Atomization device and EVA hot melt adhesive production system with atomization device

Abstract

The utility model belongs to the technical field of hot melt adhesive production, and particularly relates to an atomization device and an EVA hot melt adhesive production system with the atomization device.The atomization device comprises an auxiliary solution storage tank, a metering pump, a valve FV and an atomization nozzle; a discharging pipe is arranged in an auxiliary solution storage tank in the atomizing device, the distance between an inlet of the discharging pipe and the bottom of the auxiliary solution storage tank is 5-8 mm, and an outlet of the discharging pipe is sequentially connected with a metering pump, a valve FV and an atomizing nozzle. The EVA hot melt adhesive production system with the atomizing device further comprises a dehydrator and a vibrating screen, and the atomizing nozzle is mounted on a pipeline I between the dehydrator and the vibrating screen. Compared with the EVA hot melt adhesive production system without the atomization device, the EVA hot melt adhesive production system with the atomization device has the advantages that the cleaning time of scale deposit of the pipeline I is relatively prolonged by 0.67-1.00 times, and the time from bagging to hardening of EVA hot melt adhesive particles is relatively prolonged by 3.00-4.90 times.

Description

Technical Field

[0001] The present application belongs to the technical field of hot melt adhesive production, and in particular relates to an atomizing device and an EVA hot melt adhesive production system with the atomizing device. Background Art

[0002] In the traditional EVA hot melt adhesive production industry, due to the appearance characteristics of EVA hot melt adhesive, after being bagged, stacked and stored for a period of time, serious particle adhesion and even large block compaction usually occur, affecting product quality and subsequent use. The existing technology usually adopts the method of adding additives to the EVA hot melt adhesive particles before bagging to achieve the effect of preventing the EVA hot melt adhesive particles from sticking and compaction. However, this addition method cannot guarantee that all the surfaces of the EVA hot melt adhesive particles are attached by the additives, nor can it guarantee the uniformity of the additives attached to the surfaces of all the EVA hot melt adhesive particles. Therefore, the anti-caking effect is poor. At the same time, during the production process, EVA hot melt adhesive particles easily adhere to pipes, causing scaling of the pipes in the production system, requiring frequent cleaning, and increasing production costs. Summary of the Invention

[0003] One of the purposes of this application is to provide an atomizing device to solve the above-mentioned technical problems such as poor anti-caking effect of EVA hot melt adhesive particles and scaling of pipelines in the production system.

[0004] The second purpose of this application is to provide an EVA hot melt adhesive production system with the above-mentioned atomization device.

[0005] The technical solution of this application is as follows:

[0006] In the first aspect, an atomizing device adopts the following technical solution

[0007] An atomizing device includes an additive solution storage tank, a metering pump, a valve FV, and an atomizing nozzle. The atomizing nozzle includes an atomizing nozzle body and an atomizing needle. The atomizing nozzle body is provided with a liquid inlet, an air inlet, and a liquid outlet. The atomizing needle is provided at the front end of the atomizing nozzle body and directly faces the liquid outlet of the atomizing nozzle body.

[0008] A discharge pipe is provided in the auxiliary solution storage tank in the atomizing device. The inlet of the discharge pipe is 5-8 mm away from the bottom of the auxiliary solution storage tank. The outlet of the discharge pipe is connected to the liquid inlet of the atomizing nozzle body through a metering pump and a valve FV in sequence. The air inlet of the atomizing nozzle body is connected to the compressed air input pipe.

[0009] The valve FV is a one-way valve, and its installation position is set at 0.2-0.3m from the liquid inlet of the atomizing nozzle body;

[0010] Preferably, the atomizing nozzle is model SK508, produced by Dongguan Hengxin Spray Technology Co., Ltd. The inner diameter of the liquid nozzle of the atomizing nozzle body of the atomizing nozzle is 3 mm, and the inner diameters of the liquid inlet and air inlet of the atomizing nozzle body are both 10 mm.

[0011] The above-mentioned atomizing device can accurately measure the amount of additives and the spray effect. After being used in the EVA hot melt adhesive production system, it can relatively extend the time required for cleaning the pipe fouling of the EVA hot melt adhesive production system and the time from the start of stacking to the start of solidification of EVA hot melt adhesive particles, thereby relatively reducing the production cost of EVA hot melt adhesive and improving production efficiency. The added atomizing device is simple to operate, and the production and use process is safe and reliable.

[0012] In the second aspect, an EVA hot melt adhesive production system with an atomizing device adopts the following technical solutions

[0013] An EVA hot melt adhesive production system with an atomizing device, comprising the above-mentioned atomizing device, a dehydrator and a vibrating screen;

[0014] The material outlet of the dehydrator is connected to the material inlet of the vibrating screen through a pipe I. The pipe I is divided into a horizontal section and a vertical section. The horizontal section of the pipe I after the material outlet of the dehydrator is inclined downward by 30-45 degrees. The length of the horizontal section of the pipe I is 1.0-1.2m. The vertical section of the pipe I is perpendicular to the material inlet of the vibrating screen.

[0015] The installation position of the atomizing nozzle is in the transverse section of the pipeline 1, and is on the upper half of the cross section of the pipeline 1 at a distance of 0.8-0.9m from the material outlet of the dehydrator, more preferably installed at the midpoint of the upper half of the cross section of the pipeline 1 at a distance of 0.8-0.9m from the material outlet of the dehydrator;

[0016] The connection between the atomizing nozzle and the pipe 1 can be achieved by threading a male threaded connector provided on the atomizing nozzle and a female threaded connector welded on the pipe 1; or by flange-fitting a flange connector provided on the atomizing nozzle and a corresponding flange connector welded on the pipe 1.

[0017] The ratio of the inner diameter of the liquid nozzle on the atomizing nozzle body of the atomizing nozzle to the inner diameter of the pipe I is 3:100;

[0018] The installation angle of the atomizing nozzle on the pipe I is 30-90° between the center line of the atomizing nozzle body and the direction of material flow in the pipe I;

[0019] Preferably, the installation angle of the atomizing nozzle on the pipeline 1 is 45-80 degrees according to the angle between the center line of the atomizing nozzle body and the direction of the material flow in the pipeline 1.

[0020] Further preferably, the installation angle of the atomizing nozzle on the pipeline 1 is 45° between the center line of the atomizing nozzle body of the atomizing nozzle and the direction of material flow in the pipeline 1;

[0021] The atomizing needle of the atomizing nozzle extends into the inner wall of the pipe 1 and protrudes from the inner wall by a length of -0.5-4.0 cm. The purpose is to allow the additive solution to be evenly sprayed onto the surface of the EVA hot melt adhesive particles after being atomized by the atomizing needle. However, if the atomizing needle extends too far into the inner wall or retracts into the inner wall, the spray range will be located at the edge of the pipe 1. The additive mist that contacts the edge of the pipe 1 will easily condense into water droplets and slide down on the pipe 1, thereby affecting the dispersion of the additive onto the surface of the EVA hot melt adhesive particles and affecting the anti-caking effect of the EVA hot melt adhesive particles after palletizing. If the atomizing needle extends too far into the inner wall, the service life of the atomizing needle will be shortened. At the same time, if the additive mist sprayed from the atomizing nozzle contacts the pipe 1, it will form liquid droplets and fall on the pipe wall.

[0022] Preferably, the atomizing needle of the atomizing nozzle extends into the inner wall of the pipe 1 and protrudes from the inner wall by a length of 2-3 cm. In this way, the crude EVA hot melt adhesive particles in production can be atomized by the additive as soon as they enter the pipe 1, thereby effectively preventing the crude EVA hot melt adhesive particles from scaling in the pipe 1. In addition, when the crude EVA hot melt adhesive particles pass through the vibrating screen later, they are less likely to clog the vibrating screen and cause production abnormalities, thereby improving production continuity and production efficiency.

[0023] Further preferably, the atomizing needle of the atomizing nozzle extends into the inner wall of the pipe 1 and protrudes from the inner wall by a length of 3 cm.

[0024] More preferably, the installation angle of the atomizing nozzle on the pipe I is 45° according to the angle between the center line of the atomizing nozzle body of the atomizing nozzle and the direction of material flow in the pipe I; the installation depth of the atomizing nozzle on the pipe I is 3 cm according to the length of the atomizing needle of the atomizing nozzle extending into the inner wall of the pipe I and protruding from the inner wall.

[0025] Beneficial technical effects of this application

[0026] The atomizing device of the present application, when used in an existing EVA hot melt adhesive production system, achieves precise metering of the additive due to the use of a metering pump in the atomizing device, and the synergistic effects of the installation position and angle of the atomizing nozzle on the pipe I between the dehydrator and the vibrating screen, as well as the length of the atomizing nozzle's atomizing needle extending into the pipe I. This allows the additive mist to fully adhere to the surface of the EVA hot melt adhesive particles, thereby improving the technical problems of scale accumulation in the pipe I of the EVA hot melt adhesive production system and the poor anti-caking effect of the EVA hot melt adhesive particles. Compared with the existing EVA hot melt adhesive production system (which does not have an additional atomizing device and uses the same additives and the same dosage to treat the EVA hot melt adhesive particles before bagging), the time required to clean the scale in pipe I is relatively extended by 0.67-1.00 times, thereby relatively reducing production costs and improving production efficiency. The time from bagging and stacking to the start of caking of the EVA hot melt adhesive particles during storage is relatively extended by 3.00-4.90 times.

[0027] Furthermore, the EVA hot melt adhesive production system with an atomizing device of the present application can not only effectively extend the time required to clean the scale accumulation in pipeline I and the time from the start of stacking to the start of hardening of the EVA hot melt adhesive particle product, but also, due to the use of a metering pump in the atomizing device, it can achieve automatic and accurate metering of additives. Under the premise of a specified amount of additives, the quality of the EVA hot melt adhesive particle product will not be affected by the addition of additives. At the same time, after one and a half years of product application by customers, it has been verified that the addition of additives does not affect the quality of the EVA hot melt adhesive particle product.

[0028] Furthermore, the EVA hot melt adhesive production system with an atomization device of the present application has the advantages of simple operation and a safe and reliable production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 , a schematic diagram of a process flow of an atomizing device according to Example 1, wherein 1 is an additive solution storage tank, 2 is a metering pump, 3 is a valve FV, and 4 is an atomizing nozzle;

[0030] Figure 2 、 one A process flow diagram of an EVA hot melt adhesive production system with an atomizing device according to Example 1, wherein 1 is an additive solution storage tank, 2 is a metering pump, 3 is a valve FV, 4 is an atomizing nozzle, 5 is a dehydrator, 6 is a vibrating screen, 7 is a stirring kettle, 8 is a melt pump, 9 is a filtering device, 10 is an extrusion die head, 11 is an underwater pelletizer, 12 is a constant temperature water tank, 13 is a water circulation pump, 14 is a blower, 15 is an air dryer, 16 is a receiving tank for EVA hot melt adhesive particles, 17 is a discharge valve FI, 18 is a valve FII, 19 is a valve FIII, 20 is a valve FIV, 21 is a valve FVI, and 22 is a valve FVII;

[0031] Figure 3 , a schematic diagram of the production process flow of the EVA hot melt adhesive production system without an atomizing device in the comparative embodiment, wherein 5 is a dehydrator, 6 is a vibrating screen, 7 is a stirring kettle, 8 is a melt pump, 9 is a filtering device, 10 is an extrusion die head, 11 is an underwater pelletizer, 12 is a constant temperature water tank, 13 is a water circulation pump, 14 is a blower, 15 is a blast dryer, 16 is a receiving tank for EVA hot melt adhesive particles, 17 is a discharge valve FI, 18 is a valve FII, 19 is a valve FIII, and 20 is a valve F DETAILED DESCRIPTION

[0032] The present application is further described below through specific embodiments in conjunction with the accompanying drawings, but the present application is not limited thereto.

[0033] The models and manufacturers of the special equipment used in the examples of this application are as follows:

[0034] Device Name model Manufacturer's information stirred tank HT250L Linyi Haixin Chemical Equipment Co., Ltd. melt pump MP-M-2500CC Zhengzhou Haike Melt Pump Co., Ltd. Filtration device HK-DP-2R-250 Zhengzhou Haike Melt Pump Co., Ltd. Extrusion die head 012 Suzhou DMG Precision Tools Co., Ltd. Underwater pelletizer KSFM-2000 Taizhou Kefei Rubber and Plastic Machinery Co., Ltd. Dehydrator KSFM-2000 Taizhou Kefei Rubber and Plastic Machinery Co., Ltd. Vibrating screen ZS-820 Xinxiang Tuowei Machinery Manufacturing Co., Ltd. Atomizing nozzle SK508 Dongguan Hengxin Spray Technology Co., Ltd. metering pumps CT-005-10 Dongguan Hongqiang Environmental Protection Engineering Co., Ltd.

[0035] Method for determining when to clean the fouling in the pipeline 1 in each application embodiment of the present application:

[0036] For EVA hot melt adhesive production systems with or without atomizers, assuming eight batches per day (each batch operating continuously for 2 hours), with a 1-1.5 hour interval between each batch, the cleaning time for Pipeline I (the pipe between the dehydrator and the vibrating screen) is calculated from the time it is newly commissioned or the time it was last cleaned to the time a layer of granular powder with a thickness of more than 0.5 cm accumulates on the inner wall of Pipeline I.

[0037] Method for determining the time when the hot melt adhesive granules for book binding obtained in each application example of the present application begin to harden after being bagged:

[0038] The time from the time when 25 kg of hot melt adhesive granules for book binding are bagged to the time when agglomerates larger than 5 cm*5 cm*5 cm are formed is recorded as the time when agglomeration begins.

[0039] Example 1

[0040] An atomizing device, the process flow diagram of which is as follows Figure 1 As shown, it includes an additive solution storage tank 1, a metering pump 2, a valve FV3 and an atomizing nozzle 4;

[0041] The atomizing nozzle 4 is model SK508 and is produced by Dongguan Hengxin Spray Technology Co., Ltd.

[0042] The atomizing nozzle 4 includes an atomizing nozzle body and an atomizing needle. The atomizing nozzle body is provided with a liquid inlet, an air inlet and a liquid outlet. The atomizing needle is provided at the front end of the atomizing nozzle body and is directly opposite to the liquid outlet of the atomizing nozzle body.

[0043] The inner diameter of the liquid nozzle of the atomizing nozzle body of the atomizing nozzle 4 is 3 mm, and the inner diameters of the liquid inlet and the air inlet of the atomizing nozzle body are both 10 mm;

[0044] A discharge pipe is provided in the auxiliary solution storage tank 1 in the atomizing device. The inlet of the discharge pipe is 5-8 mm away from the bottom of the auxiliary solution storage tank 1. The outlet of the discharge pipe is connected to the liquid inlet of the atomizing nozzle 4 through the metering pump 2 and the valve FV3 in sequence. The air inlet of the atomizing nozzle 4 is connected to the compressed air input pipe.

[0045] The valve FV3 is a one-way valve, which is installed at a position 0.2-0.3m close to the liquid inlet of the atomizing nozzle body, in order to prevent the auxiliary solution from flowing back when the atomizing device is in use. Example 2

[0046] An EVA hot melt adhesive production system with a set of atomizing devices described in Example 1, the process flow chart of which is as follows Figure 2 As shown, in addition to the auxiliary solution storage tank 1, the metering pump 2, the valve FV3 and the atomizing nozzle 4, the dehydrator 5, the vibrating screen 6, the stirring kettle 7, the melt pump 8, the filtering device 9, the extrusion die 10, the underwater pelletizer 11, the constant temperature water tank 12, the water circulation pump 13, the blower 14, the air dryer 15, the receiving tank 16 for the EVA hot melt adhesive particles, the discharge valve FI17, the valve FII18, the valve FIII19, the valve FIV20, the valve FVI21 and the valve FVII22;

[0047] The stirring kettle 7 is provided with a feeding port and a bottom discharge port. The bottom discharge port of the stirring kettle 7 is connected to the melt pump 8, the filtering device 9 and the extrusion die head 10 in sequence through the pipeline after the discharge valve FI17;

[0048] The melt pump 8 has a pump speed of 26-28 r / min and a delivery rate of 22 kg / min;

[0049] The filter hole diameter of the filter device 9 is 200 μm;

[0050] The outer ring of the extrusion die 10 is provided with 60 holes, each of which is a circular hole with a diameter of 3 mm ± 0.1 mm. The extrusion die 10 extrude the filtered EVA hot melt adhesive melt through the extrusion die 10 and then pelletizes it underwater in the underwater pelletizer 11. By controlling the cutting speed of the underwater pelletizer 11 accordingly, crude EVA hot melt adhesive particles meeting the required particle size can be obtained.

[0051] The underwater pelletizer 11 is also provided with a cooling water supply port and a material discharge port; the underwater pelletizer 11 has a cutting speed of 1000 r / min during operation;

[0052] The constant temperature water tank 12 is provided with a water inlet and a water outlet. The water supply pipe is connected to the water inlet of the constant temperature water tank 12 through a valve FII18. The water outlet of the constant temperature water tank 12 is connected to the cooling water supply port of the underwater pelletizer 11 through a pipe via a water circulation pump 13 to provide the cooling water required by the underwater pelletizer 11.

[0053] The outer ring of the extrusion die 10 is provided with 60 holes, each of which is a circular hole with a diameter of 3 mm ± 0.1 mm;

[0054] The dehydrator 5 is provided with a material tangent inlet, a discharge port and a drain port; the dehydrator 5 is a high-speed centrifuge with a rotation speed of 1200r / min;

[0055] The material discharge port of the underwater pelletizer 11 is connected to the material tangent inlet of the dehydrator 5 through a pipeline, so as to discharge the crude EVA hot melt adhesive particles obtained after underwater cutting in the underwater pelletizer 11 together with water into the dehydrator 5;

[0056] The drain outlet on the dehydrator 5 flows back into the constant temperature water tank 12 through the valve FIII19, so as to realize the recycling and reuse of the cooling water used in the underwater pelletizer 11 in the production process, thereby saving water and energy;

[0057] A branch pipe is provided on the pipe between valve FIII19 and dehydrator 5, which passes through valve FIV20 and goes to the factory sewage collection point, so that the waste liquid generated during the dehydrator cleaning can enter the factory's unified three-waste treatment system for treatment;

[0058] The material outlet of the dehydrator 5 is connected to the material inlet of the vibrating screen 6 through a pipe 1;

[0059] The vibrating screen 6 also has a material outlet;

[0060] The above-mentioned pipeline I is divided into a horizontal section and a vertical section. The horizontal section of the pipeline I is inclined downward at 45° from the material outlet of the dehydrator. The length of the horizontal section of the pipeline I is 1.2m. The vertical section of the pipeline I is perpendicular to the material inlet of the vibrating screen 6.

[0061] The blast dryer comprises a blast dryer 15 and a blower 14, and the blast dryer 15 is provided with a tangential feed port and a bottom discharge port;

[0062] The material outlet of the vibrating screen 6 is connected to the tangential feed port of the blast dryer 15 through a pipeline;

[0063] The receiving tank 16 for EVA hot melt adhesive particles is provided at the bottom discharge port of the blast dryer 15 and is used to receive the EVA hot melt adhesive particles after being air-dried by the blast dryer 15;

[0064] The blower 14 is used to supply air to the blast dryer 15, and the air supply pressure is 0.25Mpa and the temperature is 37-39°C;

[0065] A branch pipe is provided on the pipe between the material outlet of the vibrating screen 6 and the tangential feed port of the blast dryer 15. The branch pipe is connected to the blower 14 and is 0.2-0.3 m away from the material outlet of the vibrating screen 6.

[0066] The atomizing nozzle 4 of the atomizing device is installed on the transverse section of the pipe 1 from the material outlet of the dehydrator 5 to the material inlet of the vibrating screen 6, and at the midpoint of the upper half of the pipe cross section of the pipe 1 0.9 m away from the material outlet of the dehydrator 5 (the midpoint of the upper half of the pipe is the middle position of the upper half of the pipe cross section of the pipe 1 0.9 m away from the material outlet of the dehydrator 5);

[0067] The ratio of the inner diameter of the liquid nozzle on the atomizing nozzle body of the atomizing nozzle 4 to the inner diameter of the pipe 1 is 3:100;

[0068] The connection between the atomizing nozzle 4 and the pipe 1 is achieved by threadedly connecting an external threaded connector provided on the atomizing nozzle 4 with an internal threaded connector welded on the pipe 1.

[0069] The installation angle of the atomizing nozzle 4 is such that the angle between the center line of the atomizing nozzle body of the atomizing nozzle 4 and the direction of the material flow in the pipeline 1 is 60°;

[0070] The installation depth of the atomizing nozzle 4 is 2.0 cm, which is the length of the atomizing needle of the atomizing nozzle 4 extending into the inner wall of the pipe 1 and protruding from the inner wall;

[0071] The air inlet on the atomizing nozzle body of the atomizing nozzle 4 is connected to the compressed air input pipeline via a valve FVI21;

[0072] The bottom of the auxiliary solution storage tank 1 in the atomizing device is also provided with a sewage outlet, which is discharged to the factory sewage collection point through a pipeline via valve FVII22, so that the waste liquid generated during the cleaning of the auxiliary solution storage tank can enter the factory's unified three-waste treatment system for treatment.

[0073] Comparative Example

[0074] An EVA hot melt adhesive production system, which differs from Example 2 only in that it does not contain an atomizing device, and is otherwise the same as Example 1. The specific process flow chart is as follows: Figure 3As shown, it includes a stirring kettle 7, a melt pump 8, a filtering device 9, an extrusion die 10, an underwater pelletizing device 11, a constant temperature water tank 12, a water circulation pump 13, a dehydrator 5, a vibrating screen 6, a blower 14, an air dryer 15, a receiving tank 16 for EVA hot melt adhesive particles, a valve FI17, a valve FII18, a valve FIII19, and a valve FIV20.

[0075] Examples 3-6

[0076] An EVA hot melt adhesive production system with the atomizing device described in Example 1, except that the installation angle of the atomizing nozzle 4 on the transverse section of the pipeline I is 30, 45, 80, and 90° respectively according to the center line of the atomizing nozzle body of the atomizing nozzle 4 and the material flow direction in the pipeline I, other uniformities are the same as those in Example 2.

[0077] Examples 7-12

[0078] An EVA hot melt adhesive production system with the atomizing device described in Example 1 is the same as that in Example 2, except that the atomizing needle of the atomizing nozzle 4 extends into the inner wall of the pipe I and protrudes from the inner wall by a length of -0.5 cm (referring to 0.5 cm retracted into the inner wall), 0 cm, 1 cm, 3 cm, 3.5 cm, and 4 cm, respectively. Example 13

[0079] An EVA hot melt adhesive production system with the atomizing device described in Example 1 is the same as Example 2 except for the following differences:

[0080] The installation angle of the atomizing nozzle 4 is such that the angle between the center line of the atomizing nozzle body of the atomizing nozzle 4 and the direction of the material flow in the pipeline 1 is 45°;

[0081] The installation depth of the atomizing nozzle 4 is 3.0 cm, which is the length of the atomizing needle of the atomizing nozzle 4 extending into the inner wall of the pipe 1 and protruding from the inner wall.

[0082] Application Example 1

[0083] The EVA hot melt adhesive production system with an atomizing device according to Example 2 is used to produce hot melt adhesive for book binding:

[0084] The raw materials used in the preparation of the hot melt adhesive for book binding are calculated by weight, and their composition and content are as follows:

[0085] Non-static α-olefin copolymer (508 from Evonik Industries) 18 parts

[0086] Hydrogenated alicyclic hydrocarbon resin (Elkson Mobil 5400) 21.5 parts

[0087] Ethylene-methyl methacrylate copolymer (Sumitomo Chemical Co., Ltd. 5022) 22 parts

[0088] Pure monomer resin (SA85 from Pressure Sana Chemical Company) 19 parts

[0089] #64 Paraffin (Sinopec Group) 18 parts

[0090] Titanium dioxide (R298 from Panzhihua Iron and Steel Group Co., Ltd.) 1 part

[0091] Antioxidant (antioxidant R298 from Panzhihua Iron and Steel Group Co., Ltd.) 0.5 parts;

[0092] The amount of the auxiliary agent used in the preparation of the hot melt adhesive for book binding (organic silicone anti-adhesive, SH3011, Shanghai Chuyijia Silicone Materials Co., Ltd.) is 0.07 parts, that is, the amount of the auxiliary agent is 0.07% of the total weight of the raw materials used in the preparation of the hot melt adhesive for book binding;

[0093] The preparation method of the hot melt adhesive for book binding comprises the following specific steps:

[0094] (1) All raw materials for preparing the hot melt adhesive for book binding are melted in a stirring kettle 7 to obtain a melt of the hot melt adhesive for book binding;

[0095] (2) Add the additive into the additive solution storage tank 1, then add water and stir evenly to obtain an additive aqueous solution with a mass percentage concentration of 25%;

[0096] (3) The melt of the hot melt adhesive for book binding obtained in step (1) is filtered by a filter device 9 under the power of a melt pump 8, extruded by an extrusion die 10, and then enters an underwater pelletizer 11 for underwater pelletizing;

[0097] The pump speed of the melt pump 8 is 28 r / min, and the delivery rate of the melt material of the hot melt adhesive used for book binding is 20-25 kg / min;

[0098] During the pelletizing process, the temperature of the cooling water in the constant temperature water tank 12 is controlled to be 15° C. The cooling water in the constant temperature water tank 12 is pumped into the underwater pelletizer through the water circulation pump 13. The cutting speed of the underwater pelletizer 11 during underwater cutting is 1000 r / min.

[0099] (4) The crude EVA hot melt adhesive particles obtained after the water pelletizing in step (3) and the mixture of cooling water are put into the dehydrator 5 for centrifugal separation and dehydration to achieve the separation of the crude EVA hot melt adhesive particles and cooling water;

[0100] The cooling water separated by the dehydrator 5 enters the constant temperature water tank 12 through the valve FIII19 for recycling;

[0101] The centrifugal separation process of the dehydrator 5 is controlled at a speed of 1200 r / min;

[0102] The flow rate of the crude EVA hot melt adhesive particles when they come out of the material outlet on the dehydrator 5 is 0.35 kg / s;

[0103] (5) Open valves FV3 and FVI21, start metering pump 2, and the additive solution in the additive solution storage tank 1 is atomized by the metering pump 2 after passing through valve FV3 and then sprayed into the pipe I between the dehydrator 5 and the vibrating screen 6 downstream, spraying the crude hot melt adhesive particles for book binding that have been dehydrated by the dehydrator 5 in step (4) to obtain the atomized crude hot melt adhesive particles for book binding;

[0104] During the above-mentioned spraying process, the compressed air inputted into the air inlet on the atomizing nozzle body of the atomizing nozzle 4 has a pressure of 0.4 MPa and a flow rate of 60 mL / min, and the auxiliary agent solution inputted into the liquid inlet on the atomizing nozzle body of the atomizing nozzle 4 has a flow rate of 18 mL / min;

[0105] (6) The crude hot melt adhesive particles for book binding atomized in step (5) enter the vibrating screen 9 through the pipeline I for screening to remove particles with a diameter greater than 7 mm and particles with a diameter less than 5 mm and fine powder. The qualified crude hot melt adhesive particles for book binding that have been screened out are air-dried in the blast dryer 15. The obtained finished hot melt adhesive particles for book binding enter the receiving tank 16 for EVA hot melt adhesive particles and are bagged and stacked according to the specification of 25 kg / bag.

[0106] The diameter of the qualified hot melt adhesive particles for book binding is 5-7mm;

[0107] The air used in the blast dryer 15 is supplied by the blower 14, and the pressure of the supplied air is 0.25 MPa and the temperature is 38°C.

[0108] Application Comparative Example

[0109] An EVA hot melt adhesive production system (i.e., an EVA hot melt adhesive production system without an atomizing device) of the comparative example was used to produce hot melt adhesive for book binding. The raw materials used in the preparation of the hot melt adhesive for book binding, calculated by weight, had the same composition and content as those in Application Example 1.

[0110] The preparation method of the hot melt adhesive for book binding comprises the following specific steps:

[0111] (1) The same as step (1) of application example 1 is used to obtain a melt of hot melt adhesive for book binding;

[0112] (2) The same as step (2) of Example 1 is used to obtain an aqueous solution of the auxiliary agent with a mass percentage concentration of 25%;

[0113] (3) Underwater pelletizing is the same as step (3) of Application Example 1;

[0114] (4) Dehydration after underwater pelletizing is the same as step (4) of Application Example 1;

[0115] (5) After dehydration in the dehydrator 5 in step (4), the crude hot melt adhesive particles for book binding enter the vibrating screen 6 through the pipeline I for screening to remove particles with a diameter greater than 7 mm and particles with a diameter less than 5 mm and fine powder. The qualified hot melt adhesive particles for book binding that have been screened out are air-dried in the blast dryer 15 and then enter the receiving storage tank 16 for EVA hot melt adhesive particles. Then, the auxiliary agent aqueous solution with a mass percentage concentration of 25% obtained in step (2) is added to the EVA hot melt adhesive particles and stirred to mix evenly. The particles are then bagged and stacked according to the specification of 25 kg / bag.

[0116] The diameter of qualified hot melt adhesive particles for book binding is 5-7mm;

[0117] The air used in the blast dryer 15 is supplied by the blower 14, and the pressure of the supplied air is 0.25 MPa and the temperature is 38°C.

[0118] Application Examples 2-12

[0119] The EVA hot melt adhesive production system with an atomizing device according to Example 3-13 is used to produce hot melt adhesive for book binding, as follows:

[0120] The composition and content of the raw materials used in the preparation of the hot melt adhesive for book binding are the same as those in Application Example 1, calculated by weight percentage.

[0121] The specific steps of the method for preparing the hot melt adhesive for book binding are the same as those in Application Example 1.

[0122] Based on the calculation of 8 batches per day (each batch operating continuously for 2 hours) and an interval of 1-1.5 seconds between each adjacent batch, the following table shows the time required to treat the fouling of the pipeline 1 of the EVA hot melt adhesive production system with an atomizing device and the EVA hot melt adhesive production system without an atomizing device in the preparation process of the hot melt adhesive for book binding in the above-mentioned application examples 1-12 and the application comparison example, as well as the time from the start of bagging to the start of hardening of the EVA hot melt particles:

[0123] Number of atomizing nozzles Installation angle of atomizing nozzle (°) Installation depth of atomizing nozzle (cm) Time required for fouling treatment (days) Time from bagging to hardening (days) Application Example 1 1 60 2.0 150 120 Application Comparative Example 0 / / 90 30 Application Example 2 1 30 2.0 120 100 Application Example 3 1 45 2.0 160 145 Application Example 4 1 80 2.0 152 125 Application Example 5 1 90 2.0 147 118 Application Example 6 1 60 -0.5 120 100 Application Example 7 1 60 0 128 116 Application Example 8 1 60 1.0 142 135 Application Example 9 1 60 3.0 175 150 Application Example 10 1 60 3.5 148 138 Application Example 11 1 60 4.0 135 128 Application Example 12 1 45 3.0 180 177

[0124] In the above table, from the comparison of the data of Application Example 1 and the Application Control Example, it can be seen that the use of the atomizing device of the present application, that is, the EVA hot melt adhesive production system with an atomizing device, relative to the EVA hot melt adhesive production system without an atomizing device, makes the time required to clean the scale of pipeline I relatively extended by 0.67 times. At the same time, the time from the start of stacking to the start of hardening in the storage process of the hot melt adhesive particles for book binding is relatively extended by 3.00 times.

[0125] By comparing the data of Application Examples 1-5 and the Application Control Example in the above table, it can be seen that in the EVA hot melt adhesive production system with an atomizing device, when the longest length of the atomizing needle of the atomizing nozzle 4 extending into the pipe I and protruding from the inner wall of the pipe I is consistent, that is, 2.0 cm, the installation angle of the atomizing nozzle 4 in the atomizing device on the pipe I, according to the angle between the center line of the atomizing nozzle body of the atomizing nozzle 4 and the material flow direction in the pipe I, is 45-80°. Compared with the EVA hot melt adhesive production system without an atomizing device in the Application Control Example, the time required for cleaning the fouling of the pipe I and the time from the start of palletizing to the start of hardening during the storage process of the hot melt adhesive particles for book binding are relatively extended. The time required for cleaning the fouling of the pipe I is relatively extended by 0.69-0.77 times, and the time from the start of palletizing to the start of hardening during the storage process of the hot melt adhesive particles for book binding is relatively extended by 3.17-3.83 times. The reason for this may be that the entire cross-section of the installed pipe 1 is covered with the atomized additive, and the resulting hot melt adhesive particles for book binding are more likely to be completely adhered to the additive when entering this area, thus achieving better results.

[0126] In particular, in the application example 3, the EVA hot melt adhesive particle production system with an atomizing device has an angle of 45° between the center line of the atomizing nozzle body of the atomizing nozzle 4 and the material flow direction in the pipeline I. Compared with the EVA hot melt adhesive production system of the application control example which does not adopt an atomizing device, the time required for cleaning the fouling in the pipeline I and the time from the start of stacking to the start of hardening during the storage process of the hot melt adhesive particles for book binding are relatively extended the most, so that the time required for cleaning the fouling in the pipeline I is relatively extended by 0.77 times, and the time from the start of stacking to the start of hardening during the storage process of the hot melt adhesive particles for book binding is relatively extended by 3.83 times.

[0127] From the comparison of the data of Application Example 1, Application Examples 6-11 and the Application Control Example in the above table, it can be seen that in the EVA hot melt adhesive production system with an atomizing device, when the angle between the center line of the atomizing nozzle body of the atomizing nozzle 4 and the direction of the material flow in the pipe 1 is consistent, that is, both are 60°, the maximum length of the atomizing needle of the atomizing nozzle 4 extending into the pipe 1 and protruding from the inner wall of the pipe 1 is 2-3 cm. Compared with the EVA hot melt adhesive production system without an atomizing device in the Application Control Example, the time required for cleaning the fouling of the pipe 1 and the time from the start of palletizing to the start of hardening during the storage process of the hot melt adhesive particles for book binding are relatively extended. The time required for cleaning the fouling of the pipe 1 is relatively extended by 0.69-0.94 times, and the time from the start of palletizing to the start of hardening during the storage process of the hot melt adhesive particles for book binding is relatively extended by 3.00-4.00 times.

[0128] In particular, in application example 9, in the EVA hot melt adhesive particle production system with an atomizing device, when the maximum length of the atomizing needle of the atomizing nozzle 4 extending into the pipe I and protruding from the inner wall of the pipe I is 3 cm, compared with the EVA hot melt adhesive production system without an atomizing device, the time required for cleaning the scale of the pipe I and the time from the start of stacking to the start of hardening during the storage process of the hot melt adhesive particles for book binding are relatively extended the most, so that the time required for cleaning the scale of the pipe I is relatively extended by 0.94 times, and the time from the start of stacking to the start of hardening during the storage process of the hot melt adhesive particles for book binding is relatively extended by 4.00 times.

[0129] By comparing the data of Application Example 9, Application Example 12 and the Application Control Example, it can be seen that in the EVA hot melt adhesive production system with an atomizing device, when the angle between the center line of the atomizing nozzle body of the optimized atomizing nozzle 4 and the material flow direction in the pipeline I is 45°, and the maximum length of the atomizing needle of the atomizing nozzle 4 extending into the pipeline I and protruding from the inner wall of the pipeline I is 3 cm, relative to the EVA hot melt adhesive production system without an atomizing device, the time required to clean the scale of the pipeline I is relatively extended by 1.00 times, and the time from the start of stacking to the start of compaction in the storage process of the hot melt adhesive particles for book binding is relatively extended by 4.90 times.

[0130] To sum up, the EVA hot melt adhesive production system with an atomization device in the present application improves the technical problem of pipeline scaling in the original EVA hot melt adhesive production system, relatively reduces production costs, improves production efficiency, and at the same time solves the technical problem of poor anti-caking effect of EVA hot melt adhesive particles produced by the original EVA hot melt adhesive production system, and can effectively improve the anti-caking effect of EVA hot melt adhesive particles.

[0131] The specific embodiments of this application are merely explanations of this application and are not limitations of this application. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments of this application as needed, but as long as they are within the scope of the claims of this application, they are protected by patent law.

Claims

1. An atomizing device, characterized in that The atomizing device includes an additive solution storage tank, a metering pump, a valve FV and an atomizing nozzle. The atomizing nozzle includes an atomizing nozzle body and an atomizing needle. The atomizing nozzle body is provided with a liquid inlet, an air inlet and a liquid outlet. The atomizing needle is provided at the front end of the atomizing nozzle body and directly facing the liquid outlet of the atomizing nozzle body. A discharge pipe is provided in the auxiliary solution storage tank in the atomizing device. The inlet of the discharge pipe is 5-8 mm away from the bottom of the auxiliary solution storage tank. The outlet of the discharge pipe is connected to the liquid inlet of the atomizing nozzle body through a metering pump and a valve FV in sequence. The air inlet of the atomizing nozzle body is connected to the compressed air input pipe. The valve FV is a one-way valve.

2. The atomizing device according to claim 1, characterized in that The atomizing nozzle is model SK508 and is produced by Dongguan Hengxin Spray Technology Co., Ltd. The inner diameter of the liquid nozzle of the atomizing nozzle body of the atomizing nozzle is 3 mm, and the inner diameters of the liquid inlet and air inlet of the atomizing nozzle body are both 10 mm.

3. An EVA hot melt adhesive production system with an atomizing device as claimed in claim 1 or 2, characterized in that The dehydrator and the vibrating screen are connected by a pipe 1, which is divided into a horizontal section and a vertical section. The horizontal section of the pipe 1 after exiting the dehydrator is inclined downward by 30-45 degrees. The length of the horizontal section of the pipe 1 is 1.0-1.2 meters. The outlet of the vertical section of the pipe 1 is perpendicular to the material inlet of the vibrating screen. The atomizing nozzle is installed in the transverse section of the pipeline I and on the upper half of the cross section of the pipeline I at a distance of 0.8-0.9m from the material outlet of the dehydrator; The connection mode between the atomizing nozzle and the pipe 1 is threaded connection or flange connection; The installation angle of the atomizing nozzle is 30-90° between the center line of the atomizing nozzle body and the direction of material flow in the pipeline I; The installation depth of the atomizing nozzle is 0.5-4.0 cm according to the length of the atomizing needle of the atomizing nozzle extending into the inner wall of the pipe 1 and protruding from the inner wall; The ratio of the inner diameter of the liquid nozzle of the atomizing nozzle to the inner diameter of the pipeline I is 3:

100.

4. The EVA hot melt adhesive production system with an atomizing device according to claim 3, characterized in that The atomizing nozzle is installed in the transverse section of the pipeline I, at the midpoint of the upper half of the cross section of the pipeline I, which is 0.9 m away from the material outlet of the dehydrator.

5. The EVA hot melt adhesive production system with an atomizing device according to claim 4, characterized in that The installation angle of the atomizing nozzle on the pipeline I is 45-80° according to the angle between the center line of the atomizing nozzle body of the atomizing nozzle and the direction of material flow in the pipeline I.

6. The EVA hot melt adhesive production system with an atomizing device according to claim 5, characterized in that The installation angle of the atomizing nozzle on the pipeline I is 45° between the center line of the atomizing nozzle body of the atomizing nozzle and the direction of material flow in the pipeline I.

7. The EVA hot melt adhesive production system with an atomizing device according to claim 5, characterized in that The installation depth of the atomizing nozzle on the pipe 1 is 2-3 cm according to the length of the atomizing needle of the atomizing nozzle extending into the inner wall of the pipe 1 and protruding from the inner wall.

8. The EVA hot melt adhesive production system with an atomizing device according to claim 7, characterized in that The installation depth of the atomizing nozzle on the pipe 1 is 3 cm, which is the length by which the atomizing needle of the atomizing nozzle extends into the inner wall of the pipe 1 and protrudes from the inner wall.

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