Steam heat treatment equipment and process for nonwoven fabrics

Abstract

The present invention discloses a steam heat treatment device and process for non-woven fabrics, comprising: a workbench, an unwinding roller and a winding roller arranged on the upper part of the workbench, and a heat treatment mechanism arranged between the unwinding roller and the winding roller; the unwinding roller and the winding roller are respectively arranged at both ends of the workbench, and the two ends of the non-woven fabric are respectively wound on the unwinding roller and the winding roller. The present invention is provided with an unwinding roller, a winding roller and a heat treatment mechanism, and the non-woven fabric is steam-heat-treated by the heat treatment mechanism under the cooperation of the unwinding roller and the winding roller, and the structural design of the heat treatment roller enables the steam to be directly sprayed onto the non-woven fabric through the steam injection hole and the guide path on the hemispherical slide rod when the non-woven fabric is squeezed, thereby realizing local efficient heat treatment of the non-woven fabric, enhancing the fiber bonding of the key parts of the non-woven fabric used to prepare medical and sanitary products such as nurse uniforms and masks, and improving the strength, stability and wear resistance of these areas.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric processing, specifically to making steam forcibly penetrate textile materials to obtain a processing effect, and in particular to a steam heat treatment device and process for non-woven fabrics. Background Art

[0002] Nonwoven fabrics, also known as nonwoven fabrics or non-woven fabrics, are unique textiles that are directly composed of directional or randomly arranged fibers. The production process abandons the traditional spinning and weaving process and instead adopts advanced methods such as mechanical reinforcement, thermal bonding or chemical bonding to achieve effective agglomeration of fibers into fabrics. Due to its diverse and excellent performance, nonwoven fabrics have shown a wide range of application value in many fields.

[0003] In the medical and health field, especially in the manufacture of key protective equipment such as nurse uniforms and masks, non-woven fabrics, as core materials, need to undergo special treatment to enhance their performance. Specifically, the use of local steam heat treatment technology in the mask nose bridge fitting area, edge areas, and nurse uniform cuffs and collars, which are vulnerable or need to be strengthened, can effectively promote the close bonding between fibers and significantly improve the strength and structural stability of these key areas. In addition, local steam heat treatment of the filter layer of the filter material can build a denser fiber network, thereby optimizing the filtration efficiency and accuracy to meet higher-level filtration needs.

[0004] However, the existing technology still lacks steam heat treatment equipment designed specifically for such local strengthening needs. Traditional practices mostly rely on additional reinforcement layers to achieve local reinforcement. Although this method is feasible, it has limitations in efficiency and effectiveness.

[0005] Therefore, it is necessary to provide a steam heat treatment device and process for non-woven fabrics to solve the above technical problems. Summary of the invention

[0006] The invention overcomes the shortcomings of the prior art and provides a steam heat treatment device and process for non-woven fabrics.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a steam heat treatment device for non-woven fabrics, comprising: a workbench, a reeling roller and a reeling roller arranged on the upper part of the workbench, and a heat treatment mechanism arranged between the reeling roller and the reeling roller; the reeling roller and the reeling roller are respectively arranged at two ends of the workbench, and the two ends of the non-woven fabrics are respectively wound around the reeling roller and the reeling roller;

[0008] The heat treatment mechanism comprises: a steam generator, and a plurality of heat treatment rollers arranged on the upper part of the workbench; the heat treatment roller comprises: a roller body, a steam storage chamber provided inside the roller body, a plurality of grooves provided on the outer surface of the roller body, and a hemispherical slide bar provided in the groove; the steam storage chamber is connected to the steam generator through a pipeline; a support plate is arranged on the upper part of the workbench, and a gap is left between the support plate and the heat treatment roller for non-woven fabric to pass through;

[0009] The interior of the groove is provided with a telescopic member connected to the outer surface of the hemispherical slide rod, a limiting ring is provided at the outlet edge of the groove, and the outer surface of the hemispherical slide rod abuts against the limiting ring; a plurality of steam injection holes are provided on the inner wall of the groove, and a steam guide channel is provided between the steam injection holes and the steam storage chamber; when the outer surface of the hemispherical slide rod abuts against the limiting ring, the outer surface of the hemispherical slide rod blocks the orifice position of the steam injection hole;

[0010] The outer surface of the hemispherical slide bar is provided with a plurality of guide paths. When the hemispherical slide bar contacts the non-woven fabric and is squeezed and received in the groove, the guide paths are in the same straight line as the axis of the steam injection hole, and the ends of the plurality of guide paths away from the steam injection hole are all facing the non-woven fabric.

[0011] In a preferred embodiment of the present invention, the groove is cylindrical, the inner end of the hemispherical slide rod is a cylinder, and the outer end is a hemispherical body with the same diameter as the inner end, and the outer surface of the inner end of the hemispherical slide rod is slidably connected to the inner wall of the groove.

[0012] In a preferred embodiment of the present invention, a first mounting plate and a second mounting plate are provided on the upper surface of the workbench, the support plate is provided in the middle of the first mounting plate and the second mounting plate, and the support plate is horizontally provided, and a first guide roller and a second guide roller are provided at both ends of the support plate, respectively; a heat treatment cover plate is provided at the upper end of the second mounting plate, one end of the heat treatment cover plate is fixedly connected to the inner side of the first mounting plate, and the heat treatment roller is provided on the inner side of the heat treatment cover plate.

[0013] In a preferred embodiment of the present invention, a plurality of the steam injection holes are symmetrically arranged, the steam injection holes correspond one-to-one to the guide paths, and a plurality of the guide paths overlap toward one end of the non-woven fabric and are located at the bottom center of the hemispherical slide rod; the angle between the straight line where the axis of the steam injection hole and the guide path is located and the axis of the groove is 30 to 40°.

[0014] In a preferred embodiment of the present invention, a plurality of downwardly inclined depressions are provided on the upper surface of the support plate, and the downward end of the depression is close to the unwinding roller, the depression is rectangular, semicircular or semi-elliptical, and the plane faces upward; an elastic sheet is provided above the depression, the height of the elastic sheet gradually increases along the conveying direction of the non-woven fabric, and the upper opening of the depression faces the winding roller; air guide holes are provided at the bottom of the depression, and an exhaust device connected to the plurality of air guide holes is provided below the support plate.

[0015] In a preferred embodiment of the present invention, a driving mechanism connected to the heat treatment roller is arranged on the workbench, and the driving mechanism includes: a servo motor arranged on the workbench, a first sprocket arranged at the output end of the servo motor, a second sprocket arranged on the side wall of the heat treatment cover plate, and a driving gear arranged on the shaft where the heat treatment roller is located; the first sprocket is connected to the second sprocket through a chain, a half gear is arranged on one side of the second sprocket, and the tooth portion of the half gear is meshingly connected with the driving gear.

[0016] In a preferred embodiment of the present invention, a third sprocket is provided on one side of the second sprocket, and the third sprockets on adjacent heat treatment rollers are connected via a chain transmission.

[0017] In a preferred embodiment of the present invention, the heat treatment roller further comprises: an insulating cavity arranged around the steam storage cavity and the groove, the insulating cavity being arranged between the steam storage cavity and the groove and the roller body, and the insulating cavity being filled with ceramic fibers or aerogel.

[0018] A steam heat treatment process for nonwoven fabrics, based on the steam heat treatment equipment for nonwoven fabrics described in any one of the above, comprises the following steps:

[0019] S1. Wind one end of the non-woven fabric to be treated on the unwinding roller, and the other end passes through the gap between the support plate and the heat treatment roller, and is wound on the winding roller. The tension of the non-woven fabric is controlled at 30-50N.

[0020] S2. Start the steam generator to generate sufficient steam, which is then transported to the steam storage chambers of the heat treatment rollers through pipelines. The temperature of the steam is 170-180°C and the pressure is 0.7-0.9MPa.

[0021] S3, start the servo motor, drive the second sprocket to rotate through the first sprocket and the chain, drive the heat treatment roller to rotate intermittently through the intermittent transmission of the half gear and the driving gear, and each time the heat treatment roller rotates, a row of hemispherical slide bars corresponding to the heat treatment roller is vertically oriented toward the non-woven fabric and squeezed into the groove, and steam is ejected through a number of steam injection holes and directly injected onto the non-woven fabric through the guide channel to perform steam heat treatment on the local area. At the same time, the winding roller rotates at a uniform speed, driving the non-woven fabric to move forward;

[0022] S4. Start the exhaust device under the support plate, and the steam that passes through the non-woven fabric is extracted through the depressions and air guide holes on the support plate.

[0023] In a preferred embodiment of the present invention, in said S3, two front and rear heat treatment rollers are used, and the distribution of grooves on the two heat treatment rollers is different, so that steam heat treatment is performed on different areas of the non-woven fabric respectively.

[0024] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0025] (1) The present invention provides a steam heat treatment device for non-woven fabrics, which is provided with an unwinding roller, a winding roller and a heat treatment mechanism. The non-woven fabric is steam-heat treated by the heat treatment mechanism under the cooperation of the unwinding roller and the winding roller. The structural design of the heat treatment roller enables steam to be directly sprayed onto the non-woven fabric through the steam injection hole and the guide path on the hemispherical slide bar when the non-woven fabric is squeezed by the hemispherical slide bar, thereby realizing local and efficient heat treatment of the non-woven fabric, enhancing the fiber bonding of the key parts of the non-woven fabric used to prepare medical and sanitary products such as nurse uniforms and masks, and improving the strength, stability and wear resistance of these areas. Compared with the prior art, steam treatment acts more accurately and concentratedly on the area of ​​the non-woven fabric that needs to be treated, reducing steam loss.

[0026] (2) The present invention provides a heat treatment roller, the surface of which is provided with a plurality of grooves, the grooves are provided with a hemispherical slide bar and a telescopic part connected to the surface of the hemispherical slide bar, the outlet edge of the groove is provided with a limit ring, the outer surface of the hemispherical slide bar abuts against the limit ring; the inner wall of the groove is provided with a plurality of steam injection holes, when the outer surface of the hemispherical slide bar abuts against the limit ring, the hemispherical slide bar blocks the orifice position of the steam injection hole, when the hemispherical slide bar on the heat treatment roller does not contact the non-woven fabric, steam will not be ejected, and when the hemispherical slide bar is vertically oriented toward the non-woven fabric and is squeezed, steam injection will be triggered. The present invention not only reduces energy waste, but also can realize precise steam heat treatment of parts of the non-woven fabric by controlling the transmission speed of the non-woven fabric and the rotation speed of the heat treatment roller, and even the design of the groove position.

[0027] (3) The present invention provides a heat treatment roller, and a plurality of guide paths are provided on the outer surface of the hemispherical slide bar. When the hemispherical slide bar contacts the non-woven fabric and is squeezed and received in the groove, the guide paths are in the same straight line as the axis of the steam injection hole. The ends of the plurality of guide paths away from the steam injection hole are all oriented toward the non-woven fabric and overlap, and are located at the bottom center of the hemispherical slide bar. The steam ejected from the plurality of steam injection holes of the present invention is gathered at one outlet through the guide paths and ejected onto the surface of the non-woven fabric. The above structural design can effectively enhance the concentration effect of the steam, and form a higher pressure and temperature at the steam outlet of the guide paths, thereby improving the steam heat treatment effect on the non-woven fabric.

[0028] (4) The present invention provides a support plate, and a gap is left between the support plate and the heat treatment roller for the non-woven fabric to pass through. The upper surface of the support plate is provided with a plurality of depressions inclined downward, and the downward end of the depression is close to the unwinding roller. The depression is rectangular, semicircular or semi-elliptical, and the plane is upward. An elastic sheet is provided above the depression, and the height of the elastic sheet gradually increases along the conveying direction of the non-woven fabric. The upper opening of the depression faces the winding roller. The non-woven fabric maintains contact with the upper surface of the support plate during the conveying process, thereby ensuring the flatness of the non-woven fabric during the conveying process. The non-woven fabric is conveyed in the same direction as the upper opening of the depression and contacts with the upper surface of the elastic sheet, rather than vertically contacting with the depression, thereby reducing the friction between the non-woven fabric and the depression during the conveying process, thereby reducing material wear and fiber damage. Furthermore, even if the hemispherical slide bar squeezes the non-woven fabric in the vertical direction and then squeezes on the elastic sheet, the elastic sheet deforms downward and is separated between the non-woven fabric and the depression, and the non-woven fabric will not sink into the depression.

[0029] Furthermore, air guide holes are provided at the bottom of the depression, and an exhaust device connected to the air guide holes is provided below the support plate. In the present invention, the exhaust direction from the depression 51 is opposite to the conveying direction of the non-woven fabric, which helps to maintain the flatness of the non-woven fabric during the conveying process, because the exhaust will not directly generate suction on the surface of the non-woven fabric, reducing the risk of wrinkles or deformation of the non-woven fabric due to wind force. Compared with the vertical exhaust in the prior art, the vertical exhaust will generate direct suction on the surface of the non-woven fabric, which will cause the surface of the non-woven fabric to be uneven or sucked into the exhaust holes.

[0030] (5) The heat treatment roller of the present invention also includes: a heat insulation chamber arranged around the steam storage chamber and the groove, the heat insulation chamber is arranged between the steam storage chamber and the groove and the roller body, and the heat insulation chamber is filled with ceramic fibers or aerogel. The design of the heat insulation chamber in the present invention isolates the steam heat in the steam storage chamber and the groove, maintains the surface of the heat treatment roller at normal temperature, and prevents the heat treatment roller from performing rolling heat treatment on the rest of the non-woven fabric.

[0031] (6) The present invention is provided with a driving mechanism connected to the heat treatment roller, and adopts an intermittent transmission mechanism of a servo motor, a sprocket, and a half gear, so that the heat treatment roller can rotate intermittently. Each time it rotates, the hemispherical slide bar is vertically oriented toward the non-woven fabric and is squeezed, thereby triggering steam injection. The present invention realizes size and position control of local heat treatment on the surface of the non-woven fabric by controlling the speed of the servo motor and designing the half gear structure.

[0032] (7) The present invention provides a steam heat treatment process for non-woven fabrics, which can achieve continuous local steam heat treatment of non-woven fabrics. The intermittent rotation of the heat treatment roller and the vertical orientation design of the hemispherical slide bar enable the steam to effectively act on the non-woven fabric each time it rotates, thereby enhancing the intensity and depth of the local heat treatment. While the heat treatment is being carried out, the steam that has passed through the non-woven fabric is promptly extracted through the exhaust device under the support plate. In addition, by using two front and rear heat treatment rollers with different distributions of grooves on the two rollers, different areas of the non-woven fabric can be steam-heat treated respectively, thereby making up for the problem that two local areas that are very close to each other cannot be steam-heat treated on the same heat treatment roller due to insufficient space on the heat treatment roller. Furthermore, the same position can be steam-heat treated on both sides to deepen the effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a three-dimensional structural diagram of a preferred embodiment of the present invention;

[0035] Figure 2 is a three-dimensional structural diagram of a heat treatment roller according to a preferred embodiment of the present invention;

[0036] Figure 3 is a cross-sectional structural diagram of a heat treatment roller of a preferred embodiment of the present invention;

[0037] Figure 4 is a three-dimensional structural diagram of a hemispherical slide bar of a preferred embodiment of the present invention;

[0038] Figure 5 is a top view of a support plate of a preferred embodiment of the present invention;

[0039] Figure 6 is a cross-sectional structural diagram of a support plate of a preferred embodiment of the present invention;

[0040] Figure 7 It is a preferred embodiment of the present invention Figure 1 Enlarged view of local A;

[0041] Figure 8 It is a process flow chart of a preferred embodiment of the present invention.

[0042] In the figure: 1. workbench; 2. unwinding roller; 3. winding roller; 4. heat treatment roller; 41. roller body; 42. steam storage chamber; 43. groove; 44. hemispherical slide rod; 45. telescopic member; 46. limiting ring; 47. steam injection hole; 48. steam guide channel; 49. guide channel; 5. support plate; 51. depression; 52. elastic sheet; 53. support rod; 54. air guide hole; 55. exhaust device; 6. first mounting plate; 7. second mounting plate; 8. first guide roller; 9. second guide roller; 10. heat treatment cover plate; 11. heat insulation chamber. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0047] The nonwoven fabric to be subjected to steam heat treatment in the present invention is specifically a raw material used in medical and sanitary products such as nurse uniforms and masks, and local steam heat treatment is performed at specific locations to strengthen the fiber structure.

[0048] like Figure 1 As shown, the present invention provides a steam heat treatment device for non-woven fabrics, comprising: a workbench 1, a reel 2 and a reel 3 arranged on the upper part of the workbench 1, and a heat treatment mechanism arranged between the reel 2 and the reel 3; the reel 2 and the reel 3 are respectively arranged at two ends of the workbench 1, and the two ends of the non-woven fabric are respectively wound around the reel 2 and the reel 3; the heights of the reel 2 and the reel 3 can be flush, or one high and the other low, and the reel 3 is connected to a reduction motor to drive the reel 3 to rotate at a constant speed to reel the non-woven fabric.

[0049] The heat treatment mechanism includes: a steam generator, a plurality of heat treatment rollers 4 arranged on the upper part of the workbench 1; a support plate 5 is arranged on the upper part of the workbench 1, and a gap for the nonwoven fabric to pass through is left between the support plate 5 and the heat treatment rollers 4. The steam generator is arranged outside the workbench 1, and preferably an electric steam generator is used.

[0050] In this embodiment, the upper surface of the workbench 1 is provided with a first mounting plate 6 and a second mounting plate 7, the support plate 5 is arranged in the middle of the first mounting plate 6 and the second mounting plate 7, and the support plate 5 is arranged horizontally, and the first guide roller 8 and the second guide roller 9 are respectively arranged at both ends of the support plate 5, and the upper end or the lower end of the first guide roller 8 and the second guide roller 9 is flush with the upper surface of the support plate 5.

[0051] Furthermore, there are two second guide rollers 9, and a gap is left between the two second guide rollers 9 for the non-woven fabric to pass through, and the gap is flush with the upper surface of the support plate 5. The non-woven fabric that has been heat-treated with steam is flattened by extrusion between the two second guide rollers 9, thereby reducing the deformation of the non-woven fabric caused by the extrusion of the hemispherical slide bar 44.

[0052] A heat treatment cover plate 10 is provided at the upper end of the second mounting plate 7, one end of the heat treatment cover plate 10 is fixedly connected to the inner side of the first mounting plate 6, both ends of the heat treatment roller 4 are rotatably connected to the heat treatment cover plate 10, and the support plate 5 is arranged on the inner side of the heat treatment cover plate 10 to reduce the leakage of steam into the working environment.

[0053] like Figure 2 and Figure 3As shown, the heat treatment roller 4 includes: a roller body 41, a steam storage chamber 42 opened inside the roller body 41, a plurality of grooves 43 opened on the outer surface of the roller body 41, and a hemispherical slide rod 44 arranged in the groove 43; the steam storage chamber 42 is connected to the steam generator through a pipeline, and the steam storage chamber 42 is opened in the center of the heat treatment roller 4. One end of the shaft connecting the heat treatment roller 4 and the heat treatment cover plate 10 is hollow in design and connected to the pipeline through a sealed bearing, so that the steam generator can transport steam to the steam storage chamber 42 while the heat treatment roller 4 can also rotate, and the pipeline will not rotate with the heat treatment roller 4.

[0054] It is worth noting that the position and size of the groove 43 on the heat treatment roller 4 are set according to the requirements, and are designed according to the size and distribution of the area where a piece of non-woven fabric needs to be steam-heat treated. Furthermore, it is also possible to design each of the multiple heat treatment rollers 4 separately, and the multiple heat treatment rollers 4 cooperate to perform steam heat treatment to complete the work on all the parts of the non-woven fabric that need steam heat treatment, which is more convenient to use and suitable for different non-woven fabric products.

[0055] The groove 43 in this embodiment is cylindrical, and the axis of the groove 43 is set toward the axis of the heat treatment roller 4; the inner end of the hemispherical slide 44 is a cylinder, and the outer end is a hemispherical body with the same diameter as the inner end, and the outer surface of the inner end of the hemispherical slide 44 is slidingly connected to the inner wall of the groove 43, that is, the hemispherical slide 44 is coaxially arranged with the groove 43, and the hemispherical slide 44 moves in the groove 43 along the axial direction of the groove 43.

[0056] The interior of the groove 43 is provided with a telescopic member 45 connected to the outer surface of the hemispherical slide bar 44, and a limit ring 46 is provided at the outlet edge of the groove 43, and the outer surface of the hemispherical slide bar 44 abuts against the limit ring 46. The telescopic member 45 in this embodiment can be a spring or an air bag, etc. One end of the telescopic member 45 is fixedly connected to the inner bottom wall of the groove 43, and the other end is fixedly connected to the inner end of the hemispherical slide bar 44. The hemispherical slide bar 44 cooperates with the groove 43, and under the elastic force of the elastic member, the hemispherical slide bar 44 can only move along the axial direction of the groove 43.

[0057] Furthermore, the outer surface of the limit ring 46 and the outer surface of the heat treatment roller 4 are on the same circumferential surface to keep the surface smooth. At the same time, the inner wall of the limit ring 46 can be set to an arc shape that matches the hemisphere at the outer end of the hemispherical slide 44. When the elastic member remains in the extended state, the outer surface of the hemispherical slide 44 is abutted against the inner wall of the limit ring 46 to ensure the maximum extended position of the hemispherical slide 44.

[0058] In this embodiment, a plurality of steam injection holes 47 are formed on the inner wall of the groove 43, and a steam guide 48 is provided between the steam injection hole 47 and the steam storage chamber 42; when the outer surface of the hemispherical slide rod 44 abuts against the limit ring 46, the outer surface of the hemispherical slide rod 44 is blocked at the opening of the steam injection hole 47, specifically, the inner end cylindrical surface of the hemispherical slide rod 44 is blocked at the opening of the steam injection hole 47 to prevent steam leakage.

[0059] It is worth noting that the diameter of the steam duct 48 is larger than the diameter of the steam injection hole 47, which is intended to increase the instantaneous pressure of the steam during injection, have a higher steam heat treatment effect, and have higher penetration into the non-woven fabric.

[0060] The present invention provides a heat treatment roller 4, the surface of which is provided with a plurality of grooves 43, the grooves 43 are provided with a hemispherical slide bar 44 and a telescopic member 45 connected to the surface of the hemispherical slide bar 44, the outlet edge of the groove 43 is provided with a limiting ring 46, the outer surface of the hemispherical slide bar 44 abuts against the limiting ring 46; the inner wall of the groove 43 is provided with a plurality of steam injection holes 47, when the outer surface of the hemispherical slide bar 44 abuts against the limiting ring 46, the hemispherical slide bar 44 is blocked at the orifice position of the steam injection hole 47, when the hemispherical slide bar 44 on the heat treatment roller 4 does not contact the non-woven fabric, steam will not be ejected, and when the hemispherical slide bar 44 is vertically oriented toward the non-woven fabric and is squeezed, steam injection will be triggered. The present invention not only reduces the waste of energy, but also can realize precise steam heat treatment of parts of the non-woven fabric by controlling the transmission speed of the non-woven fabric and the rotation speed of the heat treatment roller 4, and even by designing the position of the groove 43.

[0061] like Figure 4 As shown, the outer surface of the hemispherical slide bar 44 is provided with a plurality of guide paths 49. When the hemispherical slide bar 44 contacts the non-woven fabric and is squeezed and received in the groove 43, the guide paths 49 and the axis of the steam injection hole 47 are in the same straight line, and the ends of the plurality of guide paths 49 away from the steam injection hole 47 are all facing the non-woven fabric. The plurality of steam injection holes 47 are symmetrically arranged, and the steam injection holes 47 correspond to the guide paths 49 one by one, and the ends of the plurality of guide paths 49 facing the non-woven fabric overlap and are located at the bottom center of the hemispherical slide bar 44; the angle between the straight line where the axis of the steam injection hole 47 and the guide path 49 are located and the axis of the groove 43 is 30 to 40 degrees.

[0062] It is worth noting that the number of guide channels 49 on a hemispherical slide rod 44 is preferably two. The inlet of the guide channel 49 is opened on the inner cylindrical surface of the hemispherical slide rod 44, and the outlet is at the bottom center of the hemispherical slide rod 44. The inlet and outlet are in a straight line, which reduces the collision between the steam and the inner wall of the guide channel 49 and reduces the impact on the steam flow rate.

[0063] The present invention is provided with a heat treatment roller 4, and a plurality of guide channels 49 are provided on the outer surface of a hemispherical slide bar 44. When the hemispherical slide bar 44 contacts the non-woven fabric and is squeezed and received in the groove 43, the guide channels 49 are in the same straight line as the axis of the steam injection hole 47. The ends of the plurality of guide channels 49 away from the steam injection hole 47 are all oriented toward the non-woven fabric and overlap, and are located at the bottom center of the hemispherical slide bar 44. The steam ejected from a plurality of steam injection holes 47 of the present invention is gathered at an outlet through the guide channels 49 and ejected onto the surface of the non-woven fabric. The above-mentioned structural design can effectively enhance the concentration effect of the steam, and form a higher pressure and temperature at the steam outlet of the guide channels 49, thereby improving the steam heat treatment effect on the non-woven fabric.

[0064] like Figure 5 , Figure 6 and Figure 7 As shown, the upper surface of the support plate 5 is provided with a plurality of depressions 51 inclined downward, and the downward end of the depression 51 is close to the unwinding roller 2, the depression 51 is rectangular, semicircular or semi-elliptical, and the plane is facing upward, and an elastic sheet 52 is arranged above the depression 51, and the height of the elastic sheet 52 gradually increases along the conveying direction of the non-woven fabric, that is, the depression 51 has only one opening toward the winding roller 3 on the upper surface of the support plate 5.

[0065] Furthermore, a support rod 53 is provided in the depression, and the upper surface of the support rod 53 is 0.2-0.5 cm away from the upper surface of the support plate 5. When the elastic sheet 52 is deformed into the depression 51, the support rod 53 supports the elastic sheet 52 to prevent the non-woven fabric from sinking into the depression 51.

[0066] Furthermore, the maximum width position dimension of the depression 51 is 1.2-2.5cm, the maximum width position dimension of the elastic sheet 52 is 2-3cm, the thickness of the elastic sheet 52 is 0.2-0.5cm, and the inclination angle of the depression 51 is 30-45°. The non-woven fabric keeps in contact with the upper surface of the support plate 5 during transportation, ensuring the flatness of the non-woven fabric during transportation, and the non-woven fabric is transported in one direction with the upper opening of the depression 51, and contacts with the upper surface of the elastic sheet 52, rather than vertically contacting the depression 51, reducing the friction between the non-woven fabric and the depression 51 during transportation, thereby reducing material wear and fiber damage. Furthermore, even if the hemispherical slide bar 44 squeezes the non-woven fabric in the vertical direction and then squeezes on the elastic sheet 52, the elastic sheet 52 is deformed downward and separated between the non-woven fabric and the depression 51, and the non-woven fabric will not fall into the depression 51.

[0067] An air guide hole 54 is provided at the bottom of the depression 51, and an exhaust device 55 connected to the plurality of air guide holes 54 is provided below the support plate 5, and the exhaust wind speed of the exhaust device 55 is 0.5 to 1 m / s; an air collecting pipe covering all the air guide holes 54 is provided at the output end of the exhaust device 55, and the air collecting pipe is fixedly connected to the lower surface of the support plate 5 to fully and non-leakingly extract excess steam. In the present invention, the exhaust direction from the depression 51 is against the conveying direction of the non-woven fabric, which helps to maintain the flatness of the non-woven fabric during the conveying process, because the exhaust will not directly generate suction on the surface of the non-woven fabric, reducing the risk of wrinkles or deformation of the non-woven fabric due to wind force. Compared with the vertical exhaust in the prior art, the vertical exhaust will generate direct suction on the surface of the non-woven fabric, which will cause the surface of the non-woven fabric to be uneven or sucked into the exhaust holes.

[0068] In summary, the present invention forms a concealed air guide structure on the support plate 5 to guide the ejected steam and discharge excess steam to avoid accumulation on the support plate 5, which would cause the overall humidity of the non-woven fabric to be too high, while not affecting the transportation of the non-woven fabric.

[0069] In this embodiment, a driving mechanism connected to the heat treatment roller 4 is arranged on the workbench 1, and the driving mechanism includes: a servo motor arranged on the workbench 1, a first sprocket arranged at the output end of the servo motor, a second sprocket arranged on the side wall of the heat treatment cover plate 10, and a driving gear arranged on the axis where the heat treatment roller 4 is located, and the driving gear is coaxially arranged with the heat treatment roller 4; the first sprocket is connected to the second sprocket through a chain, a half gear is arranged on one side of the second sprocket, the tooth portion of the half gear is meshed with the driving gear, and the half gear and the second sprocket are coaxially arranged.

[0070] In this embodiment, a third sprocket is provided on one side of the second sprocket, and the third sprockets on adjacent heat treatment rollers 4 are connected by chain transmission. Further, if more heat treatment rollers 4 are to be provided, a worm gear / worm structure can be used to achieve linkage of multiple heat treatment rollers 4, specifically, a connecting long rod is fixedly connected to the output end of the servo motor, and a plurality of worms are provided on the outer surface of the connecting long rod, or multiple worms can be connected by a connecting rod to form a coaxial multi-worm structure, a worm wheel is provided on one side of the half gear, and the worm and the worm wheel are meshingly connected, and the servo motor drives multiple worms to rotate synchronously, drives the worm wheel to rotate, drives the half gear to rotate, and then achieves synchronous intermittent rotation of multiple heat treatment rollers 4 through the meshing of the half gear and the driving gear.

[0071] Furthermore, a braking device is provided at one end of the heat treatment roller 4, preferably an electromagnetic brake is used. When the half gear is not engaged with the driving gear, the braking device is automatically started to apply braking force to the heat treatment roller 4 to prevent it from rotating. This is the prior art and will not be elaborated here.

[0072] The present invention is provided with a driving mechanism connected to the heat treatment roller 4, and adopts an intermittent transmission mechanism of a servo motor, a sprocket and a half gear, so that the heat treatment roller 4 can rotate intermittently. Each time it rotates, the hemispherical slide bar 44 is vertically oriented toward the non-woven fabric and squeezed, thereby triggering steam injection. The present invention realizes size and position control of local heat treatment on the surface of the non-woven fabric by controlling the speed of the servo motor and designing the half gear structure.

[0073] The heat treatment roller 4 in this embodiment further includes: an insulating chamber 11 arranged around the steam storage chamber 42 and the groove 43, the insulating chamber 11 being arranged between the steam storage chamber 42 and the groove 43 and the roller body 41, and filled with ceramic fiber or aerogel. The design of the insulating chamber 11 isolates the steam heat in the steam storage chamber 42 and the groove 43, keeps the surface of the heat treatment roller 4 at a normal temperature, and prevents the heat treatment roller 4 from performing rolling heat treatment on the rest of the non-woven fabric.

[0074] like Figure 7 As shown, a steam heat treatment process for nonwoven fabrics comprises the following steps:

[0075] S1. Wrap one end of the non-woven fabric to be treated around the unwinding roller 2, and the other end passes through the gap between the support plate 5 and the heat treatment roller 4, and is wound around the winding roller 3. The tension of the non-woven fabric is controlled at 30-50N to ensure the stability of the non-woven fabric during transportation and avoid deformation or wrinkles caused by excessive or insufficient tension.

[0076] S2. Start the steam generator to generate enough steam, and transport it to the steam storage chamber 42 of each heat treatment roller 4 through the pipeline. At the same time, monitor the temperature and pressure of the steam in the steam storage chamber 42, and adaptively control the steam temperature to 170-180°C and the pressure to 0.7-0.9MPa to ensure the uniformity of steam heat treatment of the non-woven fabric.

[0077] S3, start the servo motor, drive the second sprocket to rotate through the first sprocket and the chain, drive the heat treatment roller 4 to rotate intermittently through the intermittent transmission of the half gear and the driving gear, and each time the heat treatment roller 4 rotates, a row of hemispherical slide bars 44 corresponding to the heat treatment roller 4 are vertically directed toward the non-woven fabric and squeezed into the groove 43, and steam is ejected through a plurality of steam injection holes 47 and directly injected onto the non-woven fabric through the guide channel 49 to perform steam heat treatment on the local area, and at the same time, the winding roller 3 rotates at a uniform speed, driving the non-woven fabric to move forward;

[0078] S4. Start the exhaust device 53 under the support plate 5. The steam that passes through the non-woven fabric is extracted through the depression 51 and the air guide hole 52 on the support plate 5. The exhaust device 53 can quickly reduce the temperature and humidity of the working area. In addition to guiding the steam, it can also help to quickly reduce the temperature of the non-woven fabric.

[0079] In step S3, two front and rear heat treatment rollers 4 are used, and the distribution of the grooves 43 on the two heat treatment rollers 4 is different, so as to perform steam heat treatment on different areas of the non-woven fabric respectively.

[0080] The present invention provides a steam heat treatment process for non-woven fabrics, which can achieve continuous local steam heat treatment of non-woven fabrics. The intermittent rotation of the heat treatment roller 4 and the vertical orientation design of the hemispherical slide bar 44 enable the steam to effectively act on the non-woven fabric each time it rotates, thereby enhancing the intensity and depth of the local heat treatment. While performing the heat treatment, the steam that has passed through the non-woven fabric is promptly extracted through the exhaust device 53 under the support plate 5. By using two front and rear heat treatment rollers 4, and the different distributions of the grooves 43 on the two rollers, different areas of the non-woven fabric can be steam-heat treated respectively, thereby making up for the problem that two local areas that are very close to each other cannot be steam-heat treated on the same heat treatment roller 4 due to insufficient space on the heat treatment roller 4. Furthermore, the same position can be steam-heat treated on both sides to deepen the effect.

[0081] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A steam heat treatment device for nonwoven fabrics, comprising: A workbench, an unwinding roller and a winding roller arranged on the upper part of the workbench, and a heat treatment mechanism arranged between the unwinding roller and the winding roller, characterized in that: the unwinding roller and the winding roller are respectively arranged at two ends of the workbench, and two ends of the non-woven fabric are respectively wound on the unwinding roller and the winding roller; The heat treatment mechanism comprises: a steam generator, and a plurality of heat treatment rollers arranged on the upper part of the workbench; the heat treatment roller comprises: a roller body, a steam storage chamber provided inside the roller body, a plurality of grooves provided on the outer surface of the roller body, and a hemispherical slide bar provided in the groove; the steam storage chamber is connected to the steam generator through a pipeline; a support plate is arranged on the upper part of the workbench, and a gap is left between the support plate and the heat treatment roller for non-woven fabric to pass through; The interior of the groove is provided with a telescopic member connected to the outer surface of the hemispherical slide rod, a limiting ring is provided at the outlet edge of the groove, and the outer surface of the hemispherical slide rod abuts against the limiting ring; a plurality of steam injection holes are provided on the inner wall of the groove, and a steam guide channel is provided between the steam injection holes and the steam storage chamber; when the outer surface of the hemispherical slide rod abuts against the limiting ring, the outer surface of the hemispherical slide rod blocks the orifice position of the steam injection hole; The outer surface of the hemispherical slide bar is provided with a plurality of guide paths. When the hemispherical slide bar contacts the non-woven fabric and is squeezed and received in the groove, the guide paths are in the same straight line as the axis of the steam injection hole, and the ends of the plurality of guide paths away from the steam injection hole are all facing the non-woven fabric.

2. The steam heat treatment equipment for nonwoven fabrics according to claim 1, characterized in that: The groove is cylindrical, the inner end of the hemispherical slide rod is a cylinder, the outer end is a hemispherical body with the same diameter as the inner end, and the outer surface of the inner end of the hemispherical slide rod is slidably connected with the inner wall of the groove.

3. The steam heat treatment equipment for nonwoven fabrics according to claim 1, characterized in that: The upper surface of the workbench is provided with a first mounting plate and a second mounting plate, the support plate is provided in the middle of the first mounting plate and the second mounting plate, and the support plate is horizontally arranged, and the first guide roller and the second guide roller are respectively provided at both ends of the support plate; a heat treatment cover plate is provided at the upper end of the second mounting plate, one end of the heat treatment cover plate is fixedly connected to the inner side of the first mounting plate, and the heat treatment roller is arranged on the inner side of the heat treatment cover plate.

4. The steam heat treatment equipment for nonwoven fabrics according to claim 1, characterized in that: The plurality of steam injection holes are symmetrically arranged, the steam injection holes correspond one to one with the guide paths, and the plurality of guide paths overlap toward one end of the non-woven fabric and are located at the bottom center of the hemispherical slide rod; the angle between the straight line where the axis of the steam injection hole and the guide path is located and the axis of the groove is 30 to 40°.

5. The steam heat treatment equipment for nonwoven fabrics according to claim 1, characterized in that: The upper surface of the support plate is provided with a plurality of depressions inclined downward, and the downward end of the depression is close to the unwinding roller, the depression is rectangular, semicircular or semi-elliptical, and the plane faces upward; an elastic sheet is arranged above the depression, the height of the elastic sheet gradually increases along the conveying direction of the non-woven fabric, and the upper opening of the depression faces the winding roller; air guide holes are arranged at the bottom of the depression, and an exhaust device connected to the plurality of air guide holes is arranged below the support plate.

6. The steam heat treatment equipment for nonwoven fabrics according to claim 3, characterized in that: The workbench is provided with a driving mechanism connected to the heat treatment roller, and the driving mechanism includes: a servo motor provided on the workbench, a first sprocket provided at the output end of the servo motor, a second sprocket provided on the side wall of the heat treatment cover plate, and a driving gear provided on the shaft where the heat treatment roller is located; The first sprocket is transmission-connected with the second sprocket via a chain. A half gear is disposed on one side of the second sprocket. The toothed portion of the half gear is meshingly connected with the driving gear.

7. The steam heat treatment equipment for nonwoven fabrics according to claim 6, characterized in that: A third sprocket is arranged on one side of the second sprocket, and the third sprockets on adjacent heat treatment rollers are connected via chain transmission.

8. The steam heat treatment equipment for nonwoven fabrics according to claim 1, characterized in that: The heat treatment roller further comprises: a heat insulation cavity arranged around the steam storage cavity and the groove, the heat insulation cavity is arranged between the steam storage cavity and the groove and the roller body, and the heat insulation cavity is filled with ceramic fibers or aerogel.

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