Modified plastic production and processing equipment and processing technology

Abstract

The present invention relates to the technical field of processing equipment, and discloses a modified plastic production and processing equipment and a processing technology thereof. The modified plastic production and processing equipment includes a frame, a resin box and a winding device. The resin box is slidably connected to one side of the frame, and the winding device is arranged inside the frame. The resin box is movably connected to a guide shaft inside. A motor is fixedly installed on one side of the resin box. The output end of the motor is fixedly connected to one end of the guide shaft. A groove is provided on the outside of the guide shaft, and a liquid storage tank is provided at the bottom of the guide shaft. The modified plastic production and processing equipment and its processing technology can replenish the contact part when the glass fiber contacts the guide roller, so that the bottom of the glass fiber coated with liquid resin will not be rubbed off by the liquid resin due to contact with the guide shaft, so that the glass fiber coated on its surface is more uniform and the coating effect is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of processing equipment, in particular to modified plastic production and processing equipment and a processing technology thereof. Background Art

[0002] Modified plastics refer to plastic products that are modified by filling, blending, and reinforcing general-purpose and engineering plastics to improve their flame retardancy, strength, impact resistance, and toughness. Mine ventilation pipes are pipes used to introduce fresh air into mines, increasing oxygen concentration and diluting and removing toxic and harmful gases and dust from the mines. The basic tasks of mine ventilation are to: supply sufficient fresh air underground to meet personnel's oxygen needs; dilute harmful gases and dust underground to ensure safe production; and regulate the underground climate to create a good working environment. Existing mine ventilation pipes guide the resin-coated glass fibers out of the resin box during the process of winding the glass fibers onto the circular tubes. During the guidance process, the contact between the glass fibers and the guide rollers causes the resin coating on the surface to rub against them, resulting in the resin being wiped off. This results in uneven resin distribution when the glass fibers are subsequently wound onto the circular tubes, resulting in poor winding quality. In areas with less resin, the wound glass fibers become loose, affecting the ventilation pipe's yield rate. Summary of the Invention

[0003] The present invention provides a modified plastic production and processing equipment and a processing technology thereof, which has the beneficial effect of replenishing resin when guiding glass fibers, and solves the problem mentioned in the above background technology that the existing mine ventilation pipe will guide the glass fibers coated with resin out of the resin box during the process of guiding the glass fibers to be wound onto the round tube. During the guiding process, the contact between the glass fibers and the guide roller will cause the resin coated on the surface to be rubbed, and then cause the resin to be erased, so that the resin is unevenly distributed when the subsequent glass fibers are wound on the round tube. The winding effect of the unevenly distributed glass fibers is poor, and the wound glass fibers will be loose in places with less resin, affecting the yield rate of the ventilation pipe.

[0004] The present invention provides the following technical solution: a modified plastic production and processing equipment and a processing technology thereof, comprising a frame, a resin box and a winding device, the resin box being slidably connected to one side of the frame, the winding device being arranged inside the frame, the resin box being movably connected to a guide shaft inside, a motor being fixedly installed on one side of the resin box, the output end of the motor being fixedly connected to one end of the guide shaft, a groove being provided on the outside of the guide shaft, a liquid storage tank being provided at the bottom of the guide shaft, the liquid storage tank being fixedly connected to the resin box, an extrusion plate being slidably connected to the inside of the groove, an extrusion mechanism being fixedly connected to one side of the extrusion plate, and the extrusion mechanism being capable of driving the extrusion plate to slide in the groove.

[0005] As an optional solution for the modified plastic production and processing equipment and its processing technology described in the present invention, the extrusion mechanism includes a first transmission plate, one side of the first transmission plate is slidably connected to the second transmission plate, the second transmission plate is slidably connected to the guide shaft, one side of the second transmission plate is fixedly connected to the third transmission plate, one side of the third transmission plate is slidably connected to the first resistance plate, one end of the first resistance plate is fixedly connected to the inner wall of the resin box, the other side of the third transmission plate is fixedly connected to the first spring, and one end of the first spring is fixedly connected to the guide shaft.

[0006] The adjusting gear is meshed with an adjusting gear, and one end of the adjusting gear is meshed with an adjusting gear plate, and the other end of the adjusting gear plate is slideably connected to the guide shaft of the guide shaft. One end of the adjusting gear plate extends to one end of the guide shaft, and the end of the adjusting gear plate is fixedly connected to a ramp plate, and one side of the inner wall of the resin box is fixedly connected to a second contact plate, and the number of the second contact plates is several, and the several second contact plates are equidistantly distributed in a ring, one of the second contact plates contacts the ramp plate, and the outer side of the adjusting gear plate is sleeved with a second spring, one end of the second spring is fixedly connected to the ramp plate, and the other end of the second spring is fixedly connected to the guide shaft.

[0007] As an optional solution for the modified plastic production and processing equipment and its processing technology described in the present invention, the other end of the guide shaft is fixedly connected to a protrusion, the number of the protrusions is several, and the protrusions are evenly distributed in a ring shape, and the top of the resin box is slidably connected to a scraper.

[0008] As an optional solution of the modified plastic production and processing equipment and the processing technology thereof of the present invention, one side of the scraper is fixedly connected to a fourth transmission plate, and one side of the fourth transmission plate abuts against one of the protrusions.

[0009] As an optional solution for the modified plastic production and processing equipment and its processing technology described in the present invention, one side of the inner wall of the resin box is fixedly connected to a connecting frame, one side of the connecting frame is fixedly connected to a third spring, and one end of the third spring is fixedly connected to the fourth transmission plate.

[0010] As an optional solution for the modified plastic production and processing equipment and its processing technology described in the present invention, one side of the winding device is provided with a push-pull mechanism, and the push-pull mechanism includes a hydraulic cylinder, one side of the hydraulic cylinder is fixedly connected to the frame, the output end of the hydraulic cylinder is fixedly connected to a fixed sleeve, and one side of the winding device is fixedly connected to an extension plate.

[0011] As an optional solution for the modified plastic production and processing equipment and its processing technology described in the present invention, one side of the extension plate is movably connected to a clamping plate through a rotating shaft, and a pin is provided on one side of the fixed sleeve, and one end of the pin passes through the fixed sleeve and the clamping plate and extends to one side of the fixed sleeve.

[0012] As an optional solution for the modified plastic production and processing equipment and its processing technology described in the present invention, one end of the extension plate is fixedly connected to a base plate, one side of the base plate is fixedly connected to a fourth spring, and one end of the fourth spring is in close contact with the fixed sleeve.

[0013] As an optional solution of the modified plastic production and processing equipment and the processing technology thereof of the present invention, the following steps are included:

[0014] S1. A worker wraps plastic film around a steel shaft in a winding device to prevent the fiberglass from sticking to the shaft. Then, he wraps cardboard around one end of the shaft to increase its diameter.

[0015] S2. Use a textile machine to introduce several strands of glass fiber into a resin tank and immerse them in resin for dyeing. Then, they are spirally wound around a circular shaft to form a circular tube ranging from three to ten millimeters. The specific thickness of the tube will be determined according to the actual application.

[0016] S3. When the fiberglass winding is completed, the round tube is sent into a hot furnace for cooling. After 30 minutes, the resin is completely hardened. The worker removes the round shaft and cuts the fiberglass round tube from the middle to make short tubes of the same length. The round tube is then cut into the specified size and shape with a handheld cutting machine. The two parts are then connected together and the gap is filled with resin-coated fiberglass material to make a fiberglass ventilation duct.

[0017] The present invention has the following beneficial effects:

[0018] 1. The modified plastic production and processing equipment and its processing technology are provided with a guide shaft, a groove, a liquid storage tank, an extrusion plate and an extrusion mechanism. As the groove on the surface of the guide shaft rotates to the top, the extrusion plate will move upward to push out part of the liquid resin stored in the groove. The liquid resin pushed upward will contact the bottom of the glass fiber passing over the top, achieving the effect of replenishing the liquid at the bottom of the glass fiber, so that the bottom of the glass fiber coated with liquid resin will not be rubbed off due to contact with the guide shaft, so that the glass fiber coated on its surface is more uniform and the coating effect is maintained.

[0019] 2. The modified plastic production and processing equipment and its processing technology are characterized by providing a connecting column and a stirring rod. When the guide shaft rotates, the connecting column drives the stirring rod to rotate. After the stirring rod rotates, it can stir the liquid resin in the groove. After the liquid resin is stirred, it will facilitate the discharge of gas in the groove, prevent the gas from accumulating in the groove, and affect the subsequent rehydration of the glass fiber, thereby improving the practicality of the glass fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the resin box of the present invention.

[0022] Figure 3 It is a schematic diagram of the partial three-dimensional structure of the guide shaft of the present invention.

[0023] Figure 4 It is a schematic diagram of the partial cross-sectional three-dimensional structure of the guide shaft of the present invention.

[0024] Figure 5 It is a schematic diagram of the partial three-dimensional structure of the guide shaft of the present invention.

[0025] Figure 6 It is a schematic diagram of the partial cross-sectional three-dimensional structure of the guide shaft of the present invention.

[0026] Figure 7 It is a structural schematic diagram of the hydraulic cylinder of the present invention.

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the fixing sleeve of the present invention.

[0028] In the figure: 1. frame; 2. resin box; 3. winding device; 4. guide shaft; 5. motor; 6. groove; 7. liquid storage tank; 8. extrusion plate; 901. first transmission plate; 902. second transmission plate; 903. third transmission plate; 904. first contact plate; 905. first spring; 10. opening slot; 11. connecting column; 12. stirring rod; 13. adjusting gear; 14. adjusting tooth plate; 15. ramp plate; 16. second contact plate; 17. second spring; 18. bump; 19. scraper; 20. fourth transmission plate; 21. connecting frame; 22. third spring; 2301. hydraulic cylinder; 2302. fixing sleeve; 2303. extension plate; 2304. clamping plate; 2305. latch; 24. base plate; 25. fourth spring. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1

[0031] See also Figures 1 to 8 , a modified plastic production and processing equipment, including a frame 1, a resin box 2 and a winding device 3, the resin box 2 is slidably connected to the front side of the frame 1, liquid resin is injected into the resin box 2, the winding device 3 is arranged inside the frame 1, and a roller is provided at the bottom of the winding device 3, which can be moved on the ground. The winding device 3 is composed of a frame 1, a motor and a roller frame, the motor is fixedly connected to one side of the frame 1, the roller frame is fixedly connected to the output end of the motor, and the roller frame is rotatably connected to the frame 1, and a guide shaft 4 is movably connected inside the resin box 2, a motor 5 is fixedly installed on one side of the resin box 2, the output end of the motor 5 is fixedly connected to one end of the guide shaft 4, a groove 6 is provided on the outside of the guide shaft 4, and a liquid storage tank 7 is provided at the bottom of the guide shaft 4, liquid resin is injected into the liquid storage tank 7, and the liquid storage tank 7 is fixedly connected to the resin box 2, and an extrusion plate 8 is slidably connected inside the groove 6, and an extrusion mechanism is fixedly connected to one side of the extrusion plate 8. The extrusion mechanism can drive the extrusion plate 8 to slide in the groove 6.

[0032] The extrusion mechanism includes a first transmission plate 901, the extrusion plate 8 is fixedly connected to the first transmission plate 901, one side of the first transmission plate 901 is slidably connected to the second transmission plate 902, the second transmission plate 902 is slidably connected to the guide shaft 4, one side of the second transmission plate 902 is fixedly connected to the third transmission plate 903, one side of the third transmission plate 903 is slidably connected to the first resistance plate 904, one end of the first resistance plate 904 is fixedly connected to the inner wall of the resin box 2, the other side of the third transmission plate 903 is fixedly connected to the first spring 905, one end of the first spring 905 is fixedly connected to the guide shaft 4.

[0033] The working principle of this embodiment is as follows: when using the winding device 3 to wind the glass fiber, first manually tie one end of the glass fiber to the roller frame of the winding device 3, then start the winding device 3 to make the winding device 3 wind the glass fiber. When winding the glass fiber, the glass fiber will pass through the resin box 2, and the resin box 2 is injected with liquid resin. A large amount of resin will adhere to the surface of the glass fiber when passing through the resin box 2. Then the glass fiber is pulled by the winding device 3, and when it is guided by the guide shaft 4, the motor 5 drives the guide shaft 4 to rotate, which will cause the guide shaft 4 to rotate. After the guide shaft 4 rotates, one of the grooves 6 opened on the outside will store part of the liquid resin in the liquid storage tank 7 when it rotates to the bottom. When the groove 6 rotates to the top of the guide shaft 4, the third transmission plate 903 will contact the resin box 2. The first resistance plate 904 of the side wall resists and is pushed to the left by the first resistance plate 904. After the third transmission plate 903 moves to the left, it will push the second transmission plate 902 to move to the left. After the second transmission plate 902 moves to the left, it will push the first transmission plate 901 to move upward. The first transmission plate 901 will drive the extrusion plate 8 in the groove 6 to move outward. After the extrusion plate 8 moves upward, it will push part of the liquid resin stored in the groove 6 upward. The liquid resin pushed upward will contact the bottom of the glass fiber passing through the top, achieving the effect of replenishing the liquid to the bottom of the glass fiber, so that the bottom of the glass fiber coated with liquid resin will not be rubbed off due to contact with the guide shaft 4, so that the glass fiber coated on its surface is more uniform and the coating effect is maintained.

[0034] Example 2

[0035] This embodiment is an improvement made on the basis of the embodiment. For details, please refer to Figures 1 to 8The outer side of the adjusting tooth plate 14 is provided with a second spring 17, one end of the second spring 17 is fixedly connected to the ramp plate 15, and the other end of the second spring 17 is fixedly connected to the guide shaft 4.

[0036] Eliminate bubbles in the resin: When the guide shaft 4 rotates through the groove 6 to bring out the liquid resin in the liquid storage tank 7, due to the fast rotation of the guide shaft 4, when the liquid resin enters the groove 6, air is also likely to enter the groove 6. After the air enters the groove 6, it is not only easy to affect the amount of liquid resin entering the groove 6, but also easy to cause bubbles to form in the liquid resin, affecting the yield rate of the ventilation pipe. By setting the connecting column 11 and the stirring rod 12, when the guide shaft 4 rotates, the ramp plate 15 on the left side of the guide shaft 4 and the left side of the inner wall of the resin box 2 are annularly equidistantly distributed. The two contact plates 16 collide with each other, and the ramp plate 15 will be pushed to the right by the second contact plate 16 after the collision. Then the ramp plate 15 will drive the adjusting tooth plate 14 to move to the right. After the adjusting tooth plate 14 moves, it pushes the adjusting gear 13 to rotate. After the adjusting gear 13 rotates, it drives the connecting column 11 to rotate. The connecting column 11 drives the stirring rod 12 to rotate. After the stirring rod 12 rotates, it can stir the liquid resin in the groove 6. After the liquid resin is stirred, it will facilitate the discharge of the gas in the groove 6, prevent the gas from accumulating in the groove 6, and affect the subsequent rehydration of the glass fiber, thereby improving the practicality of the glass fiber.

[0037] The other end of the guide shaft 4 is fixedly connected with a plurality of protrusions 18 , which are evenly distributed in a ring shape. A scraper 19 is slidably connected to the top of the resin box 2 .

[0038] One side of the scraper 19 is fixedly connected to the fourth transmission plate 20 , and one side of the fourth transmission plate 20 is in contact with one of the protrusions 18 .

[0039] A connecting frame 21 is fixedly connected to the other side of the inner wall of the resin box 2 . A third spring 22 is fixedly connected to one side of the connecting frame 21 . One end of the third spring 22 is fixedly connected to the fourth transmission plate 20 .

[0040] After the guide shaft 4 rotates, the bottom of the glass fiber can be replenished with liquid through the groove 6 and the extrusion plate 8, and a large amount of liquid resin will gush out during the replenishment. This replenishment will not only cause the resin in some areas of the bottom of the glass fiber to be thicker and in some areas to be thinner, but will also cause the glass fiber to drip resin in the process of moving to the winding device 3 later. By providing a protrusion 18 and a scraper 19, the scraper 19 is located at the bottom of the glass fiber, which can flatten the bottom of the glass fiber after replenishment, so that the resin distribution is more uniform. As the guide shaft 4 rotates, the guide shaft 4 will drive the protrusion 18 to rotate. When the protrusion 18 rotates, it will continuously push the fourth transmission plate 20 to move to the right. After the fourth transmission plate 20 moves to the right, it will reset to the left under the elastic force of the third spring 22 and be pushed to the right by the next protrusion 18. This cycle is repeated, so that the fourth transmission plate 20 can drive the scraper 19 to move left and right continuously. The left and right movement of the scraper 19 can make the resin at the bottom of the glass fiber be scraped back and forth, further making the liquid resin distribution more uniform and improving the coating effect of the glass fiber resin.

[0041] A push-pull mechanism is provided on one side of the winding device 3, and the push-pull mechanism includes a hydraulic cylinder 2301. One side of the hydraulic cylinder 2301 is fixedly connected to the frame 1, and the output end of the hydraulic cylinder 2301 is fixedly connected to the fixed sleeve 2302. One side of the winding device 3 is fixedly connected to the extension plate 2303.

[0042] When the clamping plate 2304 is folded back into the inner part of the extension plate 2303, the winding device 3 can be manually pushed to move forward and backward through the rollers at the bottom, thereby improving the convenience of using the winding device 3.

[0043] By setting up a push-pull mechanism, after starting the hydraulic cylinder 2301, the winding device 3 can be driven to move toward the side close to the resin box 2, thereby reducing the distance between the winding device 3 and the resin box 2. After the latch 2305 is taken out from the inside of the fixed sleeve 2302, it slides downward with the rotating shaft of the extension plate 2303 as the center, and then the frame 1 can move freely. When installation is required, the clamping plate 2304 can be connected to the fixed sleeve 2302 through the latch 2305. When the hydraulic cylinder 2301 starts to retract, it can drive the winding device 3 to reset, so as to increase the distance between the resin box 2 and the winding device 3. The hydraulic cylinder 2301 can drive the winding device 3 to move back and forth over a short distance to adjust the distance between the resin box 2 and the winding device 3, which can improve the applicability of the winding device 3 and can adjust the distance between the winding device 3 and the resin box 2 according to the on-site conditions.

[0044] One end of the extension plate 2303 is fixedly connected to the base plate 24 , one side of the base plate 24 is fixedly connected to the fourth spring 25 , and one end of the fourth spring 25 is in close contact with the fixing sleeve 2302 .

[0045] By setting the base plate 24 and the fourth spring 25, the base plate 24 fixes the fourth spring 25 on the extension plate 2303, and the fourth spring 25 applies spring force to the fixing sleeve 2302, and indirectly applies elastic force to the clamping plate 2304 through the fixing sleeve 2302, so that the clamping plate 2304 and the internal pin 2305 are more tightly connected to prevent the pin 2305 from falling off.

[0046] See also Figures 1 to 8 , the processing technology of modified plastic production and processing equipment includes the following steps:

[0047] S1. A worker wraps a plastic film around the steel shaft of winding device 3. The film prevents the glass fiber from sticking to the shaft. Then, a cardboard is wrapped around one end of the shaft to increase its diameter.

[0048] S2. Using a textile machine, several strands of glass fiber are introduced into a resin tank 2 and immersed in resin for dyeing. They are then spirally wound around a circular shaft to form a tube ranging from three to ten millimeters, the specific thickness of which will be determined according to the actual application;

[0049] S3. When the fiberglass winding is completed, the round tube is sent into a hot furnace for cooling. After 30 minutes, the resin is completely hardened. The worker removes the round shaft and cuts the fiberglass round tube from the middle to make short tubes of the same length. The round tube is then cut into the specified size and shape with a handheld cutting machine. The two parts are then connected together and the gap is filled with resin-coated fiberglass material to make a fiberglass ventilation duct.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A modified plastic production and processing equipment, comprising a frame, a resin box and a winding device, wherein the resin box is slidably connected to one side of the frame, and the winding device is arranged inside the frame, characterized in that: The resin box is movably connected to a guide shaft inside, a motor is fixedly installed on one side of the resin box, an output end of the motor is fixedly connected to one end of the guide shaft, a groove is provided on the outside of the guide shaft, a liquid storage tank is provided at the bottom of the guide shaft, the liquid storage tank is fixedly connected to the resin box, an extrusion plate is slidably connected to the inside of the groove, an extrusion mechanism is fixedly connected to one side of the extrusion plate, and the extrusion mechanism can drive the extrusion plate to slide in the groove; The extrusion mechanism includes a first transmission plate, a second transmission plate being slidably connected to one side of the first transmission plate, the second transmission plate being slidably connected to a guide shaft, a third transmission plate being fixedly connected to one side of the second transmission plate, a first interference plate being slidably connected to one side of the third transmission plate, one end of the first interference plate being fixedly connected to an inner wall of the resin box, and a first spring being fixedly connected to the other side of the third transmission plate, one end of the first spring being fixedly connected to the guide shaft; The outer wall of the adjusting plate is fixed with a gear which is fixed to the guide rail, and the outer wall of the adjusting plate is fixed with a gear which is engaged with the gear of the adjusting member and the gear is connected with the gear of the adjusting member to form a rotation.

2. The modified plastic production and processing equipment according to claim 1, characterized in that: The other end of the guide shaft is fixedly connected with a convex block, the number of the convex blocks is several, and the convex blocks are distributed in a ring shape with equal distances, and the top of the resin box is slidably connected with a scraper.

3. The modified plastic production and processing equipment according to claim 2, characterized in that: One side of the scraper is fixedly connected to a fourth transmission plate, and one side of the fourth transmission plate abuts against one of the protrusions.

4. The modified plastic production and processing equipment according to claim 3, characterized in that: A connecting frame is fixedly connected to the other side of the inner wall of the resin box, a third spring is fixedly connected to one side of the connecting frame, and one end of the third spring is fixedly connected to the fourth transmission plate.

5. The modified plastic production and processing equipment according to claim 4, characterized in that: A push-pull mechanism is provided on one side of the winding device, and the push-pull mechanism includes a hydraulic cylinder. One side of the hydraulic cylinder is fixedly connected to the frame, the output end of the hydraulic cylinder is fixedly connected to a fixing sleeve, and one side of the winding device is fixedly connected to an extension plate.

6. The modified plastic production and processing equipment according to claim 5, characterized in that: One side of the extension plate is movably connected to a clamping plate via a rotating shaft, and one side of the fixing sleeve is provided with a latch, one end of the latch passes through the fixing sleeve and the clamping plate and extends to one side of the fixing sleeve.

7. The modified plastic production and processing equipment according to claim 6, characterized in that: One end of the extension plate is fixedly connected to the base plate, one side of the base plate is fixedly connected to the fourth spring, and one end of the fourth spring is in close contact with the fixing sleeve.

8. The process for producing and processing modified plastics according to any one of the preceding claims, characterized in that: The following steps are involved: S1. A worker wraps plastic film around a steel shaft in a winding device to prevent the fiberglass from sticking to the shaft. Then, he wraps cardboard around one end of the shaft to increase its diameter. S2. Using a textile machine, several strands of glass fiber are introduced into a resin tank and immersed in the resin for dyeing. They are then spirally wound around a shaft to form a tube with a thickness of three to ten millimeters, with the specific thickness depending on the application. S3. When the fiberglass winding is completed, the round tube is sent into a hot furnace for cooling. After 30 minutes, the resin is completely hardened. The worker removes the round shaft and cuts the fiberglass round tube from the middle to make short tubes of the same length. The round tube is then cut into the specified size and shape with a handheld cutting machine. The two parts are then connected together and the gap is filled with resin-coated fiberglass material to make a fiberglass ventilation duct.

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