A method for preparing fish skin collagen sausage casings

Abstract

This invention provides a method for preparing fish skin collagen casings, which can spray a cross-linking modified liquid onto the outer surface of the fish skin collagen casing and then dry it; it can also automatically adjust the flow rate of the liquid sprayed onto the outer surface of the fish skin collagen casing according to the conveying speed of the fish skin collagen casing, so that the flow rate of the liquid sprayed onto the outer surface of the fish skin collagen casing is adapted to the conveying speed of the fish skin collagen casing; it can also automatically adjust the flow rate of the gas sprayed onto the outer surface of the fish skin collagen casing according to the conveying speed of the fish skin collagen casing, so that the flow rate of the gas sprayed onto the outer surface of the fish skin collagen casing is adapted to the conveying speed of the fish skin collagen casing.

Description

Technical Field

[0001] This invention relates to a method for preparing fish skin collagen casings. Background Technology

[0002] Fish skin collagen casings are made from descaled fish skin. The outer surface of the fish skin collagen casing is sprayed with a cross-linking modification liquid and then dried to improve the performance of the fish skin collagen casing.

[0003] Generally, a conveyor roller is used to transport fish skin collagen casings. During the transport process, a cross-linking modification liquid is sprayed onto the outer surface of the fish skin collagen casings, and hot air is sprayed onto the outer surface of the fish skin collagen casings sprayed with the cross-linking modification liquid to dry the cross-linking modification liquid on the outer surface of the fish skin collagen casings.

[0004] On the existing production line, the flow rate of the liquid (crosslinking modified liquid) sprayed onto the outer surface of the fish skin collagen casing remains constant, as does the flow rate of the gas (hot air) sprayed onto the outer surface of the fish skin collagen casing. However, the conveying speed of the fish skin collagen casing may change (the conveying speed increases or decreases). Therefore, there may be problems where the flow rate of the liquid sprayed onto the outer surface of the fish skin collagen casing is not compatible with the conveying speed of the fish skin collagen casing, and the flow rate of the gas sprayed onto the outer surface of the fish skin collagen casing is not compatible with the conveying speed of the fish skin collagen casing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for preparing fish skin collagen casings, which involves preparing fish skin collagen casings using descaled fish skin, spraying a cross-linking modification liquid onto the outer surface of the fish skin collagen casings, and then drying them.

[0006] Furthermore, the frequency of extracting the crosslinking modification liquid, spraying the crosslinking modification liquid onto the outer surface of the fish skin collagen casing, extracting air, and spraying air onto the outer surface of the fish skin collagen casing are adjusted according to the rotation frequency of the conveying rollers that transport the fish skin collagen casing; thereby adapting the flow rate of the crosslinking modification liquid sprayed onto the outer surface of the fish skin collagen casing and the flow rate of the air sprayed onto the outer surface of the fish skin collagen casing to the conveying speed of the fish skin collagen casing.

[0007] Preferably, a spray drying device is used to spray a cross-linking modified liquid onto the outer surface of the fish skin collagen casing and then dry it; for details of the spray drying device and its usage, please refer to the embodiments.

[0008] The advantages and beneficial effects of this invention are as follows: It provides a method for preparing fish skin collagen casings, which can spray cross-linking modified liquid onto the outer peripheral surface of the fish skin collagen casing and dry it; it can also automatically adjust the flow rate of the liquid sprayed onto the outer peripheral surface of the fish skin collagen casing according to the conveying speed of the fish skin collagen casing, so that the flow rate of the liquid sprayed onto the outer peripheral surface of the fish skin collagen casing is adapted to the conveying speed of the fish skin collagen casing; it can also automatically adjust the flow rate of the gas sprayed onto the outer peripheral surface of the fish skin collagen casing according to the conveying speed of the fish skin collagen casing, so that the flow rate of the gas sprayed onto the outer peripheral surface of the fish skin collagen casing is adapted to the conveying speed of the fish skin collagen casing. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention. Implementation

[0010] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0011] The specific technical solution of this invention is as follows:

[0012] like Figure 1 As shown, a method for preparing fish skin collagen casings involves using descaled fish skin to prepare fish skin collagen casings 9, and using a spray drying device to spray a cross-linking modification liquid onto the outer surface of the fish skin collagen casings 9 and then drying it; the cross-linking modification liquid contains glycerol and glutaraldehyde.

[0013] The spray drying device includes: a left conveying roller 11, a horizontal cylinder 12, and a right conveying roller 13 arranged sequentially from left to right; the roller shafts of the left conveying roller 11 and the right conveying roller 13 are respectively placed horizontally in the front-back direction; the horizontal cylinder 12 is placed horizontally in the left-right direction; spray nozzles are evenly distributed on the inner circumferential wall of the left half of the horizontal cylinder 12, and a vertically placed liquid delivery pipe 31 is connected to the left end of the horizontal cylinder 12; an internal liquid delivery channel is provided inside the cylinder wall of the left half of the horizontal cylinder 12 to connect each spray nozzle to the liquid delivery pipe 31; air jet nozzles are evenly distributed on the inner circumferential wall of the right half of the horizontal cylinder 12, and a vertically placed air delivery pipe 32 is connected to the right end of the horizontal cylinder 12; an internal air delivery channel is provided inside the cylinder wall of the right half of the horizontal cylinder 12 to connect each air jet nozzle to the air delivery pipe 32; a replenishment pipe 41 placed horizontally in the left-right direction is connected to the bottom end of the liquid delivery pipe 31, and an air delivery pipe 3... A horizontally positioned air supply pipe 42 is connected to the bottom end of the cylinder 2. Both the liquid supply pipe 41 and the air supply pipe 42 are located below the horizontal cylinder 12 and are coaxial. A horizontally positioned piston cylinder 51 is also provided between the liquid supply pipe 41 and the air supply pipe 42. The left end of the piston cylinder 51 is sealed to the right end of the liquid supply pipe 41, and the right end of the piston cylinder 51 is sealed to the left end of the air supply pipe 42. A piston 52 is provided inside the piston cylinder 51, and the piston 52 slides and seals against the inner wall of the piston cylinder 51. A first magnetic block 61 is built into the piston 52. A horizontally positioned sliding groove 53 is provided on the outer wall of the piston cylinder 51. The sliding groove 53 is a through groove. A slider 54 is provided in the sliding groove 53 and slides with it. A second magnetic block 61 is built into the slider 54. Magnetic block 62; the second magnetic block 62 attracts the first magnetic block 61, and the slider 54 can drive the piston 52 to move left and right in the piston cylinder 51 through the mutual attraction between the second magnetic block 62 and the first magnetic block 61; the slider 54 and the roller shaft of the left conveying roller 11 are at the same height, and the front end of the roller shaft of the left conveying roller 11 is fixedly connected to a crank 71 that is horizontally placed in the left and right direction. The right end of the crank 71 is hinged to the left end of a connecting rod 72 that is horizontally placed in the left and right direction. The right end of the connecting rod 72 is hinged to the left end of a push-pull rod 73 that is horizontally placed in the left and right direction. The right end of the push-pull rod 73 is fixedly connected to the left side wall of the slider 54; an infusion valve 81 is provided on the infusion pipe 31, and the infusion valve 81 is close to the replenishment pipe 41; an air valve 82 is provided on the air supply pipe 32, and the air supply valve 82 is close to the replenishment pipe 42; replenishment A replenishing valve 83 is provided on the liquid pipe 41, located on the left side of the infusion pipe 31 and close to it; a replenishing valve 84 is provided on the gas replenishing pipe 42, located on the right side of the gas replenishing pipe 32 and close to it; the infusion valve 81, gas valve 82, replenishing valve 83, and replenishing valve 84 are all one-way valves. The infusion valve 81 only allows the liquid in the infusion pipe 31 to flow from bottom to top, the gas valve 82 only allows the gas in the gas replenishing pipe 32 to flow from bottom to top, the replenishing valve 83 only allows the liquid in the replenishing pipe 41 to flow from left to right, and the replenishing valve 84 only allows the gas in the replenishing pipe 42 to flow from right to left; a liquid supply device is connected to the left end of the replenishing pipe 41, which can supply crosslinked modified liquid to the replenishing pipe 41;The right end of the air supply pipe 42 is open, and an air heating device 2 is also provided on the air supply pipe 42. The air heating device 2 is located to the right of the air supply valve 84.

[0014] The process of spraying a cross-linking modified liquid onto the outer surface of fish skin collagen casings using a spray drying device and then drying it includes the following steps:

[0015] The fish skin collagen casing 9 is conveyed from left to right by the left conveying roller 11 and the right conveying roller 13 and passes through the horizontal cylinder 12; and during the process of conveying the fish skin collagen casing 9 from left to right, the rotating left conveying roller 11 drives the slider 54 to move back and forth in the left and right direction through the crank 71, the connecting rod 72 and the push-pull rod 73 (that is, the slide groove 53 slides back and forth along the slide groove 53 on the outer wall of the piston cylinder 51). The slider 54 drives the piston 52 to move back and forth synchronously in the left and right direction in the piston cylinder 51 through the mutual attraction between the second magnetic block 62 and the first magnetic block 61; the area of ​​the inner cavity of the piston cylinder 51 located to the left of the piston 52 is the left area of ​​the inner cavity of the piston cylinder 51, and the area of ​​the inner cavity of the piston cylinder 51 located to the right of the piston 52 is the right area of ​​the inner cavity of the piston cylinder 51.

[0016] The liquid supply device supplies cross-linking modified liquid to the replenishment pipe 41; each time the piston 52 moves from left to right in the piston cylinder 51, the liquid in the replenishment pipe 41 is drawn into the left side area of ​​the inner cavity of the piston cylinder 51; each time the piston 52 moves from right to left in the piston cylinder 51, the liquid in the left side area of ​​the inner cavity of the piston cylinder 51 is pumped into the infusion pipe 31, thereby causing the liquid to be pumped along the infusion pipe 31 to the spray nozzle on the inner peripheral wall of the left half of the horizontal cylinder 12, and the liquid is sprayed from the spray nozzle to the outer peripheral surface of the fish skin collagen casing 9 passing through the left half of the horizontal cylinder 12, thereby achieving the spraying of cross-linking modified liquid onto the outer peripheral surface of the fish skin collagen casing 9;

[0017] Air heating device 2 heats the air drawn in from the right end of air supply pipe 42; each time piston 52 moves from right to left in piston cylinder 51, air is drawn in from the right end of air supply pipe 42 and the gas in air supply pipe 42 is drawn into the right side area of ​​the inner cavity of piston cylinder 51; each time piston 52 moves from left to right in piston cylinder 51, the gas in the right side area of ​​the inner cavity of piston cylinder 51 is pumped into air supply pipe 32, and then the gas is pumped along air supply pipe 32 to the jet nozzle on the inner peripheral wall of the right half of the horizontal cylinder 12, and the gas is sprayed out from the jet nozzle to the outer peripheral surface of the fish skin collagen casing 9 passing through the right half of the horizontal cylinder 12, thereby drying the cross-linked modified liquid on the outer peripheral surface of the fish skin collagen casing 9;

[0018] If the conveying speed of the fish skin collagen casing 9 increases, the rotation speed of the left conveying roller 11 increases, that is, the rotation frequency of the left conveying roller 11 increases, which will cause the frequency of the piston 52 reciprocating in the left and right directions in the piston cylinder 51 to increase synchronously; if the conveying speed of the fish skin collagen casing 9 decreases, the rotation speed of the left conveying roller 11 decreases, that is, the rotation frequency of the left conveying roller 11 decreases, which will cause the frequency of the piston 52 reciprocating in the left and right directions in the piston cylinder 51 to decrease synchronously.

[0019] If the frequency of the piston 52 reciprocating in the left-right direction within the piston cylinder 51 increases, the frequency of liquid being drawn from the replenishment pipe 41 into the left side of the piston cylinder 51 cavity and the frequency of liquid being pumped from the left side of the piston cylinder 51 cavity into the delivery pipe 31 will increase simultaneously. This will increase the flow rate of liquid pumped along the delivery pipe 31 to the spray nozzle on the inner circumferential wall of the left half of the horizontal cylinder 12, thereby increasing the flow rate of liquid sprayed from the spray nozzle to the outer circumferential surface of the fish skin collagen casing 9. If the frequency of the piston 52 reciprocating in the left-right direction within the piston cylinder 51 decreases, the frequency of liquid being drawn from the replenishment pipe 41 into the piston cylinder 51 will increase. The frequency of liquid pumping into the infusion tube 31 in the left side region of the inner cavity and the left side region of the piston cylinder 51 is reduced synchronously, so that the flow rate of liquid pumped along the infusion tube 31 to the spray nozzle on the inner peripheral wall of the left half of the horizontal cylinder 12 is reduced, thereby reducing the flow rate of liquid sprayed from the spray nozzle to the outer peripheral surface of the fish skin collagen casing 9; thus, the flow rate of liquid sprayed to the outer peripheral surface of the fish skin collagen casing 9 can be automatically adjusted according to the conveying speed of the fish skin collagen casing 9, so that the flow rate of liquid sprayed to the outer peripheral surface of the fish skin collagen casing 9 is adapted to the conveying speed of the fish skin collagen casing 9.

[0020] If the frequency of the piston 52 reciprocating in the left-right direction within the piston cylinder 51 increases, the frequency of air intake at the right end of the air supply pipe 42, the frequency of gas being drawn into the right side of the piston cylinder 51 cavity from the air supply pipe 42, and the frequency of gas being pumped into the air delivery pipe 32 from the right side of the piston cylinder 51 cavity will increase simultaneously. This will increase the flow rate of gas pumped along the air delivery pipe 32 to the jet nozzle on the inner circumferential wall of the right half of the horizontal cylinder 12, thereby increasing the flow rate of gas ejected from the jet nozzle to the outer circumferential surface of the fish skin collagen casing 9. If the frequency of the piston 52 reciprocating in the left-right direction within the piston cylinder 51 decreases, the frequency of air intake at the right end of the air supply pipe 42, the frequency of gas pumping into the right side of the air supply pipe 42, and the frequency of gas pumping into the air delivery pipe 32 will increase simultaneously. The frequency of gas being drawn into the right side of the inner cavity of piston cylinder 51 and the frequency of gas being pumped into the gas delivery pipe 32 in the right side of the inner cavity of piston cylinder 51 are reduced synchronously, so that the flow rate of gas pumped along the gas delivery pipe 32 to the jet nozzle on the inner peripheral wall of the right half of the horizontal cylinder 12 is reduced, thereby reducing the flow rate of gas ejected from the jet nozzle to the outer peripheral surface of the fish skin collagen casing 9; thus, the flow rate of gas ejected to the outer peripheral surface of the fish skin collagen casing 9 can be automatically adjusted according to the conveying speed of the fish skin collagen casing 9, so that the flow rate of gas ejected to the outer peripheral surface of the fish skin collagen casing 9 is adapted to the conveying speed of the fish skin collagen casing 9.

[0021] This invention can spray a cross-linking modified liquid onto the outer surface of a fish skin collagen casing 9 and then dry it. It can also automatically adjust the flow rate of the liquid sprayed onto the outer surface of the fish skin collagen casing 9 according to the conveying speed of the casing, ensuring that the flow rate is compatible with the conveying speed. Furthermore, it can automatically adjust the flow rate of the gas sprayed onto the outer surface of the fish skin collagen casing 9 according to the conveying speed, ensuring that the flow rate is compatible with the conveying speed.

[0022] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing fish skin collagen casings, comprising using descaled fish skin to prepare fish skin collagen casings, and using a spray drying device to spray a cross-linking modification liquid onto the outer surface of the fish skin collagen casings and then drying them; characterized in that: The spray drying device includes: a left conveying roller, a horizontal cylinder, and a right conveying roller arranged sequentially from left to right; the roller shafts of the left and right conveying rollers are horizontally positioned along the front-to-back direction; the horizontal cylinder is horizontally positioned along the left-to-right direction; spray nozzles are evenly distributed on the inner circumferential wall of the left half of the horizontal cylinder, and a vertically positioned liquid delivery pipe is connected to the left end of the horizontal cylinder; an internal liquid delivery channel connecting each spray nozzle to the liquid delivery pipe is provided inside the cylinder wall of the left half of the horizontal cylinder; air jet nozzles are evenly distributed on the inner circumferential wall of the right half of the horizontal cylinder, and a vertically positioned air delivery pipe is connected to the right end of the horizontal cylinder; an internal air delivery channel connecting each air jet nozzle to the air delivery pipe is provided inside the cylinder wall of the right half of the horizontal cylinder; the liquid delivery pipe... The bottom end of the tube is connected to a horizontally positioned liquid replenishment pipe, and the bottom end of the gas supply pipe is connected to a horizontally positioned gas replenishment pipe. Both the liquid replenishment pipe and the gas replenishment pipe are located below the horizontal cylinder. A horizontally positioned piston cylinder is also provided between the liquid replenishment pipe and the gas replenishment pipe. The left end of the piston cylinder is sealed to the right end of the liquid replenishment pipe, and the right end of the piston cylinder is sealed to the left end of the gas replenishment pipe. A piston is provided in the piston cylinder, and a first magnetic block is built into the piston. A horizontally positioned sliding groove is provided on the outer wall of the piston cylinder. A slider that slides in the sliding groove is provided in the sliding groove, and a second magnetic block is built into the slider. The second magnetic block and the first magnetic block... The magnetic blocks attract each other, and the slider can drive the piston to move left and right in the piston cylinder through the mutual attraction between the second and first magnetic blocks. The slider and the roller shaft of the left conveying roller are at the same height. A crank that is horizontally placed in the left-right direction is fixed to the front end of the roller shaft of the left conveying roller. The right end of the crank is hinged to the left end of a connecting rod that is horizontally placed in the left-right direction. The right end of the connecting rod is hinged to the left end of a push-pull rod that is horizontally placed in the left-right direction. The right end of the push-pull rod is fixed to the left side wall of the slider. An infusion valve is provided on the infusion tube. An air valve is provided on the gas infusion tube. An infusion valve is provided on the replenishment tube, and the replenishment valve is located on the left side of the infusion tube. The pipe is equipped with a gas replenishment valve, which is located on the right side of the gas supply pipe. The infusion valve, gas supply valve, liquid replenishment valve, and gas replenishment valve are all one-way valves. The liquid supply valve only allows liquid in the infusion pipe to flow from bottom to top, the gas supply valve only allows gas in the gas supply pipe to flow from bottom to top, the liquid replenishment valve only allows liquid in the liquid replenishment pipe to flow from left to right, and the gas replenishment valve only allows gas in the gas replenishment pipe to flow from right to left. The left end of the liquid replenishment pipe is connected to a liquid supply device, which can supply crosslinked modified liquid to the liquid replenishment pipe. The right end of the gas replenishment pipe is open, and an air heating device is also provided on the gas replenishment pipe, which is located on the right side of the gas replenishment valve. The frequency of extracting the crosslinking modification liquid, spraying the crosslinking modification liquid onto the outer surface of the fish skin collagen casing, extracting air, and spraying air onto the outer surface of the fish skin collagen casing are adjusted according to the rotation frequency of the conveying rollers that transport the fish skin collagen casing. This ensures that the flow rate of the crosslinking modification liquid sprayed onto the outer surface of the fish skin collagen casing and the flow rate of the air sprayed onto the outer surface of the fish skin collagen casing are adapted to the conveying speed of the fish skin collagen casing.

2. The method for preparing fish skin collagen casing according to claim 1, characterized in that, The crosslinking modified liquid contains glycerol and glutaraldehyde.

3. The method for preparing fish skin collagen casing according to claim 1, characterized in that, The liquid replenishment tube and the gas replenishment tube are coaxial.

4. The method for preparing fish skin collagen casing according to claim 3, characterized in that, The groove is a through groove.

5. The method for preparing fish skin collagen casing according to claim 4, characterized in that, The infusion valve is located near the replenishment tube.

6. The method for preparing fish skin collagen casing according to claim 5, characterized in that, The gas supply valve is located near the gas supply pipe.

7. The method for preparing fish skin collagen casing according to claim 6, characterized in that, The replenishment valve is located near the infusion tube.

8. The method for preparing fish skin collagen casing according to claim 7, characterized in that, The gas supply valve is located near the gas delivery pipe.

9. The method for preparing fish skin collagen casing according to claim 8, characterized in that, The process of spraying a cross-linking modified liquid onto the outer surface of fish skin collagen casings using a spray drying device and then drying it includes the following steps: The fish skin collagen casing is conveyed from left to right by the left and right conveying rollers and passes through the horizontal cylinder; during the conveying process of the fish skin collagen casing from left to right, the rotating left conveying roller drives the slider to move back and forth in the left and right direction through the crank, connecting rod and push-pull rod. The slider drives the piston to move back and forth synchronously in the left and right direction in the piston cylinder through the mutual attraction between the second magnetic block and the first magnetic block; the area of ​​the piston cylinder cavity located on the left side of the piston is the left area of ​​the piston cylinder cavity, and the area of ​​the piston cylinder cavity located on the right side of the piston is the right area of ​​the piston cylinder cavity. The liquid supply device supplies crosslinking modified liquid to the replenishment pipe; Each time the piston moves from left to right in the piston cylinder, it draws the liquid in the replenishment tube into the left side of the piston cylinder cavity; each time the piston moves from right to left in the piston cylinder, it pumps the liquid in the left side of the piston cylinder cavity into the infusion tube, which in turn pumps the liquid along the infusion tube to the spray nozzle on the inner wall of the left half of the horizontal cylinder, and the liquid is sprayed from the spray nozzle onto the outer surface of the fish skin collagen casing that passes through the left half of the horizontal cylinder, thus spraying the cross-linking modified liquid onto the outer surface of the fish skin collagen casing. The air heating device heats the air drawn in from the right end of the air supply pipe; each time the piston moves from right to left in the piston cylinder, it draws in air from the right end of the air supply pipe and draws the gas in the air supply pipe into the right side area of ​​the piston cylinder cavity; each time the piston moves from left to right in the piston cylinder, it pumps the gas in the right side area of ​​the piston cylinder cavity into the air delivery pipe, and then pumps the gas along the air delivery pipe to the jet nozzle on the inner peripheral wall of the right half of the horizontal cylinder, and the gas is ejected from the jet nozzle to the outer peripheral surface of the fish skin collagen casing that passes through the right half of the horizontal cylinder, thereby drying the cross-linked modified liquid on the outer peripheral surface of the fish skin collagen casing. If the conveying speed of the fish skin collagen casing increases, the rotation speed of the left conveying roller increases, that is, the rotation frequency of the left conveying roller increases, which will cause the frequency of the piston reciprocating in the left and right direction in the piston cylinder to increase synchronously; if the conveying speed of the fish skin collagen casing decreases, the rotation speed of the left conveying roller decreases, that is, the rotation frequency of the left conveying roller decreases, which will cause the frequency of the piston reciprocating in the left and right direction in the piston cylinder to decrease synchronously. If the frequency of the piston's reciprocating movement in the piston cylinder increases, the frequency of liquid being drawn into the left side of the piston cylinder cavity from the replenishment tube and the frequency of liquid being pumped into the infusion tube from the left side of the piston cylinder cavity will increase simultaneously. This increases the flow rate of liquid pumped along the infusion tube to the nozzle on the inner wall of the left half of the horizontal cylinder, and consequently increases the flow rate of liquid sprayed from the nozzle onto the outer surface of the fish skin collagen casing. Conversely, if the frequency of the piston's reciprocating movement in the piston cylinder decreases, the frequency of liquid being drawn into the left side of the piston cylinder cavity from the replenishment tube and the frequency of liquid being pumped into the infusion tube from the left side of the piston cylinder cavity will decrease simultaneously. This decreases the flow rate of liquid pumped along the infusion tube to the nozzle on the inner wall of the left half of the horizontal cylinder, and consequently decreases the flow rate of liquid sprayed from the nozzle onto the outer surface of the fish skin collagen casing. Therefore, the flow rate of liquid sprayed onto the outer surface of the fish skin collagen casing can be automatically adjusted according to the conveying speed of the fish skin collagen casing. If the frequency of the piston's reciprocating movement in the piston cylinder increases, the frequency of air intake at the right end of the air supply pipe, gas drawn into the right side of the piston cylinder cavity from the air supply pipe, and gas pumped into the air supply pipe from the right side of the piston cylinder cavity will all increase simultaneously. This will increase the flow rate of gas pumped along the air supply pipe to the jet nozzle on the inner wall of the right half of the horizontal cylinder, and consequently increase the flow rate of gas ejected from the jet nozzle to the outer surface of the fish skin collagen casing. Conversely, if the frequency of the piston's reciprocating movement in the piston cylinder decreases, the frequency of air intake at the right end of the air supply pipe, gas drawn into the right side of the piston cylinder cavity from the air supply pipe, and gas pumped into the air supply pipe from the right side of the piston cylinder cavity will all decrease simultaneously. This will decrease the flow rate of gas pumped along the air supply pipe to the jet nozzle on the inner wall of the right half of the horizontal cylinder, and consequently decrease the flow rate of gas ejected from the jet nozzle to the outer surface of the fish skin collagen casing. Therefore, the flow rate of gas ejected to the outer surface of the fish skin collagen casing can be automatically adjusted according to the conveying speed of the fish skin collagen casing.

Images