Intermittent hot melt adhesive line without baffle filter and intermittent mode selection method

Abstract

The application provides an intermittent hot melt glue line non-baffle filter, which comprises an outer frame and a filter core arranged in the outer frame, the filter core comprises filter material and hot melt glue for fixing the pleat shape of the filter material, a plurality of hot melt glue lines are arranged on the surface of the filter material, and the hot melt glue line is a linear glue formed by hot melt glue on the surface of the filter material. By adopting the intermittent glue line, the internal stress concentration caused by thermal expansion and cold shrinkage of the long glue line is broken, the bending deformation of the filter paper is reduced, the flatness of the filter core is improved, the physical obstruction of the glue line to the airflow channel is reduced, the resistance is reduced, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, and in particular to an intermittent hot melt adhesive line filter without separators and a method for selecting the intermittent mode. Background Technology

[0002] Separator air filters are widely used in cleanrooms, ventilation systems, and various air purification equipment due to their small size, flexible installation, and large filtration area. Their core structure consists of pleated, wavy filter paper. To ensure the filter paper does not deform under rated airflow and to provide a smooth airflow path, hot melt adhesive lines, commonly known as "adhesive lines," are usually placed between the pleats and troughs of the filter paper. Currently, mainstream separatorless filters use continuous hot melt adhesive lines, applying adhesive along the entire length of the filter paper pleats. While this provides stable support, the continuous adhesive lines obstruct the effective filtration area of ​​the filter paper, reducing the ventilation area and increasing airflow resistance. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a non-partitioned filter for intermittent hot melt adhesive lines and a method for selecting intermittent modes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an intermittent hot melt adhesive line filter without separators, comprising an outer frame and a filter element disposed within the outer frame, wherein the filter element comprises filter media and hot melt adhesive for fixing the pleats of the filter media, and a plurality of hot melt adhesive lines are provided on the surface of the filter media, wherein the hot melt adhesive lines are linear adhesives formed by hot melt adhesive being applied to the surface of the filter media.

[0005] Preferably, the filter media includes a plurality of pleats, with two adjacent pleats connected end to end to form the filter media; the pleats include a left pleat surface and a right pleat surface, and the left pleat surface and the right pleat surface are connected at the pleat peak / pleat valley.

[0006] Preferably, the hot melt adhesive lines extend perpendicular to the height direction of the filter material, and the hot melt adhesive lines are distributed in a matrix, with vertically adjacent hot melt adhesive lines parallel to each other and horizontal hot melt adhesive lines at the same height.

[0007] Preferably, the hot melt adhesive line is the support section of the filter element, and the space between adjacent hot melt adhesive lines at the same height is the air permeable section of the filter element. The lengths of the support sections on the air inlet / outlet surfaces of the filter material are all equal, and the lengths of the air permeable sections on the air inlet / outlet surfaces of the filter material are all equal.

[0008] Preferably, each pleat of the filter material is provided with a support section and an air-permeable section, and the support section and air-permeable section of each pleat are centrally symmetrically distributed after unfolding.

[0009] Preferably, the hot melt adhesive line extends from the fold peak / valley of each fold of the filter material to the left and right fold surfaces, and the hot melt adhesive line extending from the fold peak does not overlap with the hot melt adhesive line extending from the fold valley. The hot melt adhesive line is located outside the fold peak and fold valley, inside the fold peak and fold valley, or simultaneously inside and outside the fold peak and fold valley.

[0010] Preferably, the hot melt adhesive line is located in the middle section of the left and right pleated surfaces, and is located on the left and right sides of the left and right pleated surfaces.

[0011] Preferably, the outer frame is provided with protective mesh on both the front and rear sides, and the pleats and troughs of the filter material face the protective mesh.

[0012] To achieve the above objectives, the present invention adopts the following technical solution: a method for selecting the intermittent mode of an intermittent hot melt adhesive line filter, comprising the following steps: S1: Select the positions of the support section and the ventilation section according to the air volume; When operating in harsh conditions where the air volume is greater than the rated air volume, the hot melt adhesive line extends from the fold peak / valley of each fold of the filter material to the left and right fold surfaces, and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the outside of the fold peak and fold valley. When the operating air volume is close to or lower than the rated air volume, and there are requirements to control costs but to keep the resistance characteristics constant, the hot melt adhesive line extends from the fold peak / fold valley of each fold of the filter material to the left and right fold surfaces, and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the inside of the fold peak and fold valley. In conventional operating conditions where there is a need to optimize both cost and resistance, the hot melt adhesive line extends from the fold peak / valley of each fold of the filter material to the left and right fold surfaces, while forming an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the inner and outer sides of the fold peak and valley. When the operating air volume is close to or lower than the rated air volume, and the airflow channel is required to be relatively unobstructed and the resistance is lower, the hot melt adhesive line is located in the middle section of the left and right pleated surfaces, and is located on both sides of the left and right pleated surfaces, forming an intermittent adhesive line pattern of upper ventilated section + middle support section + lower ventilated section. S2: Calculate the lengths of the support section and the ventilation section; L t +L s =2H; L s =L s,1 +L s,2 +...+L s,i ; L t =L t,1 +L t,2 +...+L t,i ; Among them, L s L is the total effective support length of the inner and outer single-sided hot melt adhesive lines on a single fold. s,i The length of a single hot melt adhesive segment on a single-pleated filter element, 0 < L s,i <2H,L t L is the total length of the breathable area without hot melt adhesive lines on both the inner and outer sides of a single pleat. t,i The length of a single air-permeable section on a single-pleated filter element, 0 < L t,i <2H, where H is the depth of a single fold after the filter paper is folded, and the range of H is 100-300mm; Measure H, set L s Calculate L t L t,i L s,i ; Furthermore, L s,1 =L s,2 =...=L s,i L t,1 =L t,2 =...=L t,i Both the support section and the breathable section are evenly distributed; Furthermore, L s ≥L s0 L t ≤L t0 ; Among them, L s0 To ensure the filter element does not deform when operating at rated airflow, the minimum support section length is 0.8H ≤ L. s0 ≤1.6H, L t0 To ensure that the airflow can normally pass through the filter element without local collapse when the filter is operating at its rated airflow, the maximum permeable section length is 0.4H ≤ L. t0 ≤1.2H; S3: Calculate the percentage of hot melt adhesive line length; η=L s / (L) s +L t ); Where η is the proportion of adhesive thread length, reflecting the amount of adhesive thread used and the support density; The calculated η should be within the range of 30% to 60% to ensure sufficient support while preventing excessive resistance. S4: Calculate the glue thread consumption saving rate; θ=[(2H-L s ) / 2H]*100%; Where θ is the glue line usage saving rate; S5: Set the spacing between two adjacent rubber strips on the same airflow side; L mThe spacing between two adjacent rubber strips on the same airflow side, 1 inch ≤ L m ≤2 inch; If the hot melt adhesive lines on the filter media are arranged at equal intervals, then L m If the hot melt adhesive lines on the filter media are not evenly spaced, then L m They are not equal; S6: Set the hot melt adhesive line according to the data obtained in steps S1-S5.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses intermittent adhesive lines, which form an adhesive-free air-permeable section in the middle area of ​​the filter element, making the airflow channel smoother and significantly reducing resistance; the air-permeable section allows the airflow to flow laterally between adjacent filter paper pleats, making the airflow between the filter element pleats unobstructed; the air-permeable section allows the airflow to be spontaneously redistributed between the pleats, bypassing local high-resistance areas and avoiding eddies caused by local excessive airflow; the air-permeable section makes the leeward side connected to the surrounding airflow, the return flow area is blown away, and it is difficult to maintain a stable vortex, making it less likely to form local eddies, reducing the sudden contraction and expansion of the flow, making the flow field closer to the laminar or low-turbulence state, and reducing the energy consumption of the filter operation; the intermittent adhesive lines reduce the amount of adhesive used, and at the same time reduce the adhesive spraying time, equipment wear and tear, and energy consumption; the use of intermittent adhesive lines breaks the internal stress concentration caused by thermal expansion and contraction of long adhesive lines, reduces the bending deformation of filter paper, and improves the flatness of the filter element; the intermittent adhesive lines are positioned at two points, providing more stable support, and the filter element is less likely to deform when operating at high air volume. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the high-pleat, high-separator-free intermittent hot melt adhesive line filter of the present invention.

[0015] Figure 2 This is a schematic diagram of the filter media cross-section of the intermittent hot melt adhesive line filter without separators of the present invention.

[0016] Figure 3 This is a diagram showing the location of the filter media and hot melt adhesive line in the intermittent hot melt adhesive line filter of the present invention.

[0017] Figure 4 Example of a hot melt adhesive line for a septum-less filter according to the present invention. Figure 1 .

[0018] Figure 5 Example of a hot melt adhesive line for a septum-less filter according to the present invention. Figure 2 .

[0019] Figure 6 Example of a hot melt adhesive line for a septum-less filter according to the present invention. Figure 3 .

[0020] Figure 7Example of a hot melt adhesive line for a septum-less filter according to the present invention. Figure 4 .

[0021] Figure 8 This is an example diagram of the hot melt adhesive line of the single-pleated filter paper in the intermittent hot melt adhesive line filter of the present invention.

[0022] Figure 9 This is a flowchart of the intermittent mode selection method for the intermittent hot melt adhesive line filter of the present invention.

[0023] Figure descriptions: 1. Outer frame, 2. Protective mesh, 3. Hot melt adhesive line, 4. Filter element, 41. Filter material, 42. Pleats, 43. Left pleated surface, 44. Right pleated surface, 45. Pleat peak, 46. Pleat valley, 5. Support section, 6. Breathable section. Detailed Implementation

[0024] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0025] Example 1

[0026] Please refer to the reference. Figure 1 The present invention provides a non-segmented filter for intermittent hot melt adhesive lines, including an outer frame 1 and a filter element 4 disposed within the outer frame 1.

[0027] like Figure 4 As shown, the filter element 4 includes filter material 41 and hot melt adhesive for fixing the pleats of the filter material; several hot melt adhesive lines 3 are provided on the surface of the filter material 41, and the hot melt adhesive lines 3 are linear adhesives formed by hot melt adhesive being applied to the surface of the filter material.

[0028] The use of continuous adhesive lines to block the lateral flow of air between the pleats forces the airflow to move only along the longitudinal direction of the pleats, creating local vortices or backflow zones near the adhesive lines. Intermittent adhesive lines create a breathable section without adhesive in the middle area of ​​the filter element, making the airflow channel smoother and significantly reducing resistance. The breathable section allows the airflow to flow laterally between adjacent filter paper pleats, ensuring airflow continuity between the filter element pleats. The breathable section allows the airflow to be spontaneously redistributed between the pleats, bypassing local high-resistance areas and avoiding vortices caused by excessively fast local airflow. The breathable section connects the leeward side with the surrounding airflow, dispersing the backflow zone and making it impossible to maintain stable vortices, thus reducing the formation of local vortices. This reduces sudden contraction and expansion of the flow, making the flow field closer to laminar or low-turbulence states and reducing the energy consumption of the filter operation.

[0029] like Figure 2 As shown, the filter material 41 includes a plurality of pleats 42, and two adjacent pleats are connected end to end to form the filter material 41; the pleats include a left pleat surface 43 and a right pleat surface 44, and the left pleat surface 43 and the right pleat surface 44 are connected at the pleat peak 45 / pleat valley 46.

[0030] like Figure 3 As shown, the extension direction of the hot melt adhesive line 3 is perpendicular to the height direction of the filter material 41. The hot melt adhesive lines 3 are distributed in a matrix. The vertically adjacent hot melt adhesive lines 3 are parallel to each other, and the horizontal hot melt adhesive lines 3 are located at the same height, so that the support section 5 is located at the same height and the air-permeable section 6 is located at the same height. The air-permeable section 6 is horizontally aligned between adjacent pleats, forming a glue-free through corridor. The airflow can flow smoothly along the channel between the pleats, avoiding additional bypass or local blockage caused by the misalignment of the support section 5 and the air-permeable section 6.

[0031] like Figure 4 As shown, the hot melt adhesive line 3 is the support section 5 of the filter element 4, and the air permeable section 6 of the filter element 4 is between adjacent hot melt adhesive lines 3 at the same height. The lengths of the support sections 5 on the air inlet / outlet surfaces of the filter material 41 are all equal, and the lengths of the air permeable sections 6 on the air inlet / outlet surfaces of the filter material 41 are all equal. This avoids the situation where the lengths of the air permeable sections 6 are unequal, resulting in a large local air permeable area and a small local air permeable area, which leads to uneven airflow velocity distribution, high flow velocity and high resistance in narrow areas, and low flow velocity and local eddies in wide areas. Each fold of the filter material 41 is provided with a support section 5 and an air permeable section 6. After unfolding, the support sections 5 and air permeable sections 6 of each fold are centrally symmetrically distributed to ensure that the support force on the left and right sides of each fold is the same. This avoids deformation on the side with the smaller support force due to different support forces on the left and right sides under the same wind force, which would affect the use.

[0032] like Figure 4 As shown, the hot melt adhesive line 3 extends from the pleat peak 5 / pleat valley 6 of each pleat of the filter material 41 to the left pleat surface 43 and the right pleat surface 44, and the hot melt adhesive line 3 extending from the pleat peak 45 does not overlap with the hot melt adhesive line 3 extending from the pleat valley 46. The hot melt adhesive line 3 is located outside the pleat peak 45 and the pleat valley 46, forming an intermittent adhesive line pattern of top support + middle ventilation + bottom support.

[0033] like Figure 1 As shown, the outer frame 1 is provided with protective mesh 2 on both the front and rear sides, and the pleats 5 and pleats 6 of the filter material 41 face the protective mesh 2.

[0034] Please refer to the reference. Figures 8-9 This invention provides a method for selecting the intermittent mode of a septum-less filter for intermittent hot melt adhesive lines, comprising the following steps: S1: Select the positions of support section 5 and ventilation section 6 according to the air volume; When the operating air volume is greater than the rated air volume, the hot melt adhesive line 3 extends from the pleat peak 45 / pleat valley 46 of each pleat of the filter material 41 to the left pleat surface 43 and the right pleat surface 44, and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the outside of the pleat peak 45 and pleat valley 46. When the operating air volume is close to or lower than the rated air volume, and there are requirements to control costs, but the resistance characteristics need to be kept constant, the hot melt adhesive line 3 extends from the pleat peak 45 / pleat valley 46 of each pleat of the filter material 41 to the left pleat surface 43 and the right pleat surface 44, and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support inside the pleat peak 45 and pleat valley 46. In normal operating conditions where there is a need to optimize both cost and resistance, the hot melt adhesive line 3 extends from the pleat peak 45 / pleat valley 46 of each pleat of the filter material 41 to the left pleat surface 43 and the right pleat surface 44, while forming an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the inner and outer sides of the pleat peak 45 and pleat valley 46. When the operating air volume is close to or lower than the rated air volume, and the airflow channel is required to be relatively unobstructed and the resistance is lower, the hot melt adhesive line 3 is located in the middle section of the left pleated surface 43 and the right pleated surface 44, and is located on the left and right sides of the left pleated surface 43 / right pleated surface 44, forming an intermittent adhesive line pattern of upper ventilated section + middle support section + lower ventilated section. S2: Calculate the lengths of support section 5 and ventilation section 6; L t +L s =2H; L s =L s,1 +L s,2 +...+L s,i ; L t =L t,1 +L t,2 +...+L t,i ; Among them, L s L is the total effective support length of the inner and outer single-sided hot melt adhesive lines on a single fold. s,i The length of a single hot melt adhesive segment on a single-pleated filter element, 0 < L s,i <2H,L t L is the total length of the breathable area without hot melt adhesive lines on both the inner and outer sides of a single pleat. t,i The length of a single air-permeable section on a single-pleated filter element, 0 < L t,i <2H, where H is the depth of a single fold after the filter paper is folded, and the range of H is 100-300mm; Measure H, set L s Calculate L t L t,i L s,i ; Furthermore, L s,1 =L s,2 =...=L s,i L t,1 =L t,2 =...=Lt,i Both the support section 5 and the breathable section 6 are evenly distributed; Furthermore, L s ≥L s0 L t ≤L t0 ; Among them, L s0 To ensure that filter element 4 does not deform when the filter is operating at its rated airflow, the minimum support section length is 0.8H ≤ L. s0 ≤1.6H, L t0 To ensure that the airflow can normally pass through the filter element 4 without local collapse when the filter is operating at its rated airflow, the maximum permeable section length is 0.4H≤L. t0 ≤1.2H; S3: Calculate the length percentage of hot melt adhesive line 3; η=L s / (L) s +L t ); Where η is the proportion of adhesive thread length, reflecting the amount of adhesive thread used and the support density; The calculated η should be within the range of 30% to 60% to ensure sufficient support while preventing excessive resistance. S4: Calculate the glue thread consumption saving rate; θ=[(2H-L s ) / 2H]*100%; Where θ is the glue line usage saving rate; S5: Set the spacing between two adjacent rubber strips 3 on the same airflow side; L m The distance between two adjacent rubber strips 3 on the same airflow side is 1 inch ≤ L. m ≤2 inch; If the hot melt adhesive lines 3 on the filter media 41 are arranged at equal intervals, then L m If the hot melt adhesive lines 3 on the filter media 41 are not evenly spaced, then L m They are not equal; S6: Set the hot melt adhesive line 3 according to the data obtained in steps S1-S5.

[0035] Different intermittent modes can be selected according to different working conditions to adapt to different working conditions and ensure the best performance.

[0036] Example 2

[0037] The difference from Example 1 is that, as Figure 5As shown, the hot melt adhesive line 3 extends from the pleat peak 5 / pleat valley 6 of each pleat of the filter material 41 to the left pleat surface 43 and the right pleat surface 44, and the hot melt adhesive line 3 extending from the pleat peak 45 does not overlap with the hot melt adhesive line 3 extending from the pleat valley 46. The hot melt adhesive line 3 is located inside the pleat peak 45 and the pleat valley 46, forming an intermittent adhesive line pattern of top support + middle ventilation + bottom support.

[0038] Example 3

[0039] The difference from Example 1 is that, as Figure 6 As shown, the hot melt adhesive line 3 extends from the pleat peak 5 / pleat valley 6 of each pleat of the filter material 41 to the left pleat surface 43 and the right pleat surface 44. The hot melt adhesive line 3 extending from the pleat peak 45 does not overlap with the hot melt adhesive line 3 extending from the pleat valley 46. The hot melt adhesive line 3 forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on both the inner and outer sides of the pleat peak 45 and the pleat valley 46.

[0040] Example 4

[0041] The difference from Example 1 is that, as Figure 7 As shown, the hot melt adhesive line 3 is located in the middle section of the left pleated surface 43 and the right pleated surface 44, and is located on the left and right sides of the left pleated surface 43 and the right pleated surface 44, forming an intermittent adhesive line pattern of upper breathable section + middle support section + lower breathable section. The number of support sections 5 on the left pleated surface 43 / right pleated surface 44 side is a positive integer greater than or equal to 1.

[0042] Example 5

[0043] Based on the above embodiment 1, the filter configuration is set to F9 efficiency, with glass fiber filter paper, dimensions of 610×610×292mm, pleat height of 230mm, pleat spacing of 3.6mm, and L... m =1 inch, rated air volume is 3400m³ 3 / h.

[0044] Mode 1: The adhesive line covers the peaks and valleys of each fold of the filter element, and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the outside of the peak and valley folds. It is suitable for harsh operating conditions where the operating air volume is greater than the rated air volume, including when the air filtration system has a small resistance margin and needs to cope with the increase in air volume during the operation of the filter.

[0045] L s =1H, L t,1 =L t,2 =0.5H. Through testing, the filter's resistance at different wind speeds is compared to that of continuous adhesive as follows: air volume <![CDATA[1700m 3 / h]]> <![CDATA[2550m 3 / h]]> <![CDATA[3400m 3 / h]]> <![CDATA[4250m 3 / h]]> Resistance in continuous glue mode / Pa 145 245 365 500 Resistance in Mode 1 (Pa) 75 120 170 235 At this point, the glue usage saving rate θ = [(2H-H) / 2H]*100% = 50%, with a rated airflow of 3400m³ / h. 3 At / h, the resistance decreases to [(365-170) / 365]*100%≈53%.

[0046] Mode 2: The adhesive line covers the peaks and valleys of each fold of the filter element, and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the inside of the peak and valley folds. It is suitable for operating conditions where the air volume is close to or lower than the rated air volume, and for application scenarios where cost control is required, but the resistance characteristics need to be kept constant.

[0047] L s =0.9H, L t,1 =L t,2 =0.55H. Through testing, the filter's resistance at different wind speeds is compared with that of continuous adhesive as follows: air volume <![CDATA[1700m 3 / h]]> <![CDATA[2550m 3 / h]]> <![CDATA[3400m 3 / h]]> <![CDATA[4250m 3 / h]]> Resistance in continuous glue mode / Pa 145 245 365 500 Resistance in Mode 2 (Pa) 130 220 325 445 At this point, the glue usage saving rate θ = [(2H - 0.9H) / 2H] * 100% = 55%, with a rated airflow of 3400m³ / h. 3 At / h, the resistance decreases to [(365-325) / 365]*100%≈11%.

[0048] Mode 3: The adhesive line covers the peaks and valleys of each fold of the filter element, and at the same time, an intermittent adhesive line pattern of top support + middle ventilation + bottom support is formed on the inner and outer sides of the peak and valley folds. It is suitable for conventional working conditions where there is a need to optimize both cost and resistance.

[0049] L s =0.8H, L t,1 =L t,2 =0.2H. Through testing, the filter's resistance at different wind speeds is compared to that of continuous adhesive as follows: air volume <![CDATA[1700m 3 / h]]> <![CDATA[2550m 3 / h]]> <![CDATA[3400m 3 / h]]> <![CDATA[4250m 3 / h]]> Resistance in continuous glue mode / Pa 145 245 365 500 Resistance in Mode 3 (Pa) 125 205 290 400 At this point, the glue usage saving rate θ = [(2H - 0.8H) / 2H] * 100% = 60%, with a rated airflow of 3400m³ / h. 3 At / h, the resistance decreases to [(365-290) / 365]*100%≈20%.

[0050] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A non-segmented filter for intermittent hot melt adhesive lines, comprising an outer frame (1) and a filter element (4) disposed within the outer frame (1), wherein the filter element (4) comprises filter media (41) and hot melt adhesive for fixing the pleats of the filter media, characterized in that: Several hot melt adhesive lines (3) are provided on the surface of the filter material (41). The hot melt adhesive lines (3) are linear adhesives formed by hot melt adhesive being applied to the surface of the filter material.

2. The intermittent hot melt adhesive line filter without separators as described in claim 1, characterized in that: The filter media (41) includes several pleats (42), and two adjacent pleats are connected end to end to form the filter media (41); the pleats include a left pleat surface (43) and a right pleat surface (44), and the left pleat surface (43) and the right pleat surface (44) are connected at the pleat peak (45) / pleat valley (46).

3. The intermittent hot melt adhesive line filter without separators as described in claim 1, characterized in that: The hot melt adhesive line (3) extends perpendicular to the height direction of the filter material (41). The hot melt adhesive line (3) is distributed in a matrix. Vertically adjacent hot melt adhesive lines (3) are parallel to each other, and horizontal hot melt adhesive lines (3) are located at the same height.

4. The intermittent hot melt adhesive line filter without separators as described in claim 3, characterized in that: The hot melt adhesive line (3) is the support section (5) of the filter element (4), and the adjacent hot melt adhesive lines (3) at the same height are the air-permeable section (6) of the filter element (4). The lengths of the support sections (5) of the air inlet / air outlet of the filter material (41) are all equal, and the lengths of the air-permeable sections (6) of the air inlet / air outlet of the filter material (41) are all equal.

5. The intermittent hot melt adhesive line filter without separators as described in claim 4, characterized in that: Each pleat of the filter material (41) is provided with a support section (5) and a breathable section (6), and the support section (5) and the breathable section (6) of each pleat are centrally symmetrically distributed after unfolding.

6. The intermittent hot melt adhesive line filter without separators as described in claim 5, characterized in that: The hot melt adhesive line (3) extends from the pleat peak (45) / pleat valley (46) of each pleat of the filter material (41) to the left pleat surface (43) and the right pleat surface (44), and the hot melt adhesive line (3) extending from the pleat peak (45) does not overlap with the hot melt adhesive line (3) extending from the pleat valley (46). The hot melt adhesive line (3) is located outside the pleat peak (45) and pleat valley (46), inside the pleat peak (45) and pleat valley (46), or simultaneously inside and outside the pleat peak (45) and pleat valley (46).

7. The intermittent hot melt adhesive line filter without separators as described in claim 5, characterized in that: The hot melt adhesive line (3) is located in the middle section of the left pleated surface (43) and the right pleated surface (44), and is located on the left and right sides of the left pleated surface (43) and the right pleated surface (44).

8. The intermittent hot melt adhesive line filter without separators as described in claim 1, characterized in that: The outer frame (1) is provided with protective nets (2) on both the front and rear sides, and the pleats (45) and troughs (46) of the filter material (41) face the protective nets (2).

9. A method for selecting the discontinuity mode of a hot melt adhesive line for a filter according to claims 1-7, characterized in that: Includes the following steps: S1: Select the positions of the support section (5) and the ventilation section (6) according to the air volume; When the operating air volume is greater than the rated air volume, the hot melt adhesive line (3) extends from the pleat peak (45) / pleat valley (46) of each pleat of the filter material (41) to the left pleat surface (43) and the right pleat surface (44), and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the outside of the pleat peak (45) and pleat valley (46). When the operating air volume is close to or lower than the rated air volume, and there are requirements to control costs, but the resistance characteristics need to be kept constant, the hot melt adhesive line (3) extends from the pleat peak (45) / pleat valley (46) of each pleat of the filter material (41) to the left pleat surface (43) and the right pleat surface (44), and forms an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the inside of the pleat peak (45) and pleat valley (46); In conventional operating conditions where there is a need to optimize both cost and resistance, the hot melt adhesive line (3) extends from the pleat peak (45) / pleat valley (46) of each pleat of the filter material (41) to the left pleat surface (43) and the right pleat surface (44), while forming an intermittent adhesive line pattern of top support + middle ventilation + bottom support on the inner and outer sides of the pleat peak (45) and pleat valley (46). When the operating air volume is close to or lower than the rated air volume, and the airflow channel is required to be relatively unobstructed and the resistance is lower, the hot melt adhesive line (3) is located in the middle section of the left pleated surface (43) and the right pleated surface (44), and is located on the left and right sides of the left pleated surface (43) / right pleated surface (44), forming an intermittent adhesive line pattern of upper ventilated section + middle support section + lower ventilated section. S2: Calculate the lengths of the support section (5) and the ventilation section (6); L t +L s =2H; L s =L s,1 +L s,2 +...+L s,i ; L t =L t,1 +L t,2 +...+L t,i ; Among them, L s L is the total effective support length of the inner and outer single-sided hot melt adhesive lines on a single fold. s,i The length of a single hot melt adhesive segment on a single-pleated filter element, 0 < L s,i <2H,L t L is the total length of the breathable area on the inner and outer sides of a single pleat without hot melt adhesive lines. t,i The length of a single air-permeable section on a single-pleated filter element, 0 < L t,i <2H, where H is the depth of a single fold after the filter paper is folded, and the range of H is 100-300mm; Measure H, set L s Calculate L t L t,i L s,i ; S3: Calculate the length percentage of the hot melt adhesive line (3); n=L s / (L) s +L t ); Where η is the proportion of adhesive thread length, reflecting the amount of adhesive thread used and the support density; The calculated η should be within the range of 30% to 60% to ensure sufficient support while preventing excessive resistance. S4: Calculate the glue thread consumption saving rate; θ=[(2H-L s ) / 2H]*100%; Where θ is the glue line usage saving rate; S5: Set the spacing between two adjacent rubber strips (3) on the same airflow side; L m The spacing between two adjacent rubber strips (3) on the same airflow side is 1 inch ≤ L m ≤2 inch; If the hot melt adhesive lines (3) on the filter media (41) are arranged at equal intervals, then L m If the hot melt adhesive lines (3) on the filter material (41) are not evenly spaced, then L m They are not equal; S6: Set the hot melt adhesive line (3) according to the data obtained in steps S1-S5.

10. The method for selecting the intermittent mode of the intermittent hot melt adhesive line filter as described in claim 8, characterized in that: In step S2, L s,1 =L s,2 =...=L s,i L t,1 =L t,2 =...=L t,i Both the support section (5) and the breathable section (6) are evenly distributed; L s ≥L s0 ,L t ≤L t0 ; Among them, L s0 To ensure that the filter element (4) will not deform when the filter is running at its rated airflow, the minimum support section length is 0.8H≤L. s0 ≤1.6H, L t0 To ensure that the airflow can normally pass through the filter element (4) without local collapse when the filter is running at the rated air volume, the maximum permeable section length is 0.4H≤L. t0 ≤1.2H.

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