A cast film production line

Abstract

The present invention discloses a cast film production line, including a frame, a cast film head, a cast film air knife, a cooling and shaping roller group, a quick-cooling heat-conducting roller, a through-flow heat-conducting pipe, a variable-speed water pump, a coolant tank, a temperature sensor, a stripping roller group, a stripping air knife, a pressure sensing roller, a thickness measuring mechanism and a traction and leveling roller group. The present invention enables the production line cooling device to automatically monitor and control the temperature cooling temperature on both sides of the cast film, thereby avoiding shrinkage wrinkles caused by the temperature difference of the cast film. The use of roller group transfer combined with hot air flow purge stripping can maintain the cast film to be continuously and stably stripped, thereby avoiding deformation of the cast film due to pulling force, and is conducive to improving the production quality of the cast film.

Description

[Technical field]

[0001] The invention relates to the technical field of cast film production equipment, in particular to the technical field of a cast film production line. [Background technology]

[0002] Cast film is a non-stretched, non-directional flat extruded film produced by quenching the melt. There are two types of cast film: single-layer cast film and multi-layer co-extrusion cast film. Compared with blown film, it is characterized by fast production speed and high output. The transparency, glossiness and thickness uniformity of the film are excellent. It is one of the main packaging composite substrates and is used to produce high-temperature cooking films, vacuum aluminum-plated films, etc. The market is very optimistic. Moreover, with the development of domestic cast film production equipment, some of its technical indicators have reached the international advanced level. In the field of cast film machines, the automation level and stability of my country's cast film production lines need to be further improved. When continuously produced, if there is a temperature difference in the film temperature after cooling, internal shrinkage will occur after winding, and the film will deform and wrinkle. The existing stripping device for cast film production is usually a stripping roller that reciprocates up and down to pull the cast film away from the cast roller, thereby achieving a stripping effect. However, the stripping roller that continuously reciprocates up and down will intermittently apply external force to the cast film, which can easily cause the cast film to deform due to the pulling force. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a cast film production line, which enables the cooling device of the production line to automatically monitor and control the cooling temperature on both sides of the cast film to avoid shrinkage wrinkles caused by temperature differences in the cast film. The use of roller group transfer combined with hot air flow blowing and peeling can maintain continuous and stable peeling of the cast film, avoid deformation of the cast film due to pulling force, and help improve the production quality of the cast film.

[0004] To achieve the above-mentioned purpose, the present invention proposes a cast film production line, including a frame, a cast head, a cast air knife, a cooling and shaping roller group, a rapid cooling heat conduction roller, a flow heat conduction pipe, a variable speed water pump, a coolant tank, a temperature sensor, a stripping roller group, a stripping air knife, a pressure sensing roller, a thickness measuring mechanism and a traction and leveling roller group. The frame is provided with a cast head on the top, a cooling and shaping roller group is provided on the left side of the cast head, a cast air knife is provided between the cast head and the cooling and shaping roller group, the cooling and shaping roller group is composed of a plurality of rapid cooling heat conduction rollers parallel to each other, and the rapid cooling heat conduction rollers are evenly interspersed with A through-flow heat-conducting pipe, the through-flow heat-conducting pipe is connected to the coolant tank through a variable-speed water pump, a plurality of temperature sensors are clamped on the inner side wall of the rapid-cooling heat-conducting roller, the temperature sensor is connected to the variable-speed water pump, a stripping roller group is arranged on the left side of the cooling and shaping roller group, a stripping air knife is arranged on the right side of the stripping roller group, the stripping air knife is directly facing the adjacent rapid-cooling heat-conducting roller, a pressure sensing roller in contact with the lower side of the cast film is arranged on the left side of the stripping air knife, the pressure sensing roller is connected to the stripping air knife, a thickness measuring mechanism is arranged on the left side of the stripping roller group, and a traction and leveling roller group is arranged on the left side of the thickness measuring mechanism.

[0005] Preferably, both ends of the casting air knife are installed on the top of the frame through electric positioners, and the electric positioner is connected to the thickness measuring mechanism.

[0006] Preferably, the number of the rapid cooling heat-conducting rollers is at least three, the rapid cooling heat-conducting rollers are stainless steel rollers, and the outer side surfaces of the rapid cooling heat-conducting rollers are smooth mirror surfaces.

[0007] Preferably, a plurality of heat-conducting aluminum fins are evenly and densely arranged inside the quick-cooling heat-conducting roller, and the flow-through heat-conducting pipes are evenly interspersed on the heat-conducting aluminum fins. The flow-through heat-conducting pipes are copper pipes, and a shut-off solenoid valve is provided at the connection between the flow-through heat-conducting pipes and the variable-speed water pump.

[0008] Preferably, the blowing direction of the stripping air knife is arranged along the circumferential tangent of the rapid-cooling heat-conducting roller, and the air flow pressure of the stripping air knife is adjustable.

[0009] Preferably, the stripping roller group is an active roller group, and the driving motor used by the stripping roller group is a variable speed motor.

[0010] Preferably, the pressure sensing roller is a driven rubber-coated roller, both ends of the pressure sensing roller are connected with pressure sensors, and the pressure sensors are respectively connected to the stripping air knife and the stripping roller group.

[0011] Preferably, the traction and leveling roller group includes a plurality of groups of rubber-coated rollers that are symmetrically extruded in the upper and lower parts, and the extrusion gaps between the rubber-coated rollers in the same group are adjustable.

[0012] The beneficial effects of the present invention are as follows: the present invention combines a frame, a casting head, a casting air knife, a cooling and shaping roller group, a quick-cooling heat-conducting roller, a flow-through heat-conducting pipe, a variable-speed water pump, a coolant tank, a temperature sensor, a peeling roller group, a peeling air knife, a pressure-sensing roller, a thickness measuring mechanism and a traction and smoothing roller group together, and after experimental optimization, enables the production line cooling device to automatically monitor and control the temperature cooling temperature on both sides of the cast film to avoid shrinkage wrinkles caused by temperature differences in the cast film. The use of roller group transfer combined with hot air flow blowing and peeling can maintain continuous and stable peeling of the cast film, avoid deformation of the cast film due to pulling force, and help improve the production quality of the cast film.

[0013] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0014] Figure 1 It is a structural schematic diagram of a cast film production line of the present invention.

[0015] In the figure: 1-frame, 2-casting machine head, 3-casting air knife, 4-cooling and shaping roller group, 5-speed cooling heat conduction roller, 6-through flow heat conduction pipe, 7-variable speed water pump, 8-cooling liquid tank, 9-temperature sensor, 10-peeling roller group, 11-peeling air knife, 12-pressure sensing roller, 13-thickness measuring mechanism, 14-traction and leveling roller group, 15-electric indexer, 16-thermal conductive aluminum fins, 17-pressure sensor. [Specific implementation method]

[0016] See also Figure 1The present invention provides a cast film production line, comprising a frame 1, a cast head 2, a cast air knife 3, a cooling and shaping roller group 4, a quick-cooling heat-conducting roller 5, a flow-through heat-conducting pipe 6, a variable-speed water pump 7, a coolant tank 8, a temperature sensor 9, a stripping roller group 10, a stripping air knife 11, a pressure sensing roller 12, a thickness measuring mechanism 13 and a traction and leveling roller group 14. The frame 1 is provided with a cast head 2 on the top, a cooling and shaping roller group 4 is provided on the left side of the cast head 2, a cast air knife 3 is provided between the cast head 2 and the cooling and shaping roller group 4, the cooling and shaping roller group 4 is composed of a plurality of quick-cooling heat-conducting rollers 5 parallel to each other, and the quick-cooling heat-conducting rollers 5 are provided with a plurality of quick-cooling heat-conducting rollers 5 parallel to each other. The cylinder 5 is evenly interspersed with flow-through heat-conducting pipes 6, and the flow-through heat-conducting pipes 6 are connected to the coolant tank 8 through a variable-speed water pump 7. The inner wall of the quick-cooling heat-conducting roller 5 is clamped with a plurality of temperature sensors 9, and the temperature sensors 9 are connected to the variable-speed water pump 7. A stripping roller group 10 is arranged on the left side of the cooling and shaping roller group 4, and a stripping air knife 11 is arranged on the right side of the stripping roller group 10, and the stripping air knife 11 is directly facing the adjacent quick-cooling heat-conducting roller 5. A pressure sensing roller 12 in contact with the lower side of the cast film is arranged on the left side of the stripping air knife 11, and the pressure sensing roller 12 is connected to the stripping air knife 11. A thickness measuring mechanism 13 is arranged on the left side, and a traction leveling roller group 14 is arranged on the left side of the thickness measuring mechanism 13. Both ends of the casting air knife 3 are installed on the top of the frame 1 through an electric indexer 15, and the electric indexer 15 is connected to the thickness measuring mechanism 13. The number of the quick-cooling heat-conducting rollers 5 is at least three, and the quick-cooling heat-conducting rollers 5 are stainless steel rollers. The outer side of the quick-cooling heat-conducting rollers 5 is a smooth mirror surface. The interior of the quick-cooling heat-conducting rollers 5 is uniformly and densely arranged with a plurality of heat-conducting aluminum fins 16. The through-flow heat-conducting pipes 6 are uniformly interspersed on the heat-conducting aluminum fins 16. The through-flow heat-conducting pipes 6 are copper pipes. A shut-off solenoid valve is provided at the connection with the variable speed water pump 7, the blowing direction of the stripping air knife 11 is set along the circumferential tangent of the quick-cooling heat-conducting roller 5, the air flow pressure of the stripping air knife 11 is adjustable, the stripping roller group 10 is an active roller group, the driving motor used by the stripping roller group 10 is a variable speed motor, the pressure sensing roller 12 is a driven rubber-coated roller, and pressure sensors 17 are connected to both ends of the pressure sensing roller 12. The pressure sensors 17 are respectively connected to the stripping air knife 11 and the stripping roller group 10, and the traction and leveling roller group 14 includes a plurality of groups of rubber-coated rollers that are symmetrically extruded up and down, and the extrusion gap between the rubber-coated rollers in the same group is adjustable.

[0017] The working process of the present invention is as follows: the casting head 2 feeds the material, the casting air knife 3 cooperates with the cooling shaping roller group 4 to form the casting film to cool down, the quick-cooling heat-conducting roller 5 cools down the casting film through surface contact, and the heat is transferred to the through-flow heat-conducting pipe 6 through the heat-conducting aluminum fins 16. The heat is transferred in the through-flow heat-conducting pipe 6 through the fast-circulating coolant. The temperature sensor 9 monitors the temperature of the quick-cooling heat-conducting roller 5 to control the variable speed water pump 7 to change the flow rate of the coolant, and then changes the temperature of the corresponding quick-cooling heat-conducting roller 5 to achieve a dynamic temperature balance, thereby avoiding the temperature difference of the casting film. The stripping roller group 10 strips the cast film on the cooling and shaping roller group 4 evenly by continuous winding, and the stripping air knife 11 blows air to the adhesion part of the cast film to assist stripping. The pressure sensing roller 12 determines whether the cast film is completely stripped by pressure sensing. When the pressure of the pressure sensing roller 12 is too small, the air flow pressure and flow rate of the stripping air knife 11 increase, and the adhesion part of the cast film is blown with strong air flow to assist stripping, which can maintain continuous and stable stripping of the cast film, avoid deformation of the cast film due to pulling force, and help improve the production quality of the cast film.

[0018] The present invention combines a frame 1, a casting head 2, a casting air knife 3, a cooling and shaping roller group 4, a quick-cooling heat-conducting roller 5, a flow-through heat-conducting pipe 6, a variable-speed water pump 7, a coolant tank 8, a temperature sensor 9, a stripping roller group 10, a stripping air knife 11, a pressure sensing roller 12, a thickness measuring mechanism 13 and a traction and smoothing roller group 14 together, and after experimental optimization, the production line cooling device can automatically monitor and control the temperature cooling temperature on both sides of the cast film to avoid shrinkage wrinkles caused by temperature differences in the cast film. The use of roller group transfer combined with hot air flow blowing and stripping can maintain continuous and stable stripping of the cast film, avoid deformation of the cast film due to pulling force, and help improve the production quality of the cast film.

[0019] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A cast film production line, Features: The invention comprises a frame (1), a casting head (2), a casting air knife (3), a cooling and shaping roller group (4), a rapid cooling heat-conducting roller (5), a flow-through heat-conducting pipe (6), a variable speed water pump (7), a cooling liquid tank (8), a temperature sensor (9), a peeling roller group (10), a peeling air knife (11), a pressure sensing roller (12), a thickness measuring mechanism (13) and a traction and leveling roller group (14). The frame (1) is provided with a casting head (2) on the top, a cooling and shaping roller group (4) is provided on the left side of the casting head (2), a casting air knife (3) is provided between the casting head (2) and the cooling and shaping roller group (4), the cooling and shaping roller group (4) is composed of a plurality of rapid cooling heat-conducting rollers (5) parallel to each other, the rapid cooling heat-conducting rollers (5) are evenly interspersed with flow-through heat-conducting pipes (6), the flow-through heat-conducting pipes (6) are evenly interspersed in the rapid cooling heat-conducting rollers (5), and the flow-through heat-conducting pipes (6) are evenly interspersed in the flow-through heat-conducting rollers (6). The heat transfer pipe (6) is connected to the cooling liquid tank (8) through a variable speed water pump (7); a plurality of temperature sensors (9) are clamped on the inner wall of the quick cooling heat transfer roller (5); the temperature sensors (9) are connected to the variable speed water pump (7); a stripping roller group (10) is arranged on the left side of the cooling and shaping roller group (4); a stripping air knife (11) is arranged on the right side of the stripping roller group (10); the stripping air knife (11) is directly facing the adjacent quick cooling heat transfer roller (5); a pressure sensing roller (12) in contact with the lower side of the cast film is arranged on the left side of the stripping air knife (11); the pressure sensing roller (12) is connected to the stripping air knife (11); a thickness measuring mechanism (13) is arranged on the left side of the stripping roller group (10); and a traction and leveling roller group (14) is arranged on the left side of the thickness measuring mechanism (13).

2. A cast film production line as claimed in claim 1, Features: The two ends of the casting air knife (3) are installed on the top of the frame (1) through an electric indexer (15), and the electric indexer (15) is connected to the thickness measuring mechanism (13).

3. A cast film production line as claimed in claim 1, Features: The number of the quick-cooling heat-conducting rollers (5) is at least three, the quick-cooling heat-conducting rollers (5) are stainless steel rollers, and the outer side surfaces of the quick-cooling heat-conducting rollers (5) are smooth mirror surfaces.

4. A cast film production line as claimed in claim 1, Features: A plurality of heat-conducting aluminum fins (16) are uniformly and densely arranged inside the quick-cooling heat-conducting roller (5); the through-flow heat-conducting pipe (6) is uniformly interspersed on the heat-conducting aluminum fins (16); the through-flow heat-conducting pipe (6) is a copper pipe; and a shut-off solenoid valve is arranged at the connection between the through-flow heat-conducting pipe (6) and the variable speed water pump (7).

5. A cast film production line as claimed in claim 1, Features: The blowing direction of the stripping air knife (11) is arranged along the circumferential tangent of the quick-cooling heat-conducting roller (5), and the air flow pressure of the stripping air knife (11) is adjustable.

6. A cast film production line as claimed in claim 1, Features: The stripping roller group (10) is an active roller group, and the driving motor used by the stripping roller group (10) is a variable speed motor.

7. A cast film production line as claimed in claim 1, Features: The pressure sensing roller (12) is a driven rubber-coated roller. Both ends of the pressure sensing roller (12) are connected with pressure sensors (17). The pressure sensors (17) are respectively connected to the stripping air knife (11) and the stripping roller group (10).

8. A cast film production line as claimed in claim 1, Features: The traction and leveling roller group (14) comprises a plurality of groups of rubber-coated rollers that are symmetrically extruded in the upper and lower parts, and the extrusion gaps between the rubber-coated rollers in the same group are adjustable.

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