Drying device for PVC film production
By using a drying box design in PVC film production that incorporates a heating fan and a waste gas flow barrier, the problem of waste gas leakage during drying is solved, achieving both environmental protection and health and safety while improving drying efficiency and product quality.
Patent Information
- Application Number
- CN202423296522.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing PVC film drying methods generate exhaust gases that can easily escape from the inlet and outlet of the drying tunnel, harming the production workshop environment and human health.
It adopts a drying box design, uses a heating fan to provide hot air, and combines exhaust gas obstruction components and airflow curtain technology to prevent exhaust gas from flowing out, and then purifies it through a special exhaust gas treatment device.
It effectively prevents the flow of drying waste gas, maintains a good environmental quality in the workshop, avoids health hazards, and improves drying efficiency and product quality.
Smart Images
Figure CN223520451U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of PVC film production, in particular to a drying device for PVC film production. BACKGROUND
[0002] After printing, the printed film needs to be dried to fix the printing ink and prevent color fading. In the existing drying method, the printed PVC film is conveyed to the drying channel by a conveying belt, and each drying channel is equipped with a heating furnace. The heating furnace generates heat by burning natural gas, and the natural gas combustion heat is introduced into the drying channel through a stainless steel pipe to increase the air temperature in the drying channel and volatilize the organic solvents and moisture on the PVC film.
[0003] However, the drying process inevitably produces drying waste gas, part of which easily flows out at the inlet and outlet of the drying channel. The drying waste gas contains volatile organic solvents (usually containing volatile organic compounds such as benzene, toluene, xylene, etc., which are toxic and irritating) volatilized from the PVC film, which can harm the production workshop environment and human health. SUMMARY
[0004] The purpose of the application is to provide a drying device for PVC film production, which can solve the technical problem that the drying waste gas produced by the existing drying method flows out from the inlet and outlet of the drying channel, harming the production workshop environment and human health.
[0005] The application provides a drying device for PVC film production, which comprises a drying box, one side of the drying box is provided with a film inlet, the other side of the drying box is provided with a film outlet, the film inlet and the film outlet are oppositely arranged to form a drying channel, a conveying belt penetrating the drying channel is arranged on the drying box, an air inlet pipe connected with a heating fan is communicated with the top of the drying box, an air outlet pipe connected with a waste gas treatment equipment is communicated with the lower part of one side of the drying box, and a waste gas blocking component for preventing the flow of drying waste gas is arranged at the film inlet and the film outlet.
[0006] Further, the waste gas blocking component comprises a waste gas cover and a flow blocking pipe, the waste gas cover is fixedly connected with the outer side of the drying box, the conveying belt penetrates the waste gas cover, an air cavity is arranged in the waste gas cover, an air blowing port in communication with the air cavity is arranged on the inner side of the waste gas cover away from the drying box, one end of the flow blocking pipe is in communication with the air cavity, and the other end of the flow blocking pipe is connected with the air inlet pipe.
[0007] Further, the air blowing port is inclined, and the included angle between the airflow blown out of the air blowing port and the conveying belt is an acute angle.
[0008] Further, the first adjusting valve is arranged on the air inlet pipe, the second adjusting valve is arranged on the air outlet pipe, and the third adjusting valve is arranged on the flow resistance pipe.
[0009] Further, the steel wire mesh is arranged in the drying box.
[0010] Further, the heat preservation inner layer is arranged in the drying box.
[0011] Further, the air deflector is arranged at the joint of the air inlet pipe and the flow resistance pipe.
[0012] The present application has the following beneficial effects:
[0013] The air inlet pipe is communicated with the top of the drying box, and is connected with the heating fan, so that the heated air from outside can be continuously conveyed into the drying box, and the required heat is continuously provided for the drying process.
[0014] The hot air machine inputs the hot air into the drying box through the air inlet pipe, and the organic solvent volatilized from the PVC film is mixed with the hot air to form the drying waste gas during the drying process. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows.
[0016] Figure 1 The structure schematic diagram in some embodiments of the present application;
[0017] Figure 2 The sectional view in some embodiments of the present application;
[0018] The reference signs are as follows:
[0019] 1, drying box; 2, film inlet; 3, film outlet; 4, conveying belt; 5, air inlet pipe; 6, air outlet pipe; 7, waste gas resistance assembly; 71, waste gas cover; 711, air cavity; 712, air outlet; 72, resistance pipeline; 8, first regulating valve; 9, second regulating valve; 10, third regulating valve; 11, steel wire mesh; 12, thermal insulation inner lining; 13, air deflector. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.
[0022] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0023] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.
[0024] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0025] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiments:
[0027] As shown in Figure 1 and Figure 2 The present application provides a drying device for PVC film production, which comprises a drying box 1, one side of the drying box 1 is provided with a film inlet 2, the other side of the drying box 1 is provided with a film outlet 3, the film inlet 2 and the film outlet 3 are oppositely arranged to form a drying channel, a conveying belt 4 is arranged on the drying box 1 and penetrates the drying channel, an air inlet pipe 5 for connecting with a heating fan is communicated with the top of the drying box 1, the heated air from outside can be continuously conveyed into the drying box 1 by the heating fan, which continuously provides the required heat for the drying process. Compared with the prior art, the hot air supplied by the heating fan instead of the hot air supplied by the heating furnace avoids the generation of waste gas such as carbon dioxide, sulfur dioxide and nitrogen oxides by natural gas combustion, which has a positive effect on environmental protection. The lower part of one side of the drying box 1 is communicated with an air outlet pipe 6 for connecting with a waste gas treatment equipment, which facilitates the timely conveying of waste gas containing organic solvents generated during the drying process to the special waste gas treatment equipment for purification treatment through the air outlet pipe 6. The film inlet and the film outlet 3 are both provided with a waste gas resistance component 7 for preventing the outflow of drying waste gas. The organic solvent volatilized from the PVC film during the drying process is mixed with the hot air to form drying waste gas, and the waste gas resistance component 7 can effectively block the outflow of drying waste gas from the two key positions prone to leakage, avoid the diffusion of waste gas in the workshop, maintain a good working environment and air quality, and avoid the harm of drying waste gas to human health.
[0028] As shown in Figure 1 and Figure 2As shown, the exhaust blocking assembly 7 includes an exhaust cover 71 and a blocking pipe 72, the exhaust cover 71 is fixedly connected with the outside of the drying box 1, the conveying belt 4 penetrates through the exhaust cover 71, the exhaust cover 71 is internally provided with an air cavity 711, the inner side of the exhaust cover 71 away from the drying box 1 is provided with a blowing port 712 in communication with the air cavity 711, one end of the blocking pipe 72 is in communication with the air cavity 711, and the other end of the blocking pipe 72 is connected with the air inlet pipe 5. The cover can cover the film inlet port 2 and the film outlet port 3 area, limit the exhaust gas from escaping to the workshop environment from the source, minimize the leakage of the drying exhaust gas, introduce part of the hot air generated by the air heater into the air cavity 711 through the blocking pipe 72, and then the hot air blown out from the blowing port 712 forms a continuous and directional air curtain. The air curtain cleverly interferes and offsets the power of the exhaust gas diffusing outward, and strengthens the blocking of the exhaust gas overflow.
[0029] As shown in Figure 2 , the blowing port 712 is inclinedly arranged, and the included angle between the air flow blown out of the blowing port 712 and the conveying belt 4 is an acute angle. When the air flow blown out of the blowing port 712 and the conveying belt 4 form an acute angle, the air flow can be sprayed out along the running direction of the conveying belt 4 at a certain inclination angle. The air flow blown out at an acute angle blocks the exhaust gas while sweeping the PVC film on the conveying belt 4. The impact and waving of the air flow promote the organic solvent on the film surface to evaporate faster, thereby improving the drying effect. In this embodiment, the included angle between the air flow blown out of the blowing port 712 and the conveying belt 4 is 30°.
[0030] As shown in Figure 1 and Figure 2 , the first adjusting valve 8 is arranged on the air inlet pipe 5, the second adjusting valve 9 is arranged on the air outlet pipe 6, and the third adjusting valve 10 is arranged on the blocking pipe 72. The required drying temperature and hot air flow are different due to the differences in thickness, material formula and printing process of the PVC film. The first adjusting valve 8 of the air inlet pipe 5 can control the hot air flow and pressure of the air heater input into the drying box 1. The operator can flexibly adjust according to the characteristics of the PVC film. For thick film, the flow is increased, and for thin film, the flow is appropriately reduced. The drying is just right, and the product quality is not damaged due to insufficient drying or over-drying. The second adjusting valve 9 of the air outlet pipe 6 can adjust the discharge flow in real time according to the amount of exhaust gas generated in the drying box 1. In the initial stage of drying, the flow is adjusted to be small when the exhaust gas is small. As the drying process advances and the exhaust gas increases, the opening degree is increased. The exhaust gas is ensured to flow to the treatment equipment in an orderly and efficient manner, preventing the exhaust gas from being accumulated in the drying box 1 due to poor exhaust, and avoiding excessive discharge that exceeds the load of the treatment equipment, thereby ensuring that the exhaust gas meets the treatment standards. The third adjusting valve 10 on the blocking pipe 72 can adjust the air flow blown out of the blowing port. The flow rate of the air curtain is adjusted according to the actual situation, and the blocking effect is improved.
[0031] As shown in Figure 2As shown, the steel wire mesh 11 is fixed in the drying box 1 and is located above the conveying belt 4. When the hot air machine delivers hot air to the drying box 1 through the air inlet pipe 5, the steel wire mesh 11 can play a buffering and dispersing role. When the hot air meets the steel wire mesh 11, the flow direction of the hot air will change, and the hot air will be divided into multiple smaller and uniform air flows. Then, the hot air is uniformly sprayed on the surface of the PVC film on the conveying belt 4 below, avoiding the hot air from being concentrated and directly blowing on a certain area. As a result, each part of the PVC film can be fully and evenly heated, the evaporation speed of the organic solvent and moisture is accelerated, the drying degree is consistent, the overall drying quality of the product is improved, and the rate of defective products caused by uneven heating is reduced.
[0032] As shown in Figure 2 The drying box 1 is provided with a heat preservation inner lining 12. The heat preservation inner lining 12 can effectively block the transfer of heat to the external environment. During the drying process, the hot air machine continuously delivers hot air to the drying box 1. The heat preservation inner lining 12 can lock the heat in the drying box 1, maintain a high-temperature environment in the box, reduce the need for frequent start of the hot air machine to supplement heat, and reduce energy consumption.
[0033] As shown in Figure 2 The air inlet pipe 5 is provided with an air deflector 13 at the connection between the air inlet pipe 5 and the resistance pipeline 72. When the hot air machine delivers hot air to the drying box 1, the air deflector 13 plays a key role in shunting and guiding. Part of the hot air directly flows along the main channel of the air inlet pipe 5 to the drying box 1 to provide main heat for the drying of the PVC film. Another part of the hot air is smoothly guided into the resistance pipeline 72 by the air deflector 13, and then enters the air cavity 711 of the waste gas baffle 71 to form an auxiliary sealing air curtain.
[0034] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A drying device for PVC film production, characterized by: The drying box is provided with a film inlet on one side and a film outlet on the other side, the film inlet and the film outlet are oppositely arranged to form a drying channel, a conveying belt is arranged on the drying box and penetrates the drying channel, an air inlet pipe for connecting with a heating fan is communicated with the top of the drying box, an air outlet pipe for connecting with a waste gas treatment device is communicated with the lower part of one side of the drying box, and a waste gas blocking component for preventing waste gas from flowing out is arranged at the film inlet and the film outlet.
2. The drying device for PVC film production according to claim 1, characterized in that: The waste gas blocking component comprises a waste gas cover and a blocking pipe, the waste gas cover is fixedly connected with the outside of the drying box, the conveying belt penetrates the waste gas cover, an air cavity is arranged in the waste gas cover, an air blowing port for communicating with the air cavity is arranged on the inner side of the waste gas cover away from the drying box, one end of the blocking pipe is communicated with the air cavity, and the other end of the blocking pipe is connected with the air inlet pipe.
3. The drying device for PVC film production according to claim 2, characterized in that: The air blowing port is arranged in an inclined manner, and the included angle between the airflow blown by the air blowing port and the conveying belt is an acute angle.
4. The drying device for PVC film production according to claim 2, characterized in that: First, second and third adjusting valves are arranged on the air inlet pipe, the air outlet pipe and the blocking pipe respectively.
5. The drying device for PVC film production according to claim 1, characterized in that: A steel wire mesh is fixedly arranged in the drying box and located above the conveying belt.
6. The drying device for PVC film production according to claim 1, characterized in that: A heat preservation inner layer is arranged in the drying box.
7. The drying device for PVC film production according to claim 2, characterized in that: An air deflector is fixedly arranged in the air inlet pipe at the connection between the air inlet pipe and the blocking pipe.