A fuel cell membrane electrode assembly and a method for preparing the same

Abstract

The present invention discloses a fuel cell membrane electrode assembly and a preparation method thereof. A stacked structure is formed by a catalytic membrane electrode, a bipolar sealing frame, and a bipolar gas diffusion layer package; each frame plane is provided with a plurality of medium channels located in the center and matching corresponding through holes and at both ends; the edge line of the cathode through hole is 0.5 to 3 mm larger than the edge line of the anode through hole to the outside to form a dislocation structure; the edge of the catalytic membrane electrode package is covered by each frame seal for 1 to 5 mm; the plane shapes of the frame and its through holes are the same or matched, and are positioned and fixed by a connector. The positioning structure design of the membrane electrode assembly of the present invention is simple and practical, which reduces the demand for positioning tooling and is easy to realize flexible production; the middle through hole of the bipolar sealing frame forms a staggered structure of step sealing, which reduces the concentration of stress; based on the design of the frame structure and bonding performance, the hot pressing pressure on the sealing frame in the preparation method of the present invention is lower, the hot pressing time is short, the processing efficiency is higher, and the processing quality is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cell design and manufacturing, in particular to the design and manufacturing technology of a membrane electrode assembly in a fuel cell, and particularly relates to a design and preparation method of a seven-in-one membrane electrode assembly. Background Art

[0002] The fuel cell stack is mainly composed of end plates, insulating plates, current collecting plates, bipolar plates, seals, membrane electrode assemblies, and fastening bolts. For the convenience of assembly, the membrane electrode assembly is assembled after being formed into an integral component by parts such as the catalytic membrane electrode, bipolar sealing frames, and gas diffusion layers.

[0003] The catalytic membrane electrode (CCM) can also be called a three-in-one component, which consists of a proton exchange membrane (PEM) and an anode catalyst layer on one side and a cathode catalyst layer on the other side.

[0004] The membrane electrode assembly (MEA) can also be called a seven-in-one assembly; the so-called three-in-one assembly of the catalytic membrane electrode (CCM) is assembled with the anode side sealing frame and the cathode side sealing frame to form a five-in-one assembly, and the anode side gas diffusion layer and the cathode side gas diffusion layer are assembled on the basis of the five-in-one assembly to form the so-called seven-in-one assembly of the membrane electrode assembly (MEA).

[0005] The two sealing frames of the membrane electrode assembly are provided with through holes corresponding to the bipolar plates for the circulation of materials such as air, hydrogen, and cooling medium involved in the reaction; at the same time, the two sealing frames form an effective bonding seal with the contact part of the three-in-one catalytic membrane electrode (CCM) to prevent leakage of the reaction materials.

[0006] There are many studies on the packaging technology of membrane electrode assembly (MEA) in the prior art. For example, Chinese application 201811194333.7 discloses a fuel cell membrane electrode packaging production process, which mainly aligns the anode side sealing frame and the cathode side sealing frame through pretreatment and then heat seals them laterally, and then places the CCM in the two layers of sealing frames that are initially heat-sealed laterally for hot pressing to form a five-in-one catalytic membrane electrode assembly, which can further form an MEA assembly. The process is relatively complicated by first heat-sealing the sealing frame laterally and then pressing it five-in-one.

[0007] Chinese application 201711336320.4 discloses a method for preparing an MEA component, in which two identical sealing frames are cut out, a catalytic membrane electrode is cut out, and then the sealing frame, the catalytic membrane electrode, and the sealing frame are sequentially stacked and bonded. The upper and lower sealing frames are identical, which may cause stress concentration, and the positioning of the gas diffusion layer is not involved.

[0008] Chinese application 200580032435.3 discloses a membrane electrode assembly in which a thin film element is inserted between a membrane and an electrocatalyst layer, and the components of the MEA are laminated together using a hot press pressure of 230-250 psi and a temperature of 150-190° C. The hot press pressure is relatively large and the temperature is high.

[0009] The existing technology has some deficiencies in the design and processing of membrane electrode assemblies, such as: the positioning and alignment of the components of the membrane electrode assembly is difficult, and it is not suitable for flexible production; the process is complicated, the existing membrane electrode assembly preparation process applies high pressure, the hot pressing time is long, and the efficiency is low. Summary of the invention

[0010] The present invention discloses a fuel cell membrane electrode assembly and a preparation method thereof in view of the shortcomings of the existing membrane electrode assembly design and preparation method. The purpose of the present invention is to provide a membrane electrode assembly structure and a preparation method thereof that can realize flexible production of a seven-in-one membrane electrode assembly, have higher efficiency and better processing performance.

[0011] The present invention is achieved through the following technical solutions:

[0012] The fuel cell membrane electrode assembly is a laminated structure consisting of a catalytic membrane electrode, a cathode side sealing frame, an anode side sealing frame, an anode side gas diffusion layer, and a cathode side gas diffusion layer; the characteristics are:

[0013] The cathode side sealing frame plane is provided with a cathode through hole located in the center and multiple cathode medium channels at both ends; the anode side sealing frame plane is provided with an anode through hole located in the center and multiple anode medium channels at both ends; wherein the cathode medium channel and the anode medium channel are arranged in the same manner in a one-to-one matching manner in the laminated structure, and the edge line of the cathode through hole is 0.5 to 3 mm larger than the edge line of the anode through hole to the outside to form a staggered structure;

[0014] The catalytic membrane electrode package is located between the cathode side sealing frame and the anode side sealing frame, centered at the through hole position, and the edge is sealed and covered by each frame for 1 to 5 mm; the cathode side gas diffusion layer is fixed by bonding to cover the cathode through hole, and the anode side gas diffusion layer is fixed by bonding to cover the anode through hole.

[0015] The plane structures of the cathode side sealing frame and the anode side sealing frame of the present invention can be rectangular frames or other polygonal or other geometric plane shapes, and the cathode through holes and the anode through holes are the same as and match the frame shapes; for example, the plane structures of the cathode side sealing frame and the anode side sealing frame are circular, and the cathode through holes and the anode through holes are also circular; and in any structure of the central through hole, the edge lines of the cathode through holes and the anode through holes form a smoothly transitional arc structure, for example, when the cathode side sealing frame and the anode side sealing frame are rectangular in shape, the cathode through holes and the anode through holes are both rectangular through holes, and the four corners of the rectangular through holes are transitional arc structures.

[0016] Furthermore, the outer edges of the cathode side sealing frame and the anode side sealing frame laminated structure are connected and fixed by a tooling connector.

[0017] The tooling connector for the rectangular frame is a right-angle connector that connects and fixes two adjacent sides of the rectangular frame.

[0018] The cathode side sealing frame and the anode side sealing frame are made by cutting a flat plate whose cross section includes three prefabricated layers, and the three prefabricated layers include: an upper substrate: including a PET film or a PI film; a middle adhesive layer: coated with a flame-retardant adhesive; a lower release layer: covered with a release paper or a release film; the laminated structure constituted by the package is a multi-layer structure formed by bonding after removing the release layer.

[0019] The present invention also discloses a method for preparing the fuel cell membrane electrode assembly, which comprises the following steps:

[0020] S100, preparing catalytic membrane electrode;

[0021] S200, cutting out the cathode side sealing frame and the anode side sealing frame from the sealing frame material, and removing the release layer after the cutting is completed;

[0022] S300, cutting out an anode-side gas diffusion layer and a cathode-side gas diffusion layer from the entire gas diffusion layer;

[0023] S400, on the heating platform of the hot press or laminator, place the cathode side sealing frame, the catalytic membrane electrode, and the anode side sealing frame in sequence; the two ends are pressed against the adjacent two sides of the upper and lower electrode sealing frames through a pair of tooling connectors to align the two sealing frames accurately; adjust the catalytic membrane electrode so that the catalytic membrane electrode is centered at the through holes of the two sealing frames, and perform hot pressing packaging;

[0024] S500, performing quality inspection on the five-in-one component obtained in step S400, including: performing air tightness and bonding quality inspection;

[0025] S600, applying a small amount of glue to the edge of the cathode side gas diffusion layer, at least on two sides; then placing the cathode side gas diffusion layer in the cathode through hole of the cathode side density frame, and positioning the cathode side gas diffusion layer by using the cathode through hole; applying pressure to the glue-coated part until it is bonded; using the same method, bonding and fixing the anode side gas diffusion layer in the anode through hole, and hot pressing the assembly in a hot press or a laminator to obtain a membrane electrode assembly;

[0026] S700: Perform quality inspection on the membrane electrode assembly, including discharge performance and air tightness inspection. Once the inspection is qualified, the preparation of the membrane electrode assembly is completed.

[0027] The parameters of the hot pressing packaging in step S400 are set as follows: the temperature range of the hot pressing machine or laminating machine is 80-120°C, and the pressure range is 1-5 kg / cm 2 , pressing time 8 to 20S.

[0028] The beneficial effects of the present invention: The positioning structure design of the membrane electrode assembly of the present invention is simple and practical. The upper and lower sealing frames are positioned by using tooling connectors, and the corresponding gas diffusion layer is positioned by using the middle through hole of the sealing frame, which reduces the need for complex positioning tooling and facilitates flexible production. The middle through hole of the bipolar sealing frame forms a stepped seal, which is offset on both sides of the catalytic membrane electrode, reducing stress concentration. The smooth transition edge or rounded corner structure of the middle through hole effectively disperses local stress concentration and improves the mechanical reliability and life of the membrane electrode assembly. Based on the design of the frame structure and bonding performance, the hot pressing pressure on the sealing frame in the preparation method of the present invention is lower, the hot pressing time is short, the processing efficiency is higher, and the processing quality is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic cross-sectional view of a membrane electrode assembly of the present invention;

[0030] Figure 2 yes Figure 1 A magnified schematic diagram of the middle part;

[0031] Figure 3 It is a schematic diagram of the sealing frame structure layer of the present invention;

[0032] Figure 4 It is a schematic diagram of the planar structure of the cathode side sealing frame of the present invention;

[0033] Figure 5 It is a schematic plan view of the overlapping structure of the cathode and anode sealing frames of the present invention;

[0034] Figure 6 It is a schematic diagram of the assembly and positioning plane of the five-in-one component of the present invention;

[0035] Figure 7 It is a schematic cross-sectional diagram of the assembly and positioning of the five-in-one component of the present invention;

[0036] Figure 8 It is a flow chart of the preparation method of the present invention.

[0037] In the figure: 1 is the catalytic membrane electrode, 2 is the cathode side sealing frame, 21 is the cathode medium channel, 22 is the cathode through hole, 3 is the anode side sealing frame, 31 is the anode medium channel, 32 is the anode through hole 32, 4 is the anode side gas diffusion layer, 5 is the cathode side gas diffusion layer, 6 is the tooling connection part, 7 is the staggered structure, R is an arc, J is a substrate, Z is an adhesive layer, and L is a release layer. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0039] Combined with the attached pictures.

[0040] As shown in the figure, the fuel cell membrane electrode assembly of the present invention cuts the film substrate J with the adhesive layer Z into two sealing frames of the same shape and different sizes of the central through hole, realizes the precise alignment of the two-pole sealing frames through external positioning, and forms a five-in-one assembly by hot pressing. On the basis of the five-in-one assembly, the gas diffusion layer is bonded and pressed to prepare a seven-in-one membrane electrode assembly. The adhesive layer Z melts and bonds the catalytic membrane electrode 1 under certain temperature and pressure conditions, and the sealing frame and the catalytic membrane electrode 1 are bonded together to form a seal.

[0041] The membrane electrode assembly of the present invention is mainly composed of a catalytic membrane electrode 1, a cathode side sealing frame 2, an anode side sealing frame 3, an anode side gas diffusion layer 4, and a cathode side gas diffusion layer 5.

[0042] The cathode side sealing frame 2 is provided with a plurality of cathode medium channels 21 participating in the reaction, including at least two hydrogen channels, and may also include air / oxygen channels and cooling medium channels according to the use location of the membrane electrode assembly. A cathode through hole 22 is provided in the middle area for placing the catalytic membrane electrode 1. The cathode through hole 22 is smaller than the size of the catalytic membrane electrode 1, and each side can cover the edge of the catalytic membrane electrode 1 by 1-5 mm after overlapping.

[0043] In this example, the cathode side sealing frame 2, the anode side sealing frame 3, the cathode through hole 22, and the anode through hole 32 are rectangular structures, and the four corners of the cathode through hole 22 are provided with rounded corners R. According to design requirements, the cathode side sealing frame 2, the anode side sealing frame 3, the cathode through hole 22, and the anode through hole 32 can also be circular, elliptical, and other geometric plane structures required by the stack design, wherein the edges of the cathode through hole 22 and the anode through hole 32 are continuous and smooth structures.

[0044] The anode side sealing frame 3 is provided with an anode medium channel 31 and an anode through hole 32 and a rounded corner R corresponding to the cathode side sealing frame 2. The sizes of the cathode medium channel 21 and the anode medium channel 31 are consistent; the size of the anode through hole 32 is inconsistent with the size of the cathode through hole 22. After the two overlap, there is a misalignment of 0.5-3mm on each side to form a misalignment structure 7; the arc R on the anode through hole 32 is consistent with that on the cathode through hole 22.

[0045] like Figure 2 As shown, the cathode side sealing frame 2 and the anode side sealing frame 3 , the anode side gas diffusion layer 4 and the cathode side gas diffusion layer 5 on both surfaces of the catalytic membrane electrode 1 form a staggered structure 7 .

[0046] In conventional packaging, the sealing frame is flush from top to bottom. Regardless of whether the gas diffusion layer is covered on the sealing frame or placed in the through hole of the sealing frame, the stress is concentrated at the edge because the stress is transferred to the catalytic membrane electrode, and the stress transfer at the sealing frame is a line-surface-line structure. After the sealing frame of the present invention adopts a staggered structure, it cooperates with the gas diffusion layer in the corresponding through hole, and the stress transfer at the sealing frame is a line-surface-surface structure, thereby dispersing and reducing stress concentration.

[0047] The present invention adopts a smooth continuous transition edge design for the central through hole structure with non-smooth edges such as rectangles, such as rounded corners or arc transitions; the stress of rounded corners or arc transitions is relatively concentrated compared to non-smooth transitions such as right angles, and since the stress at the vertices of non-smooth transitions such as right angles is relatively concentrated, it is easy to cause damage such as sealing, resulting in damage to the components; the present invention uses smooth transition structures such as arcs to disperse the stress over the entire arc line, thereby reducing stress concentration.

[0048] The cathode side sealing frame 2 and the anode side sealing frame 3 are cut from the same material, such as Figure 3 As shown, the frame layer structure material is three layers, including the upper substrate J: PET film, PI film can be used; the middle adhesive layer Z: a ​​low-fluidity flame-retardant adhesive, a hot melt adhesive but cannot be heated repeatedly; the lower layer is a release layer L: it can be a release paper or a release film, which protects the adhesive layer and reduces the dust in the environment from adhering to the adhesive layer. When the cathode side sealing frame 2, the anode side sealing frame 3 and the catalytic membrane electrode 1 are packaged to form a laminated structure, the release layer L needs to be removed before hot pressing packaging.

[0049] The shape and size of the anode-side gas diffusion layer 4 are consistent with the anode through hole 32 in the anode-side sealing frame 3, and the two overlap to form a transition fit.

[0050] The shape and size of the cathode side gas diffusion layer 5 are consistent with the cathode through hole 22 in the cathode side sealing frame 2, and the two overlap to form a transition fit.

[0051] like Figure 6 As shown, the tooling connector 6 in this example is a right angle, preferably magnetic, and has a thickness greater than that of the MEA assembly, and plays a role in positioning the cathode sealing frame 2 and the anode sealing frame 3 during the preparation process. The tooling connector 6 is placed on the workbench, and when assembling, it is only necessary to move the corresponding edges of each sealing frame to the corresponding edges of the tooling connector 6, and fit them tightly, which is convenient for positioning.

[0052] The preparation method comprises the following steps:

[0053] S100, firstly prepare a three-in-one catalytic membrane electrode 1.

[0054] S200, according to the design, the cathode side sealing frame 2 and the anode side sealing frame 3 are respectively cut out from the whole sealing frame material; after the cutting is completed, the release layer L is removed.

[0055] S300, according to the design, cutting out the anode-side gas diffusion layer 4 and the cathode-side gas diffusion layer 5 from the entire gas diffusion layer.

[0056] S400, as attached Figure 6 As shown, on the heating platform of the hot press or laminator, place the cathode side sealing frame 2, the catalytic membrane electrode 1, and the anode side sealing frame 3 in sequence; then, through a pair of tooling connectors 6, close the adjacent two sides of the upper and lower polar sealing frames to align the upper and lower sealing frames accurately. Adjust the catalytic membrane electrode 1 so that the catalytic membrane electrode 1 is centered at the through holes of the two sealing frames. Set the temperature range of the hot press / laminator to 80-120°C and the pressure range to 1-5kg / cm 2 , the pressing time is 8-20S. In order to reduce the generation of bubbles during the hot pressing process, it is preferred to consider performing the process in a laminator that can provide a vacuum environment. Figure 7 5-in-1 assembly shown.

[0057] S500, performing quality inspection on the five-in-one assembly obtained in step S400, including: performing air tightness and bonding effect inspection. After the inspection is qualified, proceed to the next step.

[0058] S600, apply a small amount of glue to the edge of the cathode side gas diffusion layer 5, at least on both sides; then place the cathode side gas diffusion layer 5 in the cathode through hole 22 of the cathode side density frame 2, and use the through holes of the sealing frame to position the gas diffusion layer during the placement process; apply pressure to the glue-coated part until it is bonded; turn over the component with the cathode side gas diffusion layer 5, and apply a small amount of glue to the edge of the anode side gas diffusion layer 4, at least on both sides; then place the anode side gas diffusion layer 4 in the anode through hole 32 of the anode side density frame 3, and use the through holes of the sealing frame to position the gas diffusion layer during the placement process; apply pressure to the glue-coated part until it is bonded. A seven-in-one component is initially formed, and the seven-in-one component is hot pressed in a hot press or a laminator. The hot pressing parameters can refer to the existing disclosed methods. After hot pressing, the following is obtained: Figure 1 The MEA components are shown.

[0059] S700, for example Figure 1 The MEA assembly shown is subjected to quality inspection for discharge performance, air tightness, etc. After passing the inspection, the preparation of the membrane electrode assembly is completed.

[0060] The following is a specific example for explanation:

[0061] 1. Cut the sealing frame, the middle anode through hole 32 of the anode sealing frame 3 placed on the upper side is 1 mm shorter than the sides of the middle cathode through hole 22 of the cathode sealing frame 2 placed on the lower side; that is, after overlapping assembly, the corresponding sides of the middle through holes of the two are staggered by 1 mm, specifically, the upper anode through hole 32 completely covers the lower cathode through hole 22; the fillet R matches.

[0062] 2. The parameters of the two-pole sealing frame used are as follows: PET film thickness 50um, adhesive layer thickness 30um, release film thickness 38um.

[0063] 2. The length of each side of CCM is 2 mm longer than the length of each side of the middle cathode through hole 22 of the lower cathode sealing frame 2; that is, the corresponding surfaces of the two have an overlapping area of ​​2 mm.

[0064] 3. During the hot pressing process of the five-in-one assembly, a hot press is used; the assembly after the upper and lower sealing frames are limited and aligned by the right-angle structure tooling connector 6 is heated at 90°C and 3.8kg / cm 2 Hot pressing for 10S under the conditions.

[0065] 4. Perform a leak test on the five-in-one component. After passing the test, apply a small amount of glue to the four corners of the gas diffusion layer, and then assemble it after positioning through the through hole in the middle of the sealing frame; press the corresponding position where the glue is applied for 10 seconds to form the seven-in-one component in its initial state.

[0066] 5. For the seven-in-one assembly at 92°C, 5.4kg / cm 2 The final MEA assembly was hot pressed for 2 minutes under the conditions of .

[0067] 6. Perform open circuit voltage and air tightness tests on the MEA assembly. If the test results are normal, the preparation of the MEA assembly is completed.

Claims

1. A fuel cell membrane electrode assembly, comprising a catalytic membrane electrode, a cathode side sealing frame, an anode side sealing frame, an anode side gas diffusion layer, and a cathode side gas diffusion layer encapsulated to form a laminated structure; characterized in that: The cathode side sealing frame plane is provided with a cathode through hole located in the center and multiple cathode medium channels at both ends; the anode side sealing frame plane is provided with an anode through hole located in the center and multiple anode medium channels at both ends; wherein the cathode medium channel and the anode medium channel are arranged in the same manner in a one-to-one matching manner in the laminated structure, and the edge line of the cathode through hole is 0.5 to 3 mm larger than the edge line of the anode through hole to the outside to form a staggered structure; The catalytic membrane electrode package is located between the cathode side sealing frame and the anode side sealing frame, centered at the through hole position, and the edge is sealed and covered by each frame for 1 to 5 mm; the cathode side gas diffusion layer is fixed by bonding to cover the cathode through hole, and the anode side gas diffusion layer is fixed by bonding to cover the anode through hole.

2. The fuel cell membrane electrode assembly according to claim 1, characterized in that: The planes of the cathode side sealing frame and the anode side sealing frame are in any geometric shape, the cathode through hole and the anode through hole are in the same shape as and match the frame, and the through hole edges are in a smooth and continuous arc structure.

3. The fuel cell membrane electrode assembly according to claim 2, characterized in that: The cathode side sealing frame and the anode side sealing frame are rectangular frames, the cathode through hole and the anode through hole are rectangular through holes, and the four corners of the rectangular through hole are arc transition structures.

4. The fuel cell membrane electrode assembly according to claim 1, 2 or 3, characterized in that: The outer edges of the cathode side sealing frame and the anode side sealing frame laminated structure are connected and fixed by a tooling connector.

5. The fuel cell membrane electrode assembly according to claim 4, characterized in that: When the cathode side sealing frame and the anode side sealing frame are rectangular frames, the tooling connector is a right-angle connector used to connect and fix two adjacent sides of the rectangular frame.

6. The fuel cell membrane electrode assembly according to claim 4, characterized in that: The cathode side sealing frame and the anode side sealing frame are made by cutting a flat plate whose cross section includes three prefabricated layers, and the three prefabricated layers include: an upper substrate: including a PET film or a PI film; a middle adhesive layer: coated with a flame-retardant adhesive; a lower release layer: covered with a release paper or a release film; the laminated structure constituted by the package is a multi-layer structure formed by bonding after removing the release layer.

7. A method for preparing a fuel cell membrane electrode assembly: characterized in that The following steps are involved: S100, preparing catalytic membrane electrode; S200, cutting out the cathode side sealing frame and the anode side sealing frame from the sealing frame material, and removing the release layer after the cutting is completed; S300, cutting out an anode-side gas diffusion layer and a cathode-side gas diffusion layer from the entire gas diffusion layer; S400, on the heating platform of the hot press or laminator, place the cathode side sealing frame, the catalytic membrane electrode, and the anode side sealing frame in sequence; the two ends are pressed against the adjacent two sides of the upper and lower electrode sealing frames through a pair of tooling connectors to align the two sealing frames accurately; adjust the catalytic membrane electrode so that the catalytic membrane electrode is centered at the through holes of the two sealing frames, and perform hot pressing packaging; S500, performing quality inspection on the five-in-one component obtained in step S400, including: performing air tightness and bonding quality inspection; S600, apply a small amount of glue to the edge of the cathode side gas diffusion layer, at least on both sides; then place the cathode side gas diffusion layer in the cathode through hole of the cathode side density frame, and use the cathode through hole to position the cathode side gas diffusion layer, the cathode through hole edge line is 0.5 to 3 mm larger than the anode through hole edge line to the outside to form a dislocation structure, the middle through hole of the two-pole sealing frame forms a stepped seal, the two sides of the catalytic membrane electrode are dislocated to reduce stress concentration, and the smooth transition edge or rounded corner structure of the middle through hole effectively disperses local stress concentration; press the glue-coated part until it is bonded; in the same way, bond and fix the anode side gas diffusion layer in the anode through hole, and hot-press the assembly in a hot press or laminator to obtain a membrane electrode assembly; S700: Perform quality inspection on the membrane electrode assembly, including discharge performance and air tightness inspection. Once the inspection is qualified, the preparation of the membrane electrode assembly is completed.

8. The method for preparing a fuel cell membrane electrode assembly according to claim 7, characterized in that: The parameters of the hot pressing packaging in step S400 are set as follows: the temperature range of the hot pressing machine or laminating machine is 80-120°C, and the pressure range is 1-5 kg / cm 2 , pressing time 8 to 20S.

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