A method for recycling the gelatin from soft capsules

Abstract

This invention provides a method for recovering the adhesive layer of soft capsules. The method includes: placing a tightly pressed adhesive layer with two layers of rubber into an environment at 15-25°C and 40-50% humidity for 1-2 hours to cool; pressing the cooled adhesive layer through the gap between symmetrically arranged planar rollers, squeezing out air and grease between the two layers through cut holes left during the capsule shell pressing process under pressure, thus using the flow of air and grease to break apart the adhered double layers of rubber; tearing the double layers of rubber along the joint; and cleaning the grease between the two layers of rubber with a polar solvent to obtain the recovered adhesive layer. This method is simple to operate and easy to implement, effectively removing grease between the double layers of rubber without solvent residue, reducing the adverse effects of grease on subsequent soft capsule preparation, meeting the requirements for gel strength and Blaine viscosity of the adhesive used in soft capsule production, saving enterprise costs, and reducing resource waste and environmental pollution.

Description

Technical Field

[0001] This invention belongs to the field of food and pharmaceutical technology, and specifically includes a method for recovering the reticulum from soft capsules. Background Technology

[0002] Currently, regardless of whether it's pharmaceuticals or health foods, soft capsule production using the compression method has become the mainstream method. Residue is unavoidably generated during soft capsule manufacturing, and its surface contains a certain amount of liquid paraffin oil. The amount of residue generally accounts for more than 40% of the total residue, which is enormous. Directly discarding it would cause environmental pollution and increase production costs for companies. However, if it is not discarded and directly recycled, the residual liquid paraffin oil will affect the sealing and appearance quality of the soft capsules.

[0003] CN101318118A discloses a method for recycling the retinal lining material from waste soft capsules. This method involves directly dissolving the waste retinal lining material, then adding protein powder to the solution. The protein powder's adsorption properties remove impurities such as paraffin from the waste retinal lining material, resulting in a highly transparent and glossy solution for recycling. CN107415090A discloses a method for recycling retinal lining material. This method uses negative pressure to directly separate the paraffin oil and other impurities floating on the upper layer after dissolution, resulting in a highly glossy and impurity-free solution. However, due to the high viscosity of the solution, direct dissolution may not fully expose the liquid paraffin oil, leaving it residue in the solution. This prevents effective removal through subsequent adsorption and separation, leading to reduced solution quality, increased product leakage rate, and other problems. Furthermore, introducing unformulated raw materials or excipients into the final product is not permitted under current pharmaceutical and health food regulations.

[0004] Therefore, there is an urgent need to develop an effective method for removing liquid paraffin oil from waste mesh adhesive in order to achieve the recycling and reuse of waste mesh adhesive. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, the present invention aims to provide a method for recycling the reticulum of soft capsules. This invention effectively removes residual liquid paraffin oil from the reticulum, achieving a more thorough cleaning. Furthermore, the cleaned recycled reticulum can be mixed with new reticulum for soft capsule preparation, resulting in a final product free of any other introduced materials. Under regulatory compliance, this method achieves the goal of reticulum recycling and reuse, saving enterprise costs and reducing resource waste and environmental pollution.

[0006] It should be noted that the mesh adhesive involved in this invention refers to mesh adhesive that does not contain the contents of soft capsules, excluding defective products such as leaked or deflated capsules or mesh adhesive that has been contaminated by the contents of soft capsules. These mesh adhesives all have a structure in which the two layers of rubber are tightly pressed together. The rubber is covered with circular or elliptical holes left by the cutter when pressing the capsule shell. The outline of the holes is the area where the two layers of rubber are pressed together most tightly.

[0007] To achieve the above objectives, the technical solution adopted by the present invention includes:

[0008] This invention discloses a method for recycling waste reticulum from soft capsules, comprising the following steps:

[0009] The mesh with double-layered rubber tightly pressed together is placed in a constant temperature and humidity environment of 15-25℃ and 40-50% to cool for 1-2 hours; cooling in a constant temperature and humidity environment ensures the toughness of the mesh without making it too dry or too soft.

[0010] The cooled rubber is pressed through the gap between symmetrically arranged planar rollers. Under pressure, the air and grease between the two rubber layers are squeezed out from the cut holes left during the pressing process. The flow of air and grease is used to break apart the bonded rubber layers. Then, the two rubber layers are torn apart along the joint, and the grease between the two rubber layers is cleaned with a polar solvent to obtain recycled rubber.

[0011] Because the mesh adhesive is at a high temperature when it first enters the shot blasting machine, the two layers of rubber are sticky and difficult to tear apart. Furthermore, the previous pressing of the shell further compresses the two layers, increasing the difficulty of separation. This invention first utilizes cooling to increase the toughness of the mesh adhesive, thus reducing the adhesion between the two layers. Then, physical extrusion is used to squeeze out the air and grease remaining between the two layers from the holes left during the shell pressing process. During this extrusion, the air and grease flow partially or completely breaks apart the most tightly bonded area. Once broken apart, the two layers can be easily torn apart with external force, fully exposing the grease between them. Then, it can be cleaned with a polar solvent. This method of mesh adhesive recovery thoroughly cleans the grease, resulting in high-quality recovered mesh adhesive, which is beneficial for subsequent reuse.

[0012] Furthermore, the ratio of the gap width between the symmetrically arranged planar rollers to the thickness of the adhesive mesh should be within a suitable range. If the gap is too wide, it will not achieve the purpose of breaking through the adhesion of the double-layer rubber by squeezing air and grease. If the gap is too narrow, the adhesive mesh will be obstructed from passing through the gap of the planar rollers and will damage the adhesive mesh structure. After a large number of experiments, it is advisable to control it to 1:2-1:4. For example, the ratio of the gap width between the symmetrically arranged planar rollers to the thickness of the double-layer waste adhesive mesh can be 1:2, 1:2.5, 1:3, 1:3.5, 1:4, etc.

[0013] Furthermore, the rotational speed of the planar rollers is also crucial to the extrusion effect. If the rotational speed is too high, the effective extrusion time within the limited mesh area will be shortened, which is not conducive to the discharge of air and grease. If the rotational speed is too low, the time cost will increase, but the extrusion effect will not change much. Therefore, the rotational speed of the planar rollers should be controlled at 1-3 revolutions per minute. For example, the rotational speed of the symmetrically arranged planar rollers can be 1 revolution per minute, 2 revolutions per minute, 3 revolutions per minute, etc.

[0014] Furthermore, the grease between the double-layered rubber sheets is typically liquid paraffin oil, which serves a lubricating function. Based on the principle of "like dissolves like," using polar solvents to clean liquid paraffin oil is effective. Ethanol solution, a commonly used processing aid in food and pharmaceuticals, is readily available, evaporates without residue, and does not introduce other substances. The ethanol solution is a 75-95% ethanol solution, such as 75% ethanol, 95% ethanol, etc. Moreover, the waste ethanol solution generated after cleaning the grease can be recycled and reused in a distillation unit, saving costs and avoiding environmental pollution.

[0015] Furthermore, when tearing apart the double-layer rubber, the pressed mesh can be torn apart along the joint surface of the double-layer rubber with the help of a machine. The machine used can be a symmetrically arranged mesh pulling shaft commonly used in this field, and its rotation speed can be 1-3 revolutions per minute.

[0016] Furthermore, the mass ratio of the polar solvent to the adhesive is 1:1 to 1:2.

[0017] To better clean exposed grease, ultrasonic technology can be introduced for degreasing and cleaning. The cavitation effect of ultrasound can be used to maximize the removal of grease, thereby avoiding the problem of insufficient gel strength caused by the softening of the adhesive when it comes into contact with water. For example, polar solvents and adhesive can be added to the ultrasonic environment and ultrasonically treated for 3-5 minutes.

[0018] The recycled adhesive can be crushed before the next dissolution, which helps it dissolve into liquid adhesive during dissolution, reducing dissolution time and thus avoiding the problem of decreased viscosity and freezing power caused by excessive dissolution time.

[0019] Furthermore, the reticulum recycling method also includes using the recycled reticulum to prepare soft capsules.

[0020] Furthermore, the specific steps for preparing soft capsules using recycled mesh adhesive are as follows:

[0021] The recycled glue is mixed with the new glue in proportion during the next glue-making process. After glue-making, a glue solution is obtained, which is then pressed into soft capsules.

[0022] The "new adhesive" mentioned here refers to directly purchased, unused mesh adhesive, distinguishing it from recycled mesh adhesive. The adhesive solution contains 20-40 wt% recycled mesh adhesive, with the remainder being new adhesive. Excessive addition of recycled mesh adhesive can easily lead to insufficient gel strength and low viscosity. Therefore, recycled mesh adhesive is added within the aforementioned limits while ensuring the required adhesive solution viscosity for production, thereby reducing production costs.

[0023] Furthermore, the recycled adhesive accounts for 20-30 wt% of the adhesive solution, with the remainder being new adhesive.

[0024] Beneficial effects of this invention:

[0025] The mesh glue recycling method provided by this invention is simple to operate and easy to implement. It can effectively remove the grease located between the two layers of rubber, thereby cleaning the mesh glue. Furthermore, the recycled mesh glue can be mixed with new rubber to prepare soft capsules, achieving the goal of recycling and reusing waste mesh glue. While ensuring the quality of soft capsules, it saves enterprise costs and reduces resource waste and environmental pollution. Attached Figure Description

[0026] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] Figure 1 The image shows a physical picture of the mesh adhesive to be cleaned in this invention.

[0028] Figure 2 This diagram illustrates the adhesive treatment process in this invention. Figure 2 Figure 'a' is a schematic diagram of pressing the adhesive mesh. Figure 2 Figure b is a schematic diagram of tearing the mesh adhesive along the joint surface of the double-layer rubber.

[0029] Among them, 1 is the mesh adhesive after machine, 2 is the incision bonding area, 3 is the hole, 4 is the flat roller, 5 is the mesh pulling shaft, 6 is the first single layer of rubber, 7 is the second single layer of rubber, and 8 is the mesh adhesive after pressing. Detailed Implementation

[0030] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments and accompanying drawings, further clarifies the invention. It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field. Unless otherwise specified, the raw materials used in the embodiments of the present invention are obtained through conventional commercial channels.

[0032] Example 1

[0033] Collect the mesh adhesive that has just come off the shot press, which has two layers of rubber tightly pressed together; this is called the off-machine mesh adhesive 1. (See below) Figure 1 and Figure 2 Place the mesh adhesive in a cleanroom storage room (temperature 20℃, humidity 40%-50%) and cool for 1-2 hours to enhance its toughness.

[0034] Since the adhesive area 2, which is the cut left during the pressing of the shell, is the most tightly bonded, the cooled mesh adhesive is pressed through the gap between symmetrically arranged planar rollers 4. The width of the gap between the planar rollers is controlled at 1 / 3 of the thickness of the mesh adhesive, and the rotation speed is controlled at 1-3 rpm. Under pressure, the air and grease in the double-layer rubber are squeezed out from the holes 3 left during the pressing of the shell, so that the flow of air and grease can break through the double-layer rubber bonded at the cut, and finally the pressed mesh adhesive 8 is obtained.

[0035] The pressed mesh adhesive is torn apart along the joint surface of the double-layer rubber using the puller shaft 5 to fully expose the grease between the double-layer rubber. The mesh adhesive is then cleaned with 75% ethanol in an ultrasonic cleaner at a mass ratio of 1:1. The ultrasonic cleaner is cleaned for 3-5 minutes. After cleaning, most of the 75% ethanol is wrung out. Then, the two single-layer rubber sheets (including single-layer rubber sheet 1 6 and single-layer rubber sheet 2 7) are laid flat on the screen to drain, thus obtaining the recycled mesh adhesive.

[0036] The recycled mesh adhesive was crushed into 1-2 cm pieces using a crusher. Then, it was added to a dissolving tank at a mass ratio of 3:7 (3 kg of recycled mesh adhesive and 7 kg of new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until both the new and recycled mesh adhesives were completely dissolved, resulting in a glue solution. The solution was then vacuumed at -0.08M for about 1 hour. The glue solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the glue was granulated using a pelletizing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0037] Example 2

[0038] Collect the mesh glue with double rubber layers tightly pressed together after it comes off the shot press, i.e., the off-machine mesh glue. Place the mesh glue in a clean temporary storage room (temperature 20℃, humidity 40%-50%) and cool it for 1-2 hours to enhance the toughness of the mesh glue.

[0039] The cooled rubber is pressed through the gap between symmetrically arranged planar rollers. The gap width of the planar rollers is controlled to be 1 / 3 of the thickness of the rubber, and the rotation speed is controlled to be 1-3 rpm. Under pressure, the air and grease in the double-layer rubber are squeezed out from the holes left in the pressing process. The flow of air and grease breaks through the double-layer rubber that is stuck at the cut, and finally the pressed rubber is obtained.

[0040] The pressed mesh adhesive is torn apart along the joint surface of the double-layer rubber using a screen puller to fully expose the grease between the double-layer rubber. The mesh adhesive is then cleaned with 75% ethanol in an ultrasonic cleaner at a mass ratio of 1:1. The ultrasonic cleaner is cleaned for 3-5 minutes. After cleaning, most of the 75% ethanol is wrung out. Then, the two single-layer rubber sheets are laid flat on the screen tray to drain, thus obtaining the recycled mesh adhesive.

[0041] The recycled mesh adhesive was crushed into 1-2 cm pieces using a crusher. Then, it was added to a dissolving tank at a mass ratio of 2:8 (recycled mesh adhesive: new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until both the new adhesive and recycled mesh adhesive were completely dissolved, resulting in a dissolving solution. The solution was then vacuumed at -0.08M for about 1 hour. The solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the solution was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0042] Example 3

[0043] Collect the mesh glue with double-layer rubber tightly pressed together after it comes off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) to cool for 1-2 hours to enhance the toughness of the mesh glue.

[0044] The cooled rubber is pressed through the gap between symmetrically arranged planar rollers. The gap width of the planar rollers is controlled to be 1 / 3 of the thickness of the rubber, and the rotation speed is controlled to be 1-3 rpm. Under pressure, the air and grease in the double-layer rubber are squeezed out from the holes left in the pressing process. The flow of air and grease breaks through the double-layer rubber that is stuck at the cut, and finally the pressed rubber is obtained.

[0045] The pressed mesh adhesive is torn apart along the joint surface of the double-layer rubber using a screen puller to fully expose the grease between the double-layer rubber. The mesh adhesive is then cleaned with 75% ethanol in an ultrasonic cleaner at a mass ratio of 1:1. The ultrasonic cleaner is cleaned for 3-5 minutes. After cleaning, most of the 75% ethanol is wrung out. Then, the two single-layer rubber sheets are laid flat on the screen tray to drain, thus obtaining the recycled mesh adhesive.

[0046] The recycled mesh adhesive was crushed into small pieces of 1-2 cm using a crusher. Then, it was added to a dissolving tank at a mass ratio of 4:6 (recycled mesh adhesive: new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until the new adhesive and recycled mesh adhesive were completely dissolved, resulting in an adhesive solution. The solution was then vacuumed at -0.08M for about 1 hour. The adhesive solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the solution was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0047] Comparative Example 1

[0048] Collect the mesh glue with double-layer rubber tightly pressed together after it comes off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) to cool for 1-2 hours to enhance the toughness of the mesh glue.

[0049] The retinal lining was crushed into 1-2 cm pieces using a crusher. Then, it was added to a dissolving tank at a mass ratio of retinal lining to new lining of 1:9. The dissolving process was carried out at 70°C and stirred for 1 hour until both the new lining and the retinal lining were completely dissolved to obtain a syrup. The syrup was then vacuumed at -0.08M for about 1 hour. The syrup was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the syrup was saccharified using a saccharification mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0050] Comparative Example 2

[0051] Collect the mesh glue with double-layer rubber tightly pressed together after it comes off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) to cool for 1-2 hours to enhance the toughness of the mesh glue.

[0052] Add water to the cleaning machine (without ultrasonic cleaning) to clean the mesh adhesive, mainly to remove the grease on the surface of the mesh adhesive. The mass ratio of mesh adhesive to water is 1:2. Clean for 3-5 minutes. After cleaning, wring out most of the water and then spread the mesh adhesive evenly on the screen to drain. This yields recycled mesh adhesive.

[0053] The recycled mesh adhesive was crushed into small pieces of 1-2 cm using a crusher. Then, it was added to a dissolving tank at a mass ratio of 1:9 of recycled mesh adhesive to new adhesive. The dissolving process was carried out at 70°C and stirred for 1 hour until the new adhesive and recycled mesh adhesive were completely dissolved, resulting in an adhesive solution. The solution was then vacuumed at -0.08M for about 1 hour. The adhesive solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the solution was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0054] Comparative Example 3

[0055] Collect the mesh glue with double-layer rubber tightly pressed together after it comes off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) to cool for 1-2 hours to enhance the toughness of the mesh glue.

[0056] Use 75% ethanol to clean the screen adhesive (without ultrasonic cleaning). This mainly removes the grease from the surface of the screen adhesive. The mass ratio of screen adhesive to 75% ethanol is 1:1. Clean for 3-5 minutes. After cleaning, wring out most of the 75% ethanol and then spread the screen adhesive evenly on the screen tray to drain. This yields recycled screen adhesive.

[0057] The recycled mesh adhesive was crushed into small pieces of 1-2 cm using a crusher. Then, it was added to a dissolving tank at a mass ratio of 1:9 of recycled mesh adhesive to new adhesive. The dissolving process was carried out at 70°C and stirred for 1 hour until the new adhesive and recycled mesh adhesive were completely dissolved, resulting in an adhesive solution. The solution was then vacuumed at -0.08M for about 1 hour. The adhesive solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the solution was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0058] Comparative Example 4

[0059] Collect the mesh glue with double-layer rubber tightly pressed together after it comes off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) to cool for 1-2 hours to enhance the toughness of the mesh glue.

[0060] Use 75% ethanol to clean the screen adhesive (without ultrasonic cleaning). This mainly removes the grease from the surface of the screen adhesive. The mass ratio of screen adhesive to 75% ethanol is 1:1. Clean for 3-5 minutes. After cleaning, wring out most of the 75% ethanol and then spread the screen adhesive evenly on the screen tray to drain. This yields recycled screen adhesive.

[0061] The recycled mesh adhesive was crushed into 1-2 cm pieces using a crusher. Then, it was added to a dissolving tank at a mass ratio of 2:8 (recycled mesh adhesive: new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until both the new adhesive and recycled mesh adhesive were completely dissolved, resulting in a dissolving liquid. The liquid was then vacuumed at -0.08M for about 1 hour. The dissolving liquid was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the liquid was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 1.

[0062] Comparative Example 5

[0063] Collect the tightly pressed mesh adhesive with double rubber layers that has just come off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) for 1-2 hours to cool.

[0064] The cooled rubber is pressed through the gap between symmetrically arranged planar rollers. The gap width of the planar rollers is controlled to be 1 / 3 of the thickness of the rubber, and the rotation speed is controlled to be 1-3 rpm. Under pressure, the air and grease in the double-layer rubber are squeezed out from the holes left in the pressing process. The flow of air and grease breaks through the double-layer rubber that is stuck at the cut, and finally the pressed rubber is obtained.

[0065] The pressed mesh adhesive is torn apart along the joint surface of the double-layer rubber using a screen puller to fully expose the grease between the double-layer rubber. The mesh adhesive is then cleaned with 75% ethanol in a cleaning machine (without ultrasonic treatment). The mass ratio of mesh adhesive to 75% ethanol is 1:1. The cleaning time is 3-5 minutes. After cleaning, most of the 75% ethanol is wrung out. Then, the two single-layer rubber sheets are laid flat on the screen to drain, thus obtaining the recycled mesh adhesive.

[0066] The recycled mesh adhesive was crushed into 1-2 cm pieces using a crusher. Then, it was added to a dissolving tank at a mass ratio of 3:7 (recycled mesh adhesive: new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until both the new adhesive and recycled mesh adhesive were completely dissolved, resulting in a dissolving liquid. The liquid was then vacuumed at -0.08M for about 1 hour. The dissolving liquid was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the liquid was granulated using a pelletizing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0067] Comparative Example 6

[0068] Collect the tightly pressed mesh adhesive with double rubber layers that has just come off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) for 1-2 hours to cool.

[0069] The cooled rubber is pressed through the gap between symmetrically arranged planar rollers. The gap width of the planar rollers is controlled to be 1 / 3 of the thickness of the rubber, and the rotation speed is controlled to be 1-3 rpm. Under pressure, the air and grease in the double-layer rubber are squeezed out from the holes left in the pressing process. The flow of air and grease breaks through the double-layer rubber that is stuck at the cut, and finally the pressed rubber is obtained.

[0070] The pressed mesh adhesive is torn apart along the joint surface of the double-layer rubber using a screen puller to fully expose the grease between the double-layer rubber. The mesh adhesive is then cleaned with 75% ethanol in a cleaning machine (without ultrasonic treatment). The mass ratio of mesh adhesive to 75% ethanol is 1:1. The cleaning time is 3-5 minutes. After cleaning, most of the 75% ethanol is wrung out. Then, the two single-layer rubber sheets are laid flat on the screen to drain, thus obtaining the recycled mesh adhesive.

[0071] The recycled mesh adhesive was crushed into 1-2 cm pieces using a crusher. Then, it was added to a dissolving tank at a mass ratio of 2:8 (recycled mesh adhesive: new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until both the new adhesive and recycled mesh adhesive were completely dissolved, resulting in a dissolving solution. The solution was then vacuumed at -0.08M for about 1 hour. The solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the solution was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0072] Comparative Example 7

[0073] Collect the tightly pressed mesh adhesive with double rubber layers that has just come off the shot press, and place it in a clean storage room (temperature 20℃, humidity 40%-50%) for 1-2 hours to cool.

[0074] The cooled rubber is pressed through the gap between symmetrically arranged planar rollers. The gap width of the planar rollers is controlled to be 1 / 3 of the thickness of the rubber, and the rotation speed is controlled to be 1-3 rpm. Under pressure, the air and grease in the double-layer rubber are squeezed out from the holes left in the pressing process. The flow of air and grease breaks through the double-layer rubber that is stuck at the cut, and finally the pressed rubber is obtained.

[0075] The pressed mesh adhesive is torn apart along the joint surface of the double-layer rubber using a screen puller to fully expose the grease between the double-layer rubber. The mesh adhesive is then cleaned with 75% ethanol in a cleaning machine (without ultrasonic treatment). The mass ratio of mesh adhesive to 75% ethanol is 1:1. The cleaning time is 3-5 minutes. After cleaning, most of the 75% ethanol is wrung out. Then, the two single-layer rubber sheets are laid flat on the screen to drain, thus obtaining the recycled mesh adhesive.

[0076] The recycled mesh adhesive was crushed into small pieces of 1-2 cm using a crusher. Then, it was added to a dissolving tank at a mass ratio of 4:6 (recycled mesh adhesive: new adhesive). The dissolving process was carried out at 70°C and stirred for 1 hour until the new adhesive and recycled mesh adhesive were completely dissolved, resulting in an adhesive solution. The solution was then vacuumed at -0.08M for about 1 hour. The adhesive solution was then transferred out of the dissolving tank and stabilized for another 4 hours. Finally, the solution was shot-pressed using a shot-pressing mold to obtain capsules. The performance data of the obtained capsules are shown in Table 2.

[0077] The test methods are shown in Table 1.

[0078] Table 1

[0079] project Test methods Require viscosity Using NDJ-79 rotary digital viscometer <![CDATA[(2-4)×10 4 mPa.s]]> Initial freezing strength GB 6783 Food Additives Gelatin Appendix A, section A.4 ≥160 Shot leakage rate Randomly select 100 capsules, remove any that are leaking, and calculate the percentage. ≤5％ Total bacterial count (CFU) GB 4789.2 National Food Safety Standard - Microbiological Examination of Food - Determination of Total Colony Count ≤1000 coliform bacteria MPN GB 4789.3 National Food Safety Standard: Microbiological Examination of Food - Coliform Count ≤0.92 Mold and yeast CFU GB 4789.15 National Food Safety Standard: Microbiological Examination of Food - Counting of Molds and Yeasts ≤50

[0080] Table 2

[0081]

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A method for recovering the gelatinous residue from soft capsules, characterized in that, Includes the following steps: Place the tightly pressed double-layered rubber mesh in an environment with a temperature of 15-25℃ and a humidity of 40-50% for 1-2 hours to cool. The cooled mesh adhesive is pressed through the gap between symmetrically arranged planar rollers. Under pressure, the air and grease between the two layers of rubber are squeezed out from the cut holes left in the pressing process. The flow of air and grease is used to break apart the bonded two layers of rubber. Then the two layers of rubber are torn apart along the joint. The grease between the two layers of rubber is cleaned with a polar solvent to obtain recycled mesh adhesive. The ratio of the gap width between symmetrically arranged planar rollers to the thickness of the adhesive web is 1:2-1:4; The symmetrically arranged planar rollers rotate at a speed of 1-3 revolutions per minute.

2. The method for recycling adhesive according to claim 1, characterized in that, The polar solvent is selected from 75-95% ethanol solution.

3. The method for recycling adhesive according to claim 1, characterized in that, The mass ratio of the polar solvent to the adhesive is 1:1 to 1:

2.

4. The method for recycling adhesive according to claim 1, characterized in that, The cleaning process also includes using ultrasound for degreasing and cleaning.

5. The method for recycling adhesive according to claim 4, characterized in that, The ultrasonic treatment time is 3-5 minutes.

6. The method for recycling web adhesive according to claim 1, characterized in that, The reticulum recycling method also includes using the recycled reticulum to prepare soft capsules.

7. The method for recycling web adhesive according to claim 6, characterized in that, The specific steps for preparing soft capsules using recycled mesh are as follows: The recycled glue is mixed with the new glue in proportion during the next glue-making process. After glue-making, a glue solution is obtained, which is then pressed into soft capsules.

8. The method for recycling adhesive according to claim 7, characterized in that, In the adhesive solution, recycled mesh adhesive accounts for 20-40 wt%, and the remainder is new adhesive.

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