Preparation method of a grey polyester film for cold laminating iron film

Abstract

This application belongs to the technical field of composite materials, and particularly relates to a preparation method of a gray polyester film for cold laminating iron films, comprising the following steps: S1. Weigh the raw materials in proportion and mix them in the same phase. Feed the sliced base polyester raw materials and the sliced surface polyester raw materials into the corresponding extrusion systems respectively for melt extrusion; S2. The base melt and the surface melt pass through a coextrusion die head to form a polyester thick sheet on a rotating cooling roll; S3. Preheat the product obtained in S2 and then perform longitudinal and transverse stretching in sequence; S4. Heat-set the product after stretching in S3, then cool and wind it up to obtain a polyester film; S5. Cut the wound polyester film through processing equipment to obtain a sheet-shaped polyester film. The beneficial effects of this application are as follows: In this application, the polyester film can be processed by known processing techniques in the art, such as the tubular film process, the flat film process, etc. The molten base and surface polyester melts are coextruded from a T-die head onto a rapidly cooled drum to ensure that the copolyester is quenched to an amorphous state.

Description

Technical Field

[0001] This application belongs to the technical field of composite materials, and particularly relates to a preparation method of a gray polyester film for cold laminating iron films. Background Art

[0002] The metal plate laminating technology is a processing technology that laminates a plastic film onto a metal plate through high-temperature hot pressing. The laminating technology was born in Japan in 1977 and was initially used for can making, replacing the inner coating and outer coating technologies. So far, it has developed into various fields such as interior decoration of building materials, outer shells of household appliances, and interior decoration of ships. Polyester films have the characteristics of high mechanical strength, good optical properties, wide operating temperature range, excellent barrier properties, oil resistance, corrosion resistance, and low cost, and are widely used in laminated iron composite materials. However, there are many problems in the automated processing of polyester films. For example, when cutting polyester films, wrinkles and warping are easily formed in the polyester films after being pulled out, ultimately resulting in uneven edges of the sliced polyester films.

[0003] In the patent with the publication number CN113070935B, it discloses an automated processing system for polyester films, including a support frame, a flattening mechanism, a transverse cutting mechanism, a conveying mechanism, a feeding mechanism, and a slicing mechanism.

[0004] The above patent can flatten the polyester film pulled out from the polyester film roll through the setting of the flattening mechanism, avoiding the phenomenon of uneven edges of the sliced polyester film caused by wrinkles and warping when slicing the polyester film later. However, during subsequent cutting, the above patent uses the cooperation of a cam, a push rod, and a lower pressing plate to drive the cutting knife to operate intermittently, and the structure is not stable, and it is easy to cause the cutting knife to deviate, thereby affecting the cutting accuracy of the polyester film and resulting in uneven edge cutting. Summary of the Invention

[0005] The purpose of this application is to provide a preparation method of a gray polyester film for cold laminating iron films, which can solve the above problems.

[0006] The purpose of this application is to provide a preparation method of a gray polyester film for cold laminating iron films, including the following steps:

[0007] S1. Weigh the raw materials according to the proportion and mix them in the same phase. Then, slice the mixed base polyester raw materials and surface polyester raw materials, and send them into the corresponding extrusion systems for melting and extrusion respectively.

[0008] S2. The base melt and the surface melt pass through a coextrusion die head and form a polyester thick sheet on a rotating cooling roll.

[0009] S3. The product obtained in S2 is preheated and then subjected to longitudinal and transverse stretching in sequence.

[0010] S4. Heat-set the stretched product obtained in S3, then cool it and wind it up to obtain a polyester film.

[0011] S5. Cut the wound polyester film by a processing device to obtain sheet-shaped polyester films.

[0012] For the preparation method of the gray polyester film for cold laminating iron film described above, in this application, the polyester film can be processed by known processing techniques in the art, such as the tube film process, the flat film process, etc. The molten base layer and surface layer polyester melts are co-extruded from a T-die onto a quenching roller to ensure that the copolyester is quenched to an amorphous state, and then biaxially stretched and oriented, so that the film is biaxially oriented and stretched in two mutually perpendicular directions in the plane to obtain excellent mechanical and physical properties, and a polymer film is obtained.

[0013] Further, the above-mentioned processing device includes:

[0014] A frame;

[0015] A conveying device, which is arranged on the frame and is used for conveying the polyester film;

[0016] A cutting device, which is arranged on the frame and is used for cutting the polyester film;

[0017] Wherein, a collection box is arranged at the bottom of the cutting device, and the collection box is used for collecting the cut polyester film.

[0018] The processing device in this application is used for cutting the stretched polyester film. The wound film roll is introduced through the conveying device and conveyed by the conveying device to the cutting device. The cutting device cuts the conveyed polyester film, and the cut sheet-shaped polyester films are collected through the collection box.

[0019] Further: The cutting device includes:

[0020] A longitudinal cutting device;

[0021] A transverse cutting device;

[0022] A flattening device, which includes a plurality of press roller groups arranged at intervals. Each press roller group is composed of upper and lower press rollers arranged at intervals, and the polyester film is located between the two press rollers;

[0023] Wherein, the longitudinal cutting device is arranged between the flattening device and the transverse cutting device, and includes an adjusting frame and a longitudinal cutting knife arranged on the adjusting frame. The adjusting frame is arranged on the frame.

[0024] The cutting device consists of a longitudinal cutting device, a transverse cutting device and a flattening device. The polyester film conveyed by the conveying device is flattened by the flattening device to flatten the wrinkles on the polyester film and prevent the polyester film from being affected by wrinkles during cutting. Among them, the flattening device includes a plurality of pressing roller groups arranged at intervals, and each pressing roller group is composed of pressing rollers arranged at intervals up and down. The polyester film is located between two pressing rollers, and the two pressing rollers arranged at intervals up and down flatten the polyester film. After flattening, longitudinal cutting is carried out first, and then transverse cutting is carried out. Among them, the longitudinal cutting knife in the longitudinal cutting device is fixedly arranged, and the polyester film is pulled by the conveying device. After passing through the longitudinal cutting knife, the cutting is automatically completed. However, the adjusting frame and the longitudinal cutting knife are detachably connected, and the longitudinal cutting knife can be replaced at any time, and the height and position of the longitudinal cutting knife can also be adjusted at any time.

[0025] Further, the transverse cutting device includes:

[0026] A support frame is arranged on the frame. A cylinder is arranged on the support frame, and the cylinder is connected with a regulating valve;

[0027] A sliding frame is arranged on the output shaft of the cylinder. A plurality of transverse cutting knives are arranged at the bottom of the sliding frame;

[0028] An adjusting structure is arranged on the support frame and contacts the polyester film;

[0029] An anti-offset structure is arranged on the support frame and connected with the sliding frame;

[0030] Among them, the adjusting structure is located between the transverse cutting knife and the longitudinal cutting knife.

[0031] After the polyester film is longitudinally cut, it needs to be transversely cut. The transverse cutting is used to cut the polyester film into sheets. The cutting work of the polyester film can be completed by the cooperation of the support frame, the cylinder, the sliding frame and a plurality of transverse cutting knives. However, since the transverse cutting knife is not a fixed cutting knife but works intermittently under the action of the cylinder, in order to avoid the longitudinal cutting knife from shifting during cutting, affecting the cutting accuracy of the polyester film and resulting in uneven edge cutting, the present application provides an adjusting mechanism and an anti-offset structure to avoid the occurrence of the above problems.

[0032] Further, the adjusting structure includes:

[0033] An adjusting roller is arranged on the support frame, and adjusting sliders are arranged at both ends thereof. Adjusting chutes cooperating with the adjusting sliders are arranged on the support frame, and the cross sections of the adjusting chutes and the adjusting sliders are circular;

[0034] A support plate is arranged above the adjusting slider, and an adjusting guide post is arranged at the top of the support plate;

[0035] Upper limit frame, which is arranged at the top of the adjustment chute and wraps around the adjustment guide post, and the upper limit frame is slidably matched with the adjustment guide post;

[0036] Control board group, including a lower control board arranged on the adjustment guide post and an upper control board arranged in the upper limit frame;

[0037] Wherein, the upper control board is located at the top of the adjustment chute.

[0038] Since the adjustment structure is located between the transverse cutting knife and the longitudinal cutting knife, therefore, the polyester film after being cut by the longitudinal cutting knife will pass through the adjustment structure first when being transversely cut. When the polyester film passes through the adjustment structure, due to the thickness of the polyester film, polyester films with different thicknesses require different forces to drive the transverse cutting knife, preventing the problem that part of the polyester film is connected due to insufficient cutting force, and also avoiding additional wear of the cutting knife due to excessive cutting force. Therefore, a corresponding structure for adjusting the cutting force of the transverse cutting knife is needed.

[0039] When the polyester film passes through the adjustment roller, the adjustment roller moves upward and drives the adjustment slider to move upward along the adjustment chute. Since the lower control board is arranged on the adjustment guide post, the movement of the adjustment slider will drive the lower control board to move upward through the adjustment guide post, thereby making the lower control board contact the upper control board. After the lower control board contacts the upper control board, the air cylinder will be opened and work, intermittently driving the sliding frame to move downward, so that multiple transverse cutting knives at the bottom of the sliding frame cut the polyester film. Among them, the upper limit frame is arranged to limit the movement of the adjustment guide post, prevent the adjustment guide post from shifting, and enable the lower control board and the upper control board to accurately contact. In addition, during the contact process between the adjustment roller and the polyester film, as long as the polyester film passes through the adjustment roller, the upper control board and the lower control board above the adjustment roller will contact, and when there is no polyester film passing through, the upper control board and the lower control board will separate, which can accurately control the operation of the transverse cutting device and make it match the transportation law of the polyester film.

[0040] Furthermore, the adjustment structure further includes:

[0041] Lower limit frame, which is arranged on the adjustment slider, and the support plate is located in the lower limit frame and can slide in the lower limit frame;

[0042] Spring assembly, including a first spring and a second spring arranged on both sides of the support plate and a third spring arranged in the adjustment chute;

[0043] Contact assembly, including a connecting rod arranged on the top of the adjustment slider and a contact plate arranged on the inner wall of the adjustment chute, and a contact point in contact with the contact plate is arranged on the connecting rod.

[0044] Wherein, both ends of the third spring are respectively connected to the adjustment chute and the adjustment slider and are located inside the connecting rod. The contact is slidably connected to the contact plate, and the contact plate is a resistance wire.

[0045] In order to make the cutting force adaptable to the polyester film with the current thickness, the present application further provides a lower limit frame, a spring assembly and a contact assembly. After the upper control plate and the lower control plate come into contact, affected by the first spring, the second spring and the support plate, the adjustment slider will continue to move upward along the adjustment chute. At this time, affected by the upward movement of the adjustment slider, the connecting rod on the adjustment slider drives the contact to contact the contact plate and slide along the contact plate. Since the contact plate will be powered on after the upper control plate and the lower control plate come into contact, and as the contact gradually moves upward, the resistance will gradually decrease and the current will gradually increase. The controller controls the regulating valve according to the change of the current to adjust, so that the force of the cylinder driving the horizontal cutting knife can change in real time, making it adaptable to the polyester film with the current thickness. The thicker the thickness, the greater the corresponding cutting force, which can avoid the polyester film from not being cut off and prevent the blade from being additionally worn. In addition, in order to facilitate subsequent resetting, the present application also provides a third spring due to the subsequent reset work.

[0046] Further, the anti-offset structure includes:

[0047] Guide chutes provided on both sides of the support frame;

[0048] Guide sliders provided in the guide chutes and connected to the sliding frame;

[0049] The slider assembly includes an upper slider connected to the guide slider and a lower slider hinged to the upper slider. Inner chutes for the upper slider and the lower slider to slide are provided in the guide chutes;

[0050] The damping assembly includes a damping rod provided in the inner chute and connected to the upper slider, and a fourth spring connected to the lower slider;

[0051] Wherein, a turning groove recessed inward is provided at the bottom of the inner chute, and the lower slider can slide in the turning groove.

[0052] As the cylinder drives the sliding frame to move on the support frame, when the sliding frame moves up and down, the guiding sliders on both sides of the sliding frame move along the guiding chute as the sliding frame moves. As the guiding sliders move, the upper sliders connected to the guiding sliders also move accordingly, and drive the lower sliders hinged thereto to move along the inner chute together. Since the damping rod is connected to the upper slider and the fourth spring is connected to the lower slider, when the sliding frame moves, it will drive the damping rod to expand and contract and the fourth spring to stretch and compress, thus playing a damping and buffering role, making the up and down movement of the sliding frame more stable. Furthermore, it makes the lateral cutting knife more evenly stressed and more stable during cutting, thereby improving the cutting accuracy, avoiding deviation during cutting, and enabling the edge of the polyester film cutting to be neater.

[0053] Meanwhile, by providing a turning groove recessed inward at the bottom of the inner chute, the lower slider can slide in the turning groove. The turning groove is communicated with the inner chute. When the lower slider moves to the junction of the turning groove and the inner chute, the angle between the lower slider and the upper slider changes, and the lower slider enters the turning groove. However, since the turning groove is arc-shaped, the upper slider can move further but cannot enter the turning groove. As the lower slider moves, the fourth spring connected to the lower slider is further stretched, further playing a buffering role. Moreover, due to the turning of the lower slider, the axial force exerted by the cylinder can be dispersed in the bending direction of the turning groove, making the force received by the lateral cutting knife more stable and ensuring the cutting stability. At the same time, when retracting after cutting, the lower slider retracts from the turning groove to the inner groove as the upper slider resets. During the retraction process, it will also perform damping and buffering through the damping rod and the fourth spring, so that the lateral cutting knife is more stable during resetting, correcting the next cutting and making the next cutting more stable.

[0054] Furthermore, it further includes a controller, and the controller is connected to the cylinder, the regulating valve, the contact assembly, the upper control board, and the lower control board.

[0055] The beneficial effects of this application are:

[0056] 1. Adopting the above-mentioned preparation method of a gray polyester film for cold laminating iron film, the polyester film in this application can be processed by known processing techniques in the field, such as the tube film process, the flat film process, etc. The molten base layer and surface layer polyester melts are co-extruded from a T-shaped die head onto a rapidly cooled roller to ensure that the copolyester is rapidly cooled to an amorphous state, and then biaxially stretched and oriented, so that the film is biaxially oriented and stretched in two mutually perpendicular directions on the plane to obtain excellent mechanical and physical properties, and a polymer film is obtained;

[0057] 2. After the upper control board and the lower control board come into contact, the adjusting slider continues to move upward along the adjusting chute. At this time, the connecting rod on the adjusting slider drives the contact to contact the contact plate and slide along the contact plate. As the contact gradually moves upward, the resistance will gradually decrease and the current will gradually increase. The controller controls the regulating valve according to the change in the current, so that the force of the air cylinder driving the horizontal cutting knife can change in real time, enabling it to adapt to the current thickness of the polyester film. The thicker the thickness, the greater the corresponding cutting force, which can avoid the polyester film from not being cut off and prevent additional wear of the blade. In addition, for the convenience of subsequent reset, a third spring is also provided in this application due to the subsequent reset work;

[0058] 3. As the air cylinder drives the sliding frame to move on the support frame, as the sliding frame moves up and down, the guiding slider moves along the guiding chute as the sliding frame moves. As the guiding slider moves, the upper slider connected to the guiding slider also moves accordingly, and drives the lower slider hinged to it to move along the inner chute. Since the damping rod is connected to the upper slider and the fourth spring is connected to the lower slider, when the sliding frame moves, it will drive the damping rod to expand and contract and the fourth spring to stretch and compress, thus playing a damping and buffering role, making the up and down movement of the sliding frame more stable. Furthermore, the horizontal cutting knife is more evenly stressed and moves more stably during cutting, thereby improving the cutting accuracy and avoiding deviation during cutting, and making the cut edge of the polyester film neater. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a schematic structural diagram of the present invention;

[0060] Figure 2 is a schematic structural diagram of another perspective of the present invention;

[0061] Figure 3 is a top view of the present invention;

[0062] Figure 4 is Figure 3 a cross-sectional view taken along the A-A direction in

[0063] Figure 5 is Figure 4 an enlarged view of A in

[0064] Figure 6 is Figure 3 a cross-sectional view taken along the B-B direction in

[0065] Figure 7 is Figure 6 an enlarged view of B in

[0066] Figure 8 is Figure 3 a cross-sectional view taken along the C-C direction in

[0067] The reference numerals in the figure are: 100, frame; 200, transmission device; 300, flattening device; 310, flattening roller set; 400, longitudinal cutting device; 410, adjusting frame; 420, longitudinal cutting knife; 500, transverse cutting device; 510, support frame; 520, cylinder; 530, sliding frame; 540, transverse cutting knife; 600, adjusting structure; 610, adjusting roller; 611, adjusting slider; 612, adjusting chute; 620, support plate; 621, adjusting guide post; 630, upper limit frame; 640, upper control plate; 641, lower control plate; 650, lower limit frame; 660, first spring; 661, second spring; 662, third spring; 670, connecting rod; 671, contact plate; 672, contact point; 700, anti-offset structure; 710, guiding chute; 720, guiding slider; 730, upper slider; 731, lower slider; 740, inner chute; 750, damping rod; 760, fourth spring; 770, turning groove. Detailed implementation mode

[0068] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0069] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0070] Next, in conjunction with the accompanying drawings, the preparation method of the gray polyester film for cold iron film lamination provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0071] Embodiment 1:

[0072] The embodiment of the present application provides a preparation method of a gray polyester film for cold iron film lamination, including the following steps:

[0073] S1. Weigh the raw materials according to the ratio and mix them in the same phase. Then, feed the sliced base polyester raw materials and the sliced surface polyester raw materials into the corresponding extrusion systems respectively for melting and extrusion;

[0074] S2. The base melt and the surface melt form a polyester thick sheet on a rotating cooling roll through a co-extrusion die head.

[0075] S3. The preheated product obtained in S2 is successively longitudinally and transversely stretched.

[0076] S4. The product after stretching in S3 is heat-set, then cooled and wound to obtain a polyester film.

[0077] S5. The wound polyester film is cut by a processing device to obtain a sheet-shaped polyester film.

[0078] In some embodiments of the present application, the preparation method of the gray polyester film for cold laminating iron film is adopted. In the present application, the polyester film can be processed by known processing techniques in the art, such as the tube film process, the flat film process, etc. The molten base and surface polyester melts are co-extruded from a T-die head onto a quenching drum to ensure that the copolyester is quenched to an amorphous state, and then biaxially stretched and oriented, so that the film is biaxially oriented and stretched in two mutually perpendicular directions in the plane to obtain excellent mechanical and physical properties and obtain a polymer film.

[0079] Example 2:

[0080] The embodiment of the present application provides a preparation method of a gray polyester film for cold laminating iron film. In addition to including the above technical features, the preparation method of the gray polyester film for cold laminating iron film in the embodiment of the present application further includes the following technical features.

[0081] As Figures 1 to 3 and Figure 8 shown, the above processing device includes:

[0082] A frame 100;

[0083] A transmission device 200, arranged on the frame 100 and used for conveying the polyester film;

[0084] A cutting device, arranged on the frame 100 and used for cutting the polyester film;

[0085] Wherein, a collection box is arranged at the bottom of the cutting device, and the collection box is used for collecting the cut polyester film.

[0086] In the embodiment of the present application, the processing device in the present application is used for cutting the stretched polyester film. The wound film roll is imported through the transmission device 200 and conveyed by the transmission device 200 to the cutting device, and the cutting device cuts the conveyed polyester film, and the cut sheet-shaped polyester film is collected through the collection box.

[0087] Moreover, the cutting device includes:

[0088] Longitudinal cutting device 400;

[0089] Transverse cutting device 500;

[0090] Flattening device 300, including a plurality of roller groups 310 arranged at intervals, each roller group 310 is composed of upper and lower rollers arranged at intervals, and the polyester film is located between the two rollers;

[0091] Among them, the longitudinal cutting device 400 is arranged between the flattening device 300 and the transverse cutting device 500, and includes an adjusting frame 410 and a longitudinal cutting knife 420 arranged on the adjusting frame 410, and the adjusting frame 410 is arranged on the frame 100.

[0092] In some embodiments of the present application, the cutting device is composed of a longitudinal cutting device 400, a transverse cutting device 500 and a flattening device 300. The polyester film conveyed by the conveying device 200 is flattened by the flattening device 300, and the wrinkles on the polyester film are flattened to prevent the polyester film from being affected by the wrinkles during cutting. Among them, the flattening device 300 includes a plurality of roller groups 310 arranged at intervals, each roller group 310 is composed of upper and lower rollers arranged at intervals, and the polyester film is located between the two rollers. The two upper and lower rollers flatten the polyester film. After flattening, longitudinal cutting is performed first, and then transverse cutting is performed. Among them, the longitudinal cutting knife 420 in the longitudinal cutting device 400 is fixedly arranged, and the polyester film is pulled by the conveying device 200. After the polyester film passes through the longitudinal cutting knife 420, cutting is automatically completed. However, the adjusting frame 410 and the longitudinal cutting knife 420 are detachably connected, and the longitudinal cutting knife 420 can be replaced at any time, and the height and position of the longitudinal cutting knife 420 can also be adjusted at any time.

[0093] Embodiment 3:

[0094] The embodiment of the present application provides a preparation method of a gray polyester film for cold laminating iron film. In addition to including the above technical features, the preparation method of the gray polyester film for cold laminating iron film in the embodiment of the present application further includes the following technical features.

[0095] As Figures 1 to 3 and Figure 8 shown, the transverse cutting device 500 includes:

[0096] A support frame 510, arranged on the frame 100, a cylinder 520 is arranged on the support frame 510, and the cylinder 520 is connected with a regulating valve;

[0097] A sliding frame 530, arranged on the output shaft of the cylinder 520, and a plurality of transverse cutting knives 540 are arranged at the bottom of the sliding frame 530;

[0098] An adjustment structure 600 is disposed on the support frame 510 and contacts the polyester film;

[0099] An anti-offset structure 700 is disposed on the support frame 510 and connected to the sliding frame 530;

[0100] Among them, the adjustment structure 600 is located between the transverse cutting knife 540 and the longitudinal cutting knife 420.

[0101] In the embodiment of the present application, after the polyester film is longitudinally cut, it needs to be transversely cut. The transverse cutting is used to cut the polyester film into sheets. Through the cooperation of the support frame 510, the cylinder 520, the sliding frame 530, and multiple transverse cutting knives 540, the cutting work of the polyester film can be completed. However, since the transverse cutting knife 540 is not a fixed cutting knife but intermittently works under the action of the cylinder 520, in order to prevent the longitudinal cutting knife 420 from shifting during cutting, affecting the cutting accuracy of the polyester film, and thus resulting in uneven edge cutting, the present application provides an adjustment mechanism and an anti-offset structure 700 to avoid the occurrence of the above problems.

[0102] Embodiment 4:

[0103] The embodiment of the present application provides a preparation method of a gray polyester film for cold laminating iron film. In addition to including the above technical features, the preparation method of the gray polyester film for cold laminating iron film in the embodiment of the present application further includes the following technical features.

[0104] As Figure 1 、 Figure 4 and Figure Figure 5 shown, the adjustment structure 600 includes:

[0105] An adjustment roller 610 is disposed on the support frame 510, and adjustment sliders 611 are provided at both ends thereof. An adjustment chute 612 cooperating with the adjustment sliders 611 is provided on the support frame 510, and the cross-sections of the adjustment chute 612 and the adjustment sliders 611 are circular;

[0106] A support plate 620 is disposed above the adjustment slider 611, and an adjustment guide post 621 is provided at the top of the support plate 620;

[0107] An upper limit frame 630 is disposed at the top of the adjustment chute 612 and wraps outside the adjustment guide post 621, and the upper limit frame 630 is slidably matched with the adjustment guide post 621;

[0108] A control board group includes a lower control board 641 disposed on the adjustment guide post 621 and an upper control board 640 disposed inside the upper limit frame 630;

[0109] Among them, the upper control board 640 is located at the top of the adjustment chute 612.

[0110] In the embodiment of the present application, since the adjusting structure 600 is located between the transverse cutting knife 540 and the longitudinal cutting knife 420, when the polyester film after being cut by the longitudinal cutting knife 420 is transversely cut, it will first pass through the adjusting structure 600. When the polyester film passes through the adjusting structure 600, due to the thickness of the polyester film, different thicknesses of polyester films require different forces to drive the transverse cutting knife 540, preventing the problem that part of the polyester film is connected due to insufficient cutting force and also avoiding additional wear of the cutting knife due to excessive cutting force. Therefore, a corresponding structure for adjusting the cutting force of the transverse cutting knife 540 is required.

[0111] After the polyester film passes through the adjusting roller 610, the adjusting roller 610 moves upward and drives the adjusting slider 611 to move upward along the adjusting chute 612. Since the lower control plate 641 is located on the adjusting guide post 621, the movement of the adjusting slider 611 will drive the lower control plate 641 to move upward through the adjusting guide post 621, thereby causing the lower control plate 641 to contact the upper control plate 640. After the lower control plate 641 contacts the upper control plate 640, the air cylinder 520 will be activated and operate, intermittently driving the sliding frame 530 to move downward, so that the multiple transverse cutting knives 540 at the bottom of the sliding frame 530 cut the polyester film. Among them, the upper limit frame 630 is provided to limit the movement of the adjusting guide post 621, preventing the adjusting guide post 621 from shifting, so that the lower control plate 641 can accurately contact the upper control plate 640. In addition, during the contact process between the adjusting roller 610 and the polyester film, as long as the polyester film passes through the adjusting roller 610, the upper control plate 640 and the lower control plate 641 located above the adjusting roller 610 will contact, and when no polyester film passes through, the upper control plate 640 and the lower control plate 641 will separate, which can accurately control the operation of the transverse cutting device 500 and make it match the transportation law of the polyester film.

[0112] Further, the adjusting structure 600 further includes:

[0113] A lower limit frame 650, which is arranged on the adjusting slider 611, and the support plate 620 is located inside the lower limit frame 650 and can slide inside the lower limit frame 650;

[0114] A spring assembly, including a first spring 660 and a second spring 661 arranged on both sides of the support plate 620 and a third spring 662 arranged inside the adjusting chute 612;

[0115] A contact assembly, including a connecting rod 670 arranged on the top of the adjusting slider 611 and a contact plate 671 arranged on the inner wall of the adjusting chute 612, and a contact point 672 in contact with the contact plate 671 is arranged on the connecting rod 670.

[0116] Among them, both ends of the third spring 662 are respectively connected to the adjustment chute 612 and the adjustment slider 611 and are located inside the connecting rod 670. The contact 672 is slidably connected to the contact plate 671, and the contact plate 671 is a resistance wire.

[0117] In some embodiments of the present application, in order to make the cutting force adaptable to the polyester film of the current thickness, the present application also provides a lower limit frame 650, a spring assembly and a contact assembly. After the upper control plate 640 and the lower control plate 641 come into contact, affected by the first spring 660, the second spring 661 and the support plate 620, the adjustment slider 611 will continue to move upward along the adjustment chute 612. At this time, affected by the upward movement of the adjustment slider 611, the connecting rod 670 located on the adjustment slider 611 drives the contact 672 to contact the contact plate 671 and slide along the contact plate 671. Since the contact plate 671 is electrified after the upper control plate 640 and the lower control plate 641 come into contact, and as the contact 672 gradually moves upward, the resistance will gradually decrease and the current will gradually increase. The controller controls the regulating valve for adjustment according to the change in the current, so that the force of the cylinder 520 driving the horizontal cutting knife 540 can change in real time, making it adaptable to the polyester film of the current thickness. The thicker the thickness, the greater the corresponding cutting force, which can avoid the polyester film from not being cut off and prevent additional wear of the blade. In addition, for the convenience of subsequent reset, the present application also provides a third spring 662 for subsequent reset work.

[0118] Embodiment 5:

[0119] The embodiment of the present application provides a preparation method of a gray polyester film for cold laminating iron film. In addition to including the above technical features, the preparation method of the gray polyester film for cold laminating iron film in the embodiment of the present application further includes the following technical features.

[0120] As Figure 6 and Figure 7 shown, the anti-offset structure 700 includes:

[0121] The guiding chute 710 is arranged on both sides of the support frame 510;

[0122] The guiding slider 720 is arranged in the guiding chute 710 and is connected to the sliding frame 530;

[0123] The slider assembly includes an upper slider 730 connected to the guiding slider 720 and a lower slider 731 hinged to the upper slider 730. An inner chute 740 for the upper slider 730 and the lower slider 731 to slide is arranged in the guiding chute 710;

[0124] The damping assembly includes a damping rod 750 arranged in the inner chute 740 and connected to the upper slider 730, and a fourth spring 760 connected to the lower slider 731;

[0125] Among them, a turning groove 770 recessed inward is provided at the bottom of the inner sliding groove 740, and the lower sliding block 731 can slide in the turning groove 770.

[0126] In the embodiment of the present application, as the cylinder 520 drives the sliding frame 530 to move on the support frame 510, and the sliding frame 530 moves up and down, the guiding sliders 720 located on both sides of the sliding frame 530 move along the guiding sliding grooves as the sliding frame 530 moves. With the movement of the guiding sliders 720, the upper sliding block 730 connected to the guiding sliders 720 also moves accordingly, and drives the lower sliding block 731 hinged thereto to move along the inner sliding groove 740 together. Since the damping rod 750 is connected to the upper sliding block 730 and the fourth spring 760 is connected to the lower sliding block 731, when the sliding frame 530 moves, it will drive the damping rod 750 to stretch and contract and the fourth spring 760 to stretch and compress, thereby playing a damping and buffering role, making the up and down movement of the sliding frame 530 more stable. Furthermore, when the transverse cutting knife 540 cuts, the force received is more uniform and the movement is more stable, thereby improving the cutting accuracy, avoiding deviation during cutting, and making the edge of the cut polyester film neater.

[0127] At the same time, by providing a turning groove 770 recessed inward at the bottom of the inner sliding groove 740, the lower sliding block 731 can slide in the turning groove 770. The turning groove 770 is communicated with the inner sliding groove 740. When the lower sliding block 731 moves to the junction of the turning groove 770 and the inner sliding groove 740, the angle between the lower sliding block 731 and the upper sliding block 730 changes, and the lower sliding block 731 enters the turning groove 770. However, since the turning groove 770 is arc-shaped, the upper sliding block 730 can move further but cannot enter the turning groove 770. As the lower sliding block 731 moves, the fourth spring 760 connected to the lower sliding block 731 is further stretched, further playing a buffering role. Moreover, due to the turning of the lower sliding block 731, the force in the axial direction applied by the cylinder 520 can be dispersed in the bending direction of the turning groove 770, making the force received by the transverse cutting knife 540 more stable and ensuring the stability of cutting. At the same time, when retracting after cutting, the lower sliding block 731 retracts from the turning groove 770 into the inner groove as the upper sliding block 730 resets. During the retraction process, damping and buffering are also performed through the damping rod 750 and the fourth spring 760, so that the transverse cutting knife 540 is more stable during resetting, correcting the next cutting and making the next cutting more stable.

[0128] Embodiment 6:

[0129] The embodiment of the present application provides a preparation method of a gray polyester film for cold laminating iron film. In addition to including the above technical features, the preparation method of the gray polyester film for cold laminating iron film in the embodiment of the present application further includes the following technical features.

[0130] It further includes a controller, which is connected to the cylinder 520, the regulating valve, the contact assembly, the upper control board 640, and the lower control board 641.

[0131] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0132] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A preparation method of a gray polyester film for cold laminating iron film, characterized in that: It includes the following steps: S1. Weigh the raw materials in proportion and mix them in the same phase. Then, feed the mixed base polyester raw material slices and surface polyester raw material slices into the corresponding extrusion systems respectively for melt extrusion. S2. The base melt and the surface melt pass through the coextrusion die head and form a polyester thick sheet on the rotating cooling roll. S3. Preheat the product obtained in S2 and then perform longitudinal and transverse stretching in sequence. S4. Heat-set the product after stretching in S3, then cool it and wind it up to obtain a polyester film. S5. Cut the wound polyester film through processing equipment to obtain sheet-shaped polyester film. The above-mentioned processing equipment includes: A frame (100); A transmission device (200), which is arranged on the frame (100) and is used for conveying the polyester film; A cutting device, which is arranged on the frame (100) and is used for cutting the polyester film; Among them, a collection box is arranged at the bottom of the cutting device, and the collection box is used for collecting the cut polyester film; The cutting device includes: A longitudinal cutting device (400); A transverse cutting device (500); A flattening device (300), which includes a plurality of pressing roller groups (310) arranged at intervals. Each pressing roller group (310) is composed of upper and lower pressing rollers arranged at intervals, and the polyester film is located between the two pressing rollers; Among them, the longitudinal cutting device (400) is arranged between the flattening device (300) and the transverse cutting device (500), and includes an adjusting frame (410) and a longitudinal cutting knife (420) arranged on the adjusting frame (410). The adjusting frame (410) is arranged on the frame (100); The transverse cutting device (500) includes: A support frame (510), which is arranged on the frame (100). A cylinder (520) is arranged on the support frame (510), and the cylinder (520) is connected with a regulating valve; A sliding frame (530), which is arranged on the output shaft of the cylinder (520). A plurality of transverse cutting knives (540) are arranged at the bottom of the sliding frame (530); An adjusting structure (600), which is arranged on the support frame (510) and contacts the polyester film; An anti-offset structure (700), which is arranged on the support frame (510) and is connected with the sliding frame (530); Among them, the adjusting structure (600) is located between the transverse cutting knife (540) and the longitudinal cutting knife (420); The adjusting structure (600) includes: An adjusting roller (610), which is arranged on the support frame (510). Adjusting sliders (611) are arranged at both ends of it. Adjusting chutes (612) matching with the adjusting sliders (611) are arranged on the support frame (510). The cross-sections of the adjusting chutes (612) and the adjusting sliders (611) are circular; A support plate (620), which is arranged above the adjusting slider (611). An adjusting guide post (621) is arranged at the top of the support plate (620); An upper limit frame (630), which is arranged at the top of the adjusting chute (612) and wraps outside the adjusting guide post (621). The upper limit frame (630) is slidably matched with the adjusting guide post (621); A control board group, which includes a lower control board (641) arranged on the adjusting guide post (621) and an upper control board (640) arranged in the upper limit frame (630); Among them, the upper control board (640) is located at the top of the adjustment chute (612); The adjustment structure (600) further includes: A lower limit frame (650) is arranged on the adjustment slider (611), and the support plate (620) is located inside the lower limit frame (650) and can slide inside the lower limit frame (650); A spring assembly, including a first spring (660) and a second spring (661) arranged on both sides of the support plate (620), and a third spring (662) arranged inside the adjustment chute (612); A contact assembly, including a connecting rod (670) arranged on the top of the adjustment slider (611) and a contact plate (671) arranged on the inner wall of the adjustment chute (612), and a contact point (672) in contact with the contact plate (671) is arranged on the connecting rod (670); Among them, both ends of the third spring (662) are connected to the adjustment chute (612) and the adjustment slider (611) respectively and are located inside the connecting rod (670), the contact point (672) is slidably connected to the contact plate (671), and the contact plate (671) is a resistance wire.

2. The preparation method of a gray polyester film for cold laminating iron film according to claim 1, characterized in that, The anti-offset structure (700) includes: Guide chutes (710) are arranged on both sides of the support frame (510); Guide sliders (720) are arranged inside the guide chutes (710) and are connected to the sliding frame (530); A slider assembly, including an upper slider (730) connected to the guide slider (720) and a lower slider (731) hinged to the upper slider (730), and an inner chute (740) for the upper slider (730) and the lower slider (731) to slide is arranged inside the guide chute (710); A damping assembly, including a damping rod (750) arranged inside the inner chute (740) and connected to the upper slider (730), and a fourth spring (760) connected to the lower slider (731); Among them, a turning groove (770) recessed inward is arranged at the bottom of the inner chute (740), and the lower slider (731) can slide inside the turning groove (770).

3. The preparation method of a gray polyester film for cold laminating iron film according to claim 2, characterized in that: It further includes a controller, and the controller is connected to the air cylinder (520), the regulating valve, the contact assembly, the upper control board (640), and the lower control board (641).

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