Production method of high-strength collagen casing shrinkage pipe

Abstract

The invention relates to a production method of a high-strength collagen casing shrinkage pipe, which comprises the following steps: S1, drawing an inflated collagen casing to a flattening conveying roller, flattening the collagen casing through the flattening conveying roller, and drawing the flattened collagen casing to a spraying device; s2, atomizing the glue humidifying liquid by a high-pressure nozzle of a spraying device, uniformly spraying the atomized glue humidifying liquid on the outer surface of the flattened collagen casing, and winding the flattened collagen casing into a roll by a traction wheel set; s3, unrolling the coiled collagen casing, and then carrying out sleeve shrinkage treatment by a sleeve shrinkage machine; according to the production method disclosed by the invention, the glue is uniformly atomized and sprayed on the outer surface of the collagen casing by using a high-pressure nozzle, so that the collagen casing is bonded by the glue between wrinkles formed by sleeving and shrinking, the bonding strength of the collagen casing sleeving and shrinking pipe is improved, the length of the collagen casing sleeving and shrinking pipe is 40cm, the collagen casing sleeving and shrinking pipe is not broken, and the service life of the collagen casing sleeving and shrinking pipe is prolonged. And the shrinkage qualification rate is effectively improved, and high-speed production of 10000 m / h high-strength collagen casings can be realized.

Description

Technical Field

[0001] This invention relates to the field of sausage casing tubing production technology, and in particular to a method for producing high-strength collagen sausage casing tubing. Background Technology

[0002] Collagen casing shrink tubes are made by compressing and folding long strips of collagen casings into a tightly corrugated tube shape using a shrink tube machine, making them convenient for use during subsequent enema treatments.

[0003] Chinese invention patent CN120898914A discloses a method for extracting edible collagen and preparing collagen casings. In this method, collagen slurry is extruded using an extruder, solidified, and dried into a cylindrical casing shape. The formed casing is then moistened and processed into a tubular product using a shrinking machine. This production method, which involves moistening the dried collagen casing and then pleating it to obtain a shrinkable collagen casing, relies on the vacuum pressure difference between the pleats to achieve adhesion. However, this vacuum pressure difference is insufficient to meet the strength requirements of collagen casing shrinkable tubes with a length ≥35 cm. Furthermore, the loose pleats of the shrinkable tube make it prone to breakage, limiting the length of the shrinkable casing, resulting in a low shrinkage pass rate and increased packaging costs.

[0004] Therefore, this invention proposes a method for producing high-strength collagen sausage casing tubing to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a production method for high-strength collagen casing shrink tubes, so that the bonding strength between the folds of the casing shrink tube meets the requirements for collagen casing shrink tubes with a length ≥35 cm, thereby improving the shrink tube qualification rate.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a method for producing high-strength collagen sausage casing tubing, the innovation of which lies in: including the following steps: S1. Collagen glue is extruded by an extruder, inflated, dried and shaped to obtain collagen casing. The inflated collagen casing is pulled to a flattening conveyor roller. The collagen casing is flattened by the flattening conveyor roller and then pulled to a spraying device. S2. The high-pressure nozzle of the spraying device atomizes the glue humidifying liquid and sprays it evenly onto the outer surface of the flattened collagen casing. After the flattened collagen casing is sprayed with glue humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set. S3. After the rolled collagen casings are unrolled, they are folded and shaped by a shrinking machine to obtain high-strength collagen casing shrink tubes.

[0007] Furthermore, the spraying device includes a fixed box, the fixed box having a first passageway for collagen casings to pass through, and openings on both sides of the first passageway for collagen casings to enter and exit the fixed box. The fixed housing contains two high-pressure nozzles for forming a fan-shaped spray. The two high-pressure nozzles are respectively located on both sides of the first passageway. Each high-pressure nozzle has a liquid nozzle and an air nozzle on the side facing the first passageway. The air nozzle is annularly surrounding the liquid nozzle. The high-pressure nozzle has a liquid supply channel connecting the liquid nozzle and an air supply channel connecting the air nozzle. The air supply channel has two branch channels. The ends of the two branch channels are distributed on both sides of the air nozzle along a direction parallel to the first passageway, and both extend to the side of the air nozzle close to the first passageway. The ends of the two branch channels have circular holes facing the first passageway.

[0008] Furthermore, the high-pressure nozzle uses a peristaltic pump to provide kinetic energy to pump the adhesive humidifying liquid into the liquid supply channel, and the amount of adhesive humidifying liquid sprayed is controlled by adjusting the pump speed of the peristaltic pump. The speed of the peristaltic pump is controlled at 100~230 rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 3~10 bar, and the moisture content in the flattened collagen casing after spraying the adhesive humidifying liquid is 15~25%.

[0009] Furthermore, the rotation speed of the peristaltic pump is controlled at 160~170 rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 6~7 bar, and the moisture content in the flattened collagen casing after spraying the adhesive humidifying liquid is 19~21%.

[0010] Furthermore, the glue in the glue humidifying solution is a water-soluble edible glue with a concentration of 3-10%.

[0011] Furthermore, the water-soluble edible adhesive is gum arabic, xanthan gum, or locust bean gum.

[0012] Furthermore, the inflated collagen casing is pulled to the flattening conveyor roller. Before entering the flattening conveyor roller, the inflation diameter of the collagen casing is captured by a diameter laser measuring instrument. The inflation pressure inside the inflated collagen casing is adjusted according to the captured inflation diameter so that the diameter of the flattened collagen casing meets the requirements.

[0013] Furthermore, the flattening conveyor roller rotates at a speed of 10,000 m / h, and the inflation pressure of the collagen casing in the inflated state before entering the flattening conveyor roller is 400 Pa.

[0014] Furthermore, the switching wheel group includes several switching wheels that can move up and down. The central axes of the several switching wheels are set horizontally and are parallel to each other. The several switching wheels are divided into an upper switching wheel group and a lower switching wheel group. The switching wheels of the upper switching wheel group and the switching wheels of the lower switching wheel group are spaced apart. There is a distance between adjacent switching wheels of the lower switching wheel group for the switching wheels of the upper switching wheel group to move through. The traction wheel assembly includes two traction wheels arranged side by side, and each traction wheel is equipped with a traction force sensor for detecting changes in the traction force of collagen casing.

[0015] Furthermore, after the flattened collagen casing is sprayed with adhesive humidifying liquid, it passes through the switching wheel group and is wound into a roll by the traction wheel group. During this process, it is necessary to periodically check the humidity of the flattened collagen casing after spraying with adhesive humidifying liquid so as to adjust the amount of adhesive humidifying liquid sprayed in a timely manner. The humidification process was conducted offline, and the operation included: S1. Cutting and Sampling: Cut the casing on the traction wheel that is being wound. The traction force sensor feeds back the change in traction force to the switching wheel group. The switching wheel of the upper switching wheel group moves downward to press the casing downward. The switching wheel of the lower switching wheel group presses the casing upward, keeping the end of the casing still. The casing is wound onto another traction wheel and traction begins. The traction force sensor feeds back the change in traction force to the switching wheel group. The switching wheel of the switching wheel group slowly returns to its initial position, so that a second passageway is formed between the switching wheels of the upper and lower switching wheel groups, allowing the casing to pass through without contacting the switching wheel. S2. Offline testing: After sampling the casings on the untraction wheel, the original weight of the samples is obtained by weighing them using a heated balance. Then, the weight of the samples after water loss is obtained after heating at 110℃ for 5 minutes. The percentage of water loss to the original weight is the moisture content of the casings.

[0016] The advantages of this invention are: (1) The production method of the present invention uses a high-pressure nozzle to uniformly atomize and spray glue onto the outer surface of collagen casing, so that the collagen casing is bonded by glue in the folds formed by shrinkage, which improves the bonding strength of the shrinkage tube of collagen casing, and makes the shrinkage tube of collagen casing reach 40cm in length without breaking. The shrinkage qualification rate is effectively improved, and high-speed production of high-strength collagen casing of 10000m / h can be achieved, and the production efficiency is greatly improved.

[0017] (2) The spraying device used in this invention has a high-pressure nozzle with a dual-fluid external mixing type. The air nozzle surrounds the liquid nozzle, so that the sprayed air surrounds the glue humidifying liquid. The high-speed flow of the air creates a vacuum, which disperses the glue humidifying liquid once to form a slender solid cone-shaped gas-liquid two-phase mixture. At this time, the round holes of the branch pipes on both sides of the nozzle spray air, turning the two-phase mixture into a fan-shaped jet, realizing the secondary dispersion of the glue humidifying liquid and improving the uniformity of liquid atomization. The fan-shaped spray formed by the high-pressure nozzle not only has a clear boundary line, but also the length direction of the fan-shaped spray is consistent with the direction of the casing, which effectively improves the utilization rate of the glue humidifying liquid. The unique design of the high-pressure nozzle has great adaptability to liquids with high viscosity and easy agglomeration.

[0018] (3) The production method of the present invention greatly reduces the adverse effects on production efficiency caused by the need for sampling for humidity detection through the cooperation of traction force sensors on two traction wheels and switching groups. Sampling can be completed without stopping or slowing down the machine, thus achieving production without interruption. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the spraying apparatus of the present invention.

[0021] Figure 2 This is a schematic diagram of the high-pressure nozzle of the present invention.

[0022] Figure 3 This is a schematic diagram showing the direction of the fan-shaped spray formed by the high-pressure nozzle of the present invention and the casing.

[0023] Figure 4 This is a schematic diagram of the switching wheel of the switching wheel assembly of the present invention returning to its initial position.

[0024] Figure 5 This is a schematic diagram of the switching wheel group movement assisting in casing roll changing according to the present invention. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] Example 1 This embodiment provides a method for producing high-strength collagen sausage casing tubing, including the following steps: S1. Collagen glue is extruded by an extruder, inflated, dried and shaped to obtain collagen casing. The inflated collagen casing is pulled to a flattening conveyor roller. After the collagen casing is flattened by the flattening conveyor roller, the gas inside the casing is eliminated and the diameter remains unchanged. Then it is pulled to a spraying device. The inflated collagen casing is drawn to the flattening conveyor roller. Before entering the flattening conveyor roller, the inflation diameter of the collagen casing is captured by a diameter laser measuring instrument. The inflation pressure inside the inflated collagen casing is adjusted according to the captured inflation diameter to ensure that the flattened collagen casing diameter meets the requirements. In this embodiment, the flattening conveyor roller rotates at a speed of 10000 m / h, and the inflation pressure of the inflated collagen casing before entering the flattening conveyor roller is 400 Pa.

[0027] S2. The high-pressure nozzle of the spraying device atomizes the glue humidifying liquid and sprays it evenly onto the outer surface of the flattened collagen casing. The linear velocity of the collagen casing is 10,000 m / h. The glue humidifying liquid is a mixture of gum arabic and pure water, with a gum arabic mass concentration of 3%. After the flattened collagen casing is sprayed with the glue humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set.

[0028] In this embodiment, as Figure 1-2 As shown, the spraying device includes a fixed box 1, which has a first passageway for collagen casings to pass through, and openings on both sides of the first passageway for collagen casings to enter and exit the fixed box 1.

[0029] The fixed housing 1 contains two high-pressure nozzles 2 for forming a fan-shaped spray. The two high-pressure nozzles 2 are respectively located on the upper and lower sides of the first passageway. Each high-pressure nozzle has a liquid nozzle 21 and an air nozzle 22 on the side facing the first passageway. The liquid nozzle 21 is a circular hole with a diameter of 2.5 mm. The air nozzle 22 is annularly surrounding the liquid nozzle 21. The high-pressure nozzle 2 has a liquid supply channel 23 connecting the liquid nozzle and an air supply channel 24 connecting the air nozzle. The air supply channel 24 has two branch channels 25. The ends of the two branch channels 25 are distributed on both sides of the air nozzle 22 in a direction parallel to the first passageway, and both extend to the side of the air nozzle 22 close to the first passageway. The ends of the two branch channels 25 have circular holes 26 facing the first passageway.

[0030] The high-pressure nozzle employs a dual-fluid external mixing type, with an air nozzle surrounding the liquid nozzle. This allows the ejected air to surround the adhesive humidifying liquid, and the high-speed airflow creates a vacuum, initially dispersing the adhesive humidifying liquid into a slender, solid cone-shaped gas-liquid two-phase mixture. At this point, air is ejected from the circular holes of the branch pipes on both sides of the nozzle, transforming the two-phase mixture into a fan-shaped jet, achieving secondary dispersion of the adhesive humidifying liquid and improving the uniformity of liquid atomization. The fan-shaped spray formed by the high-pressure nozzle not only has a clear boundary line, but its length direction is also consistent with the direction of the casing. Figure 3 As shown ( Figure 3 The direction of the cut head is in the direction of the casing, which effectively improves the utilization rate of the glue humidifying liquid. The unique design of the high-pressure nozzle has great adaptability to highly viscous and easily agglomerated liquids.

[0031] The high-pressure nozzle 2 pumps the adhesive humidifying liquid into the liquid supply channel 23 using a peristaltic pump. The spraying volume of the adhesive humidifying liquid is controlled by adjusting the pump speed of the peristaltic pump. High-pressure air is injected into the air supply channel 24 by a high-pressure air pump. In this embodiment, the rotation speed of the peristaltic pump is controlled at 170 rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 6.5 bar, and the moisture content of the flattened collagen casing after spraying the adhesive humidifying liquid is controlled at 20%. This moisture control improves the plasticity of the casing, which is beneficial for subsequent shrinking processing, and also enhances the toughness of the casing, which is beneficial for filling applications.

[0032] S3. After the rolled collagen casings are unrolled, they are folded and shaped by a shrinking machine to obtain high-strength collagen casing shrink tubes.

[0033] In this embodiment, as Figure 4-5 As shown, the switching wheel group 3 includes five vertically movable switching wheels. Each switching wheel is moved by an electric push rod. The central axes of the five switching wheels are horizontally arranged and parallel to each other. The two upper switching wheels are divided into the upper switching wheel group 31, and the three lower switching wheels are divided into the lower switching wheel group 32. The switching wheels of the upper switching wheel group 31 and the switching wheels of the lower switching wheel group 32 are spaced apart, and there is a distance between adjacent switching wheels of the lower switching wheel group 32 for the switching wheels of the upper switching wheel group 31 to move through. The traction wheel group 4 includes two parallel traction wheels. Both traction wheels are equipped with traction force sensors to detect changes in the traction force of the collagen casing, ensuring that the tightness of the casing is moderate after winding.

[0034] In this embodiment, after the flattened collagen casing is sprayed with adhesive humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set. During this process, it is necessary to periodically check the humidity of the flattened collagen casing after spraying with adhesive humidifying liquid so as to adjust the amount of adhesive humidifying liquid sprayed in a timely manner.

[0035] The humidification process was tested offline, and the procedure included: S1. Cutting and Sampling: The casing on the winding traction wheel is cut off. The traction force sensor feeds back the change in traction force to the switching wheel group 3. The switching wheel of the upper switching wheel group 31 moves downward, pressing the casing downward, while the switching wheel of the lower switching wheel group 32 presses the casing upward. Figure 5 As shown, keeping the end of the casing still, the casing is wound onto another traction wheel and traction begins. The traction force sensor feeds back the change in traction force to the switching wheel group 3. The switching wheel of the switching wheel group 3 slowly returns to its initial position. At this time, the upper switching wheel group 31 is above the lower switching wheel group 32, forming a second passageway between the switching wheels of the upper switching wheel group 31 and the lower switching wheel group 32, allowing the casing to pass through without contacting the switching wheels. Figure 4 As shown; S2. Offline testing: After sampling the casings on the untraction wheel, the original weight of the samples is obtained by weighing them using a heated balance. Then, the weight of the samples after water loss is obtained after heating at 110℃ for 5 minutes. The percentage of water loss to the original weight is the moisture content of the casings.

[0036] Example 2 This embodiment provides a method for producing high-strength collagen sausage casing tubing, including the following steps: S1. Collagen glue is extruded through an extruder, inflated, dried and shaped to obtain collagen casings. The inflated collagen casings are pulled to a flattening conveyor roller, which rotates at a speed of 10,000 m / h. The inflation pressure of the inflated collagen casings before entering the flattening conveyor roller is 400 Pa. After the collagen casings are flattened by the flattening conveyor roller, the gas inside the casings is eliminated and the diameter remains unchanged. Then, they are pulled to a spraying device.

[0037] S2. The high-pressure nozzle of the spraying device atomizes the glue humidifying liquid and sprays it evenly onto the outer surface of the flattened collagen casing. The linear velocity of the collagen casing is 10,000 m / h. The glue humidifying liquid is a mixture of xanthan gum and purified water with a xanthan gum mass concentration of 5%. After the flattened collagen casing is sprayed with the glue humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set.

[0038] A high-pressure nozzle uses a peristaltic pump to deliver adhesive humidifying liquid into the supply channel. The spray volume of the adhesive humidifying liquid is controlled by adjusting the pump speed of the peristaltic pump. High-pressure air is injected into the air supply channel via a high-pressure air pump. In this embodiment, the peristaltic pump speed is controlled at 170 rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 6.5 bar, and the moisture content of the flattened collagen casing after spraying the adhesive humidifying liquid is controlled at 20%.

[0039] S3. After the rolled collagen casings are unrolled, they are folded and shaped by a shrinking machine to obtain high-strength collagen casing shrink tubes.

[0040] Example 3 This embodiment provides a method for producing high-strength collagen sausage casing tubing, including the following steps: S1. Collagen glue is extruded through an extruder, inflated, dried and shaped to obtain collagen casings. The inflated collagen casings are pulled to a flattening conveyor roller, which rotates at a speed of 10,000 m / h. The inflation pressure of the inflated collagen casings before entering the flattening conveyor roller is 400 Pa. After the collagen casings are flattened by the flattening conveyor roller, the gas inside the casings is eliminated and the diameter remains unchanged. Then, they are pulled to a spraying device.

[0041] S2. The high-pressure nozzle of the spraying device atomizes the glue humidifying liquid and sprays it evenly onto the outer surface of the flattened collagen casing. The linear velocity of the collagen casing is 10,000 m / h. The glue humidifying liquid is a mixture of locust bean gum and purified water. The mass concentration of locust bean gum is 10%. After the flattened collagen casing is sprayed with glue humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set.

[0042] A high-pressure nozzle uses a peristaltic pump to deliver adhesive humidifying liquid into the supply channel. The spray volume of the adhesive humidifying liquid is controlled by adjusting the pump speed of the peristaltic pump. High-pressure air is injected into the air supply channel via a high-pressure air pump. In this embodiment, the peristaltic pump speed is controlled at 170 rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 6.5 bar, and the moisture content of the flattened collagen casing after spraying the adhesive humidifying liquid is controlled at 20%.

[0043] S3. After the rolled collagen casings are unrolled, they are folded and shaped by a shrinking machine to obtain high-strength collagen casing shrink tubes.

[0044] Comparative Example This comparative example provides a method for producing collagen sausage casing tubing, including the following steps: S1. Collagen glue is extruded through an extruder, inflated, dried and shaped to obtain collagen casings. The inflated collagen casings are pulled to a flattening conveyor roller, which rotates at a speed of 10,000 m / h. The inflation pressure of the inflated collagen casings before entering the flattening conveyor roller is 400 Pa. After the collagen casings are flattened by the flattening conveyor roller, the gas inside the casings is eliminated and the diameter remains unchanged. Then, they are pulled to a spraying device.

[0045] S2. The high-pressure nozzle of the spraying device atomizes pure water and sprays it evenly onto the outer surface of the flattened collagen casing. The linear speed of the collagen casing is 10,000 m / h. After being sprayed with pure water, the flattened collagen casing passes through the switching wheel set and is wound into a roll by the traction wheel set.

[0046] A high-pressure nozzle uses a peristaltic pump to deliver purified water into the supply channel. The amount of purified water sprayed is controlled by adjusting the pump speed of the peristaltic pump. High-pressure air is injected into the air supply channel via a high-pressure air pump. In this comparative example, the peristaltic pump speed is controlled at 170 rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 6.5 bar, and the moisture content of the flattened collagen casing after spraying purified water is controlled at 20%.

[0047] S3. After the rolled collagen casings are unrolled, they are folded and shaped by a shrinking machine to obtain high-strength collagen casing shrink tubes.

[0048] The following table shows a comparison of the process parameters and tube shrinkage performance test results between Examples 1-3 and the comparative examples: Table 1. Process parameters and tubing performance test results of Examples 1-3 and Comparative Examples As can be seen from Table 1, the fracture strength of the collagen casing shrink tube obtained by the production method of the present invention has been significantly improved. In the comparative example, the casing shrink tube broke at a length of 26cm. The casing shrink tubes produced in Examples 1 to 3 did not break even when the length reached 40cm. Later, the length of the casing shrink tube was maintained at 40cm by artificial cutting, and the casing shrink tube qualification rate was also greatly improved.

[0049] Although the unsleeving force of the sausage casings produced in Examples 1-3 is slightly stronger than that of the comparative example, performance evaluation of the unsleeving process shows that they can all be unsleeved smoothly without any jamming or bursting. The detailed operation process is as follows: First, the pork and fat were chopped using a blade. Then, sugar, salt, spices, minced garlic, and flavor enhancer were added and mixed thoroughly. Finally, the minced meat was vacuum degassed for 10 minutes while stirring to obtain sausage mince. The ingredient composition of the sausage mince is shown in Table 2. The sausage mince was used to fill the casing shrink tube samples of the comparative example and Examples 1-3 on a vacuum filler. The samples were then distributed and connected into sausage chains consisting of 70g sausages each using an automatic filling and twisting hanger. All samples were resistant to filling, portioning, and connecting without interruption. The filling parameters are shown in Table 3.

[0050] Table 2. Raw material composition of sausage mince Table 3 Filling Parameters Examples 4-9 Examples 4-9 used the same steps as the production method of high-strength collagen sausage casing shrink tube in Example 1, but changed the process parameters in the production method steps. After obtaining the high-strength collagen sausage casing shrink tube, the performance of the high-strength collagen sausage casing shrink tube was tested. The process parameters and performance test results are shown in Table 4.

[0051] Table 4. Process parameters and performance test data for Examples 4-9 As shown in Table 4, the production method of the present invention uses a high-pressure nozzle to uniformly atomize and spray adhesive onto the outer surface of the collagen casing, so that the collagen casing is bonded to the folds formed by the shrinkage, which improves the bonding strength of the collagen casing shrinkage tube, allowing the collagen casing shrinkage tube to reach a length of 40cm without breaking, effectively improving the shrinkage qualification rate, achieving a high-speed production of 10,000m / h, and obtaining casing shrinkage tubes with stable performance. The production method has good repeatability and is suitable for large-scale production.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for producing a high-strength collagen sausage casing tubing, characterized in that: Includes the following steps: S1. Collagen glue is extruded by an extruder, inflated, dried and shaped to obtain collagen casing. The inflated collagen casing is pulled to a flattening conveyor roller. The collagen casing is flattened by the flattening conveyor roller and then pulled to a spraying device. S2. The high-pressure nozzle of the spraying device atomizes the glue humidifying liquid and sprays it evenly onto the outer surface of the flattened collagen casing. After the flattened collagen casing is sprayed with glue humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set. S3. After the rolled collagen casings are unrolled, they are folded and shaped by a shrinking machine to obtain high-strength collagen casing shrink tubes.

2. The method for producing high-strength collagen sausage casing tubing according to claim 1, characterized in that: The spraying device includes a fixed box, which has a first passageway for collagen casings to pass through, and openings on both sides of the first passageway for collagen casings to enter and exit the fixed box. The fixed housing contains two high-pressure nozzles for forming a fan-shaped spray. The two high-pressure nozzles are respectively located on both sides of the first passageway. Each high-pressure nozzle has a liquid nozzle and an air nozzle on the side facing the first passageway. The air nozzle is annularly surrounding the liquid nozzle. The high-pressure nozzle has a liquid supply channel connecting the liquid nozzle and an air supply channel connecting the air nozzle. The air supply channel has two branch channels. The ends of the two branch channels are distributed on both sides of the air nozzle along a direction parallel to the first passageway, and both extend to the side of the air nozzle close to the first passageway. The ends of the two branch channels have circular holes facing the first passageway.

3. The method for producing high-strength collagen sausage casing tubing according to claim 2, characterized in that: The high-pressure nozzle pumps the adhesive humidifying liquid into the liquid supply channel using a peristaltic pump. The amount of adhesive humidifying liquid sprayed is controlled by adjusting the pump speed of the peristaltic pump, which is controlled at 100-230 rpm. The air pressure in the air supply channel of the high-pressure nozzle is controlled at 3-10 bar. The moisture content in the flattened collagen casing after spraying the adhesive humidifying liquid is 15-25%.

4. The method for producing high-strength collagen sausage casing tubing according to claim 3, characterized in that: The peristaltic pump speed is controlled at 160~170rpm, the air pressure in the air supply channel of the high-pressure nozzle is controlled at 6~7bar, and the moisture content in the flattened collagen casing after spraying the adhesive humidifying liquid is 19~21%.

5. The method for producing high-strength collagen sausage casing tubing according to claim 1, characterized in that: The adhesive in the adhesive humidifying solution is a water-soluble, edible adhesive with a concentration of 3-10%.

6. The method for producing high-strength collagen sausage casing tubing according to claim 5, characterized in that: The water-soluble edible adhesive is gum arabic, xanthan gum, or locust bean gum.

7. The method for producing high-strength collagen sausage casing tubing according to claim 1, characterized in that: The inflated collagen casing is pulled to the flattening conveyor roller. Before entering the flattening conveyor roller, the inflation diameter of the collagen casing is captured by a diameter laser measuring instrument. The inflation pressure inside the inflated collagen casing is adjusted according to the captured inflation diameter so that the diameter of the flattened collagen casing meets the requirements.

8. The method for producing high-strength collagen sausage casing tubing according to claim 1, characterized in that: The flattening conveyor roller rotates at a speed of 10,000 m / h, and the inflation pressure of the collagen casing in the inflated state before entering the flattening conveyor roller is 400 Pa.

9. The method for producing high-strength collagen sausage casing tubing according to claim 1, characterized in that: The switching wheel group includes several switching wheels that can move up and down. The central axes of the several switching wheels are set horizontally and are parallel to each other. The several switching wheels are divided into an upper switching wheel group and a lower switching wheel group. The switching wheels of the upper switching wheel group and the switching wheels of the lower switching wheel group are spaced apart. There is a distance between adjacent switching wheels of the lower switching wheel group for the switching wheels of the upper switching wheel group to move through. The traction wheel assembly includes two traction wheels arranged side by side, and each traction wheel is equipped with a traction force sensor for detecting changes in the traction force of collagen casing.

10. The method for producing high-strength collagen sausage casing tubing according to claim 9, characterized in that: After the flattened collagen casing is sprayed with glue and humidifying liquid, it passes through the switching wheel set and is wound into a roll by the traction wheel set. During this process, it is necessary to periodically check the humidity of the flattened collagen casing after spraying with glue and humidifying liquid so as to adjust the amount of glue and humidifying liquid sprayed in time. The humidification process was conducted offline, and the operation included: S1. Cutting and Sampling: Cut the casing on the traction wheel that is being wound. The traction force sensor feeds back the change in traction force to the switching wheel group. The switching wheel of the upper switching wheel group moves downward to press the casing downward. The switching wheel of the lower switching wheel group presses the casing upward, keeping the end of the casing still. The casing is wound onto another traction wheel and traction begins. The traction force sensor feeds back the change in traction force to the switching wheel group. The switching wheel of the switching wheel group slowly returns to its initial position, so that a second passageway is formed between the switching wheels of the upper and lower switching wheel groups, allowing the casing to pass through without contacting the switching wheel. S2. Offline testing: After sampling the casings on the untraction wheel, the original weight of the samples is obtained by weighing them using a heated balance. Then, the weight of the samples after water loss is obtained after heating at 110℃ for 5 minutes. The percentage of water loss to the original weight is the moisture content of the casings.

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