A biaxial stretching device for film production and a method of using the same

Abstract

The application relates to a bidirectional stretching device for film production and a use method thereof applied to the field of film processing, which comprises a longitudinal stretching device and a transverse stretching device, the transverse stretching device comprises an upper clamp and a lower clamp, the upper clamp and the lower clamp are both installed on a rack, the upper clamp and the lower clamp both comprise a plurality of chain wheels, the stretching length of the film can be changed by replacing the gear on the stretching head, so that the film production demand of different specifications is met, and the diversified processing capacity of the film is improved; when the gears on the multiple stretching heads are of the same specification, the stretching lengths of different parts of the film are consistent; when the gears on the multiple stretching heads are set to different specifications, the stretching widths of the film corresponding to the multiple stretching heads are different, different regions of the film have different stretching rates, the film preparation process with specific design requirements for local thickness, stress distribution or surface structure is suitable, and the diversified processing capacity of the film is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of two-way stretching device, in particular to a kind of two-way stretching device for film production and its use method applied in film processing field. BACKGROUND

[0002] In the film production process, two-way stretching process is an important means to improve the physical properties of film, widely used in the preparation of high-performance materials such as packaging film, optical film, the traditional two-way stretching device generally uses fixed track clamping structure, through mechanical pull rod or motor mechanism to stretch the film vertically and horizontally.

[0003] The Chinese patent application with publication number CN102626986A discloses a longitudinal stretching machine for two-way stretching film, the invention can accurately control the speed of each roller by driving the rotation of each roller in the preheating roller group, stretching roller group and heat preservation shaping roller group by servo motor, the invention disclosed by Chinese patent discloses that the film is clamped by clip and moved on the inclined second guide rail to complete the horizontal stretching of the film.

[0004] The existing device has the following problems in the horizontal stretching process, the track cannot be adjusted, and it cannot be applied to the production of films of different widths, therefore, a two-way stretching device with adjustable horizontal stretching stroke and reliable clamping synchronization is needed to improve the film stretching quality and line adaptability. SUMMARY

[0005] To solve the above problems, the present application provides a two-way stretching device for film production, which comprises a longitudinal stretching device and a horizontal stretching device, the horizontal stretching device comprises an upper clamp and a lower clamp, the upper clamp and the lower clamp are installed on a rack, the upper clamp and the lower clamp each comprise a plurality of chain wheels, a driving bar is rotatably connected between the plurality of chain wheels, a plurality of stretching heads are fixedly connected to the driving bar, the stretching head comprises a mounting plate, a converter is fixedly connected to the side wall of the mounting plate, the converter comprises a middle plate, a base sleeve and a middle rod are fixedly connected to the side wall of the middle plate, a rotating sleeve is rotatably connected to one end of the base sleeve, the rotating sleeve is sleeved on the outside of the middle rod, a screw rod is arranged on one side of the rotating sleeve, a helical blade is fixedly connected to the outer wall of the screw rod, a silk sleeve is fixedly connected to one end of the screw rod, a lead screw is fixedly connected to one end of the middle rod, and the lead screw and the silk sleeve are threadedly connected.

[0006] A chuck is fixedly connected to the side wall of the mounting plate, the chuck comprises a bottom plate, two limit rods are fixedly connected to the side wall of the bottom plate, a left sliding rod and a right sliding rod are slidably connected between the two limit rods, an inner rod is fixedly connected to the side wall of the left sliding rod, a sliding sleeve is fixedly connected to the side wall of the right sliding rod, the sliding sleeve is sleeved on the outside of the inner rod, a top spring is installed between the inner rod and the sliding sleeve, one end of the left sliding rod and the right sliding rod is slidably connected with the helical blade, and the bottom end of the left sliding rod and the right sliding rod is fixedly connected with a left chuck and a right chuck respectively.

[0007] As a further improvement of the present application, the upper driving track and the lower driving track are fixedly connected to the rack, and the upper driving track and the lower driving track correspond to the upper clamp and the lower clamp respectively.

[0008] As a further improvement of the present application, the side wall of the mounting plate is fixedly connected with an adjusting device, the adjusting device comprises an upper plate, the side wall of the upper plate is fixedly connected with an adjusting frame, the inside of the adjusting frame is slidably connected with a sliding block, the side wall of the sliding block is rotatably connected with a rotating shaft, the top end of the adjusting frame is rotatably connected with a threaded rod, and the threaded rod penetrates through the sliding block and is threadedly connected therewith.

[0009] As a further improvement of the present application, one end of the rotating shaft is fixedly connected with a fixed disc, one end of the fixed disc is fixedly connected with a movable disc, one end of the movable disc is rotatably connected with a gear, and the gear and the rack are matched.

[0010] As a further improvement of the present application, the side wall of the upper plate is further fixedly connected with a tensioning wheel, the outer wall of the rotating shaft and the rotating sleeve is respectively fixedly connected with a driving wheel and a driven wheel, and the tensioning wheel, the driving wheel and the driven wheel are rotatably connected with a transmission belt.

[0011] As a further improvement of the present application, a plurality of folding rods are fixedly connected between one end of the rotating sleeve and one end of the silk sleeve.

[0012] A method for using a bidirectional stretching device for film production, characterized by comprising the following steps:

[0013] S1, the film is longitudinally stretched when passing through the longitudinal stretching device, and then is transferred to the transverse stretching device, and the film is transversely stretched when passing through the transverse stretching device, thereby completing the bidirectional stretching processing of the film;

[0014] S2, when the transverse stretching device works, the sprocket drives the driving bars to rotate, the rotating directions of the sprockets of the upper clamp and the lower clamp are opposite, the transmission directions of the driving bars of the upper clamp and the lower clamp are opposite, and the side between the driving bars of the upper clamp and the driving bars of the lower clamp which are close to each other is set as a stretching zone, and the side between the driving bars of the upper clamp and the driving bars of the lower clamp which are away from each other is set as a reset zone;

[0015] S3, when the film passes through the stretching zone, the plurality of stretching heads on the driving bars move to the positions of the stretching zone in sequence, the left clamping heads of the upper clamp and the lower clamp clamp one end of the film, and the right clamping heads of the plurality of upper clamps and the lower clamps clamp the other end of the film;

[0016] S4, when the stretching head passes through the stretching zone, the adjusting device drives the rotating sleeve to rotate, the rotating sleeve rotates to drive the screw rod to rotate positively through the folding rod, and the screw rod rotates positively to rotate to the left under the action of the silk sleeve and the screw rod in the process;

[0017] S5, when the screw rotates to the left, the pitch of the helical blade between the left slide bar and the right slide bar increases, and under the action of the top spring, the left slide bar and the right slide bar are pushed away from each other, so as to stretch the film in the transverse direction;

[0018] S6, similarly, when the stretching head passes through the reset area, the screw reverses, so that the left slide bar and the right slide bar approach each other until the initial distance between the left chuck and the right chuck is restored. The initial distance refers to the transverse width of the film before transverse stretching.

[0019] As a further improvement of the present application, the transmission step of the adjusting device is that the stretching head moves with the driving bar, the gear rotates when it engages with the rack, the rotating shaft rotates when the gear rotates, the rotating sleeve rotates through the transmission belt when the rotating shaft rotates, and the screw rotates through the folding rod when the rotating sleeve rotates.

[0020] As a further improvement of the present application, the gear can be set to different specifications, and the fixed disc and the movable disc are detachably connected.

[0021] In summary, by replacing the gear on the stretching head, the stretching length of the film can be changed to meet the production needs of films of different specifications, improving the diversified processing capacity of the film. When the gears on the multiple stretching heads are of the same specification, the stretching lengths of different parts of the film are consistent. When the gears on the multiple stretching heads are set to different specifications, the stretching widths of the films corresponding to the multiple stretching heads are different, so that different regions of the film have different stretching rates. This is suitable for film preparation processes that have specific design requirements for local thickness, stress distribution or surface structure, further improving the diversified processing capacity of the film. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the front view of the upper clamp and the lower clamp in the first and second embodiments of the present application;

[0023] Figure 2 is the side view of the upper clamp and the lower clamp in the first and second embodiments of the present application;

[0024] Figure 3 is the side view of the converter and the chuck in the first and second embodiments of the present application;

[0025] Figure 4 is the side view of the adjusting device in the first and second embodiments of the present application;

[0026] Figure 5 is the side view of the left slide bar and the right slide bar in the first and second embodiments of the present application;

[0027] Figure 6 is the side view of the rotating sleeve in the first and second embodiments of the present application;

[0028] Figure 7 The state diagram of the left slide rod and the right slide rod moving away from each other in the first and second embodiments of the application;

[0029] Figure 8 The connection structure diagram of the tension pulley, the driving pulley and the driven pulley in the first and second embodiments of the application;

[0030] Figure 9 The flow chart of the using method of the bidirectional stretching device in the second embodiment of the application;

[0031] Figure 10 The rotation direction diagram of the gear in the second embodiment of the application.

[0032] Explanation of the figure marks:

[0033] 1, sprocket; 101, driving bar; 2, mounting plate; 3, middle plate; 301, base sleeve; 302, middle rod; 303, rotating sleeve; 304, screw rod; 305, helical blade; 306, wire sleeve; 307, lead screw; 4, bottom plate; 401, limiting rod; 402, left slide rod; 403, right slide rod; 404, inner rod; 405, sliding sleeve; 406, top spring; 407, left chuck; 408, right chuck; 5, road frame; 501, rack; 6, upper plate; 601, adjusting frame; 602, sliding block; 603, rotating shaft; 604, fixed disc; 605, movable disc; 606, gear; 607, tension pulley; 608, driving pulley; 609, driven pulley; 610, transmission belt; 611, threaded rod; 7, folding rod. DETAILED DESCRIPTION

[0034] The two embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0035] First embodiment:

[0036] Figures 1-8The utility model discloses a bidirectional stretching device for film production, including longitudinal stretching device and lateral stretching device, and the lateral stretching device includes upper clamp and lower clamp, and upper clamp and lower clamp are installed on the frame, and upper clamp and lower clamp all include a plurality of chain wheels 1, and the rotatable connection of a plurality of chain wheels 1 has drive bar 101, and drive bar 101 is fixedly connected with a plurality of stretching heads, and the stretching head includes mounting plate 2, and the lateral wall of mounting plate 2 is fixedly connected with converter, and converter includes middle plate 3, and the lateral wall of middle plate 3 is fixedly connected with base sleeve 301 and middle rod 302, and one end of base sleeve 301 is rotatably connected with rotating sleeve 303, and rotating sleeve 303 is set on the outside of middle rod 302, and one side of rotating sleeve 303 is provided with screw rod 304, and the outer wall of screw rod 304 is fixedly connected with spiral blade 305, and one end of screw rod 304 is fixedly connected with silk sleeve 306, and one end of middle rod 302 is fixedly connected with lead screw 307, and lead screw 307 and silk sleeve 306 are threadedly connected;

[0037] The lateral wall of mounting plate 2 is fixedly connected with chuck, and the chuck includes bottom plate 4, and the lateral wall of bottom plate 4 is fixedly connected with two limit rods 401, and the sliding connection between two limit rods 401 has left slide rod 402 and right slide rod 403, and the lateral wall of left slide rod 402 is fixedly connected with inner rod 404, and the lateral wall of right slide rod 403 is fixedly connected with sliding sleeve 405, and sliding sleeve 405 is set on the outside of inner rod 404, and top spring 406 is installed between inner rod 404 and sliding sleeve 405, and one end of left slide rod 402 and right slide rod 403 is slidably connected with spiral blade 305, and the bottom end of left slide rod 402 and right slide rod 403 is fixedly connected with left chuck 407 and right chuck 408 respectively.

[0038] The upper drive track and the lower drive track are fixedly connected on the frame, and the upper drive track and the lower drive track correspond to the upper clamp and the lower clamp respectively, and the upper drive track and the lower drive track all include road frame 5, and the top end and the bottom end of road frame 5 are fixedly connected with rack 501.

[0039] The lateral wall of mounting plate 2 is fixedly connected with adjusting device, and the adjusting device includes upper plate 6, and the lateral wall of upper plate 6 is fixedly connected with adjusting frame 601, and the inside of adjusting frame 601 is slidably connected with sliding block 602, and the lateral wall of sliding block 602 is rotatably connected with rotating shaft 603, and the top end of adjusting frame 601 is rotatably connected with fixed threaded rod 611, and fixed threaded rod 611 penetrates sliding block 602 and is threadedly connected with sliding block 602, and one end of rotating shaft 603 is fixedly connected with fixed connecting disc 604, and one end of fixed connecting disc 604 is fixedly connected with movable connecting disc 605, and one end of movable connecting disc 605 is rotatably connected with gear 606, and gear 606 and rack 501 are matched, and the lateral wall of upper plate 6 is also fixedly connected with tension pulley 607, and the outer wall of rotating shaft 603 and rotating sleeve 303 is fixedly connected with driving wheel 608 and driven wheel 609 respectively, and the rotatable connection between tension pulley 607, driving wheel 608 and driven wheel 609 has transmission belt 610, and one end of rotating sleeve 303 and one end of silk sleeve 306 are fixedly connected with a plurality of folding rods 7.

[0040] The second embodiment is:

[0041] Figures 1-9 The use method of the bidirectional stretching device for film production is shown, which comprises the following steps:

[0042] S1, the film is longitudinally stretched when passing through the longitudinal stretching device, and then is transferred to the transverse stretching device, and the film is transversely stretched when passing through the transverse stretching device, so that the bidirectional stretching of the film is completed;

[0043] S2, when the transverse stretching device works, the sprocket 1 drives the driving strip 101 to rotate, the rotating directions of the sprocket 1 of the upper clamp and the sprocket 1 of the lower clamp are opposite, the transmission directions of the driving strip 101 of the upper clamp and the driving strip 101 of the lower clamp are opposite, and the side between the driving strip 101 of the upper clamp and the driving strip 101 of the lower clamp that are close to each other is set as a stretching zone, and the side between the driving strip 101 of the upper clamp and the driving strip 101 of the lower clamp that are far away from each other is set as a reset zone;

[0044] S3, when the film passes through the stretching zone, a plurality of stretching heads on the driving strip 101 move to the position of the stretching zone in sequence, the left chuck 407 of the upper clamp and the left chuck 407 of the lower clamp clamp one end of the film, and at the same time, the right chucks 408 of a plurality of upper clamps and the right chucks 408 of the lower clamps clamp the other end of the film;

[0045] S4, when the stretching head passes through the stretching zone, the adjusting device drives the rotating sleeve 303 to rotate, the rotating sleeve 303 rotates to drive the screw rod 304 to rotate in a positive direction through the folding rod 7, and the screw rod 304 rotates in the positive direction to rotate to the left under the action of the silk sleeve 306 and the screw rod 307;

[0046] S5, when the screw rod 304 rotates to the left, the pitch of the helical blade 305 between the left slide rod 402 and the right slide rod 403 increases, and under the action of the top spring 406, the left slide rod 402 and the right slide rod 403 are pushed away from each other, so that the film can be transversely stretched;

[0047] S6, similarly, when the stretching head passes through the reset zone, the screw rod 304 reversely rotates to make the left slide rod 402 and the right slide rod 403 close to each other, until the initial distance between the left chuck 407 and the right chuck 408 is restored, and the initial distance refers to the transverse width of the film before transverse stretching.

[0048] The transmission step of the adjusting device is that the stretching head moves with the driving strip 101, the gear 606 rotates when the gear 606 meshes with the rack 501, the rotating shaft 603 rotates when the gear 606 rotates, the rotating sleeve 303 rotates through the transmission belt 610 when the rotating shaft 603 rotates, and the screw rod 304 rotates through the folding rod 7 when the rotating sleeve 303 rotates, such as Figure 10As shown, when the gear 606 is engaged with the rack 501 of the stretching zone, the gear 606 rotates in the same direction as the screw rod 304, and when the gear 606 is engaged with the rack 501 of the reset zone, the gear 606 rotates in the opposite direction as the screw rod 304. Here, the terms "in the same direction" and "in the opposite direction" do not refer to a specific direction, but rather indicate the opposite rotation directions of the gear 606 in the stretching zone and the reset zone.

[0049] The gear 606 can be provided in different specifications, and the fixed disc 604 and the movable disc 605 are detachably connected. The movable disc 605 and the gear 606 are integrated. When replacing the gear 606, the movable disc 605 needs to be detached from the fixed disc 604 for replacement. After replacing the gear 606, the gear 606 cannot be engaged with the rack 501 due to the different specifications of the gear 606. Therefore, the threaded rod 611 needs to be rotated to drive the slider 602 to move up and down until the gear 606 can be engaged with the rack 501.

[0050] By changing the specifications of the gear 606, the number of rotations of the gear 606 can be different when the upper clamp and the lower clamp move the same distance. When the number of rotations of the gear 606 is small, the number of rotations of the screw rod 304 is small, and the distance between the left slide rod 402 and the right slide rod 403 is small, which means that the lateral stretching of the film is small. Conversely, the lateral stretching of the film is large. Through the above arrangement, by setting the gear 606 in different specifications, the lateral stretching distance of the film can be quickly adjusted, and the production requirements of different production lines can be met.

[0051] When the gears of the multiple stretching heads are of the same specification, the stretching lengths of different parts of the film are consistent, which is suitable for uniform stretching of the film. When the gears 606 of the multiple stretching heads are set in different specifications, the stretching widths of the films corresponding to the multiple stretching heads are different, which causes different stretching rates in different regions of the film. This structure is suitable for film preparation processes that have specific design requirements for local thickness, stress distribution, or surface structure. The introduction of this structure improves the flexibility of the control of the lateral stretching process and expands the adaptability of the device to various complex processes.

[0052] For example, a local thickness control type film process: In some functional film applications, such as battery separators, medical films, or sensing films, there are specific design requirements for the thickness of different regions of the film. By adjusting the specifications of the gears of different stretching heads, the stretching rate of some regions can be reduced (i.e., the stretching amount is small, and the thickness is relatively retained), while the stretching rate of other regions is high, thereby forming a local thickness transition structure to meet the functional requirements.

[0053] Stress gradient distribution film process: when there is residual stress in the film during the cooling or use stage, it often affects the dimensional stability or mechanical properties. Through differential control during transverse stretching, the stress distribution can be artificially designed to concentrate or release stress in specific areas to adapt to application scenarios that require precise control of stress, such as flexible electronic devices, composite interlayer films, etc.

[0054] Surface structure regulation film process: In some applications, certain structural changes need to be formed on the surface of the film, such as undulations, wrinkles, or indentation effects, to change the surface contact properties, optical properties, or flexibility. Through local differential deformation during transverse stretching, an indirect non-flat surface can be formed, which is suitable for the preparation of special functional films such as biomimetic membranes, breathable membranes, and smart response materials.

[0055] In combination with the current actual needs, the above-mentioned embodiments adopted by the present application are not limited to this, various changes within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. A biaxial stretching apparatus for film production, comprising a longitudinal stretching device and a transverse stretching device, characterized in that: The transverse stretching device includes an upper clamp and a lower clamp, both of which are mounted on a frame. Each clamp includes multiple sprockets (1), and a drive bar (101) is rotatably connected between the sprockets (1). Multiple stretching heads are fixedly connected to the drive bar (101). Each stretching head includes a mounting plate (2), and a converter is fixedly connected to the side wall of the mounting plate (2). The converter includes a middle plate (3), and a base sleeve (301) and a middle rod (302) are fixedly connected to the side wall of the middle plate (3). A rotating sleeve (303) is rotatably connected to one end of the base sleeve (301). The rotating sleeve (303) is sleeved on the outside of the middle rod (302). A screw (304) is provided on one side of the rotating sleeve (303). A spiral blade (305) is fixedly connected to the outer wall of the screw (304). A threaded sleeve (306) is fixedly connected to one end of the screw (304). A plurality of bent rods (7) are fixedly connected between one end of the rotating sleeve (303) and one end of the threaded sleeve (306). A screw (307) is fixedly connected to one end of the middle rod (302). The screw (307) and the threaded sleeve (306) are threadedly connected. An adjustment device is fixedly connected to the side wall of the mounting plate (2). The adjustment device drives the rotating sleeve (303) to rotate. The mounting plate (2) has a clamp fixedly connected to its side wall. The clamp includes a base plate (4). Two limiting rods (401) are fixedly connected to the side wall of the base plate (4). A left sliding rod (402) and a right sliding rod (403) are slidably connected between the two limiting rods (401). An inner rod (404) is fixedly connected to the side wall of the left sliding rod (402). A sliding sleeve (405) is fixedly connected to the side wall of the right sliding rod (403). The sliding sleeve (405) is fitted onto... A top spring (406) is installed on the outside of the inner rod (404) and between the inner rod (404) and the sliding sleeve (405). One end of the left sliding rod (402) and the right sliding rod (403) are slidably connected to the spiral plate (305). The pitch of the spiral plate (305) between the left sliding rod (402) and the right sliding rod (403) is increased. The bottom ends of the left sliding rod (402) and the right sliding rod (403) are respectively fixedly connected to the left chuck (407) and the right chuck (408).

2. The biaxial stretching apparatus for thin film production according to claim 1, characterized in that: The frame is fixedly connected to an upper drive rail and a lower drive rail, which correspond to an upper clamp and a lower clamp respectively. Both the upper drive rail and the lower drive rail include a road frame (5), and the top and bottom ends of the road frame (5) are fixedly connected to racks (501).

3. The biaxial stretching apparatus for thin film production according to claim 2, characterized in that: The adjusting device includes an upper plate (6), an adjusting frame (601) is fixedly connected to the side wall of the upper plate (6), a slider (602) is slidably connected inside the adjusting frame (601), a rotating shaft (603) is rotatably connected to the side wall of the slider (602), and a threaded rod (611) is rotatably connected to the top of the adjusting frame (601). The threaded rod (611) passes through the slider (602) and is threadedly connected to it.

4. The biaxial stretching apparatus for thin film production according to claim 3, characterized in that: One end of the rotating shaft (603) is fixedly connected to a fixed receiving plate (604), one end of the fixed receiving plate (604) is fixedly connected to a movable receiving plate (605), one end of the movable receiving plate (605) is rotatably connected to a gear (606), and the gear (606) matches the rack (501).

5. The biaxial stretching apparatus for thin film production according to claim 4, characterized in that: The side wall of the upper plate (6) is also fixedly connected to a tensioning wheel (607), and the outer walls of the rotating shaft (603) and the rotating sleeve (303) are respectively fixedly connected to a driving wheel (608) and a driven wheel (609). A transmission belt (610) is rotatably connected between the tensioning wheel (607), the driving wheel (608) and the driven wheel (609).

6. The method of using the biaxial stretching apparatus for film production according to claim 5, characterized in that: Includes the following steps: S1. When the film passes through the longitudinal stretching device, it is stretched longitudinally and then transferred to the transverse stretching device. When the film passes through the transverse stretching device, it is stretched transversely, thus completing the biaxial stretching process of the film. S2. When the transverse stretching device is working, the sprocket (1) drives the drive bar (101) to rotate, and the sprocket (1) of the upper clamp and the sprocket (1) of the lower clamp rotate in opposite directions. The drive bar (101) of the upper clamp and the drive bar (101) of the lower clamp are driven in opposite directions. The side between the drive bar (101) of the upper clamp and the drive bar (101) of the lower clamp that are close to each other is set as the stretching area, and the side between the drive bar (101) of the upper clamp and the drive bar (101) of the lower clamp that are far away from each other is set as the reset area. S3. When the film passes through the stretching zone and multiple stretching heads on the drive bar (101) move sequentially to the position of the stretching zone, the left clamp (407) of the upper clamp and the left clamp (407) of the lower clamp hold one end of the film, while the right clamp (408) of the upper clamp and the right clamp (408) of the lower clamp hold the other end of the film. S4. When the stretching head passes through the stretching zone, the adjusting device drives the rotating sleeve (303) to rotate. When the rotating sleeve (303) rotates, it drives the screw (304) to rotate in the forward direction through the bending rod (7). During the forward rotation of the screw (304), it rotates to the left under the action of the thread sleeve (306) and the thread rod (307). S5. When the screw (304) rotates to the left, the pitch of the spiral blade (305) between the left slide rod (402) and the right slide rod (403) increases. Under the action of the top spring (406), the left slide rod (402) and the right slide rod (403) are pushed away from each other, which can stretch the film laterally. S6. Similarly, when the stretching head passes through the reset zone, the screw (304) rotates in the opposite direction, causing the left slide bar (402) and the right slide bar (403) to move closer to each other until the left clamp (407) and the right clamp (408) return to their initial distance. The initial distance refers to the lateral width of the film before it is stretched laterally.

7. The method of using the biaxial stretching apparatus for film production according to claim 6, characterized in that: The transmission steps of the adjustment device are as follows: the stretching head moves with the drive bar (101), and the gear (606) rotates when the gear (606) meshes with the rack (501). When the gear (606) rotates, it drives the rotating shaft (603) to rotate. When the rotating shaft (603) rotates, it drives the rotating sleeve (303) to rotate through the transmission belt (610). When the rotating sleeve (303) rotates, it drives the screw (304) to rotate through the folding rod (7).

8. The method of using the biaxial stretching apparatus for film production according to claim 7, characterized in that: The gear (606) can be configured in different specifications, and the fixed plate (604) and the movable plate (605) are detachably connected.

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