CN216610031U - A kind of magnetic suspension film biaxial stretching device - Google Patents

Abstract

The invention discloses a magnetic suspension film biaxial stretching device which comprises a film blowing system, a primary cooling system, a slow pull roll, a heating system, a transverse stretching system, a fast pull roll, a secondary cooling system and a winding system, wherein all the parts are sequentially and horizontally arranged. The transverse stretching system mainly comprises an electromagnet monomer, a magnetic ball, a baffle, a driving gear, a change gear and a driven gear. The film enters a heating system after passing through a slow drawing roller, the magnetic suspension array is changed from an initial parallel position to an open position with a certain angle, and the magnetic balls suspended in the film are driven by the film external magnetic suspension array to jointly and transversely expand by utilizing the electromagnetic principle, so that the aim of transversely stretching the film can be fulfilled. The longitudinal stretching is realized by adjusting the speed difference between the slow pull roll and the fast pull roll. The utility model has the advantages of when guaranteeing that film biaxial stretching improves service performance, simplified the complicated structure of traditional biaxial stretching device to avoid the surface damage of tensile department film, reduce the production of waste material.

Description

A kind of magnetic suspension film biaxial stretching device

technical field

The invention relates to a plastic stretching and forming device, in particular to a bidirectional stretching device for a magnetic levitation film.

Background technique

Plastic film has developed into one of the plastic products with the largest output and the most varieties in my country. It is widely used in packaging, electronic appliances, agriculture, architectural decoration and daily necessities, and its output accounts for about 20% of the total plastic output. There are many molding methods for plastic films, such as calendering, blow molding, stretching and so on. Among them, biaxial stretching has become one of the methods that have attracted much attention in recent years. Compared with unstretched and uniaxially stretched films, the mechanical properties of plastic films produced by biaxial stretching technology are significantly improved. The tensile strength is 3-5 times that of the unstretched film, and the barrier properties, optical properties and heat resistance properties are improved.

Biaxial stretching of the film allows the film to be stretched by a certain multiple in the longitudinal and transverse directions under the action of the external force of the stretching machine within the appropriate temperature range above the glass transition temperature and below the melting point, so that the molecular chain or crystal plane is parallel to the film. It is oriented in the direction of the plane and arranged in an orderly manner, and then heat-set in a tensioned state to fix the oriented macromolecular structure, and finally the film can be obtained by cooling and subsequent treatment. The traditional film bidirectional synchronous stretching device is fixed on two annular rails and two transmission chain clips. As the distance between the transmission chain clips gradually increases, the distance between the two sides of the film driven by the transmission chain clips gradually increases. Large, to achieve transverse stretching of the film. During the longitudinal stretching process, each annular track includes an inner rail and an outer rail arranged outside the inner rail. The distance between the inner rail and the outer rail gradually decreases from front to back, and the transmission chain clip runs on the stretching section. At this time, the included angle of the adjacent chain plates of the transmission chain clip increases accordingly, resulting in an increase in the distance between the clips connected to the adjacent chain plates, thereby realizing the longitudinal stretching of the film. However, in the traditional chain-clamp type film biaxial stretching process, the structure of the film bidirectional synchronous stretching device is complex, and it is difficult to ensure the surface quality of the film at the clamp, resulting in unnecessary cost loss.

Therefore, how to improve the performance of the biaxially stretched film while avoiding the surface damage of the stretched film and reducing the generation of waste is a key problem to be solved in the current biaxially stretched film forming method.

SUMMARY OF THE INVENTION

Aiming at the problems of uneven strength of the existing polymer film in uniaxial stretching and easy breakage at the film clamp during biaxial stretching, the present invention proposes a biaxial stretching device for magnetic suspension films, which stretches the film synchronously in the transverse direction and the longitudinal direction. Among them, the transverse stretching uses electromagnetism to generate transverse tension, and the film is stretched by the electromagnetic generator outside the film and the magnetic ball inside the film. The performance of the biaxially stretched film can be avoided, and the surface of the film at the stretched position of the fixture can be prevented from being damaged, and the generation of waste materials can be reduced.

Technical scheme of the present invention: a magnetic levitation film biaxial stretching device, including a film blowing system, a primary cooling system, a slow-drawing roller, a heating system, a transverse stretching system, a fast-drawing roller, a secondary cooling system and a winding system, each of which is Part of the composition is arranged horizontally in the order of blown film system, primary cooling system, slow drawing roller, heating system, transverse drawing system, fast drawing roller, secondary cooling system and winding system. Among them, the blown film system mainly includes extruder, air hole, die head and film lead roll. The transverse stretching system mainly includes electromagnet unit, magnetic ball, baffle, driving gear, direction changing gear and driven gear. In the film blowing system, the blowing film drive motor provides power to drive the screw of the extruder to rotate, and the material to be processed is heated in the barrel to a molten state and extruded at the die head. The film is initially stretched under the inflating action of the air pump and the pulling action of the film-inducing roller, resulting in an initial film with a certain blow-up ratio. Through traction, the film passes through the primary cooling system, which includes three vertically arranged cooling rollers. The film is fully cooled to room temperature under the action of the primary cooling system, and then the film passes through the slow-drawing roller. At this time, the slow-drawing roller should maintain a low speed It only plays the role of traction. After the slow drawing roller, the film enters the heating system. The heating system includes a preheating zone, a stretching zone and a setting zone. The temperature of the stretching zone is higher, followed by the preheating zone and the setting zone. The transverse stretching system is placed in the stretching area of the heating system. The transverse stretching system includes a magnetic levitation array, several magnetic balls, a magnetic levitation array drive motor, a driving gear, a direction-changing gear and a driven gear, wherein the magnetic levitation array is composed of several electromagnetic suspensions. It is composed of iron monomers. Each electromagnet monomer is arranged at a horizontal interval of 4-5cm. The end of the electromagnet monomer is provided with a circular groove. The diameter of the groove is larger than the diameter of the magnetic ball. The surface is attached with aluminum foil tape to increase the groove. Surface smoothness, reducing friction with longitudinally passing films. The number of magnetic balls is the same as the number of electromagnets. Considering that when the diameter of the magnetic ball is small, it is difficult to control, and when the diameter is too large, it is easy to fall under the influence of gravity, so a magnetic ball with a diameter of 3-4cm is selected. There are horizontally arranged baffles on the magnetic suspension array. The length of the baffles is the same as the length of the magnetic suspension array. There are limit slots on the baffles. Catch the falling magnetic ball and roll it into the limit slot. There are driven gears at the bottom of the baffle plate, which are arranged just below the magnetic ball at the starting end, and are coaxial with the magnetic ball at the starting end in the vertical direction. changes happened. After the film is manually pulled through the preheating zone, it enters the stretching zone. At this time, the magnetic levitation arrays on both sides of the film in the transverse stretching system are in parallel positions. When the film passes through the starting end of the magnetic levitation array, the magnetic levitation array enters the debugging state, and the magnetic ball is manually moved. Put them into the film in turn, the inner magnetic balls are attracted together with the electromagnet outside the film in turn under the action of magnetic force. When all the magnetic balls are put into the film, the temperature control switch of the stretching area is turned on, and the film is heated to a high elastic state in the stretching area. , turn on the magnetic suspension array drive motor, and adjust the rotation of the motor shaft through the control circuit, the driving gear rotates with the corresponding angle of the motor shaft, in the magnetic suspension array, one side of the driven gear directly meshes with the driving gear, and the other side of the driven gear changes After the tooth path meshes with the driving gear, the driven gears on both sides turn in opposite directions. Driven by the driven gear, the magnetic levitation arrays on both sides expand laterally, and the magnetic levitation arrays change from the initial parallel position to a certain angle. After the stretching ratio is adjusted, the magnetic levitation drive motor is turned off, and the magnetic levitation arrays on both sides are arranged in a "figure-eight" shape, so as to achieve the purpose of transversely stretching the film. The longitudinal stretching of the film relies on the slow-drawing roller and the fast-drawing roller, and the purpose of longitudinal stretching of the film is achieved by adjusting the speed difference between the slow-drawing roller and the fast-drawing roller. After biaxial stretching, the film enters the secondary cooling system, and its structure is the same as that of the primary cooling system. After the film is cooled to room temperature, it is collected and rolled by the winding system.

The invention is a bidirectional stretching device for a magnetic suspension film. The transverse stretching utilizes the electromagnetic principle, and the magnetic balls suspended in the film are driven by the magnetic suspension array outside the film to expand laterally together, so as to achieve the purpose of transversely stretching the film. At the same time, longitudinal stretching relies on adjusting the speed difference between the slow-drawing roller and the fast-drawing roller to achieve the purpose of longitudinally stretching the film. While ensuring the biaxial stretching of the film to improve the performance, the complex structure of the traditional biaxial stretching device is simplified, and the surface damage of the film at the stretching place is avoided, thereby reducing the generation of waste.

Description of drawings

FIG. 1 is a front view of a magnetic suspension film biaxial stretching device of the present invention.

FIG. 2 is a top view of a magnetic suspension film biaxial stretching device of the present invention.

3 is a schematic diagram of a film blowing system of a magnetic levitation film biaxial stretching device of the present invention.

4 is a schematic diagram of a transverse stretching system of a magnetic suspension film biaxial stretching device of the present invention.

5 is a side view of a magnetic suspension array of a magnetic suspension film biaxial stretching device of the present invention.

In the figure: 1—blown film system; 1-1—extruder; 1-2—air hole; 1-3—die head; 1-4—traction roller; 2—primary cooling system; 3—slow drawing roller; 4 - heating system; 5 - transverse stretching system; 5-1 - electromagnet unit; 5-2 - magnetic ball; 5-3 - baffle plate; 6 - fast pulling roller; 7 - secondary cooling system; 8 - closing Reel system; 9—drive gear; 10—change gear; 11—driven gear.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

The present invention relates to a magnetic suspension film bidirectional stretching device, as shown in Figures 1 and 2, which mainly includes a film blowing system 1, a primary cooling system 2, a slow stretching roller 3, a heating system 4, a transverse stretching system 5, and a fast stretching roller 6. Secondary cooling system 7 and winding system 8, wherein the blown film system 1 mainly includes extruder 1-1, air hole 1-2, die 1-3, traction roller 1-4, as shown in Figure 3, The transverse stretching system 5 mainly includes an electromagnet unit 5-1, a magnetic ball 5-2, a baffle plate 5-3, a driving gear 9, a direction changing gear 10 and a driven gear 11, as shown in FIGS. 4 and 5 . In the present invention, the composition of each part is in the order of blown film system 1, primary cooling system 2, slow stretching roll 3, heating system 4, transverse stretching system 5, fast stretching roll 6, secondary cooling system 7 and winding system 8. in order. In the blown film system 1, the blown film drive motor provides power to drive the screw of the extruder to rotate, and the material to be processed is heated in the barrel to a molten state and extruded at the die 1-3, and the center of the die 1-3 is provided with air holes 1-2, the air flow is blown out from the air hole 1-2, and the film is initially stretched under the inflating action of the air pump and the pulling action of the pulling roller 1-4, resulting in an initial film with a certain inflation ratio. By pulling, the film passes through the primary cooling system 2, which consists of three vertically arranged cooling rollers, and the film is fully cooled to room temperature under the action of the primary cooling system. Then the film passes through the slow-drawing roller 3. At this time, the slow-drawing roller 3 should maintain a low speed state and only play the role of traction. After passing through the slow-drawing roller 3, the film enters the heating system 4. The heating system 4 includes a preheating zone and a stretching zone. And the setting zone, wherein the temperature of the stretching zone is higher, followed by the preheating zone and the setting zone, the transverse stretching system 5 is placed in the stretching zone in the heating system 4, and the transverse stretching system 5 includes a magnetic suspension array, a magnetic ball 5- 2. Several, magnetic suspension array drive motor, driving gear 9, direction changing gear 10 and driven gear 11, wherein the magnetic suspension array is composed of several electromagnet units 5-1, and each electromagnet unit 5-1 is horizontally spaced by 4- 5cm layout, the end of electromagnet unit 5-1 is provided with a circular groove, the diameter of the groove is larger than the diameter of the magnetic ball 5-2, and the surface is attached with aluminum foil tape, which can increase the surface smoothness of the groove and reduce the longitudinal passage. friction between the films. The number of magnetic balls 5-2 is the same as the number of electromagnets 5-1. Considering that when the diameter of the magnetic ball 5-2 is small, it is difficult to control, and when the diameter is too large, it is easy to fall under the influence of gravity, so the magnetic ball 5-2 The selected diameter is 3-4cm. The magnetic suspension array is provided with a horizontally arranged baffle 5-3. The length of the baffle 5-3 is the same as that of the magnetic suspension array. The baffle 5-3 is provided with a limit slot. When the magnetic force of the iron monomer 5-2 is reduced and dropped, the baffle 5-3 can catch the dropped magnetic ball 5-2 and make it roll down into the limit slot, as shown in Figure 5. The bottom ends of the baffles 5-3 are respectively provided with driven gears 11. The driven gears 11 are arranged just below the starting end magnetic ball and are vertically coaxial with the starting end magnetic ball. When the driven gears 11 on both sides rotate, the two The position of the magnetic ball at the side start does not change, and no lateral displacement occurs, as shown in Figures 1 and 4. When the film is manually pulled through the preheating zone, it enters the stretching zone. At this time, the magnetic suspension array in the transverse stretching system 5 is in a parallel position. When the film passes through the beginning of the magnetic suspension array, the magnetic suspension array enters the debugging state, and the magnetic ball 5 is manually moved. -2 are put into the film in turn, the inner magnetic ball 5-2 is attracted together with the outer electromagnet 5-1 under the action of magnetic force, when all the magnetic balls are put into the film, turn on the temperature control switch of the stretching area, the film When the stretching area is heated to a high elastic state, the magnetic levitation array drive motor is turned on, and the rotation of the motor shaft is adjusted through the control circuit, and the driving gear 9 rotates with the corresponding angle of the motor shaft. In the magnetic levitation array, one driven gear 11 is directly connected to the driving gear 9 After the driven gear 11 on the other side meshes with the driving gear 9 through the changing gear path 10, the driven gears 11 on both sides turn in opposite directions. After reaching the specified stretching ratio, turn off the magnetic levitation drive motor, and the magnetic levitation arrays on both sides are arranged in a "figure-eight" arrangement, so as to achieve the purpose of transverse stretching of the film, see As shown in Figures 2 and 3. The longitudinal stretching of the film relies on the slow-drawing roll 3 and the fast-drawing roll 6, and the purpose of longitudinal stretching of the film is achieved by adjusting the speed difference between the slow-drawing roll 3 and the fast-drawing roll 6. After biaxial stretching, the film enters the secondary cooling system 7. The secondary cooling system 7 has the same structure as the primary cooling system 2. After the film is cooled to room temperature, it is collected into a roll by the winding system 8.

Claims (4)

1. A magnetic levitation film bidirectional stretching device is characterized in that: comprising a film blowing system, a primary cooling system, a slow-drawing roller, a heating system, a transverse stretching system, a fast-drawing roller, a secondary cooling system and a winding system, each Part of the composition is arranged horizontally in the order of blown film system, primary cooling system, slow stretching roll, heating system, transverse stretching system, fast stretching roll, secondary cooling system, and winding system. The blown film system mainly includes extruder. , air hole, die head and film pulling roller, the transverse stretching system mainly includes electromagnet unit, magnetic ball, baffle, driving gear, direction changing gear and driven gear; in the film blowing system, the blowing film drive motor provides power The screw of the extruder is driven to rotate, and the material to be processed is heated in the barrel to a molten state and extruded at the die head. There is an air hole in the center of the die head, and the air flow is blown out from the air hole. It is initially stretched to produce an initial film with a certain blow-up ratio; the initial film passes through a primary cooling system, which includes three vertically arranged cooling rolls, and the film is fully cooled to room temperature under the action of the primary cooling system, and then the film passes through Slow-drawing roller, after the slow-drawing roller, the film enters the heating system. The heating system includes a preheating zone, a stretching zone and a setting zone. The temperature of the stretching zone is higher, followed by the preheating zone and the setting zone. In the stretching area of the heating system, the transverse stretching system includes a magnetic suspension array, several magnetic balls, a magnetic suspension array drive motor, a driving gear, a changing gear and a driven gear, wherein the magnetic suspension array is composed of several uniformly distributed electromagnets. The end of the single electromagnet is provided with a circular groove, and the diameter of the groove is larger than that of the magnetic ball; the number of magnetic balls is the same as that of the single electromagnet, and the magnetic suspension array is provided with a horizontally arranged baffle, and the length of the baffle is the same as that of the electromagnet. The length of the magnetic suspension array is the same, the baffle is provided with a limit slot, and the bottom end of the baffle is respectively provided with a driven gear, which is arranged just below the magnetic ball at the starting end, and is coaxial with the magnetic ball at the starting end in the vertical direction, and the driving gear follows the motor. The shaft rotates at the corresponding angle. In the magnetic levitation array, the driven gear on one side meshes with the driving gear directly, and the driven gear on the other side meshes with the driving gear through the changing gear path. The stretching relies on slow-drawing rollers and fast-drawing rollers. After biaxial stretching, the film enters the secondary cooling system. The structure of the secondary cooling system is the same as that of the primary cooling system. After the film is cooled to room temperature, it is collected into a roll by the winding system. 2 . The magnetic suspension film biaxial stretching device according to claim 1 , wherein the electromagnet monomers are arranged at a horizontal interval of 4-5 cm. 3 . 3 . The biaxial stretching device for magnetic levitation films according to claim 1 , wherein the surface of the circular groove provided at the end of the electromagnet monomer is affixed with an aluminum foil tape. 4 . 4. a kind of magnetic suspension film biaxial stretching device according to claim 1 is characterized in that: the diameter of the magnetic ball is 3-4cm.

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