Polyester film production equipment
By setting a cutter in the second shaping section of the polyester film production equipment to cut the side edges of the film, the problem of large longitudinal shrinkage was solved, the dimensional stability of the finished film was improved, and problems such as warping and degumming were avoided.
Patent Information
- Application Number
- CN202511001409.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2025-09-26
AI Technical Summary
The existing polyester film has a large longitudinal shrinkage rate, which causes significant shrinkage and deformation of the product during subsequent processes or actual use, such as warping and debonding.
A first cutter is set in the second shaping section of the polyester film production equipment to cut the side edge of the film, freeing it from the constraint of the chain clamp in the middle area, allowing the film to shrink in the transverse and longitudinal directions, and reducing the longitudinal shrinkage rate through stress relaxation.
It improves the dimensional stability of polyester film, reduces the longitudinal shrinkage of the finished film, and avoids problems such as warping and degumming.
Smart Images
Figure CN120697335A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of polyester film production equipment, in particular to polyester film production equipment and polyester film production equipment. Background Art
[0002] Polyester film, also known as PET film, is a transparent plastic film made of polyethylene terephthalate (PET), which is usually made using a biaxial stretching process. The process flow of biaxial stretching usually includes: raw material mixing, drying, extrusion, sheet casting, longitudinal stretching, transverse stretching, pulling and winding. In related technologies, due to the limitations of process characteristics, the longitudinal shrinkage rate of the finished polyester film will be relatively large, which will cause the product to shrink and deform significantly during preheating in subsequent processes or actual use. For example, in coated products or multi-layer composite products, problems such as warping and degumming will occur. Therefore, how to reduce the longitudinal shrinkage rate of polyester film is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention
[0003] The main purpose of the invention is to provide a polyester film production device, aiming to reduce the longitudinal shrinkage of the polyester film.
[0004] To achieve the above-mentioned object, the polyester film production equipment proposed in the present invention includes a horizontal stretching machine, wherein the horizontal stretching machine includes: The horizontal pulling carriage is provided with horizontal pulling space; A heating device is provided in the transverse-drawing carriage and is used to heat the transverse-drawing space so that the transverse-drawing space is formed into a preheating zone, a stretching zone and a shaping zone, wherein the shaping zone includes a first shaping section and a second shaping section located downstream of the first shaping section; a chain clamp device, provided on the transverse pulling carriage and used to realize transverse pulling and feeding of the film, the chain clamp device comprising a chain clamp and a clamp driving member drivingly connected to the chain clamp, the chain clamp being used to clamp the side edge of the film; and The first cutting device includes at least two first cutters arranged in the second shaping section. The at least two first cutters are arranged on both sides of the horizontal pulling space and are used to cut the side edges of the film to separate the middle part of the film from the chain clip.
[0005] In one embodiment, the first cutter is a disc cutter that can rotate around its own axis, and the first cutter is disposed above the film.
[0006] In one embodiment, the first trimming device further comprises a support member provided on the transverse pulling carriage, the support member is spaced below the first cutter, and a feed gap is constructed at the gap, and the film is movably passed through the feed gap.
[0007] In one embodiment, the support member includes a support seat and a support roller rotatably arranged on the support seat, the outer peripheral surface of the support roller is provided with an annular groove, and the first cutter can extend into the annular groove to cut the polyester film located in the annular groove.
[0008] In one embodiment, the first trimming device further includes a cutter driving member, and under the drive of the cutter driving member, the first cutter can extend into or out of the annular cutting groove.
[0009] In one embodiment, the first cutter is provided with a ceramic coating, and the ceramic coating at least covers the cutting edge of the first cutter.
[0010] In one embodiment, the side edge of the film cut by the first cutter is defined as a first edge material, and the horizontal stretching machine further includes a first edge material recovery device, which is used to collect the first edge material.
[0011] In one embodiment, the first edge material recovery device includes a guide roller, a recovery roller and a recovery drive. The guide roller is arranged at the outlet of the transverse pulling carriage and is located downstream of the opening and closing mechanism of the chain clamp device. The recovery roller is driven and connected to the recovery drive and is located below the guide roller. The first edge material can be wound around the recovery roller after passing around the guide roller.
[0012] In one embodiment, the horizontal stretching machine further includes an electrostatic dust removal device, which is disposed downstream of the first cutter and is used to absorb dust generated by the first cutter.
[0013] In one embodiment, the polyester film production equipment also includes a winder located downstream of the horizontal stretching machine, and the winder includes a flattening roller, a cooling roller, a pulling roller, a winding roller and a second trimming device. The flattening roller is located upstream of the cooling roller and is used to flatten the film. The cooling roller is located upstream of the pulling roller and is used to cool the film. The second trimming device includes at least two second cutters, and at least two second cutters are located on both sides of the film and are used to cut the side edges of the film. The winding roller is located downstream of the second trimming device and is used to wind up the finished film.
[0014] In one embodiment, the preset temperature of the first shaping section is greater than the preset temperature of the second shaping section, the preset temperature W1 of the first shaping section ranges from 180°C to 220°C, and the preset temperature W2 of the second shaping section ranges from 130°C to 180°C.
[0015] In one embodiment, the film is set for a time of 0.5s to 2s in the second setting section.
[0016] In one embodiment, the horizontal stretching space is further constructed with a cooling zone located downstream of the shaping zone, and the preset temperature W3 of the cooling zone ranges from 30°C to 60°C.
[0017] The technical solution of the present invention, by providing a first cutter in the second shaping section, allows the side edges of the film to be cut by the first cutter within the second shaping section, separating them from the central region (i.e., the middle portion) of the film, freeing it from the constraints of the chain clamps. Thus, when the film is freed from the constraints of the chain clamps within the second shaping section, it is able to retract to a certain degree in both the transverse and longitudinal directions and experience a certain degree of stress relaxation, allowing the molecular chains to shrink to a certain extent. This improves the dimensional stability of the polyester film and reduces the longitudinal shrinkage of the finished polyester film. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0019] Figure 1 A schematic structural diagram of an embodiment of a polyester film production device provided by the present invention; Figure 2 for Figure 1 A schematic structural diagram of the first trimming device; Figure 3 for Figure 1 Schematic diagram of the partitioning of the middle film; Figure 4 for Figure 1 Schematic diagram of the structure of the first cutter, the first edge material recovery device and the film.
[0020] Description of Figure Numbers: 100. Horizontal stretching machine; 110. Horizontal stretching carriage; 111. Horizontal stretching space; 112. Preheating zone; 113. Stretching zone; 114. First shaping section; 115. Second shaping section; 116. Cooling zone; 120. Chain clamp device; 130. First trimming device; 131. First cutter; 132. Support member; 133. Support seat; 134. Support roller; 135. Annular cutting groove; 136. First rotating shaft; 137. Second rotating shaft; 138. Mounting seat; 140. First edge material recovery device; 141. Guide roller; 142. Recovery roller; 200. Polyester film; 201. Product middle area; 202. First edge material area; 203. Second edge material area.
[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION
[0022] 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 any creative efforts shall fall within the scope of protection of the present invention.
[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0025] Polyester film, also known as PET film, is a transparent plastic film made of polyethylene terephthalate (PET), which is usually made by a biaxial stretching process. The process flow of biaxial stretching usually includes: raw material mixing, drying, extrusion, sheet casting, longitudinal stretching, transverse stretching, pulling and winding. In the related art, due to the limitations of process characteristics, during the preparation of the film, there is no opportunity for a certain amount of shrinkage in the longitudinal direction, resulting in a large longitudinal shrinkage rate of the finished polyester film. This will cause the product to shrink and deform significantly during preheating in subsequent processes or actual use. For example, warping, degumming and other problems may occur in coated products or multi-layer composite products. Therefore, how to reduce the longitudinal shrinkage rate of polyester film is a technical problem that those skilled in the art urgently need to solve.
[0026] To address this technical issue, one approach could be to unroll the finished polyester film again and bake it in an oven to relax and retract it longitudinally, thereby reducing the longitudinal shrinkage of the plastic film. However, this solution, due to the secondary baking, increases production costs, reduces efficiency, and is less economical.
[0027] In view of this, the present invention provides a polyester film production device.
[0028] See also Figures 1 to 4 In one embodiment of the present invention, the polyester film 200 production equipment is a horizontal stretching machine 100, and the horizontal stretching machine 100 includes a horizontal stretching box 110, a heating device (not shown in the drawings) and a chain clamp device 120. The horizontal stretching box 110 is provided with a horizontal stretching space 111. The heating device is provided in the horizontal stretching box and is used to heat the horizontal stretching space 111 so that the horizontal stretching space 111 is constructed with a preheating zone 112, a stretching zone 113 and a shaping zone. The chain clamp device 120 is provided in the horizontal stretching box and is used to realize horizontal stretching and feeding of the film. The chain clamp device 120 includes a chain clamp and a clamp driving member that drives the chain clamp. The chain clamp is used to clamp the side edge of the film.
[0029] Specifically, after the film is longitudinally stretched by the upstream longitudinal stretching machine, it enters the transverse stretching machine 100. The chain clamp enters a closed state to clamp the film, then conveys the film in the feed direction while simultaneously moving in the transverse direction to achieve transverse stretching of the film. The film is continuously clamped by the chain clamp in the transverse stretching space 111 until the chain clamp switches to an open state at the outlet of the transverse stretching machine 100, at which point the chain clamp releases its grip on the edge of the film.
[0030] It should be noted that the feeding direction refers to the forward direction of the film during the production process. Specifically for the horizontal stretching machine 100, the feeding direction refers to the direction from the feeding port toward the discharging port of the horizontal stretching machine 100.
[0031] See also Figure 1 and Figure 4 Optionally, the transverse stretching machine 100 further includes a first trimming device 130, which includes at least two first cutters 131 located in the second shaping section 115. The at least two first cutters 131 are located on either side of the transverse stretching space 111 and are used to cut the side edges of the film to separate the middle portion of the film from the chain clamp. The polyester film 200 production equipment further includes a control module, to which the first trimming device 130, the heating device, and the chain clamp device 120 are electrically connected, enabling closed-loop control and automated adjustment of the production line. The user can also use the control module to manually adjust the operating parameters of each device.
[0032] Specifically, when the film enters the shaping zone, it is first held by the chain clamps in the first shaping section 114. Then, in the second shaping section 115, its side edges are cut by the first cutter 131, freeing the film's central region (i.e., the middle portion) from the constraints of the chain clamps. Thus, when the film is no longer constrained by the chain clamps in the second shaping section 115, it is able to retract to a certain degree in both the transverse and longitudinal directions, and experience a degree of stress relaxation, allowing the molecular chains to contract. This improves the film's dimensional stability and reduces the longitudinal shrinkage of the finished film.
[0033] After the side edge of the film is cut by the first cutter 131, it remains clamped by the chain clamp until the chain clamp moves to the discharge port of the horizontal stretching machine 100 and switches to the open clamping state, at which point the side edge of the film can fall freely. The side edge of the film cut by the first cutter 131 is defined as the first edge material. The outer end of the first edge material is the free end, and the inner end of the first edge material remains connected to the middle area of the film. The inner end of the first edge material is not completely separated from the middle area of the film until the entire film at the upstream production site has been cut by the first cutter 131.
[0034] Optionally, the polyester film 200 production equipment further includes a winder (not shown in the accompanying drawings) located downstream of the horizontal stretching machine 100. The winder includes a flattening roller, a cooling roller, a pulling roller, a thickness gauge, a winding roller, and a second trimming device. The flattening roller is located upstream of the cooling roller and is used to flatten the film. The cooling roller is located upstream of the pulling roller and is used to cool the film. The thickness gauge is used to measure the thickness of the film. The second trimming device includes at least two second cutters, each located on either side of the film and used to cut the side edges of the film. The winding roller is located downstream of the second trimming device and is used to wind up the finished film. That is, in this embodiment, the first cutter 131 and the second cutter are respectively provided on the horizontal stretching machine 100 and the winder, so as to perform two trimming operations on the film, resulting in the finished film that is ultimately wound up on the winding roller.
[0035] Optionally, the second cutter is a straight cutter and is relatively fixedly mounted on the frame of the winder. The relevant technology is relatively mature, so it will not be described in detail. Secondly, the horizontal pulling box 110, the heating device, the chain clamp device 120 and the winder can all refer to mature existing technologies, so they will not be described in detail here. Figure 1 Only the part of the clamp head of the chain clamp located in the horizontal pulling space 111 is shown.
[0036] Specifically, see Figure 3After passing through the stretching zone 113, the film can be divided into a product middle zone 201, two first side material zones 202, and two second side material zones 203 in the transverse direction. The two first side material zones 202 are located on opposite sides of the product middle zone 201, and the two second side material zones 203 are located on opposite sides of the product middle zone 201. The second side material zones 203 are connected between the first side material zones 202 and the product middle zone 201. The first cutter 131 corresponds to cutting the boundary between the first side material zone 202 and the second side material zone 203, and the second cutter corresponds to cutting the boundary between the second side material zone 203 and the product middle zone 201. The first side material zone 202 separated from the second side material zone 203 after being cut by the first cutter 131 is the first side material, and the second side material zone 203 separated from the product middle zone 201 after being cut by the second cutter is the second side material. Before the film is cut by the first cutter 131, its lateral width is the sum of the widths of the product middle area 201, the two first side material areas 202 and the two second side material areas 203; after the film is cut by the first cutter 131, its lateral width is the sum of the widths of the product middle area 201 and the two second side material areas 203, and continues to move forward. After being cut by the second cutter, its lateral width is the width of the product middle area 201, that is, the width of the finished film is the width of the product middle area 201.
[0037] It should be noted that the aforementioned film regional divisions are merely conceptual definitions to facilitate understanding of the solution and do not constitute structural characteristics of the film itself. Specifically, the present embodiment utilizes a first cutter 131 and a second cutter to perform two trimming operations on the film, one at the horizontal stretcher 100 and the other at the winder, to produce the finished film that is ultimately wound onto the winder.
[0038] In this way, even if the first cutter 131 has a process defect in the cutting operation of the film (such as cut melting, cut burrs, etc.), since the process defect is located on the second edge material area 203 of the film and will be separated from the product middle area 201 as the second cutter cuts, the process defect will not remain on the finished film.
[0039] Of course, the operating parameters of the first cutter 131 can be adjusted to reduce the probability of process defects, or even avoid them. For example, the preset temperature of the second shaping section 115 can be set lower than the preset temperature of the first shaping section 114. Specifically, the preset temperature W2 of the second shaping section 115 ranges from 130°C to 180°C, for example, W2 takes values of 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, or 180°C. In this way, by ensuring that the temperature of the second shaping section 115 is no higher than the melting point of the polyester film, process defects such as melt adhesion or burrs at the incision of the first cutter 131 can be avoided. Moreover, when the temperature of the second shaping section 115 is low, it can prevent the blade of the first cutter 131 from wearing too quickly due to excessive temperature. Of course, in other embodiments, the preset temperature W2 of the second shaping section 115 may also be in other value ranges, for example, 80° C. to 130° C.
[0040] For another example, the risk of process defects at the cutting edge can be reduced by optimizing the structural parameters of the first cutter 131. For example, the first cutter 131 can be provided with a ceramic coating that covers at least the cutting edge of the first cutter 131. The ceramic coating can be made of AlCrN. The high-hardness ceramic coating improves the heat resistance of the cutting edge, prevents metal adhesion, and reduces the friction coefficient. Of course, in other embodiments, a polycrystalline diamond cutting edge can also be provided on the first cutter 131 to inhibit molecular chain breakage in the polyester film 200.
[0041] For another example, the shaping time of the film in the second shaping section 115 can be set to 0.5s to 2s, for example, a value of 0.5s, 1s, 1.5s or 2s. Of course, in other embodiments, the shaping time can also be other value ranges. Among them, the shaping time of the entire shaping area can be 4s to 8s, for example, a value of 4s, 5s, 6s, 7s or 8s. That is, the second shaping section 115 acts as a buffer zone. In particular, in an embodiment where the horizontal pulling space 111 also has a cooling zone 116, the second shaping section 115 is located between the first shaping section 114 and the cooling zone 116, which can play a better temperature change buffering effect.
[0042] Optionally, the preset temperature W1 of the first shaping section 114 is in a range of 180° C. to 220° C., for example, W1 is 180° C., 185° C., 190° C., 195° C., 200° C., 205° C., 210° C., 215° C., or 220° C. Of course, in other embodiments, the preset temperature W1 of the first shaping section 114 may also be in other ranges.
[0043] Optionally, the horizontal stretching space 111 is further configured with a cooling zone 116 located downstream of the shaping zone, and a preset temperature W3 of the cooling zone 116 ranges from 30° C. to 60° C. Of course, in other embodiments, the cooling zone 116 may not be provided.
[0044] Optionally, cooling zone 116 is equipped with an air cooling device (not shown in the accompanying drawings). The air cooling device includes an air nozzle, an air duct, and an air pump. The air nozzle is located below the film. The airflow generated by the air pump flows through the air duct to the air nozzle and is blown toward the lower surface of the film. In this way, the upward airflow not only cools the film but also provides support, i.e., it lifts the film upward. It will be understood that at this point, the film is no longer clamped and supported by the chain clamps on both sides. Therefore, it is equivalent to floating in mid-air within cooling zone 116. At this time, the airflow blown through the air nozzle can better keep the film aloft.
[0045] Optionally, the air nozzle is configured as a slit air nozzle extending in the transverse direction, and a plurality of air nozzles are provided, and the plurality of air nozzles are spaced apart in the longitudinal direction. In this way, the air curtain blown out by the slit air nozzle can exert a more uniform blowing force on the film.
[0046] See also Figure 2 and Figure 4 Optionally, the first cutter 131 is a circular cutter (i.e., an annular cutter) capable of rotating about its own axis, and is positioned above the film. This arrangement allows the outer periphery of the first cutter 131 to have cutting edges, which can sequentially engage and cut the film, thereby preventing localized heating of the cutting edges and the risk of damage. Of course, in other embodiments, the first cutter 131 can also have other configurations, such as a straight or curved blade.
[0047] The first cutter 131 can rotate either passively or actively. For example, in this embodiment, the first cutter 131 rotates passively, driven by the forward movement of the film. In another embodiment, active rotation is also possible. Specifically, the first trimming device 130 further includes a rolling drive, which drives the first cutter 131 to rotate in the feed direction (i.e., the linear velocity of the point of contact with the film is in the same direction as the feed speed), and the linear velocity of the first cutter 131 at the point of contact is greater than or equal to the feed speed.
[0048] See also Figure 2Optionally, the first trimming device 130 further includes a support member 132 disposed on the transversely-stretched carriage 110. The support member 132 is spaced below the first cutter 131 and defines a feed gap at the gap, through which the film flexibly passes. In this manner, the support member 132 supports the film, thereby enhancing the smoothness and stability of the film when being cut by the first cutter 131. Of course, in other embodiments, the support member 132 may be omitted.
[0049] In this embodiment, the first cutter 131 rotates passively. When the film passes through the feed gap, the linear speed of the cutting point of the first cutter 131 is equal to the forward speed of the film, that is, there is no speed difference between the first cutter 131 and the film, making it difficult for process defects such as wrinkles to occur at the incision, so the cutting effect is good.
[0050] See also Figure 2 Optionally, the support member 132 includes a support seat 133 and a support roller 134 rotatably mounted on the support seat 133. The outer circumferential surface of the support roller 134 is provided with an annular groove 135. The first cutter 131 can extend into the annular groove 135 to cut the polyester film 200 located within the annular groove 135. Specifically, the outer circumferential surface of the support roller 134 (including the outer edge of the notch of the annular groove 135) can support the film. The annular groove 135 cooperates with the first cutter 131 to cut the side edge of the film. This structure is simple and easy to implement. Furthermore, since the support roller 134 is rotatable, it can also rotate with the forward movement of the film, thereby preventing dynamic friction between the film and the support roller 134, which could cause wrinkles and deformation of the film or wear of the support roller 134. Of course, in other embodiments, the support roller 134 may not be provided, and the support seat 133 may be provided with grooves penetrating the opposite end surfaces thereof, and the first cutting knife 131 may be inserted into the grooves.
[0051] Optionally, the cross-sectional shape of the annular groove 135 is adapted to the cross-sectional shape of the blade of the first cutter 131 . For example, the cross-sectional shape of the annular groove 135 is V-shaped, which can enhance the coordination between the first cutter 131 and the annular groove 135 .
[0052] Optionally, the first trimming device 130 further includes a cutter drive (not shown in the drawings). Driven by the cutter drive, the first cutter 131 can be inserted into or removed from the annular groove 135. Specifically, at the beginning of film production, the first cutter 131 is driven to a preparatory position, where it is removed from the annular groove 135. This allows the free end of the film to pass through the gap between the first cutter 131 and the support roller 134 and onto the take-up roller. The first cutter 131 is then driven to a cutting position, where it is inserted into the annular groove 135, allowing it to cut the side edge of the film within the annular groove 135, thereby commencing the actual film production process.
[0053] The first cutter 131 can move in various ways, such as rotation or translation. In this embodiment, the cutter drive member is configured as a linear motor or a ball screw mechanism to drive the first cutter 131 to move in a vertical translation direction.
[0054] See also Figure 2 Optionally, the first cutter 131 device also includes a first rotating shaft 136, a second rotating shaft 137 and a mounting seat 138. The first cutter 131 is rotatably mounted on the mounting seat 138 through the first rotating shaft 136. The mounting seat 138 is movably connected to the horizontal pulling box 110 and can be driven by the cutter driving member to move horizontally; the support roller 134 is rotatably mounted on the support seat 133 through the second rotating shaft 137.
[0055] See also Figure 1 and Figure 4 Optionally, the first scrap can be recycled. Specifically, the side edge of the film cut by the first cutter 131 is defined as the first scrap. The horizontal stretching machine 100 also includes a first scrap recovery device 140 for collecting the first scrap. In this way, the first scrap can be orderly recovered for other uses, achieving the goal of energy conservation and emission reduction. Of course, in other embodiments, the first scrap recovery device 140 may not be provided.
[0056] See also Figure 1 and Figure 4 The first scrap recovery device 140 includes a guide roller 141, a recovery roller 142, and a recovery drive. The guide roller 141 is located at the exit of the cross-pull carriage 110 and is located downstream of the opening mechanism of the chain clamp device 120. The recovery roller 142 is driven by the recovery drive and is located below the guide roller 141. After passing around the guide roller 141, the first scrap can be wound around the recovery roller 142. This structure is simple and easy to implement.
[0057] Optionally, the polyester film 200 production equipment further includes a second scrap recovery device for recovering the second scrap. The structure of the second scrap recovery device may refer to the first scrap recovery device 140 or a mature prior art.
[0058] Under high temperatures, the molecular chain mobility of the polyester film 200 increases. The shear force of the first cutter 131 during rotary cutting may cause local molecular chain breakage in the polyester film 200, generating oligomer fragments, also known as dust. To address the dust problem, the horizontal stretching machine 100 optionally includes an electrostatic precipitator (not shown in the figures). The electrostatic precipitator is located downstream of the first cutter 131 and is used to absorb the dust generated by the first cutter 131. It will be appreciated that in embodiments where both the sizing zone and the cooling zone 116 are heated and cooled by airflow, the airflow directed toward the film can lift the dust, which is then captured by the electrostatic precipitator. This allows the electrostatic precipitator to promptly remove the dust, preventing defects in subsequent production processes (such as coating or multi-layer lamination) caused by the presence of dust in the finished film. Since the technology related to electrostatic precipitators is relatively mature, it will not be discussed in detail here. Of course, in other embodiments, other methods can be used to remove the dust, including but not limited to the use of filters in the cooling zone 116.
[0059] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A polyester film production equipment, including a horizontal stretching machine, characterized in that: The horizontal stretching machine comprises: The horizontal pulling carriage is provided with horizontal pulling space; A heating device is provided in the transverse-drawing carriage and is used to heat the transverse-drawing space so that the transverse-drawing space is formed into a preheating zone, a stretching zone and a shaping zone, wherein the shaping zone includes a first shaping section and a second shaping section located downstream of the first shaping section; a chain clamp device, provided on the transverse pulling carriage and used to realize transverse pulling and feeding of the film, the chain clamp device comprising a chain clamp and a clamp driving member drivingly connected to the chain clamp, the chain clamp being used to clamp the side edge of the film; and The first cutting device includes at least two first cutters arranged in the second shaping section. The at least two first cutters are arranged on both sides of the horizontal pulling space and are used to cut the side edges of the film to separate the middle part of the film from the chain clip.
2. The polyester film production equipment according to claim 1, characterized in that The first cutter is a disc cutter and can rotate around its own axis. The first cutter is arranged above the film.
3. The polyester film production equipment according to claim 2, characterized in that The first trimming device further comprises a support member provided on the transverse pulling carriage, the support member being spaced below the first cutter and forming a feeding gap at the space, and the film being movably passed through the feeding gap.
4. The polyester film production equipment according to claim 3, characterized in that The support member includes a support seat and a support roller rotatably arranged on the support seat. The outer peripheral surface of the support roller is provided with an annular groove. The first cutter can extend into the annular groove to cut the polyester film located in the annular groove.
5. The polyester film production equipment according to claim 4, characterized in that The first trimming device further includes a cutter driving member, and under the drive of the cutter driving member, the first cutter can extend into or out of the annular cutting groove; And / or, the first cutter is provided with a ceramic coating, and the ceramic coating at least covers the blade of the first cutter.
6. The polyester film production equipment according to claim 1, wherein: The side edge of the film cut by the first cutter is defined as a first edge material, and the horizontal stretching machine further includes a first edge material recovery device, which is used to collect the first edge material.
7. The polyester film production equipment according to claim 6, characterized in that The first edge material recovery device includes a guide roller, a recovery roller and a recovery drive. The guide roller is arranged at the exit of the transverse pulling carriage and is located downstream of the opening and clamping mechanism of the chain clamp device. The recovery roller is driven and connected to the recovery drive and is located below the guide roller. The first edge material can be wound around the recovery roller after bypassing the guide roller.
8. The polyester film production equipment according to claim 1, wherein The horizontal stretching machine further includes an electrostatic dust removal device, which is disposed downstream of the first cutter and is used to absorb dust generated from the first cutter.
9. The polyester film production equipment according to claim 1, wherein: The polyester film production equipment also includes a winder located downstream of the horizontal stretching machine, and the winder includes a flattening roller, a cooling roller, a pulling roller, a winding roller and a second trimming device. The flattening roller is located upstream of the cooling roller and is used to flatten the film. The cooling roller is located upstream of the pulling roller and is used to cool the film. The second trimming device includes at least two second cutters, and at least two second cutters are located on both sides of the film and are used to cut the side edges of the film. The winding roller is located downstream of the second trimming device and is used to wind up the finished film.
10. The polyester film production equipment according to claim 1, wherein The preset temperature of the first shaping section is greater than the preset temperature of the second shaping section, the preset temperature of the first shaping section ranges from 180°C to 220°C, and the preset temperature of the second shaping section ranges from 130°C to 180°C; And / or, the film is set for a time of 0.5s to 2s in the second setting section; And / or, the horizontal stretching space is further constructed with a cooling zone located downstream of the shaping zone, and the preset temperature of the cooling zone ranges from 30°C to 60°C.