Hot air penetration type drying system for wet spunlace

Abstract

The utility model discloses a hot air penetration type drying system for wet spunlace, which comprises a wall frame, a thermal cycle air supplement adjusting device and a circulating fan, and an upper-layer flow guide air plate, a rotary drum drying net and a lower-layer flow guide air plate are arranged in the wall frame; the upper-layer flow guide air plate is located above the rotary drum drying net, the lower-layer flow guide air plate is located below the rotary drum drying net, and the thermal cycle air supplement adjusting devices are arranged at an inlet and an outlet of the drying oven respectively. Due to the unique penetrating type design, hot air can directly act on the surfaces of materials, the drying time is greatly shortened, and meanwhile energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of textile equipment, more particularly, relate to a kind of hot air penetration type drying system for wet water jet. BACKGROUND

[0002] In the production process of spunlace nonwoven fabric, although the web is pressed by calender to remove water after being made into cloth by water jet, there is still a large amount of water adsorbed on the cloth, therefore, it is necessary to set a drying process in the production process of spunlace nonwoven fabric. In the traditional process, hot air drying method is often used, that is, the surface of the conveying belt is dried by hot air. This drying method often causes poor drying effect of nonwoven fabric, which cannot guarantee the product quality of nonwoven fabric.

[0003] The existing patent document CN109140975A (a new hot air circulation drying equipment for non-woven fabric production, January 4, 2019) records a drying heating box. The non-woven fabric is distributed in the form of "S" on both sides of the heating box through the upper and lower guide rollers, so that the upper and lower surfaces of the non-woven fabric can be heated multiple times inside the drying box, which is beneficial to quickly remove the moisture of the non-woven fabric and improve the drying efficiency. At the same time, the hot air can be recycled, which reduces the energy consumption caused by the use of hot air. Since the non-woven fabric is distributed in the form of "S", in order to improve the drying efficiency, a plurality of ceramic heating pipes need to be arranged in the heating box and spaced apart between the non-woven fabrics. The hot air generated by the ceramic heating pipes is used to dry the non-woven fabric. In actual industrial production process, due to the specific arrangement of the ceramic heating pipes and the non-woven fabric, the heating box often needs to have a larger volume, which is not conducive to the optimal configuration of industrial land and production line. At the same time, this method has low utilization rate of thermal efficiency, and the product has a hard hand feeling.

[0004] The current hot air penetration type dryer, such as "National Defense Textile Guide", No. 2005, No. 9, "Application of dryer in spunlace nonwoven fabric production", Liu Dongsheng, Donglun Science and Technology Industrial Co., Ltd. (China), records a penetration type drying method. During the process of spunlace cloth passing through the drying cylinder cover along the rotating drum, the honeycomb structure is adopted on the surface of the rotating drum. The vacuum suction system in the rotating drum makes the steam hot air penetrate through the spunlace cloth into the drum and be sucked away. The water on the cloth evaporates and is taken away with the hot air sucked into the drum. The extracted air is sent to the circulation system, and after the water is removed, it is heated by the heat exchanger and then sent to the drying cover. It has been proved in practice that the drying efficiency of steam hot air penetration type is obviously higher than that of other hot air drying methods, and the product has a good hand feeling. However, in actual production process, it is still necessary to continuously provide steam hot air, which consumes a large amount of energy. UTILITY MODEL CONTENTS

[0005] The utility model aims to solve the problems in the prior art and provides a hot air penetration type drying system for wet water jet.

[0006] Technical scheme: a hot air penetration type drying system for wet water jet, comprising a wall frame, a heat cycle air supplementing adjusting device and a circulating fan, the wall frame is provided with an upper layer flow guide air plate, a rotating drum drying net and a lower layer flow guide air plate;

[0007] The upper layer flow guide air plate is located above the rotating drum drying net, the lower layer flow guide air plate is located below the rotating drum drying net, and the heat cycle air supplementing adjusting device is arranged at the inlet and outlet of the drying oven respectively.

[0008] In some embodiments, the wall frame comprises a frame, an outer panel, an inner panel and an intermediate thermal insulation layer, the intermediate thermal insulation layer adopts a glass fiber / rock wool composite needled felt structure.

[0009] In some embodiments, the frame is an I-shaped steel structure, the frame, the outer panel and the inner panel are all made of stainless steel material, and the thickness of the outer panel and the inner panel is 0.8-1.2 mm.

[0010] In some embodiments, the fineness of the glass fiber in the intermediate thermal insulation layer is 10-25 μm, the length is 51-76 mm, and the content is 60%-80%; the fineness of the rock wool fiber is 7-15 μm, the length is 51-76 mm, and the content is 20%-40%; the two kinds of fibers are opened and mixed, and then air-laid and needled, the single-layer area density of the composite felt is 1000-1500 g / m 2 , and the thickness is 30-40 mm.

[0011] In some embodiments, the upper layer flow guide air plate and the lower layer flow guide air plate are both made of stainless steel material, the thickness is 1.5-2.0 mm, the surfaces are both hydrophobic and corrosion-resistant, and the upper and lower layers are aligned and perforated, the pore diameter is 15-20 mm, and the pore spacing is 2.5-3 times the pore diameter.

[0012] In some embodiments, the flow guide air plate between the two adjacent rows of holes in the transverse direction of the upper layer flow guide air plate is in a streamline shape and is installed at an inclination of 10°-15°, and the low end is directly connected to the flow guide groove.

[0013] In some embodiments, the rotating drum drying net is in a cylindrical structure, is located in the middle of the drying oven, is a nickel-chromium alloy net with high thermal conductivity, and the number of mesh holes of the net is 17-20.

[0014] In some embodiments, a rotating drum hot air baffle is further included, the rotating drum hot air baffle is fixed in the upper part of the rotating drum drying net, is in a semicircular structure, is made of stainless steel material, and the thickness is 2.0-3.0 mm.

[0015] In some embodiments, the circulating fan comprises a hot air exhaust circulating fan, a burner and a drying oven air supply circulating fan.

[0016] The beneficial effects of the drying system are as follows:

[0017] (1) The drying system of the utility model, adopt the structure design of penetration, make hot air can directly act on the material surface, greatly shorten the drying time, reduce the energy consumption at the same time;

[0018] (2) The drying system of the utility model, optimize the hot air circulation system, ensure the uniform distribution of the temperature in the drying oven, dry evenly, improve the product quality, the heat efficiency of new system will improve 20%, the production efficiency improves 30%, the product qualified rate improves 5%, at the same time, the energy consumption of drying oven will reduce 20%, the production cost reduces accordingly;

[0019] (3) The drying system of the utility model, the middle flow guide baffle of the two rows of holes of horizontal adjacent in the upper layer perforated flow guide plate is in streamline type and is installed with inclination 10 ° ~ 15 °, and the low end is directly connected with the flow guide groove, so as to guarantee the smooth airflow and timely discharge of condensate water;

[0020] (4) The drying system of the utility model, the wall frame is composed of frame, inner and outer panels and intermediate thermal insulation layer, the frame and the inner and outer panels are all stainless steel metal materials, the frame is I-shaped steel structure, the panel thickness is 0.8 ~ 1.2 mm, the outer surface is smooth, and the inner surface is hydrophobic and corrosion-resistant; the intermediate thermal insulation layer is glass fiber / rock wool composite needled felt, wherein the glass fiber fineness is 10 ~ 25 μm, the length is 51 ~ 76 mm, the content is 60% ~ 80%, the rock wool fiber fineness is 7 ~ 15 μm, the length is 51 ~ 76 mm, and the content is 20% ~ 40%, two kinds of fibers are opened and mixed, and then air-laid and needled, the composite felt single-layer area density is 1000 ~ 1500 g / m 2 , the thickness is 30 ~ 40 mm, and during assembly, 3 ~ 4 layers of composite are used according to the heat insulation requirement, and after compounding, the thickness is controlled to be 90 ~ 130 mm, so as to maintain a reasonable air static layer. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the drying oven structure schematic view of an embodiment of the utility model;

[0022] Figure 2 It is the drying oven wall structure sectional view of an embodiment of the utility model;

[0023] Figure 3 It is the upper layer flow guide baffle structure schematic view of an embodiment of the utility model;

[0024] Figure 4 It is the lower layer flow guide baffle structure schematic view of an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The present application will be further described in detail below through specific embodiments and in connection with the drawings.

[0029] Embodiment 1

[0030] As shown in Figure 1 , a hot air penetration type drying system for wet water jet, comprising a wall frame 1, a heat cycle air supplement adjusting device 4 and a circulating fan, the wall frame 1 is provided with an upper layer flow guide air plate 2, a rotating drum drying net 5 and a lower layer flow guide air plate 6.

[0031] The upper layer flow guide air plate 2 is located above the rotating drum drying net 5, the lower layer flow guide air plate 6 is located below the rotating drum drying net 5, and the heat cycle air supplement adjusting device 4 is arranged at the inlet and outlet of the drying oven respectively.

[0032] In this embodiment, in order to improve the heat preservation effect, as shown in Figure 2 , the wall frame 1 comprises a frame, an outer panel 11, an inner panel 13 and a middle heat preservation layer 12, and the middle heat preservation layer 12 adopts a glass fiber / rock wool composite needled felt structure.

[0033] Further, the frame is an I-beam structure, the frame, the outer panel 11 and the inner panel 13 are made of stainless steel material, the outer surface is a smooth surface, and the inner surface is a hydrophobic and corrosion-resistant surface, the thickness of the outer panel 11 and the inner panel 13 is 0.8-1.2 mm.

[0034] Further, the fineness of the glass fiber in the intermediate thermal insulation layer 12 is 10-25 μm, the length is 51-76 mm, and the content is 60%-80%, the fineness of the rock wool fiber is 7-15 μm, the length is 51-76 mm, and the content is 20%-40%, the two kinds of fibers are opened and mixed and then air-laid and needled, and the single-layer area density of the composite felt is 1000-1500 g / m 2 , and the thickness is 30-40 mm. During assembly, 3-4 layers of the composite are used according to the heat insulation requirement, and the thickness of the intermediate thermal insulation layer after the composite is controlled to be 90-130 mm to maintain a reasonable air static layer.

[0035] In the embodiment, the upper layer flow guide air plate 2 and the lower layer flow guide air plate 6 are made of stainless steel material, the thickness is 1.5-2.0 mm, the surface is a hydrophobic and corrosion-resistant surface, and the upper and lower layer air plates are aligned and perforated, the hole diameter is 15-20 mm, and the hole spacing is 2.5-3 times the hole diameter.

[0036] Further, in order to timely drain the water accumulated on the upper layer flow guide air plate, as shown in Figure 3 , the upper layer flow guide air plate 2 includes a first plate body 21, a plurality of first through holes 22 are distributed on the first plate body 21, the flow guide air plate is in a streamline raised structure 23 between the transversely adjacent two rows of first through holes 22 of the first plate body 21, and the first plate body 21 is installed at an inclination of 10°-15°, and the low end is directly connected to the flow guide groove to ensure smooth airflow and timely drainage of condensed water. The upper layer flow guide air plate 2 is close to the system air outlet, the air moisture content is high, and condensed water will be generated, the conventional perforated flow guide air plate is used for dehydration, the drying efficiency is low, and therefore the inclined structure needs to be used.

[0037] In the embodiment, as shown in Figure 4 , the lower layer flow guide air plate 6 is close to the system air inlet, the air moisture content is very low, and condensed water will not be generated, and the conventional perforated flow guide air plate can be used, the second plate body 61 is made of stainless steel material, the thickness is 1.5-2.0 mm, and the surface is a hydrophobic and corrosion-resistant surface. The second through holes 62 are uniformly and vertically distributed on the plate, the hole diameter is 15-20 mm, and the hole spacing is 2.5-3 times the hole diameter.

[0038] In the embodiment, as shown in Figure 1As shown, the rotary drum drying mesh 5 is a direct-acting component of the hot air penetration drying system used in wet hydroentangling. It is cylindrical, located in the center of the oven, and is made of a high thermal conductivity nickel-chromium alloy mesh with 17-20 mesh openings. The material to be dried is arranged in a wavy pattern, tightly adhering to the surface of the rotary drum drying mesh 5 and passing around it sequentially. The heated hot air enters from the periphery of the rotary drum drying mesh 5, first passing through the material to be dried, and then through the rotary drum drying mesh 5 into the interior.

[0039] In this embodiment, as Figure 1 As shown, the system also includes a rotary drum hot air baffle 3, which is fixed to the upper part of the rotary drum drying mesh 5. It has a semi-circular structure, is made of stainless steel, and has a thickness of 2.0~3.0mm. The main function of the rotary drum hot air baffle 3 is to deliver the hot air, heated by the hot air furnace, into the drying zone according to a predetermined direction, working temperature, and airflow, thereby completing the drying of the material.

[0040] In this embodiment, as Figure 1 As shown, the hot air circulation adjustment device 4 is installed at the inlet and outlet of the oven. The hot air circulation adjustment device 4 adopts a mature PLC control system to improve the automation level and ease of operation of the oven.

[0041] In this embodiment, the circulating fan includes a hot air exhaust circulating fan 7 and a burner and oven supply air circulating fan 8. The hot air exhaust circulating fan 7, driven by an electric motor, rotates its blades to generate a negative pressure effect, drawing in the hot, humid air passing through the rotating drum drying screen 5 and discharging it through the exhaust port into the steam-water separator. The separated and filtered recovered hot air is then reintroduced into the air supply system to save energy. Figure 1 As shown, the hot air exhaust circulation fan 7 includes two fans, one of which is installed inside the rotary drum drying screen 5 and the other is installed outside the drying oven.

[0042] The burner and oven air circulation fan 8 are components of the air supply system. The oven burner uses natural gas for direct combustion heating. The air added consists of two parts: fresh air supplied from the outside and heated recovered hot air. The heated hot air is sent into the drying zone by the oven air circulation fan through the lower guide vane 6.

[0043] Example 2

[0044] The above-mentioned method for a hot air penetration drying system for wet hydroentangling includes:

[0045] Combination Figure 1The wet spunlace nonwoven material which needs to be dried is fed into the hot air through type drying system at a design speed of 5-200 m / min after negative pressure dewatering in the previous process, and is fed into the oven drum drying net 5 by the guide roller group. The wrap angle of the wet spunlace nonwoven material to the oven drum drying net 5 is 110°-150°. From the drying efficiency, the larger the wrap angle, the higher the efficiency, but at the same time, the wet strength of the wet spunlace nonwoven material should be considered. For the material with high wet strength, the wrap angle to the oven drum drying net 5 can even be increased to 180°, but for the material with low wet strength, such as flushable wet wipe coiled material, the wrap angle to the oven drum drying net 5 should be small, otherwise the material will be broken and the continuous operation cannot be realized.

[0046] The hot air exhaust circulating fan 7 and the burner and oven air supply circulating fan 8 of the circulating fan work in coordination to form a gradient pressure distribution area in which the internal pressure of the drum drying net 5 is less than the external pressure, so that the wet spunlace nonwoven material is adsorbed on the surface of the drum drying net 5. After being heated by the burner and oven air supply circulating fan 8, the air supply passes through the lower layer of the perforated guide air plate 6, the wet spunlace nonwoven material and the lower half of the drum drying net 5 in turn, and most of the air supply enters the inside of the drum drying net 5. At this time, the water in the material is partially taken away, the temperature of the hot air is reduced from 110°-130° to 80°-100°, and the humidity is increased from 10%-20% to more than 65%. This kind of humid hot air is no longer suitable for drying the material, and needs to be discharged from the drying system by the help of the hot air exhaust circulating fan 7, and then is recombined into the air supply system after external steam-water separation and filtration. The dry hot air continues to circulate in the system. Another part of the humid hot air which does not enter the hot air exhaust circulating fan 7 rises to the upper layer of the perforated guide air plate 2, and the water in the humid hot air condenses on the streamlined raised part of the upper layer of the perforated guide air plate 2 and is discharged to the low end under the action of the installed inclined angle. The relatively humid hot air with a humidity of 30%-40% is discharged from the drying system by the hot air exhaust circulating fan 7 at the top end of the mechanism, and then is recombined into the air supply system after external steam-water separation and filtration, so as to save energy. The oven drum air baffle 3 is installed in the upper half of the inside of the oven drum net, and its function is to close the hot air flow and form effective circulation of the hot air. The sealing part of the baffle is a non-working surface, and the wrap angle of the baffle to the drum drying net 5 should match the wrap angle of the wet spunlace nonwoven material to the drum drying net 5.

[0047] In addition to the above-mentioned functions of passing through the air flow, condensing and guiding out the water, the upper layer of the perforated guide air plate 2 and the lower layer of the perforated guide air plate 6 also have the function of air flow rectification, so that the hot air penetrates the wet spunlace nonwoven material vertically, uniformly and orderly, and the water in the material evaporates rapidly. The burner and oven air supply circulating fan 8 and the hot air exhaust circulating fan 7 work in coordination to ensure that part of the hot air is taken away and discharged outside the machine, and part of the hot air is circulated, so that the drying system can operate orderly and continuously, and the drying effect can be continuously achieved.

[0048] The drying part of the production line is composed of several drying units as described above, when the wet spunlace nonwoven material passes through the working surface of a drum drying net 5, the material is sequentially introduced into the next drying unit and the contact surface of the material and the drum drying net 5 is changed at the same time, so that the material is dried on the front and back surfaces alternately for several times until the moisture regain of the material reaches the winding standard, and then the material is sent out by the cloth guide roller and wound up. The structures of the drying units are basically similar, but the drying temperature and the exhaust speed are arranged in a gradient, that is, the temperature of the drying unit first contacting the material is higher and the exhaust speed is faster, the temperature of the subsequent drying units is gradually reduced, and the exhaust speed is also gradually reduced, and the overall gradient design should meet the drying curve, which is beneficial to improve the drying efficiency and save energy.

[0049] The hot air penetration type drying system for wet spunlace has a unique penetration type design, so that the hot air can directly act on the surface of the material, greatly shortens the drying time, and reduces the energy consumption. The internal structure of the drying oven is innovatively designed, the hot air circulation system is optimized, the uniform distribution of the internal temperature of the drying oven is ensured, the drying is uniform, and the product quality is improved. It is expected that the thermal efficiency of the new system will be increased by 20%, the production efficiency will be increased by 30%, and the product qualified rate will be increased by 5%. At the same time, the energy consumption of the drying oven will be reduced by 20%, and the production cost will be reduced accordingly. The servo motor transmission eliminates the shutdown caused by the broken cloth of the drying oven, and improves the production efficiency. By using the intelligent control system of the drying oven, the drying parameters can be set and adjusted according to the characteristics of different materials, precise control is realized, and energy consumption is reduced.

[0050] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has been disclosed as above, however, it is not used to limit the utility model, any skilled person in the art can make some changes or modifications to the equivalent embodiments with the disclosed technical content without departing from the technical scheme of the utility model, as long as the content of the utility model is not deviated, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model are still within the scope of the technical scheme of the utility model.

Claims

1. A hot air penetration drying system for wet hydroentangling, characterized in that: It includes a wall frame (1), a hot air circulation adjustment device (4) and a circulating fan. The wall frame (1) is provided with an upper air guide plate (2), a rotary drum drying screen (5) and a lower air guide plate (6). The upper air guide plate (2) is located above the rotary drum drying screen (5), the lower air guide plate (6) is located below the rotary drum drying screen (5), and the heat circulation air supply adjustment device (4) is respectively installed at the inlet and outlet of the oven.

2. The hot air penetration drying system for wet hydroentangling according to claim 1, characterized in that: The wall frame (1) includes a frame, an outer panel (11), an inner panel (13), and an intermediate insulation layer (12), wherein the intermediate insulation layer (12) adopts a fiberglass / rock wool composite needle-punched felt structure.

3. A hot air penetration drying system for wet hydroentangling according to claim 2, characterized in that: The frame is an I-beam structure. The frame, outer panel (11) and inner panel (13) are all made of stainless steel. The thickness of the outer panel (11) and inner panel (13) is 0.8~1.2mm.

4. A hot air penetration drying system for wet hydroentangling according to claim 2, characterized in that: The intermediate insulation layer (12) contains glass fibers with a fineness of 10~25μm, a length of 51~76mm, and a content of 60%~80%, and rock wool fibers with a fineness of 7~15μm, a length of 51~76mm, and a content of 20%~40%. The two types of fibers are loosely mixed and then air-formed into a mesh through needle punching. The density of the single layer of the composite felt is 1000~1500g / m². 2 The thickness is 30~40mm.

5. A hot air penetration drying system for wet hydroentangling according to claim 1, characterized in that: The upper air guide plate (2) and the lower air guide plate (6) are both made of stainless steel with a thickness of 1.5~2.0mm. The surfaces are all hydrophobic and corrosion resistant. The upper and lower layers are aligned and perforated with a hole diameter of 15~20mm and a hole spacing of 2.5~3 times the hole diameter.

6. A hot air penetration drying system for wet hydroentangling according to claim 5, characterized in that: The upper guide vane (2) has a streamlined bulge between two adjacent rows of holes and is installed at an inclination of 10°~15°, with the lower end directly connected to the guide groove.

7. A hot air penetration drying system for wet hydroentangling according to claim 1, characterized in that: The rotary drum drying mesh (5) has a cylindrical structure and is located in the middle of the drying oven. It is a nickel-chromium alloy mesh with a high thermal conductivity and the number of mesh openings is 17-20.

8. A hot air penetration drying system for wet hydroentangling according to claim 7, characterized in that: It also includes a rotary drum hot air baffle plate (3), which is fixed inside the upper part of the rotary drum drying mesh (5), has a semi-circular structure, is made of stainless steel, and has a thickness of 2.0~3.0mm.

9. A hot air penetration drying system for wet hydroentangling according to claim 1, characterized in that: The circulating fan includes a hot air exhaust circulating fan (7) and a burner and oven air supply circulating fan (8).

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