Synchronous bidirectional stretching track for BOPP (biaxially-oriented polypropylene) film

Abstract

The utility model provides a synchronous two-way stretching track for a BOPP (biaxially-oriented polypropylene) film. The synchronous two-way stretching track comprises a rotating shaft, a preheating section, a stretching section, a shaping section, a sliding rail, a sliding block, a two-way screw rod and a driving assembly, when a film with another original size needs to be bidirectionally stretched, a preset value of the infrared distance measuring sensor corresponding to the distance between the two corresponding preheating sections is input into a control panel, and then a motor is started, so that the two-way screw rotates, the sliding block moves, and the film with the original size is bidirectionally stretched. When data detected by the infrared distance measuring sensor is consistent with a preset value, the motor stops; at the moment, the adjustment of the distance between the two preheating sections is completed; the problem that an original track has certain limitation on the original size requirement of the film is solved, and the use flexibility of the track is improved.

Description

Technical Field

[0001] This utility model relates to the field of BOPP film pressing technology, specifically to a synchronous bidirectional stretching track for BOPP film. Background Technology

[0002] BOPP film is widely used in various packaging fields due to its excellent printability and physical properties. Common types of BOPP film include ordinary type, heat-sealable type, cigarette packaging film, pearlescent film, metallized film, and matte film, which are mainly used for printing, bag making, and lamination with other substrates.

[0003] With economic development, more and more fields require high-strength, high-insulation optical-grade plastic films or ultra-thin plastic films. Therefore, biaxial stretching is introduced into the production process of BOPP film. Biaxial stretching is a relatively advanced plastic film production process. Plastic films obtained through biaxial stretching have smaller thickness and better performance, thereby meeting the higher performance requirements of the film.

[0004] In existing biaxial synchronous stretching devices for thin films, such as the patent document with patent number CN218803984U, a BOPP film synchronous biaxial stretching track is disclosed. This document can be adapted to films with different stretching requirements by adjusting the track spacing. However, in the above document, the spacing between the preheating sections is fixed. Therefore, there are certain limitations on the original size requirements of the film, which increases the limitations of the track's use. Utility Model Content

[0005] The purpose of this invention is to design a synchronous bidirectional stretching track for BOPP film to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: it includes a preheating section, a stretching section, and a shaping section connected in sequence by a rotating shaft; it also includes a slide rail mounted on the preheating section, a slider slidably connected to the slide rail, a bidirectional screw threadedly connected to the slider, and a drive assembly mounted on a base for driving the bidirectional screw to rotate. The slide rail is arranged along the axial direction of the preheating section, and the two sliders are respectively threadedly connected to two sections of the bidirectional screw with opposite directions of rotation.

[0006] Furthermore, the drive assembly includes a fixed lug fixed to the base, both ends of the bidirectional screw are rotatably connected to the fixed lug, a motor is fixedly connected to the fixed lug, and the output end of the motor is fixedly connected to one end of the bidirectional screw.

[0007] Furthermore, a baffle is fixedly connected to the slider, and a mounting plate is provided on the fixing ear. An infrared ranging sensor aligned with the baffle is fixedly connected to the mounting plate. Both the infrared ranging sensor and the motor are connected to the controller.

[0008] Furthermore, the controller is equipped with a control panel that allows setting the parameters of the infrared ranging sensor and starting the motor.

[0009] Furthermore, the slide rail is provided with several blind holes, a U-shaped plate is fixedly connected to the slider, a positioning rod that can be inserted into the blind holes is slidably connected to the inner bottom of the U-shaped plate, a permanent magnet is fixedly connected to the top of the positioning rod, an electromagnet is fixedly connected to the top of the U-shaped plate, and a tension spring is sleeved on the positioning rod, with both ends of the tension spring fixedly connected to the U-shaped plate and the permanent magnet, respectively.

[0010] Furthermore, limit rods are fixedly connected to both ends of the slide rail.

[0011] Furthermore, the mounting structure of the shaping section and the base adopts the mounting structure of the preheating section and the base.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the distance between the two preheating sections in this utility model will be adjusted under the rotation of the bidirectional screw, so that films of different original sizes can be stretched; it eliminates the problem that the original track has certain limitations on the original size requirements of the film, and increases the flexibility of track use. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the connection between the slider and the slide rail.

[0016] The components are: 1. Fixed ear; 2. Bidirectional screw; 3. Preheating section; 4. Stretching section; 5. Shaping section; 6. Motor; 7. Base; 8. Mounting plate; 9. Slide rail; 10. Slider; 11. Baffle; 12. Electromagnet; 13. Tension spring; 14. Positioning rod; 15. Blind hole; 16. U-shaped plate. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] Example: Please refer to Figure 1-2 A synchronous bidirectional stretching track for BOPP film, in addition to the existing preheating section 3, stretching section 4, and shaping section 5, includes a slider 10 and a slide rail 9 installed on each of the two preheating sections 3. The slide rail 9 is arranged along the axial direction of the preheating section 3. The two sliders 10 are respectively threaded to the two sections of the bidirectional screw 2 with opposite directions of rotation. Therefore, when the bidirectional screw 2 rotates, the two sliders 10 will move in opposite directions, thereby adjusting the distance between the two preheating sections 3. During this process, rotation will occur between the stretching section 4 and the shaping section 5, and between the preheating section 3 and the stretching section 4, causing the slide rail 9 to move on the slider 10, thus preventing jamming.

[0019] In some specific implementations, the drive assembly includes a fixed lug 1 fixed to the base 7, both ends of the bidirectional screw 2 being rotatably connected to the fixed lug 1, a motor 6 fixedly connected to the fixed lug 1, and the output end of the motor 6 being fixedly connected to one end of the bidirectional screw 2, thereby realizing the installation and driving of the bidirectional screw 2.

[0020] In some specific implementations, a baffle 11 is fixedly connected to the slider 10, and a mounting plate 8 is provided on the fixing ear 1. An infrared ranging sensor aligned with the baffle 11 is fixedly connected to the mounting plate 8. Both the infrared ranging sensor and the motor 6 are connected to the controller. Therefore, the formula for the distance between the two preheating sections 3 is: (distance from the infrared ranging sensor to the center of symmetry of the two preheating sections 3 - value fed back by the infrared ranging sensor) x 2 = distance between the two preheating sections 3. The size of the components used to correct this formula is not considered in detail here. Therefore, there is a meaningful correspondence between the distance between the two preheating sections 3 and the test data between the infrared ranging sensors. So when the value fed back by the infrared ranging sensor is equal to the set value, the controller will control the motor 6 to stop starting, thereby completing the adjustment of the distance between the two preheating sections 3.

[0021] The controller is equipped with a control panel that allows setting the infrared ranging sensor settings and starting the motor 6. The operator only needs to input the settings and start the motor, and the controller will control the motor 6 to start, thereby moving the preheating section 3 to the appropriate position.

[0022] In some specific implementations, the slide rail 9 is provided with several blind holes 15, and a U-shaped plate 16 is fixedly connected to the slider 10. A positioning rod 14 that can be inserted into the blind hole 15 is slidably connected to the inner bottom of the U-shaped plate 16. A permanent magnet is fixedly connected to the top of the positioning rod 14, and an electromagnet 12 is fixedly connected to the top of the U-shaped plate 16. A tension spring 13 is sleeved on the positioning rod 14, and the two ends of the tension spring 13 are respectively fixed to the U-shaped plate 16 and the permanent magnet, thereby fixing the preheating section 3 and preventing the preheating section 3 from sliding after adjustment. The depth of the blind hole 15 is less than the thickness of the bottom plate of the U-shaped plate 16, and the permanent magnet is slidably connected to the bottom of the U-shaped plate 16. The distance between the electromagnets 12 is greater than the depth of the blind hole 15 but less than the thickness of the base plate, thus ensuring that the positioning rod 14 can accurately disengage from the blind hole 15 without coming out of the base plate; the two ends of the slide rail 9 are fixed with limit rods to prevent the slider 10 from running out of the slide rail 9; and the installation structure of the shaping section 5 and the base 7 adopts the installation structure of the preheating section 3 and the base 7. Therefore, this utility model can adjust the distance between the two preheating sections 3 and the distance between the two shaping sections 5, thereby ensuring that it can stretch films of various original sizes while stretching a film of different sizes.

[0023] Working principle: When biaxial stretching of a film of another original size is required, simply input the preset value of the infrared ranging sensor corresponding to the distance between the two preheating sections 3 into the control panel, and then start the motor 6, which causes the biaxial screw 2 to rotate and the slider 10 to move. When the data detected by the infrared ranging sensor is consistent with the preset value, the motor 6 stops; at this time, the adjustment of the distance between the two preheating sections 3 is completed. This eliminates the problem that the original track has certain limitations on the original size requirements of the film and increases the flexibility of track use.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "upper," "lower," "left," "right," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A synchronous bidirectional stretching track for BOPP film, comprising a preheating section (3), a stretching section (4), and a shaping section (5) connected sequentially by a rotating shaft, characterized in that: It also includes a slide rail (9) mounted on the preheating section (3), a slider (10) slidably connected to the slide rail (9), a bidirectional screw (2) threadedly connected to the slider (10), and a drive assembly mounted on the base (7) for driving the bidirectional screw (2) to rotate. The slide rail (9) is arranged along the axial direction of the preheating section (3), and the two sliders (10) are respectively threadedly connected to the two sections of the bidirectional screw (2) with opposite directions of rotation.

2. The BOPP film synchronous bidirectional stretching track according to claim 1, characterized in that: The drive assembly includes a fixed lug (1) fixed to the base (7), the two ends of the bidirectional screw (2) are rotatably connected to the fixed lug (1), a motor (6) is fixed to the fixed lug (1), and the output end of the motor (6) is fixed to one end of the bidirectional screw (2).

3. The BOPP film synchronous bidirectional stretching track according to claim 2, characterized in that: A baffle (11) is fixedly connected to the slider (10), and an mounting plate (8) is provided on the fixing ear (1). An infrared ranging sensor aligned with the baffle (11) is fixedly connected to the mounting plate (8). The infrared ranging sensor and the motor (6) are both connected to the controller.

4. The BOPP film synchronous bidirectional stretching track according to claim 3, characterized in that: The controller is equipped with a control panel that allows setting the parameters of the infrared ranging sensor and starting the motor (6).

5. The BOPP film synchronous bidirectional stretching track according to claim 1, characterized in that: The slide rail (9) is provided with several blind holes (15), and a U-shaped plate (16) is fixedly connected to the slider (10). The bottom of the U-shaped plate (16) is slidably connected to a positioning rod (14) that can be inserted into the blind hole (15). A permanent magnet is fixedly connected to the top of the positioning rod (14), and an electromagnet (12) is fixedly connected to the top of the U-shaped plate (16). A tension spring (13) is sleeved on the positioning rod (14), and the two ends of the tension spring (13) are respectively fixed to the U-shaped plate (16) and the permanent magnet.

6. The BOPP film synchronous bidirectional stretching track according to claim 1, characterized in that: Limiting rods are fixed at both ends of the slide rail (9).

7. The BOPP film synchronous bidirectional stretching track according to any one of claims 1-6, characterized in that: The mounting structure of the shaping section (5) and the base (7) adopts the mounting structure of the preheating section (3) and the base (7).

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