CN119175871B - A low-permeability film casting production line - Google Patents
A low-permeability film casting production line Download PDFInfo
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- CN119175871B CN119175871B CN202411686421.4A CN202411686421A CN119175871B CN 119175871 B CN119175871 B CN 119175871B CN 202411686421 A CN202411686421 A CN 202411686421A CN 119175871 B CN119175871 B CN 119175871B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 238000005266 casting Methods 0.000 title description 16
- 238000001816 cooling Methods 0.000 claims abstract description 93
- 238000010438 heat treatment Methods 0.000 claims abstract description 87
- 238000007493 shaping process Methods 0.000 claims abstract description 53
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 36
- 238000010345 tape casting Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 31
- 230000008569 process Effects 0.000 abstract description 26
- 230000008859 change Effects 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000005457 optimization Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000009351 contact transmission Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010096 film blowing Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/16—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/16—Cooling
- B29C2035/1658—Cooling using gas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
本发明公开了一种低透气薄膜流延成型生产线，涉及塑料加工领域，本方案提供的低透气薄膜流延成型生产线针对拉伸进行了定向的缺陷优化，通过差速组件和匀速组件的结合，能够精确控制膜体在加热拉伸和冷却定型过程中的拉伸速度和温度变化，从而确保薄膜厚度的均匀性及力学性能的稳定。同时，冷却定型组件通过逐级降温的方式对薄膜进行均匀冷却，防止膜体在冷却后因应力不均而产生粘连或变形。停机过程中，通过状态限制组件的作用，能够有效防止薄膜反向拉扯和断裂，保障停机后的安全性和生产连续性。此外，该设备的自动张力调控功能确保了在各种工况下薄膜的拉伸应力得到有效缓解，从而大大提高了薄膜生产的效率和产品质量。
The present invention discloses a low-permeability film cast molding production line, which relates to the field of plastic processing. The low-permeability film cast molding production line provided by the present solution has carried out directional defect optimization for stretching. Through the combination of a differential component and a uniform speed component, the stretching speed and temperature change of the film body during heating stretching and cooling shaping can be accurately controlled, thereby ensuring the uniformity of the film thickness and the stability of the mechanical properties. At the same time, the cooling shaping component uniformly cools the film by step-by-step cooling to prevent the film body from sticking or deforming due to uneven stress after cooling. During the shutdown process, the state limiting component can effectively prevent the film from being pulled in the opposite direction and breaking, thereby ensuring safety and production continuity after shutdown. In addition, the automatic tension control function of the equipment ensures that the tensile stress of the film is effectively relieved under various working conditions, thereby greatly improving the efficiency of film production and product quality.
Description
Technical Field
The invention relates to the field of plastic processing, in particular to a low-air-permeability film casting forming production line.
Background
The existing low-permeability film is widely applied to the fields of food packaging, medical dressing, building waterproof materials and the like, and has the main functions of having certain barrier property, preventing air or water vapor from penetrating, prolonging the service life of products or keeping the freshness of articles in the packaging. However, conventional low-permeability films generally employ a blown film process, which, although having a certain advantage in terms of cost, has a large limitation in terms of film thickness uniformity, air permeability control, and production efficiency. Film blowing processes tend to result in non-uniform film thickness and lower tensile strength, which directly affects the physical properties of the film, especially in applications requiring higher durability and barrier properties, and fail to meet stringent quality requirements.
In order to improve the production quality and performance of the low-permeability film, a tape casting process is gradually introduced. The casting molding process is to melt the raw materials by an extruder, uniformly extrude the melt by a die head and form a film, and then cool and stretch the film to obtain the finished product. Compared with the traditional film blowing process, the casting process can realize more accurate film thickness control, the physical properties of the film are obviously improved, and the film has obvious advantages in the aspects of air permeability, tensile strength, thickness uniformity and the like. In addition, the casting process has high production speed and high automation degree, is suitable for large-scale production, and can effectively improve the production efficiency and the product quality. However, in the casting molding process of the low-air-permeability film at present, the problems of low stretching control precision, insufficient film thickness consistency, poor coordination among production line equipment and the like still exist, so that the yield is low, and the further popularization of the casting process is limited.
In the conventional low air permeability film casting line, stretching is usually performed after heating the film by a heated roll, but there are a number of drawbacks in this manner. First, temperature control of the heated rolls is difficult to be precise, and once temperature fluctuation is large, uneven stretching of the film can be caused, and thickness uniformity and physical properties of the film are affected. Too high a temperature may result in localized overstretching or excessive softening of the film, reducing strength and durability, while too low a temperature may result in insufficient stretching, insufficient film strength and ductility. In addition, during the cooling and winding process after the heated rolls, local stress concentrations may occur due to rapid stretching after heating, which increases the risk of film breakage during production, especially at high stretch ratios.
In addition, after the existing equipment is shut down due to damage of parts operated for a long time or power failure, the film is often in a stretching state, and the film is easy to break due to high stress concentration of the film during stretching and temperature change or equipment inertia in the shut down process. The occurrence of breakage not only wastes raw materials, but also increases the debugging time when restarting production, and reduces the production efficiency. In addition, under the shutdown state of the traditional production line, the tension of the film is difficult to effectively control, and especially when the stretching roller and the winding system are not synchronously adjusted, the film can be reversely pulled, so that the stress of the film is uneven, and the possibility of breakage is further increased.
Disclosure of Invention
The invention aims to solve the problem that a low-air-permeability film of a traditional production line is easy to break in the stretching process, and provides a low-air-permeability film tape casting and forming production line.
In order to achieve the aim, the invention adopts the following technical scheme that the low-air-permeability film casting forming production line comprises a low-air-permeability film casting forming production line composed of a screw extruder, a casting machine, cooling equipment, a stretcher, a cutting mechanism and a winding machine, wherein a feeding end of the screw extruder is provided with a transmission device which is communicated with a mixing device, the mixing device is communicated with a feeding equipment, the stretcher comprises a shell and a stretched film body in the shell, and the stretcher further comprises:
The stretching assembly is fixedly connected to the inner wall of the shell, the film body is wound on the surface of the stretching assembly and comprises a heating stretching assembly and a cooling shaping assembly, the heating stretching assembly stretches the film body in a heating state through a rotating speed difference, the stretched film body is kept in a stretching state and is conveyed in a cooling shaping assembly in a cooling mode, the stretching state is fixed, and the heating stretching assembly and the cooling shaping assembly are rotatably arranged on the inner wall of the shell;
The transmission assembly is rotatably arranged on one side of the stretching assembly and drives the stretching assembly to operate, and the transmission assembly comprises a differential assembly and a uniform speed assembly, wherein the differential assembly is rotatably arranged on one side of the heating stretching assembly and drives the heating stretching assembly to form a multi-stage transmission speed difference for the film body, and the uniform speed assembly is rotatably arranged on one side of the cooling shaping assembly and drives the cooling shaping assembly to uniformly transmit the film body;
A driver is arranged on one side of the shell, an output shaft of the driver is fixedly connected with a driving gear, and the driving gear is meshed with one side of the transmission assembly;
The state limiting assembly is arranged on one side of the heating stretching assembly and the cooling shaping assembly, and is used for elastically supporting deflection of the heating stretching assembly and the cooling shaping assembly and controlling the maximum stretching speed, the shutdown anti-reverse holding and the film stretching unloading force;
The temperature control assembly is fixedly arranged on one side of the shell and used for providing cold and hot air flow for the stretching assembly, the temperature control assembly comprises a fan and a heater which are fixed on the surface of the shell, an air outlet of the fan is communicated with the heater through a main air pipe, throttle valves used for controlling air flow are arranged on the side walls of the heater and the main air pipe, and two connecting pipes communicated with the stretching assembly are arranged at the ports of the two throttle valves.
The fan of control by temperature change subassembly can provide wind-force, and the air current flows to the one end of design roller through throttle valve and the connecting pipe on one side of main tuber pipe, provides the cold air current, and the surplus air current enters into in the heater to through the throttle valve on heater one side, make its fixed air current enter into the one end of corresponding stretching roller through the connecting pipe, make it provide the hot air current and carry out the heating operation of film body, can control the flow of cooling air current and heating air current through two throttle valves, and the heater can control the temperature of heating air current, realizes accurate control.
As further description of the technical scheme, the heating stretching assembly comprises a first support fixedly connected to the inner wall of the shell, a heating roller set is rotatably arranged on the inner wall of the first support, and a plurality of first guide pipes are arranged at two ends of the heating roller set.
As further description of the technical scheme, the heating roller set comprises a heating air cylinder rotationally connected to the inner wall of the first support frame, the two ends of the heating air cylinder are fixedly penetrated by the first support frame, three stretching rollers are rotationally arranged on opposite surfaces of the two first support frames, two ends of the stretching rollers are connected in series through first guide pipes, and one end of the corresponding stretching roller is communicated with the corresponding side connecting pipe.
As further description of the technical scheme, the cooling shaping assembly comprises a second retainer fixedly connected to the inner wall of the shell, the inner wall of the second retainer is rotatably connected with a cooling roller set, and a plurality of second guide pipes are arranged on two sides of the cooling roller set.
As further description of the technical scheme, the cooling roller set comprises a cooling air duct rotatably arranged on the inner wall of the second support, the two ends of the cooling air duct are fixedly penetrated by the second retainers, a plurality of shaping rollers are rotatably arranged on the opposite surfaces of the two second retainers, the two ends of the plurality of shaping rollers are connected in series through second guide pipes, and one end of the corresponding shaping roller is communicated with another connecting pipe.
According to the technical scheme, the differential assembly comprises a first disc wheel rotatably connected to one end of a heating air cylinder, a low-speed gear, a medium-speed belt pulley and a high-speed gear are arranged on the surface of the first disc wheel in a transmission mode, the low-speed gear and the high-speed gear are in meshed transmission with the first disc wheel, the medium-speed belt pulley is in transmission connection with the first disc wheel through a belt, the low-speed gear, the medium-speed belt pulley and the high-speed gear are respectively fixed to one end of a corresponding stretching roller according to a film body contact transmission sequence, the low-speed gear, the medium-speed belt pulley and the high-speed gear respectively drive the corresponding stretching roller to rotate, and a rotating speed difference is formed between adjacent stretching rollers.
As further description of the technical scheme, the constant-speed assembly comprises a second disc wheel rotatably connected to one end of the cooling air duct, two constant-speed gears are meshed and driven on the surface of the second disc wheel, and the second disc wheel is connected with a constant-speed belt pulley through a driving belt.
As further description of the technical scheme, the stretching roller and the shaping roller both comprise heat conduction cylinders, two ends of each heat conduction cylinder are communicated and fixed with end pipes, and a plurality of fins are fixedly attached to the inner wall of each heat conduction cylinder.
As further description of the technical scheme, the first disc wheel and the second disc wheel are in meshed transmission, the first disc wheel is in meshed transmission with the driving gear, and the arc-shaped side walls of the first disc wheel and the second disc wheel are provided with belt grooves for being matched with belt transmission.
According to the technical scheme, the state limiting assembly comprises a pull frame fixedly connected to one end of a heating air duct, a height adjusting plate is fixedly connected to the surface of the pull frame, the state limiting assembly further comprises a pressing frame fixedly connected to one end of a cooling air duct, the pressing frame is attached to the upper surface of the height adjusting plate, a tension spring is fixedly connected to the upper surface of the pull frame, an inclined frame is fixedly connected to the top end of the tension spring, and the inclined frame is fixedly connected to the top of the first supporting frame.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
According to the scheme, the differential assembly is adopted to drive the plurality of stretching rollers to rotate, the plurality of stretching rollers are connected end to end through the first guide pipe, heat provided by the temperature control assembly firstly enters the leftmost stretching roller and sequentially enters the rightmost stretching roller and then enters the heating air drum, firstly, the film body stretches under the rotation speed difference of the rightmost stretching roller and the middle stretching roller, in the process, the film body is sequentially heated at the rightmost stretching roller and is subjected to primary stretching, then the middle stretching roller is used for carrying out secondary heating on the film body, the film body is subjected to secondary stretching under the rotation speed difference of the stretching roller and finally the leftmost stretching roller is subjected to maximum temperature heating, so that the stress after stretching can be eliminated, the hot air flow which is gradually cooled from left to right is matched with the stretching which is gradually increased from right to left is carried out heat preservation when the hot air flow which is directionally sprayed out by the heating air drum is guided downwards to the film body and stretched on the adjacent stretching roller, the film body is kept at the same temperature, the mode is realized, the temperature is controlled to be more finely, the stretching quality is greatly influenced by the temperature, the stretching quality is prevented from being greatly fluctuating, the stretching quality is gradually is ensured, and the stretching process is greatly is ensured to be free from the effect of the maximum temperature under the condition that the stretching stress is gradually increased;
Meanwhile, after stretching, the film body is sequentially contacted with the surfaces of three shaping rollers of the cooling shaping assembly from right to left, the shaping rollers sequentially flow from left to right, heated air flows are uniformly blown out of the film body through a cooling air duct, the mode is matched with a second disc wheel meshed with a first disc wheel in the uniform speed assembly to simultaneously rotate with two constant speed gears and a constant speed belt pulley, and then the three cooling rollers and the leftmost stretching roller are in a same-speed rotation state, so that the stretched film body can be gradually cooled in a length keeping state, the stress of the stretched film body is eliminated, the film body is completely shaped, the cooling is controlled step by step, the uniformity of cooling is guaranteed, and the condition of adhesion caused by concentrated stress after winding is avoided;
When the machine is used, two first disc wheels and second disc wheels which rotate in opposite directions are used for carrying out elastic support on the heating roller set and the cooling roller set through the state limiting component, if the rotating speed is too high and exceeds the maximum stretching speed of the film body, the state limiting component of the elastic support is displaced, so that a constant speed gear is clamped between the first disc wheels and the second disc wheels, shutdown is realized, the condition that the stretching speed is affected by the error in process parameter setting is avoided, meanwhile, the state limiting component clamps the high speed gear between the first disc wheels and the second disc wheels during shutdown, reverse movement of the film body during shutdown is avoided, the film body of each operation procedure in the shutdown process is prevented from being displaced, the continuity of production during restarting is ensured, and the film body during shutdown is subjected to the effect of the state limiting component to deflect, so that the film body during heating and stretching can be retracted and unloaded, the film breakage caused by insufficient temperature and continuous stretching action under the shutdown state is avoided, and the time period from the shutdown process to the regeneration is greatly ensured.
Drawings
FIG. 1 is a schematic flow diagram of a casting line of the present invention;
FIG. 2 is a schematic view of a drawing machine for a continuous forming line according to the present invention;
FIG. 3 is a schematic view showing a perspective structure of the drawing machine after the casing of the drawing machine is disassembled;
FIG. 4 is a schematic diagram of the differential assembly and heating roller set of the stretcher of the present invention;
FIG. 5 is a schematic diagram of the cooperation structure of the uniform speed assembly and the cooling roller set of the stretching machine;
FIG. 6 is a schematic view of a three-dimensional cross-sectional structure of the stretching machine of the present invention;
FIG. 7 is a schematic diagram of a perspective view of a heating and stretching assembly and a cooling and shaping assembly of the stretching machine according to the present invention;
FIG. 8 is a schematic diagram of the transmission assembly of the stretching machine of the present invention in elevation;
FIG. 9 is a schematic diagram of a state limiting assembly of the stretcher of the present invention in elevation;
FIG. 10 is a schematic cross-sectional view of a drawing roll perspective of the drawing machine of the present invention;
FIG. 11 is a schematic view of the direction of rotation of the transmission assembly of the stretcher of the present invention;
FIG. 12 is a schematic diagram of the force bearing structure of the differential and uniform speed assemblies of the present invention.
Legend description:
1. a housing;
2. a membrane body;
3. The device comprises a temperature control assembly, a fan, a main air pipe, a heater, a throttle valve, a connecting pipe and a throttle valve, wherein the temperature control assembly comprises a fan, a main air pipe, a throttle valve and a connecting pipe;
4. stretching the assembly;
41. Heating and stretching components 411, heating roller groups 4111, a first holding frame 4112, a heating air drum 4113, stretching rollers 41131, a heat conduction drum 41132, end pipes 41133, fins 412 and a first support frame;
413. a first conduit;
42. cooling shaping components 421, cooling roller groups 4211, second retainers 4212, cooling air cylinders 4213, shaping rollers 422, second brackets 423, second guide pipes;
5. a transmission assembly;
51. Differential assembly, 511, first disc wheel, 512, low-speed gear, 513, medium-speed pulley, 514, high-speed gear;
52. Constant speed component 521, second disc wheel 522, constant speed gear 523, constant speed belt pulley;
6. the state limiting assembly comprises a state limiting assembly, a inclined frame, a 62, a tension spring, a 63, a pull frame, a 64, a pressing frame, a 65 and a height adjusting plate;
7. Pi Daicao;
8. A driver;
9. a driving gear.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in figures 1-12, the invention provides a low-air-permeability film casting and forming production line, which comprises a casting and forming production line composed of a screw extruder, a casting machine, cooling equipment, a stretcher, a cutting mechanism and a winding machine, wherein a feeding end of the screw extruder is provided with a transmission device which is communicated with a mixing device, the mixing device is communicated with a feeding equipment, the stretcher comprises a shell 1 and a stretched film body 2 in the shell 1, and the stretcher further comprises:
the stretching assembly 4 is fixedly connected to the inner wall of the shell 1, the film body 2 is wound on the surface of the stretching assembly 4 and comprises a heating stretching assembly 41 and a cooling shaping assembly 42, the heating stretching assembly 41 stretches the film body 2 in a heating state through a rotating speed difference, the stretched film body 2 is kept in a stretching state and is conveyed in a cooling shaping assembly 42 in a cooling mode, and the heating stretching assembly 41 and the cooling shaping assembly 42 are rotatably arranged on the inner wall of the shell 1;
the heating stretching assembly 41 controls the gradual heating and stretching of the film through the rotation speed difference, so that the film is subjected to proper stretching force and temperature at different stages, the stretching process is ensured to be uniform, and the strength and the ductility of the film are effectively improved. By precisely controlling the heating, stretching and cooling processes of the film, the quality and production efficiency of the film are improved, and meanwhile, the risk of damage to the film during shutdown or failure is reduced.
The transmission assembly 5 is rotatably arranged on one side of the stretching assembly 4 and drives the stretching assembly 4 to operate, and comprises a differential assembly 51 and a uniform speed assembly 52, wherein the differential assembly 51 is rotatably arranged on one side of the heating stretching assembly 41 and drives the heating stretching assembly 41 to form a multi-stage transmission speed difference for the film body 2, and the uniform speed assembly 52 is rotatably arranged on one side of the cooling shaping assembly 42 and drives the cooling shaping assembly 42 to uniformly transmit the film body 2;
The transmission assembly 5 controls the rotation speed difference of the heating stretching assembly 41 and the cooling shaping assembly 42 through the differential assembly 51 and the uniform speed assembly 52, so that the films are ensured to be conveyed in multiple stages and cooled at uniform speed. The differential assembly 51 is responsible for providing a rotational speed differential during the heating phase to ensure gradual stretching of the film, while the uniform assembly 52 maintains stable film transport during the cooling phase to avoid stress concentrations.
A driver 8 is arranged on one side of the shell 1, an output shaft of the driver 8 is fixedly connected with a driving gear 9, and the driving gear 9 is meshed with one side of the transmission assembly 5;
the driver 8 is used for the overall power input and drives the transmission assembly 5 via the driving gear 9.
The state limiting component 6 is arranged on one side of the heating stretching component 41 and the cooling shaping component 42, and is used for elastically supporting the deflection of the heating stretching component 41 and the cooling shaping component 42 and controlling the maximum stretching speed, the shutdown anti-reverse holding and the stretching and unloading force of the film body 2;
The temperature control assembly 3 is fixedly arranged on one side of the shell 1 and used for providing cold and hot air flow for the stretching assembly 4, the temperature control assembly comprises a fan 31 and a heater 33 which are fixed on the surface of the shell 1, an air outlet of the fan 31 is communicated with the heater 33 through a main air pipe 32, the heater 33 and the side wall of the main air pipe 32 are both provided with throttle valves 34 used for controlling air flow, and two connecting pipes 35 communicated with the stretching assembly 4 are arranged at ports of the two throttle valves 34.
The temperature control assembly 3 can provide hot air flow and normal temperature air flow, and the heating and cooling efficiency of the film body 2 is controlled by controlling the flow rate and the temperature of the air flow.
The heating stretching assembly 41 comprises a first supporting frame 412 fixedly connected to the inner wall of the shell 1, a heating roller set 411 is rotatably arranged on the inner wall of the first supporting frame 412, and a plurality of first guide pipes 413 are arranged at two ends of the heating roller set 411.
Specifically, as shown in fig. 4, the heating roller set 411 includes a heating air duct 4112 rotatably connected to an inner wall of the first bracket 412, two ends of the heating air duct 4112 are fixed with a first bracket 4111 in a penetrating manner, three stretching rollers 4113 are rotatably disposed on opposite surfaces of the two first brackets 4111, two ends of the stretching rollers 4113 are connected in series through a first conduit 413, and one end of the corresponding stretching roller 4113 is connected to the corresponding side connecting pipe 35.
The heating dryer 4112 can assemble the air current of heating in the heating roller to evenly spout, combine the flow control of control by temperature change subassembly 3, keep the hot air current can be to the even heating of film body 2 surface, make its in-process that keeps the environment there is certain temperature, avoid ambient temperature to influence the temperature on film body 2 surface and cause great difference, reduce the influence of ambient temperature factor, and initiatively build suitable stretching environment.
Specifically, as shown in fig. 7, the cooling shaping assembly 42 includes a second retainer 4211 fixedly connected to the inner wall of the housing 1, the inner wall of the second retainer 4211 is rotatably connected to a cooling roller set 421, and a plurality of second pipes 423 are disposed on two sides of the cooling roller set 421.
By providing the second duct 423, the second duct 423 is rotatably connected to one end of the corresponding two cooling roller sets 421, and keeps the cooling roller sets 421 in series, keeps the air flow capable of flowing in sequence, and carries heat.
Specifically, as shown in fig. 5, the cooling roller set 421 includes a cooling air duct 4212 rotatably disposed on an inner wall of the second support 422, two ends of the cooling air duct 4212 are fixedly penetrated by the second holders 4211, a plurality of shaping rollers 4213 are rotatably disposed on opposite surfaces of the two second holders 4211, two ends of the plurality of shaping rollers 4213 are connected in series through a second conduit 423, and one end of the corresponding shaping roller 4213 is connected with another connecting pipe 35.
Through setting up cooling dryer 4212, cooling dryer 4212 can assemble the air current that is located the heat transfer of accomplishing in the sizing roller 4213 to keep the air current evenly dispersed, make it keep the air current velocity to film body 2 surface, make it in laminating sizing roller 4213 surface cooling down, the surface still has the air current of certain temperature to flow, in the synchronous even synchronous cooling of surface when cooling down step by step, promote the speed and the efficiency of cooling down.
Specifically, as shown in fig. 4, the differential assembly 51 includes a first disc wheel 511 rotatably connected to one end of a heating air duct 4112, a low-speed gear 512, a medium-speed pulley 513 and a high-speed gear 514 are disposed on a surface of the first disc wheel 511 in a transmission manner, the low-speed gear 512 and the high-speed gear 514 are in meshed transmission with the first disc wheel 511, the medium-speed pulley 513 is in transmission connection with the first disc wheel 511 through a belt, the low-speed gear 512, the medium-speed pulley 513 and the high-speed gear 514 are respectively fixed at one end of a corresponding stretching roller 4113 according to a contact transmission sequence of the film body 2, the low-speed gear 512, the medium-speed pulley 513 and the high-speed gear 514 respectively drive the corresponding stretching roller 4113 to rotate, and a rotation speed difference is formed between adjacent stretching rollers 4113.
The differential assembly 51 can change the elongation of the film body 2 by the rotation speed difference.
Specifically, as shown in fig. 5, the constant speed assembly 52 includes a second disc wheel 521 rotatably connected to one end of the cooling air duct 4212, two constant speed gears 522 are meshed with and driven by the surface of the second disc wheel 521, and a constant speed pulley 523 is connected to the second disc wheel 521 through a driving belt.
The two constant-speed gears 522 and the constant-speed belt pulley 523 are consistent with the diameter of the high-speed gear 514, so that synchronous rotation speed can be kept, the film body 2 after heating and stretching can be conveyed at a speed, speed difference can not occur, and the elongation is ensured to be in a stable state for cooling.
Specifically, as shown in fig. 10, the stretching roller 4113 and the shaping roller 4213 each comprise a heat conductive cylinder 41131, two ends of the heat conductive cylinder 41131 are respectively fixedly connected with an end pipe 41132, and a plurality of fins 41133 are fixedly attached to an inner wall of the heat conductive cylinder 41131.
The stretching roller 4113 and the shaping roller 4213 have the same structure, and include heat conductive cylinders 41131 which are in contact with the film body 2 and conduct heat, and end pipes 41132 at both ends thereof, which enable the rotational connection with the first conduit 413 or the second conduit 423, and fins 41133 on the inner wall of the heat conductive cylinders 41131, which enable faster heat exchange.
Specifically, as shown in fig. 4, the first disc wheel 511 and the second disc wheel 521 are in meshed transmission, the first disc wheel 511 is in meshed transmission with the driving gear 9, and the arc-shaped side walls of the first disc wheel 511 and the second disc wheel 521 are provided with a belt groove 7 for matching with belt transmission.
Through setting up belt groove 7, belt groove 7 is located the lateral wall of first rim plate and second rim plate and offers, can realize the cooperation with the belt, and first rim plate 511 and second rim plate 521 mesh each other, can keep the transmission each other when using, and this mode can realize heating stretching assembly 41 operation in-process, and cooling shaping assembly 42 can operate with it in step, realizes synchronous drive.
Specifically, as shown in fig. 9, the state limiting component 6 includes a pull frame 63 fixedly connected to one end of the heating air duct 4112, a height adjusting plate 65 is fixedly connected to a surface of the pull frame 63, the state limiting component 6 further includes a press frame 64 fixedly connected to one end of the cooling air duct 4212, the press frame 64 is attached to an upper surface of the height adjusting plate 65, a tension spring 62 is fixedly connected to an upper surface of the pull frame 63, an inclined frame 61 is fixedly connected to a top end of the tension spring 62, and the inclined frame 61 is fixedly connected to a top of the first support 412.
Through setting up the height-adjusting plate 65, when using, through changing different height-adjusting plates 65, can adjust the interval between pressure frame 64 and the frame 63, and pressure frame 64 holds the pressure of frame 63 at different distances, if height-adjusting plate 65 length shortens, then the extension of extension spring 62 is shorter, its constant speed gear 522 will contact first disc wheel 511, if height-adjusting plate 65 length increases, the extension of extension spring 62 needs bigger, the constant speed gear 522 that is relative to it needs to remove longer orbit and just can mesh with first disc wheel 511, can adjust its maximum stretching speed's scope according to the shape of different film body 2, can realize shutting down after the constant speed gear 522 meshes first disc wheel 511, in the shut down in-process, the shaft coupling of driver 8 can break and carry out synchronous outage protection state, can be when the sensor loses efficacy, its rotational speed out of control gets into protection state, avoid film body 2 to appear breaking.
The first wheel disc of the differential assembly 51 rotates under the meshing of the driver 8 and the driving gear 9, the first wheel disc simultaneously meshes with the low-speed gear 512 and the high-speed gear 514 on the surfaces to rotate reversely, the first wheel disc synchronously rotates through the belt with the medium-speed pulley 513, at the moment, the low-speed gear 512, the high-speed gear 514 and the medium-speed pulley 513 simultaneously rotate through the three stretching rollers 4113, the stretching rollers 4113 in the rotating state are mutually communicated in a rotating way from left to right through the first conduit 413, the heat provided by the temperature control assembly 3 firstly enters the leftmost stretching roller 4113 and then sequentially enters the rightmost stretching roller 4113 and then enters the heating air duct 4112, the film body 2 of the film body is sequentially attached to the surface of the stretching roller 4113 from right to left, the temperature of the stretching roller 4113 in contact gradually increases, firstly, the film body 2 is stretched under the rotation speed difference of the rightmost stretching roller 4113 and the middle stretching roller 4113, in the process, the film body 2 is sequentially heated and stretched for one time by the rightmost stretching roller 4113, then the middle stretching roller 4113 secondarily heats the film body 2 and stretches the film body 2 for the second time under the rotation speed difference with the leftmost stretching roller 4113, finally the leftmost stretching roller 4113 heats the film body 2 at the maximum temperature, so that the stress after stretching can be eliminated, the hot air flow gradually cooled from left to right is matched with the stretching matching gradually increased from right to left, and the film body 2 is conveyed and stretched under the guide of the hot air flow directionally sprayed by the heating air duct 4112, so that the temperature is kept uniform when the film body 2 is conveyed and stretched by the adjacent stretching roller 4113;
Meanwhile, after stretching, the film body 2 is sequentially contacted with the surfaces of the three shaping rollers 4213 of the cooling shaping assembly 42 from right to left, the shaping rollers 4213 sequentially flow from left to right in the second conduit 423, the temperature of the air flow is gradually heated in the flowing process, the heated air flow is uniformly blown out of the film body 2 through the cooling air cylinders 4212, the mode is matched with the second disc wheel 521 meshed with the first disc wheel 511 in the uniform speed assembly 52 to simultaneously carry out reverse rotation of the two constant speed gears 522 and simultaneously carry out synchronous rotation of the constant speed belt pulley 523, and then the three cooling rollers and the leftmost stretching roller 4113 are in the same-speed rotation state, so that the stretched film body 2 can be gradually cooled in the length keeping state, the film body 2 can be completely shaped after stress is eliminated step by step, the cooling shaping process is in the gradually reduced process, the quality of the film body 2 is ensured, the cooling is controlled, the cooling is more uniform, and the condition that the bonding caused by concentrated stress after winding is avoided is ensured;
When the device is used, two first disc wheels 511 and second disc wheels 521 which rotate in opposite directions have opposite acting forces on the heating roller group 411 and the cooling roller group 421, when the device is started, the driving gear 9 drives the first disc wheels 511 to rotate, the heating air cylinders 4112 and the cooling air cylinders 4212 of the heating roller group 411 and the cooling roller group 421 are respectively rotated on the inner walls of the first holding frame 4111 and the second holding frame 4211 by small amounts under the acting forces, wherein the pull frame 63 of the state limiting assembly 6 is fixed at one end of the heating air cylinder 4112, the press frame 64 is fixed at one end of the cooling air cylinder 4212, the force of opposite movements enables the press frame 64 to press the pull frame 63 through the regulating plate 65, the pull frame 63 pulls the tension spring 62 to stretch, after the tension spring 62 stretches, the high-speed gear 514 is meshed with the first disc wheels 511 and simultaneously moves, the high-speed gear 514 is separated from the second disc wheels 521, the rotation is realized, when the stretching amount of the tension spring 62 is increased along with the increase of the rotating speed, the right constant-speed gear 522 is meshed with the second disc wheels 521 gradually approaches the first disc wheels 4111, the right constant-speed gear 522 is easily, the right-speed gear 522 is meshed with the first disc wheels, and the right-side constant-speed wheels are easily to be cooled, and the cold-side film rolling machine is not fully stressed due to the fact that the cold-state condition is not can be fully stressed when the cold-state condition is caused by the fact that the cold-state condition is not has high-quality or the high-quality condition that the cold-quality is fully occurs when the cold-quality condition is fully and is fully heated by the high-quality condition or is due to the fact that the cold-stable condition is heated condition is high quality or is heated;
When the devices are damaged during the operation all the year round, the machine needs to be stopped and overhauled, and during the stopping process, the heating roller group 411 loses the direction acting force of the first wheel disc rotating process and the high-speed gear 514, the low-speed gear 512 and the medium-speed pulley 513, as shown in fig. 12, after losing the force, the tension spring 62 pulls the pull frame 63 and makes the heating air drum 4112 rotate, and meanwhile, the first holding frames 4111 on two sides of the heating air drum 4112 are meshed with the second wheel 521 with the high-speed gear 514, so that the whole locking is realized, and the displacement of the reverse movement of the film body 2 is avoided.
The acting force is elastically supported by the state limiting assembly 6, if the rotating speed is too high and exceeds the maximum stretching speed of the film body 2, the state limiting assembly 6 of the elastic support is displaced, so that a constant speed gear 522 of the state limiting assembly is clamped between the first disc wheel 511 and the second disc wheel 521, the shutdown is realized, the influence of the exceeding stretching speed on the quality caused by the setting error of process parameters is avoided, meanwhile, during the shutdown, the state limiting assembly 6 clamps the high speed gear 514 between the first disc wheel 511 and the second disc wheel 521, the reverse movement of the film body 2 during the shutdown is avoided, the film body 2 of each operation procedure during the shutdown is prevented from displacement, the production continuity during the restarting process is ensured, and the state limiting assembly 6 acts on the heating stretching assembly 41 to deflect when the film body 2 during the shutdown is matched, so that the film body 2 during the heating stretching process can be retracted and unloaded, the film breakage caused by insufficient temperature and continuous stretching action under the shutdown state is avoided, and the time period from the shutdown process to the reproduction is greatly ensured.
The scheme provides an effective solution to the problems of inaccurate temperature control, uneven stretching, stress concentration, film breakage during shutdown and the like in the traditional low-air-permeability film casting forming production line. Through the cooperation of differential subassembly 51 and uniform velocity subassembly 52, can realize accurate temperature regulation and control and the rotational speed difference control in the film stretching process, ensure the homogeneity of film stretching step by step, avoid local overstretch or not enough tensile problem. Meanwhile, the cooling shaping assembly 42 cools the film more uniformly by gradually cooling, so that the risk of stress concentration in the cooling process is reduced, and the thickness consistency and physical properties of the film are effectively improved. In addition, the state limiting component 6 can automatically prevent the film from being pulled reversely during the shutdown, and effectively relieve the tensile stress through a force unloading mechanism of the heating and stretching component 41, so as to prevent the film from breaking during the shutdown. The scheme not only reduces the waste of raw materials, but also greatly shortens the recovery time after shutdown, improves the production efficiency and the film quality, and ensures the stability and the continuity of the production line.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112793138A (en) * | 2020-12-22 | 2021-05-14 | 四川大学 | A gear-driven film synchronous biaxial stretching device and its supporting process method |
| CN118528528A (en) * | 2024-06-04 | 2024-08-23 | 重庆市綦江区壹合食品有限公司 | Forming die, equipment and process for backing material packaging stretching film |
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| US7442332B2 (en) * | 2004-05-04 | 2008-10-28 | Clopay Plastic Products Company, Inc. | Method and apparatus for uniformly stretching thermoplastic film and products produced thereby |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112793138A (en) * | 2020-12-22 | 2021-05-14 | 四川大学 | A gear-driven film synchronous biaxial stretching device and its supporting process method |
| CN118528528A (en) * | 2024-06-04 | 2024-08-23 | 重庆市綦江区壹合食品有限公司 | Forming die, equipment and process for backing material packaging stretching film |
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