Degradable biological film production equipment and method thereof
By using a dual-loop countercurrent heat exchange design and a cooling roller in the rotary assembly, the problem of uneven film thickness during the cooling process was solved, achieving uniformity of film thickness and consistency of cooling rate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-21
- Publication Date
- 2026-04-21
AI Technical Summary
During the cooling process, the axial temperature gradient caused by the temperature rise of the coolant in the biodegradable biofilm results in differences in the lateral cooling and curing rate of the film, affecting the uniformity of the product thickness.
The cooling roller adopts a dual-loop countercurrent heat exchange design, in which two streams of cooling water flow in opposite directions within the cooling roller and are accelerated to communicate through the bridging channel and the impeller assembly, thereby reducing the temperature difference on the surface of the cooling roller.
It significantly reduces the temperature difference on the surface of the cooling roller, improving the thickness uniformity and cooling rate consistency of the film products.
Smart Images
Figure CN121893448A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of thin film production technology, and in particular to a biodegradable biofilm production equipment and method. Background Technology
[0002] Biodegradable biofilms are a new type of environmentally friendly material made from natural polymers. They possess the flexibility and insulating properties of traditional plastics, but can be completely decomposed into water and carbon dioxide by microorganisms under specific composting conditions, returning to nature. This type of film effectively solves the problem of "white pollution" from plastic products and is widely used in food packaging, agricultural mulching, and the medical field. It is an important green product for promoting sustainable development, balancing practical needs with ecological protection.
[0003] Currently, the production process of biodegradable biofilms mainly includes: first, mixing raw materials and additives; then, melt blending and extruding through a twin-screw extruder; next, feeding the molten material into a casting extruder, where it is uniformly extruded through a T-die slit onto a cooling roller to complete cooling and shaping into a film; then, trimming and corona treatment of the film, and passing it through a high-voltage electric field to improve its surface properties; finally, drawing and winding to obtain the finished casting film.
[0004] During operation, the coolant flows into the cooling roller from one axial end and continuously exchanges heat with the roller wall as it flows through the inner cavity of the roller, absorbing the heat transferred by the film. This process causes the coolant to heat up along the flow direction, forming an axial temperature gradient. This temperature gradient creates a corresponding temperature difference on the surface of the cooling roller, resulting in differences in the cooling and solidification rate of the film at different locations in the transverse direction. Since the viscosity and tensile deformation of the polymer melt are highly sensitive to temperature, this non-uniform cooling directly leads to thickness fluctuations in the film in the transverse direction, affecting the uniformity of product thickness. Summary of the Invention
[0005] To improve the uniformity of thickness in biodegradable biofilm products, this application provides a biodegradable biofilm production apparatus and method.
[0006] Firstly, the biodegradable biofilm production equipment provided in this application adopts the following technical solution: A biodegradable biofilm production device includes a mixing mechanism, a screw extruder, a casting extruder, a cooling roller, a trimming mechanism, a corona treatment mechanism, and a winding roller arranged sequentially. The cooling roller includes an inner roller body, an outer roller body, a first end cap, a second end cap, a first roller end shaft, and a second roller end shaft. The outer roller body is coaxially sleeved on the inner roller body. The first end cap is fixedly disposed at one end of the inner and outer roller bodies, and the second end cap is fixedly disposed at the other end. The first roller end shaft is disposed on the first end cap, and the second roller end shaft is disposed on the second end cap. Multiple spiral baffles are disposed on the outer side wall of the inner roller body. Multiple first spiral channels and second spiral channels are formed between them. The multiple first spiral channels and second spiral channels are arranged sequentially at intervals along the axial direction of the cooling roller. A first water inlet channel communicating with the multiple first spiral channels is provided in the first end cover and the first roller end shaft. A first water outlet channel communicating with the multiple first spiral channels is provided in the second end cover and the second roller end shaft. A second water inlet channel communicating with the multiple second spiral channels is provided in the second end cover and the second roller end shaft. A second water outlet channel communicating with the multiple second spiral channels is provided in the first end cover and the first roller end shaft. The flow direction of the coolant in the first spiral channels and the second spiral channels is opposite.
[0007] By adopting the above technical solution, in the process of producing biodegradable biofilm, the first stream of cooling water enters the first spiral flow channel from the first inlet channel and then flows out from the first outlet channel, while the second stream of cooling water enters the second spiral flow channel from the second inlet channel and then flows out from the second outlet channel. The two streams of cooling water flow in opposite directions within the cooling roller, thereby reducing the temperature difference on the surface of the cooling roller and improving the uniformity of the thickness of the biodegradable biofilm product.
[0008] Preferably, each of the spiral baffles is provided with a plurality of bridging channels spaced apart along its own spiral direction, and the two ends of each bridging channel are respectively connected to the first spiral channel and the second spiral channel.
[0009] By adopting the above technical solution, when the two streams of cooling water flow in the first spiral flow channel and the second spiral flow channel, the cooling water can be interconnected in the first spiral flow channel and the second spiral flow channel through the bridging flow channel, thereby reducing the temperature difference between the first spiral flow channel and the second spiral flow channel, and further reducing the temperature difference on the surface of the cooling roller.
[0010] Preferably, the spiral baffle is provided with a rotating wheel assembly in the bridging flow channel. The two streams of coolant in the first spiral flow channel and the second spiral flow channel drive the rotating wheel assembly to rotate. The rotation of the rotating wheel assembly accelerates and drives the coolant in the first spiral flow channel and the second spiral flow channel to communicate with each other.
[0011] By adopting the above technical solution, when the two streams of coolant flow in the first spiral channel and the second spiral channel, the two streams of coolant flow in opposite directions, which enables the two streams of coolant to drive the rotating wheel assembly to rotate in one direction. During the rotation of the rotating wheel assembly, the mutual flow speed of the two streams of coolant is accelerated, thereby further reducing the temperature difference between the first spiral channel and the second spiral channel.
[0012] Preferably, the impeller assembly includes a fixed shaft, an impeller body, and multiple rotating blades. The fixed shaft is fixedly disposed within the bridging channel of the spiral baffle, the impeller body is rotatably disposed on the fixed shaft, and the multiple rotating blades are fixedly disposed at equal intervals along the circumference of the impeller body on the outer side wall of the impeller body.
[0013] By adopting the above technical solution, during the flow of coolant, the rotating blades drive the impeller body to rotate on the fixed shaft. During the rotation of the impeller body, the rotating blades are driven to rotate between the first spiral flow channel and the second spiral flow channel. During the rotation of the rotating blades, the two streams of coolant in the first spiral flow channel and the second spiral flow channel can be interconnected.
[0014] Preferably, a first rotating wheel is fixedly disposed on the top wall of the rotating wheel body, and a first cavity is formed inside the first rotating wheel. A first cam is fixedly disposed on the fixed shaft and is located inside the first cavity. A first sliding blade is slidably disposed on the first rotating wheel along its own radial direction. A first sliding groove is formed on the outer side wall of the first cam. A first slider is fixedly disposed at the end of the first sliding blade and is slidably disposed in the first sliding groove. Multiple first sliding blades are evenly spaced along the circumference of the first rotating wheel. When the first sliding blade enters the second spiral flow channel from the first spiral flow channel, the first sliding blade gradually extends out of the first rotating wheel. When the first sliding blade enters the first spiral flow channel from the second spiral flow channel, the first sliding blade gradually retracts into the first rotating wheel.
[0015] By adopting the above technical solution, the rotor body drives the first rotor to rotate. During the rotation, the first rotor drives multiple first sliding blades to slide on the first cam. When the first sliding blade enters the second spiral flow channel from the first spiral flow channel, the first sliding blade gradually extends out of the first rotor, so that the first sliding blade can carry the coolant in the first spiral flow channel into the second spiral flow channel. When the first sliding blade enters the first spiral flow channel from the second spiral flow channel, the first sliding blade gradually retracts into the first rotor, so that the first sliding blade will not carry the coolant in the second spiral flow channel into the first spiral flow channel, thus accelerating the entry of the coolant in the first spiral flow channel into the second spiral flow channel.
[0016] Preferably, a second rotating wheel is fixedly disposed on the bottom wall of the rotating wheel body, and a second cavity is formed inside the second rotating wheel. A second cam is fixedly disposed on the fixed shaft, and the second cam is located inside the second cavity. A second sliding blade is slidably disposed on the second rotating wheel along its own radial direction. A second sliding groove is formed on the outer side wall of the second cam. A second slider is fixedly disposed at the end of the second sliding blade, and the second slider is slidably disposed in the second sliding groove. Multiple second sliding blades are evenly spaced along the circumference of the second rotating wheel. When the second sliding blade enters the second spiral flow channel from the first spiral flow channel, the first sliding blade gradually retracts into the second rotating wheel. When the second sliding blade enters the first spiral flow channel from the second spiral flow channel, the second sliding blade gradually extends out of the second rotating wheel.
[0017] By adopting the above technical solution, the rotor body drives the second rotor to rotate. During the rotation, the second rotor drives multiple second sliding blades to slide on the second cam. When the second sliding blade enters the second spiral flow channel from the first spiral flow channel, the second sliding blade gradually retracts into the second rotor, so that the second sliding blade will not carry the coolant in the first spiral flow channel into the second spiral flow channel. When the second sliding blade enters the first spiral flow channel from the second spiral flow channel, the second sliding blade gradually extends out of the second rotor, so that the second sliding blade can carry the coolant in the second spiral flow channel into the first spiral flow channel, thus accelerating the entry of coolant from the second spiral flow channel into the first spiral flow channel.
[0018] Preferably, the first water inlet channel includes a first main water inlet channel and multiple first secondary water inlet channels. The first main water inlet channel is located inside the first roller end shaft, and the multiple first secondary water inlet channels are located inside the first end cover and connect the first main water inlet channel and the multiple first spiral flow channels. The first water outlet channel includes a first main water outlet channel and multiple first secondary water outlet channels. The multiple first secondary water outlet channels are located inside the second end cover and connect the multiple first spiral flow channels. The first main water outlet channel is located inside the second roller end shaft and connects the multiple first secondary water outlet channels.
[0019] By adopting the above technical solution, the first stream of coolant first enters the first spiral flow channel from the first main inlet channel and the first secondary inlet channel, and then flows out of the cooling roller from the first secondary outlet channel and the first main outlet channel.
[0020] Preferably, the second water inlet channel includes a second main water inlet channel and multiple second auxiliary water inlet channels. The second main water inlet channel is located inside the second roller end shaft, and the multiple second auxiliary water inlet channels are located inside the second end cover and connect the second main water inlet channel and the multiple second spiral flow channels. The second water outlet channel includes a second main water outlet channel and multiple second auxiliary water outlet channels. The multiple second auxiliary water outlet channels are located inside the first end cover and connect the multiple second spiral flow channels. The second main water outlet channel is located inside the first roller end shaft and connects the multiple second auxiliary water outlet channels.
[0021] By adopting the above technical solution, the second stream of coolant first enters the second spiral flow channel from the second main inlet channel and the second auxiliary inlet channel, and then flows out of the cooling roller from the second auxiliary outlet channel and the second main outlet channel.
[0022] Secondly, the biodegradable biofilm production method provided in this application adopts the following technical solution: A method for producing a biodegradable biofilm, using the aforementioned biodegradable biofilm production equipment, includes the following steps: S1: Raw materials and additives are added to a mixing mechanism in proportion, and the mixing mechanism mixes the raw materials and additives; S2: The mixed material is fed into a screw extruder for melt blending and extrusion of the melt; S3: The melt is fed into a casting extruder, and the casting extruder extrudes the melt onto a cooling roller for cooling and shaping; S4: The cooled film enters a trimming mechanism for trimming; S5: The trimmed film enters a corona treatment mechanism for corona treatment; S6: The corona-treated film is wound up on a take-up roller.
[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. Utilizing the first and second spiral flow channels, during the production of biodegradable biofilms, the first stream of cooling water enters the first spiral flow channel from the first inlet channel and then flows out from the first outlet channel, while the second stream of cooling water enters the second spiral flow channel from the second inlet channel and then flows out from the second outlet channel. The two streams of cooling water flow in opposite directions within the cooling roller, thereby reducing the temperature difference on the surface of the cooling roller and improving the uniformity of the thickness of the biodegradable biofilm product. 2. With the help of the bridging channel, when the two streams of cooling water flow in the first spiral channel and the second spiral channel, the cooling water can be interconnected in the first spiral channel and the second spiral channel through the bridging channel, thereby reducing the temperature difference between the first spiral channel and the second spiral channel, and further reducing the temperature difference on the surface of the cooling roller. 3. Through the impeller assembly, when the two streams of coolant flow in the first and second spiral channels, the two streams of coolant flow in opposite directions can drive the impeller assembly to rotate in one direction. During the rotation of the impeller assembly, the mutual flow speed of the two streams of coolant is accelerated, thereby further reducing the temperature difference between the first and second spiral channels. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of the biodegradable biofilm production equipment of this application; Figure 2 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, to highlight the cooling roller; Figure 3This is a partial structural cross-sectional view of the biodegradable biofilm production equipment of this application; Figure 4 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, highlighting the first main water inlet channel; Figure 5 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, highlighting the first water inlet auxiliary channel; Figure 6 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, highlighting the second main water inlet channel; Figure 7 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, highlighting the second water inlet auxiliary channel; Figure 8 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, to highlight the cross-connection channel; Figure 9 This is a partial structural schematic diagram of the biodegradable biofilm production equipment of this application, to highlight the rotary wheel assembly; Figure 10 This is a partially exploded cross-sectional view of the biodegradable biofilm production equipment of this application; Figure 11 This is a partial cross-sectional top view of the biodegradable biofilm production equipment of this application, to highlight the rotating state of the rotor body; Figure 12 This is a partial cross-sectional top view of the biodegradable biofilm production equipment of this application, to highlight the rotation state of the first rotor; Figure 13 This is a partial cross-sectional top view of the biodegradable biofilm production equipment of this application, to highlight the rotation of the second rotor.
[0025] Reference numerals: 1. Mixing mechanism; 2. Screw extruder; 3. Cast extruder; 4. Cooling roller; 41. Inner roller body; 42. Outer roller body; 43. First end cap; 44. Second end cap; 45. First roller end shaft; 46. Second roller end shaft; 5. Trimming mechanism; 6. Corona discharge mechanism; 7. Take-up roller; 8. Spiral baffle; 9. First spiral flow channel; 10. Second spiral flow channel; 11. First water inlet channel; 111. First main water inlet channel; 112. First secondary water inlet channel; 12. First water outlet channel; 121. First main water outlet channel; 122. First secondary water outlet channel; 13. Second water inlet channel. Channels; 131, Second main inlet channel; 132, Second auxiliary inlet channel; 14, Second outlet channel; 141, Second main outlet channel; 142, Second auxiliary outlet channel; 15, Bridging channel; 16, Rotor assembly; 161, Fixed shaft; 162, Rotor body; 163, Rotating blade; 17, First rotor; 18, First cavity; 19, First cam; 20, First sliding blade; 21, First groove; 22, First slider; 23, Second rotor; 24, Second cavity; 25, Second cam; 26, Second sliding blade; 27, Second groove; 28, Second slider. Detailed Implementation
[0026] The following is in conjunction with the appendix Figures 1-13 This application will be described in further detail.
[0027] Example 1: This application discloses a biodegradable biofilm production device.
[0028] Reference Figure 1 A biodegradable biofilm production device includes a mixing mechanism 1, a screw extruder 2, a casting extruder 3, a cooling roller 4, a trimming mechanism 5, a corona treatment mechanism 6, and a winding roller 7 arranged in sequence. Raw materials and additives are added to the mixing mechanism 1 in proportion, where they are mixed and proportioned. The mixed material is then fed into the screw extruder 2 for melt blending and extrusion. The melt is fed into the casting extruder 3, where it is extruded onto the cooling roller 4 for cooling and shaping. The cooled film first enters the trimming mechanism 5 for trimming, then enters the corona treatment mechanism 6 for corona treatment, and finally is wound onto the winding roller 7.
[0029] Reference Figure 2 and Figure 3The cooling roller 4 includes an inner roller body 41, an outer roller body 42, a first end cap 43, a second end cap 44, a first roller end shaft 45, and a second roller end shaft 46. The first end cap 43 and the second end cap 44 are respectively fixedly installed at both ends of the inner roller body 41 along its length. The two ends of the outer roller body 42 along its length are fixedly connected to the first end cap 43 and the second end cap 44, and the outer roller body 42 is coaxially installed on the outside of the inner roller body 41. The first roller end shaft 45 and the second roller end shaft 46 are respectively fixedly installed inside the first end cap 43 and the second end cap 44.
[0030] Multiple spiral baffles 8 are integrally formed at equal intervals on the outer side wall of the inner roller body 41. The side of the spiral baffles 8 away from the inner roller body 41 abuts against the inner side wall of the outer roller body 42. A first spiral flow channel 9 or a second spiral flow channel 10 is formed between each two adjacent spiral baffles 8. The multiple first spiral flow channels 9 and second spiral flow channels 10 are arranged sequentially at intervals along the axial direction of the cooling roller 4.
[0031] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 A first water inlet channel 11 is formed inside the first end cover 43 and the first roller end shaft 45. The first water inlet channel 11 consists of a first main water inlet channel 111 and a plurality of first secondary water inlet channels 112. The first main water inlet channel 111 is opened inside the first roller end shaft 45 along the axial direction of the first roller end shaft 45. The plurality of first secondary water inlet channels 112 are installed at equal intervals along the circumference of the first end cover 43 inside the first end cover 43. The inner ends of the plurality of first secondary water inlet channels 112 are connected to the first main water inlet channel 111, and the outer ends are connected to the plurality of first spiral flow channels 9.
[0032] A first water outlet channel 12 is formed within the second end cover 44 and the second roller end shaft 46. The first water outlet channel 12 consists of a first main water outlet channel 121 and a plurality of first secondary water outlet channels 122. The first main water outlet channel 121 is opened within the second roller end shaft 46 along the axial direction. The plurality of first secondary water outlet channels 122 are installed at equal intervals along the circumference of the second end cover 44 within the second end cover 44. The inner ends of the plurality of first secondary water outlet channels 122 are connected to the first main water outlet channel 121, and the outer ends are connected to the plurality of first spiral flow channels 9.
[0033] The first stream of coolant flows from the first main inlet channel 111 into multiple first secondary inlet channels 112, and then from the multiple secondary inlet channels 112 into multiple first spiral channels 9. During its flow within the first spiral channels 9, the coolant absorbs heat from the film, flows from the multiple secondary outlet channels 122 into the first main outlet channel 121, and finally flows out from the first main outlet channel 121.
[0034] A second water inlet channel 13 is formed within the second end cover 44 and the second roller end shaft 46. The second water inlet channel 13 consists of a second main water inlet channel 131 and multiple second auxiliary water inlet channels 132. The second main water inlet channel 131 is opened within the second roller end shaft 46 along the axial direction, and its cross-section is annular. Multiple auxiliary water inlet channels 132 are installed at equal intervals along the circumference of the second end cover 44 within the second end cover 44. The inner ends of the multiple auxiliary water inlet channels 132 are connected to the second main water inlet channel 131, and their outer ends are connected to multiple second spiral flow channels 10.
[0035] A second water outlet channel 14 is formed within the first end cover 43 and the first roller end shaft 45. The second water outlet channel 14 consists of a second main water outlet channel 141 and multiple second auxiliary water outlet channels 142. The second main water outlet channel 141 is opened within the first roller end shaft 45 along the axial direction, and its cross-section is annular. Multiple auxiliary water outlet channels 142 are installed at equal intervals along the circumference of the first end cover 43 within the first end cover 43. The inner ends of the multiple auxiliary water outlet channels 142 are connected to the second main water outlet channel 141, and their outer ends are connected to multiple second spiral flow channels 10.
[0036] The second stream of coolant flows from the second main inlet channel 131 into multiple secondary inlet channels 132, and then from the secondary inlet channels 132 into multiple second spiral flow channels 10. During its flow within the second spiral flow channels 10, the coolant absorbs heat from the thin film, flows from the secondary outlet channels 142 into the second main outlet channel 141, and finally flows out from the second main outlet channel 141.
[0037] The cooling roller 4 adopts a dual-loop counter-current heat exchange design. Two independent cooling media are introduced through their respective inlet channels and circulate in opposite directions within parallel spiral channels inside the roller body, finally being discharged through independent outlet channels. This counter-current layout significantly reduces the axial temperature gradient of the cooling roller 4, thereby ensuring the uniformity of the thermal field on the roller surface, fundamentally improving the consistency of the transverse cooling rate of the film, and guaranteeing the uniformity of the product thickness.
[0038] Reference Figure 8 Each spiral baffle 8 has multiple bridging channels 15 evenly spaced along its own spiral direction. The two ends of each bridging channel 15 are connected to two adjacent first spiral channels 9 and second spiral channels 10, respectively. A rotating wheel assembly 16 is installed in each bridging channel 15 of the spiral baffle 8.
[0039] When the two streams of coolant flow in the first spiral channel 9 and the second spiral channel 10, the two streams of coolant flow in opposite directions can drive the rotating wheel assembly 16 to rotate in one direction. During the rotation of the rotating wheel assembly 16, the mutual flow speed of the two streams of coolant is accelerated, thereby further reducing the temperature difference between the first spiral channel 9 and the second spiral channel 10.
[0040] Reference Figure 9 Specifically, the impeller assembly 16 includes a fixed shaft 161, an impeller body 162, and multiple rotating blades 163. The fixed shaft 161 is radially fixedly installed within the bridging channel 15 of the cooling roller 4. The impeller body 162 is rotatably mounted on the fixed shaft 161. The multiple rotating blades 163 are circumferentially and equally spaced on the outer wall of the impeller body 162. During the flow of the two streams of coolant within the first spiral channel 9 and the second spiral channel 10, the multiple rotating blades 163 can drive the impeller body 162 to rotate on the fixed shaft 161 (see reference). Figure 11 ).
[0041] Reference Figure 9 and Figure 10 A first rotating wheel 17 is fixedly mounted on the top wall of the rotating wheel body 162, and a circular first cavity 18 is formed inside the first rotating wheel 17. A first cam 19 is fixedly mounted on the upper half of the fixed shaft 161, and the first cam 19 is located inside the first cavity 18. A plurality of first sliding blades 20 are evenly spaced along the circumference of the outer wall of the first rotating wheel 17, and the first sliding blades 20 are slidably mounted along the radial direction of the first rotating wheel 17. A first slider 22 is fixedly mounted on the end of the first sliding blade 20 near the end of the first cam 19, and a first groove 21 is formed on the outer peripheral wall of the first cam 19, and the first slider 22 is slidably mounted in the first groove 21.
[0042] The rotating wheel body 162 drives the first rotating wheel 17 to rotate, the first rotating wheel 17 drives multiple first sliding blades 20 to rotate, and the first sliding blades 20 drive the first slider 22 to slide in the first sliding groove 21, so that when the first rotating wheel 17 rotates, the first sliding blades 20 can slide back and forth along the radial direction of the first rotating wheel 17.
[0043] A second rotating wheel 23 is fixedly mounted on the bottom wall of the rotating wheel body 162, and a circular second cavity 24 is formed inside the second rotating wheel 23. A second cam 25 is fixedly mounted on the lower half of the fixed shaft 161. The second cam 25 is located inside the second cavity 24, and the second cam 25 protrudes in the opposite direction to the first cam 19. A plurality of second sliding blades 26 are evenly spaced along their circumference on the outer wall of the second rotating wheel 23, and the second sliding blades 26 are slidably mounted along the radial direction of the second rotating wheel 23. A second slider 28 is fixedly mounted on the end of the second sliding blade 26 near the second cam 25. A second groove 27 is formed on the outer peripheral wall of the second cam 25, and the second slider 28 is slidably mounted in the second groove 27.
[0044] The rotating wheel body 162 drives the second rotating wheel 23 to rotate, the second rotating wheel 23 drives multiple second sliding blades 26 to rotate, and the second sliding blades 26 drive the second slider 28 to slide in the second sliding groove 27, so that when the second rotating wheel 23 rotates, the second sliding blades 26 can slide back and forth along the radial direction of the second rotating wheel 23.
[0045] When the two streams of cooling water flow within the first spiral channel 9 and the second spiral channel 10, the cooling water can communicate with each other within the first spiral channel 9 and the second spiral channel 10 through the bridging channel 15. During the flow of the coolant, the rotating blades 163 drive the impeller body 162 to rotate on the fixed shaft 161, and the impeller body 162 drives the first impeller 17 and the second impeller 23 to rotate.
[0046] Reference Figure 12 When the first sliding blade 20 rotates from the first spiral channel 9 into the second spiral channel 10, the first sliding blade 20 gradually extends out of the first rotating wheel 17, enabling the first sliding blade 20 to carry the coolant in the first spiral channel 9 into the second spiral channel 10. When the first sliding blade 20 enters the first spiral channel 9 from the second spiral channel 10, the first sliding blade 20 gradually retracts into the first rotating wheel 17, preventing the first sliding blade 20 from carrying the coolant in the second spiral channel 10 into the first spiral channel 9, thus accelerating the flow of coolant from the first spiral channel 9 into the second spiral channel 10.
[0047] Reference Figure 13 When the second sliding blade 26 enters the second spiral channel 10 from the first spiral channel 9, the second sliding blade 26 gradually retracts into the second impeller 23, preventing the second sliding blade 26 from carrying coolant from the first spiral channel 9 into the second spiral channel 10. When the second sliding blade 26 enters the first spiral channel 9 from the second spiral channel 10, the second sliding blade 26 gradually extends out of the second impeller 23, enabling the second sliding blade 26 to carry coolant from the second spiral channel 10 into the first spiral channel 9, thus accelerating the flow of coolant from the second spiral channel 10 into the first spiral channel 9.
[0048] The implementation principle of a biodegradable biofilm production device according to an embodiment of this application is as follows: raw materials and additives are added to a mixing mechanism 1 in proportion, and the mixing mechanism 1 mixes the raw materials and additives; the mixed material is fed into a screw extruder 2 for melt blending and extrusion of the melt; the melt is fed into a casting extruder 3, and the casting extruder 3 extrudes the melt onto a cooling roller 4 for cooling and shaping; the cooled film first enters a trimming mechanism 5 for trimming, then enters a corona treatment mechanism 6 for corona treatment, and finally is wound onto a winding roller 7. The cooling roller 4 adopts a dual-loop countercurrent heat exchange design, with two independent cooling media introduced through their respective inlet channels, circulating in opposite directions in parallel spiral channels within the roller body, and finally discharged through independent outlet channels. This countercurrent layout significantly weakens the axial temperature gradient of the cooling roller 4, thereby ensuring the uniformity of the heat field on the roller surface, fundamentally improving the consistency of the transverse cooling rate of the film, and ensuring the uniformity of the product thickness.
[0049] Example 2: This application discloses a method for producing biodegradable biofilms.
[0050] A method for producing a biodegradable biofilm, using the aforementioned biodegradable biofilm production equipment, includes the following steps: S1: The raw materials and additives are added into the mixing mechanism 1 in proportion, and the mixing mechanism 1 mixes the raw materials and additives. S2: The mixed material is fed into screw extruder 2 for melt blending and extrusion of the melt; S3: The molten material is fed into the casting extruder 3, and the casting extruder 3 extrudes the melt onto the cooling roller 4 for cooling and shaping. S4: The cooled film enters the edge-cutting mechanism 5 for edge cutting; S5: The cut film enters the corona treatment mechanism 6 for corona treatment; S6: The corona-treated film is wound up on the take-up roller 7.
[0051] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A biodegradable biofilm production device, characterized in that: The assembly includes a mixing mechanism (1), a screw extruder (2), a cast extruder (3), a cooling roller (4), a trimming mechanism (5), a corona treatment mechanism (6), and a take-up roller (7) arranged in sequence. The cooling roller (4) includes an inner roller body (41), an outer roller body (42), a first end cap (43), a second end cap (44), a first roller end shaft (45), and a second roller end shaft (46). The outer roller body (42) is coaxially sleeved on the inner roller body (41). The first end cap (43) is fixedly disposed at one end of the inner roller body (41) and the outer roller body (42). The second end cap (44) is fixedly disposed at the other end of the inner roller body (41) and the outer roller body (42). The first roller end shaft (45) is disposed on the first end cap (43), and the second roller end shaft (46) is disposed on the second end cap (44). Multiple spiral baffles (8) are provided on the outer side wall of the inner roller body (41), and multiple first spiral flow channels (9) and second spiral flow channels (10) are formed between the multiple spiral baffles (8). The multiple first spiral flow channels (9) and second spiral flow channels (10) are arranged sequentially at intervals along the axial direction of the cooling roller (4). A first water inlet channel (11) communicating with the multiple first spiral flow channels (9) is provided in the first end cover (43) and the first roller end shaft (45). The second end cover (44) and the second roller end shaft (45) are provided with a first water inlet channel (11) communicating with the multiple first spiral flow channels (9). The end shaft (46) is provided with a first water outlet channel (12) communicating with multiple first spiral flow channels (9), the second end cover (44) and the second roller end shaft (46) are provided with a second water inlet channel (13) communicating with multiple second spiral flow channels (10), the first end cover (43) and the first roller end shaft (45) are provided with a second water outlet channel (14) communicating with multiple second spiral flow channels (10), and the coolant flows in opposite directions in the first spiral flow channel (9) and the second spiral flow channel (10).
2. The biodegradable biofilm production equipment according to claim 1, characterized in that: Each of the spiral baffles (8) has multiple bridging channels (15) spaced apart along its own spiral direction, and the two ends of each bridging channel (15) are respectively connected to the first spiral channel (9) and the second spiral channel (10).
3. The biodegradable biofilm production equipment according to claim 2, characterized in that: The spiral baffle (8) is located in the cross-flow channel (15) and a rotating wheel assembly (16) is provided. The two streams of coolant in the first spiral flow channel (9) and the second spiral flow channel (10) drive the rotating wheel assembly (16) to rotate. The rotating wheel assembly (16) rotates and accelerates, causing the coolant in the first spiral flow channel (9) and the second spiral flow channel (10) to communicate with each other.
4. The biodegradable biofilm production equipment according to claim 3, characterized in that: The rotor assembly (16) includes a fixed shaft (161), a rotor body (162), and a plurality of rotating blades (163). The fixed shaft (161) is fixedly disposed in the cross-flow channel (15) of the spiral baffle (8). The rotor body (162) is rotatably disposed on the fixed shaft (161). The plurality of rotating blades (163) are fixedly disposed at equal intervals along the circumference of the rotor body (162) on the outer side wall of the rotor body (162).
5. The biodegradable biofilm production equipment according to claim 4, characterized in that: A first rotating wheel (17) is fixedly mounted on the top wall of the rotating wheel body (162). A first cavity (18) is formed inside the first rotating wheel (17). A first cam (19) is fixedly mounted on the fixed shaft (161). The first cam (19) is located inside the first cavity (18). A first sliding blade (20) is slidably mounted on the first rotating wheel (17) along its own radial direction. A first groove (21) is formed on the outer side wall of the first cam (19). A first sliding blade (20) is fixedly mounted at the end of the first sliding blade (20). The slider (22) is slidably disposed in the first groove (21). Multiple first sliding blades (20) are equally spaced along the circumference of the first rotating wheel (17). When the first sliding blade (20) enters the second spiral channel (10) from the first spiral channel (9), the first sliding blade (20) gradually extends out of the first rotating wheel (17). When the first sliding blade (20) enters the first spiral channel (9) from the second spiral channel (10), the first sliding blade (20) gradually retracts into the first rotating wheel (17).
6. The biodegradable biofilm production equipment according to claim 4, characterized in that: A second rotating wheel (23) is fixedly mounted on the bottom wall of the rotating wheel body (162). A second cavity (24) is formed inside the second rotating wheel (23). A second cam (25) is fixedly mounted on the fixed shaft (161). The second cam (25) is located inside the second cavity (24). A second sliding blade (26) is slidably mounted on the second rotating wheel (23) along its own radial direction. A second groove (27) is formed on the outer side wall of the second cam (25). A second sliding blade (26) is fixedly mounted at the end of the second sliding blade (26). The second slider (28) is slidably disposed in the second groove (27). Multiple second sliding blades (26) are equally spaced along the circumference of the second rotating wheel (23). When the second sliding blade (26) enters the second spiral flow channel (10) from the first spiral flow channel (9), the first sliding blade (20) gradually retracts into the second rotating wheel (23). When the second sliding blade (26) enters the first spiral flow channel (9) from the second spiral flow channel (10), the second sliding blade (26) gradually extends out of the second rotating wheel (23).
7. The biodegradable biofilm production equipment according to claim 1, characterized in that: The first water inlet channel (11) includes a first main water inlet channel (111) and a plurality of first secondary water inlet channels (112). The first main water inlet channel (111) is located inside the first roller end shaft (45). The plurality of first secondary water inlet channels (112) are located inside the first end cover (43) and connect the first main water inlet channel (111) and the plurality of first spiral flow channels (9). The first water outlet channel (12) includes a first main water outlet channel (121) and a plurality of first secondary water outlet channels (122). The plurality of first secondary water outlet channels (122) are located inside the second end cover (44) and connect the plurality of first spiral flow channels (9). The first main water outlet channel (121) is located inside the second roller end shaft (46) and connects the plurality of first secondary water outlet channels (122).
8. The biodegradable biofilm production equipment according to claim 1, characterized in that: The second water inlet channel (13) includes a second main water inlet channel (131) and a plurality of second secondary water inlet channels (132). The second main water inlet channel (131) is located inside the second roller end shaft (46). The plurality of second secondary water inlet channels (132) are located inside the second end cover (44) and connect the second main water inlet channel (131) and the plurality of second spiral flow channels (10). The second water outlet channel (14) includes a second main water outlet channel (141) and a plurality of second secondary water outlet channels (142). The plurality of second secondary water outlet channels (142) are located inside the first end cover (43) and connect the plurality of second spiral flow channels (10). The second main water outlet channel (141) is located inside the first roller end shaft (45) and connects the plurality of second secondary water outlet channels (142).
9. A method for producing a biodegradable biofilm, characterized in that: The biodegradable biofilm production equipment according to any one of claims 1-8 comprises the following steps: S1: The raw materials and additives are added into the mixing mechanism (1) in proportion, and the mixing mechanism (1) mixes the raw materials and additives. S2: The mixed material is fed into the screw extruder (2) for melt blending and extrusion of the melt; S3: The molten material is fed into the casting extruder (3), and the casting extruder (3) extrudes the melt onto the cooling roller (4) for cooling and shaping; S4: The cooled film enters the trimming mechanism (5) for trimming; S5: The cut film enters the corona treatment mechanism (6) for corona treatment; S6: The corona-treated film is wound up on the take-up roller (7).