Preparation process and equipment of sanitary towel hot melt adhesive

Abstract

The invention relates to the technical field of hot melt adhesives, in particular to a preparation process and equipment of a sanitary towel hot melt adhesive. The liquid adding pipe and the air pipe are installed at the top of the auxiliary kettle body, the three-way valve I is located between the main kettle body and the auxiliary kettle body, the heaters are installed on the main kettle body and the auxiliary kettle body, the air brake bin is installed on the main kettle body, the feeding hopper is installed at the input end of the air brake bin, and the three-way valve II is installed at the output end of the air brake bin. The output end of the air brake bin extends into the reaction chamber of the main kettle body, the second three-way valve is located on the main kettle body, a first channel of the second three-way valve is communicated with the air brake bin, a second channel of the second three-way valve is communicated with the reaction chamber of the main kettle body, a third channel of the second three-way valve is connected with the vacuum pump, and a stirring mechanism is installed in the reaction chamber of the main kettle body; the auxiliary kettle body is used for carrying out pretreatment work and multi-wave feeding on liquid raw materials, so that the waiting time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, and in particular to a preparation process and equipment for hot melt adhesives for sanitary napkins. Background Art

[0002] Hot melt adhesive for sanitary napkins is generally called sanitary napkin hot melt adhesive. The physical state of the hot melt adhesive changes with the temperature within a certain temperature range, while the chemical properties remain unchanged. It is non-toxic and tasteless, and is an environmentally friendly chemical product. In the prior art, a variety of preparation processes and methods for sanitary napkin hot melt adhesives have been proposed. For example, the Chinese invention patent with publication number CN111978897B proposes a defluorescent pressure-sensitive hot melt adhesive for breathable film back adhesive of sanitary napkins and a preparation method thereof. The method can effectively improve the cohesive strength and heat resistance of the pressure-sensitive hot melt adhesive through the synergistic effect of compounding thermoplastic elastomer, first petroleum resin, second petroleum resin, etc. with tackifying resin, etc., and solves the problem of poor and good bonding strength of breathable film back adhesive in sanitary napkin hot melt adhesive. Another example is a hot-melt pressure-sensitive adhesive for sanitary napkins and a production method thereof proposed in a Chinese invention application with publication number CN108276940A. The method comprises the following steps: heating a reaction container, adding a softener and raising the temperature, adding a tackifying resin and maintaining the temperature until the tackifying resin is completely melted, adding a thermoplastic elastomer to start the reaction, adding a remaining tackifying resin and an antioxidant, adding polyisobutylene, discharging the material after the reaction is completed, filtering, cooling and packaging; the prepared sanitary napkin is easy to peel off and not easy to transfer, thereby reducing the residual amount of the sanitary napkin on clothing.

[0003] The above-mentioned prior arts all propose to use a reactor as the main preparation equipment, but the specific structure of the reactor is not described. The above-mentioned prior arts all require adding liquid and solid raw materials into the reactor in batches, and the traditional reactor generally has only one reactor body, and in order to ensure its sealing, the connection method between the reactor body and the reactor cover is relatively complicated. Therefore, when using a traditional reactor to prepare sanitary napkin melt, the operation of adding materials midway is relatively troublesome. The design of a single reactor body will waste a lot of static waiting time, resulting in low work efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a preparation process and equipment for sanitary napkin hot melt adhesive, which reduces waiting time and improves work efficiency by performing preparatory treatment of liquid raw materials and adding materials in waves in an auxiliary kettle.

[0005] The invention discloses a preparation device for hot melt adhesive for sanitary napkins, comprising a main kettle body, a reaction chamber arranged inside the main kettle body; an auxiliary kettle body, a liquid adding pipe, an air pipe, a three-way valve 1, a feeding hopper, an air lock chamber and a three-way valve 2, a preparatory chamber arranged inside the auxiliary kettle body, a liquid adding pipe and an air pipe installed on the top of the auxiliary kettle body, the liquid adding pipe and the air pipe are both connected to the preparatory chamber of the auxiliary kettle body, the three-way valve 1 is located between the main kettle body and the auxiliary kettle body, the first channel of the three-way valve 1 is connected to the reaction chamber of the main kettle body, and the second channel of the three-way valve 1 is connected to the reaction chamber of the main kettle body. It is connected to the preparatory chamber of the auxiliary kettle body, the third channel of the three-way valve one is provided with a discharge pipe, heaters are installed on both the main kettle body and the auxiliary kettle body, the airlock is installed on the main kettle body, the input end of the airlock is equipped with a hopper, and the output end of the airlock extends into the reaction chamber of the main kettle body, the three-way valve two is located on the main kettle body, the first channel of the three-way valve two is connected to the airlock, the second channel of the three-way valve two is connected to the reaction chamber of the main kettle body, the third channel of the three-way valve two is connected to the vacuum pump, and a stirring mechanism is installed in the reaction chamber of the main kettle body;During operation, the heaters on the main kettle body and the auxiliary kettle body preheat the main kettle body and the auxiliary kettle body to a specified temperature, and a liquid softener is directly added to the reaction chamber of the main kettle body through the feeding hopper and the airlock. The heater of the main kettle body heats the softener to a specified temperature and leaves it to stand for a period of time. During this process, all the measured tackifying resin is added to the preparatory chamber of the auxiliary kettle body through the liquid adding pipe. The heater of the auxiliary kettle body heats the tackifying resin to a specified temperature and leaves it to stand for a period of time. The three-way valve 1 connects the first channel with the second channel, and inputs high-pressure gas to the top of the preparatory chamber of the auxiliary kettle body through the air pipe. At the same time, the three-way valve 2 connects the second channel with the third channel. The three-way valve 1 is connected to the auxiliary kettle body, and the vacuum pump is turned on to extract the gas from the upper part of the reaction chamber of the main kettle body, so that the tackifying resin in the preparatory chamber of the auxiliary kettle body is input into the reaction chamber of the main kettle body through the three-way valve 1. When the tackifying resin reaches the specified delivery amount, the three-way valve 1 closes all the channels, and the three-way valve 2 keeps the vacuum state to keep the negative pressure in the reaction chamber of the main kettle body. The stirring mechanism in the reaction chamber of the main kettle body stirs and mixes the tackifying resin and the softener until the tackifying resin is completely melted. All the thermoplastic elastomer is added to the airlock through the feeding hopper, and the input end of the airlock is closed. The second channel of the three-way valve 2 is connected to the third channel to extract the air inside the airlock. The second channel of the rear three-way valve 2 is closed, the output end of the airlock is opened, the thermoplastic elastomer is added to the mixed liquid of the tackifying resin and the softener in waves for reaction, the heater of the main kettle body is turned on to maintain the temperature of the mixed liquid, the antioxidant is added to the preparatory chamber of the auxiliary kettle body through the liquid adding pipe, the three-way valve 1 connects the first channel and the second channel, the air pipe inputs high-pressure gas into the preparatory chamber of the auxiliary kettle body, the remaining tackifying resin and all the antioxidant are input into the reaction chamber of the main kettle body to participate in the reaction, polyisobutylene is input into the preparatory chamber of the auxiliary kettle body through the liquid adding pipe, the three-way valve 1 connects the first channel and the second channel, the air pipe inputs high-pressure gas into the preparatory chamber of the auxiliary kettle body High-pressure gas is input into the preparation chamber, and all polyisobutylene is input into the reaction chamber of the main kettle body to participate in the reaction. After thorough reaction, liquid hot melt adhesive is obtained. The three-way valve 1 connects the first channel with the liquid adding pipe channel, so that the liquid hot melt adhesive is discharged through the discharge pipe of the three-way valve 1 and solid hot melt adhesive is obtained after cooling. Compared with the prior art, an auxiliary kettle body is added, and the preparatory treatment of liquid raw materials is carried out in the auxiliary kettle body, which reduces the waiting time. In addition, liquid raw materials are added to the main kettle body in waves through the auxiliary kettle body, and there is no need for complicated opening and closing operations, which improves work efficiency, and also cancels the sealing structure of the main kettle body, which simplifies the structure and has good practicality. ;

[0006] Preferably, it also includes a vibration rod and multiple support rods, the vibration rod is installed in the preparatory chamber of the auxiliary kettle body, and multiple support rods are installed on the vibration rod; when the raw materials used in the main kettle body react to obtain liquid hot melt adhesive, the hot melt adhesive is input into the preparatory chamber of the auxiliary kettle body through the three-way valve one, the vibration rod is opened to drive the multiple support rods to vibrate, and the bubbles in the hot melt adhesive are vibrated out to the upper part of the preparatory chamber of the auxiliary kettle body, the air pipe is connected to the vacuum pump to extract the gas, and after the bubbles in the hot melt adhesive are exhausted, the three-way valve one connects the second channel with the three channels of the liquid adding pipe, so that the hot melt adhesive in the preparatory chamber of the auxiliary kettle body is discharged through the discharge pipe of the three-way valve one, thereby reducing the bubbles in the hot melt adhesive and improving the quality of the hot melt adhesive.

[0007] Preferably, the stirring mechanism includes a motor, a stirring shaft, multiple stirring blades and multiple guide holes. The motor is installed on the main kettle body, and the output shaft of the motor is drivingly connected to the stirring shaft. The stirring shaft is rotatably installed in the reaction chamber of the main kettle body. The multiple stirring blades are evenly installed on the stirring shaft along the circumferential direction, and the multiple stirring blades are all provided with guide holes; the motor drives the stirring shaft to rotate, and the stirring shaft drives the multiple stirring blades to rotate to stir and mix the reaction raw materials. By providing multiple guide holes, the flow of raw materials is made more complicated, thereby improving the raw material mixing efficiency.

[0008] Preferably, it also includes an auger tube and auger blades, multiple stirring blades are connected to the bottom of the stirring shaft, the auger tube is installed inside the reaction chamber of the main kettle body through a bracket, the auger tube is sleeved on the outside of the stirring shaft, an outlet is arranged at the lower end of the auger tube, an inlet is arranged at the upper part of the auger tube, the auger blades are installed on the outer wall of the stirring shaft, and the auger blades are located inside the auger tube; when the stirring shaft drives the multiple stirring blades to stir the reaction raw materials, the reaction raw materials located at the bottom of the reaction chamber of the main kettle body flow to the outside of the auger tube under the action of centrifugal force, thereby reducing the pressure at the bottom outlet of the auger tube, and then reducing the internal pressure of the auger tube, and the reaction raw materials located at the upper part of the reaction chamber of the main kettle body are sucked into the auger tube through the inlet, and the auger blades rotate driven by the stirring shaft, so that the auger blades push the raw materials in the auger tube downward and push them out through the outlet of the auger tube, thereby realizing the circulation of the reaction raw materials and improving the stirring efficiency.

[0009] Preferably, the airlock comprises an exhaust box, an upper valve, a feeding pipe, a gate plate and an exhaust pipe, the exhaust box is mounted on the main kettle body, a cavity is arranged inside the exhaust box, the cavity of the exhaust box is connected with the first channel of the three-way valve 2 through the exhaust pipe, an opening connected with the cavity is arranged on the upper end face of the exhaust box, a feeding hopper is mounted on the opening of the exhaust box, an upper valve is mounted on the lower end of the feeding hopper, a discharge port is arranged on the lower end face of the exhaust box, the discharge port is connected with the cavity of the exhaust box, the feeding pipe is mounted at the lower part of the discharge port of the exhaust box, the lower end of the feeding pipe extends into the reaction chamber of the main kettle body, and the gate plate is rotatably mounted in the feeding pipe. , the gate is driven by a servo motor; when it is necessary to add materials to the reaction chamber of the main kettle body, open the upper valve, add solid raw materials into the cavity of the vacuum box through the feeding hopper, close the upper valve, and connect the first channel with the third channel by three-way valve 2, and extract the gas in the cavity of the vacuum box through the vacuum pipe and three-way valve 2. The three-way valve 2 closes the first channel, and the servo motor drives the gate to rotate to open the feeding pipe, so that the solid raw materials in the cavity of the vacuum box are added to the reaction chamber of the main kettle body through the feeding pipe, avoiding pollution caused by the entry of outside air during the feeding process and improving product quality.

[0010] Preferably, it also includes a distribution box and a distribution assembly. The distribution box is installed on the upper part of the reaction chamber of the main kettle body. A distribution chamber is arranged inside the distribution box. The top of the distribution chamber is connected with the lower end of the feeding pipe. The lower end surface of the distribution box is provided with a distribution hole connected with the distribution chamber. The distribution box is installed with the distribution assembly. The distribution assembly is linked with the stirring shaft, and the distribution assembly opens the distribution hole intermittently. When adding materials, solid raw materials are added to the distribution box through the feeding pipe. The stirring shaft rotates to drive the distribution assembly to move. When the distribution assembly opens the distribution hole of the distribution box, a part of the solid raw materials are put into the reaction chamber of the main kettle body to avoid agglomerates caused by too much raw material being put in at one time, thereby improving the reaction efficiency.

[0011] Preferably, the material distribution assembly includes a vertical rod, multiple paddles, a circular plate, a gear ring and a gear. The vertical rod is rotatably installed in the material distribution chamber of the material distribution box. The lower end of the vertical rod extends out from the bottom of the material distribution box. Multiple paddles are installed on the vertical rod. The circular plate is installed at the lower end of the vertical rod. The circular plate is located below the material distribution box. The circular plate is provided with one or more through holes matching the material distribution holes of the material distribution box. The outer wall of the circular plate is installed with a gear ring. The gear is installed on the stirring shaft, and the gear is meshed with the gear ring. When the stirring shaft rotates, it drives the gear to rotate, and the gear engages with the gear ring to drive the circular plate to rotate. When the through hole of the circular plate is aligned with the material distribution hole of the material distribution box, the raw materials in the material distribution chamber of the material distribution box are put into the reaction chamber of the main kettle body. At the same time, when the circular plate rotates, it drives the vertical rod and the multiple paddles to rotate, so that the multiple paddles stir the raw materials in the material distribution chamber of the material distribution box to avoid blockage, which has good practicality.

[0012] Preferably, the cloth assembly includes a vertical rod 2, a plurality of levers 2, a baffle, a half gear ring, a spring assembly and a half gear. The vertical rod 2 is rotatably installed in the cloth chamber of the cloth box. The lower end of the vertical rod 2 extends out from the bottom of the cloth box. A plurality of levers 2 are installed on the vertical rod 2. The baffle is installed at the lower end of the vertical rod 2. The baffle is located below the cloth box and blocks the cloth hole of the cloth box. The half gear ring is installed on the edge of the baffle away from the vertical rod 2. One end of the spring assembly is connected to the lower end surface of the cloth box, and the other end of the spring assembly is connected to the baffle. The half gear is installed Installed on the stirring shaft, the half gear is meshed with the half gear ring; when the stirring shaft rotates, it drives the half gear to rotate. When the half gear is meshed with the half gear ring, the baffle is driven to rotate around the vertical rod 2. When the baffle does not block the distribution hole of the distribution box, the raw material is put into the reaction chamber of the main kettle body through the distribution hole. When the half gear is disengaged from the half gear ring, the elastic force of the spring assembly resets the baffle. In this process, the baffle drives the vertical rod 2 to rotate reciprocatingly, and the vertical rod 2 drives multiple levers 2 to stir the raw materials in the distribution chamber of the distribution box to avoid blockage, which has good practicality.

[0013] Preferably, the cloth assembly includes an arc groove, three vertical rods, three levers, a horizontal axis, multiple spokes, a toothed disc, a driven gear, a bevel gear one and a bevel gear two. An inward arc groove is arranged on the lower end surface of the cloth box, and the cloth hole of the cloth box is arranged on the side wall of the arc groove. The vertical rod three is rotatably installed in the cloth chamber of the cloth box, and the lower end of the vertical rod three extends out from the bottom of the cloth box through the arc groove. Multiple levers three are installed on the vertical rod three, and the horizontal axis is rotatably installed in the arc groove through a bracket. The horizontal axis is located below the cloth box, and multiple spokes are evenly installed on the circumference of the side wall of the horizontal axis, and the outer edges of the multiple spokes are in contact with the arc groove. The toothed disc is concentrically installed on the horizontal axis, and the driven gear is concentrically installed on the lower end of the vertical rod three. The toothed disc is meshed, and one bevel gear is installed concentrically on the end of the horizontal shaft. The second bevel gear is installed concentrically on the stirring shaft. The second bevel gear is meshed with the first bevel gear. When the stirring shaft rotates, it drives the second bevel gear to rotate. The second bevel gear meshes with the first bevel gear to drive the horizontal shaft to rotate. The horizontal shaft drives multiple spokes to rotate. When the edge of the spoke contacts the arc groove, the spoke blocks the material distribution opening on the arc groove. When the spoke is separated from the arc groove, the raw material is put into the reaction chamber of the main kettle body through the gap between the arc groove and the spoke. In this process, the horizontal shaft drives the toothed disc to rotate, and the toothed disc meshes with the driven gear to drive the third vertical rod to rotate. The third vertical rod drives multiple levers to mix the raw materials in the material distribution chamber of the material distribution box to avoid blockage, which is practical.

[0014] A preparation process of a sanitary napkin hot melt adhesive of the present invention, using the preparation equipment of the sanitary napkin hot melt adhesive, comprises the following steps: S1. The heaters on the main kettle and the auxiliary kettle preheat the main kettle and the auxiliary kettle to 150-160°C; S2. Aromatic mineral oil is added as a softener to the reaction chamber of the main kettle through the feeding hopper and the airlock. The heater of the main kettle heats the softener to 160-165° C. and leaves it to stand for 10-15 minutes. During this process, a tackifying resin is added to the preparatory chamber of the auxiliary kettle through the liquid adding pipe. The heater of the auxiliary kettle heats the tackifying resin to 160-160° C. and leaves it to stand for 10-15 minutes. S3, the first channel and the second channel of the three-way valve 1 are connected, and high-pressure gas is input to the top of the preparatory chamber of the auxiliary kettle body through the air pipe. At the same time, the second channel of the three-way valve 2 is connected to the third channel, and the vacuum pump is turned on to extract the gas from the upper part of the reaction chamber of the main kettle body, so that 35%-40% of the tackifying resin in the preparatory chamber of the auxiliary kettle body is input into the reaction chamber of the main kettle body through the three-way valve 1. When the tackifying resin reaches the specified delivery amount, the three-way valve 1 closes all channels, and the three-way valve 2 keeps the vacuum state, so that the reaction chamber of the main kettle body maintains a negative pressure, and the stirring mechanism in the reaction chamber of the main kettle body stirs and mixes the tackifying resin and the softener until the tackifying resin is completely melted; S4, adding all the thermoplastic elastomer into the airlock through the feeding hopper, closing the input end of the airlock, connecting the second channel of the three-way valve 2 with the third channel, pumping out the air inside the airlock, closing the second channel of the three-way valve 2, opening the output end of the airlock, adding the thermoplastic elastomer in waves to the mixed solution of the tackifying resin and the softener for reaction, and turning on the heater of the main kettle to maintain the temperature of the mixed solution; S5, adding the antioxidant into the preparatory chamber of the auxiliary kettle through the liquid adding pipe, connecting the first channel and the second channel of the three-way valve 1, inputting high-pressure gas into the preparatory chamber of the auxiliary kettle through the air pipe, and inputting the remaining tackifying resin and all the antioxidant into the reaction chamber of the main kettle to participate in the reaction; S6, polyisobutylene is introduced into the preparatory chamber of the auxiliary kettle through the liquid adding pipe, the first channel and the second channel of the three-way valve 1 are connected, and the gas pipe introduces high-pressure gas into the preparatory chamber of the auxiliary kettle, and all the polyisobutylene is introduced into the reaction chamber of the main kettle to participate in the reaction, and liquid hot melt adhesive is obtained after thorough reaction; S7, the first channel of the three-way valve 1 is connected to the second channel, and high-pressure gas is input into the reaction chamber of the main kettle through the three-way valve 2, and the hot melt adhesive is input into the preparatory chamber of the auxiliary kettle. The vibration rod is turned on to drive the multiple support rods to vibrate, and the bubbles in the hot melt adhesive are vibrated out to the upper part of the preparatory chamber of the auxiliary kettle. The air pipe is connected to the vacuum pump to extract the gas until the bubbles in the hot melt adhesive are exhausted and stop; S8. The second channel of the three-way valve 1 is connected to the third channel, so that the air pipe inputs high-pressure gas into the preparatory chamber of the auxiliary kettle body, so that the liquid hot melt adhesive is discharged through the discharge pipe of the three-way valve 1, and solid hot melt adhesive is obtained after cooling.

[0015] Compared with the prior art, the beneficial effects of the present invention are: an auxiliary kettle body is added, and preparatory processing of liquid raw materials is carried out in the auxiliary kettle body, thereby reducing waiting time, and liquid raw materials are added to the main kettle body in waves through the auxiliary kettle body, without the need for complicated opening and closing operations, thereby improving work efficiency, and also eliminating the sealing structure of the main kettle body, simplifying the structure, and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the axonometric structure of the present invention; Figure 4 It is a schematic diagram of the second structure of the hopper, airlock chamber and three-way valve; Figure 5 It is a structural schematic diagram of the stirring mechanism; Figure 6 is a schematic diagram of the structure of the material distribution box and the material distribution assembly in Example 2; Figure 7 is a schematic structural diagram of the disassembled state of the cloth box and the cloth assembly in Example 2; Figure 8 is a schematic structural diagram of a material distribution box and a material distribution assembly in Example 3; Fig. 9 is a schematic structural diagram of the disassembled state of the cloth box and the cloth assembly in Example 3; Fig.10 is a schematic diagram of the structure of the material distribution box and the material distribution assembly in Example 4; Fig.11 It is a structural schematic diagram of the disassembled state of the cloth box and the cloth assembly in Example 4.

[0017] Markings in the attached drawings: 1, main kettle body; 2, auxiliary kettle body; 3, liquid adding pipe; 4, air pipe; 5, three-way valve 1; 6, feeding hopper; 7, air lock chamber; 8, three-way valve 2; 9, vibration rod; 10, support rod; 11, motor; 12, stirring shaft; 13, stirring blade; 14, auger pipe; 15, auger blade; 16, air extraction box; 17, upper valve; 18, feeding pipe; 19, gate; 20, air extraction pipe; 21, diversion hole; 22. Fabric box; 23. Vertical rod one; 24. Paddle one; 25. Round plate; 26. Ring gear; 27. Gear one; 28. Vertical rod two; 29. ​​Paddle two; 30. Baffle; 31. Half ring gear; 32. Spring assembly; 33. Half gear; 34. Arc groove; 35. Vertical rod three; 36. Paddle three; 37. Horizontal axis; 38. Spoke plate; 39. Toothed disc; 40. Driven gear; 41. Bevel gear one; 42. Bevel gear two. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Example 1

[0019] like Figures 1 to 5As shown, a preparation device for hot melt adhesive for sanitary napkins includes a main kettle body 1, and a reaction chamber is arranged inside the main kettle body 1; it also includes an auxiliary kettle body 2, a liquid adding pipe 3, an air pipe 4, a three-way valve 5, a feeding hopper 6, an air lock 7 and a three-way valve 8. A preparatory chamber is arranged inside the auxiliary kettle body 2, and the liquid adding pipe 3 and the air pipe 4 are installed on the top of the auxiliary kettle body 2. The liquid adding pipe 3 and the air pipe 4 are both connected to the preparatory chamber of the auxiliary kettle body 2. The three-way valve 5 is located between the main kettle body 1 and the auxiliary kettle body 2. The first channel of the three-way valve 5 is connected to the reaction chamber of the main kettle body 1, and the second channel of the three-way valve 5 is connected to the preparatory chamber of the auxiliary kettle body 2. The third channel of the three-way valve 5 is provided with a discharge pipe. The heater, the airlock 7 is installed on the main kettle body 1, the input end of the airlock 7 is installed with a hopper 6, the output end of the airlock 7 extends into the reaction chamber of the main kettle body 1, the three-way valve 28 is located on the main kettle body 1, the first channel of the three-way valve 28 is connected to the airlock 7, the second channel of the three-way valve 28 is connected to the reaction chamber of the main kettle body 1, the third channel of the three-way valve 28 is connected to the vacuum pump, and a stirring mechanism is installed in the reaction chamber of the main kettle body 1; it also includes a vibration rod 9 and a plurality of support rods 10, the vibration rod 9 is installed in the preparatory chamber of the auxiliary kettle body 2, and a plurality of support rods 10 are installed on the vibration rod 9; the stirring mechanism includes a motor 11, a stirring shaft 12, a plurality of stirring blades 13 and a plurality of guide holes 21, and the motor 11 is installed in the main kettle The main kettle body 1 is provided with a plurality of stirring blades 13 uniformly mounted on the stirring shaft 12 in the circumferential direction, and a plurality of stirring blades 13 are provided with flow guide holes 21; the main kettle body 1 is provided with a plurality of stirring blades 13 uniformly mounted on the stirring shaft 12 in the circumferential direction, and a plurality of stirring blades 13 are provided with flow guide holes 21; the main kettle body 1 is provided with a auger tube 14 and auger blades 15; the plurality of stirring blades 13 are connected to the bottom of the stirring shaft 12; the auger tube 14 is provided with a bracket inside the reaction chamber of the main kettle body 1; the auger tube 14 is sleeved on the outside of the stirring shaft 12; an outlet is provided at the lower end of the auger tube 14; an inlet is provided at the upper part of the auger tube 14; the auger blades 15 are provided on the outer wall of the stirring shaft 12; the auger blades 15 are provided inside the auger tube 14; the airlock chamber 7 includes an exhaust The exhaust box 16, the upper valve 17, the feeding pipe 18, the gate 19 and the exhaust pipe 20, the exhaust box 16 is installed on the main kettle body 1, the exhaust box 16 is provided with a cavity inside, the cavity of the exhaust box 16 is communicated with the first channel of the three-way valve 28 through the exhaust pipe 20, the upper end surface of the exhaust box 16 is provided with an opening communicated with the cavity, the feeding hopper 6 is installed on the opening of the exhaust box 16, the upper valve 17 is installed at the lower end of the feeding hopper 6, the lower end surface of the exhaust box 16 is provided with a discharge port, the discharge port is communicated with the cavity of the exhaust box 16, the feeding pipe 18 is installed at the lower part of the discharge port of the exhaust box 16, the lower end of the feeding pipe 18 extends into the reaction chamber of the main kettle body 1, the gate 19 is rotatably installed in the feeding pipe 18, and the gate 19 is driven by a servo motor;It also includes a material distribution box 22 and a material distribution assembly. The material distribution box 22 is installed on the upper part of the reaction chamber of the main kettle body 1. The material distribution chamber is arranged inside the material distribution box 22. The top of the material distribution chamber is connected with the lower end of the feeding pipe 18. The lower end surface of the material distribution box 22 is provided with a material distribution hole connected with the material distribution chamber. The material distribution box 22 is installed with a material distribution assembly. The material distribution assembly is linked with the stirring shaft 12. The material distribution assembly intermittently opens the material distribution hole. ;

[0020] During operation, the heaters on the main kettle body 1 and the auxiliary kettle body 2 preheat the main kettle body 1 and the auxiliary kettle body 2 to a specified temperature 1, and a liquid softener is directly added to the reaction chamber of the main kettle body 1 through the feeding hopper 6 and the airlock 7. The heater of the main kettle body 1 heats the softener to a specified temperature 2 and leaves it to stand for a period of time. During this process, all the measured tackifying resin is added to the preparatory chamber of the auxiliary kettle body 2 through the liquid adding pipe 3. The heater of the auxiliary kettle body 2 heats the tackifying resin to a specified temperature 3 and leaves it to stand for a period of time. The first channel and the second channel of the three-way valve 1 5 are connected, and high-pressure gas is input into the top of the preparatory chamber of the auxiliary kettle body 2 through the air pipe 4. At the same time, the second channel of the three-way valve 2 8 is connected to the third channel, and the vacuum pump is turned on to release the reaction chamber of the main kettle body 1. The gas in the upper part of the chamber should be extracted so that the tackifying resin in the preparatory chamber of the auxiliary kettle body 2 is input into the reaction chamber of the main kettle body 1 through the three-way valve 1 5. When the tackifying resin reaches the specified delivery amount, the three-way valve 1 5 closes all channels, and the three-way valve 2 8 keeps the air extraction state to keep the negative pressure in the reaction chamber of the main kettle body 1. The stirring mechanism in the reaction chamber of the main kettle body 1 stirs and mixes the tackifying resin and the softener until the tackifying resin is completely melted. The upper valve 17 is opened, and solid raw materials are added to the cavity of the exhaust box 16 through the feeding hopper 6. The upper valve 17 is closed, and the first channel of the three-way valve 2 8 is connected with the third channel, and the gas in the cavity of the exhaust box 16 is extracted through the exhaust pipe 20 and the three-way valve 2 8. The first channel of the three-way valve 2 8 is closed. The servo motor drives the gate plate 19 to rotate and open the feed pipe 18, so that the solid raw material in the cavity of the vacuum box 16 is added to the reaction chamber of the main kettle body 1 through the feed pipe 18 to react with the mixed liquid of the tackifier resin and the softener. The heater of the main kettle body 1 is turned on to maintain the temperature of the mixed liquid, and the antioxidant is added to the preparatory chamber of the auxiliary kettle body 2 through the liquid adding pipe 3. The first channel and the second channel of the three-way valve 5 are connected, and the air pipe 4 inputs high-pressure gas into the preparatory chamber of the auxiliary kettle body 2. The remaining tackifier resin and all antioxidants are input into the reaction chamber of the main kettle body 1 to participate in the reaction, and polyisobutylene is input into the preparatory chamber of the auxiliary kettle body 2 through the liquid adding pipe 3. The first channel and the second channel of the three-way valve 5 are connected, and the air pipe 4 inputs high-pressure gas into the preparatory chamber of the auxiliary kettle body 2. High-pressure gas is input into the preparatory chamber of the auxiliary kettle 2, and all polyisobutylene is input into the reaction chamber of the main kettle 1 to participate in the reaction. After thorough reaction, liquid hot melt adhesive is obtained. When the raw materials used in the main kettle 1 are reacted to obtain liquid hot melt adhesive, the hot melt adhesive is input into the preparatory chamber of the auxiliary kettle 2 through the three-way valve 5. The vibration rod 9 is turned on to drive the multiple support rods 10 to vibrate, and the bubbles in the hot melt adhesive are vibrated out to the upper part of the preparatory chamber of the auxiliary kettle 2. The air pipe 4 is connected to the vacuum pump to extract the gas. After the bubbles in the hot melt adhesive are exhausted, the second channel of the three-way valve 5 is connected to the third channel, so that the hot melt adhesive in the preparatory chamber of the auxiliary kettle 2 is discharged through the discharge pipe of the three-way valve 5, thereby reducing the bubbles in the hot melt adhesive and improving the quality of the hot melt adhesive.During the raw material reaction process, the motor 11 drives the stirring shaft 12 to rotate, and the stirring shaft 12 drives the multiple stirring blades 13 to rotate to stir and mix the reaction raw materials. The multiple guide holes 21 are provided to make the flow of raw materials more complicated. When the stirring shaft 12 drives the multiple stirring blades 13 to stir the reaction raw materials, the reaction raw materials at the bottom of the reaction chamber of the main kettle body 1 flow to the outside of the auger tube 14 under the action of centrifugal force, thereby reducing the pressure at the bottom outlet of the auger tube 14, and then reducing the internal pressure of the auger tube 14. The reaction raw materials at the upper part of the reaction chamber of the main kettle body 1 are sucked into the auger tube 14 through the inlet. The auger blades 15 rotate under the drive of the stirring shaft 12, so that the auger blades 15 push the raw materials in the auger tube 14 downward and push them out through the outlet of the auger tube 14, realizing the circulation of the reaction raw materials. When the stirring shaft 12 rotates, it drives the distribution component to move. When the distribution component opens the distribution hole of the distribution box 22, a part of the solid raw materials are put into the reaction chamber of the main kettle body 1 to avoid agglomerates caused by too much raw materials being put in at one time. ;

[0021] Compared with the prior art, an auxiliary kettle body is added, in which the preparatory processing of the liquid raw materials is carried out, thereby reducing the waiting time. Moreover, the liquid raw materials are added to the main kettle body in waves through the auxiliary kettle body, without the need for complicated opening and closing operations, thereby improving work efficiency. The sealing structure of the main kettle body is also eliminated, the structure is simplified, and the practicability is good. Example 2

[0022] like Figure 6 and Figure 7 As shown, on the basis of Example 1, the cloth distribution component includes a vertical rod 23, a plurality of paddles 24, a circular plate 25, a gear ring 26 and a gear 27. The vertical rod 23 is rotatably installed in the cloth distribution chamber of the cloth distribution box 22. The lower end of the vertical rod 23 extends below the cloth distribution box 22. A plurality of paddles 24 are installed on the vertical rod 23. The circular plate 25 is installed at the lower end of the vertical rod 23. The circular plate 25 is located below the cloth distribution box 22. The circular plate 25 is provided with one or more through holes matching the cloth distribution holes of the cloth distribution box 22. The outer wall of the circular plate 25 is provided with a gear ring 26. The gear ring 26 is installed on the outer wall of the circular plate 25. The wheel 27 is installed on the stirring shaft 12, and the gear 27 is meshed with the ring gear 26; when the stirring shaft 12 rotates, the gear 27 is driven to rotate, and the gear 27 meshes with the ring gear 26 to drive the circular plate 25 to rotate. When the through hole of the circular plate 25 is aligned with the distribution hole of the distribution box 22, the raw materials in the distribution chamber of the distribution box 22 are put into the reaction chamber of the main kettle body 1. At the same time, when the circular plate 25 rotates, it drives the vertical rod 23 and multiple paddles 24 to rotate, so that the multiple paddles 24 stir the raw materials in the distribution chamber of the distribution box 22 to avoid blockage, which has good practicality. Example 3

[0023] like Figure 8 and Fig. 9As shown, on the basis of Example 1, the material distribution component includes a vertical rod 28, a plurality of levers 29, a baffle 30, a half gear ring 31, a spring assembly 32 and a half gear 33. The vertical rod 28 is rotatably installed in the material distribution chamber of the material distribution box 22. The lower end of the vertical rod 28 extends out from the bottom of the material distribution box 22. A plurality of levers 29 are installed on the vertical rod 28. The baffle 30 is installed at the lower end of the vertical rod 28. The baffle 30 is located below the material distribution box 22 and blocks the material distribution holes of the material distribution box 22. The half gear ring 31 is installed at the edge of the baffle 30 away from the vertical rod 28. One end of the spring assembly 32 is connected to the lower end surface of the material distribution box 22, and the other end of the spring assembly 32 is connected to the baffle 30. The half gear 33 is installed on the stirring shaft 12, and the half gear 33 is meshed with the half gear ring 31.

[0024] When the stirring shaft 12 rotates, it drives the half gear 33 to rotate. When the half gear 33 is engaged with the half gear ring 31, the baffle 30 is driven to rotate around the vertical rod 28. When the baffle 30 does not block the distribution hole of the distribution box 22, the raw material is put into the reaction chamber of the main kettle body 1 through the distribution hole. When the half gear 33 is disengaged from the half gear ring 31, the elastic force of the spring assembly 32 resets the baffle 30. In this process, the baffle 30 drives the vertical rod 28 to reciprocate, and the vertical rod 28 drives multiple levers 29 to stir the raw materials in the distribution chamber of the distribution box 22 to avoid blockage, which has good practicality. Example 4

[0025] like Fig.10 and Fig.11 As shown, on the basis of Example 1, the material distribution assembly includes an arc groove 34, a vertical rod 35, a lever 36, a horizontal shaft 37, a plurality of spokes 38, a toothed disc 39, a driven gear 40, a bevel gear 1 41 and a bevel gear 2 42. The lower end surface of the material distribution box 22 is provided with an inward arc groove 34, and the material distribution hole of the material distribution box 22 is provided on the side wall of the arc groove 34. The vertical rod 35 is rotatably installed in the material distribution chamber of the material distribution box 22. The lower end of the vertical rod 35 passes through the arc groove 34 and extends out from the bottom of the material distribution box 22. A plurality of levers 36 are installed on the vertical rod 35. The horizontal shaft 37 is rotatably installed in the arc groove 34 through a bracket. The horizontal shaft 37 is located below the material distribution box 22. A plurality of spokes 38 are evenly installed on the circumference of the side wall of the horizontal shaft 37. The outer edges of the plurality of spokes 38 are in contact with the arc groove 34. A toothed disc 39 is concentrically installed on the horizontal shaft 37. A driven gear 40 is concentrically installed on the lower end of the vertical rod three 35. The driven gear 40 is meshed with the toothed disc 39. A bevel gear one 41 is concentrically installed on the end of the horizontal shaft 37. A bevel gear two 42 is concentrically installed on the stirring shaft 12. The bevel gear two 42 is meshed with the bevel gear one 41.

[0026] When the stirring shaft 12 rotates, it drives the bevel gear 2 42 to rotate, and the bevel gear 2 42 engages with the bevel gear 1 41 to drive the horizontal shaft 37 to rotate. The horizontal shaft 37 drives multiple spokes 38 to rotate. When the edge of the spoke 38 contacts the arc groove 34, the spoke 38 blocks the distribution opening on the arc groove 34. When the spoke 38 is separated from the arc groove 34, the raw material is put into the reaction chamber of the main kettle body 1 through the gap between the arc groove 34 and the spoke 38. In this process, the horizontal shaft 37 drives the toothed disc 39 to rotate, and the toothed disc 39 engages with the driven gear 40 to drive the vertical rod 35 to rotate. The vertical rod 35 drives multiple levers 36 to stir the raw materials in the distribution chamber of the distribution box 22 to avoid blockage, which has good practicality.

[0027] like Figures 1 to 11 As shown, a preparation process of a sanitary napkin hot melt adhesive of the present invention is: S1, the heaters on the main kettle body 1 and the auxiliary kettle body 2 preheat the main kettle body 1 and the auxiliary kettle body 2 to 150-160°C; S2, adding aromatic mineral oil as a softener to the reaction chamber of the main kettle body 1 through the feeding hopper 6 and the airlock 7, the heater of the main kettle body 1 heats the softener to 160-165° C. and leaves it to stand for 10-15 minutes, during which, adding tackifying resin to the preparatory chamber of the auxiliary kettle body 2 through the liquid adding pipe 3, the heater of the auxiliary kettle body 2 heats the tackifying resin to 160-165° C. and leaves it to stand for 10-15 minutes; S3, the first channel and the second channel of the three-way valve 15 are connected, and high-pressure gas is input to the top of the preparatory chamber of the auxiliary kettle body 2 through the air pipe 4. At the same time, the second channel of the three-way valve 28 is connected to the third channel, and the vacuum pump is turned on to extract the gas from the upper part of the reaction chamber of the main kettle body 1, so that 35%-40% of the tackifying resin in the preparatory chamber of the auxiliary kettle body 2 is input into the reaction chamber of the main kettle body 1 through the three-way valve 15. When the tackifying resin reaches the specified delivery amount, the three-way valve 15 closes all channels, and the three-way valve 28 keeps the vacuum state, so that the reaction chamber of the main kettle body 1 maintains a negative pressure, and the stirring mechanism in the reaction chamber of the main kettle body 1 stirs and mixes the tackifying resin and the softener until the tackifying resin is completely melted; S4, adding all the thermoplastic elastomer into the airlock 7 through the feeding hopper 6, closing the input end of the airlock 7, connecting the second channel of the three-way valve 8 with the third channel, pumping out the air inside the airlock 7, closing the second channel of the three-way valve 8, opening the output end of the airlock 7, adding the thermoplastic elastomer in waves to the mixed solution of the tackifying resin and the softener for reaction, and turning on the heater of the main kettle 1 to maintain the temperature of the mixed solution; S5, adding the antioxidant into the preparatory chamber of the auxiliary kettle body 2 through the liquid adding pipe 3, the first channel and the second channel of the three-way valve 5 are connected, the air pipe 4 inputs high-pressure gas into the preparatory chamber of the auxiliary kettle body 2, and the remaining tackifying resin and all the antioxidant are input into the reaction chamber of the main kettle body 1 to participate in the reaction; S6, polyisobutylene is fed into the preparatory chamber of the auxiliary kettle body 2 through the liquid feeding pipe 3, the first channel and the second channel of the three-way valve 5 are connected, and the gas pipe 4 feeds high-pressure gas into the preparatory chamber of the auxiliary kettle body 2, and all the polyisobutylene is fed into the reaction chamber of the main kettle body 1 to participate in the reaction, and liquid hot melt adhesive is obtained after thorough reaction; S7, the first channel of the three-way valve 1 5 is connected to the second channel, and high-pressure gas is input into the reaction chamber of the main kettle body 1 through the three-way valve 2 8, and the hot melt adhesive is input into the preparatory chamber of the auxiliary kettle body 2. The vibration rod 9 is turned on to drive the multiple support rods 10 to vibrate, and the bubbles in the hot melt adhesive are vibrated out to the upper part of the preparatory chamber of the auxiliary kettle body 2. The air pipe 4 is connected to the vacuum pump to extract the gas until the bubbles in the hot melt adhesive are exhausted and stop; S8, the second channel of the three-way valve 5 is connected to the third channel, and the air pipe 4 inputs high-pressure gas into the preparation chamber of the auxiliary kettle body 2, so that the liquid hot melt adhesive is discharged through the discharge pipe of the three-way valve 5, and the solid hot melt adhesive is obtained after cooling.

[0028] The main functions achieved by the present invention are: 1. By carrying out the preparatory treatment of liquid raw materials and adding materials in waves in the auxiliary kettle, the waiting time is reduced. In addition, liquid raw materials are added to the main kettle in waves through the auxiliary kettle, without the need for complicated opening and closing operations, thus improving work efficiency. 2. It can vibrate out the bubbles in the hot melt adhesive, reduce the bubbles in the hot melt adhesive, and improve the quality of the hot melt adhesive; 3. By circulating and stirring the raw materials, the reaction is accelerated and the stirring efficiency is improved; 4. The material distribution component is used to realize the feeding in waves to avoid the agglomeration caused by adding too much raw material at one time and improve the reaction efficiency.

[0029] The preparation process and equipment of the hot melt adhesive for sanitary napkins of the present invention are installed, connected or set in common mechanical ways, and can be implemented as long as they can achieve their beneficial effects; the main kettle body 1, auxiliary kettle body 2, three-way valve 1 5, feeding hopper 6, three-way valve 2 8, vibration rod 9, motor 11, stirring shaft 12, auger tube 14, auger blade 15, upper valve 17, gate 19, gear ring 26, gear 1 27, half gear ring 31, spring assembly 32, half gear 33, horizontal shaft 37, toothed disc 39, driven gear 40, bevel gear 1 41, bevel gear 2 42 of the preparation process and equipment of the hot melt adhesive for sanitary napkins of the present invention are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technicians in this field to make creative labor.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A preparation device for hot melt adhesive for sanitary napkins, comprising a main kettle body (1), wherein a reaction chamber is arranged inside the main kettle body (1); characterized in that: The auxiliary kettle (2) further comprises an auxiliary kettle body (2), a liquid adding pipe (3), an air pipe (4), a three-way valve (5), a feeding hopper (6), an air lock chamber (7) and a three-way valve (8). A preparatory chamber is arranged inside the auxiliary kettle body (2). The liquid adding pipe (3) and the air pipe (4) are installed on the top of the auxiliary kettle body (2). The liquid adding pipe (3) and the air pipe (4) are both connected to the preparatory chamber of the auxiliary kettle body (2). The three-way valve (5) is located between the main kettle body (1) and the auxiliary kettle body (2). The first channel of the three-way valve (5) is connected to the reaction chamber of the main kettle body (1), and the second channel of the three-way valve (5) is connected to the preparatory chamber of the auxiliary kettle body (2). The third channel of the three-way valve (5) is provided with a discharge pipe, a heater is installed on both the main kettle body (1) and the auxiliary kettle body (2), an air lock chamber (7) is installed on the main kettle body (1), a feeding hopper (6) is installed at the input end of the air lock chamber (7), and the output end of the air lock chamber (7) extends into the reaction chamber of the main kettle body (1), a three-way valve (8) is located on the main kettle body (1), a first channel of the three-way valve (8) is communicated with the air lock chamber (7), a second channel of the three-way valve (8) is communicated with the reaction chamber of the main kettle body (1), a third channel of the three-way valve (8) is connected to a vacuum pump, and a stirring mechanism is installed in the reaction chamber of the main kettle body (1).

2. The preparation device of hot melt adhesive for sanitary napkins according to claim 1, characterized in that: It also comprises a vibrating rod (9) and a plurality of supporting rods (10), wherein the vibrating rod (9) is installed in the preparation chamber of the auxiliary kettle body (2), and the plurality of supporting rods (10) are installed on the vibrating rod (9).

3. The preparation device of hot melt adhesive for sanitary napkins according to claim 1, characterized in that: The stirring mechanism comprises a motor (11), a stirring shaft (12), a plurality of stirring blades (13) and a plurality of flow guide holes (21); the motor (11) is mounted on the main kettle body (1); the output shaft of the motor (11) is transmission-connected to the stirring shaft (12); the stirring shaft (12) is rotatably mounted in the reaction chamber of the main kettle body (1); the plurality of stirring blades (13) are evenly mounted on the stirring shaft (12) along the circumferential direction; and the flow guide holes (21) are all provided on the plurality of stirring blades (13).

4. The preparation device of hot melt adhesive for sanitary napkins according to claim 3, characterized in that: The invention also comprises an auger tube (14) and auger blades (15), wherein the plurality of stirring blades (13) are connected to the bottom of the stirring shaft (12), the auger tube (14) is installed inside the reaction chamber of the main kettle body (1) via a bracket, the auger tube (14) is sleeved on the outside of the stirring shaft (12), an outlet is arranged at the lower end of the auger tube (14), an inlet is arranged at the upper part of the auger tube (14), the auger blades (15) are installed on the outer wall of the stirring shaft (12), and the auger blades (15) are located inside the auger tube (14).

5. The preparation device of hot melt adhesive for sanitary napkins according to claim 3, characterized in that: The airlock chamber (7) comprises an air extraction box (16), an upper valve (17), a feeding pipe (18), a gate plate (19) and an air extraction pipe (20). The air extraction box (16) is mounted on the main kettle body (1). A cavity is arranged inside the air extraction box (16). The cavity of the air extraction box (16) is connected to the first channel of the three-way valve (8) through the air extraction pipe (20). An opening is arranged on the upper end surface of the air extraction box (16) and is connected to the cavity. The feeding hopper (6) is mounted on the air extraction box (16). A valve (17) is installed at the lower end of the hopper (6) on the opening of the gas box (16); a discharge port is provided on the lower end surface of the vacuum box (16); the discharge port is communicated with the cavity of the vacuum box (16); a feed pipe (18) is installed at the lower part of the discharge port of the vacuum box (16); the lower end of the feed pipe (18) extends into the reaction chamber of the main kettle body (1); a gate plate (19) is rotatably installed in the feed pipe (18); and the gate plate (19) is driven by a servo motor.

6. The preparation device for hot melt adhesive for sanitary napkins according to claim 5, characterized in that: It also includes a material distribution box (22) and a material distribution assembly. The material distribution box (22) is installed at the upper part of the reaction chamber of the main kettle body (1). A material distribution chamber is arranged inside the material distribution box (22). The top of the material distribution chamber is connected to the lower end of the feed pipe (18). A material distribution hole connected to the material distribution chamber is arranged on the lower end surface of the material distribution box (22). The material distribution assembly is installed on the material distribution box (22). The material distribution assembly is linked to the stirring shaft (12). The material distribution assembly intermittently opens the material distribution hole.

7. The preparation device of hot melt adhesive for sanitary napkins according to claim 6, characterized in that: The material distribution component comprises a vertical rod (23), a plurality of paddles (24), a circular plate (25), a gear ring (26) and a gear (27). The vertical rod (23) is rotatably mounted in a material distribution chamber of a material distribution box (22). The lower end of the vertical rod (23) extends below the material distribution box (22). The plurality of paddles (24) are mounted on the vertical rod (23). The circular plate (25) is mounted on the lower end of the vertical rod (23). The circular plate (25) is located below the material distribution box (22). The circular plate (25) is provided with one or more through holes matching the material distribution holes of the material distribution box (22). The outer wall of the circular plate (25) is mounted with a gear ring (26). The gear (27) is mounted on the stirring shaft (12). The gear (27) meshes with the gear ring (26).

8. The preparation device for hot melt adhesive for sanitary napkins according to claim 6, characterized in that: The material distribution assembly comprises a second vertical rod (28), a plurality of second levers (29), a baffle (30), a half gear ring (31), a spring assembly (32) and a half gear (33). The second vertical rod (28) is rotatably mounted in a material distribution chamber of a material distribution box (22). The lower end of the second vertical rod (28) extends out from below the material distribution box (22). The plurality of second levers (29) are mounted on the second vertical rod (28). The baffle (30) is mounted on the lower end of the second vertical rod (28). The baffle (30) is located below the material distribution box (22) and blocks the material distribution hole of the material distribution box (22). A half gear ring (31) is installed on the edge of the baffle (30) away from the second vertical rod (28). One end of the spring assembly (32) is connected to the lower end surface of the material distribution box (22), and the other end of the spring assembly (32) is connected to the baffle (30). The half gear (33) is installed on the stirring shaft (12), and the half gear (33) is meshed with the half gear ring (31).

9. The preparation device for hot melt adhesive for sanitary napkins according to claim 6, characterized in that: The material distribution assembly comprises an arc groove (34), a vertical rod (35), a lever (36), a horizontal shaft (37), a plurality of spokes (38), a toothed disc (39), a driven gear (40), a bevel gear (41) and a bevel gear (42). The lower end surface of the material distribution box (22) is provided with an inwardly facing arc groove (34), a material distribution hole of the material distribution box (22) is provided on a side wall of the arc groove (34), the vertical rod (35) is rotatably mounted in the material distribution chamber of the material distribution box (22), the lower end of the vertical rod (35) passes through the arc groove (34) and extends out from the bottom of the material distribution box (22), a plurality of levers (36) are mounted on the vertical rod (35), and the horizontal shaft (37) passes through the arc groove (34). The bracket is rotatably mounted in the arc groove (34), the transverse shaft (37) is located below the material distribution box (22), a plurality of spokes (38) are evenly mounted on the circumference of the side wall of the transverse shaft (37), the outer edges of the plurality of spokes (38) are in contact with the arc groove (34), a toothed disc (39) is concentrically mounted on the transverse shaft (37), a driven gear (40) is concentrically mounted on the lower end of the vertical rod three (35), the driven gear (40) is meshed with the toothed disc (39), a bevel gear one (41) is concentrically mounted on the end of the transverse shaft (37), a bevel gear two (42) is concentrically mounted on the stirring shaft (12), and the bevel gear two (42) is meshed with the bevel gear one (41).

10. A process for preparing a sanitary napkin hot melt adhesive, characterized in that: The preparation device of the sanitary napkin hot melt adhesive as claimed in claim 2 comprises the following steps: S1, the heaters on the main kettle body (1) and the auxiliary kettle body (2) preheat the main kettle body (1) and the auxiliary kettle body (2) to 150-160°C; S2. Aromatic mineral oil is added as a softener into the reaction chamber of the main kettle (1) through the feeding hopper (6) and the airlock (7). The heater of the main kettle (1) heats the softener to 160-165° C. and leaves it to stand for 10-15 minutes. During this process, a tackifying resin is added into the preparatory chamber of the auxiliary kettle (2) through the liquid adding pipe (3). The heater of the auxiliary kettle (2) heats the tackifying resin to 160-165° C. and leaves it to stand for 10-15 minutes. S3, the first channel and the second channel of the three-way valve 1 (5) are connected, and high-pressure gas is input into the top of the preparatory chamber of the auxiliary kettle body (2) through the air pipe (4). At the same time, the second channel of the three-way valve 2 (8) is connected to the third channel. The vacuum pump is turned on to extract the gas from the upper part of the reaction chamber of the main kettle body (1), so that 35%-40% of the tackifying resin in the preparatory chamber of the auxiliary kettle body (2) is input into the reaction chamber of the main kettle body (1) through the three-way valve 1 (5). When the tackifying resin reaches the specified delivery amount, the three-way valve 1 (5) closes all channels, and the three-way valve 2 (8) maintains the vacuum state, so that the reaction chamber of the main kettle body (1) maintains a negative pressure. The stirring mechanism in the reaction chamber of the main kettle body (1) stirs and mixes the tackifying resin and the softener until the tackifying resin is completely melted; S4, adding all the thermoplastic elastomer into the airlock (7) through the feeding hopper (6), closing the input end of the airlock (7), connecting the second channel of the three-way valve (8) to the third channel, pumping out the air inside the airlock (7), closing the second channel of the three-way valve (8), opening the output end of the airlock (7), adding the thermoplastic elastomer in waves to the mixed solution of the tackifying resin and the softener for reaction, and turning on the heater of the main kettle (1) to maintain the temperature of the mixed solution; S5, adding the antioxidant into the preparatory chamber of the auxiliary kettle (2) through the liquid adding pipe (3), connecting the first channel and the second channel of the three-way valve (5), inputting high-pressure gas into the preparatory chamber of the auxiliary kettle (2) through the gas pipe (4), and inputting the remaining tackifying resin and all the antioxidant into the reaction chamber of the main kettle (1) to participate in the reaction; S6, polyisobutylene is introduced into the preparatory chamber of the auxiliary kettle (2) through the liquid adding pipe (3), the first channel and the second channel of the three-way valve (5) are connected, and the gas pipe (4) introduces high-pressure gas into the preparatory chamber of the auxiliary kettle (2), so that all the polyisobutylene is introduced into the reaction chamber of the main kettle (1) to participate in the reaction, and a liquid hot melt adhesive is obtained after the reaction is completely completed; S7, the first channel and the second channel of the three-way valve 1 (5) are connected, and high-pressure gas is input into the reaction chamber of the main kettle body (1) through the three-way valve 2 (8), and the hot melt adhesive is input into the preparatory chamber of the auxiliary kettle body (2). The vibration rod (9) is opened to drive the plurality of support rods (10) to vibrate, and the bubbles in the hot melt adhesive are vibrated out to the upper part of the preparatory chamber of the auxiliary kettle body (2). The air pipe (4) is connected to the vacuum pump to extract the gas, and the process stops when all the bubbles in the hot melt adhesive are exhausted; S8, the second channel of the three-way valve (5) is connected to the third channel, so that the three gas pipes (4) input high-pressure gas into the preparation chamber of the auxiliary kettle (2), so that the liquid hot melt adhesive is discharged through the discharge pipe of the three-way valve (5), and solid hot melt adhesive is obtained after cooling.

Images