CN100378262C - Forming method for interweaving composite filter material by using aerodynamic force - Google Patents

Abstract

A method for forming a composite filter material interwoven by using gas power comprises the steps of respectively conveying short fibers and functional particulate matters to a composite gas air injection device by using gas flows, enabling the feeding gas flows of the short fibers and the functional particulate matters to simultaneously enter a diffusion mixing conveying area, enabling the mixed feeding gas flows to diffuse from top to bottom, enabling the gas flows to flow through a flow guide device, enabling the gas flows to be stably conveyed to a multilayer composite forming area below the diffusion mixing conveying area, utilizing an air suction device arranged below the multilayer composite forming area to sequentially adsorb and stack the short fibers and the particulate matters on a moving forming net to form a multilayer filter material with a sparse-dense-layer structure, heating and forming the filter material, and cooling and forming the filter material; therefore, the formed filter material comprises a multi-layer interweaving composite structure body of a protective layer at the bottom, an adsorption layer in the middle and a flow equalizing layer above.

Description

Forming method of interweaving composite filter material by gas power

technical field

The invention relates to a molding method for interweaving composite filter materials using gas power.

Background technique

In the application field of chemical pollution protection filter materials, there are many mature technologies, among which loading functional particulate matter in fiber nets, such as activated carbon, is the mainstream of technology. Existing many invention documents set forth the production technology of this type of filter material, as: US Patent Nos.4,795,668, Krueger et al.4,868,032 are disclosed by Ei an et al. Dynamic functional particulate matter and other related technologies are mainly used in the production process of adsorption filter materials. Fibers are used as adhesives to adhere functional particulate matter to the fiber structure, and then filter air or liquid. The passing toxic pollutants are adsorbed by functional particles to achieve the purpose of protective filtration.

In the prior art, there are those who use the Melt-Blown method to form a net, and then add functional particulate matter, such as activated carbon, during the manufacturing process to make it adhere to the melt-blown cotton net structure. Therefore, the resistance (pressure drop) of the filter material produced by this method is high, and it cannot be effectively applied to the production of filter materials with high particulate content. Moreover, the melt-blown fibers are small, and the uniformity and stability of the cotton web structure are poor, which may easily cause the displacement of functional particulate matter in subsequent processing and application, and even shedding loss.

The US.5,486,410 patent published by Groeger et al. uses the three-dimensional structure formed by the composite fiber as the carrier, and fixes the functional particulate matter in the holes of the fiber net, and then uses subsequent layer-by-layer lamination to achieve The purpose of high particulate matter content is to increase the stability of functional particulate matter in the structure of the filter material, so as not to cause loss and loss in subsequent processing applications, and to produce filter materials with high content of functional particulate matter, such as: active When carbon is used for chemical adsorption protection, the service life is invisible.

However, using the three-dimensional structure of the fiber net as a carrier, and then adhering or fixing functional particulate matter in the structure, although a certain functionality can be achieved, due to the limited shape of the carrier, the structure can only be fixed in a single way. type of presentation. However, the increase in the content of functional particulate matter is helpful to the improvement of the service life, but it does not help much in the actual adsorption or filtration efficiency.

In addition, the previous technology is to mechanically make the fibers into a three-dimensional network structure, and then use the hole space between the fibers to place particulate matter. The size of the pores is also different, and it is not easy to control the density uniformity of the structure. Therefore, many pores are often filled with no functional particulate matter, which leads to the least resistance when the airflow or liquid passes through, thus causing flow. Channeling effect. On the contrary, it causes the phenomenon that the pollution source molecules cannot be captured by the functional particulate matter. Therefore, uneven structural density is also a factor that causes poor efficiency, especially when the layers are stacked, because the fiber structure cannot bear the weight of particulate matter, the structure collapses, and it is a defect in the structural density, resulting in The filter material is of poor quality.

At the same time, it is impossible to control the thickness of fibers and the appearance and shape of particulate matter to achieve an appropriate combination and uniform structure density, which is beyond the reach of various previous technologies. Because the three-dimensional structure of the fiber is used as the carrier to limit the shape of its structure, it is impossible to control its variability during the manufacturing process.

Therefore, for functional filter materials, such as adsorptive filter materials, in addition to adding functional particulate matter to the fibrous structure, the adsorption efficiency and service life must also be taken into account. In addition, it is necessary to be able to control the variability of the structure, such as: the uniformity of the combined structure of the fiber fineness and the appearance and shape of the particulate matter and the creation of non-linear flow channels, increasing the residence time of the pollution source in the filter material and thereby increasing The probability of contact with functional substances, so as to improve the function and efficiency of the filter material, achieve the purpose of effective prevention and control of chemical pollution, and the application field is also wider.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the existing chemical pollution protection filter material and its manufacturing method, the present invention provides a forming method for interweaving composite filter material using gas power. The heat treatment method is supplemented. And use short-cut fiber as the basic raw material and functional particulate matter (such as: activated carbon, potassium permanganate impregnated alumina, chemical adsorption polymer, etc.) , interweaving, composite molding, and the aerodynamic interweaving composite molding technology of the chemical protective filter material in the form of sheet non-fabric.

Another object achieved by the present invention is based on aerodynamics, which can interweave and compound the fibers and particulate matter at the same time, instead of using the fiber forming net as the precursor. The dispersion and bulk density of the material are due to the stable airflow. Therefore, a very uniform effect can be achieved, and the two substances are interlaced and fixed. Therefore, the structure has high stability, and the airflow is used to disperse, mix, transport, and finally pile up and form to control the mixing ratio of the two substances, and even if the particulate matter is made of The change from low content to high content is compositely formed at the same time, without the need for layering and stacking, and the uniformity of the bulk density is still very good without causing any structural defects.

Another object achieved by the present invention is that when forming by airflow dynamics, due to the change of airflow passing resistance, the three-layer structure formed by a single filter material can be changed from sparse to dense, and the mutual ratio of the three-layer structure can be controlled at the same time. To achieve the best airflow resistance and chemical adsorption efficiency. The change selection of fiber fineness and the size of appropriate particulate matter cooperate with each other, and the use of airflow dynamic molding can also control the airflow resistance and stagnation time (Residence Time) at the same time, and relatively increase the efficiency, so the control over the structural change factors is quite high. Quality control is also good.

Another object achieved by the present invention is to interweave and compound the formed filter material by air flow power, which has a uniform stacking structure and uniform resistance to the formed air flow, that is, the probability of passing through the surface of the fiber and the surface of the functional particulate matter is uniform. But for adsorptive filter materials, such as activated carbon filter materials, when the pollution source airflow passes through, if the closer to the surface of the adsorbent (activated carbon) passes through, the probability of chemical pollution molecules being captured and adsorbed is relatively increased. Based on this After the invention is molded, the molded filter material is heat-treated by using special heat treatment technology, which can make the surface of the fiber melt and adhere to the surface of the functional particulate matter, and the surface of the fiber aggregates also adhere to each other, so the structural strength of the filter material after heat treatment The relative improvement of structural stability also improves. On the other hand, the fibers also shrink when they are hot-melted. Invisibly, the pores at the interface of the fiber aggregates become denser and smaller due to shrinkage, and the interface between the fiber aggregates and the particulate matter is unable to move due to the steric barrier between the particulate matter, resulting in pores. Expand to form a specific flow channel for polluted airflow, and the flow channel formed by the three-dimensional structure of the filter material is a non-linear and irregular route. In this way, not only the chemical pollution molecules are mainly composed of functional particles When the material passes through the surface, the contact probability increases, and the residence time in the filter material structure increases, thus increasing the capture and adsorption time, and greatly improving the overall efficiency.

The present invention utilizes the technical scheme adopted in the forming method of gas dynamic interweaving composite filter material to be:

A forming method utilizing aerodynamic interweaving composite filter material, characterized in that the steps are as follows:

(a) Separately use the airflow to send short fibers and functional particulate matter to a composite gas blowing device, and the feed air flow of the particulate matter is set in the middle of the composite gas blowing device, and the feed air flow of the two enters at the same time Diffusion and mixing conveying area, so that the mixed feeding airflow drives the short fiber and particulate matter to diffuse from top to bottom, and flows through a diversion device, so that the airflow can be stably conveyed to the multi-layer composite molding area below;

(b) Use the suction device located under the multi-layer composite molding area to adsorb and accumulate short fibers and particulate matter on a moving forming net in sequence, and adjust the suction volume of the suction device according to demand to make it mixed with the The feeding air flow reaches a balance, and can form a multi-layer filter material with a gradual structure of sparse and dense on the moving forming screen;

(c) sending the above-mentioned formed filter material into the heat treatment and shaping area, heating with a heat source, and controlling the heating temperature between 120°C and 180°C;

(d) Send the aforementioned heated and shaped filter material into the cooling zone.

The above-mentioned molding method using gas dynamic interweaving composite filter material, wherein the functional particulate matter is activated carbon, potassium permanganate impregnated alumina or chemically adsorbed macromolecule matter.

The above-mentioned molding method using gas power interweaving composite filter material, wherein the diffusion mixing transmission area is a mixing box with the opening facing down, and the flow guide device inside is composed of several pieces of adjustable flow guide plates.

In the forming method of the aforesaid gas-powered interwoven composite filter material, the heat treatment shaping area is continuously inhaled by an air suction device under the filter material.

In the forming method of the aforesaid gas-powered interwoven composite filter material, the cooling zone is under the filter material and a suction device continuously sucks air downward during cooling.

It can be seen from this that, using the technology of the present invention, the controllability of the functional filter microstructure (microstructure) is quite good, and the variability can conform to a wider range of application fields, and the quality, performance, and efficiency are better than general products. , and this technology has reached the stage of mass production, and the technology of the present invention can contribute to the prevention and control of increasingly serious environmental chemical pollution.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a flow block diagram of the implementation steps of the present invention.

Figure 2 is a schematic diagram of the process of the present invention.

Fig. 3 is a schematic diagram of interweaving composite molding of the filter material of the present invention.

Fig. 4 is a schematic structural view of the adsorption layer of the filter material of the present invention before heat treatment.

Fig. 5 is a schematic structural view of the adsorption layer of the filter material of the present invention after heat treatment.

FIG. 6 is an enlarged schematic view of the structure shown in FIG. 4 .

FIG. 7 is an enlarged schematic view of the structure shown in FIG. 5 .

Detailed ways

As shown in Fig. 1 and Fig. 2, the steps that the present invention implements include:

(a) Short fibers 1 and functional particulate matter 2 are sent to a composite gas blowing device 3 by air flow respectively, and the feeding air flow of the particulate matter 2 is arranged in the middle of the composite gas blowing device 3, where the blowing The function of device 3 is like a blowing device, but its shape is not limited to a circle. Its preferred embodiment is a rectangular body, so that the air blowing port becomes a narrow and long state, so that the feeding airflow of the two can enter the diffusion mixing transmission at the same time In zone 4, the mixed feed airflow 41 drives short fibers and particulate matter to diffuse from top to bottom, and flows through a flow guiding device 42, so that the airflow is stably transmitted to the multi-layer composite molding zone 5 below;

(b) Utilize the suction device 51 located under the multi-layer composite molding area 5 to adsorb and accumulate the short fibers 1 and particulate matter 2 on a moving forming net 52 in sequence, and adjust the suction of the suction device 51 as required Air volume, so that it reaches a balance with the mixed feed air flow 41, and can form three layers of filter materials 8 with a gradual structure of sparse and dense on the moving forming screen 52;

(c) Send the filter material 8 of the aforementioned molding into the heat treatment and shaping area 6, heat it from above with a heat source 61, and control the heating temperature between 120°C and 180°C; The device 62 continues to inhale;

(d) When the above-mentioned heated and shaped filter material 8 is sent into the cooling zone 7, an air suction device 71 can be used to continuously suck air downward during cooling.

In addition, the aforementioned functional particulate matter 2 can be activated carbon, potassium permanganate impregnated alumina, or chemically adsorbed polymers.

Furthermore, the above-mentioned diffusion mixing transfer area 4 is a box-shaped container 43 with the opening facing downwards, and the flow guide device 42 provided therein is composed of several pieces of flow guide plates.

By means of the above-mentioned technical means, the feed air flow 11 of the short fiber 1 passes through the composite gas blowing device 3, where it merges with the feed air flow 21 of the functional particulate matter 2, and the functional particulate matter 2 can utilize a certain amount of feeding system , after quantitative feeding, use the feed air flow 21 to enter the compound gas blowing device 3, and then make the mixed feed air flow 41 of the two substances enter the diffusion mixing transmission area 4 at the same time. As the air flow leaves the blowing device while the fluid area increases, turbulence is caused here, and then the short fibers 1 and the functional particulate matter 2 are diffused and mixed with each other, and then a special flow guiding device 42 is used in the lower half of the area , so that the airflow 41 is stably delivered to the multi-layer composite molding area 5 .

And in the diffusion mixing transmission area 4, due to the factor of the composite gas blowing device 3, three clearly distinguished air flow areas can be formed, as shown in Figure 3, the left and right sides A1 and A3 are mainly fiber areas, while the middle A2 is It is the area covered by the mixture of fibers and activated carbon. This phenomenon will cause obvious sub-structures during the subsequent molding. The outlet of the composite gas blowing device 3 is designed to be adjustable, so it can simultaneously control the three area areas A1, The mutual ratio between A2 and A3 changes the cross-sectional structure of the filter material. In the future, the air spray device can be adjusted according to the needs to meet the required filter material structure.

After the mixed air flow passes through the guide device 42, the forming process is carried out. At this stage, the short fiber 1 and the particulate matter 2 are mainly deposited on a moving forming net 52 by using the suction device 51, and the forming net 52 is formed by using the conveying device. 53 to make it move forward, and the air suction device 51 can adjust the air intake and the feed air flow 41 to achieve a balance, that is, there will be no difference in air flow velocity on both sides of the molding surface. If the air intake is insufficient, the feed air flow 41 will be reversed. The short fiber 1 and the functional particulate matter 2 will be blown away and cannot be formed. If the air intake is too large, it will affect the transmission speed in the diffusion mixing transmission area 4, and it is easy to cause the two materials to be mixed and interwoven evenly and quickly, and damage the The structural uniformity of the filter material, therefore, the adjustment of the suction device 51 is absolutely necessary during molding. During molding, due to the three airflow areas A1, A2, and A3 formed during diffusion and mixing, when molding on the forming net 52 at the same time, three stages of molding can be formed. As shown in Figure 3, stage I is formed by the assembly of bottom fibers Accumulation, because the forming net 52 is in continuous motion, it then enters stage II, where short fibers 1 and particulate matter 2 are interwoven and accumulated, and finally the fiber aggregates of stage III are deposited on it, initially forming a functional three-layer structure filter material.

During molding, the three stages are carried out at the same time. The feeding airflow 41 mixes the short fibers and particulate matter 2 to the forming net 52, and then uses the suction device 51 to remove the feeding airflow 41. The entire process airflow is at In a steady state operation, the air flow is steady through the formed structure. The main key of gas dynamic forming is to control at this stage. The cross-sectional structure of the preliminary filter material 8 after forming is shown in Figure 3. The filter material 8 presents an obvious three-layer three-dimensional structure, which includes:

A protective layer 81 is located at the bottom layer of the formed filter material, mainly composed of short fibers 1, and presents a relatively densely packed state;

An adsorption layer 82 is located above the protective layer, mainly composed of functional particulate matter 2, and is evenly interwoven with short fibers to form a three-dimensional structure, wherein the packing density of the functional particulate matter is relatively sparse. The pore density of the final short fiber aggregate is relatively dense, so that the interface between the short fiber and the surface of the functional particulate matter forms a non-linear airflow channel 84;

A uniform flow layer 83 is located above the aforementioned adsorption layer 82, mainly composed of short fibers 1, and presents a relatively loosely packed state.

This layered structure is mentioned in the above description, because the short fiber 1 and the particulate matter 2 form three shunt areas A1, A2, A3 in the diffusion mixing transmission zone 4. When the short fiber 1 and the particulate matter 2 are mixed When the feed air flow 41 is piled up and formed at the same time, the fiber zone I on the left will be piled up and formed on the forming net 52 first, and then short fibers and particulate matter 2 in the middle zone II of the forming net 52 will interweave and accumulate on it. The formed fiber web aggregate can prevent the particulate matter 2 from being taken away by the air flow and fall off at this time, so the interwoven and mixed aggregate of short fibers 1 and particulate matter 2 can be uniformly accumulated and formed, and finally transported to the right forming area III, where the fibers are accumulated and formed again On the upper part of the filter material, the airflow forming stage is completed here.

At this stage, the present invention mainly utilizes aerodynamic molding, which not only achieves the purpose of simultaneously accumulating and interweaving the short fibers 1 and particulate matter 2, but also causes the filter material 8 to have a three-layer three-dimensional structure, and the packing density of the three-layer structure is also high. Produces a gradual effect from sparse to dense, as shown in Figure 3, in the forming stage I, the feed airflow 41 only has dispersed very short fibers 1 in the diversion area A1, and is first accumulated and formed on the forming net 52 , the stacking thickness is thin, so the flow velocity of the airflow in this area is relatively high, which can make the short fibers have a high packing density, a compact structure, and the holes between the short fibers are relatively small. In addition, the three-dimensional structure of the short fiber aggregate is also due to the stability of the airflow. And evenly, a protective layer 81 structure is formed at the bottom of the filter material. When the short fibers and particulate matter interweave and accumulate on the protective layer 81, due to the gradual increase in the accumulation thickness, the air flow velocity in this structure is relatively reduced, and the short fibers 1 and the particulate matter 2 are evenly intertwined and accumulated with each other at the same time, due to the interaction between the two substances The three-dimensional shape of the appearance is different, so the composite structure density is sparser than the pure fiber aggregate structure density of the protective layer 81, and the main adsorption function area in the middle of the filter material 8 is formed, that is, the adsorption layer 82. The aerodynamic forming will make short fibers and particulate matter interweave and accumulate at the same time, and flow and fill each other, so that the structure density is uniform, and the dispersion density of the two is also uniform, and there will be no structural defects and holes. At this time, the apparent thickness of the overall filter material gradually increases, so the resistance to the airflow also increases relatively. Finally, the short fiber feed airflow 41 on the right side of the forming area III short fiber feeds the short fiber in the diverging area A3 and deposits the short fiber on the adsorption metal 82. , due to the large resistance of the air flow velocity in this forming area, the velocity of the flow velocity through the structure is also the lowest, resulting in sparse and uniform fiber packing density, forming the equal flow layer 83 of the filter material, and the holes between the fibers of this structure are relatively large , but with high uniformity.

For the aforementioned functional particulate matter using "activated carbon" as the filter material, when the filter material structure has a layered structure from sparse to dense, its adsorption efficiency will be superior to that of a single filter material structure. When a pollution source airflow passes through the filter material, its airflow direction is as shown in Figure 4, enters from the equalizing layer 83, and when the protective layer 81 flows out, the three-dimensional structure of the equalizing layer 81 is relatively sparse, and when the airflow passes through the fiber 1 assembly, it will Evenly dispersed, therefore increasing the area of the pollution source passing through the activated carbon adsorption layer 82, so that the pollution source airflow all diffuses into the activated carbon fiber interweaving layer. When the thickness of the filter material increases, the airflow velocity also decreases due to diffusion and resistance, making the pollution Molecular residence time increases, and is adsorbed by activated carbon 2 simultaneously, and the packing structure of its short fiber 1 assembly of protective layer 81 of filter material 8 is denser, and the resistance that airflow produces is the largest, so can relatively control polluted airflow in adsorption layer 82 residence time. However, in the design of the composite gas blowing device 3 of the present invention, the area ratios of the airflow diversion areas A1, A2, and A3 can be adjusted, and relatively, the ratio of the stacking thickness of the layered filter material structure during molding can be controlled, and the pollution source can be filtered and adsorbed according to the actual situation. The required conditions are appropriately adjusted to meet the needs of customers with the best use efficiency, that is, when the accumulation thickness of the protective layer 81 is higher, the airflow resistance of the overall filter material 8 is high, and the residence time of pollutant molecules is also lengthened. Efficiency increases and vice versa.

In addition, the flow equalization layer 83 and the protective layer 81 of the filter material structure sandwich the adsorption layer 82, which can prevent the movement or falling off of the activated carbon particles 2, and the short fibers and the activated carbon 2 in the adsorption layer 82 form an interwoven three-dimensional structure at the same time. , It can also prevent the displacement and detachment of activated carbon particles, so the overall filter material 8 has high structural stability and good uniformity after molding. In the filter material structure, the mixing ratio of short fibers and activated carbon can also be quantitatively controlled in the manufacturing process. In the present invention, the content of activated carbon can be controlled in the range of 10% to 90%, and the content of short fibers can also be controlled. Controlled within this range, its structure and the dispersion of the two substances can maintain a certain degree of uniformity, but the relatively high or low content of the structure is not much in the general actual application of adsorption and filtration. Therefore, the optimal content of activated carbon after the test Between 60% and 90%, the overall performance of the filter material 8 is the best, and the relative fiber content is between 15% and 40%. While the overall basis weight of the filter material changes, this process can be used to form from a low weight of 100g/m ² to a high weight of 1,200g/m ² at the same time, without the need to use layers and layers to achieve high volume or high content. Therefore, the technology of aerodynamic compound molding can control the content ratio of the components and the change of the basis weight of the filter material at the same time. All conditions can be adjusted and controlled at the same time during the manufacturing process. One-time molding does not need to be completed through subsequent processing. Therefore, The development value of this process technology is high.

In addition, as the basis weight of the filter material changes, different fiber diameters (that is, the denier number) can be selected, and the particle size of the activated carbon can be compounded to form the above-mentioned uniform structure, and the stability is high, unlike other processes Add activated carbon to the three-dimensional structure of the formed fiber net. When the weight of the filter material is light or thin, if the fiber diameter is large, the holes formed will be large. If the activated carbon is to be fixed in the holes between the fibers, the particles will also It must be large, so the unit amount of activated carbon is high. To achieve lightweight basis weight, the number of activated carbon particles must be relatively reduced in an equal filter material area, resulting in sparse and uneven distribution of activated carbon, and greatly reduced adsorption efficiency. If the fiber diameter is reduced, the number of fibers per unit area must be increased to form a three-dimensional network structure. In this way, the holes between the fibers become smaller, so that the activated carbon particles cannot enter the holes between the fibers uniformly and completely, making the structure The stability is poor and the loss of activated carbon is also high, so the adsorption function of the filter material is poor. However, as described in the present invention, the process of mixing the short fiber 1 and the activated carbon 2 at the same time by gas power, and then interweaving the one-time forming process does not have the above-mentioned disadvantages. How to change, as long as the two are properly matched, an adsorption filter material with high uniformity and high structural stability can be obtained.

When the filter material is formed, the main adsorption performance is completed in the interweaving part of the short fiber and activated carbon, that is, the adsorption layer 82. The two substances are dispersed in the airflow, and they are piled up after mixing. The transmission fluidity in the medium is also different, and the bulk density is also different. The activated carbon particles 2 are three-dimensionally irregular. During the airflow forming and stacking process, the particles are hindered by three-dimensional obstacles, so that the pore space between the activated carbon particles 2 is quite large. As shown in Figure 6, the activated carbon particles produced Pores and voids, and when the air flow passes through, the voids and voids become the main flow path of the air flow, because they are hindered by activated carbon particles. At the same time, the ultra-short fibers 1 carried in the forming air flow have high dispersion fluidity with the air flow, and fill and flow into the pores of the activated carbon 2, and are blocked by the activated carbon particles, and accumulate to form a network structure of fiber aggregates 1 , so that the overall airflow resistance is average, the flow rate of the airflow is uniform, and the structure of the adsorption layer of the formed filter material is relatively stable, and the short fibers 1 and activated carbon 2 are evenly dispersed and interwoven into a three-dimensional structure with uniform packing density, as shown in Figure 4. This structure is mainly achieved by aerodynamic shaping factors.

However, after the short fiber 1 and the activated carbon 2 are mixed and formed, when the air flow passes through, due to the three-dimensional obstacle caused by the activated carbon 2, the air flow partly flows through the surface of the activated carbon, and most of it passes through the fiber aggregate 1, so The bulk density between the short fiber aggregates 1 is formed by gas power, so the density is uniform, the airflow resistance is uniform and lower than the airflow resistance caused by activated carbon particles 2, so when the filter material structure is adsorbed and filtered, the pollutant molecules will Most of them pass through the short fibers 1, and when the fiber aggregates are in a penetrating series connection, it is easy for the pollutant molecules to directly penetrate the filter material 8, so that the activated carbon 2 cannot exert its substantial effect.

From the above, the formation of non-linear airflow channels and the structure of increasing contact with the surface of activated carbon will become the main key points of the functionality of activated carbon adsorption filter materials, and for this relationship, there is no mention in the prior art of how to achieve this The relevant process technology of the structure, in the aerodynamic composite molding technology of the present invention, the gas is used as the power first, and the short fiber 1 and the activated carbon 2 are evenly dispersed and interwoven into a three-dimensional structure. Absolutely high uniformity, and then the formed filter material 8 is subjected to special heat treatment, as shown in FIG. 2 . When the formed filter material 8 is sent to the heat treatment and shaping area 6 by using the forming net 52, a layer of positioning forming net 54 is added above the filter material 8, and the heat treatment temperature is controlled between 120°C and 180°C, depending on the production Depending on the speed and basis weight of the filter material. The heat treatment method does not use simple radiation irradiation or hot air circulation heating, but uses far-infrared rays as the heat source 61 above the filter material 8 to heat, and at the same time uses an air suction device 62 to inhale air below the filter material 8. This purpose is to dissipate the hot air. It runs through the filter material 8 to make it evenly heated, and when inhaling, because the air is sucked from the bottom of the filter material 8, the filter material 8 will produce resistance to the air flow due to its own three-dimensional thickness, and the closer to the suction side, the greater the suction force, and vice versa. Therefore, when the filter material 8 is heated, its structure maintains an obvious structure from sparse to dense, so this structure has an absolute effect on the adsorption function mentioned above. When the heat-treated filter material leaves the heat treatment chamber, it immediately enters the cooling zone and continues to inhale downwards with a suction device 71 during cooling, mainly to ensure that the structure is stable during the process from forming to heat treatment to cooling and coiling. Consistency, that is, a three-dimensional structure consisting of sparse and dense.

In addition, when the short fiber 1 is heat-treated, when reaching its softening point temperature, the surface of the fiber starts to melt and the fiber begins to shrink. The short fibers stick to each other and shrink at the same time. Therefore, after heat treatment, the structural strength and stability of the filter material 8 are greatly improved due to the adhesion effect of the fibers, while the fibers still retain their softness, so the filter material can be easily bent. On the other hand, for activated carbon 2, heat treatment will not melt or shrink the surface, but heat is the main energy for desorption and regeneration of activated carbon, so activated carbon can be desorbed The effect of humidity and reactivation maintains the best adsorption performance of activated carbon, and with this adhesion method, it is not necessary to use any adhesive to strengthen the structure, and the surface of activated carbon 2 will not be covered with adhesive, and the effective adsorption surface area is large. , relatively high adsorption performance of the filter material.

When heat treatment, the heat shrinks the fiber, so the fiber aggregate 1 filled with short pores between the activated carbon 2 particles shrinks, as shown in Figure 5 and Figure 7, causing the interfacial pores between the fibers to shrink, and the fiber aggregate 1 as a whole shrinks. The structural density tends to be denser, and the resistance to airflow becomes larger relatively, while the interfacial pores between the short fiber 1 and the surface of the particle 2 become larger, because when the fiber shrinks, the activated carbon particles 2 do not shrink, and because the three-dimensional obstacle factor does not Large-scale displacement will occur due to fiber shrinkage, and the pore size will still be maintained, so the pores between the short fiber 1 and the surface of the activated carbon 2 will increase, and the structure here will tend to be loose. This phenomenon can be shown by the enlarged schematic diagram of the filter material in Figure 7. Therefore, when the chemically polluted air flow passes through the activated carbon adsorption filter material, it is caused by the resistance of the activated carbon 2 and the shrunk fiber aggregate 1, and the pores between the fibers and the surface of the activated carbon are mainly used as the flow channel 84 to pass through the filter material. Increase the probability of contact between pollutant molecules in the airflow and the surface of activated carbon, and the adsorption efficiency will be greatly improved, which is better than other activated carbon filter materials. And because the structure of the filter material is a three-dimensional three-dimensional structure, the resulting flow channel 84 is a non-linear tortuous flow channel, which increases the residence time of the airflow through the filter material, increases the time for the activated carbon to absorb pollutant molecules, and also Improve the overall function of the filter material.

In summary, the present invention forms a three-layer structure filter material technology with aerodynamic interwoven fibers and functional particulate activated carbon, which not only can produce an adsorption functional filter material with a uniform structure and high stability, but also uses special heat treatment, Control the key structure of the filter material, improve the adsorption efficiency, and the composite and variability of the product are better than other adsorptive filter materials.

Claims (5)

1. A molding method utilizing aerodynamic interweaving composite filter material, is characterized in that, its steps are as follows: (a) Separately use the airflow to send short fibers and functional particulate matter to a composite gas blowing device, and the feed air flow of the particulate matter is set in the middle of the composite gas blowing device, and the feed air flow of the two enters at the same time Diffusion and mixing conveying area, so that the mixed feeding airflow drives the short fiber and particulate matter to diffuse from top to bottom, and flows through a diversion device, so that the airflow can be stably conveyed to the multi-layer composite molding area below; (b) Use the suction device located under the multi-layer composite molding area to adsorb and accumulate short fibers and particulate matter on a moving forming net in sequence, and adjust the suction volume of the suction device according to demand to make it mixed with the The feeding air flow reaches a balance, and can form a multi-layer filter material with a gradual structure of sparse and dense on the moving forming screen; (c) sending the above-mentioned formed filter material into the heat treatment and shaping area, heating with a heat source, and controlling the heating temperature between 120°C and 180°C; (d) Send the aforementioned heated and shaped filter material into the cooling zone. 2. The molding method utilizing aerodynamic interwoven composite filter material according to claim 1, characterized in that the functional particulate matter is activated carbon, potassium permanganate impregnated alumina or chemically adsorbed polymer substances. 3. The forming method utilizing aerodynamic interweaving composite filter material according to claim 1, characterized in that the diffusion mixing transfer area is a mixing box with the opening facing down, and the flow guiding device set in it is made of several pieces Adjustable deflector composition. 4. The forming method utilizing aerodynamic interweaving composite filter material according to claim 1, characterized in that said heat treatment shaping zone is continuously inhaled by an air suction device below the filter material. 5. The molding method utilizing aerodynamic interweaving composite filter material according to claim 1, characterized in that the cooling zone continues to inhale downwards with an air suction device when cooling below the filter material.

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