet production processes.

[0038] The drying and embossing step specifically forms a hot environment through heating. The nonwovens with moisture pass through the hot environment and are baked and heated to remove the moisture. Since the temperature of the hot atmosphere for drying the nonwovens is relatively high, during drying, the embossing roller is used to emboss the nonwovens being dried and heated in the hot atmosphere to form concave-convex textured patterns on the nonwovens, greatly reducing the energy consumption during the production of patterned nonwovens.

[0039] In order to make the embossing depth deeper and the pattern have higher stability, in some embodiments, the drying and embossing steps are divided into at least two stages, before and after. Here, taking the division into two stages as an example for introduction, the first stage is in the front and the second stage is in the back. And in both the first stage and the second stage, the non-woven fabric is embossed by an embossing roller. The temperature T1 for heating the non-woven fabric in the first stage is higher than the temperature T2 for heating the non-woven fabric in the second stage, so as to initially soften and shape the fibers of the non-woven fabric in the first stage and achieve micro-melting bonding of the fibers. The micro-melting bonding here refers to the softening of the amorphous region of the fibers. In the second stage, the pressure P2 applied by the embossing roller to the non-woven fabric is greater than the pressure P1 applied by the embossing roller to the non-woven fabric in the first stage, so as to emboss the non-woven fabric to a fixed depth in the second stage. In this way, thermal gradient forming can be achieved.

[0040] The thermal decomposition starting temperature of cotton fibers (cellulose) is greater than or equal to 160 °C, and the glass transition temperature (Tg): the starting temperature of the molecular chain segments in the amorphous region is about 128 °C (the glass transition temperature of cotton fibers is different in different cases). Combining the characteristics of cotton fibers themselves, in some embodiments, the value of the temperature T1 for heating the all-cotton non-woven fabric in the first stage is 150 °C, and the pressure P1 applied by the corresponding embossing roller to the all-cotton non-woven fabric is controlled to be 5 kPa. At this temperature, the moisture on the surface of the all-cotton non-woven fabric is quickly evaporated for rapid drying and dehydration. The 150 °C thermal environment in the first stage is close to the softening point of cotton fibers but lower than the decomposition temperature, only triggering the softening of the amorphous region of cotton fibers, making the cellulose molecular chain segments relax, that is, realizing the softening of cotton fibers. The fiber glass transition temperature (Tg) is broken through, and the fiber enters the high elastic state and has plasticity. A low pressure (5 kPa) applies a gentle pressure to the fibers to avoid fiber breakage or carbonization caused by excessive compression at high temperatures, and at the same time guides the fibers to be initially oriented and arranged to form an embossing prototype. In this stage, the all-cotton non-woven fabric is initially embossed, and only shallow marks are embossed on the surface of the all-cotton non-woven fabric.

[0041] The value of the temperature T2 for heating the all-cotton non-woven fabric in the second stage is 120 °C, and the pressure P2 applied by the corresponding embossing roller to the all-cotton non-woven fabric is controlled to be 15 kPa. This temperature drops below the fiber Tg, and the fiber changes from the high elastic state to the glass state. At this temperature and pressure, it promotes the hydrogen bond cross-linking and curing of the pattern of the fibers. The high pressure (15 kPa) can force the fibers to undergo permanent displacement in the solid state to form a clear and stable embossed structure. The high pressure is applied after the fibers are cooled to avoid problems such as sticking to the roller or fiber adhesion caused by high pressure at high temperatures. At the same time, using the rigidity of the fibers in the solid state to improve the embossing accuracy, while realizing the embossing setting, the natural characteristics of cotton fibers are completely retained. In this stage, the final forming of the pattern is achieved.

[0042] Thus, the non-woven fabric evaporates moisture in a hot environment, and the embossing roller applies pressures of 5 kPa and 15 kPa to the fabric surface, causing the cotton fibers to be directionally reorganized in a hot and humid state to form a permanent embossing, an amorphous region melting-mechanical anchoring structure, ensuring the stability of the embossing pattern. During the drying step, an embossing pressure is synchronously applied in a high-temperature (100°C - 150°C) environment, eliminating the need for an independent embossing step. The energy consumption in the production stage of the non-woven fabric is lower, with the energy consumption reduced by 25% - 40%. The pattern structure is more stable. The drying temperature (higher than the traditional embossing temperature) reduces the glass transition temperature (Tg) of the cotton fibers, making the cotton fibers more prone to plastic deformation, and the embossing depth can be increased by 30% - 50%. Synchronous drying and embossing can avoid the embossing rebound caused by the secondary moisture absorption of the non-woven fabric, improving the pattern stability.

[0043] Moreover, in the traditional roll-forming pattern, after the drying step, a hot embossing roller is used to emboss the non-woven fabric. The temperature of the embossing roller generally does not exceed 120°C. The temperature in the drying stage is higher than the temperature of the embossing roller itself in the traditional roll-forming pattern. Therefore, in the drying and embossing step of the non-woven fabric production process of the present invention, the strength requirement for the non-woven fabric is lower, and it can reversely reduce the water consumption in the hydroentangling stage. And compared with the hydroentangling embossing process, it does not require water jets to spray water, only heat and pressure are used to achieve embossing without water. Compared with chemical bonding embossing, it can reduce chemical residue and improve the safety of the fabric.

[0044] In some other embodiments, the temperature T1 in the first stage can be lower than 150°C, such as it can be as low as 145°C, or it can be higher than 150°C, but it cannot reach 160°C to prevent the thermal decomposition of the cotton fibers. In this stage, the pressure P1 applied by the corresponding embossing roller to the fabric surface of the non-woven fabric can also be lower than 5 kPa, such as as low as 3 kPa, or it can be higher than 5 kPa, such as 10 kPa.

[0045] In some other embodiments, the temperature T2 in the second stage can be lower than 120°C, such as it can be as low as 110°C, or it can be higher than 120°C, such as it can be 130°C. In this stage, the pressure P2 applied by the corresponding embossing roller to the fabric surface of the non-woven fabric can also be lower than 15 kPa, such as as low as 12 kPa, or it can be higher than 15 kPa, such as 20 kPa.

[0046] Since the temperature nodes such as the decomposition temperature and glass transition temperature of fibers of different materials are different, in different embodiments, for the fiber material of the corresponding non-woven fabric, the heating temperatures in the first stage and the second stage can be set correspondingly. The goal is that in the first stage, the rapid evaporation of moisture on the non-woven fabric and the softening of the fibers can be achieved, but fiber decomposition does not occur. The corresponding embossing reduction amount is also to perform preliminary embossing on the premise of not breaking the fibers. The heating temperature in the second stage is lower than that in the first stage, but the reduction amount, that is, the pressure applied by the embossing roller to the non-woven fabric, increases, enabling the embossing and shaping of the non-woven fabric.

[0047] The present invention also provides a non-woven fabric, which is produced by using the non-woven fabric production process in the above-mentioned embodiments, so as to produce a non-woven fabric with patterns in a way with lower energy consumption.

[0048] Embodiment of the drying and synchronous embossing device in the present invention:

[0049] This drying and synchronous embossing device is applied to a non-woven fabric production line. The non-woven fabric production line has a non-woven fabric forming device, which is used to reinforce and form fibers into a non-woven fabric. For different non-woven fabric production methods, the structures of their non-woven fabric forming devices are different. For example, in a spunlace non-woven fabric production line, the corresponding non-woven fabric forming device is mainly a device for achieving spunlace reinforcement. For the non-woven fabric forming device in a wet non-woven fabric production line, it is mainly a web-forming mechanism for forming fibers into a web in a wet state. The drying and synchronous embossing device is arranged after the non-woven fabric forming device in the non-woven fabric production line to evaporate and dry the moisture carried by the non-woven fabric after passing through the non-woven fabric forming device and / or desizing and bleaching.

[0050] Please refer to Figure 1 , the drying and synchronous embossing device includes a box body 1. A fabric conveyor 2 is arranged on the front side of the box body 1. The box body 1 has an inner cavity and an inlet and an outlet communicating with the inner cavity. The non-woven fabric 3 with moisture after the previous step of processing is conveyed through the fabric conveyor 2 and enters the inner cavity of the box body 1 through the inlet, and the outlet is used to output the dried non-woven fabric 3.

[0051] In order to form a thermal environment in the inner cavity, the drying and synchronous embossing device further includes a heating structure, which heats the inner cavity through the heating structure to form a thermal environment, so that the non-woven fabric 3 entering the inner cavity can be heated and dried.

[0052] Regarding the specific form of the heating structure, it can be any heating structure applicable in the prior art. For example, it can be a heating structure that blows hot air into the inner cavity. The hot air blown into the inner cavity of the box body 1 by such a heating structure can penetrate the non-woven fabric 3 for drying. The heating structure can also be an electric heating wire arranged on the inner wall of the box body 1.

[0053] A embossing roller is also arranged in the box body 1 to synchronously emboss the non-woven fabric 3 in the thermal environment, so as to form concave and convex textured patterns on the non-woven fabric 3.

[0054] In some embodiments, the box body 1 has a partition structure 4. The partition structure 4 divides the box body 1 into at least two compartments. Each compartment has a heating structure and an embossing roller, so as to be able to independently control the temperature in each compartment and emboss the non-woven fabric 3 in each compartment. The partition structure 4 has channels, so that the non-woven fabric 3 can enter each compartment in sequence.

[0055] Please refer to Figure 1, in some embodiments, the partition structure 4 divides the inner cavity of the box body 1 into a first compartment 11 and a second compartment 12. The first compartment 11 is provided with a first heating structure 13 and a first embossing roller group 14, and the second compartment 12 is provided with a second heating structure 15 and a second embossing roller group 16. During production, the non-woven fabric 3 first passes through the first compartment 11 and then through the second compartment 12.

[0056] Such a drying and synchronous embossing device can implement the drying and embossing steps in the non-woven fabric production process in the above embodiments. Through the cooperation of different temperatures and pressing amounts in different stages, embossing processing with a larger pressing amount for the non-woven fabric 3 can be achieved, and better stability of the embossing can be ensured. At the same time, equipment intensification is also realized, eliminating the independent embossing unit, shortening the length of the non-woven fabric production line by 20%, and reducing the floor area.

[0057] In order to ensure that the non-woven fabric 3 has sufficient drying time, a drag net 17 is also provided in the box body 1. The drag net 17 is composed of multiple layers of circulating mesh belts. The non-woven fabric 3 bends repeatedly along the drag net 17 to extend the walking path of the non-woven fabric 3 in the box body 1 and extend the drying time.

[0058] In order to be able to process non-woven fabrics 3 with different thicknesses, the temperature of each heating structure for heating the corresponding compartment is adjustable, and the height of the embossing roller is also adjustable to be able to change the pressure exerted by the embossing roller on the non-woven fabric 3.

[0059] In some embodiments, the base material of the embossing roller is stainless steel, the mesh density is 20 - 80 meshes, the target pattern is laser engraved on the surface, the depth is 0.2 - 0.5 mm, and the roller surface is coated with a high-temperature resistant ceramic coating such as Al2O3 with a thickness of 50 - 100 μm to prevent fiber sticking to the roller. The embossing roller can be adjusted in height by a pneumatic method, and the pressure exerted by the roller surface on the non-woven fabric 3 is controlled by an external air pump to adapt to the processing of non-woven fabrics 3 with different grammages (30 - 100 g / m 2 )

[0060] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art of the present invention, based on the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A non-woven fabric production process, characterized in that, Including: A non-woven fabric forming step for forming fibers into a non-woven fabric by reinforcement. A drying and embossing step, after the non-woven fabric forming step, heating the non-woven fabric to dry the moisture on the non-woven fabric, and while heating and drying the non-woven fabric, in the hot environment of heating and drying the non-woven fabric, performing embossing processing on the non-woven fabric, and the embossing processing is to press the non-woven fabric into a shape by rolling with an embossing roller, so as to form a texture with a concave-convex structure on the non-woven fabric.

2. The non-woven fabric production process according to claim 1, characterized in that The drying and embossing step includes at least two stages, one stage is the first stage and one stage is the second stage. The first stage is before the second stage, and in both the first stage and the second stage, the non-woven fabric is pressed into a shape by the embossing roller. The temperature T1 for heating the non-woven fabric in the first stage is higher than the temperature T2 for heating the non-woven fabric in the second stage, so as to achieve softening and shaping of the non-woven fabric in the first stage. In the second stage, the pressure P2 applied by the embossing roller to the non-woven fabric is greater than the pressure P1 applied by the embossing roller to the non-woven fabric in the first stage, so as to emboss and shape the non-woven fabric in the second stage.

3. The non-woven fabric production process according to claim 2, characterized in that, The temperature T1 for heating the non-woven fabric in the first stage is higher than the glass transition temperature of the fibers of the non-woven fabric, and the temperature T2 for heating the non-woven fabric in the second stage is lower than the glass transition temperature of the fibers of the non-woven fabric.

4. The non-woven fabric production process according to claim 2 or 3, characterized in that, In the first stage, the range of the temperature T1 for heating the non-woven fabric is: 145°C ≤ T1 < 160°C, and the range of the pressure P1 applied by the embossing roller to the non-woven fabric is: 3 kPa ≤ P1 ≤ 10 kPa.

5. The non-woven fabric production process according to claim 4, characterized in that, In the second stage, the range of the temperature T2 for heating the non-woven fabric is: 110°C ≤ T2 ≤ 130°C, and the range of the pressure P2 applied by the embossing roller to the non-woven fabric is: 12 kPa ≤ P1 ≤ 20 kPa.

6. The non-woven fabric production process according to any one of claims 1-3, characterized in that, In the drying and embossing step, the non-woven fabric is heated by blowing hot air to the position where the non-woven fabric is located.

7. A non-woven fabric, characterized in that, The non-woven fabric is produced by the non-woven fabric production process according to any one of claims 1-6 to form a pattern on the non-woven fabric.

8. A drying and synchronous embossing device, characterized in that, It is used to be arranged after a non-woven fabric forming device on a non-woven fabric production line. The non-woven fabric forming device is used to form fibers into a non-woven fabric by reinforcement. The drying and synchronous embossing device includes: A box body having an inner cavity and an inlet and an outlet communicating with the inner cavity. The inlet is used for the non-woven fabric to enter the inner cavity, and the outlet is used for outputting the dried non-woven fabric. A heating structure for heating the inner cavity to form a hot environment to heat and dry the non-woven fabric entering the inner cavity. An embossing roller arranged in the inner cavity for embossing the non-woven fabric to form a texture with a concave-convex structure on the non-woven fabric.

9. The drying and synchronous embossing device according to claim 8, wherein, The box body has a partition structure, which divides the box body into at least two compartments. Each compartment is provided with the heating structure and the embossing roller, so as to be able to independently control the temperature in each compartment and emboss the non-woven fabric in each compartment. The partition structure has a channel, so that the non-woven fabric can sequentially enter each compartment.

10. The drying and synchronous embossing device according to claim 8 or 9, characterized in that The heating temperature of the heating structure for the inner cavity is adjustable, and the pressure of the embossing roller on the non-woven fabric is adjustable.

Images