Production method and production system of TPE / TPR eraser

Abstract

The invention discloses a production method and a production system of a TPE / TPR eraser. The production method comprises the following steps: feeding a TPE / TPR raw material into a screw extruder to extrude a material body; transferring the material body into an electrostatic eliminating device to eliminate surface static electricity to obtain a to-be-cooled material body; the to-be-cooled material body passes through a multi-stage water cooling interval to be cooled for the first cooling time t1; the to-be-cooled material bodies continue to pass through the air cooling intervals to be cooled for the second cooling time t2, and formed material bodies are obtained; the formed material body is conveyed into a material cutting treatment device through a traction device, and the TPE / TPR eraser is output; wherein t1 + t2 is smaller than or equal to 2.5 min, t1 + t2 is smaller than or equal to 2.0 min, or t1 + t2 is smaller than or equal to 1.5 min. The purposes of improving the cooling efficiency, fully cooling the interior of the eraser and reducing the machine energy consumption and the occupied area can be achieved.

Description

Technical Field

[0001] This patent relates to the field of eraser production and processing technology, and in particular to a TPE / TPR eraser production method and production system. Background Art

[0002] In traditional TPE / TPR eraser extrusion production, insufficient cooling equipment efficiency leads to product problems such as dirty appearance, deformation, and large dimensional fluctuations, with a defective rate as high as 15%.

[0003] Existing solutions, such as adding expensive formula additives, can improve the cooling effect, but will reduce the eraser's erasability and wiping power.

[0004] Although a water-cooling tank can improve the cooling effect, it cannot fully cool the inside of the eraser. The heat inside the eraser will be transferred to the surface, resulting in an increased surface dirtiness. For example, in Chinese patent document CN215242786U, a water collecting tank is used for cooling. The cold water in the water collecting tank exchanges heat with the strip of eraser to achieve cooling. In addition, a fan is used to dry the strip of eraser to prevent it from getting too wet. However, relying solely on the water collecting tank for heat exchange is not efficient enough. The internal temperature of the eraser is easily transferred to the surface again in subsequent steps, resulting in a high surface dirtiness.

[0005] Some existing technologies also provide solutions for replacing large cooling equipment, such as dry ice spray in Chinese patent document CN212603299U or compressor refrigeration in Chinese patent document CN212603314U, but they suffer from the disadvantages of high energy consumption and large floor space. The above problems limit the improvement of production efficiency and product quality. There is an urgent need for an improved process that takes into account both cost and performance. Summary of the Invention

[0006] The purpose of this patent is to provide a TPE / TPR eraser production method and production system, so as to achieve the purpose of improving cooling efficiency, fully cooling the inside of the eraser, and reducing machine energy consumption and floor space.

[0007] In order to solve the above technical problems, this patent adopts the following technical solutions:

[0008] A TPE / TPR eraser production method comprises the following steps:

[0009] Step A: Put TPE / TPR raw materials into a screw extruder to extrude the material body;

[0010] Step B: transferring the material to an anti-static device to eliminate surface static electricity to obtain a material to be cooled;

[0011] Step C1: passing the material to be cooled through multiple water cooling zones for a first cooling time t1;

[0012] Step C2: continuing to cool the material body through the air cooling zone for a second cooling time t2 to obtain a molded material body;

[0013] Step D: transporting the formed material body to the cutting processing device through the traction device to output the TPE / TPR eraser;

[0014] Among them, t1+t2≤2.5min, t1+t2≤2.0min or t1+t2≤1.5min.

[0015] Furthermore, the t1 time is 0.8-0.9 min, 0.9-1.0 min, 1.0-1.1 min, 1.1-1.2 min or 1.2-1.5 min.

[0016] Furthermore, the t2 time is 0.5-0.6 min, 0.6-0.7 min or 0.7-0.8 min. In the actual production process, the ratio of t1 to t2 can be adjusted according to (1:1) to (2:1) or (2:1) to (3:1) according to product requirements.

[0017] Furthermore, in step C1, low-temperature circulating water is used for cooling in the multi-stage water cooling zone, and the water temperature is controlled at 10-15°C or 15-20°C;

[0018] In step C2, the wind speed in the air cooling zone is 1-2 m / s, 2-3 m / s, or 3-4 m / s.

[0019] Furthermore, in step D, the surface dirtiness rate of the TPE / TPR eraser is less than or equal to 0.5%.

[0020] Furthermore, in step A, the extrusion temperature of the screw extruder is 70-80°C, 80-90°C, 90-100°C, 100-110°C or 110-120°C;

[0021] In step B, the static electricity removal device removes static electricity for less than or equal to 3 seconds, thereby reducing the surface static electricity voltage from 5000V to less than or equal to 4600V;

[0022] In step D, the cutting processing device includes an automatic cutting machine, a plasma processing machine and a blast drying box.

[0023] The drying temperature of the blast drying box is 50-55℃, 55-60℃, 60-65℃ or 65-70℃.

[0024] The plasma power of the plasma processor is 200-220W;

[0025] The processing time of the plasma processor is 2 to 3 seconds;

[0026] The processing distance between the plasma treatment machine and the molding material body is 1-3 mm, 3-5 mm, 5-7 mm, 7-8 mm or 8-9 mm.

[0027] This patent further provides a production system for the TPE / TPR eraser production method using any of the above methods, the production system includes a screw extruder, a static elimination device, a cooling device, a traction device and a cutting processing device.

[0028] The cooling device includes a multi-stage water cooling structure and an air cooling structure, the multi-stage water cooling structure is arranged in the multi-stage water cooling zone, and the air cooling structure is arranged in the air cooling zone;

[0029] The screw extruder is connected to the static removal device and the cooling device through a conveyor.

[0030] The cooling device is connected to the cutting material processing device through a traction device;

[0031] The cooling device includes a multi-stage water cooling structure and an air cooling structure.

[0032] The multi-stage water cooling structure is connected to the screw extruder, and the air cooling structure is connected to the traction device.

[0033] Furthermore, the multi-stage water cooling structure includes a U-shaped fixed wheel and a water tank.

[0034] The U-shaped fixed wheel is arranged on the conveying device, so that the conveying device transports the material to be cooled in the water tank along a U-shaped curve path around the U-shaped fixed wheel.

[0035] Furthermore, the U-shaped fixed wheel includes an upper fixed wheel and a lower fixed wheel;

[0036] The conveying device transports the material to be cooled in the water tank in a U-shaped curve and sequentially around the lower fixed wheel and the upper fixed wheel, thereby forming a three-level water cooling structure.

[0037] Furthermore, the U-shaped fixed wheel is made of wear-resistant silicone;

[0038] The wheel groove depth of the U-shaped fixed wheel is 3-4mm, 4-5mm, 5-6mm, 6-7mm or 7-8mm;

[0039] The surface roughness of the U-shaped fixed wheel is less than or equal to 0.8 μm.

[0040] Furthermore, the production system also includes an infrared sensor, which is located between the upper fixed wheel and the traction device.

[0041] Furthermore, the cutting and processing device includes an automatic cutting machine, a plasma processing machine, a pad printing machine, an air drying box and an automatic roll wrapping film machine;

[0042] The traction device is connected in sequence to the automatic cutting machine, plasma processing machine, pad printing machine, air drying box and automatic roll wrapping film machine.

[0043] This patent provides a TPE / TPR eraser production method and production system. By optimizing equipment configuration and quantifying process parameters, it solves the problems of low cooling efficiency and poor product consistency in traditional production, achieving efficient, environmentally friendly, and high-yield industrial production. This patent shortens the cooling time of the material to be cooled, improving production efficiency. Through the cooperation of a two-stage cooling system, the molded material is fully cooled, and the internal temperature and surface temperature are well consistent. This prevents internal heat from being transferred to the surface of the molded material during the subsequent production process and absorbing more dust under the action of the heat. As a result, the surface dirtiness rate of the TPE / TPR erasers of this patent is reduced to ≤0.5%, and the appearance qualification rate is increased to over 99.5%. In addition, the energy consumption of this patent is reduced by 20-30% (calculated in terms of power consumption per hour) compared to traditional chillers, the floor space is reduced by 40%, and the cooling efficiency is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above content of this patent and the following specific embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the technical solutions claimed.

[0045] Figure 1 It is a schematic diagram of the process of producing TPE / TPR eraser in this patent;

[0046] Figure 2 It is a schematic diagram of the structure of the production system in this patent;

[0047] Figure 3 yes Figure 2 Schematic diagram of the coordination between the single screw extruder and the cooling device;

[0048] Figure 4 yes Figure 2 Schematic diagram of the structure of the cooling device;

[0049] Figure 5 yes Figure 2 Schematic diagram of the structure of the medium-cut material processing device.

[0050] The description of the accompanying drawings is as follows:

[0051] Single screw extruder: 10

[0052] Support frame: 20

[0053] Anti-static device: 30

[0054] Infrared sensor: 40

[0055] Cooling device: 50

[0056] Multi-stage water cooling structure: 51

[0057] Water cooling structure on the material to be cooled: 511

[0058] Water cooling structure in the material to be cooled: 512

[0059] Water cooling structure under the material to be cooled: 513

[0060] U-shaped fixed wheel: 52

[0061] Upper fixed wheel: 521

[0062] Lower fixed wheel: 522

[0063] Air cooling structure: 53

[0064] Traction device: 60

[0065] Cutting material processing device: 70

[0066] Automatic cutting machine: 71

[0067] Plasma treatment machine: 72

[0068] Pad printer: 73

[0069] Blast drying oven: 74

[0070] Automatic roll wrapping machine: 75

[0071] Teleporter: 80 DETAILED DESCRIPTION

[0072] The detailed features and advantages of this patent are described in detail below in the specific implementation method. The content is sufficient to enable any technical personnel in this field to understand the technical content of this patent and implement it accordingly. Based on the description, claims and drawings disclosed in this specification, technical personnel in this field can easily understand the relevant purposes and advantages of this patent.

[0073] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0074] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product is usually placed when in use. These are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this patent.

[0075] All other terms used herein that are not specifically defined in this patent are intended to have the general meanings understood by those of ordinary skill in the art, particularly the meanings by which those of ordinary skill in the art can directly and unambiguously determine how to implement the technical solutions of this patent after reading the claims, specification, and drawings of this patent. Those of ordinary skill in the art will first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, they will choose to refer to the relevant definitions in other documents published by the applicant before the filing date to reasonably interpret the terms; thirdly, they will choose to refer to the references cited in this patent to reasonably interpret the terms; and finally, they will choose to combine the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc. commonly used by those of ordinary skill in the art to reasonably interpret the terms.

[0076] The entire contents of all references cited in this application are incorporated into this specification by reference to the extent that they do not conflict with the contents disclosed in this application. It is obvious to those skilled in the art that products (devices, elements, equipment, compounds, compositions, materials, etc.) and methods (processes, steps, conditions, parameters, equipment and test methods, equipment, etc.) other than those specifically described in this specification can be applied to the implementation of the patent fully disclosed in this specification without resorting to excessive experimentation. This patent intends to cover all functional equivalents known in the art of the methods, devices, equipment elements, materials, processes and technologies specifically described in this specification. All references cited include:

[0077] Marks' Standard Handbook for Mechanical Engineers, compiled by Marks et al. and published by McGraw-Hill, Inc. (11th edition and other versions before the filing date of this application); DeGarmo's Materials and Processes in Manufacturing, compiled by DeGarmo et al. and published by Wiley (13th edition and other versions before the filing date of this application); Machinery's Handbook, compiled by Oberg et al. and published by Industrial Press Inc. (32nd edition and other versions before the filing date of this application); Mechanical Design Handbook, edited by Cheng Daxian and published by Chemical Industry Press (6th edition and other versions before the filing date of this application); Modern Mechanical Design Handbook, edited by Wen Bangchun and published by Machinery Industry Press (6th edition and other versions before the filing date of this application).

[0078] In order to make the purpose, technical solutions and advantages of this patent clearer, the implementation methods of this patent will be further described in detail below with reference to the accompanying drawings.

[0079] like Figure 1 Shown is a TPE / TPR eraser production method provided by this patent, comprising the following steps:

[0080] Step A: Put TPE / TPR raw materials into a screw extruder to extrude the material body;

[0081] Step B: transferring the material to an anti-static device to eliminate surface static electricity to obtain a material to be cooled;

[0082] Step C1: passing the material to be cooled through multiple water cooling zones for a first cooling time t1;

[0083] Step C2: continuing to cool the material body through the air cooling zone for a second cooling time t2 to obtain a molded material body;

[0084] Step D: transporting the formed material body to the cutting processing device through the traction device to output the TPE / TPR eraser;

[0085] Among them, t1+t2≤2.5min, t1+t2≤2.0min or t1+t2≤1.5min.

[0086] Among them, the t1 time is 0.8-0.9min, 0.9-1.0min, 1.0-1.1min, 1.1-1.2min or 1.2-1.5min; the t2 time is 0.5-0.6min, 0.6-0.7min or 0.7-0.8min. In the actual production process, the ratio of t1 to t2 can be adjusted according to (1:1) to (2:1) or (2:1) to (3:1) according to product requirements.

[0087] like Figures 2 to 5 As shown, this patent further provides a production system using the above-mentioned TPE / TPR eraser production method, the production system includes a screw extruder, a static elimination device 30, a cooling device 50, a traction device 60 and a cutting processing device 70,

[0088] The cooling device 50 includes a multi-stage water cooling structure 51 and an air cooling structure 53. The multi-stage water cooling structure is arranged in the multi-stage water cooling zone, and the air cooling structure is arranged in the air cooling zone.

[0089] The screw extruder is connected to the static elimination device 30 and the cooling device 50 via the conveying device 80.

[0090] The cooling device 50 is connected to the cutting material processing device 70 via the traction device 60;

[0091] The cooling device 50 includes a multi-stage water cooling structure 51 and an air cooling structure 53.

[0092] The multi-stage water cooling structure 51 is connected to the screw extruder, and the air cooling structure 53 is connected to the traction device 60 .

[0093] The screw extruder can be a single screw extruder 10 , the cooling device 50 is installed on the support frame 20 , and the cutting processing device 70 includes an automatic cutting machine 71 , a plasma processing machine 72 , a pad printing machine 73 , an air drying box 74 and an automatic roll wrapping film machine 75 .

[0094] This patent includes the following sequentially connected equipment: single-screw extruder 10 → support frame 20 → static electricity removal device 30 → infrared sensor 40 → multi-stage water cooling structure 51 → U-shaped fixed wheel 52 → air cooling structure 53 → traction device 60 → automatic cutting machine 71 → plasma processing machine 72 → pad printing machine 73 → air drying box 74 → automatic roll wrapping film machine 75.

[0095] The setting parameters of the single-screw extruder 10 are: extrusion temperature: 80-120℃ segmented heating, wherein the extrusion temperature of the single-screw extruder 10 has a total of 5 sections, the first feeding section temperature is 80-85℃, the second compression section is 90-95℃, the third melting section is 96-105℃, the fourth metering section is 108-112℃, and the fifth head section is 90-95℃ to ensure uniform plasticization.

[0096] The static elimination device 30 can utilize an ion wind static eliminator with a DC5kV operating voltage and a static elimination time of ≤3 seconds, reducing the surface static voltage from 5000V to ≤4600V. This patent reduces dust adsorption by over 90%, improving product cleanliness to 98% and reducing residual scrap by 85%, reducing subsequent cleaning process costs.

[0097] This patent further solves the problem of material chip adsorption and bending deformation by cooperating with the static electricity removal device 30 and the U-shaped fixed wheel 52, and the surface dirtiness rate is reduced from 8% to ≤0.5%.

[0098] This patent utilizes a two-stage cooling system: the first stage utilizes low-temperature circulating water cooling, a multi-stage water cooling structure 51, to cool the material to be cooled, with the water temperature controlled at 15±2°C. The second stage utilizes an air cooling structure 53 for forced air cooling at a temperature of 10-15°C and a wind speed of 2-3 m / s, reducing the temperature of the molded material to room temperature to produce a TPE / TPR eraser. This patent shortens the cooling time of the material to 1.5 minutes, improving production efficiency by 30%. It also reduces the dimensional fluctuation of the TPE / TPR eraser to ≤1%, significantly improving product consistency. The two-stage cooling system ensures sufficient cooling of the molded material, ensuring good consistency between the internal and surface temperatures. This prevents internal heat from being transferred to the molded material surface during subsequent production processes, where it would attract more dust. As a result, the surface contamination rate of the TPE / TPR eraser produced by this patent is reduced to ≤0.5%, and the appearance qualification rate is increased to over 99.5%. In addition, the energy consumption of this patent is reduced by 20-30% (calculated in terms of power consumption per hour) compared to the traditional single-tank chiller (water temperature is 8-11°C), the floor space is reduced by 40%, and the cooling efficiency is significantly improved.

[0099] The U-shaped fixed wheel 52 adopts an upper and lower double-layer wheel design, specifically an upper fixed wheel 521 and a lower fixed wheel 522. The conveying device 80 transports the material to be cooled around the upper fixed wheel 521 and the lower fixed wheel 522 respectively, and forms two side U-shaped curve paths of the conveying device 80 in the water tank, thereby forming a water-cooling structure 511 on the material to be cooled, a water-cooling structure 512 in the middle of the material to be cooled, and a water-cooling structure 513 under the material to be cooled.

[0100] The wheel diameter of the upper fixed wheel 521 and the lower fixed wheel 522 is Φ50-150 mm, the wheel groove depth is 3-8 mm, the material is wear-resistant silicone, the surface roughness Ra≤0.8 μm, and the product deformation rate is reduced from 8-10% in the traditional single-tank chiller process to ≤1.3%; the bending deformation rate of the TPE / TPR eraser during the traction process can be controlled to ≤0.3%, the dimensional stability (such as thickness tolerance) is controlled within 54*20*11±0.1mm, the dimensional stability is ≤2%, and the equipment usage area is reduced by 100%.

[0101] Plasma processor parameters: plasma power 200-220W, treatment time 2-3 seconds, treatment distance 1-8mm. The peel strength of printed patterns on molded materials has been increased from 1.0N / 25mm (tested according to GB / T 2792) to 2.5N / 25mm (tested according to GB / T 2792). The peel rate has been reduced from 15% to ≤1% (tested according to GB / T 2792) using the traditional process (testing the product surface with a 100-grid knife and then reattaching the printed pattern or text three times with 3M tape to see if it falls off), improving print fastness. The ink adhesion level has been increased from level 3 (slight peeling) to level 5 (no peeling at all). This improved ink adhesion has also reduced the print defect rate from 5% to ≤0.2%.

[0102] Blast drying oven drying parameters: temperature set at 60±5°C, wind speed 1.5-2.5m / s, drying time 0.5-1.2 minutes. Results: Surface moisture residue ≤ 0.1%, preventing sticking issues with subsequent printing; drying energy consumption is reduced by 15% compared to traditional ovens (through optimized hot air circulation).

[0103] Traction speed matching for the traction device: Dynamic adjustment based on feedback from the infrared sensor (i.e., infrared sensor 40) improves efficiency by 30%. This dynamic adjustment of the traction device is essentially a closed-loop control system. Infrared sensors collect real-time signals about material position, spacing, or motion. After comparing these signals with preset parameters, the controller outputs adjustment commands to the actuator (e.g., motor) to achieve real-time optimization of the traction speed.

[0104] The calculation formula of traction speed is as follows:

[0105]

[0106] Where v is the traction speed of the traction device, v0 is the initial traction speed (reference value); k is the proportional coefficient (usually 0<k≤1, which needs to be determined through experiments; the larger k is, the higher the adjustment sensitivity); (t0-t) / t0 is the feedback deviation rate, which reflects the degree of deviation between the current passing time and the target value.

[0107] In addition, this patent can also be set up with scrap recycling, that is, a closed-loop recycling system, which requires adding a fully automatic selection and detection equipment signal linkage conveyor belt to the crusher. After crushing, the scraps and new materials are mixed by the suction mixing equipment in a weight ratio of 1:3 and added to the feeding hopper of the single-screw extruder 10. Among them, the mixing ratio of scraps is ≤20%, and the weight ratio of new materials is 80%: the weight ratio of recycled and crushed scraps is 20%, and the weight ratio of scraps and new materials is 1:4. The difference in mechanical properties of the obtained TPE / TPR eraser is ≤5%, and the performance is shown in Table 1.

[0108] Table 1: TPE / TPR eraser performance obtained by closed-loop recycling system

[0109] Test items Pure raw materials Add recycled material 1:4 Hardness / HA 45A 46 Tensile strength / Mpa 1.2 1.15 Elongation at break / % 180 175 Tear strength / Mpa 7.5 7.42

[0110] The production system of the TPE / TPR eraser production method provided by this patent has the following advantages:

[0111] Production efficiency: increased from 100kg / h to 130kg / h, and overall costs reduced by 15%.

[0112] Quality improvement: The defective rate of TPE / TPR erasers has been reduced to ≤3%, the dimensional deviation is ≤±0.2mm, and the customer complaint rate has dropped by 90%.

[0113] Environmental benefits: TPE / TPR eraser scraps are 100% recycled, reducing material waste.

[0114] Environmental performance: TPE / TPR material formula complies with ROHS and REACH environmental standards, and the word elimination rate is ≥95% (tested according to ISO11543 standard).

[0115] Feel and wiping force: Shore hardness (A) is controlled at 45±3, friction coefficient ≤0.3, and wiping force is increased by 10-15% (achieved through the synergy of formula fine-tuning and process optimization).

[0116] Example 1

[0117] TPE / TPR eraser raw material formula: SEBS 16 parts, white oil 20 parts, silicone oil 0.5 parts, POE 4 parts, maleic anhydride grafted SEBS 3 parts, PE wax 1 part; calcium carbonate 55 parts, antioxidant 0.1 parts, lubricant 0.5 parts.

[0118] The TPE / TPR raw material is put into a screw extruder to extrude a material body, and the material body is transferred to an anti-static device to eliminate surface static electricity to obtain a material body to be cooled. The material body to be cooled is passed through a multi-stage water cooling zone for a first cooling time t1, and the t1 time is 1.0 min. The material body to be cooled is further passed through an air cooling zone for cooling for a second cooling time t2, and the t2 time is 0.5 min to obtain a molded material body; the molded material body is transported to a cutting processing device through a traction device to output a TPE / TPR eraser.

[0119] This embodiment includes the following sequentially connected equipment: single-screw extruder 10 → support frame 20 → static electricity removal device 30 → infrared sensor 40 → multi-stage water cooling structure 51 → U-shaped fixed wheel 52 → air cooling structure 53 → traction device 60 → automatic cutting machine 71 → plasma processing machine 72 → pad printing machine 73 → air drying box 74 → automatic roll wrapping film machine 75.

[0120] The setting parameters of the single-screw extruder 10 are: extrusion temperature: 80-120℃ segmented heating, wherein the extrusion temperature of the single-screw extruder 10 is 5 sections in total, the first feeding section temperature is 85℃, the second compression section is 95℃, the third melting section is 100℃, the fourth metering section is 108℃, and the fifth head section is 90℃ to ensure uniform plasticization.

[0121] The static elimination device 30 may adopt an ion wind static eliminator with a working voltage of DC5kV and a static elimination time of ≤3 seconds, which can reduce the surface static voltage from 5000V to ≤4600V.

[0122] The first section of the cooling device 50 adopts low-temperature circulating water cooling as a multi-stage water cooling structure 51. The multi-stage water cooling structure 51 is set in a water tank with a size of 5m*20cm*30cm. The water temperature is controlled at 15°C; the second section adopts an air cooling structure 53 for forced air cooling. The air cooling temperature is 10-12°C and the wind speed is 2m / s. The temperature of the molded material body is reduced to room temperature to obtain a TPE / TPR eraser.

[0123] The conveyor 80 transports the material to be cooled around the upper fixed wheel 521 and the lower fixed wheel 522, forming two U-shaped paths within the water tank, thereby forming the upper water-cooling structure 511, the middle water-cooling structure 512, and the lower water-cooling structure 513. The upper and lower fixed wheels 521 and 522 have a diameter of 100 mm and a groove depth of 5 mm. They are made of wear-resistant silicone and have a surface roughness Ra of 0.8 μm.

[0124] Traction speed matching of the traction device: The infrared sensor collects the material position, spacing or motion state signal in real time, and after comparing it with the preset parameters, the controller outputs the adjustment command to the actuator (such as the motor) to achieve real-time optimization of the traction speed.

[0125] Automatic cutting machine parameters are as follows:

[0126] Power supply: 220V 50 / 60HZ;

[0127] Rated power: 2.5KW;

[0128] Cutting width: 1~160mm, thickness and width are customized according to product size;

[0129] Cutting length: 0.1~9999.9mm;

[0130] Cutting width: 100mm;

[0131] Cutting speed: 3 times / second;

[0132] Weight: 26KG;

[0133] Specifications: Length, width and thickness 60*26*15mm, can be adjusted according to product size;

[0134] Stroke frequency: 90 times / min;

[0135] Error: ±0.03mm.

[0136] The plasma power of the plasma treatment machine is 200W, the treatment time is 2 seconds, and the treatment distance is 5mm.

[0137] The drying condition parameters of the blast drying box are: temperature setting 60℃, wind speed 2.0m / s, and drying time 1.0min.

[0138] The parameters of the drying box machine are set as follows:

[0139] Power supply: 220V / 50Hz;

[0140] Timing range: 0-999 / min;

[0141] Heating power: 5KW;

[0142] Wind speed: 0.5~2.5m / s;

[0143] Blowing mode: forced hot air circulation (horizontal or vertical air supply) to ensure uniform temperature and air flow in the box and speed up drying efficiency;

[0144] Temperature control accuracy: ±0.1℃~±1℃, the temperature control accuracy of the equipment adopts PID intelligent temperature control technology;

[0145] Temperature uniformity: ≤±1℃~±3℃;

[0146] Temperature range: usually room temperature + 5℃ ~ 250℃.

[0147] The parameters of the automatic roll wrapping film machine are as follows:

[0148] Power supply: 380V / 5KW

[0149] Dimensions and weight: 220mm×450mm×260mm, weight 75kg

[0150] Sealing temperature: 10-300℃

[0151] Sealing speed: 7-20pcs / min

[0152] Working air pressure: 0.4-0.7MPa

[0153] Scraps recycling: that is, closed-loop recycling system. The scraps cut off by the automatic cutting machine 71 are conveyed to the crusher through the signal linkage of the fully automatic selection and detection equipment. After crushing, they are mixed by the suction and mixing equipment. The weight of the new material added accounts for 80%: the weight of the recycled and crushed scraps accounts for 20%, and the weight ratio of scraps to new materials is 1:4.

[0154] Comparative Example 1

[0155] The difference from Example 1 is that a single water tank is used and there is no air cooling structure. The water tank size is 5m*20cm*30cm, the cooling water tower circulates water at room temperature, the cooling time is 3 minutes, and production turnover is carried out through infrared traction equipment and cutting tables. The product size fluctuation rate is ≥5%, and the surface dirtiness rate is ≥3%.

[0156] The existing equipment water tank cannot meet the cooling requirements of TPE rubber, the product deformation and bending are ≥30%, and the dimensional consistency is poor ≥12.3%.

[0157] In order to further illustrate the advantages of this patent, the production index test values ​​of Example 1 and Comparative Example 1 are compared below, and the results are shown in Table 2.

[0158] Testing standards: Key performance indicators are tested according to common industry standards (such as ISO, GB, ASTM) to ensure data comparability.

[0159] Cost calculation: Material loss cost is estimated based on the difference between TPE / TPR raw material price (e.g. 13 yuan / kg) and defective rate.

[0160] Energy consumption data: obtained by comparing the actual power consumption of traditional chillers and optimized cooling systems.

[0161] Supported by the above specific data, this technical solution not only solves the cooling problem, but also achieves significant optimization of production efficiency, product quality and cost control, and has industrial application value.

[0162] The above parameters can be further adjusted according to actual production line data to ensure the adaptability and feasibility of the technical solution.

[0163] Table 2: Comparison of production index tests between Example 1 and Comparative Example 1

[0164]

[0165] According to the comparison between Example 1 and Comparative Example 1 in Table 2, it can be seen that this patent has the following advantages:

[0166] Improved overall production efficiency: From 150kg / h of traditional process to 200kg / h, production capacity increased by 33%

[0167] Defective rate and cost: The defective rate was reduced from 5-8% to ≤1%, directly saving about 15% in material loss costs;

[0168] The scrap recycling rate is 100%, further reducing material costs.

[0169] Optimization of site occupancy: By adding upper and lower fixed wheels with U-shaped fixed wheels in the water tank, the existing layout is compacted and the production line footprint is reduced by 66.67%. However, a cooling structure with only a single water tank (no air cooling structure) requires at least 15 meters to meet production index requirements. This patent uses only a 5-meter water tank, and the U-shaped design can reduce the footprint by 10 meters.

[0170] Environmental performance: TPE / TPR material formula complies with ROHS and REACH environmental standards, and the word elimination rate is ≥95% (tested according to ISO11543 standard).

[0171] Feel and wiping force: Shore hardness (A) is controlled at 45±3, friction coefficient ≤0.3, and wiping force is increased by 10-15% (achieved through the synergy of formula fine-tuning and process optimization).

[0172] The terms and expressions used herein are for descriptive purposes only, and this patent should not be limited to these terms and expressions. The use of these terms and expressions does not exclude any equivalent features of the illustrations and descriptions (or portions thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions are also possible. Accordingly, the claims should be deemed to cover all such equivalents.

[0173] Similarly, it should be pointed out that although this patent has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate this patent, and various equivalent changes or substitutions can be made without departing from the spirit of this patent. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of this patent, they will fall within the scope of the claims of this patent.

Claims

1. A TPE / TPR eraser production method, characterized in that, The following steps are involved: Step A: Put TPE / TPR raw materials into a screw extruder to extrude the material body; Step B: transferring the material body to an anti-static device to eliminate surface static electricity, thereby obtaining a material body to be cooled; Step C1: passing the material to be cooled through multiple water cooling zones for a first cooling time t1; Step C2: continuing to cool the material body to be cooled in the air cooling zone for a second cooling time t2 to obtain a molded material body; Step D: transporting the molded material body to a cutting processing device via a traction device to output the TPE / TPR eraser; Among them, t1+t2≤2.5min, t1+t2≤2.0min or t1+t2≤1.5min.

2. TPE / TPR eraser production method according to claim 1, is characterized in that, In step C1, low-temperature circulating water is used for cooling in the multi-stage water cooling zone, and the water temperature is controlled at 10-15° C. or 15-20° C.; In step C2, the wind speed in the air cooling zone is 1-2 m / s, 2-3 m / s or 3-4 m / s.

3. TPE / TPR eraser production method according to claim 2, is characterized in that, In the step D, the surface dirtiness rate of the TPE / TPR eraser is less than or equal to 0.5%.

4. TPE / TPR eraser production method according to claim 1, is characterized in that, In the step A, the extrusion temperature of the screw extruder is 70-80°C, 80-90°C, 90-100°C, 100-110°C or 110-120°C; In the step B, the static electricity removal time of the static electricity removal device is less than or equal to 3 seconds, thereby reducing the surface static electricity voltage from 5000V to less than or equal to 4600V; In the step D, the cutting processing device includes an automatic cutting machine, a plasma processing machine and an air drying box. The drying temperature of the blast drying box is 50-55°C, 55-60°C, 60-65°C or 65-70°C. The plasma power of the plasma processing machine is 200-220W; The processing time of the plasma treatment machine is 2 to 3 seconds; The processing distance between the plasma treatment machine and the molding material body is 1-3 mm, 3-5 mm, 5-7 mm, 7-8 mm or 8-9 mm.

5. A production system using the TPE / TPR eraser production method according to any one of claims 1 to 4, characterized in that: The production system includes a screw extruder, a static electricity removal device, a cooling device, a traction device and a cutting material processing device. The cooling device includes a multi-stage water cooling structure and an air cooling structure, wherein the multi-stage water cooling structure is arranged in the multi-stage water cooling zone, and the air cooling structure is arranged in the air cooling zone; The screw extruder is connected to the static removal device and the cooling device via a conveying device. The cooling device is connected to the cutting processing device through the traction device; The cooling device includes a multi-stage water cooling structure and an air cooling structure. The multi-stage water-cooling structure is connected to the screw extruder, and the air-cooling structure is connected to the traction device.

6. The production system according to claim 5, characterized in that The multi-stage water cooling structure includes a U-shaped fixed wheel and a water tank. The U-shaped fixed wheel is arranged on the conveying device, so that the conveying device transports the material to be cooled in the water tank along a U-shaped curve path around the U-shaped fixed wheel.

7. The production system according to claim 6, characterized in that The U-shaped fixed wheel includes an upper fixed wheel and a lower fixed wheel; The conveying device conveys the material to be cooled in the water tank in a U-shaped curve and sequentially around the lower fixed wheel and the upper fixed wheel, thereby forming a three-stage water cooling structure.

8. The production system according to claim 7, characterized in that The U-shaped fixed wheel is made of wear-resistant silicone; The wheel groove depth of the U-shaped fixed wheel is 3-4 mm, 4-5 mm, 5-6 mm, 6-7 mm or 7-8 mm; The surface roughness of the U-shaped fixed wheel is less than or equal to 0.8 μm.

9. The production system according to claim 7, characterized in that The production system further includes an infrared sensor, which is located between the upper fixed wheel and the traction device.

10. The production system according to claim 5, characterized in that The cutting and processing device includes an automatic cutting machine, a plasma processing machine, a pad printing machine, an air drying box and an automatic roll wrapping machine; The traction device is sequentially connected to the automatic cutting machine, the plasma processing machine, the pad printing machine, the air drying box and the automatic roll wrapping machine.

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