Breather valve and method of processing the same

Abstract

This invention discloses a breathable valve and its processing method. The breathable valve includes a substrate, a base mounted on the substrate, and mounting holes on the base. A polymer film is bonded to the top of the base by an adhesive film. The substrate has through holes matching the mounting holes. The adhesive film includes a modified polyolefin material layer, a polyolefin resin material layer, and a first low-melting-point polyolefin material layer connected sequentially from bottom to top. The polymer film includes a second low-melting-point polyolefin material layer and a high-melting-point polyolefin resin layer connected sequentially from bottom to top. A polyolefin elastomer is disposed in the high-melting-point polyolefin resin layer. The processing method includes removing burrs from the integrally formed substrate and base and performing surface treatment; and fusing the polymer film onto the base.

Description

Technical Field

[0001] This invention relates to the field of vent valves, and more specifically to a vent valve and its processing method. Background Technology

[0002] Currently, explosion-proof valves designed for sealed housings are designed to release pressure when the internal pressure reaches a certain value, thus ensuring the safety of the sealed housing. However, once the explosion-proof valve is released, the product's lifespan ends or it becomes unusable, even though the product may still be under warranty, which increases the product's operating costs. Of course, if the explosion-proof valve fails to open within the designed pressure limit, it will lead to serious safety issues and cause incalculable losses. Summary of the Invention

[0003] The technical problem this invention aims to solve is that existing explosion-proof valves, when the internal pressure of the sealed housing reaches a certain value, open the valve to relieve pressure and ensure the safety of the sealed housing. However, when the explosion-proof valve is opened, the product's lifespan ends or it becomes unusable, even though the product may still be under warranty, thus increasing the product's operating costs. This invention provides a vent valve and a method for processing the vent valve. The vent valve installed on the sealed housing can maintain the sealed housing in a low internal pressure state, thereby ensuring the product's safety performance. When the internal pressure of the housing is greater than the external environmental pressure, the internal gas is released to the outside through the vent valve, achieving dynamic equilibrium with the external environment and keeping the sealed housing in a low internal pressure state at all times. Using a continuous processing mode with a substrate and base continuous strip can improve the production efficiency of drilling and forming, as well as the production efficiency of surface treatment and encapsulation fusion, realizing fully automated production and greatly reducing production costs, thereby solving the defects caused by the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, a breathable valve includes a substrate, a base mounted on the substrate, a mounting hole on the base, and a polymer film bonded to the top of the base by an adhesive film. The substrate has through holes matching the mounting hole. The adhesive film includes a modified polyolefin material layer, a polyolefin resin material layer, and a first low-melting-point polyolefin material layer connected sequentially from bottom to top. The polymer film includes a second low-melting-point polyolefin material layer and a high-melting-point polyolefin resin layer connected sequentially from bottom to top. The high-melting-point polyolefin resin material layer contains a polyolefin elastomer.

[0006] In the above-mentioned vent valve, the substrate is circular, quadrilateral, or polygonal, the base is circular, quadrilateral, or polygonal and matches the substrate, and the support pad is circular, quadrilateral, or polygonal and matches the substrate.

[0007] The top of the base is on the same horizontal plane as or higher than the top of the substrate. If the top of the base is higher than the top of the substrate, a support pad is installed in the mounting hole of the base. If the top of the base is on the same horizontal plane as the top of the substrate, a support pad may or may not be installed in the mounting hole of the base.

[0008] In one of the above-mentioned vent valves, the top of the support pad is lower than the top of the base, and the support pad may or may not penetrate the through hole;

[0009] One or more mounting holes are provided, and multiple through holes are provided to match the mounting holes. The support pad is installed at each mounting hole.

[0010] In one of the above-mentioned vent valves, the supporting pad extends through the through hole and partially protrudes out of the through hole;

[0011] If the support pad does not penetrate the through hole, the diameter of the through hole is smaller than the diameter or side length of the support pad.

[0012] In the aforementioned vent valve, the substrate is made of any one of the following materials: aluminum, aluminum alloy, aluminum with nickel plating, aluminum alloy with nickel plating, copper with nickel plating, copper alloy with nickel plating, stainless steel, and stainless steel with nickel plating.

[0013] The base is made of any one of the following materials: aluminum, aluminum alloy, aluminum with nickel plating, aluminum alloy with nickel plating, copper with nickel plating, copper alloy with nickel plating, stainless steel, and stainless steel with nickel plating.

[0014] The support pad is made of any one of the following materials: polymer material, foamed copper material, or foamed nickel material;

[0015] The modified polyolefin material layer contains polar groups and has a melting point of 140°C to 170°C.

[0016] The melting point of the polyolefin resin material layer is above 160°C;

[0017] The melting point of the first low-melting-point polyolefin material layer is 110℃~140℃;

[0018] The melting point of the second low-melting-point polyolefin material layer is 110℃~170℃;

[0019] The melting point of the high-melting-point polyolefin resin material layer is above 200°C.

[0020] In the aforementioned vent valve, the thickness ratio of the modified polyolefin material layer to the polyolefin resin material layer to the first low-melting-point polyolefin material layer is not less than 2:6:2, or the thickness ratio of the modified polyolefin material layer to the first low-melting-point polyolefin layer is not less than 2:8.

[0021] The second low-melting-point polyolefin material layer: the high-melting-point polyolefin material layer: the thickness ratio of the second low-melting-point polyolefin material layer is not less than 1:8:1, or the thickness ratio of the second low-melting-point polyolefin material layer: the high-melting-point polyolefin material layer is not less than 1:9.

[0022] In the aforementioned vent valve, the first low-melting-point polyolefin material layer and the second low-melting-point polyolefin material layer can be replaced by the modified polyolefin material layer;

[0023] The polar group is one or more of carboxyl, hydroxyl, double bond, carbonyl, and amino groups.

[0024] Secondly, a method for processing a vent valve, comprising the following steps:

[0025] The integrally molded substrate and base are deburred and then surface-treated.

[0026] The polymer film is fused onto the substrate.

[0027] The above-mentioned method for processing a vent valve includes the following specific steps for surface treatment of the integrally formed substrate and base after deburring:

[0028] Multiple integrally formed substrates and bases are processed into continuous rolls using high-speed stamping equipment, followed by ultrasonic acid etching, high-pressure spray water rinsing, unwinding, ultrasonic degreasing, hot degreasing 1, hot degreasing 2, three-stage water washing, activation, three-stage water washing, electroplating, three-stage water washing, drying, passivation treatment 1, three-stage water washing, drying, passivation treatment 2, three-stage water washing, sealing treatment, three-stage water washing, drying, and rewinding to obtain a continuous strip of substrates and bases.

[0029] The ultrasonic degreasing, the thermal degreasing 1, and the thermal degreasing 2 all use alkaline degreasing agents;

[0030] The activation is performed by acid washing activation;

[0031] The electroplating is a Ni layer electroplating;

[0032] The passivation treatment 1 is a chromium-free silane film treatment or a chromium coating film treatment;

[0033] The passivation treatment 2 is either a chromium-free silane film treatment or a chromium coating film treatment;

[0034] The sealing treatment is carried out under alkaline conditions;

[0035] The winding device includes automatic correction and positioning functions.

[0036] The above-mentioned method for processing a breathable valve, wherein the specific method for fusing the polymer film onto the base is as follows:

[0037] The continuous strip of substrate and base is unwound, guided, height positioned, corrected, shaped, positioned 1, adhesive film punching, preheated and pressed adhesive film, venting, high temperature encapsulation, adhesive film punching, positioned 2, support liner punching, support liner embedding, positioned 3, polymer film punching, preheated and pressed polymer film, venting, high temperature encapsulation, and unloading.

[0038] The height positioning refers to the control of the height position of the material belt by the upper and lower height roller devices.

[0039] The correction device is an infrared optical sensing positioning and correction device;

[0040] The shaping process involves multi-level upper and lower silicone roller pressing.

[0041] Positioning 1 refers to the precise positioning of the step hole of the continuous strip between the substrate and the base.

[0042] The adhesive film is punched using a die-cutting device. The adhesive film is a composite film consisting of a modified polyolefin material layer, a polyolefin material layer, and a first low-melting-point polyolefin material layer.

[0043] The preheating and pressing of the adhesive film and the exhaust are achieved by resistance wire heating.

[0044] The high-temperature packaging is achieved through magnetic heating or electric current heating.

[0045] The adhesive film is punched using a die-cutting device;

[0046] Positioning 2 is the precise positioning of the step hole of the continuous strip between the substrate and the base;

[0047] The supporting liner is punched using a die-cutting device;

[0048] Positioning 3 refers to the precise positioning of the step hole of the continuous strip between the substrate and the base.

[0049] The polymer film is punched using a die-cutting device, and the polymer film consists of a second low-melting-point polyolefin material layer and a high-melting-point polyolefin material layer.

[0050] The preheating and pressing of the polymer film and the exhaust are achieved by resistance wire heating.

[0051] The high-temperature encapsulation of the polymer film is achieved by resistance wire heating, magnetic induction heating, or current heating.

[0052] The blanking process involves cutting a continuous strip of material from the substrate and base into individual vent valves using a stamping die.

[0053] The process for the polymer film material is as follows: feeding, extrusion, casting, winding, and slitting;

[0054] The feeding process involves feeding raw materials into the feed hopper, with modified polyolefin particles fed into feed hopper 1 for the adhesive film, polyolefin particles fed into feed hopper 2, and first low-melting-point polyolefin particles fed into feed hopper 3.

[0055] The polymer film is fed into silo 1 with a second low-melting-point polyolefin material, into silo 2 with high-melting-point polyolefin particles, and into silo 3 with a second low-melting-point polyolefin particles.

[0056] The hoppers 1, 2, and 3 are the feeding ports of the casting machine.

[0057] The extrusion is the melt extrusion of polyolefin particles inside a screw extruder;

[0058] The casting sheet is a thick sheet of a certain thickness cast from extruded polyolefin fluid through the gap of the die lip;

[0059] The winding process involves casting a thick sheet of film and then winding it into a film roll using an automatic tension wheel.

[0060] The slit film material is then cut into fixed dimensions using a circular blade.

[0061] The technical solution of the present invention, which provides a breathable valve and its processing method, has the following technical effects:

[0062] The vent valve installed on the sealed housing can keep the sealed housing in a low internal pressure state, thereby ensuring the safety performance of the product. When the pressure inside the housing is greater than the pressure of the external environment, the internal gas is released to the outside through the vent valve, achieving dynamic balance with the external environment, so that the sealed housing always maintains a low internal pressure state.

[0063] The continuous processing mode using continuous strips of substrate and base can improve the production efficiency of drilling and forming, as well as surface treatment and encapsulation fusion, realizing fully automated production and greatly reducing production costs. Attached Figure Description

[0064] Figure 1 This is a side cross-sectional view of the structure of a breathable valve in which the top of the base is higher than the top of the substrate.

[0065] Figure 2 This is a side cross-sectional view of the structure of the top of the base and the top of the substrate in a breathable valve of the present invention, which are on the same horizontal plane.

[0066] Figure 3 This is a diagram illustrating the layered structure of the adhesive membrane and polymer film in a breathable valve according to the present invention.

[0067] Figure 4 This is a top view schematic diagram of two usage states of a vent valve according to the present invention;

[0068] Figure 5 This is a side cross-sectional view of a breathable valve according to the present invention, in which the top of the base is higher than the top of the substrate and a supporting pad is added.

[0069] Figure 6 This is a side sectional view of a breathable valve according to the present invention, in which the top of the base and the top of the substrate are on the same horizontal plane and a supporting pad is added.

[0070] Figure 7 This is a schematic diagram illustrating the aging peel strength of a breathable valve fully immersed in a mixed reagent according to the present invention.

[0071] Figure 8 This is a top view and a side section diagram of a breathable valve according to the present invention, in which the top of the base is higher than the top of the substrate and multiple supporting pads are added.

[0072] Figure 9 This is a schematic diagram of a structure in which a substrate and base are integrally formed and processed into a continuous roll using high-speed stamping equipment.

[0073] The reference numerals in the attached figures are as follows:

[0074] Substrate 100, base 200, mounting hole 300, adhesive film 400, polymer film 500, through hole 600, support pad 700, modified polyolefin material layer 401, polyolefin resin material layer 402, first low melting point polyolefin material layer 403, second low melting point polyolefin material layer 501, and high melting point polyolefin resin material layer 502. Detailed Implementation

[0075] In order to make the technical means, inventive features, objectives and effects of the invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific illustrations. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0076] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0077] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0078] Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0079] The first embodiment of the present invention provides a vent valve, and the second embodiment provides a processing method for the vent valve. The purpose is that the vent valve installed on the sealing shell can keep the sealing shell in a low internal pressure state, thereby ensuring the safety performance of the product. When the pressure inside the shell is greater than the pressure of the external environment, the internal gas is released to the outside through the vent valve, achieving dynamic balance with the external environment, so that the sealing shell always maintains a low internal pressure state. The continuous processing mode using a continuous strip of substrate and base can improve the production efficiency of drilling and forming, as well as the production efficiency of surface treatment and encapsulation fusion, realizing fully automated production and greatly reducing production costs.

[0080] like Figure 1-3 As shown, in a first aspect, a first embodiment, a breathable valve includes a substrate 100, a base 200 mounted on the substrate 100, a mounting hole 300 on the base 200, and a polymer film 500 bonded to the top of the base 200 by an adhesive film 400. The substrate 100 has through holes 600 matching the mounting holes 300. The adhesive film 400 includes a modified polyolefin material layer 401, a polyolefin resin material layer 402, and a first low-melting-point polyolefin material layer 403 connected sequentially from bottom to top. The polymer film 500 includes a second low-melting-point polyolefin material layer 501 and a high-melting-point polyolefin resin layer 502 connected sequentially from bottom to top. The high-melting-point polyolefin resin layer 502 contains a polyolefin elastomer.

[0081] like Figure 4 and Figure 5 As shown, in the above-mentioned vent valve, the base plate 100 is circular, quadrilateral or polygonal, the base 200 is circular, quadrilateral or polygonal matching the base plate 100, and the support pad 700 is circular, quadrilateral or polygonal matching the base plate 100.

[0082] like Figure 2 As shown, the top of the base 200 is on the same horizontal plane as the top of the substrate 100 (for a flat vent valve) or higher than the top of the substrate 100 (for a thumbtack vent valve, such as...). Figure 1 As shown), the top of the base 200 is higher than the top of the substrate 100, and a support pad 700 is installed in the mounting hole 300 of the base 200 (as shown). Figure 5 As shown), the top of the base 200 is on the same horizontal plane as the top of the substrate 100, and the base 200 is installed in the mounting hole 300 (as shown). Figure 6 (As shown) or without the support pad 700, the added adhesive film 400 and support pad 700 can greatly reduce the deformation of the polymer film 500 after encapsulation (especially when the hole size is large), thereby improving the reliability of the polymer film 500. Without the adhesive film 400 and support pad 700, the polymer film 500 will show obvious deformation after encapsulation.

[0083] The support liner 700 has good air permeability and excellent corrosion resistance. The support liner 700 and the polymer film 500 are used in a 1.0 mol / L LiPF6, V solution. EC V DMC V EMC = 1:1:1 (containing 1000ppm water) or mixed reagent 1.0mol / L LiPF6,V EC V DEC V EMC It does not dissolve or decompose in a 1:1:1 solution (containing 1000 ppm of water);

[0084] The aging permeability of the vent valve after being fully immersed in the mixed reagent and baked at 85°C for 1 to 30 days is shown in Table 1 below:

[0085]

[0086] Table 1

[0087] The aging peel strength of the vent valve after being completely immersed in the mixed reagent and baked at 85°C for 1 to 30 days is as follows: Figure 7 As shown;

[0088] In the aforementioned vent valve, the top of the support pad 700 is lower than the top of the base 200, with a height difference within 0.5mm, and the support pad 700 may or may not penetrate the through hole 600.

[0089] like Figure 8 As shown, there are one or more mounting holes 300, and multiple through holes 600 are provided to match the mounting holes 300. A support pad 700 is installed at each mounting hole 300.

[0090] In the aforementioned vent valve, the support pad 700 extends through the through hole 600 and partially protrudes from the through hole 600. The top diameter or side length of the support pad 700 is slightly smaller than the diameter or side length of the through hole 600 to facilitate insertion.

[0091] The support pad 700 does not penetrate the through hole 600, and the diameter of the through hole 600 is smaller than the diameter or side length of the support pad 700.

[0092] In the aforementioned vent valve, the substrate 100 is made of any one of the following materials: aluminum, aluminum alloy, aluminum with nickel plating, aluminum alloy with nickel plating, copper with nickel plating, copper alloy with nickel plating, stainless steel, and stainless steel with nickel plating.

[0093] The base 200 is made of any one of the following materials: aluminum, aluminum alloy, aluminum with nickel plating, aluminum alloy with nickel plating, copper with nickel plating, copper alloy with nickel plating, stainless steel, and stainless steel with nickel plating.

[0094] The support pad 700 is made of any one of the following materials: polymer material, foamed copper material, or foamed nickel material;

[0095] The modified polyolefin material layer 401 contains polar groups, has a melting point of 140℃~170℃, and has strong adhesion to metals.

[0096] The melting point of the polyolefin resin material layer 402 is above 160℃;

[0097] The melting point of the first low-melting-point polyolefin material layer 403 is 110℃~140℃;

[0098] The melting point of the second low-melting-point polyolefin material layer 501 is 110℃~170℃;

[0099] The high-melting-point polyolefin resin material layer 502 has a melting point of over 200℃.

[0100] In the aforementioned vent valve, the thickness ratio of the modified polyolefin material layer 401: the polyolefin resin material layer 402: the first low-melting-point polyolefin material layer 403 is not less than 2:6:2, or the thickness ratio of the modified polyolefin material layer 401: the first low-melting-point polyolefin material layer 403 is not less than 2:8.

[0101] The thickness ratio of the second low-melting-point polyolefin material layer 501 to the high-melting-point polyolefin material layer 501 is not less than 1:8:1, or the thickness ratio of the second low-melting-point polyolefin material layer 501 to the high-melting-point polyolefin material layer is not less than 1:9.

[0102] In the aforementioned vent valve, the first low-melting-point polyolefin material layer 403 and the second low-melting-point polyolefin material layer 501 can be replaced by a modified polyolefin material layer 401.

[0103] The polar group is one or more of the following: carboxyl, hydroxyl, double bond, carbonyl, and amino.

[0104] A comparison of the air permeability (CO2 permeation) of polymer film 500 and conventional film (room temperature @ 0% RH) shows that by adjusting the ratio of polyolefin resin and polyolefin elastomer resin, the air permeability of the film layer can be greatly improved. The test results are shown in Table 2.

[0105] NO Polymer film 500 conventional membrane 1 10990.2 cm 3 / m 2 • 24 h • 0.1 MPa 2370.6 cm 3 / m 2 • 24 h • 0.1 MPa 2 11695.7 cm 3 / m 2 • 24 h • 0.1 MPa 1970.5 cm 3 / m 2 • 24 h • 0.1 MPa 3 11118.2 cm 3 / m 2 • 24 h • 0.1 MPa 2381.1 cm 3 / m 2 • 24 h • 0.1 MPa 4 <![CDATA[10792.6cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[2409.2cm 3 / m 2 ·24h·0.1Mpa]]> 5 <![CDATA[10141.5cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[1987.6cm 3 / m 2 ·24h·0.1Mpa]]>

[0106] Table 2

[0107] The air permeability (CO2 permeation) of the polymer film 500 and the conventional film in the cavity test (35℃@0%RH) is compared (conditions: high-pressure cavity CO2, low-pressure cavity vacuum, partial pressure 0.1 MPa, temperature 35℃, humidity 0%RH) is shown in Table 3:

[0108] NO Polymer film 500 conventional membrane 1 <![CDATA[12991.9cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[3551.9cm 3 / m 2 ·24h·0.1Mpa]]> 2 <![CDATA[11941.5cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[2913.5cm 3 / m 2 ·24h·0.1Mpa]]> 3 <![CDATA[10763.1cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[2594.5cm 3 / m 2 ·24h·0.1Mpa]]> 4 <![CDATA[12983.5cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[3504.0cm 3 / m 2 ·24h·0.1Mpa]]> 5 <![CDATA[11912.4cm 3 / m 2 ·24h·0.1Mpa]]> <![CDATA[2889.1cm 3 / m 2 ·24h·0.1Mpa]]>

[0109] Table 3

[0110] Simulation test of air permeability after encapsulation of the vent valve and soft shell: 200g of mixed reagent 1.0mol / L LiPF6 was injected. EC V DMC V EMC = 1:1:1 (containing 1000ppm water) or mixed reagent 1.0mol / L LiPF6,V EC V DEC V EMC =1:1:1 (containing 1000ppm water), baked at a constant temperature of 85℃, and the deformation of the shell was observed. The results are shown in Table 4:

[0111]

[0112] Table 4

[0113] In a second aspect, according to a second embodiment, a method for processing a vent valve includes the following steps:

[0114] The integrally formed substrate 100 and base 200 are deburred and then surface treated.

[0115] The polymer film 500 is fused onto the base 200.

[0116] The above-mentioned method for processing a vent valve includes the following specific method for surface treatment of the integrally formed substrate 100 and base 200 after deburring:

[0117] like Figure 9As shown, multiple integrally formed substrates 100 and bases 200 are processed into continuous rolls using high-speed stamping equipment, followed by ultrasonic acid etching, high-pressure spray water rinsing, unwinding, ultrasonic degreasing, hot degreasing 1, hot degreasing 2, three-stage water washing, activation, three-stage water washing, electroplating, three-stage water washing, drying, passivation treatment 1, three-stage water washing, drying, passivation treatment 2, three-stage water washing, sealing treatment, three-stage water washing, drying, and rewinding to obtain a continuous strip of substrates 100 and bases 200.

[0118] Ultrasonic degreasing, thermal degreasing 1, and thermal degreasing 2 all use alkaline degreasing agents;

[0119] Activation is performed by acid washing.

[0120] Electroplating is a Ni layer electroplating;

[0121] Passivation treatment 1 is either chromium-free silane film treatment or chromium coating film treatment;

[0122] Passivation treatment 2 is either chromium-free silane film treatment or chromium coating film treatment;

[0123] The sealing process is carried out under alkaline conditions;

[0124] The winding device includes automatic correction and positioning functions.

[0125] The above-mentioned method for processing a breathable valve includes the following specific method for fusing the polymer film 500 onto the base 200:

[0126] The continuous strip unwinding, guiding, height positioning, correction, shaping, and positioning of substrate 100 and base 200; punching of adhesive film 400; preheating and pressing of adhesive film 400; venting; high-temperature encapsulation; punching of adhesive film 400; positioning; punching of support pad 700; embedding of support pad 700; positioning; punching of polymer film 500; preheating and pressing of polymer film 500; venting; high-temperature encapsulation; and unloading.

[0127] The height positioning is controlled by the upper and lower height roller devices to control the height position of the material belt;

[0128] The correction device uses infrared light sensing for positioning and correction.

[0129] The shaping process involves multi-level upper and lower silicone roller pressing.

[0130] Positioning 1 is for precise positioning of the pitch holes of the continuous strip between the substrate 100 and the base 200.

[0131] The adhesive film 400 is punched using a die-cutting device. The adhesive film 400 is a composite film consisting of a modified polyolefin material layer 401, a polyolefin material layer, and a first low-melting-point polyolefin material layer 403.

[0132] Preheating and pressing the adhesive film 400, exhaust is achieved by resistance wire heating;

[0133] High-temperature packaging uses either magnetic heating or electric current heating.

[0134] The 400mm perforated adhesive film is punched using a die-cutting device;

[0135] Positioning 2 is used for precise positioning of the pitch holes of the continuous strip between the substrate 100 and the base 200.

[0136] The 700 support pads are punched using a die-cutting device.

[0137] Positioning 3 is used for precise positioning of the pitch holes of the continuous strip between the substrate 100 and the base 200.

[0138] The polymer film 500 is punched using a die-cutting device. The polymer film 500 is a composite film consisting of a second low-melting-point polyolefin material layer and a high-melting-point polyolefin material layer.

[0139] Preheating and pressing of the polymer film 500, exhaust is achieved by resistance wire heating;

[0140] The 500 high-temperature encapsulation of the polymer film can be achieved through resistance wire heating, magnetic induction heating, or current heating.

[0141] The continuous strip of material from substrate 100 and base 200 is cut into individual vent valves by stamping and die cutting;

[0142] The process for producing 500-grade polymer film is as follows: feeding, extrusion, casting, winding, and slitting.

[0143] The feeding process involves feeding raw materials into the feed silos. Modified polyolefin particles are fed into silo 1 of the adhesive film 400, polyolefin particles are fed into silo 2, and first low-melting-point polyolefin particles are fed into silo 3.

[0144] The second low-melting-point polyolefin material is put into silo 1 of polymer film 500, the high-melting-point polyolefin particles are put into silo 2, and the second low-melting-point polyolefin particles are put into silo 3.

[0145] Bins 1, 2, and 3 are the feeding ports of the casting machine.

[0146] Extrusion involves the melt extrusion of polyolefin particles within a screw extruder.

[0147] The casting sheet is a thick sheet of a certain thickness formed by extruding polyolefin fluid through the gap of the die lip;

[0148] The cast thick film is wound into a roll material by an automatic tension roller;

[0149] The slit film material is then cut into fixed dimensions using a circular blade.

[0150] Table 5 compares the processing methods of a single substrate 100 and base 200 with those of the substrate 100 and base 200 strip processing:

[0151] Comparison items Single-piece processing Continuous processing of material strip Surface treatment The equipment is complex and difficult to process continuously. It can achieve continuous processing at a rate of 5m per minute, or 200pcs. Encapsulation fusion The equipment is complex and difficult to automate. It can achieve continuous packaging and fusion, 32 pieces per minute.

[0152] Table 5

[0153] In summary, the vent valve and its processing method of the present invention enable the vent valve installed on the sealing housing to maintain the sealing housing in a low internal pressure state, thereby ensuring the safety performance of the product. When the internal pressure of the housing is greater than the external environmental pressure, the internal gas is released to the outside through the vent valve, achieving dynamic balance with the external environment and keeping the sealing housing in a low internal pressure state at all times. The continuous processing mode using a continuous strip of substrate and base can improve the production efficiency of drilling and forming, as well as the production efficiency of surface treatment and encapsulation fusion, realizing fully automated production and greatly reducing production costs.

[0154] The specific embodiments of the invention have been described above. It should be understood that the invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood to be implemented in a manner common to the art; those skilled in the art can make various modifications or alterations within the scope of the claims, and make several simple deductions, variations or substitutions, which do not affect the substantive content of the invention.

Claims

1. A breather valve characterized by, The application relates to a substrate, a base fixedly integrated on the substrate, a mounting hole arranged on the base, a polymer film bonded to the top of the base through an adhesive film, a through hole arranged on the substrate and matched with the mounting hole, the adhesive film comprising a modified polyolefin material layer, a polyolefin resin material layer and a first low-melting-point polyolefin material layer arranged in sequence from bottom to top, and the polymer film comprising a second low-melting-point polyolefin material layer and a high-melting-point polyolefin resin material layer arranged in sequence from bottom to top, and the high-melting-point polyolefin resin material layer being provided with a polyolefin elastomer. The substrate is made of any one of aluminum, aluminum alloy, aluminum plated with nickel, aluminum alloy plated with nickel, copper plated with nickel, copper alloy plated with nickel, stainless steel and stainless steel plated with nickel; the base is made of any one of aluminum, aluminum alloy, aluminum plated with nickel, aluminum alloy plated with nickel, copper plated with nickel, copper alloy plated with nickel, stainless steel and stainless steel plated with nickel; The modified polyolefin material layer contains a polar group and has a melting point of 140 DEG C to 170 DEG C; The polyolefin resin material layer has a melting point of 160 DEG C or above; The first low-melting-point polyolefin material layer has a melting point of 110 DEG C to 140 DEG C; The second low-melting-point polyolefin material layer has a melting point of 110 DEG C to 170 DEG C; The high-melting-point polyolefin resin material layer has a melting point of 200 DEG C or above.

2. A breather valve as claimed in claim 1, wherein The substrate is circular or polygonal, and the base is circular or polygonal and matched with the substrate; The top of the base is at the same level as or higher than the top of the substrate; when the top of the base is higher than the top of the substrate, the mounting hole of the base is provided with a supporting gasket; when the top of the base is at the same level as the top of the substrate, the mounting hole of the base is provided with or not provided with a supporting gasket, and the supporting gasket is circular or polygonal and matched with the substrate.

3. A breather valve as claimed in claim 2, wherein The top of the supporting gasket is lower than the top of the base, and the supporting gasket penetrates or does not penetrate the through hole; The mounting hole is provided with one or more, and the through hole is provided with a plurality of mounting holes matched with the mounting hole, and the supporting gasket is arranged at each mounting hole.

4. A breather valve as claimed in claim 3, wherein After the supporting gasket penetrates the through hole, part of the supporting gasket protrudes out of the through hole; When the supporting gasket does not penetrate the through hole, the diameter of the through hole is smaller than the diameter or side length of the supporting gasket.

5. A breather valve as claimed in claim 4, wherein The supporting gasket is made of any one of a polymer material, foamed copper material and foamed nickel material.

6. A breather valve as claimed in claim 1, wherein, The thickness ratio of the modified polyolefin material layer to the first low-melting-point polyolefin material layer is not less than 2:8; The thickness ratio of the second low-melting-point polyolefin material layer to the high-melting-point polyolefin resin material layer is not less than 1:

9.

7. A method of manufacturing a vent valve according to any one of claims 1 to 6, characterised in that, The application further discloses a manufacturing method of the substrate and the base. After deburring the integrally formed substrate and base, surface treatment is performed; The polymer film is fused and processed on the base.

8. A method of manufacturing a breather valve as claimed in claim 7, wherein, The specific method of surface treatment after deburring the integrally formed substrate and base is as follows: The plurality of integrally formed substrates and bases are processed into a continuous roll material by using a high-speed stamping device, ultrasonic pickling etching, high-pressure water spraying, roll unwinding, ultrasonic degreasing, thermal degreasing 1, thermal degreasing 2, three-stage water washing, activation, three-stage water washing, electroplating, three-stage water washing, drying, passivation treatment 1, three-stage water washing, drying, passivation treatment 2, three-stage water washing, hole sealing treatment, three-stage water washing, drying, and winding, to obtain a continuous material belt of the substrates and bases; If a support pad is installed in the mounting hole of the base, the specific method for fusing the polymer film onto the base is as follows: The continuous material belt of the substrates and bases is unwound, guided, highly positioned, corrected, shaped, positioned 1, punched by an adhesive film, preheated and pressed to adhere the film, exhausted, high-temperature packaged, punched by the adhesive film, positioned 2, punched by a support pad piece, embedded with the support pad piece, positioned 3, punched by a polymer film, preheated and pressed to adhere the polymer film, exhausted, high-temperature packaged, and cut.

9. A method of manufacturing a breather valve as claimed in claim 8, wherein, The ultrasonic degreasing, the thermal degreasing 1, and the thermal degreasing 2 in the surface treatment after deburring of the integrally formed substrates and bases all use alkaline degreasing agents; The activation uses pickling activation; The electroplating is an electroplated Ni layer; The passivation treatment 1 is a chromium-free silane film treatment or a chromizing film treatment; The passivation treatment 2 is a chromium-free silane film treatment or a chromizing film treatment; The hole sealing treatment is performed under alkaline conditions; The winding device contains automatic correction and positioning functions; The high positioning for fusing the polymer film onto the base is the high-low position of the roll device controlled by the upper and lower height rollers; The correction device is an infrared light sensing positioning correction device; The shaping is multi-level upper and lower silica gel wheel roller pressing; The positioning 1 is accurate positioning of the step distance hole of the continuous material belt of the substrates and bases; The adhesive film punching uses a die cutter device, and the adhesive film is a composite film of a modified polyolefin material layer, a polyolefin material layer, and a first low-melting-point polyolefin material layer; The preheating and pressing of the adhesive film and the exhausting are resistance wire heating methods; The high-temperature packaging is magnetic induction heating or current heating; The adhesive film punching uses a die cutter device; The positioning 2 is accurate positioning of the step distance hole of the continuous material belt of the substrates and bases; The support pad piece punching uses a die cutter device; The positioning 3 is accurate positioning of the step distance hole of the continuous material belt of the substrates and bases; The polymer film punching uses a die cutter device, and the polymer film is a composite film of a second low-melting-point polyolefin material layer and a high-melting-point polyolefin resin material layer; The preheating and pressing of the polymer film and the exhausting are resistance wire heating methods; The high-temperature packaging of the polymer film is resistance wire heating, magnetic induction heating, or current heating; and the cutting is cutting of the continuous material belt of the substrates and bases into single air permeable valves by a punching die; The process method of the polymer film and the adhesive film is as follows: feeding, extruding, casting, winding, and slitting; The feeding is feeding of raw materials into bins, feeding of modified polyolefin particles into bin 1, feeding of polyolefin particles into bin 2, and feeding of first low-melting-point polyolefin particles into bin 3; The second low-melting point polyolefin particles are put into the hopper 1, the high-melting point polyolefin particles are put into the hopper 2, and the second low-melting point polyolefin particles are put into the hopper 3; The hopper 1, the hopper 2, and the hopper 3 are feeding ports of the equipment of the casting machine; The extrusion is melt extrusion of the polyolefin particles in the screw machine; The casting is casting of the extruded polyolefin fluid into a thick sheet with a certain thickness through a die lip gap; The winding is winding of the cast thick sheet film into a film roll through an automatic tension wheel; The slitting is slitting of the wound film material into a certain size through a round blade.

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