High-peel-strength vulcanized fiber base paper production line and process for electrical insulation

Abstract

The invention belongs to the technical field of insulation paper, and particularly relates to a high-peel-strength vulcanized fiber base paper production line and process for electrical insulation, and the production line comprises a rack, and a material crushing device, a material boiling device, a pulp washing device, a water filtering device, a drying device and a forming device which are positioned on the rack, an interweaving device is further arranged between the water filtering device and the drying device and comprises a driving mechanism and a needle inserting assembly, and the needle inserting assembly has the movement amount of up-down reciprocating movement towards the conveying belt by means of the driving mechanism; part of transverse fibers of the paper pulp on the surface of the conveying belt are pressed by the needling assemblies to change the direction and are staggered longitudinally and transversely with other transverse fibers of the paper pulp. By additionally arranging the interweaving device, part of the transverse fibers in the horizontal direction are pressed through the pricking needle assembly of the interweaving device, the transverse fibers are changed in direction to form the longitudinal fibers in the vertical direction or inclined, the longitudinal fibers and the transverse fibers are interwoven, and therefore the peeling strength of the body paper is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel paperboard, and in particular relates to a production line and process of vulcanized fiber base paper for electrical insulation with high peeling strength. Background Art

[0002] Vulcanized fiber base paper is made by soaking and modifying cellulose fibers in pulp in zinc chloride solution. It has the characteristics of hard paper, high dielectric strength and elasticity, good wear resistance, good heat resistance and good insulation. Therefore, vulcanized fiber base paper is widely used in the electrical field as an insulating material with good performance.

[0003] The production line for vulcanized fiber base paper generally includes a crushing device, a cooking device, a pulp washing device, a water filtering device, a drying device and a forming device. During production, the logs are first peeled, crushed and boiled, and the fibers in the logs are separated, washed, purified and toned to form pulp. The pulp is then filtered, dried and formed into vulcanized fiber base paper.

[0004] Although the current vulcanized fiber base paper has sufficient insulation properties, its peel strength is relatively low. During the production process of traditional base paper, the pulp passes through multiple sets of rollers when passing through the water filtering device, drying device and forming device. The rollers only provide force to the pulp along the forward direction of the pulp. This causes most of the fibers that make up the pulp to be oriented horizontally and form transverse fibers after multiple extrusions and guides. The connectivity between the upper and lower layers of the transverse fibers of the pulp is poor, resulting in poor peel strength of the formed base paper.

[0005] When the thickness of the vulcanized fiber paper increases, delamination is very likely to occur between the layers of the vulcanized fiber paper, especially between the layers at the bending parts. Therefore, when used for electrical insulation, the vulcanized fiber paper often becomes thinner in some areas due to delamination, causing rupture in the area and the risk of leakage. Summary of the invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a production line and process for vulcanized fiber base paper for electrical insulation with high peeling strength, by adding an interweaving device, and using the needle assembly of the interweaving device to press part of the transverse fibers along the horizontal direction, so that the transverse fibers change direction to form longitudinal fibers along the vertical direction or inclined direction, and the longitudinal fibers pass through the upper and lower layers of transverse fibers in the vertical or inclined direction and are interwoven with the transverse fibers, thereby improving the peeling strength of the base paper.

[0007] The specific technical solution adopted by the present invention is:

[0008] A production line for vulcanized fiber base paper for electrical insulation with high peeling strength, comprising a frame and a crushing device, a cooking device, a pulp washing device, a water filtering device, a drying device and a forming device located on the frame, wherein the output end of the crushing device is connected to the input end of the cooking device, and the output end of the cooking device is connected to the input end of the pulp washing device. The production line also comprises a conveyor belt, wherein the input end of the conveyor belt is connected to the output end of the pulp washing device, and the output end of the conveyor belt passes through the drying device and is connected to the forming device. An interweaving device is also arranged between the water filtering device and the drying device, wherein the interweaving device comprises a driving mechanism and a needle-piercing assembly, wherein the needle-piercing assembly has a movement amount for reciprocating up and down toward the conveyor belt by means of the driving mechanism, and part of the transverse fibers of the pulp on the surface of the conveyor belt change direction by means of the pressing of the needle-piercing assembly and form a staggered vertical and horizontal pattern with other transverse fibers of the pulp.

[0009] The needle-piercing assembly includes a needle plate and a pad plate, which are symmetrically arranged on the upper and lower sides of the pulp. The surface of the needle plate facing the pulp is provided with interweaving needles in a rectangular array, and the surface of the pad plate facing the pulp is provided with pad holes matching the interweaving needles. The interweaving needles pass through the pulp with the help of a driving mechanism and form a plug-in fit with the pad holes.

[0010] The driving mechanism includes a first eccentric wheel and a second eccentric wheel arranged in parallel along a horizontal plane, the first eccentric wheel and the second eccentric wheel are driven to rotate by means of a first motor and a second motor respectively, the first eccentric wheel and the second eccentric wheel are symmetrically arranged in two groups along the pulp conveying direction, an eccentrically arranged first connecting rod is connected between the two groups of first eccentric wheels, and an eccentrically arranged second connecting rod is connected between the two groups of second eccentric wheels, and a side of the needle plate facing away from the pulp and a side of the pad facing away from the pulp are respectively provided with limiting plates for the first connecting rod and the second connecting rod to pass through, the driving mechanism is mirrored in the horizontal plane where the pulp is located, and the driving mechanisms on both sides are respectively connected to the back side of the needle plate and the back side of the pad.

[0011] The first eccentric wheel and the second eccentric wheel corresponding to the needle plate rotate synchronously, and the first eccentric wheel and the second eccentric wheel corresponding to the pad plate rotate synchronously. The first eccentric wheel of the needle plate and the first eccentric wheel of the pad plate rotate in opposite directions, and the needle plate and the pad are moved closer or farther away by means of their respective driving mechanisms.

[0012] The interweaving needle is provided with friction strips, and a plurality of friction strips are arranged at intervals along the needle body of the interweaving needle. The friction strips are provided with barbs facing the needle body of the interweaving needle. The interweaving needle hooks the transverse fibers of the pulp with the barbs on the surface of the friction strips and drives the transverse fibers to tilt.

[0013] The friction strip is made of wool or nylon, and the barbs are scales on the surface of the wool or nylon.

[0014] A smoothing device is also provided between the interweaving device and the drying device, and the smoothing device includes a first guide roller and a second guide roller arranged in an "eight" shape, the axial direction of the first guide roller forms an angle of 30-60° with the conveying direction of the pulp, and the axial direction of the second guide roller forms an angle of 120-150° with the conveying direction of the pulp, and the pinholes on the surface of the pulp are smoothed by means of the first guide roller and the second guide roller.

[0015] The process specifically includes the following steps:

[0016] S1. Put the logs into a crushing device for peeling, then crush the peeled logs and put them into a cooking device, add mica and stir evenly, and separate the fibers after boiling;

[0017] S2, the fiber enters the pulp washing device for washing, and then uses the filter screen to filter out water and purify it to form pulp, which falls onto the conveyor belt and enters the water filtering device;

[0018] S3, the conveyor belt at the water filter device is a mesh conveyor belt, the water in the pulp seeps out along the mesh holes of the mesh conveyor belt, and then part of the water is squeezed out by the squeezing rollers of the water filter device to obtain pre-dehydrated pulp;

[0019] S4, the pre-dehydrated pulp passes through an interweaving device, and the needle assembly of the interweaving device presses part of the transverse fibers of the pre-dehydrated pulp, so that the transverse fibers change direction and become inclined in the vertical direction;

[0020] S5, the curled pulp passes through a smoothing device, which smoothes the long groove-shaped pinholes generated on the surface of the pulp during the interweaving process and forms pulp with high peeling strength;

[0021] S6. The high peel strength pulp is dried and formed by passing through a drying device and a forming device at one time to obtain a vulcanized fiber base paper for electrical insulation with high peel strength.

[0022] In step S2, the pulp is soaked in a zinc chloride solution for 5-10 seconds to form vulcanized fiber pulp, and the vulcanized fiber pulp falls onto a conveyor belt and enters a water filter.

[0023] The beneficial effects of the present invention are:

[0024] The present invention further provides an interweaving device, which utilizes a needle assembly to press part of the horizontal transverse fibers so that the transverse fibers change direction to form vertical or inclined longitudinal fibers. The longitudinal fibers pass through multiple layers of transverse fibers in the vertical or inclined direction and are interwoven with the transverse fibers, thereby improving the peeling strength of the base paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a process flow chart of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the interweaving device;

[0028] Figure 4 is a top view of the interweaving device;

[0029] Figure 5 It is a top view of the smoothing device;

[0030] Figure 6 is a schematic diagram of the structure of an interlacing needle;

[0031] Figure 7 for Figure 6 A magnified schematic diagram of part A;

[0032] In the accompanying drawings, 1, frame, 2, conveyor belt, 3, needle plate, 4, pad, 5, interweaving needle, 6, pad hole, 7, first eccentric wheel, 8, second eccentric wheel, 9, first motor, 10, second motor, 11, first connecting rod, 12, second connecting rod, 13, friction strip, 14, barb, 15, first guide roller, 16, second guide roller, 17, extrusion roller, 18, drainage trough. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0034] Specific embodiments, such as Figure 1-7 As shown, the present invention provides a production line of vulcanized fiber base paper for electrical insulation with high peel strength, comprising a frame 1 and a crushing device, a cooking device, a pulp washing device, a water filtering device, a drying device and a forming device located on the frame 1, wherein the output end of the crushing device is connected to the input end of the cooking device, and the output end of the cooking device is connected to the input end of the pulp washing device. The production line also includes a conveyor belt 2, wherein the input end of the conveyor belt 2 is connected to the output end of the pulp washing device, and the output end of the conveyor belt 2 passes through the drying device and is connected to the forming device. It is characterized in that an interweaving device is further arranged between the water filtering device and the drying device, wherein the interweaving device comprises a driving mechanism and a needle-piercing assembly, wherein the needle-piercing assembly has the freedom to stretch upward and downward toward the conveyor belt 2 by means of the driving mechanism, and part of the transverse fibers of the pulp on the surface of the conveyor belt 2 change direction by means of the pressing of the needle-piercing assembly and form an interlaced vertical and horizontal pattern with other transverse fibers of the pulp.

[0035] Although the current vulcanized fiber base paper has sufficient insulation, its peel strength is low. In the production process of traditional base paper, the pulp passes through multiple sets of rollers when passing through the water filtering device, the drying device and the forming device. The rollers only provide the pulp with a force along the forward direction of the pulp. This causes most of the fibers that make up the pulp to be oriented in the horizontal direction and form transverse fibers after multiple extrusions and guides. The connectivity between the upper and lower layers of the transverse fibers of the pulp is poor, resulting in poor peel strength of the formed base paper. When the thickness of the vulcanized fiber base paper increases, it is very easy to delaminate between the layers of the vulcanized fiber base paper, especially between the layers at the bending parts. Therefore, when used for electrical insulation, some areas of the vulcanized fiber base paper often become thinner due to delamination, resulting in rupture in the area and the risk of leakage.

[0036] Therefore, an interweaving device is provided in the present invention, which uses a needle assembly to press part of the horizontal transverse fibers, so that the transverse fibers change direction to form vertical or inclined longitudinal fibers. The longitudinal fibers pass through the upper and lower layers of transverse fibers in the vertical or inclined direction and are interwoven with the transverse fibers, thereby improving the peeling strength of the base paper.

[0037] like Figure 2-4 As shown, the needle assembly includes a needle plate 3 and a pad 4, which are symmetrically arranged on the upper and lower sides of the pulp. The surface of the needle plate 3 facing the pulp is provided with interlacing needles 5 in a rectangular array, and the surface of the pad 4 facing the pulp is provided with pad holes 6 matching the interlacing needles 5. The interlacing needles 5 pass through the pulp with the help of a driving mechanism and form a plug-in fit with the pad holes 6. When the interlacing needles 5 press the transverse fibers downward, the cooperation between the needle plate 3 and the pad 4 limits the transverse fibers, preventing the transverse fibers from sliding away from the two sides of the needle tip of the interlacing needle 5, and ensuring that the transverse fibers in this area change direction or form deformation under the interaction between the interlacing needles 5 and the pad holes 6. In addition, the needle plate 3 and the pad 4 jointly clamp and squeeze the pulp, which also forms a secondary squeeze on the pulp, filtering out part of the water in the pulp, which is conducive to the shaping of the transverse fibers after the direction is changed.

[0038] like Figure 2-4As shown, the driving mechanism includes a first eccentric wheel 7 and a second eccentric wheel 8 arranged in parallel along a horizontal plane, the first eccentric wheel 7 and the second eccentric wheel 8 are driven to rotate by means of a first motor 9 and a second motor 10 respectively, and the first eccentric wheel 7 and the second eccentric wheel 8 are symmetrically arranged in two groups along the pulp conveying direction, an eccentrically arranged first connecting rod 11 is connected between the two groups of first eccentric wheels 7, and an eccentrically arranged second connecting rod 12 is connected between the two groups of second eccentric wheels 8, and the side of the needle plate 3 facing away from the pulp and the side of the pad 4 facing away from the pulp are respectively provided with limiting plates for the first connecting rod 11 and the second connecting rod 12 to pass through, and the driving mechanism is arranged in a mirror image of the horizontal plane where the pulp is located, and the driving mechanisms on both sides are respectively connected to the back side of the needle plate 3 and the back side of the pad 4. In the present invention, an eccentric wheel is used to drive the swing of the needle assembly. Since the pulp is always in a forward state, and the first eccentric wheel 7 and the second eccentric wheel 8 not only provide the needle plate 3 and the pad plate 4 with a vertical movement amount, but also provide a horizontal movement amount. Therefore, when the interweaving needle 5 interweaves the pulp fibers, in addition to pressing the transverse fibers downward, it also moves forward with the movement of the pulp, thereby preventing the interweaving needle 5 from hindering the movement of the pulp.

[0039] The eccentric wheel on one side of the driving structure is hinged to the frame 1 and has the freedom of rotation, the eccentric wheel on the other side of the driving structure is hinged to the driving end of the motor, and the fixed end of the motor is fixedly connected to the frame 1.

[0040] like Figure 2-4 As shown, the first eccentric wheel 7 and the second eccentric wheel 8 corresponding to the needle plate 3 rotate synchronously, and the first eccentric wheel 7 and the second eccentric wheel 8 corresponding to the pad 4 rotate synchronously. The first eccentric wheel 7 of the needle plate 3 and the first eccentric wheel 7 of the pad 4 rotate in opposite directions. The needle plate 3 and the pad are formed to approach or move away with the help of their respective driving mechanisms. By making the eccentric wheels of the two sets of driving mechanisms rotate in opposite directions, the needle plate 3 and the pad 4 form a cycle of alternating approach and distance. In addition, the displacement speed of the needle plate 3 and the pad 4 in the horizontal direction is slightly greater than the forward speed of the pulp. Therefore, the interweaving needle 5 and the pulp will produce relative movement. The relative movement of the interweaving needle 5 and the pulp will make the fibers that should be in the vertical direction inclined. The inclined fibers can pass through more transverse fibers and form connections, thereby better improving the peeling strength of the base paper.

[0041] In addition, two groups of interweaving devices are arranged along the advancing direction of the pulp in the present invention. Since the driving mechanism in the present invention adopts an eccentric wheel, an idle period is generated in the process of the needle assembly being lifted up and separated from the pulp to being close to the pulp again and inserted into the pulp. Therefore, two groups of interweaving devices are arranged. The second group of interweaving devices just interweaves the idle period on the pulp to ensure that the pulp can be interwoven at all places along the length direction.

[0042] like Figure 6-7As shown, the interweaving needle 5 is provided with a friction strip 13, and a plurality of groups of the friction strips 13 are arranged at intervals along the needle body direction of the interweaving needle 5. The friction strip 13 is provided with barbs 14 facing the needle body of the interweaving needle 5. The interweaving needle 5 hooks the transverse fibers of the pulp with the barbs 14 on the surface of the friction strip 13 and drives the transverse fibers to tilt. The friction strip 13 is made of wool or nylon, and the barbs 14 are scales on the surface of the wool or nylon. Since the fibers constituting the pulp are thin and short in diameter, the length of the fibers is generally about 2 mm and the diameter is about 30 μm. It is difficult for ordinary needles to contact the fibers and carry the fibers to change the direction of the fibers. Therefore, the interweaving needle 5 in the present invention is provided with a friction strip 13 composed of wool fibers or nylon. The surface of the wool fiber or the surface of the nylon is covered with scales and forms barbs 14. The free end of the barb 14 faces the interweaving needle 5. When the interweaving needle 5 presses the transverse fibers downward, the friction strip 13 will be in an inclined state. At this time, the free end of the barb 14 of the friction strip 13 will face downward, so the barb 14 will hook more transverse fiber ends and drive them to move downward, thereby changing the direction of the transverse fibers. When the interweaving needle 5 retreats, the direction of the friction strip 13 and the barb 14 changes, so the barb 14 will still hook the transverse fiber end and drive it to move upward, so that the transverse fibers form "U"-shaped longitudinal fibers, increase the combination between the longitudinal fibers and the multiple layers of transverse fibers, and improve the peeling strength of the formed base paper.

[0043] like Figure 2 and Figure 5 As shown, a smoothing device is further provided between the interweaving device and the drying device, and the smoothing device comprises a first guide roller 15 and a second guide roller 16 arranged in an "eight" shape, the axis direction of the first guide roller 15 forms an angle of 30-60° with the conveying direction of the pulp, and the axis direction of the second guide roller 16 forms an angle of 120-150° with the conveying direction of the pulp. The pinholes on the surface of the pulp are smoothed by means of the first guide roller 15 and the second guide roller 16. Due to the relative movement of the interweaving needle 5 and the pulp, long groove-shaped pinholes are formed on the surface of the pulp, as shown in FIG. Figure 5 As described by the dotted line in the figure, if subsequent drying and forming are carried out directly, defects will appear in the area of ​​the base paper located at the long groove, affecting the performance of the base paper. Therefore, a smoothing device is provided. First, it passes through a first guide roller 15 inclined to the left. The first guide roller 15 will twist the surface of the pulp to the right and fill the defective area of ​​the long groove. Then, it passes through a second guide roller 16 inclined to the right. The second guide roller 16 will twist the surface of the pulp to the left and reset it, thereby filling the defective area of ​​the long groove of the pulp while ensuring that the overall structure of the pulp is not changed.

[0044] like Figure 2 As shown, a drainage groove 18 is provided at the bottom of the frame 1, and the water flowing out during the filtering, interweaving and drying processes is collected and discharged through the drainage groove 18.

[0045] The present invention also provides a process for producing a production line of vulcanized fiber base paper for electrical insulation with high peel strength, such as Figure 1 As shown, the process specifically includes the following steps:

[0046] S1. Put the logs into a crushing device for peeling, then crush the peeled logs and put them into a cooking device, add mica and stir evenly, and separate the fibers after boiling;

[0047] S2, the fiber enters the pulp washing device for washing, and then uses the filter screen to filter out water and purify to form pulp, and the pulp falls onto the conveyor belt 2 and enters the water filtering device;

[0048] S3, the conveyor belt 2 at the water filtering device is a mesh conveyor belt 2, water in the pulp seeps out along the mesh holes of the mesh conveyor belt 2, and then a part of the water is squeezed out by means of the squeezing rollers 17 of the water filtering device to obtain pre-dehydrated pulp;

[0049] S4, the pre-dehydrated pulp passes through an interlacing device, and the needle assembly of the interlacing device presses part of the transverse fibers of the pre-dehydrated pulp, so that the transverse fibers change direction and become inclined in the vertical direction, and the pulp surface forms an oblong groove due to the relative movement of the needle assembly and the pulp;

[0050] S5, the curled pulp is smoothed by a smoothing device to smooth the long circular grooves and form a pulp with high peeling strength;

[0051] S6. The high peel strength pulp is dried and formed by passing through a drying device and a forming device at one time to obtain a vulcanized fiber base paper for electrical insulation with high peel strength.

[0052] In step S2, the pulp is soaked in zinc chloride solution for 5-10 seconds to form vulcanized fiber pulp, and the vulcanized fiber pulp falls onto the conveyor belt 2 and enters the water filtering device.

[0053] The pulp in the present invention needs to be soaked in a zinc chloride solution for several seconds before filtering to modify the cellulose fibers of the pulp into vulcanized fibers, thereby improving the strength and insulation capacity of the base paper. Secondly, the present invention uses an interweaving device to change the direction of some horizontal transverse fibers in the pulp to form vertical or inclined longitudinal fibers. The longitudinal fibers pass through multiple layers of transverse fibers in the vertical or inclined direction and are interwoven with the transverse fibers, thereby improving the peeling strength of the base paper.

[0054] The squeezing rollers 17 of the water filtering device are arranged up and down, and squeeze the pulp once to squeeze out most of the water in the pulp, so that the pulp is in a wet state with a certain toughness and strength, which is beneficial to the shaping of the fibers after changing direction in the subsequent interweaving process.

Claims

1. A production line of vulcanized fiber base paper for electrical insulation with high peel strength, comprising a frame (1) and a crushing device, a cooking device, a pulp washing device, a water filtering device, a drying device and a forming device located on the frame (1), wherein the output end of the crushing device is connected to the input end of the cooking device, and the output end of the cooking device is connected to the input end of the pulp washing device. The production line also comprises a conveyor belt (2), the input end of the conveyor belt (2) is connected to the output end of the pulp washing device, and the output end of the conveyor belt (2) passes through the drying device and is connected to the forming device, characterized in that: An interlacing device is also provided between the water filtering device and the drying device, the interlacing device comprising a driving mechanism and a needle assembly, the needle assembly having a movement amount to move up and down toward the conveyor belt (2) by means of the driving mechanism, and part of the transverse fibers of the pulp on the surface of the conveyor belt (2) change direction by means of the pressure of the needle assembly and form an interlaced vertical and horizontal pattern with other transverse fibers of the pulp.

2. The production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 1, characterized in that: The needle-piercing assembly comprises a needle plate (3) and a pad plate (4), wherein the needle plate (3) and the pad plate (4) are symmetrically arranged on the upper and lower sides of the pulp, and the surface of the needle plate (3) facing the pulp is provided with interlacing needles (5) in a rectangular array, and the surface of the pad plate (4) facing the pulp is provided with pad holes (6) matching the interlacing needles (5), and the interlacing needles (5) pass through the pulp with the help of a driving mechanism and form a plug-in fit with the pad holes (6).

3. The production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 2, characterized in that: The driving mechanism comprises a first eccentric wheel (7) and a second eccentric wheel (8) which are arranged in parallel along a horizontal plane. The first eccentric wheel (7) and the second eccentric wheel (8) are driven to rotate by means of a first motor (9) and a second motor (10) respectively. Two groups of the first eccentric wheel (7) and the second eccentric wheel (8) are symmetrically arranged along the pulp conveying direction. An eccentrically arranged first connecting rod (11) is connected between the two groups of first eccentric wheels (7). An eccentrically arranged second connecting rod (12) is connected between the two groups of second eccentric wheels (8). A side of the needle plate (3) facing away from the pulp and a side of the pad (4) facing away from the pulp are respectively provided with limiting plates for the first connecting rod (11) and the second connecting rod (12) to pass through. The driving mechanism is arranged in a mirror image with respect to the horizontal plane where the pulp is located. The driving mechanisms on both sides are respectively connected to the back side of the needle plate (3) and the back side of the pad (4).

4. The production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 3, characterized in that: The first eccentric wheel (7) and the second eccentric wheel (8) corresponding to the needle plate (3) rotate synchronously, and the first eccentric wheel (7) and the second eccentric wheel (8) corresponding to the pad (4) rotate synchronously. The first eccentric wheel (7) of the needle plate (3) and the first eccentric wheel (7) of the pad (4) rotate in opposite directions. The needle plate (3) and the pad are moved closer or farther away by means of their respective driving mechanisms.

5. The production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 2, characterized in that: The interlacing needle (5) is provided with a friction strip (13), and a plurality of groups of the friction strips (13) are arranged at intervals along the needle body direction of the interlacing needle (5). The friction strips (13) are provided with barbs (14) directed toward the needle body of the interlacing needle. The interlacing needle (5) hooks the transverse fibers of the pulp with the help of the barbs (14) on the surface of the friction strips (13) and drives the transverse fibers to tilt.

6. The production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 5, characterized in that: The friction strip (13) is made of wool or nylon, and the barbs (14) are scales on the surface of the wool or nylon.

7. The production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 1, characterized in that: A smoothing device is also provided between the interlacing device and the drying device, the smoothing device comprising a first guide roller (15) and a second guide roller (16) arranged in an "eight" shape, the axial direction of the first guide roller (15) and the conveying direction of the pulp forming an angle of 30-60°, the axial direction of the second guide roller (16) and the conveying direction of the pulp forming an angle of 120-150°, the pinholes on the surface of the pulp are smoothed by means of the first guide roller (15) and the second guide roller (16).

8. A process for producing a production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 7, characterized in that: The process specifically includes the following steps: S1. Put the logs into a crushing device for peeling, then crush the peeled logs and put them into a cooking device, add mica and stir evenly, and separate the fibers after boiling; S2, the fibers enter the pulp washing device for washing, and then use the filter screen to filter out water and purify to form pulp, and the pulp falls onto the conveyor belt (2) and enters the water filtering device; S3, the conveyor belt (2) at the water filtering device is a mesh conveyor belt (2), water in the pulp seeps out along the mesh holes of the mesh conveyor belt (2), and then a part of the water is squeezed out by means of the squeezing rollers (17) of the water filtering device to obtain pre-dehydrated pulp; S4, the pre-dehydrated pulp passes through an interweaving device, and the needle assembly of the interweaving device presses part of the transverse fibers of the pre-dehydrated pulp, so that the transverse fibers change direction and become inclined in the vertical direction; S5, the curled pulp passes through a smoothing device, which smoothes the long groove-shaped pinholes generated on the surface of the pulp during the interweaving process and forms pulp with high peeling strength; S6. The high peel strength pulp is dried and formed by passing through a drying device and a forming device at one time to obtain a vulcanized fiber base paper for electrical insulation with high peel strength.

9. The process of a production line of vulcanized fiber base paper for electrical insulation with high peel strength according to claim 8, characterized in that: In step S2, the pulp is soaked in a zinc chloride solution for 5-10 seconds to form vulcanized fiber pulp, and the vulcanized fiber pulp falls onto a conveyor belt (2) and enters a water filtering device.

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