A fully automatic PTFE film stretching and sintering machine and stretching and sintering method

Abstract

The present invention discloses a fully automatic PTFE film stretching and sintering machine and a stretching and sintering method, which relate to the technical field of PTFE film stretching and sintering machines, comprising: a sintering and heating chamber, a conveying member, and a film to be stretched, wherein the conveying member is symmetrically arranged in the inner cavity of the sintering and heating chamber, and the film to be stretched is located in the middle of the conveying member. The present invention also comprises: a first component, a second component, and a third component, wherein the first component and the second component are located on the same vertical plane. The present invention, through the design of a stabilizing tube and a push piece, can not only complete the solution conveying work when the first component and the second component are working, but also indirectly monitor whether the conveying device and the stretching device are uneven and thus cause the problem of uneven force on the film through the movement of the push piece in the stabilizing tube; the design of multiple functions of the above-mentioned set of components significantly reduces the complex maintenance work and cost caused by the increase in components; improves the overall operation efficiency of the equipment, and ensures the continuity of production.

Description

Technical Field

[0001] The invention relates to the technical field of PTFE film stretching and sintering machines, in particular to a fully automatic PTEE film stretching and sintering machine and a stretching and sintering method. Background Art

[0002] PTFE film is widely used in modern industrial production, and its quality and performance largely depend on the key process of stretching and sintering. The fully automatic PTFE film stretching and sintering machine and the corresponding stretching and sintering method play a vital role in improving production efficiency and ensuring product quality.

[0003] However, many problems still exist in the existing stretching and sintering production process of PTFE films. For example, if there is misalignment between the stretching rollers of the film rolling machine, the film will be subjected to uneven force during the stretching stage. The uneven stretching force will destroy the regular arrangement of the PTFE molecular chains. The PTFE molecular chains should be arranged in an orderly manner along the stretching direction during the stretching process to improve the strength and toughness of the film. However, due to the uneven stretching caused by the misalignment of the ball body, the molecular chain arrangement becomes chaotic, resulting in a decrease in the physical properties of the film. For example, the tensile strength of the film will be reduced, making it more prone to cracking during use. The chemical corrosion resistance will also be affected, making it more susceptible to corrosion when exposed to chemicals, thereby shortening the service life of the film.

[0004] At the same time, this uneven state will further cause serious consequences in subsequent processing, especially in a hot and humid production environment; due to uneven stretching, the stress distribution inside the film is unbalanced, and bubbles are easily formed inside the material. During stretching and sintering, stress concentration will occur around these bubbles, and the tensile force will cause holes to appear in the film. Once the film has holes, there will be a lot of problems both in the stretching and sintering production process and in the final product use stage. For example, in the sintering stage, the holes will cause uneven heat transfer, affecting the crystallization and molecular rearrangement effects, and will also allow external gas impurities to enter and react with PTFE, causing the film to discolor and become brittle. In terms of product use, the strength of the film is reduced due to the holes, and it is easy to break as a packaging material and cannot protect the product. When used in sealing scenarios, the sealing is poor, and gas and liquid are easy to leak, contaminating or damaging the packaged items. In terms of corrosion resistance, the holes destroy the surface integrity, making the film more susceptible to corrosion when it comes into contact with corrosive media. In optical applications, the holes change the light propagation characteristics, reduce light transmittance, and blur the image. In electrical applications, they will change electrical parameters, interfere with signal transmission or cause safety hazards such as leakage. These problems have seriously affected the production quality and performance of PTFE films and need to be solved urgently.

[0005] Therefore, the present invention proposes a fully automatic PTFE film stretching and sintering machine and a stretching and sintering method to solve the above problems. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to propose a fully automatic PTFE film stretching and sintering machine and a stretching and sintering method to solve the problems existing in the prior art.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a fully automatic PTFE film stretching and sintering machine, comprising: a sintering and heating chamber, a conveying member, and a film to be stretched, wherein the conveying member is symmetrically arranged in the inner cavity of the sintering and heating chamber, and the film to be stretched is located in the middle of the conveying member; the machine also comprises: a first component, a second component, and a third component, wherein the first component and the second component are located on the same vertical plane, and the third component is located on one side of the first component;

[0008] The first component is used to adjust the thickness uniformity of the film to be stretched, ensuring uniform tensile stress to obtain a non-damaged and tear-resistant PTFE film;

[0009] The second component is used to assist in eliminating bubbles in a hot and humid environment of the film to be stretched when the first component adjusts the thickness uniformity of the film to be stretched;

[0010] The third component is used to detect the position of the device to ensure that the position of the device is aligned with the film to be stretched transported by the conveyor, thereby providing a guarantee for the normal operation of the first component and the second component.

[0011] Preferably, the first component includes a main body frame arranged in the inner cavity of the sintering and heating chamber, a screw is rotatably connected to the main body frame, a transverse groove for sliding of the follower is opened on the top wall of the inner cavity of the main body frame, a follower is threadedly connected to the screw, and the follower slides transversely in the transverse groove opened on the top wall of the inner cavity of the main body frame.

[0012] Preferably, a slide groove is provided at the bottom of the follower, and the follower is slidably connected to a connecting column A through the bottom slide groove. The bottom of the connecting column A is rotatably connected to a connecting column B. The bottom of the connecting column B is fixedly connected to a main swing shell, and the inner cavity of the main swing shell is slidably connected to a secondary swing shell. An ironing plate is fixedly connected to the bottom surface of the inner cavity of the sintering and heating chamber below the main frame.

[0013] Preferably, the second component includes a serpentine groove opened on the main frame, a guide piece is slidably connected in the serpentine groove, and the guide piece is fixedly connected to the connecting column B.

[0014] Preferably, the top wall of the inner cavity of the main swing shell is fixedly connected to a hollow cover shell, the inner cavity surface of the auxiliary swing shell is fixedly connected to a docking column cavity component, the inner cavity of the docking column cavity component is fixedly connected to a return spring A, and the top of the return spring A is fixedly connected to the hollow cover shell.

[0015] Preferably, sliding grooves are symmetrically provided on the inner wall of the main swing shell, and limiting blocks are fixedly connected to the tops of both side walls of the auxiliary swing shell.

[0016] Preferably, the third component includes a support block fixedly connected to the inner cavity of the sintering and heating chamber, the support block is fixedly connected to a stabilizing tube, a reset spring B is fixedly connected in the stabilizing tube, and one end of the reset spring B is fixedly connected to a push piece.

[0017] Preferably, a Hall switch card is provided on the stabilizing tube, the inner end of the stabilizing tube is fixedly connected to a water pipe, the end of the water pipe away from the stabilizing tube is fixedly connected to the main swing shell, and the upper surface of the main frame is fixedly connected to a water pump tank.

[0018] The fully automatic PTFE film stretching and sintering method includes the following steps: raw material preparation, stretching and elongation operation, sintering pretreatment, sintering treatment, cooling, and quality inspection;

[0019] The raw material preparation includes: selecting PTFE resin material, checking its purity and original physical state to ensure that there are no obvious defects; heating and mixing the PTFE material;

[0020] The stretching and extending operation: the mixed PTFE resin is passed through a film degreasing, recycling and stretching machine to be initially stretched into a strip shape, and then the PTFE strip is initially processed into a PTFE tape, and then the PTFE tape is stretched again through an automatic laminating machine to form a preliminary PTFE film;

[0021] The sintering pretreatment process is mainly used to readjust the thickness uniformity of the to-be-stretched film with uneven thickness before sintering through the cooperation of the auxiliary swing shell at the bottom of the main swing shell and the ironing plate, and the auxiliary swing shell on the main swing shell is swung with the assistance of the serpentine groove to assist in the thickness uniformity readjustment while eliminating bubbles in the to-be-stretched film in a humid and hot environment. At the same time, the straightness of the stabilizing tube is indirectly detected and fed back by sliding the push piece back and forth in the stabilizing tube to avoid the situation where the skewness of the conveying affects the stability of the subsequent stretching process;

[0022] The sintering process includes: after pretreatment, the PTFE material is fed into a sintering area and the temperature is raised to the sintering temperature, which is generally between 383°C and 400°C; the sintering time is determined based on the thickness of the PTFE material and the required film properties; during the sintering process, the temperature is maintained stable. A special heating structure and temperature feedback control system are used to ensure that the temperature fluctuation in the entire sintering area is within the process requirements, so that the PTFE material is fully sintered at high temperature and the molecular structure is stabilized and optimized;

[0023] The cooling includes: after sintering is completed, starting the cooling system, using air cooling or water cooling to quickly cool the PTFE film to a process cooling temperature range through an air cooling or water cooling process, and the cooling speed should be moderate to avoid stress inside the film due to excessive cooling or affecting production efficiency due to excessive cooling;

[0024] The quality inspection includes: quality inspection of the PTFE film after stretching and sintering, and the inspection items include the film's thickness, thickness uniformity, tensile strength, elongation at break, air permeability, corrosion resistance and other physical and chemical performance indicators; using measuring instruments and professional testing equipment to ensure that the film's performance indicators meet relevant product standards and application requirements.

[0025] Compared with the prior art, the present invention provides a fully automatic PTFE film stretching and sintering machine, which has the following beneficial effects:

[0026] 1. The present invention utilizes a design in which the main swing housing and the auxiliary swing housing are buckled together to form a solution chamber with adjustable size. Combined with the ironing board supporting the film to be stretched, the combined chamber can be filled with water during the conveyance of the film to be stretched on its uneven surface, thereby achieving downward pressure on the film with varying weights, thereby uniforming its overall thickness. This design, which allows for adjustment of the downward pressure weight according to thickness, provides the following advantages for the overall operation:

[0027] Improved thickness uniformity: During the production process, this component can ensure uniform thickness of the film being conveyed for stretching, effectively avoiding problems that may arise during the stretching and sintering process due to uneven thickness of the film roll. A film with uniform thickness ensures uniform tension in all parts, avoiding stress concentration caused by localized excessive thinness or thickness, which could lead to localized excessive stretching and rupture, thereby improving the integrity and quality of the film.

[0028] Improved physical properties: During subsequent use, the uniform stress during stretching and sintering ensures a more ordered and uniform molecular arrangement in the film, which helps improve the film's strength, toughness, and other physical properties, enabling it to better withstand external forces during use. For example, in electronics applications, the film's enhanced mechanical stability can better protect electronic components from external physical impacts.

[0029] 2. In the present invention, based on the main swing shell and the auxiliary swing shell moving back and forth on the film to be stretched to perform thickness uniformity processing, a serpentine groove and a guide plate design are added, which can effectively transform the auxiliary swing shell from the original linear motion to a swinging forward mode based on the linear movement when the auxiliary swing shell moves on the film to be stretched. The above transformation can effectively solve a series of problems caused by the uneven stretching of the film and the generation of bubbles; specifically, for the stretching and sintering link, this swinging processing action can avoid the existence of bubbles and effectively avoid the problem of holes caused during stretching and sintering, thereby ensuring uniform heat transfer, making the crystallization and molecular rearrangement effects good, preventing external gas impurities from entering and reacting with PTFE, avoiding discoloration, brittleness and other quality deterioration phenomena of the film, and improving the stability of the finished product when used in different fields; for example, in terms of product use, since the holes are eliminated, the strength of the film can be maintained, and it can effectively protect the product as a packaging material; in the sealing scenario, the sealing is good to prevent gas and liquid leakage, and avoid contamination or damage to the packaged items; in terms of corrosion resistance, the surface integrity of the film is maintained, and the probability of corrosion when the film contacts corrosive media is reduced.

[0030] 3. In the present invention, on the basis of the main swing shell carrying the auxiliary swing shell to move back and forth on the film to be stretched to perform thickness uniformity processing, a serpentine groove and a guide plate design are added, which can effectively transform the auxiliary swing shell from the original linear motion to a swinging forward mode based on the linear movement when the auxiliary swing shell moves on the film to be stretched. The above-mentioned swinging action can perform airflow disturbance action in the sintering and heating chamber. This disturbance can improve the temperature uniformity in the inner cavity of the sintering and heating chamber, thereby significantly improving the uniformity of the thickness, stress distribution and molecular orientation of the film to be stretched during stretching, comprehensively improving product quality, reducing product defects, and further improving the perfection of the stretching and sintering work of the film to be stretched.

[0031] 4. The present invention can detect the skewness of the film to be stretched during the transportation process through the design of the third component, and promptly discover and avoid the problem of uneven force on the film caused by the unevenness of the conveying device and the stretching device; specifically, the straightness of the stabilizing tube can be judged by whether the push piece can move smoothly in the stabilizing tube, thereby indirectly monitoring the condition of the film to be stretched in the process from the conveying area to the stretching area, avoiding the skewness in the process, and ensuring that the film to be stretched is in the correct position and posture when entering the stretching area, avoiding local deformation incoordination and material accumulation, thereby reducing the problem of uneven heat transfer caused by wrinkles; at the same time, it also greatly reduces the stress concentration caused by uneven force and wrinkles, reduces the possibility of film rupture at high temperature, ensures the integrity of the film, and meets the requirements of high-quality applications.

[0032] 5. Through the design of the stabilizing tube and the push piece, the present invention can not only complete the solution transportation work when the first component and the second component are working, but also indirectly monitor whether the transportation device and the stretching device are uneven and cause uneven force on the film through the movement of the push piece in the stabilizing tube; the design of multiple functions of the above-mentioned set of components significantly reduces the complex maintenance work and costs caused by the increase in components; reduces the large number of parts inspection links involved in troubleshooting, shortens maintenance time, improves the overall operating efficiency of the equipment, greatly reduces the number of shutdowns in the production process, and ensures the continuity of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a half-cut structural diagram of the sintering and heating chamber in the present invention;

[0034] Figure 2 This is a full cross-sectional structural diagram of the sintering and heating chamber in the present invention;

[0035] Figure 3 For the present invention Figure 2 A magnified view of the structure at center A;

[0036] Figure 4 A bottom view of the main frame of the present invention;

[0037] Figure 5 A top view of the main frame of the present invention;

[0038] Figure 6 For the present invention Figure 5 A magnified view of the structure at point B in the middle;

[0039] Figure 7 This is a structural diagram of the first component, the second component, and the third component after the main frame of the present invention is cut away;

[0040] Figure 8 For the present invention Figure 7 A magnified view of the structure at point C in the middle;

[0041] Figure 9 This is a diagram showing the structure of the connecting column A, connecting column B, guide piece, main swing housing, and auxiliary swing housing in the present invention;

[0042] Figure 10 This is the appearance diagram of the present invention.

[0043] In the picture:

[0044] 1. Sintering and heating chamber; 2. Conveying parts; 3. Film to be stretched;

[0045] 4. First assembly; 401. Main frame; 402. Screw; 403. Follower; 404. Connecting column A; 405. Connecting column B; 406. Main swing housing; 407. Secondary swing housing; 408. Ironing board;

[0046] 5. Second component; 501. Serpentine groove; 502. Guide plate; 503. Hollow cover; 504. Docking column cavity; 505. Return spring A;

[0047] 6. The third component; 601. Support block; 602. Stabilizing tube; 603. Return spring B; 604. Push piece; 605. Hall switch card; 606. Water pipe; 607. Water pump tank. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0050] Example

[0051] Please refer to Figures 1 to 4 、 Figure 9 Figure 10 As shown:

[0052] To solve the problems mentioned in the technical solution, the embodiment of the present application provides a fully automatic PTFE film stretching and sintering machine, comprising: a sintering and heating chamber 1, a conveying member 2, and a film to be stretched 3, wherein the conveying member 2 is symmetrically arranged in the inner cavity of the sintering and heating chamber 1, and the film to be stretched 3 is located in the middle of the conveying member 2. The machine also includes: a first component 4, a second component 5, and a third component 6, wherein the first component 4 and the second component 5 are located on the same vertical plane, and the third component 6 is located on one side of the first component 4;

[0053] The first component 4 is used to adjust the thickness uniformity of the film to be stretched 3 to ensure uniform tensile stress so as to obtain a PTFE film without damage or tearing; the first component 4 includes a main frame 401 arranged in the inner cavity of the sintering and heating chamber 1, and a screw 402 is rotatably connected to the main frame 401. The top wall of the inner cavity of the main frame 401 is provided with a transverse groove for the sliding of a follower 403. The screw 402 is threadedly connected to the follower 403, and the follower 403 slides transversely in the transverse groove provided on the top wall of the inner cavity of the main frame 401. A sliding groove is provided at the bottom of the follower 403, and the follower 403 is slidably connected to a connecting column A404 through the bottom sliding groove. The bottom of the connecting column A404 is rotatably connected to a connecting column B405, and the bottom of the connecting column B405 is fixedly connected to a main swing shell 406, and the inner cavity of the main swing shell 406 is slidably connected to a secondary swing shell 407. An ironing plate 408 is fixedly connected to the bottom surface of the inner cavity of the sintering and heating chamber 1 below the main frame 401.

[0054] in:

[0055] The sintering and heating chamber 1 is equipped with conventional heating equipment for stretching and sintering the film to be stretched 3. It also includes conventional unidirectional light sources, such as a helium-neon laser, and a photosensitive device, a CCD image sensor. These are primarily used to illuminate the film to be stretched 3 and analyze its thickness through reflected light. A master controller controls the amount of water injected into the water storage tank formed by the hollow bodies of the main swing housing 406 and the auxiliary swing housing 407, thereby varying the crushing weight.

[0056] The film to be stretched 3 is obtained by processing with corresponding pre-processing equipment such as an olive film machine.

[0057] The first component 4 is used to adjust the thickness uniformity of the film to be stretched 3 to ensure uniform tensile stress so as to obtain a PTFE film without damage or tearing.

[0058] A transverse groove for the follower 403 to slide is formed on the top wall of the inner cavity of the main frame 401 .

[0059] The screw 402 is driven by a motor, and the driven member 403 is adapted to the screw 402 .

[0060] Both the connecting column A404 and the connecting column B405 are hollow structures. Water is provided on both sides of the connecting column A404. Specifically, the water on the left is used to push it to move, and the water on the right is used to be injected into the water tank composed of the hollow body of the main swing shell 406 and the auxiliary swing shell 407.

[0061] The hollow bodies of the main swing shell 406 and the auxiliary swing shell 407 can form a water storage tank. When the main swing shell 406 swings with the auxiliary swing shell 407, different thickness positions of the stretch film 3 can be processed under the action of different water volumes.

[0062] Further examples: Please refer to Figures 3 to 5 , Figures 7 to 9 As shown:

[0063] The second component 5 is used to assist in the bubble elimination process of the film to be stretched 3 in a humid and hot environment when the first component 4 adjusts the thickness uniformity of the film to be stretched 3; the second component 5 includes a serpentine groove 501 opened on the main frame 401, and a guide piece 502 is slidably connected in the serpentine groove 501, and the guide piece 502 is fixedly connected to the connecting column B405. The top wall of the inner cavity of the main swing shell 406 is fixedly connected to the hollow cover shell 503, and the inner cavity surface of the auxiliary swing shell 407 is fixedly connected to the docking column cavity part 504, and the inner cavity of the docking column cavity part 504 is fixedly connected to the return spring A505, and the top of the return spring A505 is fixedly connected to the hollow cover shell 503. The inner cavity wall of the main swing shell 406 is symmetrically provided with sliding grooves, and the tops of the two side walls of the auxiliary swing shell 407 are fixedly connected with limiting blocks.

[0064] in:

[0065] The second component 5 is used to assist in the bubble elimination process of the film 3 to be stretched in a hot and humid environment when the first component 4 adjusts the thickness uniformity of the film 3 to be stretched.

[0066] The guide piece 502 is adapted to the serpentine groove 501. The guide piece 502 moving in the serpentine groove 501 can indirectly carry the fixedly connected main swing shell 406 through the connecting column B405 and carry the main swing shell 406 to swing as it moves in the serpentine groove 501.

[0067] The reset spring A505 is mainly used to reset the relative position of the hollow cover 503 and the docking column cavity 504.

[0068] The limiting block cooperates with the sliding groove to prevent excessive water from being injected into the water storage tank formed by the hollow body of the main swing shell 406 and the auxiliary swing shell 407.

[0069] Further examples: Please refer to Figure 2 、 Figure 3 、 Figure 6 As shown:

[0070] The third component 6 is used to detect the position of the device to ensure that the position of the device is aligned with the film to be stretched 3 transported by the conveyor 2, and to provide guarantee for the normal operation of the first component 4 and the second component 5. The third component 6 includes a support block 601 fixedly connected to the inner cavity of the sintering and heating chamber 1, and a stabilizing tube 602 is fixedly connected to the support block 601, and a reset spring B603 is fixedly connected to the stabilizing tube 602. One end of the reset spring B603 is fixedly connected to a push piece 604, and a Hall switch card 605 is clamped on the stabilizing tube 602. The inner end of the stabilizing tube 602 is fixedly connected to a water pipe 606, and the end of the water pipe 606 away from the stabilizing tube 602 is fixedly connected to the main swing shell 406. The upper surface of the main frame 401 is fixedly connected to a water pump tank 607.

[0071] in:

[0072] The third component 6 is used to detect the position of the device to ensure that the device position is aligned with the film to be stretched 3 conveyed by the conveyor 2, thereby ensuring the normal operation of the first component 4 and the second component 5.

[0073] A connecting pipe is provided on the support block 601 , and the connecting pipe is connected with the inner cavity of the support block 601 and the inner cavity of the stabilizing tube 602 .

[0074] The stabilizing tube 602 is matched with the push piece 604 .

[0075] The reset spring B603 is mainly used for resetting the push piece 604.

[0076] The push piece 604 is made of magnetic material, and can be specifically implemented as a magnet.

[0077] The Hall switch card 605 is primarily used in conjunction with the push piece 604. There is an electrical connection between the Hall switch card 605 and the device's master controller. When the Hall switch card 605 and the push piece 604 are on the same vertical plane, it indicates that the stabilizing tube 602 is in a normal state and has not deformed due to long-term use, causing the entire connected device to become skewed and mismatched with the film 3 to be stretched being conveyed by the conveyor 2, resulting in torsional accumulation of the film 3 to be stretched, and thus passive tearing.

[0078] The water pump tank 607 is connected to the connecting pipe provided on the support block 601 through an auxiliary pipe, so as to transport the solution into the stabilizing pipe 602.

[0079] It should be noted that the first component 4, the second component 5, and the third component 6 cooperate with each other to improve the usability of other components based on their own functions.

[0080] Further examples:

[0081] The fully automatic PTFE film stretching and sintering method includes the following steps: raw material preparation, stretching and elongation operation, sintering pretreatment, sintering treatment, cooling, and quality inspection;

[0082] Raw material preparation includes: selecting PTFE resin materials, checking their purity and original physical state to ensure there are no obvious defects; heating and mixing the PTFE materials;

[0083] Stretching and extension operation: The mixed PTFE resin is passed through a film degreasing, recycling and stretching machine, and initially stretched into a strip shape, and initially processed into a PTFE tape. The PTFE tape is then stretched again through an automatic laminating machine to form a preliminary PTFE film.

[0084] Sintering pretreatment: This process is mainly used to readjust the thickness uniformity of the to-be-stretched film 3 with uneven thickness before sintering through the cooperation of the auxiliary swing shell 407 at the bottom of the main swing shell 406 and the ironing plate 408, and to swing the auxiliary swing shell 407 on the main swing shell 406 with the assistance of the serpentine groove 501. While assisting in the thickness uniformity readjustment, it also eliminates bubbles in the to-be-stretched film 3 in a hot and humid environment. At the same time, the push piece 604 slides back and forth in the stabilizing tube 602 to indirectly detect and feedback the straightness of the stabilizing tube 602, so as to avoid the situation where the skewness of the conveying affects the stability of the subsequent stretching process;

[0085] The sintering process includes: After pretreatment, the PTFE material is fed into the sintering area and the temperature is raised to the sintering temperature, which is usually between 383°C and 400°C. The sintering time is determined based on the thickness of the PTFE material and the required film properties. During the sintering process, the temperature is maintained stable. Through a special heating structure and temperature feedback control system, the temperature fluctuation in the entire sintering area is ensured to be within the process requirements, so that the PTFE material is fully sintered at high temperature and the molecular structure is stabilized and optimized.

[0086] Cooling includes: after sintering is completed, start the cooling system, use air cooling or water cooling to quickly cool the PTFE film to the process cooling temperature range through air cooling or water cooling. The cooling speed should be moderate to avoid stress inside the film due to too fast cooling or affecting production efficiency due to too slow cooling;

[0087] Quality inspection includes: quality inspection of PTFE film after stretching and sintering. Inspection items include film thickness, thickness uniformity, tensile strength, elongation at break, air permeability, corrosion resistance and other physical and chemical performance indicators; using measuring instruments and professional testing equipment to ensure that the performance indicators of the film meet the relevant product standards and application requirements.

[0088] Everything in the above example works as follows:

[0089] The following is the working process of the first component 4:

[0090] When in use, the screw 402 in the first component 4 will rotate under the drive, and the rotating screw 402 will lead the follower 403 thereon to move laterally under the action of the transverse groove provided on the main frame 401. When the follower 403 moves laterally, the follower 403 will lead the main swing housing 406 below the connecting column B405 and the sub-swing housing 407 slidably connected to the main swing housing 406 to move through the connecting column A404 slidably connected at the bottom. Further, when the main swing housing 406 leads the sub-swing housing 407 to move, the sub-swing housing 407 will cooperate with the ironing board 408 below to perform swing-type ironing and rolling work on the to-be-stretched film 3 being transported by the conveying member 2 therebetween.

[0091] Please refer to the above working process Figures 1 to 4 、 Figure 9 Figure 10 .

[0092] The following is the working process of the second component 5:

[0093] More specifically, when the follower 403 brings the lower connecting column A404 and the connecting column B405 to perform a linear reciprocating motion in the main frame 401, since the main frame 401 is provided with a serpentine groove 501, the guide piece 502 on the connecting column B405 is slidably connected to the serpentine groove 501. Therefore, during this reciprocating motion, the main swing housing 406 brings the auxiliary swing housing 407 to perform a swinging reciprocating motion with the assistance of the serpentine groove 501 and the guide piece 502. This operation can further increase the contact area of the sliding connection in the main swing housing 406 acting on the film 3 to be stretched, thereby improving the ironing and rolling effect.

[0094] Furthermore, by buckling the main swing shell 406 and the auxiliary swing shell 407 together to form a solution tank with adjustable size, and in combination with the ironing board 408 to support the film 3 to be stretched, the combined tank can be filled with water during the transportation of the film 3 to adjust its uneven thickness to achieve the downward pressure on the film 3 to be stretched with different weights, thereby uniforming its overall thickness. This design of adjusting the downward pressure according to different thicknesses can bring the following advantages to the overall work:

[0095] Improved thickness uniformity: During the production process, this component can process the thickness uniformity of the film to be stretched 3, effectively avoiding problems caused by uneven thickness of the film roll during the stretching and sintering process. A film with uniform thickness can ensure that all parts are subjected to uniform tension, avoiding stress concentration caused by local excessive thinness or thickness, which can lead to local over-stretching and rupture, thereby improving the integrity and quality of the film.

[0096] Improved physical properties: During subsequent use, the molecular arrangement of the film becomes more orderly and uniform due to the uniform stress during stretching and sintering, which helps to improve the film's physical properties such as strength and toughness, enabling it to better withstand external forces during use; for example, the film used in the electronics field has enhanced mechanical stability and can better protect electronic components from external physical impacts.

[0097] Furthermore, on the basis of the main swing shell 406 and the auxiliary swing shell 407 moving back and forth on the film to be stretched 3 to perform thickness uniformity processing, the design of the serpentine groove 501 and the guide piece 502 is added, which can effectively transform the auxiliary swing shell 407 from the original linear motion to a swinging forward mode based on the linear motion when the auxiliary swing shell 407 moves on the film to be stretched 3. The above transformation can effectively solve a series of problems caused by bubbles generated by uneven stretching of the film; specifically, for the stretching and sintering link, this swinging processing action can avoid the existence of bubbles and effectively avoid the occurrence of bubbles during stretching. The hole problem caused during sintering is eliminated, thereby ensuring uniform heat transfer, achieving good crystallization and molecular rearrangement effects, preventing external gas impurities from entering and reacting with PTFE, avoiding discoloration, brittleness and other quality deterioration phenomena in the film, and improving the stability of the finished product when used in different fields; for example, in terms of product use, since the holes are eliminated, the strength of the film is maintained, and it can effectively protect the product as a packaging material; in the sealing scenario, the sealing is good to prevent gas and liquid leakage, and avoid contamination or damage to the packaged items; in terms of corrosion resistance, the surface integrity of the film is maintained, reducing the probability of corrosion when the film contacts corrosive media.

[0098] Furthermore, on the basis of the main swing shell 406 carrying the auxiliary swing shell 407 to move back and forth on the film to be stretched 3 to perform thickness uniformity processing, the design of the serpentine groove 501 and the guide plate 502 is added, which can effectively transform the auxiliary swing shell 407 from the original linear motion to a swinging forward mode based on linear movement when the auxiliary swing shell 407 moves on the film to be stretched 3. The above-mentioned swinging action can perform airflow disturbance action in the sintering and heating chamber 1. This disturbance can improve the uniformity of the temperature in the inner cavity of the sintering and heating chamber 1, thereby significantly improving the uniformity of the thickness, stress distribution and molecular orientation of the film to be stretched 3 during stretching, comprehensively improving product quality, reducing product defects, and further improving the perfection of the stretching and sintering work of the film to be stretched 3.

[0099] Please refer to the above working process Figures 3 to 5 , Figures 7 to 9 .

[0100] The following is the working process of the third component 6:

[0101] More specifically, since it is known that the sintering heating chamber 1 is provided with not only the heating equipment for stretching and sintering the to-be-stretched film 3 in the prior art, but also the unidirectional light source in the prior art, which is implemented as a helium-neon laser, and the photosensitive device, which is implemented as a CCD image sensor, the two can be used to analyze the thickness of the to-be-stretched film 3 by reflecting light after irradiating it, and the total controller controls the amount of water injected into the water storage tank composed of the cavity of the main swing shell 406 and the auxiliary swing shell 407, so as to change the crushing weight; when in use, if it is detected that the thickness of the local to-be-stretched film 3 is thicker than that of other parts, the water pump tank 607 will pump the aqueous solution into the support block 601 through the pump under the action of the auxiliary pipe. Furthermore, since it is known that the support block 601 and the stabilizing tube 60 2 is connected, so at this time the push piece 604 in the stabilizing tube 602 will move to the right when the aqueous solution enters, and the return spring B603 is stretched. Furthermore, since it is known that the aqueous solution is also provided on the right side of the push piece 604, the push piece 604 will push the aqueous solution on its right side through the water delivery pipe 606 connected to one end of the stabilizing tube 602 to flow into the hollow connecting column A404 and the connecting column B405, and finally enter the water storage tank composed of the water delivery pipe 606 and the water pump tank 607, thereby providing corresponding weight for the auxiliary swing shell 407 to iron and roll the film 3 to be stretched that is transported to the bottom, so that the thickness uniformity treatment of the film 3 to be stretched is more perfect; at the same time, when the water pump tank 607 is performing thickness treatment on the film 3 to be stretched, it can also eliminate the bulging bubbles on the film 3 to be stretched;

[0102] Furthermore, in the above operation, in addition to effectively measuring the thickness of the film to be stretched 3 conveyed by the conveyor 2 and processing bubbles on the film to be stretched 3 due to the hot and humid temperature, the addition of a Hall switch card 605 and a magnetic push piece 604 on the stabilizing tube 602 can effectively monitor the straightness of the stabilizing tube 602 of the fixing device, thereby ensuring the linear motion of the film to be stretched 3 conveyed by the conveyor 2 at both sides of the designed device, i.e., the left conveying area and the right stretching and sintering area;

[0103] Specific description: as attached Figure 1As shown, if the stabilizing tube 602 is deformed due to long-term use or temperature factors, the designed device will be tilted relative to the transported film 3 to be stretched. At this time, the film 3 to be stretched transported by the conveying member 2 will be skewed or wrinkled, affecting the stretching work. Therefore, the straightness detection of the stabilizing tube 602 is a necessary supplementary measure to maintain the operation of the entire equipment and the implementation of its functions. Specifically, the push piece 604 can be moved in the stabilizing tube 602 by regularly pumping aqueous solution into the stabilizing tube 602. If the push piece 604 can move When the Hall switch card 605 provided at the tail of the stabilizing tube 602 is positioned and is on the same vertical plane with the Hall switch, the Hall switch in the Hall switch card 605 electrically connected to the main controller of the device will operate under the magnetic effect of the push piece 604. At this time, it means that the stabilizing tube 602 is in a normal state and has not been deformed due to long-term use of the device, so as to cause the entire connected device to be skewed. At this time, the device matches the film 3 to be stretched that is conveyed by the conveying member 2, and the film 3 to be stretched will not be twisted or piled up during transportation, thereby causing passive tearing.

[0104] Furthermore, through the design of the stabilizing tube 602 and the push piece 604, in addition to being able to excellently complete the solution delivery work when the first component 4 and the second component 5 are working, it is also possible to indirectly monitor whether the delivery device and the stretching device are unevenly aligned and cause uneven force on the film through the movement of the push piece 604 in the stabilizing tube 602; the above-mentioned design of a set of components with multiple functions can effectively reduce the addition of components, thereby significantly reducing the complex maintenance work and costs caused by the increase in components; reducing the large number of parts inspection links involved in troubleshooting, shortening maintenance time, improving the overall operating efficiency of the equipment, and greatly reducing the number of shutdowns in the production process, ensuring the continuity of production.

[0105] Furthermore, through the design of the third component 6, the skewness of the film to be stretched 3 during the transportation process can be detected, and the problem of uneven force on the film caused by the unevenness of the transportation device and the stretching device can be discovered and avoided in time; specifically, the straightness of the stabilizing tube 602 can be judged by whether the push piece 604 can move smoothly in the stabilizing tube 602, thereby indirectly monitoring the condition of the film to be stretched 3 in the process from the transportation area to the stretching area, avoiding its skewness in the process, and ensuring that the film to be stretched 3 is in the correct position and posture when entering the stretching area, avoiding local deformation incoordination and material accumulation, thereby reducing the problem of uneven heat transfer caused by wrinkles; at the same time, it also greatly reduces the stress concentration caused by uneven force and wrinkles, reduces the possibility of film rupture at high temperature, ensures the integrity of the film, and meets the requirements of high-quality applications.

[0106] Please refer to the above working process Figure 2 、 Figure 3 、 Figure 6 .

[0107] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0108] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fully automatic PTFE film stretching and sintering machine, comprising: A sintering and heating chamber (1), a conveying member (2), and a film to be stretched (3), wherein the conveying member (2) is symmetrically arranged in the inner cavity of the sintering and heating chamber (1), and the film to be stretched (3) is located in the middle of the conveying member (2), and is characterized in that it also includes: a first component (4), a second component (5), and a third component (6), wherein the first component (4) and the second component (5) are located on the same vertical plane, and the third component (6) is located on one side of the first component (4); The first component (4) is used to adjust the thickness uniformity of the film to be stretched (3) to ensure uniform tensile stress so as to obtain a PTFE film without damage or tearing; The second component (5) is used to assist in the bubble elimination process of the film (3) to be stretched in a hot and humid environment when the first component (4) adjusts the thickness uniformity of the film (3) to be stretched; The third component (6) is used to detect the position of the device, ensuring that the position of the device and the film to be stretched (3) transported by the conveying member (2) are in an aligned state, thereby providing a guarantee for the normal operation of the first component (4) and the second component (5); The first component (4) includes a main frame (401) arranged in the inner cavity of the sintering and heating chamber (1), a screw (402) is rotatably connected to the main frame (401), a transverse groove for sliding of a follower (403) is provided on the top wall of the inner cavity of the main frame (401), the screw (402) is threadedly connected to the follower (403), the follower (403) slides transversely in the transverse groove provided on the top wall of the inner cavity of the main frame (401), and a water pump tank (607) is fixedly connected to the upper surface of the main frame (401); A sliding groove is provided at the bottom of the driven member (403), and the driven member (403) is slidably connected to a connecting column A (404) through the bottom sliding groove. The bottom of the connecting column A (404) is rotatably connected to a connecting column B (405). The bottom of the connecting column B (405) is fixedly connected to a main swing shell (406). The inner cavity of the main swing shell (406) is slidably connected to a secondary swing shell (407). An ironing plate (408) is fixedly connected to the bottom surface of the inner cavity of the sintering and heating chamber (1) below the main frame (401).

2. The fully automatic PTFE film stretching and sintering machine according to claim 1, characterized in that: The second component (5) includes a serpentine groove (501) provided on the main frame (401), a guide piece (502) is slidably connected in the serpentine groove (501), and the guide piece (502) is fixedly connected to the connecting column B (405).

3. A fully automatic PTFE film stretching and sintering machine according to claim 2, characterized in that: The top wall of the inner cavity of the main swing shell (406) is fixedly connected to a hollow cover shell (503), the inner cavity surface of the auxiliary swing shell (407) is fixedly connected to a docking column cavity component (504), the inner cavity of the docking column cavity component (504) is fixedly connected to a return spring A (505), and the top of the return spring A (505) is fixedly connected to the hollow cover shell (503).

4. The fully automatic PTFE film stretching and sintering machine according to claim 1, characterized in that: The inner wall of the main swing housing (406) is symmetrically provided with sliding grooves (506), and the tops of the two side walls of the auxiliary swing housing (407) are fixedly connected with limiting blocks (507).

5. The fully automatic PTFE film stretching and sintering machine according to claim 1, characterized in that: The third component (6) includes a support block (601) fixedly connected to the inner cavity of the sintering and heating chamber (1), a stabilizing tube (602) fixedly connected to the support block (601), a return spring B (603) fixedly connected inside the stabilizing tube (602), and a push piece (604) fixedly connected to one end of the return spring B (603).

6. The fully automatic PTFE film stretching and sintering machine according to claim 5, characterized in that: A Hall switch clamp (605) is provided on the stabilizing tube (602), and the inner end of the stabilizing tube (602) is fixedly connected to a water pipe (606), and one end of the water pipe (606) away from the stabilizing tube (602) is fixedly connected to the main swing housing (406).

7. A fully automatic PTEE film stretching and sintering method, applied to the fully automatic PTEE film stretching and sintering machine according to any one of claims 1 to 6, characterized in that: The following steps are involved: Raw material preparation, stretching and elongation operation, sintering pretreatment, sintering treatment, cooling, quality inspection; The raw material preparation includes: selecting PTFE resin material, checking its purity and original physical state to ensure that there are no obvious defects; heating and mixing the PTFE material; The stretching and extending operation: the mixed PTFE resin is passed through a film degreasing, recycling and stretching machine to be initially stretched into a strip shape, and then the PTFE strip is initially processed into a PTFE tape, and then the PTFE tape is stretched again through an automatic laminating machine to form a preliminary PTFE film; The sintering pretreatment: This process is mainly used to readjust the thickness uniformity of the to-be-stretched film (3) with different thicknesses before sintering through the cooperation of the auxiliary swing shell (407) at the bottom of the main swing shell (406) and the ironing plate (408), and to make the auxiliary swing shell (407) on the main swing shell (406) swing with the assistance of the serpentine groove (501). While assisting in the thickness uniformity readjustment, the bubble elimination work is performed on the to-be-stretched film (3) in a humid and hot environment. At the same time, the push piece (604) slides back and forth in the stabilizing tube (602) to indirectly detect and feedback the straightness of the stabilizing tube (602), so as to avoid the situation where the skewness of the conveying affects the stability of the subsequent stretching process.

8. The fully automatic PTFE film stretching and sintering method according to claim 7, characterized in that: The sintering process includes: after the pretreatment is completed, the PTFE material is fed into the sintering area and the temperature is raised to the sintering temperature, which is generally between 383°C and 400°C; the sintering time is determined based on the thickness of the PTFE material and the required film properties; during the sintering process, the temperature is maintained stable. The heating structure and temperature feedback control system are used to ensure that the temperature fluctuation in the entire sintering area is within the process requirements, so that the PTFE material is fully sintered at high temperature and the molecular structure is stabilized and optimized; The cooling includes: after sintering is completed, starting the cooling system, using air cooling or water cooling to quickly cool the PTFE film to a process cooling temperature range through an air cooling or water cooling process, and the cooling speed should be moderate to avoid stress inside the film due to excessive cooling or affecting production efficiency due to excessive cooling; The quality inspection includes: quality inspection of the PTFE film after stretching and sintering, and the inspection items include the film's thickness, thickness uniformity, tensile strength, elongation at break, air permeability, corrosion resistance and other physical and chemical performance indicators; using measuring instruments and professional testing equipment to ensure that the film's performance indicators meet relevant product standards and application requirements.

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